diff --git a/block.c b/block.c
index da1fdca..854ebd6 100644
--- a/block.c
+++ b/block.c
@@ -3521,7 +3521,7 @@ int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
 
 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
 {
-    acb->pool->cancel(acb);
+    acb->aiocb_info->cancel(acb);
 }
 
 /* block I/O throttling */
@@ -3711,7 +3711,7 @@ static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
     qemu_aio_release(acb);
 }
 
-static AIOPool bdrv_em_aio_pool = {
+static const AIOCBInfo bdrv_em_aiocb_info = {
     .aiocb_size         = sizeof(BlockDriverAIOCBSync),
     .cancel             = bdrv_aio_cancel_em,
 };
@@ -3740,7 +3740,7 @@ static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
 {
     BlockDriverAIOCBSync *acb;
 
-    acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque);
     acb->is_write = is_write;
     acb->qiov = qiov;
     acb->bounce = qemu_blockalign(bs, qiov->size);
@@ -3785,7 +3785,7 @@ static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb)
     qemu_aio_flush();
 }
 
-static AIOPool bdrv_em_co_aio_pool = {
+static const AIOCBInfo bdrv_em_co_aiocb_info = {
     .aiocb_size         = sizeof(BlockDriverAIOCBCoroutine),
     .cancel             = bdrv_aio_co_cancel_em,
 };
@@ -3828,7 +3828,7 @@ static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
     Coroutine *co;
     BlockDriverAIOCBCoroutine *acb;
 
-    acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque);
     acb->req.sector = sector_num;
     acb->req.nb_sectors = nb_sectors;
     acb->req.qiov = qiov;
@@ -3858,7 +3858,7 @@ BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
     Coroutine *co;
     BlockDriverAIOCBCoroutine *acb;
 
-    acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque);
     co = qemu_coroutine_create(bdrv_aio_flush_co_entry);
     qemu_coroutine_enter(co, acb);
 
@@ -3884,7 +3884,7 @@ BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 
     trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque);
 
-    acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque);
     acb->req.sector = sector_num;
     acb->req.nb_sectors = nb_sectors;
     co = qemu_coroutine_create(bdrv_aio_discard_co_entry);
@@ -3904,18 +3904,13 @@ void bdrv_init_with_whitelist(void)
     bdrv_init();
 }
 
-void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
+void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs,
                    BlockDriverCompletionFunc *cb, void *opaque)
 {
     BlockDriverAIOCB *acb;
 
-    if (pool->free_aiocb) {
-        acb = pool->free_aiocb;
-        pool->free_aiocb = acb->next;
-    } else {
-        acb = g_malloc0(pool->aiocb_size);
-        acb->pool = pool;
-    }
+    acb = g_slice_alloc(aiocb_info->aiocb_size);
+    acb->aiocb_info = aiocb_info;
     acb->bs = bs;
     acb->cb = cb;
     acb->opaque = opaque;
@@ -3924,10 +3919,8 @@ void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
 
 void qemu_aio_release(void *p)
 {
-    BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
-    AIOPool *pool = acb->pool;
-    acb->next = pool->free_aiocb;
-    pool->free_aiocb = acb;
+    BlockDriverAIOCB *acb = p;
+    g_slice_free1(acb->aiocb_info->aiocb_size, acb);
 }
 
 /**************************************************************/
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 1206d52..d61ece8 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -41,7 +41,7 @@ typedef struct BlkdebugAIOCB {
 
 static void blkdebug_aio_cancel(BlockDriverAIOCB *blockacb);
 
-static AIOPool blkdebug_aio_pool = {
+static const AIOCBInfo blkdebug_aiocb_info = {
     .aiocb_size = sizeof(BlkdebugAIOCB),
     .cancel     = blkdebug_aio_cancel,
 };
@@ -335,7 +335,7 @@ static BlockDriverAIOCB *inject_error(BlockDriverState *bs,
         return NULL;
     }
 
-    acb = qemu_aio_get(&blkdebug_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&blkdebug_aiocb_info, bs, cb, opaque);
     acb->ret = -error;
 
     bh = qemu_bh_new(error_callback_bh, acb);
diff --git a/block/blkverify.c b/block/blkverify.c
index 9d5f1ec..4beede7 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -48,7 +48,7 @@ static void blkverify_aio_cancel(BlockDriverAIOCB *blockacb)
     }
 }
 
