shithub: lwext4

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ext4_bcache: add BC_TMP flag.

--- a/lwext4/ext4_bcache.c

+++ b/lwext4/ext4_bcache.c

@@ -290,7 +290,8 @@

 		}

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

-		if (!ext4_bcache_test_flag(buf, BC_UPTODATE))

+		if (!ext4_bcache_test_flag(buf, BC_UPTODATE) ||

+		    ext4_bcache_test_flag(buf, BC_TMP))

 			ext4_bcache_drop_buf(bc, buf);

 	}

--- a/lwext4/ext4_bcache.h

+++ b/lwext4/ext4_bcache.h

@@ -151,11 +151,14 @@

  *  - BC_DIRTY: Buffer is dirty.

  *  - BC_FLUSH: Buffer will be immediately flushed,

  *              when no one references it.

+ *  - BC_TMP: Buffer will be dropped once its refctr

+ *            reaches zero.

  */

 enum bcache_state_bits {

 	BC_UPTODATE,

 	BC_DIRTY,

-	BC_FLUSH

+	BC_FLUSH,

+	BC_TMP

 };

 #define ext4_bcache_set_flag(buf, b)    \

--- a/lwext4/ext4_journal.c

+++ b/lwext4/ext4_journal.c

@@ -280,8 +280,12 @@

 	/* If succeeded, mark buffer as BC_FLUSH to indicate

 	 * that data should be written to disk immediately.*/

-	if (rc == EOK)

+	if (rc == EOK) {

 		ext4_bcache_set_flag(block->buf, BC_FLUSH);

+		/* As we don't want to occupy too much space

+		 * in block cache, we set this buffer BC_TMP.*/

+		ext4_bcache_set_flag(block->buf, BC_TMP);

+	}

 	return rc;

 }