From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59352) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W448s-0008EM-7e for qemu-devel@nongnu.org; Fri, 17 Jan 2014 02:47:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1W448l-0003Sc-3i for qemu-devel@nongnu.org; Fri, 17 Jan 2014 02:47:02 -0500 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:38919) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W448k-0003S0-Kc for qemu-devel@nongnu.org; Fri, 17 Jan 2014 02:46:55 -0500 Received: from m2.gw.fujitsu.co.jp (unknown [10.0.50.72]) by fgwmail6.fujitsu.co.jp (Postfix) with ESMTP id B56793EE0CD for ; Fri, 17 Jan 2014 16:46:53 +0900 (JST) Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id A203645DE56 for ; Fri, 17 Jan 2014 16:46:53 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.nic.fujitsu.com [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 8804A45DE54 for ; Fri, 17 Jan 2014 16:46:53 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 71392E08004 for ; Fri, 17 Jan 2014 16:46:53 +0900 (JST) Received: from s00.gw.fujitsu.co.jp (s00.gw.nic.fujitsu.com [133.161.11.15]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 203B31DB803F for ; Fri, 17 Jan 2014 16:46:53 +0900 (JST) Received: from s00.gw.fujitsu.co.jp (kw-mxio2.gw.nic.fujitsu.com [10.0.237.142]) by s00.gw.fujitsu.co.jp (Postfix) with ESMTP id 9C8DB1180C5 for ; Fri, 17 Jan 2014 16:46:51 +0900 (JST) Received: from G08FNSTD100518.localdomain (unknown [10.167.226.68]) by s00.gw.fujitsu.co.jp (Postfix) with ESMTP id 330BDAC493 for ; Fri, 17 Jan 2014 16:46:51 +0900 (JST) From: qiaonuohan Date: Fri, 17 Jan 2014 15:46:09 +0800 Message-Id: <1389944779-31899-4-git-send-email-qiaonuohan@cn.fujitsu.com> In-Reply-To: <1389944779-31899-1-git-send-email-qiaonuohan@cn.fujitsu.com> References: <1389944779-31899-1-git-send-email-qiaonuohan@cn.fujitsu.com> Subject: [Qemu-devel] [PATCH 03/13 v7] dump: add API to write header of flatten format List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: lersek@redhat.com, stefanha@gmail.com, lcapitulino@redhat.com, afaerber@suse.de, eblake@redhat.com Cc: kumagai-atsushi@mxc.nes.nec.co.jp, qiaonuohan , anderson@redhat.com, qemu-devel@nongnu.org flatten format will be used when writing kdump-compressed format. The format is also used by makedumpfile, you can refer to the following URL to get more detailed information about flatten format of kdump-compressed format: http://sourceforge.net/projects/makedumpfile/ The two functions here are used to write start flat header and end flat header to vmcore, and they will be called later when flatten format is used. struct MakedumpfileHeader stored at the head of vmcore is used to indicate the vmcore is in flatten format. struct MakedumpfileHeader { char signature[16]; /* = "makedumpfile" */ int64_t type; /* = 1 */ int64_t version; /* = 1 */ }; And struct MakedumpfileDataHeader, with offset and buf_size set to -1, is used to indicate the end of vmcore in flatten format. struct MakedumpfileDataHeader { int64_t offset; /* = -1 */ int64_t buf_size; /* = -1 */ }; Signed-off-by: Qiao Nuohan Reviewed-by: Laszlo Ersek --- dump.c | 42 ++++++++++++++++++++++++++++++++++++++++++ include/sysemu/dump.h | 17 +++++++++++++++++ 2 files changed, 59 insertions(+), 0 deletions(-) diff --git a/dump.c b/dump.c index c9d3492..f233b3e 100644 --- a/dump.c +++ b/dump.c @@ -686,6 +686,48 @@ static int create_vmcore(DumpState *s) return 0; } +static int write_start_flat_header(int fd) +{ + uint8_t *buf; + MakedumpfileHeader mh; + int ret = 0; + + memset(&mh, 0, sizeof(mh)); + strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE, + strlen(MAKEDUMPFILE_SIGNATURE)); + + mh.type = cpu_to_be64(TYPE_FLAT_HEADER); + mh.version = cpu_to_be64(VERSION_FLAT_HEADER); + + buf = g_malloc0(MAX_SIZE_MDF_HEADER); + memcpy(buf, &mh, sizeof(mh)); + + size_t written_size; + written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER); + if (written_size != MAX_SIZE_MDF_HEADER) { + ret = -1; + } + + g_free(buf); + return ret; +} + +static int write_end_flat_header(int fd) +{ + MakedumpfileDataHeader mdh; + + mdh.offset = END_FLAG_FLAT_HEADER; + mdh.buf_size = END_FLAG_FLAT_HEADER; + + size_t written_size; + written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); + if (written_size != sizeof(mdh)) { + return -1; + } + + return 0; +} + static ram_addr_t get_start_block(DumpState *s) { GuestPhysBlock *block; diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h index 19fafb2..b32b390 100644 --- a/include/sysemu/dump.h +++ b/include/sysemu/dump.h @@ -14,12 +14,29 @@ #ifndef DUMP_H #define DUMP_H +#define MAKEDUMPFILE_SIGNATURE "makedumpfile" +#define MAX_SIZE_MDF_HEADER (4096) /* max size of makedumpfile_header */ +#define TYPE_FLAT_HEADER (1) /* type of flattened format */ +#define VERSION_FLAT_HEADER (1) /* version of flattened format */ +#define END_FLAG_FLAT_HEADER (-1) + typedef struct ArchDumpInfo { int d_machine; /* Architecture */ int d_endian; /* ELFDATA2LSB or ELFDATA2MSB */ int d_class; /* ELFCLASS32 or ELFCLASS64 */ } ArchDumpInfo; +typedef struct QEMU_PACKED MakedumpfileHeader { + char signature[16]; /* = "makedumpfile" */ + int64_t type; + int64_t version; +} MakedumpfileHeader; + +typedef struct QEMU_PACKED MakedumpfileDataHeader { + int64_t offset; + int64_t buf_size; +} MakedumpfileDataHeader; + struct GuestPhysBlockList; /* memory_mapping.h */ int cpu_get_dump_info(ArchDumpInfo *info, const struct GuestPhysBlockList *guest_phys_blocks); -- 1.7.1