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Commit 8505c8bf authored by Steve French's avatar Steve French
Browse files

smb3: if server does not support posix do not allow posix mount option 



If user specifies "posix" on an SMB3.11 mount, then fail the mount
if server does not return the POSIX negotiate context indicating
support for posix.

Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
Reviewed-by: default avatarAurelien Aptel <aaptel@suse.com>
parent cbedeadf

fs/cifs/connect.c

+6 −2
Original line number Diff line number Diff line
@@ -3031,11 +3031,15 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info) 
	}



#ifdef CONFIG_CIFS_SMB311

	if ((volume_info->linux_ext) && (ses->server->posix_ext_supported)) {

		if (ses->server->vals->protocol_id == SMB311_PROT_ID) {

	if (volume_info->linux_ext) {

		if (ses->server->posix_ext_supported) {

			tcon->posix_extensions = true;

			printk_once(KERN_WARNING

				"SMB3.11 POSIX Extensions are experimental\n");

		} else {

			cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions.\n");

			rc = -EOPNOTSUPP;

			goto out_fail;

		}

	}

#endif /* 311 */