ext4_journal: forcibly flush data to disk when stop journalling.

[lwext4.git] / lwext4 / ext4_bcache.h

diff --git a/lwext4/ext4_bcache.h b/lwext4/ext4_bcache.h
index c718a1134f51a4cc72e6ec1db2b59179ac7f028e..938f13bb3f0191bb5fc922e196c458fe63d06035 100644 (file)
--- a/lwext4/ext4_bcache.h
+++ b/lwext4/ext4_bcache.h
@@ -49,16 +49,10 @@ extern "C" {
 #include "queue.h"
 
 #define EXT4_BLOCK_ZERO()      \
-       {.uptodate = 0, .dirty = 0, .lb_id = 0, .data = 0}
+       {.lb_id = 0, .data = 0}
 
 /**@brief   Single block descriptor*/
 struct ext4_block {
-       /**@brief   Uptodate flag*/
-       bool uptodate;
-
-       /**@brief   Dirty flag*/
-       bool dirty;
-
        /**@brief   Logical block ID*/
        uint64_t lb_id;
 
@@ -148,9 +142,17 @@ struct ext4_bcache {
        SLIST_HEAD(ext4_buf_dirty, ext4_buf) dirty_list;
 };
 
+/**@brief buffer state bits
+ *
+ *  - BC♡UPTODATE: Buffer contains valid data.
+ *  - BC_DIRTY: Buffer is dirty.
+ *  - BC_FLUSH: Buffer will be immediately flushed,
+ *              when no one references it.
+ */
 enum bcache_state_bits {
        BC_UPTODATE,
-       BC_DIRTY
+       BC_DIRTY,
+       BC_FLUSH
 };
 
 #define ext4_bcache_set_flag(buf, b)    \
@@ -162,6 +164,22 @@ enum bcache_state_bits {
 #define ext4_bcache_test_flag(buf, b)    \
        (((buf)->flags & (1 << (b))) >> (b))
 
+static inline void ext4_bcache_set_dirty(struct ext4_buf *buf) {
+       ext4_bcache_set_flag(buf, BC_UPTODATE);
+       ext4_bcache_set_flag(buf, BC_DIRTY);
+}
+
+static inline void ext4_bcache_clear_dirty(struct ext4_buf *buf) {
+       ext4_bcache_clear_flag(buf, BC_UPTODATE);
+       ext4_bcache_clear_flag(buf, BC_DIRTY);
+}
+
+/**@brief   Increment reference counter of buf by 1.*/
+#define ext4_bcache_inc_ref(buf) ((buf)->refctr++)
+
+/**@brief   Decrement reference counter of buf by 1.*/
+#define ext4_bcache_dec_ref(buf) ((buf)->refctr--)
+
 /**@brief   Static initializer of block cache structure.*/
 #define EXT4_BCACHE_STATIC_INSTANCE(__name, __cnt, __itemsize)                 \
        static struct ext4_bcache __name = {                                   \