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gerrit-public.fairphone.software / kernel / msm-4.9 / 7199d4cdd8485f802df3e1bc131245c69009b9a4 / . / block / compat_ioctl.c
blob: 500cc9e761c1040aa0c5e035592e4eb3eaa03b57 [file] [log] [blame]
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200[diff] [blame]1#include <linux/blkdev.h>
2#include <linux/blkpg.h>
3#include <linux/blktrace_api.h>
4#include <linux/cdrom.h>
5#include <linux/compat.h>
6#include <linux/elevator.h>
7#include <linux/fd.h>
8#include <linux/hdreg.h>
9#include <linux/syscalls.h>
10#include <linux/smp_lock.h>
11#include <linux/types.h>
12#include <linux/uaccess.h>
13
14static int compat_put_ushort(unsigned long arg, unsigned short val)
15{
16 return put_user(val, (unsigned short __user *)compat_ptr(arg));
17}
18
19static int compat_put_int(unsigned long arg, int val)
20{
21 return put_user(val, (compat_int_t __user *)compat_ptr(arg));
22}
23
24static int compat_put_long(unsigned long arg, long val)
25{
26 return put_user(val, (compat_long_t __user *)compat_ptr(arg));
27}
28
29static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
30{
31 return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
32}
33
34static int compat_put_u64(unsigned long arg, u64 val)
35{
36 return put_user(val, (compat_u64 __user *)compat_ptr(arg));
37}
38
39#define BLKBSZGET_32 _IOR(0x12, 112, int)
40#define BLKBSZSET_32 _IOW(0x12, 113, int)
41#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
42
Arnd Bergmann7199d4c2007-10-09 13:23:52 +0200[diff] [blame^]43static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
44 struct gendisk *disk, unsigned cmd, unsigned long arg)
45{
46 int ret;
47
48 switch (arg) {
49 /*
50 * No handler required for the ones below, we just need to
51 * convert arg to a 64 bit pointer.
52 */
53 case BLKSECTSET:
54 /*
55 * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
56 * Some need translations, these do not.
57 */
58 case HDIO_GET_IDENTITY:
59 case HDIO_DRIVE_TASK:
60 case HDIO_DRIVE_CMD:
61 case HDIO_SCAN_HWIF:
62 /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
63 case 0x330:
64 /* 0x02 -- Floppy ioctls */
65 case FDMSGON:
66 case FDMSGOFF:
67 case FDSETEMSGTRESH:
68 case FDFLUSH:
69 case FDWERRORCLR:
70 case FDSETMAXERRS:
71 case FDGETMAXERRS:
72 case FDGETDRVTYP:
73 case FDEJECT:
74 case FDCLRPRM:
75 case FDFMTBEG:
76 case FDFMTEND:
77 case FDRESET:
78 case FDTWADDLE:
79 case FDFMTTRK:
80 case FDRAWCMD:
81 /* CDROM stuff */
82 case CDROMPAUSE:
83 case CDROMRESUME:
84 case CDROMPLAYMSF:
85 case CDROMPLAYTRKIND:
86 case CDROMREADTOCHDR:
87 case CDROMREADTOCENTRY:
88 case CDROMSTOP:
89 case CDROMSTART:
90 case CDROMEJECT:
91 case CDROMVOLCTRL:
92 case CDROMSUBCHNL:
93 case CDROMMULTISESSION:
94 case CDROM_GET_MCN:
95 case CDROMRESET:
96 case CDROMVOLREAD:
97 case CDROMSEEK:
98 case CDROMPLAYBLK:
99 case CDROMCLOSETRAY:
100 case CDROM_DISC_STATUS:
101 case CDROM_CHANGER_NSLOTS:
102 case CDROM_GET_CAPABILITY:
103 /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
104 * not take a struct cdrom_read, instead they take a struct cdrom_msf
105 * which is compatible.
106 */
107 case CDROMREADMODE2:
108 case CDROMREADMODE1:
109 case CDROMREADRAW:
110 case CDROMREADCOOKED:
111 case CDROMREADALL:
112 /* DVD ioctls */
113 case DVD_READ_STRUCT:
114 case DVD_WRITE_STRUCT:
115 case DVD_AUTH:
116 arg = (unsigned long)compat_ptr(arg);
117 /* These intepret arg as an unsigned long, not as a pointer,
118 * so we must not do compat_ptr() conversion. */
119 case HDIO_SET_MULTCOUNT:
120 case HDIO_SET_UNMASKINTR:
121 case HDIO_SET_KEEPSETTINGS:
122 case HDIO_SET_32BIT:
123 case HDIO_SET_NOWERR:
124 case HDIO_SET_DMA:
125 case HDIO_SET_PIO_MODE:
126 case HDIO_SET_NICE:
127 case HDIO_SET_WCACHE:
128 case HDIO_SET_ACOUSTIC:
129 case HDIO_SET_BUSSTATE:
130 case HDIO_SET_ADDRESS:
131 case CDROMEJECT_SW:
132 case CDROM_SET_OPTIONS:
133 case CDROM_CLEAR_OPTIONS:
134 case CDROM_SELECT_SPEED:
135 case CDROM_SELECT_DISC:
136 case CDROM_MEDIA_CHANGED:
137 case CDROM_DRIVE_STATUS:
138 case CDROM_LOCKDOOR:
139 case CDROM_DEBUG:
140 break;
141 default:
142 /* unknown ioctl number */
143 return -ENOIOCTLCMD;
144 }
145
146 if (disk->fops->unlocked_ioctl)
147 return disk->fops->unlocked_ioctl(file, cmd, arg);
148
149 if (disk->fops->ioctl) {
150 lock_kernel();
151 ret = disk->fops->ioctl(inode, file, cmd, arg);
152 unlock_kernel();
153 return ret;
154 }
155
156 return -ENOTTY;
157}
158
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200[diff] [blame]159static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
160 struct block_device *bdev,
161 unsigned cmd, unsigned long arg)
162{
163 struct backing_dev_info *bdi;
164
165 switch (cmd) {
166 case BLKRAGET:
167 case BLKFRAGET:
168 if (!arg)
169 return -EINVAL;
170 bdi = blk_get_backing_dev_info(bdev);
171 if (bdi == NULL)
172 return -ENOTTY;
173 return compat_put_long(arg,
174 (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
175 case BLKROGET: /* compatible */
176 return compat_put_int(arg, bdev_read_only(bdev) != 0);
177 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
178 return compat_put_int(arg, block_size(bdev));
179 case BLKSSZGET: /* get block device hardware sector size */
180 return compat_put_int(arg, bdev_hardsect_size(bdev));
181 case BLKSECTGET:
182 return compat_put_ushort(arg,
183 bdev_get_queue(bdev)->max_sectors);
184 case BLKRASET: /* compatible, but no compat_ptr (!) */
185 case BLKFRASET:
186 if (!capable(CAP_SYS_ADMIN))
187 return -EACCES;
188 bdi = blk_get_backing_dev_info(bdev);
189 if (bdi == NULL)
190 return -ENOTTY;
191 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
192 return 0;
193 case BLKGETSIZE:
194 if ((bdev->bd_inode->i_size >> 9) > ~0UL)
195 return -EFBIG;
196 return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
197
198 case BLKGETSIZE64_32:
199 return compat_put_u64(arg, bdev->bd_inode->i_size);
200 }
201 return -ENOIOCTLCMD;
202}
203
204/* Most of the generic ioctls are handled in the normal fallback path.
205 This assumes the blkdev's low level compat_ioctl always returns
206 ENOIOCTLCMD for unknown ioctls. */
207long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
208{
209 int ret = -ENOIOCTLCMD;
210 struct inode *inode = file->f_mapping->host;
211 struct block_device *bdev = inode->i_bdev;
212 struct gendisk *disk = bdev->bd_disk;
213
214 switch (cmd) {
215 case BLKFLSBUF:
216 case BLKROSET:
217 /*
218 * the ones below are implemented in blkdev_locked_ioctl,
219 * but we call blkdev_ioctl, which gets the lock for us
220 */
221 case BLKRRPART:
222 return blkdev_ioctl(inode, file, cmd,
223 (unsigned long)compat_ptr(arg));
224 case BLKBSZSET_32:
225 return blkdev_ioctl(inode, file, BLKBSZSET,
226 (unsigned long)compat_ptr(arg));
227 }
228
229 lock_kernel();
230 ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
231 /* FIXME: why do we assume -> compat_ioctl needs the BKL? */
232 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
233 ret = disk->fops->compat_ioctl(file, cmd, arg);
234 unlock_kernel();
235
Arnd Bergmann7199d4c2007-10-09 13:23:52 +0200[diff] [blame^]236 if (ret != -ENOIOCTLCMD)
237 return ret;
238
239 return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);
Arnd Bergmannf58c4c02007-10-09 13:23:51 +0200[diff] [blame]240}