Add crc32 files.
[thirdparty/mdadm.git] / super1.c
1 /*
2  * mdadm - manage Linux "md" devices aka RAID arrays.
3  *
4  * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5  *
6  *
7  *    This program is free software; you can redistribute it and/or modify
8  *    it under the terms of the GNU General Public License as published by
9  *    the Free Software Foundation; either version 2 of the License, or
10  *    (at your option) any later version.
11  *
12  *    This program is distributed in the hope that it will be useful,
13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *    GNU General Public License for more details.
16  *
17  *    You should have received a copy of the GNU General Public License
18  *    along with this program; if not, write to the Free Software
19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  *
21  *    Author: Neil Brown
22  *    Email: <neilb@cse.unsw.edu.au>
23  *    Paper: Neil Brown
24  *           School of Computer Science and Engineering
25  *           The University of New South Wales
26  *           Sydney, 2052
27  *           Australia
28  */
29
30 #include "mdadm.h"
31 /*
32  * The version-1 superblock :
33  * All numeric fields are little-endian.
34  *
35  * total size: 256 bytes plus 2 per device.
36  *  1K allows 384 devices.
37  */
38 struct mdp_superblock_1 {
39         /* constant array information - 128 bytes */
40         __u32   magic;          /* MD_SB_MAGIC: 0xa92b4efc - little endian */
41         __u32   major_version;  /* 1 */
42         __u32   feature_map;    /* 0 for now */
43         __u32   pad0;           /* always set to 0 when writing */
44
45         __u8    set_uuid[16];   /* user-space generated. */
46         char    set_name[32];   /* set and interpreted by user-space */
47
48         __u64   ctime;          /* lo 40 bits are seconds, top 24 are microseconds or 0*/
49         __u32   level;          /* -4 (multipath), -1 (linear), 0,1,4,5 */
50         __u32   layout;         /* only for raid5 currently */
51         __u64   size;           /* used size of component devices, in 512byte sectors */
52
53         __u32   chunksize;      /* in 512byte sectors */
54         __u32   raid_disks;
55         __u32   bitmap_offset;  /* sectors after start of superblock that bitmap starts
56                                  * NOTE: signed, so bitmap can be before superblock
57                                  * only meaningful of feature_map[0] is set.
58                                  */
59
60         /* These are only valid with feature bit '4' */
61         __u32   new_level;      /* new level we are reshaping to                */
62         __u64   reshape_position;       /* next address in array-space for reshape */
63         __u32   delta_disks;    /* change in number of raid_disks               */
64         __u32   new_layout;     /* new layout                                   */
65         __u32   new_chunk;      /* new chunk size (bytes)                       */
66         __u8    pad1[128-124];  /* set to 0 when written */
67
68         /* constant this-device information - 64 bytes */
69         __u64   data_offset;    /* sector start of data, often 0 */
70         __u64   data_size;      /* sectors in this device that can be used for data */
71         __u64   super_offset;   /* sector start of this superblock */
72         __u64   recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
73         __u32   dev_number;     /* permanent identifier of this  device - not role in raid */
74         __u32   cnt_corrected_read; /* number of read errors that were corrected by re-writing */
75         __u8    device_uuid[16]; /* user-space setable, ignored by kernel */
76         __u8    devflags;        /* per-device flags.  Only one defined...*/
77 #define WriteMostly1    1        /* mask for writemostly flag in above */
78         __u8    pad2[64-57];    /* set to 0 when writing */
79
80         /* array state information - 64 bytes */
81         __u64   utime;          /* 40 bits second, 24 btes microseconds */
82         __u64   events;         /* incremented when superblock updated */
83         __u64   resync_offset;  /* data before this offset (from data_offset) known to be in sync */
84         __u32   sb_csum;        /* checksum upto devs[max_dev] */
85         __u32   max_dev;        /* size of devs[] array to consider */
86         __u8    pad3[64-32];    /* set to 0 when writing */
87
88         /* device state information. Indexed by dev_number.
89          * 2 bytes per device
90          * Note there are no per-device state flags. State information is rolled
91          * into the 'roles' value.  If a device is spare or faulty, then it doesn't
92          * have a meaningful role.
93          */
94         __u16   dev_roles[0];   /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
95 };
96
97 struct misc_dev_info {
98         __u64 device_size;
99 };
100
101 /* feature_map bits */
102 #define MD_FEATURE_BITMAP_OFFSET        1
103 #define MD_FEATURE_RECOVERY_OFFSET      2 /* recovery_offset is present and
104                                            * must be honoured
105                                            */
106 #define MD_FEATURE_RESHAPE_ACTIVE       4
107
108 #define MD_FEATURE_ALL                  (1|2|4)
109
110 #ifndef offsetof
111 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
112 #endif
113 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
114 {
115         unsigned int disk_csum, csum;
116         unsigned long long newcsum;
117         int size = sizeof(*sb) + __le32_to_cpu(sb->max_dev)*2;
118         unsigned int *isuper = (unsigned int*)sb;
119         int i;
120
121 /* make sure I can count... */
122         if (offsetof(struct mdp_superblock_1,data_offset) != 128 ||
123             offsetof(struct mdp_superblock_1, utime) != 192 ||
124             sizeof(struct mdp_superblock_1) != 256) {
125                 fprintf(stderr, "WARNING - superblock isn't sized correctly\n");
126         }
127
128         disk_csum = sb->sb_csum;
129         sb->sb_csum = 0;
130         newcsum = 0;
131         for (i=0; size>=4; size -= 4 ) {
132                 newcsum += __le32_to_cpu(*isuper);
133                 isuper++;
134         }
135
136         if (size == 2)
137                 newcsum += __le16_to_cpu(*(unsigned short*) isuper);
138
139         csum = (newcsum & 0xffffffff) + (newcsum >> 32);
140         sb->sb_csum = disk_csum;
141         return __cpu_to_le32(csum);
142 }
143
144 #ifndef MDASSEMBLE
145 static void examine_super1(struct supertype *st, char *homehost)
146 {
147         struct mdp_superblock_1 *sb = st->sb;
148         time_t atime;
149         int d;
150         int faulty;
151         int i;
152         char *c;
153         int l = homehost ? strlen(homehost) : 0;
154         int layout;
155         unsigned long long sb_offset;
156
157         printf("          Magic : %08x\n", __le32_to_cpu(sb->magic));
