1/* 2 * Copyright (C) 2005, 2006 3 * Avishay Traeger (avishay@gmail.com) 4 * Copyright (C) 2008, 2009 5 * Boaz Harrosh <ooo@electrozaur.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 <linux/module.h> 27#include <asm/div64.h> 28#include <linux/lcm.h> 29 30#include "ore_raid.h" 31 32MODULE_AUTHOR("Boaz Harrosh <ooo@electrozaur.com>"); 33MODULE_DESCRIPTION("Objects Raid Engine ore.ko"); 34MODULE_LICENSE("GPL"); 35 36/* ore_verify_layout does a couple of things: 37 * 1. Given a minimum number of needed parameters fixes up the rest of the 38 * members to be operatonals for the ore. The needed parameters are those 39 * that are defined by the pnfs-objects layout STD. 40 * 2. Check to see if the current ore code actually supports these parameters 41 * for example stripe_unit must be a multple of the system PAGE_SIZE, 42 * and etc... 43 * 3. Cache some havily used calculations that will be needed by users. 44 */ 45 46enum { BIO_MAX_PAGES_KMALLOC = 47 (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),}; 48 49int ore_verify_layout(unsigned total_comps, struct ore_layout *layout) 50{ 51 u64 stripe_length; 52 53 switch (layout->raid_algorithm) { 54 case PNFS_OSD_RAID_0: 55 layout->parity = 0; 56 break; 57 case PNFS_OSD_RAID_5: 58 layout->parity = 1; 59 break; 60 case PNFS_OSD_RAID_PQ: 61 layout->parity = 2; 62 break; 63 case PNFS_OSD_RAID_4: 64 default: 65 ORE_ERR("Only RAID_0/5/6 for now received-enum=%d\n", 66 layout->raid_algorithm); 67 return -EINVAL; 68 } 69 if (0 != (layout->stripe_unit & ~PAGE_MASK)) { 70 ORE_ERR("Stripe Unit(0x%llx)" 71 " must be Multples of PAGE_SIZE(0x%lx)\n", 72 _LLU(layout->stripe_unit), PAGE_SIZE); 73 return -EINVAL; 74 } 75 if (layout->group_width) { 76 if (!layout->group_depth) { 77 ORE_ERR("group_depth == 0 && group_width != 0\n"); 78 return -EINVAL; 79 } 80 if (total_comps < (layout->group_width * layout->mirrors_p1)) { 81 ORE_ERR("Data Map wrong, " 82 "numdevs=%d < group_width=%d * mirrors=%d\n", 83 total_comps, layout->group_width, 84 layout->mirrors_p1); 85 return -EINVAL; 86 } 87 layout->group_count = total_comps / layout->mirrors_p1 / 88 layout->group_width; 89 } else { 90 if (layout->group_depth) { 91 printk(KERN_NOTICE "Warning: group_depth ignored " 92 "group_width == 0 && group_depth == %lld\n", 93 _LLU(layout->group_depth)); 94 } 95 layout->group_width = total_comps / layout->mirrors_p1; 96 layout->group_depth = -1; 97 layout->group_count = 1; 98 } 99 100 stripe_length = (u64)layout->group_width * layout->stripe_unit; 101 if (stripe_length >= (1ULL << 32)) { 102 ORE_ERR("Stripe_length(0x%llx) >= 32bit is not supported\n", 103 _LLU(stripe_length)); 104 return -EINVAL; 105 } 106 107 layout->max_io_length = 108 (BIO_MAX_PAGES_KMALLOC * PAGE_SIZE - layout->stripe_unit) * 109 (layout->group_width - layout->parity); 110 if (layout->parity) { 111 unsigned stripe_length = 112 (layout->group_width - layout->parity) * 113 layout->stripe_unit; 114 115 layout->max_io_length /= stripe_length; 116 layout->max_io_length *= stripe_length; 117 } 118 ORE_DBGMSG("max_io_length=0x%lx\n", layout->max_io_length); 119 120 return 0; 121} 122EXPORT_SYMBOL(ore_verify_layout); 123 124static u8 *_ios_cred(struct ore_io_state *ios, unsigned index) 125{ 126 return ios->oc->comps[index & ios->oc->single_comp].cred; 127} 128 129static struct osd_obj_id *_ios_obj(struct ore_io_state *ios, unsigned index) 130{ 131 return &ios->oc->comps[index & ios->oc->single_comp].obj; 132} 133 134static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index) 135{ 136 ORE_DBGMSG2("oc->first_dev=%d oc->numdevs=%d i=%d oc->ods=%p\n", 137 ios->oc->first_dev, ios->oc->numdevs, index, 138 ios->oc->ods); 139 140 return ore_comp_dev(ios->oc, index); 141} 142 143int _ore_get_io_state(struct ore_layout *layout, 144 struct ore_components *oc, unsigned numdevs, 145 unsigned sgs_per_dev, unsigned num_par_pages, 146 struct ore_io_state **pios) 147{ 148 struct ore_io_state *ios; 149 struct page **pages; 150 struct osd_sg_entry *sgilist; 151 struct __alloc_all_io_state { 152 struct ore_io_state ios; 153 struct ore_per_dev_state per_dev[numdevs]; 154 union { 155 struct osd_sg_entry sglist[sgs_per_dev * numdevs]; 156 struct page *pages[num_par_pages]; 157 }; 158 } *_aios; 159 160 if (likely(sizeof(*_aios) <= PAGE_SIZE)) { 161 _aios = kzalloc(sizeof(*_aios), GFP_KERNEL); 162 if (unlikely(!