On 07/09, Chao Yu wrote:
> On 2018/7/7 9:20, Jaegeuk Kim wrote:
> > When unmounting f2fs in force mode, we can get it stuck by io_schedule()
>
> force mode means force shutdown?
Yes.
>
> > by some pending IOs in meta_inode.
> >
> > io_schedule+0xd/0x30
> > wait_on_page_bit_common+0xc6/0x130
>
> Looks like a deadlock here? Does this mean we forget to submit cached bio in
> somewhere?
I'm hitting this randomly, when running all the testcases in xfstests.
I can't find the missing flow, and only get this during kill_sb.
>
> Thanks,
>
> > __filemap_fdatawait_range+0xbd/0x100
> > filemap_fdatawait_keep_errors+0x15/0x40
> > sync_inodes_sb+0x1cf/0x240
> > sync_filesystem+0x52/0x90
> > generic_shutdown_super+0x1d/0x110
> > ceph_kill_sb+0x28/0x80 [ceph]
> > deactivate_locked_super+0x35/0x60
> > cleanup_mnt+0x36/0x70
> > task_work_run+0x79/0xa0
> > exit_to_usermode_loop+0x62/0x70
> > do_syscall_64+0xdb/0xf0
> > entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > 0xffffffffffffffff
> >
> > Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
> > ---
> > fs/f2fs/super.c | 16 +++++++++++++---
> > 1 file changed, 13 insertions(+), 3 deletions(-)
> >
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index 3995e926ba3a..1dc6809fac38 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -3089,9 +3089,19 @@ static struct dentry *f2fs_mount(struct
> > file_system_type *fs_type, int flags,
> > static void kill_f2fs_super(struct super_block *sb)
> > {
> > if (sb->s_root) {
> > - set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
> > - f2fs_stop_gc_thread(F2FS_SB(sb));
> > - f2fs_stop_discard_thread(F2FS_SB(sb));
> > + struct f2fs_sb_info *sbi = F2FS_SB(sb);
> > +
> > + set_sbi_flag(sbi, SBI_IS_CLOSE);
> > + f2fs_stop_gc_thread(sbi);
> > + f2fs_stop_discard_thread(sbi);
> > +
> > + if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
> > + !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
> > + struct cp_control cpc = {
> > + .reason = CP_UMOUNT,
> > + };
> > + f2fs_write_checkpoint(sbi, &cpc);
> > + }
> > }
> > kill_block_super(sb);
> > }
> >
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