1 files changed, 83 insertions, 0 deletions

diff --git a/fs/befs/io.c b/fs/befs/io.c
new file mode 100644
index 000000000000..ddef98aa255d
--- /dev/null
+++ b/fs/befs/io.c
@@ -0,0 +1,83 @@
+/*
+ * linux/fs/befs/io.c
+ *
+ * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
+ *
+ * Based on portions of file.c and inode.c 
+ * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
+ *
+ * Many thanks to Dominic Giampaolo, author of Practical File System
+ * Design with the Be File System, for such a helpful book.
+ *
+ */
+
+#include <linux/buffer_head.h>
+
+#include "befs.h"
+#include "io.h"
+
+/*
+ * Converts befs notion of disk addr to a disk offset and uses
+ * linux kernel function sb_bread() to get the buffer containing
+ * the offset. -Will Dyson
+ *
+ */
+
+struct buffer_head *
+befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
+{
+        struct buffer_head *bh = NULL;
+        befs_blocknr_t block = 0;
+        befs_sb_info *befs_sb = BEFS_SB(sb);
+
+        befs_debug(sb, "---> Enter befs_read_iaddr() "
+                   "[%u, %hu, %hu]",
+                   iaddr.allocation_group, iaddr.start, iaddr.len);
+
+        if (iaddr.allocation_group > befs_sb->num_ags) {
+                befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
+                           iaddr.allocation_group, befs_sb->num_ags);
+                goto error;
+        }
+
+        block = iaddr2blockno(sb, &iaddr);
+
+        befs_debug(sb, "befs_read_iaddr: offset = %lu", block);
+
+        bh = sb_bread(sb, block);
+
+        if (bh == NULL) {
+                befs_error(sb, "Failed to read block %lu", block);
+                goto error;
+        }
+
+        befs_debug(sb, "<--- befs_read_iaddr()");
+        return bh;
+
+      error:
+        befs_debug(sb, "<--- befs_read_iaddr() ERROR");
+        return NULL;
+}
+
+struct buffer_head *
+befs_bread(struct super_block *sb, befs_blocknr_t block)
+{
+        struct buffer_head *bh = NULL;
+
+        befs_debug(sb, "---> Enter befs_read() %Lu", block);
+
+        bh = sb_bread(sb, block);
+
+        if (bh == NULL) {
+                befs_error(sb, "Failed to read block %lu", block);
+                goto error;
+        }
+
+        befs_debug(sb, "<--- befs_read()");
+
+        return bh;
+
+      error:
+        befs_debug(sb, "<--- befs_read() ERROR");
+        return NULL;
+}