ceph/src/include/linux_fiemap.h

   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 #ifndef _LINUX_FIEMAP_H
  11 #define _LINUX_FIEMAP_H
  12
  13 #if defined(__linux__)
  14 #include <linux/types.h>
  15 #elif defined(__FreeBSD_)
  16 #include <sys/types.h>
  17 #endif
  18
  19 #include "include/int_types.h"
  20
  21 struct fiemap_extent {
  22         __u64 fe_logical;  /* logical offset in bytes for the start of
  23                             * the extent from the beginning of the file */
  24         __u64 fe_physical; /* physical offset in bytes for the start
  25                             * of the extent from the beginning of the disk */
  26         __u64 fe_length;   /* length in bytes for this extent */
  27         __u64 fe_reserved64[2];
  28         __u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
  29         __u32 fe_reserved[3];
  30 };
  31
  32 struct fiemap {
  33         __u64 fm_start;         /* logical offset (inclusive) at
  34                                  * which to start mapping (in) */
  35         __u64 fm_length;        /* logical length of mapping which
  36                                  * userspace wants (in) */
  37         __u32 fm_flags;         /* FIEMAP_FLAG_* flags for request (in/out) */
  38         __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
  39         __u32 fm_extent_count;  /* size of fm_extents array (in) */
  40         __u32 fm_reserved;
  41         struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
  42 };
  43
  44 #define FIEMAP_MAX_OFFSET       (~0ULL)
  45
  46 #define FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
  47 #define FIEMAP_FLAG_XATTR       0x00000002 /* map extended attribute tree */
  48
  49 #define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
  50
  51 #define FIEMAP_EXTENT_LAST              0x00000001 /* Last extent in file. */
  52 #define FIEMAP_EXTENT_UNKNOWN           0x00000002 /* Data location unknown. */
  53 #define FIEMAP_EXTENT_DELALLOC          0x00000004 /* Location still pending.
  54                                                     * Sets EXTENT_UNKNOWN. */
  55 #define FIEMAP_EXTENT_ENCODED           0x00000008 /* Data can not be read
  56                                                     * while fs is unmounted */
  57 #define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080 /* Data is encrypted by fs.
  58                                                     * Sets EXTENT_NO_BYPASS. */
  59 #define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100 /* Extent offsets may not be
  60                                                     * block aligned. */
  61 #define FIEMAP_EXTENT_DATA_INLINE       0x00000200 /* Data mixed with metadata.
  62                                                     * Sets EXTENT_NOT_ALIGNED.*/
  63 #define FIEMAP_EXTENT_DATA_TAIL         0x00000400 /* Multiple files in block.
  64                                                     * Sets EXTENT_NOT_ALIGNED.*/
  65 #define FIEMAP_EXTENT_UNWRITTEN         0x00000800 /* Space allocated, but
  66                                                     * no data (i.e. zero). */
  67 #define FIEMAP_EXTENT_MERGED            0x00001000 /* File does not natively
  68                                                     * support extents. Result
  69                                                     * merged for efficiency. */
  70 #define FIEMAP_EXTENT_SHARED            0x00002000 /* Space shared with other
  71                                                     * files. */
  72
  73 #endif /* _LINUX_FIEMAP_H */