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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/blktrace_api.h> |
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 hd_struct *part; |
16 | struct blkpg_ioctl_arg a; |
17 | struct blkpg_partition p; |
18 | struct disk_part_iter piter; |
19 | long long start, length; |
20 | int partno; |
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 | partno = p.pno; |
32 | if (partno <= 0) |
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 | |
47 | mutex_lock(&bdev->bd_mutex); |
48 | |
49 | /* overlap? */ |
50 | disk_part_iter_init(&piter, disk, |
51 | DISK_PITER_INCL_EMPTY); |
52 | while ((part = disk_part_iter_next(&piter))) { |
53 | if (!(start + length <= part->start_sect || |
54 | start >= part->start_sect + part->nr_sects)) { |
55 | disk_part_iter_exit(&piter); |
56 | mutex_unlock(&bdev->bd_mutex); |
57 | return -EBUSY; |
58 | } |
59 | } |
60 | disk_part_iter_exit(&piter); |
61 | |
62 | /* all seems OK */ |
63 | part = add_partition(disk, partno, start, length, |
64 | ADDPART_FLAG_NONE, NULL); |
65 | mutex_unlock(&bdev->bd_mutex); |
66 | return IS_ERR(part) ? PTR_ERR(part) : 0; |
67 | case BLKPG_DEL_PARTITION: |
68 | part = disk_get_part(disk, partno); |
69 | if (!part) |
70 | return -ENXIO; |
71 | |
72 | bdevp = bdget(part_devt(part)); |
73 | disk_put_part(part); |
74 | if (!bdevp) |
75 | return -ENOMEM; |
76 | |
77 | mutex_lock(&bdevp->bd_mutex); |
78 | if (bdevp->bd_openers) { |
79 | mutex_unlock(&bdevp->bd_mutex); |
80 | bdput(bdevp); |
81 | return -EBUSY; |
82 | } |
83 | /* all seems OK */ |
84 | fsync_bdev(bdevp); |
85 | invalidate_bdev(bdevp); |
86 | |
87 | mutex_lock_nested(&bdev->bd_mutex, 1); |
88 | delete_partition(disk, partno); |
89 | mutex_unlock(&bdev->bd_mutex); |
90 | mutex_unlock(&bdevp->bd_mutex); |
91 | bdput(bdevp); |
92 | |
93 | return 0; |
94 | default: |
95 | return -EINVAL; |
96 | } |
97 | } |
98 | |
99 | static int blkdev_reread_part(struct block_device *bdev) |
100 | { |
101 | struct gendisk *disk = bdev->bd_disk; |
102 | int res; |
103 | |
104 | if (!disk_partitionable(disk) || bdev != bdev->bd_contains) |
105 | return -EINVAL; |
106 | if (!capable(CAP_SYS_ADMIN)) |
107 | return -EACCES; |
108 | if (!mutex_trylock(&bdev->bd_mutex)) |
109 | return -EBUSY; |
110 | res = rescan_partitions(disk, bdev); |
111 | mutex_unlock(&bdev->bd_mutex); |
112 | return res; |
113 | } |
114 | |
115 | static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, |
116 | uint64_t len, int secure) |
117 | { |
118 | unsigned long flags = 0; |
119 | |
120 | if (start & 511) |
121 | return -EINVAL; |
122 | if (len & 511) |
123 | return -EINVAL; |
124 | start >>= 9; |
125 | len >>= 9; |
126 | |
127 | if (start + len > (i_size_read(bdev->bd_inode) >> 9)) |
128 | return -EINVAL; |
129 | if (secure) |
130 | flags |= BLKDEV_DISCARD_SECURE; |
131 | return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags); |
132 | } |
133 | |
134 | static int put_ushort(unsigned long arg, unsigned short val) |
135 | { |
136 | return put_user(val, (unsigned short __user *)arg); |
137 | } |
138 | |
139 | static int put_int(unsigned long arg, int val) |
140 | { |
141 | return put_user(val, (int __user *)arg); |
142 | } |
143 | |
144 | static int put_uint(unsigned long arg, unsigned int val) |
145 | { |
146 | return put_user(val, (unsigned int __user *)arg); |
147 | } |
148 | |
149 | static int put_long(unsigned long arg, long val) |
150 | { |
151 | return put_user(val, (long __user *)arg); |
152 | } |
153 | |
154 | static int put_ulong(unsigned long arg, unsigned long val) |
155 | { |
156 | return put_user(val, (unsigned long __user *)arg); |
157 | } |
158 | |
159 | static int put_u64(unsigned long arg, u64 val) |
160 | { |
161 | return put_user(val, (u64 __user *)arg); |
162 | } |
163 | |
164 | int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
165 | unsigned cmd, unsigned long arg) |
166 | { |
167 | struct gendisk *disk = bdev->bd_disk; |
168 | |
169 | if (disk->fops->ioctl) |
170 | return disk->fops->ioctl(bdev, mode, cmd, arg); |
171 | |
172 | return -ENOTTY; |
173 | } |
174 | /* |
175 | * For the record: _GPL here is only because somebody decided to slap it |
176 | * on the previous export. Sheer idiocy, since it wasn't copyrightable |
177 | * at all and could be open-coded without any exports by anybody who cares. |
178 | */ |
179 | EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); |
180 | |
181 | /* |
182 | * always keep this in sync with compat_blkdev_ioctl() |
183 | */ |
184 | int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
185 | unsigned long arg) |
186 | { |
