Commit | Line | Data |
---|---|---|
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; | |
e71bf0d0 | 15 | struct hd_struct *part; |
1da177e4 LT |
16 | struct blkpg_ioctl_arg a; |
17 | struct blkpg_partition p; | |
e71bf0d0 | 18 | struct disk_part_iter piter; |
1da177e4 | 19 | long long start, length; |
cf771cb5 | 20 | int partno; |
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; | |
cf771cb5 | 31 | partno = p.pno; |
540eed56 | 32 | if (partno <= 0) |
1da177e4 LT |
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 | } | |
88e34126 | 46 | |
c039e313 | 47 | mutex_lock(&bdev->bd_mutex); |
88e34126 | 48 | |
1da177e4 | 49 | /* overlap? */ |
e71bf0d0 TH |
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); | |
c039e313 | 56 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
57 | return -EBUSY; |
58 | } | |
59 | } | |
e71bf0d0 TH |
60 | disk_part_iter_exit(&piter); |
61 | ||
1da177e4 | 62 | /* all seems OK */ |
ba32929a TH |
63 | part = add_partition(disk, partno, start, length, |
64 | ADDPART_FLAG_NONE); | |
c039e313 | 65 | mutex_unlock(&bdev->bd_mutex); |
ba32929a | 66 | return IS_ERR(part) ? PTR_ERR(part) : 0; |
1da177e4 | 67 | case BLKPG_DEL_PARTITION: |
e71bf0d0 TH |
68 | part = disk_get_part(disk, partno); |
69 | if (!part) | |
1da177e4 | 70 | return -ENXIO; |
e71bf0d0 TH |
71 | |
72 | bdevp = bdget(part_devt(part)); | |
73 | disk_put_part(part); | |
1da177e4 LT |
74 | if (!bdevp) |
75 | return -ENOMEM; | |
e71bf0d0 | 76 | |
2e7b651d | 77 | mutex_lock(&bdevp->bd_mutex); |
1da177e4 | 78 | if (bdevp->bd_openers) { |
c039e313 | 79 | mutex_unlock(&bdevp->bd_mutex); |
1da177e4 LT |
80 | bdput(bdevp); |
81 | return -EBUSY; | |
82 | } | |
83 | /* all seems OK */ | |
84 | fsync_bdev(bdevp); | |
f98393a6 | 85 | invalidate_bdev(bdevp); |
1da177e4 | 86 | |
6d740cd5 | 87 | mutex_lock_nested(&bdev->bd_mutex, 1); |
cf771cb5 | 88 | delete_partition(disk, partno); |
c039e313 AV |
89 | mutex_unlock(&bdev->bd_mutex); |
90 | mutex_unlock(&bdevp->bd_mutex); | |
1da177e4 LT |
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 | ||
b5d0b9df | 104 | if (!disk_partitionable(disk) || bdev != bdev->bd_contains) |
1da177e4 LT |
105 | return -EINVAL; |
106 | if (!capable(CAP_SYS_ADMIN)) | |
107 | return -EACCES; | |
c039e313 | 108 | if (!mutex_trylock(&bdev->bd_mutex)) |
1da177e4 LT |
109 | return -EBUSY; |
110 | res = rescan_partitions(disk, bdev); | |
c039e313 | 111 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
112 | return res; |
113 | } | |
114 | ||
d30a2605 DW |
115 | static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, |
116 | uint64_t len) | |
117 | { | |
d30a2605 DW |
118 | if (start & 511) |
119 | return -EINVAL; | |
120 | if (len & 511) | |
121 | return -EINVAL; | |
122 | start >>= 9; | |
123 | len >>= 9; | |
124 | ||
125 | if (start + len > (bdev->bd_inode->i_size >> 9)) | |
126 | return -EINVAL; | |
746cd1e7 CH |
127 | return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, |
128 | DISCARD_FL_WAIT); | |
d30a2605 DW |
129 | } |
130 | ||
1da177e4 LT |
131 | static int put_ushort(unsigned long arg, unsigned short val) |
132 | { | |
133 | return put_user(val, (unsigned short __user *)arg); | |
134 | } | |
135 | ||
136 | static int put_int(unsigned long arg, int val) | |
137 | { | |
138 | return put_user(val, (int __user *)arg); | |
139 | } | |
140 | ||
141 | static int put_long(unsigned long arg, long val) | |
142 | { | |
143 | return put_user(val, (long __user *)arg); | |
144 | } | |
145 | ||
146 | static int put_ulong(unsigned long arg, unsigned long val) | |
147 | { | |
148 | return put_user(val, (unsigned long __user *)arg); | |
149 | } | |
150 | ||
151 | static int put_u64(unsigned long arg, u64 val) | |
152 | { | |
153 | return put_user(val, (u64 __user *)arg); | |
154 | } | |
155 | ||
633a08b8 AV |
156 | int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
157 | unsigned cmd, unsigned long arg) | |
158 | { | |
159 | struct gendisk *disk = bdev->bd_disk; | |
160 | int ret; | |
d4430d62 AV |
161 | |
162 | if (disk->fops->ioctl) | |
163 | return disk->fops->ioctl(bdev, mode, cmd, arg); | |
633a08b8 | 164 | |
d4430d62 | 165 | if (disk->fops->locked_ioctl) { |
633a08b8 | 166 | lock_kernel(); |
d4430d62 | 167 | ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg); |
633a08b8 AV |
168 | unlock_kernel(); |
169 | return ret; | |
170 | } | |
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 | ||
f58c4c0a AB |
181 | /* |
182 | * always keep this in sync with compat_blkdev_ioctl() and | |
183 | * compat_blkdev_locked_ioctl() | |
184 | */ | |
56b26add | 185 | int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
bb93e3a5 AB |
186 | unsigned long arg) |
187 | { | |
bb93e3a5 | 188 | struct gendisk *disk = bdev->bd_disk; |
45048d09 AV |
189 | struct backing_dev_info *bdi; |
190 | loff_t size; | |
bb93e3a5 AB |
191 | int ret, n; |
192 | ||
193 | switch(cmd) { | |
1da177e4 LT |
194 | case BLKFLSBUF: |
195 | if (!capable(CAP_SYS_ADMIN)) | |
196 | return -EACCES; | |
bb93e3a5 | 197 | |
e436fdae | 198 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
bb93e3a5 AB |
199 | /* -EINVAL to handle old uncorrected drivers */ |
200 | if (ret != -EINVAL && ret != -ENOTTY) | |
201 | return ret; | |
202 | ||
203 | lock_kernel(); | |
1da177e4 | 204 | fsync_bdev(bdev); |
f98393a6 | 205 | invalidate_bdev(bdev); |
bb93e3a5 | 206 | unlock_kernel(); |
1da177e4 | 207 | return 0; |
bb93e3a5 | 208 | |
1da177e4 | 209 | case BLKROSET: |
e436fdae | 210 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
bb93e3a5 AB |
211 | /* -EINVAL to handle old uncorrected drivers */ |
212 | if (ret != -EINVAL && ret != -ENOTTY) | |
213 | return ret; | |
1da177e4 LT |
214 | if (!capable(CAP_SYS_ADMIN)) |
215 | return -EACCES; | |
216 | if (get_user(n, (int __user *)(arg))) | |
217 | return -EFAULT; | |
bb93e3a5 | 218 | lock_kernel(); |
1da177e4 | 219 | set_device_ro(bdev, n); |
bb93e3a5 | 220 | unlock_kernel(); |
1da177e4 | 221 | return 0; |
d30a2605 DW |
222 | |
223 | case BLKDISCARD: { | |
224 | uint64_t range[2]; | |
225 | ||
e436fdae | 226 | if (!(mode & FMODE_WRITE)) |
d30a2605 DW |
227 | return -EBADF; |
228 | ||
229 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) | |
230 | return -EFAULT; | |
231 | ||
232 | return blk_ioctl_discard(bdev, range[0], range[1]); | |
233 | } | |
234 | ||
a885c8c4 CH |
235 | case HDIO_GETGEO: { |
236 | struct hd_geometry geo; | |
237 | ||
238 | if (!arg) | |
239 | return -EINVAL; | |
240 | if (!disk->fops->getgeo) | |
241 | return -ENOTTY; | |
242 | ||
243 | /* | |
244 | * We need to set the startsect first, the driver may | |
245 | * want to override it. | |
246 | */ | |
247 | geo.start = get_start_sect(bdev); | |
248 | ret = disk->fops->getgeo(bdev, &geo); | |
249 | if (ret) | |
250 | return ret; | |
251 | if (copy_to_user((struct hd_geometry __user *)arg, &geo, | |
252 | sizeof(geo))) | |
253 | return -EFAULT; | |
254 | return 0; | |
255 | } | |
45048d09 AV |
256 | case BLKRAGET: |
257 | case BLKFRAGET: | |
258 | if (!arg) | |
259 | return -EINVAL; | |
260 | bdi = blk_get_backing_dev_info(bdev); | |
261 | if (bdi == NULL) | |
262 | return -ENOTTY; | |
263 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); | |
264 | case BLKROGET: | |
265 | return put_int(arg, bdev_read_only(bdev) != 0); | |
266 | case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */ | |
267 | return put_int(arg, block_size(bdev)); | |
268 | case BLKSSZGET: /* get block device hardware sector size */ | |
e1defc4f | 269 | return put_int(arg, bdev_logical_block_size(bdev)); |
45048d09 | 270 | case BLKSECTGET: |
ae03bf63 | 271 | return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev))); |
45048d09 AV |
272 | case BLKRASET: |
273 | case BLKFRASET: | |
274 | if(!capable(CAP_SYS_ADMIN)) | |
275 | return -EACCES; | |
276 | bdi = blk_get_backing_dev_info(bdev); | |
277 | if (bdi == NULL) | |
278 | return -ENOTTY; | |
45048d09 | 279 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; |
45048d09 AV |
280 | return 0; |
281 | case BLKBSZSET: | |
282 | /* set the logical block size */ | |
283 | if (!capable(CAP_SYS_ADMIN)) | |
284 | return -EACCES; | |
285 | if (!arg) | |
286 | return -EINVAL; | |
287 | if (get_user(n, (int __user *) arg)) | |
288 | return -EFAULT; | |
6af3a56e | 289 | if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0) |
45048d09 AV |
290 | return -EBUSY; |
291 | ret = set_blocksize(bdev, n); | |
6af3a56e AV |
292 | if (!(mode & FMODE_EXCL)) |
293 | bd_release(bdev); | |
bb93e3a5 | 294 | return ret; |
45048d09 AV |
295 | case BLKPG: |
296 | lock_kernel(); | |
297 | ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); | |
298 | unlock_kernel(); | |
299 | break; | |
300 | case BLKRRPART: | |
301 | lock_kernel(); | |
302 | ret = blkdev_reread_part(bdev); | |
303 | unlock_kernel(); | |
304 | break; | |
305 | case BLKGETSIZE: | |
306 | size = bdev->bd_inode->i_size; | |
307 | if ((size >> 9) > ~0UL) | |
308 | return -EFBIG; | |
309 | return put_ulong(arg, size >> 9); | |
310 | case BLKGETSIZE64: | |
311 | return put_u64(arg, bdev->bd_inode->i_size); | |
312 | case BLKTRACESTART: | |
313 | case BLKTRACESTOP: | |
314 | case BLKTRACESETUP: | |
315 | case BLKTRACETEARDOWN: | |
316 | lock_kernel(); | |
317 | ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg); | |
318 | unlock_kernel(); | |
319 | break; | |
320 | default: | |
321 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
322 | } | |
323 | return ret; | |
1da177e4 | 324 | } |
68f66feb | 325 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |