sys/kern/vfs_vfsops.c

   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_MPLOCK(mp);
  93         error = (mp->mnt_op->vfs_mount)(mp, path, data, cred);
  94         VFS_MPUNLOCK(mp);
  95
  96         return (error);
  97 }
  98
  99 /*
 100  * MPSAFE
 101  */
 102 int
 103 vfs_start(struct mount *mp, int flags)
 104 {
 105         VFS_MPLOCK_DECLARE;
 106         int error;
 107
 108         VFS_MPLOCK_FLAG(mp, MNTK_ST_MPSAFE);
 109         error = (mp->mnt_op->vfs_start)(mp, flags);
 110         if (error == 0) {
 111                 /* do not call vfs_acinit on mount updates */
 112                 if ((mp->mnt_flag & MNT_UPDATE) == 0)
 113                         VFS_ACINIT(mp,error);
 114         }
 115         VFS_MPUNLOCK(mp);
 116         if (error == EMOUNTEXIT)
 117                 error = 0;
 118         return (error);
 119 }
 120
 121 /*
 122  * MPSAFE
 123  */
 124 int
 125 vfs_unmount(struct mount *mp, int mntflags)
 126 {
 127         VFS_MPLOCK_DECLARE;
 128         int error;
 129         int flags;
 130
 131         VFS_MPLOCK(mp);
 132         VFS_ACDONE(mp);
 133         flags = mp->mnt_kern_flag;
 134         error = (mp->mnt_op->vfs_unmount)(mp, mntflags);
 135         if (error == 0)
 136                 vn_syncer_thr_stop(mp);
 137         VFS_MPUNLOCK(mp);
 138         return (error);
 139 }
 140
 141 /*
 142  * MPSAFE
 143  */
 144 int
 145 vfs_root(struct mount *mp, struct vnode **vpp)
 146 {
 147         VFS_MPLOCK_DECLARE;
 148         int error;
 149
 150         VFS_MPLOCK(mp);
 151         error = (mp->mnt_op->vfs_root)(mp, vpp);
 152         VFS_MPUNLOCK(mp);
 153         return (error);
 154 }
 155
 156 /*
 157  * MPSAFE
 158  */
 159 int
 160 vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
 161              struct ucred *cred)
 162 {
 163         VFS_MPLOCK_DECLARE;
 164         int error;
 165
 166         VFS_MPLOCK(mp);
 167         error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred);
 168         VFS_MPUNLOCK(mp);
 169         return (error);
 170 }
 171
 172 /*
 173  * MPSAFE
 174  */
 175 int
 176 vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 177 {
 178         VFS_MPLOCK_DECLARE;
 179         int error;
 180
 181         VFS_MPLOCK(mp);
 182         error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred);
 183         VFS_MPUNLOCK(mp);
 184         return (error);
 185 }
 186
 187 /*
 188  * MPSAFE
 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_MPLOCK(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_MPLOCK(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_MPLOCK(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_MPLOCK(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_MPLOCK(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_MPLOCK(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         error = (vfc->vfc_vfsops->vfs_init)(vfc);
 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         error = (vfc->vfc_vfsops->vfs_uninit)(vfsp);
 301
 302         return (error);
 303 }
 304
 305 /*
 306  * MPSAFE
 307  */
 308 int
 309 vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
 310                  int attrnamespace, const char *attrname,
 311                  struct ucred *cred)
 312 {
 313         VFS_MPLOCK_DECLARE;
 314         int error;
 315
 316         VFS_MPLOCK(mp);
 317         error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, vp,
 318                                              attrnamespace, attrname,
 319                                              cred);
 320         VFS_MPUNLOCK(mp);
 321         return (error);
 322 }