diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/ext3_fs_i.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/ext3_fs_i.h b/include/linux/ext3_fs_i.h index ec11e1ab01c5..02021676dd74 100644 --- a/include/linux/ext3_fs_i.h +++ b/include/linux/ext3_fs_i.h @@ -32,9 +32,30 @@ struct ext3_inode_info { __u32 i_file_acl; __u32 i_dir_acl; __u32 i_dtime; + + /* + * i_block_group is the number of the block group which contains + * this file's inode. Constant across the lifetime of the inode, + * it is ued for making block allocation decisions - we try to + * place a file's data blocks near its inode block, and new inodes + * near to their parent directory's inode. + */ __u32 i_block_group; __u32 i_state; /* Dynamic state flags for ext3 */ + + /* + * i_next_alloc_block is the logical (file-relative) number of the + * most-recently-allocated block in this file. Yes, it is misnamed. + * We use this for detecting linearly ascending allocation requests. + */ __u32 i_next_alloc_block; + + /* + * i_next_alloc_goal is the *physical* companion to i_next_alloc_block. + * it the the physical block number of the block which was most-recently + * allocated to this file. This give us the goal (target) for the next + * allocation when we detect linearly ascending requests. + */ __u32 i_next_alloc_goal; #ifdef EXT3_PREALLOCATE __u32 i_prealloc_block; |