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qcow/qcow2: Allocate QCowAIOCB structure using stack 

instead of calling qemi_aio_get use stack

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Frediano Ziglio 2011-08-23 15:21:08 +02:00 committed by Kevin Wolf
parent e4ea78ee76
commit f5cd8173e7
2 changed files with 27 additions and 63 deletions
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52
block/qcow.c
View File

@ -505,28 +505,12 @@ typedef struct QCowAIOCB {
BlockDriverAIOCB *hd_aiocb;
} QCowAIOCB;
static void qcow_aio_cancel(BlockDriverAIOCB *blockacb)
{
QCowAIOCB *acb = container_of(blockacb, QCowAIOCB, common);
if (acb->hd_aiocb)
bdrv_aio_cancel(acb->hd_aiocb);
qemu_aio_release(acb);
}
static AIOPool qcow_aio_pool = {
.aiocb_size = sizeof(QCowAIOCB),
.cancel = qcow_aio_cancel,
};
static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
int is_write)
int is_write, QCowAIOCB *acb)
{
QCowAIOCB *acb;
acb = qemu_aio_get(&qcow_aio_pool, bs, NULL, NULL);
if (!acb)
return NULL;
memset(acb, 0, sizeof(*acb));
acb->common.bs = bs;
acb->hd_aiocb = NULL;
acb->sector_num = sector_num;
acb->qiov = qiov;
@ -545,9 +529,8 @@ static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
return acb;
}
static int qcow_aio_read_cb(void *opaque)
static int qcow_aio_read_cb(QCowAIOCB *acb)
{
QCowAIOCB *acb = opaque;
BlockDriverState *bs = acb->common.bs;
BDRVQcowState *s = bs->opaque;
int index_in_cluster;
@ -636,29 +619,27 @@ static int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{
BDRVQcowState *s = bs->opaque;
QCowAIOCB *acb;
QCowAIOCB acb;
int ret;
acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, 0);
qcow_aio_setup(bs, sector_num, qiov, nb_sectors, 0, &acb);
qemu_co_mutex_lock(&s->lock);
do {
ret = qcow_aio_read_cb(acb);
ret = qcow_aio_read_cb(&acb);
} while (ret > 0);
qemu_co_mutex_unlock(&s->lock);
if (acb->qiov->niov > 1) {
qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size);
qemu_vfree(acb->orig_buf);
if (acb.qiov->niov > 1) {
qemu_iovec_from_buffer(acb.qiov, acb.orig_buf, acb.qiov->size);
qemu_vfree(acb.orig_buf);
}
qemu_aio_release(acb);
return ret;
}
static int qcow_aio_write_cb(void *opaque)
static int qcow_aio_write_cb(QCowAIOCB *acb)
{
QCowAIOCB *acb = opaque;
BlockDriverState *bs = acb->common.bs;
BDRVQcowState *s = bs->opaque;
int index_in_cluster;
@ -716,23 +697,22 @@ static int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{
BDRVQcowState *s = bs->opaque;
QCowAIOCB *acb;
QCowAIOCB acb;
int ret;
s->cluster_cache_offset = -1; /* disable compressed cache */
acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, 1);
qcow_aio_setup(bs, sector_num, qiov, nb_sectors, 1, &acb);
qemu_co_mutex_lock(&s->lock);
do {
ret = qcow_aio_write_cb(acb);
ret = qcow_aio_write_cb(&acb);
} while (ret > 0);
qemu_co_mutex_unlock(&s->lock);
if (acb->qiov->niov > 1) {
qemu_vfree(acb->orig_buf);
if (acb.qiov->niov > 1) {
qemu_vfree(acb.orig_buf);
}
qemu_aio_release(acb);
return ret;
}

38
block/qcow2.c
View File

@ -392,17 +392,6 @@ typedef struct QCowAIOCB {
QLIST_ENTRY(QCowAIOCB) next_depend;
} QCowAIOCB;
static void qcow2_aio_cancel(BlockDriverAIOCB *blockacb)
{
QCowAIOCB *acb = container_of(blockacb, QCowAIOCB, common);
qemu_aio_release(acb);
}
static AIOPool qcow2_aio_pool = {
.aiocb_size = sizeof(QCowAIOCB),
.cancel = qcow2_aio_cancel,
};
/*
* Returns 0 when the request is completed successfully, 1 when there is still
* a part left to do and -errno in error cases.
@ -532,13 +521,10 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
static QCowAIOCB *qcow2_aio_setup(BlockDriverState *bs, int64_t sector_num,
QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb,
void *opaque, int is_write)
void *opaque, int is_write, QCowAIOCB *acb)
{
QCowAIOCB *acb;
acb = qemu_aio_get(&qcow2_aio_pool, bs, cb, opaque);
if (!acb)
return NULL;
memset(acb, 0, sizeof(*acb));
acb->common.bs = bs;
acb->sector_num = sector_num;
acb->qiov = qiov;
acb->is_write = is_write;
@ -558,19 +544,18 @@ static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{
BDRVQcowState *s = bs->opaque;
QCowAIOCB *acb;
QCowAIOCB acb;
int ret;
acb = qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, 0);
qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, 0, &acb);
qemu_co_mutex_lock(&s->lock);
do {
ret = qcow2_aio_read_cb(acb);
ret = qcow2_aio_read_cb(&acb);
} while (ret > 0);
qemu_co_mutex_unlock(&s->lock);
qemu_iovec_destroy(&acb->hd_qiov);
qemu_aio_release(acb);
qemu_iovec_destroy(&acb.hd_qiov);
return ret;
}
@ -674,20 +659,19 @@ static int qcow2_co_writev(BlockDriverState *bs,
QEMUIOVector *qiov)
{
BDRVQcowState *s = bs->opaque;
QCowAIOCB *acb;
QCowAIOCB acb;
int ret;
acb = qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, 1);
qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, 1, &acb);
s->cluster_cache_offset = -1; /* disable compressed cache */
qemu_co_mutex_lock(&s->lock);
do {
ret = qcow2_aio_write_cb(acb);
ret = qcow2_aio_write_cb(&acb);
} while (ret > 0);
qemu_co_mutex_unlock(&s->lock);
qemu_iovec_destroy(&acb->hd_qiov);
qemu_aio_release(acb);
qemu_iovec_destroy(&acb.hd_qiov);
return ret;
}