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FROMGIT: f2fs: complete checkpoints during remount

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Otherwise, pending checkpoints can contribute a race condition to give a
quota warning.

- Thread                      - checkpoint thread
                              add checkpoints to the list
do_remount()
 down_write(&sb->s_umount);
 f2fs_remount()
                              block_operations()
                               down_read_trylock(&sb->s_umount) = 0
 up_write(&sb->s_umount);
                               f2fs_quota_sync()
                                dquot_writeback_dquots()
                                 WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount));

Or,

do_remount()
 down_write(&sb->s_umount);
 f2fs_remount()
                              create a ckpt thread
                              f2fs_enable_checkpoint() adds checkpoints
			      wait for f2fs_sync_fs()
                              trigger another pending checkpoint
                               block_operations()
                                down_read_trylock(&sb->s_umount) = 0
 up_write(&sb->s_umount);
                                f2fs_quota_sync()
                                 dquot_writeback_dquots()
                                  WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount));

Bug: 242127451
Bug: 215554521
Cc: stable@vger.kernel.org
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Change-Id: I85926fe14245058e48bac5699a7b760d7700c653
(cherry picked from commit d14393c5bff2f0c163e6bb384618300e30d19754
     https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev)
This commit is contained in:
Jaegeuk Kim
2022-08-18 22:40:09 -07:00
committed by Jaegeuk Kim
parent 1c5313a9f7
commit 42aa1955c2
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
fs/f2fs/super.c
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@@ -2028,6 +2028,9 @@ static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
f2fs_up_write(&sbi->gc_lock);
f2fs_sync_fs(sbi->sb, 1);
/* Let's ensure there's no pending checkpoint anymore */
f2fs_flush_ckpt_thread(sbi);
}
static int f2fs_remount(struct super_block *sb, int *flags, char *data)
@@ -2187,6 +2190,9 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
f2fs_stop_ckpt_thread(sbi);
need_restart_ckpt = true;
} else {
/* Flush if the prevous checkpoint, if exists. */
f2fs_flush_ckpt_thread(sbi);
err = f2fs_start_ckpt_thread(sbi);
if (err) {
f2fs_err(sbi,