3 files changed, 77 insertions, 148 deletions

diff --git a/fs/jffs2/jffs2_fs_sb.h b/fs/jffs2/jffs2_fs_sb.h
index b98594992eed..ea88f69af130 100644
--- a/fs/jffs2/jffs2_fs_sb.h
+++ b/fs/jffs2/jffs2_fs_sb.h
@@ -98,20 +98,14 @@ struct jffs2_sb_info {
 	uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
 
 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
-	/* Write-behind buffer for NAND flash */
-	unsigned char *wbuf;
-	unsigned char *oobbuf;
+	unsigned char *wbuf; /* Write-behind buffer for NAND flash */
 	uint32_t wbuf_ofs;
 	uint32_t wbuf_len;
 	struct jffs2_inodirty *wbuf_inodes;
-
 	struct rw_semaphore wbuf_sem;	/* Protects the write buffer */
 
-	/* Information about out-of-band area usage... */
-	struct nand_ecclayout *ecclayout;
-	uint32_t badblock_pos;
-	uint32_t fsdata_pos;
-	uint32_t fsdata_len;
+	unsigned char *oobbuf;
+	int oobavail; /* How many bytes are available for JFFS2 in OOB */
 #endif
 
 	struct jffs2_summary *summary;		/* Summary information */
diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c
index 3af746eaff0e..31c1475d922a 100644
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -450,16 +450,20 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
 
 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	if (jffs2_cleanmarker_oob(c)) {
-		int ret = jffs2_check_nand_cleanmarker(c, jeb);
+		int ret;
+
+		if (c->mtd->block_isbad(c->mtd, jeb->offset))
+			return BLK_STATE_BADBLOCK;
+
+		ret = jffs2_check_nand_cleanmarker(c, jeb);
 		D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret));
+
 		/* Even if it's not found, we still scan to see
 		   if the block is empty. We use this information
 		   to decide whether to erase it or not. */
 		switch (ret) {
 		case 0:		cleanmarkerfound = 1; break;
 		case 1: 	break;
-		case 2: 	return BLK_STATE_BADBLOCK;
-		case 3:		return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */
 		default: 	return ret;
 		}
 	}
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 9c99859f5edd..58cb77baed8e 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -957,43 +957,48 @@ exit:
 	return ret;
 }
 
-#define NR_OOB_SCAN_PAGES	4
+#define NR_OOB_SCAN_PAGES 4
+
+/* For historical reasons we use only 12 bytes for OOB clean marker */
+#define OOB_CM_SIZE 12
+
+static const struct jffs2_unknown_node oob_cleanmarker =
+{
+	.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK),
+	.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
+	.totlen = cpu_to_je32(8)
+};
 
 /*
- * Check, if the out of band area is empty
+ * Check, if the out of band area is empty. This function knows about the clean
+ * marker and if it is present in OOB, treats the OOB as empty anyway.
  */
 int jffs2_check_oob_empty(struct jffs2_sb_info *c,
 			  struct jffs2_eraseblock *jeb, int mode)
 {
-	int i, page, ret;
-	int oobsize = c->mtd->oobsize;
+	int i, ret;
+	int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
 	struct mtd_oob_ops ops;
 
-	ops.ooblen = NR_OOB_SCAN_PAGES * oobsize;
+	ops.mode = MTD_OOB_AUTO;
+	ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail;
 	ops.oobbuf = c->oobbuf;
-	ops.ooboffs = 0;
+	ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
 	ops.datbuf = NULL;
-	ops.mode = MTD_OOB_PLACE;
 
 	ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops);
-	if (ret) {
-		D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB "
-			  "failed %d for block at %08x\n", ret, jeb->offset));
+	if (ret || ops.oobretlen != ops.ooblen) {
+		printk(KERN_ERR "cannot read OOB for EB at %08x, requested %d "
+				"bytes, read %d bytes, error %d\n", jeb->offset,
+				ops.ooblen, ops.oobretlen, ret);
+		if (!ret)
+			ret = -EIO;
 		return ret;
 	}
 
