BKL: remove extraneous #include <smp_lock.h>
[linux-2.6.git] / block / ioctl.c
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/blktrace_api.h>
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 hd_struct *part;
16         struct blkpg_ioctl_arg a;
17         struct blkpg_partition p;
18         struct disk_part_iter piter;
19         long long start, length;
20         int partno;
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         partno = p.pno;
32         if (partno <= 0)
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
47                         mutex_lock(&bdev->bd_mutex);
48
49                         /* overlap? */
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);
56                                         mutex_unlock(&bdev->bd_mutex);
57                                         return -EBUSY;
58                                 }
59                         }
60                         disk_part_iter_exit(&piter);
61
62                         /* all seems OK */
63                         part = add_partition(disk, partno, start, length,
64                                              ADDPART_FLAG_NONE, NULL);
65                         mutex_unlock(&bdev->bd_mutex);
66                         return IS_ERR(part) ? PTR_ERR(part) : 0;
67                 case BLKPG_DEL_PARTITION:
68                         part = disk_get_part(disk, partno);
69                         if (!part)
70                                 return -ENXIO;
71
72                         bdevp = bdget(part_devt(part));
73                         disk_put_part(part);
74                         if (!bdevp)
75                                 return -ENOMEM;
76
77                         mutex_lock(&bdevp->bd_mutex);
78                         if (bdevp->bd_openers) {
79                                 mutex_unlock(&bdevp->bd_mutex);
80                                 bdput(bdevp);
81                                 return -EBUSY;
82                         }
83                         /* all seems OK */
84                         fsync_bdev(bdevp);
85                         invalidate_bdev(bdevp);
86
87                         mutex_lock_nested(&bdev->bd_mutex, 1);
88                         delete_partition(disk, partno);
89                         mutex_unlock(&bdev->bd_mutex);
90                         mutex_unlock(&bdevp->bd_mutex);
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
104         if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
105                 return -EINVAL;
106         if (!capable(CAP_SYS_ADMIN))
107                 return -EACCES;
108         if (!mutex_trylock(&bdev->bd_mutex))
109                 return -EBUSY;
110         res = rescan_partitions(disk, bdev);
111         mutex_unlock(&bdev->bd_mutex);
112         return res;
113 }
114
115 static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
116                              uint64_t len, int secure)
117 {
118         unsigned long flags = 0;
119
120         if (start & 511)
121                 return -EINVAL;
122         if (len & 511)
123                 return -EINVAL;
124         start >>= 9;
125         len >>= 9;
126
127         if (start + len > (i_size_read(bdev->bd_inode) >> 9))
128                 return -EINVAL;
129         if (secure)
130                 flags |= BLKDEV_DISCARD_SECURE;
131         return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
132 }
133
134 static int put_ushort(unsigned long arg, unsigned short val)
135 {
136         return put_user(val, (unsigned short __user *)arg);
137 }
138
139 static int put_int(unsigned long arg, int val)
140 {
141         return put_user(val, (int __user *)arg);
142 }
143
144 static int put_uint(unsigned long arg, unsigned int val)
145 {
146         return put_user(val, (unsigned int __user *)arg);
147 }
148
149 static int put_long(unsigned long arg, long val)
150 {
151         return put_user(val, (long __user *)arg);
152 }
153
154 static int put_ulong(unsigned long arg, unsigned long val)
155 {
156         return put_user(val, (unsigned long __user *)arg);
157 }
158
159 static int put_u64(unsigned long arg, u64 val)
160 {
161         return put_user(val, (u64 __user *)arg);
162 }
163
164 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
165                         unsigned cmd, unsigned long arg)
166 {
167         struct gendisk *disk = bdev->bd_disk;
168
169         if (disk->fops->ioctl)
170                 return disk->fops->ioctl(bdev, mode, cmd, arg);
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
181 /*
182  * always keep this in sync with compat_blkdev_ioctl()
183  */
184 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
185                         unsigned long arg)
186 {
187         struct gendisk *disk = bdev->bd_disk;
188         struct backing_dev_info *bdi;
189         loff_t size;
190         int ret, n;
191
192         switch(cmd) {
193         case BLKFLSBUF:
194                 if (!capable(CAP_SYS_ADMIN))
195                         return -EACCES;
196
197                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
198                 /* -EINVAL to handle old uncorrected drivers */
199                 if (ret != -EINVAL && ret != -ENOTTY)
200                         return ret;
201
202                 fsync_bdev(bdev);
203                 invalidate_bdev(bdev);
204                 return 0;
205
206         case BLKROSET:
207                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
208                 /* -EINVAL to handle old uncorrected drivers */
209                 if (ret != -EINVAL && ret != -ENOTTY)
210                         return ret;
211                 if (!capable(CAP_SYS_ADMIN))
212                         return -EACCES;
213                 if (get_user(n, (int __user *)(arg)))
214                         return -EFAULT;
215                 set_device_ro(bdev, n);
216                 return 0;
217
218         case BLKDISCARD:
219         case BLKSECDISCARD: {
220                 uint64_t range[2];
221
222                 if (!(mode & FMODE_WRITE))
223                         return -EBADF;
224
225                 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
226                         return -EFAULT;
227
228                 return blk_ioctl_discard(bdev, range[0], range[1],
229                                          cmd == BLKSECDISCARD);
230         }
231
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                 memset(&geo, 0, sizeof(geo));
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 = i_size_read(bdev->bd_inode);
311                 if ((size >> 9) > ~0UL)
312                         return -EFBIG;
313                 return put_ulong(arg, size >> 9);
314         case BLKGETSIZE64:
315                 return put_u64(arg, i_size_read(bdev->bd_inode));
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);