X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/060df5ea7c632b1ac8cc8aac1fb59758165c2084..6d2010ae8f7a6078e10b361c6962983bab233e0f:/bsd/miscfs/union/union_vfsops.c?ds=sidebyside diff --git a/bsd/miscfs/union/union_vfsops.c b/bsd/miscfs/union/union_vfsops.c deleted file mode 100644 index 6924e2f67..000000000 --- a/bsd/miscfs/union/union_vfsops.c +++ /dev/null @@ -1,563 +0,0 @@ -/* - * Copyright (c) 2000-2006 Apple Computer, 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 (c) 1995 NeXT Computer, Inc. All Rights Reserved */ -/* - * Copyright (c) 1994, 1995 The Regents of the University of California. - * Copyright (c) 1994, 1995 Jan-Simon Pendry. - * 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. 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. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. 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. - * - * @(#)union_vfsops.c 8.20 (Berkeley) 5/20/95 - */ - -/* - * Union Layer - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -static int union_itercallback(vnode_t, void *); -static int union_root(mount_t, vnode_t *, vfs_context_t); - -/* - * Mount union filesystem - */ -static int -union_mount(mount_t mp, __unused vnode_t devvp, user_addr_t data, vfs_context_t context) -{ - proc_t p = vfs_context_proc(context); - int error = 0; - struct user_union_args args; - struct vnode *lowerrootvp = NULLVP; - struct vnode *upperrootvp = NULLVP; - struct union_mount *um = NULL; - kauth_cred_t cred = NOCRED; - const char *cp = NULL; - char *vcp; - int len; - u_int size; - struct nameidata nd; - -#ifdef UNION_DIAGNOSTIC - printf("union_mount(mp = %x)\n", mp); -#endif - - /* - * Update is a no-op - */ - if (mp->mnt_flag & MNT_UPDATE) { - /* - * Need to provide. - * 1. a way to convert between rdonly and rdwr mounts. - * 2. support for nfs exports. - */ - error = ENOTSUP; - goto bad; - } - - /* - * Get argument - */ - if (vfs_context_is64bit(context)) { - error = copyin(data, (caddr_t)&args, sizeof(args)); - } - else { - struct union_args temp; - error = copyin(data, (caddr_t)&temp, sizeof (temp)); - args.target = CAST_USER_ADDR_T(temp.target); - args.mntflags = temp.mntflags; - } - if (error) - goto bad; - - lowerrootvp = mp->mnt_vnodecovered; - vnode_get(lowerrootvp); - - /* - * Find upper node. - */ - NDINIT(&nd, LOOKUP, FOLLOW|WANTPARENT, - (IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32), - args.target, context); - - if ((error = namei(&nd))) - goto bad; - - nameidone(&nd); - upperrootvp = nd.ni_vp; - vnode_put(nd.ni_dvp); - nd.ni_dvp = NULL; - - if (upperrootvp->v_type != VDIR) { - error = EINVAL; - goto bad; - } - - MALLOC(um, struct union_mount *, sizeof(struct union_mount), - M_UFSMNT, M_WAITOK); - - /* - * Keep a held reference to the target vnodes. - * They are vnode_put'd in union_unmount. - * - * Depending on the _BELOW flag, the filesystems are - * viewed in a different order. In effect, this is the - * same as providing a mount under option to the mount syscall. - */ - - um->um_op = args.mntflags & UNMNT_OPMASK; - switch (um->um_op) { - case UNMNT_ABOVE: - um->um_lowervp = lowerrootvp; - um->um_uppervp = upperrootvp; - break; - - case UNMNT_BELOW: - um->um_lowervp = upperrootvp; - um->um_uppervp = lowerrootvp; - break; - - case UNMNT_REPLACE: - vnode_put(lowerrootvp); - lowerrootvp = NULLVP; - um->um_uppervp = upperrootvp; - um->um_lowervp = lowerrootvp; - break; - -#ifdef FAULTFS - case UNMNT_FAULTIN: - um->um_lowervp = upperrootvp; - um->um_uppervp = lowerrootvp; - break; -#endif - - default: - error = EINVAL; - goto bad; - } - - if (um->um_lowervp != NULLVP) - um->um_lowervid = vnode_vid(um->um_lowervp); - if (um->um_uppervp != NULLVP) - um->um_uppervid = vnode_vid(um->um_uppervp); - /* - * Unless the mount is readonly, ensure that the top layer - * supports whiteout operations - */ -#ifdef FAULTFS - if ((um->um_op != UNMNT_FAULTIN) && (mp->mnt_flag & MNT_RDONLY) == 0) -#else - if ((mp->mnt_flag & MNT_RDONLY) == 0) -#endif - { - error = VNOP_WHITEOUT(um->um_uppervp, (struct componentname *) 0, - LOOKUP, context); - if (error) - goto bad; - } - - um->um_cred = kauth_cred_get_with_ref(); - um->um_cmode = UN_DIRMODE &~ p->p_fd->fd_cmask; - - /* - * Depending on what you think the MNT_LOCAL flag might mean, - * you may want the && to be || on the conditional below. - * At the moment it has been defined that the filesystem is - * only local if it is all local, ie the MNT_LOCAL flag implies - * that the entire namespace is local. If you think the MNT_LOCAL - * flag implies that some of the files might be stored locally - * then you will want to change the conditional. - */ - if (um->um_op == UNMNT_ABOVE) { - if (((um->um_lowervp == NULLVP) || - (um->um_lowervp->v_mount->mnt_flag & MNT_LOCAL)) && - (um->um_uppervp->v_mount->mnt_flag & MNT_LOCAL)) - mp->mnt_flag |= MNT_LOCAL; - } - - /* - * Copy in the upper layer's RDONLY flag. This is for the benefit - * of lookup() which explicitly checks the flag, rather than asking - * the filesystem for it's own opinion. This means, that an update - * mount of the underlying filesystem to go from rdonly to rdwr - * will leave the unioned view as read-only. - */ - mp->mnt_flag |= (um->um_uppervp->v_mount->mnt_flag & MNT_RDONLY); - - mp->mnt_data = (qaddr_t) um; - vfs_getnewfsid(mp); - - - switch (um->um_op) { - case UNMNT_ABOVE: - cp = ":"; - break; - case UNMNT_BELOW: - cp = ":"; - break; - case UNMNT_REPLACE: - cp = ""; - break; -#ifdef FAULTFS - case UNMNT_FAULTIN: - cp = "/FaultingFS/"; - break; -#endif - } - len = strlen(cp); - bcopy(cp, mp->mnt_vfsstat.f_mntfromname, len); - - vcp = mp->mnt_vfsstat.f_mntfromname + len; - len = MNAMELEN - len; - - (void) copyinstr(args.target, vcp, len - 1, (size_t *)&size); - bzero(vcp + size, len - size); - -#ifdef UNION_DIAGNOSTIC - printf("union_mount: from %s, on %s\n", - mp->mnt_vfsstat.f_mntfromname, mp->mnt_vfsstat.f_mntonname); -#endif - return (0); - -bad: - if (um) - _FREE(um, M_UFSMNT); - if (IS_VALID_CRED(cred)) - kauth_cred_unref(&cred); - if (upperrootvp) - vnode_put(upperrootvp); - if (lowerrootvp) - vnode_put(lowerrootvp); - return (error); -} - -/* - * VFS start. Nothing needed here - the start routine - * on the underlying filesystem(s) will have been called - * when that filesystem was mounted. - */ -static int -union_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t context) -{ - - return (0); -} - -static int -union_itercallback(__unused