-	if (ops.oobretlen < ops.ooblen) {
-		D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB "
-			  "returned short read (%zd bytes not %d) for block "
-			  "at %08x\n", ops.oobretlen, ops.ooblen, jeb->offset));
-		return -EIO;
-	}
-
-	/* Special check for first page */
-	for(i = 0; i < oobsize ; i++) {
-		/* Yeah, we know about the cleanmarker. */
-		if (mode && i >= c->fsdata_pos &&
-		    i < c->fsdata_pos + c->fsdata_len)
+	for(i = 0; i < ops.ooblen; i++) {
+		if (mode && i < cmlen)
+			/* Yeah, we know about the cleanmarker */
 			continue;
 
 		if (ops.oobbuf[i] != 0xFF) {
@@ -1003,111 +1008,63 @@ int jffs2_check_oob_empty(struct jffs2_sb_info *c,
 		}
 	}
 
-	/* we know, we are aligned :) */
-	for (page = oobsize; page < ops.ooblen; page += sizeof(long)) {
-		long dat = *(long *)(&ops.oobbuf[page]);
-		if(dat != -1)
-			return 1;
-	}
 	return 0;
 }
 
 /*
- * Scan for a valid cleanmarker and for bad blocks
+ * Check for a valid cleanmarker.
+ * Returns: 0 if a valid cleanmarker was found
+ *          1 if no cleanmarker was found
+ *          negative error code if an error occurred
  */
-int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c,
-				  struct jffs2_eraseblock *jeb)
+int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c,
+				 struct jffs2_eraseblock *jeb)
 {
-	struct jffs2_unknown_node n;
 	struct mtd_oob_ops ops;
-	int oobsize = c->mtd->oobsize;
-	unsigned char *p,*b;
-	int i, ret;
-	size_t offset = jeb->offset;
-
-	/* Check first if the block is bad. */
-	if (c->mtd->block_isbad(c->mtd, offset)) {
-		D1 (printk(KERN_WARNING "jffs2_check_nand_cleanmarker()"
-			   ": Bad block at %08x\n", jeb->offset));
-		return 2;
-	}
+	int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
 
-	ops.ooblen = oobsize;
+	ops.mode = MTD_OOB_AUTO;
+	ops.ooblen = cmlen;
 	ops.oobbuf = c->oobbuf;
-	ops.ooboffs = 0;
+	ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
 	ops.datbuf = NULL;
-	ops.mode = MTD_OOB_PLACE;
 
-	ret = c->mtd->read_oob(c->mtd, offset, &ops);
-	if (ret) {
-		D1 (printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): "
-			   "Read OOB failed %d for block at %08x\n",
-			   ret, jeb->offset));
+	ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops);
+	if (ret || ops.oobretlen != ops.ooblen) {
+		printk(KERN_ERR "cannot read OOB for EB at %08x, requested %d "
+				"bytes, read %d bytes, error %d\n", jeb->offset,
+				ops.ooblen, ops.oobretlen, ret);
+		if (!ret)
+			ret = -EIO;
 		return ret;
 	}
 
-	if (ops.oobretlen < ops.ooblen) {
-		D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): "
-			    "Read OOB return short read (%zd bytes not %d) "
-			    "for block at %08x\n", ops.oobretlen, ops.ooblen,
-			    jeb->offset));
-		return -EIO;
-	}
-
-	n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
-	n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
-	n.totlen = cpu_to_je32 (8);
-	p = (unsigned char *) &n;
-	b = c->oobbuf + c->fsdata_pos;
-
-	for (i = c->fsdata_len; i; i--) {
-		if (*b++ != *p++)
-			ret = 1;
-	}
-
-	D1(if (ret == 1) {
-		printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): "
-		       "Cleanmarker node not detected in block at %08x\n",
-		       offset);
-		printk(KERN_WARNING "OOB at %08zx was ", offset);
-		for (i=0; i < oobsize; i++)
-			printk("%02x ", c->oobbuf[i]);
-		printk("\n");
-	});
-	return ret;
+	return !!memcmp(&oob_cleanmarker, c->oobbuf, cmlen);
 }
 
 int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c,
 				 struct jffs2_eraseblock *jeb)
 {
-	struct jffs2_unknown_node n;
-	int	ret;
+	int ret;
 	struct mtd_oob_ops ops;
+	int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
 
