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 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * This file contains interface definitions and wrappers for file 31 * system snapshot support. File systems may depend on this module 32 * for symbol resolution while the implementation may remain unloaded 33 * until needed. 34 */ 35 #include <sys/types.h> 36 #include <sys/debug.h> 37 #include <sys/t_lock.h> 38 #include <sys/param.h> 39 #include <sys/mman.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/kmem.h> 43 #include <sys/cmn_err.h> 44 #include <sys/vnode.h> 45 #include <sys/debug.h> 46 #include <sys/proc.h> 47 #include <sys/user.h> 48 #include <sys/conf.h> 49 #include <sys/modctl.h> 50 #include <sys/fssnap_if.h> 51 52 struct fssnap_operations snapops = { 53 NULL, /* fssnap_create */ 54 NULL, /* fssnap_set_candidate */ 55 NULL, /* fssnap_is_candidate */ 56 NULL, /* fssnap_create_done */ 57 NULL, /* fssnap_delete */ 58 NULL /* fssnap_strategy */ 59 }; 60 61 void * 62 fssnap_create(chunknumber_t nchunks, uint_t chunksz, u_offset_t maxsize, 63 struct vnode *fsvp, int backfilecount, struct vnode **bfvpp, char *backpath, 64 u_offset_t max_backfile_size) 65 { 66 void *snapid = NULL; 67 68 if (snapops.fssnap_create) 69 snapid = (snapops.fssnap_create)(nchunks, chunksz, maxsize, 70 fsvp, backfilecount, bfvpp, backpath, max_backfile_size); 71 72 return (snapid); 73 } 74 75 void 76 fssnap_set_candidate(void *snapshot_id, chunknumber_t chunknumber) 77 { 78 if (snapops.fssnap_set_candidate) 79 (snapops.fssnap_set_candidate)(snapshot_id, chunknumber); 80 } 81 82 int 83 fssnap_is_candidate(void *snapshot_id, u_offset_t off) 84 { 85 int rc = 0; 86 87 if (snapops.fssnap_is_candidate) 88 rc = (snapops.fssnap_is_candidate)(snapshot_id, off); 89 90 return (rc); 91 } 92 93 int 94 fssnap_create_done(void *snapshot_id) 95 { 96 int snapslot = -1; 97 98 if (snapops.fssnap_create_done) 99 snapslot = (snapops.fssnap_create_done)(snapshot_id); 100 101 return (snapslot); 102 } 103 104 int 105 fssnap_delete(void *snapshot_id) 106 { 107 int snapslot = -1; 108 109 if (snapops.fssnap_delete) 110 snapslot = (snapops.fssnap_delete)(snapshot_id); 111 112 return (snapslot); 113 } 114 115 void 116 fssnap_strategy(void *snapshot_id, struct buf *bp) 117 { 118 if (snapops.fssnap_strategy) 119 (snapops.fssnap_strategy)(snapshot_id, bp); 120 } 121 122 123 #include <sys/modctl.h> 124 125 extern struct mod_ops mod_miscops; 126 127 static struct modlmisc modlmisc = { 128 &mod_miscops, "File System Snapshot Interface", 129 }; 130 131 static struct modlinkage modlinkage = { 132 MODREV_1, (void *)&modlmisc, NULL 133 }; 134 135 int 136 _init(void) 137 { 138 return (mod_install(&modlinkage)); 139 } 140 141 /* 142 * Unloading is MT-safe because our client drivers use 143 * the _depends_on[] mechanism - we won't go while they're 144 * still around. 145 */ 146 int 147 _fini(void) 148 { 149 return (mod_remove(&modlinkage)); 150 } 151 152 int 153 _info(struct modinfo *modinfop) 154 { 155 return (mod_info(&modlinkage, modinfop)); 156 } 157