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TOMOYO Linux Cross Reference
Linux/fs/exofs/ore.c

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

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