5b15e2ecaf
Notable changes:
* The only big change is the switch to using a custom QIOChannel for
savevm-async, because the previously used QEMUFileOps was dropped.
Changes to the current implementation:
* Switch to vector based methods as required for an IO channel. For
short reads the passed-in IO vector is stuffed with zeroes at the
end, just to be sure.
* For reading: The documentation in include/io/channel.h states that
at least one byte should be read, so also error out when whe are
at the very end instead of returning 0.
* For reading: Fix off-by-one error when request goes beyond end.
The wrong code piece was:
if ((pos + size) > maxlen) {
size = maxlen - pos - 1;
}
Previously, the last byte would not be read. It's actually
possible to get a snapshot .raw file that has content all the way
up the final 512 byte (= BDRV_SECTOR_SIZE) boundary without any
trailing zero bytes (I wrote a script to do it).
Luckily, it didn't cause a real issue, because qemu_loadvm_state()
is not interested in the final (i.e. QEMU_VM_VMDESCRIPTION)
section. The buffer for reading it is simply freed up afterwards
and the function will assume that it read the whole section, even
if that's not the case.
* For writing: Make use of the generated blk_pwritev() wrapper
instead of manually wrapping the coroutine to simplify and save a
few lines.
* Adapt to changed interfaces for blk_{pread,pwrite}:
* a9262f551e ("block: Change blk_{pread,pwrite}() param order")
* 3b35d4542c ("block: Add a 'flags' param to blk_pread()")
* bf5b16fa40 ("block: Make blk_{pread,pwrite}() return 0 on success")
Those changes especially affected the qemu-img dd patches, because
the context also changed, but also some of our block drivers used
the functions.
* Drop qemu-common.h include: it got renamed after essentially
everything was moved to other headers. The only remaining user I
could find for things dropped from the header between 7.0 and 7.1
was qemu_get_vm_name() in the iscsi-initiatorname patch, but it
already includes the header to which the function was moved.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
81 lines
2.8 KiB
Diff
81 lines
2.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Fabian Ebner <f.ebner@proxmox.com>
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Date: Thu, 23 Jun 2022 14:00:05 +0200
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Subject: [PATCH] Revert "block/rbd: workaround for ceph issue #53784"
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This reverts commit fc176116cdea816ceb8dd969080b2b95f58edbc0 in
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preparation to revert 0347a8fd4c3faaedf119be04c197804be40a384b.
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Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
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---
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block/rbd.c | 42 ++----------------------------------------
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1 file changed, 2 insertions(+), 40 deletions(-)
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diff --git a/block/rbd.c b/block/rbd.c
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index 64a8d7d48b..9fc6dcb957 100644
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--- a/block/rbd.c
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+++ b/block/rbd.c
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@@ -1348,7 +1348,6 @@ static int coroutine_fn qemu_rbd_co_block_status(BlockDriverState *bs,
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int status, r;
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RBDDiffIterateReq req = { .offs = offset };
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uint64_t features, flags;
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- uint64_t head = 0;
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assert(offset + bytes <= s->image_size);
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@@ -1376,43 +1375,7 @@ static int coroutine_fn qemu_rbd_co_block_status(BlockDriverState *bs,
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return status;
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}
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-#if LIBRBD_VERSION_CODE < LIBRBD_VERSION(1, 17, 0)
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- /*
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- * librbd had a bug until early 2022 that affected all versions of ceph that
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- * supported fast-diff. This bug results in reporting of incorrect offsets
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- * if the offset parameter to rbd_diff_iterate2 is not object aligned.
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- * Work around this bug by rounding down the offset to object boundaries.
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- * This is OK because we call rbd_diff_iterate2 with whole_object = true.
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- * However, this workaround only works for non cloned images with default
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- * striping.
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- *
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- * See: https://tracker.ceph.com/issues/53784
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- */
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-
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- /* check if RBD image has non-default striping enabled */
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- if (features & RBD_FEATURE_STRIPINGV2) {
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- return status;
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- }
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-
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-#pragma GCC diagnostic push
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-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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- /*
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- * check if RBD image is a clone (= has a parent).
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- *
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- * rbd_get_parent_info is deprecated from Nautilus onwards, but the
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- * replacement rbd_get_parent is not present in Luminous and Mimic.
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- */
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- if (rbd_get_parent_info(s->image, NULL, 0, NULL, 0, NULL, 0) != -ENOENT) {
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- return status;
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- }
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-#pragma GCC diagnostic pop
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-
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- head = req.offs & (s->object_size - 1);
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- req.offs -= head;
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- bytes += head;
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-#endif
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-
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- r = rbd_diff_iterate2(s->image, NULL, req.offs, bytes, true, true,
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+ r = rbd_diff_iterate2(s->image, NULL, offset, bytes, true, true,
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qemu_rbd_diff_iterate_cb, &req);
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if (r < 0 && r != QEMU_RBD_EXIT_DIFF_ITERATE2) {
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return status;
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@@ -1431,8 +1394,7 @@ static int coroutine_fn qemu_rbd_co_block_status(BlockDriverState *bs,
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status = BDRV_BLOCK_ZERO | BDRV_BLOCK_OFFSET_VALID;
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}
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- assert(req.bytes > head);
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- *pnum = req.bytes - head;
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+ *pnum = req.bytes;
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return status;
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}
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