提交 fab2c399 编写于 作者: J Joakim Tjernlund 提交者: David Woodhouse

[JFFS2] Use point(), if available, to check newly erased blocks.

Faster and won't trash the D-cache.
Signed-off-by: NJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
上级 7eafaed5
...@@ -317,6 +317,33 @@ static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_erasebl ...@@ -317,6 +317,33 @@ static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_erasebl
size_t retlen; size_t retlen;
int ret = -EIO; 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); ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!ebuf) { if (!ebuf) {
printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset); printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
......
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