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| author | Zheng Liu <wenqing.lz@taobao.com> | 2012-11-09 00:18:54 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-11-09 00:18:54 +0400 |
| commit | c0677e6d0f9d991adff972b8d06cb83de1f8ee8e (patch) | |
| tree | f320c2fb163763f200d0126c90fcbd909bfbedf2 /fs/ext4/extents_status.h | |
| parent | 07aa2ea13814ea60d12f7330b6d5ccfdb0c3ba4d (diff) | |
| download | linux-c0677e6d0f9d991adff972b8d06cb83de1f8ee8e.tar.xz | |
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>
Diffstat (limited to 'fs/ext4/extents_status.h')
| -rw-r--r-- | fs/ext4/extents_status.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h new file mode 100644 index 000000000000..8be2ab9c9425 --- /dev/null +++ b/fs/ext4/extents_status.h @@ -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 */ |