blob: 4a85096f5410adde92d01cd58ecba30373c808f1 [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>
Paul Gortmakerd5decd32011-05-26 16:00:52 -04003#include <linux/export.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09004#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/blkpg.h>
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08006#include <linux/hdreg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/backing-dev.h>
Al Viroff01bb42011-09-16 02:31:11 -04008#include <linux/fs.h>
Jens Axboe2056a782006-03-23 20:00:26 +01009#include <linux/blktrace_api.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <asm/uaccess.h>
11
12static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
13{
14 struct block_device *bdevp;
15 struct gendisk *disk;
Vivek Goyalc83f6bf2012-08-01 12:24:18 +020016 struct hd_struct *part, *lpart;
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 struct blkpg_ioctl_arg a;
18 struct blkpg_partition p;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020019 struct disk_part_iter piter;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 long long start, length;
Tejun Heocf771cb2008-09-03 09:01:09 +020021 int partno;
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;
Vivek Goyalc83f6bf2012-08-01 12:24:18 +020039 /* check for fit in a hd_struct */
40 if (sizeof(sector_t) == sizeof(long) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 sizeof(long long) > sizeof(long)) {
42 long pstart = start, plength = length;
43 if (pstart != start || plength != length
Alan Cox2bd6efa2012-09-17 11:47:13 +010044 || pstart < 0 || plength < 0 || partno > 65535)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 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 Heoba329292008-11-10 15:29:58 +090064 part = add_partition(disk, partno, start, length,
Will Drewry6d1d8052010-08-31 15:47:05 -050065 ADDPART_FLAG_NONE, NULL);
Arjan van de Venc039e312006-03-23 03:00:28 -080066 mutex_unlock(&bdev->bd_mutex);
Tejun Heoba329292008-11-10 15:29:58 +090067 return IS_ERR(part) ? PTR_ERR(part) : 0;
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;
Vivek Goyalc83f6bf2012-08-01 12:24:18 +020095 case BLKPG_RESIZE_PARTITION:
96 start = p.start >> 9;
97 /* new length of partition in bytes */
98 length = p.length >> 9;
99 /* check for fit in a hd_struct */
100 if (sizeof(sector_t) == sizeof(long) &&
101 sizeof(long long) > sizeof(long)) {
102 long pstart = start, plength = length;
103 if (pstart != start || plength != length
104 || pstart < 0 || plength < 0)
105 return -EINVAL;
106 }
107 part = disk_get_part(disk, partno);
108 if (!part)
109 return -ENXIO;
110 bdevp = bdget(part_devt(part));
111 if (!bdevp) {
112 disk_put_part(part);
113 return -ENOMEM;
114 }
115 mutex_lock(&bdevp->bd_mutex);
116 mutex_lock_nested(&bdev->bd_mutex, 1);
117 if (start != part->start_sect) {
118 mutex_unlock(&bdevp->bd_mutex);
119 mutex_unlock(&bdev->bd_mutex);
120 bdput(bdevp);
121 disk_put_part(part);
122 return -EINVAL;
123 }
124 /* overlap? */
125 disk_part_iter_init(&piter, disk,
126 DISK_PITER_INCL_EMPTY);
127 while ((lpart = disk_part_iter_next(&piter))) {
128 if (lpart->partno != partno &&
129 !(start + length <= lpart->start_sect ||
130 start >= lpart->start_sect + lpart->nr_sects)
131 ) {
132 disk_part_iter_exit(&piter);
133 mutex_unlock(&bdevp->bd_mutex);
134 mutex_unlock(&bdev->bd_mutex);
135 bdput(bdevp);
136 disk_put_part(part);
137 return -EBUSY;
138 }
139 }
140 disk_part_iter_exit(&piter);
141 part_nr_sects_write(part, (sector_t)length);
142 i_size_write(bdevp->bd_inode, p.length);
143 mutex_unlock(&bdevp->bd_mutex);
144 mutex_unlock(&bdev->bd_mutex);
145 bdput(bdevp);
146 disk_put_part(part);
147 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 default:
149 return -EINVAL;
150 }
151}
152
153static int blkdev_reread_part(struct block_device *bdev)
154{
155 struct gendisk *disk = bdev->bd_disk;
156 int res;
157
Tejun Heod27769e2011-08-23 20:01:04 +0200158 if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 return -EINVAL;
160 if (!capable(CAP_SYS_ADMIN))
161 return -EACCES;
Arjan van de Venc039e312006-03-23 03:00:28 -0800162 if (!mutex_trylock(&bdev->bd_mutex))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 return -EBUSY;
164 res = rescan_partitions(disk, bdev);
Arjan van de Venc039e312006-03-23 03:00:28 -0800165 mutex_unlock(&bdev->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 return res;
167}
168
David Woodhoused30a2602008-08-11 15:58:42 +0100169static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
Adrian Hunter8d57a982010-08-11 14:17:49 -0700170 uint64_t len, int secure)
David Woodhoused30a2602008-08-11 15:58:42 +0100171{
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200172 unsigned long flags = 0;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700173
David Woodhoused30a2602008-08-11 15:58:42 +0100174 if (start & 511)
175 return -EINVAL;
176 if (len & 511)
177 return -EINVAL;
178 start >>= 9;
179 len >>= 9;
180
Mike Snitzer77304d22010-11-08 14:39:12 +0100181 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
David Woodhoused30a2602008-08-11 15:58:42 +0100182 return -EINVAL;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700183 if (secure)
