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block: make bdrv_co_is_allocated static

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bdrv_is_allocated can detect coroutine context and go through a fast
path, similar to other block layer functions.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-09-04 19:00:22 +02:00 • committed by Stefan Hajnoczi
parent df2a6f29a5
commit bdad13b9de
5 changed files with 20 additions and 16 deletions
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24
block.c
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@ -2587,7 +2587,7 @@ static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
if (flags & BDRV_REQ_COPY_ON_READ) {
int pnum;
ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum);
ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum);
if (ret < 0) {
goto out;
}
@ -3061,8 +3061,9 @@ typedef struct BdrvCoIsAllocatedData {
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
* beyond the end of the disk image it will be clamped.
*/
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum)
static int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum)
{
int64_t n;
@ -3112,10 +3113,15 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
.done = false,
};
co = qemu_coroutine_create(bdrv_is_allocated_co_entry);
qemu_coroutine_enter(co, &data);
while (!data.done) {
qemu_aio_wait();
if (qemu_in_coroutine()) {
/* Fast-path if already in coroutine context */
bdrv_is_allocated_co_entry(&data);
} else {
co = qemu_coroutine_create(bdrv_is_allocated_co_entry);
qemu_coroutine_enter(co, &data);
while (!data.done) {
qemu_aio_wait();
}
}
return data.ret;
}
@ -3143,8 +3149,8 @@ int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
intermediate = top;
while (intermediate && intermediate != base) {
int pnum_inter;
ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors,
&pnum_inter);
ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors,
&pnum_inter);
if (ret < 0) {
return ret;
} else if (ret) {