devfs_vfsops.c

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    1 /*-
    2  * Copyright (c) 1992, 1993, 1995
    3  *      The Regents of the University of California.  All rights reserved.
    4  * Copyright (c) 2000
    5  *      Poul-Henning Kamp.  All rights reserved.
    6  *
    7  * This code is derived from software donated to Berkeley by
    8  * Jan-Simon Pendry.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)kernfs_vfsops.c     8.10 (Berkeley) 5/14/95
   32  * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
   33  *
   34  * $FreeBSD: releng/8.4/sys/fs/devfs/devfs_vfsops.c 233867 2012-04-04 09:14:16Z mm $
   35  */
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mount.h>
   43 #include <sys/proc.h>
   44 #include <sys/sx.h>
   45 #include <sys/vnode.h>
   46 #include <sys/limits.h>
   47 
   48 #include <fs/devfs/devfs.h>
   49 
   50 static struct unrhdr    *devfs_unr;
   51 
   52 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
   53 
   54 static vfs_mount_t      devfs_mount;
   55 static vfs_unmount_t    devfs_unmount;
   56 static vfs_root_t       devfs_root;
   57 static vfs_statfs_t     devfs_statfs;
   58 
   59 static const char *devfs_opts[] = {
   60         "from", "export", "ruleset", NULL
   61 };
   62 
   63 /*
   64  * Mount the filesystem
   65  */
   66 static int
   67 devfs_mount(struct mount *mp)
   68 {
   69         int error;
   70         struct devfs_mount *fmp;
   71         struct vnode *rvp;
   72         int rsnum;
   73 
   74         if (devfs_unr == NULL)
   75                 devfs_unr = new_unrhdr(0, INT_MAX, NULL);
   76 
   77         error = 0;
   78 
   79         if (mp->mnt_flag & MNT_ROOTFS)
   80                 return (EOPNOTSUPP);
   81 
   82         rsnum = 0;
   83 
   84         if (mp->mnt_optnew != NULL) {
   85                 if (vfs_filteropt(mp->mnt_optnew, devfs_opts))
   86                         return (EINVAL);
   87 
   88                 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
   89                         return (EOPNOTSUPP);
   90 
   91                 if (vfs_getopt(mp->mnt_optnew, "ruleset", NULL, NULL) == 0 &&
   92                     (vfs_scanopt(mp->mnt_optnew, "ruleset", "%d",
   93                     &rsnum) != 1 || rsnum < 0 || rsnum > 65535))
   94                         error = EINVAL;
   95         }
   96 
   97         if (error) {
   98                 vfs_mount_error(mp, "%s", "invalid ruleset specification");
   99                 return (error);
  100         }
  101 
  102         if (mp->mnt_flag & MNT_UPDATE) {
  103                 if (rsnum != 0) {
  104                         fmp = mp->mnt_data;
  105                         if (fmp != NULL) {
  106                                 sx_xlock(&fmp->dm_lock);
  107                                 devfs_ruleset_set((devfs_rsnum)rsnum, fmp);
  108                                 devfs_ruleset_apply(fmp);
  109                                 sx_xunlock(&fmp->dm_lock);
  110                         }
  111                 }
  112                 return (0);
  113         }
  114 
  115         fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO);
  116         fmp->dm_idx = alloc_unr(devfs_unr);
  117         sx_init(&fmp->dm_lock, "devfsmount");
  118         fmp->dm_holdcnt = 1;
  119 
  120         MNT_ILOCK(mp);
  121         mp->mnt_flag |= MNT_LOCAL;
  122         mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED |
  123             MNTK_EXTENDED_SHARED;
  124 #ifdef MAC
  125         mp->mnt_flag |= MNT_MULTILABEL;
  126 #endif
  127         MNT_IUNLOCK(mp);
  128         fmp->dm_mount = mp;
  129         mp->mnt_data = (void *) fmp;
  130         vfs_getnewfsid(mp);
  131 
  132         fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO);
  133 
  134         error = devfs_root(mp, LK_EXCLUSIVE, &rvp);
  135         if (error) {
  136                 sx_destroy(&fmp->dm_lock);
  137                 free_unr(devfs_unr, fmp->dm_idx);
  138                 free(fmp, M_DEVFS);
  139                 return (error);
  140         }
  141 
  142         if (rsnum != 0) {
  143                 sx_xlock(&fmp->dm_lock);
  144                 devfs_ruleset_set((devfs_rsnum)rsnum, fmp);
  145                 sx_xunlock(&fmp->dm_lock);
  146         }
  147 
  148         VOP_UNLOCK(rvp, 0);
  149 
  150         vfs_mountedfrom(mp, "devfs");
  151 
  152         return (0);
  153 }
  154 
  155 void
  156 devfs_unmount_final(struct devfs_mount *fmp)
  157 {
  158         sx_destroy(&fmp->dm_lock);
  159         free(fmp, M_DEVFS);
  160 }
  161 
  162 static int
  163 devfs_unmount(struct mount *mp, int mntflags)
  164 {
  165         int error;
  166         int flags = 0;
  167         struct devfs_mount *fmp;
  168         int hold;
  169         u_int idx;
  170 
  171         fmp = VFSTODEVFS(mp);
  172         KASSERT(fmp->dm_mount != NULL,
  173                 ("devfs_unmount unmounted devfs_mount"));
  174         /* There is 1 extra root vnode reference from devfs_mount(). */
  175         error = vflush(mp, 1, flags, curthread);
  176         if (error)
  177                 return (error);
  178         sx_xlock(&fmp->dm_lock);
  179         devfs_cleanup(fmp);
  180         devfs_rules_cleanup(fmp);
  181         fmp->dm_mount = NULL;
  182         hold = --fmp->dm_holdcnt;
  183         mp->mnt_data = NULL;
  184         idx = fmp->dm_idx;
  185         sx_xunlock(&fmp->dm_lock);
  186         free_unr(devfs_unr, idx);
  187         if (hold == 0)
  188                 devfs_unmount_final(fmp);
  189         return 0;
  190 }
  191 
  192 /* Return locked reference to root.  */
  193 
  194 static int
  195 devfs_root(struct mount *mp, int flags, struct vnode **vpp)
  196 {
  197         int error;
  198         struct vnode *vp;
  199         struct devfs_mount *dmp;
  200 
  201         dmp = VFSTODEVFS(mp);
  202         sx_xlock(&dmp->dm_lock);
  203         error = devfs_allocv(dmp->dm_rootdir, mp, LK_EXCLUSIVE, &vp);
  204         if (error)
  205                 return (error);
  206         vp->v_vflag |= VV_ROOT;
  207         *vpp = vp;
  208         return (0);
  209 }
  210 
  211 static int
  212 devfs_statfs(struct mount *mp, struct statfs *sbp)
  213 {
  214 
  215         sbp->f_flags = 0;
  216         sbp->f_bsize = DEV_BSIZE;
  217         sbp->f_iosize = DEV_BSIZE;
  218         sbp->f_blocks = 2;              /* 1K to keep df happy */
  219         sbp->f_bfree = 0;
  220         sbp->f_bavail = 0;
  221         sbp->f_files = 0;
  222         sbp->f_ffree = 0;
  223         return (0);
  224 }
  225 
  226 static struct vfsops devfs_vfsops = {
  227         .vfs_mount =            devfs_mount,
  228         .vfs_root =             devfs_root,
  229         .vfs_statfs =           devfs_statfs,
  230         .vfs_unmount =          devfs_unmount,
  231 };
  232 
  233 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);

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FreeBSD/Linux Kernel Cross Reference sys/fs/devfs/devfs_vfsops.c

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sys/fs/devfs/devfs_vfsops.c