/*
* Public include file for the UUID library
- *
- * Copyright (C) 1996, 1997, 1998 Theodore Ts'o.
- * Copyright (C) 2002 Cluster File System
- * - changed for use in lustre
*
- * %Begin-Header%
- * This file may be redistributed under the terms of the GNU
- * Library General Public License.
- * %End-Header%
+ * Copyright (C) 2007 Cluster File System
*/
+
#define DEBUG_SUBSYSTEM S_CLASS
#ifndef __KERNEL__
# include <liblustre.h>
+#else
+# include <libcfs/kp30.h>
#endif
#include <obd_support.h>
#include <obd_class.h>
-struct uuid {
- __u32 time_low;
- __u16 time_mid;
- __u16 time_hi_and_version;
- __u16 clock_seq;
- __u8 node[6];
-};
-
-static void uuid_unpack(class_uuid_t in, struct uuid *uu)
-{
- __u8 *ptr = in;
- __u32 tmp;
-
- tmp = *ptr++;
- tmp = (tmp << 8) | *ptr++;
- tmp = (tmp << 8) | *ptr++;
- tmp = (tmp << 8) | *ptr++;
- uu->time_low = tmp;
-
- tmp = *ptr++;
- tmp = (tmp << 8) | *ptr++;
- uu->time_mid = tmp;
-
- tmp = *ptr++;
- tmp = (tmp << 8) | *ptr++;
- uu->time_hi_and_version = tmp;
-
- tmp = *ptr++;
- tmp = (tmp << 8) | *ptr++;
- uu->clock_seq = tmp;
-
- memcpy(uu->node, ptr, 6);
-}
-
-#if 0
-static void uuid_pack(struct uuid *uu, class_uuid_t ptr)
-{
- __u32 tmp;
- unsigned char *out = ptr;
-
- tmp = uu->time_low;
- out[3] = (unsigned char) tmp;
- tmp >>= 8;
- out[2] = (unsigned char) tmp;
- tmp >>= 8;
- out[1] = (unsigned char) tmp;
- tmp >>= 8;
- out[0] = (unsigned char) tmp;
-
- tmp = uu->time_mid;
- out[5] = (unsigned char) tmp;
- tmp >>= 8;
- out[4] = (unsigned char) tmp;
-
- tmp = uu->time_hi_and_version;
- out[7] = (unsigned char) tmp;
- tmp >>= 8;
- out[6] = (unsigned char) tmp;
-
- tmp = uu->clock_seq;
- out[9] = (unsigned char) tmp;
- tmp >>= 8;
- out[8] = (unsigned char) tmp;
-
- memcpy(out+10, uu->node, 6);
-}
-int class_uuid_parse(struct obd_uuid in, class_uuid_t uu)
+static inline __u32 consume(int nob, __u8 **ptr)
{
- struct uuid uuid;
- int i;
- char *cp, buf[3];
+ __u32 value;
- if (strlen(in) != 36)
- return -1;
- for (i=0, cp = in; i <= 36; i++,cp++) {
- if ((i == 8) || (i == 13) || (i == 18) ||
- (i == 23))
- if (*cp == '-')
- continue;
- if (i== 36)
- if (*cp == 0)
- continue;
- if (!isxdigit(*cp))
- return -1;
- }
- uuid.time_low = simple_strtoul(in, NULL, 16);
- uuid.time_mid = simple_strtoul(in+9, NULL, 16);
- uuid.time_hi_and_version = simple_strtoul(in+14, NULL, 16);
- uuid.clock_seq = simple_strtoul(in+19, NULL, 16);
- cp = in+24;
- buf[2] = 0;
- for (i=0; i < 6; i++) {
- buf[0] = *cp++;
- buf[1] = *cp++;
- uuid.node[i] = simple_strtoul(buf, NULL, 16);
- }
+ LASSERT(nob <= sizeof value);
- uuid_pack(&uuid, uu);
- return 0;
+ for (value = 0; nob > 0; --nob)
+ value = (value << 8) | *((*ptr)++);
+ return value;
}
-#endif
-
-void generate_random_uuid(unsigned char uuid_out[16]);
+#define CONSUME(val, ptr) (val) = consume(sizeof(val), (ptr))
-/* We need to have some extra twiddling here because some systems have
- * no random state when they start up. */
-void class_generate_random_uuid(class_uuid_t uuid)
+static void uuid_unpack(class_uuid_t in, __u16 *uu, int nr)
{
- struct timeval t;
- int *i, j, k;
-
- LASSERT(sizeof(class_uuid_t) % sizeof(*i) == 0);
+ __u8 *ptr = in;
- j = jiffies;
- do_gettimeofday(&t);
- k = t.tv_usec;
+ LASSERT(nr * sizeof *uu == sizeof(class_uuid_t));
- generate_random_uuid(uuid);
-
- for (i = (int *)uuid; (char *)i < (char *)uuid + sizeof(class_uuid_t); i++) {
- *i ^= j ^ k;
- j = ((j << 8) & 0xffffff00) | ((j >> 24) & 0x000000ff);
- k = ((k >> 8) & 0x00ffffff) | ((k << 24) & 0xff000000);
- }
+ while (nr-- > 0)
+ CONSUME(uu[nr], &ptr);
}
void class_uuid_unparse(class_uuid_t uu, struct obd_uuid *out)
{
- struct uuid uuid;
+ /* uu as an array of __u16's */
+ __u16 uuid[sizeof(class_uuid_t) / sizeof(__u16)];
+
+ CLASSERT(ARRAY_SIZE(uuid) == 8);
- uuid_unpack(uu, &uuid);
- sprintf(out->uuid,
- "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
- uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
- uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
- uuid.node[0], uuid.node[1], uuid.node[2],
- uuid.node[3], uuid.node[4], uuid.node[5]);
+ uuid_unpack(uu, uuid, ARRAY_SIZE(uuid));
+ sprintf(out->uuid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
+ uuid[0], uuid[1], uuid[2], uuid[3],
+ uuid[4], uuid[5], uuid[6], uuid[7]);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff