Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 304 insertions, 0 deletions

diff --git a/drivers/ide/ide-floppy_ioctl.c b/drivers/ide/ide-floppy_ioctl.c
new file mode 100644
index 000000000..40a2ebe34
--- /dev/null
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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_blk_ioctl(bdev, mode, cmd, argp);
+
+	if (err == -ENOTTY)
+		err = generic_ide_ioctl(drive, bdev, cmd, arg);
+
+out:
+	mutex_unlock(&ide_floppy_ioctl_mutex);
+	return err;
+}