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5246 lines
144 KiB
5246 lines
144 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* raid10.c : Multiple Devices driver for Linux |
|
* |
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* Copyright (C) 2000-2004 Neil Brown |
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* |
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* RAID-10 support for md. |
|
* |
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* Base on code in raid1.c. See raid1.c for further copyright information. |
|
*/ |
|
|
|
#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/kthread.h> |
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#include <linux/raid/md_p.h> |
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#include <trace/events/block.h> |
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#include "md.h" |
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#include "raid10.h" |
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#include "raid0.h" |
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#include "md-bitmap.h" |
|
|
|
/* |
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* RAID10 provides a combination of RAID0 and RAID1 functionality. |
|
* The layout of data is defined by |
|
* chunk_size |
|
* raid_disks |
|
* near_copies (stored in low byte of layout) |
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* far_copies (stored in second byte of layout) |
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* far_offset (stored in bit 16 of layout ) |
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* use_far_sets (stored in bit 17 of layout ) |
|
* use_far_sets_bugfixed (stored in bit 18 of layout ) |
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* |
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* The data to be stored is divided into chunks using chunksize. Each device |
|
* is divided into far_copies sections. In each section, chunks are laid out |
|
* in a style similar to raid0, but near_copies copies of each chunk is stored |
|
* (each on a different drive). The starting device for each section is offset |
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* near_copies from the starting device of the previous section. Thus there |
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* are (near_copies * far_copies) of each chunk, and each is on a different |
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* drive. near_copies and far_copies must be at least one, and their product |
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* is at most raid_disks. |
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* |
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* If far_offset is true, then the far_copies are handled a bit differently. |
|
* The copies are still in different stripes, but instead of being very far |
|
* apart on disk, there are adjacent stripes. |
|
* |
|
* The far and offset algorithms are handled slightly differently if |
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* 'use_far_sets' is true. In this case, the array's devices are grouped into |
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* sets that are (near_copies * far_copies) in size. The far copied stripes |
|
* are still shifted by 'near_copies' devices, but this shifting stays confined |
|
* to the set rather than the entire array. This is done to improve the number |
|
* of device combinations that can fail without causing the array to fail. |
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* Example 'far' algorithm w/o 'use_far_sets' (each letter represents a chunk |
|
* on a device): |
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* A B C D A B C D E |
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* ... ... |
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* D A B C E A B C D |
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* Example 'far' algorithm w/ 'use_far_sets' enabled (sets illustrated w/ []'s): |
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* [A B] [C D] [A B] [C D E] |
|
* |...| |...| |...| | ... | |
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* [B A] [D C] [B A] [E C D] |
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*/ |
|
|
|
static void allow_barrier(struct r10conf *conf); |
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static void lower_barrier(struct r10conf *conf); |
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static int _enough(struct r10conf *conf, int previous, int ignore); |
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static int enough(struct r10conf *conf, int ignore); |
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static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, |
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int *skipped); |
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static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio); |
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static void end_reshape_write(struct bio *bio); |
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static void end_reshape(struct r10conf *conf); |
|
|
|
#define raid10_log(md, fmt, args...) \ |
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do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid10 " fmt, ##args); } while (0) |
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|
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#include "raid1-10.c" |
|
|
|
/* |
|
* for resync bio, r10bio pointer can be retrieved from the per-bio |
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* 'struct resync_pages'. |
|
*/ |
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static inline struct r10bio *get_resync_r10bio(struct bio *bio) |
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{ |
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return get_resync_pages(bio)->raid_bio; |
|
} |
|
|
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static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data) |
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{ |
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struct r10conf *conf = data; |
|
int size = offsetof(struct r10bio, devs[conf->geo.raid_disks]); |
|
|
|
/* allocate a r10bio 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_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
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/* amount of memory to reserve for resync requests */ |
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#define RESYNC_WINDOW (1024*1024) |
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/* maximum number of concurrent requests, memory permitting */ |
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#define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE) |
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#define CLUSTER_RESYNC_WINDOW (32 * RESYNC_WINDOW) |
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#define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) |
|
|
|
/* |
|
* When performing a resync, we need to read and compare, so |
|
* we need as many pages are there are copies. |
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* When performing a recovery, we need 2 bios, one for read, |
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* one for write (we recover only one drive per r10buf) |
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* |
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*/ |
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static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) |
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{ |
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struct r10conf *conf = data; |
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struct r10bio *r10_bio; |
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struct bio *bio; |
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int j; |
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int nalloc, nalloc_rp; |
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struct resync_pages *rps; |
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|
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r10_bio = r10bio_pool_alloc(gfp_flags, conf); |
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if (!r10_bio) |
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return NULL; |
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|
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if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery) || |
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test_bit(MD_RECOVERY_RESHAPE, &conf->mddev->recovery)) |
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nalloc = conf->copies; /* resync */ |
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else |
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nalloc = 2; /* recovery */ |
|
|
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/* allocate once for all bios */ |
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if (!conf->have_replacement) |
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nalloc_rp = nalloc; |
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else |
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nalloc_rp = nalloc * 2; |
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rps = kmalloc_array(nalloc_rp, sizeof(struct resync_pages), gfp_flags); |
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if (!rps) |
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goto out_free_r10bio; |
|
|
|
/* |
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* Allocate bios. |
|
*/ |
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for (j = nalloc ; 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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r10_bio->devs[j].bio = bio; |
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if (!conf->have_replacement) |
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continue; |
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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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r10_bio->devs[j].repl_bio = bio; |
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} |
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/* |
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* Allocate RESYNC_PAGES data pages and attach them |
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* where needed. |
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*/ |
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for (j = 0; j < nalloc; j++) { |
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struct bio *rbio = r10_bio->devs[j].repl_bio; |
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struct resync_pages *rp, *rp_repl; |
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|
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rp = &rps[j]; |
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if (rbio) |
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rp_repl = &rps[nalloc + j]; |
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|
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bio = r10_bio->devs[j].bio; |
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|
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if (!j || test_bit(MD_RECOVERY_SYNC, |
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&conf->mddev->recovery)) { |
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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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|
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rp->raid_bio = r10_bio; |
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bio->bi_private = rp; |
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if (rbio) { |
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memcpy(rp_repl, rp, sizeof(*rp)); |
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rbio->bi_private = rp_repl; |
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} |
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} |
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|
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return r10_bio; |
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|
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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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|
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j = 0; |
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out_free_bio: |
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for ( ; j < nalloc; j++) { |
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if (r10_bio->devs[j].bio) |
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bio_put(r10_bio->devs[j].bio); |
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if (r10_bio->devs[j].repl_bio) |
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bio_put(r10_bio->devs[j].repl_bio); |
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} |
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kfree(rps); |
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out_free_r10bio: |
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rbio_pool_free(r10_bio, conf); |
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return NULL; |
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} |
|
|
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static void r10buf_pool_free(void *__r10_bio, void *data) |
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{ |
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struct r10conf *conf = data; |
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struct r10bio *r10bio = __r10_bio; |
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int j; |
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struct resync_pages *rp = NULL; |
|
|
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for (j = conf->copies; j--; ) { |
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struct bio *bio = r10bio->devs[j].bio; |
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|
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if (bio) { |
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rp = get_resync_pages(bio); |
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resync_free_pages(rp); |
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bio_put(bio); |
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} |
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|
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bio = r10bio->devs[j].repl_bio; |
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if (bio) |
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bio_put(bio); |
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} |
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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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|
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rbio_pool_free(r10bio, conf); |
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} |
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|
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static void put_all_bios(struct r10conf *conf, struct r10bio *r10_bio) |
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{ |
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int i; |
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|
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for (i = 0; i < conf->geo.raid_disks; i++) { |
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struct bio **bio = & r10_bio->devs[i].bio; |
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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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bio = &r10_bio->devs[i].repl_bio; |
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if (r10_bio->read_slot < 0 && !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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|
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static void free_r10bio(struct r10bio *r10_bio) |
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{ |
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struct r10conf *conf = r10_bio->mddev->private; |
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|
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put_all_bios(conf, r10_bio); |
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mempool_free(r10_bio, &conf->r10bio_pool); |
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} |
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|
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static void put_buf(struct r10bio *r10_bio) |
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{ |
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struct r10conf *conf = r10_bio->mddev->private; |
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|
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mempool_free(r10_bio, &conf->r10buf_pool); |
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|
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lower_barrier(conf); |
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} |
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|
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static void reschedule_retry(struct r10bio *r10_bio) |
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{ |
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unsigned long flags; |
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struct mddev *mddev = r10_bio->mddev; |
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struct r10conf *conf = mddev->private; |
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|
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spin_lock_irqsave(&conf->device_lock, flags); |
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list_add(&r10_bio->retry_list, &conf->retry_list); |
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conf->nr_queued ++; |
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spin_unlock_irqrestore(&conf->device_lock, flags); |
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|
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/* wake up frozen array... */ |
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wake_up(&conf->wait_barrier); |
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|
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md_wakeup_thread(mddev->thread); |
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} |
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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 raid_end_bio_io(struct r10bio *r10_bio) |
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{ |
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struct bio *bio = r10_bio->master_bio; |
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struct r10conf *conf = r10_bio->mddev->private; |
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|
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if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) |
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bio->bi_status = BLK_STS_IOERR; |
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|
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if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) |
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bio_end_io_acct(bio, r10_bio->start_time); |
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bio_endio(bio); |
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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. |
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*/ |
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allow_barrier(conf); |
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|
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free_r10bio(r10_bio); |
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} |