158         printf("        Version : 1");
159         sb_offset = __le64_to_cpu(sb->super_offset);
160         if (sb_offset <= 4)
161                 printf(".1\n");
162         else if (sb_offset <= 8)
163                 printf(".2\n");
164         else
165                 printf(".0\n");
166         printf("    Feature Map : 0x%x\n", __le32_to_cpu(sb->feature_map));
167         printf("     Array UUID : ");
168         for (i=0; i<16; i++) {
169                 if ((i&3)==0 && i != 0) printf(":");
170                 printf("%02x", sb->set_uuid[i]);
171         }
172         printf("\n");
173         printf("           Name : %.32s", sb->set_name);
174         if (l > 0 && l < 32 &&
175             sb->set_name[l] == ':' &&
176             strncmp(sb->set_name, homehost, l) == 0)
177                 printf("  (local to host %s)", homehost);
178         printf("\n");
179         atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
180         printf("  Creation Time : %.24s\n", ctime(&atime));
181         c=map_num(pers, __le32_to_cpu(sb->level));
182         printf("     Raid Level : %s\n", c?c:"-unknown-");
183         printf("   Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
184         printf("\n");
185         printf(" Avail Dev Size : %llu%s\n",
186                (unsigned long long)__le64_to_cpu(sb->data_size),
187                human_size(__le64_to_cpu(sb->data_size)<<9));
188         if (__le32_to_cpu(sb->level) >= 0) {
189                 int ddsks=0;
190                 switch(__le32_to_cpu(sb->level)) {
191                 case 1: ddsks=1;break;
192                 case 4:
193                 case 5: ddsks = __le32_to_cpu(sb->raid_disks)-1; break;
194                 case 6: ddsks = __le32_to_cpu(sb->raid_disks)-2; break;
195                 case 10:
196                         layout = __le32_to_cpu(sb->layout);
197                         ddsks = __le32_to_cpu(sb->raid_disks)
198                                  / (layout&255) / ((layout>>8)&255);
199                 }
200                 if (ddsks)
201                         printf("     Array Size : %llu%s\n",
202                                ddsks*(unsigned long long)__le64_to_cpu(sb->size),
203                                human_size(ddsks*__le64_to_cpu(sb->size)<<9));
204                 if (sb->size != sb->data_size)
205                         printf("  Used Dev Size : %llu%s\n",
206                                (unsigned long long)__le64_to_cpu(sb->size),
207                                human_size(__le64_to_cpu(sb->size)<<9));
208         }
209         if (sb->data_offset)
210                 printf("    Data Offset : %llu sectors\n",
211                        (unsigned long long)__le64_to_cpu(sb->data_offset));
212         printf("   Super Offset : %llu sectors\n",
213                (unsigned long long)__le64_to_cpu(sb->super_offset));
214         if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)
215                 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->recovery_offset));
216         printf("          State : %s\n", (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
217         printf("    Device UUID : ");
218         for (i=0; i<16; i++) {
219                 if ((i&3)==0 && i != 0) printf(":");
220                 printf("%02x", sb->device_uuid[i]);
221         }
222         printf("\n");
223         printf("\n");
224         if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
225                 printf("Internal Bitmap : %ld sectors from superblock\n",
226                        (long)(int32_t)__le32_to_cpu(sb->bitmap_offset));
227         }
228         if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
229                 printf("  Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb->reshape_position)/2,
230                        human_size(__le64_to_cpu(sb->reshape_position)<<9));
231                 if (__le32_to_cpu(sb->delta_disks)) {
232                         printf("  Delta Devices : %d", __le32_to_cpu(sb->delta_disks));
233                         if (__le32_to_cpu(sb->delta_disks))
234                                 printf(" (%d->%d)\n",
235                                        __le32_to_cpu(sb->raid_disks)-__le32_to_cpu(sb->delta_disks),
236                                        __le32_to_cpu(sb->raid_disks));
237                         else
238                                 printf(" (%d->%d)\n", __le32_to_cpu(sb->raid_disks),
239                                        __le32_to_cpu(sb->raid_disks)+__le32_to_cpu(sb->delta_disks));
240                 }
241                 if (__le32_to_cpu(sb->new_level) != __le32_to_cpu(sb->level)) {
242                         c = map_num(pers, __le32_to_cpu(sb->new_level));
243                         printf("      New Level : %s\n", c?c:"-unknown-");
244                 }
245                 if (__le32_to_cpu(sb->new_layout) != __le32_to_cpu(sb->layout)) {
246                         if (__le32_to_cpu(sb->level) == 5) {
247                                 c = map_num(r5layout, __le32_to_cpu(sb->new_layout));
248                                 printf("     New Layout : %s\n", c?c:"-unknown-");
249                         }
250                         if (__le32_to_cpu(sb->level) == 10) {
251                                 printf("     New Layout : near=%d, %s=%d\n",
252                                        __le32_to_cpu(sb->new_layout)&255,
253                                        (__le32_to_cpu(sb->new_layout)&0x10000)?"offset":"far",
254                                        (__le32_to_cpu(sb->new_layout)>>8)&255);
255                         }
256                 }
257                 if (__le32_to_cpu(sb->new_chunk) != __le32_to_cpu(sb->chunksize))
258                         printf("  New Chunksize : %dK\n", __le32_to_cpu(sb->new_chunk)/2);
259                 printf("\n");
260         }
261         if (sb->devflags) {
262                 printf("      Flags :");
263                 if (sb->devflags & WriteMostly1)
264                         printf(" write-mostly");
265                 printf("\n");
266         }
267
268         atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
269         printf("    Update Time : %.24s\n", ctime(&atime));
270
271         if (calc_sb_1_csum(sb) == sb->sb_csum)
272                 printf("       Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
273         else
274                 printf("       Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
275                        __le32_to_cpu(calc_sb_1_csum(sb)));
276         printf("         Events : %llu\n", (unsigned long long)__le64_to_cpu(sb->events));
277         printf("\n");
278         if (__le32_to_cpu(sb->level) == 5) {
279                 c = map_num(r5layout, __le32_to_cpu(sb->layout));
280                 printf("         Layout : %s\n", c?c:"-unknown-");
281         }
282         if (__le32_to_cpu(sb->level) == 10) {
283                 int lo = __le32_to_cpu(sb->layout);
284                 printf("         Layout : near=%d, %s=%d\n",
285                        lo&255,
286                        (lo&0x10000)?"offset":"far",
287                        (lo>>8)&255);
288         }
289         switch(__le32_to_cpu(sb->level)) {
290         case 0:
291         case 4:
292         case 5:
293         case 6:
294         case 10:
295                 printf("     Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize)/2);
296                 break;
297         case -1:
298                 printf("       Rounding : %dK\n", __le32_to_cpu(sb->chunksize)/2);
299                 break;
300         default: break;
301         }
302         printf("\n");
303         printf("    Array Slot : %d (", __le32_to_cpu(sb->dev_number));
304         for (i= __le32_to_cpu(sb->max_dev); i> 0 ; i--)
305                 if (__le16_to_cpu(sb->dev_roles[i-1]) != 0xffff)
306                         break;
307         for (d=0; d < i; d++) {
308                 int role = __le16_to_cpu(sb->dev_roles[d]);
309                 if (d) printf(", ");
310                 if (role == 0xffff) printf("empty");
311                 else if(role == 0xfffe) printf("failed");
312                 else printf("%d", role);
313         }
314         printf(")\n");
315         printf("   Array State : ");
316         for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
317                 int cnt = 0;
318                 int me = 0;
319                 int i;
320                 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
321                         int role = __le16_to_cpu(sb->dev_roles[i]);
322                         if (role == d) {
323                                 if (i == __le32_to_cpu(sb->dev_number))
324                                         me = 1;
325                                 cnt++;
326                         }
327                 }
328                 if (cnt > 1) printf("?");
329                 else if (cnt == 1 && me) printf("U");
330                 else if (cnt == 1) printf("u");
331                 else printf ("_");
332         }
333         faulty = 0;
334         for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
335                 int role = __le16_to_cpu(sb->dev_roles[i]);
336                 if (role == 0xFFFE)
337                         faulty++;
338         }
339         if (faulty) printf(" %d failed", faulty);
340         printf("\n");
341 }
342
343
344 static void brief_examine_super1(struct supertype *st)
345 {
346         struct mdp_superblock_1 *sb = st->sb;
347         int i;
348         unsigned long long sb_offset;
349         char *nm;
350         char *c=map_num(pers, __le32_to_cpu(sb->level));
351
352         nm = strchr(sb->set_name, ':');
353         if (nm)
354                 nm++;
355         else if (sb->set_name[0])
356                 nm = sb->set_name;
357         else
358                 nm = "??";
359
360         printf("ARRAY /dev/md/%s level=%s ", nm, c?c:"-unknown-");
361         sb_offset = __le64_to_cpu(sb->super_offset);
362         if (sb_offset <= 4)
363                 printf("metadata=1.1 ");
364         else if (sb_offset <= 8)
365                 printf("metadata=1.2 ");
366         else
367                 printf("metadata=1.0 ");
368         printf("num-devices=%d UUID=", __le32_to_cpu(sb->raid_disks));
369         for (i=0; i<16; i++) {
370                 if ((i&3)==0 && i != 0) printf(":");
371                 printf("%02x", sb->set_uuid[i]);
372         }
373         if (sb->set_name[0])
374                 printf(" name=%.32s", sb->set_name);
375         printf("\n");
376 }
377
378 static void export_examine_super1(struct supertype *st)
379 {
380         struct mdp_superblock_1 *sb = st->sb;
381         int i;
382         int len = 32;
383
384         printf("MD_LEVEL=%s\n", map_num(pers, __le32_to_cpu(sb->level)));
385         printf("MD_DEVICES=%d\n", __le32_to_cpu(sb->raid_disks));
386         for (i=0; i<32; i++)
387                 if (sb->set_name[i] == '\n' ||
388                     sb->set_name[i] == '\0') {
389                         len = i;
390                         break;
391                 }
392         if (len)
393                 printf("MD_NAME=%.*s\n", len, sb->set_name);
394         printf("MD_UUID=");
395         for (i=0; i<16; i++) {
396                 if ((i&3)==0 && i != 0) printf(":");
397                 printf("%02x", sb->set_uuid[i]);
398         }
399         printf("\n");
400         printf("MD_UPDATE_TIME=%llu\n",
401                __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL);
402         printf("MD_DEV_UUID=");
403         for (i=0; i<16; i++) {
404                 if ((i&3)==0 && i != 0) printf(":");
405                 printf("%02x", sb->device_uuid[i]);
406         }
407         printf("\n");
408         printf("MD_EVENTS=%llu\n",
409                (unsigned long long)__le64_to_cpu(sb->events));
410 }
411
412 static void detail_super1(struct supertype *st, char *homehost)
413 {
414         struct mdp_superblock_1 *sb = st->sb;
415         int i;
416         int l = homehost ? strlen(homehost) : 0;
417
418         printf("           Name : %.32s", sb->set_name);
419         if (l > 0 && l < 32 &&
420             sb->set_name[l] == ':' &&
421             strncmp(sb->set_name, homehost, l) == 0)
422                 printf("  (local to host %s)", homehost);
423         printf("\n           UUID : ");
424         for (i=0; i<16; i++) {
425                 if ((i&3)==0 && i != 0) printf(":");
426                 printf("%02x", sb->set_uuid[i]);
427         }
428         printf("\n         Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
429 }
430
431 static void brief_detail_super1(struct supertype *st)
432 {
433         struct mdp_superblock_1 *sb = st->sb;
434         int i;
435
436         if (sb->set_name[0])
437                 printf(" name=%.32s", sb->set_name);
438         printf(" UUID=");
439         for (i=0; i<16; i++) {
440                 if ((i&3)==0 && i != 0) printf(":");
441                 printf("%02x", sb->set_uuid[i]);
442         }
443 }
444
445 static void export_detail_super1(struct supertype *st)
446 {
447         struct mdp_superblock_1 *sb = st->sb;
448         int i;
449         int len = 32;
450
451         for (i=0; i<32; i++)
452                 if (sb->set_name[i] == '\n' ||
453                     sb->set_name[i] == '\0') {
454                         len = i;
455                         break;
456                 }
457         if (len)
458                 printf("MD_NAME=%.*s\n", len, sb->set_name);
459         printf("MD_UUID=");
460         for (i=0; i<16; i++) {
461                 if ((i&3)==0 && i != 0) printf(":");
462                 printf("%02x", sb->set_uuid[i]);
463         }
464         printf("\n");
465 }
466
467 #endif
468
469 static int match_home1(struct supertype *st, char *homehost)
470 {
471         struct mdp_superblock_1 *sb = st->sb;
472         int l = homehost ? strlen(homehost) : 0;
473
474         return (l > 0 && l < 32 &&
475                 sb->set_name[l] == ':' &&
476                 strncmp(sb->set_name, homehost, l) == 0);
477 }
478
479 static void uuid_from_super1(struct supertype *st, int uuid[4])
480 {
481         struct mdp_superblock_1 *super = st->sb;
482         char *cuuid = (char*)uuid;
483         int i;
484         for (i=0; i<16; i++)
485                 cuuid[i] = super->set_uuid[i];
486 }
487
488 static void getinfo_super1(struct supertype *st, struct mdinfo *info)
489 {
490         struct mdp_superblock_1 *sb = st->sb;
491         int working = 0;
492         int i;
493         int role;
494
495         info->array.major_version = 1;
496         info->array.minor_version = __le32_to_cpu(sb->feature_map);
497         info->array.patch_version = 0;
498         info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
499         info->array.level = __le32_to_cpu(sb->level);
500         info->array.layout = __le32_to_cpu(sb->layout);
501         info->array.md_minor = -1;
502         info->array.ctime = __le64_to_cpu(sb->ctime);
503         info->array.utime = __le64_to_cpu(sb->utime);
504         info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
505         info->array.state =
506                 (__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
507                 ? 1 : 0;
508
509         info->data_offset = __le64_to_cpu(sb->data_offset);
510         info->component_size = __le64_to_cpu(sb->size);
511
512         info->disk.major = 0;
513         info->disk.minor = 0;
514         info->disk.number = __le32_to_cpu(sb->dev_number);
515         if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
516             __le32_to_cpu(sb->max_dev) > 512)
517                 role = 0xfffe;
518         else
519                 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
520
521         info->disk.raid_disk = -1;
522         switch(role) {
523         case 0xFFFF:
524                 info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
525                 break;
526         case 0xFFFE:
527                 info->disk.state = 1; /* faulty */
528                 break;
529         default:
530                 info->disk.state = 6; /* active and in sync */
531                 info->disk.raid_disk = role;
532         }
533         info->events = __le64_to_cpu(sb->events);
534
535         memcpy(info->uuid, sb->set_uuid, 16);
536
537         strncpy(info->name, sb->set_name, 32);
538         info->name[32] = 0;
539
540         if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
541                 info->reshape_active = 1;
542                 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
543                 info->new_level = __le32_to_cpu(sb->new_level);
544                 info->delta_disks = __le32_to_cpu(sb->delta_disks);
545                 info->new_layout = __le32_to_cpu(sb->new_layout);
546                 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
547         } else
548                 info->reshape_active = 0;
549
550         for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
551                 role = __le16_to_cpu(sb->dev_roles[i]);
552                 if (/*role == 0xFFFF || */role < info->array.raid_disks)
553                         working++;
554         }
555
556         info->array.working_disks = working;
557 }
558
559 static int update_super1(struct supertype *st, struct mdinfo *info,
560                          char *update,
561                          char *devname, int verbose,
562                          int uuid_set, char *homehost)
563 {
564         /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
565          * For others, the return value is ignored.
566          */
567         int rv = 0;
568         struct mdp_superblock_1 *sb = st->sb;
569
570         if (strcmp(update, "force-one")==0) {
571                 /* Not enough devices for a working array,
572                  * so bring this one up-to-date
573                  */
574                 if (sb->events != __cpu_to_le64(info->events))
575                         rv = 1;
576                 sb->events = __cpu_to_le64(info->events);
577         }
578         if (strcmp(update, "force-array")==0) {
579                 /* Degraded array and 'force' requests to
580                  * maybe need to mark it 'clean'.
581                  */
582                 switch(__le32_to_cpu(sb->level)) {
583                 case 5: case 4: case 6:
584                         /* need to force clean */
585                         if (sb->resync_offset != ~0ULL)
586                                 rv = 1;
587                         sb->resync_offset = ~0ULL;
588                 }
589         }
590         if (strcmp(update, "assemble")==0) {
591                 int d = info->disk.number;
592                 int want;
593                 if (info->disk.state == 6)
594                         want = __cpu_to_le32(info->disk.raid_disk);
595                 else
596                         want = 0xFFFF;
597                 if (sb->dev_roles[d] != want) {
598                         sb->dev_roles[d] = want;
599                         rv = 1;
600                 }
601         }
602         if (strcmp(update, "linear-grow-new") == 0) {
603                 int i;
604                 int rfd;
605                 int max = __le32_to_cpu(sb->max_dev);
606
607                 for (i=0 ; i < max ; i++)
608                         if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
609                                 break;
610                 sb->dev_number = __cpu_to_le32(i);
611                 info->disk.number = i;
612                 if (max >= __le32_to_cpu(sb->max_dev))
613                         sb->max_dev = __cpu_to_le32(max+1);
614
615                 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
616                     read(rfd, sb->device_uuid, 16) != 16) {
617                         *(__u32*)(sb->device_uuid) = random();
618                         *(__u32*)(sb->device_uuid+4) = random();
619                         *(__u32*)(sb->device_uuid+8) = random();
620                         *(__u32*)(sb->device_uuid+12) = random();
621                 }
622
623                 sb->dev_roles[i] =
624                         __cpu_to_le16(info->disk.raid_disk);
625         }
626         if (strcmp(update, "linear-grow-update") == 0) {
627                 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
628                 sb->dev_roles[info->disk.number] =
629                         __cpu_to_le16(info->disk.raid_disk);
630         }
631         if (strcmp(update, "resync") == 0) {
632                 /* make sure resync happens */
633                 sb->resync_offset = 0ULL;
634         }
635         if (strcmp(update, "uuid") == 0) {
636                 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
637