_aios)) { 163 ORE_DBGMSG("Failed kzalloc bytes=%zd\n", 164 sizeof(*_aios)); 165 *pios = NULL; 166 return -ENOMEM; 167 } 168 pages = num_par_pages ? _aios->pages : NULL; 169 sgilist = sgs_per_dev ? _aios->sglist : NULL; 170 ios = &_aios->ios; 171 } else { 172 struct __alloc_small_io_state { 173 struct ore_io_state ios; 174 struct ore_per_dev_state per_dev[numdevs]; 175 } *_aio_small; 176 union __extra_part { 177 struct osd_sg_entry sglist[sgs_per_dev * numdevs]; 178 struct page *pages[num_par_pages]; 179 } *extra_part; 180 181 _aio_small = kzalloc(sizeof(*_aio_small), GFP_KERNEL); 182 if (unlikely(!_aio_small)) { 183 ORE_DBGMSG("Failed alloc first part bytes=%zd\n", 184 sizeof(*_aio_small)); 185 *pios = NULL; 186 return -ENOMEM; 187 } 188 extra_part = kzalloc(sizeof(*extra_part), GFP_KERNEL); 189 if (unlikely(!extra_part)) { 190 ORE_DBGMSG("Failed alloc second part bytes=%zd\n", 191 sizeof(*extra_part)); 192 kfree(_aio_small); 193 *pios = NULL; 194 return -ENOMEM; 195 } 196 197 pages = num_par_pages ? extra_part->pages : NULL; 198 sgilist = sgs_per_dev ? extra_part->sglist : NULL; 199 /* In this case the per_dev[0].sgilist holds the pointer to 200 * be freed 201 */ 202 ios = &_aio_small->ios; 203 ios->extra_part_alloc = true; 204 } 205 206 if (pages) { 207 ios->parity_pages = pages; 208 ios->max_par_pages = num_par_pages; 209 } 210 if (sgilist) { 211 unsigned d; 212 213 for (d = 0; d < numdevs; ++d) { 214 ios->per_dev[d].sglist = sgilist; 215 sgilist += sgs_per_dev; 216 } 217 ios->sgs_per_dev = sgs_per_dev; 218 } 219 220 ios->layout = layout; 221 ios->oc = oc; 222 *pios = ios; 223 return 0; 224} 225 226/* Allocate an io_state for only a single group of devices 227 * 228 * If a user needs to call ore_read/write() this version must be used becase it 229 * allocates extra stuff for striping and raid. 230 * The ore might decide to only IO less then @length bytes do to alignmets 231 * and constrains as follows: 232 * - The IO cannot cross group boundary. 233 * - In raid5/6 The end of the IO must align at end of a stripe eg. 234 * (@offset + @length) % strip_size == 0. Or the complete range is within a 235 * single stripe. 236 * - Memory condition only permitted a shorter IO. (A user can use @length=~0 237 * And check the returned ios->length for max_io_size.) 238 * 239 * The caller must check returned ios->length (and/or ios->nr_pages) and 240 * re-issue these pages that fall outside of ios->length 241 */ 242int ore_get_rw_state(struct ore_layout *layout, struct ore_components *oc, 243 bool is_reading, u64 offset, u64 length, 244 struct ore_io_state **pios) 245{ 246 struct ore_io_state *ios; 247 unsigned numdevs = layout->group_width * layout->mirrors_p1; 248 unsigned sgs_per_dev = 0, max_par_pages = 0; 249 int ret; 250 251 if (layout->parity && length) { 252 unsigned data_devs = layout->group_width - layout->parity; 253 unsigned stripe_size = layout->stripe_unit * data_devs; 254 unsigned pages_in_unit = layout->stripe_unit / PAGE_SIZE; 255 u32 remainder; 256 u64 num_stripes; 257 u64 num_raid_units; 258 259 num_stripes = div_u64_rem(length, stripe_size, &remainder); 260 if (remainder) 261 ++num_stripes; 262 263 num_raid_units = num_stripes * layout->parity; 264 265 if (is_reading) { 266 /* For reads add per_dev sglist array */ 267 /* TODO: Raid 6 we need twice more. Actually: 268 * num_stripes / LCMdP(W,P); 269 * if (W%P != 0) num_stripes *= parity; 270 */ 271 272 /* first/last seg is split */ 273 num_raid_units += layout->group_width; 274 sgs_per_dev = div_u64(num_raid_units, data_devs) + 2; 275 } else { 276 /* For Writes add parity pages array. */ 277 max_par_pages = num_raid_units * pages_in_unit * 278 sizeof(struct