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_MPLOCK_FLAG(mp, MNTK_ST_MPSAFE); 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 VFS_ACINIT(mp,error); 119 VFS_MPUNLOCK(mp); 120 if (error == EMOUNTEXIT) 121 error = 0; 122 return (error); 123 } 124 125 /* 126 * MPSAFE 127 */ 128 int 129 vfs_unmount(struct mount *mp, int mntflags) 130 { 131 VFS_MPLOCK_DECLARE; 132 int error; 133 int flags; 134 void *ctx; 135 136 VFS_MPLOCK1(mp); 137 VFS_ACDONE(mp); 138 flags = mp->mnt_kern_flag; 139 ctx = vn_syncer_thr_getctx(mp); 140 error = (mp->mnt_op->vfs_unmount)(mp, mntflags); 141 if (error == 0 && 142 flags & MNTK_THR_SYNC) 143 vn_syncer_thr_stop(ctx); 144 VFS_MPUNLOCK(mp); 145 return (error); 146 } 147 148 /* 149 * MPSAFE 150 */ 151 int 152 vfs_root(struct mount *mp, struct vnode **vpp) 153 { 154 VFS_MPLOCK_DECLARE; 155 int error; 156 157 VFS_MPLOCK1(mp); 158 error = (mp->mnt_op->vfs_root)(mp, vpp); 159 VFS_MPUNLOCK(mp); 160 return (error); 161 } 162 163 /* 164 * MPSAFE 165 */ 166 int 167 vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 168 struct ucred *cred) 169 { 170 VFS_MPLOCK_DECLARE; 171 int error; 172 173 VFS_MPLOCK1(mp); 174 error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred); 175 VFS_MPUNLOCK(mp); 176 return (error); 177 } 178 179 /* 180 * MPSAFE 181 */ 182 int 183 vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 184 { 185 VFS_MPLOCK_DECLARE; 186 int error; 187 188 VFS_MPLOCK1(mp); 189 error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred); 190 VFS_MPUNLOCK(mp); 191 return (error); 192 } 193 194 int 195 vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 196 { 197 VFS_MPLOCK_DECLARE; 198 int error; 199 200 VFS_MPLOCK1(mp); 201 error = (mp->mnt_op->vfs_statvfs)(mp, sbp, cred); 202 VFS_MPUNLOCK(mp); 203 return (error); 204 } 205 206 /* 207 * MPSAFE 208 */ 209 int 210 vfs_sync(struct mount *mp, int waitfor) 211 { 212 VFS_MPLOCK_DECLARE; 213 int error; 214 215 VFS_MPLOCK1(mp); 216 error = (mp->mnt_op->vfs_sync)(mp, waitfor); 217 VFS_MPUNLOCK(mp); 218 return (error); 219 } 220 221 /* 222 * MPSAFE 223 */ 224 int 225 vfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 226 { 227 VFS_MPLOCK_DECLARE; 228 int error; 229 230 VFS_MPLOCK1(mp); 231 error = (mp->mnt_op->vfs_vget)(mp, dvp, ino, vpp); 232 VFS_MPUNLOCK(mp); 233 return (error); 234 } 235 236 /* 237 * MPSAFE 238 */ 239 int 240 vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 241 struct fid *fhp, struct vnode **vpp) 242 { 243 VFS_MPLOCK_DECLARE; 244 int error; 245 246 VFS_MPLOCK1(mp); 247 error = (mp->mnt_op->vfs_fhtovp)(mp, rootvp, fhp, vpp); 248 VFS_MPUNLOCK(mp); 249 return (error); 250 } 251 252 /* 253 * MPSAFE 254 */ 255 int 256 vfs_checkexp(struct mount *mp, struct sockaddr *nam, 257 int *extflagsp, struct ucred **credanonp) 258 { 259 VFS_MPLOCK_DECLARE; 260 int error; 261 262 VFS_MPLOCK1(mp); 263 error = (mp->mnt_op->vfs_checkexp)(mp, nam, extflagsp, credanonp); 264 VFS_MPUNLOCK(mp); 265 return (error); 266 } 267 268 /* 269 * MPSAFE 270 */ 271 int 272 vfs_vptofh(struct vnode *vp, struct fid *fhp) 273 { 274 VFS_MPLOCK_DECLARE; 275 int error; 276 277 VFS_MPLOCK1(vp->v_mount); 278 error = (vp->v_mount->mnt_op->vfs_vptofh)(vp, fhp); 279 VFS_MPUNLOCK(vp->v_mount); 280 return (error); 281 } 282 283 /* 284 * MPSAFE 285 */ 286 int 287 vfs_init(struct vfsconf *vfc) 288 { 289 int error; 290 291 get_mplock(); 292 error = (vfc->vfc_vfsops->vfs_init)(vfc); 293 rel_mplock(); 294 295 return (error); 296 } 297 298 /* 299 * MPSAFE 300 */ 301 int 302 vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp) 303 { 304 int error; 305 306 get_mplock(); 307 error = (vfc->vfc_vfsops->vfs_uninit)(vfsp); 308 rel_mplock(); 309 310 return (error); 311 } 312 313 /* 314 * MPSAFE 315 */ 316 int 317 vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp, 318 int attrnamespace, const char *attrname, 319 struct ucred *cred) 320 { 321 VFS_MPLOCK_DECLARE; 322 int error; 323 324 VFS_MPLOCK1(mp); 325 error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, vp, 326 attrnamespace, attrname, 327 cred); 328 VFS_MPUNLOCK(mp); 329 return (error); 330 } 331