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200184 flags |= BLKDEV_DISCARD_SECURE;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700185 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
David Woodhoused30a2602008-08-11 15:58:42 +0100186}
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static int put_ushort(unsigned long arg, unsigned short val)
189{
190 return put_user(val, (unsigned short __user *)arg);
191}
192
193static int put_int(unsigned long arg, int val)
194{
195 return put_user(val, (int __user *)arg);
196}
197
Martin K. Petersenac481c22009-10-03 20:52:01 +0200198static int put_uint(unsigned long arg, unsigned int val)
199{
200 return put_user(val, (unsigned int __user *)arg);
201}
202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203static int put_long(unsigned long arg, long val)
204{
205 return put_user(val, (long __user *)arg);
206}
207
208static int put_ulong(unsigned long arg, unsigned long val)
209{
210 return put_user(val, (unsigned long __user *)arg);
211}
212
213static int put_u64(unsigned long arg, u64 val)
214{
215 return put_user(val, (u64 __user *)arg);
216}
217
Al Viro633a08b2007-08-29 20:34:12 -0400218int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
219 unsigned cmd, unsigned long arg)
220{
221 struct gendisk *disk = bdev->bd_disk;
Al Virod4430d62008-03-02 09:09:22 -0500222
223 if (disk->fops->ioctl)
224 return disk->fops->ioctl(bdev, mode, cmd, arg);
225
Al Viro633a08b2007-08-29 20:34:12 -0400226 return -ENOTTY;
227}
228/*
229 * For the record: _GPL here is only because somebody decided to slap it
230 * on the previous export. Sheer idiocy, since it wasn't copyrightable
231 * at all and could be open-coded without any exports by anybody who cares.
232 */
233EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
234
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200235/*
Linus Torvalds07d106d2012-01-05 15:40:12 -0800236 * Is it an unrecognized ioctl? The correct returns are either
237 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
238 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
239 * code before returning.
240 *
241 * Confused drivers sometimes return EINVAL, which is wrong. It
242 * means "I understood the ioctl command, but the parameters to
243 * it were wrong".
244 *
245 * We should aim to just fix the broken drivers, the EINVAL case
246 * should go away.
247 */
248static inline int is_unrecognized_ioctl(int ret)
249{
250 return ret == -EINVAL ||
251 ret == -ENOTTY ||
252 ret == -ENOIOCTLCMD;
253}
254
255/*
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200256 * always keep this in sync with compat_blkdev_ioctl()
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200257 */
Al Viro56b26ad2008-09-19 03:17:36 -0400258int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700259 unsigned long arg)
260{
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700261 struct gendisk *disk = bdev->bd_disk;
Al Viro45048d02008-09-18 15:53:24 -0400262 struct backing_dev_info *bdi;
263 loff_t size;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700264 int ret, n;
265
266 switch(cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 case BLKFLSBUF:
268 if (!capable(CAP_SYS_ADMIN))
269 return -EACCES;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700270
Al Viroe436fda2008-09-18 03:38:12 -0400271 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Linus Torvalds07d106d2012-01-05 15:40:12 -0800272 if (!is_unrecognized_ioctl(ret))
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700273 return ret;
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 fsync_bdev(bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700276 invalidate_bdev(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return 0;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 case BLKROSET:
Al Viroe436fda2008-09-18 03:38:12 -0400280 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Linus Torvalds07d106d2012-01-05 15:40:12 -0800281 if (!is_unrecognized_ioctl(ret))
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700282 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 if (!capable(CAP_SYS_ADMIN))
284 return -EACCES;
285 if (get_user(n, (int __user *)(arg)))
286 return -EFAULT;
287 set_device_ro(bdev, n);
288 return 0;
David Woodhoused30a2602008-08-11 15:58:42 +0100289
Adrian Hunter8d57a982010-08-11 14:17:49 -0700290 case BLKDISCARD:
291 case BLKSECDISCARD: {
David Woodhoused30a2602008-08-11 15:58:42 +0100292 uint64_t range[2];
293
Al Viroe436fda2008-09-18 03:38:12 -0400294 if (!(mode & FMODE_WRITE))
David Woodhoused30a2602008-08-11 15:58:42 +0100295 return -EBADF;
296
297 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
298 return -EFAULT;
299
Adrian Hunter8d57a982010-08-11 14:17:49 -0700300 return blk_ioctl_discard(bdev, range[0], range[1],
301 cmd == BLKSECDISCARD);
David Woodhoused30a2602008-08-11 15:58:42 +0100302 }
303
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800304 case HDIO_GETGEO: {
305 struct hd_geometry geo;
306
307 if (!arg)
308 return -EINVAL;
309 if (!disk->fops->getgeo)
310 return -ENOTTY;
311
312 /*
313 * We need to set the startsect first, the driver may
314 * want to override it.
315 */
Vasiliy Kulikova0147412010-11-08 14:42:40 +0100316 memset(&geo, 0, sizeof(geo));
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800317 geo.start = get_start_sect(bdev);
318 ret = disk->fops->getgeo(bdev, &geo);
319 if (ret)
320 return ret;
321 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
322 sizeof(geo)))
323 return -EFAULT;
324 return 0;
325 }
Al Viro45048d02008-09-18 15:53:24 -0400326 case BLKRAGET:
327 case BLKFRAGET:
328 if (!arg)
329 return -EINVAL;
330 bdi = blk_get_backing_dev_info(bdev);
331 if (bdi == NULL)
332 return -ENOTTY;
333 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
334 case BLKROGET:
335 return put_int(arg, bdev_read_only(bdev) != 0);
Martin K. Petersenac481c22009-10-03 20:52:01 +0200336 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
Al Viro45048d02008-09-18 15:53:24 -0400337 return put_int(arg, block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200338 case BLKSSZGET: /* get block device logical block size */
Martin K. Petersene1defc42009-05-22 17:17:49 -0400339 return put_int(arg, bdev_logical_block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200340 case BLKPBSZGET: /* get block device physical block size */
341 return put_uint(arg, bdev_physical_block_size(bdev));
342 case BLKIOMIN:
343 return put_uint(arg, bdev_io_min(bdev));
344 case BLKIOOPT:
345 return put_uint(arg, bdev_io_opt(bdev));
346 case BLKALIGNOFF:
347 return put_int(arg, bdev_alignment_offset(bdev));
Martin K. Petersen98262f22009-12-03 09:24:48 +0100348 case BLKDISCARDZEROES:
349 return put_uint(arg, bdev_discard_zeroes_data(bdev));
Al Viro45048d02008-09-18 15:53:24 -0400350 case BLKSECTGET:
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400351 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
Martin K. Petersenef00f592012-01-11 16:29:31 +0100352 case BLKROTATIONAL:
353 return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
Al Viro45048d02008-09-18 15:53:24 -0400354 case BLKRASET:
355 case BLKFRASET:
356 if(!capable(CAP_SYS_ADMIN))
357 return -EACCES;
358 bdi = blk_get_backing_dev_info(bdev);
359 if (bdi == NULL)
360 return -ENOTTY;
Al Viro45048d02008-09-18 15:53:24 -0400361 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
Al Viro45048d02008-09-18 15:53:24 -0400362 return 0;
363 case BLKBSZSET:
364 /* set the logical block size */
365 if (!capable(CAP_SYS_ADMIN))
366 return -EACCES;
367 if (!arg)
368 return -EINVAL;
369 if (get_user(n, (int __user *) arg))
370 return -EFAULT;
Miklos Szeredi3c522ce2011-02-24 15:45:41 +0100371 if (!(mode & FMODE_EXCL)) {
372 bdgrab(bdev);
373 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
374 return -EBUSY;
375 }
Al Viro45048d02008-09-18 15:53:24 -0400376 ret = set_blocksize(bdev, n);
Al Viro6af3a562008-09-19 03:08:13 -0400377 if (!(mode & FMODE_EXCL))
Tejun Heoe525fd82010-11-13 11:55:17 +0100378 blkdev_put(bdev, mode | FMODE_EXCL);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700379 return ret;
Al Viro45048d02008-09-18 15:53:24 -0400380 case BLKPG:
Al Viro45048d02008-09-18 15:53:24 -0400381 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400382 break;
383 case BLKRRPART:
Al Viro45048d02008-09-18 15:53:24 -0400384 ret = blkdev_reread_part(bdev);
Al Viro45048d02008-09-18 15:53:24 -0400385 break;
386 case BLKGETSIZE:
Mike Snitzer77304d22010-11-08 14:39:12 +0100387 size = i_size_read(bdev->bd_inode);
Al Viro45048d02008-09-18 15:53:24 -0400388 if ((size >> 9) > ~0UL)
389 return -EFBIG;
390 return put_ulong(arg, size >> 9);
391 case BLKGETSIZE64:
Mike Snitzer77304d22010-11-08 14:39:12 +0100392 return put_u64(arg, i_size_read(bdev->bd_inode));
Al Viro45048d02008-09-18 15:53:24 -0400393 case BLKTRACESTART:
394 case BLKTRACESTOP:
395 case BLKTRACESETUP:
396 case BLKTRACETEARDOWN:
Al Viro45048d02008-09-18 15:53:24 -0400397 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400398 break;
399 default:
400 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
401 }
402 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403}
Stephen Tweedie68f66fe2005-05-13 23:31:19 -0400404EXPORT_SYMBOL_GPL(blkdev_ioctl);