Root/block/compat_ioctl.c

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/slab.h>
10#include <linux/syscalls.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_uint(unsigned long arg, unsigned int val)
25{
26    return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
27}
28
29static int compat_put_long(unsigned long arg, long val)
30{
31    return put_user(val, (compat_long_t __user *)compat_ptr(arg));
32}
33
34static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
35{
36    return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
37}
38
39static int compat_put_u64(unsigned long arg, u64 val)
40{
41    return put_user(val, (compat_u64 __user *)compat_ptr(arg));
42}
43
44struct compat_hd_geometry {
45    unsigned char heads;
46    unsigned char sectors;
47    unsigned short cylinders;
48    u32 start;
49};
50
51static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
52            struct compat_hd_geometry __user *ugeo)
53{
54    struct hd_geometry geo;
55    int ret;
56
57    if (!ugeo)
58        return -EINVAL;
59    if (!disk->fops->getgeo)
60        return -ENOTTY;
61
62    /*
63     * We need to set the startsect first, the driver may
64     * want to override it.
65     */
66    geo.start = get_start_sect(bdev);
67    ret = disk->fops->getgeo(bdev, &geo);
68    if (ret)
69        return ret;
70
71    ret = copy_to_user(ugeo, &geo, 4);
72    ret |= __put_user(geo.start, &ugeo->start);
73    if (ret)
74        ret = -EFAULT;
75
76    return ret;
77}
78
79static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
80        unsigned int cmd, unsigned long arg)
81{
82    mm_segment_t old_fs = get_fs();
83    unsigned long kval;
84    unsigned int __user *uvp;
85    int error;
86
87    set_fs(KERNEL_DS);
88    error = __blkdev_driver_ioctl(bdev, mode,
89                cmd, (unsigned long)(&kval));
90    set_fs(old_fs);
91
92    if (error == 0) {
93        uvp = compat_ptr(arg);
94        if (put_user(kval, uvp))
95            error = -EFAULT;
96    }
97    return error;
98}
99
100struct compat_cdrom_read_audio {
101    union cdrom_addr addr;
102    u8 addr_format;
103    compat_int_t nframes;
104    compat_caddr_t buf;
105};
106
107struct compat_cdrom_generic_command {
108    unsigned char cmd[CDROM_PACKET_SIZE];
109    compat_caddr_t buffer;
110    compat_uint_t buflen;
111    compat_int_t stat;
112    compat_caddr_t sense;
113    unsigned char data_direction;
114    compat_int_t quiet;
115    compat_int_t timeout;
116    compat_caddr_t reserved[1];
117};
118
119static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
120        unsigned int cmd, unsigned long arg)
121{
122    struct cdrom_read_audio __user *cdread_audio;
123    struct compat_cdrom_read_audio __user *cdread_audio32;
124    __u32 data;
125    void __user *datap;
126
127    cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
128    cdread_audio32 = compat_ptr(arg);
129
130    if (copy_in_user(&cdread_audio->addr,
131             &cdread_audio32->addr,
132             (sizeof(*cdread_audio32) -
133              sizeof(compat_caddr_t))))
134        return -EFAULT;
135
136    if (get_user(data, &cdread_audio32->buf))
137        return -EFAULT;
138    datap = compat_ptr(data);
139    if (put_user(datap, &cdread_audio->buf))
140        return -EFAULT;
141
142    return __blkdev_driver_ioctl(bdev, mode, cmd,
143            (unsigned long)cdread_audio);
144}
145
146static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
147        unsigned int cmd, unsigned long arg)
148{
149    struct cdrom_generic_command __user *cgc;
150    struct compat_cdrom_generic_command __user *cgc32;
151    u32 data;
152    unsigned char dir;
153    int itmp;
154
155    cgc = compat_alloc_user_space(sizeof(*cgc));
156    cgc32 = compat_ptr(arg);
157
158    if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
159        get_user(data, &cgc32->buffer) ||
160        put_user(compat_ptr(data), &cgc->buffer) ||
161        copy_in_user(&cgc->buflen, &cgc32->buflen,
162             (sizeof(unsigned int) + sizeof(int))) ||
163        get_user(data, &cgc32->sense) ||
164        put_user(compat_ptr(data), &cgc->sense) ||
165        get_user(dir, &cgc32->data_direction) ||
166        put_user(dir, &cgc->data_direction) ||
167        get_user(itmp, &cgc32->quiet) ||
