src/fiemap.h

   1 /* FS_IOC_FIEMAP ioctl infrastructure.
   2    Some portions copyright (C) 2007 Cluster File Systems, Inc
   3    Authors: Mark Fasheh <mfasheh@suse.com>
   4             Kalpak Shah <kalpak.shah@sun.com>
   5             Andreas Dilger <adilger@sun.com>.  */
   6
   7 /* Copy from kernel, modified to respect GNU code style by Jie Liu.  */
   8
   9 #ifndef _LINUX_FIEMAP_H
  10 # define _LINUX_FIEMAP_H
  11
  12 # include <stdint.h>
  13
  14 struct fiemap_extent
  15 {
  16   /* Logical offset in bytes for the start of the extent
  17      from the beginning of the file.  */
  18   uint64_t fe_logical;
  19
  20   /* Physical offset in bytes for the start of the extent
  21      from the beginning of the disk.  */
  22   uint64_t fe_physical;
  23
  24   /* Length in bytes for this extent.  */
  25   uint64_t fe_length;
  26
  27   uint64_t fe_reserved64[2];
  28
  29   /* FIEMAP_EXTENT_* flags for this extent.  */
  30   uint32_t fe_flags;
  31
  32   uint32_t fe_reserved[3];
  33 };
  34
  35 struct fiemap
  36 {
  37   /* Logical offset(inclusive) at which to start mapping(in).  */
  38   uint64_t fm_start;
  39
  40   /* Logical length of mapping which userspace wants(in).  */
  41   uint64_t fm_length;
  42
  43   /* FIEMAP_FLAG_* flags for request(in/out).  */
  44   uint32_t fm_flags;
  45
  46   /* Number of extents that were mapped(out).  */
  47   uint32_t fm_mapped_extents;
  48
  49   /* Size of fm_extents array(in).  */
  50   uint32_t fm_extent_count;
  51
  52   uint32_t fm_reserved;
  53
  54   /* Array of mapped extents(out).  */
  55   struct fiemap_extent fm_extents[0];
  56 };
  57
  58 /* The maximum offset can be mapped for a file.  */
  59 # define FIEMAP_MAX_OFFSET       (~0ULL)
  60
  61 /* Sync file data before map.  */
  62 # define FIEMAP_FLAG_SYNC        0x00000001
  63
  64 /* Map extented attribute tree.  */
  65 # define FIEMAP_FLAG_XATTR       0x00000002
  66
  67 # define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
  68
  69 /* Last extent in file.  */
  70 # define FIEMAP_EXTENT_LAST              0x00000001
  71
  72 /* Data location unknown.  */
  73 # define FIEMAP_EXTENT_UNKNOWN           0x00000002
  74
  75 /* Location still pending, Sets EXTENT_UNKNOWN.  */
  76 # define FIEMAP_EXTENT_DELALLOC          0x00000004
  77
  78 /* Data can not be read while fs is unmounted.  */
  79 # define FIEMAP_EXTENT_ENCODED           0x00000008
  80
  81 /* Data is encrypted by fs.  Sets EXTENT_NO_BYPASS.  */
  82 # define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080
  83
  84 /* Extent offsets may not be block aligned.  */
  85 # define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100
  86
  87 /* Data mixed with metadata.  Sets EXTENT_NOT_ALIGNED.  */
  88 # define FIEMAP_EXTENT_DATA_INLINE       0x00000200
  89
  90 /* Multiple files in block.  Set EXTENT_NOT_ALIGNED.  */
  91 # define FIEMAP_EXTENT_DATA_TAIL         0x00000400
  92
  93 /* Space allocated, but not data (i.e. zero).  */
  94 # define FIEMAP_EXTENT_UNWRITTEN         0x00000800
  95
  96 /* File does not natively support extents.  Result merged for efficiency.  */
  97 # define FIEMAP_EXTENT_MERGED           0x00001000
  98
  99 /* Space shared with other files.  */
 100 # define FIEMAP_EXTENT_SHARED            0x00002000
 101
 102 #endif