imsm: add support for checkpointing via 'curr_migr_unit'

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index f09fd843c9aa8bec32aeb0e39da7e6c47e9ba5c2..53c21e3d4369c3ad6346e91760e6206567bf8753 100644 (file)
--- a/util.c
+++ b/util.c
@@ -1,7 +1,7 @@
 /*
  * mdadm - manage Linux "md" devices aka RAID arrays.
  *
- * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
  *
  *
  *    This program is free software; you can redistribute it and/or modify
@@ -19,12 +19,7 @@
  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  *    Author: Neil Brown
- *    Email: <neilb@cse.unsw.edu.au>
- *    Paper: Neil Brown
- *           School of Computer Science and Engineering
- *           The University of New South Wales
- *           Sydney, 2052
- *           Australia
+ *    Email: <neilb@suse.de>
  */
 
 #include       "mdadm.h"
@@ -154,6 +149,73 @@ int get_linux_version()
        return (a*1000000)+(b*1000)+c;
 }
 
+#ifndef MDASSEMBLE
+long long parse_size(char *size)
+{
+       /* parse 'size' which should be a number optionally
+        * followed by 'K', 'M', or 'G'.
+        * Without a suffix, K is assumed.
+        * Number returned is in sectors (half-K)
+        */
+       char *c;
+       long long s = strtoll(size, &c, 10);
+       if (s > 0) {
+               switch (*c) {
+               case 'K':
+                       c++;
+               default:
+                       s *= 2;
+                       break;
+               case 'M':
+                       c++;
+                       s *= 1024 * 2;
+                       break;
+               case 'G':
+                       c++;
+                       s *= 1024 * 1024 * 2;
+                       break;
+               }
+       }
+       if (*c)
+               s = 0;
+       return s;
+}
+
+int parse_layout_10(char *layout)
+{
+       int copies, rv;
+       char *cp;
+       /* Parse the layout string for raid10 */
+       /* 'f', 'o' or 'n' followed by a number <= raid_disks */
+       if ((layout[0] !=  'n' && layout[0] != 'f' && layout[0] != 'o') ||
+           (copies = strtoul(layout+1, &cp, 10)) < 1 ||
+           copies > 200 ||
+           *cp)
+               return -1;
+       if (layout[0] == 'n')
+               rv = 256 + copies;
+       else if (layout[0] == 'o')
+               rv = 0x10000 + (copies<<8) + 1;
+       else
+               rv = 1 + (copies<<8);
+       return rv;
+}
+
+int parse_layout_faulty(char *layout)
+{
+       /* Parse the layout string for 'faulty' */
+       int ln = strcspn(layout, "0123456789");
+       char *m = strdup(layout);
+       int mode;
+       m[ln] = 0;
+       mode = map_name(faultylayout, m);
+       if (mode == UnSet)
+               return -1;
+
+       return mode | (atoi(layout+ln)<< ModeShift);
+}
+#endif
+
 void remove_partitions(int fd)
 {
        /* remove partitions from this block devices.
@@ -199,9 +261,9 @@ int enough(int level, int raid_disks, int layout, int clean,
                } while (first != 0);
                return 1;
 
-       case -4:
+       case LEVEL_MULTIPATH:
                return avail_disks>= 1;
-       case -1:
+       case LEVEL_LINEAR:
        case 0:
                return avail_disks == raid_disks;
        case 1:
@@ -274,17 +336,15 @@ void copy_uuid(void *a, int b[4], int swapuuid)
                memcpy(a, b, 16);
 }
 
-char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
+char *__fname_from_uuid(int id[4], int swap, char *buf, char sep)
 {
        int i, j;
-       int id;
        char uuid[16];
        char *c = buf;
        strcpy(c, "UUID-");
        c += strlen(c);
-       copy_uuid(uuid, info->uuid, st->ss->swapuuid);
+       copy_uuid(uuid, id, swap);
        for (i = 0; i < 4; i++) {
-               id = uuid[i];
                if (i)
                        *c++ = sep;
                for (j = 3; j >= 0; j--) {
@@ -293,6 +353,12 @@ char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char
                }
        }
        return buf;
+
+}
+
+char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
+{
+       return __fname_from_uuid(info->uuid, st->ss->swapuuid, buf, sep);
 }
 
 #ifndef MDASSEMBLE
@@ -868,6 +934,8 @@ void wait_for(char *dev, int fd)
                        return;
                usleep(200000);
        }
+       if (i == 25)
+               dprintf("%s: timeout waiting for %s\n", __func__, dev);
 }
 
 struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
@@ -1094,8 +1162,11 @@ int add_disk(int mdfd, struct supertype *st,
        int rv;
 #ifndef MDASSEMBLE
        if (st->ss->external) {
-               rv = sysfs_add_disk(sra, info,
-                                   info->disk.state & (1<<MD_DISK_SYNC));
+               if (info->disk.state & (1<<MD_DISK_SYNC))
+                       info->recovery_start = MaxSector;
+               else
+                       info->recovery_start = 0;
+               rv = sysfs_add_disk(sra, info, 0);
                if (! rv) {
                        struct mdinfo *sd2;
                        for (sd2 = sra->devs; sd2; sd2=sd2->next)
@@ -1139,10 +1210,25 @@ int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
        return rv;
 }
 
+unsigned long long min_recovery_start(struct mdinfo *array)
+{
+       /* find the minimum recovery_start in an array for metadata
+        * formats that only record per-array recovery progress instead
+        * of per-device
+        */
+       unsigned long long recovery_start = MaxSector;
+       struct mdinfo *d;
+
+       for (d = array->devs; d; d = d->next)
+               recovery_start = min(recovery_start, d->recovery_start);
+
+       return recovery_start;
+}
+
 char *devnum2devname(int num)
 {
        char name[100];
-       if (num > 0)
+       if (num >= 0)
                sprintf(name, "md%d", num);
        else
                sprintf(name, "md_d%d", -1-num);
@@ -1303,6 +1389,17 @@ int check_env(char *name)
        return 0;
 }
 
+__u32 random32(void)
+{
+       __u32 rv;
+       int rfd = open("/dev/urandom", O_RDONLY);
+       if (rfd < 0 || read(rfd, &rv, 4) != 4)
+               rv = random();
+       if (rfd >= 0)
+               close(rfd);
+       return rv;
+}
+
 #ifndef MDASSEMBLE
 int flush_metadata_updates(struct supertype *st)
 {