On 2020/5/8 14:58, Daeho Jeong wrote:
> I moved checking i_compr_blocks phrase after calling inode_lock()
> already, because we should check this after writing pages.
>
> So, if it fails to check i_compr_blocks, we need to call inode_unlock().
>
> Am I missing something?
After applying this patch, I get this:
ret = mnt_want_write_file(filp);
if (ret)
return ret;
if (!F2FS_I(inode)->i_compr_blocks)
goto out;
f2fs_balance_fs(F2FS_I_SB(inode), true);
inode_lock(inode);
>
> 2020년 5월 8일 (금) 오후 3:50, Chao Yu <yuch...@huawei.com>님이 작성:
>>
>> On 2020/5/8 12:25, Daeho Jeong wrote:
>>> From: Daeho Jeong <daehoje...@google.com>
>>>
>>> Now, if writing pages and releasing compress blocks occur
>>> simultaneously, and releasing cblocks is executed more than one time
>>> to a file, then total block count of filesystem and block count of the
>>> file could be incorrect and damaged.
>>>
>>> We have to execute releasing compress blocks only one time for a file
>>> without being interfered by writepages path.
>>>
>>> Signed-off-by: Daeho Jeong <daehoje...@google.com>
>>> ---
>>> fs/f2fs/file.c | 31 ++++++++++++++++++++++++-------
>>> 1 file changed, 24 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>>> index 4aab4b42d8ba..a92bc51b9b28 100644
>>> --- a/fs/f2fs/file.c
>>> +++ b/fs/f2fs/file.c
>>> @@ -3488,6 +3488,7 @@ static int f2fs_release_compress_blocks(struct file
>>> *filp, unsigned long arg)
>>> pgoff_t page_idx = 0, last_idx;
>>> unsigned int released_blocks = 0;
>>> int ret;
>>> + int writecount;
>>>
>>> if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
>>> return -EOPNOTSUPP;
>>
>> Before inode_lock(), there is one case we may jump to out label, in
>> this case, we may unlock inode incorrectly.
>>
>> if (!F2FS_I(inode)->i_compr_blocks)
>> goto out;
>>
>>> -
>>> - inode_unlock(inode);
>>> out:
>>> + inode_unlock(inode);
>>> +
>>> mnt_drop_write_file(filp);
>>
>> Thanks,
> .
>
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