Commit | Line | Data |
---|---|---|
c59ede7b | 1 | #include <linux/capability.h> |
1da177e4 LT |
2 | #include <linux/blkdev.h> |
3 | #include <linux/blkpg.h> | |
a885c8c4 | 4 | #include <linux/hdreg.h> |
1da177e4 LT |
5 | #include <linux/backing-dev.h> |
6 | #include <linux/buffer_head.h> | |
7 | #include <linux/smp_lock.h> | |
2056a782 | 8 | #include <linux/blktrace_api.h> |
1da177e4 LT |
9 | #include <asm/uaccess.h> |
10 | ||
11 | static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) | |
12 | { | |
13 | struct block_device *bdevp; | |
14 | struct gendisk *disk; | |
15 | struct blkpg_ioctl_arg a; | |
16 | struct blkpg_partition p; | |
17 | long long start, length; | |
18 | int part; | |
19 | int i; | |
04ebd4ae | 20 | int err; |
1da177e4 LT |
21 | |
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; | |
31 | part = p.pno; | |
32 | if (part <= 0 || part >= disk->minors) | |
33 | 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 | } | |
46 | /* partition number in use? */ | |
c039e313 | 47 | mutex_lock(&bdev->bd_mutex); |
1da177e4 | 48 | if (disk->part[part - 1]) { |
c039e313 | 49 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
50 | return -EBUSY; |
51 | } | |
52 | /* overlap? */ | |
53 | for (i = 0; i < disk->minors - 1; i++) { | |
54 | struct hd_struct *s = disk->part[i]; | |
55 | ||
56 | if (!s) | |
57 | continue; | |
58 | if (!(start+length <= s->start_sect || | |
59 | start >= s->start_sect + s->nr_sects)) { | |
c039e313 | 60 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
61 | return -EBUSY; |
62 | } | |
63 | } | |
64 | /* all seems OK */ | |
04ebd4ae | 65 | err = add_partition(disk, part, start, length, ADDPART_FLAG_NONE); |
c039e313 | 66 | mutex_unlock(&bdev->bd_mutex); |
04ebd4ae | 67 | return err; |
1da177e4 LT |
68 | case BLKPG_DEL_PARTITION: |
69 | if (!disk->part[part-1]) | |
70 | return -ENXIO; | |
71 | if (disk->part[part - 1]->nr_sects == 0) | |
72 | return -ENXIO; | |
73 | bdevp = bdget_disk(disk, part); | |
74 | if (!bdevp) | |
75 | return -ENOMEM; | |
2e7b651d | 76 | mutex_lock(&bdevp->bd_mutex); |
1da177e4 | 77 | if (bdevp->bd_openers) { |
c039e313 | 78 | mutex_unlock(&bdevp->bd_mutex); |
1da177e4 LT |
79 | bdput(bdevp); |
80 | return -EBUSY; | |
81 | } | |
82 | /* all seems OK */ | |
83 | fsync_bdev(bdevp); | |
f98393a6 | 84 | invalidate_bdev(bdevp); |
1da177e4 | 85 | |
6d740cd5 | 86 | mutex_lock_nested(&bdev->bd_mutex, 1); |
1da177e4 | 87 | delete_partition(disk, part); |
c039e313 AV |
88 | mutex_unlock(&bdev->bd_mutex); |
89 | mutex_unlock(&bdevp->bd_mutex); | |
1da177e4 LT |
90 | bdput(bdevp); |
91 | ||
92 | return 0; | |
93 | default: | |
94 | return -EINVAL; | |
95 | } | |
96 | } | |
97 | ||
98 | static int blkdev_reread_part(struct block_device *bdev) | |
99 | { | |
100 | struct gendisk *disk = bdev->bd_disk; | |
101 | int res; | |
102 | ||
103 | if (disk->minors == 1 || bdev != bdev->bd_contains) | |
104 | return -EINVAL; | |
105 | if (!capable(CAP_SYS_ADMIN)) | |
106 | return -EACCES; | |
c039e313 | 107 | if (!mutex_trylock(&bdev->bd_mutex)) |
1da177e4 LT |
108 | return -EBUSY; |
109 | res = rescan_partitions(disk, bdev); | |
c039e313 | 110 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
111 | return res; |
112 | } | |
113 | ||
d30a2605 DW |
114 | static void blk_ioc_discard_endio(struct bio *bio, int err) |
115 | { | |
116 | if (err) { | |
117 | if (err == -EOPNOTSUPP) | |
118 | set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); | |
119 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
120 | } | |
121 | complete(bio->bi_private); | |
122 | } | |
123 | ||
124 | static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, | |
125 | uint64_t len) | |
126 | { | |
127 | struct request_queue *q = bdev_get_queue(bdev); | |
128 | int ret = 0; | |
129 | ||
130 | if (start & 511) | |
131 | return -EINVAL; | |
132 | if (len & 511) | |
