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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, int secure) | |
118 | { | |
119 | unsigned long flags = BLKDEV_IFL_WAIT; | |
120 | ||
121 | if (start & 511) | |
122 | return -EINVAL; | |
123 | if (len & 511) | |
124 | return -EINVAL; | |
125 | start >>= 9; | |
126 | len >>= 9; | |
127 | ||
128 | if (start + len > (bdev->bd_inode->i_size >> 9)) | |
129 | return -EINVAL; | |
130 | if (secure) | |
131 | flags |= BLKDEV_IFL_SECURE; | |
132 | return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags); | |
133 | } | |
134 | ||
135 | static int put_ushort(unsigned long arg, unsigned short val) | |
136 | { | |
137 | return put_user(val, (unsigned short __user *)arg); | |
138 | } | |
139 | ||
140 | static int put_int(unsigned long arg, int val) | |
141 | { | |
142 | return put_user(val, (int __user *)arg); | |
143 | } | |
144 | ||
145 | static int put_uint(unsigned long arg, unsigned int val) | |
146 | { | |
147 | return put_user(val, (unsigned int __user *)arg); | |
148 | } | |
149 | ||
150 | static int put_long(unsigned long arg, long val) | |
151 | { | |
152 | return put_user(val, (long __user *)arg); | |
153 | } | |
154 | ||
155 | static int put_ulong(unsigned long arg, unsigned long val) | |
156 | { | |
157 | return put_user(val, (unsigned long __user *)arg); | |
158 | } | |
159 | ||
160 | static int put_u64(unsigned long arg, u64 val) | |
161 | { | |
162 | return put_user(val, (u64 __user *)arg); | |
163 | } | |
164 | ||
165 | int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, | |
166 | unsigned cmd, unsigned long arg) | |
167 | { | |
168 | struct gendisk *disk = bdev->bd_disk; | |
169 | ||
170 | if (disk->fops->ioctl) | |
171 | return disk->fops->ioctl(bdev, mode, cmd, arg); | |
172 | ||
173 | return -ENOTTY; | |
174 | } | |
175 | /* | |
176 | * For the record: _GPL here is only because somebody decided to slap it | |
177 | * on the previous export. Sheer idiocy, since it wasn't copyrightable | |
178 | * at all and could be open-coded without any exports by anybody who cares. | |
179 | */ | |
180 | EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); | |
181 | ||
182 | /* | |
183 | * always keep this in sync with compat_blkdev_ioctl() | |
184 | */ | |
185 | int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, | |
186 | unsigned long arg) | |
187 | { | |
188 | struct gendisk *disk = bdev->bd_disk; | |
189 | struct backing_dev_info *bdi; | |
190 | loff_t size; | |
191 | int ret, n; | |
192 | ||
193 | switch(cmd) { | |
194 | case BLKFLSBUF: | |
195 | if (!capable(CAP_SYS_ADMIN)) | |
196 | return -EACCES; | |
197 | ||
198 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
199 | /* -EINVAL to handle old uncorrected drivers */ | |
200 | if (ret != -EINVAL && ret != -ENOTTY) | |
201 | return ret; | |
202 | ||
203 | fsync_bdev(bdev); | |
204 | invalidate_bdev(bdev); | |
205 | return 0; | |
206 | ||
207 | case BLKROSET: | |
208 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
209 | /* -EINVAL to handle old uncorrected drivers */ | |
210 | if (ret != -EINVAL && ret != -ENOTTY) | |
211 | return ret; | |
212 | if (!capable(CAP_SYS_ADMIN)) | |
213 | return -EACCES; | |
214 | if (get_user(n, (int __user *)(arg))) | |
215 | return -EFAULT; | |
216 | set_device_ro(bdev, n); | |
217 | return 0; | |
218 | ||
219 | case BLKDISCARD: | |
220 | case BLKSECDISCARD: { | |
221 | uint64_t range[2]; | |
222 | ||
223 | if (!(mode & FMODE_WRITE)) | |
224 | return -EBADF; | |
225 | ||
226 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) | |
227 | return -EFAULT; | |
228 | ||
229 | return blk_ioctl_discard(bdev, range[0], range[1], | |
230 | cmd == BLKSECDISCARD); | |
231 | } | |
232 | ||
233 | case HDIO_GETGEO: { | |
234 | struct hd_geometry geo; | |
235 | ||
236 | if (!arg) | |
237 | return -EINVAL; | |
238 | if (!disk->fops->getgeo) | |
239 | return -ENOTTY; | |
240 | ||
241 | /* | |
242 | * We need to set the startsect first, the driver may | |
243 | * want to override it. | |
244 | */ | |
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) && bd_claim(bdev, &bdev) < 0) | |
298 | return -EBUSY; | |
299 | ret = set_blocksize(bdev, n); | |
300 | if (!(mode & FMODE_EXCL)) | |
301 | bd_release(bdev); | |
302 | return ret; | |
303 | case BLKPG: | |
304 | ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); | |
305 | break; | |
306 | case BLKRRPART: | |
307 | ret = blkdev_reread_part(bdev); | |
308 | break; | |
309 | case BLKGETSIZE: | |
310 | size = bdev->bd_inode->i_size; | |
311 | if ((size >> 9) > ~0UL) | |
312 | return -EFBIG; | |
313 | return put_ulong(arg, size >> 9); | |
314 | case BLKGETSIZE64: | |
315 | return put_u64(arg, bdev->bd_inode->i_size); | |
316 | case BLKTRACESTART: | |
317 | case BLKTRACESTOP: | |
318 | case BLKTRACESETUP: | |
319 | case BLKTRACETEARDOWN: | |
320 | ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg); | |
321 | break; | |
322 | default: | |
323 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
324 | } | |
325 | return ret; | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |