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btrfs: add metadata_uuid to FS_INFO ioctl 

Add retrieval of the filesystem's metadata UUID to the fsinfo ioctl.
This is driven by setting the BTRFS_FS_INFO_FLAG_METADATA_UUID flag in
btrfs_ioctl_fs_info_args::flags.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2020-07-13 21:29:00 +09:00 committed by David Sterba
parent 0fb408a558
commit 49bac89768
2 changed files with 10 additions and 1 deletions
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6
fs/btrfs/ioctl.c
View File

@ -3252,6 +3252,12 @@ static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
}
if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
sizeof(fi_args->metadata_uuid));
fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
}
if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
ret = -EFAULT;

5
include/uapi/linux/btrfs.h
View File

@ -252,6 +252,8 @@ struct btrfs_ioctl_dev_info_args {
/* Request information about filesystem generation */
#define BTRFS_FS_INFO_FLAG_GENERATION (1 << 1)
/* Request information about filesystem metadata UUID */
#define BTRFS_FS_INFO_FLAG_METADATA_UUID (1 << 2)
struct btrfs_ioctl_fs_info_args {
__u64 max_id; /* out */
@ -265,7 +267,8 @@ struct btrfs_ioctl_fs_info_args {
__u16 csum_size; /* out */
__u64 flags; /* in/out */
__u64 generation; /* out */
__u8 reserved[960]; /* pad to 1k */
__u8 metadata_uuid[BTRFS_FSID_SIZE]; /* out */
__u8 reserved[944]; /* pad to 1k */
};
/*