638                 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
639                         struct bitmap_super_s *bm;
640                         bm = (struct bitmap_super_s*)(st->sb+1024);
641                         memcpy(bm->uuid, sb->set_uuid, 16);
642                 }
643         }
644         if (strcmp(update, "homehost") == 0 &&
645             homehost) {
646                 char *c;
647                 update = "name";
648                 c = strchr(sb->set_name, ':');
649                 if (c)
650                         strncpy(info->name, c+1, 31 - (c-sb->set_name));
651                 else
652                         strncpy(info->name, sb->set_name, 32);
653                 info->name[32] = 0;
654         }
655         if (strcmp(update, "name") == 0) {
656                 if (info->name[0] == 0)
657                         sprintf(info->name, "%d", info->array.md_minor);
658                 memset(sb->set_name, 0, sizeof(sb->set_name));
659                 if (homehost &&
660                     strchr(info->name, ':') == NULL &&
661                     strlen(homehost)+1+strlen(info->name) < 32) {
662                         strcpy(sb->set_name, homehost);
663                         strcat(sb->set_name, ":");
664                         strcat(sb->set_name, info->name);
665                 } else
666                         strcpy(sb->set_name, info->name);
667         }
668         if (strcmp(update, "devicesize") == 0 &&
669             __le64_to_cpu(sb->super_offset) <
670             __le64_to_cpu(sb->data_offset)) {
671                 /* set data_size to device size less data_offset */
672                 struct misc_dev_info *misc = (struct misc_dev_info*)
673                         (st->sb + 1024 + sizeof(struct bitmap_super_s));
674                 printf("Size was %llu\n", (unsigned long long)
675                        __le64_to_cpu(sb->data_size));
676                 sb->data_size = __cpu_to_le64(
677                         misc->device_size - __le64_to_cpu(sb->data_offset));
678                 printf("Size is %llu\n", (unsigned long long)
679                        __le64_to_cpu(sb->data_size));
680         }
681         if (strcmp(update, "_reshape_progress")==0)
682                 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
683
684         sb->sb_csum = calc_sb_1_csum(sb);
685         return rv;
686 }
687
688 static int init_super1(struct supertype *st, mdu_array_info_t *info,
689                        unsigned long long size, char *name, char *homehost, int *uuid)
690 {
691         struct mdp_superblock_1 *sb = malloc(1024 + sizeof(bitmap_super_t) +
692                                              sizeof(struct misc_dev_info));
693         int spares;
694         int rfd;
695         char defname[10];
696         memset(sb, 0, 1024);
697
698         st->sb = sb;
699         if (info->major_version == -1) {
700                 /* zeroing superblock */
701                 return 0;
702         }
703
704         spares = info->working_disks - info->active_disks;
705         if (info->raid_disks + spares  > 384) {
706                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
707                         info->raid_disks , spares, 384);
708                 return 0;
709         }
710
711         sb->magic = __cpu_to_le32(MD_SB_MAGIC);
712         sb->major_version = __cpu_to_le32(1);
713         sb->feature_map = 0;
714         sb->pad0 = 0;
715
716         if (uuid)
717                 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
718         else {
719                 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
720                     read(rfd, sb->set_uuid, 16) != 16) {
721                         *(__u32*)(sb->set_uuid) = random();
722                         *(__u32*)(sb->set_uuid+4) = random();
723                         *(__u32*)(sb->set_uuid+8) = random();
724                         *(__u32*)(sb->set_uuid+12) = random();
725                 }
726                 if (rfd >= 0) close(rfd);
727         }
728
729         if (name == NULL || *name == 0) {
730                 sprintf(defname, "%d", info->md_minor);
731                 name = defname;
732         }
733         memset(sb->set_name, 0, 32);
734         if (homehost &&
735             strchr(name, ':')== NULL &&
736             strlen(homehost)+1+strlen(name) < 32) {
737                 strcpy(sb->set_name, homehost);
738                 strcat(sb->set_name, ":");
739                 strcat(sb->set_name, name);
740         } else
741                 strcpy(sb->set_name, name);
742
743         sb->ctime = __cpu_to_le64((unsigned long long)time(0));
744         sb->level = __cpu_to_le32(info->level);
745         sb->layout = __cpu_to_le32(info->layout);
746         sb->size = __cpu_to_le64(size*2ULL);
747         sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
748         sb->raid_disks = __cpu_to_le32(info->raid_disks);
749
750         sb->data_offset = __cpu_to_le64(0);
751         sb->data_size = __cpu_to_le64(0);
752         sb->super_offset = __cpu_to_le64(0);
753         sb->recovery_offset = __cpu_to_le64(0);
754
755         sb->utime = sb->ctime;
756         sb->events = __cpu_to_le64(1);
757         if (info->state & (1<<MD_SB_CLEAN))
758                 sb->resync_offset = ~0ULL;
759         else
760                 sb->resync_offset = 0;
761         sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
762                                     sizeof(sb->dev_roles[0]));
763         memset(sb->pad3, 0, sizeof(sb->pad3));
764
765         memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
766
767         return 1;
768 }
769
770 /* Add a device to the superblock being created */
771 static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk)
772 {
773         struct mdp_superblock_1 *sb = st->sb;
774         __u16 *rp = sb->dev_roles + dk->number;
775         if ((dk->state & 6) == 6) /* active, sync */
776                 *rp = __cpu_to_le16(dk->raid_disk);
777         else if ((dk->state & ~2) == 0) /* active or idle -> spare */
778                 *rp = 0xffff;
779         else
780                 *rp = 0xfffe;
781 }
782
783 static void locate_bitmap1(struct supertype *st, int fd);
784
785 static int store_super1(struct supertype *st, int fd)
786 {
787         struct mdp_superblock_1 *sb = st->sb;
788         unsigned long long sb_offset;
789         int sbsize;
790         unsigned long long dsize;
791
792         if (!get_dev_size(fd, NULL, &dsize))
793                 return 1;
794
795         dsize >>= 9;
796
797         if (dsize < 24)
798                 return 2;
799
800         /*
801          * Calculate the position of the superblock.
802          * It is always aligned to a 4K boundary and
803          * depending on minor_version, it can be:
804          * 0: At least 8K, but less than 12K, from end of device
805          * 1: At start of device
806          * 2: 4K from start of device.
