--- /dev/null
+/*
+ * Copyright (c) 2019 Apple Inc. All rights reserved.
+ *
+ * @APPLE_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. 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_LICENSE_HEADER_END@
+ */
+
+/*-
+ * Portions Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * John Heidemann of the UCLA Ficus project.
+ *
+ * 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.
+ * 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.
+ *
+ * @(#)null_vnops.c 8.6 (Berkeley) 5/27/95
+ *
+ * Ancestors:
+ * @(#)lofs_vnops.c 1.2 (Berkeley) 6/18/92
+ * ...and...
+ * @(#)null_vnodeops.c 1.20 92/07/07 UCLA Ficus project
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mount.h>
+#include <sys/mount_internal.h>
+#include <sys/namei.h>
+#include <sys/sysctl.h>
+#include <sys/vnode.h>
+#include <sys/vnode_internal.h>
+#include <sys/xattr.h>
+#include <sys/ubc.h>
+#include <sys/types.h>
+#include <sys/dirent.h>
+
+#include "bindfs.h"
+
+#define BIND_ROOT_INO 2
+
+vop_t * bindfs_vnodeop_p = NULL;
+
+static int
+bindfs_default(__unused struct vnop_generic_args * args)
+{
+ return ENOTSUP;
+}
+
+static int
+bindfs_getattr(struct vnop_getattr_args * args)
+{
+ int error;
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+
+ struct vnode * lowervp = BINDVPTOLOWERVP(args->a_vp);
+
+ error = vnode_getwithref(lowervp);
+ if (error == 0) {
+ error = VNOP_GETATTR(lowervp, args->a_vap, args->a_context);
+ vnode_put(lowervp);
+
+ if (error == 0) {
+ if (VATTR_IS_ACTIVE(args->a_vap, va_fsid)) {
+ /* fix up fsid so it doesn't say the underlying fs*/
+ VATTR_RETURN(args->a_vap, va_fsid, vfs_statfs(vnode_mount(args->a_vp))->f_fsid.val[0]);
+ }
+ if (VATTR_IS_ACTIVE(args->a_vap, va_fsid64)) {
+ /* fix up fsid so it doesn't say the underlying fs*/
+ VATTR_RETURN(args->a_vap, va_fsid64, vfs_statfs(vnode_mount(args->a_vp))->f_fsid);
+ }
+ struct vnode * parent = vnode_parent(args->a_vp);
+ if (vnode_isvroot(args->a_vp)) {
+ // We can use the lower answers for most questions about the root vnode but need to fix up a few things
+ if (VATTR_IS_ACTIVE(args->a_vap, va_fileid)) {
+ VATTR_RETURN(args->a_vap, va_fileid, BIND_ROOT_INO);
+ }
+ if (VATTR_IS_ACTIVE(args->a_vap, va_linkid)) {
+ VATTR_RETURN(args->a_vap, va_linkid, BIND_ROOT_INO);
+ }
+ if (VATTR_IS_ACTIVE(args->a_vap, va_parentid)) {
+ // The parent of the root is itself
+ VATTR_RETURN(args->a_vap, va_parentid, BIND_ROOT_INO);
+ }
+ } else if (parent != NULL && vnode_isvroot(parent)) {
+ if (VATTR_IS_ACTIVE(args->a_vap, va_parentid)) {
+ // This vnode's parent is the root.
+ VATTR_RETURN(args->a_vap, va_parentid, BIND_ROOT_INO);
+ }
+ }
+ }
+ }
+
+ return error;
+}
+
+static int
+bindfs_open(struct vnop_open_args * args)
+{
+ int error;
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+
+ vp = args->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+ error = vnode_getwithref(lvp);
+ if (error == 0) {
+ error = VNOP_OPEN(lvp, args->a_mode, args->a_context);
+ vnode_put(lvp);
+ }
+
+ return error;
+}
+
+static int
+bindfs_close(struct vnop_close_args * args)
+{
+ int error;
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+
+ vp = args->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+
+ error = vnode_getwithref(lvp);
+ if (error == 0) {
+ error = VNOP_CLOSE(lvp, args->a_fflag, args->a_context);
+ vnode_put(lvp);
+ }
+ return error;
+}
+
+/*
+ * We have to carry on the locking protocol on the bind layer vnodes
+ * as we progress through the tree. We also have to enforce read-only
+ * if this layer is mounted read-only.
+ */
+static int
+bind_lookup(struct vnop_lookup_args * ap)
+{
+ struct componentname * cnp = ap->a_cnp;
+ struct vnode * dvp = ap->a_dvp;
+ struct vnode *vp, *ldvp, *lvp;
+ struct mount * mp;
+ struct bind_mount * bind_mp;
+ int error;
+
+ BINDFSDEBUG("%s parent: %p component: %.*s\n", __FUNCTION__, ap->a_dvp, cnp->cn_namelen, cnp->cn_nameptr);
+
+ mp = vnode_mount(dvp);
+ /* rename and delete are not allowed. this is a read only file system */
+ if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME || cnp->cn_nameiop == CREATE) {
+ return EROFS;
+ }
+ bind_mp = MOUNTTOBINDMOUNT(mp);
+
+ // . and .. handling
+ if (cnp->cn_nameptr[0] == '.') {
+ if (cnp->cn_namelen == 1) {
+ vp = dvp;
+ } else if (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.') {
+ vp = (vnode_isvroot(dvp)) ? dvp : vnode_parent(dvp);
+ } else {
+ goto notdot;
+ }
+
+ error = vp ? vnode_get(vp) : ENOENT;
+
+ if (error == 0) {
+ *ap->a_vpp = vp;
+ }
+
+ return error;
+ }
+
+notdot:
+ ldvp = BINDVPTOLOWERVP(dvp);
+ vp = lvp = NULL;
+
+ /*
+ * Hold ldvp. The reference on it, owned by dvp, is lost in
+ * case of dvp reclamation.
+ */
+ error = vnode_getwithref(ldvp);
+ if (error) {
+ return error;
+ }
+
+ error = VNOP_LOOKUP(ldvp, &lvp, cnp, ap->a_context);
+
+ vnode_put(ldvp);
+
+ if ((error == 0 || error == EJUSTRETURN) && lvp != NULL) {
+ if (ldvp == lvp) {
+ vp = dvp;
+ error = vnode_get(vp);
+ } else {
+ error = bind_nodeget(mp, lvp, dvp, &vp, cnp, 0);
+ }
+ if (error == 0) {
+ *ap->a_vpp = vp;
+ }
+ }
+
+ /* if we got lvp, drop the iocount from VNOP_LOOKUP */
+ if (lvp != NULL) {
+ vnode_put(lvp);
+ }
+
+ return error;
+}
+
+/*
+ * Don't think this needs to do anything
+ */
+static int
+bind_inactive(__unused struct vnop_inactive_args * ap)
+{
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
+
+ return 0;
+}
+
+static int
+bind_reclaim(struct vnop_reclaim_args * ap)
+{
+ struct vnode * vp;
+ struct bind_node * xp;
+ struct vnode * lowervp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
+
+ vp = ap->a_vp;
+
+ xp = VTOBIND(vp);
+ lowervp = xp->bind_lowervp;
+
+ vnode_removefsref(vp);
+
+ bind_hashrem(xp);
+ vnode_getwithref(lowervp);
+ vnode_rele(lowervp);
+ vnode_put(lowervp);
+
+ cache_purge(vp);
+ vnode_clearfsnode(vp);
+
+ FREE(xp, M_TEMP);
+
+ return 0;
+}
+
+/* Get dirent length padded to 4 byte alignment */
+#define DIRENT_LEN(namelen) \
+ ((sizeof(struct dirent) + (namelen + 1) - (__DARWIN_MAXNAMLEN + 1) + 3) & ~3)
+
+/* Get the end of this dirent */
+#define DIRENT_END(dep) \
+ (((char *)(dep)) + (dep)->d_reclen - 1)
+
+static int
+bindfs_readdir(struct vnop_readdir_args * ap)
+{
+ struct vnode *vp, *lvp, *dvp;
+ int error;
+ uio_t uio = ap->a_uio;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
+ /* assumption is that any vp that comes through here had to go through lookup
+ */
+
+ if (ap->a_flags & (VNODE_READDIR_EXTENDED | VNODE_READDIR_REQSEEKOFF)) {
+ return EINVAL;
+ }
+
+ vp = ap->a_vp;
+ dvp = vnode_parent(vp);
+ lvp = BINDVPTOLOWERVP(vp);
+ error = vnode_getwithref(lvp);
+ if (error != 0) {
+ goto lb_end;
+ }
+
+ if (vnode_isvroot(vp) || (dvp != NULL && vnode_isvroot(dvp))) {
+ size_t bufsize;
+ void * bufptr;
+ uio_t auio;
+ struct dirent *dep;
+ size_t bytesread;
+ bufsize = 3 * MIN((user_size_t)uio_resid(uio), 87371u) / 8;
+ MALLOC(bufptr, void *, bufsize, M_TEMP, M_WAITOK);
+ if (bufptr == NULL) {
+ return ENOMEM;
+ }
+ auio = uio_create(1, 0, UIO_SYSSPACE, UIO_READ);
+ uio_addiov(auio, (uintptr_t)bufptr, bufsize);
+ uio_setoffset(auio, uio_offset(uio));
+ error = VNOP_READDIR(lvp, auio, ap->a_flags, ap->a_eofflag, ap->a_numdirent, ap->a_context);
+ vnode_put(lvp);
+ if (error != 0) {
+ goto lb_end;
+ }
+
+ dep = (struct dirent *)bufptr;
+ bytesread = bufsize - uio_resid(auio);
+ while (error == 0 && (char *)dep < ((char *)bufptr + bytesread)) {
+ if (DIRENT_END(dep) > ((char *)bufptr + bytesread) ||
+ DIRENT_LEN(dep->d_namlen) > dep->d_reclen) {
+ printf("%s: %s: Bad dirent received from directory %s\n", __func__,
+ vfs_statfs(vnode_mount(vp))->f_mntonname,
+ vp->v_name ? vp->v_name : "<unknown>");
+ error = EIO;
+ break;
+ }
+ if (dep->d_name[0] == '.') {
+ /* re-write the inode number for the mount root */
+ /* if vp is the mount root then . = 2 and .. = 2 */
+ /* if the parent of vp is the mount root then .. = 2 */
+ if ((vnode_isvroot(vp) && dep->d_namlen == 1) ||
+ (dep->d_namlen == 2 && dep->d_name[1] == '.')) {
+ dep->d_ino = BIND_ROOT_INO;
+ }
+ }
+ /* Copy entry64 to user's buffer. */
+ error = uiomove((caddr_t)dep, dep->d_reclen, uio);
+ /* Move to next entry. */
+ dep = (struct dirent *)((char *)dep + dep->d_reclen);
+ }
+ /* Update the real offset using the offset we got from VNOP_READDIR. */
+ if (error == 0) {
+ uio_setoffset(uio, uio_offset(auio));
+ }
+ uio_free(auio);
+ FREE(bufptr, M_TEMP);
+ } else {
+ error = VNOP_READDIR(lvp, ap->a_uio, ap->a_flags, ap->a_eofflag, ap->a_numdirent, ap->a_context);
+ vnode_put(lvp);
+ }
+
+lb_end:
+ return error;
+}
+
+static int
+bindfs_readlink(struct vnop_readlink_args * ap)
+{
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
+ int error;
+ struct vnode *vp, *lvp;
+
+ vp = ap->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+
+ error = vnode_getwithref(lvp);
+ if (error == 0) {
+ error = VNOP_READLINK(lvp, ap->a_uio, ap->a_context);
+ vnode_put(lvp);
+
+ if (error) {
+ printf("bindfs: readlink failed: %d\n", error);
+ }
+ }
+
+ return error;
+}
+
+static int
+bindfs_pathconf(__unused struct vnop_pathconf_args * args)
+{
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+ return EINVAL;
+}
+
+static int
+bindfs_fsync(__unused struct vnop_fsync_args * args)
+{
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+ return 0;
+}
+
+static int
+bindfs_mmap(struct vnop_mmap_args * args)
+{
+ int error;
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+
+ vp = args->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+ error = vnode_getwithref(lvp);
+ if (error == 0) {
+ error = VNOP_MMAP(lvp, args->a_fflags, args->a_context);
+ vnode_put(lvp);
+ }
+
+ return error;
+}
+
+static int
+bindfs_mnomap(struct vnop_mnomap_args * args)
+{
+ int error;
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+
+ vp = args->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+ error = vnode_getwithref(lvp);
+ if (error == 0) {
+ error = VNOP_MNOMAP(lvp, args->a_context);
+ vnode_put(lvp);
+ }
+
+ return error;
+}
+
+static int
+bindfs_getxattr(struct vnop_getxattr_args * args)
+{
+ int error;
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+
+ vp = args->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+ error = vnode_getwithref(lvp);
+ if (error == 0) {
+ error = VNOP_GETXATTR(lvp, args->a_name, args->a_uio, args->a_size, args->a_options, args->a_context);
+ vnode_put(lvp);
+ }
+
+ return error;
+}
+
+static int
+bindfs_listxattr(struct vnop_listxattr_args * args)
+{
+ int error;
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
+
+ vp = args->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+ error = vnode_getwithref(lvp);
+ if (error == 0) {
+ error = VNOP_LISTXATTR(lvp, args->a_uio, args->a_size, args->a_options, args->a_context);
+ vnode_put(lvp);
+ }
+
+ return error;
+}
+
+/* relies on v1 paging */
+static int
+bindfs_pagein(struct vnop_pagein_args * ap)
+{
+ int error = EIO;
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
+
+ vp = ap->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+
+ if (vnode_vtype(vp) != VREG) {
+ return ENOTSUP;
+ }
+
+ /*
+ * Ask VM/UBC/VFS to do our bidding
+ */
+ if (vnode_getwithvid(lvp, BINDVPTOLOWERVID(vp)) == 0) {
+ vm_offset_t ioaddr;
+ uio_t auio;
+ kern_return_t kret;
+ off_t bytes_to_commit;
+ off_t lowersize;
+ upl_t upl = ap->a_pl;
+ user_ssize_t bytes_remaining = 0;
+
+ auio = uio_create(1, ap->a_f_offset, UIO_SYSSPACE, UIO_READ);
+ if (auio == NULL) {
+ error = EIO;
+ goto exit_no_unmap;
+ }
+
+ kret = ubc_upl_map(upl, &ioaddr);
+ if (KERN_SUCCESS != kret) {
+ panic("bindfs_pagein: ubc_upl_map() failed with (%d)", kret);
+ }
+
+ ioaddr += ap->a_pl_offset;
+
+ error = uio_addiov(auio, (user_addr_t)ioaddr, ap->a_size);
+ if (error) {
+ goto exit;
+ }
+
+ lowersize = ubc_getsize(lvp);
+ if (lowersize != ubc_getsize(vp)) {
+ (void)ubc_setsize(vp, lowersize); /* ignore failures, nothing can be done */
+ }
+
+ error = VNOP_READ(lvp, auio, ((ap->a_flags & UPL_IOSYNC) ? IO_SYNC : 0), ap->a_context);
+
+ bytes_remaining = uio_resid(auio);
+ if (bytes_remaining > 0 && bytes_remaining <= (user_ssize_t)ap->a_size) {
+ /* zero bytes that weren't read in to the upl */
+ bzero((void*)((uintptr_t)(ioaddr + ap->a_size - bytes_remaining)), (size_t) bytes_remaining);
+ }
+
+exit:
+ kret = ubc_upl_unmap(upl);
+ if (KERN_SUCCESS != kret) {
+ panic("bindfs_pagein: ubc_upl_unmap() failed with (%d)", kret);
+ }
+
+ if (auio != NULL) {
+ uio_free(auio);
+ }
+
+exit_no_unmap:
+ if ((ap->a_flags & UPL_NOCOMMIT) == 0) {
+ if (!error && (bytes_remaining >= 0) && (bytes_remaining <= (user_ssize_t)ap->a_size)) {
+ /* only commit what was read in (page aligned)*/
+ bytes_to_commit = ap->a_size - bytes_remaining;
+ if (bytes_to_commit) {
+ /* need to make sure bytes_to_commit and byte_remaining are page aligned before calling ubc_upl_commit_range*/
+ if (bytes_to_commit & PAGE_MASK) {
+ bytes_to_commit = (bytes_to_commit & (~PAGE_MASK)) + (PAGE_MASK + 1);
+ assert(bytes_to_commit <= (off_t)ap->a_size);
+
+ bytes_remaining = ap->a_size - bytes_to_commit;
+ }
+ ubc_upl_commit_range(upl, ap->a_pl_offset, (upl_size_t)bytes_to_commit, UPL_COMMIT_FREE_ON_EMPTY);
+ }
+
+ /* abort anything thats left */
+ if (bytes_remaining) {
+ ubc_upl_abort_range(upl, ap->a_pl_offset + (upl_offset_t)bytes_to_commit, (upl_size_t)bytes_remaining, UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
+ }
+ } else {
+ ubc_upl_abort_range(upl, ap->a_pl_offset, (upl_size_t)ap->a_size, UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
