fuse2fs: disable renameat2

Apparently fuse munged rename and renameat2 together into the same
upcall, so we actually have to filter out nonzero flags because
otherwise we do a regular rename for a RENAME_EXCHANGE/WHITEOUT, which
is not what the user asked for.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/174553065177.1160461.684615549721279410.stgit@frogsfrogsfrogs
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
(cherry picked from commit b431abbc8fe0fd1de4e414aae3520c4c19411048)

diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index d123eebb151123e32385a1bb16b586526028fd2a..36e1173e20288ab666398348fc250e8e2c8dcb13 100644 (file)
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -1405,6 +1405,12 @@ static int op_rename(const char *from, const char *to
        struct update_dotdot ud;
        int ret = 0;
 
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
+       /* renameat2 is not supported */
+       if (flags)
+               return -ENOSYS;
+#endif
+
        FUSE2FS_CHECK_CONTEXT(ff);
        fs = ff->fs;
        dbg_printf("%s: renaming %s to %s\n", __func__, from, to);