1 files changed, 33 insertions, 24 deletions

diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index 805605250f1..e5f6cf8a115 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -53,6 +53,25 @@ static int is_empty(void *buf, int len)
 }
 
 /**
+ * first_non_ff - find offset of the first non-0xff byte.
+ * @buf: buffer to search in
+ * @len: length of buffer
+ *
+ * This function returns offset of the first non-0xff byte in @buf or %-1 if
+ * the buffer contains only 0xff bytes.
+ */
+static int first_non_ff(void *buf, int len)
+{
+	uint8_t *p = buf;
+	int i;
+
+	for (i = 0; i < len; i++)
+		if (*p++ != 0xff)
+			return i;
+	return -1;
+}
+
+/**
  * get_master_node - get the last valid master node allowing for corruption.
  * @c: UBIFS file-system description object
  * @lnum: LEB number
@@ -357,11 +376,7 @@ static int is_last_write(const struct ubifs_info *c, void *buf, int offs)
 	empty_offs = ALIGN(offs + 1, c->min_io_size);
 	check_len = c->leb_size - empty_offs;
 	p = buf + empty_offs - offs;
-
-	for (; check_len > 0; check_len--)
-		if (*p++ != 0xff)
-			return 0;
-	return 1;
+	return is_empty(p, check_len);
 }
 
 /**
@@ -543,8 +558,8 @@ static int drop_incomplete_group(struct ubifs_scan_leb *sleb, int *offs)
  *
  * This function does a scan of a LEB, but caters for errors that might have
  * been caused by the unclean unmount from which we are attempting to recover.
- *
- * This function returns %0 on success and a negative error code on failure.
+ * Returns %0 in case of success, %-EUCLEAN if an unrecoverable corruption is
+ * found, and a negative error code in case of failure.
  */
 struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
 					 int offs, void *sbuf, int grouped)
@@ -643,7 +658,8 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
 			goto corrupted;
 		default:
 			dbg_err("unknown");
-			goto corrupted;
+			err = -EINVAL;
+			goto error;
 		}
 	}
 
@@ -652,8 +668,13 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
 			clean_buf(c, &buf, lnum, &offs, &len);
 			need_clean = 1;
 		} else {
-			ubifs_err("corrupt empty space at LEB %d:%d",
-				  lnum, offs);
+			int corruption = first_non_ff(buf, len);
+
+			ubifs_err("corrupt empty space LEB %d:%d, corruption "
+				  "starts at %d", lnum, offs, corruption);
+			/* Make sure we dump interesting non-0xFF data */
+			offs = corruption;
+			buf += corruption;
 			goto corrupted;
 		}
 	}
@@ -813,7 +834,7 @@ struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum,
 static int recover_head(const struct ubifs_info *c, int lnum, int offs,
 			void *sbuf)
 {
-	int len, err, need_clean = 0;
+	int len, err;
 
 	if (c->min_io_size > 1)
 		len = c->min_io_size;
@@ -827,19 +848,7 @@ static int recover_head(const struct ubifs_info *c, int lnum, int offs,
 
 	/* Read at the head location and check it is empty flash */
 	err = ubi_read(c->ubi, lnum, sbuf, offs, len);
-	if (err)
-		need_clean = 1;
-	else {
-		uint8_t *p = sbuf;
-
-		while (len--)
-			if (*p++ != 0xff) {
-				need_clean = 1;
-				break;
-			}
-	}
-
-	if (need_clean) {
+	if (err || !is_empty(sbuf, len)) {
 		dbg_rcvry("cleaning head at %d:%d", lnum, offs);
 		if (offs == 0)
 			return ubifs_leb_unmap(c, lnum);