blob: c832d639b6e254eb375d9c69504172182ab14c4d [file] [log] [blame]
Randy.Dunlapc59ede72006-01-11 12:17:46 -08001#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07002#include <linux/blkdev.h>
3#include <linux/blkpg.h>
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08004#include <linux/hdreg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/backing-dev.h>
6#include <linux/buffer_head.h>
7#include <linux/smp_lock.h>
Jens Axboe2056a782006-03-23 20:00:26 +01008#include <linux/blktrace_api.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <asm/uaccess.h>
10
11static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
12{
13 struct block_device *bdevp;
14 struct gendisk *disk;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020015 struct hd_struct *part;
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 struct blkpg_ioctl_arg a;
17 struct blkpg_partition p;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020018 struct disk_part_iter piter;
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 long long start, length;
Tejun Heocf771cb2008-09-03 09:01:09 +020020 int partno;
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -070021 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23 if (!capable(CAP_SYS_ADMIN))
24 return -EACCES;
25 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
26 return -EFAULT;
27 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
28 return -EFAULT;
29 disk = bdev->bd_disk;
30 if (bdev != bdev->bd_contains)
31 return -EINVAL;
Tejun Heocf771cb2008-09-03 09:01:09 +020032 partno = p.pno;
Tejun Heo540eed52008-08-25 19:56:15 +090033 if (partno <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 return -EINVAL;
35 switch (a.op) {
36 case BLKPG_ADD_PARTITION:
37 start = p.start >> 9;
38 length = p.length >> 9;
39 /* check for fit in a hd_struct */
40 if (sizeof(sector_t) == sizeof(long) &&
41 sizeof(long long) > sizeof(long)) {
42 long pstart = start, plength = length;
43 if (pstart != start || plength != length
44 || pstart < 0 || plength < 0)
45 return -EINVAL;
46 }
Tejun Heo88e34122008-08-25 19:30:16 +090047
Arjan van de Venc039e312006-03-23 03:00:28 -080048 mutex_lock(&bdev->bd_mutex);
Tejun Heo88e34122008-08-25 19:30:16 +090049
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 /* overlap? */
Tejun Heoe71bf0d2008-09-03 09:03:02 +020051 disk_part_iter_init(&piter, disk,
52 DISK_PITER_INCL_EMPTY);
53 while ((part = disk_part_iter_next(&piter))) {
54 if (!(start + length <= part->start_sect ||
55 start >= part->start_sect + part->nr_sects)) {
56 disk_part_iter_exit(&piter);
Arjan van de Venc039e312006-03-23 03:00:28 -080057 mutex_unlock(&bdev->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 return -EBUSY;
59 }
60 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +020061 disk_part_iter_exit(&piter);
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 /* all seems OK */
Tejun Heocf771cb2008-09-03 09:01:09 +020064 err = add_partition(disk, partno, start, length,
65 ADDPART_FLAG_NONE);
Arjan van de Venc039e312006-03-23 03:00:28 -080066 mutex_unlock(&bdev->bd_mutex);
Abdel Benamrouche04ebd4a2008-07-25 01:48:26 -070067 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 case BLKPG_DEL_PARTITION:
Tejun Heoe71bf0d2008-09-03 09:03:02 +020069 part = disk_get_part(disk, partno);
70 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 return -ENXIO;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020072
73 bdevp = bdget(part_devt(part));
74 disk_put_part(part);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 if (!bdevp)
76 return -ENOMEM;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020077
Peter Zijlstra2e7b6512006-12-08 02:36:13 -080078 mutex_lock(&bdevp->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 if (bdevp->bd_openers) {
Arjan van de Venc039e312006-03-23 03:00:28 -080080 mutex_unlock(&bdevp->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 bdput(bdevp);
82 return -EBUSY;
83 }
84 /* all seems OK */
85 fsync_bdev(bdevp);
Peter Zijlstraf98393a2007-05-06 14:49:54 -070086 invalidate_bdev(bdevp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Peter Zijlstra6d740cd2007-02-20 13:58:18 -080088 mutex_lock_nested(&bdev->bd_mutex, 1);
Tejun Heocf771cb2008-09-03 09:01:09 +020089 delete_partition(disk, partno);
Arjan van de Venc039e312006-03-23 03:00:28 -080090 mutex_unlock(&bdev->bd_mutex);
91 mutex_unlock(&bdevp->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 bdput(bdevp);
93
94 return 0;
95 default:
96 return -EINVAL;
97 }
98}
99
100static int blkdev_reread_part(struct block_device *bdev)
101{
102 struct gendisk *disk = bdev->bd_disk;
103 int res;
104
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200105 if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return -EINVAL;
107 if (!capable(CAP_SYS_ADMIN))
108 return -EACCES;
Arjan van de Venc039e312006-03-23 03:00:28 -0800109 if (!mutex_trylock(&bdev->bd_mutex))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 return -EBUSY;
111 res = rescan_partitions(disk, bdev);
Arjan van de Venc039e312006-03-23 03:00:28 -0800112 mutex_unlock(&bdev->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return res;
114}
115
David Woodhoused30a2602008-08-11 15:58:42 +0100116static void blk_ioc_discard_endio(struct bio *bio, int err)
117{
118 if (err) {
119 if (err == -EOPNOTSUPP)
120 set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
121 clear_bit(BIO_UPTODATE, &bio->bi_flags);
122 }
123 complete(bio->bi_private);
124}
125
126static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
127 uint64_t len)
128{
129 struct request_queue *q = bdev_get_queue(bdev);
130 int ret = 0;
131
132 if (start & 511)
133 return -EINVAL;
134 if (len & 511)
135 return -EINVAL;
136 start >>= 9;
137 len >>= 9;
138
139 if (start + len > (bdev->bd_inode->i_size >> 9))
140 return -EINVAL;
141
142 if (!q->prepare_discard_fn)
143 return -EOPNOTSUPP;
144
145 while (len && !ret) {
146 DECLARE_COMPLETION_ONSTACK(wait);
147 struct bio *bio;
148
149 bio = bio_alloc(GFP_KERNEL, 0);
150 if (!bio)
151 return -ENOMEM;
152
153 bio->bi_end_io = blk_ioc_discard_endio;
154 bio->bi_bdev = bdev;
155 bio->bi_private = &wait;
156 bio->bi_sector = start;
157
158 if (len > q->max_hw_sectors) {
159 bio->bi_size = q->max_hw_sectors << 9;
160 len -= q->max_hw_sectors;
161 start += q->max_hw_sectors;
162 } else {
163 bio->bi_size = len << 9;
164 len = 0;
165 }
David Woodhousee17fc0a2008-08-09 16:42:20 +0100166 submit_bio(DISCARD_NOBARRIER, bio);
David Woodhoused30a2602008-08-11 15:58:42 +0100167
168 wait_for_completion(&wait);
169
170 if (bio_flagged(bio, BIO_EOPNOTSUPP))
171 ret = -EOPNOTSUPP;
172 else if (!bio_flagged(bio, BIO_UPTODATE))
173 ret = -EIO;
174 bio_put(bio);
175 }
176 return ret;
177}
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179static int put_ushort(unsigned long arg, unsigned short val)
180{
181 return put_user(val, (unsigned short __user *)arg);
182}
183
184static int put_int(unsigned long arg, int val)
185{
186 return put_user(val, (int __user *)arg);
187}
188
189static int put_long(unsigned long arg, long val)
190{
191 return put_user(val, (long __user *)arg);
192}
193
194static int put_ulong(unsigned long arg, unsigned long val)
195{
196 return put_user(val, (unsigned long __user *)arg);
197}
198
199static int put_u64(unsigned long arg, u64 val)
200{
201 return put_user(val, (u64 __user *)arg);
202}
203
Al Viro633a08b2007-08-29 20:34:12 -0400204int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
205 unsigned cmd, unsigned long arg)
206{
207 struct gendisk *disk = bdev->bd_disk;
208 int ret;
Al Virod4430d62008-03-02 09:09:22 -0500209
210 if (disk->fops->ioctl)
211 return disk->fops->ioctl(bdev, mode, cmd, arg);
212
213 if (disk->fops->locked_ioctl) {
214 lock_kernel();
215 ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
Al Viro633a08b2007-08-29 20:34:12 -0400216 unlock_kernel();
217 return ret;
218 }
219
220 return -ENOTTY;
221}
222/*
223 * For the record: _GPL here is only because somebody decided to slap it
224 * on the previous export. Sheer idiocy, since it wasn't copyrightable
225 * at all and could be open-coded without any exports by anybody who cares.
226 */
227EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
228
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200229/*
230 * always keep this in sync with compat_blkdev_ioctl() and
231 * compat_blkdev_locked_ioctl()
232 */
Al Viro56b26ad2008-09-19 03:17:36 -0400233int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700234 unsigned long arg)
235{
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700236 struct gendisk *disk = bdev->bd_disk;
Al Viro45048d02008-09-18 15:53:24 -0400237 struct backing_dev_info *bdi;
238 loff_t size;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700239 int ret, n;
240
241 switch(cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 case BLKFLSBUF:
243 if (!capable(CAP_SYS_ADMIN))
244 return -EACCES;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700245
Al Viroe436fda2008-09-18 03:38:12 -0400246 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700247 /* -EINVAL to handle old uncorrected drivers */
248 if (ret != -EINVAL && ret != -ENOTTY)
249 return ret;
250
251 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 fsync_bdev(bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700253 invalidate_bdev(bdev);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700254 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return 0;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 case BLKROSET:
Al Viroe436fda2008-09-18 03:38:12 -0400258 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700259 /* -EINVAL to handle old uncorrected drivers */
260 if (ret != -EINVAL && ret != -ENOTTY)
261 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if (!capable(CAP_SYS_ADMIN))
263 return -EACCES;
264 if (get_user(n, (int __user *)(arg)))
265 return -EFAULT;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700266 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 set_device_ro(bdev, n);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700268 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return 0;
David Woodhoused30a2602008-08-11 15:58:42 +0100270
271 case BLKDISCARD: {
272 uint64_t range[2];
273
Al Viroe436fda2008-09-18 03:38:12 -0400274 if (!(mode & FMODE_WRITE))
David Woodhoused30a2602008-08-11 15:58:42 +0100275 return -EBADF;
276
277 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
278 return -EFAULT;
279
280 return blk_ioctl_discard(bdev, range[0], range[1]);
281 }
282
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800283 case HDIO_GETGEO: {
284 struct hd_geometry geo;
285
286 if (!arg)
287 return -EINVAL;
288 if (!disk->fops->getgeo)
289 return -ENOTTY;
290
291 /*
292 * We need to set the startsect first, the driver may
293 * want to override it.
294 */
295 geo.start = get_start_sect(bdev);
296 ret = disk->fops->getgeo(bdev, &geo);
297 if (ret)
298 return ret;
299 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
300 sizeof(geo)))
301 return -EFAULT;
302 return 0;
303 }
Al Viro45048d02008-09-18 15:53:24 -0400304 case BLKRAGET:
305 case BLKFRAGET:
306 if (!arg)
307 return -EINVAL;
308 bdi = blk_get_backing_dev_info(bdev);
309 if (bdi == NULL)
310 return -ENOTTY;
311 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
312 case BLKROGET:
313 return put_int(arg, bdev_read_only(bdev) != 0);
314 case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
315 return put_int(arg, block_size(bdev));
316 case BLKSSZGET: /* get block device hardware sector size */
317 return put_int(arg, bdev_hardsect_size(bdev));
318 case BLKSECTGET:
319 return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
320 case BLKRASET:
321 case BLKFRASET:
322 if(!capable(CAP_SYS_ADMIN))
323 return -EACCES;
324 bdi = blk_get_backing_dev_info(bdev);
325 if (bdi == NULL)
326 return -ENOTTY;
327 lock_kernel();
328 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
329 unlock_kernel();
330 return 0;
331 case BLKBSZSET:
332 /* set the logical block size */
333 if (!capable(CAP_SYS_ADMIN))
334 return -EACCES;
335 if (!arg)
336 return -EINVAL;
337 if (get_user(n, (int __user *) arg))
338 return -EFAULT;
Al Viro6af3a562008-09-19 03:08:13 -0400339 if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
Al Viro45048d02008-09-18 15:53:24 -0400340 return -EBUSY;
341 ret = set_blocksize(bdev, n);
Al Viro6af3a562008-09-19 03:08:13 -0400342 if (!(mode & FMODE_EXCL))
343 bd_release(bdev);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700344 return ret;
Al Viro45048d02008-09-18 15:53:24 -0400345 case BLKPG:
346 lock_kernel();
347 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
348 unlock_kernel();
349 break;
350 case BLKRRPART:
351 lock_kernel();
352 ret = blkdev_reread_part(bdev);
353 unlock_kernel();
354 break;
355 case BLKGETSIZE:
356 size = bdev->bd_inode->i_size;
357 if ((size >> 9) > ~0UL)
358 return -EFBIG;
359 return put_ulong(arg, size >> 9);
360 case BLKGETSIZE64:
361 return put_u64(arg, bdev->bd_inode->i_size);
362 case BLKTRACESTART:
363 case BLKTRACESTOP:
364 case BLKTRACESETUP:
365 case BLKTRACETEARDOWN:
366 lock_kernel();
367 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
368 unlock_kernel();
369 break;
370 default:
371 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
372 }
373 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
Stephen Tweedie68f66fe2005-05-13 23:31:19 -0400375EXPORT_SYMBOL_GPL(blkdev_ioctl);