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-rw-r--r--common/block.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/common/block.c b/common/block.c
index 35173c65f1..3a031a4fc7 100644
--- a/common/block.c
+++ b/common/block.c
@@ -38,6 +38,11 @@ struct chunk {
#define BUFSIZE (PAGE_SIZE * 4)
+static int writebuffer_io_len(struct block_device *blk, struct chunk *chunk)
+{
+ return min(blk->rdbufsize, blk->num_blocks - chunk->block_start);
+}
+
/*
* Write all dirty chunks back to the device
*/
@@ -51,7 +56,9 @@ static int writebuffer_flush(struct block_device *blk)
list_for_each_entry(chunk, &blk->buffered_blocks, list) {
if (chunk->dirty) {
- ret = blk->ops->write(blk, chunk->data, chunk->block_start, blk->rdbufsize);
+ ret = blk->ops->write(blk, chunk->data,
+ chunk->block_start,
+ writebuffer_io_len(blk, chunk));
if (ret < 0)
return ret;
@@ -118,10 +125,9 @@ static struct chunk *get_chunk(struct block_device *blk)
/* use last entry which is the most unused */
chunk = list_last_entry(&blk->buffered_blocks, struct chunk, list);
if (chunk->dirty) {
- size_t num_blocks = min(blk->rdbufsize,
- blk->num_blocks - chunk->block_start);
- ret = blk->ops->write(blk, chunk->data, chunk->block_start,
- num_blocks);
+ ret = blk->ops->write(blk, chunk->data,
+ chunk->block_start,
+ writebuffer_io_len(blk, chunk));
if (ret < 0)
return ERR_PTR(ret);
@@ -145,7 +151,6 @@ static struct chunk *get_chunk(struct block_device *blk)
static int block_cache(struct block_device *blk, int block)
{
struct chunk *chunk;
- size_t num_blocks;
int ret;
chunk = get_chunk(blk);
@@ -157,9 +162,8 @@ static int block_cache(struct block_device *blk, int block)
dev_dbg(blk->dev, "%s: %d to %d\n", __func__, chunk->block_start,
chunk->num);
- num_blocks = min(blk->rdbufsize, blk->num_blocks - chunk->block_start);
-
- ret = blk->ops->read(blk, chunk->data, chunk->block_start, num_blocks);
+ ret = blk->ops->read(blk, chunk->data, chunk->block_start,
+ writebuffer_io_len(blk, chunk));
if (ret) {
list_add_tail(&chunk->list, &blk->idle_blocks);
return ret;