Revert "block: improve queue_should_plug() by looking at IO depths"
[linux-2.6.git] / 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 #include <linux/types.h>
15
16 struct 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
27 struct 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
44 #define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
45
46 #define FIEMAP_EXTENT_LAST              0x00000001 /* Last extent in file. */
47 #define FIEMAP_EXTENT_UNKNOWN           0x00000002 /* Data location unknown. */
48 #define FIEMAP_EXTENT_DELALLOC          0x00000004 /* Location still pending.
49                                                     * Sets EXTENT_UNKNOWN. */
50 #define FIEMAP_EXTENT_ENCODED           0x00000008 /* Data can not be read
51                                                     * while fs is unmounted */
52 #define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080 /* Data is encrypted by fs.
53                                                     * Sets EXTENT_NO_BYPASS. */
54 #define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100 /* Extent offsets may not be
55                                                     * block aligned. */
56 #define FIEMAP_EXTENT_DATA_INLINE       0x00000200 /* Data mixed with metadata.
57                                                     * Sets EXTENT_NOT_ALIGNED.*/
58 #define FIEMAP_EXTENT_DATA_TAIL         0x00000400 /* Multiple files in block.
59                                                     * Sets EXTENT_NOT_ALIGNED.*/
60 #define FIEMAP_EXTENT_UNWRITTEN         0x00000800 /* Space allocated, but
61                                                     * no data (i.e. zero). */
62 #define FIEMAP_EXTENT_MERGED            0x00001000 /* File does not natively
63                                                     * support extents. Result
64                                                     * merged for efficiency. */
65 #define FIEMAP_EXTENT_SHARED            0x00002000 /* Space shared with other
66                                                     * files. */
67
68 #endif /* _LINUX_FIEMAP_H */