page *); 279 } 280 } 281 282 ret = _ore_get_io_state(layout, oc, numdevs, sgs_per_dev, max_par_pages, 283 pios); 284 if (unlikely(ret)) 285 return ret; 286 287 ios = *pios; 288 ios->reading = is_reading; 289 ios->offset = offset; 290 291 if (length) { 292 ore_calc_stripe_info(layout, offset, length, &ios->si); 293 ios->length = ios->si.length; 294 ios->nr_pages = ((ios->offset & (PAGE_SIZE - 1)) + 295 ios->length + PAGE_SIZE - 1) / PAGE_SIZE; 296 if (layout->parity) 297 _ore_post_alloc_raid_stuff(ios); 298 } 299 300 return 0; 301} 302EXPORT_SYMBOL(ore_get_rw_state); 303 304/* Allocate an io_state for all the devices in the comps array 305 * 306 * This version of io_state allocation is used mostly by create/remove 307 * and trunc where we currently need all the devices. The only wastful 308 * bit is the read/write_attributes with no IO. Those sites should 309 * be converted to use ore_get_rw_state() with length=0 310 */ 311int ore_get_io_state(struct ore_layout *layout, struct ore_components *oc, 312 struct ore_io_state **pios) 313{ 314 return _ore_get_io_state(layout, oc, oc->numdevs, 0, 0, pios); 315} 316EXPORT_SYMBOL(ore_get_io_state); 317 318void ore_put_io_state(struct ore_io_state *ios) 319{ 320 if (ios) { 321 unsigned i; 322 323 for (i = 0; i < ios->numdevs; i++) { 324 struct ore_per_dev_state *per_dev = &ios->per_dev[i]; 325 326 if (per_dev->or) 327 osd_end_request(per_dev->or); 328 if (per_dev->bio) 329 bio_put(per_dev->bio); 330 } 331 332 _ore_free_raid_stuff(ios); 333 kfree(ios); 334 } 335} 336EXPORT_SYMBOL(ore_put_io_state); 337 338static void _sync_done(struct ore_io_state *ios, void *p) 339{ 340 struct completion *waiting = p; 341 342 complete(waiting); 343} 344 345static void _last_io(struct kref *kref) 346{ 347 struct ore_io_state *ios = container_of( 348 kref, struct ore_io_state, kref); 349 350 ios->done(ios, ios->private); 351} 352 353static void _done_io(struct osd_request *or, void *p) 354{ 355 struct ore_io_state *ios = p; 356 357 kref_put(&ios->kref, _last_io); 358} 359 360int ore_io_execute(struct ore_io_state *ios) 361{ 362 DECLARE_COMPLETION_ONSTACK(wait); 363 bool sync = (ios->done == NULL); 364 int i, ret; 365 366 if (sync) { 367 ios->done = _sync_done; 368 ios->private = &wait; 369 } 370 371 for (i = 0; i < ios->numdevs; i++) { 372 struct osd_request *or = ios->per_dev[i].or; 373 if (unlikely(!or)) 374 continue; 375 376 ret = osd_finalize_request(or, 0, _ios_cred(ios, i), NULL); 377 if (unlikely(ret)) { 378 ORE_DBGMSG("Failed to osd_finalize_request() => %d\n", 379 ret); 380 return ret; 381 } 382 } 383 384 kref_init(&ios->kref); 385 386 for (i = 0; i < ios->numdevs; i++) { 387 struct osd_request *or = ios->per_dev[i].or; 388 if (unlikely(!or)) 389 continue; 390 391 kref_get(&ios->kref); 392 osd_execute_request_async(or, _done_io, ios); 393 } 394 395 kref_put(&ios->kref, _last_io); 396 ret = 0; 397 398 if (sync) { 399 wait_for_completion(&wait); 400 ret = ore_check_io(ios, NULL); 401 } 402 return ret; 403} 404 405static void _clear_bio(struct bio *bio) 406{ 407 struct bio_vec *bv; 408 unsigned i; 409 410 bio_for_each_segment_all(bv, bio, i) { 411 unsigned this_count = bv->bv_len; 412 413 if (likely(PAGE_SIZE == this_count)) 414 clear_highpage(bv->bv_page); 415 else 416 zero_user(bv->bv_page, bv->bv_offset, this_count); 417 } 418} 419 420int ore_check_io(struct ore_io_state *ios, ore_on_dev_error on_dev_error) 421{ 422 enum osd_err_priority acumulated_osd_err = 0; 423 int acumulated_lin_err = 0; 424 int i; 425 426 for (i = 0; i < ios->numdevs; i++) { 427 struct osd_sense_info osi; 428 struct ore_per_dev_state *per_dev = &ios->per_dev[i]; 429 struct osd_request *or = per_dev->or; 430 int ret; 431 432 if (unlikely(!or)) 433 continue; 434 435 ret = osd_req_decode_sense(or, &osi); 436 if (likely(!ret)) 437 continue; 438 439 if ((OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) && 440 per_dev->bio) { 441 /* start read offset passed endof file. 442 * Note: if we do not have bio it means read-attributes 443 * In this case we should return error to caller. 