diff options
| -rw-r--r-- | fs/btrfs/ioctl.c | 1 | ||||
| -rw-r--r-- | include/uapi/linux/btrfs.h | 12 |
2 files changed, 12 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 8ea557e22252..439a5bf5ebc6 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2859,6 +2859,7 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, di_args->bytes_used = btrfs_device_get_bytes_used(dev); di_args->total_bytes = btrfs_device_get_total_bytes(dev); memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); + memcpy(di_args->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); if (dev->name) strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path)); else diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index b4f0f9531119..ada0a489bf2b 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -245,7 +245,17 @@ struct btrfs_ioctl_dev_info_args { __u8 uuid[BTRFS_UUID_SIZE]; /* in/out */ __u64 bytes_used; /* out */ __u64 total_bytes; /* out */ - __u64 unused[379]; /* pad to 4k */ + /* + * Optional, out. + * + * Showing the fsid of the device, allowing user space to check if this + * device is a seeding one. + * + * Introduced in v6.3, thus user space still needs to check if kernel + * changed this value. Older kernel will not touch the values here. + */ + __u8 fsid[BTRFS_UUID_SIZE]; + __u64 unused[377]; /* pad to 4k */ __u8 path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */ }; |