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qcow2-cache: Empty cache

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Add a function for emptying a cache, i.e., flushing it and marking all
elements invalid.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2013-09-03 10:09:51 +02:00 committed by Kevin Wolf
parent 6f176b48f9
commit e7108feaac
2 changed files with 20 additions and 0 deletions
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18
block/qcow2-cache.c
View File

@ -202,6 +202,24 @@ void qcow2_cache_depends_on_flush(Qcow2Cache *c)
c->depends_on_flush = true; c->depends_on_flush = true;
} }
int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c)
{
int ret, i;
ret = qcow2_cache_flush(bs, c);
if (ret < 0) {
return ret;
}
for (i = 0; i < c->size; i++) {
assert(c->entries[i].ref == 0);
c->entries[i].offset = 0;
c->entries[i].cache_hits = 0;
}
return 0;
}
static int qcow2_cache_find_entry_to_replace(Qcow2Cache *c) static int qcow2_cache_find_entry_to_replace(Qcow2Cache *c)
{ {
int i; int i;

2
block/qcow2.h
View File

@ -478,6 +478,8 @@ int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
Qcow2Cache *dependency); Qcow2Cache *dependency);
void qcow2_cache_depends_on_flush(Qcow2Cache *c); void qcow2_cache_depends_on_flush(Qcow2Cache *c);
int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
void **table); void **table);
int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,