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; | |
1da177e4 LT |
71 | bdevp = bdget_disk(disk, part); |
72 | if (!bdevp) | |
73 | return -ENOMEM; | |
2e7b651d | 74 | mutex_lock(&bdevp->bd_mutex); |
1da177e4 | 75 | if (bdevp->bd_openers) { |
c039e313 | 76 | mutex_unlock(&bdevp->bd_mutex); |
1da177e4 LT |
77 | bdput(bdevp); |
78 | return -EBUSY; | |
79 | } | |
80 | /* all seems OK */ | |
81 | fsync_bdev(bdevp); | |
f98393a6 | 82 | invalidate_bdev(bdevp); |
1da177e4 | 83 | |
6d740cd5 | 84 | mutex_lock_nested(&bdev->bd_mutex, 1); |
1da177e4 | 85 | delete_partition(disk, part); |
c039e313 AV |
86 | mutex_unlock(&bdev->bd_mutex); |
87 | mutex_unlock(&bdevp->bd_mutex); | |
1da177e4 LT |
88 | bdput(bdevp); |
89 | ||
90 | return 0; | |
91 | default: | |
92 | return -EINVAL; | |
93 | } | |
94 | } | |
95 | ||
96 | static int blkdev_reread_part(struct block_device *bdev) | |
97 | { | |
98 | struct gendisk *disk = bdev->bd_disk; | |
99 | int res; | |
100 | ||
101 | if (disk->minors == 1 || bdev != bdev->bd_contains) | |
102 | return -EINVAL; | |
103 | if (!capable(CAP_SYS_ADMIN)) | |
104 | return -EACCES; | |
c039e313 | 105 | if (!mutex_trylock(&bdev->bd_mutex)) |
1da177e4 LT |
106 | return -EBUSY; |
107 | res = rescan_partitions(disk, bdev); | |
c039e313 | 108 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
109 | return res; |
110 | } | |
111 | ||
d30a2605 DW |
112 | static void blk_ioc_discard_endio(struct bio *bio, int err) |
113 | { | |
114 | if (err) { | |
115 | if (err == -EOPNOTSUPP) | |
116 | set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); | |
117 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
118 | } | |
119 | complete(bio->bi_private); | |
120 | } | |
121 | ||
122 | static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, | |
123 | uint64_t len) | |
124 | { | |
125 | struct request_queue *q = bdev_get_queue(bdev); | |
126 | int ret = 0; | |
127 | ||
128 | if (start & 511) | |
129 | return -EINVAL; | |
130 | if (len & 511) | |
131 | return -EINVAL; | |
132 | start >>= 9; | |
133 | len >>= 9; | |
134 | ||
135 | if (start + len > (bdev->bd_inode->i_size >> 9)) | |
136 | return -EINVAL; | |
137 | ||
138 | if (!q->prepare_discard_fn) | |
139 | return -EOPNOTSUPP; | |
140 | ||
141 | while (len && !ret) { | |
142 | DECLARE_COMPLETION_ONSTACK(wait); | |
143 | struct bio *bio; | |
144 | ||
145 | bio = bio_alloc(GFP_KERNEL, 0); | |
146 | if (!bio) | |
147 | return -ENOMEM; | |
148 | ||
149 | bio->bi_end_io = blk_ioc_discard_endio; | |
150 | bio->bi_bdev = bdev; | |
151 | bio->bi_private = &wait; | |
152 | bio->bi_sector = start; | |
153 | ||
154 | if (len > q->max_hw_sectors) { | |
155 | bio->bi_size = q->max_hw_sectors << 9; | |
156 | len -= q->max_hw_sectors; | |
157 | start += q->max_hw_sectors; | |
158 | } else { | |
159 | bio->bi_size = len << 9; | |
160 | len = 0; | |
161 | } | |
e17fc0a1 | 162 | submit_bio(DISCARD_NOBARRIER, bio); |
d30a2605 DW |
163 | |
164 | wait_for_completion(&wait); | |
165 | ||
166 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) | |
167 | ret = -EOPNOTSUPP; | |
168 | else if (!bio_flagged(bio, BIO_UPTODATE)) | |
169 | ret = -EIO; | |
170 | bio_put(bio); | |
171 | } | |
