File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
new file mode 100644
index 0000000..f678c73
--- /dev/null
+++ b/block/compat_ioctl.c
@@ -0,0 +1,756 @@
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/blktrace_api.h>
+#include <linux/cdrom.h>
+#include <linux/compat.h>
+#include <linux/elevator.h>
+#include <linux/fd.h>
+#include <linux/hdreg.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+static int compat_put_ushort(unsigned long arg, unsigned short val)
+{
+ return put_user(val, (unsigned short __user *)compat_ptr(arg));
+}
+
+static int compat_put_int(unsigned long arg, int val)
+{
+ return put_user(val, (compat_int_t __user *)compat_ptr(arg));
+}
+
+static int compat_put_uint(unsigned long arg, unsigned int val)
+{
+ return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
+}
+
+static int compat_put_long(unsigned long arg, long val)
+{
+ return put_user(val, (compat_long_t __user *)compat_ptr(arg));
+}
+
+static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
+{
+ return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
+}
+
+static int compat_put_u64(unsigned long arg, u64 val)
+{
+ return put_user(val, (compat_u64 __user *)compat_ptr(arg));
+}
+
+struct compat_hd_geometry {
+ unsigned char heads;
+ unsigned char sectors;
+ unsigned short cylinders;
+ u32 start;
+};
+
+static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
+ struct compat_hd_geometry __user *ugeo)
+{
+ struct hd_geometry geo;
+ int ret;
+
+ if (!ugeo)
+ return -EINVAL;
+ if (!disk->fops->getgeo)
+ return -ENOTTY;
+
+ memset(&geo, 0, sizeof(geo));
+ /*
+ * We need to set the startsect first, the driver may
+ * want to override it.
+ */
+ geo.start = get_start_sect(bdev);
+ ret = disk->fops->getgeo(bdev, &geo);
+ if (ret)
+ return ret;
+
+ ret = copy_to_user(ugeo, &geo, 4);
+ ret |= put_user(geo.start, &ugeo->start);
+ if (ret)
+ ret = -EFAULT;
+
+ return ret;
+}
+
+static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ mm_segment_t old_fs = get_fs();
+ unsigned long kval;
+ unsigned int __user *uvp;
+ int error;
+
+ set_fs(KERNEL_DS);
+ error = __blkdev_driver_ioctl(bdev, mode,
+ cmd, (unsigned long)(&kval));
+ set_fs(old_fs);
+
+ if (error == 0) {
+ uvp = compat_ptr(arg);
+ if (put_user(kval, uvp))
+ error = -EFAULT;
+ }
+ return error;
+}
+
+struct compat_cdrom_read_audio {
+ union cdrom_addr addr;
+ u8 addr_format;
+ compat_int_t nframes;
+ compat_caddr_t buf;
+};
+
+struct compat_cdrom_generic_command {
+ unsigned char cmd[CDROM_PACKET_SIZE];
+ compat_caddr_t buffer;
+ compat_uint_t buflen;
+ compat_int_t stat;
+ compat_caddr_t sense;
+ unsigned char data_direction;
+ compat_int_t quiet;
+ compat_int_t timeout;
+ compat_caddr_t reserved[1];
+};
+
+static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct cdrom_read_audio __user *cdread_audio;
+ struct compat_cdrom_read_audio __user *cdread_audio32;
+ __u32 data;
+ void __user *datap;
+
+ cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
+ cdread_audio32 = compat_ptr(arg);
+
+ if (copy_in_user(&cdread_audio->addr,
+ &cdread_audio32->addr,
+ (sizeof(*cdread_audio32) -
+ sizeof(compat_caddr_t))))
+ return -EFAULT;
+
+ if (get_user(data, &cdread_audio32->buf))
+ return -EFAULT;
+ datap = compat_ptr(data);
+ if (put_user(datap, &cdread_audio->buf))
+ return -EFAULT;
+
+ return __blkdev_driver_ioctl(bdev, mode, cmd,
+ (unsigned long)cdread_audio);
+}
+
+static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct cdrom_generic_command __user *cgc;
+ struct compat_cdrom_generic_command __user *cgc32;
+ u32 data;
+ unsigned char dir;
