blob: dd76ba09aa732f4256c29971ed6636ca39460133 [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;
Tejun Heoe71bf0d2008-09-03 09:03:02 +020016 struct hd_struct *part;
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;
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 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;
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 Heod27769e2011-08-23 20:01:04 +0200105 if (!disk_part_scan_enabled(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 int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
Adrian Hunter8d57a982010-08-11 14:17:49 -0700117 uint64_t len, int secure)
David Woodhoused30a2602008-08-11 15:58:42 +0100118{
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200119 unsigned long flags = 0;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700120
David Woodhoused30a2602008-08-11 15:58:42 +0100121 if (start & 511)
122 return -EINVAL;
123 if (len & 511)
124 return -EINVAL;
125 start >>= 9;
126 len >>= 9;
127
Mike Snitzer77304d22010-11-08 14:39:12 +0100128 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
David Woodhoused30a2602008-08-11 15:58:42 +0100129 return -EINVAL;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700130 if (secure)
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200131 flags |= BLKDEV_DISCARD_SECURE;
Adrian Hunter8d57a982010-08-11 14:17:49 -0700132 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
David Woodhoused30a2602008-08-11 15:58:42 +0100133}
134
Maya Erez73937f52012-05-24 23:33:05 +0300135static int blk_ioctl_sanitize(struct block_device *bdev)
136{
137 return blkdev_issue_sanitize(bdev, GFP_KERNEL);
138}
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140static int put_ushort(unsigned long arg, unsigned short val)
141{
142 return put_user(val, (unsigned short __user *)arg);
143}
144
145static int put_int(unsigned long arg, int val)
146{
147 return put_user(val, (int __user *)arg);
148}
149
Martin K. Petersenac481c22009-10-03 20:52:01 +0200150static int put_uint(unsigned long arg, unsigned int val)
151{
152 return put_user(val, (unsigned int __user *)arg);
153}
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155static int put_long(unsigned long arg, long val)
156{
157 return put_user(val, (long __user *)arg);
158}
159
160static int put_ulong(unsigned long arg, unsigned long val)
161{
162 return put_user(val, (unsigned long __user *)arg);
163}
164
165static int put_u64(unsigned long arg, u64 val)
166{
167 return put_user(val, (u64 __user *)arg);
168}
169
Al Viro633a08b2007-08-29 20:34:12 -0400170int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
171 unsigned cmd, unsigned long arg)
172{
173 struct gendisk *disk = bdev->bd_disk;
Al Virod4430d62008-03-02 09:09:22 -0500174
175 if (disk->fops->ioctl)
176 return disk->fops->ioctl(bdev, mode, cmd, arg);
177
Al Viro633a08b2007-08-29 20:34:12 -0400178 return -ENOTTY;
179}
180/*
181 * For the record: _GPL here is only because somebody decided to slap it
182 * on the previous export. Sheer idiocy, since it wasn't copyrightable
183 * at all and could be open-coded without any exports by anybody who cares.
184 */
185EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
186
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200187/*
Linus Torvalds07d106d2012-01-05 15:40:12 -0800188 * Is it an unrecognized ioctl? The correct returns are either
189 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
190 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
191 * code before returning.
192 *
193 * Confused drivers sometimes return EINVAL, which is wrong. It
194 * means "I understood the ioctl command, but the parameters to
195 * it were wrong".
196 *
197 * We should aim to just fix the broken drivers, the EINVAL case
198 * should go away.
199 */
200static inline int is_unrecognized_ioctl(int ret)
201{
202 return ret == -EINVAL ||
203 ret == -ENOTTY ||
204 ret == -ENOIOCTLCMD;
205}
206
207/*
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200208 * always keep this in sync with compat_blkdev_ioctl()
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200209 */
Al Viro56b26ad2008-09-19 03:17:36 -0400210int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700211 unsigned long arg)
212{
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700213 struct gendisk *disk = bdev->bd_disk;
Al Viro45048d02008-09-18 15:53:24 -0400214 struct backing_dev_info *bdi;
215 loff_t size;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700216 int ret, n;
217
218 switch(cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 case BLKFLSBUF:
220 if (!capable(CAP_SYS_ADMIN))
221 return -EACCES;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700222
Al Viroe436fda2008-09-18 03:38:12 -0400223 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Linus Torvalds07d106d2012-01-05 15:40:12 -0800224 if (!is_unrecognized_ioctl(ret))
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700225 return ret;
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 fsync_bdev(bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700228 invalidate_bdev(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return 0;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 case BLKROSET:
Al Viroe436fda2008-09-18 03:38:12 -0400232 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Linus Torvalds07d106d2012-01-05 15:40:12 -0800233 if (!is_unrecognized_ioctl(ret))
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700234 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (!capable(CAP_SYS_ADMIN))
236 return -EACCES;
237 if (get_user(n, (int __user *)(arg)))
238 return -EFAULT;
239 set_device_ro(bdev, n);
240 return 0;
David Woodhoused30a2602008-08-11 15:58:42 +0100241
Maya Erez73937f52012-05-24 23:33:05 +0300242 case BLKSANITIZE:
243 ret = blk_ioctl_sanitize(bdev);
244 break;
245
Adrian Hunter8d57a982010-08-11 14:17:49 -0700246 case BLKDISCARD:
247 case BLKSECDISCARD: {
David Woodhoused30a2602008-08-11 15:58:42 +0100248 uint64_t range[2];
249
Al Viroe436fda2008-09-18 03:38:12 -0400250 if (!(mode & FMODE_WRITE))
David Woodhoused30a2602008-08-11 15:58:42 +0100251 return -EBADF;
252
253 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
254 return -EFAULT;
255
Adrian Hunter8d57a982010-08-11 14:17:49 -0700256 return blk_ioctl_discard(bdev, range[0], range[1],
257 cmd == BLKSECDISCARD);
David Woodhoused30a2602008-08-11 15:58:42 +0100258 }
259
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800260 case HDIO_GETGEO: {
261 struct hd_geometry geo;
262
263 if (!arg)
264 return -EINVAL;
265 if (!disk->fops->getgeo)
266 return -ENOTTY;
267
268 /*
269 * We need to set the startsect first, the driver may
270 * want to override it.