-static AIOPool blkverify_aio_pool = {
+static const AIOCBInfo blkverify_aiocb_info = {
     .aiocb_size         = sizeof(BlkverifyAIOCB),
     .cancel             = blkverify_aio_cancel,
 };
@@ -233,7 +233,7 @@ static BlkverifyAIOCB *blkverify_aio_get(BlockDriverState *bs, bool is_write,
                                          BlockDriverCompletionFunc *cb,
                                          void *opaque)
 {
-    BlkverifyAIOCB *acb = qemu_aio_get(&blkverify_aio_pool, bs, cb, opaque);
+    BlkverifyAIOCB *acb = qemu_aio_get(&blkverify_aiocb_info, bs, cb, opaque);
 
     acb->bh = NULL;
     acb->is_write = is_write;
diff --git a/block/curl.c b/block/curl.c
index c1074cd..1179484 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -438,7 +438,7 @@ static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
     // Do we have to implement canceling? Seems to work without...
 }
 
-static AIOPool curl_aio_pool = {
+static const AIOCBInfo curl_aiocb_info = {
     .aiocb_size         = sizeof(CURLAIOCB),
     .cancel             = curl_aio_cancel,
 };
@@ -505,7 +505,7 @@ static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
 {
     CURLAIOCB *acb;
 
-    acb = qemu_aio_get(&curl_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
 
     acb->qiov = qiov;
     acb->sector_num = sector_num;
diff --git a/block/gluster.c b/block/gluster.c
index 3588d73..1c90174 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -388,7 +388,7 @@ static void qemu_gluster_aio_cancel(BlockDriverAIOCB *blockacb)
     }
 }
 
-static AIOPool gluster_aio_pool = {
+static const AIOCBInfo gluster_aiocb_info = {
     .aiocb_size = sizeof(GlusterAIOCB),
     .cancel = qemu_gluster_aio_cancel,
 };
@@ -439,7 +439,7 @@ static BlockDriverAIOCB *qemu_gluster_aio_rw(BlockDriverState *bs,
     size = nb_sectors * BDRV_SECTOR_SIZE;
     s->qemu_aio_count++;
 
-    acb = qemu_aio_get(&gluster_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&gluster_aiocb_info, bs, cb, opaque);
     acb->size = size;
     acb->ret = 0;
     acb->finished = NULL;
@@ -484,7 +484,7 @@ static BlockDriverAIOCB *qemu_gluster_aio_flush(BlockDriverState *bs,
     GlusterAIOCB *acb;
     BDRVGlusterState *s = bs->opaque;
 
-    acb = qemu_aio_get(&gluster_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&gluster_aiocb_info, bs, cb, opaque);
     acb->size = 0;
     acb->ret = 0;
     acb->finished = NULL;
diff --git a/block/iscsi.c b/block/iscsi.c
index d0b1a10..a6a819d 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -133,7 +133,7 @@ iscsi_aio_cancel(BlockDriverAIOCB *blockacb)
     }
 }
 
-static AIOPool iscsi_aio_pool = {
+static const AIOCBInfo iscsi_aiocb_info = {
     .aiocb_size         = sizeof(IscsiAIOCB),
     .cancel             = iscsi_aio_cancel,
 };
@@ -234,7 +234,7 @@ iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
     uint64_t lba;
     struct iscsi_data data;
 
-    acb = qemu_aio_get(&iscsi_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
     trace_iscsi_aio_writev(iscsi, sector_num, nb_sectors, opaque, acb);
 
     acb->iscsilun = iscsilun;
@@ -325,7 +325,7 @@ iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
 
     qemu_read_size = BDRV_SECTOR_SIZE * (size_t)nb_sectors;
 
-    acb = qemu_aio_get(&iscsi_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
     trace_iscsi_aio_readv(iscsi, sector_num, nb_sectors, opaque, acb);
 
     acb->iscsilun = iscsilun;
@@ -430,7 +430,7 @@ iscsi_aio_flush(BlockDriverState *bs,
     struct iscsi_context *iscsi = iscsilun->iscsi;
     IscsiAIOCB *acb;
 
-    acb = qemu_aio_get(&iscsi_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 
     acb->iscsilun = iscsilun;
     acb->canceled   = 0;
@@ -483,7 +483,7 @@ iscsi_aio_discard(BlockDriverState *bs,
     IscsiAIOCB *acb;
     struct unmap_list list[1];
 
-    acb = qemu_aio_get(&iscsi_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 
     acb->iscsilun = iscsilun;
     acb->canceled   = 0;
@@ -558,7 +558,7 @@ static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
 
     assert(req == SG_IO);
 
-    acb = qemu_aio_get(&iscsi_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 
     acb->iscsilun = iscsilun;
     acb->canceled    = 0;
diff --git a/block/linux-aio.c b/block/linux-aio.c
index 6ca984d..91ef863 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -140,7 +140,7 @@ static void laio_cancel(BlockDriverAIOCB *blockacb)
     }
 }
 
-static AIOPool laio_pool = {
+static const AIOCBInfo laio_aiocb_info = {
     .aiocb_size         = sizeof(struct qemu_laiocb),
     .cancel             = laio_cancel,
 };
@@ -154,7 +154,7 @@ BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
     struct iocb *iocbs;
     off_t offset = sector_num * 512;
 
-    laiocb = qemu_aio_get(&laio_pool, bs, cb, opaque);
+    laiocb = qemu_aio_get(&laio_aiocb_info, bs, cb, opaque);
     laiocb->nbytes = nb_sectors * 512;
     laiocb->ctx = s;
     laiocb->ret = -EINPROGRESS;
diff --git a/block/qed.c b/block/qed.c
index 6c182ca..0b5374a 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -30,7 +30,7 @@ static void qed_aio_cancel(BlockDriverAIOCB *blockacb)
     }
 }
 
-static AIOPool qed_aio_pool = {
+static const AIOCBInfo qed_aiocb_info = {
     .aiocb_size         = sizeof(QEDAIOCB),
     .cancel             = qed_aio_cancel,
 };
@@ -1311,7 +1311,7 @@ static BlockDriverAIOCB *qed_aio_setup(BlockDriverState *bs,
                                        BlockDriverCompletionFunc *cb,
                                        void *opaque, int flags)
 {
-    QEDAIOCB *acb = qemu_aio_get(&qed_aio_pool, bs, cb, opaque);
+    QEDAIOCB *acb = qemu_aio_get(&qed_aiocb_info, bs, cb, opaque);
 
     trace_qed_aio_setup(bs->opaque, acb, sector_num, nb_sectors,
                         opaque, flags);
diff --git a/block/rbd.c b/block/rbd.c
index 015a9db..0aaacaf 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -570,7 +570,7 @@ static void qemu_rbd_aio_cancel(BlockDriverAIOCB *blockacb)
     acb->cancelled = 1;
 }
 
-static AIOPool rbd_aio_pool = {
+static const AIOCBInfo rbd_aiocb_info = {
     .aiocb_size = sizeof(RBDAIOCB),
     .cancel = qemu_rbd_aio_cancel,
 };
@@ -672,7 +672,7 @@ static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
 
     BDRVRBDState *s = bs->opaque;
 
-    acb = qemu_aio_get(&rbd_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&rbd_aiocb_info, bs, cb, opaque);
     acb->cmd = cmd;
     acb->qiov = qiov;
     if (cmd == RBD_AIO_DISCARD) {
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 9306174..a48f58c 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -420,7 +420,7 @@ static void sd_aio_cancel(BlockDriverAIOCB *blockacb)
     acb->canceled = true;
 }
 
-static AIOPool sd_aio_pool = {
+static const AIOCBInfo sd_aiocb_info = {
     .aiocb_size = sizeof(SheepdogAIOCB),
     .cancel = sd_aio_cancel,
 };
@@ -431,7 +431,7 @@ static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
 {
     SheepdogAIOCB *acb;
 
-    acb = qemu_aio_get(&sd_aio_pool, bs, cb, opaque);
+    acb = qemu_aio_get(&sd_aiocb_info, bs, cb, opaque);
 
     acb->qiov = qiov;
 
diff --git a/block/win32-aio.c b/block/win32-aio.c
index c34dc73..444c228 100644
--- a/block/win32-aio.c
+++ b/block/win32-aio.c
@@ -131,7 +131,7 @@ static void win32_aio_cancel(BlockDriverAIOCB *blockacb)
     }
 }
 
-static AIOPool win32_aio_pool = {
+static const AIOCBInfo win32_aiocb_info = {
     .aiocb_size         = sizeof(QEMUWin32AIOCB),
     .cancel             = win32_aio_cancel,
 };
@@ -145,7 +145,7 @@ BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs,
     uint64_t offset = sector_num * 512;
     DWORD rc;
 
