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 unsigned dev; 309 unsigned unit_off; 310}; 311 312static void _calc_stripe_info(struct exofs_io_state *ios, u64 file_offset, 313 struct _striping_info *si) 314{ 315 u32 stripe_unit = ios->layout->stripe_unit; 316 u32 group_width = ios->layout->group_width; 317 u64 group_depth = ios->layout->group_depth; 318 319 u32 U = stripe_unit * group_width; 320 u64 T = U * group_depth; 321 u64 S = T * ios->layout->group_count; 322 u64 M = div64_u64(file_offset, S); 323 324 /* 325 G = (L - (M * S)) / T 326 H = (L - (M * S)) % T 327 */ 328 u64 LmodS = file_offset - M * S; 329 u32 G = div64_u64(LmodS, T); 330 u64 H = LmodS - G * T; 331 332 u32 N = div_u64(H, U); 333 334 /* "H - (N * U)" is just "H % U" so it's bound to u32 */ 335 si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width; 336 si->dev *= ios->layout->mirrors_p1; 337 338 div_u64_rem(file_offset, stripe_unit, &si->unit_off); 339 340 si->obj_offset = si->unit_off + (N * stripe_unit) + 341 (M * group_depth * stripe_unit); 342 343 si->group_length = T - H; 344} 345 346static int _add_stripe_unit(struct exofs_io_state *ios, unsigned *cur_pg, 347 unsigned pgbase, struct exofs_per_dev_state *per_dev, 348 int cur_len) 349{ 350 unsigned pg = *cur_pg; 351 struct request_queue *q = 352 osd_request_queue(exofs_ios_od(ios, per_dev->dev)); 353 354 per_dev->length += cur_len; 355 356 if (per_dev->bio == NULL) { 357 unsigned pages_in_stripe = ios->layout->group_width * 358 (ios->layout->stripe_unit / PAGE_SIZE); 359 unsigned bio_size = (ios->nr_pages + pages_in_stripe) / 360 ios->layout->group_width; 361 362 per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size); 363 if (unlikely(!per_dev->bio)) { 364 EXOFS_DBGMSG("Faild to allocate BIO size=%u\n", 365 bio_size); 366 return -ENOMEM; 367 } 368 } 369 370 while (cur_len > 0) { 371 unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len); 372 unsigned added_len; 373 374 BUG_ON(ios->nr_pages <= pg); 375 cur_len -= pglen; 376 377 added_len = bio_add_pc_page(q, per_dev->bio, ios->pages[pg], 378 pglen, pgbase); 379 if (unlikely(pglen != added_len)) 380 return -ENOMEM; 381 pgbase = 0; 382 ++pg; 383 } 384 BUG_ON(cur_len); 385 386 *cur_pg = pg; 387 return 0; 388} 389 390static int _prepare_one_group(struct exofs_io_state *ios, u64 length, 391 struct _striping_info *si) 392{ 393 unsigned stripe_unit = ios->layout->stripe_unit; 394 unsigned mirrors_p1 = ios->layout->mirrors_p1; 395 unsigned devs_in_group = ios->layout->group_width * mirrors_p1; 396 unsigned dev = si->dev; 397 unsigned first_dev = dev - (dev % devs_in_group); 398 unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0; 399 unsigned cur_pg = ios->pages_consumed; 400 int ret = 0; 401 402 while (length) { 403 struct exofs_per_dev_state *per_dev = &ios->per_dev[dev]; 404 unsigned cur_len, page_off = 0; 405 406 if (!per_dev->length) { 407 per_dev->dev = dev; 408 if (dev < si->dev) { 409 per_dev->offset = si->obj_offset + stripe_unit - 410 si->unit_off; 411 cur_len = stripe_unit; 412 } else if (dev == si->dev) { 413 per_dev->offset = si->obj_offset; 414 cur_len = stripe_unit - si->unit_off; 415 page_off = si->unit_off & ~PAGE_MASK; 416 BUG_ON(page_off && (page_off != ios->pgbase)); 417 } else { /* dev > si->dev */ 418 