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_drive_params {
212    char cmos;
213    compat_ulong_t max_dtr;
214    compat_ulong_t hlt;
215    compat_ulong_t hut;
216    compat_ulong_t srt;
217    compat_ulong_t spinup;
218    compat_ulong_t spindown;
219    unsigned char spindown_offset;
220    unsigned char select_delay;
221    unsigned char rps;
222    unsigned char tracks;
223    compat_ulong_t timeout;
224    unsigned char interleave_sect;
225    struct floppy_max_errors max_errors;
226    char flags;
227    char read_track;
228    short autodetect[8];
229    compat_int_t checkfreq;
230    compat_int_t native_format;
231};
232
233struct compat_floppy_drive_struct {
234    signed char flags;
235    compat_ulong_t spinup_date;
236    compat_ulong_t select_date;
237    compat_ulong_t first_read_date;
238    short probed_format;
239    short track;
240    short maxblock;
241    short maxtrack;
242    compat_int_t generation;
243    compat_int_t keep_data;
244    compat_int_t fd_ref;
245    compat_int_t fd_device;
246    compat_int_t last_checked;
247    compat_caddr_t dmabuf;
248    compat_int_t bufblocks;
249};
250
251struct compat_floppy_fdc_state {
252    compat_int_t spec1;
253    compat_int_t spec2;
254    compat_int_t dtr;
255    unsigned char version;
256    unsigned char dor;
257    compat_ulong_t address;
258    unsigned int rawcmd:2;
259    unsigned int reset:1;
260    unsigned int need_configure:1;
261    unsigned int perp_mode:2;
262    unsigned int has_fifo:1;
263    unsigned int driver_version;
264    unsigned char track[4];
265};
266
267struct compat_floppy_write_errors {
268    unsigned int write_errors;
269    compat_ulong_t first_error_sector;
270    compat_int_t first_error_generation;
271    compat_ulong_t last_error_sector;
272    compat_int_t last_error_generation;
273    compat_uint_t badness;
274};
275
276#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
277#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
278#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
279#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
280#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
281#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
282#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
283#define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
284
285static struct {
286    unsigned int cmd32;
287    unsigned int cmd;
288} fd_ioctl_trans_table[] = {
289    { FDSETPRM32, FDSETPRM },
290    { FDDEFPRM32, FDDEFPRM },
291    { FDGETPRM32, FDGETPRM },
292    { FDSETDRVPRM32, FDSETDRVPRM },
293    { FDGETDRVPRM32, FDGETDRVPRM },
294    { FDGETDRVSTAT32, FDGETDRVSTAT },
295    { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
296    { FDGETFDCSTAT32, FDGETFDCSTAT },
297    { FDWERRORGET32, FDWERRORGET }
298};
299
300#define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
301
302static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
303        unsigned int cmd, unsigned long arg)
304{
305    mm_segment_t old_fs = get_fs();
306    void *karg = NULL;
307    unsigned int kcmd = 0;
308    int i, err;
309
310    for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
311        if (cmd == fd_ioctl_trans_table[i].cmd32) {
312            kcmd = fd_ioctl_trans_table[i].cmd;
313            break;
314        }
315    if (!kcmd)
316        return -EINVAL;
317
318    switch (cmd) {
319    case FDSETPRM32:
320    case FDDEFPRM32:
321    case FDGETPRM32:
322    {
323        compat_uptr_t name;
324        struct compat_floppy_struct __user *uf;
325        struct floppy_struct *f;
326
327        uf = compat_ptr(arg);
328        f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
329        if (!karg)
330            return -ENOMEM;
331        if (cmd == FDGETPRM32)
332            break;
333        err = __get_user(f->size, &uf->size);
334        err |= __get_user(f->sect, &uf->sect);
335        err |= __get_user(f->head, &uf->head);
336        err |= __get_user(f->track, &uf->track);
337        err |= __get_user(f->stretch, &uf->stretch);
338        err |= __get_user(f->gap, &uf->gap);
339        err |= __get_user(f->rate, &uf->rate);
340        err |= __get_user(f->spec1, &uf->spec1);
341        err |= __get_user(f->fmt_gap, &uf->fmt_gap);
