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[50/67] qcow2: Inform block layer about discard boundaries

Message ID 1481762701-4587-51-git-send-email-mdroth@linux.vnet.ibm.com
State New
Headers show

Commit Message

Michael Roth Dec. 15, 2016, 12:44 a.m. UTC 
From: Eric Blake <eblake@redhat.com>

At the qcow2 layer, discard is only possible on a per-cluster
basis; at the moment, qcow2 silently rounds any unaligned
requests to this granularity.  However, an upcoming patch will
fix a regression in the block layer ignoring too much of an
unaligned discard request, by changing the block layer to
break up a discard request at alignment boundaries; for that
to work, the block layer must know about our limits.

However, we can't go one step further by changing
qcow2_discard_clusters() to assert that requests are always
aligned, since that helper function is reached on paths
outside of the block layer.

CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit ecdbead659f037dc572bba9eb1cd31a5a1a9ad9a)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 block/qcow2.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox

Patch

diff --git a/block/qcow2.c b/block/qcow2.c
index 91ef4df..497df0f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1204,6 +1204,7 @@  static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp)
         bs->bl.request_alignment = BDRV_SECTOR_SIZE;
     }
     bs->bl.pwrite_zeroes_alignment = s->cluster_size;
+    bs->bl.pdiscard_alignment = s->cluster_size;
 }
 
 static int qcow2_set_key(BlockDriverState *bs, const char *key)