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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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SPDX-License-Identifier: GPL-2.0-or-later/* * raid10.c : Multiple Devices driver for Linux * * Copyright (C) 2000-2004 Neil Brown * * RAID-10 support for md. * * Base on code in raid1.c. See raid1.c for further copyright information. */
#include <linux/slab.h>#include <linux/delay.h>#include <linux/blkdev.h>#include <linux/module.h>#include <linux/seq_file.h>#include <linux/ratelimit.h>#include <linux/kthread.h>#include <linux/raid/md_p.h>#include <trace/events/block.h>#include "md.h"
#define RAID_1_10_NAME "raid10"#include "raid10.h"#include "raid0.h"#include "md-bitmap.h"#include "md-cluster.h"
/* * 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) * far_copies (stored in second byte of layout) * far_offset (stored in bit 16 of layout ) * use_far_sets (stored in bit 17 of layout ) * use_far_sets_bugfixed (stored in bit 18 of layout ) * * 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 * near_copies from the starting device of the previous section. Thus there * are (near_copies * far_copies) of each chunk, and each is on a different * drive. near_copies and far_copies must be at least one, and their product * is at most raid_disks. * * 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 * 'use_far_sets' is true. In this case, the array's devices are grouped into * 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. * Example 'far' algorithm w/o 'use_far_sets' (each letter represents a chunk * on a device): * A B C D A B C D E * ... ... * D A B C E A B C D * Example 'far' algorithm w/ 'use_far_sets' enabled (sets illustrated w/ []'s): * [A B] [C D] [A B] [C D E] * |...| |...| |...| | ... | * [B A] [D C] [B A] [E C D] */
static void allow_barrier(struct r10conf *conf);static void lower_barrier(struct r10conf *conf);static int _enough(struct r10conf *conf, int previous, int ignore);static int enough(struct r10conf *conf, int ignore);static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *skipped);static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio);static void end_reshape_write(struct bio *bio);static void end_reshape(struct r10conf *conf);
#include "raid1-10.c"
#define NULL_CMD#define cmd_before(conf, cmd) \ do { \ write_sequnlock_irq(&(conf)->resync_lock); \ cmd; \ } while (0)#define cmd_after(conf) write_seqlock_irq(&(conf)->resync_lock)
#define wait_event_barrier_cmd(conf, cond, cmd) \ wait_event_cmd((conf)->wait_barrier, cond, cmd_before(conf, cmd), \ cmd_after(conf))
#define wait_event_barrier(conf, cond) \ wait_event_barrier_cmd(conf, cond, NULL_CMD)
/* * for resync bio, r10bio pointer can be retrieved from the per-bio * 'struct resync_pages'. */static inline struct r10bio *get_resync_r10bio(struct bio *bio){ return get_resync_pages(bio)->raid_bio;}
static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data){ 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 */ return kzalloc(size, gfp_flags);}
#define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9)/* amount of memory to reserve for resync requests */#define RESYNC_WINDOW (1024*1024)/* maximum number of concurrent requests, memory permitting */#define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE)#define CLUSTER_RESYNC_WINDOW (32 * RESYNC_WINDOW)#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. * When performing a recovery, we need 2 bios, one for read, * one for write (we recover only one drive per r10buf) * */static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data){ struct r10conf *conf = data; struct r10bio *r10_bio; struct bio *bio; int j; int nalloc, nalloc_rp; struct resync_pages *rps;
r10_bio = r10bio_pool_alloc(gfp_flags, conf); if (!r10_bio) return NULL;
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 */
/* allocate once for all bios */ if (!conf->have_replacement) nalloc_rp = nalloc; else nalloc_rp = nalloc * 2; rps = kmalloc_objs(struct resync_pages, nalloc_rp, gfp_flags); if (!rps) goto out_free_r10bio;
/* * Allocate bios. */ for (j = nalloc ; j-- ; ) { bio = bio_kmalloc(RESYNC_PAGES, gfp_flags); if (!bio) goto out_free_bio; bio_init_inline(bio, NULL, RESYNC_PAGES, 0); r10_bio->devs[j].bio = bio; if (!conf->have_replacement) continue; bio = bio_kmalloc(RESYNC_PAGES, gfp_flags); if (!bio) goto out_free_bio; bio_init_inline(bio, NULL, RESYNC_PAGES, 0); r10_bio->devs[j].repl_bio = bio; } /* * Allocate RESYNC_PAGES data pages and attach them * where needed. */ for (j = 0; j < nalloc; j++) { struct bio *rbio = r10_bio->devs[j].repl_bio; struct resync_pages *rp, *rp_repl;
rp = &rps[j]; if (rbio) rp_repl = &rps[nalloc + j];
bio = r10_bio->devs[j].bio;
if (!j || test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery)) { if (resync_alloc_pages(rp, gfp_flags)) goto out_free_pages; } else { memcpy(rp, &rps[0], sizeof(*rp)); resync_get_all_pages(rp); }
rp->raid_bio = r10_bio; bio->bi_private = rp; if (rbio) { memcpy(rp_repl, rp, sizeof(*rp)); rbio->bi_private = rp_repl; } }
return r10_bio;
out_free_pages: while (--j >= 0) resync_free_pages(&rps[j]);
j = 0;out_free_bio: for ( ; j < nalloc; j++) { if (r10_bio->devs[j].bio) bio_uninit(r10_bio->devs[j].bio); kfree(r10_bio->devs[j].bio); if (r10_bio->devs[j].repl_bio) bio_uninit(r10_bio->devs[j].repl_bio); kfree(r10_bio->devs[j].repl_bio); } kfree(rps);out_free_r10bio: rbio_pool_free(r10_bio, conf); return NULL;}
static void r10buf_pool_free(void *__r10_bio, void *data){ struct r10conf *conf = data; struct r10bio *r10bio = __r10_bio; int j; struct resync_pages *rp = NULL;
for (j = conf->copies; j--; ) { struct bio *bio = r10bio->devs[j].bio;
if (bio) { rp = get_resync_pages(bio); resync_free_pages(rp); bio_uninit(bio); kfree(bio); }
bio = r10bio->devs[j].repl_bio; if (bio) { bio_uninit(bio); kfree(bio); } }
/* resync pages array stored in the 1st bio's .bi_private */ kfree(rp);
rbio_pool_free(r10bio, conf);}
static void put_all_bios(struct r10conf *conf, struct r10bio *r10_bio){ int i;
for (i = 0; i < conf->geo.raid_disks; i++) { struct bio **bio = & r10_bio->devs[i].bio; if (!BIO_SPECIAL(*bio)) bio_put(*bio); *bio = NULL; bio = &r10_bio->devs[i].repl_bio; if (r10_bio->read_slot < 0 && !BIO_SPECIAL(*bio)) bio_put(*bio); *bio = NULL; }}
static void free_r10bio(struct r10bio *r10_bio){ struct r10conf *conf = r10_bio->mddev->private;
put_all_bios(conf, r10_bio); mempool_free(r10_bio, &conf->r10bio_pool);}
static void put_buf(struct r10bio *r10_bio){ struct r10conf *conf = r10_bio->mddev->private;
mempool_free(r10_bio, &conf->r10buf_pool);
lower_barrier(conf);}
static void wake_up_barrier(struct r10conf *conf){ if (wq_has_sleeper(&conf->wait_barrier)) wake_up(&conf->wait_barrier);}
static void reschedule_retry(struct r10bio *r10_bio){ unsigned long flags; struct mddev *mddev = r10_bio->mddev; struct r10conf *conf = mddev->private;
spin_lock_irqsave(&conf->device_lock, flags); list_add(&r10_bio->retry_list, &conf->retry_list); conf->nr_queued ++; spin_unlock_irqrestore(&conf->device_lock, flags);
/* wake up frozen array... */ wake_up(&conf->wait_barrier);
md_wakeup_thread(mddev->thread);}
/* * raid_end_bio_io() is called when we have finished servicing a mirrored * operation and are ready to return a success/failure code to the buffer * cache layer. */static void raid_end_bio_io(struct r10bio *r10_bio){ struct bio *bio = r10_bio->master_bio; struct r10conf *conf = r10_bio->mddev->private;
if (!test_and_set_bit(R10BIO_Returned, &r10_bio->state)) { if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) bio->bi_status = BLK_STS_IOERR; bio_endio(bio); }
/* * Wake up any possible resync thread that waits for the device * to go idle. */ allow_barrier(conf);
free_r10bio(r10_bio);}
/* * Update disk head position estimator based on IRQ completion info. */static inline void update_head_pos(int slot, struct r10bio *r10_bio){ struct r10conf *conf = r10_bio->mddev->private;
conf->mirrors[r10_bio->devs[slot].devnum].head_position = r10_bio->devs[slot].addr + (r10_bio->sectors);}
/* * Find the disk number which triggered given bio */static int find_bio_disk(struct r10conf *conf, struct r10bio *r10_bio, struct bio *bio, int *slotp, int *replp){ int slot; int repl = 0;
for (slot = 0; slot < conf->geo.raid_disks; slot++) { if (r10_bio->devs[slot].bio == bio) break; if (r10_bio->devs[slot].repl_bio == bio) { repl = 1; break; } }
update_head_pos(slot, r10_bio);
if (slotp) *slotp = slot; if (replp) *replp = repl; return r10_bio->devs[slot].devnum;}
static void raid10_end_read_request(struct bio *bio){ int uptodate = !bio->bi_status; struct r10bio *r10_bio = bio->bi_private; int slot; struct md_rdev *rdev; struct r10conf *conf = r10_bio->mddev->private;
slot = r10_bio->read_slot; rdev = r10_bio->devs[slot].rdev; /* * this branch is our 'one mirror IO has finished' event handler: */ update_head_pos(slot, r10_bio);
if (uptodate) { /* * 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. */ set_bit(R10BIO_Uptodate, &r10_bio->state); } else if (!raid1_should_handle_error(bio)) { uptodate = 1; } 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 * "uptodate" to mean "Don't want to retry" */ 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 */ pr_err_ratelimited("md/raid10:%s: %pg: rescheduling sector %llu\n", mdname(conf->mddev), rdev->bdev, (unsigned long long)r10_bio->sector); set_bit(R10BIO_ReadError, &r10_bio->state); reschedule_retry(r10_bio); }}
static void close_write(struct r10bio *r10_bio){ struct mddev *mddev = r10_bio->mddev;
md_write_end(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 ignore_error = !raid1_should_handle_error(bio) || (bio->bi_status && bio_op(bio) == REQ_OP_DISCARD);
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 && !ignore_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 */ 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. * * 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 (rdev_has_badblock(rdev, r10_bio->devs[slot].addr, r10_bio->sectors) && !ignore_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); 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);
if (raid1_should_read_first(conf->mddev, this_sector, sectors)) do_balance = 0;
for (slot = 0; slot < conf->copies ; slot++) { sector_t first_bad; sector_t 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 = conf->mirrors[disk].replacement; if (rdev == NULL || test_bit(Faulty, &rdev->flags) || r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) rdev = 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 = !bdev_rot(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; *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); 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); raid1_prepare_flush_writes(conf->mddev); wake_up(&conf->wait_barrier);
while (bio) { /* submit pending writes */ struct bio *next = bio->bi_next;
raid1_submit_write(bio); bio = next; cond_resched(); } 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){ write_seqlock_irq(&conf->resync_lock);
if (WARN_ON_ONCE(force && !conf->barrier)) force = false;
/* Wait until no block IO is waiting (unless 'force') */ wait_event_barrier(conf, force || !conf->nr_waiting);
/* block any new IO from starting */ WRITE_ONCE(conf->barrier, conf->barrier + 1);
/* Now wait for all pending IO to complete */ wait_event_barrier(conf, !atomic_read(&conf->nr_pending) && conf->barrier < RESYNC_DEPTH);
write_sequnlock_irq(&conf->resync_lock);}
static void lower_barrier(struct r10conf *conf){ unsigned long flags;
write_seqlock_irqsave(&conf->resync_lock, flags); WRITE_ONCE(conf->barrier, conf->barrier - 1); write_sequnlock_irqrestore(&conf->resync_lock, flags); wake_up(&conf->wait_barrier);}
static bool stop_waiting_barrier(struct r10conf *conf){ struct bio_list *bio_list = current->bio_list; struct md_thread *thread;
/* barrier is dropped */ if (!conf->barrier) return true;
