Eric Lee / smarc-ti-linux-kernel

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fs/befs/super.c 3.04 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   * 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>
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  #include <asm/page.h> /* for PAGE_SIZE */
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #include "befs.h"
  #include "super.h"
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  /**
   * 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 */
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  	if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE)
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  	    befs_sb->byte_order = BEFS_BYTESEX_LE;
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  	else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE)
  	    befs_sb->byte_order = BEFS_BYTESEX_BE;
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  	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;
  }