/* FS_IOC_FIEMAP ioctl infrastructure.
   Some portions copyright (C) 2007 Cluster File Systems, Inc
   Authors: Mark Fasheh <mfasheh@suse.com>
            Kalpak Shah <kalpak.shah@sun.com>
            Andreas Dilger <adilger@sun.com>.  */

/* Copy from kernel, modified to respect GNU code style by Jie Liu.  */

#ifndef _LINUX_FIEMAP_H
# define _LINUX_FIEMAP_H

# include <stdint.h>

struct fiemap_extent
{
  /* Logical offset in bytes for the start of the extent
     from the beginning of the file.  */
  uint64_t fe_logical;

  /* Physical offset in bytes for the start of the extent
     from the beginning of the disk.  */
  uint64_t fe_physical;

  /* Length in bytes for this extent.  */
  uint64_t fe_length;

  uint64_t fe_reserved64[2];

  /* FIEMAP_EXTENT_* flags for this extent.  */
  uint32_t fe_flags;

  uint32_t fe_reserved[3];
};

struct fiemap
{
  /* Logical offset(inclusive) at which to start mapping(in).  */
  uint64_t fm_start;

  /* Logical length of mapping which userspace wants(in).  */
  uint64_t fm_length;

  /* FIEMAP_FLAG_* flags for request(in/out).  */
  uint32_t fm_flags;

  /* Number of extents that were mapped(out).  */
  uint32_t fm_mapped_extents;

  /* Size of fm_extents array(in).  */
  uint32_t fm_extent_count;

  uint32_t fm_reserved;

  /* Array of mapped extents(out).  */
  struct fiemap_extent fm_extents[0];
};

/* The maximum offset can be mapped for a file.  */
# define FIEMAP_MAX_OFFSET       (~0ULL)

/* Sync file data before map.  */
# define FIEMAP_FLAG_SYNC        0x00000001

/* Map extented attribute tree.  */
# define FIEMAP_FLAG_XATTR       0x00000002

# define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)

/* Last extent in file.  */
# define FIEMAP_EXTENT_LAST              0x00000001

/* Data location unknown.  */
# define FIEMAP_EXTENT_UNKNOWN           0x00000002

/* Location still pending, Sets EXTENT_UNKNOWN.  */
# define FIEMAP_EXTENT_DELALLOC          0x00000004

/* Data can not be read while fs is unmounted.  */
# define FIEMAP_EXTENT_ENCODED           0x00000008

/* Data is encrypted by fs.  Sets EXTENT_NO_BYPASS.  */
# define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080

/* Extent offsets may not be block aligned.  */
# define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100

/* Data mixed with metadata.  Sets EXTENT_NOT_ALIGNED.  */
# define FIEMAP_EXTENT_DATA_INLINE       0x00000200

/* Multiple files in block.  Set EXTENT_NOT_ALIGNED.  */
# define FIEMAP_EXTENT_DATA_TAIL         0x00000400

/* Space allocated, but not data (i.e. zero).  */
# define FIEMAP_EXTENT_UNWRITTEN         0x00000800

/* File does not natively support extents.  Result merged for efficiency.  */
# define FIEMAP_EXTENT_MERGED		0x00001000

/* Space shared with other files.  */
# define FIEMAP_EXTENT_SHARED            0x00002000

#endif
