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

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Message-ID: <7ab5fb52-8d5b-4de5-78d7-da32254d8d25@wanadoo.fr>
Date:   Sat, 6 May 2023 16:17:32 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Yangtao Li <frank.li@...o.com>, jaegeuk@...nel.org, chao@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] f2fs: move the conditional statement after holding
 the inode lock in f2fs_fallocate()

Le 06/05/2023 à 13:40, Yangtao Li a écrit :
> For judging the inode flag state, the inode lock must be held.
> 
> Fixes: fcc85a4d86b5 ("f2fs crypto: activate encryption support for fs APIs")
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>   fs/f2fs/file.c | 14 +++++++-------
>   1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 850e745ecf88..0837c500b990 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1801,6 +1801,13 @@ static long f2fs_fallocate(struct file *file, int mode,
>   	if (!S_ISREG(inode->i_mode))
>   		return -EINVAL;
>   
> +	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
> +			FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
> +			FALLOC_FL_INSERT_RANGE))
> +		return -EOPNOTSUPP;
> +
> +	inode_lock(inode);
> +
>   	if (IS_ENCRYPTED(inode) &&
>   		(mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
>   		return -EOPNOTSUPP;

ret = -EOPNOTSUPP;
goto out;

here and in some other places below.

Maybe the code should de rearranged another way if 
trace_f2fs_fallocate() should not be called in such cases.

CJ

> @@ -1814,13 +1821,6 @@ static long f2fs_fallocate(struct file *file, int mode,
>   			FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE)))
>   		return -EOPNOTSUPP;
>   
> -	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
> -			FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
> -			FALLOC_FL_INSERT_RANGE))
> -		return -EOPNOTSUPP;
> -
> -	inode_lock(inode);
> -
>   	ret = file_modified(file);
>   	if (ret)
>   		goto out;