[net-next-2.6.git] / drivers / ide / ide-floppy_ioctl.c

/*
 * ide-floppy IOCTLs handling.
 */

#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/cdrom.h>
#include <linux/mutex.h>

#include <asm/unaligned.h>

#include <scsi/scsi_ioctl.h>

#include "ide-floppy.h"

/*
 * Obtain the list of formattable capacities.
 * Very similar to ide_floppy_get_capacity, except that we push the capacity
 * descriptors to userland, instead of our own structures.
 *
 * Userland gives us the following structure:
 *
 * struct idefloppy_format_capacities {
 *	int nformats;
 *	struct {
 *		int nblocks;
 *		int blocksize;
 *	} formats[];
 * };
 *
 * userland initializes nformats to the number of allocated formats[] records.
 * On exit we set nformats to the number of records we've actually initialized.
 */

static DEFINE_MUTEX(ide_floppy_ioctl_mutex);
static int ide_floppy_get_format_capacities(ide_drive_t *drive,
					    struct ide_atapi_pc *pc,
					    int __user *arg)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	int i, blocks, length, u_array_size, u_index;
	int __user *argp;
	u8 pc_buf[256], header_len, desc_cnt;

	if (get_user(u_array_size, arg))
		return -EFAULT;

	if (u_array_size <= 0)
		return -EINVAL;

	ide_floppy_create_read_capacity_cmd(pc);

	if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
		return -EIO;
	}

	header_len = pc_buf[3];
	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

	u_index = 0;
	argp = arg + 1;

	/*
	 * We always skip the first capacity descriptor.  That's the current
	 * capacity.  We are interested in the remaining descriptors, the
	 * formattable capacities.
	 */
	for (i = 1; i < desc_cnt; i++) {
		unsigned int desc_start = 4 + i*8;

		if (u_index >= u_array_size)
			break;	/* User-supplied buffer too small */

		blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
		length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);

		if (put_user(blocks, argp))
			return -EFAULT;

		++argp;

		if (put_user(length, argp))
			return -EFAULT;

		++argp;

		++u_index;
	}

	if (put_user(u_index, arg))
		return -EFAULT;

	return 0;
}

static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc,
					      u8 *buf, int b, int l,
					      int flags)
{
	ide_init_pc(pc);
	pc->c[0] = GPCMD_FORMAT_UNIT;
	pc->c[1] = 0x17;

	memset(buf, 0, 12);
	buf[1] = 0xA2;
	/* Default format list header, u8 1: FOV/DCRT/IMM bits set */

	if (flags & 1)				/* Verify bit on... */
		buf[1] ^= 0x20;			/* ... turn off DCRT bit */
	buf[3] = 8;

	put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
	put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
	pc->req_xfer = 12;
	pc->flags |= PC_FLAG_WRITING;
}

static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	u8 buf[20];

	drive->atapi_flags &= ~IDE_AFLAG_SRFP;

	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
	pc->flags |= PC_FLAG_SUPPRESS_ERROR;

	if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
		return 1;

	if (buf[8 + 2] & 0x40)
		drive->atapi_flags |= IDE_AFLAG_SRFP;

	return 0;
}

static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
				  int __user *arg)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	u8 buf[12];
	int blocks, length, flags, err = 0;

	if (floppy->openers > 1) {
		/* Don't format if someone is using the disk */
		drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
		return -EBUSY;
	}

	drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS;

	/*
	 * Send ATAPI_FORMAT_UNIT to the drive.
	 *
	 * Userland gives us the following structure:
	 *
	 * struct idefloppy_format_command {
	 *        int nblocks;
	 *        int blocksize;
	 *        int flags;
	 *        } ;
	 *
	 * flags is a bitmask, currently, the only defined flag is:
	 *
	 *        0x01 - verify media after format.
	 */
	if (get_user(blocks, arg) ||
			get_user(length, arg+1) ||
			get_user(flags, arg+2)) {
		err = -EFAULT;
		goto out;
	}

	ide_floppy_get_sfrp_bit(drive, pc);
	ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);

	if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
		err = -EIO;

out:
	if (err)
		drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
	return err;
}

/*
 * Get ATAPI_FORMAT_UNIT progress indication.
 *
 * Userland gives a pointer to an int.  The int is set to a progress
 * indicator 0-65536, with 65536=100%.
 *
 * If the drive does not support format progress indication, we just check
 * the dsc bit, and return either 0 or 65536.
 */

static int ide_floppy_get_format_progress(ide_drive_t *drive,
					  struct ide_atapi_pc *pc,
					  int __user *arg)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	u8 sense_buf[18];
	int progress_indication = 0x10000;

	if (drive->atapi_flags & IDE_AFLAG_SRFP) {
		ide_create_request_sense_cmd(drive, pc);
		if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf,
				      pc->req_xfer))
			return -EIO;

		if (floppy->sense_key == 2 &&
		    floppy->asc == 4 &&
		    floppy->ascq == 4)
			progress_indication = floppy->progress_indication;

		/* Else assume format_unit has finished, and we're at 0x10000 */
	} else {
		ide_hwif_t *hwif = drive->hwif;
		unsigned long flags;
		u8 stat;

		local_irq_save(flags);
		stat = hwif->tp_ops->read_status(hwif);
		local_irq_restore(flags);

		progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
	}

	if (put_user(progress_indication, arg))
		return -EFAULT;

	return 0;
}

static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
			       unsigned long arg, unsigned int cmd)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	struct gendisk *disk = floppy->disk;
	int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;

	if (floppy->openers > 1)
		return -EBUSY;

	ide_set_media_lock(drive, disk, prevent);

	if (cmd == CDROMEJECT)
		ide_do_start_stop(drive, disk, 2);

	return 0;
}

static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc,
				   fmode_t mode, unsigned int cmd,
				   void __user *argp)
{
	switch (cmd) {
	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
		return 0;
	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
		return ide_floppy_get_format_capacities(drive, pc, argp);
	case IDEFLOPPY_IOCTL_FORMAT_START:
		if (!(mode & FMODE_WRITE))
			return -EPERM;
		return ide_floppy_format_unit(drive, pc, (int __user *)argp);
	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
		return ide_floppy_get_format_progress(drive, pc, argp);
	default:
		return -ENOTTY;
	}
}

int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
		     fmode_t mode, unsigned int cmd, unsigned long arg)
{
	struct ide_atapi_pc pc;
	void __user *argp = (void __user *)arg;
	int err;

	mutex_lock(&ide_floppy_ioctl_mutex);
	if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
		err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
		goto out;
	}

	err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
	if (err != -ENOTTY)
		goto out;

	/*
	 * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
	 * and CDROM_SEND_PACKET (legacy) ioctls
	 */
	if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
		err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk,
				mode, cmd, argp);

	if (err == -ENOTTY)
		err = generic_ide_ioctl(drive, bdev, cmd, arg);