+ int itmp;
+
+ cgc = compat_alloc_user_space(sizeof(*cgc));
+ cgc32 = compat_ptr(arg);
+
+ if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
+ get_user(data, &cgc32->buffer) ||
+ put_user(compat_ptr(data), &cgc->buffer) ||
+ copy_in_user(&cgc->buflen, &cgc32->buflen,
+ (sizeof(unsigned int) + sizeof(int))) ||
+ get_user(data, &cgc32->sense) ||
+ put_user(compat_ptr(data), &cgc->sense) ||
+ get_user(dir, &cgc32->data_direction) ||
+ put_user(dir, &cgc->data_direction) ||
+ get_user(itmp, &cgc32->quiet) ||
+ put_user(itmp, &cgc->quiet) ||
+ get_user(itmp, &cgc32->timeout) ||
+ put_user(itmp, &cgc->timeout) ||
+ get_user(data, &cgc32->reserved[0]) ||
+ put_user(compat_ptr(data), &cgc->reserved[0]))
+ return -EFAULT;
+
+ return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
+}
+
+struct compat_blkpg_ioctl_arg {
+ compat_int_t op;
+ compat_int_t flags;
+ compat_int_t datalen;
+ compat_caddr_t data;
+};
+
+static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
+{
+ struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
+ compat_caddr_t udata;
+ compat_int_t n;
+ int err;
+
+ err = get_user(n, &ua32->op);
+ err |= put_user(n, &a->op);
+ err |= get_user(n, &ua32->flags);
+ err |= put_user(n, &a->flags);
+ err |= get_user(n, &ua32->datalen);
+ err |= put_user(n, &a->datalen);
+ err |= get_user(udata, &ua32->data);
+ err |= put_user(compat_ptr(udata), &a->data);
+ if (err)
+ return err;
+
+ return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
+}
+
+#define BLKBSZGET_32 _IOR(0x12, 112, int)
+#define BLKBSZSET_32 _IOW(0x12, 113, int)
+#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
+
+struct compat_floppy_drive_params {
+ char cmos;
+ compat_ulong_t max_dtr;
+ compat_ulong_t hlt;
+ compat_ulong_t hut;
+ compat_ulong_t srt;
+ compat_ulong_t spinup;
+ compat_ulong_t spindown;
+ unsigned char spindown_offset;
+ unsigned char select_delay;
+ unsigned char rps;
+ unsigned char tracks;
+ compat_ulong_t timeout;
+ unsigned char interleave_sect;
+ struct floppy_max_errors max_errors;
+ char flags;
+ char read_track;
+ short autodetect[8];
+ compat_int_t checkfreq;
+ compat_int_t native_format;
+};
+
+struct compat_floppy_drive_struct {
+ signed char flags;
+ compat_ulong_t spinup_date;
+ compat_ulong_t select_date;
+ compat_ulong_t first_read_date;
+ short probed_format;
+ short track;
+ short maxblock;
+ short maxtrack;
+ compat_int_t generation;
+ compat_int_t keep_data;
+ compat_int_t fd_ref;
+ compat_int_t fd_device;
+ compat_int_t last_checked;
+ compat_caddr_t dmabuf;
+ compat_int_t bufblocks;
+};
+
+struct compat_floppy_fdc_state {
+ compat_int_t spec1;
+ compat_int_t spec2;
+ compat_int_t dtr;
+ unsigned char version;
+ unsigned char dor;
+ compat_ulong_t address;
+ unsigned int rawcmd:2;
+ unsigned int reset:1;
+ unsigned int need_configure:1;
+ unsigned int perp_mode:2;
+ unsigned int has_fifo:1;
+ unsigned int driver_version;
+ unsigned char track[4];
+};
+
+struct compat_floppy_write_errors {
+ unsigned int write_errors;
+ compat_ulong_t first_error_sector;
+ compat_int_t first_error_generation;
+ compat_ulong_t last_error_sector;
+ compat_int_t last_error_generation;
+ compat_uint_t badness;
+};
+
+#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
+#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
+#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
+#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
+#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
+#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
+#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
