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

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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>
This commit is contained in:
Andrew Victor
2005-02-09 09:17:45 +00:00
committed by Thomas Gleixner
parent 3be36675d4
commit 8f15fd55f9
9 changed files with 98 additions and 17 deletions
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21
fs/jffs2/fs.c
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@@ -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);
}
}