[v2,2/3] Block layer uses modular thread pool

diff --git a/async.c b/async.c
index 5fb3fa6..e66f70f 100644
--- a/async.c
+++ b/async.c
@@ -232,10 +232,10 @@  GSource *aio_get_g_source(AioContext *ctx)
     return &ctx->source;
 }
 
-ThreadPool *aio_get_thread_pool(AioContext *ctx)
+ThreadPool *aio_get_thread_pool(AioContext *ctx, ThreadPoolFuncArr *tpf)
 {
     if (!ctx->thread_pool) {
-        ctx->thread_pool = thread_pool_new(ctx);
+        ctx->thread_pool = tpf->thread_pool_new(ctx);
     }
     return ctx->thread_pool;
 }
diff --git a/block/raw-posix.c b/block/raw-posix.c
index f6d48bb..f747301 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -142,6 +142,7 @@  typedef struct BDRVRawState {
     bool is_xfs : 1;
 #endif
     bool has_discard : 1;
+    ThreadPoolFuncArr *tpf;
 } BDRVRawState;
 
 typedef struct BDRVRawReopenState {
@@ -345,6 +346,9 @@  static int raw_open(BlockDriverState *bs, QDict *options, int flags,
     int ret;
 
     s->type = FTYPE_FILE;
+
+    s->tpf = thread_pool_probe();
+
     ret = raw_open_common(bs, options, flags, 0, &local_err);
     if (error_is_set(&local_err)) {
         error_propagate(errp, local_err);
@@ -792,6 +796,7 @@  static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque, int type)
 {
+    BDRVRawState *s = bs->opaque;
     RawPosixAIOData *acb = g_slice_new(RawPosixAIOData);
     ThreadPool *pool;
 
@@ -807,8 +812,8 @@  static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
     acb->aio_offset = sector_num * 512;
 
     trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
-    pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
-    return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
+    pool = aio_get_thread_pool(bdrv_get_aio_context(bs), s->tpf);
+    return s->tpf->thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
 }
 
 static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
@@ -874,6 +879,8 @@  static void raw_close(BlockDriverState *bs)
         qemu_close(s->fd);
         s->fd = -1;
     }
+
+    thread_pool_delete(s->tpf);
 }
 
 static int raw_truncate(BlockDriverState *bs, int64_t offset)
@@ -1490,8 +1497,8 @@  static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
     acb->aio_offset = 0;
     acb->aio_ioctl_buf = buf;
     acb->aio_ioctl_cmd = req;
-    pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
-    return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
+    pool = aio_get_thread_pool(bdrv_get_aio_context(bs), s->tpf);
+    return s->tpf->thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
 }
 
 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
diff --git a/block/raw-win32.c b/block/raw-win32.c
index 2741e4d..76df266 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -46,6 +46,7 @@  typedef struct RawWin32AIOData {
     size_t aio_nbytes;
     off64_t aio_offset;
     int aio_type;
+    ThreadPoolFuncArr *tpf;
 } RawWin32AIOData;
 
 typedef struct BDRVRawState {
@@ -159,8 +160,8 @@  static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
     acb->aio_offset = sector_num * 512;
 
     trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
-    pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
-    return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
+    pool = aio_get_thread_pool(bdrv_get_aio_context(bs), s->tpf);
+    return s->tpf->thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
 }
 
 int qemu_ftruncate64(int fd, int64_t length)
@@ -248,6 +249,8 @@  static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 
     s->type = FTYPE_FILE;
 
+    s->tpf = thread_pool_probe();
+
     opts = qemu_opts_create_nofail(&raw_runtime_opts);
     qemu_opts_absorb_qdict(opts, options, &local_err);
     if (error_is_set(&local_err)) {
@@ -339,6 +342,8 @@  static void raw_close(BlockDriverState *bs)
 {
     BDRVRawState *s = bs->opaque;
     CloseHandle(s->hfile);
+
+    thread_pool_delete(s->tpf);
 }
 
 static int raw_truncate(BlockDriverState *bs, int64_t offset)
diff --git a/include/block/aio.h b/include/block/aio.h
index 2efdf41..22d6fa0 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -231,7 +231,7 @@  void aio_set_event_notifier(AioContext *ctx,
 GSource *aio_get_g_source(AioContext *ctx);
 
 /* Return the ThreadPool bound to this AioContext */
-struct ThreadPool *aio_get_thread_pool(AioContext *ctx);
+struct ThreadPool *aio_get_thread_pool(AioContext *ctx, ThreadPoolFuncArr *tpf);
 
 /* Functions to operate on the main QEMU AioContext.  */
 
diff --git a/include/qemu-common.h b/include/qemu-common.h
index 5054836..594a53b 100644
--- a/include/qemu-common.h
+++ b/include/qemu-common.h
@@ -478,4 +478,6 @@  size_t buffer_find_nonzero_offset(const void *buf, size_t len);
  */
 int parse_debug_env(const char *name, int max, int initial);
 
+typedef struct ThreadPoolFuncArr ThreadPoolFuncArr;
+
 #endif