blob: 4828fa34981314f34555a2e85ed381d660d9fa3b [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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135static int put_ushort(unsigned long arg, unsigned short val)
136{
137 return put_user(val, (unsigned short __user *)arg);
138}
139
140static int put_int(unsigned long arg, int val)
141{
142 return put_user(val, (int __user *)arg);
143}
144
Martin K. Petersenac481c22009-10-03 20:52:01 +0200145static int put_uint(unsigned long arg, unsigned int val)
146{
147 return put_user(val, (unsigned int __user *)arg);
148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150static int put_long(unsigned long arg, long val)
151{
152 return put_user(val, (long __user *)arg);
153}
154
155static int put_ulong(unsigned long arg, unsigned long val)
156{
157 return put_user(val, (unsigned long __user *)arg);
158}
159
160static int put_u64(unsigned long arg, u64 val)
161{
162 return put_user(val, (u64 __user *)arg);
163}
164
Al Viro633a08b2007-08-29 20:34:12 -0400165int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
166 unsigned cmd, unsigned long arg)
167{
168 struct gendisk *disk = bdev->bd_disk;
Al Virod4430d62008-03-02 09:09:22 -0500169
170 if (disk->fops->ioctl)
171 return disk->fops->ioctl(bdev, mode, cmd, arg);
172
Al Viro633a08b2007-08-29 20:34:12 -0400173 return -ENOTTY;
174}
175/*
176 * For the record: _GPL here is only because somebody decided to slap it
177 * on the previous export. Sheer idiocy, since it wasn't copyrightable
178 * at all and could be open-coded without any exports by anybody who cares.
179 */
180EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
181
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200182/*
Linus Torvalds07d106d2012-01-05 15:40:12 -0800183 * Is it an unrecognized ioctl? The correct returns are either
184 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
185 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
186 * code before returning.
187 *
188 * Confused drivers sometimes return EINVAL, which is wrong. It
189 * means "I understood the ioctl command, but the parameters to
190 * it were wrong".
191 *
192 * We should aim to just fix the broken drivers, the EINVAL case
193 * should go away.
194 */
195static inline int is_unrecognized_ioctl(int ret)
196{
197 return ret == -EINVAL ||
198 ret == -ENOTTY ||
199 ret == -ENOIOCTLCMD;
200}
201
202/*
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200203 * always keep this in sync with compat_blkdev_ioctl()
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200204 */
Al Viro56b26ad2008-09-19 03:17:36 -0400205int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700206 unsigned long arg)
207{
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700208 struct gendisk *disk = bdev->bd_disk;
Al Viro45048d02008-09-18 15:53:24 -0400209 struct backing_dev_info *bdi;
210 loff_t size;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700211 int ret, n;
212
213 switch(cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 case BLKFLSBUF:
215 if (!capable(CAP_SYS_ADMIN))
216 return -EACCES;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700217
Al Viroe436fda2008-09-18 03:38:12 -0400218 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Linus Torvalds07d106d2012-01-05 15:40:12 -0800219 if (!is_unrecognized_ioctl(ret))
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700220 return ret;
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 fsync_bdev(bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700223 invalidate_bdev(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return 0;
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 case BLKROSET:
Al Viroe436fda2008-09-18 03:38:12 -0400227 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
Linus Torvalds07d106d2012-01-05 15:40:12 -0800228 if (!is_unrecognized_ioctl(ret))
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700229 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (!capable(CAP_SYS_ADMIN))
231 return -EACCES;
232 if (get_user(n, (int __user *)(arg)))
233 return -EFAULT;
234 set_device_ro(bdev, n);
235 return 0;
David Woodhoused30a2602008-08-11 15:58:42 +0100236
Adrian Hunter8d57a982010-08-11 14:17:49 -0700237 case BLKDISCARD:
238 case BLKSECDISCARD: {
David Woodhoused30a2602008-08-11 15:58:42 +0100239 uint64_t range[2];
240
Al Viroe436fda2008-09-18 03:38:12 -0400241 if (!(mode & FMODE_WRITE))
David Woodhoused30a2602008-08-11 15:58:42 +0100242 return -EBADF;
243
244 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
245 return -EFAULT;
246
Adrian Hunter8d57a982010-08-11 14:17:49 -0700247 return blk_ioctl_discard(bdev, range[0], range[1],
248 cmd == BLKSECDISCARD);
David Woodhoused30a2602008-08-11 15:58:42 +0100249 }
250
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800251 case HDIO_GETGEO: {
252 struct hd_geometry geo;
253
254 if (!arg)
255 return -EINVAL;
256 if (!disk->fops->getgeo)
257 return -ENOTTY;
258
259 /*
260 * We need to set the startsect first, the driver may
261 * want to override it.
