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

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