[PATCH v2 1/2] fuse: Move ioctl length calculation to a separate function

[Chirantan Ekbote <chirantan@chromium.org>]

This will make it more readable when we add support for more ioctls.

Signed-off-by: Chirantan Ekbote <chirantan@chromium.org>
---
 fs/fuse/file.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c03034e8c1529..69cffb77a0b25 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2703,6 +2703,20 @@ static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst,
 	return 0;
 }
 
+static int fuse_get_ioctl_len(unsigned int cmd, unsigned long arg, size_t *len)
+{
+	switch (cmd) {
+	case FS_IOC_GETFLAGS:
+	case FS_IOC_SETFLAGS:
+		*len = sizeof(int);
+		break;
+	default:
+		*len = _IOC_SIZE(cmd);
+		break;
+	}
+
+	return 0;
+}
 
 /*
  * For ioctls, there is no generic way to determine how much memory
@@ -2802,16 +2816,9 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 		struct iovec *iov = iov_page;
 
 		iov->iov_base = (void __user *)arg;
-
-		switch (cmd) {
-		case FS_IOC_GETFLAGS:
-		case FS_IOC_SETFLAGS:
-			iov->iov_len = sizeof(int);
-			break;
-		default:
-			iov->iov_len = _IOC_SIZE(cmd);
-			break;
-		}
+		err = fuse_get_ioctl_len(cmd, arg, &iov->iov_len);
+		if (err)
+			goto out;
 
 		if (_IOC_DIR(cmd) & _IOC_WRITE) {
 			in_iov = iov;
-- 
2.29.2.576.ga3fc446d84-goog