backing-file: clean up the API

 - Pass iocb to ctx->end_write() instead of file + pos

 - Get rid of ctx->user_file, which is redundant most of the time

 - Instead pass iocb to backing_file_splice_read and
   backing_file_splice_write

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/include/linux/backing-file.h b/include/linux/backing-file.h
index 2eed0ffb5e8f..1476a6ed1bfd 100644
--- a/include/linux/backing-file.h
+++ b/include/linux/backing-file.h
@@ -14,9 +14,8 @@
 
 struct backing_file_ctx {
 	const struct cred *cred;
-	struct file *user_file;
-	void (*accessed)(struct file *);
-	void (*end_write)(struct file *, loff_t, ssize_t);
+	void (*accessed)(struct file *file);
+	void (*end_write)(struct kiocb *iocb, ssize_t);
 };
 
 struct file *backing_file_open(const struct path *user_path, int flags,
@@ -31,13 +30,13 @@ ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter,
 ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter,
 				struct kiocb *iocb, int flags,
 				struct backing_file_ctx *ctx);
-ssize_t backing_file_splice_read(struct file *in, loff_t *ppos,
+ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb,
 				 struct pipe_inode_info *pipe, size_t len,
 				 unsigned int flags,
 				 struct backing_file_ctx *ctx);
 ssize_t backing_file_splice_write(struct pipe_inode_info *pipe,
-				  struct file *out, loff_t *ppos, size_t len,
-				  unsigned int flags,
+				  struct file *out, struct kiocb *iocb,
+				  size_t len, unsigned int flags,
 				  struct backing_file_ctx *ctx);
 int backing_file_mmap(struct file *file, struct vm_area_struct *vma,
 		      struct backing_file_ctx *ctx);