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Bugfixes for md/raid1

Browse source 
particularly, but not only, fixing new "resync" code.
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Merge tag 'md/3.17-more-fixes' of git://git.neil.brown.name/md

Pull bugfixes for md/raid1 from Neil Brown:
 "It is amazing how much easier it is to find bugs when you know one is
  there.  Two bug reports resulted in finding 7 bugs!

  All are tagged for -stable.  Those that can't cause (rare) data
  corruption, cause lockups.

  Particularly, but not only, fixing new "resync" code"

* tag 'md/3.17-more-fixes' of git://git.neil.brown.name/md:
  md/raid1: fix_read_error should act on all non-faulty devices.
  md/raid1: count resync requests in nr_pending.
  md/raid1: update next_resync under resync_lock.
  md/raid1: Don't use next_resync to determine how far resync has progressed
  md/raid1: make sure resync waits for conflicting writes to complete.
  md/raid1: clean up request counts properly in close_sync()
  md/raid1:  be more cautious where we read-balance during resync.
  md/raid1: intialise start_next_window for READ case to avoid hang
This commit is contained in:
Linus Torvalds 2014-09-24 08:53:33 -07:00
commit a90e41e228
1 changed files with 22 additions and 18 deletions
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40
drivers/md/raid1.c
View file

@ -540,11 +540,7 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
has_nonrot_disk = 0;
choose_next_idle = 0;
if (conf->mddev->recovery_cp < MaxSector &&
(this_sector + sectors >= conf->next_resync))
choose_first = 1;
else
choose_first = 0;
choose_first = (conf->mddev->recovery_cp < this_sector + sectors);
for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {
sector_t dist;
@ -831,7 +827,7 @@ static void flush_pending_writes(struct r1conf *conf)
* there is no normal IO happeing. It must arrange to call
* lower_barrier when the particular background IO completes.
*/
static void raise_barrier(struct r1conf *conf)
static void raise_barrier(struct r1conf *conf, sector_t sector_nr)
{
spin_lock_irq(&conf->resync_lock);
@ -841,6 +837,7 @@ static void raise_barrier(struct r1conf *conf)
/* block any new IO from starting */
conf->barrier++;
conf->next_resync = sector_nr;
/* For these conditions we must wait:
* A: while the array is in frozen state
@ -849,14 +846,17 @@ static void raise_barrier(struct r1conf *conf)
* C: next_resync + RESYNC_SECTORS > start_next_window, meaning
* next resync will reach to the window which normal bios are
* handling.
* D: while there are any active requests in the current window.
*/
wait_event_lock_irq(conf->wait_barrier,
!conf->array_frozen &&
conf->barrier < RESYNC_DEPTH &&
conf->current_window_requests == 0 &&
(conf->start_next_window >=
conf->next_resync + RESYNC_SECTORS),
conf->resync_lock);
conf->nr_pending++;
spin_unlock_irq(&conf->resync_lock);
}
@ -866,6 +866,7 @@ static void lower_barrier(struct r1conf *conf)
BUG_ON(conf->barrier <= 0);
spin_lock_irqsave(&conf->resync_lock, flags);
conf->barrier--;
conf->nr_pending--;
spin_unlock_irqrestore(&conf->resync_lock, flags);
wake_up(&conf->wait_barrier);
}
@ -877,12 +878,10 @@ static bool need_to_wait_for_sync(struct r1conf *conf, struct bio *bio)
if (conf->array_frozen || !bio)
wait = true;
else if (conf->barrier && bio_data_dir(bio) == WRITE) {
if (conf->next_resync < RESYNC_WINDOW_SECTORS)
wait = true;
else if ((conf->next_resync - RESYNC_WINDOW_SECTORS
>= bio_end_sector(bio)) ||
(conf->next_resync + NEXT_NORMALIO_DISTANCE
<= bio->bi_iter.bi_sector))
if ((conf->mddev->curr_resync_completed
>= bio_end_sector(bio)) ||
(conf->next_resync + NEXT_NORMALIO_DISTANCE
<= bio->bi_iter.bi_sector))
wait = false;
else
wait = true;
@ -919,8 +918,8 @@ static sector_t wait_barrier(struct r1conf *conf, struct bio *bio)
}
if (bio && bio_data_dir(bio) == WRITE) {
if (conf->next_resync + NEXT_NORMALIO_DISTANCE
<= bio->bi_iter.bi_sector) {
if (bio->bi_iter.bi_sector >=
conf->mddev->curr_resync_completed) {
if (conf->start_next_window == MaxSector)
conf->start_next_window =
conf->next_resync +
@ -1186,6 +1185,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
atomic_read(&bitmap->behind_writes) == 0);
}
r1_bio->read_disk = rdisk;
r1_bio->start_next_window = 0;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector,
@ -1548,8 +1548,13 @@ static void close_sync(struct r1conf *conf)
mempool_destroy(conf->r1buf_pool);
conf->r1buf_pool = NULL;
spin_lock_irq(&conf->resync_lock);
conf->next_resync = 0;
conf->start_next_window = MaxSector;
conf->current_window_requests +=
conf->next_window_requests;
conf->next_window_requests = 0;
spin_unlock_irq(&conf->resync_lock);
}
static int raid1_spare_active(struct mddev *mddev)
@ -2150,7 +2155,7 @@ static void fix_read_error(struct r1conf *conf, int read_disk,
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags))
!test_bit(Faulty, &rdev->flags))
r1_sync_page_io(rdev, sect, s,
conf->tmppage, WRITE);
}
@ -2162,7 +2167,7 @@ static void fix_read_error(struct r1conf *conf, int read_disk,
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags)) {
!test_bit(Faulty, &rdev->flags)) {
if (r1_sync_page_io(rdev, sect, s,
conf->tmppage, READ)) {
atomic_add(s, &rdev->corrected_errors);
@ -2541,9 +2546,8 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
bitmap_cond_end_sync(mddev->bitmap, sector_nr);
r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO);
raise_barrier(conf);
conf->next_resync = sector_nr;
raise_barrier(conf, sector_nr);
rcu_read_lock();
/*