UBIFS: introduce a "grouped" journal head flag

Journal heads are different in a way how UBIFS writes nodes there. All normal
journal heads receive grouped nodes, while the GC journal heads receives
ungrouped nodes. This patch adds a 'grouped' flag to 'struct ubifs_jhead' which
describes this property.

This patch is a preparation to a further recovery fix.

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

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 1ab0d22..1e40db7 100644 (file)
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -811,15 +811,18 @@ static int alloc_wbufs(struct ubifs_info *c)
 
                c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
                c->jheads[i].wbuf.jhead = i;
+               c->jheads[i].grouped = 1;
        }
 
        c->jheads[BASEHD].wbuf.dtype = UBI_SHORTTERM;
        /*
         * Garbage Collector head likely contains long-term data and
-        * does not need to be synchronized by timer.
+        * does not need to be synchronized by timer. Also GC head nodes are
+        * not grouped.
         */
        c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM;
        c->jheads[GCHD].wbuf.no_timer = 1;
+       c->jheads[GCHD].grouped = 0;
 
        return 0;
 }

diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index a70d7b4..adeca14 100644 (file)
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -722,12 +722,14 @@ struct ubifs_bud {
  * struct ubifs_jhead - journal head.
  * @wbuf: head's write-buffer
  * @buds_list: list of bud LEBs belonging to this journal head
+ * @grouped: non-zero if UBIFS groups nodes when writing to this journal head
  *
  * Note, the @buds list is protected by the @c->buds_lock.
  */
 struct ubifs_jhead {
        struct ubifs_wbuf wbuf;
        struct list_head buds_list;
+       unsigned int grouped:1;
 };
 
 /**