bnx2: Use proper handler during netpoll.
[linux-2.6.git] / block / ioctl.c
1 #include <linux/capability.h>
2 #include <linux/blkdev.h>
3 #include <linux/blkpg.h>
4 #include <linux/hdreg.h>
5 #include <linux/backing-dev.h>
6 #include <linux/buffer_head.h>
7 #include <linux/smp_lock.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);
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)
117 {
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;
127         return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
128                                     DISCARD_FL_WAIT);
129 }
130
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_uint(unsigned long arg, unsigned int val)
142 {
143         return put_user(val, (unsigned int __user *)arg);
144 }
145
146 static int put_long(unsigned long arg, long val)
147 {
148         return put_user(val, (long __user *)arg);
149 }
150
151 static int put_ulong(unsigned long arg, unsigned long val)
152 {
153         return put_user(val, (unsigned long __user *)arg);
154 }
155
156 static int put_u64(unsigned long arg, u64 val)
157 {
158         return put_user(val, (u64 __user *)arg);
159 }
160
161 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
162                         unsigned cmd, unsigned long arg)
163 {
164         struct gendisk *disk = bdev->bd_disk;
165         int ret;
166
167         if (disk->fops->ioctl)
168                 return disk->fops->ioctl(bdev, mode, cmd, arg);
169
170         if (disk->fops->locked_ioctl) {
171                 lock_kernel();
172                 ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
173                 unlock_kernel();
174                 return ret;
175         }
176
177         return -ENOTTY;
178 }
179 /*
180  * For the record: _GPL here is only because somebody decided to slap it
181  * on the previous export.  Sheer idiocy, since it wasn't copyrightable
182  * at all and could be open-coded without any exports by anybody who cares.
183  */
184 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
185
186 /*
187  * always keep this in sync with compat_blkdev_ioctl() and
188  * compat_blkdev_locked_ioctl()
189  */
190 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
191                         unsigned long arg)
192 {
193         struct gendisk *disk = bdev->bd_disk;
194         struct backing_dev_info *bdi;
195         loff_t size;
196         int ret, n;
197
198         switch(cmd) {
199         case BLKFLSBUF:
200                 if (!capable(CAP_SYS_ADMIN))
201                         return -EACCES;
202
203                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
204                 /* -EINVAL to handle old uncorrected drivers */
205                 if (ret != -EINVAL && ret != -ENOTTY)
206                         return ret;
207
208                 lock_kernel();
209                 fsync_bdev(bdev);
210                 invalidate_bdev(bdev);
211                 unlock_kernel();
212                 return 0;
213
214         case BLKROSET:
215                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
216                 /* -EINVAL to handle old uncorrected drivers */
217                 if (ret != -EINVAL && ret != -ENOTTY)
218                         return ret;
219                 if (!capable(CAP_SYS_ADMIN))
220                         return -EACCES;
221                 if (get_user(n, (int __user *)(arg)))
222                         return -EFAULT;
223                 lock_kernel();
224                 set_device_ro(bdev, n);
225                 unlock_kernel();
226                 return 0;
227
228         case BLKDISCARD: {
229                 uint64_t range[2];
230
231                 if (!(mode & FMODE_WRITE))
232                         return -EBADF;
233
234                 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
235                         return -EFAULT;
236
237                 return blk_ioctl_discard(bdev, range[0], range[1]);
238         }
239
240         case HDIO_GETGEO: {
241                 struct hd_geometry geo;
242
243                 if (!arg)
244                         return -EINVAL;
245                 if (!disk->fops->getgeo)
246                         return -ENOTTY;
247
248                 /*
249                  * We need to set the startsect first, the driver may
250                  * want to override it.
251                  */
252                 geo.start = get_start_sect(bdev);
253                 ret = disk->fops->getgeo(bdev, &geo);
254                 if (ret)
255                         return ret;
256                 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
257                                         sizeof(geo)))
258                         return -EFAULT;
259                 return 0;
260         }
261         case BLKRAGET:
262         case BLKFRAGET:
263                 if (!arg)
264                         return -EINVAL;
265                 bdi = blk_get_backing_dev_info(bdev);
266                 if (bdi == NULL)
267                         return -ENOTTY;
268                 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
269         case BLKROGET:
270                 return put_int(arg, bdev_read_only(bdev) != 0);
271         case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
272                 return put_int(arg, block_size(bdev));
273         case BLKSSZGET: /* get block device logical block size */
274                 return put_int(arg, bdev_logical_block_size(bdev));
275         case BLKPBSZGET: /* get block device physical block size */
276                 return put_uint(arg, bdev_physical_block_size(bdev));
277         case BLKIOMIN:
278                 return put_uint(arg, bdev_io_min(bdev));
279         case BLKIOOPT:
280                 return put_uint(arg, bdev_io_opt(bdev));
281         case BLKALIGNOFF:
282                 return put_int(arg, bdev_alignment_offset(bdev));
283         case BLKDISCARDZEROES:
284                 return put_uint(arg, bdev_discard_zeroes_data(bdev));
285         case BLKSECTGET:
286                 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
287         case BLKRASET:
288         case BLKFRASET:
289                 if(!capable(CAP_SYS_ADMIN))
290                         return -EACCES;
291                 bdi = blk_get_backing_dev_info(bdev);
292                 if (bdi == NULL)
293                         return -ENOTTY;
294                 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
295                 return 0;
296         case BLKBSZSET:
297                 /* set the logical block size */
298                 if (!capable(CAP_SYS_ADMIN))
299                         return -EACCES;
300                 if (!arg)
301                         return -EINVAL;
302                 if (get_user(n, (int __user *) arg))
303                         return -EFAULT;
304                 if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
305                         return -EBUSY;
306                 ret = set_blocksize(bdev, n);
307                 if (!(mode & FMODE_EXCL))
308                         bd_release(bdev);
309                 return ret;
310         case BLKPG:
311                 lock_kernel();
312                 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
313                 unlock_kernel();
314                 break;
315         case BLKRRPART:
316                 lock_kernel();
317                 ret = blkdev_reread_part(bdev);
318                 unlock_kernel();
319                 break;
320         case BLKGETSIZE:
321                 size = bdev->bd_inode->i_size;
322                 if ((size >> 9) > ~0UL)
323                         return -EFBIG;
324                 return put_ulong(arg, size >> 9);
325         case BLKGETSIZE64:
326                 return put_u64(arg, bdev->bd_inode->i_size);
327         case BLKTRACESTART:
328         case BLKTRACESTOP:
329         case BLKTRACESETUP:
330         case BLKTRACETEARDOWN:
331                 lock_kernel();
332                 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
333                 unlock_kernel();
334                 break;
335         default:
336                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
337         }
338         return ret;
339 }
340 EXPORT_SYMBOL_GPL(blkdev_ioctl);