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Refactor aio callback allocation to use an aiocb pool (Avi Kivity)

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Move the AIOCB allocation code to use a dedicate structure, AIOPool.  AIOCB
specific information, such as the AIOCB size and cancellation routine, is
moved into the pool.

At present, there is exactly one pool per block format driver, maintaining
the status quo.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6870 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-03-20 18:25:59 +00:00
parent 97b83deb55
commit 6bbff9a0b4
2 changed files with 40 additions and 16 deletions
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42
block.c
View File

@ -147,6 +147,7 @@ static void bdrv_register(BlockDriver *bdrv)
bdrv->bdrv_read = bdrv_read_em;
bdrv->bdrv_write = bdrv_write_em;
}
aio_pool_init(&bdrv->aio_pool, bdrv->aiocb_size, bdrv->bdrv_aio_cancel);
bdrv->next = first_drv;
first_drv = bdrv;
}
@ -1371,14 +1372,12 @@ BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
{
BlockDriver *drv = acb->bs->drv;
if (acb->cb == bdrv_aio_rw_vector_cb) {
VectorTranslationState *s = acb->opaque;
acb = s->aiocb;
}
drv->bdrv_aio_cancel(acb);
acb->pool->cancel(acb);
}
@ -1496,18 +1495,25 @@ void bdrv_init(void)
bdrv_register(&bdrv_nbd);
}
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
void *opaque)
void aio_pool_init(AIOPool *pool, int aiocb_size,
void (*cancel)(BlockDriverAIOCB *acb))
{
pool->aiocb_size = aiocb_size;
pool->cancel = cancel;
pool->free_aiocb = NULL;
}
void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
BlockDriver *drv;
BlockDriverAIOCB *acb;
drv = bs->drv;
if (drv->free_aiocb) {
acb = drv->free_aiocb;
drv->free_aiocb = acb->next;
if (pool->free_aiocb) {
acb = pool->free_aiocb;
pool->free_aiocb = acb->next;
} else {
acb = qemu_mallocz(drv->aiocb_size);
acb = qemu_mallocz(pool->aiocb_size);
acb->pool = pool;
}
acb->bs = bs;
acb->cb = cb;
@ -1515,12 +1521,18 @@ void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
return acb;
}
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
void *opaque)
{
return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
}
void qemu_aio_release(void *p)
{
BlockDriverAIOCB *acb = p;
BlockDriver *drv = acb->bs->drv;
acb->next = drv->free_aiocb;
drv->free_aiocb = acb;
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
AIOPool *pool = acb->pool;
acb->next = pool->free_aiocb;
pool->free_aiocb = acb;
}
/**************************************************************/

14
block_int.h
View File

@ -30,6 +30,12 @@
#define BLOCK_FLAG_COMPRESS 2
#define BLOCK_FLAG_COMPAT6 4
typedef struct AIOPool {
void (*cancel)(BlockDriverAIOCB *acb);
int aiocb_size;
BlockDriverAIOCB *free_aiocb;
} AIOPool;
struct BlockDriver {
const char *format_name;
int instance_size;
@ -91,7 +97,7 @@ struct BlockDriver {
BlockDriverCompletionFunc *cb,
void *opaque);
BlockDriverAIOCB *free_aiocb;
AIOPool aio_pool;
struct BlockDriver *next;
};
@ -141,6 +147,7 @@ struct BlockDriverState {
};
struct BlockDriverAIOCB {
AIOPool *pool;
BlockDriverState *bs;
BlockDriverCompletionFunc *cb;
void *opaque;
@ -149,8 +156,13 @@ struct BlockDriverAIOCB {
void get_tmp_filename(char *filename, int size);
void aio_pool_init(AIOPool *pool, int aiocb_size,
void (*cancel)(BlockDriverAIOCB *acb));
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
void *opaque);
void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque);
void qemu_aio_release(void *p);
extern BlockDriverState *bdrv_first;