1 files changed, 112 insertions, 0 deletions

diff --git a/fs/befs/super.c b/fs/befs/super.c
new file mode 100644
index 000000000000..4557acbac528
--- /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 "befs.h"
+#include "super.h"
+#include "endian.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;
+}