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-rw-r--r--fs/exofs/ios.c823
1 files changed, 823 insertions, 0 deletions
diff --git a/fs/exofs/ios.c b/fs/exofs/ios.c
new file mode 100644
index 000000000000..4337cad7777b
--- /dev/null
+++ b/fs/exofs/ios.c
@@ -0,0 +1,823 @@
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 <scsi/scsi_device.h>
27#include <asm/div64.h>
28
29#include "exofs.h"
30
31#define EXOFS_DBGMSG2(M...) do {} while (0)
32/* #define EXOFS_DBGMSG2 EXOFS_DBGMSG */
33
34void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
35{
36 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
37}
38
39int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
40 u64 offset, void *p, unsigned length)
41{
42 struct osd_request *or = osd_start_request(od, GFP_KERNEL);
43/* struct osd_sense_info osi = {.key = 0};*/
44 int ret;
45
46 if (unlikely(!or)) {
47 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
48 return -ENOMEM;
49 }
50 ret = osd_req_read_kern(or, obj, offset, p, length);
51 if (unlikely(ret)) {
52 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
53 goto out;
54 }
55
56 ret = osd_finalize_request(or, 0, cred, NULL);
57 if (unlikely(ret)) {
58 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
59 goto out;
60 }
61
62 ret = osd_execute_request(or);
63 if (unlikely(ret))
64 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
65 /* osd_req_decode_sense(or, ret); */
66
67out:
68 osd_end_request(or);
69 return ret;
70}
71
72int exofs_get_io_state(struct exofs_layout *layout,
73 struct exofs_io_state **pios)
74{
75 struct exofs_io_state *ios;
76
77 /*TODO: Maybe use kmem_cach per sbi of size
78 * exofs_io_state_size(layout->s_numdevs)
79 */
80 ios = kzalloc(exofs_io_state_size(layout->s_numdevs), GFP_KERNEL);
81 if (unlikely(!ios)) {
82 EXOFS_DBGMSG("Faild kzalloc bytes=%d\n",
83 exofs_io_state_size(layout->s_numdevs));
84 *pios = NULL;
85 return -ENOMEM;
86 }
87
88 ios->layout = layout;
89 ios->obj.partition = layout->s_pid;
90 *pios = ios;
91 return 0;
92}
93
94void exofs_put_io_state(struct exofs_io_state *ios)
95{
96 if (ios) {
97 unsigned i;
98
99 for (i = 0; i < ios->numdevs; i++) {
100 struct exofs_per_dev_state *per_dev = &ios->per_dev[i];
101
102 if (per_dev->or)
103 osd_end_request(per_dev->or);
104 if (per_dev->bio)
105 bio_put(per_dev->bio);
106 }
107
108 kfree(ios);
109 }
110}
111
112unsigned exofs_layout_od_id(struct exofs_layout *layout,
113 osd_id obj_no, unsigned layout_index)
114{
115/* switch (layout->lay_func) {
116 case LAYOUT_MOVING_WINDOW:
117 {*/
118 unsigned dev_mod = obj_no;
119
120 return (layout_index + dev_mod * layout->mirrors_p1) %
121 layout->s_numdevs;
122/* }
123 case LAYOUT_FUNC_IMPLICT:
124 return layout->devs[layout_index];
125 }*/
126}
127
128static inline struct osd_dev *exofs_ios_od(struct exofs_io_state *ios,
129 unsigned layout_index)
130{
131 return ios->layout->s_ods[
132 exofs_layout_od_id(ios->layout, ios->obj.id, layout_index)];
133}
134
135static void _sync_done(struct exofs_io_state *ios, void *p)
136{
137 struct completion *waiting = p;
138
139 complete(waiting);
140}
141
142static void _last_io(struct kref *kref)
143{
144 struct exofs_io_state *ios = container_of(
145 kref, struct exofs_io_state, kref);
146
147 ios->done(ios, ios->private);
148}
149
150static void _done_io(struct osd_request *or, void *p)
151{
152 struct exofs_io_state *ios = p;
153
154 kref_put(&ios->kref, _last_io);
155}
156
157static int exofs_io_execute(struct exofs_io_state *ios)
