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charset="us-ascii"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 2024/6/6 17:52, Chao Yu wrote: > After commit 261eeb9c1585 ("f2fs: introduce checkpoint_merge mount > option"), checkpoint can be triggered in background thread, it missed > to cover f2fs inner checkpoint operation w/ sb_{start,end}_intwrite(), > fix it. It needs to use sb_start_intwrite_trylock(), otherwise, it will cause deadlock as below: - freeze_super - sb_wait_write(SB_FREEZE_WRITE) - sb_wait_write(SB_FREEZE_PAGEFAULT) - sb_wait_write(SB_FREEZE_FS) - sync - iterate_supers - super_lock_shared - down_read(&sb->s_umount) - sync_fs_one_sb - f2fs_sync_fs - f2fs_issue_checkpoint - wait_for_completion - issue_checkpoint_thread - sb_start_intwrite(sbi->sb); - thaw_super - super_lock_excl - down_write(&sb->s_umount) Thanks, > > Fixes: 261eeb9c1585 ("f2fs: introduce checkpoint_merge mount option") > Cc: Daeho Jeong > Signed-off-by: Chao Yu > --- > fs/f2fs/checkpoint.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c > index 55d444bec5c0..66eaad591b60 100644 > --- a/fs/f2fs/checkpoint.c > +++ b/fs/f2fs/checkpoint.c > @@ -1828,8 +1828,11 @@ static int issue_checkpoint_thread(void *data) > if (kthread_should_stop()) > return 0; > > - if (!llist_empty(&cprc->issue_list)) > + if (!llist_empty(&cprc->issue_list)) { > + sb_start_intwrite(sbi->sb); > __checkpoint_and_complete_reqs(sbi); > + sb_end_intwrite(sbi->sb); > + } > > wait_event_interruptible(*q, > kthread_should_stop() || !llist_empty(&cprc->issue_list)); _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel