blob: 1124cd297263571d63371ca8ed33f8c361b74e06 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09003#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/blkpg.h>
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08005#include <linux/hdreg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/backing-dev.h>
7#include <linux/buffer_head.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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22 if (!capable(CAP_SYS_ADMIN))
23 return -EACCES;
24 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
25 return -EFAULT;
26 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
27 return -EFAULT;
28 disk = bdev->bd_disk;
29 if (bdev != bdev->bd_contains)
30 return -EINVAL;
Tejun Heocf771cb2008-09-03 09:01:09 +020031 partno = p.pno;
Tejun Heo540eed52008-08-25 19:56:15 +090032 if (partno <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 return -EINVAL;
34 switch (a.op) {
35 case BLKPG_ADD_PARTITION:
36 start = p.start >> 9;
37 length = p.length >> 9;
38 /* check for fit in a hd_struct */
39 if (sizeof(sector_t) == sizeof(long) &&
40 sizeof(long long) > sizeof(long)) {
41 long pstart = start, plength = length;
42 if (pstart != start || plength != length
43 || pstart < 0 || plength < 0)
44 return -EINVAL;
45 }
Tejun Heo88e34122008-08-25 19:30:16 +090046
Arjan van de Venc039e312006-03-23 03:00:28 -080047 mutex_lock(&bdev->bd_mutex);
Tejun Heo88e34122008-08-25 19:30:16 +090048
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 /* overlap? */
Tejun Heoe71bf0d2008-09-03 09:03:02 +020050 disk_part_iter_init(&piter, disk,
51 DISK_PITER_INCL_EMPTY);
52 while ((part = disk_part_iter_next(&piter))) {
53 if (!(start + length <= part->start_sect ||
54 start >= part->start_sect + part->nr_sects)) {
55 disk_part_iter_exit(&piter);
Arjan van de Venc039e312006-03-23 03:00:28 -080056 mutex_unlock(&bdev->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return -EBUSY;
58 }
59 }
Tejun Heoe71bf0d2008-09-03 09:03:02 +020060 disk_part_iter_exit(&piter);
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 /* all seems OK */
Tejun Heoba329292008-11-10 15:29:58 +090063 part = add_partition(disk, partno, start, length,
Will Drewry6d1d8052010-08-31 15:47:05 -050064 ADDPART_FLAG_NONE, NULL);
Arjan van de Venc039e312006-03-23 03:00:28 -080065 mutex_unlock(&bdev->bd_mutex);
Tejun Heoba329292008-11-10 15:29:58 +090066 return IS_ERR(part) ? PTR_ERR(part) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 case BLKPG_DEL_PARTITION:
Tejun Heoe71bf0d2008-09-03 09:03:02 +020068 part = disk_get_part(disk, partno);
69 if (!part)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 return -ENXIO;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020071
72 bdevp = bdget(part_devt(part));
73 disk_put_part(part);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if (!bdevp)
75 return -ENOMEM;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020076
Peter Zijlstra2e7b6512006-12-08 02:36:13 -080077 mutex_lock(&bdevp->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 if (bdevp->bd_openers) {
Arjan van de Venc039e312006-03-23 03:00:28 -080079 mutex_unlock(&bdevp->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 bdput(bdevp);
81 return -EBUSY;
82 }
83 /* all seems OK */
84 fsync_bdev(bdevp);
Peter Zijlstraf98393a2007-05-06 14:49:54 -070085 invalidate_bdev(bdevp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Peter Zijlstra6d740cd2007-02-20 13:58:18 -080087 mutex_lock_nested(&bdev->bd_mutex, 1);
Tejun Heocf771cb2008-09-03 09:01:09 +020088 delete_partition(disk, partno);
Arjan van de Venc039e312006-03-23 03:00:28 -080089 mutex_unlock(&bdev->bd_mutex);
90 mutex_unlock(&bdevp->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 bdput(bdevp);
92
93 return 0;
94 default:
95 return -EINVAL;
96 }
97}
98
99static int blkdev_reread_part(struct block_device *bdev)
100{
101 struct gendisk *disk = bdev->bd_disk;
102 int res;
103
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200104 if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return -EINVAL;
106 if (!capable(CAP_SYS_ADMIN))
107 return -EACCES;
Arjan van de Venc039e312006-03-23 03:00:28 -0800108 if (!mutex_trylock(&bdev->bd_mutex))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return -EBUSY;
110 res = rescan_partitions(disk, bdev);
Arjan van de Venc039e312006-03-23 03:00:28 -0800111 mutex_unlock(&bdev->bd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return res;
113}
114
David Woodhoused30a2602008-08-11 15:58:42 +0100115static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
Adrian Hunter8d57a982010-08-11 14:17:49 -0700116 uint64_t len, int secure)
David Woodhoused30a2602008-08-11 15:58:42 +0100117{
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200118 unsigned long flags = 0;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700119
David Woodhoused30a2602008-08-11 15:58:42 +0100120 if (start & 511)
121 return -EINVAL;
122 if (len & 511)
123 return -EINVAL;
124 start >>= 9;
125 len >>= 9;
126
Mike Snitzer77304d22010-11-08 14:39:12 +0100127 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
David Woodhoused30a2602008-08-11 15:58:42 +0100128 return -EINVAL;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700129 if (secure)
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200130 flags |= BLKDEV_DISCARD_SECURE;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700131 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
David Woodhoused30a2602008-08-11 15:58:42 +0100132}
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134static int put_ushort(unsigned long arg, unsigned short val)
135{
136 return put_user(val, (unsigned short __user *)arg);
137}
138
139static int put_int(unsigned long arg, int val)
140{
141 return put_user(val, (int __user *)arg);
142}
143
Martin K. Petersenac481c22009-10-03 20:52:01 +0200144static int put_uint(unsigned long arg, unsigned int val)
145{
146 return put_user(val, (unsigned int __user *)arg);
147}
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149static int put_long(unsigned long arg, long val)
150{
151 return put_user(val, (long __user *)arg);
152}
153
154static int put_ulong(unsigned long arg, unsigned long val)
155{
156 return put_user(val, (unsigned long __user *)arg);
157}
158
159static int put_u64(unsigned long arg, u64 val)
160{
161 return put_user(val, (u64 __user *)arg);
162}
163
Al Viro633a08b2007-08-29 20:34:12 -0400164int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
165 unsigned cmd, unsigned long arg)
166{
167 struct gendisk *disk = bdev->bd_disk;
Al Virod4430d622008-03-02 09:09:22 -0500168
169 if (disk->fops->ioctl)
170 return disk->fops->ioctl(bdev, mode, cmd, arg);
171
Al Viro633a08b2007-08-29 20:34:12 -0400172 return -ENOTTY;
173}
174/*
175 * For the record: _GPL here is only because somebody decided to slap it
176 * on the previous export. Sheer idiocy, since it wasn't copyrightable
177 * at all and could be open-coded without any exports by anybody who cares.
178 */
179EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
180
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200181/*
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200182 * always keep this in sync with compat_blkdev_ioctl()
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200183 */
Al Viro56b26ad2008-09-19 03:17:36 -0400184int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700185 unsigned long arg)
186{
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700187 struct gendisk *disk = bdev->bd_disk;
Al Viro45048d02008-09-18 15:53:24 -0400188 struct backing_dev_info *bdi;
189 loff_t size;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700190 int ret, n;
191
192 switch(cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 case BLKFLSBUF:
194 if (!capable(CAP_SYS_ADMIN))
195 return -EACCES;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700196
Al Viroe436fda2008-09-18 03:38:12 -0400197 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700198 /* -EINVAL to handle old uncorrected drivers */
199 if (ret != -EINVAL && ret != -ENOTTY)
200 return ret;
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 fsync_bdev(bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700203 invalidate_bdev(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 return 0;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 case BLKROSET:
Al Viroe436fda2008-09-18 03:38:12 -0400207 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700208 /* -EINVAL to handle old uncorrected drivers */
209 if (ret != -EINVAL && ret != -ENOTTY)
210 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 if (!capable(CAP_SYS_ADMIN))
212 return -EACCES;
213 if (get_user(n, (int __user *)(arg)))
214 return -EFAULT;
215 set_device_ro(bdev, n);
216 return 0;
David Woodhoused30a2602008-08-11 15:58:42 +0100217
Adrian Hunter8d57a982010-08-11 14:17:49 -0700218 case BLKDISCARD:
219 case BLKSECDISCARD: {
David Woodhoused30a2602008-08-11 15:58:42 +0100220 uint64_t range[2];
221
Al Viroe436fda2008-09-18 03:38:12 -0400222 if (!(mode & FMODE_WRITE))
David Woodhoused30a2602008-08-11 15:58:42 +0100223 return -EBADF;
224
225 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
226 return -EFAULT;
227
Adrian Hunter8d57a982010-08-11 14:17:49 -0700228 return blk_ioctl_discard(bdev, range[0], range[1],
229 cmd == BLKSECDISCARD);
David Woodhoused30a2602008-08-11 15:58:42 +0100230 }
231
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800232 case HDIO_GETGEO: {
233 struct hd_geometry geo;
234
235 if (!arg)
236 return -EINVAL;
237 if (!disk->fops->getgeo)
238 return -ENOTTY;
239
240 /*
241 * We need to set the startsect first, the driver may
242 * want to override it.
