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130 lines
2.9 KiB
130 lines
2.9 KiB
/*
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* Copyright (c) 2011 Cyril Hrubis <chrubis@suse.cz>
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef LTP_AIODIO_COMMON_SPARSE
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#define LTP_AIODIO_COMMON_SPARSE
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#include "common_checkzero.h"
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/*
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* This code tries to create dirty free blocks on
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* the HDD so there is a chance that blocks to be allocated
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* for a file are filled with something else than zeroes.
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*
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* The usefulness of this is IMHO questionable.
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*/
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static void dirty_freeblocks(int size)
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{
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int fd;
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void *p;
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int pg;
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char *filename = "dirty_freeblocks";
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pg = getpagesize();
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size = ((size + pg - 1) / pg) * pg;
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fd = open(filename, O_CREAT|O_RDWR|O_EXCL, 0600);
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if (fd < 0)
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tst_brkm(TBROK|TERRNO, cleanup, "failed to open '%s'", filename);
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SAFE_FTRUNCATE(cleanup, fd, size);
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p = SAFE_MMAP(cleanup, NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED|MAP_FILE, fd, 0);
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memset(p, 0xaa, size);
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msync(p, size, MS_SYNC);
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munmap(p, size);
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close(fd);
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unlink(filename);
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}
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/*
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* Scale value by kilo, mega, or giga.
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*/
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long long scale_by_kmg(long long value, char scale)
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{
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switch (scale) {
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case 'g':
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case 'G':
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value *= 1024;
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case 'm':
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case 'M':
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value *= 1024;
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case 'k':
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case 'K':
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value *= 1024;
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break;
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case '\0':
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break;
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default:
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usage();
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break;
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}
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return value;
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}
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/*
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* Make sure we read only zeroes,
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* either there is a hole in the file,
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* or zeroes were actually written by parent.
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*/
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static void read_sparse(char *filename, int filesize)
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{
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int fd;
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int i, j, r;
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char buf[4096];
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fd = open(filename, O_RDONLY);
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if (fd == -1) {
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if (debug)
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fprintf(stderr, "Child %i failed to open '%s'\n",
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getpid(), filename);
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exit(10);
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}
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if (debug)
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fprintf(stderr, "Child %i has opened '%s' for reading\n",
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getpid(), filename);
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for (i = 0; i < 100000000; i++) {
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off_t offset = 0;
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char *badbuf;
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if (debug)
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fprintf(stderr, "Child %i loop %i\n", getpid(), i);
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lseek(fd, SEEK_SET, 0);
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for (j = 0; j < filesize+1; j += sizeof(buf)) {
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r = read(fd, buf, sizeof(buf));
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if (r > 0) {
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if ((badbuf = check_zero(buf, r))) {
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fprintf(stderr, "non-zero read at offset %u\n",
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(unsigned int)(offset + badbuf - buf));
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exit(10);
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}
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}
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offset += r;
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}
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}
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exit(0);
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}
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#endif /* LTP_AIODIO_COMMON_SPARSE */
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