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From faa6207ac40f548cb7f033e07717e98c9bfb1249 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 17:17:52 +0100
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Subject: [PATCH 05/41] dump: add API to write header of flatten format
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Message-id: <1415380693-16593-6-git-send-email-lersek@redhat.com>
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Patchwork-id: 62191
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O-Subject: [RHEL-7.1 qemu-kvm PATCH 05/26] dump: add API to write header of flatten format
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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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flatten format will be used when writing kdump-compressed format. The format is
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also used by makedumpfile, you can refer to the following URL to get more
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detailed information about flatten format of kdump-compressed format:
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http://sourceforge.net/projects/makedumpfile/
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The two functions here are used to write start flat header and end flat header
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to vmcore, and they will be called later when flatten format is used.
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struct MakedumpfileHeader stored at the head of vmcore is used to indicate the
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vmcore is in flatten format.
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struct MakedumpfileHeader {
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    char signature[16];     /* = "makedumpfile" */
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    int64_t type;           /* = 1 */
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    int64_t version;        /* = 1 */
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};
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And struct MakedumpfileDataHeader, with offset and buf_size set to -1, is used
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to indicate the end of vmcore in flatten format.
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struct MakedumpfileDataHeader {
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    int64_t offset;         /* = -1 */
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    int64_t buf_size;       /* = -1 */
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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 fda053875e69120b2fde5fb34975ef5a49290f12)
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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                | 42 ++++++++++++++++++++++++++++++++++++++++++
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 include/sysemu/dump.h | 17 +++++++++++++++++
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 2 files changed, 59 insertions(+)
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diff --git a/dump.c b/dump.c
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index fed8bd6..6c902e5 100644
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--- a/dump.c
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+++ b/dump.c
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@@ -692,6 +692,48 @@ static int create_vmcore(DumpState *s)
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     return 0;
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 }
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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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+    int ret = 0;
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+
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+    memset(&mh, 0, sizeof(mh));
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+    strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE,
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+            strlen(MAKEDUMPFILE_SIGNATURE));
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+
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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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+
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+    buf = g_malloc0(MAX_SIZE_MDF_HEADER);
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+    memcpy(buf, &mh, sizeof(mh));
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+
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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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+    if (written_size != MAX_SIZE_MDF_HEADER) {
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+        ret = -1;
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+    }
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+
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+    g_free(buf);
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+    return ret;
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+}
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+
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+static int write_end_flat_header(int fd)
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+{
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+    MakedumpfileDataHeader mdh;
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+
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+    mdh.offset = END_FLAG_FLAT_HEADER;
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+    mdh.buf_size = END_FLAG_FLAT_HEADER;
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+
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+    size_t written_size;
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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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+    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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diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
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index 19fafb2..b32b390 100644
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--- a/include/sysemu/dump.h
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+++ b/include/sysemu/dump.h
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@@ -14,12 +14,29 @@
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 #ifndef DUMP_H
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 #define DUMP_H
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+#define MAKEDUMPFILE_SIGNATURE      "makedumpfile"
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+#define MAX_SIZE_MDF_HEADER         (4096) /* max size of makedumpfile_header */
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+#define TYPE_FLAT_HEADER            (1)    /* type of flattened format */
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+#define VERSION_FLAT_HEADER         (1)    /* version of flattened format */
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+#define END_FLAG_FLAT_HEADER        (-1)
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+
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 typedef struct ArchDumpInfo {
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     int d_machine;  /* Architecture */
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     int d_endian;   /* ELFDATA2LSB or ELFDATA2MSB */
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     int d_class;    /* ELFCLASS32 or ELFCLASS64 */
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 } ArchDumpInfo;
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+typedef struct QEMU_PACKED MakedumpfileHeader {
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+    char signature[16];     /* = "makedumpfile" */
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+    int64_t type;
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+    int64_t version;
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+} MakedumpfileHeader;
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+
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+typedef struct QEMU_PACKED MakedumpfileDataHeader {
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+    int64_t offset;
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+    int64_t buf_size;
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+} MakedumpfileDataHeader;
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+
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 struct GuestPhysBlockList; /* memory_mapping.h */
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 int cpu_get_dump_info(ArchDumpInfo *info,
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                       const struct GuestPhysBlockList *guest_phys_blocks);
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-- 
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1.8.3.1
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