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https://github.com/ibm-s390-linux/s390-tools.git
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b94566048b
Introduce a write simulation operation, which doesn't write actual data and just updates the current position in the file. This allows to emulate block lists for files located on raw devices (not formatted with a file system). This is used by the next patches in the series to implement '--dry-run' zipl option for dumps of all types (not only ngdumps). Introduce a 'misc file descriptor', which allows to mark individual files as "opened in a simulation mode". Whenever bulding a bootmap file, use either real write, or write simulation depending on the mode set in the 'misc file descriptor'. Tested-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Reviewed-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
59 lines
1.2 KiB
C
59 lines
1.2 KiB
C
/*
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* s390-tools/zipl/include/bootmap.h
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* Functions to build the bootmap file.
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*
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* Copyright IBM Corp. 2001, 2017
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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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*/
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#ifndef BOOTMAP_H
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#define BOOTMAP_H
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#include "lib/zt_common.h"
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#include "disk.h"
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#include "job.h"
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#include "zipl.h"
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#include "stddef.h"
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#define BOOTMAP_HEADER_VERSION 1
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#define PROGRAM_TABLE_BLOCK_SIZE 512
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#define SIGNATURE_MAGIC "~Module signature appended~\n"
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#define PKCS7_FORMAT 0x01
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struct bootmap_header {
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char header_text[48];
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u64 version;
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u64 envblk_offset;
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char reserved[448];
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};
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/*
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* The file_signature structure and the PKEY_ID definition
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* are based on linux/scripts/sign-file.c
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*/
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struct file_signature {
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u8 algorithm;
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u8 hash;
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u8 id_type;
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u8 signer_len;
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u8 key_id_len;
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u8 __pad[3];
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u32 sig_len;
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char magic[28];
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};
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#define PKEY_ID_PKCS7 0x02
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int bootmap_header_init(struct misc_fd *mfd);
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int bootmap_header_read(struct misc_fd *mfd, struct bootmap_header *bh);
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int bootmap_header_write(struct misc_fd *mfd, struct bootmap_header *bh);
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void bootmap_store_blockptr(void *buffer, disk_blockptr_t *ptr,
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struct disk_info *info, int fid);
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#endif /* if not BOOTMAP_H */
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