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Commit 8a2005d3 authored by Theodore Ts'o's avatar Theodore Ts'o
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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: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent b05e6ae5

fs/ext4/ext4.h

+4 −3
Original line number Original line Diff line number Diff line
@@ -763,10 +763,10 @@ struct ext4_inode_info { 
	 * near to their parent directory's inode.

	 * near to their parent directory's inode.

	 */

	 */

	ext4_group_t	i_block_group;

	ext4_group_t	i_block_group;

	ext4_lblk_t	i_dir_start_lookup;

	unsigned long	i_state_flags;		/* Dynamic state flags */

	unsigned long	i_state_flags;		/* Dynamic state flags */

	unsigned long	i_flags;

	unsigned long	i_flags;





	ext4_lblk_t		i_dir_start_lookup;

#ifdef CONFIG_EXT4_FS_XATTR

#ifdef CONFIG_EXT4_FS_XATTR

	/*

	/*

	 * Extended attributes can be read independently of the main file

	 * Extended attributes can be read independently of the main file
@@ -835,7 +835,6 @@ struct ext4_inode_info { 
	/* on-disk additional length */

	/* on-disk additional length */

	__u16 i_extra_isize;

	__u16 i_extra_isize;





	spinlock_t i_block_reservation_lock;

#ifdef CONFIG_QUOTA

#ifdef CONFIG_QUOTA

	/* quota space reservation, managed internally by quota code */

	/* quota space reservation, managed internally by quota code */

	qsize_t i_reserved_quota;

	qsize_t i_reserved_quota;
@@ -844,9 +843,11 @@ struct ext4_inode_info { 
	/* completed IOs that might need unwritten extents handling */

	/* completed IOs that might need unwritten extents handling */

	struct list_head i_completed_io_list;

	struct list_head i_completed_io_list;

	spinlock_t i_completed_io_lock;

	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*/

	/* current io_end structure for async DIO write*/

	ext4_io_end_t *cur_aio_dio;

	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

	 * Transactions that contain inode's metadata needed to complete