168        put_user(itmp, &cgc->quiet) ||
169        get_user(itmp, &cgc32->timeout) ||
170        put_user(itmp, &cgc->timeout) ||
171        get_user(data, &cgc32->reserved[0]) ||
172        put_user(compat_ptr(data), &cgc->reserved[0]))
173        return -EFAULT;
174
175    return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
176}
177
178struct compat_blkpg_ioctl_arg {
179    compat_int_t op;
180    compat_int_t flags;
181    compat_int_t datalen;
182    compat_caddr_t data;
183};
184
185static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
186        unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
187{
188    struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
189    compat_caddr_t udata;
190    compat_int_t n;
191    int err;
192
193    err = get_user(n, &ua32->op);
194    err |= put_user(n, &a->op);
195    err |= get_user(n, &ua32->flags);
196    err |= put_user(n, &a->flags);
197    err |= get_user(n, &ua32->datalen);
198    err |= put_user(n, &a->datalen);
199    err |= get_user(udata, &ua32->data);
200    err |= put_user(compat_ptr(udata), &a->data);
201    if (err)
202        return err;
203
204    return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
205}
206
207#define BLKBSZGET_32 _IOR(0x12, 112, int)
208#define BLKBSZSET_32 _IOW(0x12, 113, int)
209#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
210
211struct compat_floppy_struct {
212    compat_uint_t size;
213    compat_uint_t sect;
214    compat_uint_t head;
215    compat_uint_t track;
216    compat_uint_t stretch;
217    unsigned char gap;
218    unsigned char rate;
219    unsigned char spec1;
220    unsigned char fmt_gap;
221    const compat_caddr_t name;
222};
223
224struct compat_floppy_drive_params {
225    char cmos;
226    compat_ulong_t max_dtr;
227    compat_ulong_t hlt;
228    compat_ulong_t hut;
229    compat_ulong_t srt;
230    compat_ulong_t spinup;
231    compat_ulong_t spindown;
232    unsigned char spindown_offset;
233    unsigned char select_delay;
234    unsigned char rps;
235    unsigned char tracks;
236    compat_ulong_t timeout;
237    unsigned char interleave_sect;
238    struct floppy_max_errors max_errors;
239    char flags;
240    char read_track;
241    short autodetect[8];
242    compat_int_t checkfreq;
243    compat_int_t native_format;
244};
245
246struct compat_floppy_drive_struct {
247    signed char flags;
248    compat_ulong_t spinup_date;
249    compat_ulong_t select_date;
250    compat_ulong_t first_read_date;
251    short probed_format;
252    short track;
253    short maxblock;
254    short maxtrack;
255    compat_int_t generation;
256    compat_int_t keep_data;
257    compat_int_t fd_ref;
258    compat_int_t fd_device;
259    compat_int_t last_checked;
260    compat_caddr_t dmabuf;
261    compat_int_t bufblocks;
262};
263
264struct compat_floppy_fdc_state {
265    compat_int_t spec1;
266    compat_int_t spec2;
267    compat_int_t dtr;
268    unsigned char version;
269    unsigned char dor;
270    compat_ulong_t address;
271    unsigned int rawcmd:2;
272    unsigned int reset:1;
273    unsigned int need_configure:1;
274    unsigned int perp_mode:2;
275    unsigned int has_fifo:1;
276    unsigned int driver_version;
277    unsigned char track[4];
278};
279
280struct compat_floppy_write_errors {
281    unsigned int write_errors;
282    compat_ulong_t first_error_sector;
283    compat_int_t first_error_generation;
284    compat_ulong_t last_error_sector;
285    compat_int_t last_error_generation;
286    compat_uint_t badness;
287};
288
289#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
290#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
291#define FDGETPRM32 _IOR(2, 0x04, struct compat_floppy_struct)
292#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
293#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
294#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
295#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
296#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
297#define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
298
299static struct {
300    unsigned int cmd32;
301    unsigned int cmd;
302} fd_ioctl_trans_table[] = {
303    { FDSETPRM32, FDSETPRM },
304    { FDDEFPRM32, FDDEFPRM },
305    { FDGETPRM32, FDGETPRM },
306    { FDSETDRVPRM32, FDSETDRVPRM },
