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Commit | Line | Data |
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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 | ||
114 | static int put_ushort(unsigned long arg, unsigned short val) | |
115 | { | |
116 | return put_user(val, (unsigned short __user *)arg); | |
117 | } | |
118 | ||
119 | static int put_int(unsigned long arg, int val) | |
120 | { | |
121 | return put_user(val, (int __user *)arg); | |
122 | } | |
123 | ||
124 | static int put_long(unsigned long arg, long val) | |
125 | { | |
126 | return put_user(val, (long __user *)arg); | |
127 | } | |
128 | ||
129 | static int put_ulong(unsigned long arg, unsigned long val) | |
130 | { | |
131 | return put_user(val, (unsigned long __user *)arg); | |
132 | } | |
133 | ||
134 | static int put_u64(unsigned long arg, u64 val) | |
135 | { | |
136 | return put_user(val, (u64 __user *)arg); | |
137 | } | |
138 | ||
bb93e3a5 AB |
139 | static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev, |
140 | unsigned cmd, unsigned long arg) | |
1da177e4 | 141 | { |
1da177e4 LT |
142 | struct backing_dev_info *bdi; |
143 | int ret, n; | |
144 | ||
145 | switch (cmd) { | |
146 | case BLKRAGET: | |
147 | case BLKFRAGET: | |
148 | if (!arg) | |
149 | return -EINVAL; | |
150 | bdi = blk_get_backing_dev_info(bdev); | |
151 | if (bdi == NULL) | |
152 | return -ENOTTY; | |
153 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); | |
154 | case BLKROGET: | |
155 | return put_int(arg, bdev_read_only(bdev) != 0); | |
156 | case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */ | |
157 | return put_int(arg, block_size(bdev)); | |
158 | case BLKSSZGET: /* get block device hardware sector size */ | |
159 | return put_int(arg, bdev_hardsect_size(bdev)); | |
160 | case BLKSECTGET: | |
161 | return put_ushort(arg, bdev_get_queue(bdev)->max_sectors); | |
162 | case BLKRASET: | |
163 | case BLKFRASET: | |
164 | if(!capable(CAP_SYS_ADMIN)) | |
165 | return -EACCES; | |
166 | bdi = blk_get_backing_dev_info(bdev); | |
167 | if (bdi == NULL) | |
168 | return -ENOTTY; | |
169 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; | |
170 | return 0; | |
171 | case BLKBSZSET: | |
172 | /* set the logical block size */ | |
173 | if (!capable(CAP_SYS_ADMIN)) | |
174 | return -EACCES; | |
175 | if (!arg) | |
176 | return -EINVAL; | |
177 | if (get_user(n, (int __user *) arg)) | |
178 | return -EFAULT; | |
179 | if (bd_claim(bdev, file) < 0) | |
180 | return -EBUSY; | |
181 | ret = set_blocksize(bdev, n); | |
182 | bd_release(bdev); | |
183 | return ret; | |
184 | case BLKPG: | |
185 | return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); | |
186 | case BLKRRPART: | |
187 | return blkdev_reread_part(bdev); | |
188 | case BLKGETSIZE: | |
189 | if ((bdev->bd_inode->i_size >> 9) > ~0UL) | |
190 | return -EFBIG; | |
191 | return put_ulong(arg, bdev->bd_inode->i_size >> 9); | |
192 | case BLKGETSIZE64: | |
193 | return put_u64(arg, bdev->bd_inode->i_size); | |
2056a782 JA |
194 | case BLKTRACESTART: |
195 | case BLKTRACESTOP: | |
196 | case BLKTRACESETUP: | |
197 | case BLKTRACETEARDOWN: | |
