linux/include/linux/fiemap.h
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   1/*
   2 * FS_IOC_FIEMAP ioctl infrastructure.
   3 *
   4 * Some portions copyright (C) 2007 Cluster File Systems, Inc
   5 *
   6 * Authors: Mark Fasheh <mfasheh@suse.com>
   7 *          Kalpak Shah <kalpak.shah@sun.com>
   8 *          Andreas Dilger <adilger@sun.com>
   9 */
  10
  11#ifndef _LINUX_FIEMAP_H
  12#define _LINUX_FIEMAP_H
  13
  14#include <linux/types.h>
  15
  16struct fiemap_extent {
  17        __u64 fe_logical;  /* logical offset in bytes for the start of
  18                            * the extent from the beginning of the file */
  19        __u64 fe_physical; /* physical offset in bytes for the start
  20                            * of the extent from the beginning of the disk */
  21        __u64 fe_length;   /* length in bytes for this extent */
  22        __u64 fe_reserved64[2];
  23        __u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
  24        __u32 fe_reserved[3];
  25};
  26
  27struct fiemap {
  28        __u64 fm_start;         /* logical offset (inclusive) at
  29                                 * which to start mapping (in) */
  30        __u64 fm_length;        /* logical length of mapping which
  31                                 * userspace wants (in) */
  32        __u32 fm_flags;         /* FIEMAP_FLAG_* flags for request (in/out) */
  33        __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
  34        __u32 fm_extent_count;  /* size of fm_extents array (in) */
  35        __u32 fm_reserved;
  36        struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
  37};
  38
  39#define FIEMAP_MAX_OFFSET       (~0ULL)
  40
  41#define FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
  42#define FIEMAP_FLAG_XATTR       0x00000002 /* map extended attribute tree */
  43
  44#define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
  45
  46#define FIEMAP_EXTENT_LAST              0x00000001 /* Last extent in file. */
  47#define FIEMAP_EXTENT_UNKNOWN           0x00000002 /* Data location unknown. */
  48#define FIEMAP_EXTENT_DELALLOC          0x00000004 /* Location still pending.
  49                                                    * Sets EXTENT_UNKNOWN. */
  50#define FIEMAP_EXTENT_ENCODED           0x00000008 /* Data can not be read
  51                                                    * while fs is unmounted */
  52#define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080 /* Data is encrypted by fs.
  53                                                    * Sets EXTENT_NO_BYPASS. */
  54#define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100 /* Extent offsets may not be
  55                                                    * block aligned. */
  56#define FIEMAP_EXTENT_DATA_INLINE       0x00000200 /* Data mixed with metadata.
  57                                                    * Sets EXTENT_NOT_ALIGNED.*/
  58#define FIEMAP_EXTENT_DATA_TAIL         0x00000400 /* Multiple files in block.
  59                                                    * Sets EXTENT_NOT_ALIGNED.*/
  60#define FIEMAP_EXTENT_UNWRITTEN         0x00000800 /* Space allocated, but
  61                                                    * no data (i.e. zero). */
  62#define FIEMAP_EXTENT_MERGED            0x00001000 /* File does not natively
  63                                                    * support extents. Result
  64                                                    * merged for efficiency. */
  65#define FIEMAP_EXTENT_SHARED            0x00002000 /* Space shared with other
  66                                                    * files. */
  67
  68#endif /* _LINUX_FIEMAP_H */
  69
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