[PATCH 5/9] cifs: Check if server supports EAs before trying to set it for WSL

[Pali Rohár]

WSL special files store information into EAs. When EAs are not supported
on the server filesystem then fast fail in mknod_wsl() function.

Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
---
 fs/smb/client/reparse.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
index 233a445ba811..0829f5373a38 100644
--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -683,6 +683,13 @@ static int mknod_wsl(unsigned int xid, struct inode *inode,
 	struct kvec reparse_iov, xattr_iov;
 	int rc;
 
+	/*
+	 * WSL special files store information into EAs. When EAs are not
+	 * supported on the server filesystem then fast fail.
+	 */
+	if (!(le32_to_cpu(tcon->fsAttrInfo.Attributes) & FILE_SUPPORTS_EXTENDED_ATTRIBUTES))
+		return -EOPNOTSUPP;
+
 	rc = wsl_set_reparse_buf(&buf, mode, symname, cifs_sb, &reparse_iov);
 	if (rc)
 		return rc;
-- 
2.20.1