#include <linux/kernel.h>#include <linux/gfp.h>#include <linux/ide.h> DEFINE_MUTEX(ide_setting_mtx); ide_devset_get(io_32bit, io_32bit); static int set_io_32bit(ide_drive_t *drive, int arg){	if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)		return -EPERM; 	if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))		return -EINVAL; 	drive->io_32bit = arg; 	return 0;} ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS); static int set_ksettings(ide_drive_t *drive, int arg){	if (arg < 0 || arg > 1)		return -EINVAL; 	if (arg)		drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;	else		drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS; 	return 0;} ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA); static int set_using_dma(ide_drive_t *drive, int arg){#ifdef CONFIG_BLK_DEV_IDEDMA	int err = -EPERM; 	if (arg < 0 || arg > 1)		return -EINVAL; 	if (ata_id_has_dma(drive->id) == 0)		goto out; 	if (drive->hwif->dma_ops == NULL)		goto out; 	err = 0; 	if (arg) {		if (ide_set_dma(drive))			err = -EIO;	} else		ide_dma_off(drive); out:	return err;#else	if (arg < 0 || arg > 1)		return -EINVAL; 	return -EPERM;#endif} /* * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away */static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio){	switch (req_pio) {	case 202:	case 201:	case 200:	case 102:	case 101:	case 100:		return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;	case 9:	case 8:		return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;	case 7:	case 6:		return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;	default:		return 0;	}} static int set_pio_mode(ide_drive_t *drive, int arg){	ide_hwif_t *hwif = drive->hwif;	const struct ide_port_ops *port_ops = hwif->port_ops; 	if (arg < 0 || arg > 255)		return -EINVAL; 	if (port_ops == NULL || port_ops->set_pio_mode == NULL ||	    (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))		return -ENOSYS; 	if (set_pio_mode_abuse(drive->hwif, arg)) {		drive->pio_mode = arg + XFER_PIO_0; 		if (arg == 8 || arg == 9) {			unsigned long flags; 			/* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */			spin_lock_irqsave(&hwif->lock, flags);			port_ops->set_pio_mode(hwif, drive);			spin_unlock_irqrestore(&hwif->lock, flags);		} else			port_ops->set_pio_mode(hwif, drive);	} else {		int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA); 		ide_set_pio(drive, arg); 		if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {			if (keep_dma)				ide_dma_on(drive);		}	} 	return 0;} ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK); static int set_unmaskirq(ide_drive_t *drive, int arg){	if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)		return -EPERM; 	if (arg < 0 || arg > 1)		return -EINVAL; 	if (arg)		drive->dev_flags |= IDE_DFLAG_UNMASK;	else		drive->dev_flags &= ~IDE_DFLAG_UNMASK; 	return 0;} ide_ext_devset_rw_sync(io_32bit, io_32bit);ide_ext_devset_rw_sync(keepsettings, ksettings);ide_ext_devset_rw_sync(unmaskirq, unmaskirq);ide_ext_devset_rw_sync(using_dma, using_dma);__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode); int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,		       int arg){	struct request_queue *q = drive->queue;	struct request *rq;	int ret = 0; 	if (!(setting->flags & DS_SYNC))		return setting->set(drive, arg); 	rq = blk_get_request(q, REQ_OP_DRV_IN, __GFP_RECLAIM);	ide_req(rq)->type = ATA_PRIV_MISC;	scsi_req(rq)->cmd_len = 5;	scsi_req(rq)->cmd[0] = REQ_DEVSET_EXEC;	*(int *)&scsi_req(rq)->cmd[1] = arg;	rq->special = setting->set; 	blk_execute_rq(q, NULL, rq, 0);	ret = scsi_req(rq)->result;	blk_put_request(rq); 	return ret;} ide_startstop_t ide_do_devset(ide_drive_t *drive, struct request *rq){	int err, (*setfunc)(ide_drive_t *, int) = rq->special; 	err = setfunc(drive, *(int *)&scsi_req(rq)->cmd[1]);	if (err)		scsi_req(rq)->result = err;	ide_complete_rq(drive, 0, blk_rq_bytes(rq));	return ide_stopped;}