qemu-kvm/SOURCES/kvm-block-rbd-workaround-for-ceph-issue-53784.patch

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From 8c50eedf03d8e62acd387b9aa9369dadcea9324c Mon Sep 17 00:00:00 2001
From: Peter Lieven <pl@kamp.de>
Date: Thu, 13 Jan 2022 15:44:26 +0100
Subject: [PATCH 6/6] block/rbd: workaround for ceph issue #53784
RH-Author: Stefano Garzarella <sgarzare@redhat.com>
RH-MergeRequest: 110: block/rbd: fix handling of holes in .bdrv_co_block_status
RH-Commit: [2/2] 1384557462e89bb539d0d25a1a471ad738fb9e89
RH-Bugzilla: 2037135
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Hanna Reitz <hreitz@redhat.com>
librbd had a bug until early 2022 that affected all versions of ceph that
supported fast-diff. This bug results in reporting of incorrect offsets
if the offset parameter to rbd_diff_iterate2 is not object aligned.
This patch works around this bug for pre Quincy versions of librbd.
Fixes: 0347a8fd4c3faaedf119be04c197804be40a384b
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <20220113144426.4036493-3-pl@kamp.de>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Tested-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit fc176116cdea816ceb8dd969080b2b95f58edbc0)
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
block/rbd.c | 42 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 40 insertions(+), 2 deletions(-)
diff --git a/block/rbd.c b/block/rbd.c
index 20bb896c4a..8f183eba2a 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -1320,6 +1320,7 @@ static int coroutine_fn qemu_rbd_co_block_status(BlockDriverState *bs,
int status, r;
RBDDiffIterateReq req = { .offs = offset };
uint64_t features, flags;
+ uint64_t head = 0;
assert(offset + bytes <= s->image_size);
@@ -1347,7 +1348,43 @@ static int coroutine_fn qemu_rbd_co_block_status(BlockDriverState *bs,
return status;
}
- r = rbd_diff_iterate2(s->image, NULL, offset, bytes, true, true,
+#if LIBRBD_VERSION_CODE < LIBRBD_VERSION(1, 17, 0)
+ /*
+ * librbd had a bug until early 2022 that affected all versions of ceph that
+ * supported fast-diff. This bug results in reporting of incorrect offsets
+ * if the offset parameter to rbd_diff_iterate2 is not object aligned.
+ * Work around this bug by rounding down the offset to object boundaries.
+ * This is OK because we call rbd_diff_iterate2 with whole_object = true.
+ * However, this workaround only works for non cloned images with default
+ * striping.
+ *
+ * See: https://tracker.ceph.com/issues/53784
+ */
+
+ /* check if RBD image has non-default striping enabled */
+ if (features & RBD_FEATURE_STRIPINGV2) {
+ return status;
+ }
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+ /*
+ * check if RBD image is a clone (= has a parent).
+ *
+ * rbd_get_parent_info is deprecated from Nautilus onwards, but the
+ * replacement rbd_get_parent is not present in Luminous and Mimic.
+ */
+ if (rbd_get_parent_info(s->image, NULL, 0, NULL, 0, NULL, 0) != -ENOENT) {
+ return status;
+ }
+#pragma GCC diagnostic pop
+
+ head = req.offs & (s->object_size - 1);
+ req.offs -= head;
+ bytes += head;
+#endif
+
+ r = rbd_diff_iterate2(s->image, NULL, req.offs, bytes, true, true,
qemu_rbd_diff_iterate_cb, &req);
if (r < 0 && r != QEMU_RBD_EXIT_DIFF_ITERATE2) {
return status;
@@ -1366,7 +1403,8 @@ static int coroutine_fn qemu_rbd_co_block_status(BlockDriverState *bs,
status = BDRV_BLOCK_ZERO | BDRV_BLOCK_OFFSET_VALID;
}
- *pnum = req.bytes;
+ assert(req.bytes > head);
+ *pnum = req.bytes - head;
return status;
}
--
2.27.0