262 */
Vasiliy Kulikova0147412010-11-08 14:42:40 +0100263 memset(&geo, 0, sizeof(geo));
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800264 geo.start = get_start_sect(bdev);
265 ret = disk->fops->getgeo(bdev, &geo);
266 if (ret)
267 return ret;
268 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
269 sizeof(geo)))
270 return -EFAULT;
271 return 0;
272 }
Al Viro45048d02008-09-18 15:53:24 -0400273 case BLKRAGET:
274 case BLKFRAGET:
275 if (!arg)
276 return -EINVAL;
277 bdi = blk_get_backing_dev_info(bdev);
278 if (bdi == NULL)
279 return -ENOTTY;
280 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
281 case BLKROGET:
282 return put_int(arg, bdev_read_only(bdev) != 0);
Martin K. Petersenac481c22009-10-03 20:52:01 +0200283 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
Al Viro45048d02008-09-18 15:53:24 -0400284 return put_int(arg, block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200285 case BLKSSZGET: /* get block device logical block size */
Martin K. Petersene1defc42009-05-22 17:17:49 -0400286 return put_int(arg, bdev_logical_block_size(bdev));
Martin K. Petersenac481c22009-10-03 20:52:01 +0200287 case BLKPBSZGET: /* get block device physical block size */
288 return put_uint(arg, bdev_physical_block_size(bdev));
289 case BLKIOMIN:
290 return put_uint(arg, bdev_io_min(bdev));
291 case BLKIOOPT:
292 return put_uint(arg, bdev_io_opt(bdev));
293 case BLKALIGNOFF:
294 return put_int(arg, bdev_alignment_offset(bdev));
Martin K. Petersen98262f22009-12-03 09:24:48 +0100295 case BLKDISCARDZEROES:
296 return put_uint(arg, bdev_discard_zeroes_data(bdev));
Al Viro45048d02008-09-18 15:53:24 -0400297 case BLKSECTGET:
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400298 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
Al Viro45048d02008-09-18 15:53:24 -0400299 case BLKRASET:
300 case BLKFRASET:
301 if(!capable(CAP_SYS_ADMIN))
302 return -EACCES;
303 bdi = blk_get_backing_dev_info(bdev);
304 if (bdi == NULL)
305 return -ENOTTY;
Al Viro45048d02008-09-18 15:53:24 -0400306 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
Al Viro45048d02008-09-18 15:53:24 -0400307 return 0;
308 case BLKBSZSET:
309 /* set the logical block size */
310 if (!capable(CAP_SYS_ADMIN))
311 return -EACCES;
312 if (!arg)
313 return -EINVAL;
314 if (get_user(n, (int __user *) arg))
315 return -EFAULT;
Miklos Szeredi3c522ce2011-02-24 15:45:41 +0100316 if (!(mode & FMODE_EXCL)) {
317 bdgrab(bdev);
318 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
319 return -EBUSY;
320 }
Al Viro45048d02008-09-18 15:53:24 -0400321 ret = set_blocksize(bdev, n);
Al Viro6af3a562008-09-19 03:08:13 -0400322 if (!(mode & FMODE_EXCL))
Tejun Heoe525fd82010-11-13 11:55:17 +0100323 blkdev_put(bdev, mode | FMODE_EXCL);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -0700324 return ret;
Al Viro45048d02008-09-18 15:53:24 -0400325 case BLKPG:
Al Viro45048d02008-09-18 15:53:24 -0400326 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400327 break;
328 case BLKRRPART:
Al Viro45048d02008-09-18 15:53:24 -0400329 ret = blkdev_reread_part(bdev);
Al Viro45048d02008-09-18 15:53:24 -0400330 break;
331 case BLKGETSIZE:
Mike Snitzer77304d22010-11-08 14:39:12 +0100332 size = i_size_read(bdev->bd_inode);
Al Viro45048d02008-09-18 15:53:24 -0400333 if ((size >> 9) > ~0UL)
334 return -EFBIG;
335 return put_ulong(arg, size >> 9);
336 case BLKGETSIZE64:
Mike Snitzer77304d22010-11-08 14:39:12 +0100337 return put_u64(arg, i_size_read(bdev->bd_inode));
Al Viro45048d02008-09-18 15:53:24 -0400338 case BLKTRACESTART:
339 case BLKTRACESTOP:
340 case BLKTRACESETUP:
341 case BLKTRACETEARDOWN:
Al Viro45048d02008-09-18 15:53:24 -0400342 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
Al Viro45048d02008-09-18 15:53:24 -0400343 break;
344 default:
345 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
346 }
347 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
Stephen Tweedie68f66fe2005-05-13 23:31:19 -0400349EXPORT_SYMBOL_GPL(blkdev_ioctl);