1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
* Copyright (c) 2017 Oracle.
* All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef FSMAP_H_
#define FSMAP_H_
/* FS_IOC_GETFSMAP ioctl definitions */
#ifndef FS_IOC_GETFSMAP
struct fsmap {
__u32 fmr_device; /* device id */
__u32 fmr_flags; /* mapping flags */
__u64 fmr_physical; /* device offset of segment */
__u64 fmr_owner; /* owner id */
__u64 fmr_offset; /* file offset of segment */
__u64 fmr_length; /* length of segment */
__u64 fmr_reserved[3]; /* must be zero */
};
struct fsmap_head {
__u32 fmh_iflags; /* control flags */
__u32 fmh_oflags; /* output flags */
__u32 fmh_count; /* # of entries in array incl. input */
__u32 fmh_entries; /* # of entries filled in (output). */
__u64 fmh_reserved[6]; /* must be zero */
struct fsmap fmh_keys[2]; /* low and high keys for the mapping search */
struct fsmap fmh_recs[]; /* returned records */
};
/* Size of an fsmap_head with room for nr records. */
static inline size_t
fsmap_sizeof(
unsigned int nr)
{
return sizeof(struct fsmap_head) + nr * sizeof(struct fsmap);
}
/* Start the next fsmap query at the end of the current query results. */
static inline void
fsmap_advance(
struct fsmap_head *head)
{
head->fmh_keys[0] = head->fmh_recs[head->fmh_entries - 1];
}
/* fmh_iflags values - set by FS_IOC_GETFSMAP caller in the header. */
/* no flags defined yet */
#define FMH_IF_VALID 0
/* fmh_oflags values - returned in the header segment only. */
#define FMH_OF_DEV_T 0x1 /* fmr_device values will be dev_t */
/* fmr_flags values - returned for each non-header segment */
#define FMR_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */
#define FMR_OF_ATTR_FORK 0x2 /* segment = attribute fork */
#define FMR_OF_EXTENT_MAP 0x4 /* segment = extent map */
#define FMR_OF_SHARED 0x8 /* segment = shared with another file */
#define FMR_OF_SPECIAL_OWNER 0x10 /* owner is a special value */
#define FMR_OF_LAST 0x20 /* segment is the last in the FS */
/* Each FS gets to define its own special owner codes. */
#define FMR_OWNER(type, code) (((__u64)type << 32) | \
((__u64)code & 0xFFFFFFFFULL))
#define FMR_OWNER_TYPE(owner) ((__u32)((__u64)owner >> 32))
#define FMR_OWNER_CODE(owner) ((__u32)(((__u64)owner & 0xFFFFFFFFULL)))
#define FMR_OWN_FREE FMR_OWNER(0, 1) /* free space */
#define FMR_OWN_UNKNOWN FMR_OWNER(0, 2) /* unknown owner */
#define FMR_OWN_METADATA FMR_OWNER(0, 3) /* metadata */
#define FS_IOC_GETFSMAP _IOWR('X', 59, struct fsmap_head)
#endif /* FS_IOC_GETFSMAP */
#endif
|
