[PATCH 6.10 038/375] fuse: disable the combination of passthrough and writeback cache

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6.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bernd Schubert <bschubert@xxxxxxx>

commit 3ab394b363c5fd14b231e335fb6746ddfb93aaaa upstream.

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

Fixes: 7dc4e97a4f9a ("fuse: introduce FUSE_PASSTHROUGH capability")
Cc: stable@xxxxxxxxxx # v6.9
Signed-off-by: Bernd Schubert <bschubert@xxxxxxx>
Acked-by: Amir Goldstein <amir73il@xxxxxxxxx>
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/fuse/inode.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1336,11 +1336,16 @@ static void process_init_reply(struct fu
 			 * 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;






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