diff options
| author | Artur Paszkiewicz <artur.paszkiewicz@intel.com> | 2017-10-26 15:56:54 +0200 |
|---|---|---|
| committer | Shaohua Li <shli@fb.com> | 2017-11-01 21:32:25 -0700 |
| commit | b90f6ff080c52e2f05364210733df120e3c4e597 (patch) | |
| tree | afff8fe455c4465c40515462cddaab911c706659 /drivers/md/md.c | |
| parent | f0e230ad877855567607fe2f40802b6317ad38f3 (diff) | |
| download | lwn-b90f6ff080c52e2f05364210733df120e3c4e597.tar.gz lwn-b90f6ff080c52e2f05364210733df120e3c4e597.zip | |
md: don't check MD_SB_CHANGE_CLEAN in md_allow_write
Only MD_SB_CHANGE_PENDING should be used to wait for transition from
clean to dirty. Checking also MD_SB_CHANGE_CLEAN is unnecessary and can
race with e.g. md_do_sync(). This sporadically causes a hang when
changing consistency policy during resync:
INFO: task mdadm:6183 blocked for more than 30 seconds.
Not tainted 4.14.0-rc3+ #391
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mdadm D12752 6183 6022 0x00000000
Call Trace:
__schedule+0x93f/0x990
schedule+0x6b/0x90
md_allow_write+0x100/0x130 [md_mod]
? do_wait_intr_irq+0x90/0x90
resize_stripes+0x3a/0x5b0 [raid456]
? kernfs_fop_write+0xbe/0x180
raid5_change_consistency_policy+0xa6/0x200 [raid456]
consistency_policy_store+0x2e/0x70 [md_mod]
md_attr_store+0x90/0xc0 [md_mod]
sysfs_kf_write+0x42/0x50
kernfs_fop_write+0x119/0x180
__vfs_write+0x28/0x110
? rcu_sync_lockdep_assert+0x12/0x60
? __sb_start_write+0x15a/0x1c0
? vfs_write+0xa3/0x1a0
vfs_write+0xb4/0x1a0
SyS_write+0x49/0xa0
entry_SYSCALL_64_fastpath+0x18/0xad
Fixes: 2214c260c72b ("md: don't return -EAGAIN in md_allow_write for external metadata arrays")
Cc: <stable@vger.kernel.org>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 5a0ec1d1a6e8..2bf4cc41b4f8 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8125,7 +8125,6 @@ void md_allow_write(struct mddev *mddev) sysfs_notify_dirent_safe(mddev->sysfs_state); /* wait for the dirty state to be recorded in the metadata */ wait_event(mddev->sb_wait, - !test_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags) && !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); } else spin_unlock(&mddev->lock); |