ext4: reorder ext4_inode_info structure elements to remove unneeded padding

By reordering the elements in the ext4_inode_info structure, we can
reduce the padding needed on an x86_64 system by 16 bytes.

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

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index de937fc10503..50e3d24483fb 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -763,10 +763,10 @@ struct ext4_inode_info {
          * near to their parent directory's inode.
          */
         ext4_group_t    i_block_group;
+        ext4_lblk_t     i_dir_start_lookup;
         unsigned long   i_state_flags;          /* Dynamic state flags */
         unsigned long   i_flags;
 
-        ext4_lblk_t             i_dir_start_lookup;
 #ifdef CONFIG_EXT4_FS_XATTR
         /*
          * Extended attributes can be read independently of the main file
@@ -835,7 +835,6 @@ struct ext4_inode_info {
         /* on-disk additional length */
         __u16 i_extra_isize;
 
-        spinlock_t i_block_reservation_lock;
 #ifdef CONFIG_QUOTA
         /* quota space reservation, managed internally by quota code */
         qsize_t i_reserved_quota;
@@ -844,9 +843,11 @@ struct ext4_inode_info {
         /* completed IOs that might need unwritten extents handling */
         struct list_head i_completed_io_list;
         spinlock_t i_completed_io_lock;
+        atomic_t i_ioend_count; /* Number of outstanding io_end structs */
         /* current io_end structure for async DIO write*/
         ext4_io_end_t *cur_aio_dio;
-        atomic_t i_ioend_count; /* Number of outstanding io_end structs */
+
+        spinlock_t i_block_reservation_lock;
 
         /*
          * Transactions that contain inode's metadata needed to complete