vnode_t vp, void *args) -{ - int num = *(int *)args; - - *(int *)args = num + 1; - return(VNODE_RETURNED); -} - - - -/* - * Free reference to union layer - */ -static int -union_unmount(mount_t mp, int mntflags, vfs_context_t context) -{ - struct union_mount *um = MOUNTTOUNIONMOUNT(mp); - struct vnode *um_rootvp; - int error; - int freeing; - int flags = 0; - -#ifdef UNION_DIAGNOSTIC - printf("union_unmount(mp = %x)\n", mp); -#endif - - if (mntflags & MNT_FORCE) - flags |= FORCECLOSE; - - if ((error = union_root(mp, &um_rootvp, context))) - return (error); - - /* - * Keep flushing vnodes from the mount list. - * This is needed because of the un_pvp held - * reference to the parent vnode. - * If more vnodes have been freed on a given pass, - * the try again. The loop will iterate at most - * (d) times, where (d) is the maximum tree depth - * in the filesystem. - */ - for (freeing = 0; vflush(mp, um_rootvp, flags) != 0;) { - int n = 0; - - vnode_iterate(mp, VNODE_NOLOCK_INTERNAL, union_itercallback, &n); - - /* if this is unchanged then stop */ - if (n == freeing) - break; - - /* otherwise try once more time */ - freeing = n; - } - - /* At this point the root vnode should have a single reference */ - if (vnode_isinuse(um_rootvp, 0)) { - vnode_put(um_rootvp); - return (EBUSY); - } - -#ifdef UNION_DIAGNOSTIC - vprint("union root", um_rootvp); -#endif - /* - * Discard references to upper and lower target vnodes. - */ - if (um->um_lowervp) - vnode_put(um->um_lowervp); - vnode_put(um->um_uppervp); - if (IS_VALID_CRED(um->um_cred)) { - kauth_cred_unref(&um->um_cred); - } - /* - * Release reference on underlying root vnode - */ - vnode_put(um_rootvp); - /* - * And blow it away for future re-use - */ - vnode_reclaim(um_rootvp); - /* - * Finally, throw away the union_mount structure - */ - _FREE(mp->mnt_data, M_UFSMNT); /* XXX */ - mp->mnt_data = NULL; - return (0); -} - -static int -union_root(mount_t mp, vnode_t *vpp, __unused vfs_context_t context) -{ - struct union_mount *um = MOUNTTOUNIONMOUNT(mp); - int error; - - /* - * Return locked reference to root. - */ - vnode_get(um->um_uppervp); - if (um->um_lowervp) - vnode_get(um->um_lowervp); - - union_lock(); - error = union_allocvp(vpp, mp, - (struct vnode *) 0, - (struct vnode *) 0, - (struct componentname *) 0, - um->um_uppervp, - um->um_lowervp, - 1); - union_unlock(); - - if (error) { - vnode_put(um->um_uppervp); - if (um->um_lowervp) - vnode_put(um->um_lowervp); - } - - return (error); -} - -static int -union_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t context) -{ - int error; - struct union_mount *um = MOUNTTOUNIONMOUNT(mp); - struct vfs_attr attr; - uint32_t lbsize = 0; - -#ifdef UNION_DIAGNOSTIC - printf("union_vfs_getattr(mp = %x, lvp = %x, uvp = %x)\n", mp, - um->um_lowervp, - um->um_uppervp); -#endif - - /* Get values from lower file system (if any) */ - if (um->um_lowervp) { - VFSATTR_INIT(&attr); - VFSATTR_WANTED(&attr, f_bsize); - VFSATTR_WANTED(&attr, f_blocks); - VFSATTR_WANTED(&attr, f_bused); - VFSATTR_WANTED(&attr, f_files); - error = vfs_getattr(um->um_lowervp->v_mount, &attr, context); - if (error) - return (error); - - /* now copy across the "interesting" information and fake the rest */ - if (VFSATTR_IS_SUPPORTED(&attr, f_bsize)) - lbsize = attr.f_bsize; - else - lbsize = um->um_lowervp->v_mount->mnt_devblocksize; - fsap->f_blocks = VFSATTR_IS_SUPPORTED(&attr, f_blocks) ? attr.f_blocks : 0; - fsap->f_bused = VFSATTR_IS_SUPPORTED(&attr, f_bused) ? attr.f_bused : 0; - fsap->f_files = VFSATTR_IS_SUPPORTED(&attr, f_files) ? attr.f_files : 0; - } else { - fsap->f_blocks = 0; - fsap->f_bused = 0; - fsap->f_files = 0; - } - - VFSATTR_INIT(&attr); - VFSATTR_WANTED(&attr, f_bsize); - VFSATTR_WANTED(&attr, f_blocks); - VFSATTR_WANTED(&attr, f_bfree); - VFSATTR_WANTED(&attr, f_bavail); - VFSATTR_WANTED(&attr, f_files); - VFSATTR_WANTED(&attr, f_ffree); - error = vfs_getattr(um->um_uppervp->v_mount, &attr, context); - if (error) - return (error); - - if (VFSATTR_IS_SUPPORTED(&attr, f_bsize)) { - fsap->f_bsize = attr.f_bsize; - VFSATTR_SET_SUPPORTED(fsap, f_bsize); - } - if (VFSATTR_IS_SUPPORTED(&attr, f_iosize)) { - fsap->f_iosize = attr.f_iosize; - VFSATTR_SET_SUPPORTED(fsap, f_iosize); - } - - /* - * if the lower and upper blocksizes differ, then frig the - * block counts so that the sizes reported by df make some - * kind of sense. none of this makes sense though. - */ - if (VFSATTR_IS_SUPPORTED(&attr, f_bsize)) - fsap->f_bsize = attr.f_bsize; - else - fsap->f_bsize = um->um_uppervp->v_mount->mnt_devblocksize; - VFSATTR_RETURN(fsap, f_bsize, attr.f_bsize); - if (fsap->f_bsize != lbsize) - fsap->f_blocks = fsap->f_blocks * lbsize / attr.f_bsize; - - /* - * The "total" fields count total resources in all layers, - * the "free" fields count only those resources which are - * free in the upper layer (since only the upper layer - * is writeable). - */ - if (VFSATTR_IS_SUPPORTED(&attr, f_blocks)) - fsap->f_blocks += attr.f_blocks; - if (VFSATTR_IS_SUPPORTED(&attr, f_bfree)) - fsap->f_bfree = attr.f_bfree; - if (VFSATTR_IS_SUPPORTED(&attr, f_bavail)) - fsap->f_bavail = attr.f_bavail; - if (VFSATTR_IS_SUPPORTED(&attr, f_bused)) - fsap->f_bused += attr.f_bused; - if (VFSATTR_IS_SUPPORTED(&attr, f_files)) - fsap->f_files += attr.f_files; - if (VFSATTR_IS_SUPPORTED(&attr, f_ffree)) - fsap->f_ffree = attr.f_ffree; - - VFSATTR_SET_SUPPORTED(fsap, f_bsize); - VFSATTR_SET_SUPPORTED(fsap, f_blocks); - VFSATTR_SET_SUPPORTED(fsap, f_bfree); - VFSATTR_SET_SUPPORTED(fsap, f_bavail); - VFSATTR_SET_SUPPORTED(fsap, f_bused); - VFSATTR_SET_SUPPORTED(fsap, f_files); - VFSATTR_SET_SUPPORTED(fsap, f_ffree); - - return (0); -} - -/* - * XXX - Assumes no data cached at union layer. - */ -#define union_sync (int (*) (mount_t, int, vfs_context_t))nullop - -#define union_fhtovp (int (*) (mount_t, int, unsigned char *, vnode_t *, vfs_context_t))eopnotsupp -#define union_sysctl (int (*) (int *, u_int, user_addr_t, size_t *, user_addr_t, size_t, vfs_context_t))eopnotsupp -#define union_vget (int (*) (mount_t, ino64_t, vnode_t *, vfs_context_t))eopnotsupp -#define union_vptofh (int (*) (vnode_t, int *, unsigned char *, vfs_context_t))eopnotsupp - -struct vfsops union_vfsops = { - union_mount, - union_start, - union_unmount, - union_root, - NULL, /* quotactl */ - union_vfs_getattr, - union_sync, - union_vget, - union_fhtovp, - union_vptofh, - union_init, - union_sysctl, - NULL, - {NULL} -}; - -