/* * 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. */ if (atomic_read(&conf->nr_pending) && bio_list && (!bio_list_empty(&bio_list[0]) || !bio_list_empty(&bio_list[1]))) return true;
/* daemon thread must exist while handling io */ thread = rcu_dereference_protected(conf->mddev->thread, true); /* * move on if io is issued from raid10d(), nr_pending is not released * from original io(see handle_read_error()). All raise barrier is * blocked until this io is done. */ if (thread->tsk == current) { WARN_ON_ONCE(atomic_read(&conf->nr_pending) == 0); return true; }
return false;}
static bool wait_barrier_nolock(struct r10conf *conf){ unsigned int seq = read_seqbegin(&conf->resync_lock);
if (READ_ONCE(conf->barrier)) return false;
atomic_inc(&conf->nr_pending); if (!read_seqretry(&conf->resync_lock, seq)) return true;
if (atomic_dec_and_test(&conf->nr_pending)) wake_up_barrier(conf);
return false;}
static bool wait_barrier(struct r10conf *conf, bool nowait){ bool ret = true;
if (wait_barrier_nolock(conf)) return true;
write_seqlock_irq(&conf->resync_lock); if (conf->barrier) { /* Return false when nowait flag is set */ if (nowait) { ret = false; } else { conf->nr_waiting++; mddev_add_trace_msg(conf->mddev, "raid10 wait barrier"); wait_event_barrier(conf, stop_waiting_barrier(conf)); conf->nr_waiting--; } if (!conf->nr_waiting) wake_up(&conf->wait_barrier); } /* Only increment nr_pending when we wait */ if (ret) atomic_inc(&conf->nr_pending); write_sequnlock_irq(&conf->resync_lock); return ret;}
static void allow_barrier(struct r10conf *conf){ if ((atomic_dec_and_test(&conf->nr_pending)) || (conf->array_freeze_pending)) wake_up_barrier(conf);}
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. */ write_seqlock_irq(&conf->resync_lock); conf->array_freeze_pending++; WRITE_ONCE(conf->barrier, conf->barrier + 1); conf->nr_waiting++; wait_event_barrier_cmd(conf, atomic_read(&conf->nr_pending) == conf->nr_queued + extra, flush_pending_writes(conf)); conf->array_freeze_pending--; write_sequnlock_irq(&conf->resync_lock);}
static void unfreeze_array(struct r10conf *conf){ /* reverse the effect of the freeze */ write_seqlock_irq(&conf->resync_lock); WRITE_ONCE(conf->barrier, conf->barrier - 1); conf->nr_waiting--; wake_up(&conf->wait_barrier); write_sequnlock_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;}
static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule){ struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, cb); struct mddev *mddev = plug->cb.data; struct r10conf *conf = mddev->private; struct bio *bio;
if (from_schedule) { spin_lock_irq(&conf->device_lock); bio_list_merge(&conf->pending_bio_list, &plug->pending); spin_unlock_irq(&conf->device_lock); wake_up_barrier(conf); 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); raid1_prepare_flush_writes(mddev); wake_up_barrier(conf);
while (bio) { /* submit pending writes */ struct bio *next = bio->bi_next;
raid1_submit_write(bio); bio = next; cond_resched(); } 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 bool regular_request_wait(struct mddev *mddev, struct r10conf *conf, struct bio *bio, sector_t sectors){ /* Bail out if REQ_NOWAIT is set for the bio */ if (!wait_barrier(conf, bio->bi_opf & REQ_NOWAIT)) { bio_wouldblock_error(bio); return false; } 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) { allow_barrier(conf); if (bio->bi_opf & REQ_NOWAIT) { bio_wouldblock_error(bio); return false; } mddev_add_trace_msg(conf->mddev, "raid10 wait reshape"); 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, false); } return true;}
static void raid10_read_request(struct mddev *mddev, struct bio *bio, struct r10bio *r10_bio){ struct r10conf *conf = mddev->private; struct bio *read_bio; int max_sectors; struct md_rdev *rdev; char b[BDEVNAME_SIZE]; int slot = r10_bio->read_slot; struct md_rdev *err_rdev = NULL;
/* * An md cloned bio indicates we are in the error path. * This is more reliable than checking slot, which might * be -1 even in the error path if a failed bio was split. */ bool err_path = md_cloned_bio(mddev, bio);
/* * If we are in the error path, we are blocking the raid10d * thread so there is a tiny risk of deadlock. So ask for * emergency memory if needed. */ gfp_t gfp = err_path ? (GFP_NOIO | __GFP_HIGH) : 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;
disk = r10_bio->devs[slot].devnum; err_rdev = conf->mirrors[disk].rdev; if (err_rdev) snprintf(b, sizeof(b), "%pg", err_rdev->bdev); else { strcpy(b, "???"); /* This never gets dereferenced */ err_rdev = r10_bio->devs[slot].rdev; } }
if (!regular_request_wait(mddev, conf, bio, r10_bio->sectors)) { free_r10bio(r10_bio); return; }
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: %pg: redirecting sector %llu to another mirror\n", mdname(mddev), rdev->bdev, (unsigned long long)r10_bio->sector); if (max_sectors < bio_sectors(bio)) { allow_barrier(conf); bio = bio_submit_split_bioset(bio, max_sectors, &conf->bio_split); wait_barrier(conf, false); if (!bio) { set_bit(R10BIO_Returned, &r10_bio->state); goto err_handle; }
r10_bio->master_bio = bio; r10_bio->sectors = max_sectors; } slot = r10_bio->read_slot;
if (likely(!md_cloned_bio(mddev, bio))) { md_account_bio(mddev, &bio); r10_bio->master_bio = bio; } read_bio = bio_alloc_clone(rdev->bdev, bio, gfp, &mddev->bio_set); read_bio->bi_opf &= ~REQ_NOWAIT;
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); read_bio->bi_end_io = raid10_end_read_request; 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; mddev_trace_remap(mddev, read_bio, r10_bio->sector); submit_bio_noacct(read_bio); return;err_handle: atomic_dec(&rdev->nr_pending); raid_end_bio_io(r10_bio);}
static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio, struct bio *bio, bool replacement, int n_copy){ unsigned long flags; struct r10conf *conf = mddev->private; struct md_rdev *rdev; int devnum = r10_bio->devs[n_copy].devnum; struct bio *mbio;
rdev = replacement ? conf->mirrors[devnum].replacement : conf->mirrors[devnum].rdev;
mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO, &mddev->bio_set); mbio->bi_opf &= ~REQ_NOWAIT; 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)); mbio->bi_end_io = raid10_end_write_request; if (!replacement && test_bit(FailFast, &conf->mirrors[devnum].rdev->flags) && enough(conf, devnum)) mbio->bi_opf |= MD_FAILFAST; mbio->bi_private = r10_bio; mddev_trace_remap(mddev, mbio, r10_bio->sector); /* flush_pending_writes() needs access to the rdev so...*/ mbio->bi_bdev = (void *)rdev;
atomic_inc(&r10_bio->remaining);
if (!raid1_add_bio_to_plug(mddev, mbio, raid10_unplug, conf->copies)) { spin_lock_irqsave(&conf->device_lock, flags); bio_list_add(&conf->pending_bio_list, mbio); spin_unlock_irqrestore(&conf->device_lock, flags); md_wakeup_thread(mddev->thread); }}
static void wait_blocked_dev(struct mddev *mddev, struct r10bio *r10_bio){ struct r10conf *conf = mddev->private; struct md_rdev *blocked_rdev; int i;
retry_wait: blocked_rdev = NULL; for (i = 0; i < conf->copies; i++) { struct md_rdev *rdev, *rrdev;
rdev = conf->mirrors[i].rdev; if (rdev) { sector_t dev_sector = r10_bio->devs[i].addr;
/* * Discard request doesn't care the write result * so it doesn't need to wait blocked disk here. */ if (test_bit(WriteErrorSeen, &rdev->flags) && r10_bio->sectors && rdev_has_badblock(rdev, dev_sector, r10_bio->sectors) < 0) /* * Mustn't write here until the bad * block is acknowledged */ set_bit(BlockedBadBlocks, &rdev->flags);
if (rdev_blocked(rdev)) { blocked_rdev = rdev; atomic_inc(&rdev->nr_pending); break; } }
rrdev = conf->mirrors[i].replacement; if (rrdev && rdev_blocked(rrdev)) { atomic_inc(&rrdev->nr_pending); blocked_rdev = rrdev; break; } }
if (unlikely(blocked_rdev)) { /* Have to wait for this device to get unblocked, then retry */ allow_barrier(conf); mddev_add_trace_msg(conf->mddev, "raid10 %s wait rdev %d blocked", __func__, blocked_rdev->raid_disk); md_wait_for_blocked_rdev(blocked_rdev, mddev); wait_barrier(conf, false); goto retry_wait; }}
static bool raid10_write_request(struct mddev *mddev, struct bio *bio, struct r10bio *r10_bio){ struct r10conf *conf = mddev->private; int i, k; sector_t sectors; int max_sectors;
if ((mddev_is_clustered(mddev) && mddev->cluster_ops->area_resyncing(mddev, WRITE, bio->bi_iter.bi_sector, bio_end_sector(bio)))) { DEFINE_WAIT(w); /* Bail out if REQ_NOWAIT is set for the bio */ if (bio->bi_opf & REQ_NOWAIT) { bio_wouldblock_error(bio); return false; } for (;;) { prepare_to_wait(&conf->wait_barrier, &w, TASK_IDLE); if (!mddev->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; if (!regular_request_wait(mddev, conf, bio, sectors)) { free_r10bio(r10_bio); return false; }
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); if (bio->bi_opf & REQ_NOWAIT) { allow_barrier(conf); bio_wouldblock_error(bio); return false; } mddev_add_trace_msg(conf->mddev, "raid10 wait reshape metadata"); wait_event(mddev->sb_wait, !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
conf->reshape_safe = mddev->reshape_position; }
/* 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);
max_sectors = r10_bio->sectors;
for (i = 0; i < conf->copies; i++) { int d = r10_bio->devs[i].devnum; struct md_rdev *rdev, *rrdev;
rdev = conf->mirrors[d].rdev; rrdev = conf->mirrors[d].replacement; 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) continue; if (rdev && test_bit(WriteErrorSeen, &rdev->flags)) { sector_t first_bad; sector_t dev_sector = r10_bio->devs[i].addr; sector_t 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; continue; } if (is_bad) { int good_sectors;
/* * We cannot atomically write this, so just * error in that case. It could be possible to * atomically write other mirrors, but the * complexity of supporting that is not worth * the benefit. */ if (bio->bi_opf & REQ_ATOMIC) goto err_handle;
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); } }
if (max_sectors < r10_bio->sectors) r10_bio->sectors = max_sectors;
if (r10_bio->sectors < bio_sectors(bio)) { allow_barrier(conf); bio = bio_submit_split_bioset(bio, r10_bio->sectors, &conf->bio_split); wait_barrier(conf, false); if (!bio) { set_bit(R10BIO_Returned, &r10_bio->state); goto err_handle; }
r10_bio->master_bio = bio; }
md_account_bio(mddev, &bio); r10_bio->master_bio = bio; atomic_set(&r10_bio->remaining, 1);
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); return true;
err_handle: for (k = 0; k < i; k++) { int d = r10_bio->devs[k].devnum; struct md_rdev *rdev = conf->mirrors[d].rdev; struct md_rdev *rrdev = conf->mirrors[d].replacement;
if (r10_bio->devs[k].bio) { rdev_dec_pending(rdev, mddev); r10_bio->devs[k].bio = NULL; } if (r10_bio->devs[k].repl_bio) { rdev_dec_pending(rrdev, mddev); r10_bio->devs[k].repl_bio = NULL; } }
raid_end_bio_io(r10_bio); return false;}
static bool __make_request(struct mddev *mddev, struct bio *bio, int sectors){ bool ret; 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);
ret = true; if (bio_data_dir(bio) == READ) raid10_read_request(mddev, bio, r10_bio); else ret = raid10_write_request(mddev, bio, r10_bio);
return ret;}
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); rdev = repl ? conf->mirrors[dev].replacement : 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;
if (!wait_barrier(conf, bio->bi_opf & REQ_NOWAIT)) { bio_wouldblock_error(bio); md_write_end(mddev); return 0; }
/* * 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); if (IS_ERR(split)) { bio->bi_status = errno_to_blk_status(PTR_ERR(split)); bio_endio(bio); md_write_end(mddev); allow_barrier(conf); return 0; }
bio_chain(split, bio); trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); /* Resend the fist split part */ submit_bio_noacct(split); wait_barrier(conf, false); } 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); if (IS_ERR(split)) { bio->bi_status = errno_to_blk_status(PTR_ERR(split)); bio_endio(bio); md_write_end(mddev); allow_barrier(conf); return 0; }
bio_chain(split, bio); trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); /* Resend the second split part */ submit_bio_noacct(bio); bio = split; wait_barrier(conf, false); }
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; r10_bio->read_slot = -1; 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) { md_account_bio(mddev, &bio); 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 */ for (disk = 0; disk < geo->raid_disks; disk++) { struct md_rdev *rdev, *rrdev;
rdev = conf->mirrors[disk].rdev; rrdev = 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); } }
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_alloc_clone(bio->bi_bdev, 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_alloc_clone(bio->bi_bdev, 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, false); 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;
md_write_start(mddev, bio);
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)); if (!__make_request(mddev, bio, sectors)) md_write_end(mddev);
/* In case raid10d snuck in to freeze_array */ wake_up_barrier(conf); return true;}
static void raid10_status(struct seq_file *seq, struct mddev *mddev){ struct r10conf *conf = mddev->private; int i;
lockdep_assert_held(&mddev->lock);
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); for (i = 0; i < conf->geo.raid_disks; i++) { struct md_rdev *rdev = READ_ONCE(conf->mirrors[i].rdev);
seq_printf(seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); } 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; }
do { int n = conf->copies; int cnt = 0; int this = first; while (n--) { struct md_rdev *rdev; if (this != ignore && (rdev = 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: 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);}
/** * raid10_error() - RAID10 error handler. * @mddev: affected md device. * @rdev: member device to fail. * * The routine acknowledges &rdev failure and determines new @mddev state. * If it failed, then: * - &MD_BROKEN flag is set in &mddev->flags. * Otherwise, it must be degraded: * - recovery is interrupted. * - &mddev->degraded is bumped. * * @rdev is marked as &Faulty excluding case when array is failed and * MD_FAILLAST_DEV is not set. */static void raid10_error(struct mddev *mddev, struct md_rdev *rdev){ struct r10conf *conf = mddev->private; unsigned long flags;
spin_lock_irqsave(&conf->device_lock, flags);
if (test_bit(In_sync, &rdev->flags) && !enough(conf, rdev->raid_disk)) { set_bit(MD_BROKEN, &mddev->flags);
if (!test_bit(MD_FAILLAST_DEV, &mddev->flags)) { spin_unlock_irqrestore(&conf->device_lock, flags); return; } } if (test_and_clear_bit(In_sync, &rdev->flags)) mddev->degraded++;
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 %pg, disabling device.\n" "md/raid10:%s: Operation continuing on %d devices.\n", mdname(mddev), rdev->bdev, 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);
lockdep_assert_held(&conf->mddev->reconfig_mutex); for (i = 0; i < conf->geo.raid_disks; i++) { rdev = conf->mirrors[i].rdev; if (rdev) pr_debug(" disk %d, wo:%d, o:%d, dev:%pg\n", i, !test_bit(In_sync, &rdev->flags), !test_bit(Faulty, &rdev->flags), rdev->bdev); }}
static void close_sync(struct r10conf *conf){ wait_barrier(conf, false); 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, repl_slot = -1; int first = 0; int last = conf->geo.raid_disks - 1; struct raid10_info *p;
if (mddev->resync_offset < 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 (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++) { p = &conf->mirrors[mirror]; if (p->rdev) { if (test_bit(WantReplacement, &p->rdev->flags) && p->replacement == NULL && repl_slot < 0) repl_slot = mirror; continue; }
err = mddev_stack_new_rdev(mddev, rdev); if (err) return err; p->head_position = 0; rdev->raid_disk = mirror; err = 0; if (rdev->saved_raid_disk != mirror) conf->fullsync = 1; WRITE_ONCE(p->rdev, rdev); break; }
if (err && repl_slot >= 0) { p = &conf->mirrors[repl_slot]; clear_bit(In_sync, &rdev->flags); set_bit(Replacement, &rdev->flags); rdev->raid_disk = repl_slot; err = mddev_stack_new_rdev(mddev, rdev); if (err) return err; conf->fullsync = 1; WRITE_ONCE(p->replacement, rdev); }
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;
print_conf(conf); if (unlikely(number >= mddev->raid_disks)) return 0; p = conf->mirrors + number; 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) && (!p->replacement || p->replacement == rdev) && number < conf->geo.raid_disks && enough(conf, -1)) { err = -EBUSY; goto abort; } WRITE_ONCE(*rdevp, NULL); if (p->replacement) { /* We must have just cleared 'rdev' */ WRITE_ONCE(p->rdev, p->replacement); clear_bit(Replacement, &p->replacement->flags); WRITE_ONCE(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); 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; 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 (rdev_has_badblock(rdev, r10_bio->devs[slot].addr, r10_bio->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, conf->mirrors[d].rdev->bdev, REQ_OP_WRITE);
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_copy_data(tbio, fbio);
atomic_inc(&conf->mirrors[d].rdev->nr_pending); atomic_inc(&r10_bio->remaining);
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; submit_bio_noacct(tbio); }
/* Now write out to any replacement devices * that are active */ for (i = 0; i < conf->copies; i++) { 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); atomic_inc(&r10_bio->remaining); submit_bio_noacct(tbio); }
done: if (atomic_dec_and_test(&r10_bio->remaining)) { md_done_sync(mddev, r10_bio->sectors); 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, 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, 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));
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 = r10_bio->devs[1].bio; struct 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 (!test_bit(R10BIO_Uptodate, &r10_bio->state)) { fix_recovery_read_error(r10_bio); if (wbio->bi_end_io) end_sync_request(r10_bio); if (wbio2) end_sync_request(r10_bio); return; }
/* * share the pages with the first bio * and submit the write request */ d = r10_bio->devs[1].devnum; if (wbio->bi_end_io) { atomic_inc(&conf->mirrors[d].rdev->nr_pending); submit_bio_noacct(wbio); } if (wbio2) { atomic_inc(&conf->mirrors[d].replacement->nr_pending); submit_bio_noacct(wbio2); }}
static int r10_sync_page_io(struct md_rdev *rdev, sector_t sector, int sectors, struct page *page, enum req_op op){ if (rdev_has_badblock(rdev, sector, sectors) && (op == REQ_OP_READ || test_bit(WriteErrorSeen, &rdev->flags))) return -1; if (sync_page_io(rdev, sector, sectors << 9, page, op, false)) /* success */ return 1; if (op == REQ_OP_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 */ rdev_set_badblocks(rdev, sector, sectors, 0); 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, slot = r10_bio->read_slot; struct md_rdev *rdev; int d = r10_bio->devs[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;
if (exceed_read_errors(mddev, rdev)) { r10_bio->devs[slot].bio = IO_BLOCKED; return; }
while(sectors) { int s = sectors; int sl = slot; int success = 0; int start;
if (s > (PAGE_SIZE>>9)) s = PAGE_SIZE >> 9;
do { d = r10_bio->devs[sl].devnum; rdev = conf->mirrors[d].rdev; if (rdev && test_bit(In_sync, &rdev->flags) && !test_bit(Faulty, &rdev->flags) && rdev_has_badblock(rdev, r10_bio->devs[sl].addr + sect, s) == 0) { atomic_inc(&rdev->nr_pending); success = sync_page_io(rdev, r10_bio->devs[sl].addr + sect, s<<9, conf->tmppage, REQ_OP_READ, false); rdev_dec_pending(rdev, mddev); if (success) break; } sl++; if (sl == conf->copies) sl = 0; } while (sl != slot);
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[slot].devnum; rdev = conf->mirrors[dn].rdev;
if (!rdev_set_badblocks( rdev, r10_bio->devs[slot].addr + sect, s, 0)) { r10_bio->devs[slot].bio = IO_BLOCKED; } break; }
start = sl; /* write it back and re-read */ while (sl != slot) { if (sl==0) sl = conf->copies; sl--; d = r10_bio->devs[sl].devnum; rdev = conf->mirrors[d].rdev; if (!rdev || test_bit(Faulty, &rdev->flags) || !test_bit(In_sync, &rdev->flags)) continue;
atomic_inc(&rdev->nr_pending); if (r10_sync_page_io(rdev, r10_bio->devs[sl].addr + sect, s, conf->tmppage, REQ_OP_WRITE) == 0) { /* Well, this device is dead */ pr_notice("md/raid10:%s: read correction write failed (%d sectors at %llu on %pg)\n", mdname(mddev), s, (unsigned long long)( sect + choose_data_offset(r10_bio, rdev)), rdev->bdev); pr_notice("md/raid10:%s: %pg: failing drive\n", mdname(mddev), rdev->bdev); } rdev_dec_pending(rdev, mddev); } sl = start; while (sl != slot) { if (sl==0) sl = conf->copies; sl--; d = r10_bio->devs[sl].devnum; rdev = conf->mirrors[d].rdev; if (!rdev || test_bit(Faulty, &rdev->flags) || !test_bit(In_sync, &rdev->flags)) continue;
atomic_inc(&rdev->nr_pending); switch (r10_sync_page_io(rdev, r10_bio->devs[sl].addr + sect, s, conf->tmppage, REQ_OP_READ)) { case 0: /* Well, this device is dead */ pr_notice("md/raid10:%s: unable to read back corrected sectors (%d sectors at %llu on %pg)\n", mdname(mddev), s, (unsigned long long)( sect + choose_data_offset(r10_bio, rdev)), rdev->bdev); pr_notice("md/raid10:%s: %pg: failing drive\n", mdname(mddev), rdev->bdev); break; case 1: pr_info("md/raid10:%s: read error corrected (%d sectors at %llu on %pg)\n", mdname(mddev), s, (unsigned long long)( sect + choose_data_offset(r10_bio, rdev)), rdev->bdev); atomic_add(s, &rdev->corrected_errors); }
rdev_dec_pending(rdev, mddev); }
sectors -= s; sect += s; }}
static void 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, lbs = bdev_logical_block_size(rdev->bdev) >> 9; sector_t sector; int sectors; int sect_to_write = r10_bio->sectors;
if (rdev->badblocks.shift < 0) block_sectors = lbs; else block_sectors = roundup(1 << rdev->badblocks.shift, lbs);
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_alloc_clone(rdev->bdev, 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); wbio->bi_opf = REQ_OP_WRITE;
if (submit_bio_wait(wbio) && !rdev_set_badblocks(rdev, wsector, sectors, 0)) { /* * Badblocks set failed, disk marked Faulty. * No further operations needed. */ bio_put(wbio); break; }
bio_put(wbio); sect_to_write -= sectors; sector += sectors; sectors = block_sectors; }}
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); r10_bio->state = 0; raid10_read_request(mddev, r10_bio->master_bio, r10_bio); /* * allow_barrier after re-submit to ensure no sync io * can be issued while regular io pending. */ allow_barrier(conf);}
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 rdev_set_badblocks(rdev, r10_bio->devs[m].addr, r10_bio->sectors, 0); 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 rdev_set_badblocks(rdev, r10_bio->devs[m].addr, r10_bio->sectors, 0); } 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; narrow_write_error(r10_bio, m); 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 (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, NULL, 0); bio->bi_private = rp; bio = r10bio->devs[i].repl_bio; if (bio) { rp = bio->bi_private; bio_reset(bio, NULL, 0); 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, sector_t max_sector, int *skipped){ struct r10conf *conf = mddev->private; struct r10bio *r10_bio; struct bio *biolist = NULL, *bio; sector_t nr_sectors; int i; int max_sync; sector_t sync_blocks; sector_t chunk_mask = conf->geo.chunk_mask; int page_idx = 0;
/* * Allow skipping a full rebuild for incremental assembly * of a clean array, like RAID1 does. */ if (mddev->bitmap == NULL && mddev->resync_offset == 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; }
if (!mempool_initialized(&conf->r10buf_pool)) if (init_resync(conf)) return 0;
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, mddev->curr_resync, &sync_blocks); 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, sect, &sync_blocks); } } 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. */ for (i = 0; i < conf->geo.raid_disks; i++) { struct md_rdev *rdev = conf->mirrors[i].replacement;
