[PATCH 12/21] ide-floppy: factor out ioctl handlers from idefloppy_ioctl()

[Borislav Petkov]

By passing idefloppy_floppy_t *floppy to the factored out functions, we get
rid of (almost) all local vars so stack usage should be at minimum here. Also,
we merge idefloppy_begin_format() into idefloppy_format_start() since it is its
only user.

Also,
- remove unneeded scsi ioctl chunk
- rename idefloppy_format_start to idefloppy_format_unit

Signed-off-by: Borislav Petkov <bbpetkov@xxxxxxxx>
---
 drivers/ide/ide-floppy.c |  169 +++++++++++++++++++++------------------------
 1 files changed, 79 insertions(+), 90 deletions(-)

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 5d612e7..a33d651 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -1244,44 +1244,6 @@ static int idefloppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
 }
 
 /*
- * 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.
- */
-
-static int idefloppy_begin_format(ide_drive_t *drive, int __user *arg)
-{
-	int blocks;
-	int length;
-	int flags;
-	idefloppy_pc_t pc;
-
-	if (get_user(blocks, arg) ||
-	    get_user(length, arg+1) ||
-	    get_user(flags, arg+2)) {
-		return (-EFAULT);
-	}
-
-	(void) idefloppy_get_sfrp_bit(drive);
-	idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
-	if (idefloppy_queue_pc_tail(drive, &pc)) {
-                return (-EIO);
-	}
-
-	return (0);
-}
-
-/*
  * Get ATAPI_FORMAT_UNIT progress indication.
  *
  * Userland gives a pointer to an int.  The int is set to a progress
@@ -1623,6 +1585,82 @@ static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 	return 0;
 }
 
+static int idefloppy_lockdoor(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc,
+		unsigned long arg, unsigned int cmd)
+{
+	if (floppy->openers > 1)
+		return -EBUSY;
+
+	/* The IOMEGA Clik! Drive doesn't support this command -
+	 * no room for an eject mechanism */
+	if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
+		int prevent = (arg) ? 1 : 0;
+
+		if (cmd == CDROMEJECT)
+			prevent = 0;
+
+		idefloppy_create_prevent_cmd(pc, prevent);
+		(void) idefloppy_queue_pc_tail(floppy->drive, pc);
+	}
+
+	if (cmd == CDROMEJECT) {
+		idefloppy_create_start_stop_cmd(pc, 2);
+		(void) idefloppy_queue_pc_tail(floppy->drive, pc);
+	}
+
+	return 0;
+}
+
+static int idefloppy_format_unit(idefloppy_floppy_t *floppy, unsigned long arg)
+{
+	int blocks, length, flags, err = 0;
+	int __user *argp = (int __user *)arg;
+	idefloppy_pc_t pc;
+
+	if (floppy->openers > 1) {
+		/* Don't format if someone is using the disk */
+		clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+		return -EBUSY;
+	}
+
+	set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+
+	/*
+	 * 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, argp) ||
+			get_user(length, argp+1) ||
+			get_user(flags, argp+2)) {
+		err = -EFAULT;
+		goto out;
+	}
+
+	(void) idefloppy_get_sfrp_bit(floppy->drive);
+	idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
+
+	if (idefloppy_queue_pc_tail(floppy->drive, &pc)) {
+		err = -EIO;
+		goto out;
+	}
+
+out:
+	if (err)
+		clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+	return err;
+}
+
 static int idefloppy_ioctl(struct inode *inode, struct file *file,
 			unsigned int cmd, unsigned long arg)
 {
@@ -1630,75 +1668,26 @@ static int idefloppy_ioctl(struct inode *inode, struct file *file,
 	struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
 	ide_drive_t *drive = floppy->drive;
 	void __user *argp = (void __user *)arg;
-	int err;
-	int prevent = (arg) ? 1 : 0;
 	idefloppy_pc_t pc;
 
 	switch (cmd) {
 	case CDROMEJECT:
-		prevent = 0;
 		/* fall through */
 	case CDROM_LOCKDOOR:
-		if (floppy->openers > 1)
-			return -EBUSY;
-
-		/* The IOMEGA Clik! Drive doesn't support this command - no room
-		 * for an eject mechanism */
-                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
-			idefloppy_create_prevent_cmd(&pc, prevent);
-			(void) idefloppy_queue_pc_tail(drive, &pc);
-		}
-		if (cmd == CDROMEJECT) {
-			idefloppy_create_start_stop_cmd(&pc, 2);
-			(void) idefloppy_queue_pc_tail(drive, &pc);
-		}
-		return 0;
+		return idefloppy_lockdoor(floppy, &pc, arg, cmd);
 	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
 		return 0;
 	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
 		return idefloppy_get_format_capacities(drive, argp);
 	case IDEFLOPPY_IOCTL_FORMAT_START:
-
 		if (!(file->f_mode & 2))
 			return -EPERM;
-
-		if (floppy->openers > 1) {
-			/* Don't format if someone is using the disk */
-
-			clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
-				  &floppy->flags);
-			return -EBUSY;
-		}
-
-		set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
-
-		err = idefloppy_begin_format(drive, argp);
-		if (err)
-			clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
-		return err;
-		/*
-		 * Note, the bit will be cleared when the device is closed. This
-		 * is the cleanest way to handle the situation where the drive
-		 * does not support format progress reporting.
-		 */
+		return idefloppy_format_unit(floppy, arg);
 	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
 		return idefloppy_get_format_progress(drive, argp);
 	}
 
-	/*
-	 * 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(file, bdev->bd_disk->queue,
-					bdev->bd_disk, cmd, argp);
-	else
-		err = -ENOTTY;
-
-	if (err == -ENOTTY)
-		err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
-
-	return err;
+	return generic_ide_ioctl(drive, file, bdev, cmd, arg);
 }
 
 static int idefloppy_media_changed(struct gendisk *disk)
-- 
1.5.3.7

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