1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 /* 35 * Implement mp->mnt_ops function call wrappers. 36 * 37 * These wrappers are responsible for handling all MPSAFE issues related to 38 * a mount. 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/buf.h> 44 #include <sys/conf.h> 45 #include <sys/dirent.h> 46 #include <sys/domain.h> 47 #include <sys/eventhandler.h> 48 #include <sys/fcntl.h> 49 #include <sys/kernel.h> 50 #include <sys/kthread.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/mount.h> 54 #include <sys/proc.h> 55 #include <sys/namei.h> 56 #include <sys/reboot.h> 57 #include <sys/socket.h> 58 #include <sys/stat.h> 59 #include <sys/sysctl.h> 60 #include <sys/syslog.h> 61 #include <sys/vmmeter.h> 62 #include <sys/vnode.h> 63 #include <sys/vfsops.h> 64 #include <sys/sysmsg.h> 65 66 #include <machine/limits.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_object.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vm_kern.h> 72 #include <vm/pmap.h> 73 #include <vm/vm_map.h> 74 #include <vm/vm_page.h> 75 #include <vm/vm_pager.h> 76 #include <vm/vnode_pager.h> 77 #include <vm/vm_zone.h> 78 79 #include <sys/buf2.h> 80 #include <sys/thread2.h> 81 #include <sys/mplock2.h> 82 83 /* 84 * MPSAFE 85 */ 86 int 87 vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 88 { 89 VFS_MPLOCK_DECLARE; 90 int error; 91 92 VFS_MPLOCK1(mp); 93 error = (mp->mnt_op->vfs_mount)(mp, path, data, cred); 94 if (error == 0) { 95 /* Create per-filesystem syncer threads if requested */ 96 if ((mp->mnt_flag & MNT_UPDATE) == 0 && 97 (mp->mnt_kern_flag & MNTK_THR_SYNC)) 98 vn_syncer_thr_create(mp); 99 } 100 VFS_MPUNLOCK(mp); 101 return (error); 102 } 103 104 /* 105 * MPSAFE 106 */ 107 int 108 vfs_start(struct mount *mp, int flags) 109 { 110 VFS_MPLOCK_DECLARE; 111 int error; 112 113 VFS_MPLOCK1(mp); 114 error = (mp->mnt_op->vfs_start)(mp, flags); 115 if (error == 0) 116 /* do not call vfs_acinit on mount updates */ 117 if ((mp->mnt_flag & MNT_UPDATE) == 0) 118 error = (mp->mnt_op->vfs_acinit)(mp); 119 VFS_MPUNLOCK(mp); 120 return (error); 121 } 122 123 /* 124 * MPSAFE 125 */ 126 int 127 vfs_unmount(struct mount *mp, int mntflags) 128 { 129 VFS_MPLOCK_DECLARE; 130 int error; 131 132 VFS_MPLOCK1(mp); 133 if (mp->mnt_kern_flag & MNTK_THR_SYNC) 134 vn_syncer_thr_stop(mp); 135 error = (mp->mnt_op->vfs_acdone)(mp); 136 if (error == 0) 137 error = (mp->mnt_op->vfs_unmount)(mp, mntflags); 138 VFS_MPUNLOCK(mp); 139 return (error); 140 } 141 142 /* 143 * MPSAFE 144 */ 145 int 146 vfs_root(struct mount *mp, struct vnode **vpp) 147 { 148 VFS_MPLOCK_DECLARE; 149 int error; 150 151 VFS_MPLOCK1(mp); 152 error = (mp->mnt_op->vfs_root)(mp, vpp); 153 VFS_MPUNLOCK(mp); 154 return (error); 155 } 156 157 /* 158 * MPSAFE 159 */ 160 int 161 vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 162 struct ucred *cred) 163 { 164 VFS_MPLOCK_DECLARE; 165 int error; 166 167 VFS_MPLOCK1(mp); 168 error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred); 169 VFS_MPUNLOCK(mp); 170 return (error); 171 } 172 173 /* 174 * MPSAFE 175 */ 176 int 177 vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 178 { 179 VFS_MPLOCK_DECLARE; 180 int error; 181 182 VFS_MPLOCK1(mp); 183 error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred); 184 VFS_MPUNLOCK(mp); 185 return (error); 186 } 187 188 int 189 vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 190 { 191 VFS_MPLOCK_DECLARE; 192 int error; 193 194 VFS_MPLOCK1(mp); 195 error = (mp->mnt_op->vfs_statvfs)(mp, sbp, cred); 196 VFS_MPUNLOCK(mp); 197 return (error); 198 } 199 200 /* 201 * MPSAFE 202 */ 203 int 204 vfs_sync(struct mount *mp, int waitfor) 205 { 206 VFS_MPLOCK_DECLARE; 207 int error; 208 209 VFS_MPLOCK1(mp); 210 error = (mp->mnt_op->vfs_sync)(mp, waitfor); 211 VFS_MPUNLOCK(mp); 212 return (error); 213 } 214 215 /* 216 * MPSAFE 217 */ 218 int 219 vfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 220 { 221 VFS_MPLOCK_DECLARE; 222 int error; 223 224 VFS_MPLOCK1(mp); 225 error = (mp->mnt_op->vfs_vget)(mp, dvp, ino, vpp); 226 VFS_MPUNLOCK(mp); 227 return (error); 228 } 229 230 /* 231 * MPSAFE 232 */ 233 int 234 vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 235 struct fid *fhp, struct vnode **vpp) 236 { 237 VFS_MPLOCK_DECLARE; 238 int error; 239 240 VFS_MPLOCK1(mp); 241 error = (mp->mnt_op->vfs_fhtovp)(mp, rootvp, fhp, vpp); 242 VFS_MPUNLOCK(mp); 243 return (error); 244 } 245 246 /* 247 * MPSAFE 248 */ 249 int 250 vfs_checkexp(struct mount *mp, struct sockaddr *nam, 251 int *extflagsp, struct ucred **credanonp) 252 { 253 VFS_MPLOCK_DECLARE; 254 int error; 255 256 VFS_MPLOCK1(mp); 257 error = (mp->mnt_op->vfs_checkexp)(mp, nam, extflagsp, credanonp); 258 VFS_MPUNLOCK(mp); 259 return (error); 260 } 261 262 /* 263 * MPSAFE 264 */ 265 int 266 vfs_vptofh(struct vnode *vp, struct fid *fhp) 267 { 268 VFS_MPLOCK_DECLARE; 269 int error; 270 271 VFS_MPLOCK1(vp->v_mount); 272 error = (vp->v_mount->mnt_op->vfs_vptofh)(vp, fhp); 273 VFS_MPUNLOCK(vp->v_mount); 274 return (error); 275 } 276 277 /* 278 * MPSAFE 279 */ 280 int 281 vfs_init(struct vfsconf *vfc) 282 { 283 int error; 284 285 get_mplock(); 286 error = (vfc->vfc_vfsops->vfs_init)(vfc); 287 rel_mplock(); 288 289 return (error); 290 } 291 292 /* 293 * MPSAFE 294 */ 295 int 296 vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp) 297 { 298 int error; 299 300 get_mplock(); 301 error = (vfc->vfc_vfsops->vfs_uninit)(vfsp); 302 rel_mplock(); 303 304 return (error); 305 } 306 307 /* 308 * MPSAFE 309 */ 310 int 311 vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp, 312 int attrnamespace, const char *attrname, 313 struct ucred *cred) 314 { 315 VFS_MPLOCK_DECLARE; 316 int error; 317 318 VFS_MPLOCK1(mp); 319 error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, vp, 320 attrnamespace, attrname, 321 cred); 322 VFS_MPUNLOCK(mp); 323 return (error); 324 } 325