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6169 lines
178 KiB
6169 lines
178 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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drbd_receiver.c |
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|
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
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|
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
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Copyright (C) 1999-2008, Philipp Reisner <[email protected]>. |
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Copyright (C) 2002-2008, Lars Ellenberg <[email protected]>. |
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*/ |
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#include <linux/module.h> |
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|
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#include <linux/uaccess.h> |
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#include <net/sock.h> |
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|
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#include <linux/drbd.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/in.h> |
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#include <linux/mm.h> |
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#include <linux/memcontrol.h> |
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#include <linux/mm_inline.h> |
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#include <linux/slab.h> |
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#include <uapi/linux/sched/types.h> |
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#include <linux/sched/signal.h> |
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#include <linux/pkt_sched.h> |
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#define __KERNEL_SYSCALLS__ |
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#include <linux/unistd.h> |
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#include <linux/vmalloc.h> |
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#include <linux/random.h> |
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#include <linux/string.h> |
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#include <linux/scatterlist.h> |
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#include <linux/part_stat.h> |
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#include "drbd_int.h" |
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#include "drbd_protocol.h" |
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#include "drbd_req.h" |
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#include "drbd_vli.h" |
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|
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#define PRO_FEATURES (DRBD_FF_TRIM|DRBD_FF_THIN_RESYNC|DRBD_FF_WSAME|DRBD_FF_WZEROES) |
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struct packet_info { |
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enum drbd_packet cmd; |
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unsigned int size; |
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unsigned int vnr; |
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void *data; |
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}; |
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enum finish_epoch { |
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FE_STILL_LIVE, |
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FE_DESTROYED, |
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FE_RECYCLED, |
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}; |
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static int drbd_do_features(struct drbd_connection *connection); |
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static int drbd_do_auth(struct drbd_connection *connection); |
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static int drbd_disconnected(struct drbd_peer_device *); |
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static void conn_wait_active_ee_empty(struct drbd_connection *connection); |
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static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *, struct drbd_epoch *, enum epoch_event); |
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static int e_end_block(struct drbd_work *, int); |
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#define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) |
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|
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/* |
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* some helper functions to deal with single linked page lists, |
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* page->private being our "next" pointer. |
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*/ |
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/* If at least n pages are linked at head, get n pages off. |
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* Otherwise, don't modify head, and return NULL. |
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* Locking is the responsibility of the caller. |
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*/ |
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static struct page *page_chain_del(struct page **head, int n) |
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{ |
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struct page *page; |
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struct page *tmp; |
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BUG_ON(!n); |
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BUG_ON(!head); |
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page = *head; |
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if (!page) |
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return NULL; |
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while (page) { |
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tmp = page_chain_next(page); |
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if (--n == 0) |
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break; /* found sufficient pages */ |
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if (tmp == NULL) |
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/* insufficient pages, don't use any of them. */ |
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return NULL; |
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page = tmp; |
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} |
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/* add end of list marker for the returned list */ |
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set_page_private(page, 0); |
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/* actual return value, and adjustment of head */ |
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page = *head; |
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*head = tmp; |
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return page; |
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} |
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|
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/* may be used outside of locks to find the tail of a (usually short) |
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* "private" page chain, before adding it back to a global chain head |
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* with page_chain_add() under a spinlock. */ |
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static struct page *page_chain_tail(struct page *page, int *len) |
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{ |
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struct page *tmp; |
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int i = 1; |
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while ((tmp = page_chain_next(page))) { |
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++i; |
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page = tmp; |
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} |
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if (len) |
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*len = i; |
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return page; |
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} |
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|
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static int page_chain_free(struct page *page) |
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{ |
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struct page *tmp; |
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int i = 0; |
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page_chain_for_each_safe(page, tmp) { |
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put_page(page); |
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++i; |
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} |
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return i; |
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} |
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|
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static void page_chain_add(struct page **head, |
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struct page *chain_first, struct page *chain_last) |
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{ |
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#if 1 |
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struct page *tmp; |
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tmp = page_chain_tail(chain_first, NULL); |
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BUG_ON(tmp != chain_last); |
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#endif |
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|
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/* add chain to head */ |
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set_page_private(chain_last, (unsigned long)*head); |
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*head = chain_first; |
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} |
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static struct page *__drbd_alloc_pages(struct drbd_device *device, |
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unsigned int number) |
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{ |
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struct page *page = NULL; |
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struct page *tmp = NULL; |
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unsigned int i = 0; |
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|
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/* Yes, testing drbd_pp_vacant outside the lock is racy. |
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* So what. It saves a spin_lock. */ |
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if (drbd_pp_vacant >= number) { |
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spin_lock(&drbd_pp_lock); |
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page = page_chain_del(&drbd_pp_pool, number); |
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if (page) |
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drbd_pp_vacant -= number; |
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spin_unlock(&drbd_pp_lock); |
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if (page) |
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return page; |
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} |
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|
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/* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
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* "criss-cross" setup, that might cause write-out on some other DRBD, |
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* which in turn might block on the other node at this very place. */ |
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for (i = 0; i < number; i++) { |
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tmp = alloc_page(GFP_TRY); |
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if (!tmp) |
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break; |
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set_page_private(tmp, (unsigned long)page); |
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page = tmp; |
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} |
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if (i == number) |
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return page; |
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|
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/* Not enough pages immediately available this time. |
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* No need to jump around here, drbd_alloc_pages will retry this |
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* function "soon". */ |
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if (page) { |
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tmp = page_chain_tail(page, NULL); |
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spin_lock(&drbd_pp_lock); |
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page_chain_add(&drbd_pp_pool, page, tmp); |
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drbd_pp_vacant += i; |
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spin_unlock(&drbd_pp_lock); |
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} |
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return NULL; |
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} |
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static void reclaim_finished_net_peer_reqs(struct drbd_device *device, |
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struct list_head *to_be_freed) |
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{ |
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struct drbd_peer_request *peer_req, *tmp; |
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|
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/* The EEs are always appended to the end of the list. Since |
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they are sent in order over the wire, they have to finish |
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in order. As soon as we see the first not finished we can |
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stop to examine the list... */ |
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list_for_each_entry_safe(peer_req, tmp, &device->net_ee, w.list) { |
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if (drbd_peer_req_has_active_page(peer_req)) |
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break; |
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list_move(&peer_req->w.list, to_be_freed); |
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} |
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} |
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static void drbd_reclaim_net_peer_reqs(struct drbd_device *device) |
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{ |
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LIST_HEAD(reclaimed); |
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struct drbd_peer_request *peer_req, *t; |
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|
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spin_lock_irq(&device->resource->req_lock); |
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reclaim_finished_net_peer_reqs(device, &reclaimed); |
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spin_unlock_irq(&device->resource->req_lock); |
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list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
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drbd_free_net_peer_req(device, peer_req); |
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} |
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static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection) |
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{ |
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struct drbd_peer_device *peer_device; |
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int vnr; |
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|
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rcu_read_lock(); |
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idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
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struct drbd_device *device = peer_device->device; |
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if (!atomic_read(&device->pp_in_use_by_net)) |
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continue; |
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kref_get(&device->kref); |
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rcu_read_unlock(); |
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drbd_reclaim_net_peer_reqs(device); |
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kref_put(&device->kref, drbd_destroy_device); |
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rcu_read_lock(); |
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} |
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rcu_read_unlock(); |
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} |
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/** |
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* drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) |
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* @peer_device: DRBD device. |
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* @number: number of pages requested |
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* @retry: whether to retry, if not enough pages are available right now |
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* |
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* Tries to allocate number pages, first from our own page pool, then from |
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* the kernel. |
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* Possibly retry until DRBD frees sufficient pages somewhere else. |
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* |
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* If this allocation would exceed the max_buffers setting, we throttle |
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* allocation (schedule_timeout) to give the system some room to breathe. |
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* |
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* We do not use max-buffers as hard limit, because it could lead to |
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* congestion and further to a distributed deadlock during online-verify or |
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* (checksum based) resync, if the max-buffers, socket buffer sizes and |
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* resync-rate settings are mis-configured. |
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* |
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* Returns a page chain linked via page->private. |
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*/ |
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struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number, |
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bool retry) |
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{ |
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struct drbd_device *device = peer_device->device; |
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struct page *page = NULL; |
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struct net_conf *nc; |
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DEFINE_WAIT(wait); |
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unsigned int mxb; |
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rcu_read_lock(); |
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nc = rcu_dereference(peer_device->connection->net_conf); |
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mxb = nc ? nc->max_buffers : 1000000; |
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rcu_read_unlock(); |
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if (atomic_read(&device->pp_in_use) < mxb) |
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page = __drbd_alloc_pages(device, number); |
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/* Try to keep the fast path fast, but occasionally we need |
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* to reclaim the pages we lended to the network stack. */ |
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if (page && atomic_read(&device->pp_in_use_by_net) > 512) |
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drbd_reclaim_net_peer_reqs(device); |
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while (page == NULL) { |
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prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
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drbd_reclaim_net_peer_reqs(device); |
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if (atomic_read(&device->pp_in_use) < mxb) { |
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page = __drbd_alloc_pages(device, number); |
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if (page) |
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break; |
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} |
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if (!retry) |
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break; |
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if (signal_pending(current)) { |
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drbd_warn(device, "drbd_alloc_pages interrupted!\n"); |
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break; |
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} |
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if (schedule_timeout(HZ/10) == 0) |
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mxb = UINT_MAX; |
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} |
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finish_wait(&drbd_pp_wait, &wait); |
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if (page) |
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atomic_add(number, &device->pp_in_use); |
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return page; |
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} |
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|
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/* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. |
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* Is also used from inside an other spin_lock_irq(&resource->req_lock); |
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* Either links the page chain back to the global pool, |
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* or returns all pages to the system. */ |
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static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net) |
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{ |
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atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use; |
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int i; |
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|
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if (page == NULL) |
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return; |
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if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count) |
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i = page_chain_free(page); |
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else { |
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struct page *tmp; |
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tmp = page_chain_tail(page, &i); |
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spin_lock(&drbd_pp_lock); |
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page_chain_add(&drbd_pp_pool, page, tmp); |
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drbd_pp_vacant += i; |
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spin_unlock(&drbd_pp_lock); |
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} |
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i = atomic_sub_return(i, a); |
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if (i < 0) |
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drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n", |
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is_net ? "pp_in_use_by_net" : "pp_in_use", i); |
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wake_up(&drbd_pp_wait); |
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} |
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|
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/* |
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You need to hold the req_lock: |
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_drbd_wait_ee_list_empty() |
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|
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You must not have the req_lock: |
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drbd_free_peer_req() |
