- shrink mkswap and make v0 support optional. Thanks also to Tito for his ideas.
http://busybox.net/lists/busybox/2006-March/019326.html 2137 8 28 2173 87d util-linux/mkswap.o.orig 1890 8 28 1926 786 util-linux/mkswap.o.v0+v1 1560 4 28 1592 638 util-linux/mkswap.o.v1
This commit is contained in:
Bernhard Reutner-Fischer
parent
b256bd334f
commit
56dd0bff06
@ -288,6 +288,16 @@ config CONFIG_MKSWAP
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Once you have created swap space using 'mkswap' you need to enable
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the swap space using the 'swapon' utility.
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config CONFIG_FEATURE_MKSWAP_V0
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bool " version 0 support"
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default n
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depends on CONFIG_MKSWAP
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# depends on CONFIG_MKSWAP && CONFIG_DEPRECATED
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help
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Enable support for the old v0 style.
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If your kernel is older than 2.1.117, then v0 support is the
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only option.
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config CONFIG_MORE
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bool "more"
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default n
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@ -59,9 +59,17 @@ static int DEV = -1;
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static long PAGES = 0;
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static int check = 0;
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static int badpages = 0;
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#if ENABLE_FEATURE_MKSWAP_V0
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static int version = -1;
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#define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r))
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#else
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#define version 1
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/* and make sure that we optimize away anything which would deal with checking
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* the kernel revision as we have v1 support only anyway.
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*/
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#define MAKE_VERSION(p,q,r) 1
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#define get_kernel_revision() 1
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#endif
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/*
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* The definition of the union swap_header uses the constant PAGE_SIZE.
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@ -74,7 +82,7 @@ static unsigned int *signature_page;
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static struct swap_header_v1 {
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char bootbits[1024]; /* Space for disklabel etc. */
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unsigned int version;
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unsigned int swap_version;
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unsigned int last_page;
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unsigned int nr_badpages;
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unsigned int padding[125];
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@ -172,23 +180,11 @@ static int bit_test_and_clear(unsigned int *addr, unsigned int nr)
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return (r & m) != 0;
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}
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static void page_ok(int page)
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{
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if (version == 0)
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if (ENABLE_FEATURE_MKSWAP_V0) {
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bit_set(signature_page, page);
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}
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static inline void page_bad(int page)
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{
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if (version == 0)
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bit_test_and_clear(signature_page, page);
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else {
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if (badpages == MAX_BADPAGES)
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bb_error_msg_and_die("too many bad pages");
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p->badpages[badpages] = page;
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}
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badpages++;
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}
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static void check_blocks(void)
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@ -200,7 +196,7 @@ static void check_blocks(void)
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buffer = xmalloc(pagesize);
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current_page = 0;
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while (current_page < PAGES) {
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if (!check) {
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if (!check && version == 0) {
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page_ok(current_page++);
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continue;
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}
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@ -208,15 +204,23 @@ static void check_blocks(void)
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current_page * pagesize)
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bb_error_msg_and_die("seek failed in check_blocks");
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if ((do_seek = (pagesize != read(DEV, buffer, pagesize)))) {
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page_bad(current_page++);
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current_page++;
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if (version == 0)
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bit_test_and_clear(signature_page, current_page);
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else {
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if (badpages == MAX_BADPAGES)
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bb_error_msg_and_die("too many bad pages");
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p->badpages[badpages] = current_page;
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}
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badpages++;
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continue;
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}
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page_ok(current_page++);
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}
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if (badpages == 1)
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printf("one bad page\n");
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else if (badpages > 1)
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printf("%d bad pages\n", badpages);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(buffer);
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if (badpages > 0)
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printf("%d bad page%s\n", badpages, (badpages==1)?"":"s");
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}
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static long valid_offset(int fd, int offset)
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@ -249,17 +253,15 @@ static int find_size(int fd)
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}
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/* return size in pages, to avoid integer overflow */
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static long get_size(const char *file)
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static inline long get_size(const char *file)
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{
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int fd;
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long size;
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if ((fd = open(file, O_RDONLY)) < 0)
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if ((fd = open(file, O_RDONLY)) < 0) /* TODO: bb_xopen3 */
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bb_perror_msg_and_die("%s", file);
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if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
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int sectors_per_page = pagesize / 512;
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size /= sectors_per_page;
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size /= pagesize / 512;
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} else {
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size = find_size(fd) / pagesize;
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}
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@ -274,66 +276,53 @@ int mkswap_main(int argc, char **argv)
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int sz;
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int maxpages;
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int goodpages;
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int offset;
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#ifdef __sparc__
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int force = 0;
