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_MPLOCK1(mp);
  93         error = (mp->mnt_op->vfs_mount)(mp, path, data, cred);
  94         VFS_MPUNLOCK(mp);
  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_MPLOCK1(mp);
 108         error = (mp->mnt_op->vfs_start)(mp, flags);
 109         VFS_MPUNLOCK(mp);
 110         return (error);
 111 }
 112
 113 /*
 114  * MPSAFE
 115  */
 116 int
 117 vfs_unmount(struct mount *mp, int mntflags)
 118 {
 119         VFS_MPLOCK_DECLARE;
 120         int error;
 121
 122         VFS_MPLOCK1(mp);
 123         error = (mp->mnt_op->vfs_unmount)(mp, mntflags);
 124         VFS_MPUNLOCK(mp);
 125         return (error);
 126 }
 127
 128 /*
 129  * MPSAFE
 130  */
 131 int
 132 vfs_root(struct mount *mp, struct vnode **vpp)
 133 {
 134         VFS_MPLOCK_DECLARE;
 135         int error;
 136
 137         VFS_MPLOCK1(mp);
 138         error = (mp->mnt_op->vfs_root)(mp, vpp);
 139         VFS_MPUNLOCK(mp);
 140         return (error);
 141 }
 142
 143 /*
 144  * MPSAFE
 145  */
 146 int
 147 vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
 148              struct ucred *cred)
 149 {
 150         VFS_MPLOCK_DECLARE;
 151         int error;
 152
 153         VFS_MPLOCK1(mp);
 154         error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred);
 155         VFS_MPUNLOCK(mp);
 156         return (error);
 157 }
 158
 159 /*
 160  * MPSAFE
 161  */
 162 int
 163 vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 164 {
 165         VFS_MPLOCK_DECLARE;
 166         int error;
 167
 168         VFS_MPLOCK1(mp);
 169         error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred);
 170         VFS_MPUNLOCK(mp);
 171         return (error);
 172 }
 173
 174 int
 175 vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 176 {
 177         VFS_MPLOCK_DECLARE;
 178         int error;
 179
 180         VFS_MPLOCK1(mp);
 181         error = (mp->mnt_op->vfs_statvfs)(mp, sbp, cred);
 182         VFS_MPUNLOCK(mp);
 183         return (error);
 184 }
 185
 186 /*
 187  * MPSAFE
 188  */
 189 int
 190 vfs_sync(struct mount *mp, int waitfor)
 191 {
 192         VFS_MPLOCK_DECLARE;
 193         int error;
 194
 195         VFS_MPLOCK1(mp);
 196         error = (mp->mnt_op->vfs_sync)(mp, waitfor);
 197         VFS_MPUNLOCK(mp);
 198         return (error);
 199 }
 200
 201 /*
 202  * MPSAFE
 203  */
 204 int
 205 vfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
 206 {
 207         VFS_MPLOCK_DECLARE;
 208         int error;
 209
 210         VFS_MPLOCK1(mp);
 211         error = (mp->mnt_op->vfs_vget)(mp, dvp, ino, vpp);
 212         VFS_MPUNLOCK(mp);
 213         return (error);
 214 }
 215
 216 /*
 217  * MPSAFE
 218  */
 219 int
 220 vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 221            struct fid *fhp, struct vnode **vpp)
 222 {
 223         VFS_MPLOCK_DECLARE;
 224         int error;
 225
 226         VFS_MPLOCK1(mp);
 227         error = (mp->mnt_op->vfs_fhtovp)(mp, rootvp, fhp, vpp);
 228         VFS_MPUNLOCK(mp);
 229         return (error);
 230 }
 231
 232 /*
 233  * MPSAFE
 234  */
 235 int
 236 vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 237              int *extflagsp, struct ucred **credanonp)
 238 {
 239         VFS_MPLOCK_DECLARE;
 240         int error;
 241
 242         VFS_MPLOCK1(mp);
 243         error = (mp->mnt_op->vfs_checkexp)(mp, nam, extflagsp, credanonp);
 244         VFS_MPUNLOCK(mp);
 245         return (error);
 246 }
 247
 248 /*
 249  * MPSAFE
 250  */
 251 int
 252 vfs_vptofh(struct vnode *vp, struct fid *fhp)
 253 {
 254         VFS_MPLOCK_DECLARE;
 255         int error;
 256
 257         VFS_MPLOCK1(vp->v_mount);
 258         error = (vp->v_mount->mnt_op->vfs_vptofh)(vp, fhp);
 259         VFS_MPUNLOCK(vp->v_mount);
 260         return (error);
 261 }
 262
 263 /*
 264  * MPSAFE
 265  */
 266 int
 267 vfs_init(struct vfsconf *vfc)
 268 {
 269         int error;
 270
 271         get_mplock();
 272         error = (vfc->vfc_vfsops->vfs_init)(vfc);
 273         rel_mplock();
 274
 275         return (error);
 276 }
 277
 278 /*
 279  * MPSAFE
 280  */
 281 int
 282 vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp)
 283 {
 284         int error;
 285
 286         get_mplock();
 287         error = (vfc->vfc_vfsops->vfs_uninit)(vfsp);
 288         rel_mplock();
 289
 290         return (error);
 291 }
 292
 293 /*
 294  * MPSAFE
 295  */
 296 int
 297 vfs_extattrctl(struct mount *mp, int cmd, const char *attrname,
 298                caddr_t arg, struct ucred *cred)
 299 {
 300         VFS_MPLOCK_DECLARE;
 301         int error;
 302
 303         VFS_MPLOCK1(mp);
 304         error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, attrname, arg, cred);
 305         VFS_MPUNLOCK(mp);
 306         return (error);
 307 }