Commit | Line | Data |
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b14f8ab2 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
b14f8ab2 BH |
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 | ||
5a0e3ad6 | 25 | #include <linux/slab.h> |
5d952b83 | 26 | #include <asm/div64.h> |
a1fec1db | 27 | #include <linux/lcm.h> |
b14f8ab2 | 28 | |
a1fec1db | 29 | #include "ore_raid.h" |
8ff660ab | 30 | |
cf283ade BH |
31 | MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>"); |
32 | MODULE_DESCRIPTION("Objects Raid Engine ore.ko"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
5a51c0c7 BH |
35 | /* ore_verify_layout does a couple of things: |
36 | * 1. Given a minimum number of needed parameters fixes up the rest of the | |
37 | * members to be operatonals for the ore. The needed parameters are those | |
38 | * that are defined by the pnfs-objects layout STD. | |
39 | * 2. Check to see if the current ore code actually supports these parameters | |
40 | * for example stripe_unit must be a multple of the system PAGE_SIZE, | |
41 | * and etc... | |
42 | * 3. Cache some havily used calculations that will be needed by users. | |
43 | */ | |
44 | ||
5a51c0c7 BH |
45 | enum { BIO_MAX_PAGES_KMALLOC = |
46 | (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),}; | |
47 | ||
48 | int ore_verify_layout(unsigned total_comps, struct ore_layout *layout) | |
49 | { | |
50 | u64 stripe_length; | |
51 | ||
44231e68 BH |
52 | switch (layout->raid_algorithm) { |
53 | case PNFS_OSD_RAID_0: | |
54 | layout->parity = 0; | |
55 | break; | |
56 | case PNFS_OSD_RAID_5: | |
57 | layout->parity = 1; | |
58 | break; | |
59 | case PNFS_OSD_RAID_PQ: | |
60 | case PNFS_OSD_RAID_4: | |
61 | default: | |
62 | ORE_ERR("Only RAID_0/5 for now\n"); | |
5a51c0c7 BH |
63 | return -EINVAL; |
64 | } | |
65 | if (0 != (layout->stripe_unit & ~PAGE_MASK)) { | |
66 | ORE_ERR("Stripe Unit(0x%llx)" | |
67 | " must be Multples of PAGE_SIZE(0x%lx)\n", | |
68 | _LLU(layout->stripe_unit), PAGE_SIZE); | |
69 | return -EINVAL; | |
70 | } | |
71 | if (layout->group_width) { | |
72 | if (!layout->group_depth) { | |
73 | ORE_ERR("group_depth == 0 && group_width != 0\n"); | |
74 | return -EINVAL; | |
75 | } | |
76 | if (total_comps < (layout->group_width * layout->mirrors_p1)) { | |
77 | ORE_ERR("Data Map wrong, " | |
78 | "numdevs=%d < group_width=%d * mirrors=%d\n", | |
79 | total_comps, layout->group_width, | |
80 | layout->mirrors_p1); | |
81 | return -EINVAL; | |
82 | } | |
83 | layout->group_count = total_comps / layout->mirrors_p1 / | |
84 | layout->group_width; | |
85 | } else { | |
86 | if (layout->group_depth) { | |
87 | printk(KERN_NOTICE "Warning: group_depth ignored " | |
88 | "group_width == 0 && group_depth == %lld\n", | |
89 | _LLU(layout->group_depth)); | |
90 | } | |
91 | layout->group_width = total_comps / layout->mirrors_p1; | |
92 | layout->group_depth = -1; | |
93 | layout->group_count = 1; | |
94 | } | |
95 | ||
96 | stripe_length = (u64)layout->group_width * layout->stripe_unit; | |
97 | if (stripe_length >= (1ULL << 32)) { | |
98 | ORE_ERR("Stripe_length(0x%llx) >= 32bit is not supported\n", | |
99 | _LLU(stripe_length)); | |
100 | return -EINVAL; | |
101 | } | |
102 | ||
103 | layout->max_io_length = | |
104 | (BIO_MAX_PAGES_KMALLOC * PAGE_SIZE - layout->stripe_unit) * | |
105 | layout->group_width; | |
769ba8d9 BH |
106 | if (layout->parity) { |
107 | unsigned stripe_length = | |
108 | (layout->group_width - layout->parity) * | |
109 | layout->stripe_unit; | |
110 | ||
111 | layout->max_io_length /= stripe_length; | |
112 | layout->max_io_length *= stripe_length; | |
113 | } | |
5a51c0c7 BH |
114 | return 0; |
115 | } | |
116 | EXPORT_SYMBOL(ore_verify_layout); | |
117 | ||
8ff660ab | 118 | static u8 *_ios_cred(struct ore_io_state *ios, unsigned index) |
9e9db456 | 119 | { |
5bf696da | 120 | return ios->oc->comps[index & ios->oc->single_comp].cred; |
9e9db456 BH |
121 | } |
122 | ||
8ff660ab | 123 | static struct osd_obj_id *_ios_obj(struct ore_io_state *ios, unsigned index) |
9e9db456 | 124 | { |
5bf696da | 125 | return &ios->oc->comps[index & ios->oc->single_comp].obj; |
9e9db456 BH |
126 | } |
127 | ||
8ff660ab | 128 | static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index) |
9e9db456 | 129 | { |
3bd98568 BH |
130 | ORE_DBGMSG2("oc->first_dev=%d oc->numdevs=%d i=%d oc->ods=%p\n", |
131 | ios->oc->first_dev, ios->oc->numdevs, index, | |
132 | ios->oc->ods); | |
133 | ||
d866d875 | 134 | return ore_comp_dev(ios->oc, index); |
9e9db456 BH |
135 | } |
136 | ||
769ba8d9 | 137 | int _ore_get_io_state(struct ore_layout *layout, |
a1fec1db BH |
138 | struct ore_components *oc, unsigned numdevs, |
139 | unsigned sgs_per_dev, unsigned num_par_pages, | |
140 | struct ore_io_state **pios) | |
b14f8ab2 | 141 | { |
8ff660ab | 142 | struct ore_io_state *ios; |
a1fec1db BH |
143 | struct page **pages; |
144 | struct osd_sg_entry *sgilist; | |
145 | struct __alloc_all_io_state { | |
146 | struct ore_io_state ios; | |
147 | struct ore_per_dev_state per_dev[numdevs]; | |
148 | union { | |
149 | struct osd_sg_entry sglist[sgs_per_dev * numdevs]; | |
150 | struct page *pages[num_par_pages]; | |
151 | }; | |
152 | } *_aios; | |
153 | ||
154 | if (likely(sizeof(*_aios) <= PAGE_SIZE)) { | |
155 | _aios = kzalloc(sizeof(*_aios), GFP_KERNEL); | |
156 | if (unlikely(!_aios)) { | |
157 | ORE_DBGMSG("Failed kzalloc bytes=%zd\n", | |
158 | sizeof(*_aios)); | |
159 | *pios = NULL; | |
160 | return -ENOMEM; | |
161 | } | |
162 | pages = num_par_pages ? _aios->pages : NULL; | |
163 | sgilist = sgs_per_dev ? _aios->sglist : NULL; | |
164 | ios = &_aios->ios; | |
165 | } else { | |
166 | struct __alloc_small_io_state { | |
167 | struct ore_io_state ios; | |
168 | struct ore_per_dev_state per_dev[numdevs]; | |
169 | } *_aio_small; | |
170 | union __extra_part { | |
171 | struct osd_sg_entry sglist[sgs_per_dev * numdevs]; | |
172 | struct page *pages[num_par_pages]; | |
173 | } *extra_part; | |
174 | ||
175 | _aio_small = kzalloc(sizeof(*_aio_small), GFP_KERNEL); | |
176 | if (unlikely(!_aio_small)) { | |
177 | ORE_DBGMSG("Failed alloc first part bytes=%zd\n", | |
178 | sizeof(*_aio_small)); | |
179 | *pios = NULL; | |
180 | return -ENOMEM; | |
181 | } | |
182 | extra_part = kzalloc(sizeof(*extra_part), GFP_KERNEL); | |
183 | if (unlikely(!extra_part)) { | |
184 | ORE_DBGMSG("Failed alloc second part bytes=%zd\n", | |
185 | sizeof(*extra_part)); | |
186 | kfree(_aio_small); | |
187 | *pios = NULL; | |
188 | return -ENOMEM; | |
189 | } | |
06886a5a | 190 | |
a1fec1db BH |
191 | pages = num_par_pages ? extra_part->pages : NULL; |
192 | sgilist = sgs_per_dev ? extra_part->sglist : NULL; | |
193 | /* In this case the per_dev[0].sgilist holds the pointer to | |
194 | * be freed | |
195 | */ | |
196 | ios = &_aio_small->ios; | |
197 | ios->extra_part_alloc = true; | |
198 | } | |
199 | ||
200 | if (pages) { | |
201 | ios->parity_pages = pages; | |
202 | ios->max_par_pages = num_par_pages; | |
203 | } | |
204 | if (sgilist) { | |
205 | unsigned d; | |
206 | ||
207 | for (d = 0; d < numdevs; ++d) { | |
208 | ios->per_dev[d].sglist = sgilist; | |
209 | sgilist += sgs_per_dev; | |
210 | } | |
211 | ios->sgs_per_dev = sgs_per_dev; | |
06886a5a BH |
212 | } |
213 | ||
45d3abcb | 214 | ios->layout = layout; |
5bf696da | 215 | ios->oc = oc; |
b916c5cd BH |
216 | *pios = ios; |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* Allocate an io_state for only a single group of devices | |
221 | * | |
222 | * If a user needs to call ore_read/write() this version must be used becase it | |
223 | * allocates extra stuff for striping and raid. | |
224 | * The ore might decide to only IO less then @length bytes do to alignmets | |
225 | * and constrains as follows: | |
226 | * - The IO cannot cross group boundary. | |
227 | * - In raid5/6 The end of the IO must align at end of a stripe eg. | |
228 | * (@offset + @length) % strip_size == 0. Or the complete range is within a | |
229 | * single stripe. | |
230 | * - Memory condition only permitted a shorter IO. (A user can use @length=~0 | |
231 | * And check the returned ios->length for max_io_size.) | |
232 | * | |
233 | * The caller must check returned ios->length (and/or ios->nr_pages) and | |
234 | * re-issue these pages that fall outside of ios->length | |
235 | */ | |
236 | int ore_get_rw_state(struct ore_layout *layout, struct ore_components *oc, | |
237 | bool is_reading, u64 offset, u64 length, | |
238 | struct ore_io_state **pios) | |
239 | { | |
240 | struct ore_io_state *ios; | |
241 | unsigned numdevs = layout->group_width * layout->mirrors_p1; | |
a1fec1db | 242 | unsigned sgs_per_dev = 0, max_par_pages = 0; |
b916c5cd BH |
243 | int ret; |
244 | ||
a1fec1db BH |
245 | if (layout->parity && length) { |
246 | unsigned data_devs = layout->group_width - layout->parity; | |
247 | unsigned stripe_size = layout->stripe_unit * data_devs; | |
248 | unsigned pages_in_unit = layout->stripe_unit / PAGE_SIZE; | |
249 | u32 remainder; | |
250 | u64 num_stripes; | |
251 | u64 num_raid_units; | |
252 | ||
253 | num_stripes = div_u64_rem(length, stripe_size, &remainder); | |
254 | if (remainder) | |
255 | ++num_stripes; | |
256 | ||
257 | num_raid_units = num_stripes * layout->parity; | |
258 | ||
259 | if (is_reading) { | |
260 | /* For reads add per_dev sglist array */ | |
261 | /* TODO: Raid 6 we need twice more. Actually: | |
262 | * num_stripes / LCMdP(W,P); | |
263 | * if (W%P != 0) num_stripes *= parity; | |
264 | */ | |
265 | ||
266 | /* first/last seg is split */ | |
267 | num_raid_units += layout->group_width; | |
268 | sgs_per_dev = div_u64(num_raid_units, data_devs); | |
269 | } else { | |
270 | /* For Writes add parity pages array. */ | |
271 | max_par_pages = num_raid_units * pages_in_unit * | |
272 | sizeof(struct page *); | |
273 | } | |
274 | } | |
275 | ||
276 | ret = _ore_get_io_state(layout, oc, numdevs, sgs_per_dev, max_par_pages, | |
277 | pios); | |
b916c5cd BH |
278 | if (unlikely(ret)) |
279 | return ret; | |
280 | ||
281 | ios = *pios; | |
e1042ba0 | 282 | ios->reading = is_reading; |
b916c5cd BH |
283 | ios->offset = offset; |
284 | ||
285 | if (length) { | |
a1fec1db BH |
286 | ore_calc_stripe_info(layout, offset, length, &ios->si); |
287 | ios->length = ios->si.length; | |
b916c5cd | 288 | ios->nr_pages = (ios->length + PAGE_SIZE - 1) / PAGE_SIZE; |
a1fec1db BH |
289 | if (layout->parity) |
290 | _ore_post_alloc_raid_stuff(ios); | |
b916c5cd | 291 | } |
e1042ba0 | 292 | |
06886a5a | 293 | return 0; |
b14f8ab2 | 294 | } |
cf283ade | 295 | EXPORT_SYMBOL(ore_get_rw_state); |
b14f8ab2 | 296 | |
b916c5cd BH |
297 | /* Allocate an io_state for all the devices in the comps array |
298 | * | |
299 | * This version of io_state allocation is used mostly by create/remove | |
300 | * and trunc where we currently need all the devices. The only wastful | |
301 | * bit is the read/write_attributes with no IO. Those sites should | |
302 | * be converted to use ore_get_rw_state() with length=0 | |
303 | */ | |
5bf696da | 304 | int ore_get_io_state(struct ore_layout *layout, struct ore_components *oc, |
b916c5cd | 305 | struct ore_io_state **pios) |
e1042ba0 | 306 | { |
a1fec1db | 307 | return _ore_get_io_state(layout, oc, oc->numdevs, 0, 0, pios); |
e1042ba0 | 308 | } |
cf283ade | 309 | EXPORT_SYMBOL(ore_get_io_state); |
e1042ba0 | 310 | |
8ff660ab | 311 | void ore_put_io_state(struct ore_io_state *ios) |
b14f8ab2 | 312 | { |
06886a5a BH |
313 | if (ios) { |
314 | unsigned i; | |
b14f8ab2 | 315 | |
06886a5a | 316 | for (i = 0; i < ios->numdevs; i++) { |
8ff660ab | 317 | struct ore_per_dev_state *per_dev = &ios->per_dev[i]; |
06886a5a BH |
318 | |
319 | if (per_dev->or) | |
320 | osd_end_request(per_dev->or); | |
321 | if (per_dev->bio) | |
322 | bio_put(per_dev->bio); | |
323 | } | |
324 | ||
a1fec1db | 325 | _ore_free_raid_stuff(ios); |
06886a5a | 326 | kfree(ios); |
b14f8ab2 | 327 | } |
06886a5a | 328 | } |
cf283ade | 329 | EXPORT_SYMBOL(ore_put_io_state); |
b14f8ab2 | 330 | |
8ff660ab | 331 | static void _sync_done(struct ore_io_state *ios, void *p) |
06886a5a BH |
332 | { |
333 | struct completion *waiting = p; | |
b14f8ab2 | 334 | |
06886a5a BH |
335 | complete(waiting); |
336 | } | |
337 | ||
338 | static void _last_io(struct kref *kref) | |
339 | { | |
8ff660ab BH |
340 | struct ore_io_state *ios = container_of( |
341 | kref, struct ore_io_state, kref); | |
06886a5a BH |
342 | |
343 | ios->done(ios, ios->private); | |
344 | } | |
345 | ||
346 | static void _done_io(struct osd_request *or, void *p) | |
347 | { | |
8ff660ab | 348 | struct ore_io_state *ios = p; |
06886a5a BH |
349 | |
350 | kref_put(&ios->kref, _last_io); | |
351 | } | |
352 | ||
769ba8d9 | 353 | int ore_io_execute(struct ore_io_state *ios) |
06886a5a BH |
354 | { |
355 | DECLARE_COMPLETION_ONSTACK(wait); | |
356 | bool sync = (ios->done == NULL); | |
357 | int i, ret; | |
358 | ||
359 | if (sync) { | |
360 | ios->done = _sync_done; | |
361 | ios->private = &wait; | |
362 | } | |
363 | ||
364 | for (i = 0; i < ios->numdevs; i++) { | |
365 | struct osd_request *or = ios->per_dev[i].or; | |
366 | if (unlikely(!or)) | |
367 | continue; | |
368 | ||
9e9db456 | 369 | ret = osd_finalize_request(or, 0, _ios_cred(ios, i), NULL); |
06886a5a | 370 | if (unlikely(ret)) { |
8ff660ab | 371 | ORE_DBGMSG("Failed to osd_finalize_request() => %d\n", |
06886a5a BH |
372 | ret); |
373 | return ret; | |
374 | } | |
375 | } | |
376 | ||
377 | kref_init(&ios->kref); | |
378 | ||
379 | for (i = 0; i < ios->numdevs; i++) { | |
380 | struct osd_request *or = ios->per_dev[i].or; | |
381 | if (unlikely(!or)) | |
382 | continue; | |
383 | ||
384 | kref_get(&ios->kref); | |
385 | osd_execute_request_async(or, _done_io, ios); | |
386 | } | |
387 | ||
388 | kref_put(&ios->kref, _last_io); | |
389 | ret = 0; | |
390 | ||
391 | if (sync) { | |
392 | wait_for_completion(&wait); | |
8ff660ab | 393 | ret = ore_check_io(ios, NULL); |
06886a5a | 394 | } |
b14f8ab2 BH |
395 | return ret; |
396 | } | |
397 | ||
22ddc556 BH |
398 | static void _clear_bio(struct bio *bio) |
399 | { | |
400 | struct bio_vec *bv; | |
401 | unsigned i; | |
402 | ||
403 | __bio_for_each_segment(bv, bio, i, 0) { | |
404 | unsigned this_count = bv->bv_len; | |
405 | ||
406 | if (likely(PAGE_SIZE == this_count)) | |
407 | clear_highpage(bv->bv_page); | |
408 | else | |
409 | zero_user(bv->bv_page, bv->bv_offset, this_count); | |
410 | } | |
411 | } | |
412 | ||
4b46c9f5 | 413 | int ore_check_io(struct ore_io_state *ios, ore_on_dev_error on_dev_error) |
b14f8ab2 | 414 | { |
06886a5a BH |
415 | enum osd_err_priority acumulated_osd_err = 0; |
416 | int acumulated_lin_err = 0; | |
417 | int i; | |
b14f8ab2 | 418 | |
06886a5a BH |
419 | for (i = 0; i < ios->numdevs; i++) { |
420 | struct osd_sense_info osi; | |
4b46c9f5 BH |
421 | struct ore_per_dev_state *per_dev = &ios->per_dev[i]; |
422 | struct osd_request *or = per_dev->or; | |
22ddc556 BH |
423 | int ret; |
424 | ||
425 | if (unlikely(!or)) | |
426 | continue; | |
06886a5a | 427 | |
22ddc556 | 428 | ret = osd_req_decode_sense(or, &osi); |
06886a5a BH |
429 | if (likely(!ret)) |
430 | continue; | |
431 | ||
22ddc556 BH |
432 | if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) { |
433 | /* start read offset passed endof file */ | |
4b46c9f5 | 434 | _clear_bio(per_dev->bio); |
8ff660ab | 435 | ORE_DBGMSG("start read offset passed end of file " |
22ddc556 | 436 | "offset=0x%llx, length=0x%llx\n", |
4b46c9f5 BH |
437 | _LLU(per_dev->offset), |
438 | _LLU(per_dev->length)); | |
22ddc556 BH |
439 | |
440 | continue; /* we recovered */ | |
06886a5a BH |
441 | } |
442 | ||
4b46c9f5 BH |
443 | if (on_dev_error) { |
444 | u64 residual = ios->reading ? | |
