ext4_extents.h

   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
  32 struct ext4_extent {
  33  __le32 ee_block;
  34  __le16 ee_len;
  35  __le16 ee_start_hi;
  36  __le32 ee_start_lo;
  37 };
  38
  39 struct ext4_extent_idx {
  40  __le32 ei_block;
  41  __le32 ei_leaf_lo;
  42  __le16 ei_leaf_hi;
  43  __u16 ei_unused;
  44 };
  45
  46 struct 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
  56 struct 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