301 lines
7.6 KiB
C
301 lines
7.6 KiB
C
/* $NetBSD: v7fs_inode.c,v 1.2 2011/07/18 21:51:49 apb Exp $ */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by UCHIYAMA Yasushi.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: v7fs_inode.c,v 1.2 2011/07/18 21:51:49 apb Exp $");
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#if defined _KERNEL_OPT
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#include "opt_v7fs.h"
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#endif
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#ifdef _KERNEL
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#include <sys/systm.h>
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#include <sys/param.h>
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#else
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#endif
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#include "v7fs.h"
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#include "v7fs_impl.h"
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#include "v7fs_endian.h"
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#include "v7fs_inode.h"
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#include "v7fs_superblock.h"
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#ifdef V7FS_INODE_DEBUG
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#define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
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#else
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#define DPRINTF(fmt, args...) ((void)0)
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#endif
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static void v7fs_inode_setup_disk_image(const struct v7fs_self *,
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struct v7fs_inode *, struct v7fs_inode_diskimage *);
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static int v7fs_inode_inquire_disk_location(const struct v7fs_self *,
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v7fs_ino_t, v7fs_daddr_t *, v7fs_daddr_t *);
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#ifdef V7FS_INODE_DEBUG
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static int v7fs_inode_block_sanity(const struct v7fs_superblock *,
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v7fs_daddr_t);
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static int
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v7fs_inode_block_sanity(const struct v7fs_superblock *sb, v7fs_daddr_t blk)
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{
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if ((blk < V7FS_ILIST_SECTOR) || (blk >= sb->datablock_start_sector)) {
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DPRINTF("invalid inode block#%d (%d-%d)\n", blk,
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V7FS_ILIST_SECTOR, sb->datablock_start_sector);
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return ENOSPC;
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}
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return 0;
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}
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#endif /* V7FS_INODE_DEBUG */
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int
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v7fs_inode_number_sanity(const struct v7fs_superblock *sb, v7fs_ino_t ino)
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{
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if (ino < V7FS_ROOT_INODE || ((size_t)ino >= V7FS_MAX_INODE(sb))) {
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DPRINTF("invalid inode#%d (%d-%zu)\n", ino,
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V7FS_ROOT_INODE, V7FS_MAX_INODE(sb));
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return ENOSPC;
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}
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return 0;
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}
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int
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v7fs_inode_allocate(struct v7fs_self *fs, v7fs_ino_t *ino)
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{
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struct v7fs_superblock *sb = &fs->superblock;
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v7fs_ino_t inode_number;
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int error = ENOSPC;
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*ino = 0;
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SUPERB_LOCK(fs);
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if (sb->total_freeinode == 0) {
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DPRINTF("inode exhausted!(1)\n");
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goto errexit;
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}
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/* If there is no free inode cache, update it. */
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if (sb->nfreeinode <= 0 && (error = v7fs_freeinode_update(fs))) {
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DPRINTF("inode exhausted!(2)\n");
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goto errexit;
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}
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/* Get inode from superblock cache. */
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KDASSERT(sb->nfreeinode <= V7FS_MAX_FREEINODE);
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inode_number = sb->freeinode[--sb->nfreeinode];
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sb->total_freeinode--;
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sb->modified = 1;
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if ((error = v7fs_inode_number_sanity(sb, inode_number))) {
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DPRINTF("new inode#%d %d %d\n", inode_number, sb->nfreeinode,
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sb->total_freeinode);
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DPRINTF("free inode list corupt\n");
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goto errexit;
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}
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*ino = inode_number;
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errexit:
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SUPERB_UNLOCK(fs);
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return error;
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}
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void
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v7fs_inode_deallocate(struct v7fs_self *fs, v7fs_ino_t ino)
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{
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struct v7fs_superblock *sb = &fs->superblock;
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struct v7fs_inode inode;
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memset(&inode, 0, sizeof(inode));
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inode.inode_number = ino;
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v7fs_inode_writeback(fs, &inode);
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SUPERB_LOCK(fs);
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if (sb->nfreeinode < V7FS_MAX_FREEINODE) {
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/* link to freeinode list. */
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sb->freeinode[sb->nfreeinode++] = ino;
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}
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/* If superblock inode cache is full, this inode charged by
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v7fs_freeinode_update() later. */
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sb->total_freeinode++;
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sb->modified = true;
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SUPERB_UNLOCK(fs);
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}
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void
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v7fs_inode_setup_memory_image(const struct v7fs_self *fs __unused,
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struct v7fs_inode *mem, struct v7fs_inode_diskimage *disk)
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{
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#define conv16(m) (mem->m = V7FS_VAL16(fs, (disk->m)))
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#define conv32(m) (mem->m = V7FS_VAL32(fs, (disk->m)))
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uint32_t addr;
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int i;
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memset(mem, 0, sizeof(*mem));
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conv16(mode);
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conv16(nlink);
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conv16(uid);
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conv16(gid);
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conv32(filesize);
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conv32(atime);
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conv32(mtime);
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conv32(ctime);
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for (i = 0; i < V7FS_NADDR; i++) {
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int j = i * 3; /* 3 byte each. (v7fs_daddr is 24bit) */
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/* expand to 4byte with endian conversion. */
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addr = V7FS_VAL24_READ(fs, &disk->addr[j]);
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mem->addr[i] = addr;
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}
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mem->device = 0;
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if (v7fs_inode_iscdev(mem) || v7fs_inode_isbdev(mem)) {
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mem->device = mem->addr[0];
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}
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#undef conv16
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#undef conv32
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}
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static void
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v7fs_inode_setup_disk_image(const struct v7fs_self *fs __unused,
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struct v7fs_inode *mem, struct v7fs_inode_diskimage *disk)
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{
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#define conv16(m) (disk->m = V7FS_VAL16(fs, (mem->m)))
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#define conv32(m) (disk->m = V7FS_VAL32(fs, (mem->m)))
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conv16(mode);
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conv16(nlink);
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conv16(uid);
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conv16(gid);
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conv32(filesize);
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conv32(atime);
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conv32(mtime);
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conv32(ctime);
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int i;
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for (i = 0; i < V7FS_NADDR; i++) {
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int j = i * 3; /* 3 byte each. */
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V7FS_VAL24_WRITE(fs, mem->addr[i], disk->addr + j);
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}
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#undef conv16
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#undef conv32
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}
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/* Load inode from disk. */
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int
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v7fs_inode_load(struct v7fs_self *fs, struct v7fs_inode *p, v7fs_ino_t n)
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{
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v7fs_daddr_t blk, ofs;
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struct v7fs_inode_diskimage *di;
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void *buf;
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if (v7fs_inode_inquire_disk_location(fs, n, &blk, &ofs) != 0)
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return ENOENT;
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ILIST_LOCK(fs);
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if (!(buf = scratch_read(fs, blk))) {
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ILIST_UNLOCK(fs);
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return EIO;
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}
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ILIST_UNLOCK(fs);
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di = (struct v7fs_inode_diskimage *)buf;
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/* Decode disk address, convert endian. */
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v7fs_inode_setup_memory_image(fs, p, di + ofs);
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p->inode_number = n;
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scratch_free(fs, buf);
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return 0;
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}
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/* Write back inode to disk. */
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int
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v7fs_inode_writeback(struct v7fs_self *fs, struct v7fs_inode *mem)
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{
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struct v7fs_inode_diskimage disk;
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v7fs_ino_t ino = mem->inode_number;
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v7fs_daddr_t blk;
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v7fs_daddr_t ofs;
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void *buf;
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int error = 0;
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if (v7fs_inode_inquire_disk_location(fs, ino, &blk, &ofs) != 0)
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return ENOENT;
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v7fs_inode_setup_disk_image(fs, mem, &disk);
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ILIST_LOCK(fs);
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if (!(buf = scratch_read(fs, blk))) {
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ILIST_UNLOCK(fs);
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return EIO;
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}
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struct v7fs_inode_diskimage *di = (struct v7fs_inode_diskimage *)buf;
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di[ofs] = disk; /* structure copy; */
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if (!fs->io.write(fs->io.cookie, buf, blk))
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error = EIO;
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ILIST_UNLOCK(fs);
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scratch_free(fs, buf);
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return error;
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}
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static int
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v7fs_inode_inquire_disk_location(const struct v7fs_self *fs
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__unused, v7fs_ino_t n, v7fs_daddr_t *block,
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v7fs_daddr_t *offset)
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{
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v7fs_daddr_t ofs, blk;
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#ifdef V7FS_INODE_DEBUG
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v7fs_inode_number_sanity(&fs->superblock, n);
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#endif
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ofs = (n - 1/*inode start from 1*/) *
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sizeof(struct v7fs_inode_diskimage);
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blk = ofs >> V7FS_BSHIFT;
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*block = blk + V7FS_ILIST_SECTOR;
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*offset = (ofs - blk * V7FS_BSIZE) /
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sizeof(struct v7fs_inode_diskimage);
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#ifdef V7FS_INODE_DEBUG
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return v7fs_inode_block_sanity(&fs->superblock, *block);
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#else
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return 0;
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#endif
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}
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