158{
159 DECLARE_COMPLETION_ONSTACK(wait);
160 bool sync = (ios->done == NULL);
161 int i, ret;
162
163 if (sync) {
164 ios->done = _sync_done;
165 ios->private = &wait;
166 }
167
168 for (i = 0; i < ios->numdevs; i++) {
169 struct osd_request *or = ios->per_dev[i].or;
170 if (unlikely(!or))
171 continue;
172
173 ret = osd_finalize_request(or, 0, ios->cred, NULL);
174 if (unlikely(ret)) {
175 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
176 ret);
177 return ret;
178 }
179 }
180
181 kref_init(&ios->kref);
182
183 for (i = 0; i < ios->numdevs; i++) {
184 struct osd_request *or = ios->per_dev[i].or;
185 if (unlikely(!or))
186 continue;
187
188 kref_get(&ios->kref);
189 osd_execute_request_async(or, _done_io, ios);
190 }
191
192 kref_put(&ios->kref, _last_io);
193 ret = 0;
194
195 if (sync) {
196 wait_for_completion(&wait);
197 ret = exofs_check_io(ios, NULL);
198 }
199 return ret;
200}
201
202static void _clear_bio(struct bio *bio)
203{
204 struct bio_vec *bv;
205 unsigned i;
206
207 __bio_for_each_segment(bv, bio, i, 0) {
208 unsigned this_count = bv->bv_len;
209
210 if (likely(PAGE_SIZE == this_count))
211 clear_highpage(bv->bv_page);
212 else
213 zero_user(bv->bv_page, bv->bv_offset, this_count);
214 }
215}
216
217int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
218{
219 enum osd_err_priority acumulated_osd_err = 0;
220 int acumulated_lin_err = 0;
221 int i;
222
223 for (i = 0; i < ios->numdevs; i++) {
224 struct osd_sense_info osi;
225 struct osd_request *or = ios->per_dev[i].or;
226 int ret;
227
228 if (unlikely(!or))
229 continue;
230
231 ret = osd_req_decode_sense(or, &osi);
232 if (likely(!ret))
233 continue;
234
235 if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
236 /* start read offset passed endof file */
237 _clear_bio(ios->per_dev[i].bio);
238 EXOFS_DBGMSG("start read offset passed end of file "
239 "offset=0x%llx, length=0x%llx\n",
240 _LLU(ios->per_dev[i].offset),
241 _LLU(ios->per_dev[i].length));
242
243 continue; /* we recovered */
244 }
245
246 if (osi.osd_err_pri >= acumulated_osd_err) {
247 acumulated_osd_err = osi.osd_err_pri;
248 acumulated_lin_err = ret;
249 }
250 }
251
252 /* TODO: raid specific residual calculations */
253 if (resid) {
254 if (likely(!acumulated_lin_err))
255 *resid = 0;
256 else
257 *resid = ios->length;
258 }
259
260 return acumulated_lin_err;
261}
262
263/*
264 * L - logical offset into the file
265 *
266 * U - The number of bytes in a stripe within a group
267 *
268 * U = stripe_unit * group_width
269 *
270 * T - The number of bytes striped within a group of component objects
271 * (before advancing to the next group)
272 *
273 * T = stripe_unit * group_width * group_depth
274 *
275 * S - The number of bytes striped across all component objects
276 * before the pattern repeats
277 *
278 * S = stripe_unit * group_width * group_depth * group_count
279 *
280 * M - The "major" (i.e., across all components) stripe number
281 *
282 * M = L / S
283 *
284 * G - Counts the groups from the beginning of the major stripe
285 *
286 * G = (L - (M * S)) / T [or (L % S) / T]
287 *
288 * H - The byte offset within the group
289 *
290 * H = (L - (M * S)) % T [or (L % S) % T]
291 *
292 * N - The "minor" (i.e., across the group) stripe number
293 *
294 * N = H / U
295 *
296 * C - The component index coresponding to L
297 *
298 * C = (H - (N * U)) / stripe_unit + G * group_width
299 * [or (L % U) / stripe_unit + G * group_width]
300 *
301 * O - The component offset coresponding to L
302 *
303 * O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit
304 */
305struct _striping_info {
306 u64 obj_offset;
307 u64 group_length;
308 u64 total_group_length;
309 u64 Major;
310 unsigned dev;
311 unsigned unit_off;
312};
313
314static void _calc_stripe_info(struct exofs_io_state *ios, u64 file_offset,
315 struct _striping_info *si)
316{
317 u32 stripe_unit = ios->layout->stripe_unit;
318 u32 group_width = ios->layout->group_width;
319 u64 group_depth = ios->layout->group_depth;
320
321 u32 U = stripe_unit * group_width;
322 u64 T = U * group_depth;
323 u64 S = T * ios->layout->group_count;
324 u64 M = div64_u64(file_offset, S);
325
326 /*
327 G = (L - (M * S)) / T
328 H = (L - (M * S)) % T
329 */
330 u64 LmodS = file_offset - M * S;
331 u32 G = div64_u64(LmodS, T);
332 u64 H = LmodS - G * T;
333
334 u32 N = div_u64(H, U);
335
336 /* "H - (N * U)" is just "H % U" so it's bound to u32 */
337 si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
338 si->dev *= ios->layout->mirrors_p1;
339
340 div_u64_rem(file_offset, stripe_unit, &si->unit_off);
341
342 si->obj_offset = si->unit_off + (N * stripe_unit) +
343 (M * group_depth * stripe_unit);
344
345 si->group_length = T - H;
346 si->total_group_length = T;
347 si->Major = M;
348}
349
350static int _add_stripe_unit(struct exofs_io_state *ios, unsigned *cur_pg,
351 unsigned pgbase, struct exofs_per_dev_state *per_dev,
352 int cur_len)
353{
354 unsigned pg = *cur_pg;
355 struct request_queue *q =
356 osd_request_queue(exofs_ios_od(ios, per_dev->dev));
357
358 per_dev->length += cur_len;
359
360 if (per_dev->bio == NULL) {
361 unsigned pages_in_stripe = ios->layout->group_width *
362 (ios->layout->stripe_unit / PAGE_SIZE);
363 unsigned bio_size = (ios->nr_pages + pages_in_stripe) /
364 ios->layout->group_width;
365
366 per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size);
367 if (unlikely(!per_dev->bio)) {
368 EXOFS_DBGMSG("Faild to allocate BIO size=%u\n",
369 bio_size);
370 return -ENOMEM;
371 }
372 }
373
374 while (cur_len > 0) {
375 unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
376 unsigned added_len;
377
378 BUG_ON(ios->nr_pages <= pg);
379 cur_len -= pglen;
380
381 added_len = bio_add_pc_page(q, per_dev->bio, ios->pages[pg],
382 pglen, pgbase);
383 if (unlikely(pglen != added_len))
384 return -ENOMEM;
385 pgbase = 0;
386 ++pg;
387 }
388 BUG_ON(cur_len);
389
390 *cur_pg = pg;
391 return 0;
392}
393
394static int _prepare_one_group(struct exofs_io_state *ios, u64 length,
395 struct _striping_info *si, unsigned first_comp)
396{
397 unsigned stripe_unit = ios->layout->stripe_unit;
398 unsigned mirrors_p1 = ios->layout->mirrors_p1;
399 unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
400 unsigned dev = si->dev;
401 unsigned first_dev = dev - (dev % devs_in_group);
402 unsigned comp = first_comp + (dev - first_dev);
403 unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
404 unsigned cur_pg = ios->pages_consumed;
405 int ret = 0;
406
407 while (length) {
408 struct exofs_per_dev_state *per_dev = &ios->per_dev[comp];
409 unsigned cur_len, page_off = 0;
410
411 if (!per_dev->length) {
412 per_dev->dev = dev;
413 if (dev < si->dev) {
414 per_dev->offset = si->obj_offset + stripe_unit -
415 si->unit_off;
416 cur_len = stripe_unit;
417 } else if (dev == si->dev) {
418 per_dev->offset = si->obj_offset;
419 cur_len = stripe_unit - si->unit_off;
420 page_off = si->unit_off & ~PAGE_MASK;
