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From f1155542d2e8ce5192a4001b1156b9d3bff4a398 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 17:17:53 +0100
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Subject: [PATCH 06/41] dump: add API to write vmcore
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Message-id: <1415380693-16593-7-git-send-email-lersek@redhat.com>
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Patchwork-id: 62192
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O-Subject: [RHEL-7.1 qemu-kvm PATCH 06/26] dump: add API to write vmcore
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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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From: qiaonuohan <qiaonuohan@cn.fujitsu.com>
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Function is used to write vmcore in flatten format. In flatten format, data is
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written block by block, and in front of each block, a struct
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MakedumpfileDataHeader is stored there to indicate the offset and size of the
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data block.
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struct MakedumpfileDataHeader {
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int64_t offset;
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int64_t buf_size;
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};
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Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
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Reviewed-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
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(cherry picked from commit 5d31babe5c7d854d6b8470bc9fa67a698926e65d)
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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dump.c | 21 +++++++++++++++++++++
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1 file changed, 21 insertions(+)
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diff --git a/dump.c b/dump.c
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index 6c902e5..710893f 100644
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--- a/dump.c
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+++ b/dump.c
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@@ -734,6 +734,27 @@ static int write_end_flat_header(int fd)
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return 0;
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}
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+static int write_buffer(int fd, off_t offset, const void *buf, size_t size)
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+{
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+ size_t written_size;
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+ MakedumpfileDataHeader mdh;
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+
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+ mdh.offset = cpu_to_be64(offset);
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+ mdh.buf_size = cpu_to_be64(size);
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+
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+ written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
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+ if (written_size != sizeof(mdh)) {
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+ return -1;
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+ }
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+
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+ written_size = qemu_write_full(fd, buf, size);
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+ if (written_size != size) {
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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static ram_addr_t get_start_block(DumpState *s)
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{
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GuestPhysBlock *block;
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--
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1.8.3.1
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