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[PATCH] ext3: add extent map support

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On disk extents format:
/*
* this is extent on-disk structure
* it's used at the bottom of the tree
*/
struct ext3_extent {
__le32  ee_block;       /* first logical block extent covers */
__le16  ee_len;         /* number of blocks covered by extent */
__le16  ee_start_hi;    /* high 16 bits of physical block */
__le32  ee_start;       /* low 32 bigs of physical block */
};

Signed-off-by: Alex Tomas <alex@clusterfs.com>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alex Tomas 2006-10-11 01:21:03 -07:00 • committed by Linus Torvalds
parent c3fcc8137c
commit a86c618126
12 changed files with 2368 additions and 18 deletions
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13
include/linux/ext4_fs_i.h
View file

@ -64,6 +64,16 @@ struct ext4_block_alloc_info {
#define rsv_start rsv_window._rsv_start
#define rsv_end rsv_window._rsv_end
/*
* storage for cached extent
*/
struct ext4_ext_cache {
__u32 ec_start;
__u32 ec_block;
__u32 ec_len; /* must be 32bit to return holes */
__u32 ec_type;
};
/*
* third extended file system inode data in memory
*/
@ -142,6 +152,9 @@ struct ext4_inode_info {
*/
struct mutex truncate_mutex;
struct inode vfs_inode;
unsigned long i_ext_generation;
struct ext4_ext_cache i_cached_extent;
};
#endif /* _LINUX_EXT4_FS_I */