421 BUG_ON(page_off && (page_off != ios->pgbase));
422 } else { /* dev > si->dev */
423 per_dev->offset = si->obj_offset - si->unit_off;
424 cur_len = stripe_unit;
425 }
426
427 if (max_comp < comp)
428 max_comp = comp;
429
430 dev += mirrors_p1;
431 dev = (dev % devs_in_group) + first_dev;
432 } else {
433 cur_len = stripe_unit;
434 }
435 if (cur_len >= length)
436 cur_len = length;
437
438 ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
439 cur_len);
440 if (unlikely(ret))
441 goto out;
442
443 comp += mirrors_p1;
444 comp = (comp % devs_in_group) + first_comp;
445
446 length -= cur_len;
447 }
448out:
449 ios->numdevs = max_comp + mirrors_p1;
450 ios->pages_consumed = cur_pg;
451 return ret;
452}
453
454static int _prepare_for_striping(struct exofs_io_state *ios)
455{
456 u64 length = ios->length;
457 struct _striping_info si;
458 unsigned devs_in_group = ios->layout->group_width *
459 ios->layout->mirrors_p1;
460 unsigned first_comp = 0;
461 int ret = 0;
462
463 _calc_stripe_info(ios, ios->offset, &si);
464
465 if (!ios->pages) {
466 if (ios->kern_buff) {
467 struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
468
469 per_dev->offset = si.obj_offset;
470 per_dev->dev = si.dev;
471
472 /* no cross device without page array */
473 BUG_ON((ios->layout->group_width > 1) &&
474 (si.unit_off + ios->length >
475 ios->layout->stripe_unit));
476 }
477 ios->numdevs = ios->layout->mirrors_p1;
478 return 0;
479 }
480
481 while (length) {
482 if (length < si.group_length)
483 si.group_length = length;
484
485 ret = _prepare_one_group(ios, si.group_length, &si, first_comp);
486 if (unlikely(ret))
487 goto out;
488
489 length -= si.group_length;
490
491 si.group_length = si.total_group_length;
492 si.unit_off = 0;
493 ++si.Major;
494 si.obj_offset = si.Major * ios->layout->stripe_unit *
495 ios->layout->group_depth;
496
497 si.dev = (si.dev - (si.dev % devs_in_group)) + devs_in_group;
498 si.dev %= ios->layout->s_numdevs;
499
500 first_comp += devs_in_group;
501 first_comp %= ios->layout->s_numdevs;
502 }
503
504out:
505 return ret;
506}
507
508int exofs_sbi_create(struct exofs_io_state *ios)
509{
510 int i, ret;
511
512 for (i = 0; i < ios->layout->s_numdevs; i++) {
513 struct osd_request *or;
514
515 or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL);
516 if (unlikely(!or)) {
517 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
518 ret = -ENOMEM;
519 goto out;
520 }
521 ios->per_dev[i].or = or;
522 ios->numdevs++;
523
524 osd_req_create_object(or, &ios->obj);
525 }
526 ret = exofs_io_execute(ios);
527
528out:
529 return ret;
530}
531
532int exofs_sbi_remove(struct exofs_io_state *ios)
533{
534 int i, ret;
535
536 for (i = 0; i < ios->layout->s_numdevs; i++) {
537 struct osd_request *or;
538
539 or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL);
540 if (unlikely(!or)) {
541 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
542 ret = -ENOMEM;
543 goto out;
544 }
545 ios->per_dev[i].or = or;
546 ios->numdevs++;
547
548 osd_req_remove_object(or, &ios->obj);
549 }
550 ret = exofs_io_execute(ios);
551
552out:
553 return ret;
554}
555
556static int _sbi_write_mirror(struct exofs_io_state *ios, int cur_comp)
557{
558 struct exofs_per_dev_state *master_dev = &ios->per_dev[cur_comp];
559 unsigned dev = ios->per_dev[cur_comp].dev;
560 unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
561 int ret = 0;
562
563 if (ios->pages && !master_dev->length)
564 return 0; /* Just an empty slot */
565
