f2fs: clean up f2fs_ioctl functions

This patch cleans up f2fs_ioctl functions for better readability.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -805,90 +805,102 @@ static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
 		return flags & F2FS_OTHER_FLMASK;
 }
 
-long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
 	struct f2fs_inode_info *fi = F2FS_I(inode);
-	unsigned int flags;
-	int ret;
+	unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
+	return put_user(flags, (int __user *)arg);
+}
 
-	switch (cmd) {
-	case F2FS_IOC_GETFLAGS:
-		flags = fi->i_flags & FS_FL_USER_VISIBLE;
-		return put_user(flags, (int __user *) arg);
-	case F2FS_IOC_SETFLAGS:
-	{
-		unsigned int oldflags;
+static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct f2fs_inode_info *fi = F2FS_I(inode);
+	unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
+	unsigned int oldflags;
+	int ret;
 
-		ret = mnt_want_write_file(filp);
-		if (ret)
-			return ret;
+	ret = mnt_want_write_file(filp);
+	if (ret)
+		return ret;
 
-		if (!inode_owner_or_capable(inode)) {
-			ret = -EACCES;
-			goto out;
-		}
+	if (!inode_owner_or_capable(inode)) {
+		ret = -EACCES;
+		goto out;
+	}
 
-		if (get_user(flags, (int __user *) arg)) {
-			ret = -EFAULT;
-			goto out;
-		}
+	if (get_user(flags, (int __user *)arg)) {
+		ret = -EFAULT;
+		goto out;
+	}
 
-		flags = f2fs_mask_flags(inode->i_mode, flags);
+	flags = f2fs_mask_flags(inode->i_mode, flags);
 
-		mutex_lock(&inode->i_mutex);
+	mutex_lock(&inode->i_mutex);
 
-		oldflags = fi->i_flags;
+	oldflags = fi->i_flags;
 
-		if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
-			if (!capable(CAP_LINUX_IMMUTABLE)) {
-				mutex_unlock(&inode->i_mutex);
-				ret = -EPERM;
-				goto out;
-			}
+	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
+		if (!capable(CAP_LINUX_IMMUTABLE)) {
+			mutex_unlock(&inode->i_mutex);
+			ret = -EPERM;
+			goto out;
 		}
+	}
 
-		flags = flags & FS_FL_USER_MODIFIABLE;
-		flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
-		fi->i_flags = flags;
-		mutex_unlock(&inode->i_mutex);
+	flags = flags & FS_FL_USER_MODIFIABLE;
+	flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
+	fi->i_flags = flags;
+	mutex_unlock(&inode->i_mutex);
 
-		f2fs_set_inode_flags(inode);
-		inode->i_ctime = CURRENT_TIME;
-		mark_inode_dirty(inode);
+	f2fs_set_inode_flags(inode);
+	inode->i_ctime = CURRENT_TIME;
+	mark_inode_dirty(inode);
 out:
-		mnt_drop_write_file(filp);
-		return ret;
-	}
-	case FITRIM:
-	{
-		struct super_block *sb = inode->i_sb;
-		struct request_queue *q = bdev_get_queue(sb->s_bdev);
-		struct fstrim_range range;
-		int ret = 0;
+	mnt_drop_write_file(filp);
+	return ret;
+}
 
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
+static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct super_block *sb = inode->i_sb;
+	struct request_queue *q = bdev_get_queue(sb->s_bdev);
+	struct fstrim_range range;
+	int ret;
 
-		if (!blk_queue_discard(q))
-			return -EOPNOTSUPP;
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
 
-		if (copy_from_user(&range, (struct fstrim_range __user *)arg,
-					sizeof(range)))
-			return -EFAULT;
+	if (!blk_queue_discard(q))
+		return -EOPNOTSUPP;
 
-		range.minlen = max((unsigned int)range.minlen,
-				   q->limits.discard_granularity);
-		ret = f2fs_trim_fs(F2FS_SB(sb), &range);
-		if (ret < 0)
-			return ret;
+	if (copy_from_user(&range, (struct fstrim_range __user *)arg,
+				sizeof(range)))
+		return -EFAULT;
 
-		if (copy_to_user((struct fstrim_range __user *)arg, &range,
-					sizeof(range)))
-			return -EFAULT;
+	range.minlen = max((unsigned int)range.minlen,
+				q->limits.discard_granularity);
+	ret = f2fs_trim_fs(F2FS_SB(sb), &range);
+	if (ret < 0)
+		return ret;
 
-		return 0;
-	}
+	if (copy_to_user((struct fstrim_range __user *)arg, &range,
+				sizeof(range)))
+		return -EFAULT;
+	return 0;
+}
+
+long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case F2FS_IOC_GETFLAGS:
+		return f2fs_ioc_getflags(filp, arg);
+	case F2FS_IOC_SETFLAGS:
+		return f2fs_ioc_setflags(filp, arg);
+	case FITRIM:
+		return f2fs_ioc_fitrim(filp, arg);
 	default:
 		return -ENOTTY;
 	}