1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
|
/*
*
* (C) Copyright IBM Corp. 2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Module: libgpt.so
*
* File: move.c
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <plugin.h>
#include "gpt.h"
#include "helpers.h"
#include "move.h"
#include "dm.h"
#include "commit.h"
/*
* Function: safe to move
*
* Called to determine if it would be Ok to move
* the sepcified segment object.
*/
static inline boolean safe_to_move(DISKSEG *seg)
{
LOGICALDISK *ld=get_logical_disk(seg);
DISK_PRIVATE_DATA *disk_pdata=NULL;
if ( ld ) {
disk_pdata = get_gpt_disk_private_data(ld);
if (disk_pdata) {
if ( i_can_modify(seg) == TRUE &&
seg->data_type == DATA_TYPE &&
(disk_pdata->flags & DISK_HAS_MOVE_PENDING) == 0 ) {
return TRUE;
}
}
}
return FALSE;
}
/*
* Function: free a copy_job_t
*
* Called to free a copy_job_t
*/
static inline void free_copy_job_t(copy_job_t *job)
{
if (job) {
free(job->title);
free(job);
}
}
/*
* Function: alloc copy_job_t
*
* Called to allocate a copy_job_t
*/
static inline copy_job_t * alloc_copy_job_t(void)
{
copy_job_t *job = calloc( 1, sizeof(copy_job_t) );
return job;
}
/*
* Function: copy callback
*
* Called by gpt_move_start() to create an engine copy job that
* will be executed during a subsequent commit.
*/
static int create_copy_job( DISKSEG *seg, // data segment to be moved
DISKSEG *trg, // move target segment
copy_job_t **copyjob ) // callers copy_job struct
{
int rc=ENOMEM;
DISK_PRIVATE_DATA *disk_pdata=NULL;
LOGICALDISK *ld=NULL;
copy_job_t *job=NULL;
char *title=NULL;
LOG_ENTRY();
ld = get_logical_disk(seg);
disk_pdata = get_gpt_disk_private_data(ld);
job = alloc_copy_job_t();
title = malloc(EVMS_NAME_SIZE*2+2);
if (job && title) {
sprintf(title, "Moving segment %s\n", seg->name);
job->title = title;
job->description = "";
job->src.obj = ld;
job->src.start = seg->start;
job->src.len = seg->size;
job->trg.obj = ld;
job->trg.start = trg->start;
job->trg.len = trg->size;
*copyjob = job;
rc = 0;
}
if (rc) {
if (job) free_copy_job_t(job);
if (title) free(title);
}
LOG_EXIT_INT(rc);
return rc;
}
/*
* Function: create move target segment
*
* Called by our private function gpt_move_segment()
* to create a target storage_object_t that will
* be used to move the specified disk segment.
*/
static int create_move_target( DISKSEG *seg, // source data segment
DISKSEG *freespace, // target freespace segment
DISKSEG **target, // where to return move target storage object
boolean testing ) // testing == TRUE if we just want to test
{ // if a move object could be created and
LOGICALDISK *ld=NULL; // dont actually want the object returned
DISKSEG *trg=NULL;
SEG_PRIVATE_DATA *src_pdata=NULL;
SEG_PRIVATE_DATA *trg_pdata=NULL;
DISK_PRIVATE_DATA *disk_pdata=NULL;
lba_t start=0;
lba_t end=0;
int rc = EINVAL;
LOG_ENTRY();
if (seg) {
ld = get_logical_disk(seg);
disk_pdata = get_gpt_disk_private_data(ld);
src_pdata = (SEG_PRIVATE_DATA *) seg->private_data;
}
if (ld && disk_pdata) {
rc = ENOMEM;
trg = allocate_gpt_disk_segment( ld );
if (trg) {
sprintf(trg->name, "%s_move_target", seg->name );
trg->data_type = DATA_TYPE;
trg->flags &= ~SOFLAG_DIRTY;
trg_pdata = (SEG_PRIVATE_DATA *) trg->private_data;
rc = 0;
}
}
if (rc==0) {
rc = EFBIG;
// calculate the starting lba
if (starts_on_cylinder_boundary(ld,seg->start)==TRUE) {
if (starts_on_cylinder_boundary(ld,freespace->start)==TRUE) {
start = freespace->start;
}
else {
start = roundup_to_cylinder_boundary(ld,freespace->start)+1;
LOG_DEBUG("freespace doesn't start on cyl bdy ... rounding up\n");
}
}
else {
sector_count_t sector_offset;
lba_t cylinder_start;
if (starts_on_cylinder_boundary(ld,freespace->start)==TRUE) {
cylinder_start = rounddown_to_cylinder_boundary(ld,seg->start);
sector_offset = seg->start - cylinder_start;
start = freespace->start + sector_offset;
}
else {
start = freespace->start;
}
}
trg->start = start;
// now calculate the ending LBA ... always must end on a cyl boundary
end = trg->start + seg->size - 1;
if (ends_on_cylinder_boundary(ld,end)==FALSE) {
end = roundup_to_cylinder_boundary(ld,end);
}
if (end <= freespace->start+freespace->size-1 ) {
trg->size = end - trg->start + 1;
*target=trg;
rc = 0;
}
}
if (rc || testing==TRUE) {
if (trg) free_gpt_disk_segment(trg);
}
LOG_EXIT_INT(rc);
return rc;
}
/* Function: validate move target
*
* Called to validate that the specified segment
* can be moved to the target freespace segment.
*/
int gpt_validate_move_target( DISKSEG *src, DISKSEG *trg )
{
LOGICALDISK *ld=NULL;
DISKSEG *tseg;
SEG_PRIVATE_DATA *src_pdata=NULL;
SEG_PRIVATE_DATA *trg_pdata=NULL;
DISK_PRIVATE_DATA *disk_pdata=NULL;
int rc=EINVAL;
LOG_ENTRY();
if (src && trg) {
if ( src->data_type == DATA_TYPE &&
trg->data_type == FREE_SPACE_TYPE ) {
ld = get_logical_disk(src);
disk_pdata = get_gpt_disk_private_data(ld);
src_pdata = (SEG_PRIVATE_DATA *) src->private_data;
trg_pdata = (SEG_PRIVATE_DATA *) trg->private_data;
if (ld && disk_pdata) {
rc = 0;
}
}
if (rc==0) {
rc = create_move_target( src, trg, &tseg, TRUE);
}
}
LOG_EXIT_INT(rc);
return rc;
}
/*
* Function: can move segment
*
* Check if the specified segment object can be moved
* elsewhere on the disk. Do so by ... checking each
* freespace segment we find ... stopping at the 1st
* freespace segment that could be used for the move.
*/
int gpt_can_move_segment( DISKSEG *seg )
{
DISKSEG *freespace=NULL;
LOGICALDISK *ld=NULL;
int rc=EINVAL;
list_element_t iter;
LOG_ENTRY();
if ( safe_to_move(seg) == TRUE ) {
ld = get_logical_disk(seg);
if (ld) {
LIST_FOR_EACH( ld->parent_objects, iter, freespace ) {
if ( (freespace->data_type == FREE_SPACE_TYPE) &&
(freespace->size >= seg->size) ) {
rc = gpt_validate_move_target(seg,freespace);
if (rc == 0) {
break;
}
}
}
}
}
LOG_EXIT_INT(rc);
return rc;
}
/*
* Function: gpt update segment info
*
* Called when finishing a move to update the partition
* table metadata info. This means we need to update
* the source segment info, i.e. where it is now located
* on the disk.
*/
static int gpt_update_segment_info( DISKSEG *src, DISKSEG *trg)
{
int rc=EINVAL;
LOGICALDISK *ld=NULL;
LOG_ENTRY();
if (src && trg) {
ld = get_logical_disk(src);
if (ld) {
// remove segments from the disks segment list cuz ...
// doing so will unregister the names and create freespace
// areas on the disk.
remove_gpt_segment_from_list( ld->parent_objects, src );
remove_gpt_segment_from_list( ld->parent_objects, trg );
// update source segment information
src->start = trg->start;
src->size = trg->size;
// reinsert the source segment
insert_gpt_segment_into_list( ld->parent_objects, src );
rc = 0;
}
}
LOG_EXIT_INT(rc);
return rc;
}
/* Function: GPT move segment
*
* Called as a seg mgr private function to move a data segment
* to a freespace area on the same disk.
*/
int gpt_move_segment( DISKSEG *src, DISKSEG *freespace )
{
int rc=EINVAL;
LOGICALDISK *ld=NULL;
DISKSEG *trg=NULL;
SEG_PRIVATE_DATA *trg_pdata=NULL;
SEG_PRIVATE_DATA *src_pdata=NULL;
DISK_PRIVATE_DATA *disk_pdata=NULL;
copy_job_t *job=NULL;
LOG_ENTRY();
if ( safe_to_move(src) == TRUE ) {
ld = get_logical_disk(src);
disk_pdata = get_gpt_disk_private_data(ld);
src_pdata = (SEG_PRIVATE_DATA *) src->private_data;
// create a move target segment
rc = create_move_target(src, freespace, &trg, FALSE);
if (rc==0) trg_pdata=(SEG_PRIVATE_DATA *)trg->private_data;
// create the engine copy job
if (rc==0) {
rc = create_copy_job( src, trg, &job );
if (rc) {
free_gpt_disk_segment( trg );
find_freespace_on_gpt_disk(ld);
}
}
// remove the freespace segment from the disk segment
// list and insert the new move-target data segment.
if (rc==0) {
remove_gpt_segment_from_list( ld->parent_objects, freespace );
free_gpt_disk_segment( freespace );
insert_gpt_segment_into_ordered_list( ld->parent_objects, trg );
disk_pdata->flags |= DISK_HAS_MOVE_PENDING;
disk_pdata->copy_job = job;
src_pdata->move_target = trg;
src->flags |= SOFLAG_DIRTY;
find_freespace_on_gpt_disk(ld);
}
}
LOG_EXIT_INT(rc);
return rc;
}
/* Function: do move segment finish
*
* Called to update partition tables after moving a segment.
*/
static int do_move_segment_finish( DISKSEG *src,
DISKSEG *trg,
int copy_rc,
boolean offline )
{
int rc=EINVAL;
LOGICALDISK *ld=NULL;
SEG_PRIVATE_DATA *src_pdata=NULL;
SEG_PRIVATE_DATA *trg_pdata=NULL;
DISK_PRIVATE_DATA *disk_pdata=NULL;
DISKSEG saved_seg;
LOG_ENTRY();
if (src && trg) {
ld = get_logical_disk(src);
disk_pdata = get_gpt_disk_private_data(ld);
src_pdata = (SEG_PRIVATE_DATA *)src->private_data;
trg_pdata = (SEG_PRIVATE_DATA *)trg->private_data;
if (copy_rc==0) {
memcpy(&saved_seg, src, sizeof(DISKSEG));
rc = gpt_update_segment_info(src,trg);
if (rc==0) {
rc = commit_guid_partition_tables( ld, trg, 1, FALSE );
if (rc==0) {
rc = commit_guid_partition_tables( ld, trg, 2, FALSE );
}
}
if (rc) {
memcpy(src, &saved_seg, sizeof(DISKSEG));
commit_guid_partition_tables( ld, src, 1, FALSE );
commit_guid_partition_tables( ld, src, 2, FALSE );
}
}
else {
rc = copy_rc;
}
src_pdata->move_target = NULL;
free_gpt_disk_segment( trg );
find_freespace_on_gpt_disk(ld);
src->flags |= SOFLAG_NEEDS_ACTIVATE;
GPT_activate( src );
}
LOG_EXIT_INT(rc);
return rc;
}
static int do_online_copy(storage_object_t *src, storage_object_t *tgt, copy_job_t *job)
{
int rc = 0;
dm_target_t *target=NULL;
LOG_ENTRY();
rc = EngFncs->copy_setup(job);
if (rc != 0) {
LOG_SERIOUS("Error code %d when setting up a copy job: %s\n", rc, EngFncs->strerror(rc));
LOG_EXIT_INT(rc);
return rc;
}
/*
* Remap the source segment object to point to the mirror rather than the
* source object.
