ext4: Add new superblock fields reserved for the Next3 snapshot feature
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 8b6d297..3864a27 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1002,7 +1002,13 @@
__u8 s_reserved_char_pad2;
__le16 s_reserved_pad;
__le64 s_kbytes_written; /* nr of lifetime kilobytes written */
- __u32 s_reserved[160]; /* Padding to the end of the block */
+ __le32 s_snapshot_inum; /* Inode number of active snapshot */
+ __le32 s_snapshot_id; /* sequential ID of active snapshot */
+ __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
+ snapshot's future use */
+ __le32 s_snapshot_list; /* inode number of the head of the
+ on-disk snapshot list */
+ __u32 s_reserved[155]; /* Padding to the end of the block */
};
#ifdef __KERNEL__