mirror of
https://github.com/ibm-s390-linux/s390-tools.git
synced 2026-08-05 02:14:52 +00:00
Mikhail Zaslonko
2c5d4073a7
Drop support of obsolete dump and dump-tool versions (single-volume DASD, FBA and Tape) in order to simplify zgetdump logic: - CCW dumpers written in assembler instructions as well as stage2 dumpers of size less than 0x3000 (STAGE2_DUMPER_SIZE_V1 or STAGE2_DUMPER_SIZE_V2) haven't been used for years. Remove its traces completely as a cleanup. Keep the last version (version 5) of non-extended DASD dumper as well as newer extended DASD dumpers. - Rename STAGE2_DUMPER_SIZE_V3 and STAGE2_DUMPER_SIZE_ZLIB constants. - Drop support of non-extended s390 dumps of version < 5. Dump files of s390 format version 5 can be still produced by zgetdump (dfo_s390). - Drop excessive dump version checking in df_s390_cpu_info_add() and df_s390_hdr_add() considering that obsolete s390 dumps of version lower than 5 no longer supported. - Use cpu_cnt field in s390 dump header instead of the s390 dump version to indicate no cpu info available (DFI_CPU_CONTENT_NONE) for dfo_s390. - Make df_s390_dumper_read() return error code upon unknown dumper version/magic detection. Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
/*
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* zgetdump - Tool for copying and converting System z dumps
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*
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* S390 single-volume DASD dump tool
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*
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* Copyright IBM Corp. 2001, 2018
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <errno.h>
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#include <linux/fs.h>
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#include "zgetdump.h"
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#include "zg.h"
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#include "dt.h"
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#include "df_s390.h"
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/*
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* File local static data
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*/
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static struct {
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struct df_s390_dumper dumper;
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enum dfi_arch dumper_arch;
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bool extended; /* Extended dump-tool */
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} l;
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/*
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* Read dump tool from ECKD DASD device
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*/
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static int dumper_read_eckd(int blk_size)
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{
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if (df_s390_dumper_read(g.fh, blk_size, &l.dumper))
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return -ENODEV;
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if (l.extended) {
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if (strncmp(l.dumper.magic, DF_S390_DUMPER_MAGIC_EXT,
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DF_S390_DUMPER_MAGIC_SIZE) != 0)
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return -ENODEV;
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} else {
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if (strncmp(l.dumper.magic, DF_S390_DUMPER_MAGIC64,
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DF_S390_DUMPER_MAGIC_SIZE) != 0)
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return -ENODEV;
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}
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l.dumper_arch = DFI_ARCH_64;
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return 0;
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}
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/*
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* Check FBA dump tool magic number and set architecture attribute
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*/
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static int dumper_check_fba(struct df_s390_dumper *dumper)
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{
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if (l.extended) {
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if (strncmp(dumper->magic, DF_S390_DUMPER_MAGIC_FBA_EXT,
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DF_S390_DUMPER_MAGIC_SIZE) != 0)
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return -ENODEV;
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} else {
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if (strncmp(dumper->magic, DF_S390_DUMPER_MAGIC64_FBA,
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DF_S390_DUMPER_MAGIC_SIZE) != 0)
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return -ENODEV;
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}
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l.dumper_arch = DFI_ARCH_64;
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return 0;
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}
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/*
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* Read dump tool on FBA disk and check its magic number
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*/
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static int dumper_read_fba(void)
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{
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struct df_s390_dumper *dumper = &l.dumper;
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int bytes_to_read;
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/*
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* On FBA device the dumper is written at the end of the volume because
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* there is not enough space to place it at the beginning due to the
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* linux disk layout.
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* First read 2 fields at the start of the dumper. The magic number
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* and the version.
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*/
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zg_seek_end(g.fh, -STAGE2_DUMPER_SIZE_SV, ZG_CHECK);
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bytes_to_read = offsetof(struct df_s390_dumper, size);
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zg_read(g.fh, dumper, bytes_to_read, ZG_CHECK);
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if (dumper_check_fba(dumper) != 0)
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return -ENODEV;
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dumper->size = STAGE2_DUMPER_SIZE_SV;
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/* Read force and mem fields in the end of the dumper */
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bytes_to_read = sizeof(dumper->force) + sizeof(dumper->mem);
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zg_seek_end(g.fh, -bytes_to_read, ZG_CHECK);
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zg_read(g.fh, &dumper->force, bytes_to_read, ZG_CHECK);
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return 0;
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}
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/*
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* Read single volume dumper from disk
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*/
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static int sv_dumper_read(void)
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{
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int blk_size;
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if (zg_type(g.fh) == ZG_TYPE_DASD_PART)
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return -ENODEV;
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zg_ioctl(g.fh, BLKSSZGET, &blk_size, "BLKSSZGET", ZG_CHECK);
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if (dumper_read_eckd(blk_size) == 0) {
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dt_attr_dasd_type_set("ECKD");
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return 0;
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}
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if (dumper_read_fba() == 0) {
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dt_attr_dasd_type_set("FBA");
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return 0;
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}
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return -ENODEV;
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}
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/*
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* Initialize s390 single-volume dump tool (for -d option)
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*/
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int dt_s390sv_init_gen(bool extended)
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{
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l.extended = extended;
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if (sv_dumper_read() != 0)
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return -ENODEV;
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dt_arch_set(l.dumper_arch);
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dt_version_set(l.dumper.version);
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dt_attr_mem_limit_set(l.dumper.mem);
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return 0;
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}
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static int dt_s390sv_init(void)
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{
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return dt_s390sv_init_gen(DUMP_NON_EXTENDED);
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}
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/*
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* s390 single-volume DT (non-extended) operations
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*/
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struct dt dt_s390sv = {
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.desc = "Single-volume DASD dump tool",
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.init = dt_s390sv_init,
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};
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