summaryrefslogtreecommitdiff
path: root/fs/befs/super.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/befs/super.c')
-rw-r--r--fs/befs/super.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/fs/befs/super.c b/fs/befs/super.c
new file mode 100644
index 000000000..aeafc4d84
--- /dev/null
+++ b/fs/befs/super.c
@@ -0,0 +1,112 @@
+/*
+ * 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)
+{
+ 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->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;
+ }
+
+ 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;
+}