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Commit c0677e6d authored by Zheng Liu's avatar Zheng Liu Committed by Theodore Ts'o
Browse files

ext4: add data structures for the extent status tree 



This patch adds two structures that supports extent status tree, extent_status
and ext4_es_tree.  Currently extent_status is used to track a delay extent for
an inode, which record the start block and the length of the delay extent.
ext4_es_tree is used to store all extent_status for an inode in memory.

Signed-off-by: default avatarYongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: default avatarAllison Henderson <achender@linux.vnet.ibm.com>
Signed-off-by: default avatarZheng Liu <wenqing.lz@taobao.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 07aa2ea1

fs/ext4/ext4.h

+6 −0
Original line number Original line Diff line number Diff line
@@ -811,6 +811,8 @@ struct ext4_ext_cache { 
	__u32		ec_len; /* must be 32bit to return holes */

	__u32		ec_len; /* must be 32bit to return holes */

};

};





#include "extents_status.h"



/*

/*

 * fourth extended file system inode data in memory

 * fourth extended file system inode data in memory

 */

 */
@@ -888,6 +890,10 @@ struct ext4_inode_info { 
	struct list_head i_prealloc_list;

	struct list_head i_prealloc_list;

	spinlock_t i_prealloc_lock;

	spinlock_t i_prealloc_lock;





	/* extents status tree */

	struct ext4_es_tree i_es_tree;

	rwlock_t i_es_lock;



	/* ialloc */

	/* ialloc */

	ext4_group_t	i_last_alloc_group;

	ext4_group_t	i_last_alloc_group;

fs/ext4/extents_status.h

0 → 100644
+25 −0
Original line number Original line Diff line number Diff line 
/*

 *  fs/ext4/extents_status.h

 *

 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>

 * Modified by

 *	Allison Henderson <achender@linux.vnet.ibm.com>

 *	Zheng Liu <wenqing.lz@taobao.com>

 *

 */



#ifndef _EXT4_EXTENTS_STATUS_H

#define _EXT4_EXTENTS_STATUS_H



struct extent_status {

	struct rb_node rb_node;

	ext4_lblk_t start;	/* first block extent covers */

	ext4_lblk_t len;	/* length of extent in block */

};



struct ext4_es_tree {

	struct rb_root root;

	struct extent_status *cache_es;	/* recently accessed extent */

};



#endif /* _EXT4_EXTENTS_STATUS_H */