Add retrieval of the filesystem's generation to the fsinfo ioctl. This is
driven by setting the BTRFS_FS_INFO_FLAG_GENERATION flag in
btrfs_ioctl_fs_info_args::flags.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---
fs/btrfs/ioctl.c | 5 +++++
include/uapi/linux/btrfs.h | 6 +++++-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 3a566cf71fc6..f1b433ec09e8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3247,6 +3247,11 @@ static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
}
+ if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
+ fi_args->generation = fs_info->generation;
+ fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
+ }
+
if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
ret = -EFAULT;
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 0f81f69dbe22..19609dd5db18 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -250,6 +250,9 @@ struct btrfs_ioctl_dev_info_args {
/* Request information about checksum type and size */
#define BTRFS_FS_INFO_FLAG_CSUM_INFO (1 << 0)
+/* Request information about filesystem generation */
+#define BTRFS_FS_INFO_FLAG_GENERATION (1 << 1)
+
struct btrfs_ioctl_fs_info_args {
__u64 max_id; /* out */
__u64 num_devices; /* out */
@@ -261,7 +264,8 @@ struct btrfs_ioctl_fs_info_args {
__u32 flags; /* in/out */
__u16 csum_type; /* out */
__u16 csum_size; /* out */
- __u8 reserved[972]; /* pad to 1k */
+ __u32 generation; /* out */
+ __u8 reserved[968]; /* pad to 1k */
};
--
2.26.2
