UBIFS: do not print scary error messages needlessly

At the moment UBIFS print large and scary error messages and
flash dumps in case of nearly any corruption, even if it is
a recoverable corruption. For example, if the master node is
corrupted, ubifs_scan() prints error dumps, then UBIFS recovers
just fine and goes on.

This patch makes UBIFS print scary error messages only in
real cases, which are not recoverable. It adds 'quiet' argument
to the 'ubifs_scan()' function, so the caller may ask 'ubi_scan()'
not to print error messages if the caller is able to do recovery.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Reviewed-by: Adrian Hunter <Adrian.Hunter@nokia.com>

1 files changed, 22 insertions, 10 deletions

diff --git a/fs/ubifs/scan.c b/fs/ubifs/scan.c
index 892ebfee4fe5..96c525384191 100644
--- a/fs/ubifs/scan.c
+++ b/fs/ubifs/scan.c
@@ -108,10 +108,9 @@ int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
 
                 /* Make the node pads to 8-byte boundary */
                 if ((node_len + pad_len) & 7) {
-                        if (!quiet) {
+                        if (!quiet)
                                 dbg_err("bad padding length %d - %d",
                                         offs, offs + node_len + pad_len);
-                        }
                         return SCANNED_A_BAD_PAD_NODE;
                 }
 
@@ -253,15 +252,19 @@ void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs,
  * @c: UBIFS file-system description object
  * @lnum: logical eraseblock number
  * @offs: offset to start at (usually zero)
- * @sbuf: scan buffer (must be c->leb_size)
+ * @sbuf: scan buffer (must be of @c->leb_size bytes in size)
+ * @quiet: print no messages
  *
  * This function scans LEB number @lnum and returns complete information about
  * its contents. Returns the scaned information in case of success and,
  * %-EUCLEAN if the LEB neads recovery, and other negative error codes in case
  * of failure.
+ *
+ * If @quiet is non-zero, this function does not print large and scary
+ * error messages and flash dumps in case of errors.
  */
 struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
-                                  int offs, void *sbuf)
+                                  int offs, void *sbuf, int quiet)
 {
         void *buf = sbuf + offs;
         int err, len = c->leb_size - offs;
@@ -280,7 +283,7 @@ struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
 
                 cond_resched();
 
-                ret = ubifs_scan_a_node(c, buf, len, lnum, offs, 0);
+                ret = ubifs_scan_a_node(c, buf, len, lnum, offs, quiet);
                 if (ret > 0) {
                         /* Padding bytes or a valid padding node */
                         offs += ret;
@@ -320,7 +323,9 @@ struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
         }
 
         if (offs % c->min_io_size) {
-                ubifs_err("empty space starts at non-aligned offset %d", offs);
+                if (!quiet)
+                        ubifs_err("empty space starts at non-aligned offset %d",
+                                  offs);
                 goto corrupted;;
         }
 
@@ -331,18 +336,25 @@ struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
                         break;
         for (; len; offs++, buf++, len--)
                 if (*(uint8_t *)buf != 0xff) {
-                        ubifs_err("corrupt empty space at LEB %d:%d",
-                                  lnum, offs);
+                        if (!quiet)
+                                ubifs_err("corrupt empty space at LEB %d:%d",
+                                          lnum, offs);
                         goto corrupted;
                 }
 
         return sleb;
 
 corrupted:
-        ubifs_scanned_corruption(c, lnum, offs, buf);
+        if (!quiet) {
+                ubifs_scanned_corruption(c, lnum, offs, buf);
+                ubifs_err("LEB %d scanning failed", lnum);
+        }
         err = -EUCLEAN;
+        ubifs_scan_destroy(sleb);
+        return ERR_PTR(err);
+
 error:
-        ubifs_err("LEB %d scanning failed", lnum);
+        ubifs_err("LEB %d scanning failed, error %d", lnum, err);
         ubifs_scan_destroy(sleb);
         return ERR_PTR(err);
 }