1 files changed, 18 insertions, 6 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 5bb9738362d5..4f6fe6b575a8 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1474,18 +1474,21 @@ static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
 	struct block_device *bdev, const struct iovec *iov, loff_t offset,
 	unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
-	int needs_special_locking);
+	int lock_type);
+
+enum {
+	DIO_LOCKING = 1, /* need locking between buffered and direct access */
+	DIO_NO_LOCKING,  /* bdev; no locking at all between buffered/direct */
+	DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
+};
 
-/*
- * For filesystems which need locking between buffered and direct access
- */
 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
 	struct inode *inode, struct block_device *bdev, const struct iovec *iov,
 	loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
 	dio_iodone_t end_io)
 {
 	return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
-				nr_segs, get_blocks, end_io, 1);
+				nr_segs, get_blocks, end_io, DIO_LOCKING);
 }
 
 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
@@ -1494,7 +1497,16 @@ static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
 	dio_iodone_t end_io)
 {
 	return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
-				nr_segs, get_blocks, end_io, 0);
+				nr_segs, get_blocks, end_io, DIO_NO_LOCKING);
+}
+
+static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
+	struct inode *inode, struct block_device *bdev, const struct iovec *iov,
+	loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
+	dio_iodone_t end_io)
+{
+	return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
+				nr_segs, get_blocks, end_io, DIO_OWN_LOCKING);
 }
 
 extern struct file_operations generic_ro_fops;