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#endif
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init_signature_page(); /* get pagesize */
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while (argc-- > 1) {
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argv++;
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if (argv[0][0] != '-') {
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if (device_name) {
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int blocks_per_page = pagesize / 1024;
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PAGES = strtol(argv[0], &tmp, 0) / blocks_per_page;
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if (*tmp)
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bb_show_usage();
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} else
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device_name = argv[0];
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} else {
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switch (argv[0][1]) {
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case 'c':
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check = 1;
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break;
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case 'f':
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force = 1;
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break;
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case 'v':
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version = atoi(argv[0] + 2);
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break;
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default:
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bb_show_usage();
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}
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}
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}
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if (!device_name) {
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bb_error_msg("error: Nowhere to set up swap on?");
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bb_show_usage();
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}
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sz = get_size(device_name);
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if (!PAGES) {
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PAGES = sz;
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} else if (PAGES > sz && !force) {
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bb_error_msg("error: size %ld is larger than device size %d",
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PAGES * (pagesize / 1024), sz * (pagesize / 1024));
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return EXIT_FAILURE;
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}
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if (version == -1) {
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bb_opt_complementally = "?"; /* call bb_show_usage internally */
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sz = bb_getopt_ulflags(argc, argv, "+cfv:", &tmp);
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if (sz & 1)
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check = 1;
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#ifdef __sparc__
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if (sz & 2)
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force = 1;
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#endif
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#if ENABLE_FEATURE_MKSWAP_V0
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if (sz & 4) {
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version = bb_xgetlarg(tmp, 10, 0, 1);
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} else {
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if (get_kernel_revision() < MAKE_VERSION(2, 1, 117))
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version = 0;
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else
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version = 1;
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}
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if (version != 0 && version != 1) {
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bb_error_msg("error: unknown version %d", version);
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bb_show_usage();
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#endif
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argv += optind;
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argc -= optind;
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goodpages = pagesize / 1024; /* cache division */
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while (argc--) {
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if (device_name) {
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PAGES = bb_xgetlarg(argv[0], 0, 10, sz * goodpages) / goodpages;
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argc = 0; /* ignore any surplus args.. */
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} else {
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device_name = argv[0];
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sz = get_size(device_name);
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argv++;
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}
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}
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if (PAGES < 10) {
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bb_error_msg("error: swap area needs to be at least %ldkB",
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(long) (10 * pagesize / 1024));
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bb_show_usage();
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if (!device_name) {
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bb_error_msg_and_die("error: Nowhere to set up swap on?");
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}
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if (!PAGES) {
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PAGES = sz;
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}
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#if 0
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maxpages = ((version == 0) ? V0_MAX_PAGES : V1_MAX_PAGES);
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#else
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@ -350,7 +339,7 @@ int mkswap_main(int argc, char **argv)
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if (PAGES > maxpages) {
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PAGES = maxpages;
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bb_error_msg("warning: truncating swap area to %ldkB",
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PAGES * pagesize / 1024);
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PAGES * goodpages);
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}
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DEV = open(device_name, O_RDWR);
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@ -389,7 +378,7 @@ int mkswap_main(int argc, char **argv)
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if (version == 0 && !bit_test_and_clear(signature_page, 0))
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bb_error_msg_and_die("fatal: first page unreadable");
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if (version == 1) {
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p->version = version;
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p->swap_version = version;
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p->last_page = PAGES - 1;
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p->nr_badpages = badpages;
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}
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@ -401,11 +390,12 @@ int mkswap_main(int argc, char **argv)
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version, (long) (goodpages * pagesize));
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write_signature((version == 0) ? "SWAP-SPACE" : "SWAPSPACE2");
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offset = ((version == 0) ? 0 : 1024);
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if (lseek(DEV, offset, SEEK_SET) != offset)
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sz = ((version == 0) ? 0 : 1024); /* offset */
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if (lseek(DEV, sz, SEEK_SET) != sz)
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bb_error_msg_and_die("unable to rewind swap-device");
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if (write(DEV, (char *) signature_page + offset, pagesize - offset)
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!= pagesize - offset)
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goodpages = pagesize - sz; /* cache substraction */
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if (write(DEV, (char *) signature_page + sz, goodpages)
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!= goodpages)
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bb_error_msg_and_die("unable to write signature page");
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/*
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@ -414,5 +404,9 @@ int mkswap_main(int argc, char **argv)
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*/
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if (fsync(DEV))
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bb_error_msg_and_die("fsync failed");
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(DEV);
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free(signature_page);
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}
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return EXIT_SUCCESS;
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}
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