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ext4: clear mmp sequence number when remounting read-only

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[ Upstream commit 2dca60d98e241bea686004168f85208f215fc697 ]

Previously, when an MMP-protected file system is remounted read-only,
the kmmpd thread would exit the next time it woke up (a few seconds
later), without resetting the MMP sequence number back to
EXT4_MMP_SEQ_CLEAN.

Fix this by explicitly killing the MMP thread when the file system is
remounted read-only.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Theodore Ts'o 2018-07-08 19:36:02 -04:00 committed by Greg Kroah-Hartman
parent de044d4ecc
commit 147b89c421
2 changed files with 4 additions and 5 deletions
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7
fs/ext4/mmp.c
View File

@ -186,11 +186,8 @@ static int kmmpd(void *data)
goto exit_thread;
}
if (sb_rdonly(sb)) {
ext4_warning(sb, "kmmpd being stopped since filesystem "
"has been remounted as readonly.");
goto exit_thread;
}
if (sb_rdonly(sb))
break;
diff = jiffies - last_update_time;
if (diff < mmp_update_interval * HZ)

2
fs/ext4/super.c
View File

@ -5163,6 +5163,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
if (sbi->s_journal)
ext4_mark_recovery_complete(sb, es);
if (sbi->s_mmp_tsk)
kthread_stop(sbi->s_mmp_tsk);
} else {
/* Make sure we can mount this feature set readwrite */
if (ext4_has_feature_readonly(sb) ||