1#include <linux/capability.h>
2#include <linux/blkdev.h>
3#include <linux/gfp.h>
4#include <linux/blkpg.h>
5#include <linux/hdreg.h>
6#include <linux/backing-dev.h>
7#include <linux/buffer_head.h>
8#include <linux/smp_lock.h>
9#include <linux/blktrace_api.h>
10#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;
16 struct hd_struct *part;
17 struct blkpg_ioctl_arg a;
18 struct blkpg_partition p;
19 struct disk_part_iter piter;
20 long long start, length;
21 int partno;
22
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;
32 partno = p.pno;
33 if (partno <= 0)
34 return -EINVAL;
35 switch (a.op) {
36 case BLKPG_ADD_PARTITION:
37 start = p.start >> 9;
38 length = p.length >> 9;
39
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 }
47
48 mutex_lock(&bdev->bd_mutex);
49
50
51 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);
57 mutex_unlock(&bdev->bd_mutex);
58 return -EBUSY;
59 }
60 }
61 disk_part_iter_exit(&piter);
62
63
64 part = add_partition(disk, partno, start, length,
65 ADDPART_FLAG_NONE);
66 mutex_unlock(&bdev->bd_mutex);
67 return IS_ERR(part) ? PTR_ERR(part) : 0;
68 case BLKPG_DEL_PARTITION:
69 part = disk_get_part(disk, partno);
70 if (!part)
71 return -ENXIO;
72
73 bdevp = bdget(part_devt(part));
74 disk_put_part(part);
75 if (!bdevp)
76 return -ENOMEM;
77
78 mutex_lock(&bdevp->bd_mutex);
79 if (bdevp->bd_openers) {
80 mutex_unlock(&bdevp->bd_mutex);
81 bdput(bdevp);
82 return -EBUSY;
83 }
84
85 fsync_bdev(bdevp);
86 invalidate_bdev(bdevp);
87
88 mutex_lock_nested(&bdev->bd_mutex, 1);
89 delete_partition(disk, partno);
90 mutex_unlock(&bdev->bd_mutex);
91 mutex_unlock(&bdevp->bd_mutex);
92 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
105 if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
106 return -EINVAL;
107 if (!capable(CAP_SYS_ADMIN))
108 return -EACCES;
109 if (!mutex_trylock(&bdev->bd_mutex))
110 return -EBUSY;
111 res = rescan_partitions(disk, bdev);
112 mutex_unlock(&bdev->bd_mutex);
113 return res;
114}
115
116static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
117 uint64_t len)
118{
119 if (start & 511)
120 return -EINVAL;
121 if (len & 511)
122 return -EINVAL;
123 start >>= 9;
124 len >>= 9;
125
126 if (start + len > (bdev->bd_inode->i_size >> 9))
127 return -EINVAL;
128 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
129 BLKDEV_IFL_WAIT);
130}
131
132static int put_ushort(unsigned long arg, unsigned short val)
133{
134 return put_user(val, (unsigned short __user *)arg);
135}
136
137static int put_int(unsigned long arg, int val)
138{
139 return put_user(val, (int __user *)arg);
140}
141
142static int put_uint(unsigned long arg, unsigned int val)
143{
144 return put_user(val, (unsigned int __user *)arg);
145}
146
147static int put_long(unsigned long arg, long val)
148{
149 return put_user(val, (long __user *)arg);
150}
151
152static int put_ulong(unsigned long arg, unsigned long val)
153{
154 return put_user(val, (unsigned long __user *)arg);
155}
156
157static int put_u64(unsigned long arg, u64 val)
158{
159 return put_user(val, (u64 __user *)arg);
160}
161
162int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
163 unsigned cmd, unsigned long arg)
164{
165 struct gendisk *disk = bdev->bd_disk;
166 int ret;
167
168 if (disk->fops->ioctl)
169 return disk->fops->ioctl(bdev, mode, cmd, arg);
170
171 if (disk->fops->locked_ioctl) {
172 lock_kernel();
173 ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
174 unlock_kernel();
175 return ret;
176 }
177
178 return -ENOTTY;
179}
180
181
182
183
184
185EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
186
187
188
189
190
191int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
192 unsigned long arg)
193{
194 struct gendisk *disk = bdev->bd_disk;
195 struct backing_dev_info *bdi;
196 loff_t size;
197 int ret, n;
198
199 switch(cmd) {
200 case BLKFLSBUF:
201 if (!capable(CAP_SYS_ADMIN))
202 return -EACCES;
203
204 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
205
206 if (ret != -EINVAL && ret != -ENOTTY)
207 return ret;
208
209 lock_kernel();
210 fsync_bdev(bdev);
211 invalidate_bdev(bdev);
212 unlock_kernel();
213 return 0;
214
215 case BLKROSET:
216 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
217
218 if (ret != -EINVAL && ret != -ENOTTY)
219 return ret;
220 if (!capable(CAP_SYS_ADMIN))
221 return -EACCES;
222 if (get_user(n, (int __user *)(arg)))
223 return -EFAULT;
224 lock_kernel();
225 set_device_ro(bdev, n);
226 unlock_kernel();
227 return 0;
228
229 case BLKDISCARD: {
230 uint64_t range[2];
231
232 if (!(mode & FMODE_WRITE))
233 return -EBADF;
234
235 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
236 return -EFAULT;
237
238 return blk_ioctl_discard(bdev, range[0], range[1]);
239 }
240
241 case HDIO_GETGEO: {
242 struct hd_geometry geo;
243
244 if (!arg)
245 return -EINVAL;
246 if (!disk->fops->getgeo)
247 return -ENOTTY;
248
249
250
251
252
253 geo.start = get_start_sect(bdev);
254 ret = disk->fops->getgeo(bdev, &geo);
255 if (ret)
256 return ret;
257 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
258 sizeof(geo)))
259 return -EFAULT;
260 return 0;
261 }
262 case BLKRAGET:
263 case BLKFRAGET:
264 if (!arg)
265 return -EINVAL;
266 bdi = blk_get_backing_dev_info(bdev);
267 if (bdi == NULL)
268 return -ENOTTY;
269 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
270 case BLKROGET:
271 return put_int(arg, bdev_read_only(bdev) != 0);
272 case BLKBSZGET:
273 return put_int(arg, block_size(bdev));
274 case BLKSSZGET:
275 return put_int(arg, bdev_logical_block_size(bdev));
276 case BLKPBSZGET:
277 return put_uint(arg, bdev_physical_block_size(bdev));
278 case BLKIOMIN:
279 return put_uint(arg, bdev_io_min(bdev));
280 case BLKIOOPT:
281 return put_uint(arg, bdev_io_opt(bdev));
282 case BLKALIGNOFF:
283 return put_int(arg, bdev_alignment_offset(bdev));
284 case BLKDISCARDZEROES:
285 return put_uint(arg, bdev_discard_zeroes_data(bdev));
286 case BLKSECTGET:
287 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
288 case BLKRASET:
289 case BLKFRASET:
290 if(!capable(CAP_SYS_ADMIN))
291 return -EACCES;
292 bdi = blk_get_backing_dev_info(bdev);
293 if (bdi == NULL)
294 return -ENOTTY;
295 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
296 return 0;
297 case BLKBSZSET:
298
299 if (!capable(CAP_SYS_ADMIN))
300 return -EACCES;
301 if (!arg)
302 return -EINVAL;
303 if (get_user(n, (int __user *) arg))
304 return -EFAULT;
305 if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
306 return -EBUSY;
307 ret = set_blocksize(bdev, n);
308 if (!(mode & FMODE_EXCL))
309 bd_release(bdev);
310 return ret;
311 case BLKPG:
312 lock_kernel();
313 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
314 unlock_kernel();
315 break;
316 case BLKRRPART:
317 lock_kernel();
318 ret = blkdev_reread_part(bdev);
319 unlock_kernel();
320 break;
321 case BLKGETSIZE:
322 size = bdev->bd_inode->i_size;
323 if ((size >> 9) > ~0UL)
324 return -EFBIG;
325 return put_ulong(arg, size >> 9);
326 case BLKGETSIZE64:
327 return put_u64(arg, bdev->bd_inode->i_size);
328 case BLKTRACESTART:
329 case BLKTRACESTOP:
330 case BLKTRACESETUP:
331 case BLKTRACETEARDOWN:
332 lock_kernel();
333 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
334 unlock_kernel();
335 break;
336 default:
337 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
338 }
339 return ret;
340}
341EXPORT_SYMBOL_GPL(blkdev_ioctl);
342
