[JFFS2] Add support for JFFS2-on-Dataflash devices.

For Dataflash, can_mark_obsolete = false and the NAND write buffering
code (wbuf.c) is used.

Since the DataFlash chip will automatically erase pages when writing,
the cleanmarkers are not needed - so cleanmarker_oob = false and
cleanmarker_size = 0

DataFlash page-sizes are not a power of two (they're multiples of 528
bytes).  The SECTOR_ADDR macro (added in the previous core patch) is
replaced with a (slower) div/mod version if CONFIG_JFFS2_FS_DATAFLASH is
selected.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 20 insertions, 1 deletions

diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index 30ab233fe42..5b7c960a047 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: fs.c,v 1.51 2004/11/28 12:19:37 dedekind Exp $
+ * $Id: fs.c,v 1.52 2005/02/09 09:17:40 pavlov Exp $
  *
  */
 
@@ -456,6 +456,12 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
 		return -EINVAL;
 	}
 #endif
+#ifndef CONFIG_JFFS2_FS_DATAFLASH
+	if (c->mtd->type == MTD_DATAFLASH) {
+		printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n");
+		return -EINVAL;
+	}
+#endif
 
 	c->flash_size = c->mtd->size;
 
@@ -661,6 +667,14 @@ static int jffs2_flash_setup(struct jffs2_sb_info *c) {
 		if (ret)
 			return ret;
 	}
+	
+	/* and Dataflash */
+	if (jffs2_dataflash(c)) {
+		ret = jffs2_dataflash_setup(c);
+		if (ret)
+			return ret;
+	}
+	
 	return ret;
 }
 
@@ -674,4 +688,9 @@ void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
 	if (jffs2_nor_ecc(c)) {
 		jffs2_nor_ecc_flash_cleanup(c);
 	}
+	
+	/* and DataFlash */
+	if (jffs2_dataflash(c)) {
+		jffs2_dataflash_cleanup(c);
+	}
 }