+#define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
+
+static struct {
+ unsigned int cmd32;
+ unsigned int cmd;
+} fd_ioctl_trans_table[] = {
+ { FDSETPRM32, FDSETPRM },
+ { FDDEFPRM32, FDDEFPRM },
+ { FDGETPRM32, FDGETPRM },
+ { FDSETDRVPRM32, FDSETDRVPRM },
+ { FDGETDRVPRM32, FDGETDRVPRM },
+ { FDGETDRVSTAT32, FDGETDRVSTAT },
+ { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
+ { FDGETFDCSTAT32, FDGETFDCSTAT },
+ { FDWERRORGET32, FDWERRORGET }
+};
+
+#define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
+
+static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ mm_segment_t old_fs = get_fs();
+ void *karg = NULL;
+ unsigned int kcmd = 0;
+ int i, err;
+
+ for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
+ if (cmd == fd_ioctl_trans_table[i].cmd32) {
+ kcmd = fd_ioctl_trans_table[i].cmd;
+ break;
+ }
+ if (!kcmd)
+ return -EINVAL;
+
+ switch (cmd) {
+ case FDSETPRM32:
+ case FDDEFPRM32:
+ case FDGETPRM32:
+ {
+ compat_uptr_t name;
+ struct compat_floppy_struct __user *uf;
+ struct floppy_struct *f;
+
+ uf = compat_ptr(arg);
+ f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
+ if (!karg)
+ return -ENOMEM;
+ if (cmd == FDGETPRM32)
+ break;
+ err = __get_user(f->size, &uf->size);
+ err |= __get_user(f->sect, &uf->sect);
+ err |= __get_user(f->head, &uf->head);
+ err |= __get_user(f->track, &uf->track);
+ err |= __get_user(f->stretch, &uf->stretch);
+ err |= __get_user(f->gap, &uf->gap);
+ err |= __get_user(f->rate, &uf->rate);
+ err |= __get_user(f->spec1, &uf->spec1);
+ err |= __get_user(f->fmt_gap, &uf->fmt_gap);
+ err |= __get_user(name, &uf->name);
+ f->name = compat_ptr(name);
+ if (err) {
+ err = -EFAULT;
+ goto out;
+ }
+ break;
+ }
+ case FDSETDRVPRM32:
+ case FDGETDRVPRM32:
+ {
+ struct compat_floppy_drive_params __user *uf;
+ struct floppy_drive_params *f;
+
+ uf = compat_ptr(arg);
+ f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
+ if (!karg)
+ return -ENOMEM;
+ if (cmd == FDGETDRVPRM32)
+ break;
+ err = __get_user(f->cmos, &uf->cmos);
+ err |= __get_user(f->max_dtr, &uf->max_dtr);
+ err |= __get_user(f->hlt, &uf->hlt);
+ err |= __get_user(f->hut, &uf->hut);
+ err |= __get_user(f->srt, &uf->srt);
+ err |= __get_user(f->spinup, &uf->spinup);
+ err |= __get_user(f->spindown, &uf->spindown);
+ err |= __get_user(f->spindown_offset, &uf->spindown_offset);
+ err |= __get_user(f->select_delay, &uf->select_delay);
+ err |= __get_user(f->rps, &uf->rps);
+ err |= __get_user(f->tracks, &uf->tracks);
+ err |= __get_user(f->timeout, &uf->timeout);
+ err |= __get_user(f->interleave_sect, &uf->interleave_sect);
+ err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
+ err |= __get_user(f->flags, &uf->flags);
+ err |= __get_user(f->read_track, &uf->read_track);
+ err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
+ err |= __get_user(f->checkfreq, &uf->checkfreq);
+ err |= __get_user(f->native_format, &uf->native_format);
+ if (err) {
+ err = -EFAULT;
+ goto out;
+ }
+ break;
+ }
+ case FDGETDRVSTAT32:
+ case FDPOLLDRVSTAT32:
+ karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
+ if (!karg)
+ return -ENOMEM;
+ break;
+ case FDGETFDCSTAT32:
+ karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
+ if (!karg)
+ return -ENOMEM;
+ break;
+ case FDWERRORGET32:
+ karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
+ if (!karg)
+ return -ENOMEM;
+ break;
+ default:
+ return -EINVAL;
+ }
+ set_fs(KERNEL_DS);
+ err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
+ set_fs(old_fs);
+ if (err)
+ goto out;
+ switch (cmd) {
+ case FDGETPRM32:
