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/reboot.h> 56 #include <sys/socket.h> 57 #include <sys/stat.h> 58 #include <sys/sysctl.h> 59 #include <sys/syslog.h> 60 #include <sys/vmmeter.h> 61 #include <sys/vnode.h> 62 #include <sys/vfsops.h> 63 #include <sys/sysmsg.h> 64 65 #include <machine/limits.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_object.h> 69 #include <vm/vm_extern.h> 70 #include <vm/vm_kern.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_map.h> 73 #include <vm/vm_page.h> 74 #include <vm/vm_pager.h> 75 #include <vm/vnode_pager.h> 76 #include <vm/vm_zone.h> 77 78 #include <sys/buf2.h> 79 80 /* 81 * MPSAFE 82 */ 83 int 84 vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 85 { 86 VFS_MPLOCK_DECLARE; 87 int error; 88 89 VFS_MPLOCK(mp); 90 if (!mp->mnt_cred) 91 mp->mnt_cred = crhold(cred); /* For cr_prison */ 92 error = (mp->mnt_op->vfs_mount)(mp, path, data, cred); 93 VFS_MPUNLOCK(); 94 95 return (error); 96 } 97 98 /* 99 * MPSAFE 100 */ 101 int 102 vfs_start(struct mount *mp, int flags) 103 { 104 VFS_MPLOCK_DECLARE; 105 int error; 106 107 VFS_MPLOCK_FLAG(mp, MNTK_ST_MPSAFE); 108 error = (mp->mnt_op->vfs_start)(mp, flags); 109 if (error == 0) { 110 /* do not call vfs_acinit on mount updates */ 111 if ((mp->mnt_flag & MNT_UPDATE) == 0) 112 VFS_ACINIT(mp,error); 113 } 114 VFS_MPUNLOCK(); 115 if (error == EMOUNTEXIT) 116 error = 0; 117 return (error); 118 } 119 120 /* 121 * MPSAFE 122 */ 123 int 124 vfs_unmount(struct mount *mp, int mntflags) 125 { 126 VFS_MPLOCK_DECLARE; 127 int error; 128 int flags; 129 130 VFS_MPLOCK(mp); 131 VFS_ACDONE(mp); 132 flags = mp->mnt_kern_flag; 133 error = (mp->mnt_op->vfs_unmount)(mp, mntflags); 134 if (error == 0) 135 vn_syncer_thr_stop(mp); 136 VFS_MPUNLOCK(); 137 return (error); 138 } 139 140 /* 141 * MPSAFE 142 */ 143 int 144 vfs_root(struct mount *mp, struct vnode **vpp) 145 { 146 VFS_MPLOCK_DECLARE; 147 int error; 148 149 VFS_MPLOCK(mp); 150 error = (mp->mnt_op->vfs_root)(mp, vpp); 151 VFS_MPUNLOCK(); 152 return (error); 153 } 154 155 /* 156 * MPSAFE 157 */ 158 int 159 vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 160 struct ucred *cred) 161 { 162 VFS_MPLOCK_DECLARE; 163 int error; 164 165 VFS_MPLOCK(mp); 166 error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred); 167 VFS_MPUNLOCK(); 168 return (error); 169 } 170 171 /* 172 * MPSAFE 173 */ 174 int 175 vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 176 { 177 VFS_MPLOCK_DECLARE; 178 int error; 179 180 VFS_MPLOCK(mp); 181 error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred); 182 VFS_MPUNLOCK(); 183 return (error); 184 } 185 186 /* 187 * MPSAFE 188 */ 189 int 190 vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 191 { 192 VFS_MPLOCK_DECLARE; 193 int error; 194 195 VFS_MPLOCK(mp); 196 error = (mp->mnt_op->vfs_statvfs)(mp, sbp, cred); 197 VFS_MPUNLOCK(); 198 return (error); 199 } 200 201 /* 202 * MPSAFE 203 */ 204 int 205 vfs_sync(struct mount *mp, int waitfor) 206 { 207 VFS_MPLOCK_DECLARE; 208 int error; 209 210 VFS_MPLOCK(mp); 211 error = (mp->mnt_op->vfs_sync)(mp, waitfor); 212 VFS_MPUNLOCK(); 213 return (error); 214 } 215 216 /* 217 * MPSAFE 218 */ 219 int 220 vfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 221 { 222 VFS_MPLOCK_DECLARE; 223 int error; 224 225 VFS_MPLOCK(mp); 226 error = (mp->mnt_op->vfs_vget)(mp, dvp, ino, vpp); 227 VFS_MPUNLOCK(); 228 return (error); 229 } 230 231 /* 232 * MPSAFE 233 */ 234 int 235 vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 236 struct fid *fhp, struct vnode **vpp) 237 { 238 VFS_MPLOCK_DECLARE; 239 int error; 240 241 VFS_MPLOCK(mp); 242 error = (mp->mnt_op->vfs_fhtovp)(mp, rootvp, fhp, vpp); 243 VFS_MPUNLOCK(); 244 return (error); 245 } 246 247 /* 248 * MPSAFE 249 */ 250 int 251 vfs_checkexp(struct mount *mp, struct sockaddr *nam, 252 int *extflagsp, struct ucred **credanonp) 253 { 254 VFS_MPLOCK_DECLARE; 255 int error; 256 257 VFS_MPLOCK(mp); 258 error = (mp->mnt_op->vfs_checkexp)(mp, nam, extflagsp, credanonp); 259 VFS_MPUNLOCK(); 260 return (error); 261 } 262 263 /* 264 * MPSAFE 265 */ 266 int 267 vfs_vptofh(struct vnode *vp, struct fid *fhp) 268 { 269 VFS_MPLOCK_DECLARE; 270 int error; 271 272 VFS_MPLOCK(vp->v_mount); 273 error = (vp->v_mount->mnt_op->vfs_vptofh)(vp, fhp); 274 VFS_MPUNLOCK(); 275 return (error); 276 } 277 278 /* 279 * MPSAFE 280 */ 281 int 282 vfs_init(struct vfsconf *vfc) 283 { 284 int error; 285 286 error = (vfc->vfc_vfsops->vfs_init)(vfc); 287 288 return (error); 289 } 290 291 /* 292 * MPSAFE 293 */ 294 int 295 vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp) 296 { 297 int error; 298 299 error = (vfc->vfc_vfsops->vfs_uninit)(vfsp); 300 301 return (error); 302 } 303 304 /* 305 * MPSAFE 306 */ 307 int 308 vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp, 309 int attrnamespace, const char *attrname, 310 struct ucred *cred) 311 { 312 VFS_MPLOCK_DECLARE; 313 int error; 314 315 VFS_MPLOCK(mp); 316 error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, vp, 317 attrnamespace, attrname, 318 cred); 319 VFS_MPUNLOCK(); 320 return (error); 321 } 322