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drbd_alloc_peer_req() |
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drbd_free_peer_reqs() |
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drbd_ee_fix_bhs() |
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drbd_finish_peer_reqs() |
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drbd_clear_done_ee() |
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drbd_wait_ee_list_empty() |
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*/ |
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|
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/* normal: payload_size == request size (bi_size) |
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* w_same: payload_size == logical_block_size |
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* trim: payload_size == 0 */ |
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struct drbd_peer_request * |
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drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
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unsigned int request_size, unsigned int payload_size, gfp_t gfp_mask) __must_hold(local) |
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{ |
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struct drbd_device *device = peer_device->device; |
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struct drbd_peer_request *peer_req; |
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struct page *page = NULL; |
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unsigned nr_pages = (payload_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
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|
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if (drbd_insert_fault(device, DRBD_FAULT_AL_EE)) |
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return NULL; |
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|
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peer_req = mempool_alloc(&drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
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if (!peer_req) { |
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if (!(gfp_mask & __GFP_NOWARN)) |
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drbd_err(device, "%s: allocation failed\n", __func__); |
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return NULL; |
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} |
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|
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if (nr_pages) { |
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page = drbd_alloc_pages(peer_device, nr_pages, |
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gfpflags_allow_blocking(gfp_mask)); |
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if (!page) |
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goto fail; |
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} |
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|
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memset(peer_req, 0, sizeof(*peer_req)); |
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INIT_LIST_HEAD(&peer_req->w.list); |
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drbd_clear_interval(&peer_req->i); |
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peer_req->i.size = request_size; |
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peer_req->i.sector = sector; |
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peer_req->submit_jif = jiffies; |
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peer_req->peer_device = peer_device; |
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peer_req->pages = page; |
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/* |
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* The block_id is opaque to the receiver. It is not endianness |
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* converted, and sent back to the sender unchanged. |
|
*/ |
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peer_req->block_id = id; |
|
|
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return peer_req; |
|
|
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fail: |
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mempool_free(peer_req, &drbd_ee_mempool); |
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return NULL; |
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} |
|
|
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void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req, |
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int is_net) |
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{ |
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might_sleep(); |
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if (peer_req->flags & EE_HAS_DIGEST) |
|
kfree(peer_req->digest); |
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drbd_free_pages(device, peer_req->pages, is_net); |
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D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0); |
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D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
|
if (!expect(!(peer_req->flags & EE_CALL_AL_COMPLETE_IO))) { |
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peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
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drbd_al_complete_io(device, &peer_req->i); |
|
} |
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mempool_free(peer_req, &drbd_ee_mempool); |
|
} |
|
|
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int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list) |
|
{ |
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LIST_HEAD(work_list); |
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struct drbd_peer_request *peer_req, *t; |
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int count = 0; |
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int is_net = list == &device->net_ee; |
|
|
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spin_lock_irq(&device->resource->req_lock); |
|
list_splice_init(list, &work_list); |
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spin_unlock_irq(&device->resource->req_lock); |
|
|
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list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
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__drbd_free_peer_req(device, peer_req, is_net); |
|
count++; |
|
} |
|
return count; |
|
} |
|
|
|
/* |
|
* See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. |
|
*/ |
|
static int drbd_finish_peer_reqs(struct drbd_device *device) |
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{ |
|
LIST_HEAD(work_list); |
|
LIST_HEAD(reclaimed); |
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struct drbd_peer_request *peer_req, *t; |
|
int err = 0; |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
reclaim_finished_net_peer_reqs(device, &reclaimed); |
|
list_splice_init(&device->done_ee, &work_list); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
|
drbd_free_net_peer_req(device, peer_req); |
|
|
|
/* possible callbacks here: |
|
* e_end_block, and e_end_resync_block, e_send_superseded. |
|
* all ignore the last argument. |
|
*/ |
|
list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
|
int err2; |
|
|
|
/* list_del not necessary, next/prev members not touched */ |
|
err2 = peer_req->w.cb(&peer_req->w, !!err); |
|
if (!err) |
|
err = err2; |
|
drbd_free_peer_req(device, peer_req); |
|
} |
|
wake_up(&device->ee_wait); |
|
|
|
return err; |
|
} |
|
|
|
static void _drbd_wait_ee_list_empty(struct drbd_device *device, |
|
struct list_head *head) |
|
{ |
|
DEFINE_WAIT(wait); |
|
|
|
/* avoids spin_lock/unlock |
|
* and calling prepare_to_wait in the fast path */ |
|
while (!list_empty(head)) { |
|
prepare_to_wait(&device->ee_wait, &wait, TASK_UNINTERRUPTIBLE); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
io_schedule(); |
|
finish_wait(&device->ee_wait, &wait); |
|
spin_lock_irq(&device->resource->req_lock); |
|
} |
|
} |
|
|
|
static void drbd_wait_ee_list_empty(struct drbd_device *device, |
|
struct list_head *head) |
|
{ |
|
spin_lock_irq(&device->resource->req_lock); |
|
_drbd_wait_ee_list_empty(device, head); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
} |
|
|
|
static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
|
{ |
|
struct kvec iov = { |
|
.iov_base = buf, |
|
.iov_len = size, |
|
}; |
|
struct msghdr msg = { |
|
.msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) |
|
}; |
|
iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size); |
|
return sock_recvmsg(sock, &msg, msg.msg_flags); |
|
} |
|
|
|
static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size) |
|
{ |
|
int rv; |
|
|
|
rv = drbd_recv_short(connection->data.socket, buf, size, 0); |
|
|
|
if (rv < 0) { |
|
if (rv == -ECONNRESET) |
|
drbd_info(connection, "sock was reset by peer\n"); |
|
else if (rv != -ERESTARTSYS) |
|
drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
|
} else if (rv == 0) { |
|
if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
|
long t; |
|
rcu_read_lock(); |
|
t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
|
rcu_read_unlock(); |
|
|
|
t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t); |
|
|
|
if (t) |
|
goto out; |
|
} |
|
drbd_info(connection, "sock was shut down by peer\n"); |
|
} |
|
|
|
if (rv != size) |
|
conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); |
|
|
|
out: |
|
return rv; |
|
} |
|
|
|
static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size) |
|
{ |
|
int err; |
|
|
|
err = drbd_recv(connection, buf, size); |
|
if (err != size) { |
|
if (err >= 0) |
|
err = -EIO; |
|
} else |
|
err = 0; |
|
return err; |
|
} |
|
|
|
static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size) |
|
{ |
|
int err; |
|
|
|
err = drbd_recv_all(connection, buf, size); |
|
if (err && !signal_pending(current)) |
|
drbd_warn(connection, "short read (expected size %d)\n", (int)size); |
|
return err; |
|
} |
|
|
|
/* quoting tcp(7): |
|
* On individual connections, the socket buffer size must be set prior to the |
|
* listen(2) or connect(2) calls in order to have it take effect. |
|
* This is our wrapper to do so. |
|
*/ |
|
static void drbd_setbufsize(struct socket *sock, unsigned int snd, |
|
unsigned int rcv) |
|
{ |
|
/* open coded SO_SNDBUF, SO_RCVBUF */ |
|
if (snd) { |
|
sock->sk->sk_sndbuf = snd; |
|
sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
|
} |
|
if (rcv) { |
|
sock->sk->sk_rcvbuf = rcv; |
|
sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
|
} |
|
} |
|
|
|
static struct socket *drbd_try_connect(struct drbd_connection *connection) |
|
{ |
|
const char *what; |
|
struct socket *sock; |
|
struct sockaddr_in6 src_in6; |
|
struct sockaddr_in6 peer_in6; |
|
struct net_conf *nc; |
|
int err, peer_addr_len, my_addr_len; |
|
int sndbuf_size, rcvbuf_size, connect_int; |
|
int disconnect_on_error = 1; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
if (!nc) { |
|
rcu_read_unlock(); |
|
return NULL; |
|
} |
|
sndbuf_size = nc->sndbuf_size; |
|
rcvbuf_size = nc->rcvbuf_size; |
|
connect_int = nc->connect_int; |
|
rcu_read_unlock(); |
|
|
|
my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6)); |
|
memcpy(&src_in6, &connection->my_addr, my_addr_len); |
|
|
|
if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6) |
|
src_in6.sin6_port = 0; |
|
else |
|
((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ |
|
|
|
peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6)); |
|
memcpy(&peer_in6, &connection->peer_addr, peer_addr_len); |
|
|
|
what = "sock_create_kern"; |
|
err = sock_create_kern(&init_net, ((struct sockaddr *)&src_in6)->sa_family, |
|
SOCK_STREAM, IPPROTO_TCP, &sock); |
|
if (err < 0) { |
|
sock = NULL; |
|
goto out; |
|
} |
|
|
|
sock->sk->sk_rcvtimeo = |
|
sock->sk->sk_sndtimeo = connect_int * HZ; |
|
drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); |
|
|
|
/* explicitly bind to the configured IP as source IP |
|
* for the outgoing connections. |
|
* This is needed for multihomed hosts and to be |
|
* able to use lo: interfaces for drbd. |
|
* Make sure to use 0 as port number, so linux selects |
|
* a free one dynamically. |
|
*/ |
|
what = "bind before connect"; |
|
err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
|
if (err < 0) |
|
goto out; |
|
|
|
/* connect may fail, peer not yet available. |
|
* stay C_WF_CONNECTION, don't go Disconnecting! */ |
|
disconnect_on_error = 0; |
|
what = "connect"; |
|
err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
|
|
|
out: |
|
if (err < 0) { |
|
if (sock) { |
|
sock_release(sock); |
|
sock = NULL; |
|
} |
|
switch (-err) { |
|
/* timeout, busy, signal pending */ |
|
case ETIMEDOUT: case EAGAIN: case EINPROGRESS: |
|
case EINTR: case ERESTARTSYS: |
|
/* peer not (yet) available, network problem */ |
|
case ECONNREFUSED: case ENETUNREACH: |
|
case EHOSTDOWN: case EHOSTUNREACH: |
|
disconnect_on_error = 0; |
|
break; |
|
default: |
|
drbd_err(connection, "%s failed, err = %d\n", what, err); |
|
} |
|
if (disconnect_on_error) |
|
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
} |
|
|
|
return sock; |
|
} |
|
|
|
struct accept_wait_data { |
|
struct drbd_connection *connection; |
|
struct socket *s_listen; |
|
struct completion door_bell; |
|
void (*original_sk_state_change)(struct sock *sk); |
|
|
|
}; |
|
|
|
static void drbd_incoming_connection(struct sock *sk) |
|
{ |
|
struct accept_wait_data *ad = sk->sk_user_data; |
|
void (*state_change)(struct sock *sk); |
|
|
|
state_change = ad->original_sk_state_change; |
|
if (sk->sk_state == TCP_ESTABLISHED) |
|
complete(&ad->door_bell); |
|
state_change(sk); |
|
} |
|
|
|
static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad) |
|
{ |
|
int err, sndbuf_size, rcvbuf_size, my_addr_len; |
|
struct sockaddr_in6 my_addr; |
|
struct socket *s_listen; |
|
struct net_conf *nc; |
|
const char *what; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
if (!nc) { |
|
rcu_read_unlock(); |
|
return -EIO; |
|
} |
|
sndbuf_size = nc->sndbuf_size; |
|
rcvbuf_size = nc->rcvbuf_size; |
|
rcu_read_unlock(); |
|
|
|
my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6)); |
|
memcpy(&my_addr, &connection->my_addr, my_addr_len); |
|
|
|
what = "sock_create_kern"; |
|
err = sock_create_kern(&init_net, ((struct sockaddr *)&my_addr)->sa_family, |
|
SOCK_STREAM, IPPROTO_TCP, &s_listen); |
|
if (err) { |
|
s_listen = NULL; |
|
goto out; |
|
} |
|
|
|
s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
|
drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
|
|
|
what = "bind before listen"; |
|
err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
|
if (err < 0) |
|
goto out; |
|
|
|
ad->s_listen = s_listen; |
|
write_lock_bh(&s_listen->sk->sk_callback_lock); |
|
ad->original_sk_state_change = s_listen->sk->sk_state_change; |
|
s_listen->sk->sk_state_change = drbd_incoming_connection; |
|
s_listen->sk->sk_user_data = ad; |
|
write_unlock_bh(&s_listen->sk->sk_callback_lock); |
|
|
|
what = "listen"; |
|
err = s_listen->ops->listen(s_listen, 5); |
|
if (err < 0) |
|
goto out; |
|
|
|
return 0; |
|
out: |
|
if (s_listen) |
|
sock_release(s_listen); |
|
if (err < 0) { |
|
if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { |
|
drbd_err(connection, "%s failed, err = %d\n", what, err); |
|
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
} |
|
} |
|
|
|
return -EIO; |
|
} |
|
|
|
static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad) |
|
{ |
|
write_lock_bh(&sk->sk_callback_lock); |
|
sk->sk_state_change = ad->original_sk_state_change; |
|
sk->sk_user_data = NULL; |
|
write_unlock_bh(&sk->sk_callback_lock); |
|
} |
|
|
|
static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad) |
|
{ |
|
int timeo, connect_int, err = 0; |
|
struct socket *s_estab = NULL; |
|
struct net_conf *nc; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
if (!nc) { |
|
rcu_read_unlock(); |
|
return NULL; |
|
} |
|
connect_int = nc->connect_int; |
|
rcu_read_unlock(); |
|
|
|
timeo = connect_int * HZ; |
|
/* 28.5% random jitter */ |
|
timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7; |
|
|
|
err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo); |
|
if (err <= 0) |
|
return NULL; |
|
|
|
err = kernel_accept(ad->s_listen, &s_estab, 0); |
|
if (err < 0) { |
|
if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { |
|
drbd_err(connection, "accept failed, err = %d\n", err); |
|
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
} |
|
} |
|
|
|
if (s_estab) |
|
unregister_state_change(s_estab->sk, ad); |
|
|
|
return s_estab; |
|
} |
|
|
|
static int decode_header(struct drbd_connection *, void *, struct packet_info *); |
|
|
|
static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock, |
|
enum drbd_packet cmd) |
|
{ |
|
if (!conn_prepare_command(connection, sock)) |
|
return -EIO; |
|
return conn_send_command(connection, sock, cmd, 0, NULL, 0); |
|
} |
|
|
|
static int receive_first_packet(struct drbd_connection *connection, struct socket *sock) |
|
{ |
|
unsigned int header_size = drbd_header_size(connection); |
|
struct packet_info pi; |
|
struct net_conf *nc; |
|
int err; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
if (!nc) { |
|
rcu_read_unlock(); |
|
return -EIO; |
|
} |
|
sock->sk->sk_rcvtimeo = nc->ping_timeo * 4 * HZ / 10; |
|
rcu_read_unlock(); |
|
|
|
err = drbd_recv_short(sock, connection->data.rbuf, header_size, 0); |
|
if (err != header_size) { |
|
if (err >= 0) |
|
err = -EIO; |
|
return err; |
|
} |
|
err = decode_header(connection, connection->data.rbuf, &pi); |
|
if (err) |
|
return err; |
|
return pi.cmd; |
|
} |
|
|
|
/** |
|
* drbd_socket_okay() - Free the socket if its connection is not okay |
|
* @sock: pointer to the pointer to the socket. |
|
*/ |
|
static bool drbd_socket_okay(struct socket **sock) |
|
{ |
|
int rr; |
|
char tb[4]; |
|
|
|
if (!*sock) |
|
return false; |
|
|
|
rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
|
|
|
if (rr > 0 || rr == -EAGAIN) { |
|
return true; |
|
} else { |
|
sock_release(*sock); |
|
*sock = NULL; |
|
return false; |
|
} |
|
} |
|
|
|
static bool connection_established(struct drbd_connection *connection, |
|
struct socket **sock1, |
|
struct socket **sock2) |
|
{ |
|
struct net_conf *nc; |
|
int timeout; |
|
bool ok; |
|
|
|
if (!*sock1 || !*sock2) |
|
return false; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10; |
|
rcu_read_unlock(); |
|
schedule_timeout_interruptible(timeout); |
|
|
|
ok = drbd_socket_okay(sock1); |
|
ok = drbd_socket_okay(sock2) && ok; |
|
|
|
return ok; |
|
} |
|
|
|
/* Gets called if a connection is established, or if a new minor gets created |
|
in a connection */ |
|
int drbd_connected(struct drbd_peer_device *peer_device) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
int err; |
|
|
|
atomic_set(&device->packet_seq, 0); |
|
device->peer_seq = 0; |
|
|
|
device->state_mutex = peer_device->connection->agreed_pro_version < 100 ? |
|
&peer_device->connection->cstate_mutex : |
|
&device->own_state_mutex; |
|
|
|
err = drbd_send_sync_param(peer_device); |
|
if (!err) |
|
err = drbd_send_sizes(peer_device, 0, 0); |
|
if (!err) |
|
err = drbd_send_uuids(peer_device); |
|
if (!err) |
|
err = drbd_send_current_state(peer_device); |
|
clear_bit(USE_DEGR_WFC_T, &device->flags); |
|
clear_bit(RESIZE_PENDING, &device->flags); |
|
atomic_set(&device->ap_in_flight, 0); |
|
mod_timer(&device->request_timer, jiffies + HZ); /* just start it here. */ |
|
return err; |
|
} |
|
|
|
/* |
|
* return values: |
|
* 1 yes, we have a valid connection |
|
* 0 oops, did not work out, please try again |
|
* -1 peer talks different language, |
|
* no point in trying again, please go standalone. |
|
* -2 We do not have a network config... |
|
*/ |
|
static int conn_connect(struct drbd_connection *connection) |
|
{ |
|
struct drbd_socket sock, msock; |
|
struct drbd_peer_device *peer_device; |
|
struct net_conf *nc; |
|
int vnr, timeout, h; |
|
bool discard_my_data, ok; |
|
enum drbd_state_rv rv; |
|
struct accept_wait_data ad = { |
|
.connection = connection, |
|
.door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), |
|
}; |
|
|
|
clear_bit(DISCONNECT_SENT, &connection->flags); |
|
if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) |
|
return -2; |
|
|
|
mutex_init(&sock.mutex); |
|
sock.sbuf = connection->data.sbuf; |
|
sock.rbuf = connection->data.rbuf; |
|
sock.socket = NULL; |
|
mutex_init(&msock.mutex); |
|
msock.sbuf = connection->meta.sbuf; |
|
msock.rbuf = connection->meta.rbuf; |
|
msock.socket = NULL; |
|
|
|
/* Assume that the peer only understands protocol 80 until we know better. */ |
|
connection->agreed_pro_version = 80; |
|
|
|
if (prepare_listen_socket(connection, &ad)) |
|
return 0; |
|
|
|
do { |
|
struct socket *s; |
|
|
|
s = drbd_try_connect(connection); |
|
if (s) { |
|
if (!sock.socket) { |
|
sock.socket = s; |
|
send_first_packet(connection, &sock, P_INITIAL_DATA); |
|
} else if (!msock.socket) { |
|
clear_bit(RESOLVE_CONFLICTS, &connection->flags); |
|
msock.socket = s; |
|
send_first_packet(connection, &msock, P_INITIAL_META); |
|
} else { |
|
drbd_err(connection, "Logic error in conn_connect()\n"); |
|
goto out_release_sockets; |
|
} |
|
} |
|
|
|
if (connection_established(connection, &sock.socket, &msock.socket)) |
|
break; |
|
|
|
retry: |
|
s = drbd_wait_for_connect(connection, &ad); |
|
if (s) { |
|
int fp = receive_first_packet(connection, s); |
|
drbd_socket_okay(&sock.socket); |
|
drbd_socket_okay(&msock.socket); |
|
switch (fp) { |
|
case P_INITIAL_DATA: |
|
if (sock.socket) { |
|
drbd_warn(connection, "initial packet S crossed\n"); |
|
sock_release(sock.socket); |
|
sock.socket = s; |
|
goto randomize; |
|
} |
|
sock.socket = s; |
|
break; |
|
case P_INITIAL_META: |
|
set_bit(RESOLVE_CONFLICTS, &connection->flags); |
|
if (msock.socket) { |
|
drbd_warn(connection, "initial packet M crossed\n"); |
|
sock_release(msock.socket); |
|
msock.socket = s; |
|
goto randomize; |
|
} |
|
msock.socket = s; |
|
break; |
|
default: |
|
drbd_warn(connection, "Error receiving initial packet\n"); |
|
sock_release(s); |
|
randomize: |
|
if (prandom_u32() & 1) |
|
goto retry; |
|
} |
|
} |
|
|
|
if (connection->cstate <= C_DISCONNECTING) |
|
goto out_release_sockets; |
|
if (signal_pending(current)) { |
|
flush_signals(current); |
|
smp_rmb(); |
|
if (get_t_state(&connection->receiver) == EXITING) |
|
goto out_release_sockets; |
|
} |
|
|
|
ok = connection_established(connection, &sock.socket, &msock.socket); |
|
} while (!ok); |
|
|
|
if (ad.s_listen) |
|
sock_release(ad.s_listen); |
|
|
|
sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
|
msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
|
|
|
sock.socket->sk->sk_allocation = GFP_NOIO; |
|
msock.socket->sk->sk_allocation = GFP_NOIO; |
|
|
|
sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
|
msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; |
|
|
|
/* NOT YET ... |
|
* sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10; |
|
* sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
|
* first set it to the P_CONNECTION_FEATURES timeout, |
|
* which we set to 4x the configured ping_timeout. */ |
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
|
|
sock.socket->sk->sk_sndtimeo = |
|
sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; |
|
|
|
msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
|
timeout = nc->timeout * HZ / 10; |
|
discard_my_data = nc->discard_my_data; |
|
rcu_read_unlock(); |
|
|
|
msock.socket->sk->sk_sndtimeo = timeout; |
|
|
|
/* we don't want delays. |
|
* we use TCP_CORK where appropriate, though */ |
|
tcp_sock_set_nodelay(sock.socket->sk); |
|
tcp_sock_set_nodelay(msock.socket->sk); |
|
|
|
connection->data.socket = sock.socket; |
|
connection->meta.socket = msock.socket; |
|
connection->last_received = jiffies; |
|
|
|
h = drbd_do_features(connection); |
|
if (h <= 0) |
|
return h; |
|
|
|
if (connection->cram_hmac_tfm) { |
|
/* drbd_request_state(device, NS(conn, WFAuth)); */ |
|
switch (drbd_do_auth(connection)) { |
|
case -1: |
|
drbd_err(connection, "Authentication of peer failed\n"); |
|
return -1; |
|
case 0: |
|
drbd_err(connection, "Authentication of peer failed, trying again.\n"); |
|
return 0; |
|
} |
|
} |
|
|
|
connection->data.socket->sk->sk_sndtimeo = timeout; |
|
connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
|
|
|
if (drbd_send_protocol(connection) == -EOPNOTSUPP) |
|
return -1; |
|
|
|
/* Prevent a race between resync-handshake and |
|
* being promoted to Primary. |
|
* |
|
* Grab and release the state mutex, so we know that any current |
|
* drbd_set_role() is finished, and any incoming drbd_set_role |
|
* will see the STATE_SENT flag, and wait for it to be cleared. |
|
*/ |
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
|
mutex_lock(peer_device->device->state_mutex); |
|
|
|
/* avoid a race with conn_request_state( C_DISCONNECTING ) */ |
|
spin_lock_irq(&connection->resource->req_lock); |
|
set_bit(STATE_SENT, &connection->flags); |
|
spin_unlock_irq(&connection->resource->req_lock); |
|
|
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
|
mutex_unlock(peer_device->device->state_mutex); |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
|
struct drbd_device *device = peer_device->device; |
|
kref_get(&device->kref); |
|
rcu_read_unlock(); |
|
|
|
if (discard_my_data) |
|
set_bit(DISCARD_MY_DATA, &device->flags); |
|
else |
|
clear_bit(DISCARD_MY_DATA, &device->flags); |