-    waiocb = qemu_aio_get(&win32_aio_pool, bs, cb, opaque);
+    waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque);
     waiocb->nbytes = nb_sectors * 512;
     waiocb->qiov = qiov;
     waiocb->is_read = (type == QEMU_AIO_READ);
diff --git a/dma-helpers.c b/dma-helpers.c
index 0c18e9e..4f5fb64 100644
--- a/dma-helpers.c
+++ b/dma-helpers.c
@@ -195,7 +195,7 @@ static void dma_aio_cancel(BlockDriverAIOCB *acb)
     dma_complete(dbs, 0);
 }
 
-static AIOPool dma_aio_pool = {
+static const AIOCBInfo dma_aiocb_info = {
     .aiocb_size         = sizeof(DMAAIOCB),
     .cancel             = dma_aio_cancel,
 };
@@ -205,7 +205,7 @@ BlockDriverAIOCB *dma_bdrv_io(
     DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
     void *opaque, DMADirection dir)
 {
-    DMAAIOCB *dbs = qemu_aio_get(&dma_aio_pool, bs, cb, opaque);
+    DMAAIOCB *dbs = qemu_aio_get(&dma_aiocb_info, bs, cb, opaque);
 
     trace_dma_bdrv_io(dbs, bs, sector_num, (dir == DMA_DIRECTION_TO_DEVICE));
 
diff --git a/hw/ide/core.c b/hw/ide/core.c
index d683a8c..7d6b0fa 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -336,7 +336,7 @@ static void trim_aio_cancel(BlockDriverAIOCB *acb)
     qemu_aio_release(iocb);
 }
 
-static AIOPool trim_aio_pool = {
+static const AIOCBInfo trim_aiocb_info = {
     .aiocb_size         = sizeof(TrimAIOCB),
     .cancel             = trim_aio_cancel,
 };
@@ -360,7 +360,7 @@ BlockDriverAIOCB *ide_issue_trim(BlockDriverState *bs,
     TrimAIOCB *iocb;
     int i, j, ret;
 
-    iocb = qemu_aio_get(&trim_aio_pool, bs, cb, opaque);
+    iocb = qemu_aio_get(&trim_aiocb_info, bs, cb, opaque);
     iocb->bh = qemu_bh_new(ide_trim_bh_cb, iocb);
     iocb->ret = 0;
 
diff --git a/qemu-aio.h b/qemu-aio.h
index 1b7eb6e..a29264b 100644
--- a/qemu-aio.h
+++ b/qemu-aio.h
@@ -20,22 +20,21 @@
 
 typedef struct BlockDriverAIOCB BlockDriverAIOCB;
 typedef void BlockDriverCompletionFunc(void *opaque, int ret);
+typedef void BlockDriverCancelFunc(BlockDriverAIOCB *acb);
 
-typedef struct AIOPool {
-    void (*cancel)(BlockDriverAIOCB *acb);
-    int aiocb_size;
-    BlockDriverAIOCB *free_aiocb;
-} AIOPool;
+typedef struct AIOCBInfo {
+    size_t aiocb_size;
+    BlockDriverCancelFunc *cancel;
+} AIOCBInfo;
 
 struct BlockDriverAIOCB {
-    AIOPool *pool;
+    const AIOCBInfo *aiocb_info;
     BlockDriverState *bs;
     BlockDriverCompletionFunc *cb;
     void *opaque;
-    BlockDriverAIOCB *next;
 };
 
-void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
+void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs,
                    BlockDriverCompletionFunc *cb, void *opaque);
 void qemu_aio_release(void *p);
 
diff --git a/thread-pool.c b/thread-pool.c
index 266f12f..894cde6 100644
--- a/thread-pool.c
+++ b/thread-pool.c
@@ -206,7 +206,7 @@ static void thread_pool_cancel(BlockDriverAIOCB *acb)
     qemu_mutex_unlock(&lock);
 }
 
-static AIOPool thread_pool_cb_pool = {
+static const AIOCBInfo thread_pool_aiocb_info = {
     .aiocb_size         = sizeof(ThreadPoolElement),
     .cancel             = thread_pool_cancel,
 };
@@ -216,7 +216,7 @@ BlockDriverAIOCB *thread_pool_submit_aio(ThreadPoolFunc *func, void *arg,
 {
     ThreadPoolElement *req;
 
-    req = qemu_aio_get(&thread_pool_cb_pool, NULL, cb, opaque);
+    req = qemu_aio_get(&thread_pool_aiocb_info, NULL, cb, opaque);
     req->func = func;
     req->arg = arg;
     req->state = THREAD_QUEUED;
