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5212e11f VV |
1 | /* |
2 | * Block Translation Table | |
3 | * Copyright (c) 2014-2015, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | #include <linux/highmem.h> | |
15 | #include <linux/debugfs.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/hdreg.h> | |
21 | #include <linux/genhd.h> | |
22 | #include <linux/sizes.h> | |
23 | #include <linux/ndctl.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/nd.h> | |
26 | #include "btt.h" | |
27 | #include "nd.h" | |
28 | ||
29 | enum log_ent_request { | |
30 | LOG_NEW_ENT = 0, | |
31 | LOG_OLD_ENT | |
32 | }; | |
33 | ||
5212e11f VV |
34 | static int arena_read_bytes(struct arena_info *arena, resource_size_t offset, |
35 | void *buf, size_t n) | |
36 | { | |
37 | struct nd_btt *nd_btt = arena->nd_btt; | |
38 | struct nd_namespace_common *ndns = nd_btt->ndns; | |
39 | ||
40 | /* arena offsets are 4K from the base of the device */ | |
41 | offset += SZ_4K; | |
42 | return nvdimm_read_bytes(ndns, offset, buf, n); | |
43 | } | |
44 | ||
45 | static int arena_write_bytes(struct arena_info *arena, resource_size_t offset, | |
46 | void *buf, size_t n) | |
47 | { | |
48 | struct nd_btt *nd_btt = arena->nd_btt; | |
49 | struct nd_namespace_common *ndns = nd_btt->ndns; | |
50 | ||
51 | /* arena offsets are 4K from the base of the device */ | |
52 | offset += SZ_4K; | |
53 | return nvdimm_write_bytes(ndns, offset, buf, n); | |
54 | } | |
55 | ||
56 | static int btt_info_write(struct arena_info *arena, struct btt_sb *super) | |
57 | { | |
58 | int ret; | |
59 | ||
60 | ret = arena_write_bytes(arena, arena->info2off, super, | |
61 | sizeof(struct btt_sb)); | |
62 | if (ret) | |
63 | return ret; | |
64 | ||
65 | return arena_write_bytes(arena, arena->infooff, super, | |
66 | sizeof(struct btt_sb)); | |
67 | } | |
68 | ||
69 | static int btt_info_read(struct arena_info *arena, struct btt_sb *super) | |
70 | { | |
71 | WARN_ON(!super); | |
72 | return arena_read_bytes(arena, arena->infooff, super, | |
73 | sizeof(struct btt_sb)); | |
74 | } | |
75 | ||
76 | /* | |
77 | * 'raw' version of btt_map write | |
78 | * Assumptions: | |
79 | * mapping is in little-endian | |
80 | * mapping contains 'E' and 'Z' flags as desired | |
81 | */ | |
82 | static int __btt_map_write(struct arena_info *arena, u32 lba, __le32 mapping) | |
83 | { | |
84 | u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); | |
85 | ||
86 | WARN_ON(lba >= arena->external_nlba); | |
87 | return arena_write_bytes(arena, ns_off, &mapping, MAP_ENT_SIZE); | |
88 | } | |
89 | ||
90 | static int btt_map_write(struct arena_info *arena, u32 lba, u32 mapping, | |
91 | u32 z_flag, u32 e_flag) | |
92 | { | |
93 | u32 ze; | |
94 | __le32 mapping_le; | |
95 | ||
96 | /* | |
97 | * This 'mapping' is supposed to be just the LBA mapping, without | |
98 | * any flags set, so strip the flag bits. | |
99 | */ | |
100 | mapping &= MAP_LBA_MASK; | |
101 | ||
102 | ze = (z_flag << 1) + e_flag; | |
103 | switch (ze) { | |
104 | case 0: | |
105 | /* | |
106 | * We want to set neither of the Z or E flags, and | |
107 | * in the actual layout, this means setting the bit | |
108 | * positions of both to '1' to indicate a 'normal' | |
109 | * map entry | |
110 | */ | |
111 | mapping |= MAP_ENT_NORMAL; | |
112 | break; | |
113 | case 1: | |
114 | mapping |= (1 << MAP_ERR_SHIFT); | |
115 | break; | |
116 | case 2: | |
117 | mapping |= (1 << MAP_TRIM_SHIFT); | |
118 | break; | |
119 | default: | |
120 | /* | |
121 | * The case where Z and E are both sent in as '1' could be | |
122 | * construed as a valid 'normal' case, but we decide not to, | |
123 | * to avoid confusion | |
124 | */ | |
125 | WARN_ONCE(1, "Invalid use of Z and E flags\n"); | |
126 | return -EIO; | |
127 | } | |
128 | ||
129 | mapping_le = cpu_to_le32(mapping); | |
130 | return __btt_map_write(arena, lba, mapping_le); | |
131 | } | |
132 | ||
133 | static int btt_map_read(struct arena_info *arena, u32 lba, u32 *mapping, | |
134 | int *trim, int *error) | |
135 | { | |
136 | int ret; | |
137 | __le32 in; | |
138 | u32 raw_mapping, postmap, ze, z_flag, e_flag; | |
139 | u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); | |
140 | ||
141 | WARN_ON(lba >= arena->external_nlba); | |
142 | ||
143 | ret = arena_read_bytes(arena, ns_off, &in, MAP_ENT_SIZE); | |
144 | if (ret) | |
145 | return ret; | |
146 | ||
147 | raw_mapping = le32_to_cpu(in); | |
148 | ||
149 | z_flag = (raw_mapping & MAP_TRIM_MASK) >> MAP_TRIM_SHIFT; | |
150 | e_flag = (raw_mapping & MAP_ERR_MASK) >> MAP_ERR_SHIFT; | |
151 | ze = (z_flag << 1) + e_flag; | |
152 | postmap = raw_mapping & MAP_LBA_MASK; | |
153 | ||
154 | /* Reuse the {z,e}_flag variables for *trim and *error */ | |
155 | z_flag = 0; | |
156 | e_flag = 0; | |
157 | ||
158 | switch (ze) { | |
159 | case 0: | |
160 | /* Initial state. Return postmap = premap */ | |
161 | *mapping = lba; | |
162 | break; | |
163 | case 1: | |
164 | *mapping = postmap; | |
165 | e_flag = 1; | |
166 | break; | |
167 | case 2: | |
168 | *mapping = postmap; | |
169 | z_flag = 1; | |
170 | break; | |
171 | case 3: | |
172 | *mapping = postmap; | |
173 | break; | |
174 | default: | |
175 | return -EIO; | |
176 | } | |
177 | ||
178 | if (trim) | |
179 | *trim = z_flag; | |
180 | if (error) | |
181 | *error = e_flag; | |
182 | ||
183 | return ret; | |
184 | } | |
185 | ||
186 | static int btt_log_read_pair(struct arena_info *arena, u32 lane, | |
187 | struct log_entry *ent) | |
188 | { | |
189 | WARN_ON(!ent); | |
190 | return arena_read_bytes(arena, | |
191 | arena->logoff + (2 * lane * LOG_ENT_SIZE), ent, | |
192 | 2 * LOG_ENT_SIZE); | |
193 | } | |
194 | ||
195 | static struct dentry *debugfs_root; | |
196 | ||
197 | static void arena_debugfs_init(struct arena_info *a, struct dentry *parent, | |
198 | int idx) | |
199 | { | |
200 | char dirname[32]; | |
201 | struct dentry *d; | |
202 | ||
203 | /* If for some reason, parent bttN was not created, exit */ | |
204 | if (!parent) | |
205 | return; | |
206 | ||
207 | snprintf(dirname, 32, "arena%d", idx); | |
208 | d = debugfs_create_dir(dirname, parent); | |
209 | if (IS_ERR_OR_NULL(d)) | |
210 | return; | |
211 | a->debugfs_dir = d; | |
212 | ||
213 | debugfs_create_x64("size", S_IRUGO, d, &a->size); | |
214 | debugfs_create_x64("external_lba_start", S_IRUGO, d, | |
215 | &a->external_lba_start); | |
216 | debugfs_create_x32("internal_nlba", S_IRUGO, d, &a->internal_nlba); | |
217 | debugfs_create_u32("internal_lbasize", S_IRUGO, d, | |
218 | &a->internal_lbasize); | |
219 | debugfs_create_x32("external_nlba", S_IRUGO, d, &a->external_nlba); | |
220 | debugfs_create_u32("external_lbasize", S_IRUGO, d, | |
221 | &a->external_lbasize); | |
222 | debugfs_create_u32("nfree", S_IRUGO, d, &a->nfree); | |
223 | debugfs_create_u16("version_major", S_IRUGO, d, &a->version_major); | |
224 | debugfs_create_u16("version_minor", S_IRUGO, d, &a->version_minor); | |
225 | debugfs_create_x64("nextoff", S_IRUGO, d, &a->nextoff); | |
226 | debugfs_create_x64("infooff", S_IRUGO, d, &a->infooff); | |
227 | debugfs_create_x64("dataoff", S_IRUGO, d, &a->dataoff); | |
228 | debugfs_create_x64("mapoff", S_IRUGO, d, &a->mapoff); | |
229 | debugfs_create_x64("logoff", S_IRUGO, d, &a->logoff); | |
230 | debugfs_create_x64("info2off", S_IRUGO, d, &a->info2off); | |
231 | debugfs_create_x32("flags", S_IRUGO, d, &a->flags); | |
232 | } | |
233 | ||
234 | static void btt_debugfs_init(struct btt *btt) | |
235 | { | |
236 | int i = 0; | |
237 | struct arena_info *arena; | |
238 | ||
239 | btt->debugfs_dir = debugfs_create_dir(dev_name(&btt->nd_btt->dev), | |
240 | debugfs_root); | |
241 | if (IS_ERR_OR_NULL(btt->debugfs_dir)) | |
242 | return; | |
243 | ||
244 | list_for_each_entry(arena, &btt->arena_list, list) { | |
245 | arena_debugfs_init(arena, btt->debugfs_dir, i); | |
246 | i++; | |
247 | } | |
248 | } | |
249 | ||
250 | /* | |
251 | * This function accepts two log entries, and uses the | |
252 | * sequence number to find the 'older' entry. | |
253 | * It also updates the sequence number in this old entry to | |
254 | * make it the 'new' one if the mark_flag is set. | |
255 | * Finally, it returns which of the entries was the older one. | |
256 | * | |
257 | * TODO The logic feels a bit kludge-y. make it better.. | |
258 | */ | |
259 | static int btt_log_get_old(struct log_entry *ent) | |
260 | { | |
261 | int old; | |
262 | ||
263 | /* | |
264 | * the first ever time this is seen, the entry goes into [0] | |
265 | * the next time, the following logic works out to put this | |
266 | * (next) entry into [1] | |
267 | */ | |
268 | if (ent[0].seq == 0) { | |
269 | ent[0].seq = cpu_to_le32(1); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | if (ent[0].seq == ent[1].seq) | |
274 | return -EINVAL; | |
275 | if (le32_to_cpu(ent[0].seq) + le32_to_cpu(ent[1].seq) > 5) | |
276 | return -EINVAL; | |
277 | ||
278 | if (le32_to_cpu(ent[0].seq) < le32_to_cpu(ent[1].seq)) { | |
279 | if (le32_to_cpu(ent[1].seq) - le32_to_cpu(ent[0].seq) == 1) | |
280 | old = 0; | |
281 | else | |
282 | old = 1; | |
283 | } else { | |
284 | if (le32_to_cpu(ent[0].seq) - le32_to_cpu(ent[1].seq) == 1) | |
285 | old = 1; | |
286 | else | |
287 | old = 0; | |
288 | } | |
289 | ||
290 | return old; | |
291 | } | |
292 | ||
293 | static struct device *to_dev(struct arena_info *arena) | |
294 | { | |
295 | return &arena->nd_btt->dev; | |
296 | } | |
297 | ||
298 | /* | |
299 | * This function copies the desired (old/new) log entry into ent if | |
300 | * it is not NULL. It returns the sub-slot number (0 or 1) | |
301 | * where the desired log entry was found. Negative return values | |
302 | * indicate errors. | |
303 | */ | |
304 | static int btt_log_read(struct arena_info *arena, u32 lane, | |
305 | struct log_entry *ent, int old_flag) | |
306 | { | |
307 | int ret; | |
308 | int old_ent, ret_ent; | |
309 | struct log_entry log[2]; | |
310 | ||
311 | ret = btt_log_read_pair(arena, lane, log); | |
312 | if (ret) | |
313 | return -EIO; | |
314 | ||
315 | old_ent = btt_log_get_old(log); | |
316 | if (old_ent < 0 || old_ent > 1) { | |
317 | dev_info(to_dev(arena), | |
318 | "log corruption (%d): lane %d seq [%d, %d]\n", | |
319 | old_ent, lane, log[0].seq, log[1].seq); | |
320 | /* TODO set error state? */ | |
321 | return -EIO; | |
322 | } | |
323 | ||
324 | ret_ent = (old_flag ? old_ent : (1 - old_ent)); | |
325 | ||
326 | if (ent != NULL) | |
327 | memcpy(ent, &log[ret_ent], LOG_ENT_SIZE); | |
328 | ||
329 | return ret_ent; | |
330 | } | |
331 | ||
332 | /* | |
333 | * This function commits a log entry to media | |
334 | * It does _not_ prepare the freelist entry for the next write | |
335 | * btt_flog_write is the wrapper for updating the freelist elements | |
336 | */ | |
337 | static int __btt_log_write(struct arena_info *arena, u32 lane, | |
338 | u32 sub, struct log_entry *ent) | |
339 | { | |
340 | int ret; | |
341 | /* | |
342 | * Ignore the padding in log_entry for calculating log_half. | |
343 | * The entry is 'committed' when we write the sequence number, | |
344 | * and we want to ensure that that is the last thing written. | |
345 | * We don't bother writing the padding as that would be extra | |
346 | * media wear and write amplification | |
347 | */ | |
348 | unsigned int log_half = (LOG_ENT_SIZE - 2 * sizeof(u64)) / 2; | |
349 | u64 ns_off = arena->logoff + (((2 * lane) + sub) * LOG_ENT_SIZE); | |
350 | void *src = ent; | |
351 | ||
352 | /* split the 16B write into atomic, durable halves */ | |
353 | ret = arena_write_bytes(arena, ns_off, src, log_half); | |
354 | if (ret) | |
355 | return ret; | |
356 | ||
357 | ns_off += log_half; | |
358 | src += log_half; | |
359 | return arena_write_bytes(arena, ns_off, src, log_half); | |
360 | } | |
361 | ||
362 | static int btt_flog_write(struct arena_info *arena, u32 lane, u32 sub, | |
363 | struct log_entry *ent) | |
364 | { | |
365 | int ret; | |
366 | ||
367 | ret = __btt_log_write(arena, lane, sub, ent); | |
368 | if (ret) | |
369 | return ret; | |
370 | ||
371 | /* prepare the next free entry */ | |
372 | arena->freelist[lane].sub = 1 - arena->freelist[lane].sub; | |
373 | if (++(arena->freelist[lane].seq) == 4) | |
374 | arena->freelist[lane].seq = 1; | |
375 | arena->freelist[lane].block = le32_to_cpu(ent->old_map); | |
376 | ||
377 | return ret; | |
378 | } | |
379 | ||
380 | /* | |
381 | * This function initializes the BTT map to the initial state, which is | |
382 | * all-zeroes, and indicates an identity mapping | |
383 | */ | |
384 | static int btt_map_init(struct arena_info *arena) | |
385 | { | |
386 | int ret = -EINVAL; | |
387 | void *zerobuf; | |
388 | size_t offset = 0; | |
389 | size_t chunk_size = SZ_2M; | |
390 | size_t mapsize = arena->logoff - arena->mapoff; | |
391 | ||
392 | zerobuf = kzalloc(chunk_size, GFP_KERNEL); | |
393 | if (!zerobuf) | |
394 | return -ENOMEM; | |
395 | ||
396 | while (mapsize) { | |
397 | size_t size = min(mapsize, chunk_size); | |
398 | ||
399 | ret = arena_write_bytes(arena, arena->mapoff + offset, zerobuf, | |
400 | size); | |
401 | if (ret) | |
402 | goto free; | |
403 | ||
404 | offset += size; | |
405 | mapsize -= size; | |
406 | cond_resched(); | |
407 | } | |
408 | ||
409 | free: | |
410 | kfree(zerobuf); | |
411 | return ret; | |
412 | } | |
413 | ||
414 | /* | |
415 | * This function initializes the BTT log with 'fake' entries pointing | |
416 | * to the initial reserved set of blocks as being free | |
417 | */ | |
418 | static int btt_log_init(struct arena_info *arena) | |
419 | { | |
420 | int ret; | |
421 | u32 i; | |
422 | struct log_entry log, zerolog; | |
423 | ||
424 | memset(&zerolog, 0, sizeof(zerolog)); | |
425 | ||
426 | for (i = 0; i < arena->nfree; i++) { | |
427 | log.lba = cpu_to_le32(i); | |
428 | log.old_map = cpu_to_le32(arena->external_nlba + i); | |
429 | log.new_map = cpu_to_le32(arena->external_nlba + i); | |
430 | log.seq = cpu_to_le32(LOG_SEQ_INIT); | |
431 | ret = __btt_log_write(arena, i, 0, &log); | |
432 | if (ret) | |
433 | return ret; | |
434 | ret = __btt_log_write(arena, i, 1, &zerolog); | |
435 | if (ret) | |
436 | return ret; | |
437 | } | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | static int btt_freelist_init(struct arena_info *arena) | |
443 | { | |
444 | int old, new, ret; | |
445 | u32 i, map_entry; | |
446 | struct log_entry log_new, log_old; | |
447 | ||
448 | arena->freelist = kcalloc(arena->nfree, sizeof(struct free_entry), | |
449 | GFP_KERNEL); | |
450 | if (!arena->freelist) | |
451 | return -ENOMEM; | |
452 | ||
453 | for (i = 0; i < arena->nfree; i++) { | |
454 | old = btt_log_read(arena, i, &log_old, LOG_OLD_ENT); | |
455 | if (old < 0) | |
456 | return old; | |
457 | ||
458 | new = btt_log_read(arena, i, &log_new, LOG_NEW_ENT); | |
459 | if (new < 0) | |
460 | return new; | |
461 | ||
462 | /* sub points to the next one to be overwritten */ | |
463 | arena->freelist[i].sub = 1 - new; | |
464 | arena->freelist[i].seq = nd_inc_seq(le32_to_cpu(log_new.seq)); | |
465 | arena->freelist[i].block = le32_to_cpu(log_new.old_map); | |
466 | ||
467 | /* This implies a newly created or untouched flog entry */ | |
468 | if (log_new.old_map == log_new.new_map) | |
469 | continue; | |
470 | ||
471 | /* Check if map recovery is needed */ | |
472 | ret = btt_map_read(arena, le32_to_cpu(log_new.lba), &map_entry, | |
473 | NULL, NULL); | |
474 | if (ret) | |
475 | return ret; | |
476 | if ((le32_to_cpu(log_new.new_map) != map_entry) && | |
477 | (le32_to_cpu(log_new.old_map) == map_entry)) { | |
478 | /* | |
479 | * Last transaction wrote the flog, but wasn't able | |
480 | * to complete the map write. So fix up the map. | |
481 | */ | |
482 | ret = btt_map_write(arena, le32_to_cpu(log_new.lba), | |
483 | le32_to_cpu(log_new.new_map), 0, 0); | |
484 | if (ret) | |
485 | return ret; | |
486 | } | |
487 | ||
488 | } | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | static int btt_rtt_init(struct arena_info *arena) | |
494 | { | |
495 | arena->rtt = kcalloc(arena->nfree, sizeof(u32), GFP_KERNEL); | |
496 | if (arena->rtt == NULL) | |
497 | return -ENOMEM; | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static int btt_maplocks_init(struct arena_info *arena) | |
503 | { | |
504 | u32 i; | |
505 | ||
506 | arena->map_locks = kcalloc(arena->nfree, sizeof(struct aligned_lock), | |
507 | GFP_KERNEL); | |
508 | if (!arena->map_locks) | |
509 | return -ENOMEM; | |
510 | ||
511 | for (i = 0; i < arena->nfree; i++) | |
512 | spin_lock_init(&arena->map_locks[i].lock); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | static struct arena_info *alloc_arena(struct btt *btt, size_t size, | |
518 | size_t start, size_t arena_off) | |
519 | { | |
520 | struct arena_info *arena; | |
521 | u64 logsize, mapsize, datasize; | |
522 | u64 available = size; | |
523 | ||
524 | arena = kzalloc(sizeof(struct arena_info), GFP_KERNEL); | |
525 | if (!arena) | |
526 | return NULL; | |
527 | arena->nd_btt = btt->nd_btt; | |
528 | ||
529 | if (!size) | |
530 | return arena; | |
531 | ||
532 | arena->size = size; | |
533 | arena->external_lba_start = start; | |
534 | arena->external_lbasize = btt->lbasize; | |
535 | arena->internal_lbasize = roundup(arena->external_lbasize, | |
536 | INT_LBASIZE_ALIGNMENT); | |
537 | arena->nfree = BTT_DEFAULT_NFREE; | |
538 | arena->version_major = 1; | |
539 | arena->version_minor = 1; | |
540 | ||
541 | if (available % BTT_PG_SIZE) | |
542 | available -= (available % BTT_PG_SIZE); | |
543 | ||
544 | /* Two pages are reserved for the super block and its copy */ | |
545 | available -= 2 * BTT_PG_SIZE; | |
546 | ||
547 | /* The log takes a fixed amount of space based on nfree */ | |
548 | logsize = roundup(2 * arena->nfree * sizeof(struct log_entry), | |
549 | BTT_PG_SIZE); | |
550 | available -= logsize; | |
551 | ||
552 | /* Calculate optimal split between map and data area */ | |
553 | arena->internal_nlba = div_u64(available - BTT_PG_SIZE, | |
