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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - 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>
11 static int blkpg_ioctl(struct block_device
*bdev
, struct blkpg_ioctl_arg __user
*arg
)
13 struct block_device
*bdevp
;
15 struct blkpg_ioctl_arg a
;
16 struct blkpg_partition p
;
17 long long start
, length
;
22 if (!capable(CAP_SYS_ADMIN
))
24 if (copy_from_user(&a
, arg
, sizeof(struct blkpg_ioctl_arg
)))
26 if (copy_from_user(&p
, a
.data
, sizeof(struct blkpg_partition
)))
29 if (bdev
!= bdev
->bd_contains
)
32 if (part
<= 0 || part
>= disk
->minors
)
35 case BLKPG_ADD_PARTITION
:
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)
46 /* partition number in use? */
47 mutex_lock(&bdev
->bd_mutex
);
48 if (disk
->part
[part
- 1]) {
49 mutex_unlock(&bdev
->bd_mutex
);
53 for (i
= 0; i
< disk
->minors
- 1; i
++) {
54 struct hd_struct
*s
= disk
->part
[i
];
58 if (!(start
+length
<= s
->start_sect
||
59 start
>= s
->start_sect
+ s
->nr_sects
)) {
60 mutex_unlock(&bdev
->bd_mutex
);
65 err
= add_partition(disk
, part
, start
, length
, ADDPART_FLAG_NONE
);
66 mutex_unlock(&bdev
->bd_mutex
);
68 case BLKPG_DEL_PARTITION
:
69 if (!disk
->part
[part
-1])
71 bdevp
= bdget_disk(disk
, part
);
74 mutex_lock(&bdevp
->bd_mutex
);
75 if (bdevp
->bd_openers
) {
76 mutex_unlock(&bdevp
->bd_mutex
);
82 invalidate_bdev(bdevp
);
84 mutex_lock_nested(&bdev
->bd_mutex
, 1);
85 delete_partition(disk
, part
);
86 mutex_unlock(&bdev
->bd_mutex
);
87 mutex_unlock(&bdevp
->bd_mutex
);
96 static int blkdev_reread_part(struct block_device
*bdev
)
98 struct gendisk
*disk
= bdev
->bd_disk
;
101 if (disk
->minors
== 1 || bdev
!= bdev
->bd_contains
)
103 if (!capable(CAP_SYS_ADMIN
))
105 if (!mutex_trylock(&bdev
->bd_mutex
))
107 res
= rescan_partitions(disk
, bdev
);
108 mutex_unlock(&bdev
->bd_mutex
);
112 static void blk_ioc_discard_endio(struct bio
*bio
, int err
)
115 if (err
== -EOPNOTSUPP
)
116 set_bit(BIO_EOPNOTSUPP
, &bio
->bi_flags
);
117 clear_bit(BIO_UPTODATE
, &bio
->bi_flags
);
119 complete(bio
->bi_private
);
122 static int blk_ioctl_discard(struct block_device
*bdev
, uint64_t start
,
125 struct request_queue
*q
= bdev_get_queue(bdev
);
135 if (start
+ len
> (bdev
->bd_inode
->i_size
>> 9))
138 if (!q
->prepare_discard_fn
)
141 while (len
&& !ret
) {
142 DECLARE_COMPLETION_ONSTACK(wait
);
145 bio
= bio_alloc(GFP_KERNEL
, 0);
149 bio
->bi_end_io
= blk_ioc_discard_endio
;
151 bio
->bi_private
= &wait
;
152 bio
->bi_sector
= start
;
154 if (len
> q
->max_hw_sectors
) {
155 bio
->bi_size
= q
->max_hw_sectors
<< 9;
156 len
-= q
->max_hw_sectors
;
157 start
+= q
->max_hw_sectors
;
159 bio
->bi_size
= len
<< 9;
162 submit_bio(DISCARD_NOBARRIER
, bio
);
164 wait_for_completion(&wait
);
166 if (bio_flagged(bio
, BIO_EOPNOTSUPP
))
168 else if (!bio_flagged(bio
, BIO_UPTODATE
))
175 static int put_ushort(unsigned long arg
, unsigned short val
)
177 return put_user(val
, (unsigned short __user
*)arg
);
180 static int put_int(unsigned long arg
, int val
)
182 return put_user(val
, (int __user
*)arg
);
185 static int put_long(unsigned long arg
, long val
)
187 return put_user(val
, (long __user
*)arg
);
190 static int put_ulong(unsigned long arg
, unsigned long val
)
192 return put_user(val
, (unsigned long __user
*)arg
);
195 static int put_u64(unsigned long arg
, u64 val
)
197 return put_user(val
, (u64 __user
*)arg
);
200 static int blkdev_locked_ioctl(struct file
*file
, struct block_device
*bdev
,
201 unsigned cmd
, unsigned long arg
)
203 struct backing_dev_info
*bdi
;
211 bdi
= blk_get_backing_dev_info(bdev
);
214 return put_long(arg
, (bdi
->ra_pages
* PAGE_CACHE_SIZE
) / 512);
216 return put_int(arg
, bdev_read_only(bdev
) != 0);
217 case BLKBSZGET
: /* get the logical block size (cf. BLKSSZGET) */
218 return put_int(arg
, block_size(bdev
));
219 case BLKSSZGET
: /* get block device hardware sector size */
220 return put_int(arg
, bdev_hardsect_size(bdev
));
222 return put_ushort(arg
, bdev_get_queue(bdev
)->max_sectors
);
225 if(!capable(CAP_SYS_ADMIN
))
227 bdi
= blk_get_backing_dev_info(bdev
);
230 bdi
->ra_pages
= (arg
* 512) / PAGE_CACHE_SIZE
;
233 /* set the logical block size */
234 if (!capable(CAP_SYS_ADMIN
))
238 if (get_user(n
, (int __user
*) arg
))
240 if (bd_claim(bdev
, file
) < 0)
242 ret
= set_blocksize(bdev
, n
);
246 return blkpg_ioctl(bdev
, (struct blkpg_ioctl_arg __user
*) arg
);
248 return blkdev_reread_part(bdev
);
250 if ((bdev
->bd_inode
->i_size
>> 9) > ~0UL)
252 return put_ulong(arg
, bdev
->bd_inode
->i_size
>> 9);
254 return put_u64(arg
, bdev
->bd_inode
->i_size
);
258 case BLKTRACETEARDOWN
:
259 return blk_trace_ioctl(bdev
, cmd
, (char __user
*) arg
);
264 int blkdev_driver_ioctl(struct inode
*inode
, struct file
*file
,
265 struct gendisk
*disk
, unsigned cmd
, unsigned long arg
)
268 if (disk
->fops
->unlocked_ioctl
)
269 return disk
->fops
->unlocked_ioctl(file
, cmd
, arg
);
271 if (disk
->fops
->ioctl
) {
273 ret
= disk
->fops
->ioctl(inode
, file
, cmd
, arg
);
280 EXPORT_SYMBOL_GPL(blkdev_driver_ioctl
);
283 * always keep this in sync with compat_blkdev_ioctl() and
284 * compat_blkdev_locked_ioctl()
286 int blkdev_ioctl(struct inode
*inode
, struct file
*file
, unsigned cmd
,
289 struct block_device
*bdev
= inode
->i_bdev
;
290 struct gendisk
*disk
= bdev
->bd_disk
;
295 if (!capable(CAP_SYS_ADMIN
))
298 ret
= blkdev_driver_ioctl(inode
, file
, disk
, cmd
, arg
);
299 /* -EINVAL to handle old uncorrected drivers */
300 if (ret
!= -EINVAL
&& ret
!= -ENOTTY
)
305 invalidate_bdev(bdev
);
310 ret
= blkdev_driver_ioctl(inode
, file
, disk
, cmd
, arg
);
311 /* -EINVAL to handle old uncorrected drivers */
312 if (ret
!= -EINVAL
&& ret
!= -ENOTTY
)
314 if (!capable(CAP_SYS_ADMIN
))
316 if (get_user(n
, (int __user
*)(arg
)))
319 set_device_ro(bdev
, n
);
326 if (!(file
->f_mode
& FMODE_WRITE
))
329 if (copy_from_user(range
, (void __user
*)arg
, sizeof(range
)))
332 return blk_ioctl_discard(bdev
, range
[0], range
[1]);
336 struct hd_geometry geo
;
340 if (!disk
->fops
->getgeo
)
344 * We need to set the startsect first, the driver may
345 * want to override it.
347 geo
.start
= get_start_sect(bdev
);
348 ret
= disk
->fops
->getgeo(bdev
, &geo
);
351 if (copy_to_user((struct hd_geometry __user
*)arg
, &geo
,
359 ret
= blkdev_locked_ioctl(file
, bdev
, cmd
, arg
);
361 if (ret
!= -ENOIOCTLCMD
)
364 return blkdev_driver_ioctl(inode
, file
, disk
, cmd
, arg
);
366 EXPORT_SYMBOL_GPL(blkdev_ioctl
);