566 for (; cur_comp < last_comp; ++cur_comp, ++dev) {
567 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
568 struct osd_request *or;
569
570 or = osd_start_request(exofs_ios_od(ios, dev), GFP_KERNEL);
571 if (unlikely(!or)) {
572 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
573 ret = -ENOMEM;
574 goto out;
575 }
576 per_dev->or = or;
577 per_dev->offset = master_dev->offset;
578
579 if (ios->pages) {
580 struct bio *bio;
581
582 if (per_dev != master_dev) {
583 bio = bio_kmalloc(GFP_KERNEL,
584 master_dev->bio->bi_max_vecs);
585 if (unlikely(!bio)) {
586 EXOFS_DBGMSG(
587 "Faild to allocate BIO size=%u\n",
588 master_dev->bio->bi_max_vecs);
589 ret = -ENOMEM;
590 goto out;
591 }
592
593 __bio_clone(bio, master_dev->bio);
594 bio->bi_bdev = NULL;
595 bio->bi_next = NULL;
596 per_dev->length = master_dev->length;
597 per_dev->bio = bio;
598 per_dev->dev = dev;
599 } else {
600 bio = master_dev->bio;
601 /* FIXME: bio_set_dir() */
602 bio->bi_rw |= (1 << BIO_RW);
603 }
604
605 osd_req_write(or, &ios->obj, per_dev->offset, bio,
606 per_dev->length);
607 EXOFS_DBGMSG("write(0x%llx) offset=0x%llx "
608 "length=0x%llx dev=%d\n",
609 _LLU(ios->obj.id), _LLU(per_dev->offset),
610 _LLU(per_dev->length), dev);
611 } else if (ios->kern_buff) {
612 ret = osd_req_write_kern(or, &ios->obj, per_dev->offset,
613 ios->kern_buff, ios->length);
614 if (unlikely(ret))
615 goto out;
616 EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
617 "length=0x%llx dev=%d\n",
618 _LLU(ios->obj.id), _LLU(per_dev->offset),
619 _LLU(ios->length), dev);
620 } else {
621 osd_req_set_attributes(or, &ios->obj);
622 EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
623 _LLU(ios->obj.id), ios->out_attr_len, dev);
624 }
625
626 if (ios->out_attr)
627 osd_req_add_set_attr_list(or, ios->out_attr,
628 ios->out_attr_len);
629
630 if (ios->in_attr)
631 osd_req_add_get_attr_list(or, ios->in_attr,
632 ios->in_attr_len);
633 }
634
635out:
636 return ret;
637}
638
639int exofs_sbi_write(struct exofs_io_state *ios)
640{
641 int i;
642 int ret;
643
644 ret = _prepare_for_striping(ios);
645 if (unlikely(ret))
646 return ret;
647
648 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
649 ret = _sbi_write_mirror(ios, i);
650 if (unlikely(ret))
651 return ret;
652 }
653
654 ret = exofs_io_execute(ios);
655 return ret;
656}
657
658static int _sbi_read_mirror(struct exofs_io_state *ios, unsigned cur_comp)
659{
660 struct osd_request *or;
661 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
662 unsigned first_dev = (unsigned)ios->obj.id;
663
664 if (ios->pages && !per_dev->length)
665 return 0; /* Just an empty slot */
666
667 first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1;
668 or = osd_start_request(exofs_ios_od(ios, first_dev), GFP_KERNEL);
669 if (unlikely(!or)) {
670 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
671 return -ENOMEM;
672 }
673 per_dev->or = or;
674
675 if (ios->pages) {
676 osd_req_read(or, &ios->obj, per_dev->offset,
677 per_dev->bio, per_dev->length);
678 EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
679 " dev=%d\n", _LLU(ios->obj.id),
680 _LLU(per_dev->offset), _LLU(per_dev->length),
681 first_dev);
682 } else if (ios->kern_buff) {
683 int ret = osd_req_read_kern(or, &ios->obj, per_dev->offset,
684 ios->kern_buff, ios->length);
685 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
686 "length=0x%llx dev=%d ret=>%d\n",
687 _LLU(ios->obj.id), _LLU(per_dev->offset),
688 _LLU(ios->length), first_dev, ret);
689 if (unlikely(ret))
690 return ret;
691 } else {
692 osd_req_get_attributes(or, &ios->obj);
693 EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
694 _LLU(ios->obj.id), ios->in_attr_len, first_dev);
695 }
696 if (ios->out_attr)
697 osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len);
698
699 if (ios->in_attr)
700 osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
701
702 return 0;
703}
704
705int exofs_sbi_read(struct exofs_io_state *ios)
706{
707 int i;
708 int ret;
709
710 ret = _prepare_for_striping(ios);
711 if (unlikely(ret))
712 return ret;
713
714 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
715 ret = _sbi_read_mirror(ios, i);
716 if (unlikely(ret))
717 return ret;
718 }
719
720 ret = exofs_io_execute(ios);
721 return ret;
722}
723
724int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
725{
726 struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
727 void *iter = NULL;
728 int nelem;
729
730 do {
731 nelem = 1;
732 osd_req_decode_get_attr_list(ios->per_dev[0].or,
733 &cur_attr, &nelem, &iter);
734 if ((cur_attr.attr_page == attr->attr_page) &&
735 (cur_attr.attr_id == attr->attr_id)) {
736 attr->len = cur_attr.len;
737 attr->val_ptr = cur_attr.val_ptr;
738 return 0;
739 }
740 } while (iter);
741
742 return -EIO;
743}
744
745static int _truncate_mirrors(struct exofs_io_state *ios, unsigned cur_comp,
746 struct osd_attr *attr)
747{
748 int last_comp = cur_comp + ios->layout->mirrors_p1;
749
750 for (; cur_comp < last_comp; ++cur_comp) {
751 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
752 struct osd_request *or;
753
754 or = osd_start_request(exofs_ios_od(ios, cur_comp), GFP_KERNEL);
755 if (unlikely(!or)) {
756 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
757 return -ENOMEM;
758 }
759 per_dev->or = or;
760
761 osd_req_set_attributes(or, &ios->obj);
762 osd_req_add_set_attr_list(or, attr, 1);
763 }
764
765 return 0;
766}
767
768int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
769{
770 struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
771 struct exofs_io_state *ios;
772 struct exofs_trunc_attr {
773 struct osd_attr attr;
774 __be64 newsize;
775 } *size_attrs;
776 struct _striping_info si;
777 int i, ret;
778
779 ret = exofs_get_io_state(&sbi->layout, &ios);
780 if (unlikely(ret))
781 return ret;
782
783 size_attrs = kcalloc(ios->layout->group_width, sizeof(*size_attrs),
784 GFP_KERNEL);
785 if (unlikely(!size_attrs)) {
786 ret = -ENOMEM;
787 goto out;
788 }
789
790 ios->obj.id = exofs_oi_objno(oi);
791 ios->cred = oi->i_cred;
792
793 ios->numdevs = ios->layout->s_numdevs;
794 _calc_stripe_info(ios, size, &si);
795
796 for (i = 0; i < ios->layout->group_width; ++i) {
797 struct exofs_trunc_attr *size_attr = &size_attrs[i];
798 u64 obj_size;
799
800 if (i < si.dev)
801 obj_size = si.obj_offset +
802 ios->layout->stripe_unit - si.unit_off;
803 else if (i == si.dev)
804 obj_size = si.obj_offset;
805 else /* i > si.dev */
806 obj_size = si.obj_offset - si.unit_off;
807
808 size_attr->newsize = cpu_to_be64(obj_size);
809 size_attr->attr = g_attr_logical_length;
810 size_attr->attr.val_ptr = &size_attr->newsize;
811
812 ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1,
813 &size_attr->attr);
814 if (unlikely(ret))
815 goto out;
816 }
817 ret = exofs_io_execute(ios);
818
819out:
820 kfree(size_attrs);
821 exofs_put_io_state(ios);
822 return ret;
823}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 20:33:19 -0500