445 | or->in.residual : or->out.residual; | |
446 | u64 offset = (ios->offset + ios->length) - residual; | |
447 | struct ore_dev *od = ios->oc->ods[ | |
448 | per_dev->dev - ios->oc->first_dev]; | |
449 | ||
450 | on_dev_error(ios, od, per_dev->dev, osi.osd_err_pri, | |
451 | offset, residual); | |
452 | } | |
06886a5a BH |
453 | if (osi.osd_err_pri >= acumulated_osd_err) { |
454 | acumulated_osd_err = osi.osd_err_pri; | |
455 | acumulated_lin_err = ret; | |
456 | } | |
457 | } | |
458 | ||
06886a5a BH |
459 | return acumulated_lin_err; |
460 | } | |
cf283ade | 461 | EXPORT_SYMBOL(ore_check_io); |
06886a5a | 462 | |
b367e78b BH |
463 | /* |
464 | * L - logical offset into the file | |
465 | * | |
a1fec1db BH |
466 | * D - number of Data devices |
467 | * D = group_width - parity | |
b367e78b | 468 | * |
a1fec1db BH |
469 | * U - The number of bytes in a stripe within a group |
470 | * U = stripe_unit * D | |
b367e78b | 471 | * |
50a76fd3 BH |
472 | * T - The number of bytes striped within a group of component objects |
473 | * (before advancing to the next group) | |
a1fec1db | 474 | * T = U * group_depth |
50a76fd3 BH |
475 | * |
476 | * S - The number of bytes striped across all component objects | |
477 | * before the pattern repeats | |
a1fec1db | 478 | * S = T * group_count |
50a76fd3 | 479 | * |
a1fec1db | 480 | * M - The "major" (i.e., across all components) cycle number |
50a76fd3 BH |
481 | * M = L / S |
482 | * | |
a1fec1db | 483 | * G - Counts the groups from the beginning of the major cycle |
50a76fd3 BH |
484 | * G = (L - (M * S)) / T [or (L % S) / T] |
485 | * | |
486 | * H - The byte offset within the group | |
50a76fd3 BH |
487 | * H = (L - (M * S)) % T [or (L % S) % T] |
488 | * | |
489 | * N - The "minor" (i.e., across the group) stripe number | |
50a76fd3 | 490 | * N = H / U |
b367e78b BH |
491 | * |
492 | * C - The component index coresponding to L | |
493 | * | |
a1fec1db BH |
494 | * C = (H - (N * U)) / stripe_unit + G * D |
495 | * [or (L % U) / stripe_unit + G * D] | |
b367e78b BH |
496 | * |
497 | * O - The component offset coresponding to L | |
50a76fd3 | 498 | * O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit |
a1fec1db BH |
499 | * |
500 | * LCMdP – Parity cycle: Lowest Common Multiple of group_width, parity | |
501 | * divide by parity | |
502 | * LCMdP = lcm(group_width, parity) / parity | |
503 | * | |
504 | * R - The parity Rotation stripe | |
505 | * (Note parity cycle always starts at a group's boundary) | |
506 | * R = N % LCMdP | |
507 | * | |
508 | * I = the first parity device index | |
509 | * I = (group_width + group_width - R*parity - parity) % group_width | |
510 | * | |
511 | * Craid - The component index Rotated | |
512 | * Craid = (group_width + C - R*parity) % group_width | |
513 | * (We add the group_width to avoid negative numbers modulo math) | |
b367e78b | 514 | */ |
611d7a5d | 515 | void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset, |
a1fec1db | 516 | u64 length, struct ore_striping_info *si) |
5d952b83 | 517 | { |
16f75bb3 BH |
518 | u32 stripe_unit = layout->stripe_unit; |
519 | u32 group_width = layout->group_width; | |
520 | u64 group_depth = layout->group_depth; | |
a1fec1db | 521 | u32 parity = layout->parity; |
50a76fd3 | 522 | |
a1fec1db BH |
523 | u32 D = group_width - parity; |
524 | u32 U = D * stripe_unit; | |
50a76fd3 | 525 | u64 T = U * group_depth; |
16f75bb3 | 526 | u64 S = T * layout->group_count; |
50a76fd3 BH |
527 | u64 M = div64_u64(file_offset, S); |
528 | ||
529 | /* | |
530 | G = (L - (M * S)) / T | |
531 | H = (L - (M * S)) % T | |
532 | */ | |
533 | u64 LmodS = file_offset - M * S; | |
534 | u32 G = div64_u64(LmodS, T); | |
535 | u64 H = LmodS - G * T; | |
536 | ||
537 | u32 N = div_u64(H, U); | |
538 | ||
539 | /* "H - (N * U)" is just "H % U" so it's bound to u32 */ | |
a1fec1db | 540 | u32 C = (u32)(H - (N * U)) / stripe_unit + G * group_width; |
b367e78b | 541 | |
50a76fd3 | 542 | div_u64_rem(file_offset, stripe_unit, &si->unit_off); |
5d952b83 | 543 | |
50a76fd3 BH |
544 | si->obj_offset = si->unit_off + (N * stripe_unit) + |
545 | (M * group_depth * stripe_unit); | |
546 | ||
a1fec1db BH |
547 | if (parity) { |
548 | u32 LCMdP = lcm(group_width, parity) / parity; | |
549 | /* R = N % LCMdP; */ | |
550 | u32 RxP = (N % LCMdP) * parity; | |
551 | u32 first_dev = C - C % group_width; | |
552 | ||
553 | si->par_dev = (group_width + group_width - parity - RxP) % | |
554 | group_width + first_dev; | |
555 | si->dev = (group_width + C - RxP) % group_width + first_dev; | |
556 | si->bytes_in_stripe = U; | |
557 | si->first_stripe_start = M * S + G * T + N * U; | |
558 | } else { | |
559 | /* Make the math correct see _prepare_one_group */ | |
560 | si->par_dev = group_width; | |
561 | si->dev = C; | |
562 | } | |
563 | ||
564 | si->dev *= layout->mirrors_p1; | |
565 | si->par_dev *= layout->mirrors_p1; | |
566 | si->offset = file_offset; | |
567 | si->length = T - H; | |
568 | if (si->length > length) | |
569 | si->length = length; | |
16f75bb3 | 570 | si->M = M; |
5d952b83 | 571 | } |
611d7a5d | 572 | EXPORT_SYMBOL(ore_calc_stripe_info); |
5d952b83 | 573 | |
a1fec1db BH |
574 | int _ore_add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg, |
