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      This is protected by the ifdef because it uses non standard
  56      zero length arrays.  Note C99 has the equivalent flexible arrays,
  57      but we don't use those for maximum portability to older systems.  */
  58 # ifdef __linux__
  59   struct fiemap_extent fm_extents[0];
  60 # endif
  61 };
  62
  63 /* The maximum offset can be mapped for a file.  */
  64 # define FIEMAP_MAX_OFFSET       (~0ULL)
  65
  66 /* Sync file data before map.  */
  67 # define FIEMAP_FLAG_SYNC        0x00000001
  68
  69 /* Map extented attribute tree.  */
  70 # define FIEMAP_FLAG_XATTR       0x00000002
  71
  72 # define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
  73
  74 /* Last extent in file.  */
  75 # define FIEMAP_EXTENT_LAST              0x00000001
  76
  77 /* Data location unknown.  */
  78 # define FIEMAP_EXTENT_UNKNOWN           0x00000002
  79
  80 /* Location still pending, Sets EXTENT_UNKNOWN.  */
  81 # define FIEMAP_EXTENT_DELALLOC          0x00000004
  82
  83 /* Data cannot be read while fs is unmounted.  */
  84 # define FIEMAP_EXTENT_ENCODED           0x00000008
  85
  86 /* Data is encrypted by fs.  Sets EXTENT_NO_BYPASS.  */
  87 # define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080
  88
  89 /* Extent offsets may not be block aligned.  */
  90 # define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100
  91
  92 /* Data mixed with metadata.  Sets EXTENT_NOT_ALIGNED.  */
  93 # define FIEMAP_EXTENT_DATA_INLINE       0x00000200
  94
  95 /* Multiple files in block.  Set EXTENT_NOT_ALIGNED.  */
  96 # define FIEMAP_EXTENT_DATA_TAIL         0x00000400
  97
  98 /* Space allocated, but not data (i.e. zero).  */
  99 # define FIEMAP_EXTENT_UNWRITTEN         0x00000800
 100
 101 /* File does not natively support extents.  Result merged for efficiency.  */
 102 # define FIEMAP_EXTENT_MERGED           0x00001000
 103
 104 /* Space shared with other files.  */
 105 # define FIEMAP_EXTENT_SHARED            0x00002000
 106
 107 #endif