UBIFS: allow for sync_fs when read-only

sync_fs can be called even if the file system is mounted
read-only.  Ensure the commit is not run in that case.

Reported-by: Zoltan Sogor <weth@inf.u-szeged.hu>
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>

1 files changed, 10 insertions, 9 deletions

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 7e1f3efdf632..7fd759dde796 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -420,21 +420,22 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
         int i, ret = 0, err;
         long long bud_bytes;
 
-        if (c->jheads)
+        if (c->jheads) {
                 for (i = 0; i < c->jhead_cnt; i++) {
                         err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
                         if (err && !ret)
                                 ret = err;
                 }
 
-        /* Commit the journal unless it has too few data */
-        spin_lock(&c->buds_lock);
-        bud_bytes = c->bud_bytes;
-        spin_unlock(&c->buds_lock);
-        if (bud_bytes > c->leb_size) {
-                err = ubifs_run_commit(c);
-                if (err)
-                        return err;
+                /* Commit the journal unless it has too little data */
+                spin_lock(&c->buds_lock);
+                bud_bytes = c->bud_bytes;
+                spin_unlock(&c->buds_lock);
+                if (bud_bytes > c->leb_size) {
+                        err = ubifs_run_commit(c);
+                        if (err)
+                                return err;
+                }
         }
 
         /*