172 | return ret; | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static int put_ushort(unsigned long arg, unsigned short val) |
176 | { | |
177 | return put_user(val, (unsigned short __user *)arg); | |
178 | } | |
179 | ||
180 | static int put_int(unsigned long arg, int val) | |
181 | { | |
182 | return put_user(val, (int __user *)arg); | |
183 | } | |
184 | ||
185 | static int put_long(unsigned long arg, long val) | |
186 | { | |
187 | return put_user(val, (long __user *)arg); | |
188 | } | |
189 | ||
190 | static int put_ulong(unsigned long arg, unsigned long val) | |
191 | { | |
192 | return put_user(val, (unsigned long __user *)arg); | |
193 | } | |
194 | ||
195 | static int put_u64(unsigned long arg, u64 val) | |
196 | { | |
197 | return put_user(val, (u64 __user *)arg); | |
198 | } | |
199 | ||
bb93e3a5 AB |
200 | static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev, |
201 | unsigned cmd, unsigned long arg) | |
1da177e4 | 202 | { |
1da177e4 LT |
203 | struct backing_dev_info *bdi; |
204 | int ret, n; | |
205 | ||
206 | switch (cmd) { | |
207 | case BLKRAGET: | |
208 | case BLKFRAGET: | |
209 | if (!arg) | |
210 | return -EINVAL; | |
211 | bdi = blk_get_backing_dev_info(bdev); | |
212 | if (bdi == NULL) | |
213 | return -ENOTTY; | |
214 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); | |
215 | case BLKROGET: | |
216 | return put_int(arg, bdev_read_only(bdev) != 0); | |
217 | case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */ | |
218 | return put_int(arg, block_size(bdev)); | |
219 | case BLKSSZGET: /* get block device hardware sector size */ | |
220 | return put_int(arg, bdev_hardsect_size(bdev)); | |
221 | case BLKSECTGET: | |
222 | return put_ushort(arg, bdev_get_queue(bdev)->max_sectors); | |
223 | case BLKRASET: | |
224 | case BLKFRASET: | |
225 | if(!capable(CAP_SYS_ADMIN)) | |
226 | return -EACCES; | |
227 | bdi = blk_get_backing_dev_info(bdev); | |
228 | if (bdi == NULL) | |
229 | return -ENOTTY; | |
230 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; | |
231 | return 0; | |
232 | case BLKBSZSET: | |
233 | /* set the logical block size */ | |
234 | if (!capable(CAP_SYS_ADMIN)) | |
235 | return -EACCES; | |
236 | if (!arg) | |
237 | return -EINVAL; | |
238 | if (get_user(n, (int __user *) arg)) | |
239 | return -EFAULT; | |
240 | if (bd_claim(bdev, file) < 0) | |
241 | return -EBUSY; | |
242 | ret = set_blocksize(bdev, n); | |
243 | bd_release(bdev); | |
244 | return ret; | |
245 | case BLKPG: | |
246 | return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); | |
247 | case BLKRRPART: | |
248 | return blkdev_reread_part(bdev); | |
249 | case BLKGETSIZE: | |
250 | if ((bdev->bd_inode->i_size >> 9) > ~0UL) | |
251 | return -EFBIG; | |
252 | return put_ulong(arg, bdev->bd_inode->i_size >> 9); | |
253 | case BLKGETSIZE64: | |
254 | return put_u64(arg, bdev->bd_inode->i_size); | |
2056a782 JA |
255 | case BLKTRACESTART: |
256 | case BLKTRACESTOP: | |
257 | case BLKTRACESETUP: | |
258 | case BLKTRACETEARDOWN: | |
259 | return blk_trace_ioctl(bdev, cmd, (char __user *) arg); | |
bb93e3a5 AB |
260 | } |
261 | return -ENOIOCTLCMD; | |
262 | } | |
263 | ||
7006f6ec AK |
264 | int blkdev_driver_ioctl(struct inode *inode, struct file *file, |
265 | struct gendisk *disk, unsigned cmd, unsigned long arg) | |
