[mirror_ubuntu-artful-kernel.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"

/*
 * befs_load_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)
{
	struct 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->flags = fs32_to_cpu(sb, disk_sb->flags);

	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)
{
	struct 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;
	}


	/* ag_shift also encodes the same information as blocks_per_ag in a
	 * different way, non-fatal consistency check
	 */
	if ((1 << befs_sb->ag_shift) != befs_sb->blocks_per_ag)
		befs_error(sb, "ag_shift disagrees with blocks_per_ag.");

	if (befs_sb->log_start != befs_sb->log_end ||
	    befs_sb->flags == BEFS_DIRTY) {
		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	15
11674239	16	/*
10145d61	17	* befs_load_sb -- Read from disk and properly byteswap all the fields
1da177e4	18	* of the befs superblock
1da177e4 LT	19	*/
1da177e4 LT	20	int
103c0fb3	21	befs_load_sb(struct super_block sb, befs_super_block disk_sb)
1da177e4	22	{
038428fc	23	struct befs_sb_info *befs_sb = BEFS_SB(sb);
1da177e4 LT	24
1da177e4 LT	25	/* Check the byte order of the filesystem */
152b95a1	26	if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE)
103c0fb3	27	befs_sb->byte_order = BEFS_BYTESEX_LE;
152b95a1	28	else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE)
103c0fb3	29	befs_sb->byte_order = BEFS_BYTESEX_BE;
1da177e4 LT	30
	31	befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);
	32	befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);
	33	befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3);
	34	befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size);
	35	befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift);
	36	befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks);
	37	befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks);
	38	befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size);
	39
	40	befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag);
	41	befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
	42	befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);
	43
6ea4558f ST	44	befs_sb->flags = fs32_to_cpu(sb, disk_sb->flags);
6ea4558f ST	45
1da177e4 LT	46	befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
	47	befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
	48	befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
	49
	50	befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);
	51	befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);
	52	befs_sb->nls = NULL;
	53
	54	return BEFS_OK;
	55	}
	56
	57	int
	58	befs_check_sb(struct super_block *sb)
	59	{
038428fc	60	struct befs_sb_info *befs_sb = BEFS_SB(sb);
1da177e4 LT	61
	62	/* Check magic headers of super block */
	63	if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)
	64	\|\| (befs_sb->magic2 != BEFS_SUPER_MAGIC2)
	65	\|\| (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {
	66	befs_error(sb, "invalid magic header");
	67	return BEFS_ERR;
	68	}
	69
	70	/*
	71	* Check blocksize of BEFS.
	72	*
	73	* Blocksize of BEFS is 1024, 2048, 4096 or 8192.
	74	*/
	75
	76	if ((befs_sb->block_size != 1024)
	77	&& (befs_sb->block_size != 2048)
	78	&& (befs_sb->block_size != 4096)
	79	&& (befs_sb->block_size != 8192)) {
	80	befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);
	81	return BEFS_ERR;
	82	}
	83
	84	if (befs_sb->block_size > PAGE_SIZE) {
103c0fb3	85	befs_error(sb, "blocksize(%u) cannot be larger "
1da177e4 LT	86	"than system pagesize(%lu)", befs_sb->block_size,
	87	PAGE_SIZE);
	88	return BEFS_ERR;
	89	}
	90
	91	/*
11674239 LB	92	* block_shift and block_size encode the same information
11674239 LB	93	* in different ways as a consistency check.
1da177e4 LT	94	*/
	95
	96	if ((1 << befs_sb->block_shift) != befs_sb->block_size) {
	97	befs_error(sb, "block_shift disagrees with block_size. "
	98	"Corruption likely.");
	99	return BEFS_ERR;
	100	}
	101
bbe1bd0b LB	102
	103	/* ag_shift also encodes the same information as blocks_per_ag in a
	104	* different way, non-fatal consistency check
	105	*/
	106	if ((1 << befs_sb->ag_shift) != befs_sb->blocks_per_ag)
	107	befs_error(sb, "ag_shift disagrees with blocks_per_ag.");
	108
103c0fb3 LB	109	if (befs_sb->log_start != befs_sb->log_end \|\|
103c0fb3 LB	110	befs_sb->flags == BEFS_DIRTY) {
1da177e4	111	befs_error(sb, "Filesystem not clean! There are blocks in the "
103c0fb3 LB	112	"journal. You must boot into BeOS and mount this "
103c0fb3 LB	113	"volume to make it clean.");
1da177e4 LT	114	return BEFS_ERR;
	115	}
	116
	117	return BEFS_OK;
	118	}