/* * Copyright (c) 2000-2010 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /*- * Copyright 1997,1998 Julian Elischer. All rights reserved. * julian@freebsd.org * * 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. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``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 HOLDER 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. * * devfs_vfsops.c * */ /* * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce * support for mandatory and extensible security protections. This notice * is included in support of clause 2.2 (b) of the Apple Public License, * Version 2.0. */ /* * HISTORY * Dieter Siegmund (dieter@apple.com) Wed Jul 14 13:37:59 PDT 1999 * - modified devfs_statfs() to use devfs_stats to calculate the * amount of memory used by devfs */ #include #include #include #include #include #include #include #include #include #if CONFIG_MACF #include #endif #include "devfs.h" #include "devfsdefs.h" #if FDESC #include "fdesc.h" #endif /* FDESC */ static int devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, vfs_context_t ctx); static int devfs_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t ctx); #if !defined(SECURE_KERNEL) extern int setup_kmem; __private_extern__ void devfs_setup_kmem(void); #endif /*- * Called from the generic VFS startups. * This is the second stage of DEVFS initialisation. * The probed devices have already been loaded and the * basic structure of the DEVFS created. * We take the oportunity to mount the hidden DEVFS layer, so that * devices from devfs get sync'd. */ static int devfs_init(__unused struct vfsconf *vfsp) { if (devfs_sinit()) return (ENOTSUP); devfs_make_node(makedev(0, 0), DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0622, "console"); devfs_make_node(makedev(2, 0), DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666, "tty"); #if !defined(SECURE_KERNEL) if (setup_kmem) { devfs_setup_kmem(); } #endif devfs_make_node(makedev(3, 2), DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666, "null"); devfs_make_node(makedev(3, 3), DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666, "zero"); devfs_make_node(makedev(6, 0), DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0600, "klog"); #if FDESC devfs_fdesc_init(); #endif return 0; } #if !defined(SECURE_KERNEL) __private_extern__ void devfs_setup_kmem(void) { devfs_make_node(makedev(3, 0), DEVFS_CHAR, UID_ROOT, GID_KMEM, 0640, "mem"); devfs_make_node(makedev(3, 1), DEVFS_CHAR, UID_ROOT, GID_KMEM, 0640, "kmem"); } #endif /*- * mp - pointer to 'mount' structure * path - addr in user space of mount point (ie /usr or whatever) * data - addr in user space of mount params including the * name of the block special file to treat as a filesystem. * (NOT USED) * ndp - namei data pointer (NOT USED) * p - proc pointer * devfs is special in that it doesn't require any device to be mounted.. * It makes up its data as it goes along. * it must be mounted during single user.. until it is, only std{in/out/err} * and the root filesystem are available. */ /*proto*/ int devfs_mount(struct mount *mp, __unused vnode_t devvp, __unused user_addr_t data, vfs_context_t ctx) { struct devfsmount *devfs_mp_p; /* devfs specific mount info */ int error; /*- * If they just want to update, we don't need to do anything. */ if (mp->mnt_flag & MNT_UPDATE) { return 0; } /* Advisory locking should be handled at the VFS layer */ vfs_setlocklocal(mp); /*- * Well, it's not an update, it's a real mount request. * Time to get dirty. * HERE we should check to see if we are already mounted here. */ MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount), M_DEVFSMNT, M_WAITOK); if (devfs_mp_p == NULL) return (ENOMEM); bzero(devfs_mp_p,sizeof(*devfs_mp_p)); devfs_mp_p->mount = mp; /*- * Fill out some fields */ mp->mnt_data = (qaddr_t)devfs_mp_p; mp->mnt_vfsstat.f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p; mp->mnt_vfsstat.f_fsid.val[1] = vfs_typenum(mp); mp->mnt_flag |= MNT_LOCAL; DEVFS_LOCK(); error = dev_dup_plane(devfs_mp_p); DEVFS_UNLOCK(); if (error) { mp->mnt_data = (qaddr_t)0; FREE((caddr_t)devfs_mp_p, M_DEVFSMNT); return (error); } else DEVFS_INCR_MOUNTS(); /*- * Copy in the name of the directory the filesystem * is to be mounted on. * And we clear the remainder of the character strings * to be tidy. */ bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN); bcopy("devfs",mp->mnt_vfsstat.f_mntfromname, 5); (void)devfs_statfs(mp, &mp->mnt_vfsstat, ctx); return 0; } static int devfs_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t ctx) { return 0; } /*- * Unmount the filesystem described by mp. */ static int devfs_unmount( struct mount *mp, int mntflags, __unused vfs_context_t ctx) { struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data; int flags = 0; int force = 0; int error; if (mntflags & MNT_FORCE) { flags |= FORCECLOSE; force = 1; } error = vflush(mp, NULLVP, flags); if (error && !force) return error; DEVFS_LOCK(); devfs_free_plane(devfs_mp_p); DEVFS_UNLOCK(); DEVFS_DECR_MOUNTS(); FREE((caddr_t)devfs_mp_p, M_DEVFSMNT); mp->mnt_data = (qaddr_t)0; mp->mnt_flag &= ~MNT_LOCAL; return 0; } /* return the address of the root vnode in *vpp */ static int devfs_root(struct mount *mp, struct vnode **vpp, __unused vfs_context_t ctx) { struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data); int error; DEVFS_LOCK(); /* last parameter to devfs_dntovn() is ignored */ error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp, vpp, NULL); DEVFS_UNLOCK(); return error; } static int devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, __unused vfs_context_t ctx) { struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data; /*- * Fill in the stat block. */ //sbp->f_type = mp->mnt_vfsstat.f_type; sbp->f_flags = 0; /* XXX */ sbp->f_bsize = 512; sbp->f_iosize = 512; sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount) + devfs_stats.nodes * sizeof(devnode_t) + devfs_stats.entries * sizeof(devdirent_t) + devfs_stats.stringspace ) / sbp->f_bsize; sbp->f_bfree = 0; sbp->f_bavail = 0; sbp->f_files = devfs_stats.nodes; sbp->f_ffree = 0; sbp->f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p; sbp->f_fsid.val[1] = vfs_typenum(mp); return 0; } static int devfs_vfs_getattr(__unused mount_t mp, struct vfs_attr *fsap, __unused vfs_context_t ctx) { VFSATTR_RETURN(fsap, f_objcount, devfs_stats.nodes); VFSATTR_RETURN(fsap, f_maxobjcount, devfs_stats.nodes); VFSATTR_RETURN(fsap, f_bsize, 512); VFSATTR_RETURN(fsap, f_iosize, 512); if (VFSATTR_IS_ACTIVE(fsap, f_blocks) || VFSATTR_IS_ACTIVE(fsap, f_bused)) { fsap->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount) + devfs_stats.nodes * sizeof(devnode_t) + devfs_stats.entries * sizeof(devdirent_t) + devfs_stats.stringspace ) / fsap->f_bsize; fsap->f_bused = fsap->f_blocks; VFSATTR_SET_SUPPORTED(fsap, f_blocks); VFSATTR_SET_SUPPORTED(fsap, f_bused); } VFSATTR_RETURN(fsap, f_bfree, 0); VFSATTR_RETURN(fsap, f_bavail, 0); VFSATTR_RETURN(fsap, f_files, devfs_stats.nodes); VFSATTR_RETURN(fsap, f_ffree, 0); VFSATTR_RETURN(fsap, f_fssubtype, 0); if (VFSATTR_IS_ACTIVE(fsap, f_capabilities)) { fsap->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] = VOL_CAP_FMT_SYMBOLICLINKS | VOL_CAP_FMT_HARDLINKS | VOL_CAP_FMT_NO_ROOT_TIMES | VOL_CAP_FMT_CASE_SENSITIVE | VOL_CAP_FMT_CASE_PRESERVING | VOL_CAP_FMT_FAST_STATFS | VOL_CAP_FMT_2TB_FILESIZE | VOL_CAP_FMT_HIDDEN_FILES; fsap->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] = VOL_CAP_INT_ATTRLIST ; fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0; fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0; fsap->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] = VOL_CAP_FMT_PERSISTENTOBJECTIDS | VOL_CAP_FMT_SYMBOLICLINKS | VOL_CAP_FMT_HARDLINKS | VOL_CAP_FMT_JOURNAL | VOL_CAP_FMT_JOURNAL_ACTIVE | VOL_CAP_FMT_NO_ROOT_TIMES | VOL_CAP_FMT_SPARSE_FILES | VOL_CAP_FMT_ZERO_RUNS | VOL_CAP_FMT_CASE_SENSITIVE | VOL_CAP_FMT_CASE_PRESERVING | VOL_CAP_FMT_FAST_STATFS | VOL_CAP_FMT_2TB_FILESIZE | VOL_CAP_FMT_OPENDENYMODES | VOL_CAP_FMT_HIDDEN_FILES | VOL_CAP_FMT_PATH_FROM_ID | VOL_CAP_FMT_NO_VOLUME_SIZES; fsap->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] = VOL_CAP_INT_SEARCHFS | VOL_CAP_INT_ATTRLIST | VOL_CAP_INT_NFSEXPORT | VOL_CAP_INT_READDIRATTR | VOL_CAP_INT_EXCHANGEDATA | VOL_CAP_INT_COPYFILE | VOL_CAP_INT_ALLOCATE | VOL_CAP_INT_VOL_RENAME | VOL_CAP_INT_ADVLOCK | VOL_CAP_INT_FLOCK | VOL_CAP_INT_EXTENDED_SECURITY | VOL_CAP_INT_USERACCESS | VOL_CAP_INT_MANLOCK | VOL_CAP_INT_EXTENDED_ATTR | VOL_CAP_INT_NAMEDSTREAMS; fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0; fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0; VFSATTR_SET_SUPPORTED(fsap, f_capabilities); } if (VFSATTR_IS_ACTIVE(fsap, f_attributes)) { fsap->f_attributes.validattr.commonattr = ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID | ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID | ATTR_CMN_PAROBJID | ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME | ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK | ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID; fsap->f_attributes.validattr.volattr = ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE | ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION | ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT | ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS | ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES | ATTR_VOL_ATTRIBUTES; fsap->f_attributes.validattr.dirattr = ATTR_DIR_LINKCOUNT | ATTR_DIR_MOUNTSTATUS; fsap->f_attributes.validattr.fileattr = ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE | ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE | ATTR_FILE_DATALENGTH; fsap->f_attributes.validattr.forkattr = 0; fsap->f_attributes.nativeattr.commonattr = ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID | ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID | ATTR_CMN_PAROBJID | ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME | ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK | ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID; fsap->f_attributes.nativeattr.volattr = ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE | ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION | ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT | ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS | ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES | ATTR_VOL_ATTRIBUTES; fsap->f_attributes.nativeattr.dirattr = ATTR_DIR_MOUNTSTATUS; fsap->f_attributes.nativeattr.fileattr = ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE | ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE | ATTR_FILE_DATALENGTH; fsap->f_attributes.nativeattr.forkattr = 0; VFSATTR_SET_SUPPORTED(fsap, f_attributes); } return 0; } static int devfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx) { return (0); } static int devfs_vget(__unused struct mount *mp, __unused ino64_t ino, __unused struct vnode **vpp, __unused vfs_context_t ctx) { return ENOTSUP; } /************************************************************* * The concept of exporting a kernel generated devfs is stupid * So don't handle filehandles */ static int devfs_fhtovp (__unused struct mount *mp, __unused int fhlen, __unused unsigned char *fhp, __unused struct vnode **vpp, __unused vfs_context_t ctx) { return (EINVAL); } static int devfs_vptofh (__unused struct vnode *vp, __unused int *fhlenp, __unused unsigned char *fhp, __unused vfs_context_t ctx) { return (EINVAL); } static int devfs_sysctl(__unused int *name, __unused u_int namelen, __unused user_addr_t oldp, __unused size_t *oldlenp, __unused user_addr_t newp, __unused size_t newlen, __unused vfs_context_t ctx) { return (ENOTSUP); } #include /* * Function: devfs_kernel_mount * Purpose: * Mount devfs at the given mount point from within the kernel. */ int devfs_kernel_mount(char * mntname) { struct mount *mp; int error; struct nameidata nd; struct vnode * vp; vfs_context_t ctx = vfs_context_kernel(); struct vfstable *vfsp; /* Find our vfstable entry */ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) if (!strncmp(vfsp->vfc_name, "devfs", sizeof(vfsp->vfc_name))) break; if (!vfsp) { panic("Could not find entry in vfsconf for devfs.\n"); } /* * Get vnode to be covered */ NDINIT(&nd, LOOKUP, OP_MOUNT, FOLLOW | LOCKLEAF, UIO_SYSSPACE, CAST_USER_ADDR_T(mntname), ctx); if ((error = namei(&nd))) { printf("devfs_kernel_mount: failed to find directory '%s', %d\n", mntname, error); return (error); } nameidone(&nd); vp = nd.ni_vp; if ((error = VNOP_FSYNC(vp, MNT_WAIT, ctx))) { printf("devfs_kernel_mount: vnop_fsync failed: %d\n", error); vnode_put(vp); return (error); } if ((error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0))) { printf("devfs_kernel_mount: buf_invalidateblks failed: %d\n", error); vnode_put(vp); return (error); } if (vnode_isdir(vp) == 0) { printf("devfs_kernel_mount: '%s' is not a directory\n", mntname); vnode_put(vp); return (ENOTDIR); } if ((vnode_mountedhere(vp))) { vnode_put(vp); return (EBUSY); } /* * Allocate and initialize the filesystem. */ MALLOC_ZONE(mp, struct mount *, sizeof(struct mount), M_MOUNT, M_WAITOK); bzero((char *)mp, sizeof(struct mount)); /* Initialize the default IO constraints */ mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS; mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32; mp->mnt_ioflags = 0; mp->mnt_realrootvp = NULLVP; mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL; mount_lock_init(mp); TAILQ_INIT(&mp->mnt_vnodelist); TAILQ_INIT(&mp->mnt_workerqueue); TAILQ_INIT(&mp->mnt_newvnodes); (void)vfs_busy(mp, LK_NOWAIT); mp->mnt_op = &devfs_vfsops; mp->mnt_vtable = vfsp; mp->mnt_flag = 0; mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; strlcpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN); vp->v_mountedhere = mp; mp->mnt_vnodecovered = vp; mp->mnt_vfsstat.f_owner = kauth_cred_getuid(kauth_cred_get()); (void) copystr(mntname, mp->mnt_vfsstat.f_mntonname, MAXPATHLEN - 1, 0); #if CONFIG_MACF mac_mount_label_init(mp); mac_mount_label_associate(ctx, mp); #endif error = devfs_mount(mp, NULL, USER_ADDR_NULL, ctx); if (error) { printf("devfs_kernel_mount: mount %s failed: %d\n", mntname, error); mp->mnt_vtable->vfc_refcount--; vfs_unbusy(mp); mount_lock_destroy(mp); #if CONFIG_MACF mac_mount_label_destroy(mp); #endif FREE_ZONE(mp, sizeof (struct mount), M_MOUNT); vnode_put(vp); return (error); } vnode_ref(vp); vnode_put(vp); vfs_unbusy(mp); mount_list_add(mp); return (0); } struct vfsops devfs_vfsops = { devfs_mount, devfs_start, devfs_unmount, devfs_root, NULL, /* quotactl */ devfs_vfs_getattr, devfs_sync, devfs_vget, devfs_fhtovp, devfs_vptofh, devfs_init, devfs_sysctl, NULL, {NULL} };