187 | struct gendisk *disk = bdev->bd_disk; |
188 | struct backing_dev_info *bdi; |
189 | loff_t size; |
190 | int ret, n; |
191 | |
192 | switch(cmd) { |
193 | case BLKFLSBUF: |
194 | if (!capable(CAP_SYS_ADMIN)) |
195 | return -EACCES; |
196 | |
197 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
198 | /* -EINVAL to handle old uncorrected drivers */ |
199 | if (ret != -EINVAL && ret != -ENOTTY) |
200 | return ret; |
201 | |
202 | fsync_bdev(bdev); |
203 | invalidate_bdev(bdev); |
204 | return 0; |
205 | |
206 | case BLKROSET: |
207 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
208 | /* -EINVAL to handle old uncorrected drivers */ |
209 | if (ret != -EINVAL && ret != -ENOTTY) |
210 | return ret; |
211 | if (!capable(CAP_SYS_ADMIN)) |
212 | return -EACCES; |
213 | if (get_user(n, (int __user *)(arg))) |
214 | return -EFAULT; |
215 | set_device_ro(bdev, n); |
216 | return 0; |
217 | |
218 | case BLKDISCARD: |
219 | case BLKSECDISCARD: { |
220 | uint64_t range[2]; |
221 | |
222 | if (!(mode & FMODE_WRITE)) |
223 | return -EBADF; |
224 | |
225 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
226 | return -EFAULT; |
227 | |
228 | return blk_ioctl_discard(bdev, range[0], range[1], |
229 | cmd == BLKSECDISCARD); |
230 | } |
231 | |
232 | case HDIO_GETGEO: { |
233 | struct hd_geometry geo; |
234 | |
235 | if (!arg) |
236 | return -EINVAL; |
237 | if (!disk->fops->getgeo) |
238 | return -ENOTTY; |
239 | |
240 | /* |
241 | * We need to set the startsect first, the driver may |
242 | * want to override it. |
243 | */ |
244 | memset(&geo, 0, sizeof(geo)); |
245 | geo.start = get_start_sect(bdev); |
246 | ret = disk->fops->getgeo(bdev, &geo); |
247 | if (ret) |
248 | return ret; |
249 | if (copy_to_user((struct hd_geometry __user *)arg, &geo, |
250 | sizeof(geo))) |
251 | return -EFAULT; |
252 | return 0; |
253 | } |
254 | case BLKRAGET: |
255 | case BLKFRAGET: |
256 | if (!arg) |
257 | return -EINVAL; |
258 | bdi = blk_get_backing_dev_info(bdev); |
259 | if (bdi == NULL) |
260 | return -ENOTTY; |
261 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); |
262 | case BLKROGET: |
263 | return put_int(arg, bdev_read_only(bdev) != 0); |
264 | case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ |
265 | return put_int(arg, block_size(bdev)); |
266 | case BLKSSZGET: /* get block device logical block size */ |
267 | return put_int(arg, bdev_logical_block_size(bdev)); |
268 | case BLKPBSZGET: /* get block device physical block size */ |
269 | return put_uint(arg, bdev_physical_block_size(bdev)); |
270 | case BLKIOMIN: |
271 | return put_uint(arg, bdev_io_min(bdev)); |
272 | case BLKIOOPT: |
273 | return put_uint(arg, bdev_io_opt(bdev)); |
274 | case BLKALIGNOFF: |
275 | return put_int(arg, bdev_alignment_offset(bdev)); |
276 | case BLKDISCARDZEROES: |
277 | return put_uint(arg, bdev_discard_zeroes_data(bdev)); |
278 | case BLKSECTGET: |
279 | return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev))); |
280 | case BLKRASET: |
281 | case BLKFRASET: |
282 | if(!capable(CAP_SYS_ADMIN)) |
283 | return -EACCES; |
284 | bdi = blk_get_backing_dev_info(bdev); |
285 | if (bdi == NULL) |
286 | return -ENOTTY; |
287 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; |
288 | return 0; |
289 | case BLKBSZSET: |
290 | /* set the logical block size */ |
291 | if (!capable(CAP_SYS_ADMIN)) |
292 | return -EACCES; |
293 | if (!arg) |
294 | return -EINVAL; |
295 | if (get_user(n, (int __user *) arg)) |
296 | return -EFAULT; |
297 | if (!(mode & FMODE_EXCL)) { |
298 | bdgrab(bdev); |
299 | if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) |
300 | return -EBUSY; |
301 | } |
302 | ret = set_blocksize(bdev, n); |
303 | if (!(mode & FMODE_EXCL)) |
304 | blkdev_put(bdev, mode | FMODE_EXCL); |
305 | return ret; |
306 | case BLKPG: |
307 | ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); |
308 | break; |
309 | case BLKRRPART: |
310 | ret = blkdev_reread_part(bdev); |
311 | break; |
312 | case BLKGETSIZE: |
313 | size = i_size_read(bdev->bd_inode); |
314 | if ((size >> 9) > ~0UL) |
315 | return -EFBIG; |
316 | return put_ulong(arg, size >> 9); |
317 | case BLKGETSIZE64: |
318 | return put_u64(arg, i_size_read(bdev->bd_inode)); |
319 | case BLKTRACESTART: |
320 | case BLKTRACESTOP: |
321 | case BLKTRACESETUP: |
322 | case BLKTRACETEARDOWN: |
323 | ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg); |
324 | break; |
325 | default: |
326 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
327 | } |
328 | return ret; |
329 | } |
330 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |
331 |
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