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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 slot, struct r10bio *r10_bio) |
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{ |
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struct r10conf *conf = r10_bio->mddev->private; |
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|
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conf->mirrors[r10_bio->devs[slot].devnum].head_position = |
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r10_bio->devs[slot].addr + (r10_bio->sectors); |
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} |
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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 r10conf *conf, struct r10bio *r10_bio, |
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struct bio *bio, int *slotp, int *replp) |
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{ |
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int slot; |
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int repl = 0; |
|
|
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for (slot = 0; slot < conf->geo.raid_disks; slot++) { |
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if (r10_bio->devs[slot].bio == bio) |
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break; |
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if (r10_bio->devs[slot].repl_bio == bio) { |
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repl = 1; |
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break; |
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} |
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} |
|
|
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update_head_pos(slot, r10_bio); |
|
|
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if (slotp) |
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*slotp = slot; |
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if (replp) |
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*replp = repl; |
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return r10_bio->devs[slot].devnum; |
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} |
|
|
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static void raid10_end_read_request(struct bio *bio) |
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{ |
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int uptodate = !bio->bi_status; |
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struct r10bio *r10_bio = bio->bi_private; |
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int slot; |
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struct md_rdev *rdev; |
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struct r10conf *conf = r10_bio->mddev->private; |
|
|
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slot = r10_bio->read_slot; |
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rdev = r10_bio->devs[slot].rdev; |
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/* |
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* this branch is our 'one mirror IO has finished' event handler: |
|
*/ |
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update_head_pos(slot, r10_bio); |
|
|
|
if (uptodate) { |
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/* |
|
* Set R10BIO_Uptodate in our master bio, so that |
|
* we will return a good error code to the higher |
|
* levels even if IO on some other mirrored buffer fails. |
|
* |
|
* The 'master' represents the composite IO operation to |
|
* user-side. So if something waits for IO, then it will |
|
* wait for the 'master' bio. |
|
*/ |
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set_bit(R10BIO_Uptodate, &r10_bio->state); |
|
} else { |
|
/* If all other devices that store this block have |
|
* failed, we want to return the error upwards rather |
|
* than fail the last device. Here we redefine |
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* "uptodate" to mean "Don't want to retry" |
|
*/ |
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if (!_enough(conf, test_bit(R10BIO_Previous, &r10_bio->state), |
|
rdev->raid_disk)) |
|
uptodate = 1; |
|
} |
|
if (uptodate) { |
|
raid_end_bio_io(r10_bio); |
|
rdev_dec_pending(rdev, conf->mddev); |
|
} else { |
|
/* |
|
* oops, read error - keep the refcount on the rdev |
|
*/ |
|
char b[BDEVNAME_SIZE]; |
|
pr_err_ratelimited("md/raid10:%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)r10_bio->sector); |
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set_bit(R10BIO_ReadError, &r10_bio->state); |
|
reschedule_retry(r10_bio); |
|
} |
|
} |
|
|
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static void close_write(struct r10bio *r10_bio) |
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{ |
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/* clear the bitmap if all writes complete successfully */ |
|
md_bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector, |
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r10_bio->sectors, |
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!test_bit(R10BIO_Degraded, &r10_bio->state), |
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0); |
|
md_write_end(r10_bio->mddev); |
|
} |
|
|
|
static void one_write_done(struct r10bio *r10_bio) |
|
{ |
|
if (atomic_dec_and_test(&r10_bio->remaining)) { |
|
if (test_bit(R10BIO_WriteError, &r10_bio->state)) |
|
reschedule_retry(r10_bio); |
|
else { |
|
close_write(r10_bio); |
|
if (test_bit(R10BIO_MadeGood, &r10_bio->state)) |
|
reschedule_retry(r10_bio); |
|
else |
|
raid_end_bio_io(r10_bio); |
|
} |
|
} |
|
} |
|
|
|
static void raid10_end_write_request(struct bio *bio) |
|
{ |
|
struct r10bio *r10_bio = bio->bi_private; |
|
int dev; |
|
int dec_rdev = 1; |
|
struct r10conf *conf = r10_bio->mddev->private; |
|
int slot, repl; |
|
struct md_rdev *rdev = NULL; |
|
struct bio *to_put = NULL; |
|
bool discard_error; |
|
|
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discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
|
|
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dev = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
|
|
|
if (repl) |
|
rdev = conf->mirrors[dev].replacement; |
|
if (!rdev) { |
|
smp_rmb(); |
|
repl = 0; |
|
rdev = conf->mirrors[dev].rdev; |
|
} |
|
/* |
|
* this branch is our 'one mirror IO has finished' event handler: |
|
*/ |
|
if (bio->bi_status && !discard_error) { |
|
if (repl) |
|
/* Never record new bad blocks to replacement, |
|
* just fail it. |
|
*/ |
|
md_error(rdev->mddev, rdev); |
|
else { |
|
set_bit(WriteErrorSeen, &rdev->flags); |
|
if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
|
set_bit(MD_RECOVERY_NEEDED, |
|
&rdev->mddev->recovery); |
|
|
|
dec_rdev = 0; |
|
if (test_bit(FailFast, &rdev->flags) && |
|
(bio->bi_opf & MD_FAILFAST)) { |
|
md_error(rdev->mddev, rdev); |
|
} |
|
|
|
/* |
|
* When the device is faulty, it is not necessary to |
|
* handle write error. |
|
*/ |
|
if (!test_bit(Faulty, &rdev->flags)) |
|
set_bit(R10BIO_WriteError, &r10_bio->state); |
|
else { |
|
/* Fail the request */ |
|
set_bit(R10BIO_Degraded, &r10_bio->state); |
|
r10_bio->devs[slot].bio = NULL; |
|
to_put = bio; |
|
dec_rdev = 1; |
|
} |
|
} |
|
} else { |
|
/* |
|
* Set R10BIO_Uptodate in our master bio, so that |
|
* we will return a good error code for to the higher |
|
* levels even if IO on some other mirrored buffer fails. |
|
* |
|
* The 'master' represents the composite IO operation to |
|
* user-side. So if something waits for IO, then it will |
|
* wait for the 'master' bio. |
|
*/ |
|
sector_t first_bad; |
|
int bad_sectors; |
|
|
|
/* |
|
* Do not set R10BIO_Uptodate if the current device is |
|
* rebuilding or Faulty. This is because we cannot use |
|
* such device for properly reading the data back (we could |
|
* potentially use it, if the current write would have felt |
|
* before rdev->recovery_offset, but for simplicity we don't |
|
* check this here. |
|
*/ |
|
if (test_bit(In_sync, &rdev->flags) && |
|
!test_bit(Faulty, &rdev->flags)) |
|
set_bit(R10BIO_Uptodate, &r10_bio->state); |
|
|
|
/* Maybe we can clear some bad blocks. */ |
|
if (is_badblock(rdev, |
|
r10_bio->devs[slot].addr, |
|
r10_bio->sectors, |
|
&first_bad, &bad_sectors) && !discard_error) { |
|
bio_put(bio); |
|
if (repl) |
|
r10_bio->devs[slot].repl_bio = IO_MADE_GOOD; |
|
else |
|
r10_bio->devs[slot].bio = IO_MADE_GOOD; |
|
dec_rdev = 0; |
|
set_bit(R10BIO_MadeGood, &r10_bio->state); |
|
} |
|
} |
|
|
|
/* |
|
* |
|
* Let's see if all mirrored write operations have finished |
|
* already. |
|
*/ |
|
one_write_done(r10_bio); |
|
if (dec_rdev) |
|
rdev_dec_pending(rdev, conf->mddev); |
|
if (to_put) |
|
bio_put(to_put); |
|
} |
|
|
|
/* |
|
* RAID10 layout manager |
|
* As well as the chunksize and raid_disks count, there are two |
|
* parameters: near_copies and far_copies. |
|
* near_copies * far_copies must be <= raid_disks. |
|
* Normally one of these will be 1. |
|
* If both are 1, we get raid0. |
|
* If near_copies == raid_disks, we get raid1. |
|
* |
|
* Chunks are laid out in raid0 style with near_copies copies of the |
|
* first chunk, followed by near_copies copies of the next chunk and |
|
* so on. |
|
* If far_copies > 1, then after 1/far_copies of the array has been assigned |
|
* as described above, we start again with a device offset of near_copies. |
|
* So we effectively have another copy of the whole array further down all |
|
* the drives, but with blocks on different drives. |
|
* With this layout, and block is never stored twice on the one device. |
|
* |
|
* raid10_find_phys finds the sector offset of a given virtual sector |
|
* on each device that it is on. |
|
* |
|
* raid10_find_virt does the reverse mapping, from a device and a |
|
* sector offset to a virtual address |
|
*/ |
|
|
|
static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio) |
|
{ |
|
int n,f; |
|
sector_t sector; |
|
sector_t chunk; |
|
sector_t stripe; |
|
int dev; |
|
int slot = 0; |
|
int last_far_set_start, last_far_set_size; |
|
|
|
last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1; |
|
last_far_set_start *= geo->far_set_size; |
|
|
|
last_far_set_size = geo->far_set_size; |
|
last_far_set_size += (geo->raid_disks % geo->far_set_size); |
|
|
|
/* now calculate first sector/dev */ |
|
chunk = r10bio->sector >> geo->chunk_shift; |
|
sector = r10bio->sector & geo->chunk_mask; |
|
|
|
chunk *= geo->near_copies; |
|
stripe = chunk; |
|
dev = sector_div(stripe, geo->raid_disks); |
|
if (geo->far_offset) |
|
stripe *= geo->far_copies; |
|
|
|
sector += stripe << geo->chunk_shift; |
|
|
|
/* and calculate all the others */ |
|
for (n = 0; n < geo->near_copies; n++) { |
|
int d = dev; |
|
int set; |
|
sector_t s = sector; |
|
r10bio->devs[slot].devnum = d; |
|
r10bio->devs[slot].addr = s; |
|
slot++; |
|
|
|
for (f = 1; f < geo->far_copies; f++) { |
|
set = d / geo->far_set_size; |
|
d += geo->near_copies; |
|
|
|
if ((geo->raid_disks % geo->far_set_size) && |
|
(d > last_far_set_start)) { |
|
d -= last_far_set_start; |
|
d %= last_far_set_size; |
|
d += last_far_set_start; |
|
} else { |
|
d %= geo->far_set_size; |
|
d += geo->far_set_size * set; |
|
} |
|
s += geo->stride; |
|
r10bio->devs[slot].devnum = d; |
|
r10bio->devs[slot].addr = s; |
|
slot++; |
|
} |
|
dev++; |
|
if (dev >= geo->raid_disks) { |
|
dev = 0; |
|
sector += (geo->chunk_mask + 1); |
|
} |
|
} |
|
} |
|
|
|
static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio) |
|
{ |
|
struct geom *geo = &conf->geo; |
|
|
|
if (conf->reshape_progress != MaxSector && |
|
((r10bio->sector >= conf->reshape_progress) != |
|
conf->mddev->reshape_backwards)) { |
|
set_bit(R10BIO_Previous, &r10bio->state); |
|
geo = &conf->prev; |
|
} else |
|
clear_bit(R10BIO_Previous, &r10bio->state); |
|
|
|
__raid10_find_phys(geo, r10bio); |
|
} |
|
|
|
static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev) |
|
{ |
|
sector_t offset, chunk, vchunk; |
|
/* Never use conf->prev as this is only called during resync |
|
* or recovery, so reshape isn't happening |
|
*/ |
|
struct geom *geo = &conf->geo; |
|
int far_set_start = (dev / geo->far_set_size) * geo->far_set_size; |
|
int far_set_size = geo->far_set_size; |
|
int last_far_set_start; |
|
|
|
if (geo->raid_disks % geo->far_set_size) { |
|
last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1; |
|
last_far_set_start *= geo->far_set_size; |
|
|
|
if (dev >= last_far_set_start) { |
|
far_set_size = geo->far_set_size; |
|
far_set_size += (geo->raid_disks % geo->far_set_size); |
|
far_set_start = last_far_set_start; |
|
} |
|
} |
|
|
|
offset = sector & geo->chunk_mask; |
|
if (geo->far_offset) { |
|
int fc; |
|
chunk = sector >> geo->chunk_shift; |
|
fc = sector_div(chunk, geo->far_copies); |
|
dev -= fc * geo->near_copies; |
|
if (dev < far_set_start) |
|
dev += far_set_size; |
|
} else { |
|
while (sector >= geo->stride) { |
|
sector -= geo->stride; |
|
if (dev < (geo->near_copies + far_set_start)) |
|
dev += far_set_size - geo->near_copies; |
|
else |
|
dev -= geo->near_copies; |
|
} |
|
chunk = sector >> geo->chunk_shift; |
|
} |
|
vchunk = chunk * geo->raid_disks + dev; |
|
sector_div(vchunk, geo->near_copies); |
|
return (vchunk << geo->chunk_shift) + offset; |
|
} |
|
|
|
/* |
|
* 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. |
|
*/ |
|
|
|
/* |
|
* FIXME: possibly should rethink readbalancing and do it differently |
|
* depending on near_copies / far_copies geometry. |
|
*/ |
|
static struct md_rdev *read_balance(struct r10conf *conf, |
|
struct r10bio *r10_bio, |
|
int *max_sectors) |
|
{ |
|
const sector_t this_sector = r10_bio->sector; |
|
int disk, slot; |
|
int sectors = r10_bio->sectors; |
|
int best_good_sectors; |
|
sector_t new_distance, best_dist; |
|
struct md_rdev *best_dist_rdev, *best_pending_rdev, *rdev = NULL; |
|
int do_balance; |
|
int best_dist_slot, best_pending_slot; |
|
bool has_nonrot_disk = false; |
|
unsigned int min_pending; |
|
struct geom *geo = &conf->geo; |
|
|
|
raid10_find_phys(conf, r10_bio); |
|
rcu_read_lock(); |
|
best_dist_slot = -1; |
|
min_pending = UINT_MAX; |
|
best_dist_rdev = NULL; |
|
best_pending_rdev = NULL; |
|
best_dist = MaxSector; |
|
best_good_sectors = 0; |
|
do_balance = 1; |
|
clear_bit(R10BIO_FailFast, &r10_bio->state); |
|
/* |
|
* Check if we can balance. We can balance on the whole |
|
* device if no resync is going on (recovery is ok), or below |
|
* the resync window. We take the first readable disk when |
|
* above the resync window. |
|
*/ |
|
if ((conf->mddev->recovery_cp < MaxSector |
|
&& (this_sector + sectors >= conf->next_resync)) || |
|
(mddev_is_clustered(conf->mddev) && |
|
md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
|
this_sector + sectors))) |
|
do_balance = 0; |
|
|
|
for (slot = 0; slot < conf->copies ; slot++) { |
|
sector_t first_bad; |
|
int bad_sectors; |
|
sector_t dev_sector; |
|
unsigned int pending; |
|
bool nonrot; |
|
|
|
if (r10_bio->devs[slot].bio == IO_BLOCKED) |
|
continue; |
|
disk = r10_bio->devs[slot].devnum; |
|
rdev = rcu_dereference(conf->mirrors[disk].replacement); |
|
if (rdev == NULL || test_bit(Faulty, &rdev->flags) || |
|
r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) |
|
rdev = rcu_dereference(conf->mirrors[disk].rdev); |
|
if (rdev == NULL || |
|
test_bit(Faulty, &rdev->flags)) |
|
continue; |
|
if (!test_bit(In_sync, &rdev->flags) && |
|
r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) |
|
continue; |
|
|
|
dev_sector = r10_bio->devs[slot].addr; |
|
if (is_badblock(rdev, dev_sector, sectors, |
|
&first_bad, &bad_sectors)) { |
|
if (best_dist < MaxSector) |
|
/* Already have a better slot */ |
|
continue; |
|
if (first_bad <= dev_sector) { |
|
/* Cannot read here. If this is the |
|
* 'primary' device, then we must not read |
|
* beyond 'bad_sectors' from another device. |
|
*/ |
|
bad_sectors -= (dev_sector - first_bad); |
|
if (!do_balance && sectors > bad_sectors) |
|
sectors = bad_sectors; |
|
if (best_good_sectors > sectors) |
|
best_good_sectors = sectors; |
|
} else { |
|
sector_t good_sectors = |
|
first_bad - dev_sector; |
|
if (good_sectors > best_good_sectors) { |
|
best_good_sectors = good_sectors; |
|
best_dist_slot = slot; |
|
best_dist_rdev = rdev; |
|
} |
|
if (!do_balance) |
|
/* Must read from here */ |
|
break; |
|
} |
|
continue; |
|
} else |
|
best_good_sectors = sectors; |
|
|
|
if (!do_balance) |
|
break; |
|
|
|
nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
|
has_nonrot_disk |= nonrot; |
|
pending = atomic_read(&rdev->nr_pending); |
|
if (min_pending > pending && nonrot) { |
|
min_pending = pending; |
|
best_pending_slot = slot; |
|
best_pending_rdev = rdev; |
|
} |
|
|
|
if (best_dist_slot >= 0) |
|
/* At least 2 disks to choose from so failfast is OK */ |
|
set_bit(R10BIO_FailFast, &r10_bio->state); |
|
/* This optimisation is debatable, and completely destroys |
|
* sequential read speed for 'far copies' arrays. So only |
|
* keep it for 'near' arrays, and review those later. |
|
*/ |
|
if (geo->near_copies > 1 && !pending) |
|
new_distance = 0; |
|
|
|
/* for far > 1 always use the lowest address */ |
|
else if (geo->far_copies > 1) |
|
new_distance = r10_bio->devs[slot].addr; |
|
else |
|
new_distance = abs(r10_bio->devs[slot].addr - |
|
conf->mirrors[disk].head_position); |
|
|
|
if (new_distance < best_dist) { |
|
best_dist = new_distance; |
|
best_dist_slot = slot; |
|
best_dist_rdev = rdev; |
|
} |
|
} |
|
if (slot >= conf->copies) { |
|
if (has_nonrot_disk) { |
|
slot = best_pending_slot; |
|
rdev = best_pending_rdev; |
|
} else { |
|
slot = best_dist_slot; |
|
rdev = best_dist_rdev; |
|
} |
|
} |
|
|
|
if (slot >= 0) { |
|
atomic_inc(&rdev->nr_pending); |
|
r10_bio->read_slot = slot; |
|
} else |
|
rdev = NULL; |
|
rcu_read_unlock(); |
|
*max_sectors = best_good_sectors; |
|
|
|
return rdev; |
|
} |
|
|
|
static void flush_pending_writes(struct r10conf *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 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; |
|
} |
|
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. |
|
*/ |
|
|
|
static void raise_barrier(struct r10conf *conf, int force) |
|
{ |
|
BUG_ON(force && !conf->barrier); |
|
spin_lock_irq(&conf->resync_lock); |
|
|
|
/* Wait until no block IO is waiting (unless 'force') */ |
|
wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting, |
|
conf->resync_lock); |
|
|
|
/* block any new IO from starting */ |
|
conf->barrier++; |
|
|
|
/* Now wait for all pending IO to complete */ |
|
wait_event_lock_irq(conf->wait_barrier, |
|
!atomic_read(&conf->nr_pending) && conf->barrier < RESYNC_DEPTH, |
|
conf->resync_lock); |
|
|
|
spin_unlock_irq(&conf->resync_lock); |
|
} |
|
|
|
static void lower_barrier(struct r10conf *conf) |
|
{ |
|
unsigned long flags; |
|
spin_lock_irqsave(&conf->resync_lock, flags); |
|
conf->barrier--; |
|
spin_unlock_irqrestore(&conf->resync_lock, flags); |
|
wake_up(&conf->wait_barrier); |
|
} |
|
|
|
static void wait_barrier(struct r10conf *conf) |
|
{ |
|
spin_lock_irq(&conf->resync_lock); |
|
if (conf->barrier) { |
|
struct bio_list *bio_list = current->bio_list; |
|
conf->nr_waiting++; |
|
/* Wait for the barrier to drop. |
|
* However if there are already pending |
|
* requests (preventing the barrier from |
|
* rising completely), and the |
|
* pre-process bio queue isn't empty, |
|
* then don't wait, as we need to empty |
|
* that queue to get the nr_pending |
|
* count down. |
|
*/ |
|
raid10_log(conf->mddev, "wait barrier"); |
|
wait_event_lock_irq(conf->wait_barrier, |
|
!conf->barrier || |
|
(atomic_read(&conf->nr_pending) && |
|
bio_list && |
|
(!bio_list_empty(&bio_list[0]) || |
|
!bio_list_empty(&bio_list[1]))) || |
|
/* move on if recovery thread is |
|
* blocked by us |
|
*/ |
|
(conf->mddev->thread->tsk == current && |
|
test_bit(MD_RECOVERY_RUNNING, |
|
&conf->mddev->recovery) && |
|
conf->nr_queued > 0), |
|
conf->resync_lock); |
|
conf->nr_waiting--; |
|
if (!conf->nr_waiting) |
|
wake_up(&conf->wait_barrier); |
|
} |
|
atomic_inc(&conf->nr_pending); |
|
spin_unlock_irq(&conf->resync_lock); |
|
} |
|
|
|
static void allow_barrier(struct r10conf *conf) |
|
{ |
|
if ((atomic_dec_and_test(&conf->nr_pending)) || |
|
(conf->array_freeze_pending)) |
|
wake_up(&conf->wait_barrier); |
|
} |
|
|
|
static void freeze_array(struct r10conf *conf, int extra) |
|
{ |
|
/* stop syncio and normal IO and wait for everything to |
|
* go quiet. |
|
* We increment barrier and nr_waiting, and then |
|
* wait until nr_pending match nr_queued+extra |
|
* This is called in the context of one normal IO request |
|
* that has failed. Thus any sync request that might be pending |
|
* will be blocked by nr_pending, and we need to wait for |
|
* pending IO requests to complete or be queued for re-try. |
|
* Thus the number queued (nr_queued) plus this request (extra) |
|
* must match the number of pending IOs (nr_pending) before |
|
* we continue. |
|
*/ |
|
spin_lock_irq(&conf->resync_lock); |
|
conf->array_freeze_pending++; |
|
conf->barrier++; |
|
conf->nr_waiting++; |
|
wait_event_lock_irq_cmd(conf->wait_barrier, |
|
atomic_read(&conf->nr_pending) == conf->nr_queued+extra, |
|
conf->resync_lock, |
|
flush_pending_writes(conf)); |
|
|
|
conf->array_freeze_pending--; |
|
spin_unlock_irq(&conf->resync_lock); |
|
} |
|
|
|
static void unfreeze_array(struct r10conf *conf) |
|
{ |
|
/* reverse the effect of the freeze */ |
|
spin_lock_irq(&conf->resync_lock); |
|
conf->barrier--; |
|
conf->nr_waiting--; |
|
wake_up(&conf->wait_barrier); |
|
spin_unlock_irq(&conf->resync_lock); |
|
} |
|
|
|
static sector_t choose_data_offset(struct r10bio *r10_bio, |
|
struct md_rdev *rdev) |
|
{ |
|
if (!test_bit(MD_RECOVERY_RESHAPE, &rdev->mddev->recovery) || |
|
test_bit(R10BIO_Previous, &r10_bio->state)) |
|
return rdev->data_offset; |
|
else |
|
return rdev->new_data_offset; |
|
} |
|
|
|
struct raid10_plug_cb { |
|
struct blk_plug_cb cb; |
|
struct bio_list pending; |
|
int pending_cnt; |
|
}; |
|
|
|
static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule) |
|
{ |
|
struct raid10_plug_cb *plug = container_of(cb, struct raid10_plug_cb, |
|
cb); |
|
struct mddev *mddev = plug->cb.data; |
|
struct r10conf *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); |
|
md_bitmap_unplug(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; |
|
} |
|
kfree(plug); |
|
} |
|
|
|
/* |
|
* 1. 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. |
|
* 2. If IO spans the reshape position. Need to wait for reshape to pass. |
|
*/ |
|
static void regular_request_wait(struct mddev *mddev, struct r10conf *conf, |
|
struct bio *bio, sector_t sectors) |
|
{ |
|
wait_barrier(conf); |
|
while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
|
bio->bi_iter.bi_sector < conf->reshape_progress && |
|
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) { |
|
raid10_log(conf->mddev, "wait reshape"); |
|
allow_barrier(conf); |
|
wait_event(conf->wait_barrier, |
|
conf->reshape_progress <= bio->bi_iter.bi_sector || |
|
conf->reshape_progress >= bio->bi_iter.bi_sector + |
|
sectors); |
|
wait_barrier(conf); |
|
} |
|
} |
|
|
|
static void raid10_read_request(struct mddev *mddev, struct bio *bio, |
|
struct r10bio *r10_bio) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
struct bio *read_bio; |
|
const int op = bio_op(bio); |
|
const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); |
|
int max_sectors; |
|
struct md_rdev *rdev; |
|
char b[BDEVNAME_SIZE]; |
|
int slot = r10_bio->read_slot; |
|
struct md_rdev *err_rdev = NULL; |
|
gfp_t gfp = GFP_NOIO; |
|
|
|
if (slot >= 0 && r10_bio->devs[slot].rdev) { |
|
/* |
|
* This is an error retry, but we cannot |
|
* safely dereference the rdev in the r10_bio, |
|
* we must use the one in conf. |
|
* If it has already been disconnected (unlikely) |
|
* we lose the device name in error messages. |
|
*/ |
|
int disk; |
|
/* |
|
* As we are blocking raid10, it is a little safer to |
|
* use __GFP_HIGH. |
|
*/ |
|
gfp = GFP_NOIO | __GFP_HIGH; |
|
|
|
rcu_read_lock(); |
|
disk = r10_bio->devs[slot].devnum; |
|
err_rdev = rcu_dereference(conf->mirrors[disk].rdev); |
|
if (err_rdev) |
|
bdevname(err_rdev->bdev, b); |
|
else { |
|
strcpy(b, "???"); |
|
/* This never gets dereferenced */ |
|
err_rdev = r10_bio->devs[slot].rdev; |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
regular_request_wait(mddev, conf, bio, r10_bio->sectors); |
|
rdev = read_balance(conf, r10_bio, &max_sectors); |
|
if (!rdev) { |
|
if (err_rdev) { |
|
pr_crit_ratelimited("md/raid10:%s: %s: unrecoverable I/O read error for block %llu\n", |
|
mdname(mddev), b, |
|
(unsigned long long)r10_bio->sector); |
|
} |
|
raid_end_bio_io(r10_bio); |
|
return; |
|
} |
|
if (err_rdev) |
|
pr_err_ratelimited("md/raid10:%s: %s: redirecting sector %llu to another mirror\n", |
|
mdname(mddev), |
|
bdevname(rdev->bdev, b), |
|
(unsigned long long)r10_bio->sector); |
|
if (max_sectors < bio_sectors(bio)) { |
|
struct bio *split = bio_split(bio, max_sectors, |
|
gfp, &conf->bio_split); |
|
bio_chain(split, bio); |
|
allow_barrier(conf); |
|
submit_bio_noacct(bio); |
|
wait_barrier(conf); |
|
bio = split; |
|
r10_bio->master_bio = bio; |
|
r10_bio->sectors = max_sectors; |
|
} |
|
slot = r10_bio->read_slot; |
|
|
|
if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) |
|
r10_bio->start_time = bio_start_io_acct(bio); |
|
read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set); |
|
|
|
r10_bio->devs[slot].bio = read_bio; |
|
r10_bio->devs[slot].rdev = rdev; |
|
|
|
read_bio->bi_iter.bi_sector = r10_bio->devs[slot].addr + |
|
choose_data_offset(r10_bio, rdev); |
|
bio_set_dev(read_bio, rdev->bdev); |
|
read_bio->bi_end_io = raid10_end_read_request; |
|
bio_set_op_attrs(read_bio, op, do_sync); |
|
if (test_bit(FailFast, &rdev->flags) && |
|
test_bit(R10BIO_FailFast, &r10_bio->state)) |
|
read_bio->bi_opf |= MD_FAILFAST; |
|
read_bio->bi_private = r10_bio; |
|
|
|
if (mddev->gendisk) |
|
trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk), |
|
r10_bio->sector); |
|
submit_bio_noacct(read_bio); |
|
return; |
|
} |
|
|
|
static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio, |
|
struct bio *bio, bool replacement, |
|
int n_copy) |
|
{ |
|
const int op = bio_op(bio); |
|
const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); |
|
const unsigned long do_fua = (bio->bi_opf & REQ_FUA); |
|
unsigned long flags; |
|
struct blk_plug_cb *cb; |
|
struct raid10_plug_cb *plug = NULL; |
|
struct r10conf *conf = mddev->private; |
|
struct md_rdev *rdev; |
|
int devnum = r10_bio->devs[n_copy].devnum; |
|
struct bio *mbio; |
|
|
|
if (replacement) { |
|
rdev = conf->mirrors[devnum].replacement; |
|
if (rdev == NULL) { |
|
/* Replacement just got moved to main 'rdev' */ |
|
smp_mb(); |
|
rdev = conf->mirrors[devnum].rdev; |
|
} |
|
} else |
|
rdev = conf->mirrors[devnum].rdev; |
|
|
|
mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); |
|
if (replacement) |
|
r10_bio->devs[n_copy].repl_bio = mbio; |
|
else |
|
r10_bio->devs[n_copy].bio = mbio; |
|
|
|
mbio->bi_iter.bi_sector = (r10_bio->devs[n_copy].addr + |
|
choose_data_offset(r10_bio, rdev)); |
|
bio_set_dev(mbio, rdev->bdev); |
|
mbio->bi_end_io = raid10_end_write_request; |
|
bio_set_op_attrs(mbio, op, do_sync | do_fua); |
|
if (!replacement && test_bit(FailFast, |
|
&conf->mirrors[devnum].rdev->flags) |
|
&& enough(conf, devnum)) |
|
mbio->bi_opf |= MD_FAILFAST; |
|
mbio->bi_private = r10_bio; |
|
|
|
if (conf->mddev->gendisk) |
|
trace_block_bio_remap(mbio, disk_devt(conf->mddev->gendisk), |
|
r10_bio->sector); |
|
/* flush_pending_writes() needs access to the rdev so...*/ |
|
mbio->bi_bdev = (void *)rdev; |
|
|
|
atomic_inc(&r10_bio->remaining); |
|
|
|
cb = blk_check_plugged(raid10_unplug, mddev, sizeof(*plug)); |
|
if (cb) |
|
plug = container_of(cb, struct raid10_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); |
|
} |
|
} |
|
|
|
static void wait_blocked_dev(struct mddev *mddev, struct r10bio *r10_bio) |
|
{ |
|
int i; |
|
struct r10conf *conf = mddev->private; |
|
struct md_rdev *blocked_rdev; |
|
|
|
retry_wait: |
|
blocked_rdev = NULL; |
|
rcu_read_lock(); |
|
for (i = 0; i < conf->copies; i++) { |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
|
struct md_rdev *rrdev = rcu_dereference( |
|
conf->mirrors[i].replacement); |
|
if (rdev == rrdev) |
|
rrdev = NULL; |
|
if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
|
atomic_inc(&rdev->nr_pending); |
|
blocked_rdev = rdev; |
|
break; |
|
} |
|
if (rrdev && unlikely(test_bit(Blocked, &rrdev->flags))) { |
|
atomic_inc(&rrdev->nr_pending); |
|
blocked_rdev = rrdev; |
|
break; |
|
} |
|
|
|
if (rdev && test_bit(WriteErrorSeen, &rdev->flags)) { |
|
sector_t first_bad; |
|
sector_t dev_sector = r10_bio->devs[i].addr; |
|
int bad_sectors; |
|
int is_bad; |
|
|
|
/* |
|
* Discard request doesn't care the write result |
|
* so it doesn't need to wait blocked disk here. |
|
*/ |
|
if (!r10_bio->sectors) |
|
continue; |
|
|
|
is_bad = is_badblock(rdev, dev_sector, r10_bio->sectors, |
|
&first_bad, &bad_sectors); |
|
if (is_bad < 0) { |
|
/* |
|
* Mustn't write here until the bad block |
|
* is acknowledged |
|
*/ |
|
atomic_inc(&rdev->nr_pending); |
|
set_bit(BlockedBadBlocks, &rdev->flags); |
|
blocked_rdev = rdev; |
|
break; |
|
} |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
if (unlikely(blocked_rdev)) { |
|
/* Have to wait for this device to get unblocked, then retry */ |
|
allow_barrier(conf); |
|
raid10_log(conf->mddev, "%s wait rdev %d blocked", |
|
__func__, blocked_rdev->raid_disk); |
|
md_wait_for_blocked_rdev(blocked_rdev, mddev); |
|
wait_barrier(conf); |
|
goto retry_wait; |
|
} |
|
} |
|
|
|
static void raid10_write_request(struct mddev *mddev, struct bio *bio, |
|
struct r10bio *r10_bio) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
int i; |
|
sector_t sectors; |
|
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); |
|
} |
|
|
|
sectors = r10_bio->sectors; |
|
regular_request_wait(mddev, conf, bio, sectors); |
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
|
(mddev->reshape_backwards |
|
? (bio->bi_iter.bi_sector < conf->reshape_safe && |
|
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) |
|
: (bio->bi_iter.bi_sector + sectors > conf->reshape_safe && |
|
bio->bi_iter.bi_sector < conf->reshape_progress))) { |
|
/* Need to update reshape_position in metadata */ |
|
mddev->reshape_position = conf->reshape_progress; |
|
set_mask_bits(&mddev->sb_flags, 0, |
|
BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); |
|
md_wakeup_thread(mddev->thread); |
|
raid10_log(conf->mddev, "wait reshape metadata"); |
|
wait_event(mddev->sb_wait, |
|
!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); |
|
|
|
conf->reshape_safe = mddev->reshape_position; |
|
} |
|
|
|
if (conf->pending_count >= max_queued_requests) { |
|
md_wakeup_thread(mddev->thread); |
|
raid10_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 to those blocks. This potentially requires several |
|
* writes to write around the bad blocks. Each set of writes |
|
* gets its own r10_bio with a set of bios attached. |
|
*/ |
|
|
|
r10_bio->read_slot = -1; /* make sure repl_bio gets freed */ |
|
raid10_find_phys(conf, r10_bio); |
|
|
|
wait_blocked_dev(mddev, r10_bio); |
|
|
|
rcu_read_lock(); |
|
max_sectors = r10_bio->sectors; |
|
|
|
for (i = 0; i < conf->copies; i++) { |
|
int d = r10_bio->devs[i].devnum; |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
struct md_rdev *rrdev = rcu_dereference( |
|
conf->mirrors[d].replacement); |
|
if (rdev == rrdev) |
|
rrdev = NULL; |
|
if (rdev && (test_bit(Faulty, &rdev->flags))) |
|
rdev = NULL; |
|
if (rrdev && (test_bit(Faulty, &rrdev->flags))) |
|
rrdev = NULL; |
|
|
|
r10_bio->devs[i].bio = NULL; |
|
r10_bio->devs[i].repl_bio = NULL; |
|
|
|
if (!rdev && !rrdev) { |
|
set_bit(R10BIO_Degraded, &r10_bio->state); |
|
continue; |
|
} |
|
if (rdev && test_bit(WriteErrorSeen, &rdev->flags)) { |
|
sector_t first_bad; |
|
sector_t dev_sector = r10_bio->devs[i].addr; |
|
int bad_sectors; |
|
int is_bad; |
|
|
|
is_bad = is_badblock(rdev, dev_sector, max_sectors, |
|
&first_bad, &bad_sectors); |
|
if (is_bad && first_bad <= dev_sector) { |
|
/* Cannot write here at all */ |
|
bad_sectors -= (dev_sector - first_bad); |
|
if (bad_sectors < max_sectors) |
|
/* Mustn't write more than bad_sectors |
|
* to other devices yet |
|
*/ |
|
max_sectors = bad_sectors; |
|
/* We don't set R10BIO_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 - dev_sector; |
|
if (good_sectors < max_sectors) |
|
max_sectors = good_sectors; |
|
} |
|
} |
|
if (rdev) { |
|
r10_bio->devs[i].bio = bio; |
|
atomic_inc(&rdev->nr_pending); |
|
} |
|
if (rrdev) { |
|
r10_bio->devs[i].repl_bio = bio; |
|
atomic_inc(&rrdev->nr_pending); |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
if (max_sectors < r10_bio->sectors) |
|
r10_bio->sectors = max_sectors; |
|
|
|
if (r10_bio->sectors < bio_sectors(bio)) { |
|
struct bio *split = bio_split(bio, r10_bio->sectors, |
|
GFP_NOIO, &conf->bio_split); |
|
bio_chain(split, bio); |
|
allow_barrier(conf); |
|
submit_bio_noacct(bio); |
|
wait_barrier(conf); |
|
bio = split; |
|
r10_bio->master_bio = bio; |
|
} |
|
|
|
if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) |
|
r10_bio->start_time = bio_start_io_acct(bio); |
|
atomic_set(&r10_bio->remaining, 1); |
|
md_bitmap_startwrite(mddev->bitmap, r10_bio->sector, r10_bio->sectors, 0); |
|
|
|
for (i = 0; i < conf->copies; i++) { |
|
if (r10_bio->devs[i].bio) |
|
raid10_write_one_disk(mddev, r10_bio, bio, false, i); |
|
if (r10_bio->devs[i].repl_bio) |
|
raid10_write_one_disk(mddev, r10_bio, bio, true, i); |
|
} |
|
one_write_done(r10_bio); |
|
} |
|
|
|
static void __make_request(struct mddev *mddev, struct bio *bio, int sectors) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
struct r10bio *r10_bio; |
|
|
|
r10_bio = mempool_alloc(&conf->r10bio_pool, GFP_NOIO); |
|
|
|
r10_bio->master_bio = bio; |
|
r10_bio->sectors = sectors; |
|
|
|
r10_bio->mddev = mddev; |
|
r10_bio->sector = bio->bi_iter.bi_sector; |
|
r10_bio->state = 0; |
|
r10_bio->read_slot = -1; |
|
memset(r10_bio->devs, 0, sizeof(r10_bio->devs[0]) * |
|
conf->geo.raid_disks); |
|
|
|
if (bio_data_dir(bio) == READ) |
|
raid10_read_request(mddev, bio, r10_bio); |
|
else |
|
raid10_write_request(mddev, bio, r10_bio); |
|
} |
|
|
|
static void raid_end_discard_bio(struct r10bio *r10bio) |
|
{ |
|
struct r10conf *conf = r10bio->mddev->private; |
|
struct r10bio *first_r10bio; |
|
|
|
while (atomic_dec_and_test(&r10bio->remaining)) { |
|
|
|
allow_barrier(conf); |
|
|
|
if (!test_bit(R10BIO_Discard, &r10bio->state)) { |
|
first_r10bio = (struct r10bio *)r10bio->master_bio; |
|
free_r10bio(r10bio); |
|
r10bio = first_r10bio; |
|
} else { |
|
md_write_end(r10bio->mddev); |
|
bio_endio(r10bio->master_bio); |
|
free_r10bio(r10bio); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
static void raid10_end_discard_request(struct bio *bio) |
|
{ |
|
struct r10bio *r10_bio = bio->bi_private; |
|
struct r10conf *conf = r10_bio->mddev->private; |
|
struct md_rdev *rdev = NULL; |
|
int dev; |
|
int slot, repl; |
|
|
|
/* |
|
* We don't care the return value of discard bio |
|
*/ |
|
if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) |
|
set_bit(R10BIO_Uptodate, &r10_bio->state); |
|
|
|
dev = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
|
if (repl) |
|
rdev = conf->mirrors[dev].replacement; |
|
if (!rdev) { |
|
/* |
|
* raid10_remove_disk uses smp_mb to make sure rdev is set to |
|
* replacement before setting replacement to NULL. It can read |
|
* rdev first without barrier protect even replacment is NULL |
|
*/ |
|
smp_rmb(); |
|
rdev = conf->mirrors[dev].rdev; |
|
} |
|
|
|
raid_end_discard_bio(r10_bio); |
|
rdev_dec_pending(rdev, conf->mddev); |
|
} |
|
|
|
/* |
|
* There are some limitations to handle discard bio |
|
* 1st, the discard size is bigger than stripe_size*2. |
|
* 2st, if the discard bio spans reshape progress, we use the old way to |
|
* handle discard bio |
|
*/ |
|
static int raid10_handle_discard(struct mddev *mddev, struct bio *bio) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
struct geom *geo = &conf->geo; |
|
int far_copies = geo->far_copies; |
|
bool first_copy = true; |
|
struct r10bio *r10_bio, *first_r10bio; |
|
struct bio *split; |
|
int disk; |
|
sector_t chunk; |
|
unsigned int stripe_size; |
|
unsigned int stripe_data_disks; |
|
sector_t split_size; |
|
sector_t bio_start, bio_end; |
|
sector_t first_stripe_index, last_stripe_index; |
|
sector_t start_disk_offset; |
|
unsigned int start_disk_index; |
|
sector_t end_disk_offset; |
|
unsigned int end_disk_index; |
|
unsigned int remainder; |
|
|
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
|
return -EAGAIN; |
|
|
|
wait_barrier(conf); |
|
|
|
/* |
|
* Check reshape again to avoid reshape happens after checking |
|
* MD_RECOVERY_RESHAPE and before wait_barrier |
|
*/ |
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
|
goto out; |
|
|
|
if (geo->near_copies) |
|
stripe_data_disks = geo->raid_disks / geo->near_copies + |
|
geo->raid_disks % geo->near_copies; |
|
else |
|
stripe_data_disks = geo->raid_disks; |
|
|
|
stripe_size = stripe_data_disks << geo->chunk_shift; |
|
|
|
bio_start = bio->bi_iter.bi_sector; |
|
bio_end = bio_end_sector(bio); |
|
|
|
/* |
|
* Maybe one discard bio is smaller than strip size or across one |
|
* stripe and discard region is larger than one stripe size. For far |
|
* offset layout, if the discard region is not aligned with stripe |
|
* size, there is hole when we submit discard bio to member disk. |
|
* For simplicity, we only handle discard bio which discard region |
|
* is bigger than stripe_size * 2 |
|
*/ |
|
if (bio_sectors(bio) < stripe_size*2) |
|
goto out; |
|
|
|
/* |
|
* Keep bio aligned with strip size. |
|
*/ |
|
div_u64_rem(bio_start, stripe_size, &remainder); |
|
if (remainder) { |
|
split_size = stripe_size - remainder; |
|
split = bio_split(bio, split_size, GFP_NOIO, &conf->bio_split); |
|
bio_chain(split, bio); |
|
allow_barrier(conf); |
|
/* Resend the fist split part */ |
|
submit_bio_noacct(split); |
|
wait_barrier(conf); |
|
} |
|
div_u64_rem(bio_end, stripe_size, &remainder); |
|
if (remainder) { |
|
split_size = bio_sectors(bio) - remainder; |
|
split = bio_split(bio, split_size, GFP_NOIO, &conf->bio_split); |
|
bio_chain(split, bio); |
|
allow_barrier(conf); |
|
/* Resend the second split part */ |
|
submit_bio_noacct(bio); |
|
bio = split; |
|
wait_barrier(conf); |
|
} |
|
|
|
bio_start = bio->bi_iter.bi_sector; |
|
bio_end = bio_end_sector(bio); |
|
|
|
/* |
|
* Raid10 uses chunk as the unit to store data. It's similar like raid0. |
|
* One stripe contains the chunks from all member disk (one chunk from |
|
* one disk at the same HBA address). For layout detail, see 'man md 4' |
|
*/ |
|
chunk = bio_start >> geo->chunk_shift; |
|
chunk *= geo->near_copies; |
|
first_stripe_index = chunk; |
|
start_disk_index = sector_div(first_stripe_index, geo->raid_disks); |
|
if (geo->far_offset) |
|
first_stripe_index *= geo->far_copies; |
|
start_disk_offset = (bio_start & geo->chunk_mask) + |
|
(first_stripe_index << geo->chunk_shift); |
|
|
|
chunk = bio_end >> geo->chunk_shift; |
|
chunk *= geo->near_copies; |
|
last_stripe_index = chunk; |
|
end_disk_index = sector_div(last_stripe_index, geo->raid_disks); |
|
if (geo->far_offset) |
|
last_stripe_index *= geo->far_copies; |
|
end_disk_offset = (bio_end & geo->chunk_mask) + |
|
(last_stripe_index << geo->chunk_shift); |
|
|
|
retry_discard: |
|
r10_bio = mempool_alloc(&conf->r10bio_pool, GFP_NOIO); |
|
r10_bio->mddev = mddev; |
|
r10_bio->state = 0; |
|
r10_bio->sectors = 0; |
|
memset(r10_bio->devs, 0, sizeof(r10_bio->devs[0]) * geo->raid_disks); |
|
wait_blocked_dev(mddev, r10_bio); |
|
|
|
/* |
|
* For far layout it needs more than one r10bio to cover all regions. |
|
* Inspired by raid10_sync_request, we can use the first r10bio->master_bio |
|
* to record the discard bio. Other r10bio->master_bio record the first |
|
* r10bio. The first r10bio only release after all other r10bios finish. |
|
* The discard bio returns only first r10bio finishes |
|
*/ |
|
if (first_copy) { |
|
r10_bio->master_bio = bio; |
|
set_bit(R10BIO_Discard, &r10_bio->state); |
