shithub: lwext4

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ext4_bcache: add new flag BC_FLUSH.

--- a/lwext4/ext4_bcache.c

+++ b/lwext4/ext4_bcache.c

@@ -233,10 +233,13 @@

 		RB_INSERT(ext4_buf_lru, &bc->lru_root, buf);

 		/* This buffer is ready to be flushed. */

 		if (ext4_bcache_test_flag(buf, BC_DIRTY)) {

-			if (bc->bdev->cache_write_back)

+			if (bc->bdev->cache_write_back &&

+			    !ext4_bcache_test_flag(buf, BC_FLUSH))

 				ext4_bcache_insert_dirty_node(bc, buf);

-			else

+			else {

 				ext4_block_flush_buf(bc->bdev, buf);

+				ext4_bcache_clear_flag(buf, BC_FLUSH);

+			}

 		}

 		/* The buffer is invalidated...drop it. */

--- a/lwext4/ext4_bcache.h

+++ b/lwext4/ext4_bcache.h

@@ -142,9 +142,17 @@

 	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)    \