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fuse: disable the combination of passthrough and writeback cache

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

Fixes: 7dc4e97a4f ("fuse: introduce FUSE_PASSTHROUGH capability")
Cc: stable@kernel.org # v6.9
Signed-off-by: Bernd Schubert <bschubert@ddn.com>
Acked-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Bernd Schubert 2024-07-03 19:30:20 +02:00 committed by Miklos Szeredi
parent f7790d6778
commit 3ab394b363
1 changed files with 6 additions and 1 deletions
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7
fs/fuse/inode.c
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@ -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;