[PATCH 1/2] NFS: Import NFS3ERR definitions

[Chuck Lever <cel@kernel.org>]

enum nfs_stat in uapi/linux/nfs.h collects the on-the-wire status
codes for every NFS version under version-agnostic NFSERR_* names.
The in-kernel NFS client and server reference these names
internally, which drags uapi/linux/nfs.h into many translation
units that need nothing else from that header.

xdrgen conversion will provide spec-based definitions of the NFS
status enum constants. Replacing the existing internal references
with version-specific names requires a version-specific spelling
for each code that NFSD uses.

linux/nfs4.h already supplies the NFSv4 codes, but NFSv3 has no
counterpart header, and not every NFSv3 code has an NFS4ERR_*
spelling: NFSERR_NOT_SYNC (10002) and NFSERR_REMOTE (71) have no
NFSv4 equivalent at all, and NFSERR_JUKEBOX (10008) appears in
NFSv4 as NFS4ERR_DELAY.

Introduce the NFSv3 status codes as NFS3ERR_* in linux/nfs3.h so a
subsequent patch can respell NFSD's status definitions without
relying on uapi/linux/nfs.h.

Signed-off-by: Chuck Lever <cel@kernel.org>
---
 include/linux/nfs3.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/include/linux/nfs3.h b/include/linux/nfs3.h
index 1d18da0860d5..b6539a75edea 100644
--- a/include/linux/nfs3.h
+++ b/include/linux/nfs3.h
@@ -7,6 +7,41 @@
 
 #include <uapi/linux/nfs3.h>
 
+/*
+ * NFSv3 error status values.
+ * See RFC 1813 Section 2.5
+ */
+enum {
+	NFS3ERR_PERM		= 1,
+	NFS3ERR_NOENT		= 2,
+	NFS3ERR_IO		= 5,
+	NFS3ERR_NXIO		= 6,
+	NFS3ERR_ACCES		= 13,
+	NFS3ERR_EXIST		= 17,
+	NFS3ERR_XDEV		= 18,
+	NFS3ERR_NODEV		= 19,
+	NFS3ERR_NOTDIR		= 20,
+	NFS3ERR_ISDIR		= 21,
+	NFS3ERR_INVAL		= 22,
+	NFS3ERR_FBIG		= 27,
+	NFS3ERR_NOSPC		= 28,
+	NFS3ERR_ROFS		= 30,
+	NFS3ERR_MLINK		= 31,
+	NFS3ERR_NAMETOOLONG	= 63,
+	NFS3ERR_NOTEMPTY	= 66,
+	NFS3ERR_DQUOT		= 69,
+	NFS3ERR_STALE		= 70,
+	NFS3ERR_REMOTE		= 71,
+	NFS3ERR_BADHANDLE	= 10001,
+	NFS3ERR_NOT_SYNC	= 10002,
+	NFS3ERR_BAD_COOKIE	= 10003,
+	NFS3ERR_NOTSUPP		= 10004,
+	NFS3ERR_TOOSMALL	= 10005,
+	NFS3ERR_SERVERFAULT	= 10006,
+	NFS3ERR_BADTYPE		= 10007,
+	NFS3ERR_JUKEBOX		= 10008,
+};
+
 enum nfs3_stable_how {
 	NFS_UNSTABLE = 0,
 	NFS_DATA_SYNC = 1,
-- 
2.55.0