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/* $NetBSD: v7fs_superblock.c,v 1.2 2011/07/18 21:51:49 apb Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: v7fs_superblock.c,v 1.2 2011/07/18 21:51:49 apb Exp $");
#if defined _KERNEL_OPT
#include "opt_v7fs.h"
#endif
#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/param.h> /* errno */
#else
#include <stdio.h>
#include <string.h>
#include <errno.h>
#endif
#include "v7fs.h"
#include "v7fs_impl.h"
#include "v7fs_endian.h"
#include "v7fs_superblock.h"
#include "v7fs_inode.h"
#include "v7fs_datablock.h"
#ifdef V7FS_SUPERBLOCK_DEBUG
#define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
#define DPRINTF_(fmt, args...) printf(fmt, ##args)
#else
#define DPRINTF(fmt, args...) ((void)0)
#define DPRINTF_(fmt, args...) ((void)0)
#endif
static void v7fs_superblock_endian_convert(struct v7fs_self *,
struct v7fs_superblock *, struct v7fs_superblock *);
static int v7fs_superblock_sanity(struct v7fs_self *);
/* Load superblock from disk. */
int
v7fs_superblock_load(struct v7fs_self *fs)
{
struct v7fs_superblock *disksb;
void *buf;
int error;
if (!(buf = scratch_read(fs, V7FS_SUPERBLOCK_SECTOR)))
return EIO;
disksb = (struct v7fs_superblock *)buf;
v7fs_superblock_endian_convert(fs, &fs->superblock, disksb);
scratch_free(fs, buf);
if ((error = v7fs_superblock_sanity(fs)))
return error;
return 0;
}
/* Writeback superblock to disk. */
int
v7fs_superblock_writeback(struct v7fs_self *fs)
{
struct v7fs_superblock *memsb = &fs->superblock;
struct v7fs_superblock *disksb;
void *buf;
int error = 0;
if (!memsb->modified)
return 0;
if (!(buf = scratch_read(fs, V7FS_SUPERBLOCK_SECTOR)))
return EIO;
disksb = (struct v7fs_superblock *)buf;
v7fs_superblock_endian_convert(fs, disksb, memsb);
if (!fs->io.write(fs->io.cookie, buf, V7FS_SUPERBLOCK_SECTOR))
error = EIO;
scratch_free(fs, buf);
memsb->modified = 0;
DPRINTF("done. %d\n", error);
return error;
}
/* Check endian mismatch. */
static int
v7fs_superblock_sanity(struct v7fs_self *fs)
{
const struct v7fs_superblock *sb = &fs->superblock;
void *buf = 0;
if ((sb->volume_size < 128) || /* smaller than 64KB. */
(sb->datablock_start_sector > sb->volume_size) ||
(sb->nfreeinode > V7FS_MAX_FREEINODE) ||
(sb->nfreeblock > V7FS_MAX_FREEBLOCK) ||
(sb->update_time < 0) ||
(sb->total_freeblock > sb->volume_size) ||
((sb->nfreeinode == 0) && (sb->nfreeblock == 0) &&
(sb->total_freeblock == 0) && (sb->total_freeinode == 0)) ||
(!(buf = scratch_read(fs, sb->volume_size - 1)))) {
DPRINTF("invalid super block.\n");
return EINVAL;
}
if (buf)
scratch_free(fs, buf);
return 0;
}
/* Fill free block to superblock cache. */
int
v7fs_freeblock_update(struct v7fs_self *fs, v7fs_daddr_t blk)
{
/* Assume superblock is locked by caller. */
struct v7fs_superblock *sb = &fs->superblock;
struct v7fs_freeblock *fb;
void *buf;
int error;
/* Read next freeblock table from disk. */
if (!datablock_number_sanity(fs, blk) || !(buf = scratch_read(fs, blk)))
return EIO;
/* Update in-core superblock freelist. */
fb = (struct v7fs_freeblock *)buf;
if ((error = v7fs_freeblock_endian_convert(fs, fb))) {
scratch_free(fs, buf);
return error;
}
DPRINTF("freeblock table#%d, nfree=%d\n", blk, fb->nfreeblock);
memcpy(sb->freeblock, fb->freeblock, sizeof(blk) * fb->nfreeblock);
sb->nfreeblock = fb->nfreeblock;
sb->modified = true;
scratch_free(fs, buf);
return 0;
}
int
v7fs_freeblock_endian_convert(struct v7fs_self *fs __unused,
struct v7fs_freeblock *fb __unused)
{
#ifdef V7FS_EI
int i;
int16_t nfree;
nfree = V7FS_VAL16(fs, fb->nfreeblock);
if (nfree <= 0 || nfree > V7FS_MAX_FREEBLOCK) {
DPRINTF("invalid freeblock list. %d (max=%d)\n", nfree,
V7FS_MAX_FREEBLOCK);
return ENOSPC;
}
fb->nfreeblock = nfree;
for (i = 0; i < nfree; i++) {
fb->freeblock[i] = V7FS_VAL32(fs, fb->freeblock[i]);
}
#endif /* V7FS_EI */
return 0;
}
/* Fill free inode to superblock cache. */
int
v7fs_freeinode_update(struct v7fs_self *fs)
{
/* Assume superblock is locked by caller. */
struct v7fs_superblock *sb = &fs->superblock;
v7fs_ino_t *freeinode = sb->freeinode;
size_t i, j, k;
v7fs_ino_t ino;
/* Loop over all inode list. */
for (i = V7FS_ILIST_SECTOR, ino = 1/* inode start from 1*/, k = 0;
i < sb->datablock_start_sector; i++) {
struct v7fs_inode_diskimage *di;
void *buf;
if (!(buf = scratch_read(fs, i))) {
DPRINTF("block %zu I/O error.\n", i);
ino += V7FS_INODE_PER_BLOCK;
continue;
}
di = (struct v7fs_inode_diskimage *)buf;
for (j = 0;
(j < V7FS_INODE_PER_BLOCK) && (k < V7FS_MAX_FREEINODE);
j++, di++, ino++) {
if (v7fs_inode_allocated(di))
continue;
DPRINTF("free inode%d\n", ino);
freeinode[k++] = ino;
}
scratch_free(fs, buf);
}
sb->nfreeinode = k;
return 0;
}
static void
v7fs_superblock_endian_convert(struct v7fs_self *fs __unused,
struct v7fs_superblock *to, struct v7fs_superblock *from)
{
#ifdef V7FS_EI
#define conv16(m) (to->m = V7FS_VAL16(fs, from->m))
#define conv32(m) (to->m = V7FS_VAL32(fs, from->m))
int i;
conv16(datablock_start_sector);
conv32(volume_size);
conv16(nfreeblock);
v7fs_daddr_t *dfrom = from->freeblock;
v7fs_daddr_t *dto = to->freeblock;
for (i = 0; i < V7FS_MAX_FREEBLOCK; i++, dfrom++, dto++)
*dto = V7FS_VAL32(fs, *dfrom);
conv16(nfreeinode);
v7fs_ino_t *ifrom = from->freeinode;
v7fs_ino_t *ito = to->freeinode;
for (i = 0; i < V7FS_MAX_FREEINODE; i++, ifrom++, ito++)
*ito = V7FS_VAL16(fs, *ifrom);
conv32(update_time);
conv32(total_freeblock);
conv16(total_freeinode);
#undef conv16
#undef conv32
#else /* V7FS_EI */
memcpy(to, from , sizeof(*to));
#endif /* V7FS_EI */
}
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