Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
David Woodhouse | a1452a3 | 2010-08-08 20:58:20 +0100 | [diff] [blame] | 2 | * Interface to Linux block layer for MTD 'translation layers'. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
David Woodhouse | a1452a3 | 2010-08-08 20:58:20 +0100 | [diff] [blame] | 4 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * |
| 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 Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 33 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Ben Dooks | 356d70f | 2007-05-28 20:28:34 +0100 | [diff] [blame] | 36 | #include "mtdcore.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Ben Dooks | 356d70f | 2007-05-28 20:28:34 +0100 | [diff] [blame] | 38 | static LIST_HEAD(blktrans_majors); |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 39 | static DEFINE_MUTEX(blktrans_ref_mutex); |
| 40 | |
H Hartley Sweeten | 7f53f12 | 2011-01-11 18:46:10 -0600 | [diff] [blame] | 41 | static void blktrans_dev_release(struct kref *kref) |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 42 | { |
| 43 | struct mtd_blktrans_dev *dev = |
| 44 | container_of(kref, struct mtd_blktrans_dev, ref); |
| 45 | |
| 46 | dev->disk->private_data = NULL; |
Maxim Levitsky | e4d64ca | 2010-02-27 02:31:51 +0200 | [diff] [blame] | 47 | blk_cleanup_queue(dev->rq); |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 48 | put_disk(dev->disk); |
| 49 | list_del(&dev->list); |
| 50 | kfree(dev); |
| 51 | } |
| 52 | |
| 53 | static 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); |
| 63 | unlock: |
| 64 | mutex_unlock(&blktrans_ref_mutex); |
| 65 | return dev; |
| 66 | } |
| 67 | |
H Hartley Sweeten | 7f53f12 | 2011-01-11 18:46:10 -0600 | [diff] [blame] | 68 | static void blktrans_dev_put(struct mtd_blktrans_dev *dev) |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 69 | { |
| 70 | mutex_lock(&blktrans_ref_mutex); |
| 71 | kref_put(&dev->ref, blktrans_dev_release); |
| 72 | mutex_unlock(&blktrans_ref_mutex); |
| 73 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | static 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 Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 83 | block = blk_rq_pos(req) << 9 >> tr->blkshift; |
Tejun Heo | 1011c1b | 2009-05-07 22:24:45 +0900 | [diff] [blame] | 84 | nsect = blk_rq_cur_bytes(req) >> tr->blkshift; |
Jens Axboe | b4f42e2 | 2014-04-10 09:46:28 -0600 | [diff] [blame] | 85 | buf = bio_data(req->bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 87 | if (req->cmd_type != REQ_TYPE_FS) |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 88 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Roman Peniaev | 566c0d6a | 2014-03-08 21:59:14 +0900 | [diff] [blame] | 90 | if (req->cmd_flags & REQ_FLUSH) |
| 91 | return tr->flush(dev); |
| 92 | |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 93 | if (blk_rq_pos(req) + blk_rq_cur_sectors(req) > |
| 94 | get_capacity(req->rq_disk)) |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 95 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 97 | if (req->cmd_flags & REQ_DISCARD) |
Christoph Hellwig | 1122a26 | 2009-09-30 13:52:12 +0200 | [diff] [blame] | 98 | return tr->discard(dev, block, nsect); |
| 99 | |
Tomer Barletz | cc7fce8 | 2015-08-04 21:00:24 -0700 | [diff] [blame] | 100 | if (rq_data_dir(req) == READ) { |
Richard Purdie | 1918767 | 2006-10-27 09:09:33 +0100 | [diff] [blame] | 101 | for (; nsect > 0; nsect--, block++, buf += tr->blksize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | if (tr->readsect(dev, block, buf)) |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 103 | return -EIO; |
Ilya Loginov | 2d4dc89 | 2009-11-26 09:16:19 +0100 | [diff] [blame] | 104 | rq_flush_dcache_pages(req); |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 105 | return 0; |
Tomer Barletz | cc7fce8 | 2015-08-04 21:00:24 -0700 | [diff] [blame] | 106 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | if (!tr->writesect) |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 108 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Ilya Loginov | 2d4dc89 | 2009-11-26 09:16:19 +0100 | [diff] [blame] | 110 | rq_flush_dcache_pages(req); |
Richard Purdie | 1918767 | 2006-10-27 09:09:33 +0100 | [diff] [blame] | 111 | for (; nsect > 0; nsect--, block++, buf += tr->blksize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | if (tr->writesect(dev, block, buf)) |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 113 | return -EIO; |
