On 2022/8/25 4:30, Jaegeuk Kim wrote:
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));
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
Reviewed-by: Chao Yu <c...@kernel.org>
Thanks,
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