cifs: fix smb1 mount regression

cifs.ko maps NT_STATUS_NOT_FOUND to -EIO when SMB1 servers couldn't
resolve referral paths.  Proceed to tree connect when we get -EIO from
dfs_get_referral() as well.

Reported-by: Kris Karas (Bug Reporting) <[email protected]>
Tested-by: Woody Suwalski <[email protected]>
Fixes: 8e35541 ("cifs: fix sharing of DFS connections")
Cc: [email protected] # v6.2+
Signed-off-by: Paulo Alcantara (SUSE) <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: Paulo Alcantara

fs/cifs/dfs.c

@@ -303,7 +303,7 @@ int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
 	if (!nodfs) {
 		rc = dfs_get_referral(mnt_ctx, ctx->UNC + 1, NULL, NULL);
 		if (rc) {
-			if (rc != -ENOENT && rc != -EOPNOTSUPP)
+			if (rc != -ENOENT && rc != -EOPNOTSUPP && rc != -EIO)
 				goto out;
 			nodfs = true;
 		}