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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
31extern int __fs_snapshot(uint32_t, int, const char *, const char *, void *,
32 uint32_t);
33
34int
35fs_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
40int
41fs_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
53int
54fs_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
59int
60fs_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
65int
66fs_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
85struct fs_mount_options {
86 uint32_t fs_flags;
87 uint8_t _padding_[2];
88};
89
90struct 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
105int
106fs_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}