linux-kernel - Re: [PATCH AUTOSEL 4.4 23/56] fuse: honor RLIMIT_FSIZE in fuse_file

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Message-ID: <20190605202456.2emhy5t26c7mg4f2@US-160370MP2.local>
Date:   Wed, 5 Jun 2019 13:24:57 -0700
From:   Liu Bo <bo.liu@...ux.alibaba.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Miklos Szeredi <mszeredi@...hat.com>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.4 23/56] fuse: honor RLIMIT_FSIZE in
 fuse_file_fallocate

On Sat, Jun 01, 2019 at 09:25:27AM -0400, Sasha Levin wrote:
> From: Liu Bo <bo.liu@...ux.alibaba.com>
> 
> [ Upstream commit 0cbade024ba501313da3b7e5dd2a188a6bc491b5 ]
> 
> fstests generic/228 reported this failure that fuse fallocate does not
> honor what 'ulimit -f' has set.
> 
> This adds the necessary inode_newsize_ok() check.
> 
> Signed-off-by: Liu Bo <bo.liu@...ux.alibaba.com>
> Fixes: 05ba1f082300 ("fuse: add FALLOCATE operation")
> Cc: <stable@...r.kernel.org> # v3.5
> Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  fs/fuse/file.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index d40c2451487cb..3ba45758e0938 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -2947,6 +2947,13 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
>  		}
>  	}
>  
> +	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
> +	    offset + length > i_size_read(inode)) {
> +		err = inode_newsize_ok(inode, offset + length);
> +		if (err)
> +			return err;

A later commit [1] was proposed to fix a problem of returning without unlock.

[1]: https://kernel.googlesource.com/pub/scm/linux/kernel/git/mszeredi/fuse/+/35d6fcbb7c3e296a52136347346a698a35af3fda

thanks,
-liubo

> +	}
> +
>  	if (!(mode & FALLOC_FL_KEEP_SIZE))
>  		set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
>  
> -- 
> 2.20.1