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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;
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,
64 ADDPART_FLAG_NONE);
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,
116 uint64_t len)
117{
David Woodhoused30a2602008-08-11 15:58:42 +0100118 if (start & 511)
119 return -EINVAL;
120 if (len & 511)
121 return -EINVAL;
122 start >>= 9;
123 len >>= 9;
124
125 if (start + len > (bdev->bd_inode->i_size >> 9))
126 return -EINVAL;
Christoph Hellwig746cd1e2009-09-12 07:35:43 +0200127 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
128 DISCARD_FL_WAIT);
David Woodhoused30a2602008-08-11 15:58:42 +0100129}
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131static int put_ushort(unsigned long arg, unsigned short val)
132{
133 return put_user(val, (unsigned short __user *)arg);
134}
135
136static int put_int(unsigned long arg, int val)
137{
138 return put_user(val, (int __user *)arg);
139}
140
Martin K. Petersenac481c22009-10-03 20:52:01 +0200141static int put_uint(unsigned long arg, unsigned int val)
142{
143 return put_user(val, (unsigned int __user *)arg);
144}
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146static int put_long(unsigned long arg, long val)
147{
148 return put_user(val, (long __user *)arg);
149}
150
151static int put_ulong(unsigned long arg, unsigned long val)
152{
153 return put_user(val, (unsigned long __user *)arg);
154}
155
156static int put_u64(unsigned long arg, u64 val)
157{
158 return put_user(val, (u64 __user *)arg);
159}
160
Al Viro633a08b2007-08-29 20:34:12 -0400161int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
162 unsigned cmd, unsigned long arg)
163{
164 struct gendisk *disk = bdev->bd_disk;
165 int ret;
Al Virod4430d62008-03-02 09:09:22 -0500166
167 if (disk->fops->ioctl)
168 return disk->fops->ioctl(bdev, mode, cmd, arg);
169
170 if (disk->fops->locked_ioctl) {
171 lock_kernel();
172 ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
Al Viro633a08b2007-08-29 20:34:12 -0400173 unlock_kernel();
174 return ret;
175 }
176
177 return -ENOTTY;
178}
179/*
180 * For the record: _GPL here is only because somebody decided to slap it
181 * on the previous export. Sheer idiocy, since it wasn't copyrightable
182 * at all and could be open-coded without any exports by anybody who cares.
183 */
184EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
185
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200186/*
187 * always keep this in sync with compat_blkdev_ioctl() and
188 * compat_blkdev_locked_ioctl()
189 */
Al Viro56b26ad2008-09-19 03:17:36 -0400190int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700191 unsigned long arg)
192{
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700193 struct gendisk *disk = bdev->bd_disk;
Al Viro45048d02008-09-18 15:53:24 -0400194 struct backing_dev_info *bdi;
195 loff_t size;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700196 int ret, n;
197
198 switch(cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 case BLKFLSBUF:
200 if (!capable(CAP_SYS_ADMIN))
201 return -EACCES;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700202
Al Viroe436fda2008-09-18 03:38:12 -0400203 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700204 /* -EINVAL to handle old uncorrected drivers */
205 if (ret != -EINVAL && ret != -ENOTTY)
206 return ret;
207
208 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 fsync_bdev(bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700210 invalidate_bdev(bdev);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700211 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 return 0;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 case BLKROSET:
Al Viroe436fda2008-09-18 03:38:12 -0400215 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700216 /* -EINVAL to handle old uncorrected drivers */
217 if (ret != -EINVAL && ret != -ENOTTY)
218 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 if (!capable(CAP_SYS_ADMIN))
220 return -EACCES;
221 if (get_user(n, (int __user *)(arg)))
222 return -EFAULT;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700223 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 set_device_ro(bdev, n);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700225 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return 0;
David Woodhoused30a2602008-08-11 15:58:42 +0100227
228 case BLKDISCARD: {
229 uint64_t range[2];
230
Al Viroe436fda2008-09-18 03:38:12 -0400231 if (!(mode & FMODE_WRITE))
David Woodhoused30a2602008-08-11 15:58:42 +0100232 return -EBADF;
233
234 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
235 return -EFAULT;
236
237 return blk_ioctl_discard(bdev, range[0], range[1]);
238 }
239
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800240 case HDIO_GETGEO: {
241 struct hd_geometry geo;
242
243 if (!arg)
244 return -EINVAL;
245 if (!disk->fops->getgeo)
246 return -ENOTTY;
247
248 /*
249 * We need to set the startsect first, the driver may
250 * want to override it.
