Commit fab2c399 authored by Joakim Tjernlund's avatar Joakim Tjernlund Committed by David Woodhouse
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[JFFS2] Use point(), if available, to check newly erased blocks. 



Faster and won't trash the D-cache.

Signed-off-by: default avatarJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
parent 7eafaed5

fs/jffs2/erase.c

+27 −0
Original line number Diff line number Diff line
@@ -317,6 +317,33 @@ static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_erasebl 
	size_t retlen;

	int ret = -EIO;



	if (c->mtd->point) {

		unsigned long *wordebuf;



		ret = c->mtd->point(c->mtd, jeb->offset, c->sector_size, &retlen, (unsigned char **)&ebuf);

		if (ret) {

			D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));

			goto do_flash_read;

		}

		if (retlen < c->sector_size) {

			/* Don't muck about if it won't let us point to the whole erase sector */

			D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));

			c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);

			goto do_flash_read;

		}

		wordebuf = ebuf-sizeof(*wordebuf);

		retlen /= sizeof(*wordebuf);

		do {

		   if (*++wordebuf != ~0)

			   break;

		} while(--retlen);

		c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);

		if (retlen)

			printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n",

			       *wordebuf, jeb->offset + c->sector_size-retlen*sizeof(*wordebuf));

		return 0;

	}

 do_flash_read:

	ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);

	if (!ebuf) {

		printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);