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3390 lines
92 KiB
3390 lines
92 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* raid1.c : Multiple Devices driver for Linux |
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* |
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* Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat |
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* |
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* Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman |
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* |
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* RAID-1 management functions. |
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* |
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* Better read-balancing code written by Mika Kuoppala <[email protected]>, 2000 |
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* |
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* Fixes to reconstruction by Jakob Østergaard" <[email protected]> |
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* Various fixes by Neil Brown <[email protected]> |
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* |
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* Changes by Peter T. Breuer <[email protected]> 31/1/2003 to support |
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* bitmapped intelligence in resync: |
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* |
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* - bitmap marked during normal i/o |
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* - bitmap used to skip nondirty blocks during sync |
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* |
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* Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: |
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* - persistent bitmap code |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/blkdev.h> |
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#include <linux/module.h> |
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#include <linux/seq_file.h> |
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#include <linux/ratelimit.h> |
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#include <linux/interval_tree_generic.h> |
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|
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#include <trace/events/block.h> |
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|
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#include "md.h" |
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#include "raid1.h" |
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#include "md-bitmap.h" |
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|
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#define UNSUPPORTED_MDDEV_FLAGS \ |
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((1L << MD_HAS_JOURNAL) | \ |
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(1L << MD_JOURNAL_CLEAN) | \ |
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(1L << MD_HAS_PPL) | \ |
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(1L << MD_HAS_MULTIPLE_PPLS)) |
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|
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static void allow_barrier(struct r1conf *conf, sector_t sector_nr); |
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static void lower_barrier(struct r1conf *conf, sector_t sector_nr); |
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|
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#define raid1_log(md, fmt, args...) \ |
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do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) |
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#include "raid1-10.c" |
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|
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#define START(node) ((node)->start) |
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#define LAST(node) ((node)->last) |
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INTERVAL_TREE_DEFINE(struct serial_info, node, sector_t, _subtree_last, |
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START, LAST, static inline, raid1_rb); |
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|
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static int check_and_add_serial(struct md_rdev *rdev, struct r1bio *r1_bio, |
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struct serial_info *si, int idx) |
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{ |
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unsigned long flags; |
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int ret = 0; |
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sector_t lo = r1_bio->sector; |
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sector_t hi = lo + r1_bio->sectors; |
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struct serial_in_rdev *serial = &rdev->serial[idx]; |
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spin_lock_irqsave(&serial->serial_lock, flags); |
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/* collision happened */ |
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if (raid1_rb_iter_first(&serial->serial_rb, lo, hi)) |
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ret = -EBUSY; |
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else { |
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si->start = lo; |
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si->last = hi; |
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raid1_rb_insert(si, &serial->serial_rb); |
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} |
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spin_unlock_irqrestore(&serial->serial_lock, flags); |
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|
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return ret; |
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} |
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static void wait_for_serialization(struct md_rdev *rdev, struct r1bio *r1_bio) |
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{ |
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struct mddev *mddev = rdev->mddev; |
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struct serial_info *si; |
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int idx = sector_to_idx(r1_bio->sector); |
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struct serial_in_rdev *serial = &rdev->serial[idx]; |
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|
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if (WARN_ON(!mddev->serial_info_pool)) |
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return; |
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si = mempool_alloc(mddev->serial_info_pool, GFP_NOIO); |
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wait_event(serial->serial_io_wait, |
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check_and_add_serial(rdev, r1_bio, si, idx) == 0); |
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} |
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static void remove_serial(struct md_rdev *rdev, sector_t lo, sector_t hi) |
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{ |
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struct serial_info *si; |
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unsigned long flags; |
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int found = 0; |
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struct mddev *mddev = rdev->mddev; |
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int idx = sector_to_idx(lo); |
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struct serial_in_rdev *serial = &rdev->serial[idx]; |
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|
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spin_lock_irqsave(&serial->serial_lock, flags); |
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for (si = raid1_rb_iter_first(&serial->serial_rb, lo, hi); |
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si; si = raid1_rb_iter_next(si, lo, hi)) { |
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if (si->start == lo && si->last == hi) { |
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raid1_rb_remove(si, &serial->serial_rb); |
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mempool_free(si, mddev->serial_info_pool); |
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found = 1; |
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break; |
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} |
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} |
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if (!found) |
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WARN(1, "The write IO is not recorded for serialization\n"); |
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spin_unlock_irqrestore(&serial->serial_lock, flags); |
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wake_up(&serial->serial_io_wait); |
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} |
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/* |
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* for resync bio, r1bio pointer can be retrieved from the per-bio |
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* 'struct resync_pages'. |
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*/ |
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static inline struct r1bio *get_resync_r1bio(struct bio *bio) |
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{ |
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return get_resync_pages(bio)->raid_bio; |
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} |
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static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
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{ |
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struct pool_info *pi = data; |
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int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
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/* allocate a r1bio with room for raid_disks entries in the bios array */ |
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return kzalloc(size, gfp_flags); |
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} |
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#define RESYNC_DEPTH 32 |
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#define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
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#define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
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#define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) |
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#define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
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#define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) |
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|
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static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
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{ |
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struct pool_info *pi = data; |
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struct r1bio *r1_bio; |
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struct bio *bio; |
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int need_pages; |
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int j; |
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struct resync_pages *rps; |
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r1_bio = r1bio_pool_alloc(gfp_flags, pi); |
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if (!r1_bio) |
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return NULL; |
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rps = kmalloc_array(pi->raid_disks, sizeof(struct resync_pages), |
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gfp_flags); |
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if (!rps) |
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goto out_free_r1bio; |
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/* |
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* Allocate bios : 1 for reading, n-1 for writing |
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*/ |
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for (j = pi->raid_disks ; j-- ; ) { |
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bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
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if (!bio) |
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goto out_free_bio; |
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r1_bio->bios[j] = bio; |
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} |
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/* |
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* Allocate RESYNC_PAGES data pages and attach them to |
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* the first bio. |
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* If this is a user-requested check/repair, allocate |
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* RESYNC_PAGES for each bio. |
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*/ |
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if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
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need_pages = pi->raid_disks; |
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else |
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need_pages = 1; |
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for (j = 0; j < pi->raid_disks; j++) { |
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struct resync_pages *rp = &rps[j]; |
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bio = r1_bio->bios[j]; |
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if (j < need_pages) { |
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if (resync_alloc_pages(rp, gfp_flags)) |
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goto out_free_pages; |
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} else { |
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memcpy(rp, &rps[0], sizeof(*rp)); |
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resync_get_all_pages(rp); |
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} |
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rp->raid_bio = r1_bio; |
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bio->bi_private = rp; |
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} |
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r1_bio->master_bio = NULL; |
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return r1_bio; |
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out_free_pages: |
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while (--j >= 0) |
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resync_free_pages(&rps[j]); |
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out_free_bio: |
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while (++j < pi->raid_disks) |
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bio_put(r1_bio->bios[j]); |
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kfree(rps); |
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out_free_r1bio: |
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rbio_pool_free(r1_bio, data); |
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return NULL; |
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} |
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static void r1buf_pool_free(void *__r1_bio, void *data) |
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{ |
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struct pool_info *pi = data; |
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int i; |
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struct r1bio *r1bio = __r1_bio; |
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struct resync_pages *rp = NULL; |
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for (i = pi->raid_disks; i--; ) { |
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rp = get_resync_pages(r1bio->bios[i]); |
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resync_free_pages(rp); |
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bio_put(r1bio->bios[i]); |
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} |
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/* resync pages array stored in the 1st bio's .bi_private */ |
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kfree(rp); |
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rbio_pool_free(r1bio, data); |
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} |
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static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
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{ |
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int i; |
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for (i = 0; i < conf->raid_disks * 2; i++) { |
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struct bio **bio = r1_bio->bios + i; |
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if (!BIO_SPECIAL(*bio)) |
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bio_put(*bio); |
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*bio = NULL; |
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} |
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} |
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static void free_r1bio(struct r1bio *r1_bio) |
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{ |
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struct r1conf *conf = r1_bio->mddev->private; |
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put_all_bios(conf, r1_bio); |
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mempool_free(r1_bio, &conf->r1bio_pool); |
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} |
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static void put_buf(struct r1bio *r1_bio) |
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{ |
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struct r1conf *conf = r1_bio->mddev->private; |
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sector_t sect = r1_bio->sector; |
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int i; |
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for (i = 0; i < conf->raid_disks * 2; i++) { |
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struct bio *bio = r1_bio->bios[i]; |
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if (bio->bi_end_io) |
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rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); |
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} |
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mempool_free(r1_bio, &conf->r1buf_pool); |
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lower_barrier(conf, sect); |
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} |
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static void reschedule_retry(struct r1bio *r1_bio) |
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{ |
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unsigned long flags; |
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struct mddev *mddev = r1_bio->mddev; |
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struct r1conf *conf = mddev->private; |
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int idx; |
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idx = sector_to_idx(r1_bio->sector); |
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spin_lock_irqsave(&conf->device_lock, flags); |
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list_add(&r1_bio->retry_list, &conf->retry_list); |
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atomic_inc(&conf->nr_queued[idx]); |
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spin_unlock_irqrestore(&conf->device_lock, flags); |
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wake_up(&conf->wait_barrier); |
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md_wakeup_thread(mddev->thread); |
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} |
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/* |
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* raid_end_bio_io() is called when we have finished servicing a mirrored |
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* operation and are ready to return a success/failure code to the buffer |
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* cache layer. |
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*/ |
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static void call_bio_endio(struct r1bio *r1_bio) |
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{ |
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struct bio *bio = r1_bio->master_bio; |
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if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
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bio->bi_status = BLK_STS_IOERR; |
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bio_endio(bio); |
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} |
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static void raid_end_bio_io(struct r1bio *r1_bio) |
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{ |
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struct bio *bio = r1_bio->master_bio; |
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struct r1conf *conf = r1_bio->mddev->private; |
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/* if nobody has done the final endio yet, do it now */ |
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if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { |
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pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
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(bio_data_dir(bio) == WRITE) ? "write" : "read", |
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(unsigned long long) bio->bi_iter.bi_sector, |
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(unsigned long long) bio_end_sector(bio) - 1); |
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call_bio_endio(r1_bio); |
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} |
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/* |
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* Wake up any possible resync thread that waits for the device |
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* to go idle. All I/Os, even write-behind writes, are done. |
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*/ |
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allow_barrier(conf, r1_bio->sector); |
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free_r1bio(r1_bio); |
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} |
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/* |
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* Update disk head position estimator based on IRQ completion info. |
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*/ |
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static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
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{ |
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struct r1conf *conf = r1_bio->mddev->private; |
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conf->mirrors[disk].head_position = |
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r1_bio->sector + (r1_bio->sectors); |
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} |
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/* |
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* Find the disk number which triggered given bio |
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*/ |
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static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
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{ |
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int mirror; |
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struct r1conf *conf = r1_bio->mddev->private; |
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int raid_disks = conf->raid_disks; |
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for (mirror = 0; mirror < raid_disks * 2; mirror++) |
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if (r1_bio->bios[mirror] == bio) |
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break; |
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BUG_ON(mirror == raid_disks * 2); |
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update_head_pos(mirror, r1_bio); |
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return mirror; |
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} |
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static void raid1_end_read_request(struct bio *bio) |
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{ |
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int uptodate = !bio->bi_status; |
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struct r1bio *r1_bio = bio->bi_private; |
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struct r1conf *conf = r1_bio->mddev->private; |
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struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
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/* |
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* this branch is our 'one mirror IO has finished' event handler: |
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*/ |
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update_head_pos(r1_bio->read_disk, r1_bio); |
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if (uptodate) |
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set_bit(R1BIO_Uptodate, &r1_bio->state); |
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else if (test_bit(FailFast, &rdev->flags) && |
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test_bit(R1BIO_FailFast, &r1_bio->state)) |
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/* This was a fail-fast read so we definitely |
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* want to retry */ |
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; |
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else { |
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/* If all other devices have failed, we want to return |
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* the error upwards rather than fail the last device. |
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* Here we redefine "uptodate" to mean "Don't want to retry" |
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*/ |
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unsigned long flags; |
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spin_lock_irqsave(&conf->device_lock, flags); |
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if (r1_bio->mddev->degraded == conf->raid_disks || |
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(r1_bio->mddev->degraded == conf->raid_disks-1 && |
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test_bit(In_sync, &rdev->flags))) |
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uptodate = 1; |
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spin_unlock_irqrestore(&conf->device_lock, flags); |
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} |
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|
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if (uptodate) { |
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raid_end_bio_io(r1_bio); |
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rdev_dec_pending(rdev, conf->mddev); |
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} else { |
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/* |
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* oops, read error: |
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*/ |
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char b[BDEVNAME_SIZE]; |
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pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", |
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mdname(conf->mddev), |
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bdevname(rdev->bdev, b), |
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(unsigned long long)r1_bio->sector); |
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set_bit(R1BIO_ReadError, &r1_bio->state); |
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reschedule_retry(r1_bio); |
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/* don't drop the reference on read_disk yet */ |
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} |
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} |
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static void close_write(struct r1bio *r1_bio) |
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{ |
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/* it really is the end of this request */ |
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if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
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bio_free_pages(r1_bio->behind_master_bio); |
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bio_put(r1_bio->behind_master_bio); |
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r1_bio->behind_master_bio = NULL; |
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} |
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/* clear the bitmap if all writes complete successfully */ |
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md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, |
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r1_bio->sectors, |
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!test_bit(R1BIO_Degraded, &r1_bio->state), |
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test_bit(R1BIO_BehindIO, &r1_bio->state)); |
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md_write_end(r1_bio->mddev); |
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} |
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|
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static void r1_bio_write_done(struct r1bio *r1_bio) |
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{ |
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if (!atomic_dec_and_test(&r1_bio->remaining)) |
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return; |
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|
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if (test_bit(R1BIO_WriteError, &r1_bio->state)) |
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reschedule_retry(r1_bio); |
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else { |
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close_write(r1_bio); |
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if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
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reschedule_retry(r1_bio); |
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else |
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raid_end_bio_io(r1_bio); |
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} |
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} |
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|
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static void raid1_end_write_request(struct bio *bio) |
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{ |
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struct r1bio *r1_bio = bio->bi_private; |
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int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
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struct r1conf *conf = r1_bio->mddev->private; |
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struct bio *to_put = NULL; |
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int mirror = find_bio_disk(r1_bio, bio); |
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struct md_rdev *rdev = conf->mirrors[mirror].rdev; |
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bool discard_error; |
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sector_t lo = r1_bio->sector; |
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sector_t hi = r1_bio->sector + r1_bio->sectors; |
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|
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discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
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|
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/* |
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* 'one mirror IO has finished' event handler: |
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*/ |
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if (bio->bi_status && !discard_error) { |
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set_bit(WriteErrorSeen, &rdev->flags); |
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if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
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set_bit(MD_RECOVERY_NEEDED, & |
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conf->mddev->recovery); |
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|
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if (test_bit(FailFast, &rdev->flags) && |
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(bio->bi_opf & MD_FAILFAST) && |
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/* We never try FailFast to WriteMostly devices */ |
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!test_bit(WriteMostly, &rdev->flags)) { |
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md_error(r1_bio->mddev, rdev); |
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} |
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|
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/* |
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* When the device is faulty, it is not necessary to |
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* handle write error. |
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* For failfast, this is the only remaining device, |
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* We need to retry the write without FailFast. |
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*/ |
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if (!test_bit(Faulty, &rdev->flags)) |
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set_bit(R1BIO_WriteError, &r1_bio->state); |
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else { |
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/* Fail the request */ |
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set_bit(R1BIO_Degraded, &r1_bio->state); |
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/* Finished with this branch */ |
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r1_bio->bios[mirror] = NULL; |
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to_put = bio; |
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} |
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} else { |
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/* |
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* Set R1BIO_Uptodate in our master bio, so that we |
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* will return a good error code for to the higher |
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* levels even if IO on some other mirrored buffer |
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* fails. |
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* |
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* The 'master' represents the composite IO operation |
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* to user-side. So if something waits for IO, then it |
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* will wait for the 'master' bio. |
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*/ |
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sector_t first_bad; |
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int bad_sectors; |
|
|
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r1_bio->bios[mirror] = NULL; |
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to_put = bio; |
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/* |
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* Do not set R1BIO_Uptodate if the current device is |
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* rebuilding or Faulty. This is because we cannot use |
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* such device for properly reading the data back (we could |
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* potentially use it, if the current write would have felt |
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* before rdev->recovery_offset, but for simplicity we don't |
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* check this here. |
|
*/ |
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if (test_bit(In_sync, &rdev->flags) && |
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!test_bit(Faulty, &rdev->flags)) |
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set_bit(R1BIO_Uptodate, &r1_bio->state); |
|
|
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/* Maybe we can clear some bad blocks. */ |
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if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
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&first_bad, &bad_sectors) && !discard_error) { |
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r1_bio->bios[mirror] = IO_MADE_GOOD; |
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set_bit(R1BIO_MadeGood, &r1_bio->state); |
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} |
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} |
|
|
|
if (behind) { |
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if (test_bit(CollisionCheck, &rdev->flags)) |
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remove_serial(rdev, lo, hi); |
|
if (test_bit(WriteMostly, &rdev->flags)) |
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atomic_dec(&r1_bio->behind_remaining); |
|
|
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/* |
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* In behind mode, we ACK the master bio once the I/O |
|
* has safely reached all non-writemostly |
|
* disks. Setting the Returned bit ensures that this |
|
* gets done only once -- we don't ever want to return |
|
* -EIO here, instead we'll wait |
|
*/ |
|
if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && |
|
test_bit(R1BIO_Uptodate, &r1_bio->state)) { |
|
/* Maybe we can return now */ |
|
if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { |
|
struct bio *mbio = r1_bio->master_bio; |
|
pr_debug("raid1: behind end write sectors" |
|
" %llu-%llu\n", |
|
(unsigned long long) mbio->bi_iter.bi_sector, |
|
(unsigned long long) bio_end_sector(mbio) - 1); |
|
call_bio_endio(r1_bio); |
|
} |
|
} |
|
} else if (rdev->mddev->serialize_policy) |
|
remove_serial(rdev, lo, hi); |
|
if (r1_bio->bios[mirror] == NULL) |
|
rdev_dec_pending(rdev, conf->mddev); |
|
|
|
/* |
|
* Let's see if all mirrored write operations have finished |
|
* already. |
|
*/ |
|
r1_bio_write_done(r1_bio); |
|
|
|
if (to_put) |
|
bio_put(to_put); |
|
} |
|
|
|
static sector_t align_to_barrier_unit_end(sector_t start_sector, |
|
sector_t sectors) |
|
{ |
|
sector_t len; |
|
|
|
WARN_ON(sectors == 0); |
|
/* |
|
* len is the number of sectors from start_sector to end of the |
|
* barrier unit which start_sector belongs to. |
|
*/ |
|
len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - |
|
start_sector; |
|
|
|
if (len > sectors) |
|
len = sectors; |
|
|
|
return len; |
|
} |
|
|
|
/* |
|
* This routine returns the disk from which the requested read should |
|
* be done. There is a per-array 'next expected sequential IO' sector |
|
* number - if this matches on the next IO then we use the last disk. |
|
* There is also a per-disk 'last know head position' sector that is |
|
* maintained from IRQ contexts, both the normal and the resync IO |
|
* completion handlers update this position correctly. If there is no |
|
* perfect sequential match then we pick the disk whose head is closest. |
|
* |
|
* If there are 2 mirrors in the same 2 devices, performance degrades |
|
* because position is mirror, not device based. |
|
* |
|
* The rdev for the device selected will have nr_pending incremented. |
|
*/ |
|
static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
|
{ |
|
const sector_t this_sector = r1_bio->sector; |
|
int sectors; |
|
int best_good_sectors; |
|
int best_disk, best_dist_disk, best_pending_disk; |
|
int has_nonrot_disk; |
|
int disk; |
|
sector_t best_dist; |
|
unsigned int min_pending; |
|
struct md_rdev *rdev; |
|
int choose_first; |
|
int choose_next_idle; |
|
|
|
rcu_read_lock(); |
|
/* |
|
* Check if we can balance. We can balance on the whole |
|
* device if no resync is going on, or below the resync window. |
|
* We take the first readable disk when above the resync window. |
|
*/ |
|
retry: |
|
sectors = r1_bio->sectors; |
|
best_disk = -1; |
|
best_dist_disk = -1; |
|
best_dist = MaxSector; |
|
best_pending_disk = -1; |
|
min_pending = UINT_MAX; |
|
best_good_sectors = 0; |
|
has_nonrot_disk = 0; |
|
choose_next_idle = 0; |
|
clear_bit(R1BIO_FailFast, &r1_bio->state); |
|
|
|
if ((conf->mddev->recovery_cp < this_sector + sectors) || |
|
(mddev_is_clustered(conf->mddev) && |
|
md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
|
this_sector + sectors))) |
|
choose_first = 1; |
|
else |
|
choose_first = 0; |
|
|
|
for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
|
sector_t dist; |
|
sector_t first_bad; |
|
int bad_sectors; |
|
unsigned int pending; |
|
bool nonrot; |
|
|
|
rdev = rcu_dereference(conf->mirrors[disk].rdev); |
|
if (r1_bio->bios[disk] == IO_BLOCKED |
|
|| rdev == NULL |
|
|| test_bit(Faulty, &rdev->flags)) |
|
continue; |
|
if (!test_bit(In_sync, &rdev->flags) && |
|
rdev->recovery_offset < this_sector + sectors) |
|
continue; |
|
if (test_bit(WriteMostly, &rdev->flags)) { |
|
/* Don't balance among write-mostly, just |
|
* use the first as a last resort */ |
|
if (best_dist_disk < 0) { |
|
if (is_badblock(rdev, this_sector, sectors, |
|
&first_bad, &bad_sectors)) { |
|
if (first_bad <= this_sector) |
|
/* Cannot use this */ |
|
continue; |
|
best_good_sectors = first_bad - this_sector; |
|
} else |
|
best_good_sectors = sectors; |
|
best_dist_disk = disk; |
|
best_pending_disk = disk; |
|
} |
|
continue; |
|
} |
|
/* This is a reasonable device to use. It might |
|
* even be best. |
|
*/ |
|
if (is_badblock(rdev, this_sector, sectors, |
|
&first_bad, &bad_sectors)) { |
|
if (best_dist < MaxSector) |
|
/* already have a better device */ |
|
continue; |
|
if (first_bad <= this_sector) { |
|
/* cannot read here. If this is the 'primary' |
|
* device, then we must not read beyond |
|
* bad_sectors from another device.. |
|
*/ |
|
bad_sectors -= (this_sector - first_bad); |
|
if (choose_first && sectors > bad_sectors) |
|
sectors = bad_sectors; |
|
if (best_good_sectors > sectors) |
|
best_good_sectors = sectors; |
|
|
|
} else { |
|
sector_t good_sectors = first_bad - this_sector; |
|
if (good_sectors > best_good_sectors) { |
|
best_good_sectors = good_sectors; |
|
best_disk = disk; |
|
} |
|
if (choose_first) |
|
break; |
|
} |
|
continue; |
|
} else { |
|
if ((sectors > best_good_sectors) && (best_disk >= 0)) |
|
best_disk = -1; |
|
best_good_sectors = sectors; |
|
} |
|
|
|
if (best_disk >= 0) |
|
/* At least two disks to choose from so failfast is OK */ |
|
set_bit(R1BIO_FailFast, &r1_bio->state); |
|
|
|
nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
|
has_nonrot_disk |= nonrot; |
|
pending = atomic_read(&rdev->nr_pending); |
|
dist = abs(this_sector - conf->mirrors[disk].head_position); |
|
if (choose_first) { |
|
best_disk = disk; |
|
break; |
|
} |
|
/* Don't change to another disk for sequential reads */ |
|
if (conf->mirrors[disk].next_seq_sect == this_sector |
|
|| dist == 0) { |
|
int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; |
|
struct raid1_info *mirror = &conf->mirrors[disk]; |
|
|
|
best_disk = disk; |
|
/* |
|
* If buffered sequential IO size exceeds optimal |
|
* iosize, check if there is idle disk. If yes, choose |
|
* the idle disk. read_balance could already choose an |
|
* idle disk before noticing it's a sequential IO in |
|
* this disk. This doesn't matter because this disk |
|
* will idle, next time it will be utilized after the |
|
* first disk has IO size exceeds optimal iosize. In |
|
* this way, iosize of the first disk will be optimal |
|
* iosize at least. iosize of the second disk might be |
|
* small, but not a big deal since when the second disk |
|
* starts IO, the first disk is likely still busy. |
|
*/ |
|
if (nonrot && opt_iosize > 0 && |
|
mirror->seq_start != MaxSector && |
|
mirror->next_seq_sect > opt_iosize && |
|
mirror->next_seq_sect - opt_iosize >= |
|
mirror->seq_start) { |
|
choose_next_idle = 1; |
|
continue; |
|
} |
|
break; |
|
} |
|
|
|
if (choose_next_idle) |
|
continue; |
|
|
|
if (min_pending > pending) { |
|
min_pending = pending; |
|
best_pending_disk = disk; |
|
} |
|
|
|
if (dist < best_dist) { |
|
best_dist = dist; |
|
best_dist_disk = disk; |
|
} |
|
} |
|
|
|
/* |
|
* If all disks are rotational, choose the closest disk. If any disk is |
|
* non-rotational, choose the disk with less pending request even the |
|
* disk is rotational, which might/might not be optimal for raids with |
|
* mixed ratation/non-rotational disks depending on workload. |
|
*/ |
|
if (best_disk == -1) { |
|
if (has_nonrot_disk || min_pending == 0) |
|
best_disk = best_pending_disk; |
|
else |
|
best_disk = best_dist_disk; |
|
} |
|
|
|
if (best_disk >= 0) { |
|
rdev = rcu_dereference(conf->mirrors[best_disk].rdev); |
|
if (!rdev) |
|
goto retry; |
|
atomic_inc(&rdev->nr_pending); |
|
sectors = best_good_sectors; |
|
|
|
if (conf->mirrors[best_disk].next_seq_sect != this_sector) |
|
conf->mirrors[best_disk].seq_start = this_sector; |
|
|
|
conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
|
} |
|
rcu_read_unlock(); |
|
*max_sectors = sectors; |
|
|
|
return best_disk; |
|
} |
|
|
|
static void flush_bio_list(struct r1conf *conf, struct bio *bio) |
|
{ |
|
/* flush any pending bitmap writes to disk before proceeding w/ I/O */ |
|
md_bitmap_unplug(conf->mddev->bitmap); |
|
wake_up(&conf->wait_barrier); |
|
|
|
while (bio) { /* submit pending writes */ |
|
struct bio *next = bio->bi_next; |
|
struct md_rdev *rdev = (void *)bio->bi_bdev; |
|
bio->bi_next = NULL; |
|
bio_set_dev(bio, rdev->bdev); |
|
if (test_bit(Faulty, &rdev->flags)) { |
|
bio_io_error(bio); |
|
} else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
|
!blk_queue_discard(bio->bi_bdev->bd_disk->queue))) |
|
/* Just ignore it */ |
|
bio_endio(bio); |
|
else |
|
submit_bio_noacct(bio); |
|
bio = next; |
|
cond_resched(); |
|
} |
|
} |
|
|
|
static void flush_pending_writes(struct r1conf *conf) |
|
{ |
|
/* Any writes that have been queued but are awaiting |
|
* bitmap updates get flushed here. |
|
*/ |
|
spin_lock_irq(&conf->device_lock); |
|
|
|
if (conf->pending_bio_list.head) { |
|
struct blk_plug plug; |
|
struct bio *bio; |
|
|
|
bio = bio_list_get(&conf->pending_bio_list); |
|
conf->pending_count = 0; |
|
spin_unlock_irq(&conf->device_lock); |
|
|
|
/* |
|
* As this is called in a wait_event() loop (see freeze_array), |
|
* current->state might be TASK_UNINTERRUPTIBLE which will |
|
* cause a warning when we prepare to wait again. As it is |
|
* rare that this path is taken, it is perfectly safe to force |
|
* us to go around the wait_event() loop again, so the warning |
|
* is a false-positive. Silence the warning by resetting |
|
* thread state |
|
*/ |
|
__set_current_state(TASK_RUNNING); |
|
blk_start_plug(&plug); |
|
flush_bio_list(conf, bio); |
|
blk_finish_plug(&plug); |
|
} else |
|
spin_unlock_irq(&conf->device_lock); |
|
} |
|
|
|
/* Barriers.... |
|
* Sometimes we need to suspend IO while we do something else, |
|
* either some resync/recovery, or reconfigure the array. |
|
* To do this we raise a 'barrier'. |
|
* The 'barrier' is a counter that can be raised multiple times |
|
* to count how many activities are happening which preclude |
|
* normal IO. |
|
* We can only raise the barrier if there is no pending IO. |
|
* i.e. if nr_pending == 0. |
|
* We choose only to raise the barrier if no-one is waiting for the |
|
* barrier to go down. This means that as soon as an IO request |
|
* is ready, no other operations which require a barrier will start |
|
* until the IO request has had a chance. |
|
* |
|
* So: regular IO calls 'wait_barrier'. When that returns there |
|
* is no backgroup IO happening, It must arrange to call |
|
* allow_barrier when it has finished its IO. |
|
* backgroup IO calls must call raise_barrier. Once that returns |
|
* there is no normal IO happeing. It must arrange to call |
|
* lower_barrier when the particular background IO completes. |
|
* |
|
* If resync/recovery is interrupted, returns -EINTR; |
|
* Otherwise, returns 0. |
|
*/ |
|
static int raise_barrier(struct r1conf *conf, sector_t sector_nr) |
|
{ |
|
int idx = sector_to_idx(sector_nr); |
|
|
|
spin_lock_irq(&conf->resync_lock); |
|
|
|
/* Wait until no block IO is waiting */ |
|
wait_event_lock_irq(conf->wait_barrier, |
|
!atomic_read(&conf->nr_waiting[idx]), |
|
conf->resync_lock); |
|
|
|
/* block any new IO from starting */ |
|
atomic_inc(&conf->barrier[idx]); |
|
/* |
|
* In raise_barrier() we firstly increase conf->barrier[idx] then |
|
* check conf->nr_pending[idx]. In _wait_barrier() we firstly |
|
* increase conf->nr_pending[idx] then check conf->barrier[idx]. |
|
* A memory barrier here to make sure conf->nr_pending[idx] won't |
|
* be fetched before conf->barrier[idx] is increased. Otherwise |
|
* there will be a race between raise_barrier() and _wait_barrier(). |
|
*/ |
|
smp_mb__after_atomic(); |
|
|
|
/* For these conditions we must wait: |
|
* A: while the array is in frozen state |
|
* B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
|
* existing in corresponding I/O barrier bucket. |
|
* C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches |
|
* max resync count which allowed on current I/O barrier bucket. |
|
*/ |
|
wait_event_lock_irq(conf->wait_barrier, |
|
(!conf->array_frozen && |
|
!atomic_read(&conf->nr_pending[idx]) && |
|
atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || |
|
test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), |
|
conf->resync_lock); |
|
|
|
if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
|
atomic_dec(&conf->barrier[idx]); |
|
spin_unlock_irq(&conf->resync_lock); |
|
wake_up(&conf->wait_barrier); |
|
return -EINTR; |
|
} |
|
|
|
atomic_inc(&conf->nr_sync_pending); |
|
spin_unlock_irq(&conf->resync_lock); |
|
|
|
return 0; |
|
} |
|
|
|
static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
|
{ |
|
int idx = sector_to_idx(sector_nr); |
|
|
|
BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
|
|
|
atomic_dec(&conf->barrier[idx]); |
|
atomic_dec(&conf->nr_sync_pending); |
|
wake_up(&conf->wait_barrier); |
|
} |
|
|
|
static void _wait_barrier(struct r1conf *conf, int idx) |
|
{ |
|
/* |
|
* We need to increase conf->nr_pending[idx] very early here, |
|
* then raise_barrier() can be blocked when it waits for |
|
* conf->nr_pending[idx] to be 0. Then we can avoid holding |
|
* conf->resync_lock when there is no barrier raised in same |
|
* barrier unit bucket. Also if the array is frozen, I/O |
|
* should be blocked until array is unfrozen. |
|
*/ |
|
atomic_inc(&conf->nr_pending[idx]); |
|
/* |
|
* In _wait_barrier() we firstly increase conf->nr_pending[idx], then |
|
* check conf->barrier[idx]. In raise_barrier() we firstly increase |
|
* conf->barrier[idx], then check conf->nr_pending[idx]. A memory |
|
* barrier is necessary here to make sure conf->barrier[idx] won't be |
|
* fetched before conf->nr_pending[idx] is increased. Otherwise there |
|
* will be a race between _wait_barrier() and raise_barrier(). |
|
*/ |
|
smp_mb__after_atomic(); |
|
|
|
/* |
|
* Don't worry about checking two atomic_t variables at same time |
|
* here. If during we check conf->barrier[idx], the array is |
|
* frozen (conf->array_frozen is 1), and chonf->barrier[idx] is |
|
* 0, it is safe to return and make the I/O continue. Because the |
|
* array is frozen, all I/O returned here will eventually complete |
|
* or be queued, no race will happen. See code comment in |
|
* frozen_array(). |
|
*/ |
|
if (!READ_ONCE(conf->array_frozen) && |
|
!atomic_read(&conf->barrier[idx])) |
|
return; |
|
|
|
/* |
|
* After holding conf->resync_lock, conf->nr_pending[idx] |
|
* should be decreased before waiting for barrier to drop. |
|
* Otherwise, we may encounter a race condition because |
|
* raise_barrer() might be waiting for conf->nr_pending[idx] |
|
* to be 0 at same time. |
|
*/ |
|
spin_lock_irq(&conf->resync_lock); |
|
atomic_inc(&conf->nr_waiting[idx]); |
|
atomic_dec(&conf->nr_pending[idx]); |
|
/* |
|
* In case freeze_array() is waiting for |
|
* get_unqueued_pending() == extra |
|
*/ |
|
wake_up(&conf->wait_barrier); |
|
/* Wait for the barrier in same barrier unit bucket to drop. */ |
|
wait_event_lock_irq(conf->wait_barrier, |
|
!conf->array_frozen && |
|
!atomic_read(&conf->barrier[idx]), |
|
conf->resync_lock); |
|
atomic_inc(&conf->nr_pending[idx]); |
|
atomic_dec(&conf->nr_waiting[idx]); |
|
spin_unlock_irq(&conf->resync_lock); |
|
} |
|
|
|
static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) |
|
{ |
|
int idx = sector_to_idx(sector_nr); |
|
|
|
/* |
|
* Very similar to _wait_barrier(). The difference is, for read |
|
* I/O we don't need wait for sync I/O, but if the whole array |
|
* is frozen, the read I/O still has to wait until the array is |
|
* unfrozen. Since there is no ordering requirement with |
|
* conf->barrier[idx] here, memory barrier is unnecessary as well. |
|
*/ |
|
atomic_inc(&conf->nr_pending[idx]); |
|
|
|
if (!READ_ONCE(conf->array_frozen)) |
|
return; |
|
|
|
spin_lock_irq(&conf->resync_lock); |
|
atomic_inc(&conf->nr_waiting[idx]); |
|
atomic_dec(&conf->nr_pending[idx]); |
|
/* |
|
* In case freeze_array() is waiting for |
|
* get_unqueued_pending() == extra |
|
*/ |
|
wake_up(&conf->wait_barrier); |
|
/* Wait for array to be unfrozen */ |
|
wait_event_lock_irq(conf->wait_barrier, |
|
!conf->array_frozen, |
|
conf->resync_lock); |
|
atomic_inc(&conf->nr_pending[idx]); |
|
atomic_dec(&conf->nr_waiting[idx]); |
|
spin_unlock_irq(&conf->resync_lock); |
|
} |
|
|
|
static void wait_barrier(struct r1conf *conf, sector_t sector_nr) |
|
{ |
|
int idx = sector_to_idx(sector_nr); |
|
|
|
_wait_barrier(conf, idx); |
|
} |
|
|
|
static void _allow_barrier(struct r1conf *conf, int idx) |
|
{ |
|
atomic_dec(&conf->nr_pending[idx]); |
|
wake_up(&conf->wait_barrier); |
|
} |
|
|
|
static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
|
{ |
|
int idx = sector_to_idx(sector_nr); |
|
|
|
_allow_barrier(conf, idx); |
|
} |
|
|
|
/* conf->resync_lock should be held */ |
|
static int get_unqueued_pending(struct r1conf *conf) |
|
{ |
|
int idx, ret; |
|
|
|
ret = atomic_read(&conf->nr_sync_pending); |
|
for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) |
|
ret += atomic_read(&conf->nr_pending[idx]) - |
|
atomic_read(&conf->nr_queued[idx]); |
|
|
|
return ret; |
|
} |
|
|
|
static void freeze_array(struct r1conf *conf, int extra) |
|
{ |
|
/* Stop sync I/O and normal I/O and wait for everything to |
|
* go quiet. |
|
* This is called in two situations: |
|
* 1) management command handlers (reshape, remove disk, quiesce). |
|
* 2) one normal I/O request failed. |
|
|
|
* After array_frozen is set to 1, new sync IO will be blocked at |
|
* raise_barrier(), and new normal I/O will blocked at _wait_barrier() |
|
* or wait_read_barrier(). The flying I/Os will either complete or be |
|
* queued. When everything goes quite, there are only queued I/Os left. |
|
|
|
* Every flying I/O contributes to a conf->nr_pending[idx], idx is the |
|
* barrier bucket index which this I/O request hits. When all sync and |
|
* normal I/O are queued, sum of all conf->nr_pending[] will match sum |
|
* of all conf->nr_queued[]. But normal I/O failure is an exception, |
|
* in handle_read_error(), we may call freeze_array() before trying to |
|
* fix the read error. In this case, the error read I/O is not queued, |
|
* so get_unqueued_pending() == 1. |
|
* |
|
* Therefore before this function returns, we need to wait until |
|
* get_unqueued_pendings(conf) gets equal to extra. For |
|
* normal I/O context, extra is 1, in rested situations extra is 0. |
|
*/ |
|
spin_lock_irq(&conf->resync_lock); |
|
conf->array_frozen = 1; |
|
raid1_log(conf->mddev, "wait freeze"); |
|
wait_event_lock_irq_cmd( |
|
conf->wait_barrier, |
|
get_unqueued_pending(conf) == extra, |
|
conf->resync_lock, |
|
flush_pending_writes(conf)); |
|
spin_unlock_irq(&conf->resync_lock); |
|
} |
|
static void unfreeze_array(struct r1conf *conf) |
|
{ |
|
/* reverse the effect of the freeze */ |
|
spin_lock_irq(&conf->resync_lock); |
|
conf->array_frozen = 0; |
|
spin_unlock_irq(&conf->resync_lock); |
|
wake_up(&conf->wait_barrier); |
|
} |
|
|
|
static void alloc_behind_master_bio(struct r1bio *r1_bio, |
|
struct bio *bio) |
|
{ |
|
int size = bio->bi_iter.bi_size; |
|
unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
|
int i = 0; |
|
struct bio *behind_bio = NULL; |
|
|
|
behind_bio = bio_alloc_bioset(GFP_NOIO, vcnt, &r1_bio->mddev->bio_set); |
|
if (!behind_bio) |
|
return; |
|
|
|
/* discard op, we don't support writezero/writesame yet */ |
|
if (!bio_has_data(bio)) { |
|
behind_bio->bi_iter.bi_size = size; |
|
goto skip_copy; |
|
} |
|
|
|
behind_bio->bi_write_hint = bio->bi_write_hint; |
|
|
|
while (i < vcnt && size) { |
|
struct page *page; |
|
int len = min_t(int, PAGE_SIZE, size); |
|
|
|
page = alloc_page(GFP_NOIO); |
|
if (unlikely(!page)) |
|
goto free_pages; |
|
|
|
bio_add_page(behind_bio, page, len, 0); |
|
|
|
size -= len; |
|
i++; |
|
} |
|
|
|
bio_copy_data(behind_bio, bio); |
|
skip_copy: |
|
r1_bio->behind_master_bio = behind_bio; |
|
set_bit(R1BIO_BehindIO, &r1_bio->state); |
|
|
|
return; |
|
|
|
free_pages: |
|
pr_debug("%dB behind alloc failed, doing sync I/O\n", |
|
bio->bi_iter.bi_size); |
|
bio_free_pages(behind_bio); |
|
bio_put(behind_bio); |
|
} |
|
|
|
struct raid1_plug_cb { |
|
struct blk_plug_cb cb; |
|
struct bio_list pending; |
|
int pending_cnt; |
|
}; |
|
|
|
static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) |
|
{ |
|
struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, |
|
cb); |
|
struct mddev *mddev = plug->cb.data; |
|
struct r1conf *conf = mddev->private; |
|
struct bio *bio; |
|
|
|
if (from_schedule || current->bio_list) { |
|
spin_lock_irq(&conf->device_lock); |
|
bio_list_merge(&conf->pending_bio_list, &plug->pending); |
|
conf->pending_count += plug->pending_cnt; |
|
spin_unlock_irq(&conf->device_lock); |
|
wake_up(&conf->wait_barrier); |
|
md_wakeup_thread(mddev->thread); |
|
kfree(plug); |
|
return; |
|
} |
|
|
|
/* we aren't scheduling, so we can do the write-out directly. */ |
|
bio = bio_list_get(&plug->pending); |
|
flush_bio_list(conf, bio); |
|
kfree(plug); |
|
} |
|
|
|
static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) |
|
{ |
|
r1_bio->master_bio = bio; |
|
r1_bio->sectors = bio_sectors(bio); |
|
r1_bio->state = 0; |
|
r1_bio->mddev = mddev; |
|
r1_bio->sector = bio->bi_iter.bi_sector; |
|
} |
|
|
|
static inline struct r1bio * |
|
alloc_r1bio(struct mddev *mddev, struct bio *bio) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
struct r1bio *r1_bio; |
|
|
|
r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); |
|
/* Ensure no bio records IO_BLOCKED */ |
|
memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); |
|
init_r1bio(r1_bio, mddev, bio); |
|
return r1_bio; |
|
} |
|
|
|
static void raid1_read_request(struct mddev *mddev, struct bio *bio, |
|
int max_read_sectors, struct r1bio *r1_bio) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
struct raid1_info *mirror; |
|
struct bio *read_bio; |
|
struct bitmap *bitmap = mddev->bitmap; |
|
const int op = bio_op(bio); |
|
const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); |
|
int max_sectors; |
|
int rdisk; |
|
bool print_msg = !!r1_bio; |
|
char b[BDEVNAME_SIZE]; |
|
|
|
/* |
|
* If r1_bio is set, we are blocking the raid1d thread |
|
* so there is a tiny risk of deadlock. So ask for |
|
* emergency memory if needed. |
|
*/ |
|
gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; |
|
|
|
if (print_msg) { |
|
/* Need to get the block device name carefully */ |
|
struct md_rdev *rdev; |
|
rcu_read_lock(); |
|
rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); |
|
if (rdev) |
|
bdevname(rdev->bdev, b); |
|
else |
|
strcpy(b, "???"); |
|
rcu_read_unlock(); |
|
} |
|
|
|
/* |
|
* Still need barrier for READ in case that whole |
|
* array is frozen. |
|
*/ |
|
wait_read_barrier(conf, bio->bi_iter.bi_sector); |
|
|
|
if (!r1_bio) |
|
r1_bio = alloc_r1bio(mddev, bio); |
|
else |
|
init_r1bio(r1_bio, mddev, bio); |
|
r1_bio->sectors = max_read_sectors; |
|
|
|
/* |
|
* make_request() can abort the operation when read-ahead is being |
|
* used and no empty request is available. |
|
*/ |
|
rdisk = read_balance(conf, r1_bio, &max_sectors); |
|
|
|
if (rdisk < 0) { |
|
/* couldn't find anywhere to read from */ |
|
if (print_msg) { |
|
pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
|
mdname(mddev), |
|
b, |
|
(unsigned long long)r1_bio->sector); |
|
} |
|
raid_end_bio_io(r1_bio); |
|
return; |
|
} |
|
mirror = conf->mirrors + rdisk; |
|
|
|
if (print_msg) |
|
pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", |
|
mdname(mddev), |
|
(unsigned long long)r1_bio->sector, |
|
bdevname(mirror->rdev->bdev, b)); |
|
|
|
if (test_bit(WriteMostly, &mirror->rdev->flags) && |
|
bitmap) { |
|
/* |
|
* Reading from a write-mostly device must take care not to |
|
* over-take any writes that are 'behind' |
|
*/ |
|
raid1_log(mddev, "wait behind writes"); |
|
wait_event(bitmap->behind_wait, |
|
atomic_read(&bitmap->behind_writes) == 0); |
|
} |
|
|
|
if (max_sectors < bio_sectors(bio)) { |
|
struct bio *split = bio_split(bio, max_sectors, |
|
gfp, &conf->bio_split); |
|
bio_chain(split, bio); |
|
submit_bio_noacct(bio); |
|
bio = split; |
|
r1_bio->master_bio = bio; |
|
r1_bio->sectors = max_sectors; |
|
} |
|
|
|
r1_bio->read_disk = rdisk; |
|
|
|
read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set); |
|
|
|
r1_bio->bios[rdisk] = read_bio; |
|
|
|
read_bio->bi_iter.bi_sector = r1_bio->sector + |
|
mirror->rdev->data_offset; |
|
bio_set_dev(read_bio, mirror->rdev->bdev); |
|
read_bio->bi_end_io = raid1_end_read_request; |
|
bio_set_op_attrs(read_bio, op, do_sync); |
|
if (test_bit(FailFast, &mirror->rdev->flags) && |
|
test_bit(R1BIO_FailFast, &r1_bio->state)) |
|
read_bio->bi_opf |= MD_FAILFAST; |
|
read_bio->bi_private = r1_bio; |
|
|
|
if (mddev->gendisk) |
|
trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk), |
|
r1_bio->sector); |
|
|
|
submit_bio_noacct(read_bio); |
|
} |
|
|
|
static void raid1_write_request(struct mddev *mddev, struct bio *bio, |
|
int max_write_sectors) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
struct r1bio *r1_bio; |
|
int i, disks; |
|
struct bitmap *bitmap = mddev->bitmap; |
|
unsigned long flags; |
|
struct md_rdev *blocked_rdev; |
|
struct blk_plug_cb *cb; |
|
struct raid1_plug_cb *plug = NULL; |
|
int first_clone; |
|
int max_sectors; |
|
|
|
if (mddev_is_clustered(mddev) && |
|
md_cluster_ops->area_resyncing(mddev, WRITE, |
|
bio->bi_iter.bi_sector, bio_end_sector(bio))) { |
|
|
|
DEFINE_WAIT(w); |
|
for (;;) { |
|
prepare_to_wait(&conf->wait_barrier, |
|
&w, TASK_IDLE); |
|
if (!md_cluster_ops->area_resyncing(mddev, WRITE, |
|
bio->bi_iter.bi_sector, |
|
bio_end_sector(bio))) |
|
break; |
|
schedule(); |
|
} |
|
finish_wait(&conf->wait_barrier, &w); |
|
} |
|
|
|
/* |
|
* Register the new request and wait if the reconstruction |
|
* thread has put up a bar for new requests. |
|
* Continue immediately if no resync is active currently. |
|
*/ |
|
wait_barrier(conf, bio->bi_iter.bi_sector); |
|
|
|
r1_bio = alloc_r1bio(mddev, bio); |
|
r1_bio->sectors = max_write_sectors; |
|
|
|
if (conf->pending_count >= max_queued_requests) { |
|
md_wakeup_thread(mddev->thread); |
|
raid1_log(mddev, "wait queued"); |
|
wait_event(conf->wait_barrier, |
|
conf->pending_count < max_queued_requests); |
|
} |
|
/* first select target devices under rcu_lock and |
|
* inc refcount on their rdev. Record them by setting |
|
* bios[x] to bio |
|
* If there are known/acknowledged bad blocks on any device on |
|
* which we have seen a write error, we want to avoid writing those |
|
* blocks. |
|
* This potentially requires several writes to write around |
|
* the bad blocks. Each set of writes gets it's own r1bio |
|
* with a set of bios attached. |
|
*/ |
|
|
|
disks = conf->raid_disks * 2; |
|
retry_write: |
|
blocked_rdev = NULL; |
|
rcu_read_lock(); |
|
max_sectors = r1_bio->sectors; |
|
for (i = 0; i < disks; i++) { |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
|
if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
|
atomic_inc(&rdev->nr_pending); |
|
blocked_rdev = rdev; |
|
break; |
|
} |
|
r1_bio->bios[i] = NULL; |
|
if (!rdev || test_bit(Faulty, &rdev->flags)) { |
|
if (i < conf->raid_disks) |
|
set_bit(R1BIO_Degraded, &r1_bio->state); |
|
continue; |
|
} |
|
|
|
atomic_inc(&rdev->nr_pending); |
|
if (test_bit(WriteErrorSeen, &rdev->flags)) { |
|
sector_t first_bad; |
|
int bad_sectors; |
|
int is_bad; |
|
|
|
is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
|
&first_bad, &bad_sectors); |
|
if (is_bad < 0) { |
|
/* mustn't write here until the bad block is |
|
* acknowledged*/ |
|
set_bit(BlockedBadBlocks, &rdev->flags); |
|
blocked_rdev = rdev; |
|
break; |
|
} |
|
if (is_bad && first_bad <= r1_bio->sector) { |
|
/* Cannot write here at all */ |
|
bad_sectors -= (r1_bio->sector - first_bad); |
|
if (bad_sectors < max_sectors) |
|
/* mustn't write more than bad_sectors |
|
* to other devices yet |
|
*/ |
|
max_sectors = bad_sectors; |
|
rdev_dec_pending(rdev, mddev); |
|
/* We don't set R1BIO_Degraded as that |
|
* only applies if the disk is |
|
* missing, so it might be re-added, |
|
* and we want to know to recover this |
|
* chunk. |
|
* In this case the device is here, |
|
* and the fact that this chunk is not |
|
* in-sync is recorded in the bad |
|
* block log |
|
*/ |
|
continue; |
|
} |
|
if (is_bad) { |
|
int good_sectors = first_bad - r1_bio->sector; |
|
if (good_sectors < max_sectors) |
|
max_sectors = good_sectors; |
|
} |
|
} |
|
r1_bio->bios[i] = bio; |
|
} |
|
rcu_read_unlock(); |
|
|
|
if (unlikely(blocked_rdev)) { |
|
/* Wait for this device to become unblocked */ |
|
int j; |
|
|
|
for (j = 0; j < i; j++) |
|
if (r1_bio->bios[j]) |
|
rdev_dec_pending(conf->mirrors[j].rdev, mddev); |
|
r1_bio->state = 0; |
|
allow_barrier(conf, bio->bi_iter.bi_sector); |
|
raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
|
md_wait_for_blocked_rdev(blocked_rdev, mddev); |
|
wait_barrier(conf, bio->bi_iter.bi_sector); |
|
goto retry_write; |
|
} |
|
|
|
if (max_sectors < bio_sectors(bio)) { |
|
struct bio *split = bio_split(bio, max_sectors, |
|
GFP_NOIO, &conf->bio_split); |
|
bio_chain(split, bio); |
|
submit_bio_noacct(bio); |
|
bio = split; |
|
r1_bio->master_bio = bio; |
|
r1_bio->sectors = max_sectors; |
|
} |
|
|
|
atomic_set(&r1_bio->remaining, 1); |
|
atomic_set(&r1_bio->behind_remaining, 0); |
|
|
|
first_clone = 1; |
|
|
|
for (i = 0; i < disks; i++) { |
|
struct bio *mbio = NULL; |
|
struct md_rdev *rdev = conf->mirrors[i].rdev; |
|
if (!r1_bio->bios[i]) |
|
continue; |
|
|
|
if (first_clone) { |
|
/* do behind I/O ? |
|
* Not if there are too many, or cannot |
|
* allocate memory, or a reader on WriteMostly |
|
* is waiting for behind writes to flush */ |
|
if (bitmap && |
|
(atomic_read(&bitmap->behind_writes) |
|
< mddev->bitmap_info.max_write_behind) && |
|
!waitqueue_active(&bitmap->behind_wait)) { |
|
alloc_behind_master_bio(r1_bio, bio); |
|
} |
|
|
|
md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, |
|
test_bit(R1BIO_BehindIO, &r1_bio->state)); |
|
first_clone = 0; |
|
} |
|
|
|
if (r1_bio->behind_master_bio) |
|
mbio = bio_clone_fast(r1_bio->behind_master_bio, |
|
GFP_NOIO, &mddev->bio_set); |
|
else |
|
mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); |
|
|
|
if (r1_bio->behind_master_bio) { |
|
if (test_bit(CollisionCheck, &rdev->flags)) |
|
wait_for_serialization(rdev, r1_bio); |
|
if (test_bit(WriteMostly, &rdev->flags)) |
|
atomic_inc(&r1_bio->behind_remaining); |
|
} else if (mddev->serialize_policy) |
|
wait_for_serialization(rdev, r1_bio); |
|
|
|
r1_bio->bios[i] = mbio; |
|
|
|
mbio->bi_iter.bi_sector = (r1_bio->sector + |
|
conf->mirrors[i].rdev->data_offset); |
|
bio_set_dev(mbio, conf->mirrors[i].rdev->bdev); |
|
mbio->bi_end_io = raid1_end_write_request; |
|
mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
|
if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && |
|
!test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && |
|
conf->raid_disks - mddev->degraded > 1) |
|
mbio->bi_opf |= MD_FAILFAST; |
|
mbio->bi_private = r1_bio; |
|
|
|
atomic_inc(&r1_bio->remaining); |
|
|
|
if (mddev->gendisk) |
|
trace_block_bio_remap(mbio, disk_devt(mddev->gendisk), |
|
r1_bio->sector); |
|
/* flush_pending_writes() needs access to the rdev so...*/ |
|
mbio->bi_bdev = (void *)conf->mirrors[i].rdev; |
|
|
|
cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); |
|
if (cb) |
|
plug = container_of(cb, struct raid1_plug_cb, cb); |
|
else |
|
plug = NULL; |
|
if (plug) { |
|
bio_list_add(&plug->pending, mbio); |
|
plug->pending_cnt++; |
|
} else { |
|
spin_lock_irqsave(&conf->device_lock, flags); |
|
bio_list_add(&conf->pending_bio_list, mbio); |
|
conf->pending_count++; |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
md_wakeup_thread(mddev->thread); |
|
} |
|
} |
|
|
|
r1_bio_write_done(r1_bio); |
|
|
|
/* In case raid1d snuck in to freeze_array */ |
|
wake_up(&conf->wait_barrier); |
|
} |
|
|
|
static bool raid1_make_request(struct mddev *mddev, struct bio *bio) |
|
{ |
|
sector_t sectors; |
|
|
|
if (unlikely(bio->bi_opf & REQ_PREFLUSH) |
|
&& md_flush_request(mddev, bio)) |
|
return true; |
|
|
|
/* |
|
* There is a limit to the maximum size, but |
|
* the read/write handler might find a lower limit |
|
* due to bad blocks. To avoid multiple splits, |
|
* we pass the maximum number of sectors down |
|
* and let the lower level perform the split. |
|
*/ |
|
sectors = align_to_barrier_unit_end( |
|
bio->bi_iter.bi_sector, bio_sectors(bio)); |
|
|
|
if (bio_data_dir(bio) == READ) |
|
raid1_read_request(mddev, bio, sectors, NULL); |
|
else { |
|
if (!md_write_start(mddev,bio)) |
|
return false; |
|
raid1_write_request(mddev, bio, sectors); |
|
} |
|
return true; |
|
} |
|
|
|
static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
int i; |
|
|
|
seq_printf(seq, " [%d/%d] [", conf->raid_disks, |
|
conf->raid_disks - mddev->degraded); |
|
rcu_read_lock(); |
|
for (i = 0; i < conf->raid_disks; i++) { |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
|
seq_printf(seq, "%s", |
|
rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
|
} |
|
rcu_read_unlock(); |
|
seq_printf(seq, "]"); |
|
} |
|
|
|
static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
char b[BDEVNAME_SIZE]; |
|
struct r1conf *conf = mddev->private; |
|
unsigned long flags; |
|
|
|
/* |
|
* If it is not operational, then we have already marked it as dead |
|
* else if it is the last working disks with "fail_last_dev == false", |
|
* ignore the error, let the next level up know. |
|
* else mark the drive as failed |
|
*/ |
|
spin_lock_irqsave(&conf->device_lock, flags); |
|
if (test_bit(In_sync, &rdev->flags) && !mddev->fail_last_dev |
|
&& (conf->raid_disks - mddev->degraded) == 1) { |
|
/* |
|
* Don't fail the drive, act as though we were just a |
|
* normal single drive. |
|
* However don't try a recovery from this drive as |
|
* it is very likely to fail. |
|
*/ |
|
conf->recovery_disabled = mddev->recovery_disabled; |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
return; |
|
} |
|
set_bit(Blocked, &rdev->flags); |
|
if (test_and_clear_bit(In_sync, &rdev->flags)) |
|
mddev->degraded++; |
|
set_bit(Faulty, &rdev->flags); |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
/* |
|
* if recovery is running, make sure it aborts. |
|
*/ |
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
|
set_mask_bits(&mddev->sb_flags, 0, |
|
BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); |
|
pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" |
|
"md/raid1:%s: Operation continuing on %d devices.\n", |
|
mdname(mddev), bdevname(rdev->bdev, b), |
|
mdname(mddev), conf->raid_disks - mddev->degraded); |
|
} |
|
|
|
static void print_conf(struct r1conf *conf) |
|
{ |
|
int i; |
|
|
|
pr_debug("RAID1 conf printout:\n"); |
|
if (!conf) { |
|
pr_debug("(!conf)\n"); |
|
return; |
|
} |
|
pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
|
conf->raid_disks); |
|
|
|
rcu_read_lock(); |
|
for (i = 0; i < conf->raid_disks; i++) { |
|
char b[BDEVNAME_SIZE]; |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
|
if (rdev) |
|
pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
|
i, !test_bit(In_sync, &rdev->flags), |
|
!test_bit(Faulty, &rdev->flags), |
|
bdevname(rdev->bdev,b)); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void close_sync(struct r1conf *conf) |
|
{ |
|
int idx; |
|
|
|
for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { |
|
_wait_barrier(conf, idx); |
|
_allow_barrier(conf, idx); |
|
} |
|
|
|
mempool_exit(&conf->r1buf_pool); |
|
} |
|
|
|
static int raid1_spare_active(struct mddev *mddev) |
|
{ |
|
int i; |
|
struct r1conf *conf = mddev->private; |
|
int count = 0; |
|
unsigned long flags; |
|
|
|
/* |
|
* Find all failed disks within the RAID1 configuration |
|
* and mark them readable. |
|
* Called under mddev lock, so rcu protection not needed. |
|
* device_lock used to avoid races with raid1_end_read_request |
|
* which expects 'In_sync' flags and ->degraded to be consistent. |
|
*/ |
|
spin_lock_irqsave(&conf->device_lock, flags); |
|
for (i = 0; i < conf->raid_disks; i++) { |
|
struct md_rdev *rdev = conf->mirrors[i].rdev; |
|
struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
|
if (repl |
|
&& !test_bit(Candidate, &repl->flags) |
|
&& repl->recovery_offset == MaxSector |
|
&& !test_bit(Faulty, &repl->flags) |
|
&& !test_and_set_bit(In_sync, &repl->flags)) { |
|
/* replacement has just become active */ |
|
if (!rdev || |
|
!test_and_clear_bit(In_sync, &rdev->flags)) |
|
count++; |
|
if (rdev) { |
|
/* Replaced device not technically |
|
* faulty, but we need to be sure |
|
* it gets removed and never re-added |
|
*/ |
|
set_bit(Faulty, &rdev->flags); |
|
sysfs_notify_dirent_safe( |
|
rdev->sysfs_state); |
|
} |
|
} |
|
if (rdev |
|
&& rdev->recovery_offset == MaxSector |
|
&& !test_bit(Faulty, &rdev->flags) |
|
&& !test_and_set_bit(In_sync, &rdev->flags)) { |
|
count++; |
|
sysfs_notify_dirent_safe(rdev->sysfs_state); |
|
} |
|
} |
|
mddev->degraded -= count; |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
|
|
print_conf(conf); |
|
return count; |
|
} |
|
|
|
static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
int err = -EEXIST; |
|
int mirror = 0; |
|
struct raid1_info *p; |
|
int first = 0; |
|
int last = conf->raid_disks - 1; |
|
|
|
if (mddev->recovery_disabled == conf->recovery_disabled) |
|
return -EBUSY; |
|
|
|
if (md_integrity_add_rdev(rdev, mddev)) |
|
return -ENXIO; |
|
|
|
if (rdev->raid_disk >= 0) |
|
first = last = rdev->raid_disk; |
|
|
|
/* |
|
* find the disk ... but prefer rdev->saved_raid_disk |
|
* if possible. |
|
*/ |
|
if (rdev->saved_raid_disk >= 0 && |
|
rdev->saved_raid_disk >= first && |
|
rdev->saved_raid_disk < conf->raid_disks && |
|
conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
|
first = last = rdev->saved_raid_disk; |
|
|
|
for (mirror = first; mirror <= last; mirror++) { |
|
p = conf->mirrors + mirror; |
|
if (!p->rdev) { |
|
if (mddev->gendisk) |
|
disk_stack_limits(mddev->gendisk, rdev->bdev, |
|
