*
* Copyright 2006 Rob Landley <rob@landley.net>
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-
#include "libbb.h"
#if ENABLE_SELINUX
if (!is_selinux_enabled())
return;
- if (fstat(fd, &stbuf) < 0)
- bb_perror_msg_and_die("fstat failed");
+ xfstat(fd, &stbuf, argv[0]);
if (S_ISREG(stbuf.st_mode)) {
security_context_t newcon;
security_context_t oldcon = NULL;
bb_perror_msg_and_die("SELinux relabeling failed");
}
#else
-#define mkswap_selinux_setcontext(fd, path) ((void)0)
+# define mkswap_selinux_setcontext(fd, path) ((void)0)
#endif
-#if 0 /* from Linux 2.6.23 */
+/* from Linux 2.6.23 */
/*
- * Magic header for a swap area. The first part of the union is
- * what the swap magic looks like for the old (limited to 128MB)
- * swap area format, the second part of the union adds - in the
- * old reserved area - some extra information. Note that the first
- * kilobyte is reserved for boot loader or disk label stuff...
+ * Magic header for a swap area. ... Note that the first
+ * kilobyte is reserved for boot loader or disk label stuff.
*/
-union swap_header {
- struct {
- char reserved[PAGE_SIZE - 10];
- char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */
- } magic;
- struct {
- char bootbits[1024]; /* Space for disklabel etc. */
- __u32 version; /* second kbyte, word 0 */
- __u32 last_page; /* 1 */
- __u32 nr_badpages; /* 2 */
- unsigned char sws_uuid[16]; /* 3,4,5,6 */
- unsigned char sws_volume[16]; /* 7,8,9,10 */
- __u32 padding[117]; /* 11..127 */
- __u32 badpages[1]; /* 128, total 129 32-bit words */
- } info;
-};
-#endif
+struct swap_header_v1 {
+/* char bootbits[1024]; Space for disklabel etc. */
+ uint32_t version; /* second kbyte, word 0 */
+ uint32_t last_page; /* 1 */
+ uint32_t nr_badpages; /* 2 */
+ char sws_uuid[16]; /* 3,4,5,6 */
+ char sws_volume[16]; /* 7,8,9,10 */
+ uint32_t padding[117]; /* 11..127 */
+ uint32_t badpages[1]; /* 128 */
+ /* total 129 32-bit words in 2nd kilobyte */
+} FIX_ALIASING;
#define NWORDS 129
-#define hdr ((uint32_t*)(&bb_common_bufsiz1))
+#define hdr ((struct swap_header_v1*)bb_common_bufsiz1)
-struct BUG_bufsiz1_is_too_small {
- char BUG_bufsiz1_is_too_small[COMMON_BUFSIZE < (NWORDS * 4) ? -1 : 1];
+struct BUG_sizes {
+ char swap_header_v1_wrong[sizeof(*hdr) != (NWORDS * 4) ? -1 : 1];
+ char bufsiz1_is_too_small[COMMON_BUFSIZE < (NWORDS * 4) ? -1 : 1];
};
/* Stored without terminating NUL */
static const char SWAPSPACE2[sizeof("SWAPSPACE2")-1] ALIGN1 = "SWAPSPACE2";
int mkswap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int mkswap_main(int argc, char **argv)
+int mkswap_main(int argc UNUSED_PARAM, char **argv)
{
- int fd, pagesize;
+ int fd;
+ unsigned pagesize;
off_t len;
+ const char *label = "";
- // No options supported.
+ opt_complementary = "-1"; /* at least one param */
+ /* TODO: -p PAGESZ, -U UUID */
+ getopt32(argv, "L:", &label);
+ argv += optind;
- if (argc != 2) bb_show_usage();
+ fd = xopen(argv[0], O_WRONLY);
- // Figure out how big the device is and announce our intentions.
-
- fd = xopen(argv[1], O_RDWR);
- /* fdlength was reported to be unreliable - use seek */
- len = xlseek(fd, 0, SEEK_END);
-#if ENABLE_SELINUX
- xlseek(fd, 0, SEEK_SET);
-#endif
+ /* Figure out how big the device is */
+ len = get_volume_size_in_bytes(fd, argv[1], 1024, /*extend:*/ 1);
pagesize = getpagesize();
- printf("Setting up swapspace version 1, size = %"OFF_FMT"u bytes\n",
- len - pagesize);
- mkswap_selinux_setcontext(fd, argv[1]);
-
- // Make a header. hdr is zero-filled so far...
- hdr[0] = 1;
- hdr[1] = (len / pagesize) - 1;
-
- // Write the header. Sync to disk because some kernel versions check
- // signature on disk (not in cache) during swapon.
+ len -= pagesize;
+
+ /* Announce our intentions */
+ printf("Setting up swapspace version 1, size = %"OFF_FMT"u bytes\n", len);
+ mkswap_selinux_setcontext(fd, argv[0]);
+
+ /* hdr is zero-filled so far. Clear the first kbyte, or else
+ * mkswap-ing former FAT partition does NOT erase its signature.
+ *
+ * util-linux-ng 2.17.2 claims to erase it only if it does not see
+ * a partition table and is not run on whole disk. -f forces it.
+ */
+ xwrite(fd, hdr, 1024);
+
+ /* Fill the header. */
+ hdr->version = 1;
+ hdr->last_page = (uoff_t)len / pagesize;
+
+ if (ENABLE_FEATURE_MKSWAP_UUID) {
+ char uuid_string[32];
+ generate_uuid((void*)hdr->sws_uuid);
+ bin2hex(uuid_string, hdr->sws_uuid, 16);
+ /* f.e. UUID=dfd9c173-be52-4d27-99a5-c34c6c2ff55f */
+ printf("UUID=%.8s" "-%.4s-%.4s-%.4s-%.12s\n",
+ uuid_string,
+ uuid_string+8,
+ uuid_string+8+4,
+ uuid_string+8+4+4,
+ uuid_string+8+4+4+4
+ );
+ }
+ safe_strncpy(hdr->sws_volume, label, 16);
- xlseek(fd, 1024, SEEK_SET);
+ /* Write the header. Sync to disk because some kernel versions check
+ * signature on disk (not in cache) during swapon. */
xwrite(fd, hdr, NWORDS * 4);
xlseek(fd, pagesize - 10, SEEK_SET);
xwrite(fd, SWAPSPACE2, 10);
fsync(fd);
- if (ENABLE_FEATURE_CLEAN_UP) close(fd);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
return 0;
}
projects / oweals / busybox.git / blobdiff