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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>
58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/*
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* s390-tools/zipl/include/bootmap.h
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* Functions to handle environment block.
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*
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* Copyright IBM Corp. 2020
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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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#include "boot/page.h"
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#define ZIPL_ENVBLK_SIGNATURE "# zIPL Environment Block\n"
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#define ENVBLK_DEFAULT_IMPORT_SOURCE "/etc/ziplenv"
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/*
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* The following limit can be increased. It requires modifications
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* of the code, which is responsible for handling environment in
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* stage3, which will increase its memory footprint.
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*/
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#define ENVBLK_MAX_LINES (PAGE_SIZE / 8 /* sizeof(struct env_hash_entry */)
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#define ENVBLK_MAX_IMPORT_SIZE(envblk_size) \
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(envblk_size - sizeof(ZIPL_ENVBLK_SIGNATURE) + 1)
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/* get name by prefixed name PNAME and by logical prefix P */
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static inline const char *get_name(const char *p, const char *pname)
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{
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return p ? pname + strlen(p) : pname;
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}
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/* get name length by prefixed name PNAME and by logical prefix P */
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static inline size_t get_name_len(const char *p, const char *pname)
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{
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return p ? strlen(pname) - strlen(p) : strlen(pname);
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}
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int envblk_offset_get(struct misc_fd *mfd, off_t *off);
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int envblk_offset_set(struct misc_fd *mfd, off_t off);
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int envblk_size_get(struct misc_fd *mfd, int *size);
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int envblk_check_name(const char *name, int len);
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int envblk_import(char *from, char *to, int size);
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char *envblk_next_line(char *s, const char *end);
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int envblk_scan(char *envblk, unsigned int envblk_size,
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int (*actor)(char *name, void *data), void *data);
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void envblk_print(char *envblk, unsigned int envblk_size);
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void envblk_create_blank(char *envblk, int envblk_len);
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void envblk_blank(char *envblk, int envblk_len);
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int envblk_list_site(char *envblk, unsigned int envblk_size, int site_id);
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int envblk_list_effective_site(char *envblk, unsigned int envblk_size,
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int site_id);
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int envblk_list_all(char *envblk, unsigned int envblk_size, int indent);
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int envblk_set(char *envblk, unsigned int envblk_size, const char *name,
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const char *new_val);
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int envblk_unset(char *envblk, int envblk_len, const char *pname,
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const char *site_id);
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int envblk_remove_namespace(char *envblk, unsigned int envblk_size,
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const char *site_id);
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