]>
Commit | Line | Data |
---|---|---|
c59ede7b | 1 | #include <linux/capability.h> |
1da177e4 | 2 | #include <linux/blkdev.h> |
5a0e3ad6 | 3 | #include <linux/gfp.h> |
1da177e4 | 4 | #include <linux/blkpg.h> |
a885c8c4 | 5 | #include <linux/hdreg.h> |
1da177e4 LT |
6 | #include <linux/backing-dev.h> |
7 | #include <linux/buffer_head.h> | |
8 | #include <linux/smp_lock.h> | |
2056a782 | 9 | #include <linux/blktrace_api.h> |
1da177e4 LT |
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; | |
e71bf0d0 | 16 | struct hd_struct *part; |
1da177e4 LT |
17 | struct blkpg_ioctl_arg a; |
18 | struct blkpg_partition p; | |
e71bf0d0 | 19 | struct disk_part_iter piter; |
1da177e4 | 20 | long long start, length; |
cf771cb5 | 21 | int partno; |
1da177e4 LT |
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; | |
cf771cb5 | 32 | partno = p.pno; |
540eed56 | 33 | if (partno <= 0) |
1da177e4 LT |
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 | } | |
88e34126 | 47 | |
c039e313 | 48 | mutex_lock(&bdev->bd_mutex); |
88e34126 | 49 | |
1da177e4 | 50 | /* overlap? */ |
e71bf0d0 TH |
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); | |
c039e313 | 57 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
58 | return -EBUSY; |
59 | } | |
60 | } | |
e71bf0d0 TH |
61 | disk_part_iter_exit(&piter); |
62 | ||
1da177e4 | 63 | /* all seems OK */ |
ba32929a TH |
64 | part = add_partition(disk, partno, start, length, |
65 | ADDPART_FLAG_NONE); | |
c039e313 | 66 | mutex_unlock(&bdev->bd_mutex); |
ba32929a | 67 | return IS_ERR(part) ? PTR_ERR(part) : 0; |
1da177e4 | 68 | case BLKPG_DEL_PARTITION: |
e71bf0d0 TH |
69 | part = disk_get_part(disk, partno); |
70 | if (!part) | |
1da177e4 | 71 | return -ENXIO; |
e71bf0d0 TH |
72 | |
73 | bdevp = bdget(part_devt(part)); | |
74 | disk_put_part(part); | |
1da177e4 LT |
75 | if (!bdevp) |
76 | return -ENOMEM; | |
e71bf0d0 | 77 | |
2e7b651d | 78 | mutex_lock(&bdevp->bd_mutex); |
1da177e4 | 79 | if (bdevp->bd_openers) { |
c039e313 | 80 | mutex_unlock(&bdevp->bd_mutex); |
1da177e4 LT |
81 | bdput(bdevp); |
82 | return -EBUSY; | |
83 | } | |
84 | /* all seems OK */ | |
85 | fsync_bdev(bdevp); | |
f98393a6 | 86 | invalidate_bdev(bdevp); |
1da177e4 | 87 | |
6d740cd5 | 88 | mutex_lock_nested(&bdev->bd_mutex, 1); |
cf771cb5 | 89 | delete_partition(disk, partno); |
c039e313 AV |
90 | mutex_unlock(&bdev->bd_mutex); |
91 | mutex_unlock(&bdevp->bd_mutex); | |
1da177e4 LT |
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 | ||
b5d0b9df | 105 | if (!disk_partitionable(disk) || bdev != bdev->bd_contains) |
1da177e4 LT |
106 | return -EINVAL; |
107 | if (!capable(CAP_SYS_ADMIN)) | |
108 | return -EACCES; | |
c039e313 | 109 | if (!mutex_trylock(&bdev->bd_mutex)) |
1da177e4 LT |
110 | return -EBUSY; |
111 | res = rescan_partitions(disk, bdev); | |
c039e313 | 112 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
113 | return res; |
114 | } | |
115 | ||
d30a2605 DW |
116 | static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, |
117 | uint64_t len) | |
118 | { | |
d30a2605 DW |
119 | if (start & 511) |
120 | return -EINVAL; | |
121 | if (len & 511) | |
122 | return -EINVAL; | |
123 | start >>= 9; | |
124 | len >>= 9; | |
125 | ||
126 | if (start + len > (bdev->bd_inode->i_size >> 9)) | |
127 | return -EINVAL; | |
746cd1e7 | 128 | return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, |
fbd9b09a | 129 | BLKDEV_IFL_WAIT); |
d30a2605 DW |
130 | } |
