blob: 7baba40c1ed225f38921e2143514822080bc67ae [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
David Woodhouseeae9acd2008-08-05 18:08:25 +010035static int blktrans_discard_request(struct request_queue *q,
36 struct request *req)
37{
38 req->cmd_type = REQ_TYPE_LINUX_BLOCK;
39 req->cmd[0] = REQ_LB_OP_DISCARD;
40 return 0;
41}
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043static int do_blktrans_request(struct mtd_blktrans_ops *tr,
44 struct mtd_blktrans_dev *dev,
45 struct request *req)
46{
47 unsigned long block, nsect;
48 char *buf;
49
Tejun Heo83096eb2009-05-07 22:24:39 +090050 block = blk_rq_pos(req) << 9 >> tr->blkshift;
Tejun Heo1011c1b2009-05-07 22:24:45 +090051 nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
Richard Purdie19187672006-10-27 09:09:33 +010052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 buf = req->buffer;
54
David Woodhouseeae9acd2008-08-05 18:08:25 +010055 if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
56 req->cmd[0] == REQ_LB_OP_DISCARD)
Tejun Heof06d9a22009-04-23 11:05:19 +090057 return tr->discard(dev, block, nsect);
David Woodhouseeae9acd2008-08-05 18:08:25 +010058
Jens Axboe4aff5e22006-08-10 08:44:47 +020059 if (!blk_fs_request(req))
Tejun Heof06d9a22009-04-23 11:05:19 +090060 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Tejun Heo83096eb2009-05-07 22:24:39 +090062 if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
63 get_capacity(req->rq_disk))
Tejun Heof06d9a22009-04-23 11:05:19 +090064 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66 switch(rq_data_dir(req)) {
67 case READ:
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->readsect(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 case WRITE:
74 if (!tr->writesect)
Tejun Heof06d9a22009-04-23 11:05:19 +090075 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Richard Purdie19187672006-10-27 09:09:33 +010077 for (; nsect > 0; nsect--, block++, buf += tr->blksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 if (tr->writesect(dev, block, buf))
Tejun Heof06d9a22009-04-23 11:05:19 +090079 return -EIO;
80 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 default:
Jeff Garzik9a292302006-10-01 12:16:00 -040083 printk(KERN_NOTICE "Unknown request %u\n", rq_data_dir(req));
Tejun Heof06d9a22009-04-23 11:05:19 +090084 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
86}
87
88static int mtd_blktrans_thread(void *arg)
89{
90 struct mtd_blktrans_ops *tr = arg;
91 struct request_queue *rq = tr->blkcore_priv->rq;
Tejun Heo1498ada2009-05-08 11:54:11 +090092 struct request *req = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 /* we might get involved when memory gets low, so use PF_MEMALLOC */
Rafael J. Wysocki83144182007-07-17 04:03:35 -070095 current->flags |= PF_MEMALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 spin_lock_irq(rq->queue_lock);
Tejun Heo1498ada2009-05-08 11:54:11 +090098
Christoph Hellwig3e67fe42007-04-22 20:40:57 +010099 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 struct mtd_blktrans_dev *dev;
Tejun Heof06d9a22009-04-23 11:05:19 +0900101 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Tejun Heo9934c8c2009-05-08 11:54:16 +0900103 if (!req && !(req = blk_fetch_request(rq))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 set_current_state(TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 spin_unlock_irq(rq->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 schedule();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 spin_lock_irq(rq->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 continue;
109 }
110
111 dev = req->rq_disk->private_data;
112 tr = dev->tr;
113
114 spin_unlock_irq(rq->queue_lock);
115
Ingo Molnar48b19262006-03-31 02:29:41 -0800116 mutex_lock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 res = do_blktrans_request(tr, dev, req);
Ingo Molnar48b19262006-03-31 02:29:41 -0800118 mutex_unlock(&dev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 spin_lock_irq(rq->queue_lock);
121
Tejun Heo1498ada2009-05-08 11:54:11 +0900122 if (!__blk_end_request_cur(req, res))
123 req = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 }
Tejun Heo1498ada2009-05-08 11:54:11 +0900125
126 if (req)
127 __blk_end_request_all(req, -EIO);
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 spin_unlock_irq(rq->queue_lock);
130
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100131 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
134static void mtd_blktrans_request(struct request_queue *rq)
135{
136 struct mtd_blktrans_ops *tr = rq->queuedata;
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100137 wake_up_process(tr->blkcore_priv->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
140
Al Viroaf0e2a02008-03-02 10:35:06 -0500141static int blktrans_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Al Viroaf0e2a02008-03-02 10:35:06 -0500143 struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
144 struct mtd_blktrans_ops *tr = dev->tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 int ret = -ENODEV;
146
Artem Bityutskiy8022c132009-07-10 17:02:17 +0300147 if (!get_mtd_device(NULL, dev->mtd->index))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 goto out;
149
150 if (!try_module_get(tr->owner))
151 goto out_tr;
152
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000153 /* FIXME: Locking. A hot pluggable device can go away
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 (del_mtd_device can be called for it) without its module
155 being unloaded. */
156 dev->mtd->usecount++;
157
158 ret = 0;
159 if (tr->open && (ret = tr->open(dev))) {
160 dev->mtd->usecount--;
Artem Bityutskiy8022c132009-07-10 17:02:17 +0300161 put_mtd_device(dev->mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 out_tr:
163 module_put(tr->owner);
164 }
165 out:
166 return ret;
167}
168
Al Viroaf0e2a02008-03-02 10:35:06 -0500169static int blktrans_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
Al Viroaf0e2a02008-03-02 10:35:06 -0500171 struct mtd_blktrans_dev *dev = disk->private_data;
172 struct mtd_blktrans_ops *tr = dev->tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 int ret = 0;
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (tr->release)
176 ret = tr->release(dev);
177
178 if (!ret) {
179 dev->mtd->usecount--;
Artem Bityutskiy8022c132009-07-10 17:02:17 +0300180 put_mtd_device(dev->mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 module_put(tr->owner);
182 }
183
184 return ret;
185}
186
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800187static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
188{
189 struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
190
191 if (dev->tr->getgeo)
192 return dev->tr->getgeo(dev, geo);
193 return -ENOTTY;
194}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Al Viroaf0e2a02008-03-02 10:35:06 -0500196static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 unsigned int cmd, unsigned long arg)
198{
Al Viroaf0e2a02008-03-02 10:35:06 -0500199 struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 struct mtd_blktrans_ops *tr = dev->tr;
201
202 switch (cmd) {
203 case BLKFLSBUF:
204 if (tr->flush)
205 return tr->flush(dev);
206 /* The core code did the work, we had nothing to do. */
207 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 default:
209 return -ENOTTY;
210 }
211}
212
Ben Dooks8f026f72007-05-28 19:51:59 +0100213static struct block_device_operations mtd_blktrans_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 .owner = THIS_MODULE,
Al Viroaf0e2a02008-03-02 10:35:06 -0500215 .open = blktrans_open,
216 .release = blktrans_release,
217 .locked_ioctl = blktrans_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800218 .getgeo = blktrans_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219};
220
221int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
222{
223 struct mtd_blktrans_ops *tr = new->tr;
Chris Malley71a928c2008-05-19 20:11:50 +0100224 struct mtd_blktrans_dev *d;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 int last_devnum = -1;
226 struct gendisk *gd;
227
Jean Delvareb3561ea2007-05-08 00:30:46 -0700228 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800229 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 BUG();
231 }
232
Chris Malley71a928c2008-05-19 20:11:50 +0100233 list_for_each_entry(d, &tr->devs, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 if (new->devnum == -1) {
