Remove aio_ctx from paio_* interface

The context parameter in paio_submit isn't used anyway, so there is no reason
why block drivers should need to remember it. This also avoids passing a Linux
AIO context to paio_submit (which doesn't do any harm as long as the parameter
is unused, but it is highly confusing).
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

block/raw-posix-aio.h

@@ -26,8 +26,8 @@
 
 
 /* posix-aio-compat.c - thread pool based implementation */
-void *paio_init(void);
-BlockDriverAIOCB *paio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
+int paio_init(void);
+BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque, int type);
 BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,

block/raw-posix.c

@@ -107,7 +107,6 @@ typedef struct BDRVRawState {
     int type;
     unsigned int lseek_err_cnt;
     int open_flags;
-    void *aio_ctx;
 #if defined(__linux__)
     /* linux floppy specific */
     int64_t fd_open_time;
@@ -117,6 +116,7 @@ typedef struct BDRVRawState {
 #endif
 #ifdef CONFIG_LINUX_AIO
     int use_aio;
+    void *aio_ctx;
 #endif
     uint8_t* aligned_buf;
 } BDRVRawState;
@@ -185,8 +185,7 @@ static int raw_open_common(BlockDriverState *bs, const char *filename,
     } else
 #endif
     {
-        s->aio_ctx = paio_init();
-        if (!s->aio_ctx) {
+        if (paio_init() < 0) {
             goto out_free_buf;
         }
 #ifdef CONFIG_LINUX_AIO
@@ -558,7 +557,7 @@ static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
         }
     }
 
-    return paio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov, nb_sectors,
+    return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
                        cb, opaque, type);
 }
 
@@ -586,8 +585,7 @@ static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
     if (fd_open(bs) < 0)
         return NULL;
 
-    return paio_submit(bs, s->aio_ctx, s->fd, 0, NULL, 0,
-    		       cb, opaque, QEMU_AIO_FLUSH);
+    return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 }
 
 static void raw_close(BlockDriverState *bs)

posix-aio-compat.c

@@ -556,7 +556,7 @@ static AIOPool raw_aio_pool = {
     .cancel             = paio_cancel,
 };
 
-BlockDriverAIOCB *paio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
+BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque, int type)
 {
@@ -607,7 +607,7 @@ BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
     return &acb->common;
 }
 
-void *paio_init(void)
+int paio_init(void)
 {
     struct sigaction act;
     PosixAioState *s;
@@ -615,7 +615,7 @@ void *paio_init(void)
     int ret;
 
     if (posix_aio_state)
-        return posix_aio_state;
+        return 0;
 
     s = qemu_malloc(sizeof(PosixAioState));
 
@@ -627,7 +627,7 @@ void *paio_init(void)
     s->first_aio = NULL;
     if (pipe(fds) == -1) {
         fprintf(stderr, "failed to create pipe\n");
-        return NULL;
+        return -1;
     }
 
     s->rfd = fds[0];
@@ -650,6 +650,5 @@ void *paio_init(void)
     QTAILQ_INIT(&request_list);
 
     posix_aio_state = s;
-
-    return posix_aio_state;
+    return 0;
 }