From: Zheng Liu Date: Thu, 8 Nov 2012 20:18:54 +0000 (-0500) Subject: ext4: add data structures for the extent status tree X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c0677e6d0f9d991adff972b8d06cb83de1f8ee8e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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 Signed-off-by: Allison Henderson Signed-off-by: Zheng Liu Signed-off-by: "Theodore Ts'o" --- diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 3c20de1d59d0..bcc634b26d46 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -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; 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 + * Modified by + * Allison Henderson + * Zheng Liu + * + */ + +#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 */