The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/devfs/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/6.1/sys/fs/devfs/devfs_vfsops.c 150569 2005-09-26 14:36:54Z phk $
   35  */
   36 
   37 #include "opt_devfs.h"
   38 #include "opt_mac.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/lock.h>
   44 #include <sys/mac.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mount.h>
   47 #include <sys/proc.h>
   48 #include <sys/sx.h>
   49 #include <sys/vnode.h>
   50 #include <sys/limits.h>
   51 
   52 #include <fs/devfs/devfs.h>
   53 
   54 static struct unrhdr    *devfs_unr;
   55 
   56 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
   57 
   58 static vfs_mount_t      devfs_mount;
   59 static vfs_unmount_t    devfs_unmount;
   60 static vfs_root_t       devfs_root;
   61 static vfs_statfs_t     devfs_statfs;
   62 
   63 /*
   64  * Mount the filesystem
   65  */
   66 static int
   67 devfs_mount(struct mount *mp, struct thread *td)
   68 {
   69         int error;
   70         struct devfs_mount *fmp;
   71         struct vnode *rvp;
   72 
   73         if (devfs_unr == NULL)
   74                 devfs_unr = new_unrhdr(0, INT_MAX, NULL);
   75 
   76         error = 0;
   77 
   78         if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
   79                 return (EOPNOTSUPP);
   80 
   81         fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO);
   82         fmp->dm_idx = alloc_unr(devfs_unr);
   83         sx_init(&fmp->dm_lock, "devfsmount");
   84 
   85         mp->mnt_flag |= MNT_LOCAL;
   86         mp->mnt_kern_flag |= MNTK_MPSAFE;
   87 #ifdef MAC
   88         mp->mnt_flag |= MNT_MULTILABEL;
   89 #endif
   90         fmp->dm_mount = mp;
   91         mp->mnt_data = (void *) fmp;
   92         vfs_getnewfsid(mp);
   93 
   94         fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO);
   95 
   96         error = devfs_root(mp, LK_EXCLUSIVE, &rvp, td);
   97         if (error) {
   98                 sx_destroy(&fmp->dm_lock);
   99                 free_unr(devfs_unr, fmp->dm_idx);
  100                 free(fmp, M_DEVFS);
  101                 return (error);
  102         }
  103 
  104         VOP_UNLOCK(rvp, 0, td);
  105 
  106         vfs_mountedfrom(mp, "devfs");
  107 
  108         return (0);
  109 }
  110 
  111 static int
  112 devfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  113 {
  114         int error;
  115         int flags = 0;
  116         struct devfs_mount *fmp;
  117 
  118         fmp = VFSTODEVFS(mp);
  119         /* There is 1 extra root vnode reference from devfs_mount(). */
  120         error = vflush(mp, 1, flags, td);
  121         if (error)
  122                 return (error);
  123         sx_xlock(&fmp->dm_lock);
  124         devfs_cleanup(fmp);
  125         devfs_rules_cleanup(fmp);
  126         sx_xunlock(&fmp->dm_lock);
  127         mp->mnt_data = NULL;
  128         sx_destroy(&fmp->dm_lock);
  129         free_unr(devfs_unr, fmp->dm_idx);
  130         free(fmp, M_DEVFS);
  131         return 0;
  132 }
  133 
  134 /* Return locked reference to root.  */
  135 
  136 static int
  137 devfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
  138 {
  139         int error;
  140         struct vnode *vp;
  141         struct devfs_mount *dmp;
  142 
  143         dmp = VFSTODEVFS(mp);
  144         error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td);
  145         if (error)
  146                 return (error);
  147         vp->v_vflag |= VV_ROOT;
  148         *vpp = vp;
  149         return (0);
  150 }
  151 
  152 static int
  153 devfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
  154 {
  155 
  156         sbp->f_flags = 0;
  157         sbp->f_bsize = DEV_BSIZE;
  158         sbp->f_iosize = DEV_BSIZE;
  159         sbp->f_blocks = 2;              /* 1K to keep df happy */
  160         sbp->f_bfree = 0;
  161         sbp->f_bavail = 0;
  162         sbp->f_files = 0;
  163         sbp->f_ffree = 0;
  164         return (0);
  165 }
  166 
  167 static struct vfsops devfs_vfsops = {
  168         .vfs_mount =            devfs_mount,
  169         .vfs_root =             devfs_root,
  170         .vfs_statfs =           devfs_statfs,
  171         .vfs_unmount =          devfs_unmount,
  172 };
  173 
  174 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);

Cache object: a60e98697145a85a504ed9bebb2ec536


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