UBIFS: improve error messages

Ricard complaints that the following error message is odd:

"UBIFS error (pid 1578): validate_sb: bad superblock, error 8"

and he is right. This patch improves the error messages a bit and makes
them more user-friendly.

Reported-by: Ricard Wanderlof <ricard.wanderlof@axis.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 14 insertions, 5 deletions

diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 6094c5a5d7a8..771f7fb6ce92 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -410,13 +410,23 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
         }
 
         if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
-                err = 7;
+                ubifs_err("too few main LEBs count %d, must be at least %d",
+                          c->main_lebs, UBIFS_MIN_MAIN_LEBS);
                 goto failed;
         }
 
-        if (c->max_bud_bytes < (long long)c->leb_size * UBIFS_MIN_BUD_LEBS ||
-            c->max_bud_bytes > (long long)c->leb_size * c->main_lebs) {
-                err = 8;
+        max_bytes = (long long)c->leb_size * UBIFS_MIN_BUD_LEBS;
+        if (c->max_bud_bytes < max_bytes) {
+                ubifs_err("too small journal (%lld bytes), must be at least "
+                          "%lld bytes",  c->max_bud_bytes, max_bytes);
+                goto failed;
+        }
+
+        max_bytes = (long long)c->leb_size * c->main_lebs;
+        if (c->max_bud_bytes > max_bytes) {
+                ubifs_err("too large journal size (%lld bytes), only %lld bytes"
+                          "available in the main area",
+                          c->max_bud_bytes, max_bytes);
                 goto failed;
         }
 
@@ -450,7 +460,6 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
                 goto failed;
         }
 
-        max_bytes = c->main_lebs * (long long)c->leb_size;
         if (c->rp_size < 0 || max_bytes < c->rp_size) {
                 err = 14;
                 goto failed;