From 65ad32342584a286190e2ce56b8a3688f38f6535 Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Sat, 13 Jun 2015 16:22:17 +0200
Subject: [PATCH 23/42] qcow2: Let inc_refcounts() return -errno
Message-id: <1434212556-3927-24-git-send-email-mreitz@redhat.com>
Patchwork-id: 66042
O-Subject: [RHEL-7.2 qemu-kvm PATCH 23/42] qcow2: Let inc_refcounts() return -errno
Bugzilla: 1129893
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
BZ: 1129893
As of a future patch, inc_refcounts() will have to throw errors which
are generally signaled by returning -errno. Therefore, let it return an
integer which is either 0 for success or -errno and handle the -errno
case in all callers.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit fef4d3d5644f984e9fa427dea4f7cfa15de9059c)
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
block/qcow2-refcount.c | 91 +++++++++++++++++++++++++++++++++-----------------
1 file changed, 60 insertions(+), 31 deletions(-)
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 0dac4c9..4655fa2 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1053,17 +1053,18 @@ fail:
*
* Modifies the number of errors in res.
*/
-static void inc_refcounts(BlockDriverState *bs,
- BdrvCheckResult *res,
- uint16_t *refcount_table,
- int64_t refcount_table_size,
- int64_t offset, int64_t size)
+static int inc_refcounts(BlockDriverState *bs,
+ BdrvCheckResult *res,
+ uint16_t *refcount_table,
+ int64_t refcount_table_size,
+ int64_t offset, int64_t size)
{
BDRVQcowState *s = bs->opaque;
uint64_t start, last, cluster_offset, k;
- if (size <= 0)
- return;
+ if (size <= 0) {
+ return 0;
+ }
start = offset & ~(s->cluster_size - 1);
last = (offset + size - 1) & ~(s->cluster_size - 1);
@@ -1083,6 +1084,8 @@ static void inc_refcounts(BlockDriverState *bs,
}
}
}
+
+ return 0;
}
/* Flags for check_refcounts_l1() and check_refcounts_l2() */
@@ -1137,8 +1140,11 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
nb_csectors = ((l2_entry >> s->csize_shift) &
s->csize_mask) + 1;
l2_entry &= s->cluster_offset_mask;
- inc_refcounts(bs, res, refcount_table, refcount_table_size,
- l2_entry & ~511, nb_csectors * 512);
+ ret = inc_refcounts(bs, res, refcount_table, refcount_table_size,
+ l2_entry & ~511, nb_csectors * 512);
+ if (ret < 0) {
+ goto fail;
+ }
if (flags & CHECK_FRAG_INFO) {
res->bfi.allocated_clusters++;
@@ -1173,8 +1179,11 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
}
/* Mark cluster as used */
- inc_refcounts(bs, res, refcount_table,refcount_table_size,
- offset, s->cluster_size);
+ ret = inc_refcounts(bs, res, refcount_table, refcount_table_size,
+ offset, s->cluster_size);
+ if (ret < 0) {
+ goto fail;
+ }
/* Correct offsets are cluster aligned */
if (offset & (s->cluster_size - 1)) {
@@ -1217,19 +1226,20 @@ static int check_refcounts_l1(BlockDriverState *bs,
int flags)
{
BDRVQcowState *s = bs->opaque;
- uint64_t *l1_table, l2_offset, l1_size2;
+ uint64_t *l1_table = NULL, l2_offset, l1_size2;
int i, ret;
l1_size2 = l1_size * sizeof(uint64_t);
/* Mark L1 table as used */
- inc_refcounts(bs, res, refcount_table, refcount_table_size,
- l1_table_offset, l1_size2);
+ ret = inc_refcounts(bs, res, refcount_table, refcount_table_size,
+ l1_table_offset, l1_size2);
+ if (ret < 0) {
+ goto fail;
+ }
/* Read L1 table entries from disk */
- if (l1_size2 == 0) {
- l1_table = NULL;
- } else {
+ if (l1_size2 > 0) {
l1_table = g_try_malloc(l1_size2);
if (l1_table == NULL) {
ret = -ENOMEM;
@@ -1252,8 +1262,11 @@ static int check_refcounts_l1(BlockDriverState *bs,
if (l2_offset) {
/* Mark L2 table as used */
l2_offset &= L1E_OFFSET_MASK;
- inc_refcounts(bs, res, refcount_table, refcount_table_size,
- l2_offset, s->cluster_size);
+ ret = inc_refcounts(bs, res, refcount_table, refcount_table_size,
+ l2_offset, s->cluster_size);
+ if (ret < 0) {
+ goto fail;
+ }
/* L2 tables are cluster aligned */
if (l2_offset & (s->cluster_size - 1)) {
@@ -1520,6 +1533,7 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res,
{
BDRVQcowState *s = bs->opaque;
int64_t i;
+ int ret;
for(i = 0; i < s->refcount_table_size; i++) {
uint64_t offset, cluster;
@@ -1542,8 +1556,11 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res,
}
if (offset != 0) {
- inc_refcounts(bs, res, *refcount_table, *nb_clusters,
- offset, s->cluster_size);
+ ret = inc_refcounts(bs, res, *refcount_table, *nb_clusters,
+ offset, s->cluster_size);
+ if (ret < 0) {
+ return ret;
+ }
if ((*refcount_table)[cluster] != 1) {
fprintf(stderr, "%s refcount block %" PRId64
" refcount=%d\n",
@@ -1572,8 +1589,11 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res,
sizeof(**refcount_table));
}
(*refcount_table)[cluster]--;
- inc_refcounts(bs, res, *refcount_table, *nb_clusters,
- new_offset, s->cluster_size);
+ ret = inc_refcounts(bs, res, *refcount_table, *nb_clusters,
+ new_offset, s->cluster_size);
+ if (ret < 0) {
+ return ret;
+ }
res->corruptions_fixed++;
} else {
@@ -1605,8 +1625,11 @@ static int calculate_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
}
/* header */
- inc_refcounts(bs, res, *refcount_table, *nb_clusters,
- 0, s->cluster_size);
+ ret = inc_refcounts(bs, res, *refcount_table, *nb_clusters,
+ 0, s->cluster_size);
+ if (ret < 0) {
+ return ret;
+ }
/* current L1 table */
ret = check_refcounts_l1(bs, res, *refcount_table, *nb_clusters,
@@ -1619,18 +1642,24 @@ static int calculate_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
for (i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
ret = check_refcounts_l1(bs, res, *refcount_table, *nb_clusters,
- sn->l1_table_offset, sn->l1_size, 0);
+ sn->l1_table_offset, sn->l1_size, 0);
if (ret < 0) {
return ret;
}
}
- inc_refcounts(bs, res, *refcount_table, *nb_clusters,
- s->snapshots_offset, s->snapshots_size);
+ ret = inc_refcounts(bs, res, *refcount_table, *nb_clusters,
+ s->snapshots_offset, s->snapshots_size);
+ if (ret < 0) {
+ return ret;
+ }
/* refcount data */
- inc_refcounts(bs, res, *refcount_table, *nb_clusters,
- s->refcount_table_offset,
- s->refcount_table_size * sizeof(uint64_t));
+ ret = inc_refcounts(bs, res, *refcount_table, *nb_clusters,
+ s->refcount_table_offset,
+ s->refcount_table_size * sizeof(uint64_t));
+ if (ret < 0) {
+ return ret;
+ }
return check_refblocks(bs, res, fix, refcount_table, nb_clusters);
}
--
1.8.3.1