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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>
33#include <linux/init.h>
Ingo Molnar48b19262006-03-31 02:29:41 -080034#include <linux/mutex.h>
Eric W. Biederman99f9b242007-04-19 01:58:33 -060035#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Ben Dooks356d70f2007-05-28 20:28:34 +010038#include "mtdcore.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Ben Dooks356d70f2007-05-28 20:28:34 +010040static LIST_HEAD(blktrans_majors);
Maxim Levitsky048d8712010-02-22 20:39:30 +020041static DEFINE_MUTEX(blktrans_ref_mutex);
42
H Hartley Sweeten7f53f122011-01-11 18:46:10 -060043static void blktrans_dev_release(struct kref *kref)
Maxim Levitsky048d8712010-02-22 20:39:30 +020044{
45 struct mtd_blktrans_dev *dev =
46 container_of(kref, struct mtd_blktrans_dev, ref);
47
48 dev->disk->private_data = NULL;
Maxim Levitskye4d64ca2010-02-27 02:31:51 +020049 blk_cleanup_queue(dev->rq);
Maxim Levitsky048d8712010-02-22 20:39:30 +020050 put_disk(dev->disk);
51 list_del(&dev->list);
52 kfree(dev);
53}
54
55static struct mtd_blktrans_dev *blktrans_dev_get(struct gendisk *disk)
56{
57 struct mtd_blktrans_dev *dev;
58
59 mutex_lock(&blktrans_ref_mutex);
60 dev = disk->private_data;
61
62 if (!dev)
63 goto unlock;
64 kref_get(&dev->ref);
65unlock:
66 mutex_unlock(&blktrans_ref_mutex);
67 return dev;
68}
69
H Hartley Sweeten7f53f122011-01-11 18:46:10 -060070static void blktrans_dev_put(struct mtd_blktrans_dev *dev)
Maxim Levitsky048d8712010-02-22 20:39:30 +020071{
72 mutex_lock(&blktrans_ref_mutex);
73 kref_put(&dev->ref, blktrans_dev_release);
74 mutex_unlock(&blktrans_ref_mutex);
75}
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78static int do_blktrans_request(struct mtd_blktrans_ops *tr,
79 struct mtd_blktrans_dev *dev,
80 struct request *req)
81{
82 unsigned long block, nsect;
83 char *buf;
84
Tejun Heo83096eb2009-05-07 22:24:39 +090085 block = blk_rq_pos(req) << 9 >> tr->blkshift;
Tejun Heo1011c1b2009-05-07 22:24:45 +090086 nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
Richard Purdie19187672006-10-27 09:09:33 +010087
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 buf = req->buffer;
89
Christoph Hellwig33659eb2010-08-07 18:17:56 +020090 if (req->cmd_type != REQ_TYPE_FS)
Tejun Heof06d9a22009-04-23 11:05:19 +090091 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 switch(rq_data_dir(req)) {
101 case READ:
Richard Purdie19187672006-10-27 09:09:33 +0100102 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (tr->readsect(dev, block, buf))
Tejun Heof06d9a22009-04-23 11:05:19 +0900104 return -EIO;
Ilya Loginov2d4dc892009-11-26 09:16:19 +0100105 rq_flush_dcache_pages(req);
Tejun Heof06d9a22009-04-23 11:05:19 +0900106 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 case WRITE:
108 if (!tr->writesect)
Tejun Heof06d9a22009-04-23 11:05:19 +0900109 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Ilya Loginov2d4dc892009-11-26 09:16:19 +0100111 rq_flush_dcache_pages(req);
Richard Purdie19187672006-10-27 09:09:33 +0100112 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if (tr->writesect(dev, block, buf))
Tejun Heof06d9a22009-04-23 11:05:19 +0900114 return -EIO;
115 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 default:
Jeff Garzik9a292302006-10-01 12:16:00 -0400117 printk(KERN_NOTICE "Unknown request %u\n", rq_data_dir(req));
Tejun Heof06d9a22009-04-23 11:05:19 +0900118 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 }
120}
121
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200122int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev)
123{
124 if (kthread_should_stop())
125 return 1;
126
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200127 return dev->bg_stop;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200128}
129EXPORT_SYMBOL_GPL(mtd_blktrans_cease_background);
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131static int mtd_blktrans_thread(void *arg)
132{
