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This client driver allows you to use a GPIO pin as a source for PPS
[linux-2.6/next.git] / fs / exofs / ore.c
blob25305af881983a0bd78daecdcec0c63355de0f67
1 /*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
6 *
7 * This file is part of exofs.
8 *
9 * exofs is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation. Since it is based on ext2, and the only
12 * valid version of GPL for the Linux kernel is version 2, the only valid
13 * version of GPL for exofs is version 2.
14 *
15 * exofs is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with exofs; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include <linux/slab.h>
26 #include <asm/div64.h>
27
28 #include <scsi/osd_ore.h>
29
30 #define ORE_ERR(fmt, a...) printk(KERN_ERR "ore: " fmt, ##a)
31
32 #ifdef CONFIG_EXOFS_DEBUG
33 #define ORE_DBGMSG(fmt, a...) \
34 printk(KERN_NOTICE "ore @%s:%d: " fmt, __func__, __LINE__, ##a)
35 #else
36 #define ORE_DBGMSG(fmt, a...) \
37 do { if (0) printk(fmt, ##a); } while (0)
38 #endif
39
40 /* u64 has problems with printk this will cast it to unsigned long long */
41 #define _LLU(x) (unsigned long long)(x)
42
43 #define ORE_DBGMSG2(M...) do {} while (0)
44 /* #define ORE_DBGMSG2 ORE_DBGMSG */
45
46 MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
47 MODULE_DESCRIPTION("Objects Raid Engine ore.ko");
48 MODULE_LICENSE("GPL");
49
50 static u8 *_ios_cred(struct ore_io_state *ios, unsigned index)
51 {
52 return ios->comps->comps[index & ios->comps->single_comp].cred;
53 }
54
55 static struct osd_obj_id *_ios_obj(struct ore_io_state *ios, unsigned index)
56 {
57 return &ios->comps->comps[index & ios->comps->single_comp].obj;
58 }
59
60 static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index)
61 {
62 return ios->comps->ods[index];
63 }
64
65 int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
66 bool is_reading, u64 offset, u64 length,
67 struct ore_io_state **pios)
68 {
69 struct ore_io_state *ios;
70
71 /*TODO: Maybe use kmem_cach per sbi of size
72 * exofs_io_state_size(layout->s_numdevs)
73 */
74 ios = kzalloc(ore_io_state_size(comps->numdevs), GFP_KERNEL);
75 if (unlikely(!ios)) {
76 ORE_DBGMSG("Failed kzalloc bytes=%d\n",
77 ore_io_state_size(comps->numdevs));
78 *pios = NULL;
79 return -ENOMEM;
80 }
81
82 ios->layout = layout;
83 ios->comps = comps;
84 ios->offset = offset;
85 ios->length = length;
86 ios->reading = is_reading;
87
88 *pios = ios;
89 return 0;
90 }
91 EXPORT_SYMBOL(ore_get_rw_state);
92
93 int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
94 struct ore_io_state **ios)
95 {
96 return ore_get_rw_state(layout, comps, true, 0, 0, ios);
97 }
98 EXPORT_SYMBOL(ore_get_io_state);
99
100 void ore_put_io_state(struct ore_io_state *ios)
101 {
102 if (ios) {
103 unsigned i;
104
105 for (i = 0; i < ios->numdevs; i++) {
106 struct ore_per_dev_state *per_dev = &ios->per_dev[i];
107
108 if (per_dev->or)
109 osd_end_request(per_dev->or);
110 if (per_dev->bio)
111 bio_put(per_dev->bio);
112 }
113
114 kfree(ios);
115 }
116 }
117 EXPORT_SYMBOL(ore_put_io_state);
118
119 static void _sync_done(struct ore_io_state *ios, void *p)
120 {
121 struct completion *waiting = p;
122
123 complete(waiting);
124 }
125
126 static void _last_io(struct kref *kref)
127 {
128 struct ore_io_state *ios = container_of(
129 kref, struct ore_io_state, kref);
130
131 ios->done(ios, ios->private);
132 }
133
134 static void _done_io(struct osd_request *or, void *p)
135 {
136 struct ore_io_state *ios = p;
137
138 kref_put(&ios->kref, _last_io);
139 }
140
141 static int ore_io_execute(struct ore_io_state *ios)
142 {
