korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-24 20:54:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

btrfs: defrag: reject unknown flags of btrfs_ioctl_defrag_range_args

Browse Source 
Add extra sanity check for btrfs_ioctl_defrag_range_args::flags.

This is not really to enhance fuzzing tests, but as a preparation for
future expansion on btrfs_ioctl_defrag_range_args.

In the future we're going to add new members, allowing more fine tuning
for btrfs defrag.  Without the -ENONOTSUPP error, there would be no way
to detect if the kernel supports those new defrag features.

CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2024-01-10 08:58:26 +10:30 committed by David Sterba
parent 3324d05478
commit 173431b274
2 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/btrfs/ioctl.c
View File

@ -2602,6 +2602,10 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
ret = -EFAULT;
goto out;
}
if (range.flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) {
ret = -EOPNOTSUPP;
goto out;
}
/* compression requires us to start the IO */
if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
range.flags |= BTRFS_DEFRAG_RANGE_START_IO;

3
include/uapi/linux/btrfs.h
View File

@ -614,6 +614,9 @@ struct btrfs_ioctl_clone_range_args {
*/
#define BTRFS_DEFRAG_RANGE_COMPRESS 1
#define BTRFS_DEFRAG_RANGE_START_IO 2
#define BTRFS_DEFRAG_RANGE_FLAGS_SUPP (BTRFS_DEFRAG_RANGE_COMPRESS | \
BTRFS_DEFRAG_RANGE_START_IO)
struct btrfs_ioctl_defrag_range_args {
/* start of the defrag operation */
__u64 start;