131 | ||
1da177e4 LT |
132 | static int put_ushort(unsigned long arg, unsigned short val) |
133 | { | |
134 | return put_user(val, (unsigned short __user *)arg); | |
135 | } | |
136 | ||
137 | static int put_int(unsigned long arg, int val) | |
138 | { | |
139 | return put_user(val, (int __user *)arg); | |
140 | } | |
141 | ||
ac481c20 MP |
142 | static int put_uint(unsigned long arg, unsigned int val) |
143 | { | |
144 | return put_user(val, (unsigned int __user *)arg); | |
145 | } | |
146 | ||
1da177e4 LT |
147 | static int put_long(unsigned long arg, long val) |
148 | { | |
149 | return put_user(val, (long __user *)arg); | |
150 | } | |
151 | ||
152 | static int put_ulong(unsigned long arg, unsigned long val) | |
153 | { | |
154 | return put_user(val, (unsigned long __user *)arg); | |
155 | } | |
156 | ||
157 | static int put_u64(unsigned long arg, u64 val) | |
158 | { | |
159 | return put_user(val, (u64 __user *)arg); | |
160 | } | |
161 | ||
633a08b8 AV |
162 | int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
163 | unsigned cmd, unsigned long arg) | |
164 | { | |
165 | struct gendisk *disk = bdev->bd_disk; | |
d4430d62 AV |
166 | |
167 | if (disk->fops->ioctl) | |
168 | return disk->fops->ioctl(bdev, mode, cmd, arg); | |
633a08b8 | 169 | |
633a08b8 AV |
170 | return -ENOTTY; |
171 | } | |
172 | /* | |
173 | * For the record: _GPL here is only because somebody decided to slap it | |
174 | * on the previous export. Sheer idiocy, since it wasn't copyrightable | |
175 | * at all and could be open-coded without any exports by anybody who cares. | |
176 | */ | |
177 | EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); | |
178 | ||
f58c4c0a | 179 | /* |
8a6cfeb6 | 180 | * always keep this in sync with compat_blkdev_ioctl() |
f58c4c0a | 181 | */ |
56b26add | 182 | int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
bb93e3a5 AB |
183 | unsigned long arg) |
184 | { | |
bb93e3a5 | 185 | struct gendisk *disk = bdev->bd_disk; |
45048d09 AV |
186 | struct backing_dev_info *bdi; |
187 | loff_t size; | |
bb93e3a5 AB |
188 | int ret, n; |
189 | ||
190 | switch(cmd) { | |
1da177e4 LT |
191 | case BLKFLSBUF: |
192 | if (!capable(CAP_SYS_ADMIN)) | |
193 | return -EACCES; | |
bb93e3a5 | 194 | |
e436fdae | 195 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
bb93e3a5 AB |
196 | /* -EINVAL to handle old uncorrected drivers */ |
197 | if (ret != -EINVAL && ret != -ENOTTY) | |
198 | return ret; | |
199 | ||
200 | lock_kernel(); | |
1da177e4 | 201 | fsync_bdev(bdev); |
f98393a6 | 202 | invalidate_bdev(bdev); |
bb93e3a5 | 203 | unlock_kernel(); |
1da177e4 | 204 | return 0; |
bb93e3a5 | 205 | |
1da177e4 | 206 | case BLKROSET: |
e436fdae | 207 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
bb93e3a5 AB |
208 | /* -EINVAL to handle old uncorrected drivers */ |
209 | if (ret != -EINVAL && ret != -ENOTTY) | |
210 | return ret; | |
1da177e4 LT |
211 | if (!capable(CAP_SYS_ADMIN)) |
212 | return -EACCES; | |
213 | if (get_user(n, (int __user *)(arg))) | |
214 | return -EFAULT; | |
bb93e3a5 | 215 | lock_kernel(); |
1da177e4 | 216 | set_device_ro(bdev, n); |
bb93e3a5 | 217 | unlock_kernel(); |
1da177e4 | 218 | return 0; |
d30a2605 DW |
219 | |
220 | case BLKDISCARD: { | |
221 | uint64_t range[2]; | |
222 | ||
e436fdae | 223 | if (!(mode & FMODE_WRITE)) |
d30a2605 DW |
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 | } | |
231 | ||
a885c8c4 CH |