143 DECLARE_COMPLETION_ONSTACK(wait);
144 bool sync = (ios->done == NULL);
145 int i, ret;
146
147 if (sync) {
148 ios->done = _sync_done;
149 ios->private = &wait;
150 }
151
152 for (i = 0; i < ios->numdevs; i++) {
153 struct osd_request *or = ios->per_dev[i].or;
154 if (unlikely(!or))
155 continue;
156
157 ret = osd_finalize_request(or, 0, _ios_cred(ios, i), NULL);
158 if (unlikely(ret)) {
159 ORE_DBGMSG("Failed to osd_finalize_request() => %d\n",
160 ret);
161 return ret;
162 }
163 }
164
165 kref_init(&ios->kref);
166
167 for (i = 0; i < ios->numdevs; i++) {
168 struct osd_request *or = ios->per_dev[i].or;
169 if (unlikely(!or))
170 continue;
171
172 kref_get(&ios->kref);
173 osd_execute_request_async(or, _done_io, ios);
174 }
175
176 kref_put(&ios->kref, _last_io);
177 ret = 0;
178
179 if (sync) {
180 wait_for_completion(&wait);
181 ret = ore_check_io(ios, NULL);
182 }
183 return ret;
184 }
185
186 static void _clear_bio(struct bio *bio)
187 {
188 struct bio_vec *bv;
189 unsigned i;
190
191 __bio_for_each_segment(bv, bio, i, 0) {
192 unsigned this_count = bv->bv_len;
193
194 if (likely(PAGE_SIZE == this_count))
195 clear_highpage(bv->bv_page);
196 else
197 zero_user(bv->bv_page, bv->bv_offset, this_count);
198 }
199 }
200
201 int ore_check_io(struct ore_io_state *ios, u64 *resid)
202 {
203 enum osd_err_priority acumulated_osd_err = 0;
204 int acumulated_lin_err = 0;
205 int i;
206
207 for (i = 0; i < ios->numdevs; i++) {
208 struct osd_sense_info osi;
209 struct osd_request *or = ios->per_dev[i].or;
210 int ret;
211
212 if (unlikely(!or))
213 continue;
214
215 ret = osd_req_decode_sense(or, &osi);
216 if (likely(!ret))
217 continue;
218
219 if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
220 /* start read offset passed endof file */
221 _clear_bio(ios->per_dev[i].bio);
222 ORE_DBGMSG("start read offset passed end of file "
223 "offset=0x%llx, length=0x%llx\n",
224 _LLU(ios->per_dev[i].offset),
225 _LLU(ios->per_dev[i].length));
226
227 continue; /* we recovered */
228 }
229
230 if (osi.osd_err_pri >= acumulated_osd_err) {
231 acumulated_osd_err = osi.osd_err_pri;
232 acumulated_lin_err = ret;
233 }
234 }
235
236 /* TODO: raid specific residual calculations */
237 if (resid) {
238 if (likely(!acumulated_lin_err))
239 *resid = 0;
240 else
241 *resid = ios->length;
242 }
243
244 return acumulated_lin_err;
245 }
246 EXPORT_SYMBOL(ore_check_io);
247
248 /*
249 * L - logical offset into the file
250 *
251 * U - The number of bytes in a stripe within a group
252 *
253 * U = stripe_unit * group_width
254 *
255 * T - The number of bytes striped within a group of component objects
256 * (before advancing to the next group)
257 *
258 * T = stripe_unit * group_width * group_depth
259 *
260 * S - The number of bytes striped across all component objects
261 * before the pattern repeats
262 *
263 * S = stripe_unit * group_width * group_depth * group_count
264 *
265 * M - The "major" (i.e., across all components) stripe number
266 *
267 * M = L / S
268 *
269 * G - Counts the groups from the beginning of the major stripe
270 *
271 * G = (L - (M * S)) / T [or (L % S) / T]
272 *
273 * H - The byte offset within the group
274 *
275 * H = (L - (M * S)) % T [or (L % S) % T]
276 *
277 * N - The "minor" (i.e., across the group) stripe number
278 *
279 * N = H / U
280 *
281 * C - The component index coresponding to L
282 *
283 * C = (H - (N * U)) / stripe_unit + G * group_width
284 * [or (L % U) / stripe_unit + G * group_width]
285 *
286 * O - The component offset coresponding to L
287 *
288 * O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit
289 */
290 struct _striping_info {