bb93e3a5 AB |
266 | { |
267 | int ret; | |
268 | if (disk->fops->unlocked_ioctl) | |
269 | return disk->fops->unlocked_ioctl(file, cmd, arg); | |
270 | ||
271 | if (disk->fops->ioctl) { | |
272 | lock_kernel(); | |
273 | ret = disk->fops->ioctl(inode, file, cmd, arg); | |
274 | unlock_kernel(); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | return -ENOTTY; | |
279 | } | |
7006f6ec | 280 | EXPORT_SYMBOL_GPL(blkdev_driver_ioctl); |
bb93e3a5 | 281 | |
f58c4c0a AB |
282 | /* |
283 | * always keep this in sync with compat_blkdev_ioctl() and | |
284 | * compat_blkdev_locked_ioctl() | |
285 | */ | |
bb93e3a5 AB |
286 | int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd, |
287 | unsigned long arg) | |
288 | { | |
289 | struct block_device *bdev = inode->i_bdev; | |
290 | struct gendisk *disk = bdev->bd_disk; | |
291 | int ret, n; | |
292 | ||
293 | switch(cmd) { | |
1da177e4 LT |
294 | case BLKFLSBUF: |
295 | if (!capable(CAP_SYS_ADMIN)) | |
296 | return -EACCES; | |
bb93e3a5 AB |
297 | |
298 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
299 | /* -EINVAL to handle old uncorrected drivers */ | |
300 | if (ret != -EINVAL && ret != -ENOTTY) | |
301 | return ret; | |
302 | ||
303 | lock_kernel(); | |
1da177e4 | 304 | fsync_bdev(bdev); |
f98393a6 | 305 | invalidate_bdev(bdev); |
bb93e3a5 | 306 | unlock_kernel(); |
1da177e4 | 307 | return 0; |
bb93e3a5 | 308 | |
1da177e4 | 309 | case BLKROSET: |
bb93e3a5 AB |
310 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
311 | /* -EINVAL to handle old uncorrected drivers */ | |
312 | if (ret != -EINVAL && ret != -ENOTTY) | |
313 | return ret; | |
1da177e4 LT |
314 | if (!capable(CAP_SYS_ADMIN)) |
315 | return -EACCES; | |
316 | if (get_user(n, (int __user *)(arg))) | |
317 | return -EFAULT; | |
bb93e3a5 | 318 | lock_kernel(); |
1da177e4 | 319 | set_device_ro(bdev, n); |
bb93e3a5 | 320 | unlock_kernel(); |
1da177e4 | 321 | return 0; |
d30a2605 DW |
322 | |
323 | case BLKDISCARD: { | |
324 | uint64_t range[2]; | |
325 | ||
326 | if (!(file->f_mode & FMODE_WRITE)) | |
327 | return -EBADF; | |
328 | ||
329 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) | |
330 | return -EFAULT; | |
331 | ||
332 | return blk_ioctl_discard(bdev, range[0], range[1]); | |
333 | } | |
334 | ||
a885c8c4 CH |
335 | case HDIO_GETGEO: { |
336 | struct hd_geometry geo; | |
337 | ||
338 | if (!arg) | |
339 | return -EINVAL; | |
340 | if (!disk->fops->getgeo) | |
341 | return -ENOTTY; | |
342 | ||
343 | /* | |
344 | * We need to set the startsect first, the driver may | |
345 | * want to override it. | |
346 | */ | |
347 | geo.start = get_start_sect(bdev); | |
348 | ret = disk->fops->getgeo(bdev, &geo); | |
349 | if (ret) | |
350 | return ret; | |
351 | if (copy_to_user((struct hd_geometry __user *)arg, &geo, | |
352 | sizeof(geo))) | |
353 | return -EFAULT; | |
354 | return 0; | |
355 | } | |
1da177e4 | 356 | } |
bb93e3a5 AB |
357 | |
358 | lock_kernel(); | |
359 | ret = blkdev_locked_ioctl(file, bdev, cmd, arg); | |
360 | unlock_kernel(); | |
361 | if (ret != -ENOIOCTLCMD) | |
362 | return ret; | |
363 | ||
364 | return blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
1da177e4 | 365 | } |
68f66feb | 366 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |