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devfs.h
(6.64 KB)
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devfs_devs.c
(18.15 KB)
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devfs_dir.c
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devfs_int.h
(3.15 KB)
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devfs_rule.c
(21.41 KB)
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devfs_vfsops.c
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devfs_vnops.c
(47.24 KB)
Editing: devfs_vfsops.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1992, 1993, 1995 * The Regents of the University of California. All rights reserved. * Copyright (c) 2000 * Poul-Henning Kamp. All rights reserved. * * This code is derived from software donated to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36 * * $FreeBSD$ */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/mount.h> #include <sys/proc.h> #include <sys/sx.h> #include <sys/vnode.h> #include <sys/limits.h> #include <sys/jail.h> #include <fs/devfs/devfs.h> static struct unrhdr *devfs_unr; MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); static vfs_mount_t devfs_mount; static vfs_unmount_t devfs_unmount; static vfs_root_t devfs_root; static vfs_statfs_t devfs_statfs; static const char *devfs_opts[] = { "from", "export", "ruleset", NULL }; /* * Mount the filesystem */ static int devfs_mount(struct mount *mp) { int error; struct devfs_mount *fmp; struct vnode *rvp; struct thread *td = curthread; int injail, rsnum; if (devfs_unr == NULL) devfs_unr = new_unrhdr(0, INT_MAX, NULL); error = 0; if (mp->mnt_flag & MNT_ROOTFS) return (EOPNOTSUPP); rsnum = 0; injail = jailed(td->td_ucred); if (mp->mnt_optnew != NULL) { if (vfs_filteropt(mp->mnt_optnew, devfs_opts)) return (EINVAL); if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) return (EOPNOTSUPP); if (vfs_getopt(mp->mnt_optnew, "ruleset", NULL, NULL) == 0 && (vfs_scanopt(mp->mnt_optnew, "ruleset", "%d", &rsnum) != 1 || rsnum < 0 || rsnum > 65535)) { vfs_mount_error(mp, "%s", "invalid ruleset specification"); return (EINVAL); } if (injail && rsnum != 0 && rsnum != td->td_ucred->cr_prison->pr_devfs_rsnum) return (EPERM); } /* jails enforce their ruleset */ if (injail) rsnum = td->td_ucred->cr_prison->pr_devfs_rsnum; if (mp->mnt_flag & MNT_UPDATE) { if (rsnum != 0) { fmp = mp->mnt_data; if (fmp != NULL) { sx_xlock(&fmp->dm_lock); devfs_ruleset_set((devfs_rsnum)rsnum, fmp); devfs_ruleset_apply(fmp); sx_xunlock(&fmp->dm_lock); } } return (0); } fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO); fmp->dm_idx = alloc_unr(devfs_unr); sx_init(&fmp->dm_lock, "devfsmount"); fmp->dm_holdcnt = 1; MNT_ILOCK(mp); mp->mnt_flag |= MNT_LOCAL; mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | MNTK_NOMSYNC; #ifdef MAC mp->mnt_flag |= MNT_MULTILABEL; #endif MNT_IUNLOCK(mp); fmp->dm_mount = mp; mp->mnt_data = (void *) fmp; vfs_getnewfsid(mp); fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO); error = devfs_root(mp, LK_EXCLUSIVE, &rvp); if (error) { sx_destroy(&fmp->dm_lock); free_unr(devfs_unr, fmp->dm_idx); free(fmp, M_DEVFS); return (error); } if (rsnum != 0) { sx_xlock(&fmp->dm_lock); devfs_ruleset_set((devfs_rsnum)rsnum, fmp); sx_xunlock(&fmp->dm_lock); } VOP_UNLOCK(rvp); vfs_cache_root_set(mp, rvp); vfs_mountedfrom(mp, "devfs"); return (0); } void devfs_unmount_final(struct devfs_mount *fmp) { sx_destroy(&fmp->dm_lock); free(fmp, M_DEVFS); } static int devfs_unmount(struct mount *mp, int mntflags) { int error; int flags = 0; struct devfs_mount *fmp; int hold; u_int idx; fmp = VFSTODEVFS(mp); KASSERT(fmp->dm_mount != NULL, ("devfs_unmount unmounted devfs_mount")); if (mntflags & MNT_FORCE) flags |= FORCECLOSE; /* There is 1 extra root vnode reference from devfs_mount(). */ error = vflush(mp, 1, flags, curthread); if (error) return (error); sx_xlock(&fmp->dm_lock); devfs_cleanup(fmp); devfs_rules_cleanup(fmp); fmp->dm_mount = NULL; hold = --fmp->dm_holdcnt; mp->mnt_data = NULL; idx = fmp->dm_idx; sx_xunlock(&fmp->dm_lock); free_unr(devfs_unr, idx); if (hold == 0) devfs_unmount_final(fmp); return 0; } /* Return locked reference to root. */ static int devfs_root(struct mount *mp, int flags, struct vnode **vpp) { int error; struct vnode *vp; struct devfs_mount *dmp; dmp = VFSTODEVFS(mp); sx_xlock(&dmp->dm_lock); error = devfs_allocv(dmp->dm_rootdir, mp, LK_EXCLUSIVE, &vp); if (error) return (error); vp->v_vflag |= VV_ROOT; *vpp = vp; return (0); } static int devfs_statfs(struct mount *mp, struct statfs *sbp) { sbp->f_flags = 0; sbp->f_bsize = DEV_BSIZE; sbp->f_iosize = DEV_BSIZE; sbp->f_blocks = 2; /* 1K to keep df happy */ sbp->f_bfree = 0; sbp->f_bavail = 0; sbp->f_files = 0; sbp->f_ffree = 0; return (0); } static struct vfsops devfs_vfsops = { .vfs_mount = devfs_mount, .vfs_root = vfs_cache_root, .vfs_cachedroot = devfs_root, .vfs_statfs = devfs_statfs, .vfs_unmount = devfs_unmount, }; VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC | VFCF_JAIL);
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