ide-floppy: factor out ioctl handlers from idefloppy_ioctl()

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, rename idefloppy_format_start() to idefloppy_format_unit().
Finally, rename the reworked functions to ide_floppy..().

Bart
- minor CodingStyle fixup
Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-floppy.c

@@ -1289,44 +1289,6 @@ static int ide_floppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
 	return (0);
 }
 
-/*
-** 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.
 **
@@ -1678,64 +1640,105 @@ static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 	return 0;
 }
 
-static int idefloppy_ioctl(struct inode *inode, struct file *file,
-			unsigned int cmd, unsigned long arg)
+static int ide_floppy_lockdoor(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc,
+			       unsigned long arg, unsigned int cmd)
 {
-	struct block_device *bdev = inode->i_bdev;
-	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 */
+	/* 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);
+		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(drive, &pc);
+		idefloppy_create_start_stop_cmd(pc, 2);
+		(void) idefloppy_queue_pc_tail(floppy->drive, pc);
 	}
+
 	return 0;
-	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
-		return 0;
-	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
-		return ide_floppy_get_format_capacities(drive, argp);
-	case IDEFLOPPY_IOCTL_FORMAT_START:
+}
 
-		if (!(file->f_mode & 2))
-			return -EPERM;
+static int ide_floppy_format_unit(idefloppy_floppy_t *floppy,
+				  int __user *arg)
+{
+	int blocks, length, flags, err = 0;
+	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);
+		clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
 		return -EBUSY;
 	}
 
 	set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
 
-		err = idefloppy_begin_format(drive, argp);
+	/*
+	 * 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;
+	}
+
+	(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;
+
+out:
 	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.
-		*/
+}
+
+
+static int idefloppy_ioctl(struct inode *inode, struct file *file,
+			unsigned int cmd, unsigned long arg)
+{
+	struct block_device *bdev = inode->i_bdev;
+	struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
+	ide_drive_t *drive = floppy->drive;
+	idefloppy_pc_t pc;
+	void __user *argp = (void __user *)arg;
+	int err;
+
+	switch (cmd) {
+	case CDROMEJECT:
+		/* fall through */
+	case CDROM_LOCKDOOR:
+		return ide_floppy_lockdoor(floppy, &pc, arg, cmd);
+	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
+		return 0;
+	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
+		return ide_floppy_get_format_capacities(drive, argp);
+	case IDEFLOPPY_IOCTL_FORMAT_START:
+		if (!(file->f_mode & 2))
+			return -EPERM;
+
+		return ide_floppy_format_unit(floppy, (int __user *)arg);
 	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
 		return idefloppy_get_format_progress(drive, argp);
 	}