[net-next-2.6.git] / fs / befs / super.c

/*
 * super.c
 *
 * Copyright (C) 2001-2002 Will Dyson <will_dyson@pobox.com>
 *
 * Licensed under the GNU GPL. See the file COPYING for details.
 *
 */

#include <linux/fs.h>
#include <asm/page.h> /* for PAGE_SIZE */

#include "befs.h"
#include "super.h"

/**
 * load_befs_sb -- Read from disk and properly byteswap all the fields
 * of the befs superblock
 *
 *
 *
 *
 */
int
befs_load_sb(struct super_block *sb, befs_super_block * disk_sb)
{
	befs_sb_info *befs_sb = BEFS_SB(sb);

	/* Check the byte order of the filesystem */
	if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE)
	    befs_sb->byte_order = BEFS_BYTESEX_LE;
	else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE)
	    befs_sb->byte_order = BEFS_BYTESEX_BE;

	befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);
	befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);
	befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3);
	befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size);
	befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift);
	befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks);
	befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks);
	befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size);

	befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag);
	befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
	befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);

	befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
	befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
	befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);

	befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);
	befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);
	befs_sb->nls = NULL;

	return BEFS_OK;
}

int
befs_check_sb(struct super_block *sb)
{
	befs_sb_info *befs_sb = BEFS_SB(sb);

	/* Check magic headers of super block */
	if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)
	    || (befs_sb->magic2 != BEFS_SUPER_MAGIC2)
	    || (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {
		befs_error(sb, "invalid magic header");
		return BEFS_ERR;
	}

	/*
	 * Check blocksize of BEFS.
	 *
	 * Blocksize of BEFS is 1024, 2048, 4096 or 8192.
	 */

	if ((befs_sb->block_size != 1024)
	    && (befs_sb->block_size != 2048)
	    && (befs_sb->block_size != 4096)
	    && (befs_sb->block_size != 8192)) {
		befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);
		return BEFS_ERR;
	}

	if (befs_sb->block_size > PAGE_SIZE) {
		befs_error(sb, "blocksize(%u) cannot be larger"
			   "than system pagesize(%lu)", befs_sb->block_size,
			   PAGE_SIZE);
		return BEFS_ERR;
	}

	/*
	   * block_shift and block_size encode the same information
	   * in different ways as a consistency check.
	 */

	if ((1 << befs_sb->block_shift) != befs_sb->block_size) {
		befs_error(sb, "block_shift disagrees with block_size. "
			   "Corruption likely.");
		return BEFS_ERR;
	}

	if (befs_sb->log_start != befs_sb->log_end) {
		befs_error(sb, "Filesystem not clean! There are blocks in the "
			   "journal. You must boot into BeOS and mount this volume "
			   "to make it clean.");
		return BEFS_ERR;
	}

	return BEFS_OK;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* super.c
	3	*
	4	* Copyright (C) 2001-2002 Will Dyson <will_dyson@pobox.com>
	5	*
	6	* Licensed under the GNU GPL. See the file COPYING for details.
	7	*
	8	*/
	9
	10	#include <linux/fs.h>
2b3fffef	11	#include <asm/page.h> /* for PAGE_SIZE */
1da177e4 LT	12
	13	#include "befs.h"
	14	#include "super.h"
1da177e4 LT	15
	16	/**
	17	* load_befs_sb -- Read from disk and properly byteswap all the fields
	18	* of the befs superblock
	19	*
	20	*
	21	*
	22	*
	23	*/
	24	int
	25	befs_load_sb(struct super_block sb, befs_super_block disk_sb)
	26	{
	27	befs_sb_info *befs_sb = BEFS_SB(sb);
	28
	29	/* Check the byte order of the filesystem */
152b95a1	30	if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE)
1da177e4	31	befs_sb->byte_order = BEFS_BYTESEX_LE;
152b95a1 HH	32	else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE)
152b95a1 HH	33	befs_sb->byte_order = BEFS_BYTESEX_BE;
1da177e4 LT	34
	35	befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);
	36	befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);
	37	befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3);
	38	befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size);
	39	befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift);
	40	befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks);
	41	befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks);
	42	befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size);
	43
	44	befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag);
	45	befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
	46	befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);
	47
	48	befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
	49	befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
	50	befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
	51
	52	befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);
	53	befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);
	54	befs_sb->nls = NULL;
	55
	56	return BEFS_OK;
	57	}
	58
	59	int
	60	befs_check_sb(struct super_block *sb)
	61	{
	62	befs_sb_info *befs_sb = BEFS_SB(sb);
	63
	64	/* Check magic headers of super block */
	65	if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)
	66	\|\| (befs_sb->magic2 != BEFS_SUPER_MAGIC2)
	67	\|\| (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {
	68	befs_error(sb, "invalid magic header");
	69	return BEFS_ERR;
	70	}
	71
	72	/*
	73	* Check blocksize of BEFS.
	74	*
	75	* Blocksize of BEFS is 1024, 2048, 4096 or 8192.
	76	*/
	77
	78	if ((befs_sb->block_size != 1024)
	79	&& (befs_sb->block_size != 2048)
	80	&& (befs_sb->block_size != 4096)
	81	&& (befs_sb->block_size != 8192)) {
	82	befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);
	83	return BEFS_ERR;
	84	}
	85
	86	if (befs_sb->block_size > PAGE_SIZE) {
	87	befs_error(sb, "blocksize(%u) cannot be larger"
	88	"than system pagesize(%lu)", befs_sb->block_size,
	89	PAGE_SIZE);
	90	return BEFS_ERR;
	91	}
	92
	93	/*
	94	* block_shift and block_size encode the same information
	95	* in different ways as a consistency check.
	96	*/
	97
98	if ((1 << befs_sb->block_shift) != befs_sb->block_size) {
99	befs_error(sb, "block_shift disagrees with block_size. "
100	"Corruption likely.");
101	return BEFS_ERR;
102	}
103
104	if (befs_sb->log_start != befs_sb->log_end) {
105	befs_error(sb, "Filesystem not clean! There are blocks in the "
106	"journal. You must boot into BeOS and mount this volume "
107	"to make it clean.");
108	return BEFS_ERR;
109	}
110
111	return BEFS_OK;
112	}