openwrt/target/linux/generic/patches-3.0/512-jffs2_eofdetect.patch

--- a/fs/jffs2/build.c
+++ b/fs/jffs2/build.c
@@ -112,6 +112,17 @@ static int jffs2_build_filesystem(struct
 	dbg_fsbuild("scanned flash completely\n");
 	jffs2_dbg_dump_block_lists_nolock(c);
 
+	if (c->flags & (1 << 7)) {
+		printk("%s(): unlocking the mtd device... ", __func__);
+		if (c->mtd->unlock)
+			c->mtd->unlock(c->mtd, 0, c->mtd->size);
+		printk("done.\n");
+
+		printk("%s(): erasing all blocks after the end marker... ", __func__);
+		jffs2_erase_pending_blocks(c, -1);
+		printk("done.\n");
+	}
+
 	dbg_fsbuild("pass 1 starting\n");
 	c->flags |= JFFS2_SB_FLAG_BUILDING;
 	/* Now scan the directory tree, increasing nlink according to every dirent found. */
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -72,7 +72,7 @@ static int file_dirty(struct jffs2_sb_in
 		return ret;
 	if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size)))
 		return ret;
-	/* Turned wasted size into dirty, since we apparently 
+	/* Turned wasted size into dirty, since we apparently
 	   think it's recoverable now. */
 	jeb->dirty_size += jeb->wasted_size;
 	c->dirty_size += jeb->wasted_size;
@@ -147,8 +147,11 @@ int jffs2_scan_medium(struct jffs2_sb_in
 		/* reset summary info for next eraseblock scan */
 		jffs2_sum_reset_collected(s);
 
-		ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
-						buf_size, s);
+		if (c->flags & (1 << 7))
+			ret = BLK_STATE_ALLFF;
+		else
+			ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
+							buf_size, s);
 
 		if (ret < 0)
 			goto out;
@@ -405,7 +408,7 @@ static int jffs2_scan_xref_node(struct j
 	if (!ref)
 		return -ENOMEM;
 
-	/* BEFORE jffs2_build_xattr_subsystem() called, 
+	/* BEFORE jffs2_build_xattr_subsystem() called,
 	 * and AFTER xattr_ref is marked as a dead xref,
 	 * ref->xid is used to store 32bit xid, xd is not used
 	 * ref->ino is used to store 32bit inode-number, ic is not used
@@ -478,7 +481,7 @@ static int jffs2_scan_eraseblock (struct
 		struct jffs2_sum_marker *sm;
 		void *sumptr = NULL;
 		uint32_t sumlen;
-	      
+
 		if (!buf_size) {
 			/* XIP case. Just look, point at the summary if it's there */
 			sm = (void *)buf + c->sector_size - sizeof(*sm);
@@ -494,9 +497,9 @@ static int jffs2_scan_eraseblock (struct
 				buf_len = sizeof(*sm);
 
 			/* Read as much as we want into the _end_ of the preallocated buffer */
-			err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, 
+			err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len,
 						  jeb->offset + c->sector_size - buf_len,
-						  buf_len);				
+						  buf_len);
 			if (err)
 				return err;
 
@@ -515,9 +518,9 @@ static int jffs2_scan_eraseblock (struct
 				}
 				if (buf_len < sumlen) {
 					/* Need to read more so that the entire summary node is present */
-					err = jffs2_fill_scan_buf(c, sumptr, 
+					err = jffs2_fill_scan_buf(c, sumptr,
 								  jeb->offset + c->sector_size - sumlen,
-								  sumlen - buf_len);				
+								  sumlen - buf_len);
 					if (err)
 						return err;
 				}
@@ -530,7 +533,7 @@ static int jffs2_scan_eraseblock (struct
 
 			if (buf_size && sumlen > buf_size)
 				kfree(sumptr);
-			/* If it returns with a real error, bail. 
+			/* If it returns with a real error, bail.
 			   If it returns positive, that's a block classification
 			   (i.e. BLK_STATE_xxx) so return that too.
 			   If it returns zero, fall through to full scan. */
@@ -551,6 +554,17 @@ static int jffs2_scan_eraseblock (struct
 			return err;
 	}
 
+	if ((buf[0] == 0xde) &&
+		(buf[1] == 0xad) &&
+		(buf[2] == 0xc0) &&
+		(buf[3] == 0xde)) {
+		/* end of filesystem. erase everything after this point */
+		printk("%s(): End of filesystem marker found at 0x%x\n", __func__, jeb->offset);
+		c->flags |= (1 << 7);
+
+		return BLK_STATE_ALLFF;
+	}
+
 	/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
 	ofs = 0;
 	max_ofs = EMPTY_SCAN_SIZE(c->sector_size);
@@ -676,7 +690,7 @@ scan_more:
 				scan_end = buf_len;
 				goto more_empty;
 			}
-			
+
 			/* See how much more there is to read in this eraseblock... */
 			buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
 			if (!buf_len) {
@@ -912,7 +926,7 @@ scan_more:
 
 	D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
 		  jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size));
-	
+
 	/* mark_node_obsolete can add to wasted !! */
 	if (jeb->wasted_size) {
 		jeb->dirty_size += jeb->wasted_size;