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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
David Woodhousea1452a32010-08-08 20:58:20 +01002 * Interface to Linux block layer for MTD 'translation layers'.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
David Woodhousea1452a32010-08-08 20:58:20 +01004 * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 *
20 */
21
22#include <linux/kernel.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/list.h>
26#include <linux/fs.h>
27#include <linux/mtd/blktrans.h>
28#include <linux/mtd/mtd.h>
29#include <linux/blkdev.h>
30#include <linux/blkpg.h>
31#include <linux/spinlock.h>
32#include <linux/hdreg.h>
Ingo Molnar48b19262006-03-31 02:29:41 -080033#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Ben Dooks356d70f2007-05-28 20:28:34 +010036#include "mtdcore.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Ben Dooks356d70f2007-05-28 20:28:34 +010038static LIST_HEAD(blktrans_majors);
Maxim Levitsky048d8712010-02-22 20:39:30 +020039static DEFINE_MUTEX(blktrans_ref_mutex);
40
H Hartley Sweeten7f53f122011-01-11 18:46:10 -060041static void blktrans_dev_release(struct kref *kref)
Maxim Levitsky048d8712010-02-22 20:39:30 +020042{
43 struct mtd_blktrans_dev *dev =
44 container_of(kref, struct mtd_blktrans_dev, ref);
45
46 dev->disk->private_data = NULL;
Maxim Levitskye4d64ca2010-02-27 02:31:51 +020047 blk_cleanup_queue(dev->rq);
Maxim Levitsky048d8712010-02-22 20:39:30 +020048 put_disk(dev->disk);
49 list_del(&dev->list);
50 kfree(dev);
51}
52
53static struct mtd_blktrans_dev *blktrans_dev_get(struct gendisk *disk)
54{
55 struct mtd_blktrans_dev *dev;
56
57 mutex_lock(&blktrans_ref_mutex);
58 dev = disk->private_data;
59
60 if (!dev)
61 goto unlock;
62 kref_get(&dev->ref);
63unlock:
64 mutex_unlock(&blktrans_ref_mutex);
65 return dev;
66}
67
H Hartley Sweeten7f53f122011-01-11 18:46:10 -060068static void blktrans_dev_put(struct mtd_blktrans_dev *dev)
Maxim Levitsky048d8712010-02-22 20:39:30 +020069{
70 mutex_lock(&blktrans_ref_mutex);
71 kref_put(&dev->ref, blktrans_dev_release);
72 mutex_unlock(&blktrans_ref_mutex);
73}
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76static int do_blktrans_request(struct mtd_blktrans_ops *tr,
77 struct mtd_blktrans_dev *dev,
78 struct request *req)
79{
80 unsigned long block, nsect;
81 char *buf;
82
Tejun Heo83096eb2009-05-07 22:24:39 +090083 block = blk_rq_pos(req) << 9 >> tr->blkshift;
Tejun Heo1011c1b2009-05-07 22:24:45 +090084 nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
Jens Axboeb4f42e22014-04-10 09:46:28 -060085 buf = bio_data(req->bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Christoph Hellwig33659eb2010-08-07 18:17:56 +020087 if (req->cmd_type != REQ_TYPE_FS)
Tejun Heof06d9a22009-04-23 11:05:19 +090088 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Roman Peniaev566c0d62014-03-08 21:59:14 +090090 if (req->cmd_flags & REQ_FLUSH)
91 return tr->flush(dev);
92
Tejun Heo83096eb2009-05-07 22:24:39 +090093 if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
94 get_capacity(req->rq_disk))
Tejun Heof06d9a22009-04-23 11:05:19 +090095 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Christoph Hellwig33659eb2010-08-07 18:17:56 +020097 if (req->cmd_flags & REQ_DISCARD)
Christoph Hellwig1122a262009-09-30 13:52:12 +020098 return tr->discard(dev, block, nsect);
99
Tomer Barletzcc7fce82015-08-04 21:00:24 -0700100 if (rq_data_dir(req) == READ) {
Richard Purdie19187672006-10-27 09:09:33 +0100101 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 if (tr->readsect(dev, block, buf))
Tejun Heof06d9a22009-04-23 11:05:19 +0900103 return -EIO;
Ilya Loginov2d4dc892009-11-26 09:16:19 +0100104 rq_flush_dcache_pages(req);
Tejun Heof06d9a22009-04-23 11:05:19 +0900105 return 0;
Tomer Barletzcc7fce82015-08-04 21:00:24 -0700106 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 if (!tr->writesect)
Tejun Heof06d9a22009-04-23 11:05:19 +0900108 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Ilya Loginov2d4dc892009-11-26 09:16:19 +0100110 rq_flush_dcache_pages(req);
Richard Purdie19187672006-10-27 09:09:33 +0100111 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (tr->writesect(dev, block, buf))
Tejun Heof06d9a22009-04-23 11:05:19 +0900113 return -EIO;
114 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
116}
117
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200118int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev)
119{
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200120 return dev->bg_stop;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200121}
122EXPORT_SYMBOL_GPL(mtd_blktrans_cease_background);
123
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300124static void mtd_blktrans_work(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300126 struct mtd_blktrans_dev *dev =
127 container_of(work, struct mtd_blktrans_dev, work);
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200128 struct mtd_blktrans_ops *tr = dev->tr;
Maxim Levitskya8638622010-02-22 20:39:29 +0200129 struct request_queue *rq = dev->rq;
Tejun Heo1498ada2009-05-08 11:54:11 +0900130 struct request *req = NULL;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200131 int background_done = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 spin_lock_irq(rq->queue_lock);
Tejun Heo1498ada2009-05-08 11:54:11 +0900134
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300135 while (1) {
Tejun Heof06d9a22009-04-23 11:05:19 +0900136 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200138 dev->bg_stop = false;
Tejun Heo9934c8c2009-05-08 11:54:16 +0900139 if (!req && !(req = blk_fetch_request(rq))) {
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200140 if (tr->background && !background_done) {
141 spin_unlock_irq(rq->queue_lock);
142 mutex_lock(&dev->lock);
143 tr->background(dev);
144 mutex_unlock(&dev->lock);
145 spin_lock_irq(rq->queue_lock);
146 /*
147 * Do background processing just once per idle
148 * period.
149 */
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200150 background_done = !dev->bg_stop;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200151 continue;
152 }
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300153 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 spin_unlock_irq(rq->queue_lock);
157
Ingo Molnar48b19262006-03-31 02:29:41 -0800158 mutex_lock(&dev->lock);
Maxim Levitskya8638622010-02-22 20:39:29 +0200159 res = do_blktrans_request(dev->tr, dev, req);
Ingo Molnar48b19262006-03-31 02:29:41 -0800160 mutex_unlock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 spin_lock_irq(rq->queue_lock);
163
Tejun Heo1498ada2009-05-08 11:54:11 +0900164 if (!__blk_end_request_cur(req, res))
165 req = NULL;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200166
167 background_done = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
Tejun Heo1498ada2009-05-08 11:54:11 +0900169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 spin_unlock_irq(rq->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
173static void mtd_blktrans_request(struct request_queue *rq)
174{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200175 struct mtd_blktrans_dev *dev;
176 struct request *req = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Maxim Levitsky048d8712010-02-22 20:39:30 +0200178 dev = rq->queuedata;
179
180 if (!dev)
181 while ((req = blk_fetch_request(rq)) != NULL)
182 __blk_end_request_all(req, -ENODEV);
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300183 else
184 queue_work(dev->wq, &dev->work);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200185}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Al Viroaf0e2a02008-03-02 10:35:06 -0500187static int blktrans_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200189 struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
Maxim Levitsky008c7512010-10-15 17:20:43 +0200190 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Maxim Levitsky048d8712010-02-22 20:39:30 +0200192 if (!dev)
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200193 return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Brian Norris073db4a2015-05-07 17:55:16 -0700195 mutex_lock(&mtd_table_mutex);
Brian Norrisf3c63792015-10-26 10:20:23 -0700196 mutex_lock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Brian Norris342ff282011-11-07 15:51:05 -0800198 if (dev->open)
Maxim Levitsky048d8712010-02-22 20:39:30 +0200199 goto unlock;
Maxim Levitsky008c7512010-10-15 17:20:43 +0200200
201 kref_get(&dev->ref);
202 __module_get(dev->tr->owner);
203
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300204 if (!dev->mtd)
205 goto unlock;
206
207 if (dev->tr->open) {
208 ret = dev->tr->open(dev);
209 if (ret)
210 goto error_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
Maxim Levitsky048d8712010-02-22 20:39:30 +0200212
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300213 ret = __get_mtd_device(dev->mtd);
214 if (ret)
215 goto error_release;
Alexander Stein70d50982012-01-10 13:26:58 +0100216 dev->file_mode = mode;
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300217
Maxim Levitsky048d8712010-02-22 20:39:30 +0200218unlock:
Brian Norris342ff282011-11-07 15:51:05 -0800219 dev->open++;
Maxim Levitsky048d8712010-02-22 20:39:30 +0200220 mutex_unlock(&dev->lock);
Brian Norrisf3c63792015-10-26 10:20:23 -0700221 mutex_unlock(&mtd_table_mutex);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200222 blktrans_dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 return ret;
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300224
225error_release:
226 if (dev->tr->release)
227 dev->tr->release(dev);
228error_put:
229 module_put(dev->tr->owner);
230 kref_put(&dev->ref, blktrans_dev_release);
231 mutex_unlock(&dev->lock);
Brian Norrisf3c63792015-10-26 10:20:23 -0700232 mutex_unlock(&mtd_table_mutex);
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300233 blktrans_dev_put(dev);
234 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
Al Virodb2a1442013-05-05 21:52:57 -0400237static void blktrans_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200239 struct mtd_blktrans_dev *dev = blktrans_dev_get(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
Maxim Levitsky048d8712010-02-22 20:39:30 +0200241 if (!dev)
Al Virodb2a1442013-05-05 21:52:57 -0400242 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Brian Norris073db4a2015-05-07 17:55:16 -0700244 mutex_lock(&mtd_table_mutex);
Brian Norrisf3c63792015-10-26 10:20:23 -0700245 mutex_lock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Maxim Levitsky008c7512010-10-15 17:20:43 +0200247 if (--dev->open)
Maxim Levitsky048d8712010-02-22 20:39:30 +0200248 goto unlock;
249
Maxim Levitsky008c7512010-10-15 17:20:43 +0200250 kref_put(&dev->ref, blktrans_dev_release);
251 module_put(dev->tr->owner);
252
253 if (dev->mtd) {
Al Viroa8ca8892013-05-05 21:31:22 -0400254 if (dev->tr->release)
255 dev->tr->release(dev);
Maxim Levitsky008c7512010-10-15 17:20:43 +0200256 __put_mtd_device(dev->mtd);
257 }
Maxim Levitsky048d8712010-02-22 20:39:30 +0200258unlock:
259 mutex_unlock(&dev->lock);
Brian Norrisf3c63792015-10-26 10:20:23 -0700260 mutex_unlock(&mtd_table_mutex);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200261 blktrans_dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262}
263
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800264static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
265{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200266 struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
267 int ret = -ENXIO;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800268
Maxim Levitsky048d8712010-02-22 20:39:30 +0200269 if (!dev)
270 return ret;
271
272 mutex_lock(&dev->lock);
273
274 if (!dev->mtd)
275 goto unlock;
276
Brian Norrisc4a3f132015-05-21 10:44:32 -0700277 ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : -ENOTTY;
Maxim Levitsky048d8712010-02-22 20:39:30 +0200278unlock:
279 mutex_unlock(&dev->lock);
280 blktrans_dev_put(dev);
281 return ret;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800282}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Al Viroaf0e2a02008-03-02 10:35:06 -0500284static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 unsigned int cmd, unsigned long arg)
286{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200287 struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
288 int ret = -ENXIO;
289
290 if (!dev)
291 return ret;
292
293 mutex_lock(&dev->lock);
294
295 if (!dev->mtd)
296 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298 switch (cmd) {
299 case BLKFLSBUF:
Maxim Levitsky048d8712010-02-22 20:39:30 +0200300 ret = dev->tr->flush ? dev->tr->flush(dev) : 0;
Dan Carpenter007c2d82010-05-31 16:03:38 +0200301 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 default:
Maxim Levitsky048d8712010-02-22 20:39:30 +0200303 ret = -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
Maxim Levitsky048d8712010-02-22 20:39:30 +0200305unlock:
306 mutex_unlock(&dev->lock);
307 blktrans_dev_put(dev);
308 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
Ezequiel Garcia9329c5eb2012-11-09 12:36:35 -0300311static const struct block_device_operations mtd_block_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 .owner = THIS_MODULE,
Al Viroaf0e2a02008-03-02 10:35:06 -0500313 .open = blktrans_open,
314 .release = blktrans_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200315 .ioctl = blktrans_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800316 .getgeo = blktrans_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317};
318
319int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
320{
321 struct mtd_blktrans_ops *tr = new->tr;
Chris Malley71a928c2008-05-19 20:11:50 +0100322 struct mtd_blktrans_dev *d;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 int last_devnum = -1;
324 struct gendisk *gd;
Maxim Levitskya8638622010-02-22 20:39:29 +0200325 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Jean Delvareb3561ea2007-05-08 00:30:46 -0700327 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800328 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 BUG();
330 }
331
Maxim Levitsky048d8712010-02-22 20:39:30 +0200332 mutex_lock(&blktrans_ref_mutex);
Chris Malley71a928c2008-05-19 20:11:50 +0100333 list_for_each_entry(d, &tr->devs, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (new->devnum == -1) {
335 /* Use first free number */
336 if (d->devnum != last_devnum+1) {
337 /* Found a free devnum. Plug it in here */
338 new->devnum = last_devnum+1;
339 list_add_tail(&new->list, &d->list);
340 goto added;
341 }
342 } else if (d->devnum == new->devnum) {
343 /* Required number taken */
Maxim Levitsky048d8712010-02-22 20:39:30 +0200344 mutex_unlock(&blktrans_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return -EBUSY;
346 } else if (d->devnum > new->devnum) {
347 /* Required number was free */
348 list_add_tail(&new->list, &d->list);
349 goto added;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000350 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 last_devnum = d->devnum;
352 }
Maxim Levitskya8638622010-02-22 20:39:29 +0200353
354 ret = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 if (new->devnum == -1)
356 new->devnum = last_devnum+1;
357
Ben Hutchings4d3a8532010-01-29 20:59:53 +0000358 /* Check that the device and any partitions will get valid
359 * minor numbers and that the disk naming code below can cope
360 * with this number. */
361 if (new->devnum > (MINORMASK >> tr->part_bits) ||
Maxim Levitsky048d8712010-02-22 20:39:30 +0200362 (tr->part_bits && new->devnum >= 27 * 26)) {
363 mutex_unlock(&blktrans_ref_mutex);
Maxim Levitskya8638622010-02-22 20:39:29 +0200364 goto error1;
Maxim Levitsky048d8712010-02-22 20:39:30 +0200365 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 list_add_tail(&new->list, &tr->devs);
368 added:
Maxim Levitsky048d8712010-02-22 20:39:30 +0200369 mutex_unlock(&blktrans_ref_mutex);
370
David Woodhousece37ab42007-12-03 12:46:12 +0000371 mutex_init(&new->lock);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200372 kref_init(&new->ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 if (!tr->writesect)
374 new->readonly = 1;
375
Maxim Levitskya8638622010-02-22 20:39:29 +0200376 /* Create gendisk */
377 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 gd = alloc_disk(1 << tr->part_bits);
Maxim Levitskya8638622010-02-22 20:39:29 +0200379
380 if (!gd)
381 goto error2;
382
383 new->disk = gd;
384 gd->private_data = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 gd->major = tr->major;
386 gd->first_minor = (new->devnum) << tr->part_bits;
Ezequiel Garcia9329c5eb2012-11-09 12:36:35 -0300387 gd->fops = &mtd_block_ops;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000388
Todd Poynor65a8de32005-07-29 20:42:07 +0100389 if (tr->part_bits)
390 if (new->devnum < 26)
391 snprintf(gd->disk_name, sizeof(gd->disk_name),
392 "%s%c", tr->name, 'a' + new->devnum);
393 else
394 snprintf(gd->disk_name, sizeof(gd->disk_name),
395 "%s%c%c", tr->name,
396 'a' - 1 + new->devnum / 26,
397 'a' + new->devnum % 26);
398 else
399 snprintf(gd->disk_name, sizeof(gd->disk_name),
400 "%s%d", tr->name, new->devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Peng Fan2ce401d2015-09-11 21:41:47 +0800402 set_capacity(gd, ((u64)new->size * tr->blksize) >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Maxim Levitskya8638622010-02-22 20:39:29 +0200404 /* Create the request queue */
405 spin_lock_init(&new->queue_lock);
406 new->rq = blk_init_queue(mtd_blktrans_request, &new->queue_lock);
407
408 if (!new->rq)
409 goto error3;
410
Roman Peniaev566c0d62014-03-08 21:59:14 +0900411 if (tr->flush)
412 blk_queue_flush(new->rq, REQ_FLUSH);
413
Maxim Levitskya8638622010-02-22 20:39:29 +0200414 new->rq->queuedata = new;
415 blk_queue_logical_block_size(new->rq, tr->blksize);
416
Dan McGee16f7eca2011-09-28 00:21:42 -0500417 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, new->rq);
Mike Snitzerb277da02014-10-04 10:55:32 -0600418 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, new->rq);
Dan McGee16f7eca2011-09-28 00:21:42 -0500419
Jarkko Lavinen115ee882011-02-14 16:16:10 +0200420 if (tr->discard) {
421 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq);
Jens Axboe2bb4cd52015-07-14 08:15:12 -0600422 blk_queue_max_discard_sectors(new->rq, UINT_MAX);
Jarkko Lavinen115ee882011-02-14 16:16:10 +0200423 }
Maxim Levitskya8638622010-02-22 20:39:29 +0200424
425 gd->queue = new->rq;
426
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300427 /* Create processing workqueue */
428 new->wq = alloc_workqueue("%s%d", 0, 0,
429 tr->name, new->mtd->index);
430 if (!new->wq)
Maxim Levitskya8638622010-02-22 20:39:29 +0200431 goto error4;
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300432 INIT_WORK(&new->work, mtd_blktrans_work);
433
David Woodhoused6948462009-04-05 07:38:33 -0700434 gd->driverfs_dev = &new->mtd->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 if (new->readonly)
437 set_disk_ro(gd, 1);
438
439 add_disk(gd);
Maxim Levitsky026ec572010-02-22 20:39:33 +0200440
Maxim Levitsky133fa8c2010-02-26 22:08:40 +0200441 if (new->disk_attributes) {
442 ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
Maxim Levitsky026ec572010-02-22 20:39:33 +0200443 new->disk_attributes);
Maxim Levitsky133fa8c2010-02-26 22:08:40 +0200444 WARN_ON(ret);
445 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return 0;
Maxim Levitskya8638622010-02-22 20:39:29 +0200447error4:
448 blk_cleanup_queue(new->rq);
449error3:
450 put_disk(new->disk);
451error2:
452 list_del(&new->list);
453error1:
Maxim Levitskya8638622010-02-22 20:39:29 +0200454 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455}
456
457int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
458{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200459 unsigned long flags;
460
Jean Delvareb3561ea2007-05-08 00:30:46 -0700461 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800462 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 BUG();
464 }
465
Maxim Levitsky026ec572010-02-22 20:39:33 +0200466 if (old->disk_attributes)
467 sysfs_remove_group(&disk_to_dev(old->disk)->kobj,
468 old->disk_attributes);
469
Maxim Levitskydba76c02010-07-28 18:53:16 +0300470 /* Stop new requests to arrive */
471 del_gendisk(old->disk);
472
Ezequiel Garcia22a85782012-11-10 13:08:20 -0300473 /* Stop workqueue. This will perform any pending request. */
474 destroy_workqueue(old->wq);
Maxim Levitskya8638622010-02-22 20:39:29 +0200475
Maxim Levitsky048d8712010-02-22 20:39:30 +0200476 /* Kill current requests */
477 spin_lock_irqsave(&old->queue_lock, flags);
478 old->rq->queuedata = NULL;
479 blk_start_queue(old->rq);
480 spin_unlock_irqrestore(&old->queue_lock, flags);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200481
Maxim Levitsky008c7512010-10-15 17:20:43 +0200482 /* If the device is currently open, tell trans driver to close it,
483 then put mtd device, and don't touch it again */
Maxim Levitsky048d8712010-02-22 20:39:30 +0200484 mutex_lock(&old->lock);
Maxim Levitsky008c7512010-10-15 17:20:43 +0200485 if (old->open) {
486 if (old->tr->release)
487 old->tr->release(old);
488 __put_mtd_device(old->mtd);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200489 }
490
Maxim Levitsky048d8712010-02-22 20:39:30 +0200491 old->mtd = NULL;
492
493 mutex_unlock(&old->lock);
494 blktrans_dev_put(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 return 0;
496}
497
498static void blktrans_notify_remove(struct mtd_info *mtd)
499{
Chris Malley71a928c2008-05-19 20:11:50 +0100500 struct mtd_blktrans_ops *tr;
501 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
Chris Malley71a928c2008-05-19 20:11:50 +0100503 list_for_each_entry(tr, &blktrans_majors, list)
504 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (dev->mtd == mtd)
506 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}
508
509static void blktrans_notify_add(struct mtd_info *mtd)
510{
Chris Malley71a928c2008-05-19 20:11:50 +0100511 struct mtd_blktrans_ops *tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 if (mtd->type == MTD_ABSENT)
514 return;
515
Chris Malley71a928c2008-05-19 20:11:50 +0100516 list_for_each_entry(tr, &blktrans_majors, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 tr->add_mtd(tr, mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518}
519
520static struct mtd_notifier blktrans_notifier = {
521 .add = blktrans_notify_add,
522 .remove = blktrans_notify_remove,
523};
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
526{
Ben Hutchingsf1332ba2010-01-29 20:57:11 +0000527 struct mtd_info *mtd;
528 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000530 /* Register the notifier if/when the first device type is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 registered, to prevent the link/init ordering from fucking
532 us over. */
533 if (!blktrans_notifier.list.next)
534 register_mtd_user(&blktrans_notifier);
535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Ingo Molnar48b19262006-03-31 02:29:41 -0800537 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 ret = register_blkdev(tr->major, tr->name);
Frank Li6fe4c592010-10-26 11:02:19 +0800540 if (ret < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
542 tr->name, tr->major, ret);
Ingo Molnar48b19262006-03-31 02:29:41 -0800543 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 return ret;
545 }
David Woodhouseeae9acd2008-08-05 18:08:25 +0100546
Frank Li6fe4c592010-10-26 11:02:19 +0800547 if (ret)
548 tr->major = ret;
549
Richard Purdie19187672006-10-27 09:09:33 +0100550 tr->blkshift = ffs(tr->blksize) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 INIT_LIST_HEAD(&tr->devs);
553 list_add(&tr->list, &blktrans_majors);
554
Ben Hutchingsf1332ba2010-01-29 20:57:11 +0000555 mtd_for_each_device(mtd)
556 if (mtd->type != MTD_ABSENT)
557 tr->add_mtd(tr, mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Ingo Molnar48b19262006-03-31 02:29:41 -0800559 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return 0;
561}
562
563int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr)
564{
Chris Malley71a928c2008-05-19 20:11:50 +0100565 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Ingo Molnar48b19262006-03-31 02:29:41 -0800567 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 /* Remove it from the list of active majors */
570 list_del(&tr->list);
571
Chris Malley71a928c2008-05-19 20:11:50 +0100572 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 unregister_blkdev(tr->major, tr->name);
Ingo Molnar48b19262006-03-31 02:29:41 -0800576 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Eric Sesterhenn373ebfb2006-03-26 18:15:12 +0200578 BUG_ON(!list_empty(&tr->devs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 return 0;
580}
581
582static void __exit mtd_blktrans_exit(void)
583{
584 /* No race here -- if someone's currently in register_mtd_blktrans
585 we're screwed anyway. */
586 if (blktrans_notifier.list.next)
587 unregister_mtd_user(&blktrans_notifier);
588}
589
590module_exit(mtd_blktrans_exit);
591
592EXPORT_SYMBOL_GPL(register_mtd_blktrans);
593EXPORT_SYMBOL_GPL(deregister_mtd_blktrans);
594EXPORT_SYMBOL_GPL(add_mtd_blktrans_dev);
595EXPORT_SYMBOL_GPL(del_mtd_blktrans_dev);
596
597MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
598MODULE_LICENSE("GPL");
599MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'");