fuse: disable the combination of passthrough and writeback cache

Current design and handling of passthrough is without fuse
caching and with that FUSE_WRITEBACK_CACHE is conflicting.

Fixes: 7dc4e97 ("fuse: introduce FUSE_PASSTHROUGH capability")
Cc: [email protected] # v6.9
Signed-off-by: Bernd Schubert <[email protected]>
Acked-by: Amir Goldstein <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>

Author: bsbernd

fs/fuse/inode.c

@@ -1332,11 +1332,16 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
 			 * on a stacked fs (e.g. overlayfs) themselves and with
 			 * max_stack_depth == 1, FUSE fs can be stacked as the
 			 * underlying fs of a stacked fs (e.g. overlayfs).
+			 *
+			 * Also don't allow the combination of FUSE_PASSTHROUGH
+			 * and FUSE_WRITEBACK_CACHE, current design doesn't handle
+			 * them together.
 			 */
 			if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH) &&
 			    (flags & FUSE_PASSTHROUGH) &&
 			    arg->max_stack_depth > 0 &&
-			    arg->max_stack_depth <= FILESYSTEM_MAX_STACK_DEPTH) {
+			    arg->max_stack_depth <= FILESYSTEM_MAX_STACK_DEPTH &&
+			    !(flags & FUSE_WRITEBACK_CACHE))  {
 				fc->passthrough = 1;
 				fc->max_stack_depth = arg->max_stack_depth;
 				fm->sb->s_stack_depth = arg->max_stack_depth;