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block: Switch BlockRequest to byte-based 

BlockRequest is the internal struct used by bdrv_aio_*.  At the
moment, all such calls were sector-based, but we will eventually
convert to byte-based; start by changing the internal variables
to be byte-based.  No change to behavior, although the read and
write code can now go byte-based through more of the stack.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-id: 1468624988-423-4-git-send-email-eblake@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Eric Blake 2016-07-15 17:22:52 -06:00 committed by Stefan Hajnoczi
parent 0c51a893b6
commit b15404e027
1 changed files with 30 additions and 32 deletions
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62
block/io.c
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@ -33,14 +33,13 @@
#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */
static BlockAIOCB *bdrv_co_aio_rw_vector(BdrvChild *child,
int64_t sector_num,
QEMUIOVector *qiov,
int nb_sectors,
BdrvRequestFlags flags,
BlockCompletionFunc *cb,
void *opaque,
bool is_write);
static BlockAIOCB *bdrv_co_aio_prw_vector(BdrvChild *child,
int64_t offset,
QEMUIOVector *qiov,
BdrvRequestFlags flags,
BlockCompletionFunc *cb,
void *opaque,
bool is_write);
static void coroutine_fn bdrv_co_do_rw(void *opaque);
static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
int64_t offset, int count, BdrvRequestFlags flags);
@ -2015,8 +2014,9 @@ BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num,
{
trace_bdrv_aio_readv(child->bs, sector_num, nb_sectors, opaque);
return bdrv_co_aio_rw_vector(child, sector_num, qiov, nb_sectors, 0,
cb, opaque, false);
assert(nb_sectors << BDRV_SECTOR_BITS == qiov->size);
return bdrv_co_aio_prw_vector(child, sector_num << BDRV_SECTOR_BITS, qiov,
0, cb, opaque, false);
}
BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num,
@ -2025,8 +2025,9 @@ BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num,
{
trace_bdrv_aio_writev(child->bs, sector_num, nb_sectors, opaque);
return bdrv_co_aio_rw_vector(child, sector_num, qiov, nb_sectors, 0,
cb, opaque, true);
assert(nb_sectors << BDRV_SECTOR_BITS == qiov->size);
return bdrv_co_aio_prw_vector(child, sector_num << BDRV_SECTOR_BITS, qiov,
0, cb, opaque, true);
}
void bdrv_aio_cancel(BlockAIOCB *acb)
@ -2062,8 +2063,8 @@ typedef struct BlockRequest {
union {
/* Used during read, write, trim */
struct {
int64_t sector;
int nb_sectors;
int64_t offset;
int bytes;
int flags;
QEMUIOVector *qiov;
};
@ -2127,24 +2128,23 @@ static void coroutine_fn bdrv_co_do_rw(void *opaque)
BlockAIOCBCoroutine *acb = opaque;
if (!acb->is_write) {
acb->req.error = bdrv_co_do_readv(acb->child, acb->req.sector,
acb->req.nb_sectors, acb->req.qiov, acb->req.flags);
acb->req.error = bdrv_co_preadv(acb->child, acb->req.offset,
acb->req.qiov->size, acb->req.qiov, acb->req.flags);
} else {
acb->req.error = bdrv_co_do_writev(acb->child, acb->req.sector,
acb->req.nb_sectors, acb->req.qiov, acb->req.flags);
acb->req.error = bdrv_co_pwritev(acb->child, acb->req.offset,
acb->req.qiov->size, acb->req.qiov, acb->req.flags);
}
bdrv_co_complete(acb);
}
static BlockAIOCB *bdrv_co_aio_rw_vector(BdrvChild *child,
int64_t sector_num,
QEMUIOVector *qiov,
int nb_sectors,
BdrvRequestFlags flags,
BlockCompletionFunc *cb,
void *opaque,
bool is_write)
static BlockAIOCB *bdrv_co_aio_prw_vector(BdrvChild *child,
int64_t offset,
QEMUIOVector *qiov,
BdrvRequestFlags flags,
BlockCompletionFunc *cb,
void *opaque,
bool is_write)
{
Coroutine *co;
BlockAIOCBCoroutine *acb;
@ -2153,8 +2153,7 @@ static BlockAIOCB *bdrv_co_aio_rw_vector(BdrvChild *child,
acb->child = child;
acb->need_bh = true;
acb->req.error = -EINPROGRESS;
acb->req.sector = sector_num;
acb->req.nb_sectors = nb_sectors;
acb->req.offset = offset;
acb->req.qiov = qiov;
acb->req.flags = flags;
acb->is_write = is_write;
@ -2199,8 +2198,7 @@ static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque)
BlockAIOCBCoroutine *acb = opaque;
BlockDriverState *bs = acb->common.bs;
acb->req.error = bdrv_co_pdiscard(bs, acb->req.sector << BDRV_SECTOR_BITS,
acb->req.nb_sectors << BDRV_SECTOR_BITS);
acb->req.error = bdrv_co_pdiscard(bs, acb->req.offset, acb->req.bytes);
bdrv_co_complete(acb);
}
@ -2216,8 +2214,8 @@ BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque);
acb->need_bh = true;
acb->req.error = -EINPROGRESS;
acb->req.sector = sector_num;
acb->req.nb_sectors = nb_sectors;
acb->req.offset = sector_num << BDRV_SECTOR_BITS;
acb->req.bytes = nb_sectors << BDRV_SECTOR_BITS;
co = qemu_coroutine_create(bdrv_aio_discard_co_entry, acb);
qemu_coroutine_enter(co);