|
|
|
drbd_connected(peer_device); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
rcu_read_lock(); |
|
} |
|
rcu_read_unlock(); |
|
|
|
rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE); |
|
if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) { |
|
clear_bit(STATE_SENT, &connection->flags); |
|
return 0; |
|
} |
|
|
|
drbd_thread_start(&connection->ack_receiver); |
|
/* opencoded create_singlethread_workqueue(), |
|
* to be able to use format string arguments */ |
|
connection->ack_sender = |
|
alloc_ordered_workqueue("drbd_as_%s", WQ_MEM_RECLAIM, connection->resource->name); |
|
if (!connection->ack_sender) { |
|
drbd_err(connection, "Failed to create workqueue ack_sender\n"); |
|
return 0; |
|
} |
|
|
|
mutex_lock(&connection->resource->conf_update); |
|
/* The discard_my_data flag is a single-shot modifier to the next |
|
* connection attempt, the handshake of which is now well underway. |
|
* No need for rcu style copying of the whole struct |
|
* just to clear a single value. */ |
|
connection->net_conf->discard_my_data = 0; |
|
mutex_unlock(&connection->resource->conf_update); |
|
|
|
return h; |
|
|
|
out_release_sockets: |
|
if (ad.s_listen) |
|
sock_release(ad.s_listen); |
|
if (sock.socket) |
|
sock_release(sock.socket); |
|
if (msock.socket) |
|
sock_release(msock.socket); |
|
return -1; |
|
} |
|
|
|
static int decode_header(struct drbd_connection *connection, void *header, struct packet_info *pi) |
|
{ |
|
unsigned int header_size = drbd_header_size(connection); |
|
|
|
if (header_size == sizeof(struct p_header100) && |
|
*(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { |
|
struct p_header100 *h = header; |
|
if (h->pad != 0) { |
|
drbd_err(connection, "Header padding is not zero\n"); |
|
return -EINVAL; |
|
} |
|
pi->vnr = be16_to_cpu(h->volume); |
|
pi->cmd = be16_to_cpu(h->command); |
|
pi->size = be32_to_cpu(h->length); |
|
} else if (header_size == sizeof(struct p_header95) && |
|
*(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { |
|
struct p_header95 *h = header; |
|
pi->cmd = be16_to_cpu(h->command); |
|
pi->size = be32_to_cpu(h->length); |
|
pi->vnr = 0; |
|
} else if (header_size == sizeof(struct p_header80) && |
|
*(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { |
|
struct p_header80 *h = header; |
|
pi->cmd = be16_to_cpu(h->command); |
|
pi->size = be16_to_cpu(h->length); |
|
pi->vnr = 0; |
|
} else { |
|
drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n", |
|
be32_to_cpu(*(__be32 *)header), |
|
connection->agreed_pro_version); |
|
return -EINVAL; |
|
} |
|
pi->data = header + header_size; |
|
return 0; |
|
} |
|
|
|
static void drbd_unplug_all_devices(struct drbd_connection *connection) |
|
{ |
|
if (current->plug == &connection->receiver_plug) { |
|
blk_finish_plug(&connection->receiver_plug); |
|
blk_start_plug(&connection->receiver_plug); |
|
} /* else: maybe just schedule() ?? */ |
|
} |
|
|
|
static int drbd_recv_header(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
void *buffer = connection->data.rbuf; |
|
int err; |
|
|
|
err = drbd_recv_all_warn(connection, buffer, drbd_header_size(connection)); |
|
if (err) |
|
return err; |
|
|
|
err = decode_header(connection, buffer, pi); |
|
connection->last_received = jiffies; |
|
|
|
return err; |
|
} |
|
|
|
static int drbd_recv_header_maybe_unplug(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
void *buffer = connection->data.rbuf; |
|
unsigned int size = drbd_header_size(connection); |
|
int err; |
|
|
|
err = drbd_recv_short(connection->data.socket, buffer, size, MSG_NOSIGNAL|MSG_DONTWAIT); |
|
if (err != size) { |
|
/* If we have nothing in the receive buffer now, to reduce |
|
* application latency, try to drain the backend queues as |
|
* quickly as possible, and let remote TCP know what we have |
|
* received so far. */ |
|
if (err == -EAGAIN) { |
|
tcp_sock_set_quickack(connection->data.socket->sk, 2); |
|
drbd_unplug_all_devices(connection); |
|
} |
|
if (err > 0) { |
|
buffer += err; |
|
size -= err; |
|
} |
|
err = drbd_recv_all_warn(connection, buffer, size); |
|
if (err) |
|
return err; |
|
} |
|
|
|
err = decode_header(connection, connection->data.rbuf, pi); |
|
connection->last_received = jiffies; |
|
|
|
return err; |
|
} |
|
/* This is blkdev_issue_flush, but asynchronous. |
|
* We want to submit to all component volumes in parallel, |
|
* then wait for all completions. |
|
*/ |
|
struct issue_flush_context { |
|
atomic_t pending; |
|
int error; |
|
struct completion done; |
|
}; |
|
struct one_flush_context { |
|
struct drbd_device *device; |
|
struct issue_flush_context *ctx; |
|
}; |
|
|
|
static void one_flush_endio(struct bio *bio) |
|
{ |
|
struct one_flush_context *octx = bio->bi_private; |
|
struct drbd_device *device = octx->device; |
|
struct issue_flush_context *ctx = octx->ctx; |
|
|
|
if (bio->bi_status) { |
|
ctx->error = blk_status_to_errno(bio->bi_status); |
|
drbd_info(device, "local disk FLUSH FAILED with status %d\n", bio->bi_status); |
|
} |
|
kfree(octx); |
|
bio_put(bio); |
|
|
|
clear_bit(FLUSH_PENDING, &device->flags); |
|
put_ldev(device); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
|
|
if (atomic_dec_and_test(&ctx->pending)) |
|
complete(&ctx->done); |
|
} |
|
|
|
static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx) |
|
{ |
|
struct bio *bio = bio_alloc(GFP_NOIO, 0); |
|
struct one_flush_context *octx = kmalloc(sizeof(*octx), GFP_NOIO); |
|
if (!bio || !octx) { |
|
drbd_warn(device, "Could not allocate a bio, CANNOT ISSUE FLUSH\n"); |
|
/* FIXME: what else can I do now? disconnecting or detaching |
|
* really does not help to improve the state of the world, either. |
|
*/ |
|
kfree(octx); |
|
if (bio) |
|
bio_put(bio); |
|
|
|
ctx->error = -ENOMEM; |
|
put_ldev(device); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
return; |
|
} |
|
|
|
octx->device = device; |
|
octx->ctx = ctx; |
|
bio_set_dev(bio, device->ldev->backing_bdev); |
|
bio->bi_private = octx; |
|
bio->bi_end_io = one_flush_endio; |
|
bio->bi_opf = REQ_OP_FLUSH | REQ_PREFLUSH; |
|
|
|
device->flush_jif = jiffies; |
|
set_bit(FLUSH_PENDING, &device->flags); |
|
atomic_inc(&ctx->pending); |
|
submit_bio(bio); |
|
} |
|
|
|
static void drbd_flush(struct drbd_connection *connection) |
|
{ |
|
if (connection->resource->write_ordering >= WO_BDEV_FLUSH) { |
|
struct drbd_peer_device *peer_device; |
|
struct issue_flush_context ctx; |
|
int vnr; |
|
|
|
atomic_set(&ctx.pending, 1); |
|
ctx.error = 0; |
|
init_completion(&ctx.done); |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
|
struct drbd_device *device = peer_device->device; |
|
|
|
if (!get_ldev(device)) |
|
continue; |
|
kref_get(&device->kref); |
|
rcu_read_unlock(); |
|
|
|
submit_one_flush(device, &ctx); |
|
|
|
rcu_read_lock(); |
|
} |
|
rcu_read_unlock(); |
|
|
|
/* Do we want to add a timeout, |
|
* if disk-timeout is set? */ |
|
if (!atomic_dec_and_test(&ctx.pending)) |
|
wait_for_completion(&ctx.done); |
|
|
|
if (ctx.error) { |
|
/* would rather check on EOPNOTSUPP, but that is not reliable. |
|
* don't try again for ANY return value != 0 |
|
* if (rv == -EOPNOTSUPP) */ |
|
/* Any error is already reported by bio_endio callback. */ |
|
drbd_bump_write_ordering(connection->resource, NULL, WO_DRAIN_IO); |
|
} |
|
} |
|
} |
|
|
|
/** |
|
* drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. |
|
* @connection: DRBD connection. |
|
* @epoch: Epoch object. |
|
* @ev: Epoch event. |
|
*/ |
|
static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection, |
|
struct drbd_epoch *epoch, |
|
enum epoch_event ev) |
|
{ |
|
int epoch_size; |
|
struct drbd_epoch *next_epoch; |
|
enum finish_epoch rv = FE_STILL_LIVE; |
|
|
|
spin_lock(&connection->epoch_lock); |
|
do { |
|
next_epoch = NULL; |
|
|
|
epoch_size = atomic_read(&epoch->epoch_size); |
|
|
|
switch (ev & ~EV_CLEANUP) { |
|
case EV_PUT: |
|
atomic_dec(&epoch->active); |
|
break; |
|
case EV_GOT_BARRIER_NR: |
|
set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); |
|
break; |
|
case EV_BECAME_LAST: |
|
/* nothing to do*/ |
|
break; |
|
} |
|
|
|
if (epoch_size != 0 && |
|
atomic_read(&epoch->active) == 0 && |
|
(test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
|
if (!(ev & EV_CLEANUP)) { |
|
spin_unlock(&connection->epoch_lock); |
|
drbd_send_b_ack(epoch->connection, epoch->barrier_nr, epoch_size); |
|
spin_lock(&connection->epoch_lock); |
|
} |
|
#if 0 |
|
/* FIXME: dec unacked on connection, once we have |
|
* something to count pending connection packets in. */ |
|
if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
|
dec_unacked(epoch->connection); |
|
#endif |
|
|
|
if (connection->current_epoch != epoch) { |
|
next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
|
list_del(&epoch->list); |
|
ev = EV_BECAME_LAST | (ev & EV_CLEANUP); |
|
connection->epochs--; |
|
kfree(epoch); |
|
|
|
if (rv == FE_STILL_LIVE) |
|
rv = FE_DESTROYED; |
|
} else { |
|
epoch->flags = 0; |
|
atomic_set(&epoch->epoch_size, 0); |
|
/* atomic_set(&epoch->active, 0); is already zero */ |
|
if (rv == FE_STILL_LIVE) |
|
rv = FE_RECYCLED; |
|
} |
|
} |
|
|
|
if (!next_epoch) |
|
break; |
|
|
|
epoch = next_epoch; |
|
} while (1); |
|
|
|
spin_unlock(&connection->epoch_lock); |
|
|
|
return rv; |
|
} |
|
|
|
static enum write_ordering_e |
|
max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo) |
|
{ |
|
struct disk_conf *dc; |
|
|
|
dc = rcu_dereference(bdev->disk_conf); |
|
|
|
if (wo == WO_BDEV_FLUSH && !dc->disk_flushes) |
|
wo = WO_DRAIN_IO; |
|
if (wo == WO_DRAIN_IO && !dc->disk_drain) |
|
wo = WO_NONE; |
|
|
|
return wo; |
|
} |
|
|
|
/* |
|
* drbd_bump_write_ordering() - Fall back to an other write ordering method |
|
* @wo: Write ordering method to try. |
|
*/ |
|
void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
|
enum write_ordering_e wo) |
|
{ |
|
struct drbd_device *device; |
|
enum write_ordering_e pwo; |
|
int vnr; |
|
static char *write_ordering_str[] = { |
|
[WO_NONE] = "none", |
|
[WO_DRAIN_IO] = "drain", |
|
[WO_BDEV_FLUSH] = "flush", |
|
}; |
|
|
|
pwo = resource->write_ordering; |
|
if (wo != WO_BDEV_FLUSH) |
|
wo = min(pwo, wo); |
|
rcu_read_lock(); |
|
idr_for_each_entry(&resource->devices, device, vnr) { |
|
if (get_ldev(device)) { |
|
wo = max_allowed_wo(device->ldev, wo); |
|
if (device->ldev == bdev) |
|
bdev = NULL; |
|
put_ldev(device); |
|
} |
|
} |
|
|
|
if (bdev) |
|
wo = max_allowed_wo(bdev, wo); |
|
|
|
rcu_read_unlock(); |
|
|
|
resource->write_ordering = wo; |
|
if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH) |
|
drbd_info(resource, "Method to ensure write ordering: %s\n", write_ordering_str[resource->write_ordering]); |
|
} |
|
|
|
/* |
|
* Mapping "discard" to ZEROOUT with UNMAP does not work for us: |
|
* Drivers have to "announce" q->limits.max_write_zeroes_sectors, or it |
|
* will directly go to fallback mode, submitting normal writes, and |
|
* never even try to UNMAP. |
|
* |
|
* And dm-thin does not do this (yet), mostly because in general it has |
|
* to assume that "skip_block_zeroing" is set. See also: |
|
* https://www.mail-archive.com/dm-devel%40redhat.com/msg07965.html |
|
* https://www.redhat.com/archives/dm-devel/2018-January/msg00271.html |
|
* |
|
* We *may* ignore the discard-zeroes-data setting, if so configured. |
|
* |
|
* Assumption is that this "discard_zeroes_data=0" is only because the backend |
|
* may ignore partial unaligned discards. |
|
* |
|
* LVM/DM thin as of at least |
|
* LVM version: 2.02.115(2)-RHEL7 (2015-01-28) |
|
* Library version: 1.02.93-RHEL7 (2015-01-28) |
|
* Driver version: 4.29.0 |
|
* still behaves this way. |
|
* |
|
* For unaligned (wrt. alignment and granularity) or too small discards, |
|
* we zero-out the initial (and/or) trailing unaligned partial chunks, |
|
* but discard all the aligned full chunks. |
|
* |
|
* At least for LVM/DM thin, with skip_block_zeroing=false, |
|
* the result is effectively "discard_zeroes_data=1". |
|
*/ |
|
/* flags: EE_TRIM|EE_ZEROOUT */ |
|
int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, unsigned int nr_sectors, int flags) |
|
{ |
|
struct block_device *bdev = device->ldev->backing_bdev; |
|
struct request_queue *q = bdev_get_queue(bdev); |
|
sector_t tmp, nr; |
|
unsigned int max_discard_sectors, granularity; |
|
int alignment; |
|
int err = 0; |
|
|
|
if ((flags & EE_ZEROOUT) || !(flags & EE_TRIM)) |
|
goto zero_out; |
|
|
|
/* Zero-sector (unknown) and one-sector granularities are the same. */ |
|
granularity = max(q->limits.discard_granularity >> 9, 1U); |
|
alignment = (bdev_discard_alignment(bdev) >> 9) % granularity; |
|
|
|
max_discard_sectors = min(q->limits.max_discard_sectors, (1U << 22)); |
|
max_discard_sectors -= max_discard_sectors % granularity; |
|
if (unlikely(!max_discard_sectors)) |
|
goto zero_out; |
|
|
|
if (nr_sectors < granularity) |
|
goto zero_out; |
|
|
|
tmp = start; |
|
if (sector_div(tmp, granularity) != alignment) { |
|
if (nr_sectors < 2*granularity) |
|
goto zero_out; |
|
/* start + gran - (start + gran - align) % gran */ |
|
tmp = start + granularity - alignment; |
|
tmp = start + granularity - sector_div(tmp, granularity); |
|
|
|
nr = tmp - start; |
|
/* don't flag BLKDEV_ZERO_NOUNMAP, we don't know how many |
|
* layers are below us, some may have smaller granularity */ |
|
err |= blkdev_issue_zeroout(bdev, start, nr, GFP_NOIO, 0); |
|
nr_sectors -= nr; |
|
start = tmp; |
|
} |
|
while (nr_sectors >= max_discard_sectors) { |
|
err |= blkdev_issue_discard(bdev, start, max_discard_sectors, GFP_NOIO, 0); |
|
nr_sectors -= max_discard_sectors; |
|
start += max_discard_sectors; |
|
} |
|
if (nr_sectors) { |
|
/* max_discard_sectors is unsigned int (and a multiple of |
|
* granularity, we made sure of that above already); |
|
* nr is < max_discard_sectors; |
|
* I don't need sector_div here, even though nr is sector_t */ |
|
nr = nr_sectors; |
|
nr -= (unsigned int)nr % granularity; |
|
if (nr) { |
|
err |= blkdev_issue_discard(bdev, start, nr, GFP_NOIO, 0); |
|
nr_sectors -= nr; |
|
start += nr; |
|
} |
|
} |
|
zero_out: |
|
if (nr_sectors) { |
|
err |= blkdev_issue_zeroout(bdev, start, nr_sectors, GFP_NOIO, |
|
(flags & EE_TRIM) ? 0 : BLKDEV_ZERO_NOUNMAP); |
|
} |
|
return err != 0; |
|
} |
|
|
|
static bool can_do_reliable_discards(struct drbd_device *device) |
|
{ |
|
struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev); |
|
struct disk_conf *dc; |
|
bool can_do; |
|
|
|
if (!blk_queue_discard(q)) |
|
return false; |
|
|
|
rcu_read_lock(); |
|
dc = rcu_dereference(device->ldev->disk_conf); |
|
can_do = dc->discard_zeroes_if_aligned; |
|
rcu_read_unlock(); |
|
return can_do; |
|
} |
|
|
|
static void drbd_issue_peer_discard_or_zero_out(struct drbd_device *device, struct drbd_peer_request *peer_req) |
|
{ |
|
/* If the backend cannot discard, or does not guarantee |
|
* read-back zeroes in discarded ranges, we fall back to |
|
* zero-out. Unless configuration specifically requested |
|
* otherwise. */ |
|
if (!can_do_reliable_discards(device)) |
|
peer_req->flags |= EE_ZEROOUT; |
|
|
|
if (drbd_issue_discard_or_zero_out(device, peer_req->i.sector, |
|
peer_req->i.size >> 9, peer_req->flags & (EE_ZEROOUT|EE_TRIM))) |
|
peer_req->flags |= EE_WAS_ERROR; |
|
drbd_endio_write_sec_final(peer_req); |
|
} |
|
|
|
static void drbd_issue_peer_wsame(struct drbd_device *device, |
|
struct drbd_peer_request *peer_req) |
|
{ |
|
struct block_device *bdev = device->ldev->backing_bdev; |
|
sector_t s = peer_req->i.sector; |
|
sector_t nr = peer_req->i.size >> 9; |
|
if (blkdev_issue_write_same(bdev, s, nr, GFP_NOIO, peer_req->pages)) |
|
peer_req->flags |= EE_WAS_ERROR; |
|
drbd_endio_write_sec_final(peer_req); |
|
} |
|
|
|
|
|
/* |
|
* drbd_submit_peer_request() |
|
* @device: DRBD device. |
|
* @peer_req: peer request |
|
* |
|
* May spread the pages to multiple bios, |
|
* depending on bio_add_page restrictions. |
|
* |
|
* Returns 0 if all bios have been submitted, |
|
* -ENOMEM if we could not allocate enough bios, |
|
* -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a |
|
* single page to an empty bio (which should never happen and likely indicates |
|
* that the lower level IO stack is in some way broken). This has been observed |
|
* on certain Xen deployments. |
|
*/ |
|
/* TODO allocate from our own bio_set. */ |
|
int drbd_submit_peer_request(struct drbd_device *device, |
|
struct drbd_peer_request *peer_req, |
|
const unsigned op, const unsigned op_flags, |
|
const int fault_type) |
|
{ |
|
struct bio *bios = NULL; |
|
struct bio *bio; |
|
struct page *page = peer_req->pages; |
|
sector_t sector = peer_req->i.sector; |
|
unsigned data_size = peer_req->i.size; |
|
unsigned n_bios = 0; |
|
unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
|
int err = -ENOMEM; |
|
|
|
/* TRIM/DISCARD: for now, always use the helper function |
|
* blkdev_issue_zeroout(..., discard=true). |
|
* It's synchronous, but it does the right thing wrt. bio splitting. |
|
* Correctness first, performance later. Next step is to code an |
|
* asynchronous variant of the same. |
|
*/ |
|
if (peer_req->flags & (EE_TRIM|EE_WRITE_SAME|EE_ZEROOUT)) { |
|
/* wait for all pending IO completions, before we start |
|
* zeroing things out. */ |
|
conn_wait_active_ee_empty(peer_req->peer_device->connection); |
|
/* add it to the active list now, |
|
* so we can find it to present it in debugfs */ |
|
peer_req->submit_jif = jiffies; |
|
peer_req->flags |= EE_SUBMITTED; |
|
|
|
/* If this was a resync request from receive_rs_deallocated(), |
|
* it is already on the sync_ee list */ |
|
if (list_empty(&peer_req->w.list)) { |
|
spin_lock_irq(&device->resource->req_lock); |
|
list_add_tail(&peer_req->w.list, &device->active_ee); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
} |
|
|
|
if (peer_req->flags & (EE_TRIM|EE_ZEROOUT)) |
|
drbd_issue_peer_discard_or_zero_out(device, peer_req); |
|
else /* EE_WRITE_SAME */ |
|
drbd_issue_peer_wsame(device, peer_req); |
|
return 0; |
|
} |
|
|
|
/* In most cases, we will only need one bio. But in case the lower |
|
* level restrictions happen to be different at this offset on this |
|
* side than those of the sending peer, we may need to submit the |
|
* request in more than one bio. |
|
* |
|
* Plain bio_alloc is good enough here, this is no DRBD internally |
|
* generated bio, but a bio allocated on behalf of the peer. |
|
*/ |
|
next_bio: |
|
bio = bio_alloc(GFP_NOIO, nr_pages); |
|
if (!bio) { |
|
drbd_err(device, "submit_ee: Allocation of a bio failed (nr_pages=%u)\n", nr_pages); |
|
goto fail; |
|
} |
|
/* > peer_req->i.sector, unless this is the first bio */ |
|
bio->bi_iter.bi_sector = sector; |
|
bio_set_dev(bio, device->ldev->backing_bdev); |
|
bio_set_op_attrs(bio, op, op_flags); |
|
bio->bi_private = peer_req; |
|
bio->bi_end_io = drbd_peer_request_endio; |
|
|
|
bio->bi_next = bios; |
|
bios = bio; |
|
++n_bios; |
|
|
|
page_chain_for_each(page) { |
|
unsigned len = min_t(unsigned, data_size, PAGE_SIZE); |
|
if (!bio_add_page(bio, page, len, 0)) |
|
goto next_bio; |
|
data_size -= len; |
|
sector += len >> 9; |
|
--nr_pages; |
|
} |
|
D_ASSERT(device, data_size == 0); |
|
D_ASSERT(device, page == NULL); |
|
|
|
atomic_set(&peer_req->pending_bios, n_bios); |
|
/* for debugfs: update timestamp, mark as submitted */ |
|
peer_req->submit_jif = jiffies; |
|
peer_req->flags |= EE_SUBMITTED; |
|
do { |
|
bio = bios; |
|
bios = bios->bi_next; |
|
bio->bi_next = NULL; |
|
|
|
drbd_submit_bio_noacct(device, fault_type, bio); |
|
} while (bios); |
|
return 0; |
|
|
|
fail: |
|
while (bios) { |
|
bio = bios; |
|
bios = bios->bi_next; |
|
bio_put(bio); |
|
} |
|
return err; |
|
} |
|
|
|
static void drbd_remove_epoch_entry_interval(struct drbd_device *device, |
|
struct drbd_peer_request *peer_req) |
|
{ |
|
struct drbd_interval *i = &peer_req->i; |
|
|
|
drbd_remove_interval(&device->write_requests, i); |
|
drbd_clear_interval(i); |
|
|
|
/* Wake up any processes waiting for this peer request to complete. */ |
|
if (i->waiting) |
|
wake_up(&device->misc_wait); |
|
} |
|
|
|
static void conn_wait_active_ee_empty(struct drbd_connection *connection) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
int vnr; |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
|
struct drbd_device *device = peer_device->device; |
|
|
|
kref_get(&device->kref); |
|
rcu_read_unlock(); |
|
drbd_wait_ee_list_empty(device, &device->active_ee); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
rcu_read_lock(); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
int rv; |
|
struct p_barrier *p = pi->data; |
|
struct drbd_epoch *epoch; |
|
|
|
/* FIXME these are unacked on connection, |
|
* not a specific (peer)device. |
|
*/ |
|
connection->current_epoch->barrier_nr = p->barrier; |
|
connection->current_epoch->connection = connection; |
|
rv = drbd_may_finish_epoch(connection, connection->current_epoch, EV_GOT_BARRIER_NR); |
|
|
|
/* P_BARRIER_ACK may imply that the corresponding extent is dropped from |
|
* the activity log, which means it would not be resynced in case the |
|
* R_PRIMARY crashes now. |
|
* Therefore we must send the barrier_ack after the barrier request was |
|
* completed. */ |
|
switch (connection->resource->write_ordering) { |
|
case WO_NONE: |
|
if (rv == FE_RECYCLED) |
|
return 0; |
|
|
|
/* receiver context, in the writeout path of the other node. |
|
* avoid potential distributed deadlock */ |
|
epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
|
if (epoch) |
|
break; |
|
else |
|
drbd_warn(connection, "Allocation of an epoch failed, slowing down\n"); |
|
fallthrough; |
|
|
|
case WO_BDEV_FLUSH: |
|
case WO_DRAIN_IO: |
|
conn_wait_active_ee_empty(connection); |
|
drbd_flush(connection); |
|
|
|
if (atomic_read(&connection->current_epoch->epoch_size)) { |
|
epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
|
if (epoch) |
|
break; |
|
} |
|
|
|
return 0; |
|
default: |
|
drbd_err(connection, "Strangeness in connection->write_ordering %d\n", |
|
connection->resource->write_ordering); |
|
return -EIO; |
|
} |
|
|
|
epoch->flags = 0; |
|
atomic_set(&epoch->epoch_size, 0); |
|
atomic_set(&epoch->active, 0); |
|
|
|
spin_lock(&connection->epoch_lock); |
|
if (atomic_read(&connection->current_epoch->epoch_size)) { |
|
list_add(&epoch->list, &connection->current_epoch->list); |
|
connection->current_epoch = epoch; |
|
connection->epochs++; |
|
} else { |
|
/* The current_epoch got recycled while we allocated this one... */ |
|
kfree(epoch); |
|
} |
|
spin_unlock(&connection->epoch_lock); |
|
|
|
return 0; |
|
} |
|
|
|
/* quick wrapper in case payload size != request_size (write same) */ |
|
static void drbd_csum_ee_size(struct crypto_shash *h, |
|
struct drbd_peer_request *r, void *d, |
|
unsigned int payload_size) |
|
{ |
|
unsigned int tmp = r->i.size; |
|
r->i.size = payload_size; |
|
drbd_csum_ee(h, r, d); |
|
r->i.size = tmp; |
|
} |
|
|
|
/* used from receive_RSDataReply (recv_resync_read) |
|
* and from receive_Data. |
|
* data_size: actual payload ("data in") |
|
* for normal writes that is bi_size. |
|
* for discards, that is zero. |
|
* for write same, it is logical_block_size. |
|
* both trim and write same have the bi_size ("data len to be affected") |
|
* as extra argument in the packet header. |
|
*/ |
|
static struct drbd_peer_request * |
|
read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
|
struct packet_info *pi) __must_hold(local) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
const sector_t capacity = get_capacity(device->vdisk); |
|
struct drbd_peer_request *peer_req; |
|
struct page *page; |
|
int digest_size, err; |
|
unsigned int data_size = pi->size, ds; |
|
void *dig_in = peer_device->connection->int_dig_in; |
|
void *dig_vv = peer_device->connection->int_dig_vv; |
|
unsigned long *data; |
|
struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL; |
|
struct p_trim *zeroes = (pi->cmd == P_ZEROES) ? pi->data : NULL; |
|
struct p_trim *wsame = (pi->cmd == P_WSAME) ? pi->data : NULL; |
|
|
|
digest_size = 0; |
|
if (!trim && peer_device->connection->peer_integrity_tfm) { |
|
digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
|
/* |
|
* FIXME: Receive the incoming digest into the receive buffer |
|
* here, together with its struct p_data? |
|
*/ |
|
err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
|
if (err) |
|
return NULL; |
|
data_size -= digest_size; |
|
} |
|
|
|
/* assume request_size == data_size, but special case trim and wsame. */ |
|
ds = data_size; |
|
if (trim) { |
|
if (!expect(data_size == 0)) |
|
return NULL; |
|
ds = be32_to_cpu(trim->size); |
|
} else if (zeroes) { |
|
if (!expect(data_size == 0)) |
|
return NULL; |
|
ds = be32_to_cpu(zeroes->size); |
|
} else if (wsame) { |
|
if (data_size != queue_logical_block_size(device->rq_queue)) { |
|
drbd_err(peer_device, "data size (%u) != drbd logical block size (%u)\n", |
|
data_size, queue_logical_block_size(device->rq_queue)); |
|
return NULL; |
|
} |
|
if (data_size != bdev_logical_block_size(device->ldev->backing_bdev)) { |
|
drbd_err(peer_device, "data size (%u) != backend logical block size (%u)\n", |
|
data_size, bdev_logical_block_size(device->ldev->backing_bdev)); |
|
return NULL; |
|
} |
|
ds = be32_to_cpu(wsame->size); |
|
} |
|
|
|
if (!expect(IS_ALIGNED(ds, 512))) |
|
return NULL; |
|
if (trim || wsame || zeroes) { |
|
if (!expect(ds <= (DRBD_MAX_BBIO_SECTORS << 9))) |
|
return NULL; |
|
} else if (!expect(ds <= DRBD_MAX_BIO_SIZE)) |
|
return NULL; |
|
|
|
/* even though we trust out peer, |
|
* we sometimes have to double check. */ |
|
if (sector + (ds>>9) > capacity) { |
|
drbd_err(device, "request from peer beyond end of local disk: " |
|