807          */
808         switch(st->minor_version) {
809         case 0:
810                 sb_offset = dsize;
811                 sb_offset -= 8*2;
812                 sb_offset &= ~(4*2-1);
813                 break;
814         case 1:
815                 sb_offset = 0;
816                 break;
817         case 2:
818                 sb_offset = 4*2;
819                 break;
820         default:
821                 return -EINVAL;
822         }
823
824
825
826         if (sb_offset != __le64_to_cpu(sb->super_offset) &&
827             0 != __le64_to_cpu(sb->super_offset)
828                 ) {
829                 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
830                 abort();
831         }
832
833         if (lseek64(fd, sb_offset << 9, 0)< 0LL)
834                 return 3;
835
836         sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
837
838         if (write(fd, sb, sbsize) != sbsize)
839                 return 4;
840
841         if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
842                 struct bitmap_super_s *bm = (struct bitmap_super_s*)
843                         (((char*)sb)+1024);
844                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
845                         locate_bitmap1(st, fd);
846                         if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
847                             return 5;
848                 }
849         }
850         fsync(fd);
851         return 0;
852 }
853
854 static int load_super1(struct supertype *st, int fd, char *devname);
855
856 static unsigned long choose_bm_space(unsigned long devsize)
857 {
858         /* if the device is bigger than 8Gig, save 64k for bitmap usage,
859          * if bigger than 200Gig, save 128k
860          */
861         if (devsize < 64*2) return 0;
862         if (devsize - 64*2 >= 200*1024*1024*2)
863                 return 128*2;
864         if (devsize - 4*2 > 8*1024*1024*2)
865                 return 64*2;
866         return 4*2;
867 }
868
869 static int write_init_super1(struct supertype *st,
870                              mdu_disk_info_t *dinfo, char *devname)
871 {
872         struct mdp_superblock_1 *sb = st->sb;
873         struct supertype refst;
874         int fd = open(devname, O_RDWR | O_EXCL);
875         int rfd;
876         int rv;
877         int bm_space;
878
879         unsigned long long dsize, array_size;
880         long long sb_offset;
881
882
883         if (fd < 0) {
884                 fprintf(stderr, Name ": Failed to open %s to write superblock\n",
885                         devname);
886                 return -1;
887         }
888
889         sb->dev_number = __cpu_to_le32(dinfo->number);
890         if (dinfo->state & (1<<MD_DISK_WRITEMOSTLY))
891                 sb->devflags |= __cpu_to_le32(WriteMostly1);
892
893         if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
894             read(rfd, sb->device_uuid, 16) != 16) {
895                 *(__u32*)(sb->device_uuid) = random();
896                 *(__u32*)(sb->device_uuid+4) = random();
897                 *(__u32*)(sb->device_uuid+8) = random();
898                 *(__u32*)(sb->device_uuid+12) = random();
899         }
900         if (rfd >= 0) close(rfd);
901         sb->events = 0;
902
903         refst =*st;
904         refst.sb = NULL;
905         if (load_super1(&refst, fd, NULL)==0) {
906                 struct mdp_superblock_1 *refsb = refst.sb;
907
908                 memcpy(sb->device_uuid, refsb->device_uuid, 16);
909                 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
910                         /* same array, so preserve events and dev_number */
911                         sb->events = refsb->events;
912                         /* bugs in 2.6.17 and earlier mean the dev_number
913                          * chosen in Manage must be preserved
914                          */
915                         if (get_linux_version() >= 2006018)
916                                 sb->dev_number = refsb->dev_number;
917                 }
918                 free(refsb);
919         }
920
921         if (!get_dev_size(fd, NULL, &dsize))
922                 return 1;
923         dsize >>= 9;
924
925         if (dsize < 24) {
926                 close(fd);
927                 return 2;
928         }
929
930
931         /*
932          * Calculate the position of the superblock.
933          * It is always aligned to a 4K boundary and
934          * depending on minor_version, it can be:
935          * 0: At least 8K, but less than 12K, from end of device
936          * 1: At start of device
937          * 2: 4K from start of device.
938          * Depending on the array size, we might leave extra space
939          * for a bitmap.
940          */
941         array_size = __le64_to_cpu(sb->size);
942         /* work out how much space we left for a bitmap */
943         bm_space = choose_bm_space(array_size);
944
945         switch(st->minor_version) {
946         case 0:
947                 sb_offset = dsize;
948                 sb_offset -= 8*2;
949                 sb_offset &= ~(4*2-1);
950                 sb->super_offset = __cpu_to_le64(sb_offset);
951                 sb->data_offset = __cpu_to_le64(0);
952                 if (sb_offset - bm_space < array_size)
953                         bm_space = sb_offset - array_size;
954                 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
955                 break;
956         case 1:
957                 sb->super_offset = __cpu_to_le64(0);
958                 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
959                         bm_space = dsize - __le64_to_cpu(sb->size) - 4*2;
960                 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
961                 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
962                 break;
963         case 2:
964                 sb_offset = 4*2;
965                 sb->super_offset = __cpu_to_le64(4*2);
966                 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
967                         bm_space = dsize - __le64_to_cpu(sb->size) - 4*2 - 4*2;
968                 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
969                 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2 - bm_space );
970                 break;
971         default:
972                 return -EINVAL;
973         }
974
975
976         sb->sb_csum = calc_sb_1_csum(sb);
977         rv = store_super1(st, fd);
978         if (rv)
979                 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
980
981         if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
982                 rv = st->ss->write_bitmap(st, fd);
983         close(fd);
984         return rv;
985 }
986
987 static int compare_super1(struct supertype *st, struct supertype *tst)
988 {
989         /*
990          * return:
991          *  0 same, or first was empty, and second was copied
992          *  1 second had wrong number
993          *  2 wrong uuid
994          *  3 wrong other info
995          */
996         struct mdp_superblock_1 *first = st->sb;
997         struct mdp_superblock_1 *second = tst->sb;
998
999         if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1000                 return 1;
1001         if (second->major_version != __cpu_to_le32(1))
1002                 return 1;
1003
1004         if (!first) {
1005                 first = malloc(1024+sizeof(bitmap_super_t) +
1006                                sizeof(struct misc_dev_info));
1007                 memcpy(first, second, 1024+sizeof(bitmap_super_t) +
1008                        sizeof(struct misc_dev_info));
1009                 st->sb = first;
1010                 return 0;
1011         }
1012         if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1013                 return 2;
1014
1015         if (first->ctime      != second->ctime     ||
1016             first->level      != second->level     ||
1017             first->layout     != second->layout    ||
1018             first->size       != second->size      ||
1019             first->chunksize  != second->chunksize ||
1020             first->raid_disks != second->raid_disks)
1021                 return 3;
1022         return 0;
1023 }
1024
1025 static void free_super1(struct supertype *st);
1026
1027 static int load_super1(struct supertype *st, int fd, char *devname)
1028 {
1029         unsigned long long dsize;
1030         unsigned long long sb_offset;
1031         struct mdp_superblock_1 *super;
1032         int uuid[4];
1033         struct bitmap_super_s *bsb;
1034         struct misc_dev_info *misc;
1035
1036         free_super1(st);
1037
1038         if (st->ss == NULL || st->minor_version == -1) {
1039                 int bestvers = -1;
1040                 struct supertype tst;
1041                 __u64 bestctime = 0;
1042                 /* guess... choose latest ctime */
1043                 tst.ss = &super1;
1044                 tst.sb = NULL;
1045                 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1046                         switch(load_super1(&tst, fd, devname)) {
1047                         case 0: super = tst.sb;
1048                                 if (bestvers == -1 ||
1049                                     bestctime < __le64_to_cpu(super->ctime)) {
1050                                         bestvers = tst.minor_version;
1051                                         bestctime = __le64_to_cpu(super->ctime);
1052                                 }
1053                                 free(super);
1054                                 tst.sb = NULL;
1055                                 break;
1056                         case 1: return 1; /*bad device */
1057                         case 2: break; /* bad, try next */
1058                         }
1059                 }
1060                 if (bestvers != -1) {
1061                         int rv;
1062                         tst.minor_version = bestvers;
1063                         tst.ss = &super1;
1064                         tst.max_devs = 384;
1065                         rv = load_super1(&tst, fd, devname);
1066                         if (rv == 0)
1067                                 *st = tst;
1068                         return rv;
1069                 }
1070                 return 2;
1071         }
1072         if (!get_dev_size(fd, devname, &dsize))
1073                 return 1;
1074         dsize >>= 9;
1075
1076         if (dsize < 24) {
1077                 if (devname)
1078                         fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1079                                 devname, dsize);
1080                 return 1;
1081         }
1082
1083         /*
1084          * Calculate the position of the superblock.
1085          * It is always aligned to a 4K boundary and
1086          * depending on minor_version, it can be:
1087          * 0: At least 8K, but less than 12K, from end of device
1088          * 1: At start of device
1089          * 2: 4K from start of device.
1090          */
1091         switch(st->minor_version) {
1092         case 0:
1093                 sb_offset = dsize;
1094                 sb_offset -= 8*2;
1095                 sb_offset &= ~(4*2-1);
1096                 break;
1097         case 1:
1098                 sb_offset = 0;
1099                 break;
1100         case 2:
1101                 sb_offset = 4*2;
1102                 break;
1103         default:
1104                 return -EINVAL;
1105         }
1106
1107         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1108
1109
1110         if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1111                 if (devname)
1112                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1113                                 devname, strerror(errno));
1114                 return 1;
1115         }
1116
1117         super = malloc(1024 + sizeof(bitmap_super_t) +
1118                        sizeof(struct misc_dev_info));
1119
1120         if (read(fd, super, 1024) != 1024) {
1121                 if (devname)
1122                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
1123                                 devname);
1124                 free(super);
1125                 return 1;
1126         }
1127
1128         if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1129                 if (devname)
1130                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1131                                 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1132                 free(super);
1133                 return 2;
1134         }
1135
1136         if (__le32_to_cpu(super->major_version) != 1) {
1137                 if (devname)
1138                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1139                                 devname, __le32_to_cpu(super->major_version));
1140                 free(super);
1141                 return 2;
1142         }
1143         if (__le64_to_cpu(super->super_offset) != sb_offset) {
1144                 if (devname)
1145                         fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1146                                 devname);
1147                 free(super);
1148                 return 2;
1149         }
1150         st->sb = super;
1151
1152         bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1153
1154         misc = (struct misc_dev_info*) (bsb+1);
1155         misc->device_size = dsize;
1156
1157         /* Now check on the bitmap superblock */
1158         if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1159                 return 0;
1160         /* Read the bitmap superblock and make sure it looks
1161          * valid.  If it doesn't clear the bit.  An --assemble --force
1162          * should get that written out.
1163          */
1164         locate_bitmap1(st, fd);
1165         if (read(fd, ((char*)super)+1024, sizeof(struct bitmap_super_s))
1166             != sizeof(struct bitmap_super_s))
1167                 goto no_bitmap;
1168
1169         uuid_from_super1(st, uuid);
1170         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1171             memcmp(bsb->uuid, uuid, 16) != 0)
1172                 goto no_bitmap;
1173         return 0;
1174
1175  no_bitmap:
1176         super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1177         return 0;
1178 }
1179
1180
1181 static struct supertype *match_metadata_desc1(char *arg)
1182 {
1183         struct supertype *st = malloc(sizeof(*st));
1184         if (!st) return st;
1185
1186         st->ss = &super1;
1187         st->max_devs = 384;
1188         st->sb = NULL;
1189         if (strcmp(arg, "1.0") == 0) {
1190                 st->minor_version = 0;
1191                 return st;
1192         }
1193         if (strcmp(arg, "1.1") == 0) {
1194                 st->minor_version = 1;
1195                 return st;
1196         }
1197         if (strcmp(arg, "1.2") == 0) {
1198                 st->minor_version = 2;
1199                 return st;
1200         }
1201         if (strcmp(arg, "1") == 0 ||
1202             strcmp(arg, "default") == 0) {
1203                 st->minor_version = -1;
1204                 return st;
1205         }
1206
1207         free(st);
1208         return NULL;
1209 }
1210
1211 /* find available size on device with this devsize, using
1212  * superblock type st, and reserving 'reserve' sectors for
1213  * a possible bitmap
1214  */
1215 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1216 {
1217         if (devsize < 24)
1218                 return 0;
1219
1220         devsize -= choose_bm_space(devsize);
1221
1222         switch(st->minor_version) {
1223         case -1: /* no specified.  Now time to set default */
1224                 st->minor_version = 0;
1225                 /* FALL THROUGH */
1226         case 0:
1227                 /* at end */
1228                 return ((devsize - 8*2 ) & ~(4*2-1));
1229         case 1:
1230                 /* at start, 4K for superblock and possible bitmap */
1231                 return devsize - 4*2;
1232         case 2:
1233                 /* 4k from start, 4K for superblock and possible bitmap */
1234                 return devsize - (4+4)*2;
1235         }
1236         return 0;
1237 }
1238
1239 static int
1240 add_internal_bitmap1(struct supertype *st,
1241                      int *chunkp, int delay, int write_behind,
1242                      unsigned long long size,
1243                      int may_change, int major)
1244 {
1245         /*
1246          * If not may_change, then this is a 'Grow', and the bitmap
1247          * must fit after the superblock.
1248          * If may_change, then this is create, and we can put the bitmap
1249          * before the superblock if we like, or may move the start.
1250          * If !may_change, the bitmap MUST live at offset of 1K, until
1251          * we get a sysfs interface.
1252          *
1253          * size is in sectors,  chunk is in bytes !!!
1254          */
1255
1256         unsigned long long bits;
1257         unsigned long long max_bits;
1258         unsigned long long min_chunk;
1259         long offset;
1260         int chunk = *chunkp;
1261         int room = 0;
1262         struct mdp_superblock_1 *sb = st->sb;
1263         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1264
1265         switch(st->minor_version) {
1266         case 0:
1267                 /* either 3K after the superblock, or some amount of space
1268                  * before.
1269                  */
1270                 if (may_change) {
1271                         /* We are creating array, so we *know* how much room has
1272                          * been left.