575 | unsigned pgbase, struct page **pages, | |
576 | struct ore_per_dev_state *per_dev, int cur_len) | |
5d952b83 | 577 | { |
86093aaf | 578 | unsigned pg = *cur_pg; |
5d952b83 | 579 | struct request_queue *q = |
9e9db456 | 580 | osd_request_queue(_ios_od(ios, per_dev->dev)); |
bbf9a31b BH |
581 | unsigned len = cur_len; |
582 | int ret; | |
5d952b83 BH |
583 | |
584 | if (per_dev->bio == NULL) { | |
585 | unsigned pages_in_stripe = ios->layout->group_width * | |
586 | (ios->layout->stripe_unit / PAGE_SIZE); | |
a1fec1db BH |
587 | unsigned nr_pages = ios->nr_pages * ios->layout->group_width / |
588 | (ios->layout->group_width - | |
589 | ios->layout->parity); | |
590 | unsigned bio_size = (nr_pages + pages_in_stripe) / | |
591 | ios->layout->group_width; | |
5d952b83 BH |
592 | |
593 | per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size); | |
594 | if (unlikely(!per_dev->bio)) { | |
8ff660ab | 595 | ORE_DBGMSG("Failed to allocate BIO size=%u\n", |
5d952b83 | 596 | bio_size); |
bbf9a31b BH |
597 | ret = -ENOMEM; |
598 | goto out; | |
5d952b83 BH |
599 | } |
600 | } | |
601 | ||
602 | while (cur_len > 0) { | |
86093aaf BH |
603 | unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len); |
604 | unsigned added_len; | |
5d952b83 | 605 | |
86093aaf | 606 | cur_len -= pglen; |
5d952b83 | 607 | |
a1fec1db | 608 | added_len = bio_add_pc_page(q, per_dev->bio, pages[pg], |
86093aaf | 609 | pglen, pgbase); |
bbf9a31b | 610 | if (unlikely(pglen != added_len)) { |
a1fec1db BH |
611 | ORE_DBGMSG("Failed bio_add_pc_page bi_vcnt=%u\n", |
612 | per_dev->bio->bi_vcnt); | |
bbf9a31b BH |
613 | ret = -ENOMEM; |
614 | goto out; | |
615 | } | |
769ba8d9 BH |
616 | _add_stripe_page(ios->sp2d, &ios->si, pages[pg]); |
617 | ||
86093aaf BH |
618 | pgbase = 0; |
619 | ++pg; | |
5d952b83 BH |
620 | } |
621 | BUG_ON(cur_len); | |
622 | ||
bbf9a31b | 623 | per_dev->length += len; |
86093aaf | 624 | *cur_pg = pg; |
bbf9a31b BH |
625 | ret = 0; |
626 | out: /* we fail the complete unit on an error eg don't advance | |
627 | * per_dev->length and cur_pg. This means that we might have a bigger | |
628 | * bio than the CDB requested length (per_dev->length). That's fine | |
629 | * only the oposite is fatal. | |
630 | */ | |
631 | return ret; | |
5d952b83 BH |
632 | } |
633 | ||
98260754 | 634 | static int _prepare_for_striping(struct ore_io_state *ios) |
5d952b83 | 635 | { |
98260754 | 636 | struct ore_striping_info *si = &ios->si; |
5d952b83 | 637 | unsigned stripe_unit = ios->layout->stripe_unit; |
b367e78b | 638 | unsigned mirrors_p1 = ios->layout->mirrors_p1; |
a1fec1db BH |
639 | unsigned group_width = ios->layout->group_width; |
640 | unsigned devs_in_group = group_width * mirrors_p1; | |
b367e78b | 641 | unsigned dev = si->dev; |
50a76fd3 | 642 | unsigned first_dev = dev - (dev % devs_in_group); |
a1fec1db | 643 | unsigned dev_order; |
50a76fd3 | 644 | unsigned cur_pg = ios->pages_consumed; |
98260754 | 645 | u64 length = ios->length; |
86093aaf | 646 | int ret = 0; |
5d952b83 | 647 | |
98260754 | 648 | if (!ios->pages) { |
98260754 BH |
649 | ios->numdevs = ios->layout->mirrors_p1; |
650 | return 0; | |
651 | } | |
652 | ||
a1fec1db BH |
653 | BUG_ON(length > si->length); |
654 | ||
655 | dev_order = _dev_order(devs_in_group, mirrors_p1, si->par_dev, dev); | |
656 | si->cur_comp = dev_order; | |
769ba8d9 | 657 | si->cur_pg = si->unit_off / PAGE_SIZE; |
98260754 | 658 | |
5d952b83 | 659 | while (length) { |
b916c5cd BH |
660 | unsigned comp = dev - first_dev; |
661 | struct ore_per_dev_state *per_dev = &ios->per_dev[comp]; | |
b367e78b | 662 | unsigned cur_len, page_off = 0; |
5d952b83 BH |
663 | |
664 | if (!per_dev->length) { | |
b367e78b | 665 | per_dev->dev = dev; |
a1fec1db BH |
666 | if (dev == si->dev) { |
667 | WARN_ON(dev == si->par_dev); | |
b367e78b BH |
668 | per_dev->offset = si->obj_offset; |
669 | cur_len = stripe_unit - si->unit_off; | |
670 | page_off = si->unit_off & ~PAGE_MASK; | |
671 | BUG_ON(page_off && (page_off != ios->pgbase)); | |
a1fec1db BH |
672 | } else { |
673 | if (si->cur_comp > dev_order) | |
674 | per_dev->offset = | |
675 | si->obj_offset - si->unit_off; | |
676 | else /* si->cur_comp < dev_order */ | |
677 | per_dev->offset = | |
678 | si->obj_offset + stripe_unit - | |
679 | si->unit_off; | |
b367e78b BH |
680 | cur_len = stripe_unit; |
681 | } | |
5d952b83 | 682 | } else { |
b367e78b | 683 | cur_len = stripe_unit; |
5d952b83 | 684 | } |
b367e78b BH |
685 | if (cur_len >= length) |
686 | cur_len = length; | |
5d952b83 | 687 | |
a1fec1db BH |
688 | ret = _ore_add_stripe_unit(ios, &cur_pg, page_off, ios->pages, |
689 | per_dev, cur_len); | |
5d952b83 BH |
690 | if (unlikely(ret)) |
691 | goto out; | |
692 | ||
6e31609b BH |
693 | dev += mirrors_p1; |
694 | dev = (dev % devs_in_group) + first_dev; | |
5d952b83 BH |
695 | |
696 | length -= cur_len; | |
a1fec1db BH |
697 | |
698 | si->cur_comp = (si->cur_comp + 1) % group_width; | |
769ba8d9 BH |
699 | if (unlikely((dev == si->par_dev) || (!length && ios->sp2d))) { |
700 | if (!length && ios->sp2d) { | |
a1fec1db BH |
701 | /* If we are writing and this is the very last |
702 | * stripe. then operate on parity dev. | |
703 | */ | |
