Message ID | 1408725104-17176-6-git-send-email-mreitz@redhat.com |
---|---|
State | New |
Headers | show |
On Fri, Aug 22, 2014 at 06:31:39PM +0200, Max Reitz wrote: > If the qcow2 check function detects a refcount block located beyond the > image end, grow the image appropriately. This cannot break anything and > is the logical fix for such a case. > > Signed-off-by: Max Reitz <mreitz@redhat.com> > --- > block/qcow2-refcount.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 46 insertions(+), 4 deletions(-) > > diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c > index babe6cb..1f0f44e 100644 > --- a/block/qcow2-refcount.c > +++ b/block/qcow2-refcount.c > @@ -1505,7 +1505,8 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res, > int64_t *nb_clusters) > { > BDRVQcowState *s = bs->opaque; > - int64_t i; > + int64_t i, size; > + int ret; > > for(i = 0; i < s->refcount_table_size; i++) { > uint64_t offset, cluster; > @@ -1521,9 +1522,50 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res, > } > > if (cluster >= *nb_clusters) { > - fprintf(stderr, "ERROR refcount block %" PRId64 > - " is outside image\n", i); > - res->corruptions++; > + fprintf(stderr, "%s refcount block %" PRId64 " is outside image\n", > + fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); > + > + if (fix & BDRV_FIX_ERRORS) { > + int64_t old_nb_clusters = *nb_clusters; > + > + ret = bdrv_truncate(bs->file, offset + s->cluster_size); > + if (ret < 0) { > + goto resize_fail; > + } > + size = bdrv_getlength(bs->file); > + if (size < 0) { > + ret = size; > + goto resize_fail; > + } > + > + *nb_clusters = size_to_clusters(s, size); > + assert(*nb_clusters >= old_nb_clusters); > + > + *refcount_table = g_try_realloc(*refcount_table, > + *nb_clusters * sizeof(uint16_t)); > + if (!*refcount_table) { > + res->check_errors++; > + return -ENOMEM; > + } > + > + memset(*refcount_table + old_nb_clusters, 0, > + (*nb_clusters - old_nb_clusters) * sizeof(uint16_t)); > + > + if (cluster >= *nb_clusters) { > + ret = -EINVAL; > + goto resize_fail; > + } > + > + res->corruptions_fixed++; > + continue; > + > +resize_fail: > + res->corruptions++; > + fprintf(stderr, "ERROR could not resize image: %s\n", > + strerror(-ret)); > + } else { > + res->corruptions++; > + } > continue; > } > > -- > 2.0.4 > Reviewed-by: Benoît Canet <benoit.canet@nodalink.com>
On 08/22/2014 10:31 AM, Max Reitz wrote: > If the qcow2 check function detects a refcount block located beyond the > image end, grow the image appropriately. This cannot break anything and > is the logical fix for such a case. Does the testsuite cover this one? I didn't see it mentioned in patch 10/10. > > Signed-off-by: Max Reitz <mreitz@redhat.com> > --- > block/qcow2-refcount.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 46 insertions(+), 4 deletions(-) >
On 26.08.2014 15:07, Eric Blake wrote: > On 08/22/2014 10:31 AM, Max Reitz wrote: >> If the qcow2 check function detects a refcount block located beyond the >> image end, grow the image appropriately. This cannot break anything and >> is the logical fix for such a case. > Does the testsuite cover this one? I didn't see it mentioned in patch 10/10. No, it doesn't. I'll add it. Max >> Signed-off-by: Max Reitz <mreitz@redhat.com> >> --- >> block/qcow2-refcount.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++---- >> 1 file changed, 46 insertions(+), 4 deletions(-) >>
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index babe6cb..1f0f44e 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -1505,7 +1505,8 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res, int64_t *nb_clusters) { BDRVQcowState *s = bs->opaque; - int64_t i; + int64_t i, size; + int ret; for(i = 0; i < s->refcount_table_size; i++) { uint64_t offset, cluster; @@ -1521,9 +1522,50 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res, } if (cluster >= *nb_clusters) { - fprintf(stderr, "ERROR refcount block %" PRId64 - " is outside image\n", i); - res->corruptions++; + fprintf(stderr, "%s refcount block %" PRId64 " is outside image\n", + fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); + + if (fix & BDRV_FIX_ERRORS) { + int64_t old_nb_clusters = *nb_clusters; + + ret = bdrv_truncate(bs->file, offset + s->cluster_size); + if (ret < 0) { + goto resize_fail; + } + size = bdrv_getlength(bs->file); + if (size < 0) { + ret = size; + goto resize_fail; + } + + *nb_clusters = size_to_clusters(s, size); + assert(*nb_clusters >= old_nb_clusters); + + *refcount_table = g_try_realloc(*refcount_table, + *nb_clusters * sizeof(uint16_t)); + if (!*refcount_table) { + res->check_errors++; + return -ENOMEM; + } + + memset(*refcount_table + old_nb_clusters, 0, + (*nb_clusters - old_nb_clusters) * sizeof(uint16_t)); + + if (cluster >= *nb_clusters) { + ret = -EINVAL; + goto resize_fail; + } + + res->corruptions_fixed++; + continue; + +resize_fail: + res->corruptions++; + fprintf(stderr, "ERROR could not resize image: %s\n", + strerror(-ret)); + } else { + res->corruptions++; + } continue; }
If the qcow2 check function detects a refcount block located beyond the image end, grow the image appropriately. This cannot break anything and is the logical fix for such a case. Signed-off-by: Max Reitz <mreitz@redhat.com> --- block/qcow2-refcount.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 46 insertions(+), 4 deletions(-)