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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 | ||
52 | /* FIXME: Only raid0 is supported for now. */ | |
53 | if (layout->raid_algorithm != PNFS_OSD_RAID_0) { | |
54 | ORE_ERR("Only RAID_0 for now\n"); | |
55 | return -EINVAL; | |
56 | } | |
57 | if (0 != (layout->stripe_unit & ~PAGE_MASK)) { | |
58 | ORE_ERR("Stripe Unit(0x%llx)" | |
59 | " must be Multples of PAGE_SIZE(0x%lx)\n", | |
60 | _LLU(layout->stripe_unit), PAGE_SIZE); | |
61 | return -EINVAL; | |
62 | } | |
63 | if (layout->group_width) { | |
64 | if (!layout->group_depth) { | |
65 | ORE_ERR("group_depth == 0 && group_width != 0\n"); | |
66 | return -EINVAL; | |
67 | } | |
68 | if (total_comps < (layout->group_width * layout->mirrors_p1)) { | |
69 | ORE_ERR("Data Map wrong, " | |
70 | "numdevs=%d < group_width=%d * mirrors=%d\n", | |
71 | total_comps, layout->group_width, | |
72 | layout->mirrors_p1); | |
73 | return -EINVAL; | |
74 | } | |
75 | layout->group_count = total_comps / layout->mirrors_p1 / | |
76 | layout->group_width; | |
77 | } else { | |
78 | if (layout->group_depth) { | |
79 | printk(KERN_NOTICE "Warning: group_depth ignored " | |
80 | "group_width == 0 && group_depth == %lld\n", | |
81 | _LLU(layout->group_depth)); | |
82 | } | |
83 | layout->group_width = total_comps / layout->mirrors_p1; | |
84 | layout->group_depth = -1; | |
85 | layout->group_count = 1; | |
86 | } | |
87 | ||
88 | stripe_length = (u64)layout->group_width * layout->stripe_unit; | |
89 | if (stripe_length >= (1ULL << 32)) { | |
90 | ORE_ERR("Stripe_length(0x%llx) >= 32bit is not supported\n", | |
91 | _LLU(stripe_length)); | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
95 | layout->max_io_length = | |
96 | (BIO_MAX_PAGES_KMALLOC * PAGE_SIZE - layout->stripe_unit) * | |
97 | layout->group_width; | |
98 | return 0; | |
99 | } | |
100 | EXPORT_SYMBOL(ore_verify_layout); | |
101 | ||
8ff660ab | 102 | static u8 *_ios_cred(struct ore_io_state *ios, unsigned index) |
9e9db456 | 103 | { |
5bf696da | 104 | return ios->oc->comps[index & ios->oc->single_comp].cred; |
9e9db456 BH |
105 | } |
106 | ||
8ff660ab | 107 | static struct osd_obj_id *_ios_obj(struct ore_io_state *ios, unsigned index) |
9e9db456 | 108 | { |
5bf696da | 109 | return &ios->oc->comps[index & ios->oc->single_comp].obj; |
9e9db456 BH |
110 | } |
111 | ||
8ff660ab | 112 | static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index) |
9e9db456 | 113 | { |
3bd98568 BH |
114 | ORE_DBGMSG2("oc->first_dev=%d oc->numdevs=%d i=%d oc->ods=%p\n", |
115 | ios->oc->first_dev, ios->oc->numdevs, index, | |
116 | ios->oc->ods); | |
117 | ||
d866d875 | 118 | return ore_comp_dev(ios->oc, index); |
9e9db456 BH |
119 | } |
120 | ||
a1fec1db BH |
121 | static int _ore_get_io_state(struct ore_layout *layout, |
122 | struct ore_components *oc, unsigned numdevs, | |
123 | unsigned sgs_per_dev, unsigned num_par_pages, | |
124 | struct ore_io_state **pios) | |
b14f8ab2 | 125 | { |
8ff660ab | 126 | struct ore_io_state *ios; |
a1fec1db BH |
127 | struct page **pages; |
128 | struct osd_sg_entry *sgilist; | |
129 | struct __alloc_all_io_state { | |
130 | struct ore_io_state ios; | |
131 | struct ore_per_dev_state per_dev[numdevs]; | |
132 | union { | |
133 | struct osd_sg_entry sglist[sgs_per_dev * numdevs]; | |
134 | struct page *pages[num_par_pages]; | |
135 | }; | |
136 | } *_aios; | |
137 | ||
138 | if (likely(sizeof(*_aios) <= PAGE_SIZE)) { | |
139 | _aios = kzalloc(sizeof(*_aios), GFP_KERNEL); | |
140 | if (unlikely(!_aios)) { | |
141 | ORE_DBGMSG("Failed kzalloc bytes=%zd\n", | |
142 | sizeof(*_aios)); | |
143 | *pios = NULL; | |
144 | return -ENOMEM; | |
145 | } | |
146 | pages = num_par_pages ? _aios->pages : NULL; | |
147 | sgilist = sgs_per_dev ? _aios->sglist : NULL; | |
148 | ios = &_aios->ios; | |
149 | } else { | |
150 | struct __alloc_small_io_state { | |
151 | struct ore_io_state ios; | |
152 | struct ore_per_dev_state per_dev[numdevs]; | |
153 | } *_aio_small; | |
154 | union __extra_part { | |
155 | struct osd_sg_entry sglist[sgs_per_dev * numdevs]; | |
156 | struct page *pages[num_par_pages]; | |
157 | } *extra_part; | |
158 | ||
159 | _aio_small = kzalloc(sizeof(*_aio_small), GFP_KERNEL); | |
160 | if (unlikely(!_aio_small)) { | |
161 | ORE_DBGMSG("Failed alloc first part bytes=%zd\n", | |
162 | sizeof(*_aio_small)); | |
163 | *pios = NULL; | |
164 | return -ENOMEM; | |
165 | } | |
166 | extra_part = kzalloc(sizeof(*extra_part), GFP_KERNEL); | |
167 | if (unlikely(!extra_part)) { | |
168 | ORE_DBGMSG("Failed alloc second part bytes=%zd\n", | |
169 | sizeof(*extra_part)); | |
170 | kfree(_aio_small); | |
171 | *pios = NULL; | |
172 | return -ENOMEM; | |
173 | } | |
06886a5a | 174 | |
a1fec1db BH |
175 | pages = num_par_pages ? extra_part->pages : NULL; |
176 | sgilist = sgs_per_dev ? extra_part->sglist : NULL; | |
177 | /* In this case the per_dev[0].sgilist holds the pointer to | |
178 | * be freed | |
179 | */ | |
180 | ios = &_aio_small->ios; | |
181 | ios->extra_part_alloc = true; | |
182 | } | |
183 | ||
184 | if (pages) { | |
185 | ios->parity_pages = pages; | |
186 | ios->max_par_pages = num_par_pages; | |
187 | } | |
188 | if (sgilist) { | |
189 | unsigned d; | |
190 | ||
191 | for (d = 0; d < numdevs; ++d) { | |
192 | ios->per_dev[d].sglist = sgilist; | |
193 | sgilist += sgs_per_dev; | |
194 | } | |
195 | ios->sgs_per_dev = sgs_per_dev; | |
06886a5a BH |
196 | } |
197 | ||
45d3abcb | 198 | ios->layout = layout; |
5bf696da | 199 | ios->oc = oc; |
b916c5cd BH |
200 | *pios = ios; |
201 | return 0; | |
202 | } | |
203 | ||
204 | /* Allocate an io_state for only a single group of devices | |
205 | * | |
206 | * If a user needs to call ore_read/write() this version must be used becase it | |
207 | * allocates extra stuff for striping and raid. | |
208 | * The ore might decide to only IO less then @length bytes do to alignmets | |
209 | * and constrains as follows: | |
210 | * - The IO cannot cross group boundary. | |
211 | * - In raid5/6 The end of the IO must align at end of a stripe eg. | |
212 | * (@offset + @length) % strip_size == 0. Or the complete range is within a | |
213 | * single stripe. | |
214 | * - Memory condition only permitted a shorter IO. (A user can use @length=~0 | |
215 | * And check the returned ios->length for max_io_size.) | |
216 | * | |
217 | * The caller must check returned ios->length (and/or ios->nr_pages) and | |
218 | * re-issue these pages that fall outside of ios->length | |
219 | */ | |
220 | int ore_get_rw_state(struct ore_layout *layout, struct ore_components *oc, | |
221 | bool is_reading, u64 offset, u64 length, | |
222 | struct ore_io_state **pios) | |
223 | { | |
224 | struct ore_io_state *ios; | |
225 | unsigned numdevs = layout->group_width * layout->mirrors_p1; | |
a1fec1db | 226 | unsigned sgs_per_dev = 0, max_par_pages = 0; |
b916c5cd BH |
227 | int ret; |
228 | ||
a1fec1db BH |
229 | if (layout->parity && length) { |
230 | unsigned data_devs = layout->group_width - layout->parity; | |
231 | unsigned stripe_size = layout->stripe_unit * data_devs; | |
232 | unsigned pages_in_unit = layout->stripe_unit / PAGE_SIZE; | |
233 | u32 remainder; | |
234 | u64 num_stripes; | |
235 | u64 num_raid_units; | |
236 | ||
237 | num_stripes = div_u64_rem(length, stripe_size, &remainder); | |
238 | if (remainder) | |
239 | ++num_stripes; | |
240 | ||
241 | num_raid_units = num_stripes * layout->parity; | |
242 | ||
243 | if (is_reading) { | |
244 | /* For reads add per_dev sglist array */ | |
245 | /* TODO: Raid 6 we need twice more. Actually: | |
246 | * num_stripes / LCMdP(W,P); | |
247 | * if (W%P != 0) num_stripes *= parity; | |
248 | */ | |
249 | ||
250 | /* first/last seg is split */ | |
251 | num_raid_units += layout->group_width; | |
252 | sgs_per_dev = div_u64(num_raid_units, data_devs); | |
253 | } else { | |
254 | /* For Writes add parity pages array. */ | |
255 | max_par_pages = num_raid_units * pages_in_unit * | |
256 | sizeof(struct page *); | |
257 | } | |
258 | } | |
259 | ||
260 | ret = _ore_get_io_state(layout, oc, numdevs, sgs_per_dev, max_par_pages, | |
261 | pios); | |
b916c5cd BH |
262 | if (unlikely(ret)) |
263 | return ret; | |
264 | ||
265 | ios = *pios; | |
e1042ba0 | 266 | ios->reading = is_reading; |
b916c5cd BH |
267 | ios->offset = offset; |
268 | ||
269 | if (length) { | |
a1fec1db BH |
270 | ore_calc_stripe_info(layout, offset, length, &ios->si); |
271 | ios->length = ios->si.length; | |
b916c5cd | 272 | ios->nr_pages = (ios->length + PAGE_SIZE - 1) / PAGE_SIZE; |
a1fec1db BH |
273 | if (layout->parity) |
274 | _ore_post_alloc_raid_stuff(ios); | |
b916c5cd | 275 | } |
e1042ba0 | 276 | |
06886a5a | 277 | return 0; |
b14f8ab2 | 278 | } |
cf283ade | 279 | EXPORT_SYMBOL(ore_get_rw_state); |
b14f8ab2 | 280 | |
b916c5cd BH |
281 | /* Allocate an io_state for all the devices in the comps array |
282 | * | |
283 | * This version of io_state allocation is used mostly by create/remove | |
284 | * and trunc where we currently need all the devices. The only wastful | |
285 | * bit is the read/write_attributes with no IO. Those sites should | |
286 | * be converted to use ore_get_rw_state() with length=0 | |
287 | */ | |
5bf696da | 288 | int ore_get_io_state(struct ore_layout *layout, struct ore_components *oc, |
b916c5cd | 289 | struct ore_io_state **pios) |
e1042ba0 | 290 | { |
a1fec1db | 291 | return _ore_get_io_state(layout, oc, oc->numdevs, 0, 0, pios); |
e1042ba0 | 292 | } |
cf283ade | 293 | EXPORT_SYMBOL(ore_get_io_state); |
e1042ba0 | 294 | |
8ff660ab | 295 | void ore_put_io_state(struct ore_io_state *ios) |
b14f8ab2 | 296 | { |
06886a5a BH |
297 | if (ios) { |
298 | unsigned i; | |
b14f8ab2 | 299 | |
06886a5a | 300 | for (i = 0; i < ios->numdevs; i++) { |
8ff660ab | 301 | struct ore_per_dev_state *per_dev = &ios->per_dev[i]; |
06886a5a BH |
302 | |
303 | if (per_dev->or) | |
304 | osd_end_request(per_dev->or); | |
305 | if (per_dev->bio) | |
306 | bio_put(per_dev->bio); | |
307 | } | |
308 | ||
a1fec1db | 309 | _ore_free_raid_stuff(ios); |
06886a5a | 310 | kfree(ios); |
b14f8ab2 | 311 | } |
06886a5a | 312 | } |
cf283ade | 313 | EXPORT_SYMBOL(ore_put_io_state); |
b14f8ab2 | 314 | |
8ff660ab | 315 | static void _sync_done(struct ore_io_state *ios, void *p) |
06886a5a BH |
316 | { |
317 | struct completion *waiting = p; | |
b14f8ab2 | 318 | |
06886a5a BH |
319 | complete(waiting); |
320 | } | |
321 | ||
322 | static void _last_io(struct kref *kref) | |
323 | { | |
8ff660ab BH |
324 | struct ore_io_state *ios = container_of( |
325 | kref, struct ore_io_state, kref); | |
06886a5a BH |
326 | |
327 | ios->done(ios, ios->private); | |
328 | } | |
329 | ||
330 | static void _done_io(struct osd_request *or, void *p) | |
331 | { | |
8ff660ab | 332 | struct ore_io_state *ios = p; |
06886a5a BH |
333 | |
334 | kref_put(&ios->kref, _last_io); | |
335 | } | |
336 | ||
8ff660ab | 337 | static int ore_io_execute(struct ore_io_state *ios) |
06886a5a BH |
338 | { |
339 | DECLARE_COMPLETION_ONSTACK(wait); | |
340 | bool sync = (ios->done == NULL); | |
341 | int i, ret; | |
342 | ||
343 | if (sync) { | |
344 | ios->done = _sync_done; | |
345 | ios->private = &wait; | |
346 | } | |
347 | ||
348 | for (i = 0; i < ios->numdevs; i++) { | |
349 | struct osd_request *or = ios->per_dev[i].or; | |
350 | if (unlikely(!or)) | |
351 | continue; | |
352 | ||
9e9db456 | 353 | ret = osd_finalize_request(or, 0, _ios_cred(ios, i), NULL); |
06886a5a | 354 | if (unlikely(ret)) { |
8ff660ab | 355 | ORE_DBGMSG("Failed to osd_finalize_request() => %d\n", |
06886a5a BH |
356 | ret); |
357 | return ret; | |
358 | } | |
359 | } | |
360 | ||
361 | kref_init(&ios->kref); | |
362 | ||
363 | for (i = 0; i < ios->numdevs; i++) { | |
364 | struct osd_request *or = ios->per_dev[i].or; | |
365 | if (unlikely(!or)) | |
366 | continue; | |
367 | ||
368 | kref_get(&ios->kref); | |
369 | osd_execute_request_async(or, _done_io, ios); | |
370 | } | |
371 | ||
372 | kref_put(&ios->kref, _last_io); | |
373 | ret = 0; | |
374 | ||
375 | if (sync) { | |
376 | wait_for_completion(&wait); | |
8ff660ab | 377 | ret = ore_check_io(ios, NULL); |
06886a5a | 378 | } |
b14f8ab2 BH |
379 | return ret; |
380 | } | |
381 | ||
22ddc556 BH |
382 | static void _clear_bio(struct bio *bio) |
383 | { | |
384 | struct bio_vec *bv; | |
385 | unsigned i; | |
386 | ||
387 | __bio_for_each_segment(bv, bio, i, 0) { | |
388 | unsigned this_count = bv->bv_len; | |
389 | ||
390 | if (likely(PAGE_SIZE == this_count)) | |
391 | clear_highpage(bv->bv_page); | |
392 | else | |
393 | zero_user(bv->bv_page, bv->bv_offset, this_count); | |
394 | } | |
395 | } | |
396 | ||
4b46c9f5 | 397 | int ore_check_io(struct ore_io_state *ios, ore_on_dev_error on_dev_error) |
b14f8ab2 | 398 | { |
06886a5a BH |
399 | enum osd_err_priority acumulated_osd_err = 0; |
400 | int acumulated_lin_err = 0; | |
401 | int i; | |
b14f8ab2 | 402 | |
06886a5a BH |
403 | for (i = 0; i < ios->numdevs; i++) { |
404 | struct osd_sense_info osi; | |
4b46c9f5 BH |
405 | struct ore_per_dev_state *per_dev = &ios->per_dev[i]; |
406 | struct osd_request *or = per_dev->or; | |
22ddc556 BH |
407 | int ret; |
408 | ||
409 | if (unlikely(!or)) | |
410 | continue; | |
06886a5a | 411 | |
22ddc556 | 412 | ret = osd_req_decode_sense(or, &osi); |
06886a5a BH |
413 | if (likely(!ret)) |
414 | continue; | |
415 | ||
22ddc556 BH |
416 | if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) { |
417 | /* start read offset passed endof file */ | |
4b46c9f5 | 418 | _clear_bio(per_dev->bio); |
8ff660ab | 419 | ORE_DBGMSG("start read offset passed end of file " |
22ddc556 | 420 | "offset=0x%llx, length=0x%llx\n", |
4b46c9f5 BH |
421 | _LLU(per_dev->offset), |
422 | _LLU(per_dev->length)); | |
22ddc556 BH |
423 | |
424 | continue; /* we recovered */ | |
06886a5a BH |
425 | } |
426 | ||
4b46c9f5 BH |
427 | if (on_dev_error) { |
428 | u64 residual = ios->reading ? | |
429 | or->in.residual : or->out.residual; | |
430 | u64 offset = (ios->offset + ios->length) - residual; | |
431 | struct ore_dev *od = ios->oc->ods[ | |
432 | per_dev->dev - ios->oc->first_dev]; | |
433 | ||
434 | on_dev_error(ios, od, per_dev->dev, osi.osd_err_pri, | |
435 | offset, residual); | |
436 | } | |
06886a5a BH |
437 | if (osi.osd_err_pri >= acumulated_osd_err) { |
438 | acumulated_osd_err = osi.osd_err_pri; | |
439 | acumulated_lin_err = ret; | |
440 | } | |
441 | } | |
442 | ||
06886a5a BH |
443 | return acumulated_lin_err; |
444 | } | |
cf283ade | 445 | EXPORT_SYMBOL(ore_check_io); |
06886a5a | 446 | |
b367e78b BH |
447 | /* |
448 | * L - logical offset into the file | |
449 | * | |
a1fec1db BH |
450 | * D - number of Data devices |
451 | * D = group_width - parity | |
b367e78b | 452 | * |
a1fec1db BH |
453 | * U - The number of bytes in a stripe within a group |
454 | * U = stripe_unit * D | |
b367e78b | 455 | * |
50a76fd3 BH |
456 | * T - The number of bytes striped within a group of component objects |
457 | * (before advancing to the next group) | |
a1fec1db | 458 | * T = U * group_depth |
50a76fd3 BH |
459 | * |
460 | * S - The number of bytes striped across all component objects | |
461 | * before the pattern repeats | |
a1fec1db | 462 | * S = T * group_count |
50a76fd3 | 463 | * |
a1fec1db | 464 | * M - The "major" (i.e., across all components) cycle number |
50a76fd3 BH |
465 | * M = L / S |
466 | * | |
a1fec1db | 467 | * G - Counts the groups from the beginning of the major cycle |
50a76fd3 BH |
468 | * G = (L - (M * S)) / T [or (L % S) / T] |
469 | * | |
470 | * H - The byte offset within the group | |
50a76fd3 BH |
471 | * H = (L - (M * S)) % T [or (L % S) % T] |
472 | * | |
473 | * N - The "minor" (i.e., across the group) stripe number | |
50a76fd3 | 474 | * N = H / U |
b367e78b BH |
475 | * |
476 | * C - The component index coresponding to L | |
477 | * | |
a1fec1db BH |
478 | * C = (H - (N * U)) / stripe_unit + G * D |
479 | * [or (L % U) / stripe_unit + G * D] | |
b367e78b BH |
480 | * |
481 | * O - The component offset coresponding to L | |
50a76fd3 | 482 | * O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit |
a1fec1db BH |
483 | * |
484 | * LCMdP – Parity cycle: Lowest Common Multiple of group_width, parity | |
485 | * divide by parity | |
486 | * LCMdP = lcm(group_width, parity) / parity | |
487 | * | |
488 | * R - The parity Rotation stripe | |
489 | * (Note parity cycle always starts at a group's boundary) | |
490 | * R = N % LCMdP | |
491 | * | |
492 | * I = the first parity device index | |
493 | * I = (group_width + group_width - R*parity - parity) % group_width | |
494 | * | |
495 | * Craid - The component index Rotated | |
496 | * Craid = (group_width + C - R*parity) % group_width | |
497 | * (We add the group_width to avoid negative numbers modulo math) | |
b367e78b | 498 | */ |
611d7a5d | 499 | void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset, |
a1fec1db | 500 | u64 length, struct ore_striping_info *si) |
5d952b83 | 501 | { |
16f75bb3 BH |
502 | u32 stripe_unit = layout->stripe_unit; |
503 | u32 group_width = layout->group_width; | |
504 | u64 group_depth = layout->group_depth; | |
a1fec1db | 505 | u32 parity = layout->parity; |
50a76fd3 | 506 | |
a1fec1db BH |
507 | u32 D = group_width - parity; |
508 | u32 U = D * stripe_unit; | |
50a76fd3 | 509 | u64 T = U * group_depth; |
16f75bb3 | 510 | u64 S = T * layout->group_count; |
50a76fd3 BH |
511 | u64 M = div64_u64(file_offset, S); |
512 | ||
513 | /* | |
514 | G = (L - (M * S)) / T | |
515 | H = (L - (M * S)) % T | |
516 | */ | |
517 | u64 LmodS = file_offset - M * S; | |
518 | u32 G = div64_u64(LmodS, T); | |
519 | u64 H = LmodS - G * T; | |
520 | ||
521 | u32 N = div_u64(H, U); | |
522 | ||
523 | /* "H - (N * U)" is just "H % U" so it's bound to u32 */ | |
a1fec1db | 524 | u32 C = (u32)(H - (N * U)) / stripe_unit + G * group_width; |
b367e78b | 525 | |
50a76fd3 | 526 | div_u64_rem(file_offset, stripe_unit, &si->unit_off); |
5d952b83 | 527 | |
50a76fd3 BH |
528 | si->obj_offset = si->unit_off + (N * stripe_unit) + |
529 | (M * group_depth * stripe_unit); | |
530 | ||
a1fec1db BH |
531 | if (parity) { |
532 | u32 LCMdP = lcm(group_width, parity) / parity; | |
533 | /* R = N % LCMdP; */ | |
534 | u32 RxP = (N % LCMdP) * parity; | |
535 | u32 first_dev = C - C % group_width; | |
536 | ||
537 | si->par_dev = (group_width + group_width - parity - RxP) % | |
538 | group_width + first_dev; | |
539 | si->dev = (group_width + C - RxP) % group_width + first_dev; | |
540 | si->bytes_in_stripe = U; | |
541 | si->first_stripe_start = M * S + G * T + N * U; | |
542 | } else { | |
543 | /* Make the math correct see _prepare_one_group */ | |
544 | si->par_dev = group_width; | |
545 | si->dev = C; | |
546 | } | |
547 | ||
548 | si->dev *= layout->mirrors_p1; | |
549 | si->par_dev *= layout->mirrors_p1; | |
550 | si->offset = file_offset; | |
551 | si->length = T - H; | |
552 | if (si->length > length) | |
553 | si->length = length; | |
16f75bb3 | 554 | si->M = M; |
5d952b83 | 555 | } |
611d7a5d | 556 | EXPORT_SYMBOL(ore_calc_stripe_info); |
5d952b83 | 557 | |
a1fec1db BH |
558 | int _ore_add_stripe_unit(struct ore_io_state *ios, unsigned *cur_pg, |
559 | unsigned pgbase, struct page **pages, | |
560 | struct ore_per_dev_state *per_dev, int cur_len) | |
5d952b83 | 561 | { |
86093aaf | 562 | unsigned pg = *cur_pg; |
5d952b83 | 563 | struct request_queue *q = |
9e9db456 | 564 | osd_request_queue(_ios_od(ios, per_dev->dev)); |
bbf9a31b BH |
565 | unsigned len = cur_len; |
566 | int ret; | |
5d952b83 BH |
567 | |
568 | if (per_dev->bio == NULL) { | |
569 | unsigned pages_in_stripe = ios->layout->group_width * | |
570 | (ios->layout->stripe_unit / PAGE_SIZE); | |
a1fec1db BH |
571 | unsigned nr_pages = ios->nr_pages * ios->layout->group_width / |
572 | (ios->layout->group_width - | |
573 | ios->layout->parity); | |
574 | unsigned bio_size = (nr_pages + pages_in_stripe) / | |
575 | ios->layout->group_width; | |
5d952b83 BH |
576 | |
577 | per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size); | |
578 | if (unlikely(!per_dev->bio)) { | |
8ff660ab | 579 | ORE_DBGMSG("Failed to allocate BIO size=%u\n", |
5d952b83 | 580 | bio_size); |
bbf9a31b BH |
581 | ret = -ENOMEM; |
582 | goto out; | |
5d952b83 BH |
583 | } |
584 | } | |
585 | ||
586 | while (cur_len > 0) { | |
86093aaf BH |
587 | unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len); |
588 | unsigned added_len; | |
5d952b83 | 589 | |
86093aaf | 590 | cur_len -= pglen; |
5d952b83 | 591 | |
a1fec1db | 592 | added_len = bio_add_pc_page(q, per_dev->bio, pages[pg], |
86093aaf | 593 | pglen, pgbase); |
bbf9a31b | 594 | if (unlikely(pglen != added_len)) { |
a1fec1db BH |
595 | ORE_DBGMSG("Failed bio_add_pc_page bi_vcnt=%u\n", |
596 | per_dev->bio->bi_vcnt); | |
bbf9a31b BH |
597 | ret = -ENOMEM; |
598 | goto out; | |
599 | } | |
86093aaf BH |
600 | pgbase = 0; |
601 | ++pg; | |
5d952b83 BH |
602 | } |
603 | BUG_ON(cur_len); | |
604 | ||
bbf9a31b | 605 | per_dev->length += len; |
86093aaf | 606 | *cur_pg = pg; |
bbf9a31b BH |
607 | ret = 0; |
608 | out: /* we fail the complete unit on an error eg don't advance | |
609 | * per_dev->length and cur_pg. This means that we might have a bigger | |
610 | * bio than the CDB requested length (per_dev->length). That's fine | |
611 | * only the oposite is fatal. | |
612 | */ | |
613 | return ret; | |
5d952b83 BH |
614 | } |
615 | ||
98260754 | 616 | static int _prepare_for_striping(struct ore_io_state *ios) |
5d952b83 | 617 | { |
98260754 | 618 | struct ore_striping_info *si = &ios->si; |
5d952b83 | 619 | unsigned stripe_unit = ios->layout->stripe_unit; |
b367e78b | 620 | unsigned mirrors_p1 = ios->layout->mirrors_p1; |
a1fec1db BH |
621 | unsigned group_width = ios->layout->group_width; |
622 | unsigned devs_in_group = group_width * mirrors_p1; | |
b367e78b | 623 | unsigned dev = si->dev; |
50a76fd3 | 624 | unsigned first_dev = dev - (dev % devs_in_group); |
a1fec1db | 625 | unsigned dev_order; |
50a76fd3 | 626 | unsigned cur_pg = ios->pages_consumed; |
98260754 | 627 | u64 length = ios->length; |
86093aaf | 628 | int ret = 0; |
5d952b83 | 629 | |
98260754 | 630 | if (!ios->pages) { |
98260754 BH |
631 | ios->numdevs = ios->layout->mirrors_p1; |
632 | return 0; | |
633 | } | |
634 | ||
a1fec1db BH |
635 | BUG_ON(length > si->length); |
636 | ||
637 | dev_order = _dev_order(devs_in_group, mirrors_p1, si->par_dev, dev); | |
638 | si->cur_comp = dev_order; | |
98260754 | 639 | |
5d952b83 | 640 | while (length) { |
b916c5cd BH |
641 | unsigned comp = dev - first_dev; |
642 | struct ore_per_dev_state *per_dev = &ios->per_dev[comp]; | |
b367e78b | 643 | unsigned cur_len, page_off = 0; |
5d952b83 BH |
644 | |
645 | if (!per_dev->length) { | |
b367e78b | 646 | per_dev->dev = dev; |
a1fec1db BH |
647 | if (dev == si->dev) { |
648 | WARN_ON(dev == si->par_dev); | |
b367e78b BH |
649 | per_dev->offset = si->obj_offset; |
650 | cur_len = stripe_unit - si->unit_off; | |
651 | page_off = si->unit_off & ~PAGE_MASK; | |
652 | BUG_ON(page_off && (page_off != ios->pgbase)); | |
a1fec1db BH |
653 | } else { |
654 | if (si->cur_comp > dev_order) | |
655 | per_dev->offset = | |
656 | si->obj_offset - si->unit_off; | |
657 | else /* si->cur_comp < dev_order */ | |
658 | per_dev->offset = | |
659 | si->obj_offset + stripe_unit - | |
660 | si->unit_off; | |
b367e78b BH |
661 | cur_len = stripe_unit; |
662 | } | |
5d952b83 | 663 | } else { |
b367e78b | 664 | cur_len = stripe_unit; |
5d952b83 | 665 | } |
b367e78b BH |
666 | if (cur_len >= length) |
667 | cur_len = length; | |
5d952b83 | 668 | |
a1fec1db BH |
669 | ret = _ore_add_stripe_unit(ios, &cur_pg, page_off, ios->pages, |
670 | per_dev, cur_len); | |
5d952b83 BH |
671 | if (unlikely(ret)) |
672 | goto out; | |
673 | ||
6e31609b BH |
674 | dev += mirrors_p1; |
675 | dev = (dev % devs_in_group) + first_dev; | |
5d952b83 BH |
676 | |
677 | length -= cur_len; | |
a1fec1db BH |
678 | |
679 | si->cur_comp = (si->cur_comp + 1) % group_width; | |
680 | if (unlikely((dev == si->par_dev) || | |
681 | (!length && ios->parity_pages))) { | |
682 | if (!length) | |
683 | /* If we are writing and this is the very last | |
684 | * stripe. then operate on parity dev. | |
685 | */ | |
686 | dev = si->par_dev; | |
687 | if (ios->reading) | |
688 | /* In writes cur_len just means if it's the | |
689 | * last one. See _ore_add_parity_unit. | |
690 | */ | |
691 | cur_len = length; | |
692 | per_dev = &ios->per_dev[dev - first_dev]; | |
693 | if (!per_dev->length) { | |
694 | /* Only/always the parity unit of the first | |
695 | * stripe will be empty. So this is a chance to | |
696 | * initialize the per_dev info. | |
697 | */ | |
698 | per_dev->dev = dev; | |
699 | per_dev->offset = si->obj_offset - si->unit_off; | |
700 | } | |
701 | ||
702 | ret = _ore_add_parity_unit(ios, si, per_dev, cur_len); | |
703 | if (unlikely(ret)) | |
704 | goto out; | |
705 | ||
706 | /* Rotate next par_dev backwards with wraping */ | |
707 | si->par_dev = (devs_in_group + si->par_dev - | |
708 | ios->layout->parity * mirrors_p1) % | |
709 | devs_in_group + first_dev; | |
710 | /* Next stripe, start fresh */ | |
711 | si->cur_comp = 0; | |
712 | } | |
5d952b83 BH |
713 | } |
714 | out: | |
b916c5cd | 715 | ios->numdevs = devs_in_group; |
50a76fd3 | 716 | ios->pages_consumed = cur_pg; |
bbf9a31b BH |
717 | if (unlikely(ret)) { |
718 | if (length == ios->length) | |
719 | return ret; | |
720 | else | |
721 | ios->length -= length; | |
722 | } | |
723 | return 0; | |
5d952b83 BH |
724 | } |
725 | ||
8ff660ab | 726 | int ore_create(struct ore_io_state *ios) |
06886a5a BH |
727 | { |
728 | int i, ret; | |
729 | ||
5bf696da | 730 | for (i = 0; i < ios->oc->numdevs; i++) { |
06886a5a BH |
731 | struct osd_request *or; |
732 | ||
9e9db456 | 733 | or = osd_start_request(_ios_od(ios, i), GFP_KERNEL); |
06886a5a | 734 | if (unlikely(!or)) { |
8ff660ab | 735 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
06886a5a BH |
736 | ret = -ENOMEM; |
737 | goto out; | |
738 | } | |
739 | ios->per_dev[i].or = or; | |
740 | ios->numdevs++; | |
741 | ||
9e9db456 | 742 | osd_req_create_object(or, _ios_obj(ios, i)); |
06886a5a | 743 | } |
8ff660ab | 744 | ret = ore_io_execute(ios); |
06886a5a BH |
745 | |
746 | out: | |
747 | return ret; | |
748 | } | |
cf283ade | 749 | EXPORT_SYMBOL(ore_create); |
06886a5a | 750 | |
8ff660ab | 751 | int ore_remove(struct ore_io_state *ios) |
06886a5a BH |
752 | { |
753 | int i, ret; | |
754 | ||
5bf696da | 755 | for (i = 0; i < ios->oc->numdevs; i++) { |
06886a5a BH |
756 | struct osd_request *or; |
757 | ||
9e9db456 | 758 | or = osd_start_request(_ios_od(ios, i), GFP_KERNEL); |
06886a5a | 759 | if (unlikely(!or)) { |
8ff660ab | 760 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
06886a5a BH |
761 | ret = -ENOMEM; |
762 | goto out; | |
763 | } | |
764 | ios->per_dev[i].or = or; | |
765 | ios->numdevs++; | |
766 | ||
9e9db456 | 767 | osd_req_remove_object(or, _ios_obj(ios, i)); |
06886a5a | 768 | } |
8ff660ab | 769 | ret = ore_io_execute(ios); |
06886a5a BH |
770 | |
771 | out: | |
772 | return ret; | |
773 | } | |
cf283ade | 774 | EXPORT_SYMBOL(ore_remove); |
06886a5a | 775 | |
8ff660ab | 776 | static int _write_mirror(struct ore_io_state *ios, int cur_comp) |
06886a5a | 777 | { |
8ff660ab | 778 | struct ore_per_dev_state *master_dev = &ios->per_dev[cur_comp]; |
5d952b83 BH |
779 | unsigned dev = ios->per_dev[cur_comp].dev; |
780 | unsigned last_comp = cur_comp + ios->layout->mirrors_p1; | |
781 | int ret = 0; | |
06886a5a | 782 | |
50a76fd3 BH |
783 | if (ios->pages && !master_dev->length) |
784 | return 0; /* Just an empty slot */ | |
785 | ||
5d952b83 | 786 | for (; cur_comp < last_comp; ++cur_comp, ++dev) { |
8ff660ab | 787 | struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; |
06886a5a BH |
788 | struct osd_request *or; |
789 | ||
9e9db456 | 790 | or = osd_start_request(_ios_od(ios, dev), GFP_KERNEL); |
06886a5a | 791 | if (unlikely(!or)) { |
8ff660ab | 792 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
06886a5a BH |
793 | ret = -ENOMEM; |
794 | goto out; | |
795 | } | |
5d952b83 | 796 | per_dev->or = or; |
06886a5a | 797 | |
86093aaf | 798 | if (ios->pages) { |
06886a5a BH |
799 | struct bio *bio; |
800 | ||
5d952b83 | 801 | if (per_dev != master_dev) { |
04dc1e88 | 802 | bio = bio_kmalloc(GFP_KERNEL, |
5d952b83 | 803 | master_dev->bio->bi_max_vecs); |
04dc1e88 | 804 | if (unlikely(!bio)) { |
8ff660ab | 805 | ORE_DBGMSG( |
426d3107 | 806 | "Failed to allocate BIO size=%u\n", |
5d952b83 | 807 | master_dev->bio->bi_max_vecs); |
04dc1e88 BH |
808 | ret = -ENOMEM; |
809 | goto out; | |
810 | } | |
811 | ||
5d952b83 | 812 | __bio_clone(bio, master_dev->bio); |
04dc1e88 BH |
813 | bio->bi_bdev = NULL; |
814 | bio->bi_next = NULL; | |
6851a5e5 | 815 | per_dev->offset = master_dev->offset; |
5d952b83 BH |
816 | per_dev->length = master_dev->length; |
817 | per_dev->bio = bio; | |
818 | per_dev->dev = dev; | |
04dc1e88 | 819 | } else { |
5d952b83 BH |
820 | bio = master_dev->bio; |
821 | /* FIXME: bio_set_dir() */ | |
7b6d91da | 822 | bio->bi_rw |= REQ_WRITE; |
04dc1e88 | 823 | } |
06886a5a | 824 | |
9e9db456 BH |
825 | osd_req_write(or, _ios_obj(ios, dev), per_dev->offset, |
826 | bio, per_dev->length); | |
8ff660ab | 827 | ORE_DBGMSG("write(0x%llx) offset=0x%llx " |
34ce4e7c | 828 | "length=0x%llx dev=%d\n", |
9e9db456 BH |
829 | _LLU(_ios_obj(ios, dev)->id), |
830 | _LLU(per_dev->offset), | |
5d952b83 | 831 | _LLU(per_dev->length), dev); |
06886a5a | 832 | } else if (ios->kern_buff) { |
6851a5e5 BH |
833 | per_dev->offset = ios->si.obj_offset; |
834 | per_dev->dev = ios->si.dev + dev; | |
835 | ||
836 | /* no cross device without page array */ | |
837 | BUG_ON((ios->layout->group_width > 1) && | |
838 | (ios->si.unit_off + ios->length > | |
839 | ios->layout->stripe_unit)); | |
840 | ||
841 | ret = osd_req_write_kern(or, _ios_obj(ios, per_dev->dev), | |
9e9db456 BH |
842 | per_dev->offset, |
843 | ios->kern_buff, ios->length); | |
5d952b83 BH |
844 | if (unlikely(ret)) |
845 | goto out; | |
8ff660ab | 846 | ORE_DBGMSG2("write_kern(0x%llx) offset=0x%llx " |
34ce4e7c | 847 | "length=0x%llx dev=%d\n", |
9e9db456 BH |
848 | _LLU(_ios_obj(ios, dev)->id), |
849 | _LLU(per_dev->offset), | |
6851a5e5 | 850 | _LLU(ios->length), per_dev->dev); |
06886a5a | 851 | } else { |
9e9db456 | 852 | osd_req_set_attributes(or, _ios_obj(ios, dev)); |
8ff660ab | 853 | ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n", |
9e9db456 BH |
854 | _LLU(_ios_obj(ios, dev)->id), |
855 | ios->out_attr_len, dev); | |
06886a5a BH |
856 | } |
857 | ||
858 | if (ios->out_attr) | |
859 | osd_req_add_set_attr_list(or, ios->out_attr, | |
860 | ios->out_attr_len); | |
861 | ||
862 | if (ios->in_attr) | |
863 | osd_req_add_get_attr_list(or, ios->in_attr, | |
864 | ios->in_attr_len); | |
b14f8ab2 | 865 | } |
06886a5a BH |
866 | |
867 | out: | |
868 | return ret; | |
869 | } | |
870 | ||
8ff660ab | 871 | int ore_write(struct ore_io_state *ios) |
5d952b83 BH |
872 | { |
873 | int i; | |
874 | int ret; | |
875 | ||
876 | ret = _prepare_for_striping(ios); | |
877 | if (unlikely(ret)) | |
878 | return ret; | |
879 | ||
880 | for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { | |
8ff660ab | 881 | ret = _write_mirror(ios, i); |
5d952b83 BH |
882 | if (unlikely(ret)) |
883 | return ret; | |
884 | } | |
885 | ||
8ff660ab | 886 | ret = ore_io_execute(ios); |
5d952b83 BH |
887 | return ret; |
888 | } | |
cf283ade | 889 | EXPORT_SYMBOL(ore_write); |
5d952b83 | 890 | |
8ff660ab | 891 | static int _read_mirror(struct ore_io_state *ios, unsigned cur_comp) |
06886a5a | 892 | { |
46f4d973 | 893 | struct osd_request *or; |
8ff660ab | 894 | struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; |
9e9db456 BH |
895 | struct osd_obj_id *obj = _ios_obj(ios, cur_comp); |
896 | unsigned first_dev = (unsigned)obj->id; | |
06886a5a | 897 | |
50a76fd3 BH |
898 | if (ios->pages && !per_dev->length) |
899 | return 0; /* Just an empty slot */ | |
900 | ||
5d952b83 | 901 | first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1; |
9e9db456 | 902 | or = osd_start_request(_ios_od(ios, first_dev), GFP_KERNEL); |
46f4d973 | 903 | if (unlikely(!or)) { |
8ff660ab | 904 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
46f4d973 BH |
905 | return -ENOMEM; |
906 | } | |
907 | per_dev->or = or; | |
46f4d973 | 908 | |
86093aaf | 909 | if (ios->pages) { |
a1fec1db BH |
910 | if (per_dev->cur_sg) { |
911 | /* finalize the last sg_entry */ | |
912 | _ore_add_sg_seg(per_dev, 0, false); | |
913 | if (unlikely(!per_dev->cur_sg)) | |
914 | return 0; /* Skip parity only device */ | |
915 | ||
916 | osd_req_read_sg(or, obj, per_dev->bio, | |
917 | per_dev->sglist, per_dev->cur_sg); | |
918 | } else { | |
919 | /* The no raid case */ | |
920 | osd_req_read(or, obj, per_dev->offset, | |
921 | per_dev->bio, per_dev->length); | |
922 | } | |
923 | ||
8ff660ab | 924 | ORE_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx" |
a1fec1db | 925 | " dev=%d sg_len=%d\n", _LLU(obj->id), |
5d952b83 | 926 | _LLU(per_dev->offset), _LLU(per_dev->length), |
a1fec1db | 927 | first_dev, per_dev->cur_sg); |
46f4d973 | 928 | } else { |
6851a5e5 BH |
929 | BUG_ON(ios->kern_buff); |
930 | ||
9e9db456 | 931 | osd_req_get_attributes(or, obj); |
8ff660ab | 932 | ORE_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n", |
9e9db456 BH |
933 | _LLU(obj->id), |
934 | ios->in_attr_len, first_dev); | |
46f4d973 | 935 | } |
46f4d973 BH |
936 | if (ios->out_attr) |
937 | osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len); | |
b14f8ab2 | 938 | |
46f4d973 BH |
939 | if (ios->in_attr) |
940 | osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len); | |
b14f8ab2 | 941 | |
5d952b83 BH |
942 | return 0; |
943 | } | |
944 | ||
8ff660ab | 945 | int ore_read(struct ore_io_state *ios) |
5d952b83 BH |
946 | { |
947 | int i; | |
948 | int ret; | |
949 | ||
950 | ret = _prepare_for_striping(ios); | |
951 | if (unlikely(ret)) | |
952 | return ret; | |
953 | ||
954 | for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) { | |
8ff660ab | 955 | ret = _read_mirror(ios, i); |
5d952b83 BH |
956 | if (unlikely(ret)) |
957 | return ret; | |
958 | } | |
959 | ||
8ff660ab | 960 | ret = ore_io_execute(ios); |
5d952b83 | 961 | return ret; |
b14f8ab2 | 962 | } |
cf283ade | 963 | EXPORT_SYMBOL(ore_read); |
b14f8ab2 | 964 | |
8ff660ab | 965 | int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr) |
b14f8ab2 BH |
966 | { |
967 | struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */ | |
968 | void *iter = NULL; | |
969 | int nelem; | |
970 | ||
971 | do { | |
972 | nelem = 1; | |
06886a5a BH |
973 | osd_req_decode_get_attr_list(ios->per_dev[0].or, |
974 | &cur_attr, &nelem, &iter); | |
b14f8ab2 BH |
975 | if ((cur_attr.attr_page == attr->attr_page) && |
976 | (cur_attr.attr_id == attr->attr_id)) { | |
977 | attr->len = cur_attr.len; | |
978 | attr->val_ptr = cur_attr.val_ptr; | |
979 | return 0; | |
980 | } | |
981 | } while (iter); | |
982 | ||
983 | return -EIO; | |
984 | } | |
cf283ade | 985 | EXPORT_SYMBOL(extract_attr_from_ios); |
06886a5a | 986 | |
8ff660ab | 987 | static int _truncate_mirrors(struct ore_io_state *ios, unsigned cur_comp, |
5d952b83 BH |
988 | struct osd_attr *attr) |
989 | { | |
990 | int last_comp = cur_comp + ios->layout->mirrors_p1; | |
991 | ||
992 | for (; cur_comp < last_comp; ++cur_comp) { | |
8ff660ab | 993 | struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp]; |
5d952b83 BH |
994 | struct osd_request *or; |
995 | ||
9e9db456 | 996 | or = osd_start_request(_ios_od(ios, cur_comp), GFP_KERNEL); |
5d952b83 | 997 | if (unlikely(!or)) { |
8ff660ab | 998 | ORE_ERR("%s: osd_start_request failed\n", __func__); |
5d952b83 BH |
999 | return -ENOMEM; |
1000 | } | |
1001 | per_dev->or = or; | |
1002 | ||
9e9db456 | 1003 | osd_req_set_attributes(or, _ios_obj(ios, cur_comp)); |
5d952b83 BH |
1004 | osd_req_add_set_attr_list(or, attr, 1); |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
16f75bb3 | 1010 | struct _trunc_info { |
eb507bc1 | 1011 | struct ore_striping_info si; |
16f75bb3 BH |
1012 | u64 prev_group_obj_off; |
1013 | u64 next_group_obj_off; | |
1014 | ||
1015 | unsigned first_group_dev; | |
1016 | unsigned nex_group_dev; | |
16f75bb3 BH |
1017 | }; |
1018 | ||
1958c7c2 HS |
1019 | static void _calc_trunk_info(struct ore_layout *layout, u64 file_offset, |
1020 | struct _trunc_info *ti) | |
16f75bb3 BH |
1021 | { |
1022 | unsigned stripe_unit = layout->stripe_unit; | |
1023 | ||
a1fec1db | 1024 | ore_calc_stripe_info(layout, file_offset, 0, &ti->si); |
16f75bb3 BH |
1025 | |
1026 | ti->prev_group_obj_off = ti->si.M * stripe_unit; | |
1027 | ti->next_group_obj_off = ti->si.M ? (ti->si.M - 1) * stripe_unit : 0; | |
1028 | ||
1029 | ti->first_group_dev = ti->si.dev - (ti->si.dev % layout->group_width); | |
1030 | ti->nex_group_dev = ti->first_group_dev + layout->group_width; | |
16f75bb3 BH |
1031 | } |
1032 | ||
5bf696da | 1033 | int ore_truncate(struct ore_layout *layout, struct ore_components *oc, |
9e9db456 | 1034 | u64 size) |
06886a5a | 1035 | { |
8ff660ab | 1036 | struct ore_io_state *ios; |
5d952b83 BH |
1037 | struct exofs_trunc_attr { |
1038 | struct osd_attr attr; | |
1039 | __be64 newsize; | |
1040 | } *size_attrs; | |
16f75bb3 | 1041 | struct _trunc_info ti; |
06886a5a BH |
1042 | int i, ret; |
1043 | ||
5bf696da | 1044 | ret = ore_get_io_state(layout, oc, &ios); |
5d952b83 BH |
1045 | if (unlikely(ret)) |
1046 | return ret; | |
1047 | ||
16f75bb3 BH |
1048 | _calc_trunk_info(ios->layout, size, &ti); |
1049 | ||
b916c5cd | 1050 | size_attrs = kcalloc(ios->oc->numdevs, sizeof(*size_attrs), |
5d952b83 BH |
1051 | GFP_KERNEL); |
1052 | if (unlikely(!size_attrs)) { | |
1053 | ret = -ENOMEM; | |
1054 | goto out; | |
1055 | } | |
06886a5a | 1056 | |
5bf696da | 1057 | ios->numdevs = ios->oc->numdevs; |
06886a5a | 1058 | |
b916c5cd | 1059 | for (i = 0; i < ios->numdevs; ++i) { |
5d952b83 BH |
1060 | struct exofs_trunc_attr *size_attr = &size_attrs[i]; |
1061 | u64 obj_size; | |
06886a5a | 1062 | |
16f75bb3 BH |
1063 | if (i < ti.first_group_dev) |
1064 | obj_size = ti.prev_group_obj_off; | |
1065 | else if (i >= ti.nex_group_dev) | |
1066 | obj_size = ti.next_group_obj_off; | |
1067 | else if (i < ti.si.dev) /* dev within this group */ | |
1068 | obj_size = ti.si.obj_offset + | |
1069 | ios->layout->stripe_unit - ti.si.unit_off; | |
1070 | else if (i == ti.si.dev) | |
1071 | obj_size = ti.si.obj_offset; | |
1072 | else /* i > ti.dev */ | |
1073 | obj_size = ti.si.obj_offset - ti.si.unit_off; | |
06886a5a | 1074 | |
5d952b83 BH |
1075 | size_attr->newsize = cpu_to_be64(obj_size); |
1076 | size_attr->attr = g_attr_logical_length; | |
1077 | size_attr->attr.val_ptr = &size_attr->newsize; | |
1078 | ||
8ff660ab | 1079 | ORE_DBGMSG("trunc(0x%llx) obj_offset=0x%llx dev=%d\n", |
5bf696da | 1080 | _LLU(oc->comps->obj.id), _LLU(obj_size), i); |
5d952b83 BH |
1081 | ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1, |
1082 | &size_attr->attr); | |
1083 | if (unlikely(ret)) | |
1084 | goto out; | |
06886a5a | 1085 | } |
8ff660ab | 1086 | ret = ore_io_execute(ios); |
06886a5a BH |
1087 | |
1088 | out: | |
5d952b83 | 1089 | kfree(size_attrs); |
8ff660ab | 1090 | ore_put_io_state(ios); |
06886a5a BH |
1091 | return ret; |
1092 | } | |
cf283ade | 1093 | EXPORT_SYMBOL(ore_truncate); |
85e44df4 BH |
1094 | |
1095 | const struct osd_attr g_attr_logical_length = ATTR_DEF( | |
1096 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
cf283ade | 1097 | EXPORT_SYMBOL(g_attr_logical_length); |