Re: [PATCH] f2fs: do not allow to defragment files have FI_COMPRESS_RELEASED

[Chao Yu]

On 2023/4/25 23:11, Yangtao Li wrote:
> If a file has FI_COMPRESS_RELEASED, all writes for it should not be
> allowed.
>
> Fixes: 5fdb322ff2c2 ("f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE")
> Signed-off-by: Qi Han <hanqi@xxxxxxxx>
> Signed-off-by: Yangtao Li <frank.li@xxxxxxxx>
> ---
>   fs/f2fs/file.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 9c9c3f660e01..c21d6a829c4a 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2734,6 +2734,9 @@ static int f2fs_ioc_defragment(struct file *filp, unsigned long arg)
>   	if (f2fs_readonly(sbi->sb))
>   		return -EROFS;
>   
> +	if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
> +		return -EINVAL;

This flag should be checked w/ inode lock.

Thanks,

> +
>   	if (copy_from_user(&range, (struct f2fs_defragment __user *)arg,
>   							sizeof(range)))
>   		return -EFAULT;