-	n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
-	n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER);
-	n.totlen = cpu_to_je32(8);
-
-	ops.ooblen = c->fsdata_len;
-	ops.oobbuf = (uint8_t *)&n;
-	ops.ooboffs = c->fsdata_pos;
+	ops.mode = MTD_OOB_AUTO;
+	ops.ooblen = cmlen;
+	ops.oobbuf = (uint8_t *)&oob_cleanmarker;
+	ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
 	ops.datbuf = NULL;
-	ops.mode = MTD_OOB_PLACE;
 
 	ret = c->mtd->write_oob(c->mtd, jeb->offset, &ops);
-
-	if (ret) {
-		D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): "
-			  "Write failed for block at %08x: error %d\n",
-			  jeb->offset, ret));
+	if (ret || ops.oobretlen != ops.ooblen) {
+		printk(KERN_ERR "cannot write OOB for EB at %08x, requested %d "
+				"bytes, read %d bytes, error %d\n", jeb->offset,
+				ops.ooblen, ops.oobretlen, ret);
+		if (!ret)
+			ret = -EIO;
 		return ret;
 	}
-	if (ops.oobretlen != ops.ooblen) {
-		D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): "
-			  "Short write for block at %08x: %zd not %d\n",
-			  jeb->offset, ops.oobretlen, ops.ooblen));
-		return -EIO;
-	}
+
 	return 0;
 }
 
@@ -1140,41 +1097,24 @@ int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *
 	return 1;
 }
 
-static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
+int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
 {
 	struct nand_ecclayout *oinfo = c->mtd->ecclayout;
 
-	/* Do this only, if we have an oob buffer */
 	if (!c->mtd->oobsize)
 		return 0;
 
 	/* Cleanmarker is out-of-band, so inline size zero */
 	c->cleanmarker_size = 0;
 
-	/* Should we use autoplacement ? */
-	if (!oinfo) {
-		D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n"));
+	if (!oinfo || oinfo->oobavail == 0) {
+		printk(KERN_ERR "inconsistent device description\n");
 		return -EINVAL;
 	}
 
-	D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n"));
-	/* Get the position of the free bytes */
-	if (!oinfo->oobfree[0].length) {
-		printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep."
-			" Autoplacement selected and no empty space in oob\n");
-		return -ENOSPC;
-	}
-	c->fsdata_pos = oinfo->oobfree[0].offset;
-	c->fsdata_len = oinfo->oobfree[0].length;
-	if (c->fsdata_len > 8)
-		c->fsdata_len = 8;
+	D1(printk(KERN_DEBUG "JFFS2 using OOB on NAND\n"));
 
-	return 0;
-}
-
-int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
-{
-	int res;
+	c->oobavail = oinfo->oobavail;
 
 	/* Initialise write buffer */
 	init_rwsem(&c->wbuf_sem);
@@ -1185,22 +1125,13 @@ int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
 	if (!c->wbuf)
 		return -ENOMEM;
 
-	c->oobbuf = kmalloc(NR_OOB_SCAN_PAGES * c->mtd->oobsize, GFP_KERNEL);
-	if (!c->oobbuf)
-		return -ENOMEM;
-
-	res = jffs2_nand_set_oobinfo(c);
-
-#ifdef BREAKME
-	if (!brokenbuf)
-		brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
-	if (!brokenbuf) {
+	c->oobbuf = kmalloc(NR_OOB_SCAN_PAGES * c->oobavail, GFP_KERNEL);
+	if (!c->oobbuf) {
 		kfree(c->wbuf);
 		return -ENOMEM;
 	}
-	memset(brokenbuf, 0xdb, c->wbuf_pagesize);
-#endif
-	return res;
+
+	return 0;
 }
 
 void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)