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From 55bfda3a0e077b822f57e8ed901f0cee848bc471 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Mon, 8 Jun 2020 15:01:35 +0100
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Subject: [PATCH 07/17] file-posix: Support BDRV_REQ_ZERO_WRITE for truncate
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20200608150140.38218-7-kwolf@redhat.com>
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Patchwork-id: 97452
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O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 06/11] file-posix: Support BDRV_REQ_ZERO_WRITE for truncate
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Bugzilla: 1780574
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RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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For regular files, we always get BDRV_REQ_ZERO_WRITE behaviour from the
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OS, so we can advertise the flag and just ignore it.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Reviewed-by: Alberto Garcia <berto@igalia.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Message-Id: <20200424125448.63318-7-kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 2f0c6e7a650de133eccd94e9bb6cf7b2070f07f1)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/file-posix.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/block/file-posix.c b/block/file-posix.c
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index 7551e8d..adafbfa 100644
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--- a/block/file-posix.c
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+++ b/block/file-posix.c
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@@ -674,6 +674,10 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
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#endif
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bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK;
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+ if (S_ISREG(st.st_mode)) {
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+ /* When extending regular files, we get zeros from the OS */
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+ bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
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+ }
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ret = 0;
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fail:
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if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
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--
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1.8.3.1
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