Lines Matching +full:background +full:- +full:layer
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Interface to Linux block layer for MTD 'translation layers'.
5 * Copyright © 2003-2010 David Woodhouse <[email protected]>
16 #include <linux/blk-mq.h>
32 put_disk(dev->disk); in blktrans_dev_release()
33 blk_mq_free_tag_set(dev->tag_set); in blktrans_dev_release()
34 kfree(dev->tag_set); in blktrans_dev_release()
35 list_del(&dev->list); in blktrans_dev_release()
41 kref_put(&dev->ref, blktrans_dev_release); in blktrans_dev_put()
54 block = blk_rq_pos(req) << 9 >> tr->blkshift; in do_blktrans_request()
55 nsect = blk_rq_cur_bytes(req) >> tr->blkshift; in do_blktrans_request()
59 if (tr->flush(dev)) in do_blktrans_request()
63 if (tr->discard(dev, block, nsect)) in do_blktrans_request()
67 buf = kmap(bio_page(req->bio)) + bio_offset(req->bio); in do_blktrans_request()
68 for (; nsect > 0; nsect--, block++, buf += tr->blksize) { in do_blktrans_request()
69 if (tr->readsect(dev, block, buf)) { in do_blktrans_request()
70 kunmap(bio_page(req->bio)); in do_blktrans_request()
74 kunmap(bio_page(req->bio)); in do_blktrans_request()
80 if (!tr->writesect) in do_blktrans_request()
86 buf = kmap(bio_page(req->bio)) + bio_offset(req->bio); in do_blktrans_request()
87 for (; nsect > 0; nsect--, block++, buf += tr->blksize) { in do_blktrans_request()
88 if (tr->writesect(dev, block, buf)) { in do_blktrans_request()
89 kunmap(bio_page(req->bio)); in do_blktrans_request()
93 kunmap(bio_page(req->bio)); in do_blktrans_request()
102 return dev->bg_stop; in mtd_blktrans_cease_background()
110 rq = list_first_entry_or_null(&dev->rq_list, struct request, queuelist); in mtd_next_request()
112 list_del_init(&rq->queuelist); in mtd_next_request()
121 __releases(&dev->queue_lock) in mtd_blktrans_work()
122 __acquires(&dev->queue_lock) in mtd_blktrans_work()
124 struct mtd_blktrans_ops *tr = dev->tr; in mtd_blktrans_work()
131 dev->bg_stop = false; in mtd_blktrans_work()
133 if (tr->background && !background_done) { in mtd_blktrans_work()
134 spin_unlock_irq(&dev->queue_lock); in mtd_blktrans_work()
135 mutex_lock(&dev->lock); in mtd_blktrans_work()
136 tr->background(dev); in mtd_blktrans_work()
137 mutex_unlock(&dev->lock); in mtd_blktrans_work()
138 spin_lock_irq(&dev->queue_lock); in mtd_blktrans_work()
140 * Do background processing just once per idle in mtd_blktrans_work()
143 background_done = !dev->bg_stop; in mtd_blktrans_work()
149 spin_unlock_irq(&dev->queue_lock); in mtd_blktrans_work()
151 mutex_lock(&dev->lock); in mtd_blktrans_work()
152 res = do_blktrans_request(dev->tr, dev, req); in mtd_blktrans_work()
153 mutex_unlock(&dev->lock); in mtd_blktrans_work()
162 spin_lock_irq(&dev->queue_lock); in mtd_blktrans_work()
171 dev = hctx->queue->queuedata; in mtd_queue_rq()
173 blk_mq_start_request(bd->rq); in mtd_queue_rq()
177 spin_lock_irq(&dev->queue_lock); in mtd_queue_rq()
178 list_add_tail(&bd->rq->queuelist, &dev->rq_list); in mtd_queue_rq()
180 spin_unlock_irq(&dev->queue_lock); in mtd_queue_rq()
187 struct mtd_blktrans_dev *dev = disk->private_data; in blktrans_open()
190 kref_get(&dev->ref); in blktrans_open()
192 mutex_lock(&dev->lock); in blktrans_open()
194 if (dev->open) in blktrans_open()
197 __module_get(dev->tr->owner); in blktrans_open()
199 if (!dev->mtd) in blktrans_open()
202 if (dev->tr->open) { in blktrans_open()
203 ret = dev->tr->open(dev); in blktrans_open()
208 ret = __get_mtd_device(dev->mtd); in blktrans_open()
211 dev->writable = mode & BLK_OPEN_WRITE; in blktrans_open()
214 dev->open++; in blktrans_open()
215 mutex_unlock(&dev->lock); in blktrans_open()
219 if (dev->tr->release) in blktrans_open()
220 dev->tr->release(dev); in blktrans_open()
222 module_put(dev->tr->owner); in blktrans_open()
223 mutex_unlock(&dev->lock); in blktrans_open()
230 struct mtd_blktrans_dev *dev = disk->private_data; in blktrans_release()
232 mutex_lock(&dev->lock); in blktrans_release()
234 if (--dev->open) in blktrans_release()
237 module_put(dev->tr->owner); in blktrans_release()
239 if (dev->mtd) { in blktrans_release()
240 if (dev->tr->release) in blktrans_release()
241 dev->tr->release(dev); in blktrans_release()
242 __put_mtd_device(dev->mtd); in blktrans_release()
245 mutex_unlock(&dev->lock); in blktrans_release()
251 struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data; in blktrans_getgeo()
252 int ret = -ENXIO; in blktrans_getgeo()
254 mutex_lock(&dev->lock); in blktrans_getgeo()
256 if (!dev->mtd) in blktrans_getgeo()
259 ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : -ENOTTY; in blktrans_getgeo()
261 mutex_unlock(&dev->lock); in blktrans_getgeo()
278 struct mtd_blktrans_ops *tr = new->tr; in add_mtd_blktrans_dev()
281 int last_devnum = -1; in add_mtd_blktrans_dev()
287 list_for_each_entry(d, &tr->devs, list) { in add_mtd_blktrans_dev()
288 if (new->devnum == -1) { in add_mtd_blktrans_dev()
290 if (d->devnum != last_devnum+1) { in add_mtd_blktrans_dev()
292 new->devnum = last_devnum+1; in add_mtd_blktrans_dev()
293 list_add_tail(&new->list, &d->list); in add_mtd_blktrans_dev()
296 } else if (d->devnum == new->devnum) { in add_mtd_blktrans_dev()
298 return -EBUSY; in add_mtd_blktrans_dev()
299 } else if (d->devnum > new->devnum) { in add_mtd_blktrans_dev()
301 list_add_tail(&new->list, &d->list); in add_mtd_blktrans_dev()
304 last_devnum = d->devnum; in add_mtd_blktrans_dev()
307 ret = -EBUSY; in add_mtd_blktrans_dev()
308 if (new->devnum == -1) in add_mtd_blktrans_dev()
309 new->devnum = last_devnum+1; in add_mtd_blktrans_dev()
314 if (new->devnum > (MINORMASK >> tr->part_bits) || in add_mtd_blktrans_dev()
315 (tr->part_bits && new->devnum >= 27 * 26)) in add_mtd_blktrans_dev()
318 list_add_tail(&new->list, &tr->devs); in add_mtd_blktrans_dev()
321 mutex_init(&new->lock); in add_mtd_blktrans_dev()
322 kref_init(&new->ref); in add_mtd_blktrans_dev()
323 if (!tr->writesect) in add_mtd_blktrans_dev()
324 new->readonly = 1; in add_mtd_blktrans_dev()
326 ret = -ENOMEM; in add_mtd_blktrans_dev()
327 new->tag_set = kzalloc(sizeof(*new->tag_set), GFP_KERNEL); in add_mtd_blktrans_dev()
328 if (!new->tag_set) in add_mtd_blktrans_dev()
331 ret = blk_mq_alloc_sq_tag_set(new->tag_set, &mtd_mq_ops, 2, in add_mtd_blktrans_dev()
336 lim.logical_block_size = tr->blksize; in add_mtd_blktrans_dev()
337 if (tr->discard) in add_mtd_blktrans_dev()
339 if (tr->flush) in add_mtd_blktrans_dev()
343 gd = blk_mq_alloc_disk(new->tag_set, &lim, new); in add_mtd_blktrans_dev()
349 new->disk = gd; in add_mtd_blktrans_dev()
350 new->rq = new->disk->queue; in add_mtd_blktrans_dev()
351 gd->private_data = new; in add_mtd_blktrans_dev()
352 gd->major = tr->major; in add_mtd_blktrans_dev()
353 gd->first_minor = (new->devnum) << tr->part_bits; in add_mtd_blktrans_dev()
354 gd->minors = 1 << tr->part_bits; in add_mtd_blktrans_dev()
355 gd->fops = &mtd_block_ops; in add_mtd_blktrans_dev()
357 if (tr->part_bits) { in add_mtd_blktrans_dev()
358 if (new->devnum < 26) in add_mtd_blktrans_dev()
359 snprintf(gd->disk_name, sizeof(gd->disk_name), in add_mtd_blktrans_dev()
360 "%s%c", tr->name, 'a' + new->devnum); in add_mtd_blktrans_dev()
362 snprintf(gd->disk_name, sizeof(gd->disk_name), in add_mtd_blktrans_dev()
363 "%s%c%c", tr->name, in add_mtd_blktrans_dev()
364 'a' - 1 + new->devnum / 26, in add_mtd_blktrans_dev()
365 'a' + new->devnum % 26); in add_mtd_blktrans_dev()
367 snprintf(gd->disk_name, sizeof(gd->disk_name), in add_mtd_blktrans_dev()
368 "%s%d", tr->name, new->devnum); in add_mtd_blktrans_dev()
369 gd->flags |= GENHD_FL_NO_PART; in add_mtd_blktrans_dev()
372 set_capacity(gd, ((u64)new->size * tr->blksize) >> 9); in add_mtd_blktrans_dev()
375 spin_lock_init(&new->queue_lock); in add_mtd_blktrans_dev()
376 INIT_LIST_HEAD(&new->rq_list); in add_mtd_blktrans_dev()
377 gd->queue = new->rq; in add_mtd_blktrans_dev()
379 if (new->readonly) in add_mtd_blktrans_dev()
382 ret = device_add_disk(&new->mtd->dev, gd, NULL); in add_mtd_blktrans_dev()
386 if (new->disk_attributes) { in add_mtd_blktrans_dev()
387 ret = sysfs_create_group(&disk_to_dev(gd)->kobj, in add_mtd_blktrans_dev()
388 new->disk_attributes); in add_mtd_blktrans_dev()
394 put_disk(new->disk); in add_mtd_blktrans_dev()
396 blk_mq_free_tag_set(new->tag_set); in add_mtd_blktrans_dev()
398 kfree(new->tag_set); in add_mtd_blktrans_dev()
400 list_del(&new->list); in add_mtd_blktrans_dev()
411 if (old->disk_attributes) in del_mtd_blktrans_dev()
412 sysfs_remove_group(&disk_to_dev(old->disk)->kobj, in del_mtd_blktrans_dev()
413 old->disk_attributes); in del_mtd_blktrans_dev()
416 del_gendisk(old->disk); in del_mtd_blktrans_dev()
419 spin_lock_irqsave(&old->queue_lock, flags); in del_mtd_blktrans_dev()
420 old->rq->queuedata = NULL; in del_mtd_blktrans_dev()
421 spin_unlock_irqrestore(&old->queue_lock, flags); in del_mtd_blktrans_dev()
424 memflags = blk_mq_freeze_queue(old->rq); in del_mtd_blktrans_dev()
425 blk_mq_quiesce_queue(old->rq); in del_mtd_blktrans_dev()
426 blk_mq_unquiesce_queue(old->rq); in del_mtd_blktrans_dev()
427 blk_mq_unfreeze_queue(old->rq, memflags); in del_mtd_blktrans_dev()
431 mutex_lock(&old->lock); in del_mtd_blktrans_dev()
432 if (old->open) { in del_mtd_blktrans_dev()
433 if (old->tr->release) in del_mtd_blktrans_dev()
434 old->tr->release(old); in del_mtd_blktrans_dev()
435 __put_mtd_device(old->mtd); in del_mtd_blktrans_dev()
438 old->mtd = NULL; in del_mtd_blktrans_dev()
440 mutex_unlock(&old->lock); in del_mtd_blktrans_dev()
451 list_for_each_entry_safe(dev, next, &tr->devs, list) in blktrans_notify_remove()
452 if (dev->mtd == mtd) in blktrans_notify_remove()
453 tr->remove_dev(dev); in blktrans_notify_remove()
460 if (mtd->type == MTD_ABSENT || mtd->type == MTD_UBIVOLUME) in blktrans_notify_add()
464 tr->add_mtd(tr, mtd); in blktrans_notify_add()
483 ret = register_blkdev(tr->major, tr->name); in register_mtd_blktrans()
486 tr->name, tr->major, ret); in register_mtd_blktrans()
491 tr->major = ret; in register_mtd_blktrans()
493 tr->blkshift = ffs(tr->blksize) - 1; in register_mtd_blktrans()
495 INIT_LIST_HEAD(&tr->devs); in register_mtd_blktrans()
498 list_add(&tr->list, &blktrans_majors); in register_mtd_blktrans()
500 if (mtd->type != MTD_ABSENT && mtd->type != MTD_UBIVOLUME) in register_mtd_blktrans()
501 tr->add_mtd(tr, mtd); in register_mtd_blktrans()
513 list_del(&tr->list); in deregister_mtd_blktrans()
515 list_for_each_entry_safe(dev, next, &tr->devs, list) in deregister_mtd_blktrans()
516 tr->remove_dev(dev); in deregister_mtd_blktrans()
519 unregister_blkdev(tr->major, tr->name); in deregister_mtd_blktrans()
521 BUG_ON(!list_empty(&tr->devs)); in deregister_mtd_blktrans()
527 /* No race here -- if someone's currently in register_mtd_blktrans in mtd_blktrans_exit()
542 MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'");