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[v6,24/32] qcow2: Add subcluster support to check_refcounts_l2()

Message ID f7a608fdd820898f1a40a08bf01d532c5e1e0a12.1590331741.git.berto@igalia.com
State New
Headers show
Series Add subcluster allocation to qcow2 | expand

Commit Message

Alberto Garcia May 24, 2020, 2:51 p.m. UTC
Setting the QCOW_OFLAG_ZERO bit of the L2 entry is forbidden if an
image has subclusters. Instead, the individual 'all zeroes' bits must
be used.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 block/qcow2-refcount.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 770c5dbc83..696e4dad07 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1686,8 +1686,13 @@  static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
                         int ign = active ? QCOW2_OL_ACTIVE_L2 :
                                            QCOW2_OL_INACTIVE_L2;
 
-                        l2_entry = QCOW_OFLAG_ZERO;
-                        set_l2_entry(s, l2_table, i, l2_entry);
+                        if (has_subclusters(s)) {
+                            set_l2_entry(s, l2_table, i, 0);
+                            set_l2_bitmap(s, l2_table, i,
+                                          QCOW_L2_BITMAP_ALL_ZEROES);
+                        } else {
+                            set_l2_entry(s, l2_table, i, QCOW_OFLAG_ZERO);
+                        }
                         ret = qcow2_pre_write_overlap_check(bs, ign,
                                 l2e_offset, l2_entry_size(s), false);
                         if (ret < 0) {