|
first_copy = false; |
|
first_r10bio = r10_bio; |
|
} else |
|
r10_bio->master_bio = (struct bio *)first_r10bio; |
|
|
|
/* |
|
* first select target devices under rcu_lock and |
|
* inc refcount on their rdev. Record them by setting |
|
* bios[x] to bio |
|
*/ |
|
rcu_read_lock(); |
|
for (disk = 0; disk < geo->raid_disks; disk++) { |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[disk].rdev); |
|
struct md_rdev *rrdev = rcu_dereference( |
|
conf->mirrors[disk].replacement); |
|
|
|
r10_bio->devs[disk].bio = NULL; |
|
r10_bio->devs[disk].repl_bio = NULL; |
|
|
|
if (rdev && (test_bit(Faulty, &rdev->flags))) |
|
rdev = NULL; |
|
if (rrdev && (test_bit(Faulty, &rrdev->flags))) |
|
rrdev = NULL; |
|
if (!rdev && !rrdev) |
|
continue; |
|
|
|
if (rdev) { |
|
r10_bio->devs[disk].bio = bio; |
|
atomic_inc(&rdev->nr_pending); |
|
} |
|
if (rrdev) { |
|
r10_bio->devs[disk].repl_bio = bio; |
|
atomic_inc(&rrdev->nr_pending); |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
atomic_set(&r10_bio->remaining, 1); |
|
for (disk = 0; disk < geo->raid_disks; disk++) { |
|
sector_t dev_start, dev_end; |
|
struct bio *mbio, *rbio = NULL; |
|
|
|
/* |
|
* Now start to calculate the start and end address for each disk. |
|
* The space between dev_start and dev_end is the discard region. |
|
* |
|
* For dev_start, it needs to consider three conditions: |
|
* 1st, the disk is before start_disk, you can imagine the disk in |
|
* the next stripe. So the dev_start is the start address of next |
|
* stripe. |
|
* 2st, the disk is after start_disk, it means the disk is at the |
|
* same stripe of first disk |
|
* 3st, the first disk itself, we can use start_disk_offset directly |
|
*/ |
|
if (disk < start_disk_index) |
|
dev_start = (first_stripe_index + 1) * mddev->chunk_sectors; |
|
else if (disk > start_disk_index) |
|
dev_start = first_stripe_index * mddev->chunk_sectors; |
|
else |
|
dev_start = start_disk_offset; |
|
|
|
if (disk < end_disk_index) |
|
dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; |
|
else if (disk > end_disk_index) |
|
dev_end = last_stripe_index * mddev->chunk_sectors; |
|
else |
|
dev_end = end_disk_offset; |
|
|
|
/* |
|
* It only handles discard bio which size is >= stripe size, so |
|
* dev_end > dev_start all the time. |
|
* It doesn't need to use rcu lock to get rdev here. We already |
|
* add rdev->nr_pending in the first loop. |
|
*/ |
|
if (r10_bio->devs[disk].bio) { |
|
struct md_rdev *rdev = conf->mirrors[disk].rdev; |
|
mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); |
|
mbio->bi_end_io = raid10_end_discard_request; |
|
mbio->bi_private = r10_bio; |
|
r10_bio->devs[disk].bio = mbio; |
|
r10_bio->devs[disk].devnum = disk; |
|
atomic_inc(&r10_bio->remaining); |
|
md_submit_discard_bio(mddev, rdev, mbio, |
|
dev_start + choose_data_offset(r10_bio, rdev), |
|
dev_end - dev_start); |
|
bio_endio(mbio); |
|
} |
|
if (r10_bio->devs[disk].repl_bio) { |
|
struct md_rdev *rrdev = conf->mirrors[disk].replacement; |
|
rbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); |
|
rbio->bi_end_io = raid10_end_discard_request; |
|
rbio->bi_private = r10_bio; |
|
r10_bio->devs[disk].repl_bio = rbio; |
|
r10_bio->devs[disk].devnum = disk; |
|
atomic_inc(&r10_bio->remaining); |
|
md_submit_discard_bio(mddev, rrdev, rbio, |
|
dev_start + choose_data_offset(r10_bio, rrdev), |
|
dev_end - dev_start); |
|
bio_endio(rbio); |
|
} |
|
} |
|
|
|
if (!geo->far_offset && --far_copies) { |
|
first_stripe_index += geo->stride >> geo->chunk_shift; |
|
start_disk_offset += geo->stride; |
|
last_stripe_index += geo->stride >> geo->chunk_shift; |
|
end_disk_offset += geo->stride; |
|
atomic_inc(&first_r10bio->remaining); |
|
raid_end_discard_bio(r10_bio); |
|
wait_barrier(conf); |
|
goto retry_discard; |
|
} |
|
|
|
raid_end_discard_bio(r10_bio); |
|
|
|
return 0; |
|
out: |
|
allow_barrier(conf); |
|
return -EAGAIN; |
|
} |
|
|
|
static bool raid10_make_request(struct mddev *mddev, struct bio *bio) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
sector_t chunk_mask = (conf->geo.chunk_mask & conf->prev.chunk_mask); |
|
int chunk_sects = chunk_mask + 1; |
|
int sectors = bio_sectors(bio); |
|
|
|
if (unlikely(bio->bi_opf & REQ_PREFLUSH) |
|
&& md_flush_request(mddev, bio)) |
|
return true; |
|
|
|
if (!md_write_start(mddev, bio)) |
|
return false; |
|
|
|
if (unlikely(bio_op(bio) == REQ_OP_DISCARD)) |
|
if (!raid10_handle_discard(mddev, bio)) |
|
return true; |
|
|
|
/* |
|
* If this request crosses a chunk boundary, we need to split |
|
* it. |
|
*/ |
|
if (unlikely((bio->bi_iter.bi_sector & chunk_mask) + |
|
sectors > chunk_sects |
|
&& (conf->geo.near_copies < conf->geo.raid_disks |
|
|| conf->prev.near_copies < |
|
conf->prev.raid_disks))) |
|
sectors = chunk_sects - |
|
(bio->bi_iter.bi_sector & |
|
(chunk_sects - 1)); |
|
__make_request(mddev, bio, sectors); |
|
|
|
/* In case raid10d snuck in to freeze_array */ |
|
wake_up(&conf->wait_barrier); |
|
return true; |
|
} |
|
|
|
static void raid10_status(struct seq_file *seq, struct mddev *mddev) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
int i; |
|
|
|
if (conf->geo.near_copies < conf->geo.raid_disks) |
|
seq_printf(seq, " %dK chunks", mddev->chunk_sectors / 2); |
|
if (conf->geo.near_copies > 1) |
|
seq_printf(seq, " %d near-copies", conf->geo.near_copies); |
|
if (conf->geo.far_copies > 1) { |
|
if (conf->geo.far_offset) |
|
seq_printf(seq, " %d offset-copies", conf->geo.far_copies); |
|
else |
|
seq_printf(seq, " %d far-copies", conf->geo.far_copies); |
|
if (conf->geo.far_set_size != conf->geo.raid_disks) |
|
seq_printf(seq, " %d devices per set", conf->geo.far_set_size); |
|
} |
|
seq_printf(seq, " [%d/%d] [", conf->geo.raid_disks, |
|
conf->geo.raid_disks - mddev->degraded); |
|
rcu_read_lock(); |
|
for (i = 0; i < conf->geo.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, "]"); |
|
} |
|
|
|
/* check if there are enough drives for |
|
* every block to appear on atleast one. |
|
* Don't consider the device numbered 'ignore' |
|
* as we might be about to remove it. |
|
*/ |
|
static int _enough(struct r10conf *conf, int previous, int ignore) |
|
{ |
|
int first = 0; |
|
int has_enough = 0; |
|
int disks, ncopies; |
|
if (previous) { |
|
disks = conf->prev.raid_disks; |
|
ncopies = conf->prev.near_copies; |
|
} else { |
|
disks = conf->geo.raid_disks; |
|
ncopies = conf->geo.near_copies; |
|
} |
|
|
|
rcu_read_lock(); |
|
do { |
|
int n = conf->copies; |
|
int cnt = 0; |
|
int this = first; |
|
while (n--) { |
|
struct md_rdev *rdev; |
|
if (this != ignore && |
|
(rdev = rcu_dereference(conf->mirrors[this].rdev)) && |
|
test_bit(In_sync, &rdev->flags)) |
|
cnt++; |
|
this = (this+1) % disks; |
|
} |
|
if (cnt == 0) |
|
goto out; |
|
first = (first + ncopies) % disks; |
|
} while (first != 0); |
|
has_enough = 1; |
|
out: |
|
rcu_read_unlock(); |
|
return has_enough; |
|
} |
|
|
|
static int enough(struct r10conf *conf, int ignore) |
|
{ |
|
/* when calling 'enough', both 'prev' and 'geo' must |
|
* be stable. |
|
* This is ensured if ->reconfig_mutex or ->device_lock |
|
* is held. |
|
*/ |
|
return _enough(conf, 0, ignore) && |
|
_enough(conf, 1, ignore); |
|
} |
|
|
|
static void raid10_error(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
char b[BDEVNAME_SIZE]; |
|
struct r10conf *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 |
|
&& !enough(conf, rdev->raid_disk)) { |
|
/* |
|
* Don't fail the drive, just return an IO error. |
|
*/ |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
return; |
|
} |
|
if (test_and_clear_bit(In_sync, &rdev->flags)) |
|
mddev->degraded++; |
|
/* |
|
* If recovery is running, make sure it aborts. |
|
*/ |
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
|
set_bit(Blocked, &rdev->flags); |
|
set_bit(Faulty, &rdev->flags); |
|
set_mask_bits(&mddev->sb_flags, 0, |
|
BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
pr_crit("md/raid10:%s: Disk failure on %s, disabling device.\n" |
|
"md/raid10:%s: Operation continuing on %d devices.\n", |
|
mdname(mddev), bdevname(rdev->bdev, b), |
|
mdname(mddev), conf->geo.raid_disks - mddev->degraded); |
|
} |
|
|
|
static void print_conf(struct r10conf *conf) |
|
{ |
|
int i; |
|
struct md_rdev *rdev; |
|
|
|
pr_debug("RAID10 conf printout:\n"); |
|
if (!conf) { |
|
pr_debug("(!conf)\n"); |
|
return; |
|
} |
|
pr_debug(" --- wd:%d rd:%d\n", conf->geo.raid_disks - conf->mddev->degraded, |
|
conf->geo.raid_disks); |
|
|
|
/* This is only called with ->reconfix_mutex held, so |
|
* rcu protection of rdev is not needed */ |
|
for (i = 0; i < conf->geo.raid_disks; i++) { |
|
char b[BDEVNAME_SIZE]; |
|
rdev = 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)); |
|
} |
|
} |
|
|
|
static void close_sync(struct r10conf *conf) |
|
{ |
|
wait_barrier(conf); |
|
allow_barrier(conf); |
|
|
|
mempool_exit(&conf->r10buf_pool); |
|
} |
|
|
|
static int raid10_spare_active(struct mddev *mddev) |
|
{ |
|
int i; |
|
struct r10conf *conf = mddev->private; |
|
struct raid10_info *tmp; |
|
int count = 0; |
|
unsigned long flags; |
|
|
|
/* |
|
* Find all non-in_sync disks within the RAID10 configuration |
|
* and mark them in_sync |
|
*/ |
|
for (i = 0; i < conf->geo.raid_disks; i++) { |
|
tmp = conf->mirrors + i; |
|
if (tmp->replacement |
|
&& tmp->replacement->recovery_offset == MaxSector |
|
&& !test_bit(Faulty, &tmp->replacement->flags) |
|
&& !test_and_set_bit(In_sync, &tmp->replacement->flags)) { |
|
/* Replacement has just become active */ |
|
if (!tmp->rdev |
|
|| !test_and_clear_bit(In_sync, &tmp->rdev->flags)) |
|
count++; |
|
if (tmp->rdev) { |
|
/* Replaced device not technically faulty, |
|
* but we need to be sure it gets removed |
|
* and never re-added. |
|
*/ |
|
set_bit(Faulty, &tmp->rdev->flags); |
|
sysfs_notify_dirent_safe( |
|
tmp->rdev->sysfs_state); |
|
} |
|
sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); |
|
} else if (tmp->rdev |
|
&& tmp->rdev->recovery_offset == MaxSector |
|
&& !test_bit(Faulty, &tmp->rdev->flags) |
|
&& !test_and_set_bit(In_sync, &tmp->rdev->flags)) { |
|
count++; |
|
sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
|
} |
|
} |
|
spin_lock_irqsave(&conf->device_lock, flags); |
|
mddev->degraded -= count; |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
|
|
print_conf(conf); |
|
return count; |
|
} |
|
|
|
static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
int err = -EEXIST; |
|
int mirror; |
|
int first = 0; |
|
int last = conf->geo.raid_disks - 1; |
|
|
|
if (mddev->recovery_cp < MaxSector) |
|
/* only hot-add to in-sync arrays, as recovery is |
|
* very different from resync |
|
*/ |
|
return -EBUSY; |
|
if (rdev->saved_raid_disk < 0 && !_enough(conf, 1, -1)) |
|
return -EINVAL; |
|
|
|
if (md_integrity_add_rdev(rdev, mddev)) |
|
return -ENXIO; |
|
|
|
if (rdev->raid_disk >= 0) |
|
first = last = rdev->raid_disk; |
|
|
|
if (rdev->saved_raid_disk >= first && |
|
rdev->saved_raid_disk < conf->geo.raid_disks && |
|
conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
|
mirror = rdev->saved_raid_disk; |
|
else |
|
mirror = first; |
|
for ( ; mirror <= last ; mirror++) { |
|
struct raid10_info *p = &conf->mirrors[mirror]; |
|
if (p->recovery_disabled == mddev->recovery_disabled) |
|
continue; |
|
if (p->rdev) { |
|
if (!test_bit(WantReplacement, &p->rdev->flags) || |
|
p->replacement != NULL) |
|
continue; |
|
clear_bit(In_sync, &rdev->flags); |
|
set_bit(Replacement, &rdev->flags); |
|
rdev->raid_disk = mirror; |
|
err = 0; |
|
if (mddev->gendisk) |
|
disk_stack_limits(mddev->gendisk, rdev->bdev, |
|
rdev->data_offset << 9); |
|
conf->fullsync = 1; |
|
rcu_assign_pointer(p->replacement, rdev); |
|
break; |
|
} |
|
|
|
if (mddev->gendisk) |
|
disk_stack_limits(mddev->gendisk, rdev->bdev, |
|
rdev->data_offset << 9); |
|
|
|
p->head_position = 0; |
|
p->recovery_disabled = mddev->recovery_disabled - 1; |
|
rdev->raid_disk = mirror; |
|
err = 0; |
|
if (rdev->saved_raid_disk != mirror) |
|
conf->fullsync = 1; |
|
rcu_assign_pointer(p->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 raid10_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
int err = 0; |
|
int number = rdev->raid_disk; |
|
struct md_rdev **rdevp; |
|
struct raid10_info *p = conf->mirrors + number; |
|
|
|
print_conf(conf); |
|
if (rdev == p->rdev) |
|
rdevp = &p->rdev; |
|
else if (rdev == p->replacement) |
|
rdevp = &p->replacement; |
|
else |
|
return 0; |
|
|
|
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 != p->recovery_disabled && |
|
(!p->replacement || p->replacement == rdev) && |
|
number < conf->geo.raid_disks && |
|
enough(conf, -1)) { |
|
err = -EBUSY; |
|
goto abort; |
|
} |
|
*rdevp = NULL; |
|
if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
|
synchronize_rcu(); |
|
if (atomic_read(&rdev->nr_pending)) { |
|
/* lost the race, try later */ |
|
err = -EBUSY; |
|
*rdevp = rdev; |
|
goto abort; |
|
} |
|
} |
|
if (p->replacement) { |
|
/* We must have just cleared 'rdev' */ |
|
p->rdev = p->replacement; |
|
clear_bit(Replacement, &p->replacement->flags); |
|
smp_mb(); /* Make sure other CPUs may see both as identical |
|
* but will never see neither -- if they are careful. |
|
*/ |
|
p->replacement = NULL; |
|
} |
|
|
|
clear_bit(WantReplacement, &rdev->flags); |
|
err = md_integrity_register(mddev); |
|
|
|
abort: |
|
|
|
print_conf(conf); |
|
return err; |
|
} |
|
|
|
static void __end_sync_read(struct r10bio *r10_bio, struct bio *bio, int d) |
|
{ |
|
struct r10conf *conf = r10_bio->mddev->private; |
|
|
|
if (!bio->bi_status) |
|
set_bit(R10BIO_Uptodate, &r10_bio->state); |
|
else |
|
/* The write handler will notice the lack of |
|
* R10BIO_Uptodate and record any errors etc |
|
*/ |
|
atomic_add(r10_bio->sectors, |
|
&conf->mirrors[d].rdev->corrected_errors); |
|
|
|
/* for reconstruct, we always reschedule after a read. |
|
* for resync, only after all reads |
|
*/ |
|
rdev_dec_pending(conf->mirrors[d].rdev, conf->mddev); |
|
if (test_bit(R10BIO_IsRecover, &r10_bio->state) || |
|
atomic_dec_and_test(&r10_bio->remaining)) { |
|
/* we have read all the blocks, |
|
* do the comparison in process context in raid10d |
|
*/ |
|
reschedule_retry(r10_bio); |
|
} |
|
} |
|
|
|
static void end_sync_read(struct bio *bio) |
|
{ |
|
struct r10bio *r10_bio = get_resync_r10bio(bio); |
|
struct r10conf *conf = r10_bio->mddev->private; |
|
int d = find_bio_disk(conf, r10_bio, bio, NULL, NULL); |
|
|
|
__end_sync_read(r10_bio, bio, d); |
|
} |
|
|
|
static void end_reshape_read(struct bio *bio) |
|
{ |
|
/* reshape read bio isn't allocated from r10buf_pool */ |
|
struct r10bio *r10_bio = bio->bi_private; |
|
|
|
__end_sync_read(r10_bio, bio, r10_bio->read_slot); |
|
} |
|
|
|
static void end_sync_request(struct r10bio *r10_bio) |
|
{ |
|
struct mddev *mddev = r10_bio->mddev; |
|
|
|
while (atomic_dec_and_test(&r10_bio->remaining)) { |
|
if (r10_bio->master_bio == NULL) { |
|
/* the primary of several recovery bios */ |
|
sector_t s = r10_bio->sectors; |
|
if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
|
test_bit(R10BIO_WriteError, &r10_bio->state)) |
|
reschedule_retry(r10_bio); |
|
else |
|
put_buf(r10_bio); |
|
md_done_sync(mddev, s, 1); |
|
break; |
|
} else { |
|
struct r10bio *r10_bio2 = (struct r10bio *)r10_bio->master_bio; |
|
if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
|
test_bit(R10BIO_WriteError, &r10_bio->state)) |
|
reschedule_retry(r10_bio); |
|
else |
|
put_buf(r10_bio); |
|
r10_bio = r10_bio2; |
|
} |
|
} |
|
} |
|
|
|
static void end_sync_write(struct bio *bio) |
|
{ |
|
struct r10bio *r10_bio = get_resync_r10bio(bio); |
|
struct mddev *mddev = r10_bio->mddev; |
|
struct r10conf *conf = mddev->private; |
|
int d; |
|
sector_t first_bad; |
|
int bad_sectors; |
|
int slot; |
|
int repl; |
|
struct md_rdev *rdev = NULL; |
|
|
|
d = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
|
if (repl) |
|
rdev = conf->mirrors[d].replacement; |
|
else |
|
rdev = conf->mirrors[d].rdev; |
|
|
|
if (bio->bi_status) { |
|
if (repl) |
|
md_error(mddev, rdev); |
|
else { |
|
set_bit(WriteErrorSeen, &rdev->flags); |
|
if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
|
set_bit(MD_RECOVERY_NEEDED, |
|
&rdev->mddev->recovery); |
|
set_bit(R10BIO_WriteError, &r10_bio->state); |
|
} |
|
} else if (is_badblock(rdev, |
|
r10_bio->devs[slot].addr, |
|
r10_bio->sectors, |
|
&first_bad, &bad_sectors)) |
|
set_bit(R10BIO_MadeGood, &r10_bio->state); |
|
|
|
rdev_dec_pending(rdev, mddev); |
|
|
|
end_sync_request(r10_bio); |
|
} |
|
|
|
/* |
|
* Note: sync and recover and handled very differently for raid10 |
|
* This code is for resync. |
|
* For resync, we read through virtual addresses and read all blocks. |
|
* If there is any error, we schedule a write. The lowest numbered |
|
* drive is authoritative. |
|
* However requests come for physical address, so we need to map. |
|
* For every physical address there are raid_disks/copies virtual addresses, |
|
* which is always are least one, but is not necessarly an integer. |
|
* This means that a physical address can span multiple chunks, so we may |
|
* have to submit multiple io requests for a single sync request. |
|
*/ |
|
/* |
|
* We check if all blocks are in-sync and only write to blocks that |
|
* aren't in sync |
|
*/ |
|
static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
int i, first; |
|
struct bio *tbio, *fbio; |
|
int vcnt; |
|
struct page **tpages, **fpages; |
|
|
|
atomic_set(&r10_bio->remaining, 1); |
|
|
|
/* find the first device with a block */ |
|
for (i=0; i<conf->copies; i++) |
|
if (!r10_bio->devs[i].bio->bi_status) |
|
break; |
|
|
|
if (i == conf->copies) |
|
goto done; |
|
|
|
first = i; |
|
fbio = r10_bio->devs[i].bio; |
|
fbio->bi_iter.bi_size = r10_bio->sectors << 9; |
|
fbio->bi_iter.bi_idx = 0; |
|
fpages = get_resync_pages(fbio)->pages; |
|
|
|
vcnt = (r10_bio->sectors + (PAGE_SIZE >> 9) - 1) >> (PAGE_SHIFT - 9); |
|
/* now find blocks with errors */ |
|
for (i=0 ; i < conf->copies ; i++) { |
|
int j, d; |
|
struct md_rdev *rdev; |
|
struct resync_pages *rp; |
|
|
|
tbio = r10_bio->devs[i].bio; |
|
|
|
if (tbio->bi_end_io != end_sync_read) |
|
continue; |
|
if (i == first) |
|
continue; |
|
|
|
tpages = get_resync_pages(tbio)->pages; |
|
d = r10_bio->devs[i].devnum; |
|
rdev = conf->mirrors[d].rdev; |
|
if (!r10_bio->devs[i].bio->bi_status) { |
|
/* We know that the bi_io_vec layout is the same for |
|
* both 'first' and 'i', so we just compare them. |
|
* All vec entries are PAGE_SIZE; |
|
*/ |
|
int sectors = r10_bio->sectors; |
|
for (j = 0; j < vcnt; j++) { |
|
int len = PAGE_SIZE; |
|
if (sectors < (len / 512)) |
|
len = sectors * 512; |
|
if (memcmp(page_address(fpages[j]), |
|
page_address(tpages[j]), |
|
len)) |
|
break; |
|
sectors -= len/512; |
|
} |
|
if (j == vcnt) |
|
continue; |
|
atomic64_add(r10_bio->sectors, &mddev->resync_mismatches); |
|
if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
|
/* Don't fix anything. */ |
|
continue; |
|
} else if (test_bit(FailFast, &rdev->flags)) { |
|
/* Just give up on this device */ |
|
md_error(rdev->mddev, rdev); |
|
continue; |
|
} |
|
/* Ok, we need to write this bio, either to correct an |
|
* inconsistency or to correct an unreadable block. |
|
* First we need to fixup bv_offset, bv_len and |
|
* bi_vecs, as the read request might have corrupted these |
|
*/ |
|
rp = get_resync_pages(tbio); |
|
bio_reset(tbio); |
|
|
|
md_bio_reset_resync_pages(tbio, rp, fbio->bi_iter.bi_size); |
|
|
|
rp->raid_bio = r10_bio; |
|
tbio->bi_private = rp; |
|
tbio->bi_iter.bi_sector = r10_bio->devs[i].addr; |
|
tbio->bi_end_io = end_sync_write; |
|
bio_set_op_attrs(tbio, REQ_OP_WRITE, 0); |
|
|
|
bio_copy_data(tbio, fbio); |
|
|
|
atomic_inc(&conf->mirrors[d].rdev->nr_pending); |
|
atomic_inc(&r10_bio->remaining); |
|
md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(tbio)); |
|
|
|
if (test_bit(FailFast, &conf->mirrors[d].rdev->flags)) |
|
tbio->bi_opf |= MD_FAILFAST; |
|
tbio->bi_iter.bi_sector += conf->mirrors[d].rdev->data_offset; |
|
bio_set_dev(tbio, conf->mirrors[d].rdev->bdev); |
|
submit_bio_noacct(tbio); |
|
} |
|
|
|
/* Now write out to any replacement devices |
|
* that are active |
