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1 | /* |
2 | raid0.c : Multiple Devices driver for Linux |
3 | Copyright (C) 1994-96 Marc ZYNGIER |
4 | <zyngier@ufr-info-p7.ibp.fr> or |
5 | <maz@gloups.fdn.fr> |
6 | Copyright (C) 1999, 2000 Ingo Molnar, Red Hat |
7 | |
8 | |
9 | RAID-0 management functions. |
10 | |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by |
13 | the Free Software Foundation; either version 2, or (at your option) |
14 | any later version. |
15 | |
16 | You should have received a copy of the GNU General Public License |
17 | (for example /usr/src/linux/COPYING); if not, write to the Free |
18 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 | */ |
20 | |
21 | #include <linux/blkdev.h> |
22 | #include <linux/seq_file.h> |
23 | #include "md.h" |
24 | #include "raid0.h" |
25 | |
26 | static void raid0_unplug(struct request_queue *q) |
27 | { |
28 | mddev_t *mddev = q->queuedata; |
29 | raid0_conf_t *conf = mddev->private; |
30 | mdk_rdev_t **devlist = conf->devlist; |
31 | int i; |
32 | |
33 | for (i=0; i<mddev->raid_disks; i++) { |
34 | struct request_queue *r_queue = bdev_get_queue(devlist[i]->bdev); |
35 | |
36 | blk_unplug(r_queue); |
37 | } |
38 | } |
39 | |
40 | static int raid0_congested(void *data, int bits) |
41 | { |
42 | mddev_t *mddev = data; |
43 | raid0_conf_t *conf = mddev->private; |
44 | mdk_rdev_t **devlist = conf->devlist; |
45 | int i, ret = 0; |
46 | |
47 | if (mddev_congested(mddev, bits)) |
48 | return 1; |
49 | |
50 | for (i = 0; i < mddev->raid_disks && !ret ; i++) { |
51 | struct request_queue *q = bdev_get_queue(devlist[i]->bdev); |
52 | |
53 | ret |= bdi_congested(&q->backing_dev_info, bits); |
54 | } |
55 | return ret; |
56 | } |
57 | |
58 | /* |
59 | * inform the user of the raid configuration |
60 | */ |
61 | static void dump_zones(mddev_t *mddev) |
62 | { |
63 | int j, k, h; |
64 | sector_t zone_size = 0; |
65 | sector_t zone_start = 0; |
66 | char b[BDEVNAME_SIZE]; |
67 | raid0_conf_t *conf = mddev->private; |
68 | printk(KERN_INFO "******* %s configuration *********\n", |
69 | mdname(mddev)); |
70 | h = 0; |
71 | for (j = 0; j < conf->nr_strip_zones; j++) { |
72 | printk(KERN_INFO "zone%d=[", j); |
73 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
74 | printk("%s/", |
75 | bdevname(conf->devlist[j*mddev->raid_disks |
76 | + k]->bdev, b)); |
77 | printk("]\n"); |
78 | |
79 | zone_size = conf->strip_zone[j].zone_end - zone_start; |
80 | printk(KERN_INFO " zone offset=%llukb " |
81 | "device offset=%llukb size=%llukb\n", |
82 | (unsigned long long)zone_start>>1, |
83 | (unsigned long long)conf->strip_zone[j].dev_start>>1, |
84 | (unsigned long long)zone_size>>1); |
85 | zone_start = conf->strip_zone[j].zone_end; |
86 | } |
87 | printk(KERN_INFO "**********************************\n\n"); |
88 | } |
89 | |
90 | static int create_strip_zones(mddev_t *mddev) |
91 | { |
92 | int i, c, err; |
93 | sector_t curr_zone_end, sectors; |
94 | mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev, **dev; |
95 | struct strip_zone *zone; |
96 | int cnt; |
97 | char b[BDEVNAME_SIZE]; |
98 | raid0_conf_t *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
99 | |
100 | if (!conf) |
