1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * This file contains interface definitions and wrappers for file
29 * system snapshot support. File systems may depend on this module
30 * for symbol resolution while the implementation may remain unloaded
31 * until needed.
32 */
33 #include <sys/types.h>
34 #include <sys/debug.h>
35 #include <sys/t_lock.h>
36 #include <sys/param.h>
37 #include <sys/mman.h>
38 #include <sys/systm.h>
39 #include <sys/errno.h>
40 #include <sys/kmem.h>
41 #include <sys/cmn_err.h>
42 #include <sys/vnode.h>
43 #include <sys/debug.h>
44 #include <sys/proc.h>
45 #include <sys/user.h>
46 #include <sys/conf.h>
47 #include <sys/modctl.h>
48 #include <sys/fssnap_if.h>
49
50 struct fssnap_operations snapops = {
51 NULL, /* fssnap_create */
52 NULL, /* fssnap_set_candidate */
53 NULL, /* fssnap_is_candidate */
54 NULL, /* fssnap_create_done */
55 NULL, /* fssnap_delete */
56 NULL /* fssnap_strategy */
57 };
58
59 void *
fssnap_create(chunknumber_t nchunks,uint_t chunksz,u_offset_t maxsize,struct vnode * fsvp,int backfilecount,struct vnode ** bfvpp,char * backpath,u_offset_t max_backfile_size)60 fssnap_create(chunknumber_t nchunks, uint_t chunksz, u_offset_t maxsize,
61 struct vnode *fsvp, int backfilecount, struct vnode **bfvpp, char *backpath,
62 u_offset_t max_backfile_size)
63 {
64 void *snapid = NULL;
65
66 if (snapops.fssnap_create)
67 snapid = (snapops.fssnap_create)(nchunks, chunksz, maxsize,
68 fsvp, backfilecount, bfvpp, backpath, max_backfile_size);
69
70 return (snapid);
71 }
72
73 void
fssnap_set_candidate(void * snapshot_id,chunknumber_t chunknumber)74 fssnap_set_candidate(void *snapshot_id, chunknumber_t chunknumber)
75 {
76 if (snapops.fssnap_set_candidate)
77 (snapops.fssnap_set_candidate)(snapshot_id, chunknumber);
78 }
79
80 int
fssnap_is_candidate(void * snapshot_id,u_offset_t off)81 fssnap_is_candidate(void *snapshot_id, u_offset_t off)
82 {
83 int rc = 0;
84
85 if (snapops.fssnap_is_candidate)
86 rc = (snapops.fssnap_is_candidate)(snapshot_id, off);
87
88 return (rc);
89 }
90
91 int
fssnap_create_done(void * snapshot_id)92 fssnap_create_done(void *snapshot_id)
93 {
94 int snapslot = -1;
95
96 if (snapops.fssnap_create_done)
97 snapslot = (snapops.fssnap_create_done)(snapshot_id);
98
99 return (snapslot);
100 }
101
102 int
fssnap_delete(void * snapshot_id)103 fssnap_delete(void *snapshot_id)
104 {
105 int snapslot = -1;
106
107 if (snapops.fssnap_delete)
108 snapslot = (snapops.fssnap_delete)(snapshot_id);
109
110 return (snapslot);
111 }
112
113 void
fssnap_strategy(void * snapshot_id,struct buf * bp)114 fssnap_strategy(void *snapshot_id, struct buf *bp)
115 {
116 if (snapops.fssnap_strategy)
117 (snapops.fssnap_strategy)(snapshot_id, bp);
118 }
119
120
121 #include <sys/modctl.h>
122
123 extern struct mod_ops mod_miscops;
124
125 static struct modlmisc modlmisc = {
126 &mod_miscops, "File System Snapshot Interface",
127 };
128
129 static struct modlinkage modlinkage = {
130 MODREV_1, (void *)&modlmisc, NULL
131 };
132
133 int
_init(void)134 _init(void)
135 {
136 return (mod_install(&modlinkage));
137 }
138
139 /*
140 * Unloading is MT-safe because our client drivers use
141 * the _depends_on[] mechanism - we won't go while they're
142 * still around.
143 */
144 int
_fini(void)145 _fini(void)
146 {
147 return (mod_remove(&modlinkage));
148 }
149
150 int
_info(struct modinfo * modinfop)151 _info(struct modinfo *modinfop)
152 {
153 return (mod_info(&modlinkage, modinfop));
154 }
155