UBIFS: always commit in sync_fs

Always run commit in sync_fs, because even if the journal seems
to be almost empty, there may be a deletion which removes a large
file, which affects the index greatly. And because we want
better free space predictions after 'sync_fs()', we have to
commit.

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

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 4713017..ee8e774 100644 (file)
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -429,9 +429,8 @@ static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt)
 
 static int ubifs_sync_fs(struct super_block *sb, int wait)
 {
+       int i, err;
        struct ubifs_info *c = sb->s_fs_info;
-       int i, ret = 0, err;
-       long long bud_bytes;
        struct writeback_control wbc = {
                .sync_mode   = wait ? WB_SYNC_ALL : WB_SYNC_HOLD,
                .range_start = 0,
@@ -439,6 +438,19 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
                .nr_to_write = LONG_MAX,
        };
 
+       if (sb->s_flags & MS_RDONLY)
+               return 0;
+
+       /*
+        * Synchronize write buffers, because 'ubifs_run_commit()' does not
+        * do this if it waits for an already running commit.
+        */
+       for (i = 0; i < c->jhead_cnt; i++) {
+               err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
+               if (err)
+                       return err;
+       }
+
        /*
         * VFS calls '->sync_fs()' before synchronizing all dirty inodes and
         * pages, so synchronize them first, then commit the journal. Strictly
@@ -450,30 +462,16 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
         */
        generic_sync_sb_inodes(sb, &wbc);
 
-       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 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;
-               }
-       }
+       err = ubifs_run_commit(c);
+       if (err)
+               return err;
 
        /*
         * We ought to call sync for c->ubi but it does not have one. If it had
         * it would in turn call mtd->sync, however mtd operations are
         * synchronous anyway, so we don't lose any sleep here.
         */
-       return ret;
+       return err;
 }
 
 /**