per_dev->offset = si->obj_offset - si->unit_off; 419 cur_len = stripe_unit; 420 } 421 422 if (max_comp < dev) 423 max_comp = dev; 424 } else { 425 cur_len = stripe_unit; 426 } 427 if (cur_len >= length) 428 cur_len = length; 429 430 ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev, 431 cur_len); 432 if (unlikely(ret)) 433 goto out; 434 435 dev += mirrors_p1; 436 dev = (dev % devs_in_group) + first_dev; 437 438 length -= cur_len; 439 } 440out: 441 ios->numdevs = max_comp + mirrors_p1; 442 ios->pages_consumed = cur_pg; 443 return ret; 444} 445 446static int _prepare_for_striping(struct exofs_io_state *ios) 447{ 448 u64 length = ios->length; 449 u64 offset = ios->offset; 450 struct _striping_info si; 451 int ret = 0; 452 453 if (!ios->pages) { 454 if (ios->kern_buff) { 455 struct exofs_per_dev_state *per_dev = &ios->per_dev[0]; 456 457 _calc_stripe_info(ios, ios->offset, &si); 458 per_dev->offset = si.obj_offset; 459 per_dev->dev = si.dev; 460 461 /* no cross device without page array */ 462 BUG_ON((ios->layout->group_width > 1) && 463 (si.unit_off + ios->length > 464 ios->layout->stripe_unit)); 465 } 466 ios->numdevs = ios->layout->mirrors_p1; 467 return 0; 468 } 469 470 while (length) { 471 _calc_stripe_info(ios, offset, &si); 472 473 if (length < si.group_length) 474 si.group_length = length; 475 476 ret = _prepare_one_group(ios, si.group_length, &si); 477 if (unlikely(ret)) 478 goto out; 479 480 offset += si.group_length; 481 length -= si.group_length; 482 } 483 484out: 485 return ret; 486} 487 488int exofs_sbi_create(struct exofs_io_state *ios) 489{ 490 int i, ret; 491 492 for (i = 0; i < ios->layout->s_numdevs; i++) { 493 struct osd_request *or; 494 495 or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL); 496 if (unlikely(!or)) { 497 EXOFS_ERR("%s: osd_start_request failed\n", __func__); 498 ret = -ENOMEM; 499 goto out; 500 } 501 ios->per_dev[i].or = or; 502 ios->numdevs++; 503 504 osd_req_create_object(or, &ios->obj); 505 } 506 ret = exofs_io_execute(ios); 507 508out: 509 return ret; 510} 511 512int exofs_sbi_remove(struct exofs_io_state *ios) 513{ 514 int i, ret; 515 516 for (i = 0; i < ios->layout->s_numdevs; i++) { 517 struct osd_request *or; 518 519 or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL); 520 if (unlikely(!or)) { 521 EXOFS_ERR("%s: osd_start_request failed\n", __func__); 522 ret = -ENOMEM; 523 goto out; 524 } 525 ios->per_dev[i].or = or; 526 ios->numdevs++; 527 528 osd_req_remove_object(or, &ios->obj); 529 } 530 ret = exofs_io_execute(ios); 531 532out: 533 return ret; 534} 535 536static int _sbi_write_mirror(struct exofs_io_state *ios, int cur_comp) 537{ 538 struct exofs_per_dev_state *master_dev = &ios->per_dev[cur_comp]; 539 unsigned dev = ios->per_dev[cur_comp].dev; 540 unsigned last_comp = cur_comp + ios->layout->mirrors_p1; 541 int ret = 0; 542 543 if (ios->pages && !master_dev->length) 544 return 0; /* Just an empty slot */ 545 546 for (; cur_comp < last_comp; ++cur_comp, ++dev) { 547 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp]; 548 struct osd_request *or; 549 550 or = osd_start_request(exofs_ios_od(ios, dev), GFP_KERNEL); 551 if (unlikely(!or)) { 552 EXOFS_ERR("%s: osd_start_request failed\n", __func__); 553 ret = -ENOMEM; 554 goto out; 555 } 556 per_dev->or = or; 557 per_dev->offset = master_dev->offset; 558 559 if (ios->pages) { 560 struct bio *bio; 561 562 if (per_dev != master_dev) { 563 bio = bio_kmalloc(GFP_KERNEL, 564 master_dev->bio->bi_max_vecs); 565 if (unlikely(!bio)) { 566 EXOFS_DBGMSG( 567 "Faild to allocate BIO size=%u\n", 568 master_dev->bio->bi_max_vecs); 569 ret = -ENOMEM; 570 goto out; 571 } 572 573 __bio_clone(bio, master_dev->bio); 574 bio->bi_bdev = NULL; 575 bio->bi_next = NULL; 576 per_dev->length = master_dev->length; 577 per_dev->bio = bio; 578 per_dev->dev = dev; 579 } else { 580 bio = master_dev->bio; 581 bio->bi_rw |= REQ_WRITE; 582 } 583 584 osd_req_write(or, &ios->obj, per_dev->offset, bio, 585 per_dev->length); 586 EXOFS_DBGMSG("write(0x%llx) offset=0x%llx " 587 "length=0x%llx dev=%d\n", 588 _LLU(ios->obj.id), _LLU(per_dev->offset), 589 _LLU(per_dev->length), dev); 590 } else if (ios->kern_buff) { 591 ret = osd_req_write_kern(or, &ios->obj, per_dev->offset, 592 ios->kern_buff, ios->length); 593 if (unlikely(ret)) 594 goto out; 595 EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx " 596 "length=0x%llx dev=%d\n", 597 _LLU(ios->obj.id), _LLU(per_dev->offset), 598 _LLU(ios->length), dev); 599 } else { 600 osd_req_set_attributes(or, &ios->obj); 601 EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n", 602 _LLU(ios->obj.id), ios->out_attr_len, dev); 603 } 604 605 if (ios->out_attr) 606 osd_req_add_set_attr_list(or, ios->out_attr, 607 ios->out_attr_len); 608 609 if (ios->in_attr) 610 osd_req_add_get_attr_list(or, ios->in_attr, 611 ios->in_attr_len); 612 } 613 614out: 615 return ret; 616} 617 618int exofs_sbi_write(struct exofs_io_state *ios) 619{ 620 int i; 621 int ret; 622 623 ret = _prepare_for_striping(ios); 624 if (unlikely(ret)) 625 return ret; 626 627 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { 628 ret = _sbi_write_mirror(ios, i); 629 if (unlikely(ret)) 630 return ret; 631 } 632 633 ret = exofs_io_execute(ios); 634 return ret; 635} 636 637static int _sbi_read_mirror(struct exofs_io_state *ios, unsigned cur_comp) 638{ 639 struct osd_request *or; 640 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp]; 641 unsigned first_dev = (unsigned)ios->obj.id; 642 643 if (ios->pages && !per_dev->length) 644 return 0; /* Just an empty slot */ 645 646 first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1; 647 or = osd_start_request(exofs_ios_od(ios, first_dev), GFP_KERNEL); 648 if (unlikely(!or)) { 649 EXOFS_ERR("%s: osd_start_request failed\n", __func__); 650 return -ENOMEM; 651 } 652 per_dev->or = or; 653 654 if (ios->pages) { 655 osd_req_read(or, &ios->obj, per_dev->offset, 656 per_dev->bio, per_dev->length); 657 EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx" 658 " dev=%d\n", _LLU(ios->obj.id), 659 _LLU(per_dev->offset), _LLU(per_dev->length), 660 first_dev); 661 } else if (ios->kern_buff) { 662 int ret = osd_req_read_kern(or, &ios->obj, per_dev->offset, 663 ios->kern_buff, ios->length); 664 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx " 665 "length=0x%llx dev=%d ret=>%d\n", 666 _LLU(ios->obj.id), _LLU(per_dev->offset), 667 _LLU(ios->length), first_dev, ret); 668 if (unlikely(ret)) 669 return ret; 670 } else { 671 osd_req_get_attributes(or, &ios->obj); 672 EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n", 