From 17658e0660b29e530c3083a8371ddaded7337ed3 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Sat, 22 Mar 2014 03:31:00 +0100 Subject: [PATCH 09/30] dump: add API to write vmcore RH-Author: Laszlo Ersek Message-id: <1395459071-19118-9-git-send-email-lersek@redhat.com> Patchwork-id: 58220 O-Subject: [RHEL-6.6 qemu-kvm PATCH 08/19] dump: add API to write vmcore Bugzilla: 1035162 RH-Acked-by: Paolo Bonzini RH-Acked-by: Dr. David Alan Gilbert (git) RH-Acked-by: Luiz Capitulino From: qiaonuohan Function is used to write vmcore in flatten format. In flatten format, data is written block by block, and in front of each block, a struct MakedumpfileDataHeader is stored there to indicate the offset and size of the data block. struct MakedumpfileDataHeader { int64_t offset; int64_t buf_size; }; Signed-off-by: Qiao Nuohan Reviewed-by: Laszlo Ersek Signed-off-by: Luiz Capitulino (cherry picked from commit 5d31babe5c7d854d6b8470bc9fa67a698926e65d) Signed-off-by: Laszlo Ersek --- dump.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) Signed-off-by: Miroslav Rezanina --- dump.c | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-) diff --git a/dump.c b/dump.c index 12d234d..42dabe3 100644 --- a/dump.c +++ b/dump.c @@ -728,6 +728,27 @@ static int write_end_flat_header(int fd) return 0; } +static int write_buffer(int fd, off_t offset, const void *buf, size_t size) +{ + size_t written_size; + MakedumpfileDataHeader mdh; + + mdh.offset = cpu_to_be64(offset); + mdh.buf_size = cpu_to_be64(size); + + written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); + if (written_size != sizeof(mdh)) { + return -1; + } + + written_size = qemu_write_full(fd, buf, size); + if (written_size != size) { + return -1; + } + + return 0; +} + static ram_addr_t get_start_block(DumpState *s) { GuestPhysBlock *block; -- 1.7.1