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c0677e6d0f
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>
25 lines
564 B
C
25 lines
564 B
C
/*
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* fs/ext4/extents_status.h
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*
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* Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
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* Modified by
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* Allison Henderson <achender@linux.vnet.ibm.com>
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* Zheng Liu <wenqing.lz@taobao.com>
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*
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*/
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#ifndef _EXT4_EXTENTS_STATUS_H
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#define _EXT4_EXTENTS_STATUS_H
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struct extent_status {
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struct rb_node rb_node;
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ext4_lblk_t start; /* first block extent covers */
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ext4_lblk_t len; /* length of extent in block */
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};
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struct ext4_es_tree {
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struct rb_root root;
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struct extent_status *cache_es; /* recently accessed extent */
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};
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#endif /* _EXT4_EXTENTS_STATUS_H */
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