243 */
Vasiliy Kulikova0147412010-11-08 14:42:40 +0100244 memset(&geo, 0, sizeof(geo));
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800245 geo.start = get_start_sect(bdev);
246 ret = disk->fops->getgeo(bdev, &geo);
247 if (ret)
248 return ret;
249 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
250 sizeof(geo)))
251 return -EFAULT;
252 return 0;
253 }
Al Viro45048d02008-09-18 15:53:24 -0400254 case BLKRAGET:
255 case BLKFRAGET:
256 if (!arg)
257 return -EINVAL;
258 bdi = blk_get_backing_dev_info(bdev);
259 if (bdi == NULL)
260 return -ENOTTY;
261 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
262 case BLKROGET:
263 return put_int(arg, bdev_read_only(bdev) != 0);
Martin K. Petersenac481c22009-10-03 20:52:01 +0200264 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
Al Viro45048d02008-09-18 15:53:24 -0400265 return put_int(arg, block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200266 case BLKSSZGET: /* get block device logical block size */
Martin K. Petersene1defc42009-05-22 17:17:49 -0400267 return put_int(arg, bdev_logical_block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200268 case BLKPBSZGET: /* get block device physical block size */
269 return put_uint(arg, bdev_physical_block_size(bdev));
270 case BLKIOMIN:
271 return put_uint(arg, bdev_io_min(bdev));
272 case BLKIOOPT:
273 return put_uint(arg, bdev_io_opt(bdev));
274 case BLKALIGNOFF:
275 return put_int(arg, bdev_alignment_offset(bdev));
Martin K. Petersen98262f22009-12-03 09:24:48 +0100276 case BLKDISCARDZEROES:
277 return put_uint(arg, bdev_discard_zeroes_data(bdev));
Al Viro45048d02008-09-18 15:53:24 -0400278 case BLKSECTGET:
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400279 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
Al Viro45048d02008-09-18 15:53:24 -0400280 case BLKRASET:
281 case BLKFRASET:
282 if(!capable(CAP_SYS_ADMIN))
283 return -EACCES;
284 bdi = blk_get_backing_dev_info(bdev);
285 if (bdi == NULL)
286 return -ENOTTY;
Al Viro45048d02008-09-18 15:53:24 -0400287 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
Al Viro45048d02008-09-18 15:53:24 -0400288 return 0;
289 case BLKBSZSET:
290 /* set the logical block size */
291 if (!capable(CAP_SYS_ADMIN))
292 return -EACCES;
293 if (!arg)
294 return -EINVAL;
295 if (get_user(n, (int __user *) arg))
296 return -EFAULT;
Miklos Szeredi3c522ce2011-02-24 15:45:41 +0100297 if (!(mode & FMODE_EXCL)) {
298 bdgrab(bdev);
299 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
300 return -EBUSY;
301 }
Al Viro45048d02008-09-18 15:53:24 -0400302 ret = set_blocksize(bdev, n);
Al Viro6af3a562008-09-19 03:08:13 -0400303 if (!(mode & FMODE_EXCL))
Tejun Heoe525fd82010-11-13 11:55:17 +0100304 blkdev_put(bdev, mode | FMODE_EXCL);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700305 return ret;
Al Viro45048d02008-09-18 15:53:24 -0400306 case BLKPG:
Al Viro45048d02008-09-18 15:53:24 -0400307 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400308 break;
309 case BLKRRPART:
Al Viro45048d02008-09-18 15:53:24 -0400310 ret = blkdev_reread_part(bdev);
Al Viro45048d02008-09-18 15:53:24 -0400311 break;
312 case BLKGETSIZE:
Mike Snitzer77304d22010-11-08 14:39:12 +0100313 size = i_size_read(bdev->bd_inode);
Al Viro45048d02008-09-18 15:53:24 -0400314 if ((size >> 9) > ~0UL)
315 return -EFBIG;
316 return put_ulong(arg, size >> 9);
317 case BLKGETSIZE64:
Mike Snitzer77304d22010-11-08 14:39:12 +0100318 return put_u64(arg, i_size_read(bdev->bd_inode));
Al Viro45048d02008-09-18 15:53:24 -0400319 case BLKTRACESTART:
320 case BLKTRACESTOP:
321 case BLKTRACESETUP:
322 case BLKTRACETEARDOWN:
Al Viro45048d02008-09-18 15:53:24 -0400323 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400324 break;
325 default:
326 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
327 }
328 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329}
Stephen Tweedie68f66fe2005-05-13 23:31:19 -0400330EXPORT_SYMBOL_GPL(blkdev_ioctl);