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authorPaolo Bonzini <pbonzini@redhat.com>2017-02-13 14:52:27 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2017-02-21 11:14:08 +0000
commitb20123a28b18568cb6a40680e15821fdb171a8bf (patch)
tree0a7338cb9092b81722d670e8ccb51763217a6b36
parente5c67ab552fb056827b5b40356c0ef235e975e7e (diff)
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qed: introduce qed_aio_start_io and qed_aio_next_io_cb
qed_aio_start_io and qed_aio_next_io will not have to acquire/release the AioContext, while qed_aio_next_io_cb will. Split the functionality and gain a little type-safety in the process. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170213135235.12274-11-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
-rw-r--r--block/qed.c39
1 files changed, 25 insertions, 14 deletions
diff --git a/block/qed.c b/block/qed.c
index 1a7ef0a..7f1c508 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -273,7 +273,19 @@ static CachedL2Table *qed_new_l2_table(BDRVQEDState *s)
return l2_table;
}
-static void qed_aio_next_io(void *opaque, int ret);
+static void qed_aio_next_io(QEDAIOCB *acb, int ret);
+
+static void qed_aio_start_io(QEDAIOCB *acb)
+{
+ qed_aio_next_io(acb, 0);
+}
+
+static void qed_aio_next_io_cb(void *opaque, int ret)
+{
+ QEDAIOCB *acb = opaque;
+
+ qed_aio_next_io(acb, ret);
+}
static void qed_plug_allocating_write_reqs(BDRVQEDState *s)
{
@@ -292,7 +304,7 @@ static void qed_unplug_allocating_write_reqs(BDRVQEDState *s)
acb = QSIMPLEQ_FIRST(&s->allocating_write_reqs);
if (acb) {
- qed_aio_next_io(acb, 0);
+ qed_aio_start_io(acb);
}
}
@@ -959,7 +971,7 @@ static void qed_aio_complete(QEDAIOCB *acb, int ret)
QSIMPLEQ_REMOVE_HEAD(&s->allocating_write_reqs, next);
acb = QSIMPLEQ_FIRST(&s->allocating_write_reqs);
if (acb) {
- qed_aio_next_io(acb, 0);
+ qed_aio_start_io(acb);
} else if (s->header.features & QED_F_NEED_CHECK) {
qed_start_need_check_timer(s);
}
@@ -984,7 +996,7 @@ static void qed_commit_l2_update(void *opaque, int ret)
acb->request.l2_table = qed_find_l2_cache_entry(&s->l2_cache, l2_offset);
assert(acb->request.l2_table != NULL);
- qed_aio_next_io(opaque, ret);
+ qed_aio_next_io(acb, ret);
}
/**
@@ -1032,11 +1044,11 @@ static void qed_aio_write_l2_update(QEDAIOCB *acb, int ret, uint64_t offset)
if (need_alloc) {
/* Write out the whole new L2 table */
qed_write_l2_table(s, &acb->request, 0, s->table_nelems, true,
- qed_aio_write_l1_update, acb);
+ qed_aio_write_l1_update, acb);
} else {
/* Write out only the updated part of the L2 table */
qed_write_l2_table(s, &acb->request, index, acb->cur_nclusters, false,
- qed_aio_next_io, acb);
+ qed_aio_next_io_cb, acb);
}
return;
@@ -1088,7 +1100,7 @@ static void qed_aio_write_main(void *opaque, int ret)
}
if (acb->find_cluster_ret == QED_CLUSTER_FOUND) {
- next_fn = qed_aio_next_io;
+ next_fn = qed_aio_next_io_cb;
} else {
if (s->bs->backing) {
next_fn = qed_aio_write_flush_before_l2_update;
@@ -1201,7 +1213,7 @@ static void qed_aio_write_alloc(QEDAIOCB *acb, size_t len)
if (acb->flags & QED_AIOCB_ZERO) {
/* Skip ahead if the clusters are already zero */
if (acb->find_cluster_ret == QED_CLUSTER_ZERO) {
- qed_aio_next_io(acb, 0);
+ qed_aio_start_io(acb);
return;
}
@@ -1321,18 +1333,18 @@ static void qed_aio_read_data(void *opaque, int ret,
/* Handle zero cluster and backing file reads */
if (ret == QED_CLUSTER_ZERO) {
qemu_iovec_memset(&acb->cur_qiov, 0, 0, acb->cur_qiov.size);
- qed_aio_next_io(acb, 0);
+ qed_aio_start_io(acb);
return;
} else if (ret != QED_CLUSTER_FOUND) {
qed_read_backing_file(s, acb->cur_pos, &acb->cur_qiov,
- &acb->backing_qiov, qed_aio_next_io, acb);
+ &acb->backing_qiov, qed_aio_next_io_cb, acb);
return;
}
BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
bdrv_aio_readv(bs->file, offset / BDRV_SECTOR_SIZE,
&acb->cur_qiov, acb->cur_qiov.size / BDRV_SECTOR_SIZE,
- qed_aio_next_io, acb);
+ qed_aio_next_io_cb, acb);
return;
err:
@@ -1342,9 +1354,8 @@ err:
/**
* Begin next I/O or complete the request
*/
-static void qed_aio_next_io(void *opaque, int ret)
+static void qed_aio_next_io(QEDAIOCB *acb, int ret)
{
- QEDAIOCB *acb = opaque;
BDRVQEDState *s = acb_to_s(acb);
QEDFindClusterFunc *io_fn = (acb->flags & QED_AIOCB_WRITE) ?
qed_aio_write_data : qed_aio_read_data;
@@ -1400,7 +1411,7 @@ static BlockAIOCB *qed_aio_setup(BlockDriverState *bs,
qemu_iovec_init(&acb->cur_qiov, qiov->niov);
/* Start request */
- qed_aio_next_io(acb, 0);
+ qed_aio_start_io(acb);
return &acb->common;
}