133 | return -EINVAL; | |
134 | start >>= 9; | |
135 | len >>= 9; | |
136 | ||
137 | if (start + len > (bdev->bd_inode->i_size >> 9)) | |
138 | return -EINVAL; | |
139 | ||
140 | if (!q->prepare_discard_fn) | |
141 | return -EOPNOTSUPP; | |
142 | ||
143 | while (len && !ret) { | |
144 | DECLARE_COMPLETION_ONSTACK(wait); | |
145 | struct bio *bio; | |
146 | ||
147 | bio = bio_alloc(GFP_KERNEL, 0); | |
148 | if (!bio) | |
149 | return -ENOMEM; | |
150 | ||
151 | bio->bi_end_io = blk_ioc_discard_endio; | |
152 | bio->bi_bdev = bdev; | |
153 | bio->bi_private = &wait; | |
154 | bio->bi_sector = start; | |
155 | ||
156 | if (len > q->max_hw_sectors) { | |
157 | bio->bi_size = q->max_hw_sectors << 9; | |
158 | len -= q->max_hw_sectors; | |
159 | start += q->max_hw_sectors; | |
160 | } else { | |
161 | bio->bi_size = len << 9; | |
162 | len = 0; | |
163 | } | |
164 | submit_bio(WRITE_DISCARD, bio); | |
165 | ||
166 | wait_for_completion(&wait); | |
167 | ||
168 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) | |
169 | ret = -EOPNOTSUPP; | |
170 | else if (!bio_flagged(bio, BIO_UPTODATE)) | |
171 | ret = -EIO; | |
172 | bio_put(bio); | |
173 | } | |
174 | return ret; | |
175 | } | |
176 | ||
1da177e4 LT |
177 | static int put_ushort(unsigned long arg, unsigned short val) |
178 | { | |
179 | return put_user(val, (unsigned short __user *)arg); | |
180 | } | |
181 | ||
182 | static int put_int(unsigned long arg, int val) | |
183 | { | |
184 | return put_user(val, (int __user *)arg); | |
185 | } | |
186 | ||
187 | static int put_long(unsigned long arg, long val) | |
188 | { | |
189 | return put_user(val, (long __user *)arg); | |
190 | } | |
191 | ||
192 | static int put_ulong(unsigned long arg, unsigned long val) | |
193 | { | |
194 | return put_user(val, (unsigned long __user *)arg); | |
195 | } | |
196 | ||
197 | static int put_u64(unsigned long arg, u64 val) | |
198 | { | |
199 | return put_user(val, (u64 __user *)arg); | |
200 | } | |
201 | ||
bb93e3a5 AB |
202 | static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev, |
203 | unsigned cmd, unsigned long arg) | |
1da177e4 | 204 | { |
1da177e4 LT |
205 | struct backing_dev_info *bdi; |
206 | int ret, n; | |
207 | ||
208 | switch (cmd) { | |
209 | case BLKRAGET: | |
210 | case BLKFRAGET: | |
211 | if (!arg) | |
212 | return -EINVAL; | |
213 | bdi = blk_get_backing_dev_info(bdev); | |
214 | if (bdi == NULL) | |
215 | return -ENOTTY; | |
216 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); | |
217 | case BLKROGET: | |
218 | return put_int(arg, bdev_read_only(bdev) != 0); | |
219 | case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */ | |
220 | return put_int(arg, block_size(bdev)); | |
221 | case BLKSSZGET: /* get block device hardware sector size */ | |
222 | return put_int(arg, bdev_hardsect_size(bdev)); | |
223 | case BLKSECTGET: | |
224 | return put_ushort(arg, bdev_get_queue(bdev)->max_sectors); | |
225 | case BLKRASET: | |
226 | case BLKFRASET: | |
227 | if(!capable(CAP_SYS_ADMIN)) | |
228 | return -EACCES; | |
229 | bdi = blk_get_backing_dev_info(bdev); | |
230 | if (bdi == NULL) | |
231 | return -ENOTTY; | |
232 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; | |
233 | return 0; | |
234 | case BLKBSZSET: | |
235 | /* set the logical block size */ | |
236 | if (!capable(CAP_SYS_ADMIN)) | |
237 | return -EACCES; | |
238 | if (!arg) | |
239 | return -EINVAL; | |
240 | if (get_user(n, (int __user *) arg)) | |
241 | return -EFAULT; | |
242 | if (bd_claim(bdev, file) < 0) | |
243 | return -EBUSY; | |
244 | ret = set_blocksize(bdev, n); | |
245 | bd_release(bdev); | |
246 | return ret; | |
247 | case BLKPG: | |
248 | return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); | |
249 | case BLKRRPART: | |
250 | return blkdev_reread_part(bdev); | |
251 | case BLKGETSIZE: | |
252 | if ((bdev->bd_inode->i_size >> 9) > ~0UL) | |
253 | return -EFBIG; | |
254 | return put_ulong(arg, bdev->bd_inode->i_size >> 9); | |
255 | case BLKGETSIZE64: | |
256 | return put_u64(arg, bdev->bd_inode->i_size); | |
2056a782 JA |
257 | case BLKTRACESTART: |
258 | case BLKTRACESTOP: | |
259 | case BLKTRACESETUP: | |
260 | case BLKTRACETEARDOWN: | |
261 | return blk_trace_ioctl(bdev, cmd, (char __user *) arg); | |
bb93e3a5 AB |
262 | } |
263 | return -ENOIOCTLCMD; | |
264 | } | |
265 | ||
7006f6ec AK |
266 | int blkdev_driver_ioctl(struct inode *inode, struct file *file, |
267 | struct gendisk *disk, unsigned cmd, unsigned long arg) | |
bb93e3a5 AB |
268 | { |
269 | int ret; | |
270 | if (disk->fops->unlocked_ioctl) | |
271 | return disk->fops->unlocked_ioctl(file, cmd, arg); | |
272 | ||
273 | if (disk->fops->ioctl) { | |
274 | lock_kernel(); | |
275 | ret = disk->fops->ioctl(inode, file, cmd, arg); | |
276 | unlock_kernel(); | |
277 | return ret; | |
278 | } | |
279 | ||
280 | return -ENOTTY; | |
281 | } | |
7006f6ec | 282 | EXPORT_SYMBOL_GPL(blkdev_driver_ioctl); |
bb93e3a5 | 283 | |
f58c4c0a AB |
284 | /* |
285 | * always keep this in sync with compat_blkdev_ioctl() and | |
286 | * compat_blkdev_locked_ioctl() | |
287 | */ | |
bb93e3a5 AB |
288 | int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd, |
289 | unsigned long arg) | |
290 | { | |
291 | struct block_device *bdev = inode->i_bdev; | |
292 | struct gendisk *disk = bdev->bd_disk; | |
293 | int ret, n; | |
294 | ||
295 | switch(cmd) { | |
1da177e4 LT |
296 | case BLKFLSBUF: |
297 | if (!capable(CAP_SYS_ADMIN)) | |
298 | return -EACCES; | |
bb93e3a5 AB |
299 | |
300 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
301 | /* -EINVAL to handle old uncorrected drivers */ | |
302 | if (ret != -EINVAL && ret != -ENOTTY) | |
303 | return ret; | |
304 | ||
305 | lock_kernel(); | |
1da177e4 | 306 | fsync_bdev(bdev); |
f98393a6 | 307 | invalidate_bdev(bdev); |
bb93e3a5 | 308 | unlock_kernel(); |
1da177e4 | 309 | return 0; |
bb93e3a5 | 310 | |
1da177e4 | 311 | case BLKROSET: |
bb93e3a5 AB |
312 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
313 | /* -EINVAL to handle old uncorrected drivers */ | |
314 | if (ret != -EINVAL && ret != -ENOTTY) | |
315 | return ret; | |
1da177e4 LT |
316 | if (!capable(CAP_SYS_ADMIN)) |
317 | return -EACCES; | |
318 | if (get_user(n, (int __user *)(arg))) | |
319 | return -EFAULT; | |
bb93e3a5 | 320 | lock_kernel(); |
1da177e4 | 321 | set_device_ro(bdev, n); |
bb93e3a5 | 322 | unlock_kernel(); |
1da177e4 | 323 | return 0; |
d30a2605 DW |
324 | |
325 | case BLKDISCARD: { | |
326 | uint64_t range[2]; | |
327 | ||
328 | if (!(file->f_mode & FMODE_WRITE)) | |
329 | return -EBADF; | |
330 | ||
331 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) | |
332 | return -EFAULT; | |
333 | ||
334 | return blk_ioctl_discard(bdev, range[0], range[1]); | |
335 | } | |
336 | ||
a885c8c4 CH |
337 | case HDIO_GETGEO: { |
338 | struct hd_geometry geo; | |
339 | ||
340 | if (!arg) | |
341 | return -EINVAL; | |
342 | if (!disk->fops->getgeo) | |
343 | return -ENOTTY; | |
344 | ||
345 | /* | |
346 | * We need to set the startsect first, the driver may | |
347 | * want to override it. | |
348 | */ | |
349 | geo.start = get_start_sect(bdev); | |
350 | ret = disk->fops->getgeo(bdev, &geo); | |
351 | if (ret) | |
352 | return ret; | |
353 | if (copy_to_user((struct hd_geometry __user *)arg, &geo, | |
354 | sizeof(geo))) | |
355 | return -EFAULT; | |
356 | return 0; | |
357 | } | |
1da177e4 | 358 | } |
bb93e3a5 AB |
359 | |
360 | lock_kernel(); | |
361 | ret = blkdev_locked_ioctl(file, bdev, cmd, arg); | |
362 | unlock_kernel(); | |
363 | if (ret != -ENOIOCTLCMD) | |
364 | return ret; | |
365 | ||
366 | return blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
1da177e4 | 367 | } |
68f66feb | 368 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |