[PATCH] knfsd: query filesystem for NFSv4 getattr of FATTR4_MAXNAME

[J . Bruce Fields]

mainline: a16e92edcd0a2846455a30823e1bac964e743baa

Without this we always return 2^32-1 as the the maximum namelength.

Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxxxxxx>
Signed-off-by: Andreas Gruenbacher <agruen@xxxxxxx>
CC: Oliver Pinter <oliver.pntