Commit e7108fea authored by Max Reitz's avatar Max Reitz Committed by Kevin Wolf
Browse files

qcow2-cache: Empty cache 



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

Signed-off-by: default avatarMax Reitz <mreitz@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 6f176b48

block/qcow2-cache.c

+18 −0
Original line number Diff line number Diff line
@@ -202,6 +202,24 @@ void qcow2_cache_depends_on_flush(Qcow2Cache *c) 
    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)

{

    int i;

block/qcow2.h

+2 −0
Original line number Diff line number Diff line
@@ -478,6 +478,8 @@ int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c, 
    Qcow2Cache *dependency);

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,

    void **table);

int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,