101 | return -ENOMEM; |
102 | list_for_each_entry(rdev1, &mddev->disks, same_set) { |
103 | printk(KERN_INFO "raid0: looking at %s\n", |
104 | bdevname(rdev1->bdev,b)); |
105 | c = 0; |
106 | |
107 | /* round size to chunk_size */ |
108 | sectors = rdev1->sectors; |
109 | sector_div(sectors, mddev->chunk_sectors); |
110 | rdev1->sectors = sectors * mddev->chunk_sectors; |
111 | |
112 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
113 | printk(KERN_INFO "raid0: comparing %s(%llu)", |
114 | bdevname(rdev1->bdev,b), |
115 | (unsigned long long)rdev1->sectors); |
116 | printk(KERN_INFO " with %s(%llu)\n", |
117 | bdevname(rdev2->bdev,b), |
118 | (unsigned long long)rdev2->sectors); |
119 | if (rdev2 == rdev1) { |
120 | printk(KERN_INFO "raid0: END\n"); |
121 | break; |
122 | } |
123 | if (rdev2->sectors == rdev1->sectors) { |
124 | /* |
125 | * Not unique, don't count it as a new |
126 | * group |
127 | */ |
128 | printk(KERN_INFO "raid0: EQUAL\n"); |
129 | c = 1; |
130 | break; |
131 | } |
132 | printk(KERN_INFO "raid0: NOT EQUAL\n"); |
133 | } |
134 | if (!c) { |
135 | printk(KERN_INFO "raid0: ==> UNIQUE\n"); |
136 | conf->nr_strip_zones++; |
137 | printk(KERN_INFO "raid0: %d zones\n", |
138 | conf->nr_strip_zones); |
139 | } |
140 | } |
141 | printk(KERN_INFO "raid0: FINAL %d zones\n", conf->nr_strip_zones); |
142 | err = -ENOMEM; |
143 | conf->strip_zone = kzalloc(sizeof(struct strip_zone)* |
144 | conf->nr_strip_zones, GFP_KERNEL); |
145 | if (!conf->strip_zone) |
146 | goto abort; |
147 | conf->devlist = kzalloc(sizeof(mdk_rdev_t*)* |
148 | conf->nr_strip_zones*mddev->raid_disks, |
149 | GFP_KERNEL); |
150 | if (!conf->devlist) |
151 | goto abort; |
152 | |
153 | /* The first zone must contain all devices, so here we check that |
154 | * there is a proper alignment of slots to devices and find them all |
155 | */ |
156 | zone = &conf->strip_zone[0]; |
157 | cnt = 0; |
158 | smallest = NULL; |
159 | dev = conf->devlist; |
160 | err = -EINVAL; |
161 | list_for_each_entry(rdev1, &mddev->disks, same_set) { |
162 | int j = rdev1->raid_disk; |
163 | |
164 | if (j < 0 || j >= mddev->raid_disks) { |
165 | printk(KERN_ERR "raid0: bad disk number %d - " |
166 | "aborting!\n", j); |
167 | goto abort; |
168 | } |
169 | if (dev[j]) { |
170 | printk(KERN_ERR "raid0: multiple devices for %d - " |
171 | "aborting!\n", j); |
172 | goto abort; |
173 | } |
174 | dev[j] = rdev1; |
175 | |
176 | disk_stack_limits(mddev->gendisk, rdev1->bdev, |
177 | rdev1->data_offset << 9); |
178 | /* as we don't honour merge_bvec_fn, we must never risk |
179 | * violating it, so limit ->max_sector to one PAGE, as |
180 | * a one page request is never in violation. |
181 | */ |
182 | |
183 | if (rdev1->bdev->bd_disk->queue->merge_bvec_fn && |
184 | queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9)) |
185 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); |
186 | |
187 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
188 | smallest = rdev1; |
189 | cnt++; |
190 | } |
191 | if (cnt != mddev->raid_disks) { |
192 | printk(KERN_ERR "raid0: too few disks (%d of %d) - " |
193 | "aborting!\n", cnt, mddev->raid_disks); |
194 | goto abort; |
195 | } |
196 | zone->nb_dev = cnt; |
197 | zone->zone_end = smallest->sectors * cnt; |
198 | |
199 | curr_zone_end = zone->zone_end; |
200 | |
201 | /* now do the other zones */ |
202 | for (i = 1; i < conf->nr_strip_zones; i++) |
203 | { |
204 | int j; |
205 | |
206 | zone = conf->strip_zone + i; |
207 | dev = conf->devlist + i * mddev->raid_disks; |
208 | |
209 | printk(KERN_INFO "raid0: zone %d\n", i); |
210 | zone->dev_start = smallest->sectors; |
211 | smallest = NULL; |
212 | c = 0; |
213 | |
214 | for (j=0; j<cnt; j++) { |
215 | rdev = conf->devlist[j]; |
216 | printk(KERN_INFO "raid0: checking %s ...", |
217 | bdevname(rdev->bdev, b)); |
218 | if (rdev->sectors <= zone->dev_start) { |
219 | printk(KERN_INFO " nope.\n"); |
220 | continue; |
221 | } |
222 | printk(KERN_INFO " contained as device %d\n", c); |
223 | dev[c] = rdev; |
224 | c++; |
225 | if (!smallest || rdev->sectors < smallest->sectors) { |
226 | smallest = rdev; |
227 | printk(KERN_INFO " (%llu) is smallest!.\n", |
228 | (unsigned long long)rdev->sectors); |
229 | } |
230 | } |
231 | |
232 | zone->nb_dev = c; |
233 | sectors = (smallest->sectors - zone->dev_start) * c; |
234 | printk(KERN_INFO "raid0: zone->nb_dev: %d, sectors: %llu\n", |
235 | zone->nb_dev, (unsigned long long)sectors); |
236 | |
237 | curr_zone_end += sectors; |
238 | zone->zone_end = curr_zone_end; |
239 | |
240 | printk(KERN_INFO "raid0: current zone start: %llu\n", |
241 | (unsigned long long)smallest->sectors); |
242 | } |
243 | mddev->queue->unplug_fn = raid0_unplug; |
244 | mddev->queue->backing_dev_info.congested_fn = raid0_congested; |
245 | mddev->queue->backing_dev_info.congested_data = mddev; |
246 | |
247 | /* |
248 | * now since we have the hard sector sizes, we can make sure |
249 | * chunk size is a multiple of that sector size |
250 | */ |
251 | if ((mddev->chunk_sectors << 9) % queue_logical_block_size(mddev->queue)) { |
252 | printk(KERN_ERR "%s chunk_size of %d not valid\n", |
253 | mdname(mddev), |
254 | mddev->chunk_sectors << 9); |
255 | goto abort; |
256 | } |
257 | |
258 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); |
259 | blk_queue_io_opt(mddev->queue, |
260 | (mddev->chunk_sectors << 9) * mddev->raid_disks); |
261 | |
262 | printk(KERN_INFO "raid0: done.\n"); |
263 | mddev->private = conf; |
264 | return 0; |
265 | abort: |
266 | kfree(conf->strip_zone); |
267 | kfree(conf->devlist); |
268 | kfree(conf); |
269 | mddev->private = NULL; |
270 | return err; |
271 | } |
272 | |
273 | /** |
274 | * raid0_mergeable_bvec -- tell bio layer if a two requests can be merged |
275 | * @q: request queue |
276 | * @bvm: properties of new bio |
277 | * @biovec: the request that could be merged to it. |
278 | * |
279 | * Return amount of bytes we can accept at this offset |
280 | */ |
281 | static int raid0_mergeable_bvec(struct request_queue *q, |
282 | struct bvec_merge_data *bvm, |
283 | struct bio_vec *biovec) |
284 | { |
285 | mddev_t *mddev = q->queuedata; |
286 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); |
287 | int max; |
288 | unsigned int chunk_sectors = mddev->chunk_sectors; |
289 | unsigned int bio_sectors = bvm->bi_size >> 9; |
290 | |
291 | if (is_power_of_2(chunk_sectors)) |
292 | max = (chunk_sectors - ((sector & (chunk_sectors-1)) |
293 | + bio_sectors)) << 9; |
294 | else |
295 | max = (chunk_sectors - (sector_div(sector, chunk_sectors) |
296 | + bio_sectors)) << 9; |
297 | if (max < 0) max = 0; /* bio_add cannot handle a negative return */ |
298 | if (max <= biovec->bv_len && bio_sectors == 0) |
299 | return biovec->bv_len; |
300 | else |
301 | return max; |
302 | } |
303 | |
304 | static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks) |
305 | { |
306 | sector_t array_sectors = 0; |
307 | mdk_rdev_t *rdev; |
308 | |
309 | WARN_ONCE(sectors || raid_disks, |
310 | "%s does not support generic reshape\n", __func__); |
311 | |
312 | list_for_each_entry(rdev, &mddev->disks, same_set) |
313 | array_sectors += rdev->sectors; |
314 | |
315 | return array_sectors; |
316 | } |
317 | |
318 | static int raid0_run(mddev_t *mddev) |
319 | { |
320 | int ret; |
321 | |
322 | if (mddev->chunk_sectors == 0) { |
323 | printk(KERN_ERR "md/raid0: chunk size must be set.\n"); |
324 | return -EINVAL; |
325 | } |
326 | if (md_check_no_bitmap(mddev)) |
327 | return -EINVAL; |
328 | blk_queue_max_sectors(mddev->queue, mddev->chunk_sectors); |
329 | mddev->queue->queue_lock = &mddev->queue->__queue_lock; |
330 | |
331 | ret = create_strip_zones(mddev); |
332 | if (ret < 0) |
333 | return ret; |
334 | |
335 | /* calculate array device size */ |
336 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
337 | |
338 | printk(KERN_INFO "raid0 : md_size is %llu sectors.\n", |
339 | (unsigned long long)mddev->array_sectors); |
340 | /* calculate the max read-ahead size. |
341 | * For read-ahead of large files to be effective, we need to |
342 | * readahead at least twice a whole stripe. i.e. number of devices |
343 | * multiplied by chunk size times 2. |
344 | * If an individual device has an ra_pages greater than the |
345 | * chunk size, then we will not drive that device as hard as it |
346 | * wants. We consider this a configuration error: a larger |
347 | * chunksize should be used in that case. |
348 | */ |
349 | { |
350 | int stripe = mddev->raid_disks * |
351 | (mddev->chunk_sectors << 9) / PAGE_SIZE; |
352 | if (mddev->queue->backing_dev_info.ra_pages < 2* stripe) |
353 | mddev->queue->backing_dev_info.ra_pages = 2* stripe; |
354 | } |
355 | |
356 | blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec); |
357 | dump_zones(mddev); |
358 | md_integrity_register(mddev); |
359 | return 0; |
360 | } |
361 | |
362 | static int raid0_stop(mddev_t *mddev) |
363 | { |
364 | raid0_conf_t *conf = mddev->private; |
365 | |
366 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
367 | kfree(conf->strip_zone); |
368 | kfree(conf->devlist); |
369 | kfree(conf); |
370 | mddev->private = NULL; |
371 | return 0; |
372 | } |
373 | |
374 | /* Find the zone which holds a particular offset |
375 | * Update *sectorp to be an offset in that zone |
376 | */ |
377 | static struct strip_zone *find_zone(struct raid0_private_data *conf, |
378 | sector_t *sectorp) |
379 | { |
380 | int i; |
381 | struct strip_zone *z = conf->strip_zone; |
382 | sector_t sector = *sectorp; |
383 | |
384 | for (i = 0; i < conf->nr_strip_zones; i++) |
385 | if (sector < z[i].zone_end) { |
386 | if (i) |
387 | *sectorp = sector - z[i-1].zone_end; |
388 | return z + i; |
389 | } |
390 | BUG(); |
391 | } |
392 | |
393 | /* |
394 | * remaps the bio to the target device. we separate two flows. |
395 | * power 2 flow and a general flow for the sake of perfromance |
396 | */ |
397 | static mdk_rdev_t *map_sector(mddev_t *mddev, struct strip_zone *zone, |
398 | sector_t sector, sector_t *sector_offset) |
399 | { |
400 | unsigned int sect_in_chunk; |
401 | sector_t chunk; |
402 | raid0_conf_t *conf = mddev->private; |
403 | unsigned int chunk_sects = mddev->chunk_sectors; |
404 | |
405 | if (is_power_of_2(chunk_sects)) { |
406 | int chunksect_bits = ffz(~chunk_sects); |
407 | /* find the sector offset inside the chunk */ |
408 | sect_in_chunk = sector & (chunk_sects - 1); |
409 | sector >>= chunksect_bits; |
410 | /* chunk in zone */ |
411 | chunk = *sector_offset; |
412 | /* quotient is the chunk in real device*/ |
413 | sector_div(chunk, zone->nb_dev << chunksect_bits); |
414 | } else{ |
415 | sect_in_chunk = sector_div(sector, chunk_sects); |
416 | chunk = *sector_offset; |
417 | sector_div(chunk, chunk_sects * zone->nb_dev); |
418 | } |
419 | /* |
420 | * position the bio over the real device |
421 | * real sector = chunk in device + starting of zone |
422 | * + the position in the chunk |
423 | */ |
424 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; |
425 | return conf->devlist[(zone - conf->strip_zone)*mddev->raid_disks |
426 | + sector_div(sector, zone->nb_dev)]; |
427 | } |
428 | |
429 | /* |
430 | * Is io distribute over 1 or more chunks ? |
431 | */ |
432 | static inline int is_io_in_chunk_boundary(mddev_t *mddev, |
433 | unsigned int chunk_sects, struct bio *bio) |
434 | { |
435 | if (likely(is_power_of_2(chunk_sects))) { |
436 | return chunk_sects >= ((bio->bi_sector & (chunk_sects-1)) |
437 | + (bio->bi_size >> 9)); |
438 | } else{ |
439 | sector_t sector = bio->bi_sector; |
440 | return chunk_sects >= (sector_div(sector, chunk_sects) |
441 | + (bio->bi_size >> 9)); |
442 | } |
443 | } |
444 | |
445 | static int raid0_make_request(struct request_queue *q, struct bio *bio) |
446 | { |
447 | mddev_t *mddev = q->queuedata; |
448 | unsigned int chunk_sects; |
449 | sector_t sector_offset; |
450 | struct strip_zone *zone; |
451 | mdk_rdev_t *tmp_dev; |
452 | const int rw = bio_data_dir(bio); |
453 | int cpu; |
454 | |
455 | if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) { |
456 | bio_endio(bio, -EOPNOTSUPP); |
457 | return 0; |
458 | } |
459 | |
460 | cpu = part_stat_lock(); |
461 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); |
462 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], |
463 | bio_sectors(bio)); |
464 | part_stat_unlock(); |
465 | |
466 | chunk_sects = mddev->chunk_sectors; |
467 | if (unlikely(!is_io_in_chunk_boundary(mddev, chunk_sects, bio))) { |
468 | sector_t sector = bio->bi_sector; |
469 | struct bio_pair *bp; |
470 | /* Sanity check -- queue functions should prevent this happening */ |
471 | if (bio->bi_vcnt != 1 || |
472 | bio->bi_idx != 0) |
473 | goto bad_map; |
474 | /* This is a one page bio that upper layers |
475 | * refuse to split for us, so we need to split it. |
476 | */ |
477 | if (likely(is_power_of_2(chunk_sects))) |
478 | bp = bio_split(bio, chunk_sects - (sector & |
479 | (chunk_sects-1))); |
480 | else |
481 | bp = bio_split(bio, chunk_sects - |
482 | sector_div(sector, chunk_sects)); |
483 | if (raid0_make_request(q, &bp->bio1)) |
484 | generic_make_request(&bp->bio1); |
485 | if (raid0_make_request(q, &bp->bio2)) |
486 | generic_make_request(&bp->bio2); |
487 | |
488 | bio_pair_release(bp); |
489 | return 0; |
490 | } |
491 | |
492 | sector_offset = bio->bi_sector; |
493 | zone = find_zone(mddev->private, §or_offset); |
494 | tmp_dev = map_sector(mddev, zone, bio->bi_sector, |
495 | §or_offset); |
496 | bio->bi_bdev = tmp_dev->bdev; |
497 | bio->bi_sector = sector_offset + zone->dev_start + |
498 | tmp_dev->data_offset; |
499 | /* |
500 | * Let the main block layer submit the IO and resolve recursion: |
501 | */ |
502 | return 1; |
503 | |
504 | bad_map: |
505 | printk("raid0_make_request bug: can't convert block across chunks" |
506 | " or bigger than %dk %llu %d\n", chunk_sects / 2, |
507 | (unsigned long long)bio->bi_sector, bio->bi_size >> 10); |
508 | |
509 | bio_io_error(bio); |
510 | return 0; |
511 | } |
512 | |
513 | static void raid0_status(struct seq_file *seq, mddev_t *mddev) |
514 | { |
515 | #undef MD_DEBUG |
516 | #ifdef MD_DEBUG |
517 | int j, k, h; |
518 | char b[BDEVNAME_SIZE]; |
519 | raid0_conf_t *conf = mddev->private; |
520 | |
521 | sector_t zone_size; |
522 | sector_t zone_start = 0; |
523 | h = 0; |
524 | |
525 | for (j = 0; j < conf->nr_strip_zones; j++) { |
526 | seq_printf(seq, " z%d", j); |
527 | seq_printf(seq, "=["); |
528 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
529 | seq_printf(seq, "%s/", bdevname( |
530 | conf->devlist[j*mddev->raid_disks + k] |
531 | ->bdev, b)); |
532 | |
533 | zone_size = conf->strip_zone[j].zone_end - zone_start; |
534 | seq_printf(seq, "] ze=%lld ds=%lld s=%lld\n", |
535 | (unsigned long long)zone_start>>1, |
536 | (unsigned long long)conf->strip_zone[j].dev_start>>1, |
537 | (unsigned long long)zone_size>>1); |
538 | zone_start = conf->strip_zone[j].zone_end; |
539 | } |
540 | #endif |
541 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
542 | return; |
543 | } |
544 | |
545 | static struct mdk_personality raid0_personality= |
546 | { |
547 | .name = "raid0", |
548 | .level = 0, |
549 | .owner = THIS_MODULE, |
550 | .make_request = raid0_make_request, |
551 | .run = raid0_run, |
552 | .stop = raid0_stop, |
553 | .status = raid0_status, |
554 | .size = raid0_size, |
555 | }; |
556 | |
557 | static int __init raid0_init (void) |
558 | { |
559 | return register_md_personality (&raid0_personality); |
560 | } |
561 | |
562 | static void raid0_exit (void) |
563 | { |
564 | unregister_md_personality (&raid0_personality); |
565 | } |
566 | |
567 | module_init(raid0_init); |
568 | module_exit(raid0_exit); |
569 | MODULE_LICENSE("GPL"); |
570 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
571 | MODULE_ALIAS("md-raid0"); |
572 | MODULE_ALIAS("md-level-0"); |
573 |
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jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9