|
*/ |
|
for (i = 0; i < conf->copies; i++) { |
|
int d; |
|
|
|
tbio = r10_bio->devs[i].repl_bio; |
|
if (!tbio || !tbio->bi_end_io) |
|
continue; |
|
if (r10_bio->devs[i].bio->bi_end_io != end_sync_write |
|
&& r10_bio->devs[i].bio != fbio) |
|
bio_copy_data(tbio, fbio); |
|
d = r10_bio->devs[i].devnum; |
|
atomic_inc(&r10_bio->remaining); |
|
md_sync_acct(conf->mirrors[d].replacement->bdev, |
|
bio_sectors(tbio)); |
|
submit_bio_noacct(tbio); |
|
} |
|
|
|
done: |
|
if (atomic_dec_and_test(&r10_bio->remaining)) { |
|
md_done_sync(mddev, r10_bio->sectors, 1); |
|
put_buf(r10_bio); |
|
} |
|
} |
|
|
|
/* |
|
* Now for the recovery code. |
|
* Recovery happens across physical sectors. |
|
* We recover all non-is_sync drives by finding the virtual address of |
|
* each, and then choose a working drive that also has that virt address. |
|
* There is a separate r10_bio for each non-in_sync drive. |
|
* Only the first two slots are in use. The first for reading, |
|
* The second for writing. |
|
* |
|
*/ |
|
static void fix_recovery_read_error(struct r10bio *r10_bio) |
|
{ |
|
/* We got a read error during recovery. |
|
* We repeat the read in smaller page-sized sections. |
|
* If a read succeeds, write it to the new device or record |
|
* a bad block if we cannot. |
|
* If a read fails, record a bad block on both old and |
|
* new devices. |
|
*/ |
|
struct mddev *mddev = r10_bio->mddev; |
|
struct r10conf *conf = mddev->private; |
|
struct bio *bio = r10_bio->devs[0].bio; |
|
sector_t sect = 0; |
|
int sectors = r10_bio->sectors; |
|
int idx = 0; |
|
int dr = r10_bio->devs[0].devnum; |
|
int dw = r10_bio->devs[1].devnum; |
|
struct page **pages = get_resync_pages(bio)->pages; |
|
|
|
while (sectors) { |
|
int s = sectors; |
|
struct md_rdev *rdev; |
|
sector_t addr; |
|
int ok; |
|
|
|
if (s > (PAGE_SIZE>>9)) |
|
s = PAGE_SIZE >> 9; |
|
|
|
rdev = conf->mirrors[dr].rdev; |
|
addr = r10_bio->devs[0].addr + sect, |
|
ok = sync_page_io(rdev, |
|
addr, |
|
s << 9, |
|
pages[idx], |
|
REQ_OP_READ, 0, false); |
|
if (ok) { |
|
rdev = conf->mirrors[dw].rdev; |
|
addr = r10_bio->devs[1].addr + sect; |
|
ok = sync_page_io(rdev, |
|
addr, |
|
s << 9, |
|
pages[idx], |
|
REQ_OP_WRITE, 0, false); |
|
if (!ok) { |
|
set_bit(WriteErrorSeen, &rdev->flags); |
|
if (!test_and_set_bit(WantReplacement, |
|
&rdev->flags)) |
|
set_bit(MD_RECOVERY_NEEDED, |
|
&rdev->mddev->recovery); |
|
} |
|
} |
|
if (!ok) { |
|
/* We don't worry if we cannot set a bad block - |
|
* it really is bad so there is no loss in not |
|
* recording it yet |
|
*/ |
|
rdev_set_badblocks(rdev, addr, s, 0); |
|
|
|
if (rdev != conf->mirrors[dw].rdev) { |
|
/* need bad block on destination too */ |
|
struct md_rdev *rdev2 = conf->mirrors[dw].rdev; |
|
addr = r10_bio->devs[1].addr + sect; |
|
ok = rdev_set_badblocks(rdev2, addr, s, 0); |
|
if (!ok) { |
|
/* just abort the recovery */ |
|
pr_notice("md/raid10:%s: recovery aborted due to read error\n", |
|
mdname(mddev)); |
|
|
|
conf->mirrors[dw].recovery_disabled |
|
= mddev->recovery_disabled; |
|
set_bit(MD_RECOVERY_INTR, |
|
&mddev->recovery); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
sectors -= s; |
|
sect += s; |
|
idx++; |
|
} |
|
} |
|
|
|
static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
int d; |
|
struct bio *wbio, *wbio2; |
|
|
|
if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) { |
|
fix_recovery_read_error(r10_bio); |
|
end_sync_request(r10_bio); |
|
return; |
|
} |
|
|
|
/* |
|
* share the pages with the first bio |
|
* and submit the write request |
|
*/ |
|
d = r10_bio->devs[1].devnum; |
|
wbio = r10_bio->devs[1].bio; |
|
wbio2 = r10_bio->devs[1].repl_bio; |
|
/* Need to test wbio2->bi_end_io before we call |
|
* submit_bio_noacct as if the former is NULL, |
|
* the latter is free to free wbio2. |
|
*/ |
|
if (wbio2 && !wbio2->bi_end_io) |
|
wbio2 = NULL; |
|
if (wbio->bi_end_io) { |
|
atomic_inc(&conf->mirrors[d].rdev->nr_pending); |
|
md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(wbio)); |
|
submit_bio_noacct(wbio); |
|
} |
|
if (wbio2) { |
|
atomic_inc(&conf->mirrors[d].replacement->nr_pending); |
|
md_sync_acct(conf->mirrors[d].replacement->bdev, |
|
bio_sectors(wbio2)); |
|
submit_bio_noacct(wbio2); |
|
} |
|
} |
|
|
|
/* |
|
* Used by fix_read_error() to decay the per rdev read_errors. |
|
* We halve the read error count for every hour that has elapsed |
|
* since the last recorded read error. |
|
* |
|
*/ |
|
static void check_decay_read_errors(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
long cur_time_mon; |
|
unsigned long hours_since_last; |
|
unsigned int read_errors = atomic_read(&rdev->read_errors); |
|
|
|
cur_time_mon = ktime_get_seconds(); |
|
|
|
if (rdev->last_read_error == 0) { |
|
/* first time we've seen a read error */ |
|
rdev->last_read_error = cur_time_mon; |
|
return; |
|
} |
|
|
|
hours_since_last = (long)(cur_time_mon - |
|
rdev->last_read_error) / 3600; |
|
|
|
rdev->last_read_error = cur_time_mon; |
|
|
|
/* |
|
* if hours_since_last is > the number of bits in read_errors |
|
* just set read errors to 0. We do this to avoid |
|
* overflowing the shift of read_errors by hours_since_last. |
|
*/ |
|
if (hours_since_last >= 8 * sizeof(read_errors)) |
|
atomic_set(&rdev->read_errors, 0); |
|
else |
|
atomic_set(&rdev->read_errors, read_errors >> hours_since_last); |
|
} |
|
|
|
static int r10_sync_page_io(struct md_rdev *rdev, sector_t sector, |
|
int sectors, struct page *page, int rw) |
|
{ |
|
sector_t first_bad; |
|
int bad_sectors; |
|
|
|
if (is_badblock(rdev, sector, sectors, &first_bad, &bad_sectors) |
|
&& (rw == READ || test_bit(WriteErrorSeen, &rdev->flags))) |
|
return -1; |
|
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; |
|
} |
|
|
|
/* |
|
* 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 r10conf *conf, struct mddev *mddev, struct r10bio *r10_bio) |
|
{ |
|
int sect = 0; /* Offset from r10_bio->sector */ |
|
int sectors = r10_bio->sectors; |
|
struct md_rdev *rdev; |
|
int max_read_errors = atomic_read(&mddev->max_corr_read_errors); |
|
int d = r10_bio->devs[r10_bio->read_slot].devnum; |
|
|
|
/* still own a reference to this rdev, so it cannot |
|
* have been cleared recently. |
|
*/ |
|
rdev = conf->mirrors[d].rdev; |
|
|
|
if (test_bit(Faulty, &rdev->flags)) |
|
/* drive has already been failed, just ignore any |
|
more fix_read_error() attempts */ |
|
return; |
|
|
|
check_decay_read_errors(mddev, rdev); |
|
atomic_inc(&rdev->read_errors); |
|
if (atomic_read(&rdev->read_errors) > max_read_errors) { |
|
char b[BDEVNAME_SIZE]; |
|
bdevname(rdev->bdev, b); |
|
|
|
pr_notice("md/raid10:%s: %s: Raid device exceeded read_error threshold [cur %d:max %d]\n", |
|
mdname(mddev), b, |
|
atomic_read(&rdev->read_errors), max_read_errors); |
|
pr_notice("md/raid10:%s: %s: Failing raid device\n", |
|
mdname(mddev), b); |
|
md_error(mddev, rdev); |
|
r10_bio->devs[r10_bio->read_slot].bio = IO_BLOCKED; |
|
return; |
|
} |
|
|
|
while(sectors) { |
|
int s = sectors; |
|
int sl = r10_bio->read_slot; |
|
int success = 0; |
|
int start; |
|
|
|
if (s > (PAGE_SIZE>>9)) |
|
s = PAGE_SIZE >> 9; |
|
|
|
rcu_read_lock(); |
|
do { |
|
sector_t first_bad; |
|
int bad_sectors; |
|
|
|
d = r10_bio->devs[sl].devnum; |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (rdev && |
|
test_bit(In_sync, &rdev->flags) && |
|
!test_bit(Faulty, &rdev->flags) && |
|
is_badblock(rdev, r10_bio->devs[sl].addr + sect, s, |
|
&first_bad, &bad_sectors) == 0) { |
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
success = sync_page_io(rdev, |
|
r10_bio->devs[sl].addr + |
|
sect, |
|
s<<9, |
|
conf->tmppage, |
|
REQ_OP_READ, 0, false); |
|
rdev_dec_pending(rdev, mddev); |
|
rcu_read_lock(); |
|
if (success) |
|
break; |
|
} |
|
sl++; |
|
if (sl == conf->copies) |
|
sl = 0; |
|
} while (!success && sl != r10_bio->read_slot); |
|
rcu_read_unlock(); |
|
|
|
if (!success) { |
|
/* Cannot read from anywhere, just mark the block |
|
* as bad on the first device to discourage future |
|
* reads. |
|
*/ |
|
int dn = r10_bio->devs[r10_bio->read_slot].devnum; |
|
rdev = conf->mirrors[dn].rdev; |
|
|
|
if (!rdev_set_badblocks( |
|
rdev, |
|
r10_bio->devs[r10_bio->read_slot].addr |
|
+ sect, |
|
s, 0)) { |
|
md_error(mddev, rdev); |
|
r10_bio->devs[r10_bio->read_slot].bio |
|
= IO_BLOCKED; |
|
} |
|
break; |
|
} |
|
|
|
start = sl; |
|
/* write it back and re-read */ |
|
rcu_read_lock(); |
|
while (sl != r10_bio->read_slot) { |
|
char b[BDEVNAME_SIZE]; |
|
|
|
if (sl==0) |
|
sl = conf->copies; |
|
sl--; |
|
d = r10_bio->devs[sl].devnum; |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (!rdev || |
|
test_bit(Faulty, &rdev->flags) || |
|
!test_bit(In_sync, &rdev->flags)) |
|
continue; |
|
|
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
if (r10_sync_page_io(rdev, |
|
r10_bio->devs[sl].addr + |
|
sect, |
|
s, conf->tmppage, WRITE) |
|
== 0) { |
|
/* Well, this device is dead */ |
|
pr_notice("md/raid10:%s: read correction write failed (%d sectors at %llu on %s)\n", |
|
mdname(mddev), s, |
|
(unsigned long long)( |
|
sect + |
|
choose_data_offset(r10_bio, |
|
rdev)), |
|
bdevname(rdev->bdev, b)); |
|
pr_notice("md/raid10:%s: %s: failing drive\n", |
|
mdname(mddev), |
|
bdevname(rdev->bdev, b)); |
|
} |
|
rdev_dec_pending(rdev, mddev); |
|
rcu_read_lock(); |
|
} |
|
sl = start; |
|
while (sl != r10_bio->read_slot) { |
|
char b[BDEVNAME_SIZE]; |
|
|
|
if (sl==0) |
|
sl = conf->copies; |
|
sl--; |
|
d = r10_bio->devs[sl].devnum; |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (!rdev || |
|
test_bit(Faulty, &rdev->flags) || |
|
!test_bit(In_sync, &rdev->flags)) |
|
continue; |
|
|
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
switch (r10_sync_page_io(rdev, |
|
r10_bio->devs[sl].addr + |
|
sect, |
|
s, conf->tmppage, |
|
READ)) { |
|
case 0: |
|
/* Well, this device is dead */ |
|
pr_notice("md/raid10:%s: unable to read back corrected sectors (%d sectors at %llu on %s)\n", |
|
mdname(mddev), s, |
|
(unsigned long long)( |
|
sect + |
|
choose_data_offset(r10_bio, rdev)), |
|
bdevname(rdev->bdev, b)); |
|
pr_notice("md/raid10:%s: %s: failing drive\n", |
|
mdname(mddev), |
|
bdevname(rdev->bdev, b)); |
|
break; |
|
case 1: |
|
pr_info("md/raid10:%s: read error corrected (%d sectors at %llu on %s)\n", |
|
mdname(mddev), s, |
|
(unsigned long long)( |
|
sect + |
|
choose_data_offset(r10_bio, rdev)), |
|
bdevname(rdev->bdev, b)); |
|
atomic_add(s, &rdev->corrected_errors); |
|
} |
|
|
|
rdev_dec_pending(rdev, mddev); |
|
rcu_read_lock(); |
|
} |
|
rcu_read_unlock(); |
|
|
|
sectors -= s; |
|
sect += s; |
|
} |
|
} |
|
|
|
static int narrow_write_error(struct r10bio *r10_bio, int i) |
|
{ |
|
struct bio *bio = r10_bio->master_bio; |
|
struct mddev *mddev = r10_bio->mddev; |
|
struct r10conf *conf = mddev->private; |
|
struct md_rdev *rdev = conf->mirrors[r10_bio->devs[i].devnum].rdev; |
|
/* bio has the data to be written to slot '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. |
|
* |
|
* We currently own a reference to the rdev. |
|
*/ |
|
|
|
int block_sectors; |
|
sector_t sector; |
|
int sectors; |
|
int sect_to_write = r10_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 = r10_bio->sector; |
|
sectors = ((r10_bio->sector + block_sectors) |
|
& ~(sector_t)(block_sectors - 1)) |
|
- sector; |
|
|
|
while (sect_to_write) { |
|
struct bio *wbio; |
|
sector_t wsector; |
|
if (sectors > sect_to_write) |
|
sectors = sect_to_write; |
|
/* Write at 'sector' for 'sectors' */ |
|
wbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); |
|
bio_trim(wbio, sector - bio->bi_iter.bi_sector, sectors); |
|
wsector = r10_bio->devs[i].addr + (sector - r10_bio->sector); |
|
wbio->bi_iter.bi_sector = wsector + |
|
choose_data_offset(r10_bio, rdev); |
|
bio_set_dev(wbio, rdev->bdev); |
|
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
|
|
|
if (submit_bio_wait(wbio) < 0) |
|
/* Failure! */ |
|
ok = rdev_set_badblocks(rdev, wsector, |
|
sectors, 0) |
|
&& ok; |
|
|
|
bio_put(wbio); |
|
sect_to_write -= sectors; |
|
sector += sectors; |
|
sectors = block_sectors; |
|
} |
|
return ok; |
|
} |
|
|
|
static void handle_read_error(struct mddev *mddev, struct r10bio *r10_bio) |
|
{ |
|
int slot = r10_bio->read_slot; |
|
struct bio *bio; |
|
struct r10conf *conf = mddev->private; |
|
struct md_rdev *rdev = r10_bio->devs[slot].rdev; |
|
|
|
/* 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 = r10_bio->devs[slot].bio; |
|
bio_put(bio); |
|
r10_bio->devs[slot].bio = NULL; |
|
|
|
if (mddev->ro) |
|
r10_bio->devs[slot].bio = IO_BLOCKED; |
|
else if (!test_bit(FailFast, &rdev->flags)) { |
|
freeze_array(conf, 1); |
|
fix_read_error(conf, mddev, r10_bio); |
|
unfreeze_array(conf); |
|
} else |
|
md_error(mddev, rdev); |
|
|
|
rdev_dec_pending(rdev, mddev); |
|
allow_barrier(conf); |
|
r10_bio->state = 0; |
|
raid10_read_request(mddev, r10_bio->master_bio, r10_bio); |
|
} |
|
|
|
static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio) |
|
{ |
|
/* Some sort of write request has finished and it |
|
* succeeded in writing where we thought there was a |
|
* bad block. So forget the bad block. |
|
* Or possibly if failed and we need to record |
|
* a bad block. |
|
*/ |
|
int m; |
|
struct md_rdev *rdev; |
|
|
|
if (test_bit(R10BIO_IsSync, &r10_bio->state) || |
|
test_bit(R10BIO_IsRecover, &r10_bio->state)) { |
|
for (m = 0; m < conf->copies; m++) { |
|
int dev = r10_bio->devs[m].devnum; |
|
rdev = conf->mirrors[dev].rdev; |
|
if (r10_bio->devs[m].bio == NULL || |
|
r10_bio->devs[m].bio->bi_end_io == NULL) |
|
continue; |
|
if (!r10_bio->devs[m].bio->bi_status) { |
|
rdev_clear_badblocks( |
|
rdev, |
|
r10_bio->devs[m].addr, |
|
r10_bio->sectors, 0); |
|
} else { |
|
if (!rdev_set_badblocks( |
|
rdev, |
|
r10_bio->devs[m].addr, |
|
r10_bio->sectors, 0)) |
|
md_error(conf->mddev, rdev); |
|
} |
|
rdev = conf->mirrors[dev].replacement; |
|
if (r10_bio->devs[m].repl_bio == NULL || |
|
r10_bio->devs[m].repl_bio->bi_end_io == NULL) |
|
continue; |
|
|
|
if (!r10_bio->devs[m].repl_bio->bi_status) { |
|
rdev_clear_badblocks( |
|
rdev, |
|
r10_bio->devs[m].addr, |
|
r10_bio->sectors, 0); |
|
} else { |
|
if (!rdev_set_badblocks( |
|
rdev, |
|
r10_bio->devs[m].addr, |
|
r10_bio->sectors, 0)) |
|
md_error(conf->mddev, rdev); |
|
} |
|
} |
|
put_buf(r10_bio); |
|
} else { |
|
bool fail = false; |
|
for (m = 0; m < conf->copies; m++) { |
|
int dev = r10_bio->devs[m].devnum; |
|
struct bio *bio = r10_bio->devs[m].bio; |
|
rdev = conf->mirrors[dev].rdev; |
|
if (bio == IO_MADE_GOOD) { |
|
rdev_clear_badblocks( |
|
rdev, |
|
r10_bio->devs[m].addr, |
|
r10_bio->sectors, 0); |
|
rdev_dec_pending(rdev, conf->mddev); |
|
} else if (bio != NULL && bio->bi_status) { |
|
fail = true; |
|
if (!narrow_write_error(r10_bio, m)) { |
|
md_error(conf->mddev, rdev); |
|
set_bit(R10BIO_Degraded, |
|
&r10_bio->state); |
|
} |
|
rdev_dec_pending(rdev, conf->mddev); |
|
} |
|
bio = r10_bio->devs[m].repl_bio; |
|
rdev = conf->mirrors[dev].replacement; |
|
if (rdev && bio == IO_MADE_GOOD) { |
|
rdev_clear_badblocks( |
|
rdev, |
|
r10_bio->devs[m].addr, |
|
r10_bio->sectors, 0); |
|
rdev_dec_pending(rdev, conf->mddev); |
|
} |
|
} |
|
if (fail) { |
|
spin_lock_irq(&conf->device_lock); |
|
list_add(&r10_bio->retry_list, &conf->bio_end_io_list); |
|
conf->nr_queued++; |
|
spin_unlock_irq(&conf->device_lock); |
|
/* |
|
* In case freeze_array() is waiting for condition |
|
* nr_pending == nr_queued + extra to be true. |
|
*/ |
|
wake_up(&conf->wait_barrier); |
|
md_wakeup_thread(conf->mddev->thread); |
|
} else { |
|
if (test_bit(R10BIO_WriteError, |
|
&r10_bio->state)) |
|
close_write(r10_bio); |
|
raid_end_bio_io(r10_bio); |
|
} |
|
} |
|
} |
|
|
|
static void raid10d(struct md_thread *thread) |
|
{ |
|
struct mddev *mddev = thread->mddev; |
|
struct r10bio *r10_bio; |
|
unsigned long flags; |
|
struct r10conf *conf = mddev->private; |
|
struct list_head *head = &conf->retry_list; |
|
struct blk_plug plug; |
|
|
|
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)) { |
|
while (!list_empty(&conf->bio_end_io_list)) { |
|
list_move(conf->bio_end_io_list.prev, &tmp); |
|
conf->nr_queued--; |
|
} |
|
} |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
while (!list_empty(&tmp)) { |
|
r10_bio = list_first_entry(&tmp, struct r10bio, |
|
retry_list); |
|
list_del(&r10_bio->retry_list); |
|
if (mddev->degraded) |
|
set_bit(R10BIO_Degraded, &r10_bio->state); |
|
|
|
if (test_bit(R10BIO_WriteError, |
|
&r10_bio->state)) |
|
close_write(r10_bio); |
|
raid_end_bio_io(r10_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; |
|
} |
|
r10_bio = list_entry(head->prev, struct r10bio, retry_list); |
|
list_del(head->prev); |
|
conf->nr_queued--; |
|
spin_unlock_irqrestore(&conf->device_lock, flags); |
|
|
|
mddev = r10_bio->mddev; |
|
conf = mddev->private; |
|
if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
|
test_bit(R10BIO_WriteError, &r10_bio->state)) |
|
handle_write_completed(conf, r10_bio); |
|
else if (test_bit(R10BIO_IsReshape, &r10_bio->state)) |
|
reshape_request_write(mddev, r10_bio); |
|
else if (test_bit(R10BIO_IsSync, &r10_bio->state)) |
|
sync_request_write(mddev, r10_bio); |
|
else if (test_bit(R10BIO_IsRecover, &r10_bio->state)) |
|
recovery_request_write(mddev, r10_bio); |
|
else if (test_bit(R10BIO_ReadError, &r10_bio->state)) |
|
handle_read_error(mddev, r10_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 r10conf *conf) |
|
{ |
|
int ret, buffs, i; |
|
|
|
buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; |
|
BUG_ON(mempool_initialized(&conf->r10buf_pool)); |
|
conf->have_replacement = 0; |
|
for (i = 0; i < conf->geo.raid_disks; i++) |
|
if (conf->mirrors[i].replacement) |
|
conf->have_replacement = 1; |
|
ret = mempool_init(&conf->r10buf_pool, buffs, |
|
r10buf_pool_alloc, r10buf_pool_free, conf); |
|
if (ret) |
|
return ret; |
|
conf->next_resync = 0; |
|
return 0; |
|
} |
|
|
|
static struct r10bio *raid10_alloc_init_r10buf(struct r10conf *conf) |
|
{ |
|
struct r10bio *r10bio = mempool_alloc(&conf->r10buf_pool, GFP_NOIO); |
|
struct rsync_pages *rp; |
|
struct bio *bio; |
|
int nalloc; |
|
int i; |
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery) || |
|
test_bit(MD_RECOVERY_RESHAPE, &conf->mddev->recovery)) |
|
nalloc = conf->copies; /* resync */ |
|
else |
|
nalloc = 2; /* recovery */ |
|
|
|
for (i = 0; i < nalloc; i++) { |
|
bio = r10bio->devs[i].bio; |
|
rp = bio->bi_private; |
|
bio_reset(bio); |
|
bio->bi_private = rp; |
|
bio = r10bio->devs[i].repl_bio; |
|
if (bio) { |
|
rp = bio->bi_private; |
|
bio_reset(bio); |
|
bio->bi_private = rp; |
|
} |
|
} |
|
return r10bio; |
|
} |
|
|
|
/* |
|
* Set cluster_sync_high since we need other nodes to add the |
|
* range [cluster_sync_low, cluster_sync_high] to suspend list. |
|
*/ |
|
static void raid10_set_cluster_sync_high(struct r10conf *conf) |
|
{ |
|
sector_t window_size; |
|
int extra_chunk, chunks; |
|
|
|
/* |
|
* First, here we define "stripe" as a unit which across |
|
* all member devices one time, so we get chunks by use |
|
* raid_disks / near_copies. Otherwise, if near_copies is |
|
* close to raid_disks, then resync window could increases |
|
* linearly with the increase of raid_disks, which means |
|
* we will suspend a really large IO window while it is not |
|
* necessary. If raid_disks is not divisible by near_copies, |
|
* an extra chunk is needed to ensure the whole "stripe" is |
|
* covered. |
|
*/ |
|
|
|
chunks = conf->geo.raid_disks / conf->geo.near_copies; |
|
if (conf->geo.raid_disks % conf->geo.near_copies == 0) |
|
extra_chunk = 0; |
|
else |
|
extra_chunk = 1; |
|
window_size = (chunks + extra_chunk) * conf->mddev->chunk_sectors; |
|
|
|
/* |
|
* At least use a 32M window to align with raid1's resync window |
|
*/ |
|
window_size = (CLUSTER_RESYNC_WINDOW_SECTORS > window_size) ? |
|
CLUSTER_RESYNC_WINDOW_SECTORS : window_size; |
|
|
|
conf->cluster_sync_high = conf->cluster_sync_low + window_size; |
|
} |
|
|
|
/* |
|
* 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. |
|
* |
|
* Resync and recovery are handled very differently. |
|
* We differentiate by looking at MD_RECOVERY_SYNC in mddev->recovery. |
