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| author | Song Liu <song@kernel.org> | 2024-01-25 09:21:31 +0100 |
|---|---|---|
| committer | Song Liu <song@kernel.org> | 2024-03-05 21:52:59 +0100 |
| commit | 3445139e3a594be77eff48bc17eff67cf983daed (patch) | |
| tree | 8d679b33560a96c7035967b53472b2b3547f8560 | |
| parent | nbd: use the atomic queue limits API in nbd_set_size (diff) | |
| download | linux-3445139e3a594be77eff48bc17eff67cf983daed.tar.xz linux-3445139e3a594be77eff48bc17eff67cf983daed.zip | |
Revert "Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d""
This reverts commit bed9e27baf52a09b7ba2a3714f1e24e17ced386d.
The original set [1][2] was expected to undo a suboptimal fix in [2], and
replace it with a better fix [1]. However, as reported by Dan Moulding [2]
causes an issue with raid5 with journal device.
Revert [2] for now to close the issue. We will follow up on another issue
reported by Juxiao Bi, as [2] is expected to fix it. We believe this is a
good trade-off, because the latter issue happens less freqently.
In the meanwhile, we will NOT revert [1], as it contains the right logic.
[1] commit d6e035aad6c0 ("md: bypass block throttle for superblock update")
[2] commit bed9e27baf52 ("Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d"")
Reported-by: Dan Moulding <dan@danm.net>
Closes: https://lore.kernel.org/linux-raid/20240123005700.9302-1-dan@danm.net/
Fixes: bed9e27baf52 ("Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d"")
Cc: stable@vger.kernel.org # v5.19+
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240125082131.788600-1-song@kernel.org
| -rw-r--r-- | drivers/md/raid5.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 48129de21aec..51a591c7628b 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -36,6 +36,7 @@ */ #include <linux/blkdev.h> +#include <linux/delay.h> #include <linux/kthread.h> #include <linux/raid/pq.h> #include <linux/async_tx.h> @@ -6764,7 +6765,18 @@ static void raid5d(struct md_thread *thread) spin_unlock_irq(&conf->device_lock); md_check_recovery(mddev); spin_lock_irq(&conf->device_lock); + + /* + * Waiting on MD_SB_CHANGE_PENDING below may deadlock + * seeing md_check_recovery() is needed to clear + * the flag when using mdmon. + */ + continue; } + + wait_event_lock_irq(mddev->sb_wait, + !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), + conf->device_lock); } pr_debug("%d stripes handled\n", handled); |