[linux.git] / fs / befs / super.c

/*
 * super.c
 *
 * Copyright (C) 2001-2002 Will Dyson <[email protected]>
 *
 * Licensed under the GNU GPL. See the file COPYING for details.
 *
 */

#include <linux/fs.h>

#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 (le32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
	    befs_sb->byte_order = BEFS_BYTESEX_LE;
	else if (be32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
	    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 <[email protected]>
	5	*
	6	* Licensed under the GNU GPL. See the file COPYING for details.
	7	*
	8	*/
	9
	10	#include <linux/fs.h>
	11
	12	#include "befs.h"
	13	#include "super.h"
1da177e4 LT	14
	15	/**
	16	* load_befs_sb -- Read from disk and properly byteswap all the fields
	17	* of the befs superblock
	18	*
	19	*
	20	*
	21	*
	22	*/
	23	int
	24	befs_load_sb(struct super_block sb, befs_super_block disk_sb)
	25	{
	26	befs_sb_info *befs_sb = BEFS_SB(sb);
	27
	28	/* Check the byte order of the filesystem */
	29	if (le32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
	30	befs_sb->byte_order = BEFS_BYTESEX_LE;
	31	else if (be32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
	32	befs_sb->byte_order = BEFS_BYTESEX_BE;
	33
	34	befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);
	35	befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);
	36	befs_sb->magic3 = fs32_to_cpu(sb, disk_sb->magic3);
	37	befs_sb->block_size = fs32_to_cpu(sb, disk_sb->block_size);
	38	befs_sb->block_shift = fs32_to_cpu(sb, disk_sb->block_shift);
	39	befs_sb->num_blocks = fs64_to_cpu(sb, disk_sb->num_blocks);
	40	befs_sb->used_blocks = fs64_to_cpu(sb, disk_sb->used_blocks);
	41	befs_sb->inode_size = fs32_to_cpu(sb, disk_sb->inode_size);
	42
	43	befs_sb->blocks_per_ag = fs32_to_cpu(sb, disk_sb->blocks_per_ag);
	44	befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
	45	befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);
	46
	47	befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
	48	befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
	49	befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
	50
	51	befs_sb->root_dir = fsrun_to_cpu(sb, disk_sb->root_dir);
	52	befs_sb->indices = fsrun_to_cpu(sb, disk_sb->indices);
	53	befs_sb->nls = NULL;
	54
	55	return BEFS_OK;
	56	}
	57
	58	int
	59	befs_check_sb(struct super_block *sb)
	60	{
	61	befs_sb_info *befs_sb = BEFS_SB(sb);
	62
	63	/* Check magic headers of super block */
	64	if ((befs_sb->magic1 != BEFS_SUPER_MAGIC1)
	65	\|\| (befs_sb->magic2 != BEFS_SUPER_MAGIC2)
	66	\|\| (befs_sb->magic3 != BEFS_SUPER_MAGIC3)) {
	67	befs_error(sb, "invalid magic header");
	68	return BEFS_ERR;
	69	}
	70
	71	/*
	72	* Check blocksize of BEFS.
	73	*
	74	* Blocksize of BEFS is 1024, 2048, 4096 or 8192.
	75	*/
	76
	77	if ((befs_sb->block_size != 1024)
78	&& (befs_sb->block_size != 2048)
79	&& (befs_sb->block_size != 4096)
80	&& (befs_sb->block_size != 8192)) {
81	befs_error(sb, "invalid blocksize: %u", befs_sb->block_size);
82	return BEFS_ERR;
83	}
84
85	if (befs_sb->block_size > PAGE_SIZE) {
86	befs_error(sb, "blocksize(%u) cannot be larger"
87	"than system pagesize(%lu)", befs_sb->block_size,
88	PAGE_SIZE);
89	return BEFS_ERR;
90	}
91
92	/*
93	* block_shift and block_size encode the same information
94	* in different ways as a consistency check.
95	*/
96
97	if ((1 << befs_sb->block_shift) != befs_sb->block_size) {
98	befs_error(sb, "block_shift disagrees with block_size. "
99	"Corruption likely.");
100	return BEFS_ERR;
101	}
102
103	if (befs_sb->log_start != befs_sb->log_end) {
104	befs_error(sb, "Filesystem not clean! There are blocks in the "
105	"journal. You must boot into BeOS and mount this volume "
106	"to make it clean.");
107	return BEFS_ERR;
108	}
109
110	return BEFS_OK;
111	}