235 /* Use first free number */
236 if (d->devnum != last_devnum+1) {
237 /* Found a free devnum. Plug it in here */
238 new->devnum = last_devnum+1;
239 list_add_tail(&new->list, &d->list);
240 goto added;
241 }
242 } else if (d->devnum == new->devnum) {
243 /* Required number taken */
244 return -EBUSY;
245 } else if (d->devnum > new->devnum) {
246 /* Required number was free */
247 list_add_tail(&new->list, &d->list);
248 goto added;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000249 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 last_devnum = d->devnum;
251 }
252 if (new->devnum == -1)
253 new->devnum = last_devnum+1;
254
255 if ((new->devnum << tr->part_bits) > 256) {
256 return -EBUSY;
257 }
258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 list_add_tail(&new->list, &tr->devs);
260 added:
David Woodhousece37ab42007-12-03 12:46:12 +0000261 mutex_init(&new->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if (!tr->writesect)
263 new->readonly = 1;
264
265 gd = alloc_disk(1 << tr->part_bits);
266 if (!gd) {
267 list_del(&new->list);
268 return -ENOMEM;
269 }
270 gd->major = tr->major;
271 gd->first_minor = (new->devnum) << tr->part_bits;
272 gd->fops = &mtd_blktrans_ops;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000273
Todd Poynor65a8de32005-07-29 20:42:07 +0100274 if (tr->part_bits)
275 if (new->devnum < 26)
276 snprintf(gd->disk_name, sizeof(gd->disk_name),
277 "%s%c", tr->name, 'a' + new->devnum);
278 else
279 snprintf(gd->disk_name, sizeof(gd->disk_name),
280 "%s%c%c", tr->name,
281 'a' - 1 + new->devnum / 26,
282 'a' + new->devnum % 26);
283 else
284 snprintf(gd->disk_name, sizeof(gd->disk_name),
285 "%s%d", tr->name, new->devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 /* 2.5 has capacity in units of 512 bytes while still
288 having BLOCK_SIZE_BITS set to 10. Just to keep us amused. */
Richard Purdie19187672006-10-27 09:09:33 +0100289 set_capacity(gd, (new->size * tr->blksize) >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291 gd->private_data = new;
292 new->blkcore_priv = gd;
293 gd->queue = tr->blkcore_priv->rq;
David Woodhoused6948462009-04-05 07:38:33 -0700294 gd->driverfs_dev = &new->mtd->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 if (new->readonly)
297 set_disk_ro(gd, 1);
298
299 add_disk(gd);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return 0;
302}
303
304int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
305{
Jean Delvareb3561ea2007-05-08 00:30:46 -0700306 if (mutex_trylock(&mtd_table_mutex)) {
Ingo Molnar48b19262006-03-31 02:29:41 -0800307 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 BUG();
309 }
310
311 list_del(&old->list);
312
313 del_gendisk(old->blkcore_priv);
314 put_disk(old->blkcore_priv);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 return 0;
317}
318
319static void blktrans_notify_remove(struct mtd_info *mtd)
320{
Chris Malley71a928c2008-05-19 20:11:50 +0100321 struct mtd_blktrans_ops *tr;
322 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Chris Malley71a928c2008-05-19 20:11:50 +0100324 list_for_each_entry(tr, &blktrans_majors, list)
325 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 if (dev->mtd == mtd)
327 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
330static void blktrans_notify_add(struct mtd_info *mtd)
331{
Chris Malley71a928c2008-05-19 20:11:50 +0100332 struct mtd_blktrans_ops *tr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334 if (mtd->type == MTD_ABSENT)
335 return;
336
Chris Malley71a928c2008-05-19 20:11:50 +0100337 list_for_each_entry(tr, &blktrans_majors, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 tr->add_mtd(tr, mtd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
341static struct mtd_notifier blktrans_notifier = {
342 .add = blktrans_notify_add,
343 .remove = blktrans_notify_remove,
344};
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
347{
348 int ret, i;
349
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000350 /* Register the notifier if/when the first device type is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 registered, to prevent the link/init ordering from fucking
352 us over. */
353 if (!blktrans_notifier.list.next)
354 register_mtd_user(&blktrans_notifier);
355
Burman Yan95b93a02006-11-15 21:10:29 +0200356 tr->blkcore_priv = kzalloc(sizeof(*tr->blkcore_priv), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 if (!tr->blkcore_priv)
358 return -ENOMEM;
359
Ingo Molnar48b19262006-03-31 02:29:41 -0800360 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 ret = register_blkdev(tr->major, tr->name);
363 if (ret) {
364 printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
365 tr->name, tr->major, ret);
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 ret;
369 }
370 spin_lock_init(&tr->blkcore_priv->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 tr->blkcore_priv->rq = blk_init_queue(mtd_blktrans_request, &tr->blkcore_priv->queue_lock);
373 if (!tr->blkcore_priv->rq) {
374 unregister_blkdev(tr->major, tr->name);
375 kfree(tr->blkcore_priv);
Ingo Molnar48b19262006-03-31 02:29:41 -0800376 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return -ENOMEM;
378 }
379
380 tr->blkcore_priv->rq->queuedata = tr;
Martin K. Petersene1defc42009-05-22 17:17:49 -0400381 blk_queue_logical_block_size(tr->blkcore_priv->rq, tr->blksize);
David Woodhouseeae9acd2008-08-05 18:08:25 +0100382 if (tr->discard)
383 blk_queue_set_discard(tr->blkcore_priv->rq,
384 blktrans_discard_request);
385
Richard Purdie19187672006-10-27 09:09:33 +0100386 tr->blkshift = ffs(tr->blksize) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100388 tr->blkcore_priv->thread = kthread_run(mtd_blktrans_thread, tr,
389 "%sd", tr->name);
390 if (IS_ERR(tr->blkcore_priv->thread)) {
Marcin Slusarz2cf3a1142009-03-28 18:44:24 +0100391 int ret = PTR_ERR(tr->blkcore_priv->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 blk_cleanup_queue(tr->blkcore_priv->rq);
393 unregister_blkdev(tr->major, tr->name);
394 kfree(tr->blkcore_priv);
Ingo Molnar48b19262006-03-31 02:29:41 -0800395 mutex_unlock(&mtd_table_mutex);
Marcin Slusarz2cf3a1142009-03-28 18:44:24 +0100396 return ret;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 INIT_LIST_HEAD(&tr->devs);
400 list_add(&tr->list, &blktrans_majors);
401
402 for (i=0; i<MAX_MTD_DEVICES; i++) {
403 if (mtd_table[i] && mtd_table[i]->type != MTD_ABSENT)
404 tr->add_mtd(tr, mtd_table[i]);
405 }
406
Ingo Molnar48b19262006-03-31 02:29:41 -0800407 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 return 0;
410}
411
412int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr)
413{
Chris Malley71a928c2008-05-19 20:11:50 +0100414 struct mtd_blktrans_dev *dev, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Ingo Molnar48b19262006-03-31 02:29:41 -0800416 mutex_lock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 /* Clean up the kernel thread */
Christoph Hellwig3e67fe42007-04-22 20:40:57 +0100419 kthread_stop(tr->blkcore_priv->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421 /* Remove it from the list of active majors */
422 list_del(&tr->list);
423
Chris Malley71a928c2008-05-19 20:11:50 +0100424 list_for_each_entry_safe(dev, next, &tr->devs, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 tr->remove_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 blk_cleanup_queue(tr->blkcore_priv->rq);
428 unregister_blkdev(tr->major, tr->name);
429
Ingo Molnar48b19262006-03-31 02:29:41 -0800430 mutex_unlock(&mtd_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 kfree(tr->blkcore_priv);
433
Eric Sesterhenn373ebfb2006-03-26 18:15:12 +0200434 BUG_ON(!list_empty(&tr->devs));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 return 0;
436}
437
438static void __exit mtd_blktrans_exit(void)
439{
440 /* No race here -- if someone's currently in register_mtd_blktrans
441 we're screwed anyway. */
442 if (blktrans_notifier.list.next)
443 unregister_mtd_user(&blktrans_notifier);
444}
445
446module_exit(mtd_blktrans_exit);
447
448EXPORT_SYMBOL_GPL(register_mtd_blktrans);
449EXPORT_SYMBOL_GPL(deregister_mtd_blktrans);
450EXPORT_SYMBOL_GPL(add_mtd_blktrans_dev);
451EXPORT_SYMBOL_GPL(del_mtd_blktrans_dev);
452
453MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
454MODULE_LICENSE("GPL");
455MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'");