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