blob: 8ca17a3e96eaa0e85251ecf861d23673b9df3927 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) 2003 David Woodhouse <dwmw2@infradead.org>
3 *
4 * Interface to Linux 2.5 block layer for MTD 'translation layers'.
5 *
6 */
7
8#include <linux/kernel.h>
9#include <linux/slab.h>
10#include <linux/module.h>
11#include <linux/list.h>
12#include <linux/fs.h>
13#include <linux/mtd/blktrans.h>
14#include <linux/mtd/mtd.h>
15#include <linux/blkdev.h>
16#include <linux/blkpg.h>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070017#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/spinlock.h>
19#include <linux/hdreg.h>
20#include <linux/init.h>
Ingo Molnar48b19262006-03-31 02:29:41 -080021#include <linux/mutex.h>
Eric W. Biederman99f9b242007-04-19 01:58:33 -060022#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Ben Dooks356d70f2007-05-28 20:28:34 +010025#include "mtdcore.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Ben Dooks356d70f2007-05-28 20:28:34 +010027static LIST_HEAD(blktrans_majors);
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29struct mtd_blkcore_priv {
Christoph Hellwig3e67fe42007-04-22 20:40:57 +010030 struct task_struct *thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 struct request_queue *rq;
32 spinlock_t queue_lock;
33};
34
35static int do_blktrans_request(struct mtd_blktrans_ops *tr,
36 struct mtd_blktrans_dev *dev,
37 struct request *req)
38{
39 unsigned long block, nsect;
40 char *buf;
41
Tejun Heo83096eb2009-05-07 22:24:39 +090042 block = blk_rq_pos(req) << 9 >> tr->blkshift;
Tejun Heo1011c1b2009-05-07 22:24:45 +090043 nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
Richard Purdie19187672006-10-27 09:09:33 +010044
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 buf = req->buffer;
46
Jens Axboe4aff5e22006-08-10 08:44:47 +020047 if (!blk_fs_request(req))
Tejun Heof06d9a22009-04-23 11:05:19 +090048 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Tejun Heo83096eb2009-05-07 22:24:39 +090050 if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
51 get_capacity(req->rq_disk))
Tejun Heof06d9a22009-04-23 11:05:19 +090052 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Christoph Hellwigc15227d2009-09-30 13:52:12 +020054 if (blk_discard_rq(req))
55 return tr->discard(dev, block, nsect);
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 switch(rq_data_dir(req)) {
58 case READ:
Richard Purdie19187672006-10-27 09:09:33 +010059 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 if (tr->readsect(dev, block, buf))
Tejun Heof06d9a22009-04-23 11:05:19 +090061 return -EIO;
62 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 case WRITE:
65 if (!tr->writesect)
Tejun Heof06d9a22009-04-23 11:05:19 +090066 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Richard Purdie19187672006-10-27 09:09:33 +010068 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 if (tr->writesect(dev, block, buf))
Tejun Heof06d9a22009-04-23 11:05:19 +090070 return -EIO;
71 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73 default:
Jeff Garzik9a292302006-10-01 12:16:00 -040074 printk(KERN_NOTICE "Unknown request %u\n", rq_data_dir(req));
Tejun Heof06d9a22009-04-23 11:05:19 +090075 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 }
77}
78
79static int mtd_blktrans_thread(void *arg)
80{
81 struct mtd_blktrans_ops *tr = arg;
82 struct request_queue *rq = tr->blkcore_priv->rq;
Tejun Heo1498ada2009-05-08 11:54:11 +090083 struct request *req = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85 /* we might get involved when memory gets low, so use PF_MEMALLOC */
Rafael J. Wysocki83144182007-07-17 04:03:35 -070086 current->flags |= PF_MEMALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 spin_lock_irq(rq->queue_lock);
Tejun Heo1498ada2009-05-08 11:54:11 +090089
Christoph Hellwig3e67fe42007-04-22 20:40:57 +010090 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 struct mtd_blktrans_dev *dev;
Tejun Heof06d9a22009-04-23 11:05:19 +090092 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Tejun Heo9934c8c2009-05-08 11:54:16 +090094 if (!req && !(req = blk_fetch_request(rq))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 set_current_state(TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 spin_unlock_irq(rq->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 schedule();
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 spin_lock_irq(rq->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 continue;