291 u64 obj_offset;
292 u64 group_length;
293 u64 M; /* for truncate */
294 unsigned dev;
295 unsigned unit_off;
296 };
297
298 static void _calc_stripe_info(struct ore_layout *layout, u64 file_offset,
299 struct _striping_info *si)
300 {
301 u32 stripe_unit = layout->stripe_unit;
302 u32 group_width = layout->group_width;
303 u64 group_depth = layout->group_depth;
304
305 u32 U = stripe_unit * group_width;
306 u64 T = U * group_depth;
307 u64 S = T * layout->group_count;
308 u64 M = div64_u64(file_offset, S);
309
310 /*
311 G = (L - (M * S)) / T
312 H = (L - (M * S)) % T
313 */
314 u64 LmodS = file_offset - M * S;
315 u32 G = div64_u64(LmodS, T);
316 u64 H = LmodS - G * T;
317
318 u32 N = div_u64(H, U);
319
320 /* "H - (N * U)" is just "H % U" so it's bound to u32 */
321 si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
322 si->dev *= layout->mirrors_p1;
323
324 div_u64_rem(file_offset, stripe_unit, &si->unit_off);
325
326 si->obj_offset = si->unit_off + (N * stripe_unit) +
327 (M * group_depth * stripe_unit);
328
329 si->group_length = T - H;
330 si->M = M;
331 }
332
333 static int _add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg,
334 unsigned pgbase, struct ore_per_dev_state *per_dev,
335 int cur_len)
336 {
337 unsigned pg = *cur_pg;
338 struct request_queue *q =
339 osd_request_queue(_ios_od(ios, per_dev->dev));
340
341 per_dev->length += cur_len;
342
343 if (per_dev->bio == NULL) {
344 unsigned pages_in_stripe = ios->layout->group_width *
345 (ios->layout->stripe_unit / PAGE_SIZE);
346 unsigned bio_size = (ios->nr_pages + pages_in_stripe) /
347 ios->layout->group_width;
348
349 per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size);
350 if (unlikely(!per_dev->bio)) {
351 ORE_DBGMSG("Failed to allocate BIO size=%u\n",
352 bio_size);
353 return -ENOMEM;
354 }
355 }
356
357 while (cur_len > 0) {
358 unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
359 unsigned added_len;
360
361 BUG_ON(ios->nr_pages <= pg);
362 cur_len -= pglen;
363
364 added_len = bio_add_pc_page(q, per_dev->bio, ios->pages[pg],
365 pglen, pgbase);
366 if (unlikely(pglen != added_len))
367 return -ENOMEM;
368 pgbase = 0;
369 ++pg;
370 }
371 BUG_ON(cur_len);
372
373 *cur_pg = pg;
374 return 0;
375 }
376
377 static int _prepare_one_group(struct ore_io_state *ios, u64 length,
378 struct _striping_info *si)
379 {
380 unsigned stripe_unit = ios->layout->stripe_unit;
381 unsigned mirrors_p1 = ios->layout->mirrors_p1;
382 unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
383 unsigned dev = si->dev;
384 unsigned first_dev = dev - (dev % devs_in_group);
385 unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
386 unsigned cur_pg = ios->pages_consumed;
387 int ret = 0;
388
389 while (length) {
390 struct ore_per_dev_state *per_dev = &ios->per_dev[dev];
391 unsigned cur_len, page_off = 0;
392
393 if (!per_dev->length) {
394 per_dev->dev = dev;
395 if (dev < si->dev) {
396 per_dev->offset = si->obj_offset + stripe_unit -
397 si->unit_off;
398 cur_len = stripe_unit;
399 } else if (dev == si->dev) {
400 per_dev->offset = si->obj_offset;
401 cur_len = stripe_unit - si->unit_off;
402 page_off = si->unit_off & ~PAGE_MASK;
403 BUG_ON(page_off && (page_off != ios->pgbase));
404 } else { /* dev > si->dev */
405 per_dev->offset = si->obj_offset - si->unit_off;
406 cur_len = stripe_unit;
407 }
408
409 if (max_comp < dev)
410 max_comp = dev;
411 } else {
412 cur_len = stripe_unit;
413 }
414 if (cur_len >= length)
415 cur_len = length;
416
417 ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
418 cur_len);
419 if (unlikely(ret))
420 goto out;
421
422 dev += mirrors_p1;