251 */
252 geo.start = get_start_sect(bdev);
253 ret = disk->fops->getgeo(bdev, &geo);
254 if (ret)
255 return ret;
256 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
257 sizeof(geo)))
258 return -EFAULT;
259 return 0;
260 }
Al Viro45048d02008-09-18 15:53:24 -0400261 case BLKRAGET:
262 case BLKFRAGET:
263 if (!arg)
264 return -EINVAL;
265 bdi = blk_get_backing_dev_info(bdev);
266 if (bdi == NULL)
267 return -ENOTTY;
268 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
269 case BLKROGET:
270 return put_int(arg, bdev_read_only(bdev) != 0);
Martin K. Petersenac481c22009-10-03 20:52:01 +0200271 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
Al Viro45048d02008-09-18 15:53:24 -0400272 return put_int(arg, block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200273 case BLKSSZGET: /* get block device logical block size */
Martin K. Petersene1defc42009-05-22 17:17:49 -0400274 return put_int(arg, bdev_logical_block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200275 case BLKPBSZGET: /* get block device physical block size */
276 return put_uint(arg, bdev_physical_block_size(bdev));
277 case BLKIOMIN:
278 return put_uint(arg, bdev_io_min(bdev));
279 case BLKIOOPT:
280 return put_uint(arg, bdev_io_opt(bdev));
281 case BLKALIGNOFF:
282 return put_int(arg, bdev_alignment_offset(bdev));
Al Viro45048d02008-09-18 15:53:24 -0400283 case BLKSECTGET:
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400284 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
Al Viro45048d02008-09-18 15:53:24 -0400285 case BLKRASET:
286 case BLKFRASET:
287 if(!capable(CAP_SYS_ADMIN))
288 return -EACCES;
289 bdi = blk_get_backing_dev_info(bdev);
290 if (bdi == NULL)
291 return -ENOTTY;
Al Viro45048d02008-09-18 15:53:24 -0400292 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
Al Viro45048d02008-09-18 15:53:24 -0400293 return 0;
294 case BLKBSZSET:
295 /* set the logical block size */
296 if (!capable(CAP_SYS_ADMIN))
297 return -EACCES;
298 if (!arg)
299 return -EINVAL;
300 if (get_user(n, (int __user *) arg))
301 return -EFAULT;
Al Viro6af3a562008-09-19 03:08:13 -0400302 if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
Al Viro45048d02008-09-18 15:53:24 -0400303 return -EBUSY;
304 ret = set_blocksize(bdev, n);
Al Viro6af3a562008-09-19 03:08:13 -0400305 if (!(mode & FMODE_EXCL))
306 bd_release(bdev);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700307 return ret;
Al Viro45048d02008-09-18 15:53:24 -0400308 case BLKPG:
309 lock_kernel();
310 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
311 unlock_kernel();
312 break;
313 case BLKRRPART:
314 lock_kernel();
315 ret = blkdev_reread_part(bdev);
316 unlock_kernel();
317 break;
318 case BLKGETSIZE:
319 size = bdev->bd_inode->i_size;
320 if ((size >> 9) > ~0UL)
321 return -EFBIG;
322 return put_ulong(arg, size >> 9);
323 case BLKGETSIZE64:
324 return put_u64(arg, bdev->bd_inode->i_size);
325 case BLKTRACESTART:
326 case BLKTRACESTOP:
327 case BLKTRACESETUP:
328 case BLKTRACETEARDOWN:
329 lock_kernel();
330 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
331 unlock_kernel();
332 break;
333 default:
334 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
335 }
336 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337}
Stephen Tweedie68f66fe2005-05-13 23:31:19 -0400338EXPORT_SYMBOL_GPL(blkdev_ioctl);