out:
	mutex_unlock(&ide_floppy_ioctl_mutex);
	return err;
}
Commit	Line	Data
0127854d BZ	1	/*
	2	* ide-floppy IOCTLs handling.
	3	*/
	4
	5	#include <linux/kernel.h>
	6	#include <linux/ide.h>
	7	#include <linux/cdrom.h>
2a48fc0a	8	#include <linux/mutex.h>
0127854d BZ	9
	10	#include <asm/unaligned.h>
	11
	12	#include <scsi/scsi_ioctl.h>
	13
	14	#include "ide-floppy.h"
	15
	16	/*
	17	* Obtain the list of formattable capacities.
	18	* Very similar to ide_floppy_get_capacity, except that we push the capacity
	19	* descriptors to userland, instead of our own structures.
	20	*
	21	* Userland gives us the following structure:
	22	*
	23	* struct idefloppy_format_capacities {
	24	* int nformats;
	25	* struct {
	26	* int nblocks;
	27	* int blocksize;
	28	* } formats[];
	29	* };
	30	*
	31	* userland initializes nformats to the number of allocated formats[] records.
	32	* On exit we set nformats to the number of records we've actually initialized.
	33	*/
	34
2a48fc0a	35	static DEFINE_MUTEX(ide_floppy_ioctl_mutex);
07bd3f47 LT	36	static int ide_floppy_get_format_capacities(ide_drive_t *drive,
	37	struct ide_atapi_pc *pc,
	38	int __user *arg)
0127854d	39	{
806f80a6	40	struct ide_disk_obj *floppy = drive->driver_data;
0127854d BZ	41	int i, blocks, length, u_array_size, u_index;
0127854d BZ	42	int __user *argp;
41fa9f86	43	u8 pc_buf[256], header_len, desc_cnt;
0127854d BZ	44
	45	if (get_user(u_array_size, arg))
	46	return -EFAULT;
	47
	48	if (u_array_size <= 0)
	49	return -EINVAL;
	50
07bd3f47	51	ide_floppy_create_read_capacity_cmd(pc);
41fa9f86	52
b13345f3	53	if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
0127854d BZ	54	printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
	55	return -EIO;
	56	}
	57
b13345f3	58	header_len = pc_buf[3];
0127854d BZ	59	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
	60
	61	u_index = 0;
	62	argp = arg + 1;
	63
	64	/*
	65	* We always skip the first capacity descriptor. That's the current
	66	* capacity. We are interested in the remaining descriptors, the
	67	* formattable capacities.
	68	*/
	69	for (i = 1; i < desc_cnt; i++) {
	70	unsigned int desc_start = 4 + i*8;
	71
	72	if (u_index >= u_array_size)
	73	break; /* User-supplied buffer too small */
	74
b13345f3 BP	75	blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
b13345f3 BP	76	length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
0127854d BZ	77
	78	if (put_user(blocks, argp))
	79	return -EFAULT;
	80
	81	++argp;
	82
	83	if (put_user(length, argp))
	84	return -EFAULT;
	85
	86	++argp;
	87
	88	++u_index;
	89	}
	90
	91	if (put_user(u_index, arg))
	92	return -EFAULT;
	93
	94	return 0;
	95	}
	96
5122e517 BP	97	static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc,
	98	u8 *buf, int b, int l,
	99	int flags)
0127854d BZ	100	{
	101	ide_init_pc(pc);
	102	pc->c[0] = GPCMD_FORMAT_UNIT;
	103	pc->c[1] = 0x17;
	104
5122e517 BP	105	memset(buf, 0, 12);
5122e517 BP	106	buf[1] = 0xA2;
0127854d BZ	107	/* Default format list header, u8 1: FOV/DCRT/IMM bits set */
	108
	109	if (flags & 1) /* Verify bit on... */
5122e517 BP	110	buf[1] ^= 0x20; /* ... turn off DCRT bit */
5122e517 BP	111	buf[3] = 8;
0127854d	112
5122e517 BP	113	put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
	114	put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
	115	pc->req_xfer = 12;
0127854d BZ	116	pc->flags \|= PC_FLAG_WRITING;
	117	}
	118
07bd3f47	119	static int ide_floppy_get_sfrp_bit(ide_drive_t drive, struct ide_atapi_pc pc)
0127854d	120	{
0df96277	121	struct ide_disk_obj *floppy = drive->driver_data;
802e6634	122	u8 buf[20];
0127854d BZ	123
	124	drive->atapi_flags &= ~IDE_AFLAG_SRFP;
	125
07bd3f47 LT	126	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
07bd3f47 LT	127	pc->flags \|= PC_FLAG_SUPPRESS_ERROR;
0127854d	128
802e6634	129	if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
0127854d BZ	130	return 1;
0127854d BZ	131
802e6634	132	if (buf[8 + 2] & 0x40)
0127854d BZ	133	drive->atapi_flags \|= IDE_AFLAG_SRFP;
	134
	135	return 0;
	136	}
	137
07bd3f47 LT	138	static int ide_floppy_format_unit(ide_drive_t drive, struct ide_atapi_pc pc,
07bd3f47 LT	139	int __user *arg)
0127854d	140	{
0df96277	141	struct ide_disk_obj *floppy = drive->driver_data;
5122e517	142	u8 buf[12];
0127854d BZ	143	int blocks, length, flags, err = 0;
	144
	145	if (floppy->openers > 1) {
	146	/* Don't format if someone is using the disk */
e0128628	147	drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
0127854d BZ	148	return -EBUSY;
	149	}
	150
e0128628	151	drive->dev_flags \|= IDE_DFLAG_FORMAT_IN_PROGRESS;
0127854d BZ	152
	153	/*
	154	* Send ATAPI_FORMAT_UNIT to the drive.
	155	*
	156	* Userland gives us the following structure:
	157	*
	158	* struct idefloppy_format_command {
	159	* int nblocks;
	160	* int blocksize;
	161	* int flags;
	162	* } ;
	163	*
	164	* flags is a bitmask, currently, the only defined flag is:
	165	*
	166	* 0x01 - verify media after format.
	167	*/
	168	if (get_user(blocks, arg) \|\|
	169	get_user(length, arg+1) \|\|
	170	get_user(flags, arg+2)) {
	171	err = -EFAULT;
	172	goto out;
	173	}
	174
07bd3f47	175	ide_floppy_get_sfrp_bit(drive, pc);
5122e517	176	ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);
0127854d	177
5122e517	178	if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
0127854d BZ	179	err = -EIO;
	180
	181	out:
	182	if (err)
e0128628	183	drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
0127854d BZ	184	return err;
	185	}
	186
	187	/*
	188	* Get ATAPI_FORMAT_UNIT progress indication.
	189	*
	190	* Userland gives a pointer to an int. The int is set to a progress
	191	* indicator 0-65536, with 65536=100%.
	192	*
	193	* If the drive does not support format progress indication, we just check
	194	* the dsc bit, and return either 0 or 65536.
	195	*/
	196
07bd3f47 LT	197	static int ide_floppy_get_format_progress(ide_drive_t *drive,
	198	struct ide_atapi_pc *pc,
	199	int __user *arg)
0127854d	200	{
0df96277	201	struct ide_disk_obj *floppy = drive->driver_data;
60cfab85	202	u8 sense_buf[18];
0127854d BZ	203	int progress_indication = 0x10000;
	204
	205	if (drive->atapi_flags & IDE_AFLAG_SRFP) {
07bd3f47	206	ide_create_request_sense_cmd(drive, pc);
60cfab85	207	if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf,
b13345f3	208	pc->req_xfer))
0127854d BZ	209	return -EIO;
	210
	211	if (floppy->sense_key == 2 &&
	212	floppy->asc == 4 &&
	213	floppy->ascq == 4)
	214	progress_indication = floppy->progress_indication;
	215
	216	/* Else assume format_unit has finished, and we're at 0x10000 */
	217	} else {
	218	ide_hwif_t *hwif = drive->hwif;
	219	unsigned long flags;
	220	u8 stat;
	221
	222	local_irq_save(flags);
	223	stat = hwif->tp_ops->read_status(hwif);
	224	local_irq_restore(flags);
	225
	226	progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
	227	}
	228
	229	if (put_user(progress_indication, arg))
	230	return -EFAULT;
	231
	232	return 0;
	233	}
	234
5bb1536a BZ	235	static int ide_floppy_lockdoor(ide_drive_t drive, struct ide_atapi_pc pc,
	236	unsigned long arg, unsigned int cmd)
	237	{
0df96277	238	struct ide_disk_obj *floppy = drive->driver_data;
5bb1536a BZ	239	struct gendisk *disk = floppy->disk;
	240	int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
	241
	242	if (floppy->openers > 1)
	243	return -EBUSY;
	244
	245	ide_set_media_lock(drive, disk, prevent);
	246
	247	if (cmd == CDROMEJECT)
	248	ide_do_start_stop(drive, disk, 2);
	249
	250	return 0;
	251	}
	252
07bd3f47 LT	253	static int ide_floppy_format_ioctl(ide_drive_t drive, struct ide_atapi_pc pc,
	254	fmode_t mode, unsigned int cmd,
	255	void __user *argp)
0127854d BZ	256	{
	257	switch (cmd) {
	258	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
	259	return 0;
	260	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
07bd3f47	261	return ide_floppy_get_format_capacities(drive, pc, argp);
0127854d	262	case IDEFLOPPY_IOCTL_FORMAT_START:
badf8082	263	if (!(mode & FMODE_WRITE))
0127854d	264	return -EPERM;
07bd3f47	265	return ide_floppy_format_unit(drive, pc, (int __user *)argp);
0127854d	266	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
07bd3f47	267	return ide_floppy_get_format_progress(drive, pc, argp);
0127854d BZ	268	default:
	269	return -ENOTTY;
	270	}
	271	}
5bb1536a	272
badf8082 AV	273	int ide_floppy_ioctl(ide_drive_t drive, struct block_device bdev,
badf8082 AV	274	fmode_t mode, unsigned int cmd, unsigned long arg)
5bb1536a	275	{
5bb1536a BZ	276	struct ide_atapi_pc pc;
	277	void __user argp = (void __user )arg;
	278	int err;
	279
2a48fc0a	280	mutex_lock(&ide_floppy_ioctl_mutex);
8a6cfeb6 AB	281	if (cmd == CDROMEJECT \|\| cmd == CDROM_LOCKDOOR) {
	282	err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
	283	goto out;
	284	}
5bb1536a	285
07bd3f47	286	err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
5bb1536a	287	if (err != -ENOTTY)
8a6cfeb6	288	goto out;
5bb1536a BZ	289
	290	/*
	291	* skip SCSI_IOCTL_SEND_COMMAND (deprecated)
	292	* and CDROM_SEND_PACKET (legacy) ioctls
	293	*/
	294	if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
74f3c8af	295	err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk,
badf8082	296	mode, cmd, argp);
5bb1536a BZ	297
5bb1536a BZ	298	if (err == -ENOTTY)
1bddd9e6	299	err = generic_ide_ioctl(drive, bdev, cmd, arg);
5bb1536a	300
8a6cfeb6	301	out:
2a48fc0a	302	mutex_unlock(&ide_floppy_ioctl_mutex);
5bb1536a BZ	303	return err;
5bb1536a BZ	304	}