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