/* * IDE ioctls handling. */ #include <linux/hdreg.h> #include <linux/ide.h> #include <linux/slab.h> static const struct ide_ioctl_devset ide_ioctl_settings[] = { { HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit }, { HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings }, { HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq }, { HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma }, { -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode }, { 0 } }; int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev, unsigned int cmd, unsigned long arg, const struct ide_ioctl_devset *s) { const struct ide_devset *ds; int err = -EOPNOTSUPP; for (; (ds = s->setting); s++) { if (ds->get && s->get_ioctl == cmd) goto read_val; else if (ds->set && s->set_ioctl == cmd) goto set_val; } return err; read_val: mutex_lock(&ide_setting_mtx); err = ds->get(drive); mutex_unlock(&ide_setting_mtx); return err >= 0 ? put_user(err, (long __user *)arg) : err; set_val: if (bdev != bdev->bd_contains) err = -EINVAL; else { if (!capable(CAP_SYS_ADMIN)) err = -EACCES; else { mutex_lock(&ide_setting_mtx); err = ide_devset_execute(drive, ds, arg); mutex_unlock(&ide_setting_mtx); } } return err; } EXPORT_SYMBOL_GPL(ide_setting_ioctl); static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) { u16 *id = NULL; int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142; int rc = 0; if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) { rc = -ENOMSG; goto out; } /* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */ id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL); if (id == NULL) { rc = -ENOMEM; goto out; } memcpy(id, drive->id, size); ata_id_to_hd_driveid(id); if (copy_to_user((void __user *)arg, id, size)) rc = -EFAULT; kfree(id); out: return rc; } static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg) { return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) << IDE_NICE_DSC_OVERLAP) | (!!(drive->dev_flags & IDE_DFLAG_NICE1) << IDE_NICE_1), (long __user *)arg); } static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg) { if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) return -EPERM; if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) && (drive->media != ide_tape)) return -EPERM; if ((arg >> IDE_NICE_DSC_OVERLAP) & 1) drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; else drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; if ((arg >> IDE_NICE_1) & 1) drive->dev_flags |= IDE_DFLAG_NICE1; else drive->dev_flags &= ~IDE_DFLAG_NICE1; return 0; } static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg) { u8 *buf = NULL; int bufsize = 0, err = 0; u8 args[4], xfer_rate = 0; struct ide_cmd cmd; struct ide_taskfile *tf = &cmd.tf; if (NULL == (void *) arg) { struct request *rq; rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_ATA_TASKFILE; err = blk_execute_rq(drive->queue, NULL, rq, 0); blk_put_request(rq); return err; } if (copy_from_user(args, (void __user *)arg, 4)) return -EFAULT; memset(&cmd, 0, sizeof(cmd)); tf->feature = args[2]; if (args[0] == ATA_CMD_SMART) { tf->nsect = args[3]; tf->lbal = args[1]; tf->lbam = 0x4f; tf->lbah = 0xc2; cmd.valid.out.tf = IDE_VALID_OUT_TF; cmd.valid.in.tf = IDE_VALID_NSECT; } else { tf->nsect = args[1]; cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT; cmd.valid.in.tf = IDE_VALID_NSECT; } tf->command = args[0]; cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA; if (args[3]) { cmd.tf_flags |= IDE_TFLAG_IO_16BIT; bufsize = SECTOR_SIZE * args[3]; buf = kzalloc(bufsize, GFP_KERNEL); if (buf == NULL) return -ENOMEM; } if (tf->command == ATA_CMD_SET_FEATURES && tf->feature == SETFEATURES_XFER && tf->nsect >= XFER_SW_DMA_0) { xfer_rate = ide_find_dma_mode(drive, tf->nsect); if (xfer_rate != tf->nsect) { err = -EINVAL; goto abort; } cmd.tf_flags |= IDE_TFLAG_SET_XFER; } err = ide_raw_taskfile(drive, &cmd, buf, args[3]); args[0] = tf->status; args[1] = tf->error; args[2] = tf->nsect; abort: if (copy_to_user((void __user *)arg, &args, 4)) err = -EFAULT; if (buf) { if (copy_to_user((void __user *)(arg + 4), buf, bufsize)) err = -EFAULT; kfree(buf); } return err; } static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg) { void __user *p = (void __user *)arg; int err = 0; u8 args[7]; struct ide_cmd cmd; if (copy_from_user(args, p, 7)) return -EFAULT; memset(&cmd, 0, sizeof(cmd)); memcpy(&cmd.tf.feature, &args[1], 6); cmd.tf.command = args[0]; cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; err = ide_no_data_taskfile(drive, &cmd); args[0] = cmd.tf.command; memcpy(&args[1], &cmd.tf.feature, 6); if (copy_to_user(p, args, 7)) err = -EFAULT; return err; } static int generic_drive_reset(ide_drive_t *drive) { struct request *rq; int ret = 0; rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_SPECIAL; rq->cmd_len = 1; rq->cmd[0] = REQ_DRIVE_RESET; if (blk_execute_rq(drive->queue, NULL, rq, 1)) ret = rq->errors; blk_put_request(rq); return ret; } int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev, unsigned int cmd, unsigned long arg) { int err; err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings); if (err != -EOPNOTSUPP) return err; switch (cmd) { case HDIO_OBSOLETE_IDENTITY: case HDIO_GET_IDENTITY: if (bdev != bdev->bd_contains) return -EINVAL; return ide_get_identity_ioctl(drive, cmd, arg); case HDIO_GET_NICE: return ide_get_nice_ioctl(drive, arg); case HDIO_SET_NICE: if (!capable(CAP_SYS_ADMIN)) return -EACCES; return ide_set_nice_ioctl(drive, arg); #ifdef CONFIG_IDE_TASK_IOCTL case HDIO_DRIVE_TASKFILE: if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) return -EACCES; if (drive->media == ide_disk) return ide_taskfile_ioctl(drive, arg); return -ENOMSG; #endif case HDIO_DRIVE_CMD: if (!capable(CAP_SYS_RAWIO)) return -EACCES; return ide_cmd_ioctl(drive, arg); case HDIO_DRIVE_TASK: if (!capable(CAP_SYS_RAWIO)) return -EACCES; return ide_task_ioctl(drive, arg); case HDIO_DRIVE_RESET: if (!capable(CAP_SYS_ADMIN)) return -EACCES; return generic_drive_reset(drive); case HDIO_GET_BUSSTATE: if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (put_user(BUSSTATE_ON, (long __user *)arg)) return -EFAULT; return 0; case HDIO_SET_BUSSTATE: if (!capable(CAP_SYS_ADMIN)) return -EACCES; return -EOPNOTSUPP; default: return -EINVAL; } } EXPORT_SYMBOL(generic_ide_ioctl);