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| author | Pavel Butsykin <pbutsykin@virtuozzo.com> | 2017-09-18 15:42:28 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2017-09-26 15:00:32 +0200 |
| commit | f71c08ea8e60f035485a512fd2af8908567592f0 (patch) | |
| tree | a3ef8dc5e1f34e1a18d755672029bced057885ba /block/qcow2.h | |
| parent | 4ffca8904a350460cdaa6304ea8c9b9c693d2d91 (diff) | |
| download | qemu-f71c08ea8e60f035485a512fd2af8908567592f0.tar.gz | |
qcow2: add qcow2_cache_discard
Whenever l2/refcount table clusters are discarded from the file we can
automatically drop unnecessary content of the cache tables. This reduces
the chance of eviction useful cache data and eliminates inconsistent data
in the cache with the data in the file.
Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20170918124230.8152-3-pbutsykin@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/qcow2.h')
| -rw-r--r-- | block/qcow2.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index 96a8d43c17..52c374e9ed 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -649,6 +649,9 @@ int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, void **table); void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table); +void *qcow2_cache_is_table_offset(BlockDriverState *bs, Qcow2Cache *c, + uint64_t offset); +void qcow2_cache_discard(BlockDriverState *bs, Qcow2Cache *c, void *table); /* qcow2-bitmap.c functions */ int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res, |