fiemap.h revision 65f0aab98b20b5994a726ab90d355248bcddfffd 
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
14struct 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
25struct 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 */
65