1/****************************************************************************
2 ****************************************************************************
3 ***
4 ***   This header was automatically generated from a Linux kernel header
5 ***   of the same name, to make information necessary for userspace to
6 ***   call into the kernel available to libc.  It contains only constants,
7 ***   structures, and macros generated from the original header, and thus,
8 ***   contains no copyrightable information.
9 ***
10 ****************************************************************************
11 ****************************************************************************/
12#ifndef _EXT4_EXTENTS
13#define _EXT4_EXTENTS
14
15#include "ext4.h"
16
17#define AGGRESSIVE_TEST_
18
19#define EXTENTS_STATS__
20
21#define CHECK_BINSEARCH__
22
23#define EXT_DEBUG__
24#ifdef EXT_DEBUG
25#define ext_debug(a...) printk(a)
26#else
27#define ext_debug(a...)
28#endif
29
30#define EXT_STATS_
31
32struct ext4_extent {
33 __le32 ee_block;
34 __le16 ee_len;
35 __le16 ee_start_hi;
36 __le32 ee_start_lo;
37};
38
39struct ext4_extent_idx {
40 __le32 ei_block;
41 __le32 ei_leaf_lo;
42 __le16 ei_leaf_hi;
43 __u16 ei_unused;
44};
45
46struct ext4_extent_header {
47 __le16 eh_magic;
48 __le16 eh_entries;
49 __le16 eh_max;
50 __le16 eh_depth;
51 __le32 eh_generation;
52};
53
54#define EXT4_EXT_MAGIC 0xf30a
55
56struct ext4_ext_path {
57 ext4_fsblk_t p_block;
58 __u16 p_depth;
59 struct ext4_extent *p_ext;
60 struct ext4_extent_idx *p_idx;
61 struct ext4_extent_header *p_hdr;
62 struct buffer_head *p_bh;
63};
64
65#define EXT4_EXT_CACHE_NO 0
66#define EXT4_EXT_CACHE_GAP 1
67#define EXT4_EXT_CACHE_EXTENT 2
68
69#define EXT_CONTINUE 0
70#define EXT_BREAK 1
71#define EXT_REPEAT 2
72
73#define EXT_MAX_BLOCK 0xffffffff
74
75#define EXT_INIT_MAX_LEN (1UL << 15)
76#define EXT_UNINIT_MAX_LEN (EXT_INIT_MAX_LEN - 1)
77
78#define EXT_FIRST_EXTENT(__hdr__)   ((struct ext4_extent *) (((char *) (__hdr__)) +   sizeof(struct ext4_extent_header)))
79#define EXT_FIRST_INDEX(__hdr__)   ((struct ext4_extent_idx *) (((char *) (__hdr__)) +   sizeof(struct ext4_extent_header)))
80#define EXT_HAS_FREE_INDEX(__path__)   (le16_to_cpu((__path__)->p_hdr->eh_entries)   < le16_to_cpu((__path__)->p_hdr->eh_max))
81#define EXT_LAST_EXTENT(__hdr__)   (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
82#define EXT_LAST_INDEX(__hdr__)   (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
83#define EXT_MAX_EXTENT(__hdr__)   (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
84#define EXT_MAX_INDEX(__hdr__)   (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
85
86#endif
87
88
89