| 114 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | } |
| 117 | |
Jarkko Lavinen | c7519db | 2011-02-14 16:16:09 +0200 | [diff] [blame] | 118 | int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev) |
| 119 | { |
Artem Bityutskiy | 7bf7e37 | 2011-03-25 17:41:20 +0200 | [diff] [blame] | 120 | return dev->bg_stop; |
Jarkko Lavinen | c7519db | 2011-02-14 16:16:09 +0200 | [diff] [blame] | 121 | } |
| 122 | EXPORT_SYMBOL_GPL(mtd_blktrans_cease_background); |
| 123 | |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 124 | static void mtd_blktrans_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | { |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 126 | struct mtd_blktrans_dev *dev = |
| 127 | container_of(work, struct mtd_blktrans_dev, work); |
Jarkko Lavinen | c7519db | 2011-02-14 16:16:09 +0200 | [diff] [blame] | 128 | struct mtd_blktrans_ops *tr = dev->tr; |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 129 | struct request_queue *rq = dev->rq; |
Tejun Heo | 1498ada | 2009-05-08 11:54:11 +0900 | [diff] [blame] | 130 | struct request *req = NULL; |
Jarkko Lavinen | c7519db | 2011-02-14 16:16:09 +0200 | [diff] [blame] | 131 | int background_done = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | spin_lock_irq(rq->queue_lock); |
Tejun Heo | 1498ada | 2009-05-08 11:54:11 +0900 | [diff] [blame] | 134 | |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 135 | while (1) { |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 136 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Artem Bityutskiy | 7bf7e37 | 2011-03-25 17:41:20 +0200 | [diff] [blame] | 138 | dev->bg_stop = false; |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 139 | if (!req && !(req = blk_fetch_request(rq))) { |
Jarkko Lavinen | c7519db | 2011-02-14 16:16:09 +0200 | [diff] [blame] | 140 | 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 Bityutskiy | 7bf7e37 | 2011-03-25 17:41:20 +0200 | [diff] [blame] | 150 | background_done = !dev->bg_stop; |
Jarkko Lavinen | c7519db | 2011-02-14 16:16:09 +0200 | [diff] [blame] | 151 | continue; |
| 152 | } |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 153 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | spin_unlock_irq(rq->queue_lock); |
| 157 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 158 | mutex_lock(&dev->lock); |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 159 | res = do_blktrans_request(dev->tr, dev, req); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 160 | mutex_unlock(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | spin_lock_irq(rq->queue_lock); |
| 163 | |
Tejun Heo | 1498ada | 2009-05-08 11:54:11 +0900 | [diff] [blame] | 164 | if (!__blk_end_request_cur(req, res)) |
| 165 | req = NULL; |
Jarkko Lavinen | c7519db | 2011-02-14 16:16:09 +0200 | [diff] [blame] | 166 | |
| 167 | background_done = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
Tejun Heo | 1498ada | 2009-05-08 11:54:11 +0900 | [diff] [blame] | 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | spin_unlock_irq(rq->queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static void mtd_blktrans_request(struct request_queue *rq) |
| 174 | { |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 175 | struct mtd_blktrans_dev *dev; |
| 176 | struct request *req = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 178 | dev = rq->queuedata; |
| 179 | |
| 180 | if (!dev) |
| 181 | while ((req = blk_fetch_request(rq)) != NULL) |
| 182 | __blk_end_request_all(req, -ENODEV); |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 183 | else |
| 184 | queue_work(dev->wq, &dev->work); |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
Al Viro | af0e2a0 | 2008-03-02 10:35:06 -0500 | [diff] [blame] | 187 | static int blktrans_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 189 | struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk); |
Maxim Levitsky | 008c751 | 2010-10-15 17:20:43 +0200 | [diff] [blame] | 190 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 192 | if (!dev) |
Arnd Bergmann | 6e9624b | 2010-08-07 18:25:34 +0200 | [diff] [blame] | 193 | return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 195 | mutex_lock(&dev->lock); |
Brian Norris | 073db4a | 2015-05-07 17:55:16 -0700 | [diff] [blame] | 196 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
Brian Norris | 342ff28 | 2011-11-07 15:51:05 -0800 | [diff] [blame] | 198 | if (dev->open) |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 199 | goto unlock; |
Maxim Levitsky | 008c751 | 2010-10-15 17:20:43 +0200 | [diff] [blame] | 200 | |
| 201 | kref_get(&dev->ref); |
| 202 | __module_get(dev->tr->owner); |
| 203 | |
Artem Bityutskiy | 94735ec | 2011-04-18 07:50:37 +0300 | [diff] [blame] | 204 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 212 | |
Artem Bityutskiy | 94735ec | 2011-04-18 07:50:37 +0300 | [diff] [blame] | 213 | ret = __get_mtd_device(dev->mtd); |
| 214 | if (ret) |
| 215 | goto error_release; |
Alexander Stein | 70d5098 | 2012-01-10 13:26:58 +0100 | [diff] [blame] | 216 | dev->file_mode = mode; |
Artem Bityutskiy | 94735ec | 2011-04-18 07:50:37 +0300 | [diff] [blame] | 217 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 218 | unlock: |
Brian Norris | 342ff28 | 2011-11-07 15:51:05 -0800 | [diff] [blame] | 219 | dev->open++; |
Brian Norris | 073db4a | 2015-05-07 17:55:16 -0700 | [diff] [blame] | 220 | mutex_unlock(&mtd_table_mutex); |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 221 | mutex_unlock(&dev->lock); |
| 222 | blktrans_dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | return ret; |
Artem Bityutskiy | 94735ec | 2011-04-18 07:50:37 +0300 | [diff] [blame] | 224 | |
| 225 | error_release: |
| 226 | if (dev->tr->release) |
| 227 | dev->tr->release(dev); |
| 228 | error_put: |
| 229 | module_put(dev->tr->owner); |
| 230 | kref_put(&dev->ref, blktrans_dev_release); |
Brian Norris | 073db4a | 2015-05-07 17:55:16 -0700 | [diff] [blame] | 231 | mutex_unlock(&mtd_table_mutex); |
Artem Bityutskiy | 94735ec | 2011-04-18 07:50:37 +0300 | [diff] [blame] | 232 | mutex_unlock(&dev->lock); |
| 233 | blktrans_dev_put(dev); |
| 234 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
| 236 | |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 237 | static void blktrans_release(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | { |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 239 | struct mtd_blktrans_dev *dev = blktrans_dev_get(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 241 | if (!dev) |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 242 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 244 | mutex_lock(&dev->lock); |
Brian Norris | 073db4a | 2015-05-07 17:55:16 -0700 | [diff] [blame] | 245 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Maxim Levitsky | 008c751 | 2010-10-15 17:20:43 +0200 | [diff] [blame] | 247 | if (--dev->open) |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 248 | goto unlock; |
| 249 | |
Maxim Levitsky | 008c751 | 2010-10-15 17:20:43 +0200 | [diff] [blame] | 250 | kref_put(&dev->ref, blktrans_dev_release); |
| 251 | module_put(dev->tr->owner); |
| 252 | |
| 253 | if (dev->mtd) { |
Al Viro | a8ca889 | 2013-05-05 21:31:22 -0400 | [diff] [blame] | 254 | if (dev->tr->release) |
| 255 | dev->tr->release(dev); |
Maxim Levitsky | 008c751 | 2010-10-15 17:20:43 +0200 | [diff] [blame] | 256 | __put_mtd_device(dev->mtd); |
| 257 | } |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 258 | unlock: |
Brian Norris | 073db4a | 2015-05-07 17:55:16 -0700 | [diff] [blame] | 259 | mutex_unlock(&mtd_table_mutex); |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 260 | mutex_unlock(&dev->lock); |
| 261 | blktrans_dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 264 | static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 265 | { |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 266 | struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk); |
| 267 | int ret = -ENXIO; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 268 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 269 | if (!dev) |
| 270 | return ret; |
| 271 | |
| 272 | mutex_lock(&dev->lock); |
| 273 | |
| 274 | if (!dev->mtd) |
| 275 | goto unlock; |
| 276 | |
Brian Norris | c4a3f13c | 2015-05-21 10:44:32 -0700 | [diff] [blame] | 277 | ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : -ENOTTY; |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 278 | unlock: |
| 279 | mutex_unlock(&dev->lock); |
| 280 | blktrans_dev_put(dev); |
| 281 | return ret; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 282 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
Al Viro | af0e2a0 | 2008-03-02 10:35:06 -0500 | [diff] [blame] | 284 | static int blktrans_ioctl(struct block_device *bdev, fmode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | unsigned int cmd, unsigned long arg) |
| 286 | { |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 287 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
| 298 | switch (cmd) { |
| 299 | case BLKFLSBUF: |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 300 | ret = dev->tr->flush ? dev->tr->flush(dev) : 0; |
Dan Carpenter | 007c2d8 | 2010-05-31 16:03:38 +0200 | [diff] [blame] | 301 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | default: |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 303 | ret = -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | } |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 305 | unlock: |
| 306 | mutex_unlock(&dev->lock); |
| 307 | blktrans_dev_put(dev); |
| 308 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Ezequiel Garcia | 9329c5e | 2012-11-09 12:36:35 -0300 | [diff] [blame] | 311 | static const struct block_device_operations mtd_block_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | .owner = THIS_MODULE, |
Al Viro | af0e2a0 | 2008-03-02 10:35:06 -0500 | [diff] [blame] | 313 | .open = blktrans_open, |
| 314 | .release = blktrans_release, |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 315 | .ioctl = blktrans_ioctl, |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 316 | .getgeo = blktrans_getgeo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | }; |
| 318 | |
| 319 | int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) |
| 320 | { |
| 321 | struct mtd_blktrans_ops *tr = new->tr; |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 322 | struct mtd_blktrans_dev *d; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | int last_devnum = -1; |
| 324 | struct gendisk *gd; |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 325 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Jean Delvare | b3561ea | 2007-05-08 00:30:46 -0700 | [diff] [blame] | 327 | if (mutex_trylock(&mtd_table_mutex)) { |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 328 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | BUG(); |
| 330 | } |
| 331 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 332 | mutex_lock(&blktrans_ref_mutex); |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 333 | list_for_each_entry(d, &tr->devs, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | 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 Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 344 | mutex_unlock(&blktrans_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | 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 Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 350 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | last_devnum = d->devnum; |
| 352 | } |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 353 | |
| 354 | ret = -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | if (new->devnum == -1) |
| 356 | new->devnum = last_devnum+1; |
| 357 | |
Ben Hutchings | 4d3a853 | 2010-01-29 20:59:53 +0000 | [diff] [blame] | 358 | /* 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 Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 362 | (tr->part_bits && new->devnum >= 27 * 26)) { |
| 363 | mutex_unlock(&blktrans_ref_mutex); |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 364 | goto error1; |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 365 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | list_add_tail(&new->list, &tr->devs); |
| 368 | added: |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 369 | mutex_unlock(&blktrans_ref_mutex); |
| 370 | |
David Woodhouse | ce37ab4 | 2007-12-03 12:46:12 +0000 | [diff] [blame] | 371 | mutex_init(&new->lock); |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 372 | kref_init(&new->ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | if (!tr->writesect) |
| 374 | new->readonly = 1; |
| 375 | |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 376 | /* Create gendisk */ |
| 377 | ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | gd = alloc_disk(1 << tr->part_bits); |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 379 | |
| 380 | if (!gd) |
| 381 | goto error2; |
| 382 | |
| 383 | new->disk = gd; |
| 384 | gd->private_data = new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | gd->major = tr->major; |
| 386 | gd->first_minor = (new->devnum) << tr->part_bits; |
Ezequiel Garcia | 9329c5e | 2012-11-09 12:36:35 -0300 | [diff] [blame] | 387 | gd->fops = &mtd_block_ops; |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 388 | |
Todd Poynor | 65a8de3 | 2005-07-29 20:42:07 +0100 | [diff] [blame] | 389 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
Richard Purdie | 1918767 | 2006-10-27 09:09:33 +0100 | [diff] [blame] | 402 | set_capacity(gd, (new->size * tr->blksize) >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 404 | /* 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 Peniaev | 566c0d6a | 2014-03-08 21:59:14 +0900 | [diff] [blame] | 411 | if (tr->flush) |
| 412 | blk_queue_flush(new->rq, REQ_FLUSH); |
| 413 | |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 414 | new->rq->queuedata = new; |
| 415 | blk_queue_logical_block_size(new->rq, tr->blksize); |
| 416 | |
Dan McGee | 16f7eca | 2011-09-28 00:21:42 -0500 | [diff] [blame] | 417 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, new->rq); |
Mike Snitzer | b277da0 | 2014-10-04 10:55:32 -0600 | [diff] [blame] | 418 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, new->rq); |
Dan McGee | 16f7eca | 2011-09-28 00:21:42 -0500 | [diff] [blame] | 419 | |
Jarkko Lavinen | 115ee88 | 2011-02-14 16:16:10 +0200 | [diff] [blame] | 420 | if (tr->discard) { |
| 421 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq); |
Jens Axboe | 2bb4cd5 | 2015-07-14 08:15:12 -0600 | [diff] [blame] | 422 | blk_queue_max_discard_sectors(new->rq, UINT_MAX); |
Jarkko Lavinen | 115ee88 | 2011-02-14 16:16:10 +0200 | [diff] [blame] | 423 | } |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 424 | |
| 425 | gd->queue = new->rq; |
| 426 | |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 427 | /* Create processing workqueue */ |
| 428 | new->wq = alloc_workqueue("%s%d", 0, 0, |
| 429 | tr->name, new->mtd->index); |
| 430 | if (!new->wq) |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 431 | goto error4; |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 432 | INIT_WORK(&new->work, mtd_blktrans_work); |
| 433 | |
David Woodhouse | d694846 | 2009-04-05 07:38:33 -0700 | [diff] [blame] | 434 | gd->driverfs_dev = &new->mtd->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | if (new->readonly) |
| 437 | set_disk_ro(gd, 1); |
| 438 | |
| 439 | add_disk(gd); |
Maxim Levitsky | 026ec57 | 2010-02-22 20:39:33 +0200 | [diff] [blame] | 440 | |
Maxim Levitsky | 133fa8c7 | 2010-02-26 22:08:40 +0200 | [diff] [blame] | 441 | if (new->disk_attributes) { |
| 442 | ret = sysfs_create_group(&disk_to_dev(gd)->kobj, |
Maxim Levitsky | 026ec57 | 2010-02-22 20:39:33 +0200 | [diff] [blame] | 443 | new->disk_attributes); |
Maxim Levitsky | 133fa8c7 | 2010-02-26 22:08:40 +0200 | [diff] [blame] | 444 | WARN_ON(ret); |
| 445 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | return 0; |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 447 | error4: |
| 448 | blk_cleanup_queue(new->rq); |
| 449 | error3: |
| 450 | put_disk(new->disk); |
| 451 | error2: |
| 452 | list_del(&new->list); |
| 453 | error1: |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 454 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old) |
| 458 | { |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 459 | unsigned long flags; |
| 460 | |
Jean Delvare | b3561ea | 2007-05-08 00:30:46 -0700 | [diff] [blame] | 461 | if (mutex_trylock(&mtd_table_mutex)) { |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 462 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | BUG(); |
| 464 | } |
| 465 | |
Maxim Levitsky | 026ec57 | 2010-02-22 20:39:33 +0200 | [diff] [blame] | 466 | if (old->disk_attributes) |
| 467 | sysfs_remove_group(&disk_to_dev(old->disk)->kobj, |
| 468 | old->disk_attributes); |
| 469 | |
Maxim Levitsky | dba76c0 | 2010-07-28 18:53:16 +0300 | [diff] [blame] | 470 | /* Stop new requests to arrive */ |
| 471 | del_gendisk(old->disk); |
| 472 | |
Ezequiel Garcia | 22a8578 | 2012-11-10 13:08:20 -0300 | [diff] [blame] | 473 | /* Stop workqueue. This will perform any pending request. */ |
| 474 | destroy_workqueue(old->wq); |
Maxim Levitsky | a863862 | 2010-02-22 20:39:29 +0200 | [diff] [blame] | 475 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 476 | /* 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 Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 481 | |
Maxim Levitsky | 008c751 | 2010-10-15 17:20:43 +0200 | [diff] [blame] | 482 | /* If the device is currently open, tell trans driver to close it, |
| 483 | then put mtd device, and don't touch it again */ |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 484 | mutex_lock(&old->lock); |
Maxim Levitsky | 008c751 | 2010-10-15 17:20:43 +0200 | [diff] [blame] | 485 | if (old->open) { |
| 486 | if (old->tr->release) |
| 487 | old->tr->release(old); |
