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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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35
fs/jffs2/wbuf.c
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@@ -9,7 +9,7 @@
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: wbuf.c,v 1.87 2005/02/09 09:09:02 pavlov Exp $
* $Id: wbuf.c,v 1.88 2005/02/09 09:17:41 pavlov Exp $
*
*/
@@ -435,7 +435,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
if we have a switch to next page, we will not have
enough remaining space for this.
*/
if (pad) {
if (pad && !jffs2_dataflash(c)) {
c->wbuf_len = PAD(c->wbuf_len);
/* Pad with JFFS2_DIRTY_BITMASK initially. this helps out ECC'd NOR
@@ -486,7 +486,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
spin_lock(&c->erase_completion_lock);
/* Adjust free size of the block if we padded. */
if (pad) {
if (pad && !jffs2_dataflash(c)) {
struct jffs2_eraseblock *jeb;
jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
@@ -604,8 +604,14 @@ int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
return ret;
}
#ifdef CONFIG_JFFS2_FS_DATAFLASH
#define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
#define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
#else
#define PAGE_DIV(x) ( (x) & (~(c->wbuf_pagesize - 1)) )
#define PAGE_MOD(x) ( (x) & (c->wbuf_pagesize - 1) )
#endif
int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsigned long count, loff_t to, size_t *retlen, uint32_t ino)
{
struct kvec outvecs[3];
@@ -1192,6 +1198,29 @@ void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
kfree(c->wbuf);
}
#ifdef CONFIG_JFFS2_FS_DATAFLASH
int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
c->cleanmarker_size = 0; /* No cleanmarkers needed */
/* Initialize write buffer */
init_rwsem(&c->wbuf_sem);
c->wbuf_pagesize = c->sector_size;
c->wbuf_ofs = 0xFFFFFFFF;
c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
if (!c->wbuf)
return -ENOMEM;
printk(KERN_INFO "JFFS2 write-buffering enabled (%i)\n", c->wbuf_pagesize);
return 0;
}
void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
kfree(c->wbuf);
}
#endif
#ifdef CONFIG_JFFS2_FS_NOR_ECC
int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) {
/* Cleanmarker is actually larger on the flashes */