diff options
Diffstat (limited to 'block/qcow2-refcount.c')
| -rw-r--r-- | block/qcow2-refcount.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index 4c1794f9af..22cadd79d5 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -29,6 +29,7 @@ #include "qemu/range.h" #include "qemu/bswap.h" #include "qemu/cutils.h" +#include "trace.h" static int64_t alloc_clusters_noref(BlockDriverState *bs, uint64_t size, uint64_t max); @@ -737,7 +738,11 @@ void qcow2_process_discards(BlockDriverState *bs, int ret) /* Discard is optional, ignore the return value */ if (ret >= 0) { - bdrv_pdiscard(bs->file, d->offset, d->bytes); + int r2 = bdrv_pdiscard(bs->file, d->offset, d->bytes); + if (r2 < 0) { + trace_qcow2_process_discards_failed_region(d->offset, d->bytes, + r2); + } } g_free(d); @@ -3444,3 +3449,35 @@ int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size) "There are no references in the refcount table."); return -EIO; } + +int qcow2_detect_metadata_preallocation(BlockDriverState *bs) +{ + BDRVQcow2State *s = bs->opaque; + int64_t i, end_cluster, cluster_count = 0, threshold; + int64_t file_length, real_allocation, real_clusters; + + file_length = bdrv_getlength(bs->file->bs); + if (file_length < 0) { + return file_length; + } + + real_allocation = bdrv_get_allocated_file_size(bs->file->bs); + if (real_allocation < 0) { + return real_allocation; + } + + real_clusters = real_allocation / s->cluster_size; + threshold = MAX(real_clusters * 10 / 9, real_clusters + 2); + + end_cluster = size_to_clusters(s, file_length); + for (i = 0; i < end_cluster && cluster_count < threshold; i++) { + uint64_t refcount; + int ret = qcow2_get_refcount(bs, i, &refcount); + if (ret < 0) { + return ret; + } + cluster_count += !!refcount; + } + + return cluster_count >= threshold; +} |