"capacity: %llus < sector: %llus + size: %u\n", |
|
(unsigned long long)capacity, |
|
(unsigned long long)sector, ds); |
|
return NULL; |
|
} |
|
|
|
/* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
|
* "criss-cross" setup, that might cause write-out on some other DRBD, |
|
* which in turn might block on the other node at this very place. */ |
|
peer_req = drbd_alloc_peer_req(peer_device, id, sector, ds, data_size, GFP_NOIO); |
|
if (!peer_req) |
|
return NULL; |
|
|
|
peer_req->flags |= EE_WRITE; |
|
if (trim) { |
|
peer_req->flags |= EE_TRIM; |
|
return peer_req; |
|
} |
|
if (zeroes) { |
|
peer_req->flags |= EE_ZEROOUT; |
|
return peer_req; |
|
} |
|
if (wsame) |
|
peer_req->flags |= EE_WRITE_SAME; |
|
|
|
/* receive payload size bytes into page chain */ |
|
ds = data_size; |
|
page = peer_req->pages; |
|
page_chain_for_each(page) { |
|
unsigned len = min_t(int, ds, PAGE_SIZE); |
|
data = kmap(page); |
|
err = drbd_recv_all_warn(peer_device->connection, data, len); |
|
if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) { |
|
drbd_err(device, "Fault injection: Corrupting data on receive\n"); |
|
data[0] = data[0] ^ (unsigned long)-1; |
|
} |
|
kunmap(page); |
|
if (err) { |
|
drbd_free_peer_req(device, peer_req); |
|
return NULL; |
|
} |
|
ds -= len; |
|
} |
|
|
|
if (digest_size) { |
|
drbd_csum_ee_size(peer_device->connection->peer_integrity_tfm, peer_req, dig_vv, data_size); |
|
if (memcmp(dig_in, dig_vv, digest_size)) { |
|
drbd_err(device, "Digest integrity check FAILED: %llus +%u\n", |
|
(unsigned long long)sector, data_size); |
|
drbd_free_peer_req(device, peer_req); |
|
return NULL; |
|
} |
|
} |
|
device->recv_cnt += data_size >> 9; |
|
return peer_req; |
|
} |
|
|
|
/* drbd_drain_block() just takes a data block |
|
* out of the socket input buffer, and discards it. |
|
*/ |
|
static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size) |
|
{ |
|
struct page *page; |
|
int err = 0; |
|
void *data; |
|
|
|
if (!data_size) |
|
return 0; |
|
|
|
page = drbd_alloc_pages(peer_device, 1, 1); |
|
|
|
data = kmap(page); |
|
while (data_size) { |
|
unsigned int len = min_t(int, data_size, PAGE_SIZE); |
|
|
|
err = drbd_recv_all_warn(peer_device->connection, data, len); |
|
if (err) |
|
break; |
|
data_size -= len; |
|
} |
|
kunmap(page); |
|
drbd_free_pages(peer_device->device, page, 0); |
|
return err; |
|
} |
|
|
|
static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req, |
|
sector_t sector, int data_size) |
|
{ |
|
struct bio_vec bvec; |
|
struct bvec_iter iter; |
|
struct bio *bio; |
|
int digest_size, err, expect; |
|
void *dig_in = peer_device->connection->int_dig_in; |
|
void *dig_vv = peer_device->connection->int_dig_vv; |
|
|
|
digest_size = 0; |
|
if (peer_device->connection->peer_integrity_tfm) { |
|
digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
|
err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
|
if (err) |
|
return err; |
|
data_size -= digest_size; |
|
} |
|
|
|
/* optimistically update recv_cnt. if receiving fails below, |
|
* we disconnect anyways, and counters will be reset. */ |
|
peer_device->device->recv_cnt += data_size>>9; |
|
|
|
bio = req->master_bio; |
|
D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); |
|
|
|
bio_for_each_segment(bvec, bio, iter) { |
|
void *mapped = kmap(bvec.bv_page) + bvec.bv_offset; |
|
expect = min_t(int, data_size, bvec.bv_len); |
|
err = drbd_recv_all_warn(peer_device->connection, mapped, expect); |
|
kunmap(bvec.bv_page); |
|
if (err) |
|
return err; |
|
data_size -= expect; |
|
} |
|
|
|
if (digest_size) { |
|
drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv); |
|
if (memcmp(dig_in, dig_vv, digest_size)) { |
|
drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
D_ASSERT(peer_device->device, data_size == 0); |
|
return 0; |
|
} |
|
|
|
/* |
|
* e_end_resync_block() is called in ack_sender context via |
|
* drbd_finish_peer_reqs(). |
|
*/ |
|
static int e_end_resync_block(struct drbd_work *w, int unused) |
|
{ |
|
struct drbd_peer_request *peer_req = |
|
container_of(w, struct drbd_peer_request, w); |
|
struct drbd_peer_device *peer_device = peer_req->peer_device; |
|
struct drbd_device *device = peer_device->device; |
|
sector_t sector = peer_req->i.sector; |
|
int err; |
|
|
|
D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
|
|
|
if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
|
drbd_set_in_sync(device, sector, peer_req->i.size); |
|
err = drbd_send_ack(peer_device, P_RS_WRITE_ACK, peer_req); |
|
} else { |
|
/* Record failure to sync */ |
|
drbd_rs_failed_io(device, sector, peer_req->i.size); |
|
|
|
err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
|
} |
|
dec_unacked(device); |
|
|
|
return err; |
|
} |
|
|
|
static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector, |
|
struct packet_info *pi) __releases(local) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
struct drbd_peer_request *peer_req; |
|
|
|
peer_req = read_in_block(peer_device, ID_SYNCER, sector, pi); |
|
if (!peer_req) |
|
goto fail; |
|
|
|
dec_rs_pending(device); |
|
|
|
inc_unacked(device); |
|
/* corresponding dec_unacked() in e_end_resync_block() |
|
* respective _drbd_clear_done_ee */ |
|
|
|
peer_req->w.cb = e_end_resync_block; |
|
peer_req->submit_jif = jiffies; |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
list_add_tail(&peer_req->w.list, &device->sync_ee); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
atomic_add(pi->size >> 9, &device->rs_sect_ev); |
|
if (drbd_submit_peer_request(device, peer_req, REQ_OP_WRITE, 0, |
|
DRBD_FAULT_RS_WR) == 0) |
|
return 0; |
|
|
|
/* don't care for the reason here */ |
|
drbd_err(device, "submit failed, triggering re-connect\n"); |
|
spin_lock_irq(&device->resource->req_lock); |
|
list_del(&peer_req->w.list); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
drbd_free_peer_req(device, peer_req); |
|
fail: |
|
put_ldev(device); |
|
return -EIO; |
|
} |
|
|
|
static struct drbd_request * |
|
find_request(struct drbd_device *device, struct rb_root *root, u64 id, |
|
sector_t sector, bool missing_ok, const char *func) |
|
{ |
|
struct drbd_request *req; |
|
|
|
/* Request object according to our peer */ |
|
req = (struct drbd_request *)(unsigned long)id; |
|
if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
|
return req; |
|
if (!missing_ok) { |
|
drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n", func, |
|
(unsigned long)id, (unsigned long long)sector); |
|
} |
|
return NULL; |
|
} |
|
|
|
static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct drbd_request *req; |
|
sector_t sector; |
|
int err; |
|
struct p_data *p = pi->data; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
sector = be64_to_cpu(p->sector); |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
req = find_request(device, &device->read_requests, p->block_id, sector, false, __func__); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
if (unlikely(!req)) |
|
return -EIO; |
|
|
|
/* hlist_del(&req->collision) is done in _req_may_be_done, to avoid |
|
* special casing it there for the various failure cases. |
|
* still no race with drbd_fail_pending_reads */ |
|
err = recv_dless_read(peer_device, req, sector, pi->size); |
|
if (!err) |
|
req_mod(req, DATA_RECEIVED); |
|
/* else: nothing. handled from drbd_disconnect... |
|
* I don't think we may complete this just yet |
|
* in case we are "on-disconnect: freeze" */ |
|
|
|
return err; |
|
} |
|
|
|
static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
sector_t sector; |
|
int err; |
|
struct p_data *p = pi->data; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
sector = be64_to_cpu(p->sector); |
|
D_ASSERT(device, p->block_id == ID_SYNCER); |
|
|
|
if (get_ldev(device)) { |
|
/* data is submitted to disk within recv_resync_read. |
|
* corresponding put_ldev done below on error, |
|
* or in drbd_peer_request_endio. */ |
|
err = recv_resync_read(peer_device, sector, pi); |
|
} else { |
|
if (__ratelimit(&drbd_ratelimit_state)) |
|
drbd_err(device, "Can not write resync data to local disk.\n"); |
|
|
|
err = drbd_drain_block(peer_device, pi->size); |
|
|
|
drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); |
|
} |
|
|
|
atomic_add(pi->size >> 9, &device->rs_sect_in); |
|
|
|
return err; |
|
} |
|
|
|
static void restart_conflicting_writes(struct drbd_device *device, |
|
sector_t sector, int size) |
|
{ |
|
struct drbd_interval *i; |
|
struct drbd_request *req; |
|
|
|
drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
|
if (!i->local) |
|
continue; |
|
req = container_of(i, struct drbd_request, i); |
|
if (req->rq_state & RQ_LOCAL_PENDING || |
|
!(req->rq_state & RQ_POSTPONED)) |
|
continue; |
|
/* as it is RQ_POSTPONED, this will cause it to |
|
* be queued on the retry workqueue. */ |
|
__req_mod(req, CONFLICT_RESOLVED, NULL); |
|
} |
|
} |
|
|
|
/* |
|
* e_end_block() is called in ack_sender context via drbd_finish_peer_reqs(). |
|
*/ |
|
static int e_end_block(struct drbd_work *w, int cancel) |
|
{ |
|
struct drbd_peer_request *peer_req = |
|
container_of(w, struct drbd_peer_request, w); |
|
struct drbd_peer_device *peer_device = peer_req->peer_device; |
|
struct drbd_device *device = peer_device->device; |
|
sector_t sector = peer_req->i.sector; |
|
int err = 0, pcmd; |
|
|
|
if (peer_req->flags & EE_SEND_WRITE_ACK) { |
|
if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
|
pcmd = (device->state.conn >= C_SYNC_SOURCE && |
|
device->state.conn <= C_PAUSED_SYNC_T && |
|
peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
|
P_RS_WRITE_ACK : P_WRITE_ACK; |
|
err = drbd_send_ack(peer_device, pcmd, peer_req); |
|
if (pcmd == P_RS_WRITE_ACK) |
|
drbd_set_in_sync(device, sector, peer_req->i.size); |
|
} else { |
|
err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
|
/* we expect it to be marked out of sync anyways... |
|
* maybe assert this? */ |
|
} |
|
dec_unacked(device); |
|
} |
|
|
|
/* we delete from the conflict detection hash _after_ we sent out the |
|
* P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ |
|
if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
|
spin_lock_irq(&device->resource->req_lock); |
|
D_ASSERT(device, !drbd_interval_empty(&peer_req->i)); |
|
drbd_remove_epoch_entry_interval(device, peer_req); |
|
if (peer_req->flags & EE_RESTART_REQUESTS) |
|
restart_conflicting_writes(device, sector, peer_req->i.size); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
} else |
|
D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
|
|
|
drbd_may_finish_epoch(peer_device->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
|
|
|
return err; |
|
} |
|
|
|
static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
|
{ |
|
struct drbd_peer_request *peer_req = |
|
container_of(w, struct drbd_peer_request, w); |
|
struct drbd_peer_device *peer_device = peer_req->peer_device; |
|
int err; |
|
|
|
err = drbd_send_ack(peer_device, ack, peer_req); |
|
dec_unacked(peer_device->device); |
|
|
|
return err; |
|
} |
|
|
|
static int e_send_superseded(struct drbd_work *w, int unused) |
|
{ |
|
return e_send_ack(w, P_SUPERSEDED); |
|
} |
|
|
|
static int e_send_retry_write(struct drbd_work *w, int unused) |
|
{ |
|
struct drbd_peer_request *peer_req = |
|
container_of(w, struct drbd_peer_request, w); |
|
struct drbd_connection *connection = peer_req->peer_device->connection; |
|
|
|
return e_send_ack(w, connection->agreed_pro_version >= 100 ? |
|
P_RETRY_WRITE : P_SUPERSEDED); |
|
} |
|
|
|
static bool seq_greater(u32 a, u32 b) |
|
{ |
|
/* |
|
* We assume 32-bit wrap-around here. |
|
* For 24-bit wrap-around, we would have to shift: |
|
* a <<= 8; b <<= 8; |
|
*/ |
|
return (s32)a - (s32)b > 0; |
|
} |
|
|
|
static u32 seq_max(u32 a, u32 b) |
|
{ |
|
return seq_greater(a, b) ? a : b; |
|
} |
|
|
|
static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
unsigned int newest_peer_seq; |
|
|
|
if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) { |
|
spin_lock(&device->peer_seq_lock); |
|
newest_peer_seq = seq_max(device->peer_seq, peer_seq); |
|
device->peer_seq = newest_peer_seq; |
|
spin_unlock(&device->peer_seq_lock); |
|
/* wake up only if we actually changed device->peer_seq */ |
|
if (peer_seq == newest_peer_seq) |
|
wake_up(&device->seq_wait); |
|
} |
|
} |
|
|
|
static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
|
{ |
|
return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); |
|
} |
|
|
|
/* maybe change sync_ee into interval trees as well? */ |
|
static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req) |
|
{ |
|
struct drbd_peer_request *rs_req; |
|
bool rv = false; |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
list_for_each_entry(rs_req, &device->sync_ee, w.list) { |
|
if (overlaps(peer_req->i.sector, peer_req->i.size, |
|
rs_req->i.sector, rs_req->i.size)) { |
|
rv = true; |
|
break; |
|
} |
|
} |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
return rv; |
|
} |
|
|
|
/* Called from receive_Data. |
|
* Synchronize packets on sock with packets on msock. |
|
* |
|
* This is here so even when a P_DATA packet traveling via sock overtook an Ack |
|
* packet traveling on msock, they are still processed in the order they have |
|
* been sent. |
|
* |
|
* Note: we don't care for Ack packets overtaking P_DATA packets. |
|
* |
|
* In case packet_seq is larger than device->peer_seq number, there are |
|
* outstanding packets on the msock. We wait for them to arrive. |
|
* In case we are the logically next packet, we update device->peer_seq |
|
* ourselves. Correctly handles 32bit wrap around. |
|
* |
|
* Assume we have a 10 GBit connection, that is about 1<<30 byte per second, |
|
* about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds |
|
* for the 24bit wrap (historical atomic_t guarantee on some archs), and we have |
|
* 1<<9 == 512 seconds aka ages for the 32bit wrap around... |
|
* |
|
* returns 0 if we may process the packet, |
|
* -ERESTARTSYS if we were interrupted (by disconnect signal). */ |
|
static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
DEFINE_WAIT(wait); |
|
long timeout; |
|
int ret = 0, tp; |
|
|
|
if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) |
|
return 0; |
|
|
|
spin_lock(&device->peer_seq_lock); |
|
for (;;) { |
|
if (!seq_greater(peer_seq - 1, device->peer_seq)) { |
|
device->peer_seq = seq_max(device->peer_seq, peer_seq); |
|
break; |
|
} |
|
|
|
if (signal_pending(current)) { |
|
ret = -ERESTARTSYS; |
|
break; |
|
} |
|
|
|
rcu_read_lock(); |
|
tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries; |
|
rcu_read_unlock(); |
|
|
|
if (!tp) |
|
break; |
|
|
|
/* Only need to wait if two_primaries is enabled */ |
|
prepare_to_wait(&device->seq_wait, &wait, TASK_INTERRUPTIBLE); |
|
spin_unlock(&device->peer_seq_lock); |
|
rcu_read_lock(); |
|
timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10; |
|
rcu_read_unlock(); |
|
timeout = schedule_timeout(timeout); |
|
spin_lock(&device->peer_seq_lock); |
|
if (!timeout) { |
|
ret = -ETIMEDOUT; |
|
drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n"); |
|
break; |
|
} |
|
} |
|
spin_unlock(&device->peer_seq_lock); |
|
finish_wait(&device->seq_wait, &wait); |
|
return ret; |
|
} |
|
|
|
/* see also bio_flags_to_wire() |
|
* DRBD_REQ_*, because we need to semantically map the flags to data packet |
|
* flags and back. We may replicate to other kernel versions. */ |
|
static unsigned long wire_flags_to_bio_flags(u32 dpf) |
|
{ |
|
return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
|
(dpf & DP_FUA ? REQ_FUA : 0) | |
|
(dpf & DP_FLUSH ? REQ_PREFLUSH : 0); |
|
} |
|
|
|
static unsigned long wire_flags_to_bio_op(u32 dpf) |
|
{ |
|
if (dpf & DP_ZEROES) |
|
return REQ_OP_WRITE_ZEROES; |
|
if (dpf & DP_DISCARD) |
|
return REQ_OP_DISCARD; |
|
if (dpf & DP_WSAME) |
|
return REQ_OP_WRITE_SAME; |
|
else |
|
return REQ_OP_WRITE; |
|
} |
|
|
|
static void fail_postponed_requests(struct drbd_device *device, sector_t sector, |
|
unsigned int size) |
|
{ |
|
struct drbd_interval *i; |
|
|
|
repeat: |
|
drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
|
struct drbd_request *req; |
|
struct bio_and_error m; |
|
|
|
if (!i->local) |
|
continue; |
|
req = container_of(i, struct drbd_request, i); |
|
if (!(req->rq_state & RQ_POSTPONED)) |
|
continue; |
|
req->rq_state &= ~RQ_POSTPONED; |
|
__req_mod(req, NEG_ACKED, &m); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
if (m.bio) |
|
complete_master_bio(device, &m); |
|
spin_lock_irq(&device->resource->req_lock); |
|
goto repeat; |
|
} |
|
} |
|
|
|
static int handle_write_conflicts(struct drbd_device *device, |
|
struct drbd_peer_request *peer_req) |
|
{ |
|
struct drbd_connection *connection = peer_req->peer_device->connection; |
|
bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
|
sector_t sector = peer_req->i.sector; |
|
const unsigned int size = peer_req->i.size; |
|
struct drbd_interval *i; |
|
bool equal; |
|
int err; |
|
|
|
/* |
|
* Inserting the peer request into the write_requests tree will prevent |
|
* new conflicting local requests from being added. |
|
*/ |
|
drbd_insert_interval(&device->write_requests, &peer_req->i); |
|
|
|
repeat: |
|
drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
|
if (i == &peer_req->i) |
|
continue; |
|
if (i->completed) |
|
continue; |
|
|
|
if (!i->local) { |
|
/* |
|
* Our peer has sent a conflicting remote request; this |
|
* should not happen in a two-node setup. Wait for the |
|
* earlier peer request to complete. |
|
*/ |
|
err = drbd_wait_misc(device, i); |
|
if (err) |
|
goto out; |
|
goto repeat; |
|
} |
|
|
|
equal = i->sector == sector && i->size == size; |
|
if (resolve_conflicts) { |
|
/* |
|
* If the peer request is fully contained within the |
|
* overlapping request, it can be considered overwritten |
|
* and thus superseded; otherwise, it will be retried |
|
* once all overlapping requests have completed. |
|
*/ |
|
bool superseded = i->sector <= sector && i->sector + |
|
(i->size >> 9) >= sector + (size >> 9); |
|
|
|
if (!equal) |
|
drbd_alert(device, "Concurrent writes detected: " |
|
"local=%llus +%u, remote=%llus +%u, " |
|
"assuming %s came first\n", |
|
(unsigned long long)i->sector, i->size, |
|
(unsigned long long)sector, size, |
|
superseded ? "local" : "remote"); |
|
|
|
peer_req->w.cb = superseded ? e_send_superseded : |
|
e_send_retry_write; |
|
list_add_tail(&peer_req->w.list, &device->done_ee); |
|
queue_work(connection->ack_sender, &peer_req->peer_device->send_acks_work); |
|
|
|
err = -ENOENT; |
|
goto out; |
|
} else { |
|
struct drbd_request *req = |
|
container_of(i, struct drbd_request, i); |
|
|
|
if (!equal) |
|
drbd_alert(device, "Concurrent writes detected: " |
|
"local=%llus +%u, remote=%llus +%u\n", |
|
(unsigned long long)i->sector, i->size, |
|
(unsigned long long)sector, size); |
|
|
|
if (req->rq_state & RQ_LOCAL_PENDING || |
|
!(req->rq_state & RQ_POSTPONED)) { |
|
/* |
|
* Wait for the node with the discard flag to |
|
* decide if this request has been superseded |
|
* or needs to be retried. |
|
* Requests that have been superseded will |
|
* disappear from the write_requests tree. |
|
* |
|
* In addition, wait for the conflicting |
|
* request to finish locally before submitting |
|
* the conflicting peer request. |
|
*/ |
|
err = drbd_wait_misc(device, &req->i); |
|
if (err) { |
|
_conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD); |
|
fail_postponed_requests(device, sector, size); |
|
goto out; |
|
} |
|
goto repeat; |
|
} |
|
/* |
|
* Remember to restart the conflicting requests after |
|
* the new peer request has completed. |
|
*/ |
|
peer_req->flags |= EE_RESTART_REQUESTS; |
|
} |
|
} |
|
err = 0; |
|
|
|
out: |
|
if (err) |
|
drbd_remove_epoch_entry_interval(device, peer_req); |
|
return err; |
|
} |
|
|
|
/* mirrored write */ |
|
static int receive_Data(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct net_conf *nc; |
|
sector_t sector; |
|
struct drbd_peer_request *peer_req; |
|
struct p_data *p = pi->data; |
|
u32 peer_seq = be32_to_cpu(p->seq_num); |
|
int op, op_flags; |
|
u32 dp_flags; |
|
int err, tp; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
if (!get_ldev(device)) { |
|
int err2; |
|
|
|
err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
|
drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); |
|
atomic_inc(&connection->current_epoch->epoch_size); |
|
err2 = drbd_drain_block(peer_device, pi->size); |
|
if (!err) |
|
err = err2; |
|
return err; |
|
} |
|
|
|
/* |
|
* Corresponding put_ldev done either below (on various errors), or in |
|
* drbd_peer_request_endio, if we successfully submit the data at the |
|
* end of this function. |
|
*/ |
|
|
|
sector = be64_to_cpu(p->sector); |
|
peer_req = read_in_block(peer_device, p->block_id, sector, pi); |
|
if (!peer_req) { |
|
put_ldev(device); |
|
return -EIO; |
|
} |
|
|
|
peer_req->w.cb = e_end_block; |
|
peer_req->submit_jif = jiffies; |
|
peer_req->flags |= EE_APPLICATION; |
|
|
|
dp_flags = be32_to_cpu(p->dp_flags); |
|
op = wire_flags_to_bio_op(dp_flags); |
|
op_flags = wire_flags_to_bio_flags(dp_flags); |
|
if (pi->cmd == P_TRIM) { |
|
D_ASSERT(peer_device, peer_req->i.size > 0); |
|
D_ASSERT(peer_device, op == REQ_OP_DISCARD); |
|
D_ASSERT(peer_device, peer_req->pages == NULL); |
|
/* need to play safe: an older DRBD sender |
|
* may mean zero-out while sending P_TRIM. */ |
|
if (0 == (connection->agreed_features & DRBD_FF_WZEROES)) |
|
peer_req->flags |= EE_ZEROOUT; |
|
} else if (pi->cmd == P_ZEROES) { |
|
D_ASSERT(peer_device, peer_req->i.size > 0); |
|
D_ASSERT(peer_device, op == REQ_OP_WRITE_ZEROES); |
|
D_ASSERT(peer_device, peer_req->pages == NULL); |
|
/* Do (not) pass down BLKDEV_ZERO_NOUNMAP? */ |
|
if (dp_flags & DP_DISCARD) |
|
peer_req->flags |= EE_TRIM; |
|
} else if (peer_req->pages == NULL) { |
|
D_ASSERT(device, peer_req->i.size == 0); |
|
D_ASSERT(device, dp_flags & DP_FLUSH); |
|
} |
|
|
|
if (dp_flags & DP_MAY_SET_IN_SYNC) |
|
peer_req->flags |= EE_MAY_SET_IN_SYNC; |
|
|
|
spin_lock(&connection->epoch_lock); |
|
peer_req->epoch = connection->current_epoch; |
|
atomic_inc(&peer_req->epoch->epoch_size); |
|
atomic_inc(&peer_req->epoch->active); |
|
spin_unlock(&connection->epoch_lock); |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(peer_device->connection->net_conf); |
|
tp = nc->two_primaries; |
|
if (peer_device->connection->agreed_pro_version < 100) { |
|
switch (nc->wire_protocol) { |
|
case DRBD_PROT_C: |
|
dp_flags |= DP_SEND_WRITE_ACK; |
|
break; |
|
case DRBD_PROT_B: |
|
dp_flags |= DP_SEND_RECEIVE_ACK; |
|
break; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
if (dp_flags & DP_SEND_WRITE_ACK) { |
|
peer_req->flags |= EE_SEND_WRITE_ACK; |
|
inc_unacked(device); |
|
/* corresponding dec_unacked() in e_end_block() |
|
* respective _drbd_clear_done_ee */ |
|
} |
|
|
|
if (dp_flags & DP_SEND_RECEIVE_ACK) { |
|
/* I really don't like it that the receiver thread |
|
* sends on the msock, but anyways */ |
|
drbd_send_ack(peer_device, P_RECV_ACK, peer_req); |
|
} |
|
|
|
if (tp) { |
|
/* two primaries implies protocol C */ |
|
D_ASSERT(device, dp_flags & DP_SEND_WRITE_ACK); |
|
peer_req->flags |= EE_IN_INTERVAL_TREE; |
|
err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
|
if (err) |
|
goto out_interrupted; |
|
spin_lock_irq(&device->resource->req_lock); |
|
err = handle_write_conflicts(device, peer_req); |
|
if (err) { |
|
spin_unlock_irq(&device->resource->req_lock); |
|
if (err == -ENOENT) { |
|
put_ldev(device); |
|
return 0; |
|
} |
|
goto out_interrupted; |
|
} |
|
} else { |
|
update_peer_seq(peer_device, peer_seq); |
|
spin_lock_irq(&device->resource->req_lock); |
|
} |
|
/* TRIM and WRITE_SAME are processed synchronously, |
|
* we wait for all pending requests, respectively wait for |
|
* active_ee to become empty in drbd_submit_peer_request(); |
|
* better not add ourselves here. */ |
|
if ((peer_req->flags & (EE_TRIM|EE_WRITE_SAME|EE_ZEROOUT)) == 0) |
|
list_add_tail(&peer_req->w.list, &device->active_ee); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
if (device->state.conn == C_SYNC_TARGET) |
|
wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req)); |
|
|
|
if (device->state.pdsk < D_INCONSISTENT) { |
|
/* In case we have the only disk of the cluster, */ |
|
drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size); |
|
peer_req->flags &= ~EE_MAY_SET_IN_SYNC; |
|
drbd_al_begin_io(device, &peer_req->i); |
|
peer_req->flags |= EE_CALL_AL_COMPLETE_IO; |
|
} |
|
|
|
err = drbd_submit_peer_request(device, peer_req, op, op_flags, |
|
DRBD_FAULT_DT_WR); |
|
if (!err) |
|
return 0; |
|
|
|
/* don't care for the reason here */ |
|
drbd_err(device, "submit failed, triggering re-connect\n"); |
|
spin_lock_irq(&device->resource->req_lock); |
|
list_del(&peer_req->w.list); |
|
drbd_remove_epoch_entry_interval(device, peer_req); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) { |
|
peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
|
drbd_al_complete_io(device, &peer_req->i); |
|
} |
|
|
|
out_interrupted: |
|
drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT | EV_CLEANUP); |
|
put_ldev(device); |
|
drbd_free_peer_req(device, peer_req); |
|
return err; |
|
} |
|
|
|
/* We may throttle resync, if the lower device seems to be busy, |
|
* and current sync rate is above c_min_rate. |
|
* |
|
* To decide whether or not the lower device is busy, we use a scheme similar |
|
* to MD RAID is_mddev_idle(): if the partition stats reveal "significant" |
|
* (more than 64 sectors) of activity we cannot account for with our own resync |
|
* activity, it obviously is "busy". |
|
* |
|
* The current sync rate used here uses only the most recent two step marks, |