198 | return blk_trace_ioctl(bdev, cmd, (char __user *) arg); | |
bb93e3a5 AB |
199 | } |
200 | return -ENOIOCTLCMD; | |
201 | } | |
202 | ||
7006f6ec AK |
203 | int blkdev_driver_ioctl(struct inode *inode, struct file *file, |
204 | struct gendisk *disk, unsigned cmd, unsigned long arg) | |
bb93e3a5 AB |
205 | { |
206 | int ret; | |
207 | if (disk->fops->unlocked_ioctl) | |
208 | return disk->fops->unlocked_ioctl(file, cmd, arg); | |
209 | ||
210 | if (disk->fops->ioctl) { | |
211 | lock_kernel(); | |
212 | ret = disk->fops->ioctl(inode, file, cmd, arg); | |
213 | unlock_kernel(); | |
214 | return ret; | |
215 | } | |
216 | ||
217 | return -ENOTTY; | |
218 | } | |
7006f6ec | 219 | EXPORT_SYMBOL_GPL(blkdev_driver_ioctl); |
bb93e3a5 | 220 | |
f58c4c0a AB |
221 | /* |
222 | * always keep this in sync with compat_blkdev_ioctl() and | |
223 | * compat_blkdev_locked_ioctl() | |
224 | */ | |
bb93e3a5 AB |
225 | int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd, |
226 | unsigned long arg) | |
227 | { | |
228 | struct block_device *bdev = inode->i_bdev; | |
229 | struct gendisk *disk = bdev->bd_disk; | |
230 | int ret, n; | |
231 | ||
232 | switch(cmd) { | |
1da177e4 LT |
233 | case BLKFLSBUF: |
234 | if (!capable(CAP_SYS_ADMIN)) | |
235 | return -EACCES; | |
bb93e3a5 AB |
236 | |
237 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
238 | /* -EINVAL to handle old uncorrected drivers */ | |
239 | if (ret != -EINVAL && ret != -ENOTTY) | |
240 | return ret; | |
241 | ||
242 | lock_kernel(); | |
1da177e4 | 243 | fsync_bdev(bdev); |
f98393a6 | 244 | invalidate_bdev(bdev); |
bb93e3a5 | 245 | unlock_kernel(); |
1da177e4 | 246 | return 0; |
bb93e3a5 | 247 | |
1da177e4 | 248 | case BLKROSET: |
bb93e3a5 AB |
249 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
250 | /* -EINVAL to handle old uncorrected drivers */ | |
251 | if (ret != -EINVAL && ret != -ENOTTY) | |
252 | return ret; | |
1da177e4 LT |
253 | if (!capable(CAP_SYS_ADMIN)) |
254 | return -EACCES; | |
255 | if (get_user(n, (int __user *)(arg))) | |
256 | return -EFAULT; | |
bb93e3a5 | 257 | lock_kernel(); |
1da177e4 | 258 | set_device_ro(bdev, n); |
bb93e3a5 | 259 | unlock_kernel(); |
1da177e4 | 260 | return 0; |
a885c8c4 CH |
261 | case HDIO_GETGEO: { |
262 | struct hd_geometry geo; | |
263 | ||
264 | if (!arg) | |
265 | return -EINVAL; | |
266 | if (!disk->fops->getgeo) | |
267 | return -ENOTTY; | |
268 | ||
269 | /* | |
270 | * We need to set the startsect first, the driver may | |
271 | * want to override it. | |
272 | */ | |
273 | geo.start = get_start_sect(bdev); | |
274 | ret = disk->fops->getgeo(bdev, &geo); | |
275 | if (ret) | |
276 | return ret; | |
277 | if (copy_to_user((struct hd_geometry __user *)arg, &geo, | |
278 | sizeof(geo))) | |
279 | return -EFAULT; | |
280 | return 0; | |
281 | } | |
1da177e4 | 282 | } |
bb93e3a5 AB |
283 | |
284 | lock_kernel(); | |
285 | ret = blkdev_locked_ioctl(file, bdev, cmd, arg); | |
286 | unlock_kernel(); | |
287 | if (ret != -ENOIOCTLCMD) | |
288 | return ret; | |
289 | ||
290 | return blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
1da177e4 | 291 | } |
68f66feb | 292 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |