240 lines
7.3 KiB
C
240 lines
7.3 KiB
C
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/*
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* Copyright (c) 2012 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <kern/assert.h>
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#include <kern/debug.h>
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#include <libkern/libkern.h>
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#include <miscfs/mockfs/mockfs.h>
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#include <miscfs/mockfs/mockfs_fsnode.h>
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#include <miscfs/mockfs/mockfs_vnops.h>
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#include <miscfs/specfs/specdev.h>
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#include <sys/disk.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/mount_internal.h>
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#include <sys/vnode_internal.h>
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static LCK_GRP_DECLARE(mockfs_mtx_grp, "mockfs-mutex");
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int mockfs_mountroot(mount_t mp, vnode_t rvp, __unused vfs_context_t ctx);
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/*
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* Functions that are part of the mockfs_vfsops structure.
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*/
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int mockfs_unmount(__unused struct mount *mp, __unused int mntflags, __unused vfs_context_t ctx);
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int mockfs_root(mount_t mp, vnode_t * vpp, __unused vfs_context_t ctx);
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int mockfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx);
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int mockfs_init(__unused struct vfsconf * vfsc);
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/*
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* mockfs_mountroot:
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* Given a mount (mp) and a vnode for the root device (rvp), builds a fake filesystem for rvp. This consists
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* of three nodes; a directory node (to serve as a mountpoint for devfs), a file node meant to serve as an
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* executable frontend for rootvp (we will assume that rootvp is an executable, that the kernel can subsequently
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* run), and the root node for the mockfs filesystem. The structure of mockfs is memory-backed; only the
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* contents of the file node refer to the backing device.
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*
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* Returns 0 on success, or an error.
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*/
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int
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mockfs_mountroot(mount_t mp, vnode_t rvp, __unused vfs_context_t ctx)
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{
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int rvalue = 0;
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mockfs_fsnode_t root_fsnode = NULL;
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mockfs_fsnode_t dev_fsnode = NULL;
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mockfs_fsnode_t file_fsnode = NULL;
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mockfs_mount_t mockfs_mount_data = NULL;
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dk_memdev_info_t memdev_info;
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/*
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* TODO: Validate that the device at least LOOKS like a mach-o (has a sane header); this would prevent us
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* from causing EBADMACHO panics further along the boot path.
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*/
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/*
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* There are no M_MOCKFS* definitions at the moment, just use M_TEMP.
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*/
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mockfs_mount_data = kalloc_type(struct mockfs_mount, Z_WAITOK | Z_ZERO);
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mockfs_fsnode_create(mp, MOCKFS_ROOT, &root_fsnode);
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mockfs_fsnode_create(mp, MOCKFS_DEV, &dev_fsnode);
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mockfs_fsnode_create(mp, MOCKFS_FILE, &file_fsnode);
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if (!root_fsnode || !dev_fsnode || !file_fsnode) {
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rvalue = ENOMEM;
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goto done;
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}
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/*
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* If rvp is a memory device (with a few caveats), we can point to the same physical memory as the device
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* and avoid pointless paging/copying; query the device node for the information we need to determine
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* if we can do this.
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*/
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bzero(&memdev_info, sizeof(memdev_info));
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if (!VNOP_IOCTL(rvp, DKIOCGETMEMDEVINFO, (caddr_t)&memdev_info, 0, NULL)) {
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/*
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* For the moment, we won't try to optimize when mi_phys is true.
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*/
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if (!mockfs_mount_data->mockfs_physical_memory) {
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mockfs_mount_data->mockfs_memory_backed = memdev_info.mi_mdev;
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mockfs_mount_data->mockfs_physical_memory = memdev_info.mi_phys;
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mockfs_mount_data->mockfs_memdev_base = memdev_info.mi_base;
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mockfs_mount_data->mockfs_memdev_size = memdev_info.mi_size;
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}
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}
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lck_mtx_init(&mockfs_mount_data->mockfs_mnt_mtx, &mockfs_mtx_grp, LCK_ATTR_NULL);
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/*
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* All of the needed nodes/structures have been set up; now we just need to establish the relationships
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* between the various mockfs nodes.
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*/
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if ((rvalue = mockfs_fsnode_adopt(root_fsnode, dev_fsnode))) {
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goto done;
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}
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if ((rvalue = mockfs_fsnode_adopt(root_fsnode, file_fsnode))) {
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goto done;
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}
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mockfs_mount_data->mockfs_root = root_fsnode;
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mp->mnt_data = (typeof(mp->mnt_data))mockfs_mount_data;
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done:
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if (rvalue) {
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if (file_fsnode) {
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mockfs_fsnode_destroy(file_fsnode);
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}
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if (dev_fsnode) {
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mockfs_fsnode_destroy(dev_fsnode);
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}
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if (root_fsnode) {
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mockfs_fsnode_destroy(root_fsnode);
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}
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if (mockfs_mount_data) {
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lck_mtx_destroy(&mockfs_mount_data->mockfs_mnt_mtx, &mockfs_mtx_grp);
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kfree_type(struct mockfs_mount, mockfs_mount_data);
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}
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}
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return rvalue;
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}
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/*
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* mockfs_unmount:
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* Given a mount (mp), and associated flags (mntflags), performs the necessary teardown to destroy the mount.
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*
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* Returns 0 on success, or an error.
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*/
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int
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mockfs_unmount(struct mount *mp, int mntflags, __unused vfs_context_t ctx)
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{
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int rvalue;
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int vflush_flags;
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mockfs_fsnode_t root_fsnode;
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mockfs_mount_t mockfs_mnt;
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vflush_flags = 0;
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mockfs_mnt = (mockfs_mount_t) mp->mnt_data;
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/*
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* Reclaim the vnodes for the mount (forcibly, if requested; given that mockfs only support mountroot
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* at the moment, this should ALWAYS be forced),
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*/
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if (mntflags & MNT_FORCE) {
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vflush_flags |= FORCECLOSE;
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}
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rvalue = vflush(mp, NULL, vflush_flags);
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if (rvalue) {
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return rvalue;
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}
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/*
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* Past this point, errors are likely to be unrecoverable, so panic if we're given any excuse; we
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* need to teardown the mockfs_mnt data now, so that VFS can cleanup the mount structure. Note
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* that clearing mockfs_root before destroying the fsnode tree is related to an implementation
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* detail of mockfs_fsnode_destroy (which will refuse to destroy the root node).
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*/
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root_fsnode = mockfs_mnt->mockfs_root;
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mockfs_mnt->mockfs_root = NULL;
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rvalue = mockfs_fsnode_destroy(root_fsnode);
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if (rvalue) {
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panic("mockfs_unmount: Failed to destroy the fsnode tree");
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}
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lck_mtx_destroy(&mockfs_mnt->mockfs_mnt_mtx, &mockfs_mtx_grp);
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kfree_type(struct mockfs_mount, mockfs_mnt);
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mp->mnt_data = NULL;
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return rvalue;
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}
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/*
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* mockfs_root:
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* Given a mount (mp), returns the root vnode (*vpp) for that mount with an iocount.
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*
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* Returns 0 on success, or an error.
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*/
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int
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mockfs_root(mount_t mp, vnode_t * vpp, __unused vfs_context_t ctx)
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{
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int rvalue;
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rvalue = mockfs_fsnode_vnode(((mockfs_mount_t) mp->mnt_data)->mockfs_root, vpp);
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return rvalue;
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}
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/*
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* mockfs_sync:
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* Returns success because we're a read-only filesystem.
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*
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* Returns 0.
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*/
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int
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mockfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx)
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{
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return 0;
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}
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int
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mockfs_init(__unused struct vfsconf * vfsc)
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{
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return 0;
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}
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struct vfsops mockfs_vfsops = {
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.vfs_unmount = mockfs_unmount,
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.vfs_root = mockfs_root,
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.vfs_sync = mockfs_sync,
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.vfs_init = mockfs_init,
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};
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