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 | geo.start = get_start_sect(bdev); | |
245 | ret = disk->fops->getgeo(bdev, &geo); | |
246 | if (ret) | |
247 | return ret; | |
248 | if (copy_to_user((struct hd_geometry __user *)arg, &geo, | |
249 | sizeof(geo))) | |
250 | return -EFAULT; | |
251 | return 0; | |
252 | } | |
45048d09 AV |
253 | case BLKRAGET: |
254 | case BLKFRAGET: | |
255 | if (!arg) | |
256 | return -EINVAL; | |
257 | bdi = blk_get_backing_dev_info(bdev); | |
258 | if (bdi == NULL) | |
259 | return -ENOTTY; | |
260 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); | |
261 | case BLKROGET: | |
262 | return put_int(arg, bdev_read_only(bdev) != 0); | |
ac481c20 | 263 | case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ |
45048d09 | 264 | return put_int(arg, block_size(bdev)); |
ac481c20 | 265 | case BLKSSZGET: /* get block device logical block size */ |
e1defc4f | 266 | return put_int(arg, bdev_logical_block_size(bdev)); |
ac481c20 MP |
267 | case BLKPBSZGET: /* get block device physical block size */ |
268 | return put_uint(arg, bdev_physical_block_size(bdev)); | |
269 | case BLKIOMIN: | |
270 | return put_uint(arg, bdev_io_min(bdev)); | |
271 | case BLKIOOPT: | |
272 | return put_uint(arg, bdev_io_opt(bdev)); | |
273 | case BLKALIGNOFF: | |
274 | return put_int(arg, bdev_alignment_offset(bdev)); | |
98262f27 MP |
275 | case BLKDISCARDZEROES: |
276 | return put_uint(arg, bdev_discard_zeroes_data(bdev)); | |
45048d09 | 277 | case BLKSECTGET: |
ae03bf63 | 278 | return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev))); |
45048d09 AV |
279 | case BLKRASET: |
280 | case BLKFRASET: | |
281 | if(!capable(CAP_SYS_ADMIN)) | |
282 | return -EACCES; | |
283 | bdi = blk_get_backing_dev_info(bdev); | |
284 | if (bdi == NULL) | |
285 | return -ENOTTY; | |
45048d09 | 286 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; |
45048d09 AV |
287 | return 0; |
288 | case BLKBSZSET: | |
289 | /* set the logical block size */ | |
290 | if (!capable(CAP_SYS_ADMIN)) | |
291 | return -EACCES; | |
292 | if (!arg) | |
293 | return -EINVAL; | |
294 | if (get_user(n, (int __user *) arg)) | |
295 | return -EFAULT; | |
6af3a56e | 296 | if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0) |
45048d09 AV |
297 | return -EBUSY; |
298 | ret = set_blocksize(bdev, n); | |
6af3a56e AV |
299 | if (!(mode & FMODE_EXCL)) |
300 | bd_release(bdev); | |
bb93e3a5 | 301 | return ret; |
45048d09 AV |
302 | case BLKPG: |
303 | lock_kernel(); | |
304 | ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); | |
305 | unlock_kernel(); | |
306 | break; | |
307 | case BLKRRPART: | |
308 | lock_kernel(); | |
309 | ret = blkdev_reread_part(bdev); | |
310 | unlock_kernel(); | |
311 | break; | |
312 | case BLKGETSIZE: | |
313 | size = bdev->bd_inode->i_size; | |
314 | if ((size >> 9) > ~0UL) | |
315 | return -EFBIG; | |
316 | return put_ulong(arg, size >> 9); | |
317 | case BLKGETSIZE64: | |
318 | return put_u64(arg, bdev->bd_inode->i_size); | |
319 | case BLKTRACESTART: | |
320 | case BLKTRACESTOP: | |
321 | case BLKTRACESETUP: | |
322 | case BLKTRACETEARDOWN: | |
323 | lock_kernel(); | |
324 | ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg); | |
325 | unlock_kernel(); | |
326 | break; | |
327 | default: | |
328 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
329 | } | |
330 | return ret; | |
1da177e4 | 331 | } |
68f66feb | 332 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |