247 lines
6.0 KiB
C
247 lines
6.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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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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#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/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <sys/vnode.h>
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#include <sys/limits.h>
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#include <sys/jail.h>
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#include <fs/devfs/devfs.h>
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static struct unrhdr *devfs_unr;
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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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static const char *devfs_opts[] = {
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"from", "export", "ruleset", NULL
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};
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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)
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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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struct thread *td = curthread;
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int injail, rsnum;
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if (devfs_unr == NULL)
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devfs_unr = new_unrhdr(0, INT_MAX, NULL);
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error = 0;
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if (mp->mnt_flag & MNT_ROOTFS)
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return (EOPNOTSUPP);
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rsnum = 0;
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injail = jailed(td->td_ucred);
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if (mp->mnt_optnew != NULL) {
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if (vfs_filteropt(mp->mnt_optnew, devfs_opts))
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return (EINVAL);
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if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
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return (EOPNOTSUPP);
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if (vfs_getopt(mp->mnt_optnew, "ruleset", NULL, NULL) == 0 &&
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(vfs_scanopt(mp->mnt_optnew, "ruleset", "%d",
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&rsnum) != 1 || rsnum < 0 || rsnum > 65535)) {
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vfs_mount_error(mp, "%s",
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"invalid ruleset specification");
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return (EINVAL);
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}
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if (injail && rsnum != 0 &&
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rsnum != td->td_ucred->cr_prison->pr_devfs_rsnum)
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return (EPERM);
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}
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/* jails enforce their ruleset */
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if (injail)
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rsnum = td->td_ucred->cr_prison->pr_devfs_rsnum;
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if (mp->mnt_flag & MNT_UPDATE) {
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if (rsnum != 0) {
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fmp = mp->mnt_data;
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if (fmp != NULL) {
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sx_xlock(&fmp->dm_lock);
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devfs_ruleset_set((devfs_rsnum)rsnum, fmp);
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devfs_ruleset_apply(fmp);
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sx_xunlock(&fmp->dm_lock);
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}
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}
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return (0);
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}
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fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO);
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fmp->dm_idx = alloc_unr(devfs_unr);
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sx_init(&fmp->dm_lock, "devfsmount");
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fmp->dm_holdcnt = 1;
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MNT_ILOCK(mp);
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
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MNTK_NOMSYNC;
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#ifdef MAC
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mp->mnt_flag |= MNT_MULTILABEL;
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#endif
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MNT_IUNLOCK(mp);
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fmp->dm_mount = mp;
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mp->mnt_data = (void *) fmp;
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vfs_getnewfsid(mp);
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fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO);
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error = devfs_root(mp, LK_EXCLUSIVE, &rvp);
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if (error) {
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sx_destroy(&fmp->dm_lock);
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free_unr(devfs_unr, fmp->dm_idx);
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free(fmp, M_DEVFS);
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return (error);
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}
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if (rsnum != 0) {
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sx_xlock(&fmp->dm_lock);
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devfs_ruleset_set((devfs_rsnum)rsnum, fmp);
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sx_xunlock(&fmp->dm_lock);
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}
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VOP_UNLOCK(rvp);
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vfs_cache_root_set(mp, rvp);
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vfs_mountedfrom(mp, "devfs");
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return (0);
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}
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void
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devfs_unmount_final(struct devfs_mount *fmp)
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{
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sx_destroy(&fmp->dm_lock);
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free(fmp, M_DEVFS);
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}
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static int
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devfs_unmount(struct mount *mp, int mntflags)
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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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int hold;
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u_int idx;
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fmp = VFSTODEVFS(mp);
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KASSERT(fmp->dm_mount != NULL,
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("devfs_unmount unmounted devfs_mount"));
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/* There is 1 extra root vnode reference from devfs_mount(). */
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error = vflush(mp, 1, flags, curthread);
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if (error)
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return (error);
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sx_xlock(&fmp->dm_lock);
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devfs_cleanup(fmp);
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devfs_rules_cleanup(fmp);
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fmp->dm_mount = NULL;
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hold = --fmp->dm_holdcnt;
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mp->mnt_data = NULL;
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idx = fmp->dm_idx;
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sx_xunlock(&fmp->dm_lock);
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free_unr(devfs_unr, idx);
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if (hold == 0)
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devfs_unmount_final(fmp);
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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(struct mount *mp, int flags, struct vnode **vpp)
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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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sx_xlock(&dmp->dm_lock);
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error = devfs_allocv(dmp->dm_rootdir, mp, LK_EXCLUSIVE, &vp);
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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(struct mount *mp, struct statfs *sbp)
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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 = 2;
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sbp->f_bavail = 2;
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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 = vfs_cache_root,
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.vfs_cachedroot = 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 | VFCF_JAIL);
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