48 lines
1.9 KiB
Diff
48 lines
1.9 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: Fri, 20 May 2022 09:59:22 +0200
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Subject: [PATCH] block/gluster: correctly set max_pdiscard
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On 64-bit platforms, assigning SIZE_MAX to the int64_t max_pdiscard
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results in a negative value, and the following assertion would trigger
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down the line (it's not the same max_pdiscard, but computed from the
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other one):
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qemu-system-x86_64: ../block/io.c:3166: bdrv_co_pdiscard: Assertion
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`max_pdiscard >= bs->bl.request_alignment' failed.
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On 32-bit platforms, it's fine to keep using SIZE_MAX.
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The assertion in qemu_gluster_co_pdiscard() is checking that the value
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of 'bytes' can safely be passed to glfs_discard_async(), which takes a
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size_t for the argument in question, so it is kept as is. And since
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max_pdiscard is still <= SIZE_MAX, relying on max_pdiscard is still
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fine.
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Fixes: 0c8022876f ("block: use int64_t instead of int in driver discard handlers")
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
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Message-Id: <20220520075922.43972-1-f.ebner@proxmox.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry-picked from commit 9b38fc56c054c7de65fa3bf7cdd82b32654f6b7d)
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Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
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---
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block/gluster.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/block/gluster.c b/block/gluster.c
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index 80b75cb96c..1079b6186b 100644
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--- a/block/gluster.c
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+++ b/block/gluster.c
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@@ -901,7 +901,7 @@ out:
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static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp)
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{
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bs->bl.max_transfer = GLUSTER_MAX_TRANSFER;
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- bs->bl.max_pdiscard = SIZE_MAX;
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+ bs->bl.max_pdiscard = MIN(SIZE_MAX, INT64_MAX);
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}
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static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
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