342        err |= __get_user(name, &uf->name);
343        f->name = compat_ptr(name);
344        if (err) {
345            err = -EFAULT;
346            goto out;
347        }
348        break;
349    }
350    case FDSETDRVPRM32:
351    case FDGETDRVPRM32:
352    {
353        struct compat_floppy_drive_params __user *uf;
354        struct floppy_drive_params *f;
355
356        uf = compat_ptr(arg);
357        f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
358        if (!karg)
359            return -ENOMEM;
360        if (cmd == FDGETDRVPRM32)
361            break;
362        err = __get_user(f->cmos, &uf->cmos);
363        err |= __get_user(f->max_dtr, &uf->max_dtr);
364        err |= __get_user(f->hlt, &uf->hlt);
365        err |= __get_user(f->hut, &uf->hut);
366        err |= __get_user(f->srt, &uf->srt);
367        err |= __get_user(f->spinup, &uf->spinup);
368        err |= __get_user(f->spindown, &uf->spindown);
369        err |= __get_user(f->spindown_offset, &uf->spindown_offset);
370        err |= __get_user(f->select_delay, &uf->select_delay);
371        err |= __get_user(f->rps, &uf->rps);
372        err |= __get_user(f->tracks, &uf->tracks);
373        err |= __get_user(f->timeout, &uf->timeout);
374        err |= __get_user(f->interleave_sect, &uf->interleave_sect);
375        err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
376        err |= __get_user(f->flags, &uf->flags);
377        err |= __get_user(f->read_track, &uf->read_track);
378        err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
379        err |= __get_user(f->checkfreq, &uf->checkfreq);
380        err |= __get_user(f->native_format, &uf->native_format);
381        if (err) {
382            err = -EFAULT;
383            goto out;
384        }
385        break;
386    }
387    case FDGETDRVSTAT32:
388    case FDPOLLDRVSTAT32:
389        karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
390        if (!karg)
391            return -ENOMEM;
392        break;
393    case FDGETFDCSTAT32:
394        karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
395        if (!karg)
396            return -ENOMEM;
397        break;
398    case FDWERRORGET32:
399        karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
400        if (!karg)
401            return -ENOMEM;
402        break;
403    default:
404        return -EINVAL;
405    }
406    set_fs(KERNEL_DS);
407    err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
408    set_fs(old_fs);
409    if (err)
410        goto out;
411    switch (cmd) {
412    case FDGETPRM32:
413    {
414        struct floppy_struct *f = karg;
415        struct compat_floppy_struct __user *uf = compat_ptr(arg);
416
417        err = __put_user(f->size, &uf->size);
418        err |= __put_user(f->sect, &uf->sect);
419        err |= __put_user(f->head, &uf->head);
420        err |= __put_user(f->track, &uf->track);
421        err |= __put_user(f->stretch, &uf->stretch);
422        err |= __put_user(f->gap, &uf->gap);
423        err |= __put_user(f->rate, &uf->rate);
424        err |= __put_user(f->spec1, &uf->spec1);
425        err |= __put_user(f->fmt_gap, &uf->fmt_gap);
426        err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
427        break;
428    }
429    case FDGETDRVPRM32:
430    {
431        struct compat_floppy_drive_params __user *uf;
432        struct floppy_drive_params *f = karg;
433
434        uf = compat_ptr(arg);
435        err = __put_user(f->cmos, &uf->cmos);
436        err |= __put_user(f->max_dtr, &uf->max_dtr);
437        err |= __put_user(f->hlt, &uf->hlt);
438        err |= __put_user(f->hut, &uf->hut);
439        err |= __put_user(f->srt, &uf->srt);
440        err |= __put_user(f->spinup, &uf->spinup);
441        err |= __put_user(f->spindown, &uf->spindown);
442        err |= __put_user(f->spindown_offset, &uf->spindown_offset);
443        err |= __put_user(f->select_delay, &uf->select_delay);
444        err |= __put_user(f->rps, &uf->rps);
445        err |= __put_user(f->tracks, &uf->tracks);
446        err |= __put_user(f->timeout, &uf->timeout);
447        err |= __put_user(f->interleave_sect, &uf->interleave_sect);
448        err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
449        err |= __put_user(f->flags, &uf->flags);
450        err |= __put_user(f->read_track, &uf->read_track);
451        err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
452        err |= __put_user(f->checkfreq, &uf->checkfreq);
453        err |= __put_user(f->native_format, &uf->native_format);
454        break;
455    }
456    case FDGETDRVSTAT32:
457    case FDPOLLDRVSTAT32:
458    {
459        struct compat_floppy_drive_struct __user *uf;
460        struct floppy_drive_struct *f = karg;
461
462        uf = compat_ptr(arg);
463        err = __put_user(f->flags, &uf->flags);
464        err |= __put_user(f->spinup_date, &uf->spinup_date);
465        err |= __put_user(f->select_date, &uf->select_date);
466        err |= __put_user(f->first_read_date, &uf->first_read_date);
467        err |= __put_user(f->probed_format, &uf->probed_format);
468        err |= __put_user(f->track, &uf->track);
469        err |= __put_user(f->maxblock, &uf->maxblock);
470        err |= __put_user(f->maxtrack, &uf->maxtrack);
471        err |= __put_user(f->generation, &uf->generation);
472        err |= __put_user(f->keep_data, &uf->keep_data);
473        err |= __put_user(f->fd_ref, &uf->fd_ref);
474        err |= __put_user(f->fd_device, &uf->fd_device);
475        err |= __put_user(f->last_checked, &uf->last_checked);
476        err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
477        err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
478        break;
479    }
480    case FDGETFDCSTAT32:
481    {
482        struct compat_floppy_fdc_state __user *uf;
483        struct floppy_fdc_state *f = karg;
484
485        uf = compat_ptr(arg);
486        err = __put_user(f->spec1, &uf->spec1);
487        err |= __put_user(f->spec2, &uf->spec2);
488        err |= __put_user(f->dtr, &uf->dtr);
489        err |= __put_user(f->version, &uf->version);
490        err |= __put_user(f->dor, &uf->dor);
491        err |= __put_user(f->address, &uf->address);
492        err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
493                   (char *)&f->address + sizeof(f->address), sizeof(int));
494        err |= __put_user(f->driver_version, &uf->driver_version);
495        err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
496        break;
497    }
498    case FDWERRORGET32:
499    {
500        struct compat_floppy_write_errors __user *uf;
501        struct floppy_write_errors *f = karg;
502
503        uf = compat_ptr(arg);
504        err = __put_user(f->write_errors, &uf->write_errors);
505        err |= __put_user(f->first_error_sector, &uf->first_error_sector);
506        err |= __put_user(f->first_error_generation, &uf->first_error_generation);
507        err |= __put_user(f->last_error_sector, &uf->last_error_sector);
508        err |= __put_user(f->last_error_generation, &uf->last_error_generation);
509        err |= __put_user(f->badness, &uf->badness);
510        break;
511    }
512    default:
513        break;
514    }
515    if (err)
516        err = -EFAULT;
517
518out:
519    kfree(karg);
520    return err;
521}
522
523static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
524            unsigned cmd, unsigned long arg)
525{
526    switch (cmd) {
527    case HDIO_GET_UNMASKINTR:
528    case HDIO_GET_MULTCOUNT:
529    case HDIO_GET_KEEPSETTINGS:
530    case HDIO_GET_32BIT:
531    case HDIO_GET_NOWERR:
532    case HDIO_GET_DMA:
533    case HDIO_GET_NICE:
534    case HDIO_GET_WCACHE:
535    case HDIO_GET_ACOUSTIC:
536    case HDIO_GET_ADDRESS:
537    case HDIO_GET_BUSSTATE:
538        return compat_hdio_ioctl(bdev, mode, cmd, arg);
539    case FDSETPRM32:
540    case FDDEFPRM32:
541    case FDGETPRM32:
542    case FDSETDRVPRM32:
543    case FDGETDRVPRM32:
544    case FDGETDRVSTAT32:
545    case FDPOLLDRVSTAT32:
546    case FDGETFDCSTAT32:
547    case FDWERRORGET32:
548        return compat_fd_ioctl(bdev, mode, cmd, arg);
549    case CDROMREADAUDIO:
550        return compat_cdrom_read_audio(bdev, mode, cmd, arg);
551    case CDROM_SEND_PACKET:
552        return compat_cdrom_generic_command(bdev, mode, cmd, arg);
553
554    /*
555     * No handler required for the ones below, we just need to
556     * convert arg to a 64 bit pointer.
557     */
558    case BLKSECTSET:
559    /*
560     * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
561     * Some need translations, these do not.
562     */
563    case HDIO_GET_IDENTITY:
564    case HDIO_DRIVE_TASK:
565    case HDIO_DRIVE_CMD:
566    /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
567    case 0x330:
568    /* 0x02 -- Floppy ioctls */
569    case FDMSGON:
570    case FDMSGOFF:
571    case FDSETEMSGTRESH:
572    case FDFLUSH:
573    case FDWERRORCLR:
574    case FDSETMAXERRS:
575    case FDGETMAXERRS:
576    case FDGETDRVTYP:
577    case FDEJECT:
578    case FDCLRPRM:
579    case FDFMTBEG:
580    case FDFMTEND:
581    case FDRESET:
582    case FDTWADDLE:
583    case FDFMTTRK:
584    case FDRAWCMD:
585    /* CDROM stuff */
586    case CDROMPAUSE:
587    case CDROMRESUME:
588    case CDROMPLAYMSF:
589    case CDROMPLAYTRKIND:
590    case CDROMREADTOCHDR:
591    case CDROMREADTOCENTRY:
592    case CDROMSTOP:
593    case CDROMSTART:
594    case CDROMEJECT:
595    case CDROMVOLCTRL:
596    case CDROMSUBCHNL:
597    case CDROMMULTISESSION:
598    case CDROM_GET_MCN:
599    case CDROMRESET:
600    case CDROMVOLREAD:
601    case CDROMSEEK:
602    case CDROMPLAYBLK:
603    case CDROMCLOSETRAY:
604    case CDROM_DISC_STATUS:
605    case CDROM_CHANGER_NSLOTS:
606    case CDROM_GET_CAPABILITY:
607    /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
608     * not take a struct cdrom_read, instead they take a struct cdrom_msf
609     * which is compatible.
610     */
611    case CDROMREADMODE2:
612    case CDROMREADMODE1:
613    case CDROMREADRAW:
614    case CDROMREADCOOKED:
615    case CDROMREADALL:
616    /* DVD ioctls */
617    case DVD_READ_STRUCT:
618    case DVD_WRITE_STRUCT:
619    case DVD_AUTH:
620        arg = (unsigned long)compat_ptr(arg);
621    /* These intepret arg as an unsigned long, not as a pointer,
622     * so we must not do compat_ptr() conversion. */
623    case HDIO_SET_MULTCOUNT:
624    case HDIO_SET_UNMASKINTR:
625    case HDIO_SET_KEEPSETTINGS:
626    case HDIO_SET_32BIT:
627    case HDIO_SET_NOWERR:
628    case HDIO_SET_DMA:
629    case HDIO_SET_PIO_MODE:
630    case HDIO_SET_NICE:
631    case HDIO_SET_WCACHE:
632    case HDIO_SET_ACOUSTIC:
633    case HDIO_SET_BUSSTATE:
634    case HDIO_SET_ADDRESS:
635    case CDROMEJECT_SW:
636    case CDROM_SET_OPTIONS:
637    case CDROM_CLEAR_OPTIONS:
638    case CDROM_SELECT_SPEED:
639    case CDROM_SELECT_DISC:
640    case CDROM_MEDIA_CHANGED:
641    case CDROM_DRIVE_STATUS:
642    case CDROM_LOCKDOOR:
643    case CDROM_DEBUG:
644        break;
645    default:
646        /* unknown ioctl number */
647        return -ENOIOCTLCMD;
648    }
649
650    return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
651}
652
653/* Most of the generic ioctls are handled in the normal fallback path.
654   This assumes the blkdev's low level compat_ioctl always returns
655   ENOIOCTLCMD for unknown ioctls. */
656long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
657{
658    int ret = -ENOIOCTLCMD;
659    struct inode *inode = file->f_mapping->host;
660    struct block_device *bdev = inode->i_bdev;
661    struct gendisk *disk = bdev->bd_disk;
662    fmode_t mode = file->f_mode;
663    struct backing_dev_info *bdi;
664    loff_t size;
665
666    /*
667     * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
668     * to updated it before every ioctl.
669     */
670    if (file->f_flags & O_NDELAY)
671        mode |= FMODE_NDELAY;
672    else
673        mode &= ~FMODE_NDELAY;
674
675    switch (cmd) {
676    case HDIO_GETGEO:
677        return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
678    case BLKPBSZGET:
679        return compat_put_uint(arg, bdev_physical_block_size(bdev));
680    case BLKIOMIN:
681        return compat_put_uint(arg, bdev_io_min(bdev));
682    case BLKIOOPT:
683        return compat_put_uint(arg, bdev_io_opt(bdev));
684    case BLKALIGNOFF:
685        return compat_put_int(arg, bdev_alignment_offset(bdev));
686    case BLKDISCARDZEROES:
687        return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
688    case BLKFLSBUF:
689    case BLKROSET:
690    case BLKDISCARD:
691    case BLKSECDISCARD:
692    /*
693     * the ones below are implemented in blkdev_locked_ioctl,
694     * but we call blkdev_ioctl, which gets the lock for us
695     */
696    case BLKRRPART:
697        return blkdev_ioctl(bdev, mode, cmd,
698                (unsigned long)compat_ptr(arg));
699    case BLKBSZSET_32:
700        return blkdev_ioctl(bdev, mode, BLKBSZSET,
701                (unsigned long)compat_ptr(arg));
702    case BLKPG:
703        return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
704    case BLKRAGET:
705    case BLKFRAGET:
706        if (!arg)
707            return -EINVAL;
708        bdi = blk_get_backing_dev_info(bdev);
709        if (bdi == NULL)
710            return -ENOTTY;
711        return compat_put_long(arg,
712                       (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
713    case BLKROGET: /* compatible */
714        return compat_put_int(arg, bdev_read_only(bdev) != 0);
715    case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
716        return compat_put_int(arg, block_size(bdev));
717    case BLKSSZGET: /* get block device hardware sector size */
718        return compat_put_int(arg, bdev_logical_block_size(bdev));
719    case BLKSECTGET:
720        return compat_put_ushort(arg,
721                     queue_max_sectors(bdev_get_queue(bdev)));
722    case BLKROTATIONAL:
723        return compat_put_ushort(arg,
724                     !blk_queue_nonrot(bdev_get_queue(bdev)));
725    case BLKRASET: /* compatible, but no compat_ptr (!) */
726    case BLKFRASET:
727        if (!capable(CAP_SYS_ADMIN))
728            return -EACCES;
729        bdi = blk_get_backing_dev_info(bdev);
730        if (bdi == NULL)
731            return -ENOTTY;
732        bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
733        return 0;
734    case BLKGETSIZE:
735        size = i_size_read(bdev->bd_inode);
736        if ((size >> 9) > ~0UL)
737            return -EFBIG;
738        return compat_put_ulong(arg, size >> 9);
739
740    case BLKGETSIZE64_32:
741        return compat_put_u64(arg, i_size_read(bdev->bd_inode));
742
743    case BLKTRACESETUP32:
744    case BLKTRACESTART: /* compatible */
745    case BLKTRACESTOP: /* compatible */
746    case BLKTRACETEARDOWN: /* compatible */
747        ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
748        return ret;
749    default:
750        if (disk->fops->compat_ioctl)
751            ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
752        if (ret == -ENOIOCTLCMD)
753            ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
754        return ret;
755    }
756}
757

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