423 dev = (dev % devs_in_group) + first_dev;
424
425 length -= cur_len;
426 }
427 out:
428 ios->numdevs = max_comp + mirrors_p1;
429 ios->pages_consumed = cur_pg;
430 return ret;
431 }
432
433 static int _prepare_for_striping(struct ore_io_state *ios)
434 {
435 u64 length = ios->length;
436 u64 offset = ios->offset;
437 struct _striping_info si;
438 int ret = 0;
439
440 if (!ios->pages) {
441 if (ios->kern_buff) {
442 struct ore_per_dev_state *per_dev = &ios->per_dev[0];
443
444 _calc_stripe_info(ios->layout, ios->offset, &si);
445 per_dev->offset = si.obj_offset;
446 per_dev->dev = si.dev;
447
448 /* no cross device without page array */
449 BUG_ON((ios->layout->group_width > 1) &&
450 (si.unit_off + ios->length >
451 ios->layout->stripe_unit));
452 }
453 ios->numdevs = ios->layout->mirrors_p1;
454 return 0;
455 }
456
457 while (length) {
458 _calc_stripe_info(ios->layout, offset, &si);
459
460 if (length < si.group_length)
461 si.group_length = length;
462
463 ret = _prepare_one_group(ios, si.group_length, &si);
464 if (unlikely(ret))
465 goto out;
466
467 offset += si.group_length;
468 length -= si.group_length;
469 }
470
471 out:
472 return ret;
473 }
474
475 int ore_create(struct ore_io_state *ios)
476 {
477 int i, ret;
478
479 for (i = 0; i < ios->comps->numdevs; i++) {
480 struct osd_request *or;
481
482 or = osd_start_request(_ios_od(ios, i), GFP_KERNEL);
483 if (unlikely(!or)) {
484 ORE_ERR("%s: osd_start_request failed\n", __func__);
485 ret = -ENOMEM;
486 goto out;
487 }
488 ios->per_dev[i].or = or;
489 ios->numdevs++;
490
491 osd_req_create_object(or, _ios_obj(ios, i));
492 }
493 ret = ore_io_execute(ios);
494
495 out:
496 return ret;
497 }
498 EXPORT_SYMBOL(ore_create);
499
500 int ore_remove(struct ore_io_state *ios)
501 {
502 int i, ret;
503
504 for (i = 0; i < ios->comps->numdevs; i++) {
505 struct osd_request *or;
506
507 or = osd_start_request(_ios_od(ios, i), GFP_KERNEL);
508 if (unlikely(!or)) {
509 ORE_ERR("%s: osd_start_request failed\n", __func__);
510 ret = -ENOMEM;
511 goto out;
512 }
513 ios->per_dev[i].or = or;
514 ios->numdevs++;
515
516 osd_req_remove_object(or, _ios_obj(ios, i));
517 }
518 ret = ore_io_execute(ios);
519
520 out:
521 return ret;
522 }
523 EXPORT_SYMBOL(ore_remove);
524
525 static int _write_mirror(struct ore_io_state *ios, int cur_comp)
526 {
527 struct ore_per_dev_state *master_dev = &ios->per_dev[cur_comp];
528 unsigned dev = ios->per_dev[cur_comp].dev;
529 unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
530 int ret = 0;
531
532 if (ios->pages && !master_dev->length)
533 return 0; /* Just an empty slot */
534
535 for (; cur_comp < last_comp; ++cur_comp, ++dev) {
536 struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp];
537 struct osd_request *or;
538
539 or = osd_start_request(_ios_od(ios, dev), GFP_KERNEL);
540 if (unlikely(!or)) {
541 ORE_ERR("%s: osd_start_request failed\n", __func__);
542 ret = -ENOMEM;
543 goto out;
544 }
545 per_dev->or = or;
546 per_dev->offset = master_dev->offset;
547
548 if (ios->pages) {
549 struct bio *bio;
550
551 if (per_dev != master_dev) {
552 bio = bio_kmalloc(GFP_KERNEL,
553 master_dev->bio->bi_max_vecs);
554 if (unlikely(!bio)) {
555 ORE_DBGMSG(
556 "Failed to allocate BIO size=%u\n",
557 master_dev->bio->bi_max_vecs);
558 ret = -ENOMEM;
559 goto out;
560 }
561
562 __bio_clone(bio, master_dev->bio);
563 bio->bi_bdev = NULL;
564 bio->bi_next = NULL;
565 per_dev->length = master_dev->length;
566 per_dev->bio = bio;
567 per_dev->dev = dev;
568 } else {
569 bio = master_dev->bio;
570 /* FIXME: bio_set_dir() */
571 bio->bi_rw |= REQ_WRITE;
572 }
573
