From f68970cd235a7e14026ca0f6240428bbebe8223b Mon Sep 17 00:00:00 2001 From: Bernd Schubert Date: Sat, 22 Mar 2025 23:57:55 +0100 Subject: fuse: Fix want flag conversion 32-bit conn->want flags been left to be ABI compatible to 3.10, even though the so version was changed. The more recent way is to use fuse_set_feature_flag(), which will use conn->want_ext. Given that we now have two flags (want and want_ext), we need to convert and that brought several issues - If the application sets conn->want, that needs to be set into the lower 32 bit of conn->want_ext. As the application might actually unset values, it really has to be a copy and not just 'or' - fixed now. - convert_to_conn_want_ext() actually needs to check for _modified_ conn->want and conn->want_ext - convert_to_conn_want_ext() must consider being called from high and lowlevel interfact, with different want_ext_default and want_default values. It is only a failure, if the application changed both, conn->want and conn->want_ext. This function was failing in issue #1171, because high level fuse_fs_init() was changing values and then lowlevel do_init() was incorrectly failing on that. This also adds a new test (test_want_conversion) and sets values into example/{hello.c,hello_ll.c} Also some more internal users of conn->want are converted to fuse_{set,unset}_feature_flag(). Closes: https://github.com/libfuse/libfuse/issues/1171 Signed-off-by: Bernd Schubert --- test/test_write_cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'test/test_write_cache.c') diff --git a/test/test_write_cache.c b/test/test_write_cache.c index 2e9c671..2b5b4f3 100644 --- a/test/test_write_cache.c +++ b/test/test_write_cache.c @@ -66,7 +66,7 @@ static void tfs_init(void *userdata, struct fuse_conn_info *conn) if (options.writeback) { assert(fuse_get_feature_flag(conn, FUSE_CAP_WRITEBACK_CACHE)); - conn->want |= FUSE_CAP_WRITEBACK_CACHE; + fuse_set_feature_flag(conn, FUSE_CAP_WRITEBACK_CACHE); } } -- cgit v1.2.3