554 | arena->internal_lbasize + MAP_ENT_SIZE); | |
555 | arena->external_nlba = arena->internal_nlba - arena->nfree; | |
556 | ||
557 | mapsize = roundup((arena->external_nlba * MAP_ENT_SIZE), BTT_PG_SIZE); | |
558 | datasize = available - mapsize; | |
559 | ||
560 | /* 'Absolute' values, relative to start of storage space */ | |
561 | arena->infooff = arena_off; | |
562 | arena->dataoff = arena->infooff + BTT_PG_SIZE; | |
563 | arena->mapoff = arena->dataoff + datasize; | |
564 | arena->logoff = arena->mapoff + mapsize; | |
565 | arena->info2off = arena->logoff + logsize; | |
566 | return arena; | |
567 | } | |
568 | ||
569 | static void free_arenas(struct btt *btt) | |
570 | { | |
571 | struct arena_info *arena, *next; | |
572 | ||
573 | list_for_each_entry_safe(arena, next, &btt->arena_list, list) { | |
574 | list_del(&arena->list); | |
575 | kfree(arena->rtt); | |
576 | kfree(arena->map_locks); | |
577 | kfree(arena->freelist); | |
578 | debugfs_remove_recursive(arena->debugfs_dir); | |
579 | kfree(arena); | |
580 | } | |
581 | } | |
582 | ||
5212e11f VV |
583 | /* |
584 | * This function reads an existing valid btt superblock and | |
585 | * populates the corresponding arena_info struct | |
586 | */ | |
587 | static void parse_arena_meta(struct arena_info *arena, struct btt_sb *super, | |
588 | u64 arena_off) | |
589 | { | |
590 | arena->internal_nlba = le32_to_cpu(super->internal_nlba); | |
591 | arena->internal_lbasize = le32_to_cpu(super->internal_lbasize); | |
592 | arena->external_nlba = le32_to_cpu(super->external_nlba); | |
593 | arena->external_lbasize = le32_to_cpu(super->external_lbasize); | |
594 | arena->nfree = le32_to_cpu(super->nfree); | |
595 | arena->version_major = le16_to_cpu(super->version_major); | |
596 | arena->version_minor = le16_to_cpu(super->version_minor); | |
597 | ||
598 | arena->nextoff = (super->nextoff == 0) ? 0 : (arena_off + | |
599 | le64_to_cpu(super->nextoff)); | |
600 | arena->infooff = arena_off; | |
601 | arena->dataoff = arena_off + le64_to_cpu(super->dataoff); | |
602 | arena->mapoff = arena_off + le64_to_cpu(super->mapoff); | |
603 | arena->logoff = arena_off + le64_to_cpu(super->logoff); | |
604 | arena->info2off = arena_off + le64_to_cpu(super->info2off); | |
605 | ||
5e329406 DW |
606 | arena->size = (le64_to_cpu(super->nextoff) > 0) |
607 | ? (le64_to_cpu(super->nextoff)) | |
608 | : (arena->info2off - arena->infooff + BTT_PG_SIZE); | |
5212e11f VV |
609 | |
610 | arena->flags = le32_to_cpu(super->flags); | |
611 | } | |
612 | ||
613 | static int discover_arenas(struct btt *btt) | |
614 | { | |
615 | int ret = 0; | |
616 | struct arena_info *arena; | |
617 | struct btt_sb *super; | |
618 | size_t remaining = btt->rawsize; | |
619 | u64 cur_nlba = 0; | |
620 | size_t cur_off = 0; | |
621 | int num_arenas = 0; | |
622 | ||
623 | super = kzalloc(sizeof(*super), GFP_KERNEL); | |
624 | if (!super) | |
625 | return -ENOMEM; | |
626 | ||
627 | while (remaining) { | |
628 | /* Alloc memory for arena */ | |
629 | arena = alloc_arena(btt, 0, 0, 0); | |
630 | if (!arena) { | |
631 | ret = -ENOMEM; | |
632 | goto out_super; | |
633 | } | |
634 | ||
635 | arena->infooff = cur_off; | |
636 | ret = btt_info_read(arena, super); | |
637 | if (ret) | |
638 | goto out; | |
639 | ||
ab45e763 | 640 | if (!nd_btt_arena_is_valid(btt->nd_btt, super)) { |
5212e11f VV |
641 | if (remaining == btt->rawsize) { |
642 | btt->init_state = INIT_NOTFOUND; | |
643 | dev_info(to_dev(arena), "No existing arenas\n"); | |
644 | goto out; | |
645 | } else { | |
646 | dev_info(to_dev(arena), | |
647 | "Found corrupted metadata!\n"); | |
648 | ret = -ENODEV; | |
649 | goto out; | |
650 | } | |
651 | } | |
652 | ||
653 | arena->external_lba_start = cur_nlba; | |
654 | parse_arena_meta(arena, super, cur_off); | |
655 | ||
656 | ret = btt_freelist_init(arena); | |
657 | if (ret) | |
658 | goto out; | |
659 | ||
660 | ret = btt_rtt_init(arena); | |
661 | if (ret) | |
662 | goto out; | |
663 | ||
664 | ret = btt_maplocks_init(arena); | |
665 | if (ret) | |
666 | goto out; | |
667 | ||
668 | list_add_tail(&arena->list, &btt->arena_list); | |
669 | ||
670 | remaining -= arena->size; | |
671 | cur_off += arena->size; | |
672 | cur_nlba += arena->external_nlba; | |
673 | num_arenas++; | |
674 | ||
675 | if (arena->nextoff == 0) | |
676 | break; | |
677 | } | |
678 | btt->num_arenas = num_arenas; | |
679 | btt->nlba = cur_nlba; | |
680 | btt->init_state = INIT_READY; | |
681 | ||
682 | kfree(super); | |
683 | return ret; | |
684 | ||
685 | out: | |
686 | kfree(arena); | |
687 | free_arenas(btt); | |
688 | out_super: | |
689 | kfree(super); | |
690 | return ret; | |
691 | } | |
692 | ||
693 | static int create_arenas(struct btt *btt) | |
694 | { | |
695 | size_t remaining = btt->rawsize; | |
696 | size_t cur_off = 0; | |
697 | ||
698 | while (remaining) { | |
699 | struct arena_info *arena; | |
700 | size_t arena_size = min_t(u64, ARENA_MAX_SIZE, remaining); | |
701 | ||
702 | remaining -= arena_size; | |
703 | if (arena_size < ARENA_MIN_SIZE) | |
704 | break; | |
705 | ||
706 | arena = alloc_arena(btt, arena_size, btt->nlba, cur_off); | |
707 | if (!arena) { | |
708 | free_arenas(btt); | |
709 | return -ENOMEM; | |
710 | } | |
711 | btt->nlba += arena->external_nlba; | |
712 | if (remaining >= ARENA_MIN_SIZE) | |
713 | arena->nextoff = arena->size; | |
714 | else | |
715 | arena->nextoff = 0; | |
716 | cur_off += arena_size; | |
717 | list_add_tail(&arena->list, &btt->arena_list); | |
718 | } | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
723 | /* | |
724 | * This function completes arena initialization by writing | |
725 | * all the metadata. | |
726 | * It is only called for an uninitialized arena when a write | |
727 | * to that arena occurs for the first time. | |
728 | */ | |
fbde1414 | 729 | static int btt_arena_write_layout(struct arena_info *arena) |
5212e11f VV |
730 | { |
731 | int ret; | |
e1455744 | 732 | u64 sum; |
5212e11f | 733 | struct btt_sb *super; |
fbde1414 | 734 | struct nd_btt *nd_btt = arena->nd_btt; |
6ec68954 | 735 | const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); |
5212e11f VV |
736 | |
737 | ret = btt_map_init(arena); | |
738 | if (ret) | |
739 | return ret; | |
740 | ||
741 | ret = btt_log_init(arena); | |
742 | if (ret) | |
743 | return ret; | |
744 | ||
745 | super = kzalloc(sizeof(struct btt_sb), GFP_NOIO); | |
746 | if (!super) | |
747 | return -ENOMEM; | |
748 | ||
749 | strncpy(super->signature, BTT_SIG, BTT_SIG_LEN); | |
fbde1414 | 750 | memcpy(super->uuid, nd_btt->uuid, 16); |
6ec68954 | 751 | memcpy(super->parent_uuid, parent_uuid, 16); |
5212e11f VV |
752 | super->flags = cpu_to_le32(arena->flags); |
753 | super->version_major = cpu_to_le16(arena->version_major); | |
754 | super->version_minor = cpu_to_le16(arena->version_minor); | |
755 | super->external_lbasize = cpu_to_le32(arena->external_lbasize); | |
756 | super->external_nlba = cpu_to_le32(arena->external_nlba); | |
757 | super->internal_lbasize = cpu_to_le32(arena->internal_lbasize); | |
758 | super->internal_nlba = cpu_to_le32(arena->internal_nlba); | |
759 | super->nfree = cpu_to_le32(arena->nfree); | |
760 | super->infosize = cpu_to_le32(sizeof(struct btt_sb)); | |
761 | super->nextoff = cpu_to_le64(arena->nextoff); | |
762 | /* | |
763 | * Subtract arena->infooff (arena start) so numbers are relative | |
764 | * to 'this' arena | |
765 | */ | |
766 | super->dataoff = cpu_to_le64(arena->dataoff - arena->infooff); | |
767 | super->mapoff = cpu_to_le64(arena->mapoff - arena->infooff); | |
768 | super->logoff = cpu_to_le64(arena->logoff - arena->infooff); | |
769 | super->info2off = cpu_to_le64(arena->info2off - arena->infooff); | |
770 | ||
771 | super->flags = 0; | |
e1455744 DW |
772 | sum = nd_sb_checksum((struct nd_gen_sb *) super); |
773 | super->checksum = cpu_to_le64(sum); | |
5212e11f VV |
774 | |
775 | ret = btt_info_write(arena, super); | |
776 | ||
777 | kfree(super); | |
778 | return ret; | |
779 | } | |
780 | ||
781 | /* | |
782 | * This function completes the initialization for the BTT namespace | |
783 | * such that it is ready to accept IOs | |
784 | */ | |
785 | static int btt_meta_init(struct btt *btt) | |
786 | { | |
787 | int ret = 0; | |
788 | struct arena_info *arena; | |
789 | ||
790 | mutex_lock(&btt->init_lock); | |
791 | list_for_each_entry(arena, &btt->arena_list, list) { | |
fbde1414 | 792 | ret = btt_arena_write_layout(arena); |
5212e11f VV |
793 | if (ret) |
794 | goto unlock; | |
795 | ||
796 | ret = btt_freelist_init(arena); | |
797 | if (ret) | |
798 | goto unlock; | |
799 | ||
800 | ret = btt_rtt_init(arena); | |
801 | if (ret) | |
802 | goto unlock; | |
803 | ||
804 | ret = btt_maplocks_init(arena); | |
805 | if (ret) | |
806 | goto unlock; | |
807 | } | |
808 | ||
809 | btt->init_state = INIT_READY; | |
810 | ||
811 | unlock: | |
812 | mutex_unlock(&btt->init_lock); | |
813 | return ret; | |
814 | } | |
815 | ||
41cd8b70 VV |
816 | static u32 btt_meta_size(struct btt *btt) |
817 | { | |
818 | return btt->lbasize - btt->sector_size; | |
819 | } | |
820 | ||
5212e11f VV |
821 | /* |
822 | * This function calculates the arena in which the given LBA lies | |
823 | * by doing a linear walk. This is acceptable since we expect only | |
824 | * a few arenas. If we have backing devices that get much larger, | |
825 | * we can construct a balanced binary tree of arenas at init time | |
826 | * so that this range search becomes faster. | |
827 | */ | |
828 | static int lba_to_arena(struct btt *btt, sector_t sector, __u32 *premap, | |
829 | struct arena_info **arena) | |
830 | { | |
831 | struct arena_info *arena_list; | |
832 | __u64 lba = div_u64(sector << SECTOR_SHIFT, btt->sector_size); | |
833 | ||
834 | list_for_each_entry(arena_list, &btt->arena_list, list) { | |
835 | if (lba < arena_list->external_nlba) { | |
836 | *arena = arena_list; | |
837 | *premap = lba; | |
838 | return 0; | |
839 | } | |
840 | lba -= arena_list->external_nlba; | |
841 | } | |
842 | ||
843 | return -EIO; | |
844 | } | |
845 | ||
846 | /* | |
847 | * The following (lock_map, unlock_map) are mostly just to improve | |
848 | * readability, since they index into an array of locks | |
849 | */ | |
850 | static void lock_map(struct arena_info *arena, u32 premap) | |
851 | __acquires(&arena->map_locks[idx].lock) | |
852 | { | |
853 | u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; | |
854 | ||
855 | spin_lock(&arena->map_locks[idx].lock); | |
856 | } | |
857 | ||
858 | static void unlock_map(struct arena_info *arena, u32 premap) | |
859 | __releases(&arena->map_locks[idx].lock) | |
860 | { | |
861 | u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; | |
862 | ||
863 | spin_unlock(&arena->map_locks[idx].lock); | |
864 | } | |
865 | ||
866 | static u64 to_namespace_offset(struct arena_info *arena, u64 lba) | |
867 | { | |
868 | return arena->dataoff + ((u64)lba * arena->internal_lbasize); | |
869 | } | |
870 | ||
871 | static int btt_data_read(struct arena_info *arena, struct page *page, | |
872 | unsigned int off, u32 lba, u32 len) | |
873 | { | |
874 | int ret; | |
875 | u64 nsoff = to_namespace_offset(arena, lba); | |
876 | void *mem = kmap_atomic(page); | |
877 | ||
878 | ret = arena_read_bytes(arena, nsoff, mem + off, len); | |
879 | kunmap_atomic(mem); | |
880 | ||
881 | return ret; | |
882 | } | |
883 | ||
884 | static int btt_data_write(struct arena_info *arena, u32 lba, | |
885 | struct page *page, unsigned int off, u32 len) | |
886 | { | |
887 | int ret; | |
888 | u64 nsoff = to_namespace_offset(arena, lba); | |
889 | void *mem = kmap_atomic(page); | |
890 | ||
891 | ret = arena_write_bytes(arena, nsoff, mem + off, len); | |
892 | kunmap_atomic(mem); | |
893 | ||
894 | return ret; | |
895 | } | |
896 | ||
897 | static void zero_fill_data(struct page *page, unsigned int off, u32 len) | |
898 | { | |
899 | void *mem = kmap_atomic(page); | |
900 | ||
901 | memset(mem + off, 0, len); | |
902 | kunmap_atomic(mem); | |
903 | } | |
904 | ||
41cd8b70 VV |
905 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
906 | static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, | |
907 | struct arena_info *arena, u32 postmap, int rw) | |
908 | { | |
909 | unsigned int len = btt_meta_size(btt); | |
910 | u64 meta_nsoff; | |
911 | int ret = 0; | |
912 | ||
913 | if (bip == NULL) | |
914 | return 0; | |
915 | ||
916 | meta_nsoff = to_namespace_offset(arena, postmap) + btt->sector_size; | |
917 | ||
918 | while (len) { | |
919 | unsigned int cur_len; | |
920 | struct bio_vec bv; | |
921 | void *mem; | |
922 | ||
923 | bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter); | |
924 | /* | |
925 | * The 'bv' obtained from bvec_iter_bvec has its .bv_len and | |
926 | * .bv_offset already adjusted for iter->bi_bvec_done, and we | |
927 | * can use those directly | |
928 | */ | |
929 | ||
930 | cur_len = min(len, bv.bv_len); | |
931 | mem = kmap_atomic(bv.bv_page); | |
932 | if (rw) | |
933 | ret = arena_write_bytes(arena, meta_nsoff, | |
934 | mem + bv.bv_offset, cur_len); | |
935 | else | |
936 | ret = arena_read_bytes(arena, meta_nsoff, | |
937 | mem + bv.bv_offset, cur_len); | |
938 | ||
939 | kunmap_atomic(mem); | |
940 | if (ret) | |
941 | return ret; | |
942 | ||
943 | len -= cur_len; | |
944 | meta_nsoff += cur_len; | |
945 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len); | |
946 | } | |
947 | ||
948 | return ret; | |
949 | } | |
950 | ||
951 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
952 | static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, | |
953 | struct arena_info *arena, u32 postmap, int rw) | |
954 | { | |
955 | return 0; | |
956 | } | |
957 | #endif | |
958 | ||
959 | static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip, | |
960 | struct page *page, unsigned int off, sector_t sector, | |
961 | unsigned int len) | |
5212e11f VV |
962 | { |
963 | int ret = 0; | |
964 | int t_flag, e_flag; | |
965 | struct arena_info *arena = NULL; | |
966 | u32 lane = 0, premap, postmap; | |
967 | ||
968 | while (len) { | |
969 | u32 cur_len; | |
970 | ||
971 | lane = nd_region_acquire_lane(btt->nd_region); | |
972 | ||
973 | ret = lba_to_arena(btt, sector, &premap, &arena); | |
974 | if (ret) | |
975 | goto out_lane; | |
976 | ||
977 | cur_len = min(btt->sector_size, len); | |
978 | ||
979 | ret = btt_map_read(arena, premap, &postmap, &t_flag, &e_flag); | |
980 | if (ret) | |
981 | goto out_lane; | |
982 | ||
983 | /* | |
984 | * We loop to make sure that the post map LBA didn't change | |
985 | * from under us between writing the RTT and doing the actual | |
986 | * read. | |
987 | */ | |
988 | while (1) { | |
989 | u32 new_map; | |
990 | ||
991 | if (t_flag) { | |
992 | zero_fill_data(page, off, cur_len); | |
993 | goto out_lane; | |
994 | } | |
995 | ||
996 | if (e_flag) { | |
997 | ret = -EIO; | |
998 | goto out_lane; | |
999 | } | |
1000 | ||
1001 | arena->rtt[lane] = RTT_VALID | postmap; | |
1002 | /* | |
1003 | * Barrier to make sure this write is not reordered | |
1004 | * to do the verification map_read before the RTT store | |
1005 | */ | |
1006 | barrier(); | |
1007 | ||
1008 | ret = btt_map_read(arena, premap, &new_map, &t_flag, | |
1009 | &e_flag); | |
1010 | if (ret) | |
1011 | goto out_rtt; | |
1012 | ||
1013 | if (postmap == new_map) | |
1014 | break; | |
1015 | ||
1016 | postmap = new_map; | |
1017 | } | |
1018 | ||
1019 | ret = btt_data_read(arena, page, off, postmap, cur_len); | |
1020 | if (ret) | |
1021 | goto out_rtt; | |
1022 | ||
41cd8b70 VV |
1023 | if (bip) { |
1024 | ret = btt_rw_integrity(btt, bip, arena, postmap, READ); | |
1025 | if (ret) | |
1026 | goto out_rtt; | |
1027 | } | |
1028 | ||
5212e11f VV |
1029 | arena->rtt[lane] = RTT_INVALID; |
1030 | nd_region_release_lane(btt->nd_region, lane); | |
1031 | ||
1032 | len -= cur_len; | |
1033 | off += cur_len; | |
1034 | sector += btt->sector_size >> SECTOR_SHIFT; | |
1035 | } | |
1036 | ||
1037 | return 0; | |
1038 | ||
1039 | out_rtt: | |
1040 | arena->rtt[lane] = RTT_INVALID; | |
1041 | out_lane: | |
1042 | nd_region_release_lane(btt->nd_region, lane); | |
1043 | return ret; | |
1044 | } | |
1045 | ||
41cd8b70 VV |
1046 | static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip, |
1047 | sector_t sector, struct page *page, unsigned int off, | |
1048 | unsigned int len) | |
5212e11f VV |
1049 | { |
1050 | int ret = 0; | |
1051 | struct arena_info *arena = NULL; | |
1052 | u32 premap = 0, old_postmap, new_postmap, lane = 0, i; | |
1053 | struct log_entry log; | |
1054 | int sub; | |
1055 | ||
1056 | while (len) { | |
1057 | u32 cur_len; | |
1058 | ||
1059 | lane = nd_region_acquire_lane(btt->nd_region); | |
1060 | ||
1061 | ret = lba_to_arena(btt, sector, &premap, &arena); | |
1062 | if (ret) | |
1063 | goto out_lane; | |
1064 | cur_len = min(btt->sector_size, len); | |
1065 | ||
1066 | if ((arena->flags & IB_FLAG_ERROR_MASK) != 0) { | |
1067 | ret = -EIO; | |
1068 | goto out_lane; | |
1069 | } | |
1070 | ||
1071 | new_postmap = arena->freelist[lane].block; | |
1072 | ||
1073 | /* Wait if the new block is being read from */ | |
1074 | for (i = 0; i < arena->nfree; i++) | |
1075 | while (arena->rtt[i] == (RTT_VALID | new_postmap)) | |
1076 | cpu_relax(); | |
1077 | ||
1078 | ||
1079 | if (new_postmap >= arena->internal_nlba) { | |
1080 | ret = -EIO; | |
1081 | goto out_lane; | |
41cd8b70 VV |
1082 | } |
1083 | ||
1084 | ret = btt_data_write(arena, new_postmap, page, off, cur_len); | |
5212e11f VV |
1085 | if (ret) |
1086 | goto out_lane; | |
1087 | ||
41cd8b70 VV |
1088 | if (bip) { |
1089 | ret = btt_rw_integrity(btt, bip, arena, new_postmap, | |
1090 | WRITE); | |
1091 | if (ret) | |
1092 | goto out_lane; | |
1093 | } | |
1094 | ||
5212e11f VV |
1095 | lock_map(arena, premap); |
1096 | ret = btt_map_read(arena, premap, &old_postmap, NULL, NULL); | |
1097 | if (ret) | |
1098 | goto out_map; | |
1099 | if (old_postmap >= arena->internal_nlba) { | |
1100 | ret = -EIO; | |
1101 | goto out_map; | |
1102 | } | |
1103 | ||
1104 | log.lba = cpu_to_le32(premap); | |
1105 | log.old_map = cpu_to_le32(old_postmap); | |
1106 | log.new_map = cpu_to_le32(new_postmap); | |
1107 | log.seq = cpu_to_le32(arena->freelist[lane].seq); | |
1108 | sub = arena->freelist[lane].sub; | |
1109 | ret = btt_flog_write(arena, lane, sub, &log); | |
1110 | if (ret) | |
1111 | goto out_map; | |
1112 | ||
1113 | ret = btt_map_write(arena, premap, new_postmap, 0, 0); | |
1114 | if (ret) | |
1115 | goto out_map; | |
1116 | ||
1117 | unlock_map(arena, premap); | |
1118 | nd_region_release_lane(btt->nd_region, lane); | |
1119 | ||
1120 | len -= cur_len; | |
1121 | off += cur_len; | |
1122 | sector += btt->sector_size >> SECTOR_SHIFT; | |
1123 | } | |
1124 | ||
1125 | return 0; | |
1126 | ||
1127 | out_map: | |
1128 | unlock_map(arena, premap); | |
1129 | out_lane: | |
1130 | nd_region_release_lane(btt->nd_region, lane); | |
1131 | return ret; | |
1132 | } | |
1133 | ||
41cd8b70 VV |
1134 | static int btt_do_bvec(struct btt *btt, struct bio_integrity_payload *bip, |
1135 | struct page *page, unsigned int len, unsigned int off, | |
1136 | int rw, sector_t sector) | |
5212e11f VV |
1137 | { |
1138 | int ret; | |
1139 | ||
1140 | if (rw == READ) { | |
41cd8b70 | 1141 | ret = btt_read_pg(btt, bip, page, off, sector, len); |
5212e11f VV |
1142 | flush_dcache_page(page); |
1143 | } else { | |
1144 | flush_dcache_page(page); | |
41cd8b70 | 1145 | ret = btt_write_pg(btt, bip, sector, page, off, len); |
5212e11f VV |
1146 | } |
1147 | ||
1148 | return ret; | |
1149 | } | |
1150 | ||
dece1635 | 1151 | static blk_qc_t btt_make_request(struct request_queue *q, struct bio *bio) |
5212e11f | 1152 | { |
41cd8b70 | 1153 | struct bio_integrity_payload *bip = bio_integrity(bio); |
5212e11f VV |
1154 | struct btt *btt = q->queuedata; |
1155 | struct bvec_iter iter; | |
f0dc089c | 1156 | unsigned long start; |
5212e11f VV |
1157 | struct bio_vec bvec; |
1158 | int err = 0, rw; | |
f0dc089c | 1159 | bool do_acct; |
5212e11f | 1160 | |
41cd8b70 VV |
1161 | /* |
1162 | * bio_integrity_enabled also checks if the bio already has an | |
1163 | * integrity payload attached. If it does, we *don't* do a | |
1164 | * bio_integrity_prep here - the payload has been generated by | |
1165 | * another kernel subsystem, and we just pass it through. | |
1166 | */ | |
1167 | if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { | |
4246a0b6 | 1168 | bio->bi_error = -EIO; |
41cd8b70 VV |
1169 | goto out; |
1170 | } | |
1171 | ||
f0dc089c | 1172 | do_acct = nd_iostat_start(bio, &start); |
5212e11f VV |
1173 | rw = bio_data_dir(bio); |
1174 | bio_for_each_segment(bvec, bio, iter) { | |
1175 | unsigned int len = bvec.bv_len; | |
1176 | ||
1177 | BUG_ON(len > PAGE_SIZE); | |
1178 | /* Make sure len is in multiples of sector size. */ | |
1179 | /* XXX is this right? */ | |
1180 | BUG_ON(len < btt->sector_size); | |
1181 | BUG_ON(len % btt->sector_size); | |
1182 | ||
41cd8b70 | 1183 | err = btt_do_bvec(btt, bip, bvec.bv_page, len, bvec.bv_offset, |
5212e11f VV |
1184 | rw, iter.bi_sector); |
1185 | if (err) { | |
1186 | dev_info(&btt->nd_btt->dev, | |
1187 | "io error in %s sector %lld, len %d,\n", | |
1188 | (rw == READ) ? "READ" : "WRITE", | |
1189 | (unsigned long long) iter.bi_sector, len); | |
4246a0b6 | 1190 | bio->bi_error = err; |
f0dc089c | 1191 | break; |
5212e11f VV |
1192 | } |
1193 | } | |
f0dc089c DW |
1194 | if (do_acct) |
1195 | nd_iostat_end(bio, start); | |
5212e11f VV |
1196 | |
1197 | out: | |
4246a0b6 | 1198 | bio_endio(bio); |
dece1635 | 1199 | return BLK_QC_T_NONE; |
5212e11f VV |
1200 | } |
1201 | ||
1202 | static int btt_rw_page(struct block_device *bdev, sector_t sector, | |
1203 | struct page *page, int rw) | |
1204 | { | |
1205 | struct btt *btt = bdev->bd_disk->private_data; | |
1206 | ||
09cbfeaf | 1207 | btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, rw, sector); |
5212e11f VV |
1208 | page_endio(page, rw & WRITE, 0); |
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | ||
1213 | static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
1214 | { | |
1215 | /* some standard values */ | |
1216 | geo->heads = 1 << 6; | |
1217 | geo->sectors = 1 << 5; | |
1218 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | static const struct block_device_operations btt_fops = { | |
1223 | .owner = THIS_MODULE, | |
1224 | .rw_page = btt_rw_page, | |
1225 | .getgeo = btt_getgeo, | |
58138820 | 1226 | .revalidate_disk = nvdimm_revalidate_disk, |
5212e11f VV |
1227 | }; |
1228 | ||
1229 | static int btt_blk_init(struct btt *btt) | |
1230 | { | |
1231 | struct nd_btt *nd_btt = btt->nd_btt; | |
1232 | struct nd_namespace_common *ndns = nd_btt->ndns; | |
1233 | ||
1234 | /* create a new disk and request queue for btt */ | |
1235 | btt->btt_queue = blk_alloc_queue(GFP_KERNEL); | |
1236 | if (!btt->btt_queue) | |
1237 | return -ENOMEM; | |
1238 | ||
1239 | btt->btt_disk = alloc_disk(0); | |
1240 | if (!btt->btt_disk) { | |
1241 | blk_cleanup_queue(btt->btt_queue); | |
1242 | return -ENOMEM; | |
1243 | } | |
1244 | ||
1245 | nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name); | |
1246 | btt->btt_disk->driverfs_dev = &btt->nd_btt->dev; | |
5212e11f VV |
1247 | btt->btt_disk->first_minor = 0; |
1248 | btt->btt_disk->fops = &btt_fops; | |
1249 | btt->btt_disk->private_data = btt; | |
1250 | btt->btt_disk->queue = btt->btt_queue; | |
1251 | btt->btt_disk->flags = GENHD_FL_EXT_DEVT; | |
1252 | ||
1253 | blk_queue_make_request(btt->btt_queue, btt_make_request); | |
1254 | blk_queue_logical_block_size(btt->btt_queue, btt->sector_size); | |
1255 | blk_queue_max_hw_sectors(btt->btt_queue, UINT_MAX); | |
1256 | blk_queue_bounce_limit(btt->btt_queue, BLK_BOUNCE_ANY); | |
1257 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, btt->btt_queue); | |
1258 | btt->btt_queue->queuedata = btt; | |
1259 | ||
41cd8b70 | 1260 | set_capacity(btt->btt_disk, 0); |
5212e11f | 1261 | add_disk(btt->btt_disk); |
41cd8b70 VV |
1262 | if (btt_meta_size(btt)) { |
1263 | int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt)); | |
1264 | ||
1265 | if (rc) { | |
1266 | del_gendisk(btt->btt_disk); | |
1267 | put_disk(btt->btt_disk); | |
1268 | blk_cleanup_queue(btt->btt_queue); | |
1269 | return rc; | |
1270 | } | |
1271 | } | |
1272 | set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9); | |
58138820 | 1273 | revalidate_disk(btt->btt_disk); |
5212e11f VV |
1274 | |
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | static void btt_blk_cleanup(struct btt *btt) | |
1279 | { | |
1280 | del_gendisk(btt->btt_disk); | |
1281 | put_disk(btt->btt_disk); | |
1282 | blk_cleanup_queue(btt->btt_queue); | |
1283 | } | |
1284 | ||
1285 | /** | |
1286 | * btt_init - initialize a block translation table for the given device | |
1287 | * @nd_btt: device with BTT geometry and backing device info | |
1288 | * @rawsize: raw size in bytes of the backing device | |
1289 | * @lbasize: lba size of the backing device | |
1290 | * @uuid: A uuid for the backing device - this is stored on media | |
1291 | * @maxlane: maximum number of parallel requests the device can handle | |
1292 | * | |
1293 | * Initialize a Block Translation Table on a backing device to provide | |
1294 | * single sector power fail atomicity. | |
1295 | * | |
1296 | * Context: | |
1297 | * Might sleep. | |
1298 | * | |
1299 | * Returns: | |
1300 | * Pointer to a new struct btt on success, NULL on failure. | |
1301 | */ | |
1302 | static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize, | |
1303 | u32 lbasize, u8 *uuid, struct nd_region *nd_region) | |
1304 | { | |
1305 | int ret; | |
1306 | struct btt *btt; | |
1307 | struct device *dev = &nd_btt->dev; | |
1308 | ||
1309 | btt = kzalloc(sizeof(struct btt), GFP_KERNEL); | |
1310 | if (!btt) | |
1311 | return NULL; | |
1312 | ||
1313 | btt->nd_btt = nd_btt; | |
1314 | btt->rawsize = rawsize; | |
1315 | btt->lbasize = lbasize; | |
1316 | btt->sector_size = ((lbasize >= 4096) ? 4096 : 512); | |
1317 | INIT_LIST_HEAD(&btt->arena_list); | |
1318 | mutex_init(&btt->init_lock); | |
1319 | btt->nd_region = nd_region; | |
1320 | ||
1321 | ret = discover_arenas(btt); | |
1322 | if (ret) { | |
1323 | dev_err(dev, "init: error in arena_discover: %d\n", ret); | |
1324 | goto out_free; | |
1325 | } | |
1326 | ||
58138820 DW |
1327 | if (btt->init_state != INIT_READY && nd_region->ro) { |
1328 | dev_info(dev, "%s is read-only, unable to init btt metadata\n", | |
1329 | dev_name(&nd_region->dev)); | |
1330 | goto out_free; | |
1331 | } else if (btt->init_state != INIT_READY) { | |
5212e11f VV |
1332 | btt->num_arenas = (rawsize / ARENA_MAX_SIZE) + |
1333 | ((rawsize % ARENA_MAX_SIZE) ? 1 : 0); | |
1334 | dev_dbg(dev, "init: %d arenas for %llu rawsize\n", | |
1335 | btt->num_arenas, rawsize); | |
1336 | ||
1337 | ret = create_arenas(btt); | |
1338 | if (ret) { | |
1339 | dev_info(dev, "init: create_arenas: %d\n", ret); | |
1340 | goto out_free; | |
1341 | } | |
1342 | ||
1343 | ret = btt_meta_init(btt); | |
1344 | if (ret) { | |
1345 | dev_err(dev, "init: error in meta_init: %d\n", ret); | |
58138820 | 1346 | goto out_free; |
5212e11f VV |
1347 | } |
1348 | } | |
1349 | ||
1350 | ret = btt_blk_init(btt); | |
1351 | if (ret) { | |
1352 | dev_err(dev, "init: error in blk_init: %d\n", ret); | |
1353 | goto out_free; | |
1354 | } | |
1355 | ||
1356 | btt_debugfs_init(btt); | |
1357 | ||
1358 | return btt; | |
1359 | ||
1360 | out_free: | |
1361 | kfree(btt); | |
1362 | return NULL; | |
1363 | } | |
1364 | ||
1365 | /** | |
1366 | * btt_fini - de-initialize a BTT | |
1367 | * @btt: the BTT handle that was generated by btt_init | |
1368 | * | |
1369 | * De-initialize a Block Translation Table on device removal | |
1370 | * | |
1371 | * Context: | |
1372 | * Might sleep. | |
1373 | */ | |
1374 | static void btt_fini(struct btt *btt) | |
1375 | { | |
1376 | if (btt) { | |
1377 | btt_blk_cleanup(btt); | |
1378 | free_arenas(btt); | |
1379 | debugfs_remove_recursive(btt->debugfs_dir); | |
1380 | kfree(btt); | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns) | |
1385 | { | |
1386 | struct nd_btt *nd_btt = to_nd_btt(ndns->claim); | |
1387 | struct nd_region *nd_region; | |
1388 | struct btt *btt; | |
1389 | size_t rawsize; | |
1390 | ||
1391 | if (!nd_btt->uuid || !nd_btt->ndns || !nd_btt->lbasize) | |
1392 | return -ENODEV; | |
1393 | ||
1394 | rawsize = nvdimm_namespace_capacity(ndns) - SZ_4K; | |
1395 | if (rawsize < ARENA_MIN_SIZE) { | |
1396 | return -ENXIO; | |
1397 | } | |
1398 | nd_region = to_nd_region(nd_btt->dev.parent); | |
1399 | btt = btt_init(nd_btt, rawsize, nd_btt->lbasize, nd_btt->uuid, | |
1400 | nd_region); | |
1401 | if (!btt) | |
1402 | return -ENOMEM; | |
1403 | nd_btt->btt = btt; | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | EXPORT_SYMBOL(nvdimm_namespace_attach_btt); | |
1408 | ||
1409 | int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns) | |
1410 | { | |
1411 | struct nd_btt *nd_btt = to_nd_btt(ndns->claim); | |
1412 | struct btt *btt = nd_btt->btt; | |
1413 | ||
1414 | btt_fini(btt); | |
1415 | nd_btt->btt = NULL; | |
1416 | ||
1417 | return 0; | |
1418 | } | |
1419 | EXPORT_SYMBOL(nvdimm_namespace_detach_btt); | |
1420 | ||
1421 | static int __init nd_btt_init(void) | |
1422 | { | |
ff8e92d5 | 1423 | int rc = 0; |
5212e11f VV |
1424 | |
1425 | debugfs_root = debugfs_create_dir("btt", NULL); | |
ff8e92d5 | 1426 | if (IS_ERR_OR_NULL(debugfs_root)) |
5212e11f | 1427 | rc = -ENXIO; |
5212e11f VV |
1428 | |
1429 | return rc; | |
1430 | } | |
1431 | ||
1432 | static void __exit nd_btt_exit(void) | |
1433 | { | |
1434 | debugfs_remove_recursive(debugfs_root); | |
5212e11f VV |
1435 | } |
1436 | ||
1437 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT); | |
1438 | MODULE_AUTHOR("Vishal Verma <vishal.l.verma@linux.intel.com>"); | |
1439 | MODULE_LICENSE("GPL v2"); | |
1440 | module_init(nd_btt_init); | |
1441 | module_exit(nd_btt_exit); |