+ }
+ }
+ vnode_put(lvp);
+ } else if ((ap->a_flags & UPL_NOCOMMIT) == 0) {
+ ubc_upl_abort_range(ap->a_pl, ap->a_pl_offset, (upl_size_t)ap->a_size, UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
+ }
+ return error;
+}
+
+static int
+bindfs_read(struct vnop_read_args * ap)
+{
+ int error = EIO;
+
+ struct vnode *vp, *lvp;
+
+ BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
+
+ vp = ap->a_vp;
+ lvp = BINDVPTOLOWERVP(vp);
+
+ /*
+ * First some house keeping
+ */
+ if (vnode_getwithvid(lvp, BINDVPTOLOWERVID(vp)) == 0) {
+ if (!vnode_isreg(lvp) && !vnode_islnk(lvp)) {
+ error = EPERM;
+ goto end;
+ }
+
+ if (uio_resid(ap->a_uio) == 0) {
+ error = 0;
+ goto end;
+ }
+
+ /*
+ * Now ask VM/UBC/VFS to do our bidding
+ */
+
+ error = VNOP_READ(lvp, ap->a_uio, ap->a_ioflag, ap->a_context);
+ if (error) {
+ printf("bindfs: VNOP_READ failed: %d\n", error);
+ }
+end:
+ vnode_put(lvp);
+ }
+ return error;
+}
+
+/*
+ * Global vfs data structures
+ */
+
+static const struct vnodeopv_entry_desc bindfs_vnodeop_entries[] = {
+ {.opve_op = &vnop_default_desc, .opve_impl = (vop_t)bindfs_default}, /* default */
+ {.opve_op = &vnop_getattr_desc, .opve_impl = (vop_t)bindfs_getattr}, /* getattr */
+ {.opve_op = &vnop_open_desc, .opve_impl = (vop_t)bindfs_open}, /* open */
+ {.opve_op = &vnop_close_desc, .opve_impl = (vop_t)bindfs_close}, /* close */
+ {.opve_op = &vnop_inactive_desc, .opve_impl = (vop_t)bind_inactive}, /* inactive */
+ {.opve_op = &vnop_reclaim_desc, .opve_impl = (vop_t)bind_reclaim}, /* reclaim */
+ {.opve_op = &vnop_lookup_desc, .opve_impl = (vop_t)bind_lookup}, /* lookup */
+ {.opve_op = &vnop_readdir_desc, .opve_impl = (vop_t)bindfs_readdir}, /* readdir */
+ {.opve_op = &vnop_readlink_desc, .opve_impl = (vop_t)bindfs_readlink}, /* readlink */
+ {.opve_op = &vnop_pathconf_desc, .opve_impl = (vop_t)bindfs_pathconf}, /* pathconf */
+ {.opve_op = &vnop_fsync_desc, .opve_impl = (vop_t)bindfs_fsync}, /* fsync */
+ {.opve_op = &vnop_mmap_desc, .opve_impl = (vop_t)bindfs_mmap}, /* mmap */
+ {.opve_op = &vnop_mnomap_desc, .opve_impl = (vop_t)bindfs_mnomap}, /* mnomap */
+ {.opve_op = &vnop_getxattr_desc, .opve_impl = (vop_t)bindfs_getxattr}, /* getxattr */
+ {.opve_op = &vnop_pagein_desc, .opve_impl = (vop_t)bindfs_pagein}, /* pagein */
+ {.opve_op = &vnop_read_desc, .opve_impl = (vop_t)bindfs_read}, /* read */
+ {.opve_op = &vnop_listxattr_desc, .opve_impl = (vop_t)bindfs_listxattr}, /* listxattr */
+ {.opve_op = NULL, .opve_impl = NULL},
+};
+
+const struct vnodeopv_desc bindfs_vnodeop_opv_desc = {.opv_desc_vector_p = &bindfs_vnodeop_p, .opv_desc_ops = bindfs_vnodeop_entries};
+
+//BINDFS Specific helper function
+
+int
+bindfs_getbackingvnode(vnode_t in_vp, vnode_t* out_vpp)
+{
+ int result = EINVAL;
+
+ if (out_vpp == NULL || in_vp == NULL) {
+ goto end;
+ }
+
+ struct vfsstatfs * sp = NULL;
+ mount_t mp = vnode_mount(in_vp);
+
+ sp = vfs_statfs(mp);
+ //If this isn't a bindfs vnode or it is but it's a special vnode
+ if (strcmp(sp->f_fstypename, "bindfs") != 0) {
+ *out_vpp = NULLVP;
+ result = ENOENT;
+ goto end;
+ }
+
+ vnode_t lvp = BINDVPTOLOWERVP(in_vp);
+ if ((result = vnode_getwithvid(lvp, BINDVPTOLOWERVID(in_vp)))) {
+ goto end;
+ }
+
+ *out_vpp = lvp;
+
+end:
+ return result;
+}
projects / apple / xnu.git / blobdiff