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1
by Tim Dijkstra
Import upstream version 0.99.2 |
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/*
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* mark a swap device as not usable for thaw
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*
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* Copyright 2006 Red Hat, Inc.
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*
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* Authors:
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* Peter Jones <pjones@redhat.com>
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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 version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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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 the
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* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#define _GNU_SOURCE 1
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#include <sys/ioctl.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <stdint.h> |
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/* XXX this is a total hack for bad system headers. */
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typedef u_int32_t __u32; |
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#include <linux/pmu.h> |
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typedef u_int64_t sector_t; |
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/*
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* Here's what the disk looks like after a successful hibernate:
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00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
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*
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00000400 01 00 00 00 ff df 03 00 00 00 00 00 00 00 00 00 |................|
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00000410 00 00 00 00 00 00 00 00 00 00 00 00 73 77 61 70 |............swap|
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00000420 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
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*
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00000fe0 00 00 00 00 01 00 00 00 00 00 00 00 53 57 41 50 |............SWAP|
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00000ff0 53 50 41 43 45 32 53 31 53 55 53 50 45 4e 44 00 |SPACE2S1SUSPEND.|
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* And here's what it looks like if you haven't hibernated to it:
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00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
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*
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00000400 01 00 00 00 ff df 03 00 00 00 00 00 00 00 00 00 |................|
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00000410 00 00 00 00 00 00 00 00 00 00 00 00 73 77 61 70 |............swap|
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00000420 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
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*
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00000ff0 00 00 00 00 00 00 53 57 41 50 53 50 41 43 45 32 |......SWAPSPACE2|
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*
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*/
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/* The signature offset is annoying. The struct is:
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* struct swsusp_header {
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* char reserved[PAGE_SIZE - 20 - sizeof(sector_t)];
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* sector_t image;
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* char orig_sig[10];
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* char sig[10];
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* }
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*/
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off_t get_sig_offset(int orig) |
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{
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int pagesize = sysconf(_SC_PAGESIZE); |
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return (off_t)((sizeof (char) * pagesize) - (orig ? 20 : 10)); |
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}
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static inline int |
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print_usage(FILE *output, int retval) |
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{
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fprintf(output, "usage: pm-reset-swap <device node>\n"); |
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return retval; |
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}
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int check_resume_block(FILE *dev, off_t offset) |
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{
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char buf[11] = {0,}; |
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off_t location = offset + get_sig_offset(0); |
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if (fseek(dev, location, SEEK_SET) < 0) |
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return -1; |
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if (fread(buf, sizeof (char), 10, dev) != 10) |
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return -1; |
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1.1.1
by Martin Pitt
Import upstream version 1.1.0 |
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if (!strncmp(buf, "S1SUSPEND", 9) || |
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!strncmp(buf, "ULSUSPEND", 9)) |
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1
by Tim Dijkstra
Import upstream version 0.99.2 |
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return 1; |
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return 0; |
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}
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int clear_resume_block(FILE *dev, off_t offset) |
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{
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char buf[21] = {0,}; |
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off_t location = offset + get_sig_offset(1); |
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if (fseek(dev, location, SEEK_SET) < 0) |
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return -1; |
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if (fread(buf, sizeof (char), 20, dev) != 20) |
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return -1; |
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if (fseek(dev, location, SEEK_SET) < 0) |
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return -1; |
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memmove(buf+10, buf, 10); |
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memset(buf, '\0', 10); |
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if (fwrite(buf, sizeof (char), 20, dev) != 20) |
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return -1; |
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return 0; |
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}
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int main(int argc, char *argv[]) |
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{
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FILE *dev = NULL; |
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int rc; |
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if (argc != 2) |
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return print_usage(stderr, 1); |
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if (!strcmp(argv[1], "--help")) { |
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return print_usage(stdout, 0); |
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}
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if (!(dev = fopen(argv[1], "r+b"))) { |
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fprintf(stderr, "Could not open \"%s\": %m\n", argv[1]); |
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return 1; |
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}
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rc = check_resume_block(dev, 0); |
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if (rc < 0) { |
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fprintf(stderr, "Could not check \"%s\" for swap signature: %m\n", |
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argv[1]); |
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fclose(dev); |
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return 2; |
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}
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1.1.1
by Martin Pitt
Import upstream version 1.1.0 |
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1
by Tim Dijkstra
Import upstream version 0.99.2 |
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if (rc == 1) { |
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if (clear_resume_block(dev, 0)) { |
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fprintf(stderr, "Could not clear swap signature on \"%s\": %m\n", |
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argv[1]); |
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fclose(dev); |
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return 1; |
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}
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}
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fclose(dev); |
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return 0; |
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}
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/*
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* vim:ts=8:sw=4:sts=4:et
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*/
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