From: Matt Johnston <matt@codeconstruct.com.au>
Date: Fri, 14 Feb 2025 01:17:53 +0000 (+0800)
Subject: fuse: Return EPERM rather than ENOSYS from link()
X-Git-Tag: v6.1.141~302
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f706cb4e370322273c20e30f10750f88553af135;p=thirdparty%2Fkernel%2Fstable.git

fuse: Return EPERM rather than ENOSYS from link()

[ Upstream commit 8344213571b2ac8caf013cfd3b37bc3467c3a893 ]

link() is documented to return EPERM when a filesystem doesn't support
the operation, return that instead.

Link: https://github.com/libfuse/libfuse/issues/925
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index c431abbf48e66..0dbacdd7bb0d8 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1068,6 +1068,8 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
 	else if (err == -EINTR)
 		fuse_invalidate_attr(inode);
 
+	if (err == -ENOSYS)
+		err = -EPERM;
 	return err;
 }