linux-kernel - [PATCH AUTOSEL 6.1 006/212] fuse: Return EPERM rather than ENOSYS from link()

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Message-Id: <20250505230624.2692522-6-sashal@kernel.org>
Date: Mon,  5 May 2025 19:02:58 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Matt Johnston <matt@...econstruct.com.au>,
	Miklos Szeredi <mszeredi@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	miklos@...redi.hu,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 006/212] fuse: Return EPERM rather than ENOSYS from link()

From: Matt Johnston <matt@...econstruct.com.au>

[ 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@...econstruct.com.au>
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/fuse/dir.c | 2 ++
 1 file changed, 2 insertions(+)

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;
 }
 
-- 
2.39.5