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  * $FreeBSD$
   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 /*
   60  * Mount the filesystem
   61  */
   62 static int
   63 devfs_mount(struct mount *mp, struct thread *td)
   64 {
   65         int error;
   66         struct devfs_mount *fmp;
   67         struct vnode *rvp;
   68 
   69         if (devfs_unr == NULL)
   70                 devfs_unr = new_unrhdr(0, INT_MAX, NULL);
   71 
   72         error = 0;
   73 
   74         if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
   75                 return (EOPNOTSUPP);
   76 
   77         fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO);
   78         fmp->dm_idx = alloc_unr(devfs_unr);
   79         sx_init(&fmp->dm_lock, "devfsmount");
   80         fmp->dm_holdcnt = 1;
   81 
   82         MNT_ILOCK(mp);
   83         mp->mnt_flag |= MNT_LOCAL;
   84         mp->mnt_kern_flag |= MNTK_MPSAFE;
   85 #ifdef MAC
   86         mp->mnt_flag |= MNT_MULTILABEL;
   87 #endif
   88         MNT_IUNLOCK(mp);
   89         fmp->dm_mount = mp;
   90         mp->mnt_data = (void *) fmp;
   91         vfs_getnewfsid(mp);
   92 
   93         fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO);
   94 
   95         error = devfs_root(mp, LK_EXCLUSIVE, &rvp, td);
   96         if (error) {
   97                 sx_destroy(&fmp->dm_lock);
   98                 free_unr(devfs_unr, fmp->dm_idx);
   99                 free(fmp, M_DEVFS);
  100                 return (error);
  101         }
  102 
  103         VOP_UNLOCK(rvp, 0, td);
  104 
  105         vfs_mountedfrom(mp, "devfs");
  106 
  107         return (0);
  108 }
  109 
  110 void
  111 devfs_unmount_final(struct devfs_mount *fmp)
  112 {
  113         sx_destroy(&fmp->dm_lock);
  114         free(fmp, M_DEVFS);
  115 }
  116 
  117 static int
  118 devfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  119 {
  120         int error;
  121         int flags = 0;
  122         struct devfs_mount *fmp;
  123         int hold;
  124         u_int idx;
  125 
  126         fmp = VFSTODEVFS(mp);
  127         KASSERT(fmp->dm_mount != NULL,
  128                 ("devfs_unmount unmounted devfs_mount"));
  129         /* There is 1 extra root vnode reference from devfs_mount(). */
  130         error = vflush(mp, 1, flags, td);
  131         if (error)
  132                 return (error);
  133         sx_xlock(&fmp->dm_lock);
  134         devfs_cleanup(fmp);
  135         devfs_rules_cleanup(fmp);
  136         fmp->dm_mount = NULL;
  137         hold = --fmp->dm_holdcnt;
  138         mp->mnt_data = NULL;
  139         idx = fmp->dm_idx;
  140         sx_xunlock(&fmp->dm_lock);
  141         free_unr(devfs_unr, idx);
  142         if (hold == 0)
  143                 devfs_unmount_final(fmp);
  144         return 0;
  145 }
  146 
  147 /* Return locked reference to root.  */
  148 
  149 static int
  150 devfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
  151 {
  152         int error;
  153         struct vnode *vp;
  154         struct devfs_mount *dmp;
  155 
  156         dmp = VFSTODEVFS(mp);
  157         sx_xlock(&dmp->dm_lock);
  158         error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td);
  159         if (error)
  160                 return (error);
  161         vp->v_vflag |= VV_ROOT;
  162         *vpp = vp;
  163         return (0);
  164 }
  165 
  166 static int
  167 devfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
  168 {
  169 
  170         sbp->f_flags = 0;
  171         sbp->f_bsize = DEV_BSIZE;
  172         sbp->f_iosize = DEV_BSIZE;
  173         sbp->f_blocks = 2;              /* 1K to keep df happy */
  174         sbp->f_bfree = 0;
  175         sbp->f_bavail = 0;
  176         sbp->f_files = 0;
  177         sbp->f_ffree = 0;
  178         return (0);
  179 }
  180 
  181 static struct vfsops devfs_vfsops = {
  182         .vfs_mount =            devfs_mount,
  183         .vfs_root =             devfs_root,
  184         .vfs_statfs =           devfs_statfs,
  185         .vfs_unmount =          devfs_unmount,
  186 };
  187 
  188 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);

Cache object: 80ddc5c3ad6bf0e958bb6cbb872ad6b5


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