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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * FS_IOC_FIEMAP ioctl infrastructure.
4 *
5 * Some portions copyright (C) 2007 Cluster File Systems, Inc
6 *
7 * Authors: Mark Fasheh <mfasheh@suse.com>
8 * Kalpak Shah <kalpak.shah@sun.com>
9 * Andreas Dilger <adilger@sun.com>
10 */
11
12#ifndef _LINUX_FIEMAP_H
13#define _LINUX_FIEMAP_H
14
15#include <linux/types.h>
16
17/**
18 * struct fiemap_extent - description of one fiemap extent
19 * @fe_logical: byte offset of the extent in the file
20 * @fe_physical: byte offset of extent on disk
21 * @fe_length: length in bytes for this extent
22 * @fe_flags: FIEMAP_EXTENT_* flags for this extent
23 */
24struct fiemap_extent {
25 __u64 fe_logical;
26 __u64 fe_physical;
27 __u64 fe_length;
28 /* private: */
29 __u64 fe_reserved64[2];
30 /* public: */
31 __u32 fe_flags;
32 /* private: */
33 __u32 fe_reserved[3];
34};
35
36/**
37 * struct fiemap - file extent mappings
38 * @fm_start: byte offset (inclusive) at which to start mapping (in)
39 * @fm_length: logical length of mapping which userspace wants (in)
40 * @fm_flags: FIEMAP_FLAG_* flags for request (in/out)
41 * @fm_mapped_extents: number of extents that were mapped (out)
42 * @fm_extent_count: size of fm_extents array (in)
43 * @fm_extents: array of mapped extents (out)
44 */
45struct fiemap {
46 __u64 fm_start;
47 __u64 fm_length;
48 __u32 fm_flags;
49 __u32 fm_mapped_extents;
50 __u32 fm_extent_count;
51 /* private: */
52 __u32 fm_reserved;
53 /* public: */
54 struct fiemap_extent fm_extents[];
55};
56
57#define FIEMAP_MAX_OFFSET (~0ULL)
58
59/* flags used in fm_flags: */
60#define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
61#define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */
62#define FIEMAP_FLAG_CACHE 0x00000004 /* request caching of the extents */
63
64#define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
65
66/* flags used in fe_flags: */
67#define FIEMAP_EXTENT_LAST 0x00000001 /* Last extent in file. */
68#define FIEMAP_EXTENT_UNKNOWN 0x00000002 /* Data location unknown. */
69#define FIEMAP_EXTENT_DELALLOC 0x00000004 /* Location still pending.
70 * Sets EXTENT_UNKNOWN. */
71#define FIEMAP_EXTENT_ENCODED 0x00000008 /* Data can not be read
72 * while fs is unmounted */
73#define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
74 * Sets EXTENT_NO_BYPASS. */
75#define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
76 * block aligned. */
77#define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata.
78 * Sets EXTENT_NOT_ALIGNED.*/
79#define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block.
80 * Sets EXTENT_NOT_ALIGNED.*/
81#define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
82 * no data (i.e. zero). */
83#define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
84 * support extents. Result
85 * merged for efficiency. */
86#define FIEMAP_EXTENT_SHARED 0x00002000 /* Space shared with other
87 * files. */
88
89#endif /* _LINUX_FIEMAP_H */