X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=lwext4%2Fext4_bcache.h;h=938f13bb3f0191bb5fc922e196c458fe63d06035;hb=b8f9e381ce116851390ed96570bcbfdd4af29438;hp=c718a1134f51a4cc72e6ec1db2b59179ac7f028e;hpb=f7eb061d6c5e916767b66d952993bbb66d0fc8f7;p=lwext4.git

diff --git a/lwext4/ext4_bcache.h b/lwext4/ext4_bcache.h
index c718a11..938f13b 100644
--- 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 = {                                   \