rdev->data_offset << 9); |
|
|
|
p->head_position = 0; |
|
rdev->raid_disk = mirror; |
|
err = 0; |
|
/* As all devices are equivalent, we don't need a full recovery |
|
* if this was recently any drive of the array |
|
*/ |
|
if (rdev->saved_raid_disk < 0) |
|
conf->fullsync = 1; |
|
rcu_assign_pointer(p->rdev, rdev); |
|
break; |
|
} |
|
if (test_bit(WantReplacement, &p->rdev->flags) && |
|
p[conf->raid_disks].rdev == NULL) { |
|
/* Add this device as a replacement */ |
|
clear_bit(In_sync, &rdev->flags); |
|
set_bit(Replacement, &rdev->flags); |
|
rdev->raid_disk = mirror; |
|
err = 0; |
|
conf->fullsync = 1; |
|
rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); |
|
break; |
|
} |
|
} |
|
if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
|
blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
|
print_conf(conf); |
|
return err; |
|
} |
|
|
|
static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
int err = 0; |
|
int number = rdev->raid_disk; |
|
struct raid1_info *p = conf->mirrors + number; |
|
|
|
if (rdev != p->rdev) |
|
p = conf->mirrors + conf->raid_disks + number; |
|
|
|
print_conf(conf); |
|
if (rdev == p->rdev) { |
|
if (test_bit(In_sync, &rdev->flags) || |
|
atomic_read(&rdev->nr_pending)) { |
|
err = -EBUSY; |
|
goto abort; |
|
} |
|
/* Only remove non-faulty devices if recovery |
|
* is not possible. |
|
*/ |
|
if (!test_bit(Faulty, &rdev->flags) && |
|
mddev->recovery_disabled != conf->recovery_disabled && |
|
mddev->degraded < conf->raid_disks) { |
|
err = -EBUSY; |
|
goto abort; |
|
} |
|
p->rdev = NULL; |
|
if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
|
synchronize_rcu(); |
|
if (atomic_read(&rdev->nr_pending)) { |
|
/* lost the race, try later */ |
|
err = -EBUSY; |
|
p->rdev = rdev; |
|
goto abort; |
|
} |
|
} |
|
if (conf->mirrors[conf->raid_disks + number].rdev) { |
|
/* We just removed a device that is being replaced. |
|
* Move down the replacement. We drain all IO before |
|
* doing this to avoid confusion. |
|
*/ |
|
struct md_rdev *repl = |
|
conf->mirrors[conf->raid_disks + number].rdev; |
|
freeze_array(conf, 0); |
|
if (atomic_read(&repl->nr_pending)) { |
|
/* It means that some queued IO of retry_list |
|
* hold repl. Thus, we cannot set replacement |
|
* as NULL, avoiding rdev NULL pointer |
|
* dereference in sync_request_write and |
|
* handle_write_finished. |
|
*/ |
|
err = -EBUSY; |
|
unfreeze_array(conf); |
|
goto abort; |
|
} |
|
clear_bit(Replacement, &repl->flags); |
|
p->rdev = repl; |
|
conf->mirrors[conf->raid_disks + number].rdev = NULL; |
|
unfreeze_array(conf); |
|
} |
|
|
|
clear_bit(WantReplacement, &rdev->flags); |
|
err = md_integrity_register(mddev); |
|
} |
|
abort: |
|
|
|
print_conf(conf); |
|
return err; |
|
} |
|
|
|
static void end_sync_read(struct bio *bio) |
|
{ |
|
struct r1bio *r1_bio = get_resync_r1bio(bio); |
|
|
|
update_head_pos(r1_bio->read_disk, r1_bio); |
|
|
|
/* |
|
* we have read a block, now it needs to be re-written, |
|
* or re-read if the read failed. |
|
* We don't do much here, just schedule handling by raid1d |
|
*/ |
|
if (!bio->bi_status) |
|
set_bit(R1BIO_Uptodate, &r1_bio->state); |
|
|
|
if (atomic_dec_and_test(&r1_bio->remaining)) |
|
reschedule_retry(r1_bio); |
|
} |
|
|
|
static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) |
|
{ |
|
sector_t sync_blocks = 0; |
|
sector_t s = r1_bio->sector; |
|
long sectors_to_go = r1_bio->sectors; |
|
|
|
/* make sure these bits don't get cleared. */ |
|
do { |
|
md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); |
|
s += sync_blocks; |
|
sectors_to_go -= sync_blocks; |
|
} while (sectors_to_go > 0); |
|
} |
|
|
|
static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate) |
|
{ |
|
if (atomic_dec_and_test(&r1_bio->remaining)) { |
|
struct mddev *mddev = r1_bio->mddev; |
|
int s = r1_bio->sectors; |
|
|
|
if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
|
test_bit(R1BIO_WriteError, &r1_bio->state)) |
|
reschedule_retry(r1_bio); |
|
else { |
|
put_buf(r1_bio); |
|
md_done_sync(mddev, s, uptodate); |
|
} |
|
} |
|
} |
|
|
|
static void end_sync_write(struct bio *bio) |
|
{ |
|
int uptodate = !bio->bi_status; |
|
struct r1bio *r1_bio = get_resync_r1bio(bio); |
|
struct mddev *mddev = r1_bio->mddev; |
|
struct r1conf *conf = mddev->private; |
|
sector_t first_bad; |
|
int bad_sectors; |
|
struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
|
|
|
if (!uptodate) { |
|
abort_sync_write(mddev, r1_bio); |
|
set_bit(WriteErrorSeen, &rdev->flags); |
|
if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
|
set_bit(MD_RECOVERY_NEEDED, & |
|
mddev->recovery); |
|
set_bit(R1BIO_WriteError, &r1_bio->state); |
|
} else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
|
&first_bad, &bad_sectors) && |
|
!is_badblock(conf->mirrors[r1_bio->read_disk].rdev, |
|
r1_bio->sector, |
|
r1_bio->sectors, |
|
&first_bad, &bad_sectors) |
|
) |
|
set_bit(R1BIO_MadeGood, &r1_bio->state); |
|
|
|
put_sync_write_buf(r1_bio, uptodate); |
|
} |
|
|
|
static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
|
int sectors, struct page *page, int rw) |
|
{ |
|
if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
|
/* success */ |
|
return 1; |
|
if (rw == WRITE) { |
|
set_bit(WriteErrorSeen, &rdev->flags); |
|
if (!test_and_set_bit(WantReplacement, |
|
&rdev->flags)) |
|
set_bit(MD_RECOVERY_NEEDED, & |
|
rdev->mddev->recovery); |
|
} |
|
/* need to record an error - either for the block or the device */ |
|
if (!rdev_set_badblocks(rdev, sector, sectors, 0)) |
|
md_error(rdev->mddev, rdev); |
|
return 0; |
|
} |
|
|
|
static int fix_sync_read_error(struct r1bio *r1_bio) |
|
{ |
|
/* Try some synchronous reads of other devices to get |
|
* good data, much like with normal read errors. Only |
|
* read into the pages we already have so we don't |
|
* need to re-issue the read request. |
|
* We don't need to freeze the array, because being in an |
|
* active sync request, there is no normal IO, and |
|
* no overlapping syncs. |
|
* We don't need to check is_badblock() again as we |
|
* made sure that anything with a bad block in range |
|
* will have bi_end_io clear. |
|
*/ |
|
struct mddev *mddev = r1_bio->mddev; |
|
struct r1conf *conf = mddev->private; |
|
struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
|
struct page **pages = get_resync_pages(bio)->pages; |
|
sector_t sect = r1_bio->sector; |
|
int sectors = r1_bio->sectors; |
|
int idx = 0; |
|
struct md_rdev *rdev; |
|
|
|
rdev = conf->mirrors[r1_bio->read_disk].rdev; |
|
if (test_bit(FailFast, &rdev->flags)) { |
|
/* Don't try recovering from here - just fail it |
|
* ... unless it is the last working device of course */ |
|
md_error(mddev, rdev); |
|
if (test_bit(Faulty, &rdev->flags)) |
|
/* Don't try to read from here, but make sure |
|
* put_buf does it's thing |
|
*/ |
|
bio->bi_end_io = end_sync_write; |
|
} |
|
|
|
while(sectors) { |
|
int s = sectors; |
|
int d = r1_bio->read_disk; |
|
int success = 0; |
|
int start; |
|
|
|
if (s > (PAGE_SIZE>>9)) |
|
s = PAGE_SIZE >> 9; |
|
do { |
|
if (r1_bio->bios[d]->bi_end_io == end_sync_read) { |
|
/* No rcu protection needed here devices |
|
* can only be removed when no resync is |
|
* active, and resync is currently active |
|
*/ |
|
rdev = conf->mirrors[d].rdev; |
|
if (sync_page_io(rdev, sect, s<<9, |
|
pages[idx], |
|
REQ_OP_READ, 0, false)) { |
|
success = 1; |
|
break; |
|
} |
|
} |
|
d++; |
|
if (d == conf->raid_disks * 2) |
|
d = 0; |
|
} while (!success && d != r1_bio->read_disk); |
|
|
|
if (!success) { |
|
char b[BDEVNAME_SIZE]; |
|
int abort = 0; |
|
/* Cannot read from anywhere, this block is lost. |
|
* Record a bad block on each device. If that doesn't |
|
* work just disable and interrupt the recovery. |
|
* Don't fail devices as that won't really help. |
|
*/ |
|
pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
|
mdname(mddev), bio_devname(bio, b), |
|
(unsigned long long)r1_bio->sector); |
|
for (d = 0; d < conf->raid_disks * 2; d++) { |
|
rdev = conf->mirrors[d].rdev; |
|
if (!rdev || test_bit(Faulty, &rdev->flags)) |
|
continue; |
|
if (!rdev_set_badblocks(rdev, sect, s, 0)) |
|
abort = 1; |
|
} |
|
if (abort) { |
|
conf->recovery_disabled = |
|
mddev->recovery_disabled; |
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
|
md_done_sync(mddev, r1_bio->sectors, 0); |
|
put_buf(r1_bio); |
|
return 0; |
|
} |
|
/* Try next page */ |
|
sectors -= s; |
|
sect += s; |
|
idx++; |
|
continue; |
|
} |
|
|
|
start = d; |
|
/* write it back and re-read */ |
|
while (d != r1_bio->read_disk) { |
|
if (d == 0) |
|
d = conf->raid_disks * 2; |
|
d--; |
|
if (r1_bio->bios[d]->bi_end_io != end_sync_read) |
|
continue; |
|
rdev = conf->mirrors[d].rdev; |
|
if (r1_sync_page_io(rdev, sect, s, |
|
pages[idx], |
|
WRITE) == 0) { |
|
r1_bio->bios[d]->bi_end_io = NULL; |
|
rdev_dec_pending(rdev, mddev); |
|
} |
|
} |
|
d = start; |
|
while (d != r1_bio->read_disk) { |
|
if (d == 0) |
|
d = conf->raid_disks * 2; |
|
d--; |
|
if (r1_bio->bios[d]->bi_end_io != end_sync_read) |
|
continue; |
|
rdev = conf->mirrors[d].rdev; |
|
if (r1_sync_page_io(rdev, sect, s, |
|
pages[idx], |
|
READ) != 0) |
|
atomic_add(s, &rdev->corrected_errors); |
|
} |
|
sectors -= s; |
|
sect += s; |
|
idx ++; |
|
} |
|
set_bit(R1BIO_Uptodate, &r1_bio->state); |
|
bio->bi_status = 0; |
|
return 1; |
|
} |
|
|
|
static void process_checks(struct r1bio *r1_bio) |
|
{ |
|
/* We have read all readable devices. If we haven't |
|
* got the block, then there is no hope left. |
|
* If we have, then we want to do a comparison |
|
* and skip the write if everything is the same. |
|
* If any blocks failed to read, then we need to |
|
* attempt an over-write |
|
*/ |
|
struct mddev *mddev = r1_bio->mddev; |
|
struct r1conf *conf = mddev->private; |
|
int primary; |
|
int i; |
|
int vcnt; |
|
|
|
/* Fix variable parts of all bios */ |
|
vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); |
|
for (i = 0; i < conf->raid_disks * 2; i++) { |
|
blk_status_t status; |
|
struct bio *b = r1_bio->bios[i]; |
|
struct resync_pages *rp = get_resync_pages(b); |
|
if (b->bi_end_io != end_sync_read) |
|
continue; |
|
/* fixup the bio for reuse, but preserve errno */ |
|
status = b->bi_status; |
|
bio_reset(b); |
|
b->bi_status = status; |
|
b->bi_iter.bi_sector = r1_bio->sector + |
|
conf->mirrors[i].rdev->data_offset; |
|
bio_set_dev(b, conf->mirrors[i].rdev->bdev); |
|
b->bi_end_io = end_sync_read; |
|
rp->raid_bio = r1_bio; |
|
b->bi_private = rp; |
|
|
|
/* initialize bvec table again */ |
|
md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); |
|
} |
|
for (primary = 0; primary < conf->raid_disks * 2; primary++) |
|
if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
|
!r1_bio->bios[primary]->bi_status) { |
|
r1_bio->bios[primary]->bi_end_io = NULL; |
|
rdev_dec_pending(conf->mirrors[primary].rdev, mddev); |
|
break; |
|
} |
|
r1_bio->read_disk = primary; |
|
for (i = 0; i < conf->raid_disks * 2; i++) { |
|
int j = 0; |
|
struct bio *pbio = r1_bio->bios[primary]; |
|
struct bio *sbio = r1_bio->bios[i]; |
|
blk_status_t status = sbio->bi_status; |
|
struct page **ppages = get_resync_pages(pbio)->pages; |
|
struct page **spages = get_resync_pages(sbio)->pages; |
|
struct bio_vec *bi; |
|
int page_len[RESYNC_PAGES] = { 0 }; |
|
struct bvec_iter_all iter_all; |
|
|
|
if (sbio->bi_end_io != end_sync_read) |
|
continue; |
|
/* Now we can 'fixup' the error value */ |
|
sbio->bi_status = 0; |
|
|
|
bio_for_each_segment_all(bi, sbio, iter_all) |
|
page_len[j++] = bi->bv_len; |
|
|
|
if (!status) { |
|
for (j = vcnt; j-- ; ) { |
|
if (memcmp(page_address(ppages[j]), |
|
page_address(spages[j]), |
|
page_len[j])) |
|
break; |
|
} |
|
} else |
|
j = 0; |
|
if (j >= 0) |
|
atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
|
if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
|
&& !status)) { |
|
/* No need to write to this device. */ |
|
sbio->bi_end_io = NULL; |
|
rdev_dec_pending(conf->mirrors[i].rdev, mddev); |
|
continue; |
|
} |
|
|
|
bio_copy_data(sbio, pbio); |
|
} |
|
} |
|
|
|
static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
int i; |
|
int disks = conf->raid_disks * 2; |
|
struct bio *wbio; |
|
|
|
if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
|
/* ouch - failed to read all of that. */ |
|
if (!fix_sync_read_error(r1_bio)) |
|
return; |
|
|
|
if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
|
process_checks(r1_bio); |
|
|
|
/* |
|
* schedule writes |
|
*/ |
|
atomic_set(&r1_bio->remaining, 1); |
|
for (i = 0; i < disks ; i++) { |
|
wbio = r1_bio->bios[i]; |
|
if (wbio->bi_end_io == NULL || |
|
(wbio->bi_end_io == end_sync_read && |
|
(i == r1_bio->read_disk || |
|
!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) |
|
continue; |
|
if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { |
|
abort_sync_write(mddev, r1_bio); |
|
continue; |
|
} |
|
|
|
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
|
if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
|
wbio->bi_opf |= MD_FAILFAST; |
|
|
|
wbio->bi_end_io = end_sync_write; |
|
atomic_inc(&r1_bio->remaining); |
|
md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
|
|
|
submit_bio_noacct(wbio); |
|
} |
|
|
|
put_sync_write_buf(r1_bio, 1); |
|
} |
|
|
|
/* |
|
* This is a kernel thread which: |
|
* |
|
* 1. Retries failed read operations on working mirrors. |
|
* 2. Updates the raid superblock when problems encounter. |
|
* 3. Performs writes following reads for array synchronising. |
|
*/ |
|
|
|
static void fix_read_error(struct r1conf *conf, int read_disk, |
|
sector_t sect, int sectors) |
|
{ |
|
struct mddev *mddev = conf->mddev; |
|
while(sectors) { |
|
int s = sectors; |
|
int d = read_disk; |
|
int success = 0; |
|
int start; |
|
struct md_rdev *rdev; |
|
|
|
if (s > (PAGE_SIZE>>9)) |
|
s = PAGE_SIZE >> 9; |
|
|
|
do { |
|
sector_t first_bad; |
|
int bad_sectors; |
|
|
|
rcu_read_lock(); |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (rdev && |
|
(test_bit(In_sync, &rdev->flags) || |
|
(!test_bit(Faulty, &rdev->flags) && |
|
rdev->recovery_offset >= sect + s)) && |
|
is_badblock(rdev, sect, s, |
|
&first_bad, &bad_sectors) == 0) { |
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
if (sync_page_io(rdev, sect, s<<9, |
|
conf->tmppage, REQ_OP_READ, 0, false)) |
|
success = 1; |
|
rdev_dec_pending(rdev, mddev); |
|
if (success) |
|
break; |
|
} else |
|
rcu_read_unlock(); |
|
d++; |
|
if (d == conf->raid_disks * 2) |
|
d = 0; |
|
} while (!success && d != read_disk); |
|
|
|
if (!success) { |
|
/* Cannot read from anywhere - mark it bad */ |
|
struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
|
if (!rdev_set_badblocks(rdev, sect, s, 0)) |
|
md_error(mddev, rdev); |
|
break; |
|
} |
|
/* write it back and re-read */ |
|
start = d; |
|
while (d != read_disk) { |
|
if (d==0) |
|
d = conf->raid_disks * 2; |
|
d--; |
|
rcu_read_lock(); |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (rdev && |
|
!test_bit(Faulty, &rdev->flags)) { |
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
r1_sync_page_io(rdev, sect, s, |
|
conf->tmppage, WRITE); |
|
rdev_dec_pending(rdev, mddev); |
|
} else |
|
rcu_read_unlock(); |
|
} |
|
d = start; |
|
while (d != read_disk) { |
|
char b[BDEVNAME_SIZE]; |
|
if (d==0) |
|
d = conf->raid_disks * 2; |
|
d--; |
|
rcu_read_lock(); |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (rdev && |
|
!test_bit(Faulty, &rdev->flags)) { |
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
if (r1_sync_page_io(rdev, sect, s, |
|
conf->tmppage, READ)) { |
|
atomic_add(s, &rdev->corrected_errors); |
|
pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", |
|
mdname(mddev), s, |
|
(unsigned long long)(sect + |
|
rdev->data_offset), |
|
bdevname(rdev->bdev, b)); |
|
} |
|
rdev_dec_pending(rdev, mddev); |
|
} else |
|
rcu_read_unlock(); |
|
} |
|
sectors -= s; |
|
sect += s; |
|
} |
|
} |
|
|
|
static int narrow_write_error(struct r1bio *r1_bio, int i) |
|
{ |
|
struct mddev *mddev = r1_bio->mddev; |
|
struct r1conf *conf = mddev->private; |
|
struct md_rdev *rdev = conf->mirrors[i].rdev; |
|
|
|
/* bio has the data to be written to device 'i' where |
|
* we just recently had a write error. |
|
* We repeatedly clone the bio and trim down to one block, |
|
* then try the write. Where the write fails we record |
|
* a bad block. |
|
* It is conceivable that the bio doesn't exactly align with |
|
* blocks. We must handle this somehow. |
|
* |
|
* We currently own a reference on the rdev. |
|
*/ |
|
|
|
int block_sectors; |
|
sector_t sector; |
|
int sectors; |
|
int sect_to_write = r1_bio->sectors; |
|
int ok = 1; |
|
|
|
if (rdev->badblocks.shift < 0) |
|
return 0; |
|
|
|
block_sectors = roundup(1 << rdev->badblocks.shift, |
|
bdev_logical_block_size(rdev->bdev) >> 9); |
|
sector = r1_bio->sector; |
|
sectors = ((sector + block_sectors) |
|
& ~(sector_t)(block_sectors - 1)) |
|
- sector; |
|
|
|
while (sect_to_write) { |
|
struct bio *wbio; |
|
if (sectors > sect_to_write) |
|
sectors = sect_to_write; |
|
/* Write at 'sector' for 'sectors'*/ |
|
|
|
if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
|
wbio = bio_clone_fast(r1_bio->behind_master_bio, |
|
GFP_NOIO, |
|
&mddev->bio_set); |
|
} else { |
|
wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, |
|
&mddev->bio_set); |
|
} |
|
|
|
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
|
wbio->bi_iter.bi_sector = r1_bio->sector; |
|
wbio->bi_iter.bi_size = r1_bio->sectors << 9; |
|
|
|
bio_trim(wbio, sector - r1_bio->sector, sectors); |
|
wbio->bi_iter.bi_sector += rdev->data_offset; |
|
bio_set_dev(wbio, rdev->bdev); |
|
|
|
if (submit_bio_wait(wbio) < 0) |
|
/* failure! */ |
|
ok = rdev_set_badblocks(rdev, sector, |
|
sectors, 0) |
|
&& ok; |
|
|
|
bio_put(wbio); |
|
sect_to_write -= sectors; |
|
sector += sectors; |
|
sectors = block_sectors; |
|
} |
|
return ok; |
|
} |
|
|
|
static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
|
{ |
|
int m; |
|
int s = r1_bio->sectors; |
|
for (m = 0; m < conf->raid_disks * 2 ; m++) { |
|
struct md_rdev *rdev = conf->mirrors[m].rdev; |
|
struct bio *bio = r1_bio->bios[m]; |
|
if (bio->bi_end_io == NULL) |
|
continue; |
|
if (!bio->bi_status && |
|
test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
|
rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
|
} |
|
if (bio->bi_status && |
|
test_bit(R1BIO_WriteError, &r1_bio->state)) { |
|
if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) |
|
md_error(conf->mddev, rdev); |
|
} |
|
} |
|
put_buf(r1_bio); |
|
md_done_sync(conf->mddev, s, 1); |
|
} |
|
|
|
static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
|
{ |
|
int m, idx; |
|
bool fail = false; |
|
|
|
for (m = 0; m < conf->raid_disks * 2 ; m++) |
|
if (r1_bio->bios[m] == IO_MADE_GOOD) { |
|
struct md_rdev *rdev = conf->mirrors[m].rdev; |
|
rdev_clear_badblocks(rdev, |
|
r1_bio->sector, |
|
r1_bio->sectors, 0); |
|
rdev_dec_pending(rdev, conf->mddev); |
|
} else if (r1_bio->bios[m] != NULL) { |
|
/* This drive got a write error. We need to |
|
* narrow down and record precise write |
|
* errors. |
|
*/ |
|
fail = true; |
|
if (!narrow_write_error(r1_bio, m)) { |
|
md_error(conf->mddev, |
|
conf->mirrors[m].rdev); |
|
/* an I/O failed, we can't clear the bitmap */ |
|
set_bit(R1BIO_Degraded, &r1_bio->state); |
|
} |
|
rdev_dec_pending(conf->mirrors[m].rdev, |
|
conf->mddev); |
|
} |
|
if (fail) { |
|
spin_lock_irq(&conf->device_lock); |
|
list_add(&r1_bio->retry_list, &conf->bio_end_io_list); |
|
idx = sector_to_idx(r1_bio->sector); |
|
atomic_inc(&conf->nr_queued[idx]); |
|
spin_unlock_irq(&conf->device_lock); |
|
/* |
|
* In case freeze_array() is waiting for condition |
|
* get_unqueued_pending() == extra to be true. |
|
*/ |
|
wake_up(&conf->wait_barrier); |
|
md_wakeup_thread(conf->mddev->thread); |
|
} else { |
|
if (test_bit(R1BIO_WriteError, &r1_bio->state)) |
|
close_write(r1_bio); |
|
raid_end_bio_io(r1_bio); |
|
} |
|
} |
|
|
|
static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
|
{ |
|
struct mddev *mddev = conf->mddev; |
|
struct bio *bio; |
|
struct md_rdev *rdev; |
|
|
|
clear_bit(R1BIO_ReadError, &r1_bio->state); |
|
/* we got a read error. Maybe the drive is bad. Maybe just |
|
* the block and we can fix it. |
|
* We freeze all other IO, and try reading the block from |
|
* other devices. When we find one, we re-write |
|
* and check it that fixes the read error. |
|
* This is all done synchronously while the array is |
|
* frozen |
|
*/ |
|
|
|
bio = r1_bio->bios[r1_bio->read_disk]; |
|
bio_put(bio); |
|
r1_bio->bios[r1_bio->read_disk] = NULL; |
|
|
|
rdev = conf->mirrors[r1_bio->read_disk].rdev; |
|
if (mddev->ro == 0 |
|
&& !test_bit(FailFast, &rdev->flags)) { |
|
freeze_array(conf, 1); |
|
fix_read_error(conf, r1_bio->read_disk, |
|
r1_bio->sector, r1_bio->sectors); |
|
unfreeze_array(conf); |
|
} else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { |
|
md_error(mddev, rdev); |
|
} else { |
|
r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; |
|
} |
|
|
|
rdev_dec_pending(rdev, conf->mddev); |
|
allow_barrier(conf, r1_bio->sector); |
|
bio = r1_bio->master_bio; |
|
|
|
/* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ |
|
r1_bio->state = 0; |
|
raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); |
|
} |
|
|
|
static void raid1d(struct md_thread *thread) |
|
{ |
|
struct mddev *mddev = thread->mddev; |
|
struct r1bio *r1_bio; |
|
unsigned long flags; |
|
struct r1conf *conf = mddev->private; |
|
struct list_head *head = &conf->retry_list; |
|
struct blk_plug plug; |
|
int idx; |
|
|
|
md_check_recovery(mddev); |
|
|
|
if (!list_empty_careful(&conf->bio_end_io_list) && |
|
!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
|
LIST_HEAD(tmp); |
|
spin_lock_irqsave(&conf->device_lock, flags); |
|
if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
|
list_splice_init(&conf->bio_end_io_list, &tmp); |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
while (!list_empty(&tmp)) { |
|
r1_bio = list_first_entry(&tmp, struct r1bio, |
|
retry_list); |
|
list_del(&r1_bio->retry_list); |
|
idx = sector_to_idx(r1_bio->sector); |
|
atomic_dec(&conf->nr_queued[idx]); |
|
if (mddev->degraded) |
|
set_bit(R1BIO_Degraded, &r1_bio->state); |
|
if (test_bit(R1BIO_WriteError, &r1_bio->state)) |
|
close_write(r1_bio); |
|
raid_end_bio_io(r1_bio); |
|
} |
|
} |
|
|
|
blk_start_plug(&plug); |
|
for (;;) { |
|
|
|
flush_pending_writes(conf); |
|
|
|
spin_lock_irqsave(&conf->device_lock, flags); |
|
if (list_empty(head)) { |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
break; |
|
} |
|
r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
|
list_del(head->prev); |
|
idx = sector_to_idx(r1_bio->sector); |
|
atomic_dec(&conf->nr_queued[idx]); |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
|
|
mddev = r1_bio->mddev; |
|
conf = mddev->private; |
|
if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
|
if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
|
test_bit(R1BIO_WriteError, &r1_bio->state)) |
|
handle_sync_write_finished(conf, r1_bio); |
|
else |
|
sync_request_write(mddev, r1_bio); |
|
} else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
|
test_bit(R1BIO_WriteError, &r1_bio->state)) |
|
handle_write_finished(conf, r1_bio); |
|
else if (test_bit(R1BIO_ReadError, &r1_bio->state)) |
|
handle_read_error(conf, r1_bio); |
|
else |
|
WARN_ON_ONCE(1); |
|
|
|
cond_resched(); |
|
if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
|
md_check_recovery(mddev); |
|
} |
|
blk_finish_plug(&plug); |
|
} |
|
|
|
static int init_resync(struct r1conf *conf) |
|
{ |
|
int buffs; |
|
|
|
buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; |
|
BUG_ON(mempool_initialized(&conf->r1buf_pool)); |
|
|
|
return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, |
|
r1buf_pool_free, conf->poolinfo); |
|
} |
|
|
|
static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) |
|
{ |
|
struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); |
|
struct resync_pages *rps; |
|
struct bio *bio; |
|
int i; |
|
|
|
for (i = conf->poolinfo->raid_disks; i--; ) { |
|
bio = r1bio->bios[i]; |
|
rps = bio->bi_private; |
|
bio_reset(bio); |
|
bio->bi_private = rps; |
|
} |
|
r1bio->master_bio = NULL; |
|
return r1bio; |
|
} |
|
|
|
/* |
|
* perform a "sync" on one "block" |
|
* |
|
* We need to make sure that no normal I/O request - particularly write |
|
* requests - conflict with active sync requests. |
|
* |
|
* This is achieved by tracking pending requests and a 'barrier' concept |
|
* that can be installed to exclude normal IO requests. |
|
*/ |
|
|
|
static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
|
int *skipped) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
struct r1bio *r1_bio; |
|
struct bio *bio; |
|
sector_t max_sector, nr_sectors; |
|
int disk = -1; |
|
int i; |
|
int wonly = -1; |
|
int write_targets = 0, read_targets = 0; |
|
sector_t sync_blocks; |
|
int still_degraded = 0; |
|
int good_sectors = RESYNC_SECTORS; |
|
int min_bad = 0; /* number of sectors that are bad in all devices */ |
|
int idx = sector_to_idx(sector_nr); |
|
int page_idx = 0; |
|
|
|
if (!mempool_initialized(&conf->r1buf_pool)) |
|
if (init_resync(conf)) |
|
return 0; |
|
|
|
max_sector = mddev->dev_sectors; |
|
if (sector_nr >= max_sector) { |
|
/* If we aborted, we need to abort the |
|
* sync on the 'current' bitmap chunk (there will |
|
* only be one in raid1 resync. |
|
* We can find the current addess in mddev->curr_resync |
|
*/ |
|
if (mddev->curr_resync < max_sector) /* aborted */ |
|
md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
|
&sync_blocks, 1); |
|
else /* completed sync */ |
|
conf->fullsync = 0; |
|
|
|
md_bitmap_close_sync(mddev->bitmap); |
|
close_sync(conf); |
|
|
|
if (mddev_is_clustered(mddev)) { |
|
conf->cluster_sync_low = 0; |
|
conf->cluster_sync_high = 0; |
|
} |
|
return 0; |
|
} |
|
|
|
if (mddev->bitmap == NULL && |
|
mddev->recovery_cp == MaxSector && |
|
!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
|
conf->fullsync == 0) { |
|
*skipped = 1; |
|
return max_sector - sector_nr; |
|
} |
|
/* before building a request, check if we can skip these blocks.. |
|
* This call the bitmap_start_sync doesn't actually record anything |
|
*/ |
|
if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
|
!conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
|
/* We can skip this block, and probably several more */ |
|
*skipped = 1; |
|
return sync_blocks; |
|
} |
|
|
|
/* |
|
* If there is non-resync activity waiting for a turn, then let it |
|
* though before starting on this new sync request. |
|
*/ |
|
if (atomic_read(&conf->nr_waiting[idx])) |
|
schedule_timeout_uninterruptible(1); |
|
|
|
/* we are incrementing sector_nr below. To be safe, we check against |
|
* sector_nr + two times RESYNC_SECTORS |
|
*/ |
|
|
|
md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, |
|
mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); |
|
|
|
|
|
if (raise_barrier(conf, sector_nr)) |
|
return 0; |
|
|
|
r1_bio = raid1_alloc_init_r1buf(conf); |
|
|
|
rcu_read_lock(); |
|
/* |
|
* If we get a correctably read error during resync or recovery, |
|
* we might want to read from a different device. So we |
|
* flag all drives that could conceivably be read from for READ, |
|
* and any others (which will be non-In_sync devices) for WRITE. |
|
* If a read fails, we try reading from something else for which READ |
|
* is OK. |
|
*/ |
|
|
|
r1_bio->mddev = mddev; |
|
r1_bio->sector = sector_nr; |
|
r1_bio->state = 0; |
|
set_bit(R1BIO_IsSync, &r1_bio->state); |
|
/* make sure good_sectors won't go across barrier unit boundary */ |
|
good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); |
|
|
|
for (i = 0; i < conf->raid_disks * 2; i++) { |
|
struct md_rdev *rdev; |
|
bio = r1_bio->bios[i]; |
|
|
|
rdev = rcu_dereference(conf->mirrors[i].rdev); |
|
if (rdev == NULL || |
|
test_bit(Faulty, &rdev->flags)) { |
|
if (i < conf->raid_disks) |
|
still_degraded = 1; |
|
} else if (!test_bit(In_sync, &rdev->flags)) { |
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
|
bio->bi_end_io = end_sync_write; |
|
write_targets ++; |
|
} else { |
|
/* may need to read from here */ |
|
sector_t first_bad = MaxSector; |
|
int bad_sectors; |
|
|
|
if (is_badblock(rdev, sector_nr, good_sectors, |
|
&first_bad, &bad_sectors)) { |
|
if (first_bad > sector_nr) |
|
good_sectors = first_bad - sector_nr; |
|
else { |
|
bad_sectors -= (sector_nr - first_bad); |
|
if (min_bad == 0 || |
|
min_bad > bad_sectors) |
|
min_bad = bad_sectors; |
|
} |
|
} |
|
if (sector_nr < first_bad) { |
|
if (test_bit(WriteMostly, &rdev->flags)) { |
|
if (wonly < 0) |
|
wonly = i; |
|
} else { |
|
if (disk < 0) |
|
disk = i; |
|
} |
|
bio_set_op_attrs(bio, REQ_OP_READ, 0); |
|
bio->bi_end_io = end_sync_read; |
|
read_targets++; |
|
} else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
|
test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
|
!test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
|
/* |
|
* The device is suitable for reading (InSync), |
|
* but has bad block(s) here. Let's try to correct them, |
|
* if we are doing resync or repair. Otherwise, leave |
|
* this device alone for this sync request. |
|
*/ |
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
|
bio->bi_end_io = end_sync_write; |
|
write_targets++; |
|
} |
|
} |
|
if (rdev && bio->bi_end_io) { |
|
atomic_inc(&rdev->nr_pending); |
|
bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
|
bio_set_dev(bio, rdev->bdev); |
|
if (test_bit(FailFast, &rdev->flags)) |
|
bio->bi_opf |= MD_FAILFAST; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
if (disk < 0) |
|
disk = wonly; |
|
r1_bio->read_disk = disk; |
|
|
|
if (read_targets == 0 && min_bad > 0) { |
|
/* These sectors are bad on all InSync devices, so we |
|
* need to mark them bad on all write targets |
|
*/ |
|
int ok = 1; |
|
for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
|
if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
|
struct md_rdev *rdev = conf->mirrors[i].rdev; |
|
ok = rdev_set_badblocks(rdev, sector_nr, |
|
min_bad, 0 |
|
) && ok; |
|
} |
|
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
|
*skipped = 1; |
|
put_buf(r1_bio); |
|
|
|
if (!ok) { |
|
/* Cannot record the badblocks, so need to |
|
* abort the resync. |
|
* If there are multiple read targets, could just |
|
* fail the really bad ones ??? |
|
*/ |
|
conf->recovery_disabled = mddev->recovery_disabled; |
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
|
return 0; |
|
} else |
|
return min_bad; |
|
|
|
} |
|
if (min_bad > 0 && min_bad < good_sectors) { |
|
/* only resync enough to reach the next bad->good |
|
* transition */ |
|
good_sectors = min_bad; |
|
} |
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
|
/* extra read targets are also write targets */ |
|
write_targets += read_targets-1; |
|
|
|
if (write_targets == 0 || read_targets == 0) { |
|
/* There is nowhere to write, so all non-sync |
|
* drives must be failed - so we are finished |
|
*/ |
|
sector_t rv; |
|
if (min_bad > 0) |
|
max_sector = sector_nr + min_bad; |
|
rv = max_sector - sector_nr; |
|
*skipped = 1; |
|
put_buf(r1_bio); |
|
return rv; |
|
} |
|
|
|
if (max_sector > mddev->resync_max) |
|
max_sector = mddev->resync_max; /* Don't do IO beyond here */ |
|
if (max_sector > sector_nr + good_sectors) |
|
max_sector = sector_nr + good_sectors; |
|
nr_sectors = 0; |
|
sync_blocks = 0; |
|
do { |
|
struct page *page; |
|
int len = PAGE_SIZE; |
|
if (sector_nr + (len>>9) > max_sector) |
|
len = (max_sector - sector_nr) << 9; |
|
if (len == 0) |
|
break; |
|
if (sync_blocks == 0) { |
|
if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, |
|
&sync_blocks, still_degraded) && |
|
!conf->fullsync && |
|
!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
|
break; |
|
if ((len >> 9) > sync_blocks) |
|
len = sync_blocks<<9; |
|
} |
|
|
|
for (i = 0 ; i < conf->raid_disks * 2; i++) { |
|
struct resync_pages *rp; |
|
|
|
bio = r1_bio->bios[i]; |
|
rp = get_resync_pages(bio); |
|
if (bio->bi_end_io) { |
|
page = resync_fetch_page(rp, page_idx); |
|
|
|
/* |
|
* won't fail because the vec table is big |
|
* enough to hold all these pages |
|
*/ |
|
bio_add_page(bio, page, len, 0); |
|
} |
|
} |
|
nr_sectors += len>>9; |
|
sector_nr += len>>9; |
|
sync_blocks -= (len>>9); |
|
} while (++page_idx < RESYNC_PAGES); |
|
|
|
r1_bio->sectors = nr_sectors; |
|
|
|
if (mddev_is_clustered(mddev) && |
|
conf->cluster_sync_high < sector_nr + nr_sectors) { |
|
conf->cluster_sync_low = mddev->curr_resync_completed; |
|
conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; |
|
/* Send resync message */ |
|
md_cluster_ops->resync_info_update(mddev, |
|
conf->cluster_sync_low, |
|
conf->cluster_sync_high); |
|
} |
|
|
|
/* For a user-requested sync, we read all readable devices and do a |
|
* compare |
|
*/ |
|
if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
|
atomic_set(&r1_bio->remaining, read_targets); |
|
for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
|
bio = r1_bio->bios[i]; |
|
if (bio->bi_end_io == end_sync_read) { |
|
read_targets--; |
|
md_sync_acct_bio(bio, nr_sectors); |
|
if (read_targets == 1) |
|
bio->bi_opf &= ~MD_FAILFAST; |
|
submit_bio_noacct(bio); |
|
} |
|
} |
|
} else { |
|
atomic_set(&r1_bio->remaining, 1); |
|
bio = r1_bio->bios[r1_bio->read_disk]; |
|
md_sync_acct_bio(bio, nr_sectors); |
|
if (read_targets == 1) |
|
bio->bi_opf &= ~MD_FAILFAST; |
|
submit_bio_noacct(bio); |
|
} |
|
return nr_sectors; |
|
} |
|
|
|
static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
|
{ |
|
if (sectors) |
|
return sectors; |
|
|
|
return mddev->dev_sectors; |
|
} |
|
|
|
static struct r1conf *setup_conf(struct mddev *mddev) |
|
{ |
|
struct r1conf *conf; |
|
int i; |
|
struct raid1_info *disk; |
|
struct md_rdev *rdev; |
|
int err = -ENOMEM; |
|
|
|
conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
|
if (!conf) |
|
goto abort; |
|
|
|
conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
|
sizeof(atomic_t), GFP_KERNEL); |
|
if (!conf->nr_pending) |
|
goto abort; |
|
|
|
conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, |
|
sizeof(atomic_t), GFP_KERNEL); |
|
if (!conf->nr_waiting) |
|
goto abort; |
|
|
|
conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, |
|
sizeof(atomic_t), GFP_KERNEL); |
|
if (!conf->nr_queued) |
|
goto abort; |
|
|
|
conf->barrier = kcalloc(BARRIER_BUCKETS_NR, |
|
sizeof(atomic_t), GFP_KERNEL); |
|
if (!conf->barrier) |
|
goto abort; |
|
|
|
conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
|
mddev->raid_disks, 2), |
|
GFP_KERNEL); |
|
if (!conf->mirrors) |
|
goto abort; |
|
|
|
conf->tmppage = alloc_page(GFP_KERNEL); |
|
if (!conf->tmppage) |
|
goto abort; |
|
|
|
conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
|
if (!conf->poolinfo) |
|
goto abort; |
|
conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
|
err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, |
|
rbio_pool_free, conf->poolinfo); |
|
if (err) |
|
goto abort; |
|
|
|
err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
|
if (err) |
|
goto abort; |
|
|
|
conf->poolinfo->mddev = mddev; |
|
|
|
err = -EINVAL; |
|
spin_lock_init(&conf->device_lock); |
|
rdev_for_each(rdev, mddev) { |
|
int disk_idx = rdev->raid_disk; |
|
if (disk_idx >= mddev->raid_disks |
|
|| disk_idx < 0) |
|
continue; |
|
if (test_bit(Replacement, &rdev->flags)) |
|
disk = conf->mirrors + mddev->raid_disks + disk_idx; |
|
else |
|
disk = conf->mirrors + disk_idx; |
|
|
|
if (disk->rdev) |
|
goto abort; |
|
disk->rdev = rdev; |
|
disk->head_position = 0; |
|
disk->seq_start = MaxSector; |
|
} |
|
conf->raid_disks = mddev->raid_disks; |
|
conf->mddev = mddev; |
|
INIT_LIST_HEAD(&conf->retry_list); |
|
INIT_LIST_HEAD(&conf->bio_end_io_list); |
|
|
|
spin_lock_init(&conf->resync_lock); |
|
init_waitqueue_head(&conf->wait_barrier); |
|
|
|
bio_list_init(&conf->pending_bio_list); |
|
conf->pending_count = 0; |
|
conf->recovery_disabled = mddev->recovery_disabled - 1; |
|
|
|
err = -EIO; |
|
for (i = 0; i < conf->raid_disks * 2; i++) { |
|
|
|
disk = conf->mirrors + i; |
|
|
|
if (i < conf->raid_disks && |
|
disk[conf->raid_disks].rdev) { |
|
/* This slot has a replacement. */ |
|
if (!disk->rdev) { |
|
/* No original, just make the replacement |
|
* a recovering spare |
|
*/ |
|
disk->rdev = |
|
disk[conf->raid_disks].rdev; |
|
disk[conf->raid_disks].rdev = NULL; |
|
} else if (!test_bit(In_sync, &disk->rdev->flags)) |
|
/* Original is not in_sync - bad */ |
|
goto abort; |
|
} |
|
|
|
if (!disk->rdev || |
|
!test_bit(In_sync, &disk->rdev->flags)) { |
|
disk->head_position = 0; |
|
if (disk->rdev && |
|
(disk->rdev->saved_raid_disk < 0)) |
|
conf->fullsync = 1; |
|
} |
|
} |
|
|
|
err = -ENOMEM; |
|
conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
|
if (!conf->thread) |
|
goto abort; |
|
|
|
return conf; |
|
|
|
abort: |
|
if (conf) { |
|
mempool_exit(&conf->r1bio_pool); |
|
kfree(conf->mirrors); |
|
safe_put_page(conf->tmppage); |
|
kfree(conf->poolinfo); |
|
kfree(conf->nr_pending); |
|
kfree(conf->nr_waiting); |
|
kfree(conf->nr_queued); |
|
kfree(conf->barrier); |
|
bioset_exit(&conf->bio_split); |
|
kfree(conf); |
|
} |
|
return ERR_PTR(err); |
|
} |
|
|
|
static void raid1_free(struct mddev *mddev, void *priv); |
|
static int raid1_run(struct mddev *mddev) |
|
{ |
|
struct r1conf *conf; |
|
int i; |
|
struct md_rdev *rdev; |
|
int ret; |
|
bool discard_supported = false; |
|
|
|
if (mddev->level != 1) { |
|
pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
|
mdname(mddev), mddev->level); |
|
return -EIO; |
|
} |
|
if (mddev->reshape_position != MaxSector) { |
|
pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
|
mdname(mddev)); |
|
return -EIO; |
|
} |
|
if (mddev_init_writes_pending(mddev) < 0) |
|
return -ENOMEM; |
|
/* |
|
* copy the already verified devices into our private RAID1 |
|
* bookkeeping area. [whatever we allocate in run(), |
|
* should be freed in raid1_free()] |
|
*/ |
|
if (mddev->private == NULL) |
|
conf = setup_conf(mddev); |
|
else |
|
conf = mddev->private; |
|
|
|
if (IS_ERR(conf)) |
|
return PTR_ERR(conf); |
|
|
|
if (mddev->queue) { |
|
blk_queue_max_write_same_sectors(mddev->queue, 0); |
|
blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
|
} |
|
|
|
rdev_for_each(rdev, mddev) { |
|
if (!mddev->gendisk) |
|
continue; |
|
disk_stack_limits(mddev->gendisk, rdev->bdev, |
|
rdev->data_offset << 9); |
|
if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
|
discard_supported = true; |
|
} |
|
|
|
mddev->degraded = 0; |
|
for (i = 0; i < conf->raid_disks; i++) |
|
if (conf->mirrors[i].rdev == NULL || |
|
!test_bit(In_sync, &conf->mirrors[i].rdev->flags) || |
|
test_bit(Faulty, &conf->mirrors[i].rdev->flags)) |
|
mddev->degraded++; |
|
/* |
|
* RAID1 needs at least one disk in active |
|
*/ |
|
if (conf->raid_disks - mddev->degraded < 1) { |
|
ret = -EINVAL; |
|
goto abort; |
|
} |
|
|
|
if (conf->raid_disks - mddev->degraded == 1) |
|
mddev->recovery_cp = MaxSector; |
|
|
|
if (mddev->recovery_cp != MaxSector) |
|
pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
|
mdname(mddev)); |
|
pr_info("md/raid1:%s: active with %d out of %d mirrors\n", |
|
mdname(mddev), mddev->raid_disks - mddev->degraded, |
|
mddev->raid_disks); |
|
|
|
/* |
|
* Ok, everything is just fine now |
|
*/ |
|
mddev->thread = conf->thread; |
|
conf->thread = NULL; |
|
mddev->private = conf; |
|
set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
|
|
|
md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
|
|
|
if (mddev->queue) { |
|
if (discard_supported) |
|
blk_queue_flag_set(QUEUE_FLAG_DISCARD, |
|
mddev->queue); |
|
else |
|
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, |
|
mddev->queue); |
|
} |
|
|
|
ret = md_integrity_register(mddev); |
|
if (ret) { |
|
md_unregister_thread(&mddev->thread); |
|
goto abort; |
|
} |
|
return 0; |
|
|
|
abort: |
|
raid1_free(mddev, conf); |
|
return ret; |
|
} |
|
|
|
static void raid1_free(struct mddev *mddev, void *priv) |
|
{ |
|
struct r1conf *conf = priv; |
|
|
|
mempool_exit(&conf->r1bio_pool); |
|
kfree(conf->mirrors); |
|
safe_put_page(conf->tmppage); |
|
kfree(conf->poolinfo); |
|
kfree(conf->nr_pending); |
|
kfree(conf->nr_waiting); |
|
kfree(conf->nr_queued); |
|
kfree(conf->barrier); |
|
bioset_exit(&conf->bio_split); |
|
kfree(conf); |
|
} |
|
|
|
static int raid1_resize(struct mddev *mddev, sector_t sectors) |
|
{ |
|
/* no resync is happening, and there is enough space |
|
* on all devices, so we can resize. |
|
* We need to make sure resync covers any new space. |
|
* If the array is shrinking we should possibly wait until |
|
* any io in the removed space completes, but it hardly seems |
|
* worth it. |
|
*/ |
|
sector_t newsize = raid1_size(mddev, sectors, 0); |
|
if (mddev->external_size && |
|
mddev->array_sectors > newsize) |
|
return -EINVAL; |
|
if (mddev->bitmap) { |
|
int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); |
|
if (ret) |
|
return ret; |
|
} |
|
md_set_array_sectors(mddev, newsize); |
|
if (sectors > mddev->dev_sectors && |
|
mddev->recovery_cp > mddev->dev_sectors) { |
|
mddev->recovery_cp = mddev->dev_sectors; |
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
|
} |
|
mddev->dev_sectors = sectors; |
|
mddev->resync_max_sectors = sectors; |
|
return 0; |
|
} |
|
|
|
static int raid1_reshape(struct mddev *mddev) |
|
{ |
|
/* We need to: |
|
* 1/ resize the r1bio_pool |
|
* 2/ resize conf->mirrors |
|
* |
|
* We allocate a new r1bio_pool if we can. |
|
* Then raise a device barrier and wait until all IO stops. |
|
* Then resize conf->mirrors and swap in the new r1bio pool. |
|
* |
|
* At the same time, we "pack" the devices so that all the missing |
|
* devices have the higher raid_disk numbers. |
|
*/ |
|
mempool_t newpool, oldpool; |
|
struct pool_info *newpoolinfo; |
|
struct raid1_info *newmirrors; |
|
struct r1conf *conf = mddev->private; |
|
int cnt, raid_disks; |
|
unsigned long flags; |
|
int d, d2; |
|
int ret; |
|
|
|
memset(&newpool, 0, sizeof(newpool)); |
|
memset(&oldpool, 0, sizeof(oldpool)); |
|
|
|
/* Cannot change chunk_size, layout, or level */ |
|
if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
|
mddev->layout != mddev->new_layout || |
|
mddev->level != mddev->new_level) { |
|
mddev->new_chunk_sectors = mddev->chunk_sectors; |
|
mddev->new_layout = mddev->layout; |
|
mddev->new_level = mddev->level; |
|
return -EINVAL; |
|
} |
|
|
|
if (!mddev_is_clustered(mddev)) |
|
md_allow_write(mddev); |
|
|
|
raid_disks = mddev->raid_disks + mddev->delta_disks; |
|
|
|
if (raid_disks < conf->raid_disks) { |
|
cnt=0; |
|
for (d= 0; d < conf->raid_disks; d++) |
|
if (conf->mirrors[d].rdev) |
|
cnt++; |
|
if (cnt > raid_disks) |
|
return -EBUSY; |
|
} |
|
|
|
newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); |
|
if (!newpoolinfo) |
|
return -ENOMEM; |
|
newpoolinfo->mddev = mddev; |
|
newpoolinfo->raid_disks = raid_disks * 2; |
|
|
|
ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, |
|
rbio_pool_free, newpoolinfo); |
|
if (ret) { |
|
kfree(newpoolinfo); |
|
return ret; |
|
} |
|
newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
|
raid_disks, 2), |
|
GFP_KERNEL); |
|
if (!newmirrors) { |
|
kfree(newpoolinfo); |
|
mempool_exit(&newpool); |
|
return -ENOMEM; |
|
} |
|
|
|
freeze_array(conf, 0); |
|
|
|
/* ok, everything is stopped */ |
|
oldpool = conf->r1bio_pool; |
|
conf->r1bio_pool = newpool; |
|
|
|
for (d = d2 = 0; d < conf->raid_disks; d++) { |
|
struct md_rdev *rdev = conf->mirrors[d].rdev; |
|
if (rdev && rdev->raid_disk != d2) { |
|
sysfs_unlink_rdev(mddev, rdev); |
|
rdev->raid_disk = d2; |
|
sysfs_unlink_rdev(mddev, rdev); |
|
if (sysfs_link_rdev(mddev, rdev)) |
|
pr_warn("md/raid1:%s: cannot register rd%d\n", |
|
mdname(mddev), rdev->raid_disk); |
|
} |
|
if (rdev) |
|
newmirrors[d2++].rdev = rdev; |
|
} |
|
kfree(conf->mirrors); |
|
conf->mirrors = newmirrors; |
|
kfree(conf->poolinfo); |
|
conf->poolinfo = newpoolinfo; |
|
|
|
spin_lock_irqsave(&conf->device_lock, flags); |
|
mddev->degraded += (raid_disks - conf->raid_disks); |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
conf->raid_disks = mddev->raid_disks = raid_disks; |
|
mddev->delta_disks = 0; |
|
|
|
unfreeze_array(conf); |
|
|
|
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
|
md_wakeup_thread(mddev->thread); |
|
|
|
mempool_exit(&oldpool); |
|
return 0; |
|
} |
|
|
|
static void raid1_quiesce(struct mddev *mddev, int quiesce) |
|
{ |
|
struct r1conf *conf = mddev->private; |
|
|
|
if (quiesce) |
|
freeze_array(conf, 0); |
|
else |
|
unfreeze_array(conf); |
|
} |
|
|
|
static void *raid1_takeover(struct mddev *mddev) |
|
{ |
|
/* raid1 can take over: |
|
* raid5 with 2 devices, any layout or chunk size |
|
*/ |
|
if (mddev->level == 5 && mddev->raid_disks == 2) { |
|
struct r1conf *conf; |
|
mddev->new_level = 1; |
|
mddev->new_layout = 0; |
|
mddev->new_chunk_sectors = 0; |
|
conf = setup_conf(mddev); |
|
if (!IS_ERR(conf)) { |
|
/* Array must appear to be quiesced */ |
|
conf->array_frozen = 1; |
|
mddev_clear_unsupported_flags(mddev, |
|
UNSUPPORTED_MDDEV_FLAGS); |
|
} |
|
return conf; |
|
} |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
static struct md_personality raid1_personality = |
|
{ |
|
.name = "raid1", |
|
.level = 1, |
|
.owner = THIS_MODULE, |
|
.make_request = raid1_make_request, |
|
.run = raid1_run, |
|
.free = raid1_free, |
|
.status = raid1_status, |
|
.error_handler = raid1_error, |
|
.hot_add_disk = raid1_add_disk, |
|
.hot_remove_disk= raid1_remove_disk, |
|
.spare_active = raid1_spare_active, |
|
.sync_request = raid1_sync_request, |
|
.resize = raid1_resize, |
|
.size = raid1_size, |
|
.check_reshape = raid1_reshape, |
|
.quiesce = raid1_quiesce, |
|
.takeover = raid1_takeover, |
|
}; |
|
|
|
static int __init raid_init(void) |
|
{ |
|
return register_md_personality(&raid1_personality); |
|
} |
|
|
|
static void raid_exit(void) |
|
{ |
|
unregister_md_personality(&raid1_personality); |
|
} |
|
|
|
module_init(raid_init); |
|
module_exit(raid_exit); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
|
MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
|
MODULE_ALIAS("md-raid1"); |
|
MODULE_ALIAS("md-level-1"); |
|
|
|
module_param(max_queued_requests, int, S_IRUGO|S_IWUSR);
|
|
|