Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/sched.h> /* for capable() */ |
2 | #include <linux/blkdev.h> | |
3 | #include <linux/blkpg.h> | |
4 | #include <linux/backing-dev.h> | |
5 | #include <linux/buffer_head.h> | |
6 | #include <linux/smp_lock.h> | |
7 | #include <asm/uaccess.h> | |
8 | ||
9 | static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) | |
10 | { | |
11 | struct block_device *bdevp; | |
12 | struct gendisk *disk; | |
13 | struct blkpg_ioctl_arg a; | |
14 | struct blkpg_partition p; | |
15 | long long start, length; | |
16 | int part; | |
17 | int i; | |
18 | ||
19 | if (!capable(CAP_SYS_ADMIN)) | |
20 | return -EACCES; | |
21 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) | |
22 | return -EFAULT; | |
23 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
24 | return -EFAULT; | |
25 | disk = bdev->bd_disk; | |
26 | if (bdev != bdev->bd_contains) | |
27 | return -EINVAL; | |
28 | part = p.pno; | |
29 | if (part <= 0 || part >= disk->minors) | |
30 | return -EINVAL; | |
31 | switch (a.op) { | |
32 | case BLKPG_ADD_PARTITION: | |
33 | start = p.start >> 9; | |
34 | length = p.length >> 9; | |
35 | /* check for fit in a hd_struct */ | |
36 | if (sizeof(sector_t) == sizeof(long) && | |
37 | sizeof(long long) > sizeof(long)) { | |
38 | long pstart = start, plength = length; | |
39 | if (pstart != start || plength != length | |
40 | || pstart < 0 || plength < 0) | |
41 | return -EINVAL; | |
42 | } | |
43 | /* partition number in use? */ | |
44 | down(&bdev->bd_sem); | |
45 | if (disk->part[part - 1]) { | |
46 | up(&bdev->bd_sem); | |
47 | return -EBUSY; | |
48 | } | |
49 | /* overlap? */ | |
50 | for (i = 0; i < disk->minors - 1; i++) { | |
51 | struct hd_struct *s = disk->part[i]; | |
52 | ||
53 | if (!s) | |
54 | continue; | |
55 | if (!(start+length <= s->start_sect || | |
56 | start >= s->start_sect + s->nr_sects)) { | |
57 | up(&bdev->bd_sem); | |
58 | return -EBUSY; | |
59 | } | |
60 | } | |
61 | /* all seems OK */ | |
62 | add_partition(disk, part, start, length); | |
63 | up(&bdev->bd_sem); | |
64 | return 0; | |
65 | case BLKPG_DEL_PARTITION: | |
66 | if (!disk->part[part-1]) | |
67 | return -ENXIO; | |
68 | if (disk->part[part - 1]->nr_sects == 0) | |
69 | return -ENXIO; | |
70 | bdevp = bdget_disk(disk, part); | |
71 | if (!bdevp) | |
72 | return -ENOMEM; | |
73 | down(&bdevp->bd_sem); | |
74 | if (bdevp->bd_openers) { | |
75 | up(&bdevp->bd_sem); | |
76 | bdput(bdevp); | |
77 | return -EBUSY; | |
78 | } | |
79 | /* all seems OK */ | |
80 | fsync_bdev(bdevp); | |
81 | invalidate_bdev(bdevp, 0); | |
82 | ||
83 | down(&bdev->bd_sem); | |
84 | delete_partition(disk, part); | |
85 | up(&bdev->bd_sem); | |
86 | up(&bdevp->bd_sem); | |
87 | bdput(bdevp); | |
88 | ||
89 | return 0; | |
90 | default: | |
91 | return -EINVAL; | |
92 | } | |
93 | } | |
94 | ||
95 | static int blkdev_reread_part(struct block_device *bdev) | |
96 | { | |
97 | struct gendisk *disk = bdev->bd_disk; | |
98 | int res; | |
99 | ||
100 | if (disk->minors == 1 || bdev != bdev->bd_contains) | |
101 | return -EINVAL; | |
102 | if (!capable(CAP_SYS_ADMIN)) | |
103 | return -EACCES; | |
104 | if (down_trylock(&bdev->bd_sem)) | |
105 | return -EBUSY; | |
106 | res = rescan_partitions(disk, bdev); | |
107 | up(&bdev->bd_sem); | |
108 | return res; | |
109 | } | |
110 | ||
111 | static int put_ushort(unsigned long arg, unsigned short val) | |
112 | { | |
113 | return put_user(val, (unsigned short __user *)arg); | |
114 | } | |
115 | ||
116 | static int put_int(unsigned long arg, int val) | |
117 | { | |
118 | return put_user(val, (int __user *)arg); | |
119 | } | |
120 | ||
121 | static int put_long(unsigned long arg, long val) | |
122 | { | |
123 | return put_user(val, (long __user *)arg); | |
124 | } | |
125 | ||
126 | static int put_ulong(unsigned long arg, unsigned long val) | |
127 | { | |
128 | return put_user(val, (unsigned long __user *)arg); | |
129 | } | |
130 | ||
131 | static int put_u64(unsigned long arg, u64 val) | |
132 | { | |
133 | return put_user(val, (u64 __user *)arg); | |
134 | } | |
135 | ||
bb93e3a5 AB |
136 | static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev, |
137 | unsigned cmd, unsigned long arg) | |
1da177e4 | 138 | { |
1da177e4 LT |
139 | struct backing_dev_info *bdi; |
140 | int ret, n; | |
141 | ||
142 | switch (cmd) { | |
143 | case BLKRAGET: | |
144 | case BLKFRAGET: | |
145 | if (!arg) | |
146 | return -EINVAL; | |
147 | bdi = blk_get_backing_dev_info(bdev); | |
148 | if (bdi == NULL) | |
149 | return -ENOTTY; | |
150 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); | |
151 | case BLKROGET: | |
152 | return put_int(arg, bdev_read_only(bdev) != 0); | |
153 | case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */ | |
154 | return put_int(arg, block_size(bdev)); | |
155 | case BLKSSZGET: /* get block device hardware sector size */ | |
156 | return put_int(arg, bdev_hardsect_size(bdev)); | |
157 | case BLKSECTGET: | |
158 | return put_ushort(arg, bdev_get_queue(bdev)->max_sectors); | |
159 | case BLKRASET: | |
160 | case BLKFRASET: | |
161 | if(!capable(CAP_SYS_ADMIN)) | |
162 | return -EACCES; | |
163 | bdi = blk_get_backing_dev_info(bdev); | |
164 | if (bdi == NULL) | |
165 | return -ENOTTY; | |
166 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; | |
167 | return 0; | |
168 | case BLKBSZSET: | |
169 | /* set the logical block size */ | |
170 | if (!capable(CAP_SYS_ADMIN)) | |
171 | return -EACCES; | |
172 | if (!arg) | |
173 | return -EINVAL; | |
174 | if (get_user(n, (int __user *) arg)) | |
175 | return -EFAULT; | |
176 | if (bd_claim(bdev, file) < 0) | |
177 | return -EBUSY; | |
178 | ret = set_blocksize(bdev, n); | |
179 | bd_release(bdev); | |
180 | return ret; | |
181 | case BLKPG: | |
182 | return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); | |
183 | case BLKRRPART: | |
184 | return blkdev_reread_part(bdev); | |
185 | case BLKGETSIZE: | |
186 | if ((bdev->bd_inode->i_size >> 9) > ~0UL) | |
187 | return -EFBIG; | |
188 | return put_ulong(arg, bdev->bd_inode->i_size >> 9); | |
189 | case BLKGETSIZE64: | |
190 | return put_u64(arg, bdev->bd_inode->i_size); | |
bb93e3a5 AB |
191 | } |
192 | return -ENOIOCTLCMD; | |
193 | } | |
194 | ||
195 | static int blkdev_driver_ioctl(struct inode *inode, struct file *file, | |
196 | struct gendisk *disk, unsigned cmd, unsigned long arg) | |
197 | { | |
198 | int ret; | |
199 | if (disk->fops->unlocked_ioctl) | |
200 | return disk->fops->unlocked_ioctl(file, cmd, arg); | |
201 | ||
202 | if (disk->fops->ioctl) { | |
203 | lock_kernel(); | |
204 | ret = disk->fops->ioctl(inode, file, cmd, arg); | |
205 | unlock_kernel(); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | return -ENOTTY; | |
210 | } | |
211 | ||
212 | int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd, | |
213 | unsigned long arg) | |
214 | { | |
215 | struct block_device *bdev = inode->i_bdev; | |
216 | struct gendisk *disk = bdev->bd_disk; | |
217 | int ret, n; | |
218 | ||
219 | switch(cmd) { | |
1da177e4 LT |
220 | case BLKFLSBUF: |
221 | if (!capable(CAP_SYS_ADMIN)) | |
222 | return -EACCES; | |
bb93e3a5 AB |
223 | |
224 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
225 | /* -EINVAL to handle old uncorrected drivers */ | |
226 | if (ret != -EINVAL && ret != -ENOTTY) | |
227 | return ret; | |
228 | ||
229 | lock_kernel(); | |
1da177e4 LT |
230 | fsync_bdev(bdev); |
231 | invalidate_bdev(bdev, 0); | |
bb93e3a5 | 232 | unlock_kernel(); |
1da177e4 | 233 | return 0; |
bb93e3a5 | 234 | |
1da177e4 | 235 | case BLKROSET: |
bb93e3a5 AB |
236 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
237 | /* -EINVAL to handle old uncorrected drivers */ | |
238 | if (ret != -EINVAL && ret != -ENOTTY) | |
239 | return ret; | |
1da177e4 LT |
240 | if (!capable(CAP_SYS_ADMIN)) |
241 | return -EACCES; | |
242 | if (get_user(n, (int __user *)(arg))) | |
243 | return -EFAULT; | |
bb93e3a5 | 244 | lock_kernel(); |
1da177e4 | 245 | set_device_ro(bdev, n); |
bb93e3a5 | 246 | unlock_kernel(); |
1da177e4 | 247 | return 0; |
1da177e4 | 248 | } |
bb93e3a5 AB |
249 | |
250 | lock_kernel(); | |
251 | ret = blkdev_locked_ioctl(file, bdev, cmd, arg); | |
252 | unlock_kernel(); | |
253 | if (ret != -ENOIOCTLCMD) | |
254 | return ret; | |
255 | ||
256 | return blkdev_driver_ioctl(inode, file, disk, cmd, arg); | |
1da177e4 LT |
257 | } |
258 | ||
259 | /* Most of the generic ioctls are handled in the normal fallback path. | |
260 | This assumes the blkdev's low level compat_ioctl always returns | |
261 | ENOIOCTLCMD for unknown ioctls. */ | |
262 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
263 | { | |
264 | struct block_device *bdev = file->f_dentry->d_inode->i_bdev; | |
265 | struct gendisk *disk = bdev->bd_disk; | |
266 | int ret = -ENOIOCTLCMD; | |
267 | if (disk->fops->compat_ioctl) { | |
268 | lock_kernel(); | |
269 | ret = disk->fops->compat_ioctl(file, cmd, arg); | |
270 | unlock_kernel(); | |
271 | } | |
272 | return ret; | |
273 | } | |
68f66feb ST |
274 | |
275 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |