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#define FIEMAP_FLAG_CACHE	0x00000004 /* request caching of the extents */
44
45#define FIEMAP_FLAGS_COMPAT	(FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
46
47#define FIEMAP_EXTENT_LAST		0x00000001 /* Last extent in file. */
48#define FIEMAP_EXTENT_UNKNOWN		0x00000002 /* Data location unknown. */
49#define FIEMAP_EXTENT_DELALLOC		0x00000004 /* Location still pending.
50						    * Sets EXTENT_UNKNOWN. */
51#define FIEMAP_EXTENT_ENCODED		0x00000008 /* Data can not be read
52						    * while fs is unmounted */
53#define FIEMAP_EXTENT_DATA_ENCRYPTED	0x00000080 /* Data is encrypted by fs.
54						    * Sets EXTENT_NO_BYPASS. */
55#define FIEMAP_EXTENT_NOT_ALIGNED	0x00000100 /* Extent offsets may not be
56						    * block aligned. */
57#define FIEMAP_EXTENT_DATA_INLINE	0x00000200 /* Data mixed with metadata.
58						    * Sets EXTENT_NOT_ALIGNED.*/
59#define FIEMAP_EXTENT_DATA_TAIL		0x00000400 /* Multiple files in block.
60						    * Sets EXTENT_NOT_ALIGNED.*/
61#define FIEMAP_EXTENT_UNWRITTEN		0x00000800 /* Space allocated, but
62						    * no data (i.e. zero). */
63#define FIEMAP_EXTENT_MERGED		0x00001000 /* File does not natively
64						    * support extents. Result
65						    * merged for efficiency. */
66#define FIEMAP_EXTENT_SHARED		0x00002000 /* Space shared with other
67						    * files. */
68
69#endif /* _LINUX_FIEMAP_H */
70