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1 | /* |
2 | * Copyright (c) 2016 Apple Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_LICENSE_HEADER_START@ | |
5 | * | |
6 | * This file contains Original Code and/or Modifications of Original Code | |
7 | * as defined in and that are subject to the Apple Public Source License | |
8 | * Version 2.0 (the 'License'). You may not use this file except in | |
9 | * compliance with the License. Please obtain a copy of the License at | |
10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
11 | * file. | |
12 | * | |
13 | * The Original Code and all software distributed under the License are | |
14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
18 | * Please see the License for the specific language governing rights and | |
19 | * limitations under the License. | |
20 | * | |
21 | * @APPLE_LICENSE_HEADER_END@ | |
22 | */ | |
23 | ||
24 | #include <sys/snapshot.h> | |
25 | #include <sys/attr.h> | |
26 | #include <unistd.h> | |
27 | #include <errno.h> | |
28 | #include <stdint.h> | |
29 | #include <stdlib.h> | |
30 | ||
31 | extern int __fs_snapshot(uint32_t, int, const char *, const char *, void *, | |
32 | uint32_t); | |
33 | ||
34 | int | |
35 | fs_snapshot_create(int dirfd, const char *name, uint32_t flags) | |
36 | { | |
37 | return __fs_snapshot(SNAPSHOT_OP_CREATE, dirfd, name, NULL, NULL, flags); | |
38 | } | |
39 | ||
40 | int | |
41 | fs_snapshot_list(int dirfd, struct attrlist *alist, void *attrbuf, size_t bufsize, | |
42 | uint32_t flags) | |
43 | { | |
44 | if (flags != 0) { | |
45 | errno = EINVAL; | |
46 | return (-1); | |
47 | } | |
48 | ||
49 | return (getattrlistbulk(dirfd, alist, attrbuf, bufsize, | |
50 | FSOPT_LIST_SNAPSHOT)); | |
51 | } | |
52 | ||
53 | int | |
54 | fs_snapshot_delete(int dirfd, const char *name, uint32_t flags) | |
55 | { | |
56 | return __fs_snapshot(SNAPSHOT_OP_DELETE, dirfd, name, NULL, NULL, flags); | |
57 | } | |
58 | ||
59 | int | |
60 | fs_snapshot_rename(int dirfd, const char *old, const char *new, uint32_t flags) | |
61 | { | |
62 | return __fs_snapshot(SNAPSHOT_OP_RENAME, dirfd, old, new, NULL, flags); | |
63 | } | |
64 | ||
65 | int | |
66 | fs_snapshot_revert(int dirfd, const char *name, uint32_t flags) | |
67 | { | |
68 | return __fs_snapshot(SNAPSHOT_OP_REVERT, dirfd, name, NULL, NULL, flags); | |
69 | } | |
70 | ||
71 | /* | |
72 | * XXX Temporary hack to do what mount_apfs(8) does. This will be removed and | |
73 | * replaced with a VFS_IOCTL based implementation in the kernel. | |
74 | */ | |
75 | #include <sys/stat.h> | |
76 | #include "strings.h" | |
77 | ||
78 | #ifndef SNAPSHOT_OP_MOUNT | |
79 | #define SNAPSHOT_OP_MOUNT 0x4 | |
80 | #endif | |
81 | ||
82 | #define FS_MOUNT_SNAPSHOT 2 | |
83 | #define MAX_SNAPSHOT_NAMELEN 256 | |
84 | ||
85 | struct fs_mount_options { | |
86 | uint32_t fs_flags; | |
87 | uint8_t _padding_[2]; | |
88 | }; | |
89 | ||
90 | struct fs_mount_args { | |
91 | char *specdev; | |
92 | struct fs_mount_options options; | |
93 | uint16_t mode; | |
94 | uint16_t _padding_[3]; | |
95 | union { | |
96 | struct { // FS_MOUNT_SNAPSHOT | |
97 | dev_t snap_fsys; | |
98 | char snap_name[MAX_SNAPSHOT_NAMELEN]; | |
99 | }; | |
100 | struct { // APFS_MOUNT_FOR_CONVERSION | |
101 | }; | |
102 | }; | |
103 | }; | |
104 | ||
105 | int | |
106 | fs_snapshot_mount(int dirfd, const char *dir, const char *snapshot, | |
107 | uint32_t flags) | |
108 | { | |
109 | struct stat st; | |
110 | struct fs_mount_args mnt_args; | |
111 | ||
112 | mnt_args.specdev = NULL; | |
113 | mnt_args.mode = FS_MOUNT_SNAPSHOT; | |
114 | if (fstat(dirfd, &st) == -1) | |
115 | return (-1); | |
116 | ||
117 | mnt_args.snap_fsys = st.st_dev; | |
118 | strlcpy(mnt_args.snap_name, snapshot, sizeof(mnt_args.snap_name)); | |
119 | return (__fs_snapshot(SNAPSHOT_OP_MOUNT, dirfd, snapshot, dir, | |
120 | (void *)&mnt_args, flags)); | |
121 | } |