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From de5542b5a8dc74f413bf2f1b0d5f4b370aa6801b Mon Sep 17 00:00:00 2001
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From: Maxim Levitsky <mlevitsk@redhat.com>
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Date: Wed, 5 Jun 2019 13:57:05 +0200
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Subject: [PATCH 17/23] qemu-io: Add write -n for BDRV_REQ_NO_FALLBACK
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RH-Author: Maxim Levitsky <mlevitsk@redhat.com>
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Message-id: <20190605135705.24526-10-mlevitsk@redhat.com>
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Patchwork-id: 88565
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 9/9] qemu-io: Add write -n for BDRV_REQ_NO_FALLBACK
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Bugzilla: 1648622
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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From: Kevin Wolf <kwolf@redhat.com>
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This makes the new BDRV_REQ_NO_FALLBACK flag available in the qemu-io
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write command.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Acked-by: Eric Blake <eblake@redhat.com>
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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1648622
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Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
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(Cherry picked from c6e3f520c802c5cb2de80576aba7f9f1fe985d8b)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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qemu-io-cmds.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
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index 9c51e57..ac8c533 100644
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--- a/qemu-io-cmds.c
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+++ b/qemu-io-cmds.c
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@@ -945,6 +945,7 @@ static void write_help(void)
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" -b, -- write to the VM state rather than the virtual disk\n"
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" -c, -- write compressed data with blk_write_compressed\n"
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" -f, -- use Force Unit Access semantics\n"
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+" -n, -- with -z, don't allow slow fallback\n"
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" -p, -- ignored for backwards compatibility\n"
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" -P, -- use different pattern to fill file\n"
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" -C, -- report statistics in a machine parsable format\n"
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@@ -963,7 +964,7 @@ static const cmdinfo_t write_cmd = {
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.perm = BLK_PERM_WRITE,
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.argmin = 2,
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.argmax = -1,
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- .args = "[-bcCfquz] [-P pattern] off len",
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+ .args = "[-bcCfnquz] [-P pattern] off len",
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.oneline = "writes a number of bytes at a specified offset",
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.help = write_help,
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};
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@@ -982,7 +983,7 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
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int64_t total = 0;
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int pattern = 0xcd;
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- while ((c = getopt(argc, argv, "bcCfpP:quz")) != -1) {
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+ while ((c = getopt(argc, argv, "bcCfnpP:quz")) != -1) {
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switch (c) {
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case 'b':
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bflag = true;
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@@ -996,6 +997,9 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
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case 'f':
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flags |= BDRV_REQ_FUA;
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break;
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+ case 'n':
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+ flags |= BDRV_REQ_NO_FALLBACK;
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+ break;
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case 'p':
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/* Ignored for backwards compatibility */
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break;
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@@ -1036,6 +1040,11 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
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return -EINVAL;
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}
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+ if ((flags & BDRV_REQ_NO_FALLBACK) && !zflag) {
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+ printf("-n requires -z to be specified\n");
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+ return -EINVAL;
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+ }
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+
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if ((flags & BDRV_REQ_MAY_UNMAP) && !zflag) {
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printf("-u requires -z to be specified\n");
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return -EINVAL;
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--
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1.8.3.1
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