if (rdev) rdev->recovery_offset = MaxSector; } } conf->fullsync = 0; } if (md_bitmap_enabled(mddev, false)) mddev->bitmap_ops->close_sync(mddev); close_sync(conf); *skipped = 1; return 0; }
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) return reshape_request(mddev, sector_nr, 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++) { bool still_degraded; struct r10bio *rb2; sector_t sect; bool must_sync; int any_working; struct raid10_info *mirror = &conf->mirrors[i]; struct md_rdev *mrdev, *mreplace;
mrdev = mirror->rdev; mreplace = mirror->replacement;
if (mrdev && (test_bit(Faulty, &mrdev->flags) || test_bit(In_sync, &mrdev->flags))) mrdev = NULL; if (mreplace && test_bit(Faulty, &mreplace->flags)) mreplace = NULL;
if (!mrdev && !mreplace) continue;
still_degraded = false; /* 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. */ continue; /* 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, sect, &sync_blocks, true); 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 */ continue; } if (mrdev) atomic_inc(&mrdev->nr_pending); if (mreplace) atomic_inc(&mreplace->nr_pending);
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 */ for (j = 0; j < conf->geo.raid_disks; j++) { struct md_rdev *rdev = conf->mirrors[j].rdev;
if (rdev == NULL || test_bit(Faulty, &rdev->flags)) { still_degraded = false; break; } }
md_bitmap_start_sync(mddev, 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 = conf->mirrors[d].rdev; sector_t sector, first_bad; sector_t bad_sectors; if (!rdev || !test_bit(In_sync, &rdev->flags)) continue; /* This is where we read from */ 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; } } any_working = 1; bio = r10_bio->devs[0].bio; bio->bi_next = biolist; biolist = bio; bio->bi_end_io = end_sync_read; bio->bi_opf = REQ_OP_READ; 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 (mrdev) { bio = r10_bio->devs[1].bio; bio->bi_next = biolist; biolist = bio; bio->bi_end_io = end_sync_write; bio->bi_opf = REQ_OP_WRITE; 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 replace is not NULL, then bio * cannot be NULL as r10buf_pool_alloc will * have allocated it. */ if (!mreplace) break; bio->bi_next = biolist; biolist = bio; bio->bi_end_io = end_sync_write; bio->bi_opf = REQ_OP_WRITE; bio->bi_iter.bi_sector = to_addr + mreplace->data_offset; bio_set_dev(bio, mreplace->bdev); atomic_inc(&r10_bio->remaining); break; } 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 (mrdev && !test_bit(In_sync, &mrdev->flags)) rdev_set_badblocks( mrdev, r10_bio->devs[k].addr, max_sync, 0); if (mreplace) rdev_set_badblocks( mreplace, r10_bio->devs[k].addr, max_sync, 0); pr_warn("md/raid10:%s: cannot recovery sector %llu + %d.\n", mdname(mddev), r10_bio->devs[k].addr, max_sync); } put_buf(r10_bio); if (rb2) atomic_dec(&rb2->remaining); r10_bio = rb2; if (mrdev) rdev_dec_pending(mrdev, mddev); if (mreplace) rdev_dec_pending(mreplace, mddev); break; } if (mrdev) 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); } *skipped = 1; return max_sync; } } 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. */ if (md_bitmap_enabled(mddev, false)) mddev->bitmap_ops->cond_end_sync(mddev, sector_nr, mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high));
if (!md_bitmap_start_sync(mddev, 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; } 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; sector_t 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; rdev = conf->mirrors[d].rdev; if (rdev == NULL || test_bit(Faulty, &rdev->flags)) 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; 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->bi_opf = REQ_OP_READ; 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 = conf->mirrors[d].replacement; if (rdev == NULL || test_bit(Faulty, &rdev->flags)) 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->bi_opf = REQ_OP_WRITE; 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++; }
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); *skipped = 1; return max_sync; } }
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); if (WARN_ON(!bio_add_page(bio, page, len, 0))) { bio->bi_status = BLK_STS_RESOURCE; bio_endio(bio); *skipped = 1; return max_sync; } } 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 */ mddev->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); mddev->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) { bio->bi_status = 0; submit_bio_noacct(bio); } }
return nr_sectors;}
static sector_traid10_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); if (!nc || !fc) return -1; 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 void raid10_free_conf(struct r10conf *conf){ if (!conf) return;
mempool_exit(&conf->r10bio_pool); kfree(conf->mirrors); kfree(conf->mirrors_old); kfree(conf->mirrors_new); safe_put_page(conf->tmppage); bioset_exit(&conf->bio_split); kfree(conf);}
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_obj(struct r10conf); if (!conf) goto out;
/* FIXME calc properly */ conf->mirrors = kzalloc_objs(struct raid10_info, mddev->raid_disks + max(0, -mddev->delta_disks)); 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);
seqlock_init(&conf->resync_lock); init_waitqueue_head(&conf->wait_barrier); atomic_set(&conf->nr_pending, 0);
err = -ENOMEM; rcu_assign_pointer(conf->thread, md_register_thread(raid10d, mddev, "raid10")); if (!conf->thread) goto out;
conf->mddev = mddev; return conf;
out: raid10_free_conf(conf); return ERR_PTR(err);}
static unsigned int raid10_nr_stripes(struct r10conf *conf){ unsigned int raid_disks = conf->geo.raid_disks;
if (conf->geo.raid_disks % conf->geo.near_copies) return raid_disks; return raid_disks / conf->geo.near_copies;}
static int raid10_set_queue_limits(struct mddev *mddev){ struct r10conf *conf = mddev->private; struct queue_limits lim; int err;
