Diff of /trunk/mkinitrd-magellan/busybox/util-linux/mkswap.c

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	revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 5	Line 5
5	*	*
6	* Licensed under GPL version 2, see file LICENSE in this tarball for details.	* Licensed under GPL version 2, see file LICENSE in this tarball for details.
7	*/	*/
8	#include "libbb.h"	#include "libbb.h"
9
10	#if ENABLE_SELINUX	#if ENABLE_SELINUX
#	Line 48  static void mkswap_selinux_setcontext(in	Line 47  static void mkswap_selinux_setcontext(in
47	bb_perror_msg_and_die("SELinux relabeling failed");	bb_perror_msg_and_die("SELinux relabeling failed");
48	}	}
49	#else	#else
50	#define mkswap_selinux_setcontext(fd, path) ((void)0)	# define mkswap_selinux_setcontext(fd, path) ((void)0)
51	#endif	#endif
52
53	#if 0 /* from Linux 2.6.23 */	/* from Linux 2.6.23 */
54	/*	/*
55	* Magic header for a swap area. The first part of the union is	* Magic header for a swap area. ... Note that the first
56	* what the swap magic looks like for the old (limited to 128MB)	* kilobyte is reserved for boot loader or disk label stuff.
	* 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...
57	*/	*/
58	union swap_header {	struct swap_header_v1 {
59	struct {	/* char     bootbits[1024];    Space for disklabel etc. */
60	char reserved[PAGE_SIZE - 10];	uint32_t version;        /* second kbyte, word 0 */
61	char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */	uint32_t last_page;      /* 1 */
62	} magic;	uint32_t nr_badpages;    /* 2 */
63	struct {	char     sws_uuid[16];   /* 3,4,5,6 */
64	char            bootbits[1024]; /* Space for disklabel etc. */	char     sws_volume[16]; /* 7,8,9,10 */
65	__u32           version;        /* second kbyte, word 0 */	uint32_t padding[117];   /* 11..127 */
66	__u32           last_page;      /* 1 */	uint32_t badpages[1];    /* 128 */
67	__u32           nr_badpages;    /* 2 */	/* total 129 32-bit words in 2nd kilobyte */
	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;
68	};	};
	#endif
69
70	#define NWORDS 129	#define NWORDS 129
71	#define hdr ((uint32_t*)(&bb_common_bufsiz1))	#define hdr ((struct swap_header_v1*)bb_common_bufsiz1)
72
73	struct BUG_bufsiz1_is_too_small {	struct BUG_sizes {
74	char BUG_bufsiz1_is_too_small[COMMON_BUFSIZE < (NWORDS * 4) ? -1 : 1];	char swap_header_v1_wrong[sizeof(*hdr)  != (NWORDS * 4) ? -1 : 1];
75		char bufsiz1_is_too_small[COMMON_BUFSIZE < (NWORDS * 4) ? -1 : 1];
76	};	};
77
78	/* Stored without terminating NUL */	/* Stored without terminating NUL */
79	static const char SWAPSPACE2[sizeof("SWAPSPACE2")-1] ALIGN1 = "SWAPSPACE2";	static const char SWAPSPACE2[sizeof("SWAPSPACE2")-1] ALIGN1 = "SWAPSPACE2";
80
81	int mkswap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;	int mkswap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
82	int mkswap_main(int argc, char **argv)	int mkswap_main(int argc UNUSED_PARAM, char **argv)
83	{	{
84	int fd, pagesize;	int fd;
85		unsigned pagesize;
86	off_t len;	off_t len;
87		const char *label = "";
88
89	// No options supported.	opt_complementary = "=1";
90		/* TODO: -p PAGESZ, -U UUID,
91		* optional SIZE_IN_KB 2nd param
92		*/
93		getopt32(argv, "L:", &label);
94		argv += optind;
95
96	if (argc != 2) bb_show_usage();	fd = xopen(argv[0], O_WRONLY);
97
98	// Figure out how big the device is and announce our intentions.	/* Figure out how big the device is and announce our intentions */
	fd = xopen(argv[1], O_RDWR);
99	/* fdlength was reported to be unreliable - use seek */	/* fdlength was reported to be unreliable - use seek */
100	len = xlseek(fd, 0, SEEK_END);	len = xlseek(fd, 0, SEEK_END);
101	#if ENABLE_SELINUX	if (ENABLE_SELINUX)
102	xlseek(fd, 0, SEEK_SET);	xlseek(fd, 0, SEEK_SET);
	#endif
	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;
103
104	// Write the header.  Sync to disk because some kernel versions check	pagesize = getpagesize();
105	// signature on disk (not in cache) during swapon.	len -= pagesize;
106		printf("Setting up swapspace version 1, size = %"OFF_FMT"u bytes\n", len);
107		mkswap_selinux_setcontext(fd, argv[0]);
108
109		/* Make a header. hdr is zero-filled so far... */
110		hdr->version = 1;
111		hdr->last_page = (uoff_t)len / pagesize;
112
113		if (ENABLE_FEATURE_MKSWAP_UUID) {
114		char uuid_string[32];
115		generate_uuid((void*)hdr->sws_uuid);
116		bin2hex(uuid_string, hdr->sws_uuid, 16);
117		/* f.e. UUID=dfd9c173-be52-4d27-99a5-c34c6c2ff55f */
118		printf("UUID=%.8s"  "-%.4s-%.4s-%.4s-%.12s\n",
119		uuid_string,
120		uuid_string+8,
121		uuid_string+8+4,
122		uuid_string+8+4+4,
123		uuid_string+8+4+4+4
124		);
125		}
126		safe_strncpy(hdr->sws_volume, label, 16);
127
128		/* Write the header.  Sync to disk because some kernel versions check
129		* signature on disk (not in cache) during swapon. */
130	xlseek(fd, 1024, SEEK_SET);	xlseek(fd, 1024, SEEK_SET);
131	xwrite(fd, hdr, NWORDS * 4);	xwrite(fd, hdr, NWORDS * 4);
132	xlseek(fd, pagesize - 10, SEEK_SET);	xlseek(fd, pagesize - 10, SEEK_SET);
133	xwrite(fd, SWAPSPACE2, 10);	xwrite(fd, SWAPSPACE2, 10);
134	fsync(fd);	fsync(fd);
135
136	if (ENABLE_FEATURE_CLEAN_UP) close(fd);	if (ENABLE_FEATURE_CLEAN_UP)
137		close(fd);
138
139	return 0;	return 0;
140	}	}

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