block: remove BKL from BLKROSET and BLKFLSBUF
[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/smp_lock.h>
9 #include <linux/blktrace_api.h>
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;
16         struct hd_struct *part;
17         struct blkpg_ioctl_arg a;
18         struct blkpg_partition p;
19         struct disk_part_iter piter;
20         long long start, length;
21         int partno;
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;
32         partno = p.pno;
33         if (partno <= 0)
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                         }
47
48                         mutex_lock(&bdev->bd_mutex);
49
50                         /* overlap? */
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);
57                                         mutex_unlock(&bdev->bd_mutex);
58                                         return -EBUSY;
59                                 }
60                         }
61                         disk_part_iter_exit(&piter);
62
63                         /* all seems OK */
64                         part = add_partition(disk, partno, start, length,
65                                              ADDPART_FLAG_NONE);
66                         mutex_unlock(&bdev->bd_mutex);
67                         return IS_ERR(part) ? PTR_ERR(part) : 0;
68                 case BLKPG_DEL_PARTITION:
69                         part = disk_get_part(disk, partno);
70                         if (!part)
71                                 return -ENXIO;
72
73                         bdevp = bdget(part_devt(part));
74                         disk_put_part(part);
75                         if (!bdevp)
76                                 return -ENOMEM;
77
78                         mutex_lock(&bdevp->bd_mutex);
79                         if (bdevp->bd_openers) {
80                                 mutex_unlock(&bdevp->bd_mutex);
81                                 bdput(bdevp);
82                                 return -EBUSY;
83                         }
84                         /* all seems OK */
85                         fsync_bdev(bdevp);
86                         invalidate_bdev(bdevp);
87
88                         mutex_lock_nested(&bdev->bd_mutex, 1);
89                         delete_partition(disk, partno);
90                         mutex_unlock(&bdev->bd_mutex);
91                         mutex_unlock(&bdevp->bd_mutex);
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
105         if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
106                 return -EINVAL;
107         if (!capable(CAP_SYS_ADMIN))
108                 return -EACCES;
109         if (!mutex_trylock(&bdev->bd_mutex))
110                 return -EBUSY;
111         res = rescan_partitions(disk, bdev);
112         mutex_unlock(&bdev->bd_mutex);
113         return res;
114 }
115
116 static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
117                              uint64_t len)
118 {
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;
128         return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
129                                     BLKDEV_IFL_WAIT);
130 }
131
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
142 static int put_uint(unsigned long arg, unsigned int val)
143 {
144         return put_user(val, (unsigned int __user *)arg);
145 }
146
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
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;
166
167         if (disk->fops->ioctl)
168                 return disk->fops->ioctl(bdev, mode, cmd, arg);
169
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
179 /*
180  * always keep this in sync with compat_blkdev_ioctl()
181  */
182 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
183                         unsigned long arg)
184 {
185         struct gendisk *disk = bdev->bd_disk;
186         struct backing_dev_info *bdi;
187         loff_t size;
188         int ret, n;
189
190         switch(cmd) {
191         case BLKFLSBUF:
192                 if (!capable(CAP_SYS_ADMIN))
193                         return -EACCES;
194
195                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
196                 /* -EINVAL to handle old uncorrected drivers */
197                 if (ret != -EINVAL && ret != -ENOTTY)
198                         return ret;
199
200                 fsync_bdev(bdev);
201                 invalidate_bdev(bdev);
202                 return 0;
203
204         case BLKROSET:
205                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
206                 /* -EINVAL to handle old uncorrected drivers */
207                 if (ret != -EINVAL && ret != -ENOTTY)
208                         return ret;
209                 if (!capable(CAP_SYS_ADMIN))
210                         return -EACCES;
211                 if (get_user(n, (int __user *)(arg)))
212                         return -EFAULT;
213                 set_device_ro(bdev, n);
214                 return 0;
215
216         case BLKDISCARD: {
217                 uint64_t range[2];
218
219                 if (!(mode & FMODE_WRITE))
220                         return -EBADF;
221
222                 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
223                         return -EFAULT;
224
225                 return blk_ioctl_discard(bdev, range[0], range[1]);
226         }
227
228         case HDIO_GETGEO: {
229                 struct hd_geometry geo;
230
231                 if (!arg)
232                         return -EINVAL;
233                 if (!disk->fops->getgeo)
234                         return -ENOTTY;
235
236                 /*
237                  * We need to set the startsect first, the driver may
238                  * want to override it.
239                  */
240                 geo.start = get_start_sect(bdev);
241                 ret = disk->fops->getgeo(bdev, &geo);
242                 if (ret)
243                         return ret;
244                 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
245                                         sizeof(geo)))
246                         return -EFAULT;
247                 return 0;
248         }
249         case BLKRAGET:
250         case BLKFRAGET:
251                 if (!arg)
252                         return -EINVAL;
253                 bdi = blk_get_backing_dev_info(bdev);
254                 if (bdi == NULL)
255                         return -ENOTTY;
256                 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
257         case BLKROGET:
258                 return put_int(arg, bdev_read_only(bdev) != 0);
259         case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
260                 return put_int(arg, block_size(bdev));
261         case BLKSSZGET: /* get block device logical block size */
262                 return put_int(arg, bdev_logical_block_size(bdev));
263         case BLKPBSZGET: /* get block device physical block size */
264                 return put_uint(arg, bdev_physical_block_size(bdev));
265         case BLKIOMIN:
266                 return put_uint(arg, bdev_io_min(bdev));
267         case BLKIOOPT:
268                 return put_uint(arg, bdev_io_opt(bdev));
269         case BLKALIGNOFF:
270                 return put_int(arg, bdev_alignment_offset(bdev));
271         case BLKDISCARDZEROES:
272                 return put_uint(arg, bdev_discard_zeroes_data(bdev));
273         case BLKSECTGET:
274                 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
275         case BLKRASET:
276         case BLKFRASET:
277                 if(!capable(CAP_SYS_ADMIN))
278                         return -EACCES;
279                 bdi = blk_get_backing_dev_info(bdev);
280                 if (bdi == NULL)
281                         return -ENOTTY;
282                 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
283                 return 0;
284         case BLKBSZSET:
285                 /* set the logical block size */
286                 if (!capable(CAP_SYS_ADMIN))
287                         return -EACCES;
288                 if (!arg)
289                         return -EINVAL;
290                 if (get_user(n, (int __user *) arg))
291                         return -EFAULT;
292                 if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
293                         return -EBUSY;
294                 ret = set_blocksize(bdev, n);
295                 if (!(mode & FMODE_EXCL))
296                         bd_release(bdev);
297                 return ret;
298         case BLKPG:
299                 lock_kernel();
300                 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
301                 unlock_kernel();
302                 break;
303         case BLKRRPART:
304                 lock_kernel();
305                 ret = blkdev_reread_part(bdev);
306                 unlock_kernel();
307                 break;
308         case BLKGETSIZE:
309                 size = bdev->bd_inode->i_size;
310                 if ((size >> 9) > ~0UL)
311                         return -EFBIG;
312                 return put_ulong(arg, size >> 9);
313         case BLKGETSIZE64:
314                 return put_u64(arg, bdev->bd_inode->i_size);
315         case BLKTRACESTART:
316         case BLKTRACESTOP:
317         case BLKTRACESETUP:
318         case BLKTRACETEARDOWN:
319                 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
320                 break;
321         default:
322                 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
323         }
324         return ret;
325 }
326 EXPORT_SYMBOL_GPL(blkdev_ioctl);