md_init_stacking_limits(&lim); lim.max_write_zeroes_sectors = 0; lim.max_hw_wzeroes_unmap_sectors = 0; lim.logical_block_size = mddev->logical_block_size; lim.io_min = mddev->chunk_sectors << 9; lim.chunk_sectors = mddev->chunk_sectors; lim.io_opt = lim.io_min * raid10_nr_stripes(conf); lim.features |= BLK_FEAT_ATOMIC_WRITES; lim.features |= BLK_FEAT_PCI_P2PDMA; err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) return err; return queue_limits_set(mddev->gendisk->queue, &lim);}
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; int ret = -EIO;
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;
rcu_assign_pointer(mddev->thread, conf->thread); rcu_assign_pointer(conf->thread, NULL);
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; } }
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;
disk->head_position = 0; first = 0; }
if (!mddev_is_dm(conf->mddev)) { int err = raid10_set_queue_limits(mddev);
if (err) { ret = err; goto out_free_conf; } }
/* 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; } }
if (mddev->resync_offset != 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_NEEDED, &mddev->recovery); }
return 0;
out_free_conf: md_unregister_thread(mddev, &mddev->thread); raid10_free_conf(conf); mddev->private = NULL;out: return ret;}
static void raid10_free(struct mddev *mddev, void *priv){ raid10_free_conf(priv);}
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 (md_bitmap_enabled(mddev, false)) { int ret = mddev->bitmap_ops->resize(mddev, size, 0);
if (ret) return ret; }
md_set_array_sectors(mddev, size); if (sectors > mddev->dev_sectors && mddev->resync_offset > oldsize) { mddev->resync_offset = 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->resync_offset = 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; } }
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 = kzalloc_objs(struct raid10_info, mddev->raid_disks + mddev->delta_disks); 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;
degraded = 0; /* 'prev' section first */ for (i = 0; i < conf->prev.raid_disks; i++) { struct md_rdev *rdev = 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++; } if (conf->geo.raid_disks == conf->prev.raid_disks) return degraded; degraded2 = 0; for (i = 0; i < conf->geo.raid_disks; i++) { struct md_rdev *rdev = 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++; } } 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) && md_bitmap_enabled(mddev, false)) { ret = mddev->bitmap_ops->resize(mddev, newsize, 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 bitmap_ops->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;
/* cluster can't be setup without bitmap */ ret = mddev->bitmap_ops->resize(mddev, newsize, 0); if (ret) goto abort;
ret = mddev->cluster_ops->resize_bitmaps(mddev, newsize, oldsize); if (ret) { mddev->bitmap_ops->resize(mddev, oldsize, 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_NEEDED, &mddev->recovery); conf->reshape_checkpoint = jiffies; md_new_event(); 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, false); 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(rdev->bdev, RESYNC_PAGES, REQ_OP_READ, GFP_KERNEL, &mddev->bio_set); 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; 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; }
mddev->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;
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 = conf->mirrors[d].replacement; b = r10_bio->devs[s/2].repl_bio; } else { rdev2 = 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; b->bi_opf = REQ_OP_WRITE; 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) { if (WARN_ON(!bio_add_page(bio, page, len, 0))) { bio->bi_status = BLK_STS_RESOURCE; bio_endio(bio); return sectors_done; } } sector_nr += len >> 9; nr_sectors += len >> 9; } r10_bio->sectors = nr_sectors;
/* Now submit the read */ 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); md_sync_error(mddev); 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; if (s&1) { rdev = conf->mirrors[d].replacement; b = r10_bio->devs[s/2].repl_bio; } else { rdev = conf->mirrors[d].rdev; b = r10_bio->devs[s/2].bio; } if (!rdev || test_bit(Faulty, &rdev->flags)) continue;
atomic_inc(&rdev->nr_pending); 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);
mddev_update_io_opt(conf->mddev, raid10_nr_stripes(conf)); conf->fullsync = 0;}
static void raid10_update_reshape_pos(struct mddev *mddev){ struct r10conf *conf = mddev->private; sector_t lo, hi;
mddev->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_flex(*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;
while (!success) { int d = r10b->devs[slot].devnum; struct md_rdev *rdev = 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); success = sync_page_io(rdev, addr, s << 9, pages[idx], REQ_OP_READ, false); rdev_dec_pending(rdev, mddev); if (success) break; failed: slot++; if (slot >= conf->copies) slot = 0; if (slot == first_slot) break; } 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); rdev = repl ? conf->mirrors[d].replacement : 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); 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->resync_offset > mddev->resync_max_sectors) { mddev->resync_offset = mddev->resync_max_sectors; set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); } mddev->resync_max_sectors = mddev->array_sectors; } else { int d; for (d = conf->geo.raid_disks ; d < conf->geo.raid_disks - mddev->delta_disks; d++) { struct md_rdev *rdev = conf->mirrors[d].rdev; if (rdev) clear_bit(In_sync, &rdev->flags); rdev = conf->mirrors[d].replacement; if (rdev) clear_bit(In_sync, &rdev->flags); } } 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 ={ .head = { .type = MD_PERSONALITY, .id = ID_RAID10, .name = "raid10", .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 raid10_init(void){ return register_md_submodule(&raid10_personality.head);}
static void __exit raid10_exit(void){ unregister_md_submodule(&raid10_personality.head);}
module_init(raid10_init);module_exit(raid10_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");