1273                          */
1274                         offset = 0;
1275                         room = choose_bm_space(__le64_to_cpu(sb->size));
1276                         if (room == 4*2) {
1277                                 /* make it 3K after the superblock */
1278                                 room = 3*2;
1279                                 offset = 2;
1280                         }
1281                 } else {
1282                         room = __le64_to_cpu(sb->super_offset)
1283                                 - __le64_to_cpu(sb->data_offset)
1284                                 - __le64_to_cpu(sb->data_size);
1285                         /* remove '1 ||' when we can set offset via sysfs */
1286                         if (1 || (room < 3*2 &&
1287                                   __le32_to_cpu(sb->max_dev) <= 384)) {
1288                                 room = 3*2;
1289                                 offset = 1*2;
1290                         } else {
1291                                 offset = 0; /* means movable offset */
1292                         }
1293                 }
1294                 break;
1295         case 1:
1296         case 2: /* between superblock and data */
1297                 if (may_change) {
1298                         offset = 4*2;
1299                         room = choose_bm_space(__le64_to_cpu(sb->size));
1300                 } else {
1301                         room = __le64_to_cpu(sb->data_offset)
1302                                 - __le64_to_cpu(sb->super_offset);
1303                         if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1304                                 room -= 2;
1305                                 offset = 2;
1306                         } else {
1307                                 room -= 4*2;
1308                                 offset = 4*2;
1309                         }
1310                 }
1311                 break;
1312         default:
1313                 return 0;
1314         }
1315
1316         if (chunk == UnSet && room > 128*2)
1317                 /* Limit to 128K of bitmap when chunk size not requested */
1318                 room = 128*2;
1319
1320         max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1321
1322         min_chunk = 4096; /* sub-page chunks don't work yet.. */
1323         bits = (size*512)/min_chunk +1;
1324         while (bits > max_bits) {
1325                 min_chunk *= 2;
1326                 bits = (bits+1)/2;
1327         }
1328         if (chunk == UnSet)
1329                 chunk = min_chunk;
1330         else if (chunk < min_chunk)
1331                 return 0; /* chunk size too small */
1332         if (chunk == 0) /* rounding problem */
1333                 return 0;
1334
1335         if (offset == 0) {
1336                 bits = (size*512) / chunk + 1;
1337                 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1338                 offset = -room;
1339         }
1340
1341         sb->bitmap_offset = __cpu_to_le32(offset);
1342
1343         sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1344         memset(bms, 0, sizeof(*bms));
1345         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1346         bms->version = __cpu_to_le32(major);
1347         uuid_from_super1(st, (int*)bms->uuid);
1348         bms->chunksize = __cpu_to_le32(chunk);
1349         bms->daemon_sleep = __cpu_to_le32(delay);
1350         bms->sync_size = __cpu_to_le64(size);
1351         bms->write_behind = __cpu_to_le32(write_behind);
1352
1353         *chunkp = chunk;
1354         return 1;
1355 }
1356
1357
1358 static void locate_bitmap1(struct supertype *st, int fd)
1359 {
1360         unsigned long long offset;
1361         struct mdp_superblock_1 *sb;
1362         int mustfree = 0;
1363
1364         if (!st->sb) {
1365                 if (st->ss->load_super(st, fd, NULL))
1366                         return; /* no error I hope... */
1367                 mustfree = 1;
1368         }
1369         sb = st->sb;
1370
1371         offset = __le64_to_cpu(sb->super_offset);
1372         offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1373         if (mustfree)
1374                 free(sb);
1375         lseek64(fd, offset<<9, 0);
1376 }
1377
1378 static int write_bitmap1(struct supertype *st, int fd)
1379 {
1380         struct mdp_superblock_1 *sb = st->sb;
1381         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1382         int rv = 0;
1383
1384         int towrite, n;
1385         char buf[4096];
1386
1387         locate_bitmap1(st, fd);
1388
1389         if (write(fd, ((char*)sb)+1024, sizeof(bitmap_super_t)) !=
1390             sizeof(bitmap_super_t))
1391                 return -2;
1392         towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1393         towrite = (towrite+7) >> 3; /* bits to bytes */
1394         memset(buf, 0xff, sizeof(buf));
1395         while (towrite > 0) {
1396                 n = towrite;
1397                 if (n > sizeof(buf))
1398                         n = sizeof(buf);
1399                 n = write(fd, buf, n);
1400                 if (n > 0)
1401                         towrite -= n;
1402                 else
1403                         break;
1404         }
1405         fsync(fd);
1406         if (towrite)
1407                 rv = -2;
1408
1409         return rv;
1410 }
1411
1412 static void free_super1(struct supertype *st)
1413 {
1414         if (st->sb)
1415                 free(st->sb);
1416         st->sb = NULL;
1417 }
1418
1419 static int validate_geometry1(struct supertype *st, int level,
1420                               int layout, int raiddisks,
1421                               int chunk, unsigned long long size,
1422                               char *subdev, unsigned long long *freesize)
1423 {
1424         unsigned long long ldsize;
1425         int fd;
1426
1427         if (level == LEVEL_CONTAINER)
1428                 return 0;
1429         if (!subdev)
1430                 return 1;
1431
1432         fd = open(subdev, O_RDONLY|O_EXCL, 0);
1433         if (fd < 0) {
1434                 fprintf(stderr, Name ": Cannot open %s: %s\n",
1435                         subdev, strerror(errno));
1436                 return 0;
1437         }
1438         if (!get_dev_size(fd, subdev, &ldsize)) {
1439                 close(fd);
1440                 return 0;
1441         }
1442         close(fd);
1443
1444         *freesize = avail_size1(st, ldsize >> 9);
1445         return 1;
1446 }
1447
1448 struct superswitch super1 = {
1449 #ifndef MDASSEMBLE
1450         .examine_super = examine_super1,
1451         .brief_examine_super = brief_examine_super1,
1452         .export_examine_super = export_examine_super1,
1453         .detail_super = detail_super1,
1454         .brief_detail_super = brief_detail_super1,
1455         .export_detail_super = export_detail_super1,
1456 #endif
1457         .match_home = match_home1,
1458         .uuid_from_super = uuid_from_super1,
1459         .getinfo_super = getinfo_super1,
1460         .update_super = update_super1,
1461         .init_super = init_super1,
1462         .add_to_super = add_to_super1,
1463         .store_super = store_super1,
1464         .write_init_super = write_init_super1,
1465         .compare_super = compare_super1,
1466         .load_super = load_super1,
1467         .match_metadata_desc = match_metadata_desc1,
1468         .avail_size = avail_size1,
1469         .add_internal_bitmap = add_internal_bitmap1,
1470         .locate_bitmap = locate_bitmap1,
1471         .write_bitmap = write_bitmap1,
1472         .free_super = free_super1,
1473         .validate_geometry = validate_geometry1,
1474         .major = 1,
1475 #if __BYTE_ORDER == BIG_ENDIAN
1476         .swapuuid = 0,
1477 #else
1478         .swapuuid = 1,
1479 #endif
1480 };