128 lines
2.4 KiB
C
128 lines
2.4 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) 2011 Sami Kerola <kerolasa@iki.fi>
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*/
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#ifndef UTIL_LINUX_MINIX_PROGRAMS_H
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#define UTIL_LINUX_MINIX_PROGRAMS_H
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#include "minix.h"
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/*
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* Global variables.
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*/
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extern int fs_version;
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extern char *super_block_buffer;
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#define Super (*(struct minix_super_block *) super_block_buffer)
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#define Super3 (*(struct minix3_super_block *) super_block_buffer)
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#define INODE_SIZE (sizeof(struct minix_inode))
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#define INODE2_SIZE (sizeof(struct minix2_inode))
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#define BITS_PER_BLOCK (MINIX_BLOCK_SIZE << 3)
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#define UPPER(size,n) ((size+((n)-1))/(n))
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/*
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* Inline functions.
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*/
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static inline unsigned long get_ninodes(void)
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{
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switch (fs_version) {
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case 3:
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return Super3.s_ninodes;
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default:
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return Super.s_ninodes;
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}
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}
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static inline unsigned long get_nzones(void)
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{
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switch (fs_version) {
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case 3:
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return Super3.s_zones;
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case 2:
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return Super.s_zones;
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default:
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return Super.s_nzones;
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}
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}
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static inline unsigned long get_nimaps(void)
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{
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switch (fs_version) {
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case 3:
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return Super3.s_imap_blocks;
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default:
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return Super.s_imap_blocks;
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}
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}
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static inline unsigned long get_nzmaps(void)
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{
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switch (fs_version) {
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case 3:
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return Super3.s_zmap_blocks;
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default:
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return Super.s_zmap_blocks;
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}
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}
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static inline off_t get_first_zone(void)
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{
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switch (fs_version) {
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case 3:
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return Super3.s_firstdatazone;
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default:
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return Super.s_firstdatazone;
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}
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}
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static inline size_t get_zone_size(void)
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{
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switch (fs_version) {
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case 3:
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return Super3.s_log_zone_size;
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default:
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return Super.s_log_zone_size;
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}
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}
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static inline size_t get_max_size(void)
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{
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switch (fs_version) {
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case 3:
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return Super3.s_max_size;
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default:
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return Super.s_max_size;
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}
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}
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static inline unsigned long inode_blocks(void)
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{
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switch (fs_version) {
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case 3:
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case 2:
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return UPPER(get_ninodes(), MINIX2_INODES_PER_BLOCK);
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default:
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return UPPER(get_ninodes(), MINIX_INODES_PER_BLOCK);
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}
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}
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static inline off_t first_zone_data(void)
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{
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return 2 + get_nimaps() + get_nzmaps() + inode_blocks();
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}
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static inline size_t get_inode_buffer_size(void)
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{
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return inode_blocks() * MINIX_BLOCK_SIZE;
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}
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#endif /* UTIL_LINUX_MINIX_PROGRAMS_H */
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