*/
rc = EngFncs->dm_get_targets(src, &target);
if (rc == 0) {
target->data.linear->major = job->mirror->dev_major;
target->data.linear->minor = job->mirror->dev_minor;
target->data.linear->start = 0;
rc = EngFncs->dm_load_targets(src, target);
EngFncs->dm_deallocate_targets(target);
if (rc == 0) {
EngFncs->dm_set_suspended_flag(TRUE);
rc = EngFncs->dm_suspend(src, TRUE);
if (rc == 0) {
rc = EngFncs->copy_start(job);
if (rc) {
EngFncs->dm_clear_targets(src);
}
EngFncs->dm_suspend(src, FALSE);
}
else {
LOG_SERIOUS("Error code %d when resuming object %s: %s\n",
rc, src->name, EngFncs->strerror(rc));
}
EngFncs->dm_set_suspended_flag(FALSE);
}
else {
LOG_SERIOUS("Error code %d when loading the new mirror target for the object %s: %s\n",
rc, src->name, EngFncs->strerror(rc));
}
}
else {
LOG_SERIOUS("Error code %d when getting the target for the object %s: %s\n",
rc, src->name, EngFncs->strerror(rc));
}
if (rc == 0) {
rc = EngFncs->copy_wait(job);
}
rc = do_move_segment_finish( src, tgt, rc, FALSE);
EngFncs->copy_cleanup(job);
LOG_EXIT_INT(rc);
return rc;
}
static int do_offline_copy( storage_object_t *src, storage_object_t *tgt, copy_job_t *job )
{
int rc = 0;
LOG_ENTRY();
rc = EngFncs->offline_copy( job);
rc = do_move_segment_finish( src, tgt, rc, TRUE);
LOG_EXIT_INT(rc);
return rc;
}
/*
* Function: gpt move commit
*
* Called during MOVE commit phase to commit a segment
* move to disk. This is done by calling the engine copy
* service and afterwards calling our own move finish
* routine that takes care of committing metadata changes
* or backing out changes.
*/
int gpt_move_segment_commit( DISKSEG *src, DISKSEG *tgt, copy_job_t *job )
{
int rc=0;
char * choices[] = {_("Yes"), _("No"), NULL};
int answer = 0;
logical_volume_t *vol=NULL;
LOG_ENTRY();
if (EngFncs->can_online_copy()) {
rc = do_online_copy(src, tgt, job);
}
else {
if (EngFncs->is_offline(src,&vol)==FALSE) {
LOG_DEBUG("Segment %s appears to be part of mounted volume %s\n", src->name, vol->name);
QUESTION( &answer, choices,
"Segment %s appears to be part of a mounted volume. The volume is %s.\n\n"
"Offline move can safely be used only with unmounted volumes. The volume may "
"become unuseable if you continue with the move.\n\n"
"Question: Would you like to continue and move segment %s?\n",
src->name, vol->name, src->name);
if (answer != 0) {
rc=EPERM;
LOG_DEBUG("User is cancelling move\n");
}
}
if (rc==0) {
rc = do_offline_copy(src, tgt, job);
}
}
src->flags &= ~SOFLAG_DIRTY; // always exit with dirty flag cleared
LOG_EXIT_INT(rc);
return rc;
}
|