444 */ 445 _clear_bio(per_dev->bio); 446 ORE_DBGMSG("start read offset passed end of file " 447 "offset=0x%llx, length=0x%llx\n", 448 _LLU(per_dev->offset), 449 _LLU(per_dev->length)); 450 451 continue; /* we recovered */ 452 } 453 454 if (on_dev_error) { 455 u64 residual = ios->reading ? 456 or->in.residual : or->out.residual; 457 u64 offset = (ios->offset + ios->length) - residual; 458 unsigned dev = per_dev->dev - ios->oc->first_dev; 459 struct ore_dev *od = ios->oc->ods[dev]; 460 461 on_dev_error(ios, od, dev, osi.osd_err_pri, 462 offset, residual); 463 } 464 if (osi.osd_err_pri >= acumulated_osd_err) { 465 acumulated_osd_err = osi.osd_err_pri; 466 acumulated_lin_err = ret; 467 } 468 } 469 470 return acumulated_lin_err; 471} 472EXPORT_SYMBOL(ore_check_io); 473 474/* 475 * L - logical offset into the file 476 * 477 * D - number of Data devices 478 * D = group_width - parity 479 * 480 * U - The number of bytes in a stripe within a group 481 * U = stripe_unit * D 482 * 483 * T - The number of bytes striped within a group of component objects 484 * (before advancing to the next group) 485 * T = U * group_depth 486 * 487 * S - The number of bytes striped across all component objects 488 * before the pattern repeats 489 * S = T * group_count 490 * 491 * M - The "major" (i.e., across all components) cycle number 492 * M = L / S 493 * 494 * G - Counts the groups from the beginning of the major cycle 495 * G = (L - (M * S)) / T [or (L % S) / T] 496 * 497 * H - The byte offset within the group 498 * H = (L - (M * S)) % T [or (L % S) % T] 499 * 500 * N - The "minor" (i.e., across the group) stripe number 501 * N = H / U 502 * 503 * C - The component index coresponding to L 504 * 505 * C = (H - (N * U)) / stripe_unit + G * D 506 * [or (L % U) / stripe_unit + G * D] 507 * 508 * O - The component offset coresponding to L 509 * O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit 510 * 511 * LCMdP – Parity cycle: Lowest Common Multiple of group_width, parity 512 * divide by parity 513 * LCMdP = lcm(group_width, parity) / parity 514 * 515 * R - The parity Rotation stripe 516 * (Note parity cycle always starts at a group's boundary) 517 * R = N % LCMdP 518 * 519 * I = the first parity device index 520 * I = (group_width + group_width - R*parity - parity) % group_width 521 * 522 * Craid - The component index Rotated 523 * Craid = (group_width + C - R*parity) % group_width 524 * (We add the group_width to avoid negative numbers modulo math) 525 */ 526void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset, 527 u64 length, struct ore_striping_info *si) 528{ 529 u32 stripe_unit = layout->stripe_unit; 530 u32 group_width = layout->group_width; 531 u64 group_depth = layout->group_depth; 532 u32 parity = layout->parity; 533 534 u32 D = group_width - parity; 535 u32 U = D * stripe_unit; 536 u64 T = U * group_depth; 537 u64 S = T * layout->group_count; 538 u64 M = div64_u64(file_offset, S); 539 540 /* 541 G = (L - (M * S)) / T 542 H = (L - (M * S)) % T 543 */ 544 u64 LmodS = file_offset - M * S; 545 u32 G = div64_u64(LmodS, T); 546 u64 H = LmodS - G * T; 547 548 u32 N = div_u64(H, U); 549 u32 Nlast; 550 551 /* "H - (N * U)" is just "H % U" so it's bound to u32 */ 552 u32 C = (u32)(H - (N * U)) / stripe_unit + G * group_width; 553 u32 first_dev = C - C % group_width; 554 555 div_u64_rem(file_offset, stripe_unit, &si->unit_off); 556 557 si->obj_offset = si->unit_off + (N * stripe_unit) + 558 (M * group_depth * stripe_unit); 559 si->cur_comp = C - first_dev; 560 si->cur_pg = si->unit_off / PAGE_SIZE; 561 562 if (parity) { 563 u32 LCMdP = lcm(group_width, parity) / parity; 564 /* R = N % LCMdP; */ 565 u32 RxP = (N % LCMdP) * parity; 566 567 si->par_dev = (group_width + group_width - parity - RxP) % 568 group_width + first_dev; 569 si->dev = (group_width + group_width + C - RxP) % 570 group_width + first_dev; 571 si->bytes_in_stripe = U; 572 si->first_stripe_start = M * S + G * T + N * U; 573 } else { 574 /* Make the math correct see _prepare_one_group */ 575 si->par_dev = group_width; 576 si->dev = C; 577 } 578 579 si->dev *= layout->mirrors_p1; 580 si->par_dev *= layout->mirrors_p1; 581 si->offset = file_offset; 582 si->length = T - H; 583 if (si->length > length) 584 si->length = length; 585 586 Nlast = div_u64(H + si->length + U - 1, U); 587 si->maxdevUnits = Nlast - N; 588 589 si->M = M; 590} 591EXPORT_SYMBOL(ore_calc_stripe_info); 592 593int _ore_add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg, 594 unsigned pgbase, struct page **pages, 595 struct ore_per_dev_state *per_dev, int cur_len) 596{ 597 unsigned pg = *cur_pg; 598 struct request_queue *q = 599 osd_request_queue(_ios_od(ios, per_dev->dev)); 600 unsigned len = cur_len; 601 int ret; 602 603 if (per_dev->bio == NULL) { 604 unsigned bio_size; 605 606 if (!ios->reading) { 607 bio_size = ios->si.maxdevUnits; 608 } else { 609 bio_size = (ios->si.maxdevUnits + 1) * 610 (ios->layout->group_width - ios->layout->parity) / 611 ios->layout->group_width; 612 } 613 bio_size *= (ios->layout->stripe_unit / PAGE_SIZE); 614 615 per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size); 616 if (unlikely(!per_dev->bio)) { 617 ORE_DBGMSG("Failed to allocate BIO size=%u\n", 618 bio_size); 619 ret = -ENOMEM; 620 goto out; 621 } 622 } 623 624 while (cur_len > 0) { 625 unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len); 626 unsigned added_len; 627 628 cur_len -= pglen; 629 630 added_len = bio_add_pc_page(q, per_dev->bio, pages[pg], 631 pglen, pgbase); 632 if (unlikely(pglen != added_len)) { 633 /* If bi_vcnt == bi_max then this is a SW BUG */ 634 ORE_DBGMSG("Failed bio_add_pc_page bi_vcnt=0x%x " 635 "bi_max=0x%x BIO_MAX=0x%x cur_len=0x%x\n", 636 per_dev->bio->bi_vcnt, 637 per_dev->bio->bi_max_vecs, 638 BIO_MAX_PAGES_KMALLOC, cur_len); 639 ret = -ENOMEM; 640 goto out; 641 } 642 _add_stripe_page(ios->sp2d, &ios->si, pages[pg]); 643 644 pgbase = 0; 645 ++pg; 646 } 647 BUG_ON(cur_len); 648 649 per_dev->length += len; 650 *cur_pg = pg; 651 ret = 0; 652out: /* we fail the complete unit on an error eg don't advance 653 * per_dev->length and cur_pg. This means that we might have a bigger 654 * bio than the CDB requested length (per_dev->length). That's fine 655 * only the oposite is fatal. 656 */ 657 return ret; 658} 659 660static int _add_parity_units(struct ore_io_state *ios, 661 struct ore_striping_info *si, 662 unsigned dev, unsigned first_dev, 663 unsigned mirrors_p1, unsigned devs_in_group, 664 unsigned cur_len) 665{ 666 unsigned do_parity; 667 int ret = 0; 668 669 for (do_parity = ios->layout->parity; do_parity; --do_parity) { 670 struct ore_per_dev_state *per_dev; 671 672 per_dev = &ios->per_dev[dev - first_dev]; 673 if (!per_dev->length && !per_dev->offset) { 674 /* Only/always the parity unit of the first 675 * stripe will be empty. So this is a chance to 676 * initialize the per_dev info. 677 */ 678 per_dev->dev = dev; 679 per_dev->offset = si->obj_offset - si->unit_off; 680 } 681 682 ret = _ore_add_parity_unit(ios, si, per_dev, cur_len, 683 do_parity == 1); 684 if (unlikely(ret)) 685 break; 686 687 if (do_parity != 1) { 688 dev = ((dev + mirrors_p1) % devs_in_group) + first_dev; 689 si->cur_comp = (si->cur_comp + 1) % 690 ios->layout->group_width; 691 } 692 } 693 694 return ret; 695} 696 697static int _prepare_for_striping(struct ore_io_state *ios) 698{ 699 struct ore_striping_info *si = &ios->si; 700 unsigned stripe_unit = ios->layout->stripe_unit; 701 unsigned mirrors_p1 = ios->layout->mirrors_p1; 702 unsigned group_width = ios->layout->group_width; 703 unsigned devs_in_group = group_width * mirrors_p1; 704 unsigned dev = si->dev; 705 unsigned first_dev = dev - (dev % devs_in_group); 706 unsigned cur_pg = ios->pages_consumed; 707 u64 length = ios->length; 708 int ret = 0; 709 710 if (!ios->pages) { 711 ios->numdevs = ios->layout->mirrors_p1; 712 return 0; 713 } 714 715 BUG_ON(length > si->length); 716 717 while (length) { 718 struct ore_per_dev_state *per_dev = 719 &ios->per_dev[dev - first_dev]; 720 unsigned cur_len, page_off = 0; 721 722 if (!per_dev->length && !per_dev->offset) { 723 /* First time initialize the per_dev info. */ 724 per_dev->dev = dev; 725 if (dev == si->dev) { 726 WARN_ON(dev == si->par_dev); 727 per_dev->offset = si->obj_offset; 728 cur_len = stripe_unit - si->unit_off; 729 page_off = si->unit_off & ~PAGE_MASK; 730 BUG_ON(page_off && (page_off != ios->pgbase)); 731 } else { 732 per_dev->offset = si->obj_offset - si->unit_off; 733 cur_len = stripe_unit; 734 } 735 } else { 736 cur_len = stripe_unit; 737 } 738 if (cur_len >= length) 739 cur_len = length; 740 741 ret = _ore_add_stripe_unit(ios, &cur_pg, page_off, ios->pages, 742 per_dev, cur_len); 743 if (unlikely(ret)) 744 goto out; 745 746 length -= cur_len; 747 748 dev = ((dev + mirrors_p1) % devs_in_group) + first_dev; 749 si->cur_comp = (si->cur_comp + 1) % group_width; 750 if (unlikely((dev == si->par_dev) || (!length && ios->sp2d))) { 751 if (!length && ios->sp2d) { 752 /* If we are writing and this is the very last 753 * stripe. then operate on parity dev. 754 */ 755 dev = si->par_dev; 756 /* If last stripe operate on parity comp */ 757 si->cur_comp = group_width - ios->layout->parity; 758 } 759 760 /* In writes cur_len just means if it's the 761 * last one. See _ore_add_parity_unit. 762 */ 763 ret = _add_parity_units(ios, si, dev, first_dev, 764 mirrors_p1, devs_in_group, 765 ios->sp2d ? length : cur_len); 766 if (unlikely(ret)) 767 goto out; 768 769 /* Rotate next par_dev backwards with wraping */ 770 si->par_dev = (devs_in_group + si->par_dev - 771 ios->layout->parity * mirrors_p1) % 772 devs_in_group + first_dev; 773 /* Next stripe, start fresh */ 774 si->cur_comp = 0; 775 si->cur_pg = 0; 776 si->obj_offset += cur_len; 777 si->unit_off = 0; 778 } 779 } 780out: 781 ios->numdevs = devs_in_group; 782 ios->pages_consumed = cur_pg; 783 return ret; 784} 785 786int ore_create(struct ore_io_state *ios) 787{ 788 int i, ret; 789 790 for (i = 0; i < ios->oc->numdevs; i++) { 791 struct osd_request *or; 792 793 or = osd_start_request(_ios_od(ios, i), GFP_KERNEL); 794 if (unlikely(!or)) { 795 ORE_ERR("%s: osd_start_request failed\n", __func__); 796 ret = -ENOMEM; 797 goto out; 798 } 799 ios->per_dev[i].or = or; 800 ios->numdevs++; 801 802 osd_req_create_object(or, _ios_obj(ios, i)); 803 } 804 ret = ore_io_execute(ios); 805 806out: 807 return ret; 808} 809EXPORT_SYMBOL(ore_create); 810 811int ore_remove(struct ore_io_state *ios) 812{ 813 int i, ret; 814 815 for (i = 0; i < ios->oc->numdevs; i++) { 816 struct osd_request *or; 817 818 or = osd_start_request(_ios_od(ios, i), GFP_KERNEL); 819 if (unlikely(!or)) { 820 ORE_ERR("%s: osd_start_request failed\n", __func__); 821 ret = -ENOMEM; 822 goto out; 823 } 824 ios->per_dev[i].or = or; 825 ios->numdevs++; 826 827 osd_req_remove_object(or, _ios_obj(ios, i)); 828 } 829 ret = ore_io_execute(ios); 830 831out: 832 return ret; 833} 834EXPORT_SYMBOL(ore_remove); 835 836static int _write_mirror(struct ore_io_state *ios, int cur_comp) 837{ 838 struct ore_per_dev_state *master_dev = &ios->per_dev[cur_comp]; 839 unsigned dev = ios->per_dev[cur_comp].dev; 840 unsigned last_comp = cur_comp + ios->layout->mirrors_p1; 841 int ret = 0; 842 843 if (ios->pages && !master_dev->length) 844 return 0; /* Just an empty slot */ 845 846 for (; cur_comp < last_comp; ++cur_comp, ++dev) { 847 struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; 848 struct osd_request *or; 849 850 or = osd_start_request(_ios_od(ios, dev), GFP_KERNEL); 851 if (unlikely(!or)) { 852 ORE_ERR("%s: osd_start_request failed\n", __func__); 853 ret = -ENOMEM; 854 goto out; 855 } 856 per_dev->or = or; 857 858 if (ios->pages) { 859 struct bio *bio; 860 861 if (per_dev != master_dev) { 862 bio = bio_clone_kmalloc(master_dev->bio, 863 GFP_KERNEL); 864 if (unlikely(!bio)) { 865 ORE_DBGMSG( 866 "Failed to allocate BIO size=%u\n", 867 master_dev->bio->bi_max_vecs); 868 ret = -ENOMEM; 869 goto out; 870 } 871 872 bio->bi_bdev = NULL; 873 bio->bi_next = NULL; 874 per_dev->offset = master_dev->offset; 875 per_dev->length = master_dev->length; 876 per_dev->bio = bio; 877 per_dev->dev = dev; 878 } else { 879 bio = master_dev->bio; 880 /* FIXME: bio_set_dir() */ 881 bio->bi_rw |= REQ_WRITE; 882 } 883 884 osd_req_write(or, _ios_obj(ios, cur_comp), 885 per_dev->offset, bio, per_dev->length); 886 ORE_DBGMSG("write(0x%llx) offset=0x%llx " 887 "length=0x%llx dev=%d\n", 888 _LLU(_ios_obj(ios, cur_comp)->id), 889 _LLU(per_dev->offset), 890 _LLU(per_dev->length), dev); 891 } else if (ios->kern_buff) { 892 per_dev->offset = ios->si.obj_offset; 893 per_dev->dev = ios->si.dev + dev; 894 895 /* no cross device without page array */ 896 BUG_ON((ios->layout->group_width > 1) && 897 (ios->si.unit_off + ios->length > 898 ios->layout->stripe_unit)); 899 900 ret = osd_req_write_kern(or, _ios_obj(ios, cur_comp), 901 per_dev->offset, 902 ios->kern_buff, ios->length); 903 if (unlikely(ret)) 904 goto out; 905 ORE_DBGMSG2("write_kern(0x%llx) offset=0x%llx " 906 "length=0x%llx dev=%d\n", 907 _LLU(_ios_obj(ios, cur_comp)->id), 908 _LLU(per_dev->offset), 909 _LLU(ios->length), per_dev->dev); 910 } else { 911 osd_req_set_attributes(or, _ios_obj(ios, cur_comp)); 912 ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n", 913 _LLU(_ios_obj(ios, cur_comp)->id), 914 ios->out_attr_len, dev); 915 } 916 917 if (ios->out_attr) 918 osd_req_add_set_attr_list(or, ios->out_attr, 919 ios->out_attr_len); 920 921 if (ios->in_attr) 922 osd_req_add_get_attr_list(or, ios->in_attr, 923 ios->in_attr_len); 924 } 925 926out: 927 return ret; 928} 929 930int ore_write(struct ore_io_state *ios) 931{ 932 int i; 933 int ret; 934 935 if (unlikely(ios->sp2d && !ios->r4w)) { 936 /* A library is attempting a RAID-write without providing 937 * a pages lock interface. 938 */ 939 WARN_ON_ONCE(1); 940 return -ENOTSUPP; 941 } 942 943 ret = _prepare_for_striping(ios); 944 if (unlikely(ret)) 945 return ret; 946 947 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { 948 ret = _write_mirror(ios, i); 949 if (unlikely(ret)) 950 return ret; 951 } 952 953 ret = ore_io_execute(ios); 954 return ret; 955} 956EXPORT_SYMBOL(ore_write); 957 958int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp) 959{ 960 struct osd_request *or; 961 struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; 962 struct osd_obj_id *obj = _ios_obj(ios, cur_comp); 963 unsigned first_dev = (unsigned)obj->id; 964 965 if (ios->pages && !per_dev->length) 966 return 0; /* Just an empty slot */ 967 968 first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1; 969 or = osd_start_request(_ios_od(ios, first_dev), GFP_KERNEL); 970 if (unlikely(!or)) { 971 ORE_ERR("%s: osd_start_request failed\n", __func__); 972 return -ENOMEM; 973 } 974 per_dev->or = or; 975 976 if (ios->pages) { 977 if (per_dev->cur_sg) { 978 /* finalize the last sg_entry */ 979 _ore_add_sg_seg(per_dev, 0, false); 980 if (unlikely(!per_dev->cur_sg)) 981 return 0; /* Skip parity only device */ 982 983 osd_req_read_sg(or, obj, per_dev->bio, 984 per_dev->sglist, per_dev->cur_sg); 985 } else { 986 /* The no raid case */ 987 osd_req_read(or, obj, per_dev->offset, 988 per_dev->bio, per_dev->length); 989 } 990 991 ORE_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx" 992 " dev=%d sg_len=%d\n", _LLU(obj->id), 993 _LLU(per_dev->offset), _LLU(per_dev->length), 994 first_dev, per_dev->cur_sg); 995 } else { 996 BUG_ON(ios->kern_buff); 997 998 osd_req_get_attributes(or, obj); 999 ORE_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n", 1000 _LLU(obj->id), 1001 ios->in_attr_len, first_dev); 1002 } 1003 if (ios->out_attr) 1004 osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len); 1005 1006 if (ios->in_attr) 1007 osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len); 1008 1009 return 0; 1010} 1011 1012int ore_read(struct ore_io_state *ios) 1013{ 1014 int i; 1015 int ret; 1016 1017 ret = _prepare_for_striping(ios); 1018 if (unlikely(ret)) 1019 return ret; 1020 1021 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { 1022 ret = _ore_read_mirror(ios, i); 1023 if (unlikely(ret)) 1024 return ret; 1025 } 1026 1027 ret = ore_io_execute(ios); 1028 return ret; 1029} 1030EXPORT_SYMBOL(ore_read); 1031 1032int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr) 1033{ 1034 struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */ 1035 void *iter = NULL; 1036 int nelem; 1037 1038 do { 1039 nelem = 1; 1040 osd_req_decode_get_attr_list(ios->per_dev[0].or, 1041 &cur_attr, &nelem, &iter); 1042 if ((cur_attr.attr_page == attr->attr_page) && 1043 (cur_attr.attr_id == attr->attr_id)) { 1044 attr->len = cur_attr.len; 1045 attr->val_ptr = cur_attr.val_ptr; 1046 return 0; 1047 } 1048 } while (iter); 1049 1050 return -EIO; 1051} 1052EXPORT_SYMBOL(extract_attr_from_ios); 1053 1054static int _truncate_mirrors(struct ore_io_state *ios, unsigned cur_comp, 1055 struct osd_attr *attr) 1056{ 1057 int last_comp = cur_comp + ios->layout->mirrors_p1; 1058 1059 for (; cur_comp < last_comp; ++cur_comp) { 1060 struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; 1061 struct osd_request *or; 1062 1063 or = osd_start_request(_ios_od(ios, cur_comp), GFP_KERNEL); 1064 if (unlikely(!or)) { 1065 ORE_ERR("%s: osd_start_request failed\n", __func__); 1066 return -ENOMEM; 1067 } 1068 per_dev->or = or; 1069 1070 osd_req_set_attributes(or, _ios_obj(ios, cur_comp)); 1071 osd_req_add_set_attr_list(or, attr, 1); 1072 } 1073 1074 return 0; 1075} 1076 1077struct _trunc_info { 1078 struct ore_striping_info si; 1079 u64 prev_group_obj_off; 1080 u64 next_group_obj_off; 1081 1082 unsigned first_group_dev; 1083 unsigned nex_group_dev; 1084}; 1085 1086static void _calc_trunk_info(struct ore_layout *layout, u64 file_offset, 1087 struct _trunc_info *ti) 1088{ 1089 unsigned stripe_unit = layout->stripe_unit; 1090 1091 ore_calc_stripe_info(layout, file_offset, 0, &ti->si); 1092 1093 ti->prev_group_obj_off = ti->si.M * stripe_unit; 1094 ti->next_group_obj_off = ti->si.M ? (ti->si.M - 1) * stripe_unit : 0; 1095 1096 ti->first_group_dev = ti->si.dev - (ti->si.dev % layout->group_width); 1097 ti->nex_group_dev = ti->first_group_dev + layout->group_width; 1098} 1099 1100int ore_truncate(struct ore_layout *layout, struct ore_components *oc, 1101 u64 size) 1102{ 1103 struct ore_io_state *ios; 1104 struct exofs_trunc_attr { 1105 struct osd_attr attr; 1106 __be64 newsize; 1107 } *size_attrs; 1108 struct _trunc_info ti; 1109 int i, ret; 1110 1111 ret = ore_get_io_state(layout, oc, &ios); 1112 if (unlikely(ret)) 1113 return ret; 1114 1115 _calc_trunk_info(ios->layout, size, &ti); 1116 1117 size_attrs = kcalloc(ios->oc->numdevs, sizeof(*size_attrs), 1118 GFP_KERNEL); 1119 if (unlikely(!size_attrs)) { 1120 ret = -ENOMEM; 1121 goto out; 1122 } 1123 1124 ios->numdevs = ios->oc->numdevs; 1125 1126 for (i = 0; i < ios->numdevs; ++i) { 1127 struct exofs_trunc_attr *size_attr = &size_attrs[i]; 1128 u64 obj_size; 1129 1130 if (i < ti.first_group_dev) 1131 obj_size = ti.prev_group_obj_off; 1132 else if (i >= ti.nex_group_dev) 1133 obj_size = ti.next_group_obj_off; 1134 else if (i < ti.si.dev) /* dev within this group */ 1135 obj_size = ti.si.obj_offset + 1136 ios->layout->stripe_unit - ti.si.unit_off; 1137 else if (i == ti.si.dev) 1138 obj_size = ti.si.obj_offset; 1139 else /* i > ti.dev */ 1140 obj_size = ti.si.obj_offset - ti.si.unit_off; 1141 1142 size_attr->newsize = cpu_to_be64(obj_size); 1143 size_attr->attr = g_attr_logical_length; 1144 size_attr->attr.val_ptr = &size_attr->newsize; 1145 1146 ORE_DBGMSG2("trunc(0x%llx) obj_offset=0x%llx dev=%d\n", 1147 _LLU(oc->comps->obj.id), _LLU(obj_size), i); 1148 ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1, 1149 &size_attr->attr); 1150 if (unlikely(ret)) 1151 goto out; 1152 } 1153 ret = ore_io_execute(ios); 1154 1155out: 1156 kfree(size_attrs); 1157 ore_put_io_state(ios); 1158 return ret; 1159} 1160EXPORT_SYMBOL(ore_truncate); 1161 1162const struct osd_attr g_attr_logical_length = ATTR_DEF( 1163 OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); 1164EXPORT_SYMBOL(g_attr_logical_length); 1165