704 | dev = si->par_dev; | |
769ba8d9 BH |
705 | } |
706 | if (ios->sp2d) | |
a1fec1db BH |
707 | /* In writes cur_len just means if it's the |
708 | * last one. See _ore_add_parity_unit. | |
709 | */ | |
710 | cur_len = length; | |
711 | per_dev = &ios->per_dev[dev - first_dev]; | |
712 | if (!per_dev->length) { | |
713 | /* Only/always the parity unit of the first | |
714 | * stripe will be empty. So this is a chance to | |
715 | * initialize the per_dev info. | |
716 | */ | |
717 | per_dev->dev = dev; | |
718 | per_dev->offset = si->obj_offset - si->unit_off; | |
719 | } | |
720 | ||
721 | ret = _ore_add_parity_unit(ios, si, per_dev, cur_len); | |
722 | if (unlikely(ret)) | |
723 | goto out; | |
724 | ||
725 | /* Rotate next par_dev backwards with wraping */ | |
726 | si->par_dev = (devs_in_group + si->par_dev - | |
727 | ios->layout->parity * mirrors_p1) % | |
728 | devs_in_group + first_dev; | |
729 | /* Next stripe, start fresh */ | |
730 | si->cur_comp = 0; | |
769ba8d9 | 731 | si->cur_pg = 0; |
a1fec1db | 732 | } |
5d952b83 BH |
733 | } |
734 | out: | |
b916c5cd | 735 | ios->numdevs = devs_in_group; |
50a76fd3 | 736 | ios->pages_consumed = cur_pg; |
bbf9a31b BH |
737 | if (unlikely(ret)) { |
738 | if (length == ios->length) | |
739 | return ret; | |
740 | else | |
741 | ios->length -= length; | |
742 | } | |
743 | return 0; | |
5d952b83 BH |
744 | } |
745 | ||
8ff660ab | 746 | int ore_create(struct ore_io_state *ios) |
06886a5a BH |
747 | { |
748 | int i, ret; | |
749 | ||
5bf696da | 750 | for (i = 0; i < ios->oc->numdevs; i++) { |
06886a5a BH |
751 | struct osd_request *or; |
752 | ||
9e9db456 | 753 | or = osd_start_request(_ios_od(ios, i), GFP_KERNEL); |
06886a5a | 754 | if (unlikely(!or)) { |
8ff660ab | 755 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
06886a5a BH |
756 | ret = -ENOMEM; |
757 | goto out; | |
758 | } | |
759 | ios->per_dev[i].or = or; | |
760 | ios->numdevs++; | |
761 | ||
9e9db456 | 762 | osd_req_create_object(or, _ios_obj(ios, i)); |
06886a5a | 763 | } |
8ff660ab | 764 | ret = ore_io_execute(ios); |
06886a5a BH |
765 | |
766 | out: | |
767 | return ret; | |
768 | } | |
cf283ade | 769 | EXPORT_SYMBOL(ore_create); |
06886a5a | 770 | |
8ff660ab | 771 | int ore_remove(struct ore_io_state *ios) |
06886a5a BH |
772 | { |
773 | int i, ret; | |
774 | ||
5bf696da | 775 | for (i = 0; i < ios->oc->numdevs; i++) { |
06886a5a BH |
776 | struct osd_request *or; |
777 | ||
9e9db456 | 778 | or = osd_start_request(_ios_od(ios, i), GFP_KERNEL); |
06886a5a | 779 | if (unlikely(!or)) { |
8ff660ab | 780 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
06886a5a BH |
781 | ret = -ENOMEM; |
782 | goto out; | |
783 | } | |
784 | ios->per_dev[i].or = or; | |
785 | ios->numdevs++; | |
786 | ||
9e9db456 | 787 | osd_req_remove_object(or, _ios_obj(ios, i)); |
06886a5a | 788 | } |
8ff660ab | 789 | ret = ore_io_execute(ios); |
06886a5a BH |
790 | |
791 | out: | |
792 | return ret; | |
793 | } | |
cf283ade | 794 | EXPORT_SYMBOL(ore_remove); |
06886a5a | 795 | |
8ff660ab | 796 | static int _write_mirror(struct ore_io_state *ios, int cur_comp) |
06886a5a | 797 | { |
8ff660ab | 798 | struct ore_per_dev_state *master_dev = &ios->per_dev[cur_comp]; |
5d952b83 BH |
799 | unsigned dev = ios->per_dev[cur_comp].dev; |
800 | unsigned last_comp = cur_comp + ios->layout->mirrors_p1; | |
801 | int ret = 0; | |
06886a5a | 802 | |
50a76fd3 BH |
803 | if (ios->pages && !master_dev->length) |
804 | return 0; /* Just an empty slot */ | |
805 | ||
5d952b83 | 806 | for (; cur_comp < last_comp; ++cur_comp, ++dev) { |
8ff660ab | 807 | struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; |
06886a5a BH |
808 | struct osd_request *or; |
809 | ||
9e9db456 | 810 | or = osd_start_request(_ios_od(ios, dev), GFP_KERNEL); |
06886a5a | 811 | if (unlikely(!or)) { |
8ff660ab | 812 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
06886a5a BH |
813 | ret = -ENOMEM; |
814 | goto out; | |
815 | } | |
5d952b83 | 816 | per_dev->or = or; |
06886a5a | 817 | |
86093aaf | 818 | if (ios->pages) { |
06886a5a BH |
819 | struct bio *bio; |
820 | ||
5d952b83 | 821 | if (per_dev != master_dev) { |
04dc1e88 | 822 | bio = bio_kmalloc(GFP_KERNEL, |
5d952b83 | 823 | master_dev->bio->bi_max_vecs); |
04dc1e88 | 824 | if (unlikely(!bio)) { |
8ff660ab | 825 | ORE_DBGMSG( |
426d3107 | 826 | "Failed to allocate BIO size=%u\n", |
5d952b83 | 827 | master_dev->bio->bi_max_vecs); |
04dc1e88 BH |
828 | ret = -ENOMEM; |
829 | goto out; | |
830 | } | |
831 | ||
5d952b83 | 832 | __bio_clone(bio, master_dev->bio); |
04dc1e88 BH |
833 | bio->bi_bdev = NULL; |
834 | bio->bi_next = NULL; | |
6851a5e5 | 835 | per_dev->offset = master_dev->offset; |
5d952b83 BH |
836 | per_dev->length = master_dev->length; |
837 | per_dev->bio = bio; | |
838 | per_dev->dev = dev; | |
04dc1e88 | 839 | } else { |
5d952b83 BH |
840 | bio = master_dev->bio; |
841 | /* FIXME: bio_set_dir() */ | |
7b6d91da | 842 | bio->bi_rw |= REQ_WRITE; |
04dc1e88 | 843 | } |
06886a5a | 844 | |
9e9db456 BH |
845 | osd_req_write(or, _ios_obj(ios, dev), per_dev->offset, |
846 | bio, per_dev->length); | |
8ff660ab | 847 | ORE_DBGMSG("write(0x%llx) offset=0x%llx " |
34ce4e7c | 848 | "length=0x%llx dev=%d\n", |
9e9db456 BH |
849 | _LLU(_ios_obj(ios, dev)->id), |
850 | _LLU(per_dev->offset), | |
5d952b83 | 851 | _LLU(per_dev->length), dev); |
06886a5a | 852 | } else if (ios->kern_buff) { |
6851a5e5 BH |
853 | per_dev->offset = ios->si.obj_offset; |
854 | per_dev->dev = ios->si.dev + dev; | |
855 | ||
856 | /* no cross device without page array */ | |
857 | BUG_ON((ios->layout->group_width > 1) && | |
858 | (ios->si.unit_off + ios->length > | |
859 | ios->layout->stripe_unit)); | |
860 | ||
861 | ret = osd_req_write_kern(or, _ios_obj(ios, per_dev->dev), | |
9e9db456 BH |
862 | per_dev->offset, |
863 | ios->kern_buff, ios->length); | |
5d952b83 BH |
864 | if (unlikely(ret)) |
865 | goto out; | |
8ff660ab | 866 | ORE_DBGMSG2("write_kern(0x%llx) offset=0x%llx " |
34ce4e7c | 867 | "length=0x%llx dev=%d\n", |
9e9db456 BH |
868 | _LLU(_ios_obj(ios, dev)->id), |
869 | _LLU(per_dev->offset), | |
6851a5e5 | 870 | _LLU(ios->length), per_dev->dev); |
06886a5a | 871 | } else { |
9e9db456 | 872 | osd_req_set_attributes(or, _ios_obj(ios, dev)); |
8ff660ab | 873 | ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n", |
9e9db456 BH |
874 | _LLU(_ios_obj(ios, dev)->id), |
875 | ios->out_attr_len, dev); | |
06886a5a BH |
876 | } |
877 | ||
878 | if (ios->out_attr) | |
879 | osd_req_add_set_attr_list(or, ios->out_attr, | |
880 | ios->out_attr_len); | |
881 | ||
882 | if (ios->in_attr) | |
883 | osd_req_add_get_attr_list(or, ios->in_attr, | |
884 | ios->in_attr_len); | |
b14f8ab2 | 885 | } |
06886a5a BH |
886 | |
887 | out: | |
888 | return ret; | |
889 | } | |
890 | ||
8ff660ab | 891 | int ore_write(struct ore_io_state *ios) |
5d952b83 BH |
892 | { |
893 | int i; | |
894 | int ret; | |
895 | ||
769ba8d9 BH |
896 | if (unlikely(ios->sp2d && !ios->r4w)) { |
897 | /* A library is attempting a RAID-write without providing | |
898 | * a pages lock interface. | |
899 | */ | |
900 | WARN_ON_ONCE(1); | |
901 | return -ENOTSUPP; | |
902 | } | |
903 | ||
5d952b83 BH |
904 | ret = _prepare_for_striping(ios); |
905 | if (unlikely(ret)) | |
906 | return ret; | |
907 | ||
908 | for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { | |
8ff660ab | 909 | ret = _write_mirror(ios, i); |
5d952b83 BH |
910 | if (unlikely(ret)) |
911 | return ret; | |
912 | } | |
913 | ||
8ff660ab | 914 | ret = ore_io_execute(ios); |
5d952b83 BH |
915 | return ret; |
916 | } | |
cf283ade | 917 | EXPORT_SYMBOL(ore_write); |
5d952b83 | 918 | |
769ba8d9 | 919 | int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp) |
06886a5a | 920 | { |
46f4d973 | 921 | struct osd_request *or; |
8ff660ab | 922 | struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; |
9e9db456 BH |
923 | struct osd_obj_id *obj = _ios_obj(ios, cur_comp); |
924 | unsigned first_dev = (unsigned)obj->id; | |
06886a5a | 925 | |
50a76fd3 BH |
926 | if (ios->pages && !per_dev->length) |
927 | return 0; /* Just an empty slot */ | |
928 | ||
5d952b83 | 929 | first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1; |
9e9db456 | 930 | or = osd_start_request(_ios_od(ios, first_dev), GFP_KERNEL); |
46f4d973 | 931 | if (unlikely(!or)) { |
8ff660ab | 932 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
46f4d973 BH |
933 | return -ENOMEM; |
934 | } | |
935 | per_dev->or = or; | |
46f4d973 | 936 | |
86093aaf | 937 | if (ios->pages) { |
a1fec1db BH |
938 | if (per_dev->cur_sg) { |
939 | /* finalize the last sg_entry */ | |
940 | _ore_add_sg_seg(per_dev, 0, false); | |
941 | if (unlikely(!per_dev->cur_sg)) | |
942 | return 0; /* Skip parity only device */ | |
943 | ||
944 | osd_req_read_sg(or, obj, per_dev->bio, | |
945 | per_dev->sglist, per_dev->cur_sg); | |
946 | } else { | |
947 | /* The no raid case */ | |
948 | osd_req_read(or, obj, per_dev->offset, | |
949 | per_dev->bio, per_dev->length); | |
950 | } | |
951 | ||
8ff660ab | 952 | ORE_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx" |
a1fec1db | 953 | " dev=%d sg_len=%d\n", _LLU(obj->id), |
5d952b83 | 954 | _LLU(per_dev->offset), _LLU(per_dev->length), |
a1fec1db | 955 | first_dev, per_dev->cur_sg); |
46f4d973 | 956 | } else { |
6851a5e5 BH |
957 | BUG_ON(ios->kern_buff); |
958 | ||
9e9db456 | 959 | osd_req_get_attributes(or, obj); |
8ff660ab | 960 | ORE_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n", |
9e9db456 BH |
961 | _LLU(obj->id), |
962 | ios->in_attr_len, first_dev); | |
46f4d973 | 963 | } |
46f4d973 BH |
964 | if (ios->out_attr) |
965 | osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len); | |
b14f8ab2 | 966 | |
46f4d973 BH |
967 | if (ios->in_attr) |
968 | osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len); | |
b14f8ab2 | 969 | |
5d952b83 BH |
970 | return 0; |
971 | } | |
972 | ||
8ff660ab | 973 | int ore_read(struct ore_io_state *ios) |
5d952b83 BH |
974 | { |
975 | int i; | |
976 | int ret; | |
977 | ||
978 | ret = _prepare_for_striping(ios); | |
979 | if (unlikely(ret)) | |
980 | return ret; | |
981 | ||
982 | for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { | |
769ba8d9 | 983 | ret = _ore_read_mirror(ios, i); |
5d952b83 BH |
984 | if (unlikely(ret)) |
985 | return ret; | |
986 | } | |
987 | ||
8ff660ab | 988 | ret = ore_io_execute(ios); |
5d952b83 | 989 | return ret; |
b14f8ab2 | 990 | } |
cf283ade | 991 | EXPORT_SYMBOL(ore_read); |
b14f8ab2 | 992 | |
8ff660ab | 993 | int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr) |
b14f8ab2 BH |
994 | { |
995 | struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */ | |
996 | void *iter = NULL; | |
997 | int nelem; | |
998 | ||
999 | do { | |
1000 | nelem = 1; | |
06886a5a BH |
1001 | osd_req_decode_get_attr_list(ios->per_dev[0].or, |
1002 | &cur_attr, &nelem, &iter); | |
b14f8ab2 BH |
1003 | if ((cur_attr.attr_page == attr->attr_page) && |
1004 | (cur_attr.attr_id == attr->attr_id)) { | |
1005 | attr->len = cur_attr.len; | |
1006 | attr->val_ptr = cur_attr.val_ptr; | |
1007 | return 0; | |
1008 | } | |
1009 | } while (iter); | |
1010 | ||
1011 | return -EIO; | |
1012 | } | |
cf283ade | 1013 | EXPORT_SYMBOL(extract_attr_from_ios); |
06886a5a | 1014 | |
8ff660ab | 1015 | static int _truncate_mirrors(struct ore_io_state *ios, unsigned cur_comp, |
5d952b83 BH |
1016 | struct osd_attr *attr) |
1017 | { | |
1018 | int last_comp = cur_comp + ios->layout->mirrors_p1; | |
1019 | ||
1020 | for (; cur_comp < last_comp; ++cur_comp) { | |
8ff660ab | 1021 | struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; |
5d952b83 BH |
1022 | struct osd_request *or; |
1023 | ||
9e9db456 | 1024 | or = osd_start_request(_ios_od(ios, cur_comp), GFP_KERNEL); |
5d952b83 | 1025 | if (unlikely(!or)) { |
8ff660ab | 1026 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
5d952b83 BH |
1027 | return -ENOMEM; |
1028 | } | |
1029 | per_dev->or = or; | |
1030 | ||
9e9db456 | 1031 | osd_req_set_attributes(or, _ios_obj(ios, cur_comp)); |
5d952b83 BH |
1032 | osd_req_add_set_attr_list(or, attr, 1); |
1033 | } | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
16f75bb3 | 1038 | struct _trunc_info { |
eb507bc1 | 1039 | struct ore_striping_info si; |
16f75bb3 BH |
1040 | u64 prev_group_obj_off; |
1041 | u64 next_group_obj_off; | |
1042 | ||
1043 | unsigned first_group_dev; | |
1044 | unsigned nex_group_dev; | |
16f75bb3 BH |
1045 | }; |
1046 | ||
1958c7c2 HS |
1047 | static void _calc_trunk_info(struct ore_layout *layout, u64 file_offset, |
1048 | struct _trunc_info *ti) | |
16f75bb3 BH |
1049 | { |
1050 | unsigned stripe_unit = layout->stripe_unit; | |
1051 | ||
a1fec1db | 1052 | ore_calc_stripe_info(layout, file_offset, 0, &ti->si); |
16f75bb3 BH |
1053 | |
1054 | ti->prev_group_obj_off = ti->si.M * stripe_unit; | |
1055 | ti->next_group_obj_off = ti->si.M ? (ti->si.M - 1) * stripe_unit : 0; | |
1056 | ||
1057 | ti->first_group_dev = ti->si.dev - (ti->si.dev % layout->group_width); | |
1058 | ti->nex_group_dev = ti->first_group_dev + layout->group_width; | |
16f75bb3 BH |
1059 | } |
1060 | ||
5bf696da | 1061 | int ore_truncate(struct ore_layout *layout, struct ore_components *oc, |
9e9db456 | 1062 | u64 size) |
06886a5a | 1063 | { |
8ff660ab | 1064 | struct ore_io_state *ios; |
5d952b83 BH |
1065 | struct exofs_trunc_attr { |
1066 | struct osd_attr attr; | |
1067 | __be64 newsize; | |
1068 | } *size_attrs; | |
16f75bb3 | 1069 | struct _trunc_info ti; |
06886a5a BH |
1070 | int i, ret; |
1071 | ||
5bf696da | 1072 | ret = ore_get_io_state(layout, oc, &ios); |
5d952b83 BH |
1073 | if (unlikely(ret)) |
1074 | return ret; | |
1075 | ||
16f75bb3 BH |
1076 | _calc_trunk_info(ios->layout, size, &ti); |
1077 | ||
b916c5cd | 1078 | size_attrs = kcalloc(ios->oc->numdevs, sizeof(*size_attrs), |
5d952b83 BH |
1079 | GFP_KERNEL); |
1080 | if (unlikely(!size_attrs)) { | |
1081 | ret = -ENOMEM; | |
1082 | goto out; | |
1083 | } | |
06886a5a | 1084 | |
5bf696da | 1085 | ios->numdevs = ios->oc->numdevs; |
06886a5a | 1086 | |
b916c5cd | 1087 | for (i = 0; i < ios->numdevs; ++i) { |
5d952b83 BH |
1088 | struct exofs_trunc_attr *size_attr = &size_attrs[i]; |
1089 | u64 obj_size; | |
06886a5a | 1090 | |
16f75bb3 BH |
1091 | if (i < ti.first_group_dev) |
1092 | obj_size = ti.prev_group_obj_off; | |
1093 | else if (i >= ti.nex_group_dev) | |
1094 | obj_size = ti.next_group_obj_off; | |
1095 | else if (i < ti.si.dev) /* dev within this group */ | |
1096 | obj_size = ti.si.obj_offset + | |
1097 | ios->layout->stripe_unit - ti.si.unit_off; | |
1098 | else if (i == ti.si.dev) | |
1099 | obj_size = ti.si.obj_offset; | |
1100 | else /* i > ti.dev */ | |
1101 | obj_size = ti.si.obj_offset - ti.si.unit_off; | |
06886a5a | 1102 | |
5d952b83 BH |
1103 | size_attr->newsize = cpu_to_be64(obj_size); |
1104 | size_attr->attr = g_attr_logical_length; | |
1105 | size_attr->attr.val_ptr = &size_attr->newsize; | |
1106 | ||
8ff660ab | 1107 | ORE_DBGMSG("trunc(0x%llx) obj_offset=0x%llx dev=%d\n", |
5bf696da | 1108 | _LLU(oc->comps->obj.id), _LLU(obj_size), i); |
5d952b83 BH |
1109 | ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1, |
1110 | &size_attr->attr); | |
1111 | if (unlikely(ret)) | |
1112 | goto out; | |
06886a5a | 1113 | } |
8ff660ab | 1114 | ret = ore_io_execute(ios); |
06886a5a BH |
1115 | |
1116 | out: | |
5d952b83 | 1117 | kfree(size_attrs); |
8ff660ab | 1118 | ore_put_io_state(ios); |
06886a5a BH |
1119 | return ret; |
1120 | } | |
cf283ade | 1121 | EXPORT_SYMBOL(ore_truncate); |
85e44df4 BH |
1122 | |
1123 | const struct osd_attr g_attr_logical_length = ATTR_DEF( | |
1124 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
cf283ade | 1125 | EXPORT_SYMBOL(g_attr_logical_length); |