d9b2d9f7a2
these filesystems will support shared locks until they are explicitly modified to do so. Careful review must be done to ensure that this is safe for each individual filesystem. Sponsored by: Isilon Systems, Inc.
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2000
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* Poul-Henning Kamp. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
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* From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
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*
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* $FreeBSD$
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*/
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#include "opt_devfs.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <fs/devfs/devfs.h>
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MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
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static vfs_mount_t devfs_mount;
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static vfs_unmount_t devfs_unmount;
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static vfs_root_t devfs_root;
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static vfs_statfs_t devfs_statfs;
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/*
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* Mount the filesystem
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*/
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static int
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devfs_mount(struct mount *mp, struct thread *td)
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{
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int error;
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struct devfs_mount *fmp;
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struct vnode *rvp;
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error = 0;
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if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
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return (EOPNOTSUPP);
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MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount),
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M_DEVFS, M_WAITOK | M_ZERO);
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MALLOC(fmp->dm_dirent, struct devfs_dirent **,
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sizeof(struct devfs_dirent *) * NDEVFSINO,
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M_DEVFS, M_WAITOK | M_ZERO);
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lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE);
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mp->mnt_flag |= MNT_LOCAL;
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#ifdef MAC
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mp->mnt_flag |= MNT_MULTILABEL;
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#endif
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fmp->dm_mount = mp;
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mp->mnt_data = (qaddr_t) fmp;
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vfs_getnewfsid(mp);
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fmp->dm_inode = DEVFSINOMOUNT;
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fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL);
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fmp->dm_rootdir->de_inode = 2;
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#ifdef MAC
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mac_create_devfs_directory(mp, "", 0, fmp->dm_rootdir);
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#endif
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fmp->dm_basedir = fmp->dm_rootdir;
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devfs_rules_newmount(fmp, td);
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error = devfs_root(mp, LK_EXCLUSIVE, &rvp, td);
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if (error) {
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lockdestroy(&fmp->dm_lock);
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FREE(fmp, M_DEVFS);
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return (error);
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}
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VOP_UNLOCK(rvp, 0, td);
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vfs_mountedfrom(mp, "devfs");
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return (0);
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}
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static int
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devfs_unmount(mp, mntflags, td)
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struct mount *mp;
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int mntflags;
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struct thread *td;
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{
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int error;
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int flags = 0;
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struct devfs_mount *fmp;
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fmp = VFSTODEVFS(mp);
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/* There is 1 extra root vnode reference from devfs_mount(). */
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error = vflush(mp, 1, flags, td);
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if (error)
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return (error);
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devfs_purge(fmp->dm_rootdir);
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mp->mnt_data = 0;
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lockdestroy(&fmp->dm_lock);
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free(fmp->dm_dirent, M_DEVFS);
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free(fmp, M_DEVFS);
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return 0;
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}
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/* Return locked reference to root. */
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static int
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devfs_root(mp, flags, vpp, td)
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struct mount *mp;
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int flags;
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struct vnode **vpp;
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struct thread *td;
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{
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int error;
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struct vnode *vp;
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struct devfs_mount *dmp;
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dmp = VFSTODEVFS(mp);
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error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td);
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if (error)
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return (error);
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vp->v_vflag |= VV_ROOT;
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*vpp = vp;
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return (0);
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}
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static int
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devfs_statfs(mp, sbp, td)
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struct mount *mp;
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struct statfs *sbp;
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struct thread *td;
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{
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sbp->f_flags = 0;
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sbp->f_bsize = DEV_BSIZE;
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sbp->f_iosize = DEV_BSIZE;
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sbp->f_blocks = 2; /* 1K to keep df happy */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = 0;
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sbp->f_ffree = 0;
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return (0);
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}
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static struct vfsops devfs_vfsops = {
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.vfs_mount = devfs_mount,
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.vfs_root = devfs_root,
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.vfs_statfs = devfs_statfs,
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.vfs_unmount = devfs_unmount,
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};
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VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
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