Error status codes for mount point status

Exit code	Errno name	Description	NFS scenario	CIFS/SMB scenario
0	Success	Operation completed successfully	Mount succeeded	Mount succeeded
1	EPERM	Operation not permitted	No root privileges	No root privileges
2	ENOENT	No such file or directory	Mount point is missing	Mount point or share is missing
5	EIO	Input/output error	Generic I/O error	Generic I/O error
13	EACCES	Permission denied	Export permission denied	Authentication failed
16	EBUSY	Device or resource busy	Mount point in use	Mount point in use
20	ENOTDIR	Not a directory	Mount point is not a directory	Mount point is not a directory
22	EINVAL	Invalid argument	Invalid mount options	Invalid mount options
101	ENETUNREACH	Network unreachable	Cannot reach NFS server	Cannot reach SMB server
110	ETIMEDOUT	Connection timed out	NFS server not responding	SMB server not responding
111	ECONNREFUSED	Connection refused	NFS service not running	SMB service not running
112	EHOSTDOWN	Host is down	NFS server down	SMB server down
113	EHOSTUNREACH	No route to host	Network routing issue	Network routing issue

Exit code	Errno name	Description	Common scenario
6	ENXIO	No such device or address	NFS export does not exist
32	EPIPE	Broken pipe	Connection to NFS server broken
74	EBADMSG	Bad message	RPC message format error
116	ESTALE	Stale file handle	NFS file handle no longer valid
118	ENOTSUPP	Protocol not supported	Unsupported NFS version
121	EREMOTEIO	Remote I/O error	I/O error on NFS server
122	EDQUOT	Quota exceeded	User quota exceeded on NFS server

Exit code	Errno name	Description	Common scenario
95	EOPNOTSUPP	Operation not supported	Unsupported CIFS protocol version
121	EREMOTEIO	Remote I/O error	Windows error (often authentication)
126	ENOKEY	Required key not available	Missing Kerberos ticket
127	EKEYEXPIRED	Key has expired	Kerberos ticket expired
128	EKEYREVOKED	Key has been revoked	Credentials revoked