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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 | |
12 | static 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 | /* 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 | } |
47 | |
48 | mutex_lock(&bdev->bd_mutex); |
49 | |
50 | /* overlap? */ |
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 | /* all seems OK */ |
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 | /* all seems OK */ |
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 | |
100 | static 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 | |
116 | static 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 | DISCARD_FL_WAIT); |
130 | } |
131 | |
132 | static int put_ushort(unsigned long arg, unsigned short val) |
133 | { |
134 | return put_user(val, (unsigned short __user *)arg); |
135 | } |
136 | |
137 | static int put_int(unsigned long arg, int val) |
138 | { |
139 | return put_user(val, (int __user *)arg); |
140 | } |
141 | |
142 | static int put_uint(unsigned long arg, unsigned int val) |
143 | { |
144 | return put_user(val, (unsigned int __user *)arg); |
145 | } |
146 | |
147 | static int put_long(unsigned long arg, long val) |
148 | { |
149 | return put_user(val, (long __user *)arg); |
150 | } |
151 | |
152 | static int put_ulong(unsigned long arg, unsigned long val) |
153 | { |
154 | return put_user(val, (unsigned long __user *)arg); |
155 | } |
156 | |
157 | static int put_u64(unsigned long arg, u64 val) |
158 | { |
159 | return put_user(val, (u64 __user *)arg); |
160 | } |
161 | |
162 | int __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 | * 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 | */ |
185 | EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); |
186 | |
187 | /* |
188 | * always keep this in sync with compat_blkdev_ioctl() and |
189 | * compat_blkdev_locked_ioctl() |
190 | */ |
191 | int 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 | /* -EINVAL to handle old uncorrected drivers */ |
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 | /* -EINVAL to handle old uncorrected drivers */ |
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 | * We need to set the startsect first, the driver may |
251 | * want to override it. |
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: /* get block device soft block size (cf. BLKSSZGET) */ |
273 | return put_int(arg, block_size(bdev)); |
274 | case BLKSSZGET: /* get block device logical block size */ |
275 | return put_int(arg, bdev_logical_block_size(bdev)); |
276 | case BLKPBSZGET: /* get block device physical block size */ |
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 | /* set the logical block size */ |
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 | } |
341 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |
342 |
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