307    { FDGETDRVPRM32, FDGETDRVPRM },
308    { FDGETDRVSTAT32, FDGETDRVSTAT },
309    { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
310    { FDGETFDCSTAT32, FDGETFDCSTAT },
311    { FDWERRORGET32, FDWERRORGET }
312};
313
314#define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
315
316static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
317        unsigned int cmd, unsigned long arg)
318{
319    mm_segment_t old_fs = get_fs();
320    void *karg = NULL;
321    unsigned int kcmd = 0;
322    int i, err;
323
324    for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
325        if (cmd == fd_ioctl_trans_table[i].cmd32) {
326            kcmd = fd_ioctl_trans_table[i].cmd;
327            break;
328        }
329    if (!kcmd)
330        return -EINVAL;
331
332    switch (cmd) {
333    case FDSETPRM32:
334    case FDDEFPRM32:
335    case FDGETPRM32:
336    {
337        compat_uptr_t name;
338        struct compat_floppy_struct __user *uf;
339        struct floppy_struct *f;
340
341        uf = compat_ptr(arg);
342        f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
343        if (!karg)
344            return -ENOMEM;
345        if (cmd == FDGETPRM32)
346            break;
347        err = __get_user(f->size, &uf->size);
348        err |= __get_user(f->sect, &uf->sect);
349        err |= __get_user(f->head, &uf->head);
350        err |= __get_user(f->track, &uf->track);
351        err |= __get_user(f->stretch, &uf->stretch);
352        err |= __get_user(f->gap, &uf->gap);
353        err |= __get_user(f->rate, &uf->rate);
354        err |= __get_user(f->spec1, &uf->spec1);
355        err |= __get_user(f->fmt_gap, &uf->fmt_gap);
356        err |= __get_user(name, &uf->name);
357        f->name = compat_ptr(name);
358        if (err) {
359            err = -EFAULT;
360            goto out;
361        }
362        break;
363    }
364    case FDSETDRVPRM32:
365    case FDGETDRVPRM32:
366    {
367        struct compat_floppy_drive_params __user *uf;
368        struct floppy_drive_params *f;
369
370        uf = compat_ptr(arg);
371        f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
372        if (!karg)
373            return -ENOMEM;
374        if (cmd == FDGETDRVPRM32)
375            break;
376        err = __get_user(f->cmos, &uf->cmos);
377        err |= __get_user(f->max_dtr, &uf->max_dtr);
378        err |= __get_user(f->hlt, &uf->hlt);
379        err |= __get_user(f->hut, &uf->hut);
380        err |= __get_user(f->srt, &uf->srt);
381        err |= __get_user(f->spinup, &uf->spinup);
382        err |= __get_user(f->spindown, &uf->spindown);
383        err |= __get_user(f->spindown_offset, &uf->spindown_offset);
384        err |= __get_user(f->select_delay, &uf->select_delay);
385        err |= __get_user(f->rps, &uf->rps);
386        err |= __get_user(f->tracks, &uf->tracks);
387        err |= __get_user(f->timeout, &uf->timeout);
388        err |= __get_user(f->interleave_sect, &uf->interleave_sect);
389        err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
390        err |= __get_user(f->flags, &uf->flags);
391        err |= __get_user(f->read_track, &uf->read_track);
392        err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
393        err |= __get_user(f->checkfreq, &uf->checkfreq);
394        err |= __get_user(f->native_format, &uf->native_format);
395        if (err) {
396            err = -EFAULT;
397            goto out;
398        }
399        break;
400    }
401    case FDGETDRVSTAT32:
402    case FDPOLLDRVSTAT32:
403        karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
404        if (!karg)
405            return -ENOMEM;
406        break;
407    case FDGETFDCSTAT32:
408        karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
409        if (!karg)
410            return -ENOMEM;
411        break;
412    case FDWERRORGET32:
413        karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
414        if (!karg)
415            return -ENOMEM;
416        break;
417    default:
418        return -EINVAL;
419    }
420    set_fs(KERNEL_DS);
421    err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
422    set_fs(old_fs);
423    if (err)
424        goto out;
425    switch (cmd) {
426    case FDGETPRM32:
427    {
428        struct floppy_struct *f = karg;
429        struct compat_floppy_struct __user *uf = compat_ptr(arg);
430
431        err = __put_user(f->size, &uf->size);
432        err |= __put_user(f->sect, &uf->sect);
433        err |= __put_user(f->head, &uf->head);
434        err |= __put_user(f->track, &uf->track);
435        err |= __put_user(f->stretch, &uf->stretch);
436        err |= __put_user(f->gap, &uf->gap);
437        err |= __put_user(f->rate, &uf->rate);
438        err |= __put_user(f->spec1, &uf->spec1);
439        err |= __put_user(f->fmt_gap, &uf->fmt_gap);
440        err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
441        break;
442    }
443    case FDGETDRVPRM32:
444    {
445        struct compat_floppy_drive_params __user *uf;
446        struct floppy_drive_params *f = karg;
447
448        uf = compat_ptr(arg);
449        err = __put_user(f->cmos, &uf->cmos);
450        err |= __put_user(f->max_dtr, &uf->max_dtr);
451        err |= __put_user(f->hlt, &uf->hlt);
452        err |= __put_user(f->hut, &uf->hut);
453        err |= __put_user(f->srt, &uf->srt);
454        err |= __put_user(f->spinup, &uf->spinup);
455        err |= __put_user(f->spindown, &uf->spindown);
456        err |= __put_user(f->spindown_offset, &uf->spindown_offset);
457        err |= __put_user(f->select_delay, &uf->select_delay);
458        err |= __put_user(f->rps, &uf->rps);
459        err |= __put_user(f->tracks, &uf->tracks);
460        err |= __put_user(f->timeout, &uf->timeout);
461        err |= __put_user(f->interleave_sect, &uf->interleave_sect);
462        err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
463        err |= __put_user(f->flags, &uf->flags);
464        err |= __put_user(f->read_track, &uf->read_track);
465        err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
466        err |= __put_user(f->checkfreq, &uf->checkfreq);
467        err |= __put_user(f->native_format, &uf->native_format);
468        break;
469    }
470    case FDGETDRVSTAT32:
471    case FDPOLLDRVSTAT32:
472    {
473        struct compat_floppy_drive_struct __user *uf;
474        struct floppy_drive_struct *f = karg;
475
476        uf = compat_ptr(arg);
477        err = __put_user(f->flags, &uf->flags);
478        err |= __put_user(f->spinup_date, &uf->spinup_date);
479        err |= __put_user(f->select_date, &uf->select_date);
480        err |= __put_user(f->first_read_date, &uf->first_read_date);
481        err |= __put_user(f->probed_format, &uf->probed_format);
482        err |= __put_user(f->track, &uf->track);
483        err |= __put_user(f->maxblock, &uf->maxblock);
484        err |= __put_user(f->maxtrack, &uf->maxtrack);
485        err |= __put_user(f->generation, &uf->generation);
486        err |= __put_user(f->keep_data, &uf->keep_data);
487        err |= __put_user(f->fd_ref, &uf->fd_ref);
488        err |= __put_user(f->fd_device, &uf->fd_device);
489        err |= __put_user(f->last_checked, &uf->last_checked);
490        err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
491        err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
492        break;
493    }
494    case FDGETFDCSTAT32:
495    {
496        struct compat_floppy_fdc_state __user *uf;
497        struct floppy_fdc_state *f = karg;
498
499        uf = compat_ptr(arg);
500        err = __put_user(f->spec1, &uf->spec1);
501        err |= __put_user(f->spec2, &uf->spec2);
502        err |= __put_user(f->dtr, &uf->dtr);
503        err |= __put_user(f->version, &uf->version);
504        err |= __put_user(f->dor, &uf->dor);
505        err |= __put_user(f->address, &uf->address);
506        err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
507                   (char *)&f->address + sizeof(f->address), sizeof(int));
508        err |= __put_user(f->driver_version, &uf->driver_version);
509        err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
510        break;
511    }
512    case FDWERRORGET32:
513    {
514        struct compat_floppy_write_errors __user *uf;
515        struct floppy_write_errors *f = karg;
516
517        uf = compat_ptr(arg);
518        err = __put_user(f->write_errors, &uf->write_errors);
519        err |= __put_user(f->first_error_sector, &uf->first_error_sector);
520        err |= __put_user(f->first_error_generation, &uf->first_error_generation);
521        err |= __put_user(f->last_error_sector, &uf->last_error_sector);
522        err |= __put_user(f->last_error_generation, &uf->last_error_generation);
523        err |= __put_user(f->badness, &uf->badness);
524        break;
525    }
526    default:
527        break;
528    }
529    if (err)
530        err = -EFAULT;
531
532out:
533    kfree(karg);
534    return err;
535}
536
537static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
538            unsigned cmd, unsigned long arg)
539{
540    switch (cmd) {
541    case HDIO_GET_UNMASKINTR:
542    case HDIO_GET_MULTCOUNT:
543    case HDIO_GET_KEEPSETTINGS:
544    case HDIO_GET_32BIT:
545    case HDIO_GET_NOWERR:
546    case HDIO_GET_DMA:
547    case HDIO_GET_NICE:
548    case HDIO_GET_WCACHE:
549    case HDIO_GET_ACOUSTIC:
550    case HDIO_GET_ADDRESS:
551    case HDIO_GET_BUSSTATE:
552        return compat_hdio_ioctl(bdev, mode, cmd, arg);
553    case FDSETPRM32:
554    case FDDEFPRM32:
555    case FDGETPRM32:
556    case FDSETDRVPRM32:
557    case FDGETDRVPRM32:
558    case FDGETDRVSTAT32:
559    case FDPOLLDRVSTAT32:
560    case FDGETFDCSTAT32:
561    case FDWERRORGET32:
562        return compat_fd_ioctl(bdev, mode, cmd, arg);
563    case CDROMREADAUDIO:
564        return compat_cdrom_read_audio(bdev, mode, cmd, arg);
565    case CDROM_SEND_PACKET:
566        return compat_cdrom_generic_command(bdev, mode, cmd, arg);
567
568    /*
569     * No handler required for the ones below, we just need to
570     * convert arg to a 64 bit pointer.
571     */
572    case BLKSECTSET:
573    /*
574     * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
575     * Some need translations, these do not.
576     */
577    case HDIO_GET_IDENTITY:
578    case HDIO_DRIVE_TASK:
579    case HDIO_DRIVE_CMD:
580    /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
581    case 0x330:
582    /* 0x02 -- Floppy ioctls */
583    case FDMSGON:
584    case FDMSGOFF:
585    case FDSETEMSGTRESH:
586    case FDFLUSH:
587    case FDWERRORCLR:
588    case FDSETMAXERRS:
589    case FDGETMAXERRS:
590    case FDGETDRVTYP:
591    case FDEJECT:
592    case FDCLRPRM:
593    case FDFMTBEG:
594    case FDFMTEND:
595    case FDRESET:
596    case FDTWADDLE:
597    case FDFMTTRK:
598    case FDRAWCMD:
599    /* CDROM stuff */
600    case CDROMPAUSE:
601    case CDROMRESUME:
602    case CDROMPLAYMSF:
603    case CDROMPLAYTRKIND:
604    case CDROMREADTOCHDR:
605    case CDROMREADTOCENTRY:
606    case CDROMSTOP:
607    case CDROMSTART:
608    case CDROMEJECT:
609    case CDROMVOLCTRL:
610    case CDROMSUBCHNL:
611    case CDROMMULTISESSION:
612    case CDROM_GET_MCN:
613    case CDROMRESET:
614    case CDROMVOLREAD:
615    case CDROMSEEK:
616    case CDROMPLAYBLK:
617    case CDROMCLOSETRAY:
618    case CDROM_DISC_STATUS:
619    case CDROM_CHANGER_NSLOTS:
620    case CDROM_GET_CAPABILITY:
621    /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
622     * not take a struct cdrom_read, instead they take a struct cdrom_msf
623     * which is compatible.
624     */
625    case CDROMREADMODE2:
626    case CDROMREADMODE1:
627    case CDROMREADRAW:
628    case CDROMREADCOOKED:
629    case CDROMREADALL:
630    /* DVD ioctls */
631    case DVD_READ_STRUCT:
632    case DVD_WRITE_STRUCT:
633    case DVD_AUTH:
634        arg = (unsigned long)compat_ptr(arg);
635    /* These intepret arg as an unsigned long, not as a pointer,
636     * so we must not do compat_ptr() conversion. */
637    case HDIO_SET_MULTCOUNT:
638    case HDIO_SET_UNMASKINTR:
639    case HDIO_SET_KEEPSETTINGS:
640    case HDIO_SET_32BIT:
641    case HDIO_SET_NOWERR:
642    case HDIO_SET_DMA:
643    case HDIO_SET_PIO_MODE:
644    case HDIO_SET_NICE:
645    case HDIO_SET_WCACHE:
646    case HDIO_SET_ACOUSTIC:
647    case HDIO_SET_BUSSTATE:
648    case HDIO_SET_ADDRESS:
649    case CDROMEJECT_SW:
650    case CDROM_SET_OPTIONS:
651    case CDROM_CLEAR_OPTIONS:
652    case CDROM_SELECT_SPEED:
653    case CDROM_SELECT_DISC:
654    case CDROM_MEDIA_CHANGED:
655    case CDROM_DRIVE_STATUS:
656    case CDROM_LOCKDOOR:
657    case CDROM_DEBUG:
658        break;
659    default:
660        /* unknown ioctl number */
661        return -ENOIOCTLCMD;
662    }
663
664    return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
665}
666
667/* Most of the generic ioctls are handled in the normal fallback path.
668   This assumes the blkdev's low level compat_ioctl always returns
669   ENOIOCTLCMD for unknown ioctls. */
670long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
671{
672    int ret = -ENOIOCTLCMD;
673    struct inode *inode = file->f_mapping->host;
674    struct block_device *bdev = inode->i_bdev;
675    struct gendisk *disk = bdev->bd_disk;
676    fmode_t mode = file->f_mode;
677    struct backing_dev_info *bdi;
678    loff_t size;
679
680    /*
681     * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
682     * to updated it before every ioctl.
683     */
684    if (file->f_flags & O_NDELAY)
685        mode |= FMODE_NDELAY;
686    else
687        mode &= ~FMODE_NDELAY;
688
689    switch (cmd) {
690    case HDIO_GETGEO:
691        return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
692    case BLKPBSZGET:
693        return compat_put_uint(arg, bdev_physical_block_size(bdev));
694    case BLKIOMIN:
695        return compat_put_uint(arg, bdev_io_min(bdev));
696    case BLKIOOPT:
697        return compat_put_uint(arg, bdev_io_opt(bdev));
698    case BLKALIGNOFF:
699        return compat_put_int(arg, bdev_alignment_offset(bdev));
700    case BLKDISCARDZEROES:
701        return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
702    case BLKFLSBUF:
703    case BLKROSET:
704    case BLKDISCARD:
705    case BLKSECDISCARD:
706    /*
707     * the ones below are implemented in blkdev_locked_ioctl,
708     * but we call blkdev_ioctl, which gets the lock for us
709     */
710    case BLKRRPART:
711        return blkdev_ioctl(bdev, mode, cmd,
712                (unsigned long)compat_ptr(arg));
713    case BLKBSZSET_32:
714        return blkdev_ioctl(bdev, mode, BLKBSZSET,
715                (unsigned long)compat_ptr(arg));
716    case BLKPG:
717        return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
718    case BLKRAGET:
719    case BLKFRAGET:
720        if (!arg)
721            return -EINVAL;
722        bdi = blk_get_backing_dev_info(bdev);
723        if (bdi == NULL)
724            return -ENOTTY;
725        return compat_put_long(arg,
726                       (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
727    case BLKROGET: /* compatible */
728        return compat_put_int(arg, bdev_read_only(bdev) != 0);
729    case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
730        return compat_put_int(arg, block_size(bdev));
731    case BLKSSZGET: /* get block device hardware sector size */
732        return compat_put_int(arg, bdev_logical_block_size(bdev));
733    case BLKSECTGET:
734        return compat_put_ushort(arg,
735                     queue_max_sectors(bdev_get_queue(bdev)));
736    case BLKRASET: /* compatible, but no compat_ptr (!) */
737    case BLKFRASET:
738        if (!capable(CAP_SYS_ADMIN))
739            return -EACCES;
740        bdi = blk_get_backing_dev_info(bdev);
741        if (bdi == NULL)
742            return -ENOTTY;
743        bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
744        return 0;
745    case BLKGETSIZE:
746        size = i_size_read(bdev->bd_inode);
747        if ((size >> 9) > ~0UL)
748            return -EFBIG;
749        return compat_put_ulong(arg, size >> 9);
750
751    case BLKGETSIZE64_32:
752        return compat_put_u64(arg, i_size_read(bdev->bd_inode));
753
754    case BLKTRACESETUP32:
755    case BLKTRACESTART: /* compatible */
756    case BLKTRACESTOP: /* compatible */
757    case BLKTRACETEARDOWN: /* compatible */
758        ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
759        return ret;
760    default:
761        if (disk->fops->compat_ioctl)
762            ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
763        if (ret == -ENOIOCTLCMD)
764            ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
765        return ret;
766    }
767}
768

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