From: Chao Yu <yuchao0@huawei.com>
To: Daeho Jeong <daeho43@gmail.com>, <linux-kernel@vger.kernel.org>,
<linux-f2fs-devel@lists.sourceforge.net>,
<kernel-team@android.com>
Cc: Daeho Jeong <daehojeong@google.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: remove race condition in releasing cblocks
Date: Fri, 8 May 2020 14:50:10 +0800 [thread overview]
Message-ID: <4dfb73d9-03a0-bb2f-a112-1dd42db4d7bb@huawei.com> (raw)
In-Reply-To: <20200508042506.143395-1-daeho43@gmail.com>
On 2020/5/8 12:25, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@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 <daehojeong@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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next prev parent reply other threads:[~2020-05-08 6:50 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 4:25 [f2fs-dev] [PATCH] f2fs: remove race condition in releasing cblocks Daeho Jeong
2020-05-08 6:50 ` Chao Yu [this message]
2020-05-08 6:58 ` Daeho Jeong
2020-05-08 7:09 ` Chao Yu
2020-05-08 7:10 ` Daeho Jeong
2020-05-08 9:29 Daeho Jeong
2020-05-08 10:09 ` Chao Yu
2020-05-08 13:47 ` Jaegeuk Kim
2020-05-08 11:56 Daeho Jeong
2020-05-08 13:48 ` Jaegeuk Kim
2020-05-08 13:58 ` Jaegeuk Kim
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