[RFC,v4,07/15] fuse: Add buffer offset for uring into fuse_copy_state

Commit Message

Bernd Schubert Oct. 16, 2024, 12:05 a.m. UTC

This is to know the size of the overall copy.

Signed-off-by: Bernd Schubert <[e-mail]>
---
 fs/fuse/dev.c        | 13 ++++++++++++-
 fs/fuse/fuse_dev_i.h |  5 +++++
 2 files changed, 17 insertions(+), 1 deletion(-)

Patch

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index dc4e0f787159a0ce28d29d410f23120aa55cad53..12836b44de9164e750f2a5f4c4d78c5c934a32b4 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -738,6 +738,9 @@  static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size)
 	*size -= ncpy;
 	cs->len -= ncpy;
 	cs->offset += ncpy;
+	if (cs->is_uring)
+		cs->ring.offset += ncpy;
+
 	return ncpy;
 }
 
@@ -1856,7 +1859,15 @@  static struct fuse_req *request_find(struct fuse_pqueue *fpq, u64 unique)
 int fuse_copy_out_args(struct fuse_copy_state *cs, struct fuse_args *args,
 		       unsigned nbytes)
 {
-	unsigned reqsize = sizeof(struct fuse_out_header);
+
+	unsigned int reqsize = 0;
+
+	/*
+	 * Uring has the out header outside of args
+	 * XXX: This uring exception will probably change
+	 */
+	if (!cs->is_uring)
+		reqsize = sizeof(struct fuse_out_header);
 
 	reqsize += fuse_len_args(args->out_numargs, args->out_args);
 
diff --git a/fs/fuse/fuse_dev_i.h b/fs/fuse/fuse_dev_i.h
index f36e304cd62c8302aed95de89926fc894f602cfd..7ecb103af6f0feca99eb8940872c6a5ccf2e5186 100644
--- a/fs/fuse/fuse_dev_i.h
+++ b/fs/fuse/fuse_dev_i.h
@@ -28,6 +28,11 @@  struct fuse_copy_state {
 	unsigned int len;
 	unsigned int offset;
 	unsigned int move_pages:1;
+	unsigned int is_uring:1;
+	struct {
+		/* overall offset with the user buffer */
+		unsigned int offset;
+	} ring;
 };
 
 static inline struct fuse_dev *fuse_get_dev(struct file *file)