Maxim Levitskya8638622010-02-22 20:39:29 +0200133 struct mtd_blktrans_dev *dev = arg;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200134 struct mtd_blktrans_ops *tr = dev->tr;
Maxim Levitskya8638622010-02-22 20:39:29 +0200135 struct request_queue *rq = dev->rq;
Tejun Heo1498ada2009-05-08 11:54:11 +0900136 struct request *req = NULL;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200137 int background_done = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 spin_lock_irq(rq->queue_lock);
Tejun Heo1498ada2009-05-08 11:54:11 +0900140
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100141 while (!kthread_should_stop()) {
Tejun Heof06d9a22009-04-23 11:05:19 +0900142 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200144 dev->bg_stop = false;
Tejun Heo9934c8c2009-05-08 11:54:16 +0900145 if (!req && !(req = blk_fetch_request(rq))) {
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200146 if (tr->background && !background_done) {
147 spin_unlock_irq(rq->queue_lock);
148 mutex_lock(&dev->lock);
149 tr->background(dev);
150 mutex_unlock(&dev->lock);
151 spin_lock_irq(rq->queue_lock);
152 /*
153 * Do background processing just once per idle
154 * period.
155 */
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200156 background_done = !dev->bg_stop;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200157 continue;
158 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 set_current_state(TASK_INTERRUPTIBLE);
Maxim Levitsky12aebf32010-10-15 17:20:45 +0200160
161 if (kthread_should_stop())
162 set_current_state(TASK_RUNNING);
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 spin_unlock_irq(rq->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 schedule();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 spin_lock_irq(rq->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 continue;
168 }
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 spin_unlock_irq(rq->queue_lock);
171
Ingo Molnar48b19262006-03-31 02:29:41 -0800172 mutex_lock(&dev->lock);
Maxim Levitskya8638622010-02-22 20:39:29 +0200173 res = do_blktrans_request(dev->tr, dev, req);
Ingo Molnar48b19262006-03-31 02:29:41 -0800174 mutex_unlock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 spin_lock_irq(rq->queue_lock);
177
Tejun Heo1498ada2009-05-08 11:54:11 +0900178 if (!__blk_end_request_cur(req, res))
179 req = NULL;
Jarkko Lavinenc7519db2011-02-14 16:16:09 +0200180
181 background_done = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 }
Tejun Heo1498ada2009-05-08 11:54:11 +0900183
184 if (req)
185 __blk_end_request_all(req, -EIO);
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 spin_unlock_irq(rq->queue_lock);
188
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100189 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192static void mtd_blktrans_request(struct request_queue *rq)
193{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200194 struct mtd_blktrans_dev *dev;
195 struct request *req = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Maxim Levitsky048d8712010-02-22 20:39:30 +0200197 dev = rq->queuedata;
198
199 if (!dev)
200 while ((req = blk_fetch_request(rq)) != NULL)
201 __blk_end_request_all(req, -ENODEV);
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200202 else {
203 dev->bg_stop = true;
Maxim Levitsky048d8712010-02-22 20:39:30 +0200204 wake_up_process(dev->thread);
Artem Bityutskiy7bf7e372011-03-25 17:41:20 +0200205 }
Maxim Levitsky048d8712010-02-22 20:39:30 +0200206}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Al Viroaf0e2a02008-03-02 10:35:06 -0500208static int blktrans_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200210 struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
Maxim Levitsky008c7512010-10-15 17:20:43 +0200211 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Maxim Levitsky048d8712010-02-22 20:39:30 +0200213 if (!dev)
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200214 return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Maxim Levitsky048d8712010-02-22 20:39:30 +0200216 mutex_lock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Brian Norris342ff282011-11-07 15:51:05 -0800218 if (dev->open)
Maxim Levitsky048d8712010-02-22 20:39:30 +0200219 goto unlock;
Maxim Levitsky008c7512010-10-15 17:20:43 +0200220
221 kref_get(&dev->ref);
222 __module_get(dev->tr->owner);
223
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300224 if (!dev->mtd)
225 goto unlock;
226
227 if (dev->tr->open) {
228 ret = dev->tr->open(dev);
229 if (ret)
230 goto error_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
Maxim Levitsky048d8712010-02-22 20:39:30 +0200232
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300233 ret = __get_mtd_device(dev->mtd);
234 if (ret)
235 goto error_release;
Alexander Stein70d50982012-01-10 13:26:58 +0100236 dev->file_mode = mode;
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300237
Maxim Levitsky048d8712010-02-22 20:39:30 +0200238unlock:
Brian Norris342ff282011-11-07 15:51:05 -0800239 dev->open++;
Maxim Levitsky048d8712010-02-22 20:39:30 +0200240 mutex_unlock(&dev->lock);
241 blktrans_dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return ret;
Artem Bityutskiy94735ec2011-04-18 07:50:37 +0300243
244error_release:
245 if (dev->tr->release)
246 dev->tr->release(dev);
247error_put:
248 module_put(dev->tr->owner);
249 kref_put(&dev->ref, blktrans_dev_release);
250 mutex_unlock(&dev->lock);
251 blktrans_dev_put(dev);
252 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
Al Viroaf0e2a02008-03-02 10:35:06 -0500255static int blktrans_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200257 struct mtd_blktrans_dev *dev = blktrans_dev_get(disk);
Maxim Levitsky008c7512010-10-15 17:20:43 +0200258 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Maxim Levitsky048d8712010-02-22 20:39:30 +0200260 if (!dev)
261 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Maxim Levitsky048d8712010-02-22 20:39:30 +0200263 mutex_lock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Maxim Levitsky008c7512010-10-15 17:20:43 +0200265 if (--dev->open)
Maxim Levitsky048d8712010-02-22 20:39:30 +0200266 goto unlock;
267
Maxim Levitsky008c7512010-10-15 17:20:43 +0200268 kref_put(&dev->ref, blktrans_dev_release);
269 module_put(dev->tr->owner);
270
271 if (dev->mtd) {
272 ret = dev->tr->release ? dev->tr->release(dev) : 0;
273 __put_mtd_device(dev->mtd);
274 }
Maxim Levitsky048d8712010-02-22 20:39:30 +0200275unlock:
276 mutex_unlock(&dev->lock);
277 blktrans_dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 return ret;
279}
280
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800281static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
282{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200283 struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
284 int ret = -ENXIO;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800285
Maxim Levitsky048d8712010-02-22 20:39:30 +0200286 if (!dev)
287 return ret;
288
289 mutex_lock(&dev->lock);
290
291 if (!dev->mtd)
292 goto unlock;
293
294 ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : 0;
295unlock:
296 mutex_unlock(&dev->lock);
297 blktrans_dev_put(dev);
298 return ret;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800299}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Al Viroaf0e2a02008-03-02 10:35:06 -0500301static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 unsigned int cmd, unsigned long arg)
303{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200304 struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
305 int ret = -ENXIO;
306
307 if (!dev)
308 return ret;
309
310 mutex_lock(&dev->lock);
311
312 if (!dev->mtd)
313 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 switch (cmd) {
316 case BLKFLSBUF:
Maxim Levitsky048d8712010-02-22 20:39:30 +0200317 ret = dev->tr->flush ? dev->tr->flush(dev) : 0;
Dan Carpenter007c2d82010-05-31 16:03:38 +0200318 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 default:
Maxim Levitsky048d8712010-02-22 20:39:30 +0200320 ret = -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 }
Maxim Levitsky048d8712010-02-22 20:39:30 +0200322unlock:
323 mutex_unlock(&dev->lock);
324 blktrans_dev_put(dev);
325 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700328static const struct block_device_operations mtd_blktrans_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 .owner = THIS_MODULE,
Al Viroaf0e2a02008-03-02 10:35:06 -0500330 .open = blktrans_open,
331 .release = blktrans_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200332 .ioctl = blktrans_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800333 .getgeo = blktrans_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334};
335
336int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
337{
338 struct mtd_blktrans_ops *tr = new->tr;
Chris Malley71a928c2008-05-19 20:11:50 +0100339 struct mtd_blktrans_dev *d;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 int last_devnum = -1;
341 struct gendisk *gd;
Maxim Levitskya8638622010-02-22 20:39:29 +0200342 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Jean Delvareb3561ea2007-05-08 00:30:46 -0700344 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800345 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 BUG();
347 }
348
Maxim Levitsky048d8712010-02-22 20:39:30 +0200349 mutex_lock(&blktrans_ref_mutex);
Chris Malley71a928c2008-05-19 20:11:50 +0100350 list_for_each_entry(d, &tr->devs, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (new->devnum == -1) {
352 /* Use first free number */
353 if (d->devnum != last_devnum+1) {
354 /* Found a free devnum. Plug it in here */
355 new->devnum = last_devnum+1;
356 list_add_tail(&new->list, &d->list);
357 goto added;
358 }
359 } else if (d->devnum == new->devnum) {
360 /* Required number taken */
Maxim Levitsky048d8712010-02-22 20:39:30 +0200361 mutex_unlock(&blktrans_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 return -EBUSY;
363 } else if (d->devnum > new->devnum) {
364 /* Required number was free */
365 list_add_tail(&new->list, &d->list);
366 goto added;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000367 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 last_devnum = d->devnum;
369 }
Maxim Levitskya8638622010-02-22 20:39:29 +0200370
371 ret = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (new->devnum == -1)
373 new->devnum = last_devnum+1;
374
Ben Hutchings4d3a8532010-01-29 20:59:53 +0000375 /* Check that the device and any partitions will get valid
376 * minor numbers and that the disk naming code below can cope
377 * with this number. */
378 if (new->devnum > (MINORMASK >> tr->part_bits) ||
Maxim Levitsky048d8712010-02-22 20:39:30 +0200379 (tr->part_bits && new->devnum >= 27 * 26)) {
380 mutex_unlock(&blktrans_ref_mutex);
Maxim Levitskya8638622010-02-22 20:39:29 +0200381 goto error1;
Maxim Levitsky048d8712010-02-22 20:39:30 +0200382 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 list_add_tail(&new->list, &tr->devs);
385 added:
Maxim Levitsky048d8712010-02-22 20:39:30 +0200386 mutex_unlock(&blktrans_ref_mutex);
387
David Woodhousece37ab42007-12-03 12:46:12 +0000388 mutex_init(&new->lock);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200389 kref_init(&new->ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 if (!tr->writesect)
391 new->readonly = 1;
392
Maxim Levitskya8638622010-02-22 20:39:29 +0200393 /* Create gendisk */
394 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 gd = alloc_disk(1 << tr->part_bits);
Maxim Levitskya8638622010-02-22 20:39:29 +0200396
397 if (!gd)
398 goto error2;
399
400 new->disk = gd;
401 gd->private_data = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 gd->major = tr->major;
403 gd->first_minor = (new->devnum) << tr->part_bits;
404 gd->fops = &mtd_blktrans_ops;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000405
Todd Poynor65a8de32005-07-29 20:42:07 +0100406 if (tr->part_bits)
407 if (new->devnum < 26)
408 snprintf(gd->disk_name, sizeof(gd->disk_name),
409 "%s%c", tr->name, 'a' + new->devnum);
410 else
411 snprintf(gd->disk_name, sizeof(gd->disk_name),
412 "%s%c%c", tr->name,
413 'a' - 1 + new->devnum / 26,
414 'a' + new->devnum % 26);
415 else
416 snprintf(gd->disk_name, sizeof(gd->disk_name),
417 "%s%d", tr->name, new->devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
Richard Purdie19187672006-10-27 09:09:33 +0100419 set_capacity(gd, (new->size * tr->blksize) >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Maxim Levitskya8638622010-02-22 20:39:29 +0200421 /* Create the request queue */
422 spin_lock_init(&new->queue_lock);
423 new->rq = blk_init_queue(mtd_blktrans_request, &new->queue_lock);
424
425 if (!new->rq)
426 goto error3;
427
428 new->rq->queuedata = new;
429 blk_queue_logical_block_size(new->rq, tr->blksize);
430
Dan McGee16f7eca2011-09-28 00:21:42 -0500431 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, new->rq);
432
Jarkko Lavinen115ee882011-02-14 16:16:10 +0200433 if (tr->discard) {
434 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq);
435 new->rq->limits.max_discard_sectors = UINT_MAX;
436 }
Maxim Levitskya8638622010-02-22 20:39:29 +0200437
438 gd->queue = new->rq;
439
440 /* Create processing thread */
441 /* TODO: workqueue ? */
442 new->thread = kthread_run(mtd_blktrans_thread, new,
443 "%s%d", tr->name, new->mtd->index);
444 if (IS_ERR(new->thread)) {
445 ret = PTR_ERR(new->thread);
446 goto error4;
447 }
David Woodhoused6948462009-04-05 07:38:33 -0700448 gd->driverfs_dev = &new->mtd->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 if (new->readonly)
451 set_disk_ro(gd, 1);
452
453 add_disk(gd);
Maxim Levitsky026ec572010-02-22 20:39:33 +0200454
Maxim Levitsky133fa8c2010-02-26 22:08:40 +0200455 if (new->disk_attributes) {
456 ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
Maxim Levitsky026ec572010-02-22 20:39:33 +0200457 new->disk_attributes);
Maxim Levitsky133fa8c2010-02-26 22:08:40 +0200458 WARN_ON(ret);
459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 return 0;
Maxim Levitskya8638622010-02-22 20:39:29 +0200461error4:
462 blk_cleanup_queue(new->rq);
463error3:
464 put_disk(new->disk);
465error2:
466 list_del(&new->list);
467error1:
Maxim Levitskya8638622010-02-22 20:39:29 +0200468 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470
471int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
472{
Maxim Levitsky048d8712010-02-22 20:39:30 +0200473 unsigned long flags;
474
Jean Delvareb3561ea2007-05-08 00:30:46 -0700475 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800476 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 BUG();
478 }
479
Maxim Levitsky026ec572010-02-22 20:39:33 +0200480 if (old->disk_attributes)
481 sysfs_remove_group(&disk_to_dev(old->disk)->kobj,
482 old->disk_attributes);
483
Maxim Levitskydba76c02010-07-28 18:53:16 +0300484 /* Stop new requests to arrive */
485 del_gendisk(old->disk);
486
487
Maxim Levitskya8638622010-02-22 20:39:29 +0200488 /* Stop the thread */
489 kthread_stop(old->thread);
490
Maxim Levitsky048d8712010-02-22 20:39:30 +0200491 /* Kill current requests */
492 spin_lock_irqsave(&old->queue_lock, flags);
493 old->rq->queuedata = NULL;
494 blk_start_queue(old->rq);
495 spin_unlock_irqrestore(&old->queue_lock, flags);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200496
Maxim Levitsky008c7512010-10-15 17:20:43 +0200497 /* If the device is currently open, tell trans driver to close it,
498 then put mtd device, and don't touch it again */
Maxim Levitsky048d8712010-02-22 20:39:30 +0200499 mutex_lock(&old->lock);
Maxim Levitsky008c7512010-10-15 17:20:43 +0200500 if (old->open) {
501 if (old->tr->release)
502 old->tr->release(old);
503 __put_mtd_device(old->mtd);
Maxim Levitsky048d8712010-02-22 20:39:30 +0200504 }
505
Maxim Levitsky048d8712010-02-22 20:39:30 +0200506 old->mtd = NULL;
507
508 mutex_unlock(&old->lock);
509 blktrans_dev_put(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return 0;
511}
512
513static void blktrans_notify_remove(struct mtd_info *mtd)
514{
Chris Malley71a928c2008-05-19 20:11:50 +0100515 struct mtd_blktrans_ops *tr;
516 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Chris Malley71a928c2008-05-19 20:11:50 +0100518 list_for_each_entry(tr, &blktrans_majors, list)
519 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (dev->mtd == mtd)
521 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522}
523
524static void blktrans_notify_add(struct mtd_info *mtd)
525{
Chris Malley71a928c2008-05-19 20:11:50 +0100526 struct mtd_blktrans_ops *tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 if (mtd->type == MTD_ABSENT)
529 return;
530
Chris Malley71a928c2008-05-19 20:11:50 +0100531 list_for_each_entry(tr, &blktrans_majors, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 tr->add_mtd(tr, mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533}
534
535static struct mtd_notifier blktrans_notifier = {
536 .add = blktrans_notify_add,
537 .remove = blktrans_notify_remove,
538};
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
541{
Ben Hutchingsf1332ba2010-01-29 20:57:11 +0000542 struct mtd_info *mtd;
543 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000545 /* Register the notifier if/when the first device type is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 registered, to prevent the link/init ordering from fucking
547 us over. */
548 if (!blktrans_notifier.list.next)
549 register_mtd_user(&blktrans_notifier);
550
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Ingo Molnar48b19262006-03-31 02:29:41 -0800552 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554 ret = register_blkdev(tr->major, tr->name);
Frank Li6fe4c592010-10-26 11:02:19 +0800555 if (ret < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
557 tr->name, tr->major, ret);
Ingo Molnar48b19262006-03-31 02:29:41 -0800558 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 return ret;
560 }
David Woodhouseeae9acd2008-08-05 18:08:25 +0100561
Frank Li6fe4c592010-10-26 11:02:19 +0800562 if (ret)
563 tr->major = ret;
564
Richard Purdie19187672006-10-27 09:09:33 +0100565 tr->blkshift = ffs(tr->blksize) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 INIT_LIST_HEAD(&tr->devs);
568 list_add(&tr->list, &blktrans_majors);
569
Ben Hutchingsf1332ba2010-01-29 20:57:11 +0000570 mtd_for_each_device(mtd)
571 if (mtd->type != MTD_ABSENT)
572 tr->add_mtd(tr, mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Ingo Molnar48b19262006-03-31 02:29:41 -0800574 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 return 0;
576}
577
578int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr)
579{
Chris Malley71a928c2008-05-19 20:11:50 +0100580 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Ingo Molnar48b19262006-03-31 02:29:41 -0800582 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 /* Remove it from the list of active majors */
585 list_del(&tr->list);
586
Chris Malley71a928c2008-05-19 20:11:50 +0100587 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 unregister_blkdev(tr->major, tr->name);
Ingo Molnar48b19262006-03-31 02:29:41 -0800591 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Eric Sesterhenn373ebfb2006-03-26 18:15:12 +0200593 BUG_ON(!list_empty(&tr->devs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 return 0;
595}
596
597static void __exit mtd_blktrans_exit(void)
598{
599 /* No race here -- if someone's currently in register_mtd_blktrans
600 we're screwed anyway. */
601 if (blktrans_notifier.list.next)
602 unregister_mtd_user(&blktrans_notifier);
603}
604
605module_exit(mtd_blktrans_exit);
606
607EXPORT_SYMBOL_GPL(register_mtd_blktrans);
608EXPORT_SYMBOL_GPL(deregister_mtd_blktrans);
609EXPORT_SYMBOL_GPL(add_mtd_blktrans_dev);
610EXPORT_SYMBOL_GPL(del_mtd_blktrans_dev);
611
612MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
613MODULE_LICENSE("GPL");
614MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'");