[Qemu-devel] [PATCH v2 5/5] block: use QSLIST for the AIO free list

[Paolo Bonzini <pbonzini@redhat.com>]

QSLIST is equivalent to an open-coded free list, use it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block.c     |    9 ++++-----
 block_int.h |    4 ++--
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/block.c b/block.c
index 3f072f6..acb54b1 100644
--- a/block.c
+++ b/block.c
@@ -3242,9 +3242,9 @@ void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
 {
     BlockDriverAIOCB *acb;
 
-    if (pool->free_aiocb) {
-        acb = pool->free_aiocb;
-        pool->free_aiocb = acb->next;
+    if (!QSLIST_EMPTY(pool->free_aiocb)) {
+        acb = QSLIST_FIRST(pool->free_aiocb);
+        QSLIST_REMOVE_HEAD(pool->free_aiocb, next);
     } else {
         acb = g_malloc0(pool->aiocb_size);
         acb->pool = pool;
@@ -3259,8 +3259,7 @@ void qemu_aio_release(void *p)
 {
     BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
     AIOPool *pool = acb->pool;
-    acb->next = pool->free_aiocb;
-    pool->free_aiocb = acb;
+    QSLIST_INSERT_HEAD(pool->free_aiocb, acb, next);
 }
 
 /**************************************************************/
diff --git a/block_int.h b/block_int.h
index 311bd2a..c592e54 100644
--- a/block_int.h
+++ b/block_int.h
@@ -56,7 +56,7 @@ typedef struct BdrvTrackedRequest BdrvTrackedRequest;
 typedef struct AIOPool {
     void (*cancel)(BlockDriverAIOCB *acb);
     int aiocb_size;
-    BlockDriverAIOCB *free_aiocb;
+    QSLIST_HEAD(, BlockDriverAIOCB) *free_aiocb;
 } AIOPool;
 
 typedef struct BlockIOLimit {
@@ -268,7 +268,7 @@ struct BlockDriverAIOCB {
     BlockDriverState *bs;
     BlockDriverCompletionFunc *cb;
     void *opaque;
-    BlockDriverAIOCB *next;
+    QSLIST_ENTRY(BlockDriverAIOCB) next;
 };
 
 void get_tmp_filename(char *filename, int size);
-- 
1.7.7.1