From fab2c399129273713b7dcc6a54cef17ca124a47f Mon Sep 17 00:00:00 2001 From: Joakim Tjernlund Date: Fri, 1 Jun 2007 15:14:09 +0200 Subject: [JFFS2] Use point(), if available, to check newly erased blocks. Faster and won't trash the D-cache. Signed-off-by: Joakim Tjernlund Signed-off-by: David Woodhouse --- fs/jffs2/erase.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c index bdab9bc51d6..e9e3c2c330c 100644 --- a/fs/jffs2/erase.c +++ b/fs/jffs2/erase.c @@ -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); -- cgit v1.2.3