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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: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: Allison Henderson <achender@linux.vnet.ibm.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Zheng Liu 2012-11-08 15:18:54 -05:00 committed by Theodore Ts'o
parent 07aa2ea138
commit c0677e6d0f
2 changed files with 31 additions and 0 deletions
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6
fs/ext4/ext4.h
View File

@ -811,6 +811,8 @@ struct ext4_ext_cache {
__u32 ec_len; /* must be 32bit to return holes */
};
#include "extents_status.h"
/*
* fourth extended file system inode data in memory
*/
@ -888,6 +890,10 @@ struct ext4_inode_info {
struct list_head i_prealloc_list;
spinlock_t i_prealloc_lock;
/* extents status tree */
struct ext4_es_tree i_es_tree;
rwlock_t i_es_lock;
/* ialloc */
ext4_group_t i_last_alloc_group;

25
fs/ext4/extents_status.h Normal file
View File

@ -0,0 +1,25 @@
/*
* 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 */