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block: return get_block_status data and flags for formats

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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 19:00:30 +02:00 • committed by Stefan Hajnoczi
parent 4333bb7140
commit 4bc74be997
8 changed files with 94 additions and 19 deletions
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35
block/qed.c
View file

@ -652,16 +652,36 @@ static int bdrv_qed_create(const char *filename, QEMUOptionParameter *options)
}
typedef struct {
BlockDriverState *bs;
Coroutine *co;
int is_allocated;
uint64_t pos;
int64_t status;
int *pnum;
} QEDIsAllocatedCB;
static void qed_is_allocated_cb(void *opaque, int ret, uint64_t offset, size_t len)
{
QEDIsAllocatedCB *cb = opaque;
BDRVQEDState *s = cb->bs->opaque;
*cb->pnum = len / BDRV_SECTOR_SIZE;
cb->is_allocated = (ret == QED_CLUSTER_FOUND || ret == QED_CLUSTER_ZERO);
switch (ret) {
case QED_CLUSTER_FOUND:
offset |= qed_offset_into_cluster(s, cb->pos);
cb->status = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
break;
case QED_CLUSTER_ZERO:
cb->status = BDRV_BLOCK_ZERO;
break;
case QED_CLUSTER_L2:
case QED_CLUSTER_L1:
cb->status = 0;
break;
default:
assert(ret < 0);
cb->status = ret;
break;
}
if (cb->co) {
qemu_coroutine_enter(cb->co, NULL);
}
@ -672,25 +692,26 @@ static int64_t coroutine_fn bdrv_qed_co_get_block_status(BlockDriverState *bs,
int nb_sectors, int *pnum)
{
BDRVQEDState *s = bs->opaque;
uint64_t pos = (uint64_t)sector_num * BDRV_SECTOR_SIZE;
size_t len = (size_t)nb_sectors * BDRV_SECTOR_SIZE;
QEDIsAllocatedCB cb = {
.is_allocated = -1,
.bs = bs,
.pos = (uint64_t)sector_num * BDRV_SECTOR_SIZE,
.status = BDRV_BLOCK_OFFSET_MASK,
.pnum = pnum,
};
QEDRequest request = { .l2_table = NULL };
qed_find_cluster(s, &request, pos, len, qed_is_allocated_cb, &cb);
qed_find_cluster(s, &request, cb.pos, len, qed_is_allocated_cb, &cb);
/* Now sleep if the callback wasn't invoked immediately */
while (cb.is_allocated == -1) {
while (cb.status == BDRV_BLOCK_OFFSET_MASK) {
cb.co = qemu_coroutine_self();
qemu_coroutine_yield();
}
qed_unref_l2_cache_entry(request.l2_table);
return cb.is_allocated;
return cb.status;
}
static int bdrv_qed_make_empty(BlockDriverState *bs)