linux-kernel - Re: [PATCH 1/2] f2fs: move the conditional statement after holding the inode lock in f2fs_move_file

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Message-ID: <d0da5b97-682d-9fef-3fb0-1381ead79667@wanadoo.fr>
Date:   Sat, 6 May 2023 16:13:23 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Yangtao Li <frank.li@...o.com>, Jaegeuk Kim <jaegeuk@...nel.org>,
        Chao Yu <chao@...nel.org>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] f2fs: move the conditional statement after holding
 the inode lock in f2fs_move_file_range()

Le 06/05/2023 à 13:39, Yangtao Li a écrit :
> For judging the inode flag state, the inode lock must be held.
> BTW, add compressd file check and to avoid 'if' nesting.
> 
> Fixes: 4dd6f977fc77 ("f2fs: support an ioctl to move a range of data blocks")
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>   fs/f2fs/file.c | 14 ++++++++------
>   1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 78aa8cff4b41..850e745ecf88 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2790,9 +2790,6 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
>   	if (!S_ISREG(src->i_mode) || !S_ISREG(dst->i_mode))
>   		return -EINVAL;
>   
> -	if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst))
> -		return -EOPNOTSUPP;
> -
>   	if (pos_out < 0 || pos_in < 0)
>   		return -EINVAL;
>   
> @@ -2804,12 +2801,17 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
>   	}
>   
>   	inode_lock(src);
> -	if (src != dst) {
> +	if (src != dst && !inode_trylock(dst)) {
>   		ret = -EBUSY;
> -		if (!inode_trylock(dst))
> -			goto out;
> +		goto out;
>   	}
>   
> +	if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst))
> +		return -EOPNOTSUPP;

ret = -EOPNOTSUPP;
goto out_unlock;

?

> +
> +	if (f2fs_compressed_file(src) || f2fs_compressed_file(dst))
> +		return -EOPNOTSUPP;

Same

CJ

> +
>   	ret = -EINVAL;
>   	if (pos_in + len > src->i_size || pos_in + len < pos_in)
>   		goto out_unlock;