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/mplock2.h> 81 82 /* 83 * MPSAFE 84 */ 85 int 86 vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 87 { 88 VFS_MPLOCK_DECLARE; 89 int error; 90 91 VFS_MPLOCK(mp); 92 if (!mp->mnt_cred) 93 mp->mnt_cred = crhold(cred); /* For cr_prison */ 94 error = (mp->mnt_op->vfs_mount)(mp, path, data, cred); 95 VFS_MPUNLOCK(); 96 97 return (error); 98 } 99 100 /* 101 * MPSAFE 102 */ 103 int 104 vfs_start(struct mount *mp, int flags) 105 { 106 VFS_MPLOCK_DECLARE; 107 int error; 108 109 VFS_MPLOCK_FLAG(mp, MNTK_ST_MPSAFE); 110 error = (mp->mnt_op->vfs_start)(mp, flags); 111 if (error == 0) { 112 /* do not call vfs_acinit on mount updates */ 113 if ((mp->mnt_flag & MNT_UPDATE) == 0) 114 VFS_ACINIT(mp,error); 115 } 116 VFS_MPUNLOCK(); 117 if (error == EMOUNTEXIT) 118 error = 0; 119 return (error); 120 } 121 122 /* 123 * MPSAFE 124 */ 125 int 126 vfs_unmount(struct mount *mp, int mntflags) 127 { 128 VFS_MPLOCK_DECLARE; 129 int error; 130 int flags; 131 132 VFS_MPLOCK(mp); 133 VFS_ACDONE(mp); 134 flags = mp->mnt_kern_flag; 135 error = (mp->mnt_op->vfs_unmount)(mp, mntflags); 136 if (error == 0) 137 vn_syncer_thr_stop(mp); 138 VFS_MPUNLOCK(); 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_MPLOCK(mp); 152 error = (mp->mnt_op->vfs_root)(mp, vpp); 153 VFS_MPUNLOCK(); 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_MPLOCK(mp); 168 error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred); 169 VFS_MPUNLOCK(); 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_MPLOCK(mp); 183 error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred); 184 VFS_MPUNLOCK(); 185 return (error); 186 } 187 188 /* 189 * MPSAFE 190 */ 191 int 192 vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 193 { 194 VFS_MPLOCK_DECLARE; 195 int error; 196 197 VFS_MPLOCK(mp); 198 error = (mp->mnt_op->vfs_statvfs)(mp, sbp, cred); 199 VFS_MPUNLOCK(); 200 return (error); 201 } 202 203 /* 204 * MPSAFE 205 */ 206 int 207 vfs_sync(struct mount *mp, int waitfor) 208 { 209 VFS_MPLOCK_DECLARE; 210 int error; 211 212 VFS_MPLOCK(mp); 213 error = (mp->mnt_op->vfs_sync)(mp, waitfor); 214 VFS_MPUNLOCK(); 215 return (error); 216 } 217 218 /* 219 * MPSAFE 220 */ 221 int 222 vfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 223 { 224 VFS_MPLOCK_DECLARE; 225 int error; 226 227 VFS_MPLOCK(mp); 228 error = (mp->mnt_op->vfs_vget)(mp, dvp, ino, vpp); 229 VFS_MPUNLOCK(); 230 return (error); 231 } 232 233 /* 234 * MPSAFE 235 */ 236 int 237 vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 238 struct fid *fhp, struct vnode **vpp) 239 { 240 VFS_MPLOCK_DECLARE; 241 int error; 242 243 VFS_MPLOCK(mp); 244 error = (mp->mnt_op->vfs_fhtovp)(mp, rootvp, fhp, vpp); 245 VFS_MPUNLOCK(); 246 return (error); 247 } 248 249 /* 250 * MPSAFE 251 */ 252 int 253 vfs_checkexp(struct mount *mp, struct sockaddr *nam, 254 int *extflagsp, struct ucred **credanonp) 255 { 256 VFS_MPLOCK_DECLARE; 257 int error; 258 259 VFS_MPLOCK(mp); 260 error = (mp->mnt_op->vfs_checkexp)(mp, nam, extflagsp, credanonp); 261 VFS_MPUNLOCK(); 262 return (error); 263 } 264 265 /* 266 * MPSAFE 267 */ 268 int 269 vfs_vptofh(struct vnode *vp, struct fid *fhp) 270 { 271 VFS_MPLOCK_DECLARE; 272 int error; 273 274 VFS_MPLOCK(vp->v_mount); 275 error = (vp->v_mount->mnt_op->vfs_vptofh)(vp, fhp); 276 VFS_MPUNLOCK(); 277 return (error); 278 } 279 280 /* 281 * MPSAFE 282 */ 283 int 284 vfs_init(struct vfsconf *vfc) 285 { 286 int error; 287 288 error = (vfc->vfc_vfsops->vfs_init)(vfc); 289 290 return (error); 291 } 292 293 /* 294 * MPSAFE 295 */ 296 int 297 vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp) 298 { 299 int error; 300 301 error = (vfc->vfc_vfsops->vfs_uninit)(vfsp); 302 303 return (error); 304 } 305 306 /* 307 * MPSAFE 308 */ 309 int 310 vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp, 311 int attrnamespace, const char *attrname, 312 struct ucred *cred) 313 { 314 VFS_MPLOCK_DECLARE; 315 int error; 316 317 VFS_MPLOCK(mp); 318 error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, vp, 319 attrnamespace, attrname, 320 cred); 321 VFS_MPUNLOCK(); 322 return (error); 323 } 324