+ {
+ struct floppy_struct *f = karg;
+ struct compat_floppy_struct __user *uf = compat_ptr(arg);
+
+ err = __put_user(f->size, &uf->size);
+ err |= __put_user(f->sect, &uf->sect);
+ err |= __put_user(f->head, &uf->head);
+ err |= __put_user(f->track, &uf->track);
+ err |= __put_user(f->stretch, &uf->stretch);
+ err |= __put_user(f->gap, &uf->gap);
+ err |= __put_user(f->rate, &uf->rate);
+ err |= __put_user(f->spec1, &uf->spec1);
+ err |= __put_user(f->fmt_gap, &uf->fmt_gap);
+ err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
+ break;
+ }
+ case FDGETDRVPRM32:
+ {
+ struct compat_floppy_drive_params __user *uf;
+ struct floppy_drive_params *f = karg;
+
+ uf = compat_ptr(arg);
+ err = __put_user(f->cmos, &uf->cmos);
+ err |= __put_user(f->max_dtr, &uf->max_dtr);
+ err |= __put_user(f->hlt, &uf->hlt);
+ err |= __put_user(f->hut, &uf->hut);
+ err |= __put_user(f->srt, &uf->srt);
+ err |= __put_user(f->spinup, &uf->spinup);
+ err |= __put_user(f->spindown, &uf->spindown);
+ err |= __put_user(f->spindown_offset, &uf->spindown_offset);
+ err |= __put_user(f->select_delay, &uf->select_delay);
+ err |= __put_user(f->rps, &uf->rps);
+ err |= __put_user(f->tracks, &uf->tracks);
+ err |= __put_user(f->timeout, &uf->timeout);
+ err |= __put_user(f->interleave_sect, &uf->interleave_sect);
+ err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
+ err |= __put_user(f->flags, &uf->flags);
+ err |= __put_user(f->read_track, &uf->read_track);
+ err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
+ err |= __put_user(f->checkfreq, &uf->checkfreq);
+ err |= __put_user(f->native_format, &uf->native_format);
+ break;
+ }
+ case FDGETDRVSTAT32:
+ case FDPOLLDRVSTAT32:
+ {
+ struct compat_floppy_drive_struct __user *uf;
+ struct floppy_drive_struct *f = karg;
+
+ uf = compat_ptr(arg);
+ err = __put_user(f->flags, &uf->flags);
+ err |= __put_user(f->spinup_date, &uf->spinup_date);
+ err |= __put_user(f->select_date, &uf->select_date);
+ err |= __put_user(f->first_read_date, &uf->first_read_date);
+ err |= __put_user(f->probed_format, &uf->probed_format);
+ err |= __put_user(f->track, &uf->track);
+ err |= __put_user(f->maxblock, &uf->maxblock);
+ err |= __put_user(f->maxtrack, &uf->maxtrack);
+ err |= __put_user(f->generation, &uf->generation);
+ err |= __put_user(f->keep_data, &uf->keep_data);
+ err |= __put_user(f->fd_ref, &uf->fd_ref);
+ err |= __put_user(f->fd_device, &uf->fd_device);
+ err |= __put_user(f->last_checked, &uf->last_checked);
+ err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
+ err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
+ break;
+ }
+ case FDGETFDCSTAT32:
+ {
+ struct compat_floppy_fdc_state __user *uf;
+ struct floppy_fdc_state *f = karg;
+
+ uf = compat_ptr(arg);
+ err = __put_user(f->spec1, &uf->spec1);
+ err |= __put_user(f->spec2, &uf->spec2);
+ err |= __put_user(f->dtr, &uf->dtr);
+ err |= __put_user(f->version, &uf->version);
+ err |= __put_user(f->dor, &uf->dor);
+ err |= __put_user(f->address, &uf->address);
+ err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
+ (char *)&f->address + sizeof(f->address), sizeof(int));
+ err |= __put_user(f->driver_version, &uf->driver_version);
+ err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
+ break;
+ }
+ case FDWERRORGET32:
+ {
+ struct compat_floppy_write_errors __user *uf;
+ struct floppy_write_errors *f = karg;
+
+ uf = compat_ptr(arg);
+ err = __put_user(f->write_errors, &uf->write_errors);
+ err |= __put_user(f->first_error_sector, &uf->first_error_sector);
+ err |= __put_user(f->first_error_generation, &uf->first_error_generation);