574 osd_req_write(or, _ios_obj(ios, dev), per_dev->offset,
575 bio, per_dev->length);
576 ORE_DBGMSG("write(0x%llx) offset=0x%llx "
577 "length=0x%llx dev=%d\n",
578 _LLU(_ios_obj(ios, dev)->id),
579 _LLU(per_dev->offset),
580 _LLU(per_dev->length), dev);
581 } else if (ios->kern_buff) {
582 ret = osd_req_write_kern(or, _ios_obj(ios, dev),
583 per_dev->offset,
584 ios->kern_buff, ios->length);
585 if (unlikely(ret))
586 goto out;
587 ORE_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
588 "length=0x%llx dev=%d\n",
589 _LLU(_ios_obj(ios, dev)->id),
590 _LLU(per_dev->offset),
591 _LLU(ios->length), dev);
592 } else {
593 osd_req_set_attributes(or, _ios_obj(ios, dev));
594 ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
595 _LLU(_ios_obj(ios, dev)->id),
596 ios->out_attr_len, dev);
597 }
598
599 if (ios->out_attr)
600 osd_req_add_set_attr_list(or, ios->out_attr,
601 ios->out_attr_len);
602
603 if (ios->in_attr)
604 osd_req_add_get_attr_list(or, ios->in_attr,
605 ios->in_attr_len);
606 }
607
608 out:
609 return ret;
610 }
611
612 int ore_write(struct ore_io_state *ios)
613 {
614 int i;
615 int ret;
616
617 ret = _prepare_for_striping(ios);
618 if (unlikely(ret))
619 return ret;
620
621 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
622 ret = _write_mirror(ios, i);
623 if (unlikely(ret))
624 return ret;
625 }
626
627 ret = ore_io_execute(ios);
628 return ret;
629 }
630 EXPORT_SYMBOL(ore_write);
631
632 static int _read_mirror(struct ore_io_state *ios, unsigned cur_comp)
633 {
634 struct osd_request *or;
635 struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp];
636 struct osd_obj_id *obj = _ios_obj(ios, cur_comp);
637 unsigned first_dev = (unsigned)obj->id;
638
639 if (ios->pages && !per_dev->length)
640 return 0; /* Just an empty slot */
641
642 first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1;
643 or = osd_start_request(_ios_od(ios, first_dev), GFP_KERNEL);
644 if (unlikely(!or)) {
645 ORE_ERR("%s: osd_start_request failed\n", __func__);
646 return -ENOMEM;
647 }
648 per_dev->or = or;
649
650 if (ios->pages) {
651 osd_req_read(or, obj, per_dev->offset,
652 per_dev->bio, per_dev->length);
653 ORE_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
654 " dev=%d\n", _LLU(obj->id),
655 _LLU(per_dev->offset), _LLU(per_dev->length),
656 first_dev);
657 } else if (ios->kern_buff) {
658 int ret = osd_req_read_kern(or, obj, per_dev->offset,
659 ios->kern_buff, ios->length);
660 ORE_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
661 "length=0x%llx dev=%d ret=>%d\n",
662 _LLU(obj->id), _LLU(per_dev->offset),
663 _LLU(ios->length), first_dev, ret);
664 if (unlikely(ret))
665 return ret;
666 } else {
667 osd_req_get_attributes(or, obj);
668 ORE_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
669 _LLU(obj->id),
670 ios->in_attr_len, first_dev);
671 }
672 if (ios->out_attr)
673 osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len);
674
675 if (ios->in_attr)
676 osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
677
678 return 0;
679 }
680
681 int ore_read(struct ore_io_state *ios)
682 {
683 int i;
684 int ret;
685
686 ret = _prepare_for_striping(ios);
687 if (unlikely(ret))
688 return ret;
689
690 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
691 ret = _read_mirror(ios, i);
692 if (unlikely(ret))
693 return ret;
694 }
695
696 ret = ore_io_execute(ios);
697 return ret;
698 }
699 EXPORT_SYMBOL(ore_read);
700
701 int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr)
702 {
703 struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
704 void *iter = NULL;
705 int nelem;
706
707 do {
708 nelem = 1;
709 osd_req_decode_get_attr_list(ios->per_dev[0].or,