100 }
101
102 dev = req->rq_disk->private_data;
103 tr = dev->tr;
104
105 spin_unlock_irq(rq->queue_lock);
106
Ingo Molnar48b19262006-03-31 02:29:41 -0800107 mutex_lock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 res = do_blktrans_request(tr, dev, req);
Ingo Molnar48b19262006-03-31 02:29:41 -0800109 mutex_unlock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 spin_lock_irq(rq->queue_lock);
112
Tejun Heo1498ada2009-05-08 11:54:11 +0900113 if (!__blk_end_request_cur(req, res))
114 req = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
Tejun Heo1498ada2009-05-08 11:54:11 +0900116
117 if (req)
118 __blk_end_request_all(req, -EIO);
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 spin_unlock_irq(rq->queue_lock);
121
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100122 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
125static void mtd_blktrans_request(struct request_queue *rq)
126{
127 struct mtd_blktrans_ops *tr = rq->queuedata;
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100128 wake_up_process(tr->blkcore_priv->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
131
Al Viroaf0e2a02008-03-02 10:35:06 -0500132static int blktrans_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Al Viroaf0e2a02008-03-02 10:35:06 -0500134 struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
135 struct mtd_blktrans_ops *tr = dev->tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 int ret = -ENODEV;
137
Artem Bityutskiy8022c132009-07-10 17:02:17 +0300138 if (!get_mtd_device(NULL, dev->mtd->index))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 goto out;
140
141 if (!try_module_get(tr->owner))
142 goto out_tr;
143
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000144 /* FIXME: Locking. A hot pluggable device can go away
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 (del_mtd_device can be called for it) without its module
146 being unloaded. */
147 dev->mtd->usecount++;
148
149 ret = 0;
150 if (tr->open && (ret = tr->open(dev))) {
151 dev->mtd->usecount--;
Artem Bityutskiy8022c132009-07-10 17:02:17 +0300152 put_mtd_device(dev->mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 out_tr:
154 module_put(tr->owner);
155 }
156 out:
157 return ret;
158}
159
Al Viroaf0e2a02008-03-02 10:35:06 -0500160static int blktrans_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Al Viroaf0e2a02008-03-02 10:35:06 -0500162 struct mtd_blktrans_dev *dev = disk->private_data;
163 struct mtd_blktrans_ops *tr = dev->tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 int ret = 0;
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (tr->release)
167 ret = tr->release(dev);
168
169 if (!ret) {
170 dev->mtd->usecount--;
Artem Bityutskiy8022c132009-07-10 17:02:17 +0300171 put_mtd_device(dev->mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 module_put(tr->owner);
173 }
174
175 return ret;
176}
177
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800178static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
179{
180 struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
181
182 if (dev->tr->getgeo)
183 return dev->tr->getgeo(dev, geo);
184 return -ENOTTY;
185}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Al Viroaf0e2a02008-03-02 10:35:06 -0500187static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 unsigned int cmd, unsigned long arg)
189{
Al Viroaf0e2a02008-03-02 10:35:06 -0500190 struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 struct mtd_blktrans_ops *tr = dev->tr;
192
193 switch (cmd) {
194 case BLKFLSBUF:
195 if (tr->flush)
196 return tr->flush(dev);
197 /* The core code did the work, we had nothing to do. */
198 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 default:
200 return -ENOTTY;
201 }
202}
203
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700204static const struct block_device_operations mtd_blktrans_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 .owner = THIS_MODULE,
Al Viroaf0e2a02008-03-02 10:35:06 -0500206 .open = blktrans_open,
207 .release = blktrans_release,
208 .locked_ioctl = blktrans_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800209 .getgeo = blktrans_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210};
211
212int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
213{
214 struct mtd_blktrans_ops *tr = new->tr;
Chris Malley71a928c2008-05-19 20:11:50 +0100215 struct mtd_blktrans_dev *d;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 int last_devnum = -1;
217 struct gendisk *gd;
218
Jean Delvareb3561ea2007-05-08 00:30:46 -0700219 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800220 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 BUG();
222 }
223
Chris Malley71a928c2008-05-19 20:11:50 +0100224 list_for_each_entry(d, &tr->devs, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 if (new->devnum == -1) {
226 /* Use first free number */
227 if (d->devnum != last_devnum+1) {
228 /* Found a free devnum. Plug it in here */
229 new->devnum = last_devnum+1;
230 list_add_tail(&new->list, &d->list);
231 goto added;
232 }
233 } else if (d->devnum == new->devnum) {
234 /* Required number taken */
235 return -EBUSY;
236 } else if (d->devnum > new->devnum) {
237 /* Required number was free */
238 list_add_tail(&new->list, &d->list);
239 goto added;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000240 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 last_devnum = d->devnum;
242 }
243 if (new->devnum == -1)
244 new->devnum = last_devnum+1;
245
246 if ((new->devnum << tr->part_bits) > 256) {
247 return -EBUSY;
248 }
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 list_add_tail(&new->list, &tr->devs);
251 added:
David Woodhousece37ab42007-12-03 12:46:12 +0000252 mutex_init(&new->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (!tr->writesect)
254 new->readonly = 1;
255
256 gd = alloc_disk(1 << tr->part_bits);
257 if (!gd) {
258 list_del(&new->list);
259 return -ENOMEM;
260 }
261 gd->major = tr->major;
262 gd->first_minor = (new->devnum) << tr->part_bits;
263 gd->fops = &mtd_blktrans_ops;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000264
Todd Poynor65a8de32005-07-29 20:42:07 +0100265 if (tr->part_bits)
266 if (new->devnum < 26)
267 snprintf(gd->disk_name, sizeof(gd->disk_name),
268 "%s%c", tr->name, 'a' + new->devnum);
269 else
270 snprintf(gd->disk_name, sizeof(gd->disk_name),
271 "%s%c%c", tr->name,
272 'a' - 1 + new->devnum / 26,
273 'a' + new->devnum % 26);
274 else
275 snprintf(gd->disk_name, sizeof(gd->disk_name),
276 "%s%d", tr->name, new->devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278 /* 2.5 has capacity in units of 512 bytes while still
279 having BLOCK_SIZE_BITS set to 10. Just to keep us amused. */
Richard Purdie19187672006-10-27 09:09:33 +0100280 set_capacity(gd, (new->size * tr->blksize) >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282 gd->private_data = new;
283 new->blkcore_priv = gd;
284 gd->queue = tr->blkcore_priv->rq;
David Woodhoused6948462009-04-05 07:38:33 -0700285 gd->driverfs_dev = &new->mtd->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 if (new->readonly)
288 set_disk_ro(gd, 1);
289
290 add_disk(gd);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 return 0;
293}
294
295int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
296{
Jean Delvareb3561ea2007-05-08 00:30:46 -0700297 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800298 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 BUG();
300 }
301
302 list_del(&old->list);
303
304 del_gendisk(old->blkcore_priv);
305 put_disk(old->blkcore_priv);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return 0;
308}
309
310static void blktrans_notify_remove(struct mtd_info *mtd)
311{
Chris Malley71a928c2008-05-19 20:11:50 +0100312 struct mtd_blktrans_ops *tr;
313 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Chris Malley71a928c2008-05-19 20:11:50 +0100315 list_for_each_entry(tr, &blktrans_majors, list)
316 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 if (dev->mtd == mtd)
318 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
320
321static void blktrans_notify_add(struct mtd_info *mtd)
322{
Chris Malley71a928c2008-05-19 20:11:50 +0100323 struct mtd_blktrans_ops *tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325 if (mtd->type == MTD_ABSENT)
326 return;
327
Chris Malley71a928c2008-05-19 20:11:50 +0100328 list_for_each_entry(tr, &blktrans_majors, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 tr->add_mtd(tr, mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
332static struct mtd_notifier blktrans_notifier = {
333 .add = blktrans_notify_add,
334 .remove = blktrans_notify_remove,
335};
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
338{
339 int ret, i;
340
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000341 /* Register the notifier if/when the first device type is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 registered, to prevent the link/init ordering from fucking
343 us over. */
344 if (!blktrans_notifier.list.next)
345 register_mtd_user(&blktrans_notifier);
346
Burman Yan95b93a02006-11-15 21:10:29 +0200347 tr->blkcore_priv = kzalloc(sizeof(*tr->blkcore_priv), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 if (!tr->blkcore_priv)
349 return -ENOMEM;
350
Ingo Molnar48b19262006-03-31 02:29:41 -0800351 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353 ret = register_blkdev(tr->major, tr->name);
354 if (ret) {
355 printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
356 tr->name, tr->major, ret);
357 kfree(tr->blkcore_priv);
Ingo Molnar48b19262006-03-31 02:29:41 -0800358 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 return ret;
360 }
361 spin_lock_init(&tr->blkcore_priv->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 tr->blkcore_priv->rq = blk_init_queue(mtd_blktrans_request, &tr->blkcore_priv->queue_lock);
364 if (!tr->blkcore_priv->rq) {
365 unregister_blkdev(tr->major, tr->name);
366 kfree(tr->blkcore_priv);
Ingo Molnar48b19262006-03-31 02:29:41 -0800367 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return -ENOMEM;
369 }
370
371 tr->blkcore_priv->rq->queuedata = tr;
Martin K. Petersene1defc42009-05-22 17:17:49 -0400372 blk_queue_logical_block_size(tr->blkcore_priv->rq, tr->blksize);
David Woodhouseeae9acd2008-08-05 18:08:25 +0100373 if (tr->discard)
Christoph Hellwigc15227d2009-09-30 13:52:12 +0200374 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
375 tr->blkcore_priv->rq);
David Woodhouseeae9acd2008-08-05 18:08:25 +0100376
Richard Purdie19187672006-10-27 09:09:33 +0100377 tr->blkshift = ffs(tr->blksize) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100379 tr->blkcore_priv->thread = kthread_run(mtd_blktrans_thread, tr,
380 "%sd", tr->name);
381 if (IS_ERR(tr->blkcore_priv->thread)) {
Marcin Slusarz2cf3a1142009-03-28 18:44:24 +0100382 int ret = PTR_ERR(tr->blkcore_priv->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 blk_cleanup_queue(tr->blkcore_priv->rq);
384 unregister_blkdev(tr->major, tr->name);
385 kfree(tr->blkcore_priv);
Ingo Molnar48b19262006-03-31 02:29:41 -0800386 mutex_unlock(&mtd_table_mutex);
Marcin Slusarz2cf3a1142009-03-28 18:44:24 +0100387 return ret;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000388 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 INIT_LIST_HEAD(&tr->devs);
391 list_add(&tr->list, &blktrans_majors);
392
393 for (i=0; i<MAX_MTD_DEVICES; i++) {
394 if (mtd_table[i] && mtd_table[i]->type != MTD_ABSENT)
395 tr->add_mtd(tr, mtd_table[i]);
396 }
397
Ingo Molnar48b19262006-03-31 02:29:41 -0800398 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 return 0;
401}
402
403int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr)
404{
Chris Malley71a928c2008-05-19 20:11:50 +0100405 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Ingo Molnar48b19262006-03-31 02:29:41 -0800407 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 /* Clean up the kernel thread */
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100410 kthread_stop(tr->blkcore_priv->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 /* Remove it from the list of active majors */
413 list_del(&tr->list);
414
Chris Malley71a928c2008-05-19 20:11:50 +0100415 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 blk_cleanup_queue(tr->blkcore_priv->rq);
419 unregister_blkdev(tr->major, tr->name);
420
Ingo Molnar48b19262006-03-31 02:29:41 -0800421 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423 kfree(tr->blkcore_priv);
424
Eric Sesterhenn373ebfb2006-03-26 18:15:12 +0200425 BUG_ON(!list_empty(&tr->devs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 return 0;
427}
428
429static void __exit mtd_blktrans_exit(void)
430{
431 /* No race here -- if someone's currently in register_mtd_blktrans
432 we're screwed anyway. */
433 if (blktrans_notifier.list.next)
434 unregister_mtd_user(&blktrans_notifier);
435}
436
437module_exit(mtd_blktrans_exit);
438
439EXPORT_SYMBOL_GPL(register_mtd_blktrans);
440EXPORT_SYMBOL_GPL(deregister_mtd_blktrans);
441EXPORT_SYMBOL_GPL(add_mtd_blktrans_dev);
442EXPORT_SYMBOL_GPL(del_mtd_blktrans_dev);
443
444MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
445MODULE_LICENSE("GPL");
446MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'");