-
-static int pagesize;
-static int *signature_page;
-
-struct swap_header_v1 {
- char bootbits[1024]; /* Space for disklabel etc. */
- unsigned int version;
- unsigned int last_page;
- unsigned int nr_badpages;
- unsigned int padding[125];
- unsigned int badpages[1];
-} *p;
-
-static void init_signature_page()
-{
- pagesize = getpagesize();
-
-#ifdef PAGE_SIZE
- if (pagesize != PAGE_SIZE)
- errorMsg("Assuming pages of size %d\n", pagesize);
-#endif
- signature_page = (int *) xmalloc(pagesize);
- memset(signature_page, 0, pagesize);
- p = (struct swap_header_v1 *) signature_page;
-}
-
-static void write_signature(char *sig)
-{
- char *sp = (char *) signature_page;
-
- strncpy(sp + pagesize - 10, sig, 10);
-}
-
-#define V0_MAX_PAGES (8 * (pagesize - 10))
-/* Before 2.2.0pre9 */
-#define V1_OLD_MAX_PAGES ((0x7fffffff / pagesize) - 1)
-/* Since 2.2.0pre9:
- error if nr of pages >= SWP_OFFSET(SWP_ENTRY(0,~0UL))
- with variations on
- #define SWP_ENTRY(type,offset) (((type) << 1) | ((offset) << 8))
- #define SWP_OFFSET(entry) ((entry) >> 8)
- on the various architectures. Below the result - yuk.
-
- Machine pagesize SWP_ENTRY SWP_OFFSET bound+1 oldbound+2
- i386 2^12 o<<8 e>>8 1<<24 1<<19
- mips 2^12 o<<15 e>>15 1<<17 1<<19
- alpha 2^13 o<<40 e>>40 1<<24 1<<18
- m68k 2^12 o<<12 e>>12 1<<20 1<<19
- sparc 2^{12,13} (o&0x3ffff)<<9 (e>>9)&0x3ffff 1<<18 1<<{19,18}
- sparc64 2^13 o<<13 e>>13 1<<51 1<<18
- ppc 2^12 o<<8 e>>8 1<<24 1<<19
- armo 2^{13,14,15} o<<8 e>>8 1<<24 1<<{18,17,16}
- armv 2^12 o<<9 e>>9 1<<23 1<<19
-
- assuming that longs have 64 bits on alpha and sparc64 and 32 bits elsewhere.
-
- The bad part is that we need to know this since the kernel will
- refuse a swap space if it is too large.
-*/
-/* patch from jj - why does this differ from the above? */
-#if defined(__alpha__)
-#define V1_MAX_PAGES ((1 << 24) - 1)
-#elif defined(__mips__)
-#define V1_MAX_PAGES ((1 << 17) - 1)
-#elif defined(__sparc_v9__)
-#define V1_MAX_PAGES ((3 << 29) - 1)
-#elif defined(__sparc__)
-#define V1_MAX_PAGES (pagesize == 8192 ? ((3 << 29) - 1) : ((1 << 18) - 1))
-#else
-#define V1_MAX_PAGES V1_OLD_MAX_PAGES
+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;
+};