673 _LLU(ios->obj.id), ios->in_attr_len, first_dev); 674 } 675 if (ios->out_attr) 676 osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len); 677 678 if (ios->in_attr) 679 osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len); 680 681 return 0; 682} 683 684int exofs_sbi_read(struct exofs_io_state *ios) 685{ 686 int i; 687 int ret; 688 689 ret = _prepare_for_striping(ios); 690 if (unlikely(ret)) 691 return ret; 692 693 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { 694 ret = _sbi_read_mirror(ios, i); 695 if (unlikely(ret)) 696 return ret; 697 } 698 699 ret = exofs_io_execute(ios); 700 return ret; 701} 702 703int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr) 704{ 705 struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */ 706 void *iter = NULL; 707 int nelem; 708 709 do { 710 nelem = 1; 711 osd_req_decode_get_attr_list(ios->per_dev[0].or, 712 &cur_attr, &nelem, &iter); 713 if ((cur_attr.attr_page == attr->attr_page) && 714 (cur_attr.attr_id == attr->attr_id)) { 715 attr->len = cur_attr.len; 716 attr->val_ptr = cur_attr.val_ptr; 717 return 0; 718 } 719 } while (iter); 720 721 return -EIO; 722} 723 724static int _truncate_mirrors(struct exofs_io_state *ios, unsigned cur_comp, 725 struct osd_attr *attr) 726{ 727 int last_comp = cur_comp + ios->layout->mirrors_p1; 728 729 for (; cur_comp < last_comp; ++cur_comp) { 730 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp]; 731 struct osd_request *or; 732 733 or = osd_start_request(exofs_ios_od(ios, cur_comp), GFP_KERNEL); 734 if (unlikely(!or)) { 735 EXOFS_ERR("%s: osd_start_request failed\n", __func__); 736 return -ENOMEM; 737 } 738 per_dev->or = or; 739 740 osd_req_set_attributes(or, &ios->obj); 741 osd_req_add_set_attr_list(or, attr, 1); 742 } 743 744 return 0; 745} 746 747int exofs_oi_truncate(struct exofs_i_info *oi, u64 size) 748{ 749 struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info; 750 struct exofs_io_state *ios; 751 struct exofs_trunc_attr { 752 struct osd_attr attr; 753 __be64 newsize; 754 } *size_attrs; 755 struct _striping_info si; 756 int i, ret; 757 758 ret = exofs_get_io_state(&sbi->layout, &ios); 759 if (unlikely(ret)) 760 return ret; 761 762 size_attrs = kcalloc(ios->layout->group_width, sizeof(*size_attrs), 763 GFP_KERNEL); 764 if (unlikely(!size_attrs)) { 765 ret = -ENOMEM; 766 goto out; 767 } 768 769 ios->obj.id = exofs_oi_objno(oi); 770 ios->cred = oi->i_cred; 771 772 ios->numdevs = ios->layout->s_numdevs; 773 _calc_stripe_info(ios, size, &si); 774 775 for (i = 0; i < ios->layout->group_width; ++i) { 776 struct exofs_trunc_attr *size_attr = &size_attrs[i]; 777 u64 obj_size; 778 779 if (i < si.dev) 780 obj_size = si.obj_offset + 781 ios->layout->stripe_unit - si.unit_off; 782 else if (i == si.dev) 783 obj_size = si.obj_offset; 784 else /* i > si.dev */ 785 obj_size = si.obj_offset - si.unit_off; 786 787 size_attr->newsize = cpu_to_be64(obj_size); 788 size_attr->attr = g_attr_logical_length; 789 size_attr->attr.val_ptr = &size_attr->newsize; 790 791 ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1, 792 &size_attr->attr); 793 if (unlikely(ret)) 794 goto out; 795 } 796 ret = exofs_io_execute(ios); 797 798out: 799 kfree(size_attrs); 800 exofs_put_io_state(ios); 801 return ret; 802} 803