710 &cur_attr, &nelem, &iter);
711 if ((cur_attr.attr_page == attr->attr_page) &&
712 (cur_attr.attr_id == attr->attr_id)) {
713 attr->len = cur_attr.len;
714 attr->val_ptr = cur_attr.val_ptr;
715 return 0;
716 }
717 } while (iter);
718
719 return -EIO;
720 }
721 EXPORT_SYMBOL(extract_attr_from_ios);
722
723 static int _truncate_mirrors(struct ore_io_state *ios, unsigned cur_comp,
724 struct osd_attr *attr)
725 {
726 int last_comp = cur_comp + ios->layout->mirrors_p1;
727
728 for (; cur_comp < last_comp; ++cur_comp) {
729 struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp];
730 struct osd_request *or;
731
732 or = osd_start_request(_ios_od(ios, cur_comp), GFP_KERNEL);
733 if (unlikely(!or)) {
734 ORE_ERR("%s: osd_start_request failed\n", __func__);
735 return -ENOMEM;
736 }
737 per_dev->or = or;
738
739 osd_req_set_attributes(or, _ios_obj(ios, cur_comp));
740 osd_req_add_set_attr_list(or, attr, 1);
741 }
742
743 return 0;
744 }
745
746 struct _trunc_info {
747 struct _striping_info si;
748 u64 prev_group_obj_off;
749 u64 next_group_obj_off;
750
751 unsigned first_group_dev;
752 unsigned nex_group_dev;
753 unsigned max_devs;
754 };
755
756 void _calc_trunk_info(struct ore_layout *layout, u64 file_offset,
757 struct _trunc_info *ti)
758 {
759 unsigned stripe_unit = layout->stripe_unit;
760
761 _calc_stripe_info(layout, file_offset, &ti->si);
762
763 ti->prev_group_obj_off = ti->si.M * stripe_unit;
764 ti->next_group_obj_off = ti->si.M ? (ti->si.M - 1) * stripe_unit : 0;
765
766 ti->first_group_dev = ti->si.dev - (ti->si.dev % layout->group_width);
767 ti->nex_group_dev = ti->first_group_dev + layout->group_width;
768 ti->max_devs = layout->group_width * layout->group_count;
769 }
770
771 int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
772 u64 size)
773 {
774 struct ore_io_state *ios;
775 struct exofs_trunc_attr {
776 struct osd_attr attr;
777 __be64 newsize;
778 } *size_attrs;
779 struct _trunc_info ti;
780 int i, ret;
781
782 ret = ore_get_io_state(layout, comps, &ios);
783 if (unlikely(ret))
784 return ret;
785
786 _calc_trunk_info(ios->layout, size, &ti);
787
788 size_attrs = kcalloc(ti.max_devs, sizeof(*size_attrs),
789 GFP_KERNEL);
790 if (unlikely(!size_attrs)) {
791 ret = -ENOMEM;
792 goto out;
793 }
794
795 ios->numdevs = ios->comps->numdevs;
796
797 for (i = 0; i < ti.max_devs; ++i) {
798 struct exofs_trunc_attr *size_attr = &size_attrs[i];
799 u64 obj_size;
800
801 if (i < ti.first_group_dev)
802 obj_size = ti.prev_group_obj_off;
803 else if (i >= ti.nex_group_dev)
804 obj_size = ti.next_group_obj_off;
805 else if (i < ti.si.dev) /* dev within this group */
806 obj_size = ti.si.obj_offset +
807 ios->layout->stripe_unit - ti.si.unit_off;
808 else if (i == ti.si.dev)
809 obj_size = ti.si.obj_offset;
810 else /* i > ti.dev */
811 obj_size = ti.si.obj_offset - ti.si.unit_off;
812
813 size_attr->newsize = cpu_to_be64(obj_size);
814 size_attr->attr = g_attr_logical_length;
815 size_attr->attr.val_ptr = &size_attr->newsize;
816
817 ORE_DBGMSG("trunc(0x%llx) obj_offset=0x%llx dev=%d\n",
818 _LLU(comps->comps->obj.id), _LLU(obj_size), i);
819 ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1,
820 &size_attr->attr);
821 if (unlikely(ret))
822 goto out;
823 }
824 ret = ore_io_execute(ios);
825
826 out:
827 kfree(size_attrs);
828 ore_put_io_state(ios);
829 return ret;
830 }
831 EXPORT_SYMBOL(ore_truncate);
832
833 const struct osd_attr g_attr_logical_length = ATTR_DEF(
834 OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
835 EXPORT_SYMBOL(g_attr_logical_length);
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