|
* to have a short time average so we can react faster. |
|
*/ |
|
bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, |
|
bool throttle_if_app_is_waiting) |
|
{ |
|
struct lc_element *tmp; |
|
bool throttle = drbd_rs_c_min_rate_throttle(device); |
|
|
|
if (!throttle || throttle_if_app_is_waiting) |
|
return throttle; |
|
|
|
spin_lock_irq(&device->al_lock); |
|
tmp = lc_find(device->resync, BM_SECT_TO_EXT(sector)); |
|
if (tmp) { |
|
struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); |
|
if (test_bit(BME_PRIORITY, &bm_ext->flags)) |
|
throttle = false; |
|
/* Do not slow down if app IO is already waiting for this extent, |
|
* and our progress is necessary for application IO to complete. */ |
|
} |
|
spin_unlock_irq(&device->al_lock); |
|
|
|
return throttle; |
|
} |
|
|
|
bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) |
|
{ |
|
struct gendisk *disk = device->ldev->backing_bdev->bd_disk; |
|
unsigned long db, dt, dbdt; |
|
unsigned int c_min_rate; |
|
int curr_events; |
|
|
|
rcu_read_lock(); |
|
c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate; |
|
rcu_read_unlock(); |
|
|
|
/* feature disabled? */ |
|
if (c_min_rate == 0) |
|
return false; |
|
|
|
curr_events = (int)part_stat_read_accum(disk->part0, sectors) - |
|
atomic_read(&device->rs_sect_ev); |
|
|
|
if (atomic_read(&device->ap_actlog_cnt) |
|
|| curr_events - device->rs_last_events > 64) { |
|
unsigned long rs_left; |
|
int i; |
|
|
|
device->rs_last_events = curr_events; |
|
|
|
/* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, |
|
* approx. */ |
|
i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
|
|
|
if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
|
rs_left = device->ov_left; |
|
else |
|
rs_left = drbd_bm_total_weight(device) - device->rs_failed; |
|
|
|
dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ; |
|
if (!dt) |
|
dt++; |
|
db = device->rs_mark_left[i] - rs_left; |
|
dbdt = Bit2KB(db/dt); |
|
|
|
if (dbdt > c_min_rate) |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
sector_t sector; |
|
sector_t capacity; |
|
struct drbd_peer_request *peer_req; |
|
struct digest_info *di = NULL; |
|
int size, verb; |
|
unsigned int fault_type; |
|
struct p_block_req *p = pi->data; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
capacity = get_capacity(device->vdisk); |
|
|
|
sector = be64_to_cpu(p->sector); |
|
size = be32_to_cpu(p->blksize); |
|
|
|
if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
|
drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
|
(unsigned long long)sector, size); |
|
return -EINVAL; |
|
} |
|
if (sector + (size>>9) > capacity) { |
|
drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
|
(unsigned long long)sector, size); |
|
return -EINVAL; |
|
} |
|
|
|
if (!get_ldev_if_state(device, D_UP_TO_DATE)) { |
|
verb = 1; |
|
switch (pi->cmd) { |
|
case P_DATA_REQUEST: |
|
drbd_send_ack_rp(peer_device, P_NEG_DREPLY, p); |
|
break; |
|
case P_RS_THIN_REQ: |
|
case P_RS_DATA_REQUEST: |
|
case P_CSUM_RS_REQUEST: |
|
case P_OV_REQUEST: |
|
drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , p); |
|
break; |
|
case P_OV_REPLY: |
|
verb = 0; |
|
dec_rs_pending(device); |
|
drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, ID_IN_SYNC); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
if (verb && __ratelimit(&drbd_ratelimit_state)) |
|
drbd_err(device, "Can not satisfy peer's read request, " |
|
"no local data.\n"); |
|
|
|
/* drain possibly payload */ |
|
return drbd_drain_block(peer_device, pi->size); |
|
} |
|
|
|
/* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
|
* "criss-cross" setup, that might cause write-out on some other DRBD, |
|
* which in turn might block on the other node at this very place. */ |
|
peer_req = drbd_alloc_peer_req(peer_device, p->block_id, sector, size, |
|
size, GFP_NOIO); |
|
if (!peer_req) { |
|
put_ldev(device); |
|
return -ENOMEM; |
|
} |
|
|
|
switch (pi->cmd) { |
|
case P_DATA_REQUEST: |
|
peer_req->w.cb = w_e_end_data_req; |
|
fault_type = DRBD_FAULT_DT_RD; |
|
/* application IO, don't drbd_rs_begin_io */ |
|
peer_req->flags |= EE_APPLICATION; |
|
goto submit; |
|
|
|
case P_RS_THIN_REQ: |
|
/* If at some point in the future we have a smart way to |
|
find out if this data block is completely deallocated, |
|
then we would do something smarter here than reading |
|
the block... */ |
|
peer_req->flags |= EE_RS_THIN_REQ; |
|
fallthrough; |
|
case P_RS_DATA_REQUEST: |
|
peer_req->w.cb = w_e_end_rsdata_req; |
|
fault_type = DRBD_FAULT_RS_RD; |
|
/* used in the sector offset progress display */ |
|
device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
|
break; |
|
|
|
case P_OV_REPLY: |
|
case P_CSUM_RS_REQUEST: |
|
fault_type = DRBD_FAULT_RS_RD; |
|
di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
|
if (!di) |
|
goto out_free_e; |
|
|
|
di->digest_size = pi->size; |
|
di->digest = (((char *)di)+sizeof(struct digest_info)); |
|
|
|
peer_req->digest = di; |
|
peer_req->flags |= EE_HAS_DIGEST; |
|
|
|
if (drbd_recv_all(peer_device->connection, di->digest, pi->size)) |
|
goto out_free_e; |
|
|
|
if (pi->cmd == P_CSUM_RS_REQUEST) { |
|
D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
|
peer_req->w.cb = w_e_end_csum_rs_req; |
|
/* used in the sector offset progress display */ |
|
device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
|
/* remember to report stats in drbd_resync_finished */ |
|
device->use_csums = true; |
|
} else if (pi->cmd == P_OV_REPLY) { |
|
/* track progress, we may need to throttle */ |
|
atomic_add(size >> 9, &device->rs_sect_in); |
|
peer_req->w.cb = w_e_end_ov_reply; |
|
dec_rs_pending(device); |
|
/* drbd_rs_begin_io done when we sent this request, |
|
* but accounting still needs to be done. */ |
|
goto submit_for_resync; |
|
} |
|
break; |
|
|
|
case P_OV_REQUEST: |
|
if (device->ov_start_sector == ~(sector_t)0 && |
|
peer_device->connection->agreed_pro_version >= 90) { |
|
unsigned long now = jiffies; |
|
int i; |
|
device->ov_start_sector = sector; |
|
device->ov_position = sector; |
|
device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector); |
|
device->rs_total = device->ov_left; |
|
for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
|
device->rs_mark_left[i] = device->ov_left; |
|
device->rs_mark_time[i] = now; |
|
} |
|
drbd_info(device, "Online Verify start sector: %llu\n", |
|
(unsigned long long)sector); |
|
} |
|
peer_req->w.cb = w_e_end_ov_req; |
|
fault_type = DRBD_FAULT_RS_RD; |
|
break; |
|
|
|
default: |
|
BUG(); |
|
} |
|
|
|
/* Throttle, drbd_rs_begin_io and submit should become asynchronous |
|
* wrt the receiver, but it is not as straightforward as it may seem. |
|
* Various places in the resync start and stop logic assume resync |
|
* requests are processed in order, requeuing this on the worker thread |
|
* introduces a bunch of new code for synchronization between threads. |
|
* |
|
* Unlimited throttling before drbd_rs_begin_io may stall the resync |
|
* "forever", throttling after drbd_rs_begin_io will lock that extent |
|
* for application writes for the same time. For now, just throttle |
|
* here, where the rest of the code expects the receiver to sleep for |
|
* a while, anyways. |
|
*/ |
|
|
|
/* Throttle before drbd_rs_begin_io, as that locks out application IO; |
|
* this defers syncer requests for some time, before letting at least |
|
* on request through. The resync controller on the receiving side |
|
* will adapt to the incoming rate accordingly. |
|
* |
|
* We cannot throttle here if remote is Primary/SyncTarget: |
|
* we would also throttle its application reads. |
|
* In that case, throttling is done on the SyncTarget only. |
|
*/ |
|
|
|
/* Even though this may be a resync request, we do add to "read_ee"; |
|
* "sync_ee" is only used for resync WRITEs. |
|
* Add to list early, so debugfs can find this request |
|
* even if we have to sleep below. */ |
|
spin_lock_irq(&device->resource->req_lock); |
|
list_add_tail(&peer_req->w.list, &device->read_ee); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
update_receiver_timing_details(connection, drbd_rs_should_slow_down); |
|
if (device->state.peer != R_PRIMARY |
|
&& drbd_rs_should_slow_down(device, sector, false)) |
|
schedule_timeout_uninterruptible(HZ/10); |
|
update_receiver_timing_details(connection, drbd_rs_begin_io); |
|
if (drbd_rs_begin_io(device, sector)) |
|
goto out_free_e; |
|
|
|
submit_for_resync: |
|
atomic_add(size >> 9, &device->rs_sect_ev); |
|
|
|
submit: |
|
update_receiver_timing_details(connection, drbd_submit_peer_request); |
|
inc_unacked(device); |
|
if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, 0, |
|
fault_type) == 0) |
|
return 0; |
|
|
|
/* don't care for the reason here */ |
|
drbd_err(device, "submit failed, triggering re-connect\n"); |
|
|
|
out_free_e: |
|
spin_lock_irq(&device->resource->req_lock); |
|
list_del(&peer_req->w.list); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
/* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
|
|
|
put_ldev(device); |
|
drbd_free_peer_req(device, peer_req); |
|
return -EIO; |
|
} |
|
|
|
/* |
|
* drbd_asb_recover_0p - Recover after split-brain with no remaining primaries |
|
*/ |
|
static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
int self, peer, rv = -100; |
|
unsigned long ch_self, ch_peer; |
|
enum drbd_after_sb_p after_sb_0p; |
|
|
|
self = device->ldev->md.uuid[UI_BITMAP] & 1; |
|
peer = device->p_uuid[UI_BITMAP] & 1; |
|
|
|
ch_peer = device->p_uuid[UI_SIZE]; |
|
ch_self = device->comm_bm_set; |
|
|
|
rcu_read_lock(); |
|
after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p; |
|
rcu_read_unlock(); |
|
switch (after_sb_0p) { |
|
case ASB_CONSENSUS: |
|
case ASB_DISCARD_SECONDARY: |
|
case ASB_CALL_HELPER: |
|
case ASB_VIOLENTLY: |
|
drbd_err(device, "Configuration error.\n"); |
|
break; |
|
case ASB_DISCONNECT: |
|
break; |
|
case ASB_DISCARD_YOUNGER_PRI: |
|
if (self == 0 && peer == 1) { |
|
rv = -1; |
|
break; |
|
} |
|
if (self == 1 && peer == 0) { |
|
rv = 1; |
|
break; |
|
} |
|
fallthrough; /* to one of the other strategies */ |
|
case ASB_DISCARD_OLDER_PRI: |
|
if (self == 0 && peer == 1) { |
|
rv = 1; |
|
break; |
|
} |
|
if (self == 1 && peer == 0) { |
|
rv = -1; |
|
break; |
|
} |
|
/* Else fall through to one of the other strategies... */ |
|
drbd_warn(device, "Discard younger/older primary did not find a decision\n" |
|
"Using discard-least-changes instead\n"); |
|
fallthrough; |
|
case ASB_DISCARD_ZERO_CHG: |
|
if (ch_peer == 0 && ch_self == 0) { |
|
rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
|
? -1 : 1; |
|
break; |
|
} else { |
|
if (ch_peer == 0) { rv = 1; break; } |
|
if (ch_self == 0) { rv = -1; break; } |
|
} |
|
if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
|
break; |
|
fallthrough; |
|
case ASB_DISCARD_LEAST_CHG: |
|
if (ch_self < ch_peer) |
|
rv = -1; |
|
else if (ch_self > ch_peer) |
|
rv = 1; |
|
else /* ( ch_self == ch_peer ) */ |
|
/* Well, then use something else. */ |
|
rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
|
? -1 : 1; |
|
break; |
|
case ASB_DISCARD_LOCAL: |
|
rv = -1; |
|
break; |
|
case ASB_DISCARD_REMOTE: |
|
rv = 1; |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
/* |
|
* drbd_asb_recover_1p - Recover after split-brain with one remaining primary |
|
*/ |
|
static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
int hg, rv = -100; |
|
enum drbd_after_sb_p after_sb_1p; |
|
|
|
rcu_read_lock(); |
|
after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p; |
|
rcu_read_unlock(); |
|
switch (after_sb_1p) { |
|
case ASB_DISCARD_YOUNGER_PRI: |
|
case ASB_DISCARD_OLDER_PRI: |
|
case ASB_DISCARD_LEAST_CHG: |
|
case ASB_DISCARD_LOCAL: |
|
case ASB_DISCARD_REMOTE: |
|
case ASB_DISCARD_ZERO_CHG: |
|
drbd_err(device, "Configuration error.\n"); |
|
break; |
|
case ASB_DISCONNECT: |
|
break; |
|
case ASB_CONSENSUS: |
|
hg = drbd_asb_recover_0p(peer_device); |
|
if (hg == -1 && device->state.role == R_SECONDARY) |
|
rv = hg; |
|
if (hg == 1 && device->state.role == R_PRIMARY) |
|
rv = hg; |
|
break; |
|
case ASB_VIOLENTLY: |
|
rv = drbd_asb_recover_0p(peer_device); |
|
break; |
|
case ASB_DISCARD_SECONDARY: |
|
return device->state.role == R_PRIMARY ? 1 : -1; |
|
case ASB_CALL_HELPER: |
|
hg = drbd_asb_recover_0p(peer_device); |
|
if (hg == -1 && device->state.role == R_PRIMARY) { |
|
enum drbd_state_rv rv2; |
|
|
|
/* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
|
* we might be here in C_WF_REPORT_PARAMS which is transient. |
|
* we do not need to wait for the after state change work either. */ |
|
rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
|
if (rv2 != SS_SUCCESS) { |
|
drbd_khelper(device, "pri-lost-after-sb"); |
|
} else { |
|
drbd_warn(device, "Successfully gave up primary role.\n"); |
|
rv = hg; |
|
} |
|
} else |
|
rv = hg; |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
/* |
|
* drbd_asb_recover_2p - Recover after split-brain with two remaining primaries |
|
*/ |
|
static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
int hg, rv = -100; |
|
enum drbd_after_sb_p after_sb_2p; |
|
|
|
rcu_read_lock(); |
|
after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p; |
|
rcu_read_unlock(); |
|
switch (after_sb_2p) { |
|
case ASB_DISCARD_YOUNGER_PRI: |
|
case ASB_DISCARD_OLDER_PRI: |
|
case ASB_DISCARD_LEAST_CHG: |
|
case ASB_DISCARD_LOCAL: |
|
case ASB_DISCARD_REMOTE: |
|
case ASB_CONSENSUS: |
|
case ASB_DISCARD_SECONDARY: |
|
case ASB_DISCARD_ZERO_CHG: |
|
drbd_err(device, "Configuration error.\n"); |
|
break; |
|
case ASB_VIOLENTLY: |
|
rv = drbd_asb_recover_0p(peer_device); |
|
break; |
|
case ASB_DISCONNECT: |
|
break; |
|
case ASB_CALL_HELPER: |
|
hg = drbd_asb_recover_0p(peer_device); |
|
if (hg == -1) { |
|
enum drbd_state_rv rv2; |
|
|
|
/* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
|
* we might be here in C_WF_REPORT_PARAMS which is transient. |
|
* we do not need to wait for the after state change work either. */ |
|
rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
|
if (rv2 != SS_SUCCESS) { |
|
drbd_khelper(device, "pri-lost-after-sb"); |
|
} else { |
|
drbd_warn(device, "Successfully gave up primary role.\n"); |
|
rv = hg; |
|
} |
|
} else |
|
rv = hg; |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid, |
|
u64 bits, u64 flags) |
|
{ |
|
if (!uuid) { |
|
drbd_info(device, "%s uuid info vanished while I was looking!\n", text); |
|
return; |
|
} |
|
drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", |
|
text, |
|
(unsigned long long)uuid[UI_CURRENT], |
|
(unsigned long long)uuid[UI_BITMAP], |
|
(unsigned long long)uuid[UI_HISTORY_START], |
|
(unsigned long long)uuid[UI_HISTORY_END], |
|
(unsigned long long)bits, |
|
(unsigned long long)flags); |
|
} |
|
|
|
/* |
|
100 after split brain try auto recover |
|
2 C_SYNC_SOURCE set BitMap |
|
1 C_SYNC_SOURCE use BitMap |
|
0 no Sync |
|
-1 C_SYNC_TARGET use BitMap |
|
-2 C_SYNC_TARGET set BitMap |
|
-100 after split brain, disconnect |
|
-1000 unrelated data |
|
-1091 requires proto 91 |
|
-1096 requires proto 96 |
|
*/ |
|
|
|
static int drbd_uuid_compare(struct drbd_device *const device, enum drbd_role const peer_role, int *rule_nr) __must_hold(local) |
|
{ |
|
struct drbd_peer_device *const peer_device = first_peer_device(device); |
|
struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL; |
|
u64 self, peer; |
|
int i, j; |
|
|
|
self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
|
peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
|
|
|
*rule_nr = 10; |
|
if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) |
|
return 0; |
|
|
|
*rule_nr = 20; |
|
if ((self == UUID_JUST_CREATED || self == (u64)0) && |
|
peer != UUID_JUST_CREATED) |
|
return -2; |
|
|
|
*rule_nr = 30; |
|
if (self != UUID_JUST_CREATED && |
|
(peer == UUID_JUST_CREATED || peer == (u64)0)) |
|
return 2; |
|
|
|
if (self == peer) { |
|
int rct, dc; /* roles at crash time */ |
|
|
|
if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) { |
|
|
|
if (connection->agreed_pro_version < 91) |
|
return -1091; |
|
|
|
if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) && |
|
(device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { |
|
drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n"); |
|
drbd_uuid_move_history(device); |
|
device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP]; |
|
device->ldev->md.uuid[UI_BITMAP] = 0; |
|
|
|
drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
|
device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); |
|
*rule_nr = 34; |
|
} else { |
|
drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n"); |
|
*rule_nr = 36; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) { |
|
|
|
if (connection->agreed_pro_version < 91) |
|
return -1091; |
|
|
|
if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) && |
|
(device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) { |
|
drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); |
|
|
|
device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START]; |
|
device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP]; |
|
device->p_uuid[UI_BITMAP] = 0UL; |
|
|
|
drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
|
*rule_nr = 35; |
|
} else { |
|
drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n"); |
|
*rule_nr = 37; |
|
} |
|
|
|
return -1; |
|
} |
|
|
|
/* Common power [off|failure] */ |
|
rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) + |
|
(device->p_uuid[UI_FLAGS] & 2); |
|
/* lowest bit is set when we were primary, |
|
* next bit (weight 2) is set when peer was primary */ |
|
*rule_nr = 40; |
|
|
|
/* Neither has the "crashed primary" flag set, |
|
* only a replication link hickup. */ |
|
if (rct == 0) |
|
return 0; |
|
|
|
/* Current UUID equal and no bitmap uuid; does not necessarily |
|
* mean this was a "simultaneous hard crash", maybe IO was |
|
* frozen, so no UUID-bump happened. |
|
* This is a protocol change, overload DRBD_FF_WSAME as flag |
|
* for "new-enough" peer DRBD version. */ |
|
if (device->state.role == R_PRIMARY || peer_role == R_PRIMARY) { |
|
*rule_nr = 41; |
|
if (!(connection->agreed_features & DRBD_FF_WSAME)) { |
|
drbd_warn(peer_device, "Equivalent unrotated UUIDs, but current primary present.\n"); |
|
return -(0x10000 | PRO_VERSION_MAX | (DRBD_FF_WSAME << 8)); |
|
} |
|
if (device->state.role == R_PRIMARY && peer_role == R_PRIMARY) { |
|
/* At least one has the "crashed primary" bit set, |
|
* both are primary now, but neither has rotated its UUIDs? |
|
* "Can not happen." */ |
|
drbd_err(peer_device, "Equivalent unrotated UUIDs, but both are primary. Can not resolve this.\n"); |
|
return -100; |
|
} |
|
if (device->state.role == R_PRIMARY) |
|
return 1; |
|
return -1; |
|
} |
|
|
|
/* Both are secondary. |
|
* Really looks like recovery from simultaneous hard crash. |
|
* Check which had been primary before, and arbitrate. */ |
|
switch (rct) { |
|
case 0: /* !self_pri && !peer_pri */ return 0; /* already handled */ |
|
case 1: /* self_pri && !peer_pri */ return 1; |
|
case 2: /* !self_pri && peer_pri */ return -1; |
|
case 3: /* self_pri && peer_pri */ |
|
dc = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
|
return dc ? -1 : 1; |
|
} |
|
} |
|
|
|
*rule_nr = 50; |
|
peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
|
if (self == peer) |
|
return -1; |
|
|
|
*rule_nr = 51; |
|
peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1); |
|
if (self == peer) { |
|
if (connection->agreed_pro_version < 96 ? |
|
(device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
|
(device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : |
|
peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) { |
|
/* The last P_SYNC_UUID did not get though. Undo the last start of |
|
resync as sync source modifications of the peer's UUIDs. */ |
|
|
|
if (connection->agreed_pro_version < 91) |
|
return -1091; |
|
|
|
device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START]; |
|
device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1]; |
|
|
|
drbd_info(device, "Lost last syncUUID packet, corrected:\n"); |
|
drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
|
|
|
return -1; |
|
} |
|
} |
|
|
|
*rule_nr = 60; |
|
self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
|
for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
|
peer = device->p_uuid[i] & ~((u64)1); |
|
if (self == peer) |
|
return -2; |
|
} |
|
|
|
*rule_nr = 70; |
|
self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
|
peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
|
if (self == peer) |
|
return 1; |
|
|
|
*rule_nr = 71; |
|
self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
|
if (self == peer) { |
|
if (connection->agreed_pro_version < 96 ? |
|
(device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
|
(device->p_uuid[UI_HISTORY_START] & ~((u64)1)) : |
|
self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { |
|
/* The last P_SYNC_UUID did not get though. Undo the last start of |
|
resync as sync source modifications of our UUIDs. */ |
|
|
|
if (connection->agreed_pro_version < 91) |
|
return -1091; |
|
|
|
__drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]); |
|
__drbd_uuid_set(device, UI_HISTORY_START, device->ldev->md.uuid[UI_HISTORY_START + 1]); |
|
|
|
drbd_info(device, "Last syncUUID did not get through, corrected:\n"); |
|
drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
|
device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); |
|
|
|
return 1; |
|
} |
|
} |
|
|
|
|
|
*rule_nr = 80; |
|
peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
|
for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
|
self = device->ldev->md.uuid[i] & ~((u64)1); |
|
if (self == peer) |
|
return 2; |
|
} |
|
|
|
*rule_nr = 90; |
|
self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
|
peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
|
if (self == peer && self != ((u64)0)) |
|
return 100; |
|
|
|
*rule_nr = 100; |
|
for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
|
self = device->ldev->md.uuid[i] & ~((u64)1); |
|
for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { |
|
peer = device->p_uuid[j] & ~((u64)1); |
|
if (self == peer) |
|
return -100; |
|
} |
|
} |
|
|
|
return -1000; |
|
} |
|
|
|
/* drbd_sync_handshake() returns the new conn state on success, or |
|
CONN_MASK (-1) on failure. |
|
*/ |
|
static enum drbd_conns drbd_sync_handshake(struct drbd_peer_device *peer_device, |
|
enum drbd_role peer_role, |
|
enum drbd_disk_state peer_disk) __must_hold(local) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
enum drbd_conns rv = C_MASK; |
|
enum drbd_disk_state mydisk; |
|
struct net_conf *nc; |
|
int hg, rule_nr, rr_conflict, tentative, always_asbp; |
|
|
|
mydisk = device->state.disk; |
|
if (mydisk == D_NEGOTIATING) |
|
mydisk = device->new_state_tmp.disk; |
|
|
|
drbd_info(device, "drbd_sync_handshake:\n"); |
|
|
|
spin_lock_irq(&device->ldev->md.uuid_lock); |
|
drbd_uuid_dump(device, "self", device->ldev->md.uuid, device->comm_bm_set, 0); |
|
drbd_uuid_dump(device, "peer", device->p_uuid, |
|
device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
|
|
|
hg = drbd_uuid_compare(device, peer_role, &rule_nr); |
|
spin_unlock_irq(&device->ldev->md.uuid_lock); |
|
|
|
drbd_info(device, "uuid_compare()=%d by rule %d\n", hg, rule_nr); |
|
|
|
if (hg == -1000) { |
|
drbd_alert(device, "Unrelated data, aborting!\n"); |
|
return C_MASK; |
|
} |
|
if (hg < -0x10000) { |
|
int proto, fflags; |
|
hg = -hg; |
|
proto = hg & 0xff; |
|
fflags = (hg >> 8) & 0xff; |
|
drbd_alert(device, "To resolve this both sides have to support at least protocol %d and feature flags 0x%x\n", |
|
proto, fflags); |
|
return C_MASK; |
|
} |
|
if (hg < -1000) { |
|
drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); |
|
return C_MASK; |
|
} |
|
|
|
if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || |
|
(peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { |
|
int f = (hg == -100) || abs(hg) == 2; |
|
hg = mydisk > D_INCONSISTENT ? 1 : -1; |
|
if (f) |
|
hg = hg*2; |
|
drbd_info(device, "Becoming sync %s due to disk states.\n", |
|
hg > 0 ? "source" : "target"); |
|
} |
|
|
|
if (abs(hg) == 100) |
|
drbd_khelper(device, "initial-split-brain"); |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(peer_device->connection->net_conf); |
|
always_asbp = nc->always_asbp; |
|
rr_conflict = nc->rr_conflict; |
|
tentative = nc->tentative; |
|
rcu_read_unlock(); |
|
|
|
if (hg == 100 || (hg == -100 && always_asbp)) { |
|
int pcount = (device->state.role == R_PRIMARY) |
|
+ (peer_role == R_PRIMARY); |
|
int forced = (hg == -100); |
|
|
|
switch (pcount) { |
|
case 0: |
|
hg = drbd_asb_recover_0p(peer_device); |
|
break; |
|
case 1: |
|
hg = drbd_asb_recover_1p(peer_device); |
|
break; |
|
case 2: |
|
hg = drbd_asb_recover_2p(peer_device); |
|
break; |
|
} |
|
if (abs(hg) < 100) { |
|
drbd_warn(device, "Split-Brain detected, %d primaries, " |
|
"automatically solved. Sync from %s node\n", |
|
pcount, (hg < 0) ? "peer" : "this"); |
|
if (forced) { |
|
drbd_warn(device, "Doing a full sync, since" |
|
" UUIDs where ambiguous.\n"); |
|
hg = hg*2; |
|
} |
|
} |
|
} |
|
|
|
if (hg == -100) { |
|
if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1)) |
|
hg = -1; |
|
if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1)) |
|
hg = 1; |
|
|
|
if (abs(hg) < 100) |
|
drbd_warn(device, "Split-Brain detected, manually solved. " |
|
"Sync from %s node\n", |
|
(hg < 0) ? "peer" : "this"); |
|
} |
|
|
|
if (hg == -100) { |
|
/* FIXME this log message is not correct if we end up here |
|
* after an attempted attach on a diskless node. |
|
* We just refuse to attach -- well, we drop the "connection" |
|
* to that disk, in a way... */ |
|
drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n"); |
|
drbd_khelper(device, "split-brain"); |
|
return C_MASK; |
|
} |
|
|
|
if (hg > 0 && mydisk <= D_INCONSISTENT) { |
|
drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n"); |
|
return C_MASK; |
|
} |
|
|
|
if (hg < 0 && /* by intention we do not use mydisk here. */ |
|
device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) { |
|
switch (rr_conflict) { |
|
case ASB_CALL_HELPER: |
|
drbd_khelper(device, "pri-lost"); |
|
fallthrough; |
|
case ASB_DISCONNECT: |
|
drbd_err(device, "I shall become SyncTarget, but I am primary!\n"); |
|
return C_MASK; |
|
case ASB_VIOLENTLY: |
|
drbd_warn(device, "Becoming SyncTarget, violating the stable-data" |
|
"assumption\n"); |
|
} |
|
} |
|
|
|
if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) { |
|
if (hg == 0) |
|
drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n"); |
|
else |
|
drbd_info(device, "dry-run connect: Would become %s, doing a %s resync.", |
|
drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), |
|
abs(hg) >= 2 ? "full" : "bit-map based"); |
|
return C_MASK; |
|
} |
|
|
|
if (abs(hg) >= 2) { |
|
drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); |
|
if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
|
BM_LOCKED_SET_ALLOWED)) |
|
return C_MASK; |
|
} |
|
|
|
if (hg > 0) { /* become sync source. */ |
|
rv = C_WF_BITMAP_S; |
|
} else if (hg < 0) { /* become sync target */ |
|
rv = C_WF_BITMAP_T; |
|
} else { |
|
rv = C_CONNECTED; |
|
if (drbd_bm_total_weight(device)) { |
|
drbd_info(device, "No resync, but %lu bits in bitmap!\n", |
|
drbd_bm_total_weight(device)); |
|
} |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
|
{ |
|
/* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ |
|
if (peer == ASB_DISCARD_REMOTE) |
|
return ASB_DISCARD_LOCAL; |
|
|
|
/* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ |
|
if (peer == ASB_DISCARD_LOCAL) |
|
return ASB_DISCARD_REMOTE; |
|
|
|
/* everything else is valid if they are equal on both sides. */ |
|
return peer; |
|
} |
|
|
|
static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct p_protocol *p = pi->data; |
|
enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
|
int p_proto, p_discard_my_data, p_two_primaries, cf; |
|
struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; |
|
char integrity_alg[SHARED_SECRET_MAX] = ""; |
|
struct crypto_shash *peer_integrity_tfm = NULL; |
|
void *int_dig_in = NULL, *int_dig_vv = NULL; |
|
|
|
p_proto = be32_to_cpu(p->protocol); |
|
p_after_sb_0p = be32_to_cpu(p->after_sb_0p); |
|
p_after_sb_1p = be32_to_cpu(p->after_sb_1p); |
|
p_after_sb_2p = be32_to_cpu(p->after_sb_2p); |
|
p_two_primaries = be32_to_cpu(p->two_primaries); |
|
cf = be32_to_cpu(p->conn_flags); |
|
p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
|
|
|
if (connection->agreed_pro_version >= 87) { |
|
int err; |
|
|
|
if (pi->size > sizeof(integrity_alg)) |
|
return -EIO; |
|
err = drbd_recv_all(connection, integrity_alg, pi->size); |
|
if (err) |
|
return err; |
|
integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
|
} |
|
|
|
if (pi->cmd != P_PROTOCOL_UPDATE) { |
|
clear_bit(CONN_DRY_RUN, &connection->flags); |
|
|
|
if (cf & CF_DRY_RUN) |
|
set_bit(CONN_DRY_RUN, &connection->flags); |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
|
|
if (p_proto != nc->wire_protocol) { |
|
drbd_err(connection, "incompatible %s settings\n", "protocol"); |
|
goto disconnect_rcu_unlock; |
|
} |
|
|
|
if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
|
drbd_err(connection, "incompatible %s settings\n", "after-sb-0pri"); |
|
goto disconnect_rcu_unlock; |
|
} |
|
|
|
if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
|
drbd_err(connection, "incompatible %s settings\n", "after-sb-1pri"); |
|
goto disconnect_rcu_unlock; |
|
} |
|
|
|
if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
|
drbd_err(connection, "incompatible %s settings\n", "after-sb-2pri"); |
|
goto disconnect_rcu_unlock; |
|
} |
|
|
|
if (p_discard_my_data && nc->discard_my_data) { |
|
drbd_err(connection, "incompatible %s settings\n", "discard-my-data"); |
|
goto disconnect_rcu_unlock; |
|
} |
|
|
|
if (p_two_primaries != nc->two_primaries) { |
|
drbd_err(connection, "incompatible %s settings\n", "allow-two-primaries"); |
|
goto disconnect_rcu_unlock; |
|
} |
|
|
|
if (strcmp(integrity_alg, nc->integrity_alg)) { |
|
drbd_err(connection, "incompatible %s settings\n", "data-integrity-alg"); |
|
goto disconnect_rcu_unlock; |
|
} |
|
|
|
rcu_read_unlock(); |
|
} |
|
|
|
if (integrity_alg[0]) { |
|
int hash_size; |
|
|
|
/* |
|
* We can only change the peer data integrity algorithm |
|
* here. Changing our own data integrity algorithm |
|
* requires that we send a P_PROTOCOL_UPDATE packet at |
|
* the same time; otherwise, the peer has no way to |
|
* tell between which packets the algorithm should |
|
* change. |
|
*/ |
|
|
|
peer_integrity_tfm = crypto_alloc_shash(integrity_alg, 0, 0); |
|
if (IS_ERR(peer_integrity_tfm)) { |
|
peer_integrity_tfm = NULL; |
|
drbd_err(connection, "peer data-integrity-alg %s not supported\n", |
|
integrity_alg); |
|
goto disconnect; |
|
} |
|
|
|
hash_size = crypto_shash_digestsize(peer_integrity_tfm); |
|
int_dig_in = kmalloc(hash_size, GFP_KERNEL); |
|
int_dig_vv = kmalloc(hash_size, GFP_KERNEL); |
|
if (!(int_dig_in && int_dig_vv)) { |
|
drbd_err(connection, "Allocation of buffers for data integrity checking failed\n"); |
|
goto disconnect; |
|
} |
|
} |
|
|
|
new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); |
|
if (!new_net_conf) |
|
goto disconnect; |
|
|
|
mutex_lock(&connection->data.mutex); |
|
mutex_lock(&connection->resource->conf_update); |
|
old_net_conf = connection->net_conf; |
|
*new_net_conf = *old_net_conf; |
|
|
|
new_net_conf->wire_protocol = p_proto; |
|
new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); |
|
new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); |
|
new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); |
|
new_net_conf->two_primaries = p_two_primaries; |
|
|
|
rcu_assign_pointer(connection->net_conf, new_net_conf); |
|
mutex_unlock(&connection->resource->conf_update); |
|
mutex_unlock(&connection->data.mutex); |
|
|
|
crypto_free_shash(connection->peer_integrity_tfm); |
|
kfree(connection->int_dig_in); |
|
kfree(connection->int_dig_vv); |
|
connection->peer_integrity_tfm = peer_integrity_tfm; |
|
connection->int_dig_in = int_dig_in; |
|
connection->int_dig_vv = int_dig_vv; |
|
|
|
if (strcmp(old_net_conf->integrity_alg, integrity_alg)) |
|
drbd_info(connection, "peer data-integrity-alg: %s\n", |
|
integrity_alg[0] ? integrity_alg : "(none)"); |
|
|
|
synchronize_rcu(); |
|
kfree(old_net_conf); |
|
return 0; |
|
|
|
disconnect_rcu_unlock: |
|
rcu_read_unlock(); |
|
disconnect: |
|
crypto_free_shash(peer_integrity_tfm); |
|
kfree(int_dig_in); |
|
kfree(int_dig_vv); |
|
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
return -EIO; |
|
} |
|
|
|
/* helper function |
|
* input: alg name, feature name |
|
* return: NULL (alg name was "") |
|
* ERR_PTR(error) if something goes wrong |
|
* or the crypto hash ptr, if it worked out ok. */ |
|
static struct crypto_shash *drbd_crypto_alloc_digest_safe( |
|
const struct drbd_device *device, |
|
const char *alg, const char *name) |
|
{ |
|
struct crypto_shash *tfm; |
|
|
|
if (!alg[0]) |
|
return NULL; |
|
|
|
tfm = crypto_alloc_shash(alg, 0, 0); |
|
if (IS_ERR(tfm)) { |
|
drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n", |
|
alg, name, PTR_ERR(tfm)); |
|
return tfm; |
|
} |
|
return tfm; |
|
} |
|
|
|
static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
void *buffer = connection->data.rbuf; |
|
int size = pi->size; |
|
|
|
while (size) { |
|
int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); |
|
s = drbd_recv(connection, buffer, s); |
|
if (s <= 0) { |
|
if (s < 0) |
|
return s; |
|
break; |
|
} |
|
size -= s; |
|
} |
|
if (size) |
|
return -EIO; |
|
return 0; |
|
} |
|
|
|
/* |
|
* config_unknown_volume - device configuration command for unknown volume |
|
* |
|
* When a device is added to an existing connection, the node on which the |
|
* device is added first will send configuration commands to its peer but the |
|
* peer will not know about the device yet. It will warn and ignore these |
|
* commands. Once the device is added on the second node, the second node will |
|
* send the same device configuration commands, but in the other direction. |
|
* |
|
* (We can also end up here if drbd is misconfigured.) |
|
*/ |
|
static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n", |
|
cmdname(pi->cmd), pi->vnr); |
|
return ignore_remaining_packet(connection, pi); |
|
} |
|
|
|
static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_rs_param_95 *p; |
|
unsigned int header_size, data_size, exp_max_sz; |
|
struct crypto_shash *verify_tfm = NULL; |
|
struct crypto_shash *csums_tfm = NULL; |
|
struct net_conf *old_net_conf, *new_net_conf = NULL; |
|
struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
|
const int apv = connection->agreed_pro_version; |
|
struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
|
unsigned int fifo_size = 0; |
|
int err; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return config_unknown_volume(connection, pi); |
|
device = peer_device->device; |
|
|
|
exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) |
|
: apv == 88 ? sizeof(struct p_rs_param) |
|
+ SHARED_SECRET_MAX |
|
: apv <= 94 ? sizeof(struct p_rs_param_89) |
|
: /* apv >= 95 */ sizeof(struct p_rs_param_95); |
|
|
|
if (pi->size > exp_max_sz) { |
|
drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
|
pi->size, exp_max_sz); |
|
return -EIO; |
|
} |
|
|
|
if (apv <= 88) { |
|
header_size = sizeof(struct p_rs_param); |
|
data_size = pi->size - header_size; |
|
} else if (apv <= 94) { |
|
header_size = sizeof(struct p_rs_param_89); |
|
data_size = pi->size - header_size; |
|
D_ASSERT(device, data_size == 0); |
|
} else { |
|
header_size = sizeof(struct p_rs_param_95); |
|
data_size = pi->size - header_size; |
|
D_ASSERT(device, data_size == 0); |
|
} |
|
|
|
/* initialize verify_alg and csums_alg */ |
|
p = pi->data; |
|
BUILD_BUG_ON(sizeof(p->algs) != 2 * SHARED_SECRET_MAX); |
|
memset(&p->algs, 0, sizeof(p->algs)); |
|
|
|
err = drbd_recv_all(peer_device->connection, p, header_size); |
|
if (err) |
|
return err; |
|
|
|
mutex_lock(&connection->resource->conf_update); |
|
old_net_conf = peer_device->connection->net_conf; |
|
if (get_ldev(device)) { |
|
new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
|
if (!new_disk_conf) { |
|
put_ldev(device); |
|
mutex_unlock(&connection->resource->conf_update); |
|
drbd_err(device, "Allocation of new disk_conf failed\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
old_disk_conf = device->ldev->disk_conf; |
|
*new_disk_conf = *old_disk_conf; |
|
|
|
new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
|
} |
|
|
|
if (apv >= 88) { |
|
if (apv == 88) { |
|
if (data_size > SHARED_SECRET_MAX || data_size == 0) { |
|
drbd_err(device, "verify-alg of wrong size, " |
|
"peer wants %u, accepting only up to %u byte\n", |
|
data_size, SHARED_SECRET_MAX); |
|
err = -EIO; |
|
goto reconnect; |
|
} |
|
|
|
err = drbd_recv_all(peer_device->connection, p->verify_alg, data_size); |
|
if (err) |
|
goto reconnect; |
|
/* we expect NUL terminated string */ |
|
/* but just in case someone tries to be evil */ |
|
D_ASSERT(device, p->verify_alg[data_size-1] == 0); |
|
p->verify_alg[data_size-1] = 0; |
|
|
|
} else /* apv >= 89 */ { |
|
/* we still expect NUL terminated strings */ |
|
/* but just in case someone tries to be evil */ |
|
D_ASSERT(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0); |
|
D_ASSERT(device, p->csums_alg[SHARED_SECRET_MAX-1] == 0); |
|
p->verify_alg[SHARED_SECRET_MAX-1] = 0; |
|
p->csums_alg[SHARED_SECRET_MAX-1] = 0; |
|
} |
|
|
|
if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
|
if (device->state.conn == C_WF_REPORT_PARAMS) { |
|
drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", |
|
old_net_conf->verify_alg, p->verify_alg); |
|
goto disconnect; |
|
} |
|
verify_tfm = drbd_crypto_alloc_digest_safe(device, |
|
p->verify_alg, "verify-alg"); |
|
if (IS_ERR(verify_tfm)) { |
|
verify_tfm = NULL; |
|
goto disconnect; |
|
} |
|
} |
|
|
|
if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
|
if (device->state.conn == C_WF_REPORT_PARAMS) { |
|
drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", |
|
old_net_conf->csums_alg, p->csums_alg); |
|
goto disconnect; |
|
} |
|
csums_tfm = drbd_crypto_alloc_digest_safe(device, |
|
p->csums_alg, "csums-alg"); |
|
if (IS_ERR(csums_tfm)) { |
|
csums_tfm = NULL; |
|
goto disconnect; |
|
} |
|
} |
|
|
|
if (apv > 94 && new_disk_conf) { |
|
new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
|
new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); |
|
new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); |
|
new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); |
|
|
|
fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
|
if (fifo_size != device->rs_plan_s->size) { |
|
new_plan = fifo_alloc(fifo_size); |
|
if (!new_plan) { |
|
drbd_err(device, "kmalloc of fifo_buffer failed"); |
|
put_ldev(device); |
|
goto disconnect; |
|
} |
|
} |
|
} |
|
|
|
if (verify_tfm || csums_tfm) { |
|
new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
|
if (!new_net_conf) |
|
goto disconnect; |
|
|
|
*new_net_conf = *old_net_conf; |
|
|
|
if (verify_tfm) { |
|
strcpy(new_net_conf->verify_alg, p->verify_alg); |
|
new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; |
|
crypto_free_shash(peer_device->connection->verify_tfm); |
|
peer_device->connection->verify_tfm = verify_tfm; |
|
drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg); |
|
} |
|
if (csums_tfm) { |
|
strcpy(new_net_conf->csums_alg, p->csums_alg); |
|
new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; |
|
crypto_free_shash(peer_device->connection->csums_tfm); |
|
peer_device->connection->csums_tfm = csums_tfm; |
|
drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg); |
|
} |
|
rcu_assign_pointer(connection->net_conf, new_net_conf); |
|
} |
|
} |
|
|
|
if (new_disk_conf) { |
|
rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
|
put_ldev(device); |
|
} |
|
|
|
if (new_plan) { |
|
old_plan = device->rs_plan_s; |
|
rcu_assign_pointer(device->rs_plan_s, new_plan); |
|
} |
|
|
|
mutex_unlock(&connection->resource->conf_update); |
|
synchronize_rcu(); |
|
if (new_net_conf) |
|
kfree(old_net_conf); |
|
kfree(old_disk_conf); |
|
kfree(old_plan); |
|
|
|
return 0; |
|
|
|
reconnect: |
|
if (new_disk_conf) { |
|
put_ldev(device); |
|
kfree(new_disk_conf); |
|
} |
|
mutex_unlock(&connection->resource->conf_update); |
|
return -EIO; |
|
|
|
disconnect: |
|
kfree(new_plan); |
|
if (new_disk_conf) { |
|
put_ldev(device); |
|
kfree(new_disk_conf); |
|
} |
|
mutex_unlock(&connection->resource->conf_update); |
|
/* just for completeness: actually not needed, |
|
* as this is not reached if csums_tfm was ok. */ |
|
crypto_free_shash(csums_tfm); |
|
/* but free the verify_tfm again, if csums_tfm did not work out */ |
|
crypto_free_shash(verify_tfm); |
|
conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
return -EIO; |
|
} |
|
|
|
/* warn if the arguments differ by more than 12.5% */ |
|
static void warn_if_differ_considerably(struct drbd_device *device, |
|
const char *s, sector_t a, sector_t b) |
|
{ |
|
sector_t d; |
|
if (a == 0 || b == 0) |
|
return; |
|
d = (a > b) ? (a - b) : (b - a); |
|
if (d > (a>>3) || d > (b>>3)) |
|
drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n", s, |
|
(unsigned long long)a, (unsigned long long)b); |
|
} |
|
|
|
static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_sizes *p = pi->data; |
|
struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL; |
|
enum determine_dev_size dd = DS_UNCHANGED; |
|
sector_t p_size, p_usize, p_csize, my_usize; |
|
sector_t new_size, cur_size; |
|
int ldsc = 0; /* local disk size changed */ |
|
enum dds_flags ddsf; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return config_unknown_volume(connection, pi); |
|
device = peer_device->device; |
|
cur_size = get_capacity(device->vdisk); |
|
|
|
p_size = be64_to_cpu(p->d_size); |
|
p_usize = be64_to_cpu(p->u_size); |
|
p_csize = be64_to_cpu(p->c_size); |
|
|
|
/* just store the peer's disk size for now. |
|
* we still need to figure out whether we accept that. */ |
|
device->p_size = p_size; |
|
|
|
if (get_ldev(device)) { |
|
rcu_read_lock(); |
|
my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; |
|
rcu_read_unlock(); |
|
|
|
warn_if_differ_considerably(device, "lower level device sizes", |
|
p_size, drbd_get_max_capacity(device->ldev)); |
|
warn_if_differ_considerably(device, "user requested size", |
|
p_usize, my_usize); |
|
|
|
/* if this is the first connect, or an otherwise expected |
|
* param exchange, choose the minimum */ |
|
if (device->state.conn == C_WF_REPORT_PARAMS) |
|
p_usize = min_not_zero(my_usize, p_usize); |
|
|
|
/* Never shrink a device with usable data during connect, |
|
* or "attach" on the peer. |
|
* But allow online shrinking if we are connected. */ |
|
new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0); |
|
if (new_size < cur_size && |
|
device->state.disk >= D_OUTDATED && |
|
(device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS)) { |
|
drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n", |
|
(unsigned long long)new_size, (unsigned long long)cur_size); |
|
conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
put_ldev(device); |
|
return -EIO; |
|
} |
|
|
|
if (my_usize != p_usize) { |
|
struct disk_conf *old_disk_conf, *new_disk_conf = NULL; |
|
|
|
new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
|
if (!new_disk_conf) { |
|
put_ldev(device); |
|
return -ENOMEM; |
|
} |
|
|
|
mutex_lock(&connection->resource->conf_update); |
|
old_disk_conf = device->ldev->disk_conf; |
|
*new_disk_conf = *old_disk_conf; |
|
new_disk_conf->disk_size = p_usize; |
|
|
|
rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
|
mutex_unlock(&connection->resource->conf_update); |
|
synchronize_rcu(); |
|
kfree(old_disk_conf); |
|
|
|
drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n", |
|
(unsigned long)p_usize, (unsigned long)my_usize); |
|
} |
|
|
|
put_ldev(device); |
|
} |
|
|
|
device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
|
/* Leave drbd_reconsider_queue_parameters() before drbd_determine_dev_size(). |
|
In case we cleared the QUEUE_FLAG_DISCARD from our queue in |
|
drbd_reconsider_queue_parameters(), we can be sure that after |
|
drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */ |
|
|
|
ddsf = be16_to_cpu(p->dds_flags); |
|
if (get_ldev(device)) { |
|
drbd_reconsider_queue_parameters(device, device->ldev, o); |
|
dd = drbd_determine_dev_size(device, ddsf, NULL); |
|
put_ldev(device); |
|
if (dd == DS_ERROR) |
|
return -EIO; |
|
drbd_md_sync(device); |
|
} else { |
|
/* |
|
* I am diskless, need to accept the peer's *current* size. |
|
* I must NOT accept the peers backing disk size, |
|
* it may have been larger than mine all along... |
|
* |
|
* At this point, the peer knows more about my disk, or at |
|
* least about what we last agreed upon, than myself. |
|
* So if his c_size is less than his d_size, the most likely |
|
* reason is that *my* d_size was smaller last time we checked. |
|
* |
|
* However, if he sends a zero current size, |
|
* take his (user-capped or) backing disk size anyways. |
|
* |
|
* Unless of course he does not have a disk himself. |
|
* In which case we ignore this completely. |
|
*/ |
|
sector_t new_size = p_csize ?: p_usize ?: p_size; |
|
drbd_reconsider_queue_parameters(device, NULL, o); |
|
if (new_size == 0) { |
|
/* Ignore, peer does not know nothing. */ |
|
} else if (new_size == cur_size) { |
|
/* nothing to do */ |
|
} else if (cur_size != 0 && p_size == 0) { |
|
drbd_warn(device, "Ignored diskless peer device size (peer:%llu != me:%llu sectors)!\n", |
|
(unsigned long long)new_size, (unsigned long long)cur_size); |
|
} else if (new_size < cur_size && device->state.role == R_PRIMARY) { |
|
drbd_err(device, "The peer's device size is too small! (%llu < %llu sectors); demote me first!\n", |
|
(unsigned long long)new_size, (unsigned long long)cur_size); |
|
conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
return -EIO; |
|
} else { |
|
/* I believe the peer, if |
|
* - I don't have a current size myself |
|
* - we agree on the size anyways |
|
* - I do have a current size, am Secondary, |
|
* and he has the only disk |
|
* - I do have a current size, am Primary, |
|
* and he has the only disk, |
|
* which is larger than my current size |
|
*/ |
|
drbd_set_my_capacity(device, new_size); |
|
} |
|
} |
|
|
|
if (get_ldev(device)) { |
|
if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) { |
|
device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev); |
|
ldsc = 1; |
|
} |
|
|
|
put_ldev(device); |
|
} |
|
|
|
if (device->state.conn > C_WF_REPORT_PARAMS) { |
|
if (be64_to_cpu(p->c_size) != get_capacity(device->vdisk) || |
|
ldsc) { |
|
/* we have different sizes, probably peer |
|
* needs to know my new size... */ |
|
drbd_send_sizes(peer_device, 0, ddsf); |
|
} |
|
if (test_and_clear_bit(RESIZE_PENDING, &device->flags) || |
|
(dd == DS_GREW && device->state.conn == C_CONNECTED)) { |
|
if (device->state.pdsk >= D_INCONSISTENT && |
|
device->state.disk >= D_INCONSISTENT) { |
|
if (ddsf & DDSF_NO_RESYNC) |
|
drbd_info(device, "Resync of new storage suppressed with --assume-clean\n"); |
|
else |
|
resync_after_online_grow(device); |
|
} else |
|
set_bit(RESYNC_AFTER_NEG, &device->flags); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_uuids *p = pi->data; |
|
u64 *p_uuid; |
|
int i, updated_uuids = 0; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return config_unknown_volume(connection, pi); |
|
device = peer_device->device; |
|
|
|
p_uuid = kmalloc_array(UI_EXTENDED_SIZE, sizeof(*p_uuid), GFP_NOIO); |
|
if (!p_uuid) |
|
return false; |
|
|
|
for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) |
|
p_uuid[i] = be64_to_cpu(p->uuid[i]); |
|
|
|
kfree(device->p_uuid); |
|
device->p_uuid = p_uuid; |
|
|
|
if ((device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS) && |
|
device->state.disk < D_INCONSISTENT && |
|
device->state.role == R_PRIMARY && |
|
(device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { |
|
drbd_err(device, "Can only connect to data with current UUID=%016llX\n", |
|
(unsigned long long)device->ed_uuid); |
|
conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
return -EIO; |
|
} |
|
|
|
if (get_ldev(device)) { |
|
int skip_initial_sync = |
|
device->state.conn == C_CONNECTED && |
|
peer_device->connection->agreed_pro_version >= 90 && |
|
device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
|
(p_uuid[UI_FLAGS] & 8); |
|
if (skip_initial_sync) { |
|
drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n"); |
|
drbd_bitmap_io(device, &drbd_bmio_clear_n_write, |
|
"clear_n_write from receive_uuids", |
|
BM_LOCKED_TEST_ALLOWED); |
|
_drbd_uuid_set(device, UI_CURRENT, p_uuid[UI_CURRENT]); |
|
_drbd_uuid_set(device, UI_BITMAP, 0); |
|
_drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), |
|
CS_VERBOSE, NULL); |
|
drbd_md_sync(device); |
|
updated_uuids = 1; |
|
} |
|
put_ldev(device); |
|
} else if (device->state.disk < D_INCONSISTENT && |
|
device->state.role == R_PRIMARY) { |
|
/* I am a diskless primary, the peer just created a new current UUID |
|
for me. */ |
|
updated_uuids = drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); |
|
} |
|
|
|
/* Before we test for the disk state, we should wait until an eventually |
|
ongoing cluster wide state change is finished. That is important if |
|
we are primary and are detaching from our disk. We need to see the |
|
new disk state... */ |
|
mutex_lock(device->state_mutex); |
|
mutex_unlock(device->state_mutex); |
|
if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT) |
|
updated_uuids |= drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); |
|
|
|
if (updated_uuids) |
|
drbd_print_uuids(device, "receiver updated UUIDs to"); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* convert_state() - Converts the peer's view of the cluster state to our point of view |
|
* @ps: The state as seen by the peer. |
|
*/ |
|
static union drbd_state convert_state(union drbd_state ps) |
|
{ |
|
union drbd_state ms; |
|
|
|
static enum drbd_conns c_tab[] = { |
|
[C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
|
[C_CONNECTED] = C_CONNECTED, |
|
|
|
[C_STARTING_SYNC_S] = C_STARTING_SYNC_T, |
|
[C_STARTING_SYNC_T] = C_STARTING_SYNC_S, |
|
[C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ |
|
[C_VERIFY_S] = C_VERIFY_T, |
|
[C_MASK] = C_MASK, |
|
}; |
|
|
|
ms.i = ps.i; |
|
|
|
ms.conn = c_tab[ps.conn]; |
|
ms.peer = ps.role; |
|
ms.role = ps.peer; |
|
ms.pdsk = ps.disk; |
|
ms.disk = ps.pdsk; |
|
ms.peer_isp = (ps.aftr_isp | ps.user_isp); |
|
|
|
return ms; |
|
} |
|
|
|
static int receive_req_state(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_req_state *p = pi->data; |
|
union drbd_state mask, val; |
|
enum drbd_state_rv rv; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
mask.i = be32_to_cpu(p->mask); |
|
val.i = be32_to_cpu(p->val); |
|
|
|
if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) && |
|
mutex_is_locked(device->state_mutex)) { |
|
drbd_send_sr_reply(peer_device, SS_CONCURRENT_ST_CHG); |
|
return 0; |
|
} |
|
|
|
mask = convert_state(mask); |
|
val = convert_state(val); |
|
|
|
rv = drbd_change_state(device, CS_VERBOSE, mask, val); |
|
drbd_send_sr_reply(peer_device, rv); |
|
|
|
drbd_md_sync(device); |
|
|
|
return 0; |
|
} |
|
|
|
static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct p_req_state *p = pi->data; |
|
union drbd_state mask, val; |
|
enum drbd_state_rv rv; |
|
|
|
mask.i = be32_to_cpu(p->mask); |
|
val.i = be32_to_cpu(p->val); |
|
|
|
if (test_bit(RESOLVE_CONFLICTS, &connection->flags) && |
|
mutex_is_locked(&connection->cstate_mutex)) { |
|
conn_send_sr_reply(connection, SS_CONCURRENT_ST_CHG); |
|
return 0; |
|
} |
|
|
|
mask = convert_state(mask); |
|
val = convert_state(val); |
|
|
|
rv = conn_request_state(connection, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
|
conn_send_sr_reply(connection, rv); |
|
|
|
return 0; |
|
} |
|
|
|
static int receive_state(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_state *p = pi->data; |
|
union drbd_state os, ns, peer_state; |
|
enum drbd_disk_state real_peer_disk; |
|
enum chg_state_flags cs_flags; |
|
int rv; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return config_unknown_volume(connection, pi); |
|
device = peer_device->device; |
|
|
|
peer_state.i = be32_to_cpu(p->state); |
|
|
|
real_peer_disk = peer_state.disk; |
|
if (peer_state.disk == D_NEGOTIATING) { |
|
real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; |
|
drbd_info(device, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); |
|
} |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
retry: |
|
os = ns = drbd_read_state(device); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
/* If some other part of the code (ack_receiver thread, timeout) |
|
* already decided to close the connection again, |
|
* we must not "re-establish" it here. */ |
|
if (os.conn <= C_TEAR_DOWN) |
|
return -ECONNRESET; |
|
|
|
/* If this is the "end of sync" confirmation, usually the peer disk |
|
* transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits |
|
* set) resync started in PausedSyncT, or if the timing of pause-/ |
|
* unpause-sync events has been "just right", the peer disk may |
|
* transition from D_CONSISTENT to D_UP_TO_DATE as well. |
|
*/ |
|
if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && |
|
real_peer_disk == D_UP_TO_DATE && |
|
os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
|
/* If we are (becoming) SyncSource, but peer is still in sync |
|
* preparation, ignore its uptodate-ness to avoid flapping, it |
|
* will change to inconsistent once the peer reaches active |
|
* syncing states. |
|
* It may have changed syncer-paused flags, however, so we |
|
* cannot ignore this completely. */ |
|
if (peer_state.conn > C_CONNECTED && |
|
peer_state.conn < C_SYNC_SOURCE) |
|
real_peer_disk = D_INCONSISTENT; |
|
|
|
/* if peer_state changes to connected at the same time, |
|
* it explicitly notifies us that it finished resync. |
|
* Maybe we should finish it up, too? */ |
|
else if (os.conn >= C_SYNC_SOURCE && |
|
peer_state.conn == C_CONNECTED) { |
|
if (drbd_bm_total_weight(device) <= device->rs_failed) |
|
drbd_resync_finished(device); |
|
return 0; |
|
} |
|
} |
|
|
|
/* explicit verify finished notification, stop sector reached. */ |
|
if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && |
|
peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { |
|
ov_out_of_sync_print(device); |
|
drbd_resync_finished(device); |
|
return 0; |
|
} |
|
|
|
/* peer says his disk is inconsistent, while we think it is uptodate, |
|
* and this happens while the peer still thinks we have a sync going on, |
|
* but we think we are already done with the sync. |
|
* We ignore this to avoid flapping pdsk. |
|
* This should not happen, if the peer is a recent version of drbd. */ |
|
if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && |
|
os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) |
|
real_peer_disk = D_UP_TO_DATE; |
|
|
|
if (ns.conn == C_WF_REPORT_PARAMS) |
|
ns.conn = C_CONNECTED; |
|
|
|
if (peer_state.conn == C_AHEAD) |
|
ns.conn = C_BEHIND; |
|
|
|
/* TODO: |
|
* if (primary and diskless and peer uuid != effective uuid) |
|
* abort attach on peer; |
|
* |
|
* If this node does not have good data, was already connected, but |
|
* the peer did a late attach only now, trying to "negotiate" with me, |
|
* AND I am currently Primary, possibly frozen, with some specific |
|
* "effective" uuid, this should never be reached, really, because |
|
* we first send the uuids, then the current state. |
|
* |
|
* In this scenario, we already dropped the connection hard |
|
* when we received the unsuitable uuids (receive_uuids(). |
|
* |
|
* Should we want to change this, that is: not drop the connection in |
|
* receive_uuids() already, then we would need to add a branch here |
|
* that aborts the attach of "unsuitable uuids" on the peer in case |
|
* this node is currently Diskless Primary. |
|
*/ |
|
|
|
if (device->p_uuid && peer_state.disk >= D_NEGOTIATING && |
|
get_ldev_if_state(device, D_NEGOTIATING)) { |
|
int cr; /* consider resync */ |
|
|
|
/* if we established a new connection */ |
|
cr = (os.conn < C_CONNECTED); |
|
/* if we had an established connection |
|
* and one of the nodes newly attaches a disk */ |
|
cr |= (os.conn == C_CONNECTED && |
|
(peer_state.disk == D_NEGOTIATING || |
|
os.disk == D_NEGOTIATING)); |
|
/* if we have both been inconsistent, and the peer has been |
|
* forced to be UpToDate with --force */ |
|
cr |= test_bit(CONSIDER_RESYNC, &device->flags); |
|
/* if we had been plain connected, and the admin requested to |
|
* start a sync by "invalidate" or "invalidate-remote" */ |
|
cr |= (os.conn == C_CONNECTED && |
|
(peer_state.conn >= C_STARTING_SYNC_S && |
|
peer_state.conn <= C_WF_BITMAP_T)); |
|
|
|
if (cr) |
|
ns.conn = drbd_sync_handshake(peer_device, peer_state.role, real_peer_disk); |
|
|
|
put_ldev(device); |
|
if (ns.conn == C_MASK) { |
|
ns.conn = C_CONNECTED; |
|
if (device->state.disk == D_NEGOTIATING) { |
|
drbd_force_state(device, NS(disk, D_FAILED)); |
|
} else if (peer_state.disk == D_NEGOTIATING) { |
|
drbd_err(device, "Disk attach process on the peer node was aborted.\n"); |
|
peer_state.disk = D_DISKLESS; |
|
real_peer_disk = D_DISKLESS; |
|
} else { |
|
if (test_and_clear_bit(CONN_DRY_RUN, &peer_device->connection->flags)) |
|
return -EIO; |
|
D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS); |
|
conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
return -EIO; |
|
} |
|
} |
|
} |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
if (os.i != drbd_read_state(device).i) |
|
goto retry; |
|
clear_bit(CONSIDER_RESYNC, &device->flags); |
|
ns.peer = peer_state.role; |
|
ns.pdsk = real_peer_disk; |
|
ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); |
|
if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
|
ns.disk = device->new_state_tmp.disk; |
|
cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
|
if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
|
test_bit(NEW_CUR_UUID, &device->flags)) { |
|
/* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
|
for temporal network outages! */ |
|
spin_unlock_irq(&device->resource->req_lock); |
|
drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
|
tl_clear(peer_device->connection); |
|
drbd_uuid_new_current(device); |
|
clear_bit(NEW_CUR_UUID, &device->flags); |
|
conn_request_state(peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
|
return -EIO; |
|
} |
|
rv = _drbd_set_state(device, ns, cs_flags, NULL); |
|
ns = drbd_read_state(device); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
if (rv < SS_SUCCESS) { |
|
conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
return -EIO; |
|
} |
|
|
|
if (os.conn > C_WF_REPORT_PARAMS) { |
|
if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && |
|
peer_state.disk != D_NEGOTIATING ) { |
|
/* we want resync, peer has not yet decided to sync... */ |
|
/* Nowadays only used when forcing a node into primary role and |
|
setting its disk to UpToDate with that */ |
|
drbd_send_uuids(peer_device); |
|
drbd_send_current_state(peer_device); |
|
} |
|
} |
|
|
|
clear_bit(DISCARD_MY_DATA, &device->flags); |
|
|
|
drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */ |
|
|
|
return 0; |
|
} |
|
|
|
static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_rs_uuid *p = pi->data; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
wait_event(device->misc_wait, |
|
device->state.conn == C_WF_SYNC_UUID || |
|
device->state.conn == C_BEHIND || |
|
device->state.conn < C_CONNECTED || |
|
device->state.disk < D_NEGOTIATING); |
|
|
|
/* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */ |
|
|
|
/* Here the _drbd_uuid_ functions are right, current should |
|
_not_ be rotated into the history */ |
|
if (get_ldev_if_state(device, D_NEGOTIATING)) { |
|
_drbd_uuid_set(device, UI_CURRENT, be64_to_cpu(p->uuid)); |
|
_drbd_uuid_set(device, UI_BITMAP, 0UL); |
|
|
|
drbd_print_uuids(device, "updated sync uuid"); |
|
drbd_start_resync(device, C_SYNC_TARGET); |
|
|
|
put_ldev(device); |
|
} else |
|
drbd_err(device, "Ignoring SyncUUID packet!\n"); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* receive_bitmap_plain |
|
* |
|
* Return 0 when done, 1 when another iteration is needed, and a negative error |
|
* code upon failure. |
|
*/ |
|
static int |
|
receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size, |
|
unsigned long *p, struct bm_xfer_ctx *c) |
|
{ |
|
unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
|
drbd_header_size(peer_device->connection); |
|
unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
|
c->bm_words - c->word_offset); |
|
unsigned int want = num_words * sizeof(*p); |
|
int err; |
|
|
|
if (want != size) { |
|
drbd_err(peer_device, "%s:want (%u) != size (%u)\n", __func__, want, size); |
|
return -EIO; |
|
} |
|
if (want == 0) |
|
return 0; |
|
err = drbd_recv_all(peer_device->connection, p, want); |
|
if (err) |
|
return err; |
|
|
|
drbd_bm_merge_lel(peer_device->device, c->word_offset, num_words, p); |
|
|
|
c->word_offset += num_words; |
|
c->bit_offset = c->word_offset * BITS_PER_LONG; |
|
if (c->bit_offset > c->bm_bits) |
|
c->bit_offset = c->bm_bits; |
|
|
|
return 1; |
|
} |
|
|
|
static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
|
{ |
|
return (enum drbd_bitmap_code)(p->encoding & 0x0f); |
|
} |
|
|
|
static int dcbp_get_start(struct p_compressed_bm *p) |
|
{ |
|
return (p->encoding & 0x80) != 0; |
|
} |
|
|
|
static int dcbp_get_pad_bits(struct p_compressed_bm *p) |
|
{ |
|
return (p->encoding >> 4) & 0x7; |
|
} |
|
|
|
/* |
|
* recv_bm_rle_bits |
|
* |
|
* Return 0 when done, 1 when another iteration is needed, and a negative error |
|
* code upon failure. |
|
*/ |
|
static int |
|
recv_bm_rle_bits(struct drbd_peer_device *peer_device, |
|
struct p_compressed_bm *p, |
|
struct bm_xfer_ctx *c, |
|
unsigned int len) |
|
{ |
|
struct bitstream bs; |
|
u64 look_ahead; |
|
u64 rl; |
|
u64 tmp; |
|
unsigned long s = c->bit_offset; |
|
unsigned long e; |
|
int toggle = dcbp_get_start(p); |
|
int have; |
|
int bits; |
|
|
|
bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
|
|
|
bits = bitstream_get_bits(&bs, &look_ahead, 64); |
|
if (bits < 0) |
|
return -EIO; |
|
|
|
for (have = bits; have > 0; s += rl, toggle = !toggle) { |
|
bits = vli_decode_bits(&rl, look_ahead); |
|
if (bits <= 0) |
|
return -EIO; |
|
|
|
if (toggle) { |
|
e = s + rl -1; |
|
if (e >= c->bm_bits) { |
|
drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); |
|
return -EIO; |
|
} |
|
_drbd_bm_set_bits(peer_device->device, s, e); |
|
} |
|
|
|
if (have < bits) { |
|
drbd_err(peer_device, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", |
|
have, bits, look_ahead, |
|
(unsigned int)(bs.cur.b - p->code), |
|
(unsigned int)bs.buf_len); |
|
return -EIO; |
|
} |
|
/* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */ |
|
if (likely(bits < 64)) |
|
look_ahead >>= bits; |
|
else |
|
look_ahead = 0; |
|
have -= bits; |
|
|
|
bits = bitstream_get_bits(&bs, &tmp, 64 - have); |
|
if (bits < 0) |
|
return -EIO; |
|
look_ahead |= tmp << have; |
|
have += bits; |
|
} |
|
|
|
c->bit_offset = s; |
|
bm_xfer_ctx_bit_to_word_offset(c); |
|
|
|
return (s != c->bm_bits); |
|
} |
|
|
|
/* |
|
* decode_bitmap_c |
|
* |
|
* Return 0 when done, 1 when another iteration is needed, and a negative error |
|
* code upon failure. |
|
*/ |
|
static int |
|
decode_bitmap_c(struct drbd_peer_device *peer_device, |
|
struct p_compressed_bm *p, |
|
struct bm_xfer_ctx *c, |
|
unsigned int len) |
|
{ |
|
if (dcbp_get_code(p) == RLE_VLI_Bits) |
|
return recv_bm_rle_bits(peer_device, p, c, len - sizeof(*p)); |
|
|
|
/* other variants had been implemented for evaluation, |
|
* but have been dropped as this one turned out to be "best" |
|
* during all our tests. */ |
|
|
|
drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n", p->encoding); |
|
conn_request_state(peer_device->connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
|
return -EIO; |
|
} |
|
|
|
void INFO_bm_xfer_stats(struct drbd_device *device, |
|
const char *direction, struct bm_xfer_ctx *c) |
|
{ |
|
/* what would it take to transfer it "plaintext" */ |
|
unsigned int header_size = drbd_header_size(first_peer_device(device)->connection); |
|
unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
|
unsigned int plain = |
|
header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + |
|
c->bm_words * sizeof(unsigned long); |
|
unsigned int total = c->bytes[0] + c->bytes[1]; |
|
unsigned int r; |
|
|
|
/* total can not be zero. but just in case: */ |
|
if (total == 0) |
|
return; |
|
|
|
/* don't report if not compressed */ |
|
if (total >= plain) |
|
return; |
|
|
|
/* total < plain. check for overflow, still */ |
|
r = (total > UINT_MAX/1000) ? (total / (plain/1000)) |
|
: (1000 * total / plain); |
|
|
|
if (r > 1000) |
|
r = 1000; |
|
|
|
r = 1000 - r; |
|
drbd_info(device, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " |
|
"total %u; compression: %u.%u%%\n", |
|
direction, |
|
c->bytes[1], c->packets[1], |
|
c->bytes[0], c->packets[0], |
|
total, r/10, r % 10); |
|
} |
|
|
|
/* Since we are processing the bitfield from lower addresses to higher, |
|
it does not matter if the process it in 32 bit chunks or 64 bit |
|
chunks as long as it is little endian. (Understand it as byte stream, |
|
beginning with the lowest byte...) If we would use big endian |
|
we would need to process it from the highest address to the lowest, |
|
in order to be agnostic to the 32 vs 64 bits issue. |
|
|
|
returns 0 on failure, 1 if we successfully received it. */ |
|
static int receive_bitmap(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct bm_xfer_ctx c; |
|
int err; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
drbd_bm_lock(device, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
|
/* you are supposed to send additional out-of-sync information |
|
* if you actually set bits during this phase */ |
|
|
|
c = (struct bm_xfer_ctx) { |
|
.bm_bits = drbd_bm_bits(device), |
|
.bm_words = drbd_bm_words(device), |
|
}; |
|
|
|
for(;;) { |
|
if (pi->cmd == P_BITMAP) |
|
err = receive_bitmap_plain(peer_device, pi->size, pi->data, &c); |
|
else if (pi->cmd == P_COMPRESSED_BITMAP) { |
|
/* MAYBE: sanity check that we speak proto >= 90, |
|
* and the feature is enabled! */ |
|
struct p_compressed_bm *p = pi->data; |
|
|
|
if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) { |
|
drbd_err(device, "ReportCBitmap packet too large\n"); |
|
err = -EIO; |
|
goto out; |
|
} |
|
if (pi->size <= sizeof(*p)) { |
|
drbd_err(device, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
|
err = -EIO; |
|
goto out; |
|
} |
|
err = drbd_recv_all(peer_device->connection, p, pi->size); |
|
if (err) |
|
goto out; |
|
err = decode_bitmap_c(peer_device, p, &c, pi->size); |
|
} else { |
|
drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
|
err = -EIO; |
|
goto out; |
|
} |
|
|
|
c.packets[pi->cmd == P_BITMAP]++; |
|
c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size; |
|
|
|
if (err <= 0) { |
|
if (err < 0) |
|
goto out; |
|
break; |
|
} |
|
err = drbd_recv_header(peer_device->connection, pi); |
|
if (err) |
|
goto out; |
|
} |
|
|
|
INFO_bm_xfer_stats(device, "receive", &c); |
|
|
|
if (device->state.conn == C_WF_BITMAP_T) { |
|
enum drbd_state_rv rv; |
|
|
|
err = drbd_send_bitmap(device); |
|
if (err) |
|
goto out; |
|
/* Omit CS_ORDERED with this state transition to avoid deadlocks. */ |
|
rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
|
D_ASSERT(device, rv == SS_SUCCESS); |
|
} else if (device->state.conn != C_WF_BITMAP_S) { |
|
/* admin may have requested C_DISCONNECTING, |
|
* other threads may have noticed network errors */ |
|
drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n", |
|
drbd_conn_str(device->state.conn)); |
|
} |
|
err = 0; |
|
|
|
out: |
|
drbd_bm_unlock(device); |
|
if (!err && device->state.conn == C_WF_BITMAP_S) |
|
drbd_start_resync(device, C_SYNC_SOURCE); |
|
return err; |
|
} |
|
|
|
static int receive_skip(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n", |
|
pi->cmd, pi->size); |
|
|
|
return ignore_remaining_packet(connection, pi); |
|
} |
|
|
|
static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
/* Make sure we've acked all the TCP data associated |
|
* with the data requests being unplugged */ |
|
tcp_sock_set_quickack(connection->data.socket->sk, 2); |
|
return 0; |
|
} |
|
|
|
static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_block_desc *p = pi->data; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
switch (device->state.conn) { |
|
case C_WF_SYNC_UUID: |
|
case C_WF_BITMAP_T: |
|
case C_BEHIND: |
|
break; |
|
default: |
|
drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", |
|
drbd_conn_str(device->state.conn)); |
|
} |
|
|
|
drbd_set_out_of_sync(device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
|
|
|
return 0; |
|
} |
|
|
|
static int receive_rs_deallocated(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct p_block_desc *p = pi->data; |
|
struct drbd_device *device; |
|
sector_t sector; |
|
int size, err = 0; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
sector = be64_to_cpu(p->sector); |
|
size = be32_to_cpu(p->blksize); |
|
|
|
dec_rs_pending(device); |
|
|
|
if (get_ldev(device)) { |
|
struct drbd_peer_request *peer_req; |
|
const int op = REQ_OP_WRITE_ZEROES; |
|
|
|
peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER, sector, |
|
size, 0, GFP_NOIO); |
|
if (!peer_req) { |
|
put_ldev(device); |
|
return -ENOMEM; |
|
} |
|
|
|
peer_req->w.cb = e_end_resync_block; |
|
peer_req->submit_jif = jiffies; |
|
peer_req->flags |= EE_TRIM; |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
list_add_tail(&peer_req->w.list, &device->sync_ee); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
atomic_add(pi->size >> 9, &device->rs_sect_ev); |
|
err = drbd_submit_peer_request(device, peer_req, op, 0, DRBD_FAULT_RS_WR); |
|
|
|
if (err) { |
|
spin_lock_irq(&device->resource->req_lock); |
|
list_del(&peer_req->w.list); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
drbd_free_peer_req(device, peer_req); |
|
put_ldev(device); |
|
err = 0; |
|
goto fail; |
|
} |
|
|
|
inc_unacked(device); |
|
|
|
/* No put_ldev() here. Gets called in drbd_endio_write_sec_final(), |
|
as well as drbd_rs_complete_io() */ |
|
} else { |
|
fail: |
|
drbd_rs_complete_io(device, sector); |
|
drbd_send_ack_ex(peer_device, P_NEG_ACK, sector, size, ID_SYNCER); |
|
} |
|
|
|
atomic_add(size >> 9, &device->rs_sect_in); |
|
|
|
return err; |
|
} |
|
|
|
struct data_cmd { |
|
int expect_payload; |
|
unsigned int pkt_size; |
|
int (*fn)(struct drbd_connection *, struct packet_info *); |
|
}; |
|
|
|
static struct data_cmd drbd_cmd_handler[] = { |
|
[P_DATA] = { 1, sizeof(struct p_data), receive_Data }, |
|
[P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, |
|
[P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , |
|
[P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , |
|
[P_BITMAP] = { 1, 0, receive_bitmap } , |
|
[P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , |
|
[P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, |
|
[P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
|
[P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
|
[P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
|
[P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, |
|
[P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
|
[P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, |
|
[P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, |
|
[P_STATE] = { 0, sizeof(struct p_state), receive_state }, |
|
[P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, |
|
[P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, |
|
[P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
|
[P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, |
|
[P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, |
|
[P_RS_THIN_REQ] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
|
[P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, |
|
[P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, |
|
[P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, |
|
[P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
|
[P_TRIM] = { 0, sizeof(struct p_trim), receive_Data }, |
|
[P_ZEROES] = { 0, sizeof(struct p_trim), receive_Data }, |
|
[P_RS_DEALLOCATED] = { 0, sizeof(struct p_block_desc), receive_rs_deallocated }, |
|
[P_WSAME] = { 1, sizeof(struct p_wsame), receive_Data }, |
|
}; |
|
|
|
static void drbdd(struct drbd_connection *connection) |
|
{ |
|
struct packet_info pi; |
|
size_t shs; /* sub header size */ |
|
int err; |
|
|
|
while (get_t_state(&connection->receiver) == RUNNING) { |
|
struct data_cmd const *cmd; |
|
|
|
drbd_thread_current_set_cpu(&connection->receiver); |
|
update_receiver_timing_details(connection, drbd_recv_header_maybe_unplug); |
|
if (drbd_recv_header_maybe_unplug(connection, &pi)) |
|
goto err_out; |
|
|
|
cmd = &drbd_cmd_handler[pi.cmd]; |
|
if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
|
drbd_err(connection, "Unexpected data packet %s (0x%04x)", |
|
cmdname(pi.cmd), pi.cmd); |
|
goto err_out; |
|
} |
|
|
|
shs = cmd->pkt_size; |
|
if (pi.cmd == P_SIZES && connection->agreed_features & DRBD_FF_WSAME) |
|
shs += sizeof(struct o_qlim); |
|
if (pi.size > shs && !cmd->expect_payload) { |
|
drbd_err(connection, "No payload expected %s l:%d\n", |
|
cmdname(pi.cmd), pi.size); |
|
goto err_out; |
|
} |
|
if (pi.size < shs) { |
|
drbd_err(connection, "%s: unexpected packet size, expected:%d received:%d\n", |
|
cmdname(pi.cmd), (int)shs, pi.size); |
|
goto err_out; |
|
} |
|
|
|
if (shs) { |
|
update_receiver_timing_details(connection, drbd_recv_all_warn); |
|
err = drbd_recv_all_warn(connection, pi.data, shs); |
|
if (err) |
|
goto err_out; |
|
pi.size -= shs; |
|
} |
|
|
|
update_receiver_timing_details(connection, cmd->fn); |
|
err = cmd->fn(connection, &pi); |
|
if (err) { |
|
drbd_err(connection, "error receiving %s, e: %d l: %d!\n", |
|
cmdname(pi.cmd), err, pi.size); |
|
goto err_out; |
|
} |
|
} |
|
return; |
|
|
|
err_out: |
|
conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
|
} |
|
|
|
static void conn_disconnect(struct drbd_connection *connection) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
enum drbd_conns oc; |
|
int vnr; |
|
|
|
if (connection->cstate == C_STANDALONE) |
|
return; |
|
|
|
/* We are about to start the cleanup after connection loss. |
|
* Make sure drbd_make_request knows about that. |
|
* Usually we should be in some network failure state already, |
|
* but just in case we are not, we fix it up here. |
|
*/ |
|
conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
|
|
|
/* ack_receiver does not clean up anything. it must not interfere, either */ |
|
drbd_thread_stop(&connection->ack_receiver); |
|
if (connection->ack_sender) { |
|
destroy_workqueue(connection->ack_sender); |
|
connection->ack_sender = NULL; |
|
} |
|
drbd_free_sock(connection); |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
|
struct drbd_device *device = peer_device->device; |
|
kref_get(&device->kref); |
|
rcu_read_unlock(); |
|
drbd_disconnected(peer_device); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
rcu_read_lock(); |
|
} |
|
rcu_read_unlock(); |
|
|
|
if (!list_empty(&connection->current_epoch->list)) |
|
drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n"); |
|
/* ok, no more ee's on the fly, it is safe to reset the epoch_size */ |
|
atomic_set(&connection->current_epoch->epoch_size, 0); |
|
connection->send.seen_any_write_yet = false; |
|
|
|
drbd_info(connection, "Connection closed\n"); |
|
|
|
if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN) |
|
conn_try_outdate_peer_async(connection); |
|
|
|
spin_lock_irq(&connection->resource->req_lock); |
|
oc = connection->cstate; |
|
if (oc >= C_UNCONNECTED) |
|
_conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
|
|
|
spin_unlock_irq(&connection->resource->req_lock); |
|
|
|
if (oc == C_DISCONNECTING) |
|
conn_request_state(connection, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
|
} |
|
|
|
static int drbd_disconnected(struct drbd_peer_device *peer_device) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
unsigned int i; |
|
|
|
/* wait for current activity to cease. */ |
|
spin_lock_irq(&device->resource->req_lock); |
|
_drbd_wait_ee_list_empty(device, &device->active_ee); |
|
_drbd_wait_ee_list_empty(device, &device->sync_ee); |
|
_drbd_wait_ee_list_empty(device, &device->read_ee); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
/* We do not have data structures that would allow us to |
|
* get the rs_pending_cnt down to 0 again. |
|
* * On C_SYNC_TARGET we do not have any data structures describing |
|
* the pending RSDataRequest's we have sent. |
|
* * On C_SYNC_SOURCE there is no data structure that tracks |
|
* the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. |
|
* And no, it is not the sum of the reference counts in the |
|
* resync_LRU. The resync_LRU tracks the whole operation including |
|
* the disk-IO, while the rs_pending_cnt only tracks the blocks |
|
* on the fly. */ |
|
drbd_rs_cancel_all(device); |
|
device->rs_total = 0; |
|
device->rs_failed = 0; |
|
atomic_set(&device->rs_pending_cnt, 0); |
|
wake_up(&device->misc_wait); |
|
|
|
del_timer_sync(&device->resync_timer); |
|
resync_timer_fn(&device->resync_timer); |
|
|
|
/* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
|
* w_make_resync_request etc. which may still be on the worker queue |
|
* to be "canceled" */ |
|
drbd_flush_workqueue(&peer_device->connection->sender_work); |
|
|
|
drbd_finish_peer_reqs(device); |
|
|
|
/* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
|
might have issued a work again. The one before drbd_finish_peer_reqs() is |
|
necessary to reclain net_ee in drbd_finish_peer_reqs(). */ |
|
drbd_flush_workqueue(&peer_device->connection->sender_work); |
|
|
|
/* need to do it again, drbd_finish_peer_reqs() may have populated it |
|
* again via drbd_try_clear_on_disk_bm(). */ |
|
drbd_rs_cancel_all(device); |
|
|
|
kfree(device->p_uuid); |
|
device->p_uuid = NULL; |
|
|
|
if (!drbd_suspended(device)) |
|
tl_clear(peer_device->connection); |
|
|
|
drbd_md_sync(device); |
|
|
|
if (get_ldev(device)) { |
|
drbd_bitmap_io(device, &drbd_bm_write_copy_pages, |
|
"write from disconnected", BM_LOCKED_CHANGE_ALLOWED); |
|
put_ldev(device); |
|
} |
|
|
|
/* tcp_close and release of sendpage pages can be deferred. I don't |
|
* want to use SO_LINGER, because apparently it can be deferred for |
|
* more than 20 seconds (longest time I checked). |
|
* |
|
* Actually we don't care for exactly when the network stack does its |
|
* put_page(), but release our reference on these pages right here. |
|
*/ |
|
i = drbd_free_peer_reqs(device, &device->net_ee); |
|
if (i) |
|
drbd_info(device, "net_ee not empty, killed %u entries\n", i); |
|
i = atomic_read(&device->pp_in_use_by_net); |
|
if (i) |
|
drbd_info(device, "pp_in_use_by_net = %d, expected 0\n", i); |
|
i = atomic_read(&device->pp_in_use); |
|
if (i) |
|
drbd_info(device, "pp_in_use = %d, expected 0\n", i); |
|
|
|
D_ASSERT(device, list_empty(&device->read_ee)); |
|
D_ASSERT(device, list_empty(&device->active_ee)); |
|
D_ASSERT(device, list_empty(&device->sync_ee)); |
|
D_ASSERT(device, list_empty(&device->done_ee)); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version |
|
* we can agree on is stored in agreed_pro_version. |
|
* |
|
* feature flags and the reserved array should be enough room for future |
|
* enhancements of the handshake protocol, and possible plugins... |
|
* |
|
* for now, they are expected to be zero, but ignored. |
|
*/ |
|
static int drbd_send_features(struct drbd_connection *connection) |
|
{ |
|
struct drbd_socket *sock; |
|
struct p_connection_features *p; |
|
|
|
sock = &connection->data; |
|
p = conn_prepare_command(connection, sock); |
|
if (!p) |
|
return -EIO; |
|
memset(p, 0, sizeof(*p)); |
|
p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); |
|
p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); |
|
p->feature_flags = cpu_to_be32(PRO_FEATURES); |
|
return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
|
} |
|
|
|
/* |
|
* return values: |
|
* 1 yes, we have a valid connection |
|
* 0 oops, did not work out, please try again |
|
* -1 peer talks different language, |
|
* no point in trying again, please go standalone. |
|
*/ |
|
static int drbd_do_features(struct drbd_connection *connection) |
|
{ |
|
/* ASSERT current == connection->receiver ... */ |
|
struct p_connection_features *p; |
|
const int expect = sizeof(struct p_connection_features); |
|
struct packet_info pi; |
|
int err; |
|
|
|
err = drbd_send_features(connection); |
|
if (err) |
|
return 0; |
|
|
|
err = drbd_recv_header(connection, &pi); |
|
if (err) |
|
return 0; |
|
|
|
if (pi.cmd != P_CONNECTION_FEATURES) { |
|
drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", |
|
cmdname(pi.cmd), pi.cmd); |
|
return -1; |
|
} |
|
|
|
if (pi.size != expect) { |
|
drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n", |
|
expect, pi.size); |
|
return -1; |
|
} |
|
|
|
p = pi.data; |
|
err = drbd_recv_all_warn(connection, p, expect); |
|
if (err) |
|
return 0; |
|
|
|
p->protocol_min = be32_to_cpu(p->protocol_min); |
|
p->protocol_max = be32_to_cpu(p->protocol_max); |
|
if (p->protocol_max == 0) |
|
p->protocol_max = p->protocol_min; |
|
|
|
if (PRO_VERSION_MAX < p->protocol_min || |
|
PRO_VERSION_MIN > p->protocol_max) |
|
goto incompat; |
|
|
|
connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
|
connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags); |
|
|
|
drbd_info(connection, "Handshake successful: " |
|
"Agreed network protocol version %d\n", connection->agreed_pro_version); |
|
|
|
drbd_info(connection, "Feature flags enabled on protocol level: 0x%x%s%s%s%s.\n", |
|
connection->agreed_features, |
|
connection->agreed_features & DRBD_FF_TRIM ? " TRIM" : "", |
|
connection->agreed_features & DRBD_FF_THIN_RESYNC ? " THIN_RESYNC" : "", |
|
connection->agreed_features & DRBD_FF_WSAME ? " WRITE_SAME" : "", |
|
connection->agreed_features & DRBD_FF_WZEROES ? " WRITE_ZEROES" : |
|
connection->agreed_features ? "" : " none"); |
|
|
|
return 1; |
|
|
|
incompat: |
|
drbd_err(connection, "incompatible DRBD dialects: " |
|
"I support %d-%d, peer supports %d-%d\n", |
|
PRO_VERSION_MIN, PRO_VERSION_MAX, |
|
p->protocol_min, p->protocol_max); |
|
return -1; |
|
} |
|
|
|
#if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) |
|
static int drbd_do_auth(struct drbd_connection *connection) |
|
{ |
|
drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); |
|
drbd_err(connection, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); |
|
return -1; |
|
} |
|
#else |
|
#define CHALLENGE_LEN 64 |
|
|
|
/* Return value: |
|
1 - auth succeeded, |
|
0 - failed, try again (network error), |
|
-1 - auth failed, don't try again. |
|
*/ |
|
|
|
static int drbd_do_auth(struct drbd_connection *connection) |
|
{ |
|
struct drbd_socket *sock; |
|
char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
|
char *response = NULL; |
|
char *right_response = NULL; |
|
char *peers_ch = NULL; |
|
unsigned int key_len; |
|
char secret[SHARED_SECRET_MAX]; /* 64 byte */ |
|
unsigned int resp_size; |
|
struct shash_desc *desc; |
|
struct packet_info pi; |
|
struct net_conf *nc; |
|
int err, rv; |
|
|
|
/* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
key_len = strlen(nc->shared_secret); |
|
memcpy(secret, nc->shared_secret, key_len); |
|
rcu_read_unlock(); |
|
|
|
desc = kmalloc(sizeof(struct shash_desc) + |
|
crypto_shash_descsize(connection->cram_hmac_tfm), |
|
GFP_KERNEL); |
|
if (!desc) { |
|
rv = -1; |
|
goto fail; |
|
} |
|
desc->tfm = connection->cram_hmac_tfm; |
|
|
|
rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len); |
|
if (rv) { |
|
drbd_err(connection, "crypto_shash_setkey() failed with %d\n", rv); |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
get_random_bytes(my_challenge, CHALLENGE_LEN); |
|
|
|
sock = &connection->data; |
|
if (!conn_prepare_command(connection, sock)) { |
|
rv = 0; |
|
goto fail; |
|
} |
|
rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0, |
|
my_challenge, CHALLENGE_LEN); |
|
if (!rv) |
|
goto fail; |
|
|
|
err = drbd_recv_header(connection, &pi); |
|
if (err) { |
|
rv = 0; |
|
goto fail; |
|
} |
|
|
|
if (pi.cmd != P_AUTH_CHALLENGE) { |
|
drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
|
cmdname(pi.cmd), pi.cmd); |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
if (pi.size > CHALLENGE_LEN * 2) { |
|
drbd_err(connection, "expected AuthChallenge payload too big.\n"); |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
if (pi.size < CHALLENGE_LEN) { |
|
drbd_err(connection, "AuthChallenge payload too small.\n"); |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
peers_ch = kmalloc(pi.size, GFP_NOIO); |
|
if (!peers_ch) { |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
err = drbd_recv_all_warn(connection, peers_ch, pi.size); |
|
if (err) { |
|
rv = 0; |
|
goto fail; |
|
} |
|
|
|
if (!memcmp(my_challenge, peers_ch, CHALLENGE_LEN)) { |
|
drbd_err(connection, "Peer presented the same challenge!\n"); |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
resp_size = crypto_shash_digestsize(connection->cram_hmac_tfm); |
|
response = kmalloc(resp_size, GFP_NOIO); |
|
if (!response) { |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
rv = crypto_shash_digest(desc, peers_ch, pi.size, response); |
|
if (rv) { |
|
drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
if (!conn_prepare_command(connection, sock)) { |
|
rv = 0; |
|
goto fail; |
|
} |
|
rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0, |
|
response, resp_size); |
|
if (!rv) |
|
goto fail; |
|
|
|
err = drbd_recv_header(connection, &pi); |
|
if (err) { |
|
rv = 0; |
|
goto fail; |
|
} |
|
|
|
if (pi.cmd != P_AUTH_RESPONSE) { |
|
drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n", |
|
cmdname(pi.cmd), pi.cmd); |
|
rv = 0; |
|
goto fail; |
|
} |
|
|
|
if (pi.size != resp_size) { |
|
drbd_err(connection, "expected AuthResponse payload of wrong size\n"); |
|
rv = 0; |
|
goto fail; |
|
} |
|
|
|
err = drbd_recv_all_warn(connection, response , resp_size); |
|
if (err) { |
|
rv = 0; |
|
goto fail; |
|
} |
|
|
|
right_response = kmalloc(resp_size, GFP_NOIO); |
|
if (!right_response) { |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
rv = crypto_shash_digest(desc, my_challenge, CHALLENGE_LEN, |
|
right_response); |
|
if (rv) { |
|
drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
|
rv = -1; |
|
goto fail; |
|
} |
|
|
|
rv = !memcmp(response, right_response, resp_size); |
|
|
|
if (rv) |
|
drbd_info(connection, "Peer authenticated using %d bytes HMAC\n", |
|
resp_size); |
|
else |
|
rv = -1; |
|
|
|
fail: |
|
kfree(peers_ch); |
|
kfree(response); |
|
kfree(right_response); |
|
if (desc) { |
|
shash_desc_zero(desc); |
|
kfree(desc); |
|
} |
|
|
|
return rv; |
|
} |
|
#endif |
|
|
|
int drbd_receiver(struct drbd_thread *thi) |
|
{ |
|
struct drbd_connection *connection = thi->connection; |
|
int h; |
|
|
|
drbd_info(connection, "receiver (re)started\n"); |
|
|
|
do { |
|
h = conn_connect(connection); |
|
if (h == 0) { |
|
conn_disconnect(connection); |
|
schedule_timeout_interruptible(HZ); |
|
} |
|
if (h == -1) { |
|
drbd_warn(connection, "Discarding network configuration.\n"); |
|
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
} |
|
} while (h == 0); |
|
|
|
if (h > 0) { |
|
blk_start_plug(&connection->receiver_plug); |
|
drbdd(connection); |
|
blk_finish_plug(&connection->receiver_plug); |
|
} |
|
|
|
conn_disconnect(connection); |
|
|
|
drbd_info(connection, "receiver terminated\n"); |
|
return 0; |
|
} |
|
|
|
/* ********* acknowledge sender ******** */ |
|
|
|
static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct p_req_state_reply *p = pi->data; |
|
int retcode = be32_to_cpu(p->retcode); |
|
|
|
if (retcode >= SS_SUCCESS) { |
|
set_bit(CONN_WD_ST_CHG_OKAY, &connection->flags); |
|
} else { |
|
set_bit(CONN_WD_ST_CHG_FAIL, &connection->flags); |
|
drbd_err(connection, "Requested state change failed by peer: %s (%d)\n", |
|
drbd_set_st_err_str(retcode), retcode); |
|
} |
|
wake_up(&connection->ping_wait); |
|
|
|
return 0; |
|
} |
|
|
|
static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_req_state_reply *p = pi->data; |
|
int retcode = be32_to_cpu(p->retcode); |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) { |
|
D_ASSERT(device, connection->agreed_pro_version < 100); |
|
return got_conn_RqSReply(connection, pi); |
|
} |
|
|
|
if (retcode >= SS_SUCCESS) { |
|
set_bit(CL_ST_CHG_SUCCESS, &device->flags); |
|
} else { |
|
set_bit(CL_ST_CHG_FAIL, &device->flags); |
|
drbd_err(device, "Requested state change failed by peer: %s (%d)\n", |
|
drbd_set_st_err_str(retcode), retcode); |
|
} |
|
wake_up(&device->state_wait); |
|
|
|
return 0; |
|
} |
|
|
|
static int got_Ping(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
return drbd_send_ping_ack(connection); |
|
|
|
} |
|
|
|
static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
/* restore idle timeout */ |
|
connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ; |
|
if (!test_and_set_bit(GOT_PING_ACK, &connection->flags)) |
|
wake_up(&connection->ping_wait); |
|
|
|
return 0; |
|
} |
|
|
|
static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_block_ack *p = pi->data; |
|
sector_t sector = be64_to_cpu(p->sector); |
|
int blksize = be32_to_cpu(p->blksize); |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
|
|
|
update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
|
|
|
if (get_ldev(device)) { |
|
drbd_rs_complete_io(device, sector); |
|
drbd_set_in_sync(device, sector, blksize); |
|
/* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ |
|
device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); |
|
put_ldev(device); |
|
} |
|
dec_rs_pending(device); |
|
atomic_add(blksize >> 9, &device->rs_sect_in); |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector, |
|
struct rb_root *root, const char *func, |
|
enum drbd_req_event what, bool missing_ok) |
|
{ |
|
struct drbd_request *req; |
|
struct bio_and_error m; |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
req = find_request(device, root, id, sector, missing_ok, func); |
|
if (unlikely(!req)) { |
|
spin_unlock_irq(&device->resource->req_lock); |
|
return -EIO; |
|
} |
|
__req_mod(req, what, &m); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
if (m.bio) |
|
complete_master_bio(device, &m); |
|
return 0; |
|
} |
|
|
|
static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_block_ack *p = pi->data; |
|
sector_t sector = be64_to_cpu(p->sector); |
|
int blksize = be32_to_cpu(p->blksize); |
|
enum drbd_req_event what; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
|
|
|
if (p->block_id == ID_SYNCER) { |
|
drbd_set_in_sync(device, sector, blksize); |
|
dec_rs_pending(device); |
|
return 0; |
|
} |
|
switch (pi->cmd) { |
|
case P_RS_WRITE_ACK: |
|
what = WRITE_ACKED_BY_PEER_AND_SIS; |
|
break; |
|
case P_WRITE_ACK: |
|
what = WRITE_ACKED_BY_PEER; |
|
break; |
|
case P_RECV_ACK: |
|
what = RECV_ACKED_BY_PEER; |
|
break; |
|
case P_SUPERSEDED: |
|
what = CONFLICT_RESOLVED; |
|
break; |
|
case P_RETRY_WRITE: |
|
what = POSTPONE_WRITE; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
|
|
return validate_req_change_req_state(device, p->block_id, sector, |
|
&device->write_requests, __func__, |
|
what, false); |
|
} |
|
|
|
static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_block_ack *p = pi->data; |
|
sector_t sector = be64_to_cpu(p->sector); |
|
int size = be32_to_cpu(p->blksize); |
|
int err; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
|
|
|
if (p->block_id == ID_SYNCER) { |
|
dec_rs_pending(device); |
|
drbd_rs_failed_io(device, sector, size); |
|
return 0; |
|
} |
|
|
|
err = validate_req_change_req_state(device, p->block_id, sector, |
|
&device->write_requests, __func__, |
|
NEG_ACKED, true); |
|
if (err) { |
|
/* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
|
The master bio might already be completed, therefore the |
|
request is no longer in the collision hash. */ |
|
/* In Protocol B we might already have got a P_RECV_ACK |
|
but then get a P_NEG_ACK afterwards. */ |
|
drbd_set_out_of_sync(device, sector, size); |
|
} |
|
return 0; |
|
} |
|
|
|
static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_block_ack *p = pi->data; |
|
sector_t sector = be64_to_cpu(p->sector); |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
|
|
|
drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n", |
|
(unsigned long long)sector, be32_to_cpu(p->blksize)); |
|
|
|
return validate_req_change_req_state(device, p->block_id, sector, |
|
&device->read_requests, __func__, |
|
NEG_ACKED, false); |
|
} |
|
|
|
static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
sector_t sector; |
|
int size; |
|
struct p_block_ack *p = pi->data; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
sector = be64_to_cpu(p->sector); |
|
size = be32_to_cpu(p->blksize); |
|
|
|
update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
|
|
|
dec_rs_pending(device); |
|
|
|
if (get_ldev_if_state(device, D_FAILED)) { |
|
drbd_rs_complete_io(device, sector); |
|
switch (pi->cmd) { |
|
case P_NEG_RS_DREPLY: |
|
drbd_rs_failed_io(device, sector, size); |
|
break; |
|
case P_RS_CANCEL: |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
put_ldev(device); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct p_barrier_ack *p = pi->data; |
|
struct drbd_peer_device *peer_device; |
|
int vnr; |
|
|
|
tl_release(connection, p->barrier, be32_to_cpu(p->set_size)); |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
|
struct drbd_device *device = peer_device->device; |
|
|
|
if (device->state.conn == C_AHEAD && |
|
atomic_read(&device->ap_in_flight) == 0 && |
|
!test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &device->flags)) { |
|
device->start_resync_timer.expires = jiffies + HZ; |
|
add_timer(&device->start_resync_timer); |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
return 0; |
|
} |
|
|
|
static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_device *device; |
|
struct p_block_ack *p = pi->data; |
|
struct drbd_device_work *dw; |
|
sector_t sector; |
|
int size; |
|
|
|
peer_device = conn_peer_device(connection, pi->vnr); |
|
if (!peer_device) |
|
return -EIO; |
|
device = peer_device->device; |
|
|
|
sector = be64_to_cpu(p->sector); |
|
size = be32_to_cpu(p->blksize); |
|
|
|
update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
|
|
|
if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) |
|
drbd_ov_out_of_sync_found(device, sector, size); |
|
else |
|
ov_out_of_sync_print(device); |
|
|
|
if (!get_ldev(device)) |
|
return 0; |
|
|
|
drbd_rs_complete_io(device, sector); |
|
dec_rs_pending(device); |
|
|
|
--device->ov_left; |
|
|
|
/* let's advance progress step marks only for every other megabyte */ |
|
if ((device->ov_left & 0x200) == 0x200) |
|
drbd_advance_rs_marks(device, device->ov_left); |
|
|
|
if (device->ov_left == 0) { |
|
dw = kmalloc(sizeof(*dw), GFP_NOIO); |
|
if (dw) { |
|
dw->w.cb = w_ov_finished; |
|
dw->device = device; |
|
drbd_queue_work(&peer_device->connection->sender_work, &dw->w); |
|
} else { |
|
drbd_err(device, "kmalloc(dw) failed."); |
|
ov_out_of_sync_print(device); |
|
drbd_resync_finished(device); |
|
} |
|
} |
|
put_ldev(device); |
|
return 0; |
|
} |
|
|
|
static int got_skip(struct drbd_connection *connection, struct packet_info *pi) |
|
{ |
|
return 0; |
|
} |
|
|
|
struct meta_sock_cmd { |
|
size_t pkt_size; |
|
int (*fn)(struct drbd_connection *connection, struct packet_info *); |
|
}; |
|
|
|
static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout) |
|
{ |
|
long t; |
|
struct net_conf *nc; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
t = ping_timeout ? nc->ping_timeo : nc->ping_int; |
|
rcu_read_unlock(); |
|
|
|
t *= HZ; |
|
if (ping_timeout) |
|
t /= 10; |
|
|
|
connection->meta.socket->sk->sk_rcvtimeo = t; |
|
} |
|
|
|
static void set_ping_timeout(struct drbd_connection *connection) |
|
{ |
|
set_rcvtimeo(connection, 1); |
|
} |
|
|
|
static void set_idle_timeout(struct drbd_connection *connection) |
|
{ |
|
set_rcvtimeo(connection, 0); |
|
} |
|
|
|
static struct meta_sock_cmd ack_receiver_tbl[] = { |
|
[P_PING] = { 0, got_Ping }, |
|
[P_PING_ACK] = { 0, got_PingAck }, |
|
[P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
|
[P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
|
[P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
|
[P_SUPERSEDED] = { sizeof(struct p_block_ack), got_BlockAck }, |
|
[P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, |
|
[P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, |
|
[P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
|
[P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, |
|
[P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, |
|
[P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, |
|
[P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, |
|
[P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, |
|
[P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
|
[P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, |
|
[P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, |
|
}; |
|
|
|
int drbd_ack_receiver(struct drbd_thread *thi) |
|
{ |
|
struct drbd_connection *connection = thi->connection; |
|
struct meta_sock_cmd *cmd = NULL; |
|
struct packet_info pi; |
|
unsigned long pre_recv_jif; |
|
int rv; |
|
void *buf = connection->meta.rbuf; |
|
int received = 0; |
|
unsigned int header_size = drbd_header_size(connection); |
|
int expect = header_size; |
|
bool ping_timeout_active = false; |
|
|
|
sched_set_fifo_low(current); |
|
|
|
while (get_t_state(thi) == RUNNING) { |
|
drbd_thread_current_set_cpu(thi); |
|
|
|
conn_reclaim_net_peer_reqs(connection); |
|
|
|
if (test_and_clear_bit(SEND_PING, &connection->flags)) { |
|
if (drbd_send_ping(connection)) { |
|
drbd_err(connection, "drbd_send_ping has failed\n"); |
|
goto reconnect; |
|
} |
|
set_ping_timeout(connection); |
|
ping_timeout_active = true; |
|
} |
|
|
|
pre_recv_jif = jiffies; |
|
rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0); |
|
|
|
/* Note: |
|
* -EINTR (on meta) we got a signal |
|
* -EAGAIN (on meta) rcvtimeo expired |
|
* -ECONNRESET other side closed the connection |
|
* -ERESTARTSYS (on data) we got a signal |
|
* rv < 0 other than above: unexpected error! |
|
* rv == expected: full header or command |
|
* rv < expected: "woken" by signal during receive |
|
* rv == 0 : "connection shut down by peer" |
|
*/ |
|
if (likely(rv > 0)) { |
|
received += rv; |
|
buf += rv; |
|
} else if (rv == 0) { |
|
if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
|
long t; |
|
rcu_read_lock(); |
|
t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
|
rcu_read_unlock(); |
|
|
|
t = wait_event_timeout(connection->ping_wait, |
|
connection->cstate < C_WF_REPORT_PARAMS, |
|
t); |
|
if (t) |
|
break; |
|
} |
|
drbd_err(connection, "meta connection shut down by peer.\n"); |
|
goto reconnect; |
|
} else if (rv == -EAGAIN) { |
|
/* If the data socket received something meanwhile, |
|
* that is good enough: peer is still alive. */ |
|
if (time_after(connection->last_received, pre_recv_jif)) |
|
continue; |
|
if (ping_timeout_active) { |
|
drbd_err(connection, "PingAck did not arrive in time.\n"); |
|
goto reconnect; |
|
} |
|
set_bit(SEND_PING, &connection->flags); |
|
continue; |
|
} else if (rv == -EINTR) { |
|
/* maybe drbd_thread_stop(): the while condition will notice. |
|
* maybe woken for send_ping: we'll send a ping above, |
|
* and change the rcvtimeo */ |
|
flush_signals(current); |
|
continue; |
|
} else { |
|
drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
|
goto reconnect; |
|
} |
|
|
|
if (received == expect && cmd == NULL) { |
|
if (decode_header(connection, connection->meta.rbuf, &pi)) |
|
goto reconnect; |
|
cmd = &ack_receiver_tbl[pi.cmd]; |
|
if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) { |
|
drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n", |
|
cmdname(pi.cmd), pi.cmd); |
|
goto disconnect; |
|
} |
|
expect = header_size + cmd->pkt_size; |
|
if (pi.size != expect - header_size) { |
|
drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n", |
|
pi.cmd, pi.size); |
|
goto reconnect; |
|
} |
|
} |
|
if (received == expect) { |
|
bool err; |
|
|
|
err = cmd->fn(connection, &pi); |
|
if (err) { |
|
drbd_err(connection, "%ps failed\n", cmd->fn); |
|
goto reconnect; |
|
} |
|
|
|
connection->last_received = jiffies; |
|
|
|
if (cmd == &ack_receiver_tbl[P_PING_ACK]) { |
|
set_idle_timeout(connection); |
|
ping_timeout_active = false; |
|
} |
|
|
|
buf = connection->meta.rbuf; |
|
received = 0; |
|
expect = header_size; |
|
cmd = NULL; |
|
} |
|
} |
|
|
|
if (0) { |
|
reconnect: |
|
conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
|
conn_md_sync(connection); |
|
} |
|
if (0) { |
|
disconnect: |
|
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
|
} |
|
|
|
drbd_info(connection, "ack_receiver terminated\n"); |
|
|
|
return 0; |
|
} |
|
|
|
void drbd_send_acks_wf(struct work_struct *ws) |
|
{ |
|
struct drbd_peer_device *peer_device = |
|
container_of(ws, struct drbd_peer_device, send_acks_work); |
|
struct drbd_connection *connection = peer_device->connection; |
|
struct drbd_device *device = peer_device->device; |
|
struct net_conf *nc; |
|
int tcp_cork, err; |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
tcp_cork = nc->tcp_cork; |
|
rcu_read_unlock(); |
|
|
|
if (tcp_cork) |
|
tcp_sock_set_cork(connection->meta.socket->sk, true); |
|
|
|
err = drbd_finish_peer_reqs(device); |
|
kref_put(&device->kref, drbd_destroy_device); |
|
/* get is in drbd_endio_write_sec_final(). That is necessary to keep the |
|
struct work_struct send_acks_work alive, which is in the peer_device object */ |
|
|
|
if (err) { |
|
conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
|
return; |
|
} |
|
|
|
if (tcp_cork) |
|
tcp_sock_set_cork(connection->meta.socket->sk, false); |
|
|
|
return; |
|
}
|
|
|