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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
View file

@ -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) {

4
block/backup.c
View file

@ -289,14 +289,14 @@ static void coroutine_fn backup_run(void *opaque)
* backing file. */
for (i = 0; i < BACKUP_SECTORS_PER_CLUSTER;) {
/* bdrv_co_is_allocated() only returns true/false based
/* bdrv_is_allocated() only returns true/false based
* on the first set of sectors it comes across that
* are are all in the same state.
* For that reason we must verify each sector in the
* backup cluster length. We end up copying more than
* needed but at some point that is always the case. */
alloced =
bdrv_co_is_allocated(bs,
bdrv_is_allocated(bs,
start * BACKUP_SECTORS_PER_CLUSTER + i,
BACKUP_SECTORS_PER_CLUSTER - i, &n);
i += n;

2
block/raw_bsd.c
View file

@ -62,7 +62,7 @@ static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
int *pnum)
{
return bdrv_co_is_allocated(bs->file, sector_num, nb_sectors, pnum);
return bdrv_is_allocated(bs->file, sector_num, nb_sectors, pnum);
}
static int coroutine_fn raw_co_write_zeroes(BlockDriverState *bs,

4
block/stream.c
View file

@ -119,8 +119,8 @@ wait:
break;
}
ret = bdrv_co_is_allocated(bs, sector_num,
STREAM_BUFFER_SIZE / BDRV_SECTOR_SIZE, &n);
ret = bdrv_is_allocated(bs, sector_num,
STREAM_BUFFER_SIZE / BDRV_SECTOR_SIZE, &n);
if (ret == 1) {
/* Allocated in the top, no need to copy. */
copy = false;

2
include/block/block.h
View file

@ -179,8 +179,6 @@ int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
*/
int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
int nb_sectors);
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum);
int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
BlockDriverState *base,
int64_t sector_num,