271 */
Vasiliy Kulikova0147412010-11-08 14:42:40 +0100272 memset(&geo, 0, sizeof(geo));
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800273 geo.start = get_start_sect(bdev);
274 ret = disk->fops->getgeo(bdev, &geo);
275 if (ret)
276 return ret;
277 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
278 sizeof(geo)))
279 return -EFAULT;
280 return 0;
281 }
Al Viro45048d02008-09-18 15:53:24 -0400282 case BLKRAGET:
283 case BLKFRAGET:
284 if (!arg)
285 return -EINVAL;
286 bdi = blk_get_backing_dev_info(bdev);
287 if (bdi == NULL)
288 return -ENOTTY;
289 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
290 case BLKROGET:
291 return put_int(arg, bdev_read_only(bdev) != 0);
Martin K. Petersenac481c22009-10-03 20:52:01 +0200292 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
Al Viro45048d02008-09-18 15:53:24 -0400293 return put_int(arg, block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200294 case BLKSSZGET: /* get block device logical block size */
Martin K. Petersene1defc42009-05-22 17:17:49 -0400295 return put_int(arg, bdev_logical_block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200296 case BLKPBSZGET: /* get block device physical block size */
297 return put_uint(arg, bdev_physical_block_size(bdev));
298 case BLKIOMIN:
299 return put_uint(arg, bdev_io_min(bdev));
300 case BLKIOOPT:
301 return put_uint(arg, bdev_io_opt(bdev));
302 case BLKALIGNOFF:
303 return put_int(arg, bdev_alignment_offset(bdev));
Martin K. Petersen98262f22009-12-03 09:24:48 +0100304 case BLKDISCARDZEROES:
305 return put_uint(arg, bdev_discard_zeroes_data(bdev));
Al Viro45048d02008-09-18 15:53:24 -0400306 case BLKSECTGET:
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400307 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
Martin K. Petersenef00f592012-01-11 16:29:31 +0100308 case BLKROTATIONAL:
309 return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
Al Viro45048d02008-09-18 15:53:24 -0400310 case BLKRASET:
311 case BLKFRASET:
312 if(!capable(CAP_SYS_ADMIN))
313 return -EACCES;
314 bdi = blk_get_backing_dev_info(bdev);
315 if (bdi == NULL)
316 return -ENOTTY;
Al Viro45048d02008-09-18 15:53:24 -0400317 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
Al Viro45048d02008-09-18 15:53:24 -0400318 return 0;
319 case BLKBSZSET:
320 /* set the logical block size */
321 if (!capable(CAP_SYS_ADMIN))
322 return -EACCES;
323 if (!arg)
324 return -EINVAL;
325 if (get_user(n, (int __user *) arg))
326 return -EFAULT;
Miklos Szeredi3c522ce2011-02-24 15:45:41 +0100327 if (!(mode & FMODE_EXCL)) {
328 bdgrab(bdev);
329 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
330 return -EBUSY;
331 }
Al Viro45048d02008-09-18 15:53:24 -0400332 ret = set_blocksize(bdev, n);
Al Viro6af3a562008-09-19 03:08:13 -0400333 if (!(mode & FMODE_EXCL))
Tejun Heoe525fd82010-11-13 11:55:17 +0100334 blkdev_put(bdev, mode | FMODE_EXCL);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700335 return ret;
Al Viro45048d02008-09-18 15:53:24 -0400336 case BLKPG:
Al Viro45048d02008-09-18 15:53:24 -0400337 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400338 break;
339 case BLKRRPART:
Al Viro45048d02008-09-18 15:53:24 -0400340 ret = blkdev_reread_part(bdev);
Al Viro45048d02008-09-18 15:53:24 -0400341 break;
342 case BLKGETSIZE:
Mike Snitzer77304d22010-11-08 14:39:12 +0100343 size = i_size_read(bdev->bd_inode);
Al Viro45048d02008-09-18 15:53:24 -0400344 if ((size >> 9) > ~0UL)
345 return -EFBIG;
346 return put_ulong(arg, size >> 9);
347 case BLKGETSIZE64:
Mike Snitzer77304d22010-11-08 14:39:12 +0100348 return put_u64(arg, i_size_read(bdev->bd_inode));
Al Viro45048d02008-09-18 15:53:24 -0400349 case BLKTRACESTART:
350 case BLKTRACESTOP:
351 case BLKTRACESETUP:
352 case BLKTRACETEARDOWN:
Al Viro45048d02008-09-18 15:53:24 -0400353 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400354 break;
355 default:
356 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
357 }
358 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
Stephen Tweedie68f66fe2005-05-13 23:31:19 -0400360EXPORT_SYMBOL_GPL(blkdev_ioctl);