linux-kernel - Re: [PATCH] ocfs2: check new file size on fallocate call

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Message-ID: <810630b9-2021-01b3-1473-aa759174205e@linux.alibaba.com>
Date:   Wed, 31 May 2023 14:00:12 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Luís Henriques <lhenriques@...e.de>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Heming Zhao <heming.zhao@...e.com>
Cc:     ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ocfs2: check new file size on fallocate call



On 5/29/23 11:26 PM, Luís Henriques wrote:
> When changing a file size with fallocate() the new size isn't being
> checked.  In particular, the FSIZE ulimit isn't being checked, which makes
> fstest generic/228 fail.  Simply adding a call to inode_newsize_ok() fixes
> this issue.
> 
> Signed-off-by: Luís Henriques <lhenriques@...e.de>
> ---
>  fs/ocfs2/file.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
> index efb09de4343d..b173c36bcab3 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -2100,14 +2100,20 @@ static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
>  	struct ocfs2_space_resv sr;
>  	int change_size = 1;
>  	int cmd = OCFS2_IOC_RESVSP64;
> +	int ret = 0;
>  
>  	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
>  		return -EOPNOTSUPP;

This means we only support keep-size and pouch_hole.
And it seems pouch_hole will also imply keep-size.

>  	if (!ocfs2_writes_unwritten_extents(osb))
>  		return -EOPNOTSUPP;
>  
> -	if (mode & FALLOC_FL_KEEP_SIZE)
> +	if (mode & FALLOC_FL_KEEP_SIZE) {
>  		change_size = 0;
> +	} else {

Seems this will be a dead branch?

Thanks,
Joseph

> +		ret = inode_newsize_ok(inode, offset + len);
> +		if (ret)
> +			return ret;
> +	}
>  
>  	if (mode & FALLOC_FL_PUNCH_HOLE)
>  		cmd = OCFS2_IOC_UNRESVSP64;