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From b170e55f6dff27d44e32667af0f79a4c2704711b Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Fri, 7 Nov 2014 17:18:08 +0100
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Subject: [PATCH 21/41] dump: simplify write_start_flat_header()
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Message-id: <1415380693-16593-22-git-send-email-lersek@redhat.com>
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Patchwork-id: 62207
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O-Subject: [RHEL-7.1 qemu-kvm PATCH 21/26] dump: simplify write_start_flat_header()
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Bugzilla: 1157798
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
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RH-Acked-by: dgibson <dgibson@redhat.com>
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Currently, the function
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- defines and populates an auto variable of type MakedumpfileHeader
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- allocates and zeroes a buffer of size MAX_SIZE_MDF_HEADER (4096)
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- copies the former into the latter (covering an initial portion of the
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latter)
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Fill in the MakedumpfileHeader structure in its final place (the alignment
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is OK because the structure lives at the address returned by g_malloc0()).
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Approximately-suggested-by: Luiz Capitulino <lcapitulino@redhat.com>
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
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(cherry picked from commit 92ba1401e0f81ea170803045c1ae366bf5d9d87e)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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dump.c | 20 +++++++++-----------
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1 file changed, 9 insertions(+), 11 deletions(-)
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diff --git a/dump.c b/dump.c
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index 533b914..ee28777 100644
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--- a/dump.c
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+++ b/dump.c
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@@ -717,27 +717,25 @@ static int create_vmcore(DumpState *s)
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static int write_start_flat_header(int fd)
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{
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- uint8_t *buf;
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- MakedumpfileHeader mh;
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+ MakedumpfileHeader *mh;
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int ret = 0;
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- memset(&mh, 0, sizeof(mh));
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- memcpy(mh.signature, MAKEDUMPFILE_SIGNATURE,
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- MIN(sizeof mh.signature, sizeof MAKEDUMPFILE_SIGNATURE));
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+ QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER);
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+ mh = g_malloc0(MAX_SIZE_MDF_HEADER);
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- mh.type = cpu_to_be64(TYPE_FLAT_HEADER);
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- mh.version = cpu_to_be64(VERSION_FLAT_HEADER);
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+ memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE,
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+ MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE));
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- buf = g_malloc0(MAX_SIZE_MDF_HEADER);
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- memcpy(buf, &mh, sizeof(mh));
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+ mh->type = cpu_to_be64(TYPE_FLAT_HEADER);
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+ mh->version = cpu_to_be64(VERSION_FLAT_HEADER);
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size_t written_size;
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- written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER);
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+ written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER);
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if (written_size != MAX_SIZE_MDF_HEADER) {
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ret = -1;
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}
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- g_free(buf);
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+ g_free(mh);
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return ret;
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}
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--
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1.8.3.1
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