Ivan Baravy
5822be9942
It is useless since host OS cache is used anyway. It also slows down coverage collection because of many taken branches. Specialized tests should be written to test disk cache specifically.
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <errno.h>
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#include "kolibri.h"
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typedef struct {
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FILE *file;
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uint32_t sect_size;
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uint64_t sect_cnt;
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unsigned cache_size;
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} vdisk_t;
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void *vdisk_init(const char *fname, unsigned cache_size) {
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FILE *f = fopen(fname, "r+");
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if (!f) {
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printf("vdisk: can't open file '%s': %s\n", fname, strerror(errno));
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return NULL;
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}
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fseeko(f, 0, SEEK_END);
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off_t fsize = ftello(f);
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fseeko(f, 0, SEEK_SET);
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size_t sect_size = 512;
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if (strstr(fname, "s4096") != NULL || strstr(fname, "s4k") != NULL) {
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sect_size = 4096;
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}
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vdisk_t *vdisk = (vdisk_t*)malloc(sizeof(vdisk_t));
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*vdisk = (vdisk_t){.file = f,
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.sect_size = sect_size,
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.sect_cnt = (uint64_t)fsize / sect_size,
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.cache_size = cache_size};
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return vdisk;
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}
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__attribute__((__stdcall__))
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void vdisk_close(void *userdata) {
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vdisk_t *vdisk = userdata;
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fclose(vdisk->file);
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free(vdisk);
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}
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__attribute__((__stdcall__))
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int vdisk_read(void *userdata, void *buffer, off_t startsector,
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size_t *numsectors) {
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vdisk_t *vdisk = userdata;
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fseeko(vdisk->file, startsector * vdisk->sect_size, SEEK_SET);
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fread(buffer, *numsectors * vdisk->sect_size, 1, vdisk->file);
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return ERROR_SUCCESS;
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}
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__attribute__((__stdcall__))
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int vdisk_write(void *userdata, void *buffer, off_t startsector,
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size_t *numsectors) {
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vdisk_t *vdisk = userdata;
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fseeko(vdisk->file, startsector * vdisk->sect_size, SEEK_SET);
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fwrite(buffer, *numsectors * vdisk->sect_size, 1, vdisk->file);
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return ERROR_SUCCESS;
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}
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__attribute__((__stdcall__))
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int vdisk_querymedia(void *userdata, diskmediainfo_t *minfo) {
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vdisk_t *vdisk = userdata;
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minfo->flags = 0u;
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minfo->sector_size = vdisk->sect_size;
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minfo->capacity = vdisk->sect_cnt;
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return ERROR_SUCCESS;
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}
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__attribute__((__stdcall__))
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unsigned vdisk_adjust_cache_size(vdisk_t *vdisk, unsigned suggested_size) {
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(void)suggested_size;
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return vdisk->cache_size;
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}
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