| 488 | __put_mtd_device(old->mtd); |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 489 | } |
| 490 | |
Maxim Levitsky | 048d871 | 2010-02-22 20:39:30 +0200 | [diff] [blame] | 491 | old->mtd = NULL; |
| 492 | |
| 493 | mutex_unlock(&old->lock); |
| 494 | blktrans_dev_put(old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | static void blktrans_notify_remove(struct mtd_info *mtd) |
| 499 | { |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 500 | struct mtd_blktrans_ops *tr; |
| 501 | struct mtd_blktrans_dev *dev, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 503 | list_for_each_entry(tr, &blktrans_majors, list) |
| 504 | list_for_each_entry_safe(dev, next, &tr->devs, list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | if (dev->mtd == mtd) |
| 506 | tr->remove_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | static void blktrans_notify_add(struct mtd_info *mtd) |
| 510 | { |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 511 | struct mtd_blktrans_ops *tr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
| 513 | if (mtd->type == MTD_ABSENT) |
| 514 | return; |
| 515 | |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 516 | list_for_each_entry(tr, &blktrans_majors, list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | tr->add_mtd(tr, mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | |
| 520 | static struct mtd_notifier blktrans_notifier = { |
| 521 | .add = blktrans_notify_add, |
| 522 | .remove = blktrans_notify_remove, |
| 523 | }; |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | int register_mtd_blktrans(struct mtd_blktrans_ops *tr) |
| 526 | { |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 527 | struct mtd_info *mtd; |
| 528 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Thomas Gleixner | 97894cd | 2005-11-07 11:15:26 +0000 | [diff] [blame] | 530 | /* Register the notifier if/when the first device type is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 537 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
| 539 | ret = register_blkdev(tr->major, tr->name); |
Frank Li | 6fe4c59 | 2010-10-26 11:02:19 +0800 | [diff] [blame] | 540 | if (ret < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n", |
| 542 | tr->name, tr->major, ret); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 543 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | return ret; |
| 545 | } |
David Woodhouse | eae9acd | 2008-08-05 18:08:25 +0100 | [diff] [blame] | 546 | |
Frank Li | 6fe4c59 | 2010-10-26 11:02:19 +0800 | [diff] [blame] | 547 | if (ret) |
| 548 | tr->major = ret; |
| 549 | |
Richard Purdie | 1918767 | 2006-10-27 09:09:33 +0100 | [diff] [blame] | 550 | tr->blkshift = ffs(tr->blksize) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | INIT_LIST_HEAD(&tr->devs); |
| 553 | list_add(&tr->list, &blktrans_majors); |
| 554 | |
Ben Hutchings | f1332ba | 2010-01-29 20:57:11 +0000 | [diff] [blame] | 555 | mtd_for_each_device(mtd) |
| 556 | if (mtd->type != MTD_ABSENT) |
| 557 | tr->add_mtd(tr, mtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 559 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr) |
| 564 | { |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 565 | struct mtd_blktrans_dev *dev, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 567 | mutex_lock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | /* Remove it from the list of active majors */ |
| 570 | list_del(&tr->list); |
| 571 | |
Chris Malley | 71a928c | 2008-05-19 20:11:50 +0100 | [diff] [blame] | 572 | list_for_each_entry_safe(dev, next, &tr->devs, list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | tr->remove_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | unregister_blkdev(tr->major, tr->name); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 576 | mutex_unlock(&mtd_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Eric Sesterhenn | 373ebfb | 2006-03-26 18:15:12 +0200 | [diff] [blame] | 578 | BUG_ON(!list_empty(&tr->devs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | static 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 | |
| 590 | module_exit(mtd_blktrans_exit); |
| 591 | |
| 592 | EXPORT_SYMBOL_GPL(register_mtd_blktrans); |
| 593 | EXPORT_SYMBOL_GPL(deregister_mtd_blktrans); |
| 594 | EXPORT_SYMBOL_GPL(add_mtd_blktrans_dev); |
| 595 | EXPORT_SYMBOL_GPL(del_mtd_blktrans_dev); |
| 596 | |
| 597 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
| 598 | MODULE_LICENSE("GPL"); |
| 599 | MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'"); |