+ err |= __put_user(f->last_error_sector, &uf->last_error_sector);
+ err |= __put_user(f->last_error_generation, &uf->last_error_generation);
+ err |= __put_user(f->badness, &uf->badness);
+ break;
+ }
+ default:
+ break;
+ }
+ if (err)
+ err = -EFAULT;
+
+out:
+ kfree(karg);
+ return err;
+}
+
+static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case HDIO_GET_UNMASKINTR:
+ case HDIO_GET_MULTCOUNT:
+ case HDIO_GET_KEEPSETTINGS:
+ case HDIO_GET_32BIT:
+ case HDIO_GET_NOWERR:
+ case HDIO_GET_DMA:
+ case HDIO_GET_NICE:
+ case HDIO_GET_WCACHE:
+ case HDIO_GET_ACOUSTIC:
+ case HDIO_GET_ADDRESS:
+ case HDIO_GET_BUSSTATE:
+ return compat_hdio_ioctl(bdev, mode, cmd, arg);
+ case FDSETPRM32:
+ case FDDEFPRM32:
+ case FDGETPRM32:
+ case FDSETDRVPRM32:
+ case FDGETDRVPRM32:
+ case FDGETDRVSTAT32:
+ case FDPOLLDRVSTAT32:
+ case FDGETFDCSTAT32:
+ case FDWERRORGET32:
+ return compat_fd_ioctl(bdev, mode, cmd, arg);
+ case CDROMREADAUDIO:
+ return compat_cdrom_read_audio(bdev, mode, cmd, arg);
+ case CDROM_SEND_PACKET:
+ return compat_cdrom_generic_command(bdev, mode, cmd, arg);
+
+ /*
+ * No handler required for the ones below, we just need to
+ * convert arg to a 64 bit pointer.
+ */
+ case BLKSECTSET:
+ /*
+ * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
+ * Some need translations, these do not.
+ */
+ case HDIO_GET_IDENTITY:
+ case HDIO_DRIVE_TASK:
+ case HDIO_DRIVE_CMD:
+ /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
+ case 0x330:
+ /* 0x02 -- Floppy ioctls */
+ case FDMSGON:
+ case FDMSGOFF:
+ case FDSETEMSGTRESH:
+ case FDFLUSH:
+ case FDWERRORCLR:
+ case FDSETMAXERRS:
+ case FDGETMAXERRS:
+ case FDGETDRVTYP:
+ case FDEJECT:
+ case FDCLRPRM:
+ case FDFMTBEG:
+ case FDFMTEND:
+ case FDRESET:
+ case FDTWADDLE:
+ case FDFMTTRK:
+ case FDRAWCMD:
+ /* CDROM stuff */
+ case CDROMPAUSE:
+ case CDROMRESUME:
+ case CDROMPLAYMSF:
+ case CDROMPLAYTRKIND:
+ case CDROMREADTOCHDR:
+ case CDROMREADTOCENTRY:
+ case CDROMSTOP:
+ case CDROMSTART:
+ case CDROMEJECT:
+ case CDROMVOLCTRL:
+ case CDROMSUBCHNL:
+ case CDROMMULTISESSION:
+ case CDROM_GET_MCN:
+ case CDROMRESET:
+ case CDROMVOLREAD:
+ case CDROMSEEK:
+ case CDROMPLAYBLK:
+ case CDROMCLOSETRAY:
+ case CDROM_DISC_STATUS:
+ case CDROM_CHANGER_NSLOTS:
+ case CDROM_GET_CAPABILITY:
+ /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
+ * not take a struct cdrom_read, instead they take a struct cdrom_msf
+ * which is compatible.
+ */
+ case CDROMREADMODE2:
+ case CDROMREADMODE1:
+ case CDROMREADRAW:
+ case CDROMREADCOOKED:
+ case CDROMREADALL:
+ /* DVD ioctls */
+ case DVD_READ_STRUCT:
+ case DVD_WRITE_STRUCT:
+ case DVD_AUTH:
+ arg = (unsigned long)compat_ptr(arg);
+ /* These intepret arg as an unsigned long, not as a pointer,
+ * so we must not do compat_ptr() conversion. */
+ case HDIO_SET_MULTCOUNT:
+ case HDIO_SET_UNMASKINTR:
+ case HDIO_SET_KEEPSETTINGS:
+ case HDIO_SET_32BIT:
+ case HDIO_SET_NOWERR:
+ case HDIO_SET_DMA:
+ case HDIO_SET_PIO_MODE:
+ case HDIO_SET_NICE:
+ case HDIO_SET_WCACHE:
+ case HDIO_SET_ACOUSTIC:
+ case HDIO_SET_BUSSTATE:
+ case HDIO_SET_ADDRESS:
+ case CDROMEJECT_SW:
+ case CDROM_SET_OPTIONS:
+ case CDROM_CLEAR_OPTIONS:
+ case CDROM_SELECT_SPEED:
+ case CDROM_SELECT_DISC:
+ case CDROM_MEDIA_CHANGED:
+ case CDROM_DRIVE_STATUS:
+ case CDROM_LOCKDOOR:
+ case CDROM_DEBUG:
+ break;
+ default:
+ /* unknown ioctl number */
+ return -ENOIOCTLCMD;
+ }
+
+ return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
+}
+
+/* Most of the generic ioctls are handled in the normal fallback path.
+ This assumes the blkdev's low level compat_ioctl always returns
+ ENOIOCTLCMD for unknown ioctls. */
+long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+ int ret = -ENOIOCTLCMD;
+ struct inode *inode = file->f_mapping->host;
+ struct block_device *bdev = inode->i_bdev;
+ struct gendisk *disk = bdev->bd_disk;
+ fmode_t mode = file->f_mode;
+ struct backing_dev_info *bdi;
+ loff_t size;
+ unsigned int max_sectors;
+
+ /*
+ * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
+ * to updated it before every ioctl.
+ */
+ if (file->f_flags & O_NDELAY)
+ mode |= FMODE_NDELAY;
+ else
+ mode &= ~FMODE_NDELAY;
+
+ switch (cmd) {
+ case HDIO_GETGEO:
+ return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
+ case BLKPBSZGET:
+ return compat_put_uint(arg, bdev_physical_block_size(bdev));
+ case BLKIOMIN:
+ return compat_put_uint(arg, bdev_io_min(bdev));
+ case BLKIOOPT:
+ return compat_put_uint(arg, bdev_io_opt(bdev));
+ case BLKALIGNOFF:
+ return compat_put_int(arg, bdev_alignment_offset(bdev));
+ case BLKDISCARDZEROES:
+ return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
+ case BLKFLSBUF:
+ case BLKROSET:
+ case BLKDISCARD:
+ case BLKSECDISCARD:
+ case BLKZEROOUT:
+ /*
+ * the ones below are implemented in blkdev_locked_ioctl,
+ * but we call blkdev_ioctl, which gets the lock for us
+ */
+ case BLKRRPART:
+ return blkdev_ioctl(bdev, mode, cmd,
+ (unsigned long)compat_ptr(arg));
+ case BLKBSZSET_32:
+ return blkdev_ioctl(bdev, mode, BLKBSZSET,
+ (unsigned long)compat_ptr(arg));
+ case BLKPG:
+ return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
+ case BLKRAGET:
+ case BLKFRAGET:
+ if (!arg)
+ return -EINVAL;
+ bdi = blk_get_backing_dev_info(bdev);
+ return compat_put_long(arg,
+ (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
+ case BLKROGET: /* compatible */
+ return compat_put_int(arg, bdev_read_only(bdev) != 0);
+ case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
+ return compat_put_int(arg, block_size(bdev));
+ case BLKSSZGET: /* get block device hardware sector size */
+ return compat_put_int(arg, bdev_logical_block_size(bdev));
+ case BLKSECTGET:
+ max_sectors = min_t(unsigned int, USHRT_MAX,
+ queue_max_sectors(bdev_get_queue(bdev)));
+ return compat_put_ushort(arg, max_sectors);
+ case BLKROTATIONAL:
+ return compat_put_ushort(arg,
+ !blk_queue_nonrot(bdev_get_queue(bdev)));
+ case BLKRASET: /* compatible, but no compat_ptr (!) */
+ case BLKFRASET:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ bdi = blk_get_backing_dev_info(bdev);
+ bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
+ return 0;
+ case BLKGETSIZE:
+ size = i_size_read(bdev->bd_inode);
+ if ((size >> 9) > ~0UL)
+ return -EFBIG;
+ return compat_put_ulong(arg, size >> 9);
+
+ case BLKGETSIZE64_32:
+ return compat_put_u64(arg, i_size_read(bdev->bd_inode));
+
+ case BLKTRACESETUP32:
+ case BLKTRACESTART: /* compatible */
+ case BLKTRACESTOP: /* compatible */
+ case BLKTRACETEARDOWN: /* compatible */
+ ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
+ return ret;
+ default:
+ if (disk->fops->compat_ioctl)
+ ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
+ if (ret == -ENOIOCTLCMD)
+ ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
+ return ret;
+ }
+}