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