[Qemu-devel] [PATCH 03/14] block: qemu_aio_get does not return NULL

[Kevin Wolf <kwolf@redhat.com>]

From: Paolo Bonzini <pbonzini@redhat.com>

Initially done with the following semantic patch:

@ rule1 @
expression E;
statement S;
@@
  E = qemu_aio_get (...);
(
- if (E == NULL) { ... }
|
- if (E)
    { <... S ...> }
)

which however missed occurrences in linux-aio.c and posix-aio-compat.c.
Those were done by hand.

The change in vdi_aio_setup's caller was also done by hand.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/curl.c       |    4 ----
 block/rbd.c        |    3 ---
 block/vdi.c        |   46 ++++++++++++++++++----------------------------
 linux-aio.c        |    2 --
 posix-aio-compat.c |    4 ----
 5 files changed, 18 insertions(+), 41 deletions(-)

diff --git a/block/curl.c b/block/curl.c
index 4209ac8..e9102e3 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -509,10 +509,6 @@ static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
 
     acb = qemu_aio_get(&curl_aio_pool, bs, cb, opaque);
 
-    if (!acb) {
-        return NULL;
-    }
-
     acb->qiov = qiov;
     acb->sector_num = sector_num;
     acb->nb_sectors = nb_sectors;
diff --git a/block/rbd.c b/block/rbd.c
index 9088c52..312584a 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -632,9 +632,6 @@ static BlockDriverAIOCB *rbd_aio_rw_vector(BlockDriverState *bs,
     BDRVRBDState *s = bs->opaque;
 
     acb = qemu_aio_get(&rbd_aio_pool, bs, cb, opaque);
-    if (!acb) {
-        return NULL;
-    }
     acb->write = write;
     acb->qiov = qiov;
     acb->bounce = qemu_blockalign(bs, qiov->size);
diff --git a/block/vdi.c b/block/vdi.c
index 6bb43b8..31cdfab 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -515,28 +515,26 @@ static VdiAIOCB *vdi_aio_setup(BlockDriverState *bs, int64_t sector_num,
            bs, sector_num, qiov, nb_sectors, cb, opaque, is_write);
 
     acb = qemu_aio_get(&vdi_aio_pool, bs, cb, opaque);
-    if (acb) {
-        acb->hd_aiocb = NULL;
-        acb->sector_num = sector_num;
-        acb->qiov = qiov;
-        acb->is_write = is_write;
-
-        if (qiov->niov > 1) {
-            acb->buf = qemu_blockalign(bs, qiov->size);
-            acb->orig_buf = acb->buf;
-            if (is_write) {
-                qemu_iovec_to_buffer(qiov, acb->buf);
-            }
-        } else {
-            acb->buf = (uint8_t *)qiov->iov->iov_base;
+    acb->hd_aiocb = NULL;
+    acb->sector_num = sector_num;
+    acb->qiov = qiov;
+    acb->is_write = is_write;
+
+    if (qiov->niov > 1) {
+        acb->buf = qemu_blockalign(bs, qiov->size);
+        acb->orig_buf = acb->buf;
+        if (is_write) {
+            qemu_iovec_to_buffer(qiov, acb->buf);
         }
-        acb->nb_sectors = nb_sectors;
-        acb->n_sectors = 0;
-        acb->bmap_first = VDI_UNALLOCATED;
-        acb->bmap_last = VDI_UNALLOCATED;
-        acb->block_buffer = NULL;
-        acb->header_modified = 0;
-    }
+    } else {
+        acb->buf = (uint8_t *)qiov->iov->iov_base;
+    }
+    acb->nb_sectors = nb_sectors;
+    acb->n_sectors = 0;
+    acb->bmap_first = VDI_UNALLOCATED;
+    acb->bmap_last = VDI_UNALLOCATED;
+    acb->block_buffer = NULL;
+    acb->header_modified = 0;
     return acb;
 }
 
@@ -653,10 +651,6 @@ static BlockDriverAIOCB *vdi_aio_readv(BlockDriverState *bs,
 
     logout("\n");
     acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
-    if (!acb) {
-        return NULL;
-    }
-
     ret = vdi_schedule_bh(vdi_aio_rw_bh, acb);
     if (ret < 0) {
         if (acb->qiov->niov > 1) {
@@ -807,10 +801,6 @@ static BlockDriverAIOCB *vdi_aio_writev(BlockDriverState *bs,
 
     logout("\n");
     acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
-    if (!acb) {
-        return NULL;
-    }
-
     ret = vdi_schedule_bh(vdi_aio_rw_bh, acb);
     if (ret < 0) {
         if (acb->qiov->niov > 1) {
diff --git a/linux-aio.c b/linux-aio.c
index 1c635ef..d2fc2e7 100644
--- a/linux-aio.c
+++ b/linux-aio.c
@@ -166,8 +166,6 @@ BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
     off_t offset = sector_num * 512;
 
     laiocb = qemu_aio_get(&laio_pool, bs, cb, opaque);
-    if (!laiocb)
-        return NULL;
     laiocb->nbytes = nb_sectors * 512;
     laiocb->ctx = s;
     laiocb->ret = -EINPROGRESS;
diff --git a/posix-aio-compat.c b/posix-aio-compat.c
index c380ec1..cccb673 100644
--- a/posix-aio-compat.c
+++ b/posix-aio-compat.c
@@ -611,8 +611,6 @@ BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
     struct qemu_paiocb *acb;
 
     acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque);
-    if (!acb)
-        return NULL;
     acb->aio_type = type;
     acb->aio_fildes = fd;
 
@@ -638,8 +636,6 @@ BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
     struct qemu_paiocb *acb;
 
     acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque);
-    if (!acb)
-        return NULL;
     acb->aio_type = QEMU_AIO_IOCTL;
     acb->aio_fildes = fd;
     acb->aio_offset = 0;
-- 
1.7.6.4