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/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 }