|
* |
|
* For resync, we iterate over virtual addresses, read all copies, |
|
* and update if there are differences. If only one copy is live, |
|
* skip it. |
|
* For recovery, we iterate over physical addresses, read a good |
|
* value for each non-in_sync drive, and over-write. |
|
* |
|
* So, for recovery we may have several outstanding complex requests for a |
|
* given address, one for each out-of-sync device. We model this by allocating |
|
* a number of r10_bio structures, one for each out-of-sync device. |
|
* As we setup these structures, we collect all bio's together into a list |
|
* which we then process collectively to add pages, and then process again |
|
* to pass to submit_bio_noacct. |
|
* |
|
* The r10_bio structures are linked using a borrowed master_bio pointer. |
|
* This link is counted in ->remaining. When the r10_bio that points to NULL |
|
* has its remaining count decremented to 0, the whole complex operation |
|
* is complete. |
|
* |
|
*/ |
|
|
|
static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, |
|
int *skipped) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
struct r10bio *r10_bio; |
|
struct bio *biolist = NULL, *bio; |
|
sector_t max_sector, nr_sectors; |
|
int i; |
|
int max_sync; |
|
sector_t sync_blocks; |
|
sector_t sectors_skipped = 0; |
|
int chunks_skipped = 0; |
|
sector_t chunk_mask = conf->geo.chunk_mask; |
|
int page_idx = 0; |
|
|
|
if (!mempool_initialized(&conf->r10buf_pool)) |
|
if (init_resync(conf)) |
|
return 0; |
|
|
|
/* |
|
* Allow skipping a full rebuild for incremental assembly |
|
* of a clean array, like RAID1 does. |
|
*/ |
|
if (mddev->bitmap == NULL && |
|
mddev->recovery_cp == MaxSector && |
|
mddev->reshape_position == MaxSector && |
|
!test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
|
!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
|
!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
|
conf->fullsync == 0) { |
|
*skipped = 1; |
|
return mddev->dev_sectors - sector_nr; |
|
} |
|
|
|
skipped: |
|
max_sector = mddev->dev_sectors; |
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
|
test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
|
max_sector = mddev->resync_max_sectors; |
|
if (sector_nr >= max_sector) { |
|
conf->cluster_sync_low = 0; |
|
conf->cluster_sync_high = 0; |
|
|
|
/* If we aborted, we need to abort the |
|
* sync on the 'current' bitmap chucks (there can |
|
* be several when recovering multiple devices). |
|
* as we may have started syncing it but not finished. |
|
* We can find the current address in |
|
* mddev->curr_resync, but for recovery, |
|
* we need to convert that to several |
|
* virtual addresses. |
|
*/ |
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
|
end_reshape(conf); |
|
close_sync(conf); |
|
return 0; |
|
} |
|
|
|
if (mddev->curr_resync < max_sector) { /* aborted */ |
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
|
md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
|
&sync_blocks, 1); |
|
else for (i = 0; i < conf->geo.raid_disks; i++) { |
|
sector_t sect = |
|
raid10_find_virt(conf, mddev->curr_resync, i); |
|
md_bitmap_end_sync(mddev->bitmap, sect, |
|
&sync_blocks, 1); |
|
} |
|
} else { |
|
/* completed sync */ |
|
if ((!mddev->bitmap || conf->fullsync) |
|
&& conf->have_replacement |
|
&& test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
|
/* Completed a full sync so the replacements |
|
* are now fully recovered. |
|
*/ |
|
rcu_read_lock(); |
|
for (i = 0; i < conf->geo.raid_disks; i++) { |
|
struct md_rdev *rdev = |
|
rcu_dereference(conf->mirrors[i].replacement); |
|
if (rdev) |
|
rdev->recovery_offset = MaxSector; |
|
} |
|
rcu_read_unlock(); |
|
} |
|
conf->fullsync = 0; |
|
} |
|
md_bitmap_close_sync(mddev->bitmap); |
|
close_sync(conf); |
|
*skipped = 1; |
|
return sectors_skipped; |
|
} |
|
|
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
|
return reshape_request(mddev, sector_nr, skipped); |
|
|
|
if (chunks_skipped >= conf->geo.raid_disks) { |
|
/* if there has been nothing to do on any drive, |
|
* then there is nothing to do at all.. |
|
*/ |
|
*skipped = 1; |
|
return (max_sector - sector_nr) + sectors_skipped; |
|
} |
|
|
|
if (max_sector > mddev->resync_max) |
|
max_sector = mddev->resync_max; /* Don't do IO beyond here */ |
|
|
|
/* make sure whole request will fit in a chunk - if chunks |
|
* are meaningful |
|
*/ |
|
if (conf->geo.near_copies < conf->geo.raid_disks && |
|
max_sector > (sector_nr | chunk_mask)) |
|
max_sector = (sector_nr | chunk_mask) + 1; |
|
|
|
/* |
|
* If there is non-resync activity waiting for a turn, then let it |
|
* though before starting on this new sync request. |
|
*/ |
|
if (conf->nr_waiting) |
|
schedule_timeout_uninterruptible(1); |
|
|
|
/* Again, very different code for resync and recovery. |
|
* Both must result in an r10bio with a list of bios that |
|
* have bi_end_io, bi_sector, bi_bdev set, |
|
* and bi_private set to the r10bio. |
|
* For recovery, we may actually create several r10bios |
|
* with 2 bios in each, that correspond to the bios in the main one. |
|
* In this case, the subordinate r10bios link back through a |
|
* borrowed master_bio pointer, and the counter in the master |
|
* includes a ref from each subordinate. |
|
*/ |
|
/* First, we decide what to do and set ->bi_end_io |
|
* To end_sync_read if we want to read, and |
|
* end_sync_write if we will want to write. |
|
*/ |
|
|
|
max_sync = RESYNC_PAGES << (PAGE_SHIFT-9); |
|
if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
|
/* recovery... the complicated one */ |
|
int j; |
|
r10_bio = NULL; |
|
|
|
for (i = 0 ; i < conf->geo.raid_disks; i++) { |
|
int still_degraded; |
|
struct r10bio *rb2; |
|
sector_t sect; |
|
int must_sync; |
|
int any_working; |
|
int need_recover = 0; |
|
int need_replace = 0; |
|
struct raid10_info *mirror = &conf->mirrors[i]; |
|
struct md_rdev *mrdev, *mreplace; |
|
|
|
rcu_read_lock(); |
|
mrdev = rcu_dereference(mirror->rdev); |
|
mreplace = rcu_dereference(mirror->replacement); |
|
|
|
if (mrdev != NULL && |
|
!test_bit(Faulty, &mrdev->flags) && |
|
!test_bit(In_sync, &mrdev->flags)) |
|
need_recover = 1; |
|
if (mreplace != NULL && |
|
!test_bit(Faulty, &mreplace->flags)) |
|
need_replace = 1; |
|
|
|
if (!need_recover && !need_replace) { |
|
rcu_read_unlock(); |
|
continue; |
|
} |
|
|
|
still_degraded = 0; |
|
/* want to reconstruct this device */ |
|
rb2 = r10_bio; |
|
sect = raid10_find_virt(conf, sector_nr, i); |
|
if (sect >= mddev->resync_max_sectors) { |
|
/* last stripe is not complete - don't |
|
* try to recover this sector. |
|
*/ |
|
rcu_read_unlock(); |
|
continue; |
|
} |
|
if (mreplace && test_bit(Faulty, &mreplace->flags)) |
|
mreplace = NULL; |
|
/* Unless we are doing a full sync, or a replacement |
|
* we only need to recover the block if it is set in |
|
* the bitmap |
|
*/ |
|
must_sync = md_bitmap_start_sync(mddev->bitmap, sect, |
|
&sync_blocks, 1); |
|
if (sync_blocks < max_sync) |
|
max_sync = sync_blocks; |
|
if (!must_sync && |
|
mreplace == NULL && |
|
!conf->fullsync) { |
|
/* yep, skip the sync_blocks here, but don't assume |
|
* that there will never be anything to do here |
|
*/ |
|
chunks_skipped = -1; |
|
rcu_read_unlock(); |
|
continue; |
|
} |
|
atomic_inc(&mrdev->nr_pending); |
|
if (mreplace) |
|
atomic_inc(&mreplace->nr_pending); |
|
rcu_read_unlock(); |
|
|
|
r10_bio = raid10_alloc_init_r10buf(conf); |
|
r10_bio->state = 0; |
|
raise_barrier(conf, rb2 != NULL); |
|
atomic_set(&r10_bio->remaining, 0); |
|
|
|
r10_bio->master_bio = (struct bio*)rb2; |
|
if (rb2) |
|
atomic_inc(&rb2->remaining); |
|
r10_bio->mddev = mddev; |
|
set_bit(R10BIO_IsRecover, &r10_bio->state); |
|
r10_bio->sector = sect; |
|
|
|
raid10_find_phys(conf, r10_bio); |
|
|
|
/* Need to check if the array will still be |
|
* degraded |
|
*/ |
|
rcu_read_lock(); |
|
for (j = 0; j < conf->geo.raid_disks; j++) { |
|
struct md_rdev *rdev = rcu_dereference( |
|
conf->mirrors[j].rdev); |
|
if (rdev == NULL || test_bit(Faulty, &rdev->flags)) { |
|
still_degraded = 1; |
|
break; |
|
} |
|
} |
|
|
|
must_sync = md_bitmap_start_sync(mddev->bitmap, sect, |
|
&sync_blocks, still_degraded); |
|
|
|
any_working = 0; |
|
for (j=0; j<conf->copies;j++) { |
|
int k; |
|
int d = r10_bio->devs[j].devnum; |
|
sector_t from_addr, to_addr; |
|
struct md_rdev *rdev = |
|
rcu_dereference(conf->mirrors[d].rdev); |
|
sector_t sector, first_bad; |
|
int bad_sectors; |
|
if (!rdev || |
|
!test_bit(In_sync, &rdev->flags)) |
|
continue; |
|
/* This is where we read from */ |
|
any_working = 1; |
|
sector = r10_bio->devs[j].addr; |
|
|
|
if (is_badblock(rdev, sector, max_sync, |
|
&first_bad, &bad_sectors)) { |
|
if (first_bad > sector) |
|
max_sync = first_bad - sector; |
|
else { |
|
bad_sectors -= (sector |
|
- first_bad); |
|
if (max_sync > bad_sectors) |
|
max_sync = bad_sectors; |
|
continue; |
|
} |
|
} |
|
bio = r10_bio->devs[0].bio; |
|
bio->bi_next = biolist; |
|
biolist = bio; |
|
bio->bi_end_io = end_sync_read; |
|
bio_set_op_attrs(bio, REQ_OP_READ, 0); |
|
if (test_bit(FailFast, &rdev->flags)) |
|
bio->bi_opf |= MD_FAILFAST; |
|
from_addr = r10_bio->devs[j].addr; |
|
bio->bi_iter.bi_sector = from_addr + |
|
rdev->data_offset; |
|
bio_set_dev(bio, rdev->bdev); |
|
atomic_inc(&rdev->nr_pending); |
|
/* and we write to 'i' (if not in_sync) */ |
|
|
|
for (k=0; k<conf->copies; k++) |
|
if (r10_bio->devs[k].devnum == i) |
|
break; |
|
BUG_ON(k == conf->copies); |
|
to_addr = r10_bio->devs[k].addr; |
|
r10_bio->devs[0].devnum = d; |
|
r10_bio->devs[0].addr = from_addr; |
|
r10_bio->devs[1].devnum = i; |
|
r10_bio->devs[1].addr = to_addr; |
|
|
|
if (need_recover) { |
|
bio = r10_bio->devs[1].bio; |
|
bio->bi_next = biolist; |
|
biolist = bio; |
|
bio->bi_end_io = end_sync_write; |
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
|
bio->bi_iter.bi_sector = to_addr |
|
+ mrdev->data_offset; |
|
bio_set_dev(bio, mrdev->bdev); |
|
atomic_inc(&r10_bio->remaining); |
|
} else |
|
r10_bio->devs[1].bio->bi_end_io = NULL; |
|
|
|
/* and maybe write to replacement */ |
|
bio = r10_bio->devs[1].repl_bio; |
|
if (bio) |
|
bio->bi_end_io = NULL; |
|
/* Note: if need_replace, then bio |
|
* cannot be NULL as r10buf_pool_alloc will |
|
* have allocated it. |
|
*/ |
|
if (!need_replace) |
|
break; |
|
bio->bi_next = biolist; |
|
biolist = bio; |
|
bio->bi_end_io = end_sync_write; |
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
|
bio->bi_iter.bi_sector = to_addr + |
|
mreplace->data_offset; |
|
bio_set_dev(bio, mreplace->bdev); |
|
atomic_inc(&r10_bio->remaining); |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
if (j == conf->copies) { |
|
/* Cannot recover, so abort the recovery or |
|
* record a bad block */ |
|
if (any_working) { |
|
/* problem is that there are bad blocks |
|
* on other device(s) |
|
*/ |
|
int k; |
|
for (k = 0; k < conf->copies; k++) |
|
if (r10_bio->devs[k].devnum == i) |
|
break; |
|
if (!test_bit(In_sync, |
|
&mrdev->flags) |
|
&& !rdev_set_badblocks( |
|
mrdev, |
|
r10_bio->devs[k].addr, |
|
max_sync, 0)) |
|
any_working = 0; |
|
if (mreplace && |
|
!rdev_set_badblocks( |
|
mreplace, |
|
r10_bio->devs[k].addr, |
|
max_sync, 0)) |
|
any_working = 0; |
|
} |
|
if (!any_working) { |
|
if (!test_and_set_bit(MD_RECOVERY_INTR, |
|
&mddev->recovery)) |
|
pr_warn("md/raid10:%s: insufficient working devices for recovery.\n", |
|
mdname(mddev)); |
|
mirror->recovery_disabled |
|
= mddev->recovery_disabled; |
|
} |
|
put_buf(r10_bio); |
|
if (rb2) |
|
atomic_dec(&rb2->remaining); |
|
r10_bio = rb2; |
|
rdev_dec_pending(mrdev, mddev); |
|
if (mreplace) |
|
rdev_dec_pending(mreplace, mddev); |
|
break; |
|
} |
|
rdev_dec_pending(mrdev, mddev); |
|
if (mreplace) |
|
rdev_dec_pending(mreplace, mddev); |
|
if (r10_bio->devs[0].bio->bi_opf & MD_FAILFAST) { |
|
/* Only want this if there is elsewhere to |
|
* read from. 'j' is currently the first |
|
* readable copy. |
|
*/ |
|
int targets = 1; |
|
for (; j < conf->copies; j++) { |
|
int d = r10_bio->devs[j].devnum; |
|
if (conf->mirrors[d].rdev && |
|
test_bit(In_sync, |
|
&conf->mirrors[d].rdev->flags)) |
|
targets++; |
|
} |
|
if (targets == 1) |
|
r10_bio->devs[0].bio->bi_opf |
|
&= ~MD_FAILFAST; |
|
} |
|
} |
|
if (biolist == NULL) { |
|
while (r10_bio) { |
|
struct r10bio *rb2 = r10_bio; |
|
r10_bio = (struct r10bio*) rb2->master_bio; |
|
rb2->master_bio = NULL; |
|
put_buf(rb2); |
|
} |
|
goto giveup; |
|
} |
|
} else { |
|
/* resync. Schedule a read for every block at this virt offset */ |
|
int count = 0; |
|
|
|
/* |
|
* Since curr_resync_completed could probably not update in |
|
* time, and we will set cluster_sync_low based on it. |
|
* Let's check against "sector_nr + 2 * RESYNC_SECTORS" for |
|
* safety reason, which ensures curr_resync_completed is |
|
* updated in bitmap_cond_end_sync. |
|
*/ |
|
md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, |
|
mddev_is_clustered(mddev) && |
|
(sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); |
|
|
|
if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, |
|
&sync_blocks, mddev->degraded) && |
|
!conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, |
|
&mddev->recovery)) { |
|
/* We can skip this block */ |
|
*skipped = 1; |
|
return sync_blocks + sectors_skipped; |
|
} |
|
if (sync_blocks < max_sync) |
|
max_sync = sync_blocks; |
|
r10_bio = raid10_alloc_init_r10buf(conf); |
|
r10_bio->state = 0; |
|
|
|
r10_bio->mddev = mddev; |
|
atomic_set(&r10_bio->remaining, 0); |
|
raise_barrier(conf, 0); |
|
conf->next_resync = sector_nr; |
|
|
|
r10_bio->master_bio = NULL; |
|
r10_bio->sector = sector_nr; |
|
set_bit(R10BIO_IsSync, &r10_bio->state); |
|
raid10_find_phys(conf, r10_bio); |
|
r10_bio->sectors = (sector_nr | chunk_mask) - sector_nr + 1; |
|
|
|
for (i = 0; i < conf->copies; i++) { |
|
int d = r10_bio->devs[i].devnum; |
|
sector_t first_bad, sector; |
|
int bad_sectors; |
|
struct md_rdev *rdev; |
|
|
|
if (r10_bio->devs[i].repl_bio) |
|
r10_bio->devs[i].repl_bio->bi_end_io = NULL; |
|
|
|
bio = r10_bio->devs[i].bio; |
|
bio->bi_status = BLK_STS_IOERR; |
|
rcu_read_lock(); |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (rdev == NULL || test_bit(Faulty, &rdev->flags)) { |
|
rcu_read_unlock(); |
|
continue; |
|
} |
|
sector = r10_bio->devs[i].addr; |
|
if (is_badblock(rdev, sector, max_sync, |
|
&first_bad, &bad_sectors)) { |
|
if (first_bad > sector) |
|
max_sync = first_bad - sector; |
|
else { |
|
bad_sectors -= (sector - first_bad); |
|
if (max_sync > bad_sectors) |
|
max_sync = bad_sectors; |
|
rcu_read_unlock(); |
|
continue; |
|
} |
|
} |
|
atomic_inc(&rdev->nr_pending); |
|
atomic_inc(&r10_bio->remaining); |
|
bio->bi_next = biolist; |
|
biolist = bio; |
|
bio->bi_end_io = end_sync_read; |
|
bio_set_op_attrs(bio, REQ_OP_READ, 0); |
|
if (test_bit(FailFast, &rdev->flags)) |
|
bio->bi_opf |= MD_FAILFAST; |
|
bio->bi_iter.bi_sector = sector + rdev->data_offset; |
|
bio_set_dev(bio, rdev->bdev); |
|
count++; |
|
|
|
rdev = rcu_dereference(conf->mirrors[d].replacement); |
|
if (rdev == NULL || test_bit(Faulty, &rdev->flags)) { |
|
rcu_read_unlock(); |
|
continue; |
|
} |
|
atomic_inc(&rdev->nr_pending); |
|
|
|
/* Need to set up for writing to the replacement */ |
|
bio = r10_bio->devs[i].repl_bio; |
|
bio->bi_status = BLK_STS_IOERR; |
|
|
|
sector = r10_bio->devs[i].addr; |
|
bio->bi_next = biolist; |
|
biolist = bio; |
|
bio->bi_end_io = end_sync_write; |
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
|
if (test_bit(FailFast, &rdev->flags)) |
|
bio->bi_opf |= MD_FAILFAST; |
|
bio->bi_iter.bi_sector = sector + rdev->data_offset; |
|
bio_set_dev(bio, rdev->bdev); |
|
count++; |
|
rcu_read_unlock(); |
|
} |
|
|
|
if (count < 2) { |
|
for (i=0; i<conf->copies; i++) { |
|
int d = r10_bio->devs[i].devnum; |
|
if (r10_bio->devs[i].bio->bi_end_io) |
|
rdev_dec_pending(conf->mirrors[d].rdev, |
|
mddev); |
|
if (r10_bio->devs[i].repl_bio && |
|
r10_bio->devs[i].repl_bio->bi_end_io) |
|
rdev_dec_pending( |
|
conf->mirrors[d].replacement, |
|
mddev); |
|
} |
|
put_buf(r10_bio); |
|
biolist = NULL; |
|
goto giveup; |
|
} |
|
} |
|
|
|
nr_sectors = 0; |
|
if (sector_nr + max_sync < max_sector) |
|
max_sector = sector_nr + max_sync; |
|
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; |
|
for (bio= biolist ; bio ; bio=bio->bi_next) { |
|
struct resync_pages *rp = get_resync_pages(bio); |
|
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; |
|
} while (++page_idx < RESYNC_PAGES); |
|
r10_bio->sectors = nr_sectors; |
|
|
|
if (mddev_is_clustered(mddev) && |
|
test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
|
/* It is resync not recovery */ |
|
if (conf->cluster_sync_high < sector_nr + nr_sectors) { |
|
conf->cluster_sync_low = mddev->curr_resync_completed; |
|
raid10_set_cluster_sync_high(conf); |
|
/* Send resync message */ |
|
md_cluster_ops->resync_info_update(mddev, |
|
conf->cluster_sync_low, |
|
conf->cluster_sync_high); |
|
} |
|
} else if (mddev_is_clustered(mddev)) { |
|
/* This is recovery not resync */ |
|
sector_t sect_va1, sect_va2; |
|
bool broadcast_msg = false; |
|
|
|
for (i = 0; i < conf->geo.raid_disks; i++) { |
|
/* |
|
* sector_nr is a device address for recovery, so we |
|
* need translate it to array address before compare |
|
* with cluster_sync_high. |
|
*/ |
|
sect_va1 = raid10_find_virt(conf, sector_nr, i); |
|
|
|
if (conf->cluster_sync_high < sect_va1 + nr_sectors) { |
|
broadcast_msg = true; |
|
/* |
|
* curr_resync_completed is similar as |
|
* sector_nr, so make the translation too. |
|
*/ |
|
sect_va2 = raid10_find_virt(conf, |
|
mddev->curr_resync_completed, i); |
|
|
|
if (conf->cluster_sync_low == 0 || |
|
conf->cluster_sync_low > sect_va2) |
|
conf->cluster_sync_low = sect_va2; |
|
} |
|
} |
|
if (broadcast_msg) { |
|
raid10_set_cluster_sync_high(conf); |
|
md_cluster_ops->resync_info_update(mddev, |
|
conf->cluster_sync_low, |
|
conf->cluster_sync_high); |
|
} |
|
} |
|
|
|
while (biolist) { |
|
bio = biolist; |
|
biolist = biolist->bi_next; |
|
|
|
bio->bi_next = NULL; |
|
r10_bio = get_resync_r10bio(bio); |
|
r10_bio->sectors = nr_sectors; |
|
|
|
if (bio->bi_end_io == end_sync_read) { |
|
md_sync_acct_bio(bio, nr_sectors); |
|
bio->bi_status = 0; |
|
submit_bio_noacct(bio); |
|
} |
|
} |
|
|
|
if (sectors_skipped) |
|
/* pretend they weren't skipped, it makes |
|
* no important difference in this case |
|
*/ |
|
md_done_sync(mddev, sectors_skipped, 1); |
|
|
|
return sectors_skipped + nr_sectors; |
|
giveup: |
|
/* There is nowhere to write, so all non-sync |
|
* drives must be failed or in resync, all drives |
|
* have a bad block, so try the next chunk... |
|
*/ |
|
if (sector_nr + max_sync < max_sector) |
|
max_sector = sector_nr + max_sync; |
|
|
|
sectors_skipped += (max_sector - sector_nr); |
|
chunks_skipped ++; |
|
sector_nr = max_sector; |
|
goto skipped; |
|
} |
|
|
|
static sector_t |
|
raid10_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
|
{ |
|
sector_t size; |
|
struct r10conf *conf = mddev->private; |
|
|
|
if (!raid_disks) |
|
raid_disks = min(conf->geo.raid_disks, |
|
conf->prev.raid_disks); |
|
if (!sectors) |
|
sectors = conf->dev_sectors; |
|
|
|
size = sectors >> conf->geo.chunk_shift; |
|
sector_div(size, conf->geo.far_copies); |
|
size = size * raid_disks; |
|
sector_div(size, conf->geo.near_copies); |
|
|
|
return size << conf->geo.chunk_shift; |
|
} |
|
|
|
static void calc_sectors(struct r10conf *conf, sector_t size) |
|
{ |
|
/* Calculate the number of sectors-per-device that will |
|
* actually be used, and set conf->dev_sectors and |
|
* conf->stride |
|
*/ |
|
|
|
size = size >> conf->geo.chunk_shift; |
|
sector_div(size, conf->geo.far_copies); |
|
size = size * conf->geo.raid_disks; |
|
sector_div(size, conf->geo.near_copies); |
|
/* 'size' is now the number of chunks in the array */ |
|
/* calculate "used chunks per device" */ |
|
size = size * conf->copies; |
|
|
|
/* We need to round up when dividing by raid_disks to |
|
* get the stride size. |
|
*/ |
|
size = DIV_ROUND_UP_SECTOR_T(size, conf->geo.raid_disks); |
|
|
|
conf->dev_sectors = size << conf->geo.chunk_shift; |
|
|
|
if (conf->geo.far_offset) |
|
conf->geo.stride = 1 << conf->geo.chunk_shift; |
|
else { |
|
sector_div(size, conf->geo.far_copies); |
|
conf->geo.stride = size << conf->geo.chunk_shift; |
|
} |
|
} |
|
|
|
enum geo_type {geo_new, geo_old, geo_start}; |
|
static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new) |
|
{ |
|
int nc, fc, fo; |
|
int layout, chunk, disks; |
|
switch (new) { |
|
case geo_old: |
|
layout = mddev->layout; |
|
chunk = mddev->chunk_sectors; |
|
disks = mddev->raid_disks - mddev->delta_disks; |
|
break; |
|
case geo_new: |
|
layout = mddev->new_layout; |
|
chunk = mddev->new_chunk_sectors; |
|
disks = mddev->raid_disks; |
|
break; |
|
default: /* avoid 'may be unused' warnings */ |
|
case geo_start: /* new when starting reshape - raid_disks not |
|
* updated yet. */ |
|
layout = mddev->new_layout; |
|
chunk = mddev->new_chunk_sectors; |
|
disks = mddev->raid_disks + mddev->delta_disks; |
|
break; |
|
} |
|
if (layout >> 19) |
|
return -1; |
|
if (chunk < (PAGE_SIZE >> 9) || |
|
!is_power_of_2(chunk)) |
|
return -2; |
|
nc = layout & 255; |
|
fc = (layout >> 8) & 255; |
|
fo = layout & (1<<16); |
|
geo->raid_disks = disks; |
|
geo->near_copies = nc; |
|
geo->far_copies = fc; |
|
geo->far_offset = fo; |
|
switch (layout >> 17) { |
|
case 0: /* original layout. simple but not always optimal */ |
|
geo->far_set_size = disks; |
|
break; |
|
case 1: /* "improved" layout which was buggy. Hopefully no-one is |
|
* actually using this, but leave code here just in case.*/ |
|
geo->far_set_size = disks/fc; |
|
WARN(geo->far_set_size < fc, |
|
"This RAID10 layout does not provide data safety - please backup and create new array\n"); |
|
break; |
|
case 2: /* "improved" layout fixed to match documentation */ |
|
geo->far_set_size = fc * nc; |
|
break; |
|
default: /* Not a valid layout */ |
|
return -1; |
|
} |
|
geo->chunk_mask = chunk - 1; |
|
geo->chunk_shift = ffz(~chunk); |
|
return nc*fc; |
|
} |
|
|
|
static struct r10conf *setup_conf(struct mddev *mddev) |
|
{ |
|
struct r10conf *conf = NULL; |
|
int err = -EINVAL; |
|
struct geom geo; |
|
int copies; |
|
|
|
copies = setup_geo(&geo, mddev, geo_new); |
|
|
|
if (copies == -2) { |
|
pr_warn("md/raid10:%s: chunk size must be at least PAGE_SIZE(%ld) and be a power of 2.\n", |
|
mdname(mddev), PAGE_SIZE); |
|
goto out; |
|
} |
|
|
|
if (copies < 2 || copies > mddev->raid_disks) { |
|
pr_warn("md/raid10:%s: unsupported raid10 layout: 0x%8x\n", |
|
mdname(mddev), mddev->new_layout); |
|
goto out; |
|
} |
|
|
|
err = -ENOMEM; |
|
conf = kzalloc(sizeof(struct r10conf), GFP_KERNEL); |
|
if (!conf) |
|
goto out; |
|
|
|
/* FIXME calc properly */ |
|
conf->mirrors = kcalloc(mddev->raid_disks + max(0, -mddev->delta_disks), |
|
sizeof(struct raid10_info), |
|
GFP_KERNEL); |
|
if (!conf->mirrors) |
|
goto out; |
|
|
|
conf->tmppage = alloc_page(GFP_KERNEL); |
|
if (!conf->tmppage) |
|
goto out; |
|
|
|
conf->geo = geo; |
|
conf->copies = copies; |
|
err = mempool_init(&conf->r10bio_pool, NR_RAID_BIOS, r10bio_pool_alloc, |
|
rbio_pool_free, conf); |
|
if (err) |
|
goto out; |
|
|
|
err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
|
if (err) |
|
goto out; |
|
|
|
calc_sectors(conf, mddev->dev_sectors); |
|
if (mddev->reshape_position == MaxSector) { |
|
conf->prev = conf->geo; |
|
conf->reshape_progress = MaxSector; |
|
} else { |
|
if (setup_geo(&conf->prev, mddev, geo_old) != conf->copies) { |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
conf->reshape_progress = mddev->reshape_position; |
|
if (conf->prev.far_offset) |
|
conf->prev.stride = 1 << conf->prev.chunk_shift; |
|
else |
|
/* far_copies must be 1 */ |
|
conf->prev.stride = conf->dev_sectors; |
|
} |
|
conf->reshape_safe = conf->reshape_progress; |
|
spin_lock_init(&conf->device_lock); |
|
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); |
|
atomic_set(&conf->nr_pending, 0); |
|
|
|
err = -ENOMEM; |
|
conf->thread = md_register_thread(raid10d, mddev, "raid10"); |
|
if (!conf->thread) |
|
goto out; |
|
|
|
conf->mddev = mddev; |
|
return conf; |
|
|
|
out: |
|
if (conf) { |
|
mempool_exit(&conf->r10bio_pool); |
|
kfree(conf->mirrors); |
|
safe_put_page(conf->tmppage); |
|
bioset_exit(&conf->bio_split); |
|
kfree(conf); |
|
} |
|
return ERR_PTR(err); |
|
} |
|
|
|
static void raid10_set_io_opt(struct r10conf *conf) |
|
{ |
|
int raid_disks = conf->geo.raid_disks; |
|
|
|
if (!(conf->geo.raid_disks % conf->geo.near_copies)) |
|
raid_disks /= conf->geo.near_copies; |
|
blk_queue_io_opt(conf->mddev->queue, (conf->mddev->chunk_sectors << 9) * |
|
raid_disks); |
|
} |
|
|
|
static int raid10_run(struct mddev *mddev) |
|
{ |
|
struct r10conf *conf; |
|
int i, disk_idx; |
|
struct raid10_info *disk; |
|
struct md_rdev *rdev; |
|
sector_t size; |
|
sector_t min_offset_diff = 0; |
|
int first = 1; |
|
bool discard_supported = false; |
|
|
|
if (mddev_init_writes_pending(mddev) < 0) |
|
return -ENOMEM; |
|
|
|
if (mddev->private == NULL) { |
|
conf = setup_conf(mddev); |
|
if (IS_ERR(conf)) |
|
return PTR_ERR(conf); |
|
mddev->private = conf; |
|
} |
|
conf = mddev->private; |
|
if (!conf) |
|
goto out; |
|
|
|
if (mddev_is_clustered(conf->mddev)) { |
|
int fc, fo; |
|
|
|
fc = (mddev->layout >> 8) & 255; |
|
fo = mddev->layout & (1<<16); |
|
if (fc > 1 || fo > 0) { |
|
pr_err("only near layout is supported by clustered" |
|
" raid10\n"); |
|
goto out_free_conf; |
|
} |
|
} |
|
|
|
mddev->thread = conf->thread; |
|
conf->thread = NULL; |
|
|
|
if (mddev->queue) { |
|
blk_queue_max_discard_sectors(mddev->queue, |
|
UINT_MAX); |
|
blk_queue_max_write_same_sectors(mddev->queue, 0); |
|
blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
|
blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); |
|
raid10_set_io_opt(conf); |
|
} |
|
|
|
rdev_for_each(rdev, mddev) { |
|
long long diff; |
|
|
|
disk_idx = rdev->raid_disk; |
|
if (disk_idx < 0) |
|
continue; |
|
if (disk_idx >= conf->geo.raid_disks && |
|
disk_idx >= conf->prev.raid_disks) |
|
continue; |
|
disk = conf->mirrors + disk_idx; |
|
|
|
if (test_bit(Replacement, &rdev->flags)) { |
|
if (disk->replacement) |
|
goto out_free_conf; |
|
disk->replacement = rdev; |
|
} else { |
|
if (disk->rdev) |
|
goto out_free_conf; |
|
disk->rdev = rdev; |
|
} |
|
diff = (rdev->new_data_offset - rdev->data_offset); |
|
if (!mddev->reshape_backwards) |
|
diff = -diff; |
|
if (diff < 0) |
|
diff = 0; |
|
if (first || diff < min_offset_diff) |
|
min_offset_diff = diff; |
|
|
|
if (mddev->gendisk) |
|
disk_stack_limits(mddev->gendisk, rdev->bdev, |
|
rdev->data_offset << 9); |
|
|
|
disk->head_position = 0; |
|
|
|
if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
|
discard_supported = true; |
|
first = 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); |
|
} |
|
/* need to check that every block has at least one working mirror */ |
|
if (!enough(conf, -1)) { |
|
pr_err("md/raid10:%s: not enough operational mirrors.\n", |
|
mdname(mddev)); |
|
goto out_free_conf; |
|
} |
|
|
|
if (conf->reshape_progress != MaxSector) { |
|
/* must ensure that shape change is supported */ |
|
if (conf->geo.far_copies != 1 && |
|
conf->geo.far_offset == 0) |
|
goto out_free_conf; |
|
if (conf->prev.far_copies != 1 && |
|
conf->prev.far_offset == 0) |
|
goto out_free_conf; |
|
} |
|
|
|
mddev->degraded = 0; |
|
for (i = 0; |
|
i < conf->geo.raid_disks |
|
|| i < conf->prev.raid_disks; |
|
i++) { |
|
|
|
disk = conf->mirrors + i; |
|
|
|
if (!disk->rdev && disk->replacement) { |
|
/* The replacement is all we have - use it */ |
|
disk->rdev = disk->replacement; |
|
disk->replacement = NULL; |
|
clear_bit(Replacement, &disk->rdev->flags); |
|
} |
|
|
|
if (!disk->rdev || |
|
!test_bit(In_sync, &disk->rdev->flags)) { |
|
disk->head_position = 0; |
|
mddev->degraded++; |
|
if (disk->rdev && |
|
disk->rdev->saved_raid_disk < 0) |
|
conf->fullsync = 1; |
|
} |
|
|
|
if (disk->replacement && |
|
!test_bit(In_sync, &disk->replacement->flags) && |
|
disk->replacement->saved_raid_disk < 0) { |
|
conf->fullsync = 1; |
|
} |
|
|
|
disk->recovery_disabled = mddev->recovery_disabled - 1; |
|
} |
|
|
|
if (mddev->recovery_cp != MaxSector) |
|
pr_notice("md/raid10:%s: not clean -- starting background reconstruction\n", |
|
mdname(mddev)); |
|
pr_info("md/raid10:%s: active with %d out of %d devices\n", |
|
mdname(mddev), conf->geo.raid_disks - mddev->degraded, |
|
conf->geo.raid_disks); |
|
/* |
|
* Ok, everything is just fine now |
|
*/ |
|
mddev->dev_sectors = conf->dev_sectors; |
|
size = raid10_size(mddev, 0, 0); |
|
md_set_array_sectors(mddev, size); |
|
mddev->resync_max_sectors = size; |
|
set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
|
|
|
if (md_integrity_register(mddev)) |
|
goto out_free_conf; |
|
|
|
if (conf->reshape_progress != MaxSector) { |
|
unsigned long before_length, after_length; |
|
|
|
before_length = ((1 << conf->prev.chunk_shift) * |
|
conf->prev.far_copies); |
|
after_length = ((1 << conf->geo.chunk_shift) * |
|
conf->geo.far_copies); |
|
|
|
if (max(before_length, after_length) > min_offset_diff) { |
|
/* This cannot work */ |
|
pr_warn("md/raid10: offset difference not enough to continue reshape\n"); |
|
goto out_free_conf; |
|
} |
|
conf->offset_diff = min_offset_diff; |
|
|
|
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
|
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
|
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
|
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
|
mddev->sync_thread = md_register_thread(md_do_sync, mddev, |
|
"reshape"); |
|
if (!mddev->sync_thread) |
|
goto out_free_conf; |
|
} |
|
|
|
return 0; |
|
|
|
out_free_conf: |
|
md_unregister_thread(&mddev->thread); |
|
mempool_exit(&conf->r10bio_pool); |
|
safe_put_page(conf->tmppage); |
|
kfree(conf->mirrors); |
|
kfree(conf); |
|
mddev->private = NULL; |
|
out: |
|
return -EIO; |
|
} |
|
|
|
static void raid10_free(struct mddev *mddev, void *priv) |
|
{ |
|
struct r10conf *conf = priv; |
|
|
|
mempool_exit(&conf->r10bio_pool); |
|
safe_put_page(conf->tmppage); |
|
kfree(conf->mirrors); |
|
kfree(conf->mirrors_old); |
|
kfree(conf->mirrors_new); |
|
bioset_exit(&conf->bio_split); |
|
kfree(conf); |
|
} |
|
|
|
static void raid10_quiesce(struct mddev *mddev, int quiesce) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
|
|
if (quiesce) |
|
raise_barrier(conf, 0); |
|
else |
|
lower_barrier(conf); |
|
} |
|
|
|
static int raid10_resize(struct mddev *mddev, sector_t sectors) |
|
{ |
|
/* Resize of 'far' arrays is not supported. |
|
* For 'near' and 'offset' arrays we can set the |
|
* number of sectors used to be an appropriate multiple |
|
* of the chunk size. |
|
* For 'offset', this is far_copies*chunksize. |
|
* For 'near' the multiplier is the LCM of |
|
* near_copies and raid_disks. |
|
* So if far_copies > 1 && !far_offset, fail. |
|
* Else find LCM(raid_disks, near_copy)*far_copies and |
|
* multiply by chunk_size. Then round to this number. |
|
* This is mostly done by raid10_size() |
|
*/ |
|
struct r10conf *conf = mddev->private; |
|
sector_t oldsize, size; |
|
|
|
if (mddev->reshape_position != MaxSector) |
|
return -EBUSY; |
|
|
|
if (conf->geo.far_copies > 1 && !conf->geo.far_offset) |
|
return -EINVAL; |
|
|
|
oldsize = raid10_size(mddev, 0, 0); |
|
size = raid10_size(mddev, sectors, 0); |
|
if (mddev->external_size && |
|
mddev->array_sectors > size) |
|
return -EINVAL; |
|
if (mddev->bitmap) { |
|
int ret = md_bitmap_resize(mddev->bitmap, size, 0, 0); |
|
if (ret) |
|
return ret; |
|
} |
|
md_set_array_sectors(mddev, size); |
|
if (sectors > mddev->dev_sectors && |
|
mddev->recovery_cp > oldsize) { |
|
mddev->recovery_cp = oldsize; |
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
|
} |
|
calc_sectors(conf, sectors); |
|
mddev->dev_sectors = conf->dev_sectors; |
|
mddev->resync_max_sectors = size; |
|
return 0; |
|
} |
|
|
|
static void *raid10_takeover_raid0(struct mddev *mddev, sector_t size, int devs) |
|
{ |
|
struct md_rdev *rdev; |
|
struct r10conf *conf; |
|
|
|
if (mddev->degraded > 0) { |
|
pr_warn("md/raid10:%s: Error: degraded raid0!\n", |
|
mdname(mddev)); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
sector_div(size, devs); |
|
|
|
/* Set new parameters */ |
|
mddev->new_level = 10; |
|
/* new layout: far_copies = 1, near_copies = 2 */ |
|
mddev->new_layout = (1<<8) + 2; |
|
mddev->new_chunk_sectors = mddev->chunk_sectors; |
|
mddev->delta_disks = mddev->raid_disks; |
|
mddev->raid_disks *= 2; |
|
/* make sure it will be not marked as dirty */ |
|
mddev->recovery_cp = MaxSector; |
|
mddev->dev_sectors = size; |
|
|
|
conf = setup_conf(mddev); |
|
if (!IS_ERR(conf)) { |
|
rdev_for_each(rdev, mddev) |
|
if (rdev->raid_disk >= 0) { |
|
rdev->new_raid_disk = rdev->raid_disk * 2; |
|
rdev->sectors = size; |
|
} |
|
conf->barrier = 1; |
|
} |
|
|
|
return conf; |
|
} |
|
|
|
static void *raid10_takeover(struct mddev *mddev) |
|
{ |
|
struct r0conf *raid0_conf; |
|
|
|
/* raid10 can take over: |
|
* raid0 - providing it has only two drives |
|
*/ |
|
if (mddev->level == 0) { |
|
/* for raid0 takeover only one zone is supported */ |
|
raid0_conf = mddev->private; |
|
if (raid0_conf->nr_strip_zones > 1) { |
|
pr_warn("md/raid10:%s: cannot takeover raid 0 with more than one zone.\n", |
|
mdname(mddev)); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
return raid10_takeover_raid0(mddev, |
|
raid0_conf->strip_zone->zone_end, |
|
raid0_conf->strip_zone->nb_dev); |
|
} |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
static int raid10_check_reshape(struct mddev *mddev) |
|
{ |
|
/* Called when there is a request to change |
|
* - layout (to ->new_layout) |
|
* - chunk size (to ->new_chunk_sectors) |
|
* - raid_disks (by delta_disks) |
|
* or when trying to restart a reshape that was ongoing. |
|
* |
|
* We need to validate the request and possibly allocate |
|
* space if that might be an issue later. |
|
* |
|
* Currently we reject any reshape of a 'far' mode array, |
|
* allow chunk size to change if new is generally acceptable, |
|
* allow raid_disks to increase, and allow |
|
* a switch between 'near' mode and 'offset' mode. |
|
*/ |
|
struct r10conf *conf = mddev->private; |
|
struct geom geo; |
|
|
|
if (conf->geo.far_copies != 1 && !conf->geo.far_offset) |
|
return -EINVAL; |
|
|
|
if (setup_geo(&geo, mddev, geo_start) != conf->copies) |
|
/* mustn't change number of copies */ |
|
return -EINVAL; |
|
if (geo.far_copies > 1 && !geo.far_offset) |
|
/* Cannot switch to 'far' mode */ |
|
return -EINVAL; |
|
|
|
if (mddev->array_sectors & geo.chunk_mask) |
|
/* not factor of array size */ |
|
return -EINVAL; |
|
|
|
if (!enough(conf, -1)) |
|
return -EINVAL; |
|
|
|
kfree(conf->mirrors_new); |
|
conf->mirrors_new = NULL; |
|
if (mddev->delta_disks > 0) { |
|
/* allocate new 'mirrors' list */ |
|
conf->mirrors_new = |
|
kcalloc(mddev->raid_disks + mddev->delta_disks, |
|
sizeof(struct raid10_info), |
|
GFP_KERNEL); |
|
if (!conf->mirrors_new) |
|
return -ENOMEM; |
|
} |
|
return 0; |
|
} |
|
|
|
/* |
|
* Need to check if array has failed when deciding whether to: |
|
* - start an array |
|
* - remove non-faulty devices |
|
* - add a spare |
|
* - allow a reshape |
|
* This determination is simple when no reshape is happening. |
|
* However if there is a reshape, we need to carefully check |
|
* both the before and after sections. |
|
* This is because some failed devices may only affect one |
|
* of the two sections, and some non-in_sync devices may |
|
* be insync in the section most affected by failed devices. |
|
*/ |
|
static int calc_degraded(struct r10conf *conf) |
|
{ |
|
int degraded, degraded2; |
|
int i; |
|
|
|
rcu_read_lock(); |
|
degraded = 0; |
|
/* 'prev' section first */ |
|
for (i = 0; i < conf->prev.raid_disks; i++) { |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
|
if (!rdev || test_bit(Faulty, &rdev->flags)) |
|
degraded++; |
|
else if (!test_bit(In_sync, &rdev->flags)) |
|
/* When we can reduce the number of devices in |
|
* an array, this might not contribute to |
|
* 'degraded'. It does now. |
|
*/ |
|
degraded++; |
|
} |
|
rcu_read_unlock(); |
|
if (conf->geo.raid_disks == conf->prev.raid_disks) |
|
return degraded; |
|
rcu_read_lock(); |
|
degraded2 = 0; |
|
for (i = 0; i < conf->geo.raid_disks; i++) { |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
|
if (!rdev || test_bit(Faulty, &rdev->flags)) |
|
degraded2++; |
|
else if (!test_bit(In_sync, &rdev->flags)) { |
|
/* If reshape is increasing the number of devices, |
|
* this section has already been recovered, so |
|
* it doesn't contribute to degraded. |
|
* else it does. |
|
*/ |
|
if (conf->geo.raid_disks <= conf->prev.raid_disks) |
|
degraded2++; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
if (degraded2 > degraded) |
|
return degraded2; |
|
return degraded; |
|
} |
|
|
|
static int raid10_start_reshape(struct mddev *mddev) |
|
{ |
|
/* A 'reshape' has been requested. This commits |
|
* the various 'new' fields and sets MD_RECOVER_RESHAPE |
|
* This also checks if there are enough spares and adds them |
|
* to the array. |
|
* We currently require enough spares to make the final |
|
* array non-degraded. We also require that the difference |
|
* between old and new data_offset - on each device - is |
|
* enough that we never risk over-writing. |
|
*/ |
|
|
|
unsigned long before_length, after_length; |
|
sector_t min_offset_diff = 0; |
|
int first = 1; |
|
struct geom new; |
|
struct r10conf *conf = mddev->private; |
|
struct md_rdev *rdev; |
|
int spares = 0; |
|
int ret; |
|
|
|
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
|
return -EBUSY; |
|
|
|
if (setup_geo(&new, mddev, geo_start) != conf->copies) |
|
return -EINVAL; |
|
|
|
before_length = ((1 << conf->prev.chunk_shift) * |
|
conf->prev.far_copies); |
|
after_length = ((1 << conf->geo.chunk_shift) * |
|
conf->geo.far_copies); |
|
|
|
rdev_for_each(rdev, mddev) { |
|
if (!test_bit(In_sync, &rdev->flags) |
|
&& !test_bit(Faulty, &rdev->flags)) |
|
spares++; |
|
if (rdev->raid_disk >= 0) { |
|
long long diff = (rdev->new_data_offset |
|
- rdev->data_offset); |
|
if (!mddev->reshape_backwards) |
|
diff = -diff; |
|
if (diff < 0) |
|
diff = 0; |
|
if (first || diff < min_offset_diff) |
|
min_offset_diff = diff; |
|
first = 0; |
|
} |
|
} |
|
|
|
if (max(before_length, after_length) > min_offset_diff) |
|
return -EINVAL; |
|
|
|
if (spares < mddev->delta_disks) |
|
return -EINVAL; |
|
|
|
conf->offset_diff = min_offset_diff; |
|
spin_lock_irq(&conf->device_lock); |
|
if (conf->mirrors_new) { |
|
memcpy(conf->mirrors_new, conf->mirrors, |
|
sizeof(struct raid10_info)*conf->prev.raid_disks); |
|
smp_mb(); |
|
kfree(conf->mirrors_old); |
|
conf->mirrors_old = conf->mirrors; |
|
conf->mirrors = conf->mirrors_new; |
|
conf->mirrors_new = NULL; |
|
} |
|
setup_geo(&conf->geo, mddev, geo_start); |
|
smp_mb(); |
|
if (mddev->reshape_backwards) { |
|
sector_t size = raid10_size(mddev, 0, 0); |
|
if (size < mddev->array_sectors) { |
|
spin_unlock_irq(&conf->device_lock); |
|
pr_warn("md/raid10:%s: array size must be reduce before number of disks\n", |
|
mdname(mddev)); |
|
return -EINVAL; |
|
} |
|
mddev->resync_max_sectors = size; |
|
conf->reshape_progress = size; |
|
} else |
|
conf->reshape_progress = 0; |
|
conf->reshape_safe = conf->reshape_progress; |
|
spin_unlock_irq(&conf->device_lock); |
|
|
|
if (mddev->delta_disks && mddev->bitmap) { |
|
struct mdp_superblock_1 *sb = NULL; |
|
sector_t oldsize, newsize; |
|
|
|
oldsize = raid10_size(mddev, 0, 0); |
|
newsize = raid10_size(mddev, 0, conf->geo.raid_disks); |
|
|
|
if (!mddev_is_clustered(mddev)) { |
|
ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); |
|
if (ret) |
|
goto abort; |
|
else |
|
goto out; |
|
} |
|
|
|
rdev_for_each(rdev, mddev) { |
|
if (rdev->raid_disk > -1 && |
|
!test_bit(Faulty, &rdev->flags)) |
|
sb = page_address(rdev->sb_page); |
|
} |
|
|
|
/* |
|
* some node is already performing reshape, and no need to |
|
* call md_bitmap_resize again since it should be called when |
|
* receiving BITMAP_RESIZE msg |
|
*/ |
|
if ((sb && (le32_to_cpu(sb->feature_map) & |
|
MD_FEATURE_RESHAPE_ACTIVE)) || (oldsize == newsize)) |
|
goto out; |
|
|
|
ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); |
|
if (ret) |
|
goto abort; |
|
|
|
ret = md_cluster_ops->resize_bitmaps(mddev, newsize, oldsize); |
|
if (ret) { |
|
md_bitmap_resize(mddev->bitmap, oldsize, 0, 0); |
|
goto abort; |
|
} |
|
} |
|
out: |
|
if (mddev->delta_disks > 0) { |
|
rdev_for_each(rdev, mddev) |
|
if (rdev->raid_disk < 0 && |
|
!test_bit(Faulty, &rdev->flags)) { |
|
if (raid10_add_disk(mddev, rdev) == 0) { |
|
if (rdev->raid_disk >= |
|
conf->prev.raid_disks) |
|
set_bit(In_sync, &rdev->flags); |
|
else |
|
rdev->recovery_offset = 0; |
|
|
|
/* Failure here is OK */ |
|
sysfs_link_rdev(mddev, rdev); |
|
} |
|
} else if (rdev->raid_disk >= conf->prev.raid_disks |
|
&& !test_bit(Faulty, &rdev->flags)) { |
|
/* This is a spare that was manually added */ |
|
set_bit(In_sync, &rdev->flags); |
|
} |
|
} |
|
/* When a reshape changes the number of devices, |
|
* ->degraded is measured against the larger of the |
|
* pre and post numbers. |
|
*/ |
|
spin_lock_irq(&conf->device_lock); |
|
mddev->degraded = calc_degraded(conf); |
|
spin_unlock_irq(&conf->device_lock); |
|
mddev->raid_disks = conf->geo.raid_disks; |
|
mddev->reshape_position = conf->reshape_progress; |
|
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
|
|
|
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
|
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
|
clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
|
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
|
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
|
|
|
mddev->sync_thread = md_register_thread(md_do_sync, mddev, |
|
"reshape"); |
|
if (!mddev->sync_thread) { |
|
ret = -EAGAIN; |
|
goto abort; |
|
} |
|
conf->reshape_checkpoint = jiffies; |
|
md_wakeup_thread(mddev->sync_thread); |
|
md_new_event(mddev); |
|
return 0; |
|
|
|
abort: |
|
mddev->recovery = 0; |
|
spin_lock_irq(&conf->device_lock); |
|
conf->geo = conf->prev; |
|
mddev->raid_disks = conf->geo.raid_disks; |
|
rdev_for_each(rdev, mddev) |
|
rdev->new_data_offset = rdev->data_offset; |
|
smp_wmb(); |
|
conf->reshape_progress = MaxSector; |
|
conf->reshape_safe = MaxSector; |
|
mddev->reshape_position = MaxSector; |
|
spin_unlock_irq(&conf->device_lock); |
|
return ret; |
|
} |
|
|
|
/* Calculate the last device-address that could contain |
|
* any block from the chunk that includes the array-address 's' |
|
* and report the next address. |
|
* i.e. the address returned will be chunk-aligned and after |
|
* any data that is in the chunk containing 's'. |
|
*/ |
|
static sector_t last_dev_address(sector_t s, struct geom *geo) |
|
{ |
|
s = (s | geo->chunk_mask) + 1; |
|
s >>= geo->chunk_shift; |
|
s *= geo->near_copies; |
|
s = DIV_ROUND_UP_SECTOR_T(s, geo->raid_disks); |
|
s *= geo->far_copies; |
|
s <<= geo->chunk_shift; |
|
return s; |
|
} |
|
|
|
/* Calculate the first device-address that could contain |
|
* any block from the chunk that includes the array-address 's'. |
|
* This too will be the start of a chunk |
|
*/ |
|
static sector_t first_dev_address(sector_t s, struct geom *geo) |
|
{ |
|
s >>= geo->chunk_shift; |
|
s *= geo->near_copies; |
|
sector_div(s, geo->raid_disks); |
|
s *= geo->far_copies; |
|
s <<= geo->chunk_shift; |
|
return s; |
|
} |
|
|
|
static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, |
|
int *skipped) |
|
{ |
|
/* We simply copy at most one chunk (smallest of old and new) |
|
* at a time, possibly less if that exceeds RESYNC_PAGES, |
|
* or we hit a bad block or something. |
|
* This might mean we pause for normal IO in the middle of |
|
* a chunk, but that is not a problem as mddev->reshape_position |
|
* can record any location. |
|
* |
|
* If we will want to write to a location that isn't |
|
* yet recorded as 'safe' (i.e. in metadata on disk) then |
|
* we need to flush all reshape requests and update the metadata. |
|
* |
|
* When reshaping forwards (e.g. to more devices), we interpret |
|
* 'safe' as the earliest block which might not have been copied |
|
* down yet. We divide this by previous stripe size and multiply |
|
* by previous stripe length to get lowest device offset that we |
|
* cannot write to yet. |
|
* We interpret 'sector_nr' as an address that we want to write to. |
|
* From this we use last_device_address() to find where we might |
|
* write to, and first_device_address on the 'safe' position. |
|
* If this 'next' write position is after the 'safe' position, |
|
* we must update the metadata to increase the 'safe' position. |
|
* |
|
* When reshaping backwards, we round in the opposite direction |
|
* and perform the reverse test: next write position must not be |
|
* less than current safe position. |
|
* |
|
* In all this the minimum difference in data offsets |
|
* (conf->offset_diff - always positive) allows a bit of slack, |
|
* so next can be after 'safe', but not by more than offset_diff |
|
* |
|
* We need to prepare all the bios here before we start any IO |
|
* to ensure the size we choose is acceptable to all devices. |
|
* The means one for each copy for write-out and an extra one for |
|
* read-in. |
|
* We store the read-in bio in ->master_bio and the others in |
|
* ->devs[x].bio and ->devs[x].repl_bio. |
|
*/ |
|
struct r10conf *conf = mddev->private; |
|
struct r10bio *r10_bio; |
|
sector_t next, safe, last; |
|
int max_sectors; |
|
int nr_sectors; |
|
int s; |
|
struct md_rdev *rdev; |
|
int need_flush = 0; |
|
struct bio *blist; |
|
struct bio *bio, *read_bio; |
|
int sectors_done = 0; |
|
struct page **pages; |
|
|
|
if (sector_nr == 0) { |
|
/* If restarting in the middle, skip the initial sectors */ |
|
if (mddev->reshape_backwards && |
|
conf->reshape_progress < raid10_size(mddev, 0, 0)) { |
|
sector_nr = (raid10_size(mddev, 0, 0) |
|
- conf->reshape_progress); |
|
} else if (!mddev->reshape_backwards && |
|
conf->reshape_progress > 0) |
|
sector_nr = conf->reshape_progress; |
|
if (sector_nr) { |
|
mddev->curr_resync_completed = sector_nr; |
|
sysfs_notify_dirent_safe(mddev->sysfs_completed); |
|
*skipped = 1; |
|
return sector_nr; |
|
} |
|
} |
|
|
|
/* We don't use sector_nr to track where we are up to |
|
* as that doesn't work well for ->reshape_backwards. |
|
* So just use ->reshape_progress. |
|
*/ |
|
if (mddev->reshape_backwards) { |
|
/* 'next' is the earliest device address that we might |
|
* write to for this chunk in the new layout |
|
*/ |
|
next = first_dev_address(conf->reshape_progress - 1, |
|
&conf->geo); |
|
|
|
/* 'safe' is the last device address that we might read from |
|
* in the old layout after a restart |
|
*/ |
|
safe = last_dev_address(conf->reshape_safe - 1, |
|
&conf->prev); |
|
|
|
if (next + conf->offset_diff < safe) |
|
need_flush = 1; |
|
|
|
last = conf->reshape_progress - 1; |
|
sector_nr = last & ~(sector_t)(conf->geo.chunk_mask |
|
& conf->prev.chunk_mask); |
|
if (sector_nr + RESYNC_SECTORS < last) |
|
sector_nr = last + 1 - RESYNC_SECTORS; |
|
} else { |
|
/* 'next' is after the last device address that we |
|
* might write to for this chunk in the new layout |
|
*/ |
|
next = last_dev_address(conf->reshape_progress, &conf->geo); |
|
|
|
/* 'safe' is the earliest device address that we might |
|
* read from in the old layout after a restart |
|
*/ |
|
safe = first_dev_address(conf->reshape_safe, &conf->prev); |
|
|
|
/* Need to update metadata if 'next' might be beyond 'safe' |
|
* as that would possibly corrupt data |
|
*/ |
|
if (next > safe + conf->offset_diff) |
|
need_flush = 1; |
|
|
|
sector_nr = conf->reshape_progress; |
|
last = sector_nr | (conf->geo.chunk_mask |
|
& conf->prev.chunk_mask); |
|
|
|
if (sector_nr + RESYNC_SECTORS <= last) |
|
last = sector_nr + RESYNC_SECTORS - 1; |
|
} |
|
|
|
if (need_flush || |
|
time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { |
|
/* Need to update reshape_position in metadata */ |
|
wait_barrier(conf); |
|
mddev->reshape_position = conf->reshape_progress; |
|
if (mddev->reshape_backwards) |
|
mddev->curr_resync_completed = raid10_size(mddev, 0, 0) |
|
- conf->reshape_progress; |
|
else |
|
mddev->curr_resync_completed = conf->reshape_progress; |
|
conf->reshape_checkpoint = jiffies; |
|
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
|
md_wakeup_thread(mddev->thread); |
|
wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
|
test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
|
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
|
allow_barrier(conf); |
|
return sectors_done; |
|
} |
|
conf->reshape_safe = mddev->reshape_position; |
|
allow_barrier(conf); |
|
} |
|
|
|
raise_barrier(conf, 0); |
|
read_more: |
|
/* Now schedule reads for blocks from sector_nr to last */ |
|
r10_bio = raid10_alloc_init_r10buf(conf); |
|
r10_bio->state = 0; |
|
raise_barrier(conf, 1); |
|
atomic_set(&r10_bio->remaining, 0); |
|
r10_bio->mddev = mddev; |
|
r10_bio->sector = sector_nr; |
|
set_bit(R10BIO_IsReshape, &r10_bio->state); |
|
r10_bio->sectors = last - sector_nr + 1; |
|
rdev = read_balance(conf, r10_bio, &max_sectors); |
|
BUG_ON(!test_bit(R10BIO_Previous, &r10_bio->state)); |
|
|
|
if (!rdev) { |
|
/* Cannot read from here, so need to record bad blocks |
|
* on all the target devices. |
|
*/ |
|
// FIXME |
|
mempool_free(r10_bio, &conf->r10buf_pool); |
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
|
return sectors_done; |
|
} |
|
|
|
read_bio = bio_alloc_bioset(GFP_KERNEL, RESYNC_PAGES, &mddev->bio_set); |
|
|
|
bio_set_dev(read_bio, rdev->bdev); |
|
read_bio->bi_iter.bi_sector = (r10_bio->devs[r10_bio->read_slot].addr |
|
+ rdev->data_offset); |
|
read_bio->bi_private = r10_bio; |
|
read_bio->bi_end_io = end_reshape_read; |
|
bio_set_op_attrs(read_bio, REQ_OP_READ, 0); |
|
r10_bio->master_bio = read_bio; |
|
r10_bio->read_slot = r10_bio->devs[r10_bio->read_slot].devnum; |
|
|
|
/* |
|
* Broadcast RESYNC message to other nodes, so all nodes would not |
|
* write to the region to avoid conflict. |
|
*/ |
|
if (mddev_is_clustered(mddev) && conf->cluster_sync_high <= sector_nr) { |
|
struct mdp_superblock_1 *sb = NULL; |
|
int sb_reshape_pos = 0; |
|
|
|
conf->cluster_sync_low = sector_nr; |
|
conf->cluster_sync_high = sector_nr + CLUSTER_RESYNC_WINDOW_SECTORS; |
|
sb = page_address(rdev->sb_page); |
|
if (sb) { |
|
sb_reshape_pos = le64_to_cpu(sb->reshape_position); |
|
/* |
|
* Set cluster_sync_low again if next address for array |
|
* reshape is less than cluster_sync_low. Since we can't |
|
* update cluster_sync_low until it has finished reshape. |
|
*/ |
|
if (sb_reshape_pos < conf->cluster_sync_low) |
|
conf->cluster_sync_low = sb_reshape_pos; |
|
} |
|
|
|
md_cluster_ops->resync_info_update(mddev, conf->cluster_sync_low, |
|
conf->cluster_sync_high); |
|
} |
|
|
|
/* Now find the locations in the new layout */ |
|
__raid10_find_phys(&conf->geo, r10_bio); |
|
|
|
blist = read_bio; |
|
read_bio->bi_next = NULL; |
|
|
|
rcu_read_lock(); |
|
for (s = 0; s < conf->copies*2; s++) { |
|
struct bio *b; |
|
int d = r10_bio->devs[s/2].devnum; |
|
struct md_rdev *rdev2; |
|
if (s&1) { |
|
rdev2 = rcu_dereference(conf->mirrors[d].replacement); |
|
b = r10_bio->devs[s/2].repl_bio; |
|
} else { |
|
rdev2 = rcu_dereference(conf->mirrors[d].rdev); |
|
b = r10_bio->devs[s/2].bio; |
|
} |
|
if (!rdev2 || test_bit(Faulty, &rdev2->flags)) |
|
continue; |
|
|
|
bio_set_dev(b, rdev2->bdev); |
|
b->bi_iter.bi_sector = r10_bio->devs[s/2].addr + |
|
rdev2->new_data_offset; |
|
b->bi_end_io = end_reshape_write; |
|
bio_set_op_attrs(b, REQ_OP_WRITE, 0); |
|
b->bi_next = blist; |
|
blist = b; |
|
} |
|
|
|
/* Now add as many pages as possible to all of these bios. */ |
|
|
|
nr_sectors = 0; |
|
pages = get_resync_pages(r10_bio->devs[0].bio)->pages; |
|
for (s = 0 ; s < max_sectors; s += PAGE_SIZE >> 9) { |
|
struct page *page = pages[s / (PAGE_SIZE >> 9)]; |
|
int len = (max_sectors - s) << 9; |
|
if (len > PAGE_SIZE) |
|
len = PAGE_SIZE; |
|
for (bio = blist; bio ; bio = bio->bi_next) { |
|
/* |
|
* won't fail because the vec table is big enough |
|
* to hold all these pages |
|
*/ |
|
bio_add_page(bio, page, len, 0); |
|
} |
|
sector_nr += len >> 9; |
|
nr_sectors += len >> 9; |
|
} |
|
rcu_read_unlock(); |
|
r10_bio->sectors = nr_sectors; |
|
|
|
/* Now submit the read */ |
|
md_sync_acct_bio(read_bio, r10_bio->sectors); |
|
atomic_inc(&r10_bio->remaining); |
|
read_bio->bi_next = NULL; |
|
submit_bio_noacct(read_bio); |
|
sectors_done += nr_sectors; |
|
if (sector_nr <= last) |
|
goto read_more; |
|
|
|
lower_barrier(conf); |
|
|
|
/* Now that we have done the whole section we can |
|
* update reshape_progress |
|
*/ |
|
if (mddev->reshape_backwards) |
|
conf->reshape_progress -= sectors_done; |
|
else |
|
conf->reshape_progress += sectors_done; |
|
|
|
return sectors_done; |
|
} |
|
|
|
static void end_reshape_request(struct r10bio *r10_bio); |
|
static int handle_reshape_read_error(struct mddev *mddev, |
|
struct r10bio *r10_bio); |
|
static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
|
{ |
|
/* Reshape read completed. Hopefully we have a block |
|
* to write out. |
|
* If we got a read error then we do sync 1-page reads from |
|
* elsewhere until we find the data - or give up. |
|
*/ |
|
struct r10conf *conf = mddev->private; |
|
int s; |
|
|
|
if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) |
|
if (handle_reshape_read_error(mddev, r10_bio) < 0) { |
|
/* Reshape has been aborted */ |
|
md_done_sync(mddev, r10_bio->sectors, 0); |
|
return; |
|
} |
|
|
|
/* We definitely have the data in the pages, schedule the |
|
* writes. |
|
*/ |
|
atomic_set(&r10_bio->remaining, 1); |
|
for (s = 0; s < conf->copies*2; s++) { |
|
struct bio *b; |
|
int d = r10_bio->devs[s/2].devnum; |
|
struct md_rdev *rdev; |
|
rcu_read_lock(); |
|
if (s&1) { |
|
rdev = rcu_dereference(conf->mirrors[d].replacement); |
|
b = r10_bio->devs[s/2].repl_bio; |
|
} else { |
|
rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
b = r10_bio->devs[s/2].bio; |
|
} |
|
if (!rdev || test_bit(Faulty, &rdev->flags)) { |
|
rcu_read_unlock(); |
|
continue; |
|
} |
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
md_sync_acct_bio(b, r10_bio->sectors); |
|
atomic_inc(&r10_bio->remaining); |
|
b->bi_next = NULL; |
|
submit_bio_noacct(b); |
|
} |
|
end_reshape_request(r10_bio); |
|
} |
|
|
|
static void end_reshape(struct r10conf *conf) |
|
{ |
|
if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) |
|
return; |
|
|
|
spin_lock_irq(&conf->device_lock); |
|
conf->prev = conf->geo; |
|
md_finish_reshape(conf->mddev); |
|
smp_wmb(); |
|
conf->reshape_progress = MaxSector; |
|
conf->reshape_safe = MaxSector; |
|
spin_unlock_irq(&conf->device_lock); |
|
|
|
if (conf->mddev->queue) |
|
raid10_set_io_opt(conf); |
|
conf->fullsync = 0; |
|
} |
|
|
|
static void raid10_update_reshape_pos(struct mddev *mddev) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
sector_t lo, hi; |
|
|
|
md_cluster_ops->resync_info_get(mddev, &lo, &hi); |
|
if (((mddev->reshape_position <= hi) && (mddev->reshape_position >= lo)) |
|
|| mddev->reshape_position == MaxSector) |
|
conf->reshape_progress = mddev->reshape_position; |
|
else |
|
WARN_ON_ONCE(1); |
|
} |
|
|
|
static int handle_reshape_read_error(struct mddev *mddev, |
|
struct r10bio *r10_bio) |
|
{ |
|
/* Use sync reads to get the blocks from somewhere else */ |
|
int sectors = r10_bio->sectors; |
|
struct r10conf *conf = mddev->private; |
|
struct r10bio *r10b; |
|
int slot = 0; |
|
int idx = 0; |
|
struct page **pages; |
|
|
|
r10b = kmalloc(struct_size(r10b, devs, conf->copies), GFP_NOIO); |
|
if (!r10b) { |
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
|
return -ENOMEM; |
|
} |
|
|
|
/* reshape IOs share pages from .devs[0].bio */ |
|
pages = get_resync_pages(r10_bio->devs[0].bio)->pages; |
|
|
|
r10b->sector = r10_bio->sector; |
|
__raid10_find_phys(&conf->prev, r10b); |
|
|
|
while (sectors) { |
|
int s = sectors; |
|
int success = 0; |
|
int first_slot = slot; |
|
|
|
if (s > (PAGE_SIZE >> 9)) |
|
s = PAGE_SIZE >> 9; |
|
|
|
rcu_read_lock(); |
|
while (!success) { |
|
int d = r10b->devs[slot].devnum; |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
sector_t addr; |
|
if (rdev == NULL || |
|
test_bit(Faulty, &rdev->flags) || |
|
!test_bit(In_sync, &rdev->flags)) |
|
goto failed; |
|
|
|
addr = r10b->devs[slot].addr + idx * PAGE_SIZE; |
|
atomic_inc(&rdev->nr_pending); |
|
rcu_read_unlock(); |
|
success = sync_page_io(rdev, |
|
addr, |
|
s << 9, |
|
pages[idx], |
|
REQ_OP_READ, 0, false); |
|
rdev_dec_pending(rdev, mddev); |
|
rcu_read_lock(); |
|
if (success) |
|
break; |
|
failed: |
|
slot++; |
|
if (slot >= conf->copies) |
|
slot = 0; |
|
if (slot == first_slot) |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
if (!success) { |
|
/* couldn't read this block, must give up */ |
|
set_bit(MD_RECOVERY_INTR, |
|
&mddev->recovery); |
|
kfree(r10b); |
|
return -EIO; |
|
} |
|
sectors -= s; |
|
idx++; |
|
} |
|
kfree(r10b); |
|
return 0; |
|
} |
|
|
|
static void end_reshape_write(struct bio *bio) |
|
{ |
|
struct r10bio *r10_bio = get_resync_r10bio(bio); |
|
struct mddev *mddev = r10_bio->mddev; |
|
struct r10conf *conf = mddev->private; |
|
int d; |
|
int slot; |
|
int repl; |
|
struct md_rdev *rdev = NULL; |
|
|
|
d = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
|
if (repl) |
|
rdev = conf->mirrors[d].replacement; |
|
if (!rdev) { |
|
smp_mb(); |
|
rdev = conf->mirrors[d].rdev; |
|
} |
|
|
|
if (bio->bi_status) { |
|
/* FIXME should record badblock */ |
|
md_error(mddev, rdev); |
|
} |
|
|
|
rdev_dec_pending(rdev, mddev); |
|
end_reshape_request(r10_bio); |
|
} |
|
|
|
static void end_reshape_request(struct r10bio *r10_bio) |
|
{ |
|
if (!atomic_dec_and_test(&r10_bio->remaining)) |
|
return; |
|
md_done_sync(r10_bio->mddev, r10_bio->sectors, 1); |
|
bio_put(r10_bio->master_bio); |
|
put_buf(r10_bio); |
|
} |
|
|
|
static void raid10_finish_reshape(struct mddev *mddev) |
|
{ |
|
struct r10conf *conf = mddev->private; |
|
|
|
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
|
return; |
|
|
|
if (mddev->delta_disks > 0) { |
|
if (mddev->recovery_cp > mddev->resync_max_sectors) { |
|
mddev->recovery_cp = mddev->resync_max_sectors; |
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
|
} |
|
mddev->resync_max_sectors = mddev->array_sectors; |
|
} else { |
|
int d; |
|
rcu_read_lock(); |
|
for (d = conf->geo.raid_disks ; |
|
d < conf->geo.raid_disks - mddev->delta_disks; |
|
d++) { |
|
struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
|
if (rdev) |
|
clear_bit(In_sync, &rdev->flags); |
|
rdev = rcu_dereference(conf->mirrors[d].replacement); |
|
if (rdev) |
|
clear_bit(In_sync, &rdev->flags); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
mddev->layout = mddev->new_layout; |
|
mddev->chunk_sectors = 1 << conf->geo.chunk_shift; |
|
mddev->reshape_position = MaxSector; |
|
mddev->delta_disks = 0; |
|
mddev->reshape_backwards = 0; |
|
} |
|
|
|
static struct md_personality raid10_personality = |
|
{ |
|
.name = "raid10", |
|
.level = 10, |
|
.owner = THIS_MODULE, |
|
.make_request = raid10_make_request, |
|
.run = raid10_run, |
|
.free = raid10_free, |
|
.status = raid10_status, |
|
.error_handler = raid10_error, |
|
.hot_add_disk = raid10_add_disk, |
|
.hot_remove_disk= raid10_remove_disk, |
|
.spare_active = raid10_spare_active, |
|
.sync_request = raid10_sync_request, |
|
.quiesce = raid10_quiesce, |
|
.size = raid10_size, |
|
.resize = raid10_resize, |
|
.takeover = raid10_takeover, |
|
.check_reshape = raid10_check_reshape, |
|
.start_reshape = raid10_start_reshape, |
|
.finish_reshape = raid10_finish_reshape, |
|
.update_reshape_pos = raid10_update_reshape_pos, |
|
}; |
|
|
|
static int __init raid_init(void) |
|
{ |
|
return register_md_personality(&raid10_personality); |
|
} |
|
|
|
static void raid_exit(void) |
|
{ |
|
unregister_md_personality(&raid10_personality); |
|
} |
|
|
|
module_init(raid_init); |
|
module_exit(raid_exit); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("RAID10 (striped mirror) personality for MD"); |
|
MODULE_ALIAS("md-personality-9"); /* RAID10 */ |
|
MODULE_ALIAS("md-raid10"); |
|
MODULE_ALIAS("md-level-10"); |
|
|
|
module_param(max_queued_requests, int, S_IRUGO|S_IWUSR);
|
|
|