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Date: Thu, 24 Jan 2019 16:52:15 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <yuchao0@...wei.com>
Cc: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: sync filesystem after roll-forward
recovery
On 01/24, Chao Yu wrote:
> On 2019/1/23 8:02, Jaegeuk Kim wrote:
> > Some works after roll-forward recovery can get an error which will release
> > all the data structures. Let's flush them in order to make it clean.
> >
> > One possible corruption came from:
> >
> > [ 90.400500] list_del corruption. prev->next should be ffffffed1f566208, but was (null)
> > [ 90.675349] Call trace:
> > [ 90.677869] __list_del_entry_valid+0x94/0xb4
> > [ 90.682351] remove_dirty_inode+0xac/0x114
> > [ 90.686563] __f2fs_write_data_pages+0x6a8/0x6c8
> > [ 90.691302] f2fs_write_data_pages+0x40/0x4c
> > [ 90.695695] do_writepages+0x80/0xf0
> > [ 90.699372] __writeback_single_inode+0xdc/0x4ac
> > [ 90.704113] writeback_sb_inodes+0x280/0x440
> > [ 90.708501] wb_writeback+0x1b8/0x3d0
> > [ 90.712267] wb_workfn+0x1a8/0x4d4
> > [ 90.715765] process_one_work+0x1c0/0x3d4
> > [ 90.719883] worker_thread+0x224/0x344
> > [ 90.723739] kthread+0x120/0x130
> > [ 90.727055] ret_from_fork+0x10/0x18
> >
> > Reported-by: Sahitya Tummala <stummala@...eaurora.org>
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> > fs/f2fs/checkpoint.c | 5 +++--
> > fs/f2fs/node.c | 4 +++-
> > fs/f2fs/super.c | 42 +++++++++++++++++++++++++++++++-----------
> > 3 files changed, 37 insertions(+), 14 deletions(-)
> >
> > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> > index f955cd3e0677..ccccf0ce2f06 100644
> > --- a/fs/f2fs/checkpoint.c
> > +++ b/fs/f2fs/checkpoint.c
> > @@ -306,8 +306,9 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
> > goto skip_write;
> >
> > /* collect a number of dirty meta pages and write together */
> > - if (wbc->for_kupdate ||
> > - get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
> > + if (wbc->sync_mode != WB_SYNC_ALL &&
> > + get_pages(sbi, F2FS_DIRTY_META) <
> > + nr_pages_to_skip(sbi, META))
> > goto skip_write;
> >
> > /* if locked failed, cp will flush dirty pages instead */
> > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> > index 4f450e573312..f6ff84e29749 100644
> > --- a/fs/f2fs/node.c
> > +++ b/fs/f2fs/node.c
> > @@ -1920,7 +1920,9 @@ static int f2fs_write_node_pages(struct address_space *mapping,
> > f2fs_balance_fs_bg(sbi);
> >
> > /* collect a number of dirty node pages and write together */
> > - if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
> > + if (wbc->sync_mode != WB_SYNC_ALL &&
> > + get_pages(sbi, F2FS_DIRTY_NODES) <
> > + nr_pages_to_skip(sbi, NODE))
> > goto skip_write;
> >
> > if (wbc->sync_mode == WB_SYNC_ALL)
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index 7998ff5418f2..2af0db2b738e 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -1456,9 +1456,16 @@ static int f2fs_enable_quotas(struct super_block *sb);
> >
> > static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
> > {
> > + unsigned int s_flags = sbi->sb->s_flags;
> > struct cp_control cpc;
> > - int err;
> > + int err = 0;
> > + int ret;
> >
> > + if (s_flags & SB_RDONLY) {
> > + f2fs_msg(sbi->sb, KERN_ERR,
> > + "checkpoint=disable on readonly fs");
> > + return -EINVAL;
> > + }
> > sbi->sb->s_flags |= SB_ACTIVE;
> >
> > f2fs_update_time(sbi, DISABLE_TIME);
> > @@ -1466,18 +1473,24 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
> > while (!f2fs_time_over(sbi, DISABLE_TIME)) {
> > mutex_lock(&sbi->gc_mutex);
> > err = f2fs_gc(sbi, true, false, NULL_SEGNO);
> > - if (err == -ENODATA)
> > + if (err == -ENODATA) {
> > + err = 0;
> > break;
> > + }
> > if (err && err != -EAGAIN)
> > - return err;
> > + break;
>
> Should be?
>
> if (err) {
> if (err == -EAGAIN)
> err = 0;
Have to report EAGAIN, but not for ENODATA.
> else
> break;
> }
>
> Thanks,
>
> > }
> >
> > - err = sync_filesystem(sbi->sb);
> > - if (err)
> > - return err;
> > + ret = sync_filesystem(sbi->sb);
> > + if (ret || err) {
> > + err = ret ? ret: err;
> > + goto restore_flag;
> > + }
> >
> > - if (f2fs_disable_cp_again(sbi))
> > - return -EAGAIN;
> > + if (f2fs_disable_cp_again(sbi)) {
> > + err = -EAGAIN;
> > + goto restore_flag;
> > + }
> >
> > mutex_lock(&sbi->gc_mutex);
> > cpc.reason = CP_PAUSE;
> > @@ -1486,7 +1499,9 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
> >
> > sbi->unusable_block_count = 0;
> > mutex_unlock(&sbi->gc_mutex);
> > - return 0;
> > +restore_flag:
> > + sbi->sb->s_flags = s_flags; /* Restore MS_RDONLY status */
> > + return err;
> > }
> >
> > static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
> > @@ -3356,7 +3371,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> > if (test_opt(sbi, DISABLE_CHECKPOINT)) {
> > err = f2fs_disable_checkpoint(sbi);
> > if (err)
> > - goto free_meta;
> > + goto sync_free_meta;
> > } else if (is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)) {
> > f2fs_enable_checkpoint(sbi);
> > }
> > @@ -3369,7 +3384,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> > /* After POR, we can run background GC thread.*/
> > err = f2fs_start_gc_thread(sbi);
> > if (err)
> > - goto free_meta;
> > + goto sync_free_meta;
> > }
> > kvfree(options);
> >
> > @@ -3391,6 +3406,11 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> > f2fs_update_time(sbi, REQ_TIME);
> > return 0;
> >
> > +sync_free_meta:
> > + /* safe to flush all the data */
> > + sync_filesystem(sbi->sb);
> > + retry = false;
> > +
> > free_meta:
> > #ifdef CONFIG_QUOTA
> > f2fs_truncate_quota_inode_pages(sb);
> >
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