Signed-off-by: Josef 'Jeff' Sipek <jeffpc@xxxxxxxxxxxxxx>
---
fs/cmsfs/helpers.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 78 insertions(+), 0 deletions(-)
create mode 100644 fs/cmsfs/helpers.c
diff --git a/fs/cmsfs/helpers.c b/fs/cmsfs/helpers.c
new file mode 100644
index 0000000..93800b3
--- /dev/null
+++ b/fs/cmsfs/helpers.c
@@ -0,0 +1,78 @@
+/*
+ * CMSFS
+ *
+ * (C) 2008 Josef 'Jeff' Sipek <jeffpc@xxxxxxxxxxxxxx>
+ *
+ * Based on cmsfs from 2.4.12-ac6:
+ *
+ * (C) 2001 Rick Troth <rtroth@xxxxxxx>
+ * (C) 2001 BMC Software, Inc., Houston, Texas, USA
+ *
+ */
+
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+
+#include "cmsfs.h"
+
+void munge_name(__u8 *name, char *outname)
+{
+ __u8 *p = name;
+ char *orig_outname = outname;
+
+ if (!name)
+ return;
+
+ /*
+ * NOTE:
+ * '\x40' is a space in EBCDIC
+ * '\x4b' is a period in EBCDIC
+ */
+
+ /* file name */
+ while(*p != '\x40' && (p - name < 8))
+ *outname++ = *p++;
+
+ *outname++ = '\x4b';
+
+ p = name+8;
+
+ while(*p != '\x40' && (p - name < 16))
+ *outname++ = *p++;
+
+ *outname = '\0';
+
+ EBC2ASC(orig_outname, 17);
+}
+
+/**
+ * cmsfs_read_block - read a single disk block
+ * @sb: superblock to read from
+ * @buf: buffer to fill
+ * @block: block number to read
+ * @blocksize: blocksize to use
+ */
+int cmsfs_read_block(struct super_block *sb, void *buf, int block,
+ unsigned blocksize)
+{
+ struct buffer_head * bh;
+
+ /* for the moment, we only deal with physical blocks */
+ BUG_ON(blocksize != sb->s_blocksize);
+
+ /* We could maybe handle that case by breaking-up this call into
+ multiple bread() calls, but that'll be a later driver rev. */
+
+ /* Call the system-level __bread() */
+ bh = __bread(sb->s_bdev, block, blocksize);
+ if (!bh) {
+ printk(KERN_WARNING "cmsfs: system bread() failed.\n");
+ return -EIO;
+ }
+
+ /* copy the data part, then release the VFS buffer */
+ memmove(buf, bh->b_data, blocksize);
+ brelse(bh);
+
+ return blocksize;
+}
--
1.5.6.3
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