Define/reserve new ext4 superblock fields

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index 1488684..de1f9f7 100644 (file)
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -513,7 +513,14 @@ struct ext4_super_block {
 /*150*/        __le32  s_blocks_count_hi;      /* Blocks count */
        __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
        __le32  s_free_blocks_count_hi; /* Free blocks count */
-       __u32   s_reserved[169];        /* Padding to the end of the block */
+       __u16   s_min_extra_isize;      /* All inodes have at least # bytes */
+       __u16   s_want_extra_isize;     /* New inodes should reserve # bytes */
+       __u32   s_flags;                /* Miscellaneous flags */
+       __u16   s_raid_stride;          /* RAID stride */
+       __u16   s_mmp_interval;         /* # seconds to wait in MMP checking */
+       __u64   s_mmp_block;            /* Block for multi-mount protection */
+       __u32   s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
+       __u32   s_reserved[163];        /* Padding to the end of the block */
 };
 
 #ifdef __KERNEL__