ANDROID: fuse-bpf: Use fuse_bpf_args in uapi

fuse_args is not suitable for use in the uapi - it is not stable, and
contains internal pointers. Replace with stable equivalent.

Test: atest ScopedStorageDeviceTest passes
Bug: 202785178
Change-Id: I27d5ae0d7e0aaf30c51f3b97124737841605ae69

1 files changed, 28 insertions, 22 deletions

diff --git a/include/fuse_kernel.h b/include/fuse_kernel.h
index 70278fa..b1f1e1d 100644
--- a/include/fuse_kernel.h
+++ b/include/fuse_kernel.h
@@ -874,38 +874,44 @@ struct fuse_copy_file_range_in {
 #ifdef __KERNEL__
 struct fuse_mount;
 
+/*
+ * Fuse BPF Args
+ *
+ * Used to communicate with bpf programs to allow checking or altering certain values.
+ * The end_offset allows the bpf verifier to check boundaries statically. This reflects
+ * the ends of the buffer. size shows the length that was actually used.
+ *
+ */
+
 /** One input argument of a request */
-struct fuse_in_arg {
-  unsigned size;
+struct fuse_bpf_in_arg {
+  uint32_t size;
   const void *value;
+  const void *end_offset;
 };
 
 /** One output argument of a request */
-struct fuse_arg {
-  unsigned size;
+struct fuse_bpf_arg {
+  uint32_t size;
   void *value;
+  void *end_offset;
 };
 
-struct fuse_args {
+#define FUSE_MAX_IN_ARGS 5
+#define FUSE_MAX_OUT_ARGS 3
+
+#define FUSE_BPF_FORCE (1 << 0)
+#define FUSE_BPF_OUT_ARGVAR (1 << 6)
+
+struct fuse_bpf_args {
   uint64_t nodeid;
   uint32_t opcode;
-  unsigned short in_numargs;
-  unsigned short out_numargs;
-  int force:1;
-  int noreply:1;
-  int nocreds:1;
-  int in_pages:1;
-  int out_pages:1;
-  int out_argvar:1;
-  int page_zeroing:1;
-  int page_replace:1;
-  int may_block:1;
-  struct fuse_in_arg in_args[5];
-  struct fuse_arg out_args[3];
-  void (*end)(struct fuse_mount *fm, struct fuse_args *args, int error);
-
-  /* Path used for completing d_canonical_path */
-  struct path *canonical_path;
+  uint32_t error_in;
+  uint32_t in_numargs;
+  uint32_t out_numargs;
+  uint32_t flags;
+  struct fuse_bpf_in_arg in_args[FUSE_MAX_IN_ARGS];
+  struct fuse_bpf_arg out_args[FUSE_MAX_OUT_ARGS];
 };
 #endif