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Date: Fri, 25 Jan 2019 09:38:35 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
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 2019/1/25 8:52, Jaegeuk Kim wrote:
> 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.
Oh, right. :)
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Thanks,
>
>> 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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