ref: e299c8d66002d6b9c8d77b3c6c3247e0915fd8c6
parent: 85a64ca0685fe854e830c0b25565e5ca015d2dd3
author: ngkaho1234 <ngkaho1234@gmail.com>
date: Tue Dec 15 18:31:29 EST 2015
ext4_blockdev: add ext4_block_cache_flush routine.
--- a/lwext4/ext4_blockdev.c
+++ b/lwext4/ext4_blockdev.c
@@ -140,7 +140,7 @@
{int r;
struct ext4_bcache *bc = bdev->bc;
- /*Only flushing unreferenced buffer is allowed.*/
+ /*Only flushing data in an unreferenced buffer is allowed.*/
ext4_assert(!buf->refctr);
if (ext4_bcache_test_flag(buf, BC_DIRTY)) {@@ -409,11 +409,22 @@
return r;
}
-int ext4_block_cache_write_back(struct ext4_blockdev *bdev, uint8_t on_off)
+int ext4_block_cache_flush(struct ext4_blockdev *bdev)
{- int r;
- struct ext4_buf *buf;
+ while (!SLIST_EMPTY(&bdev->bc->dirty_list)) {+ int r;
+ struct ext4_buf *buf = SLIST_FIRST(&bdev->bc->dirty_list);
+ ext4_assert(buf);
+ r = ext4_block_flush_buf(bdev, buf);
+ if (r != EOK)
+ return r;
+ }
+ return EOK;
+}
+
+int ext4_block_cache_write_back(struct ext4_blockdev *bdev, uint8_t on_off)
+{if (on_off)
bdev->cache_write_back++;
@@ -423,17 +434,8 @@
if (bdev->cache_write_back)
return EOK;
- /*Flush all delayed cache blocks*/
- while (!SLIST_EMPTY(&bdev->bc->dirty_list)) {-
- buf = SLIST_FIRST(&bdev->bc->dirty_list);
- ext4_assert(buf);
- r = ext4_block_flush_buf(bdev, buf);
- if (r != EOK)
- return r;
-
- }
- return EOK;
+ /*Flush data in all delayed cache blocks*/
+ return ext4_block_cache_flush(bdev);
}
/**
--- a/lwext4/ext4_blockdev.h
+++ b/lwext4/ext4_blockdev.h
@@ -231,6 +231,11 @@
int ext4_block_readbytes(struct ext4_blockdev *bdev, uint64_t off, void *buf,
uint32_t len);
+/**@brief Flush all dirty buffers to disk
+ * @param bdev block device descriptor
+ * @return standard error code*/
+int ext4_block_cache_flush(struct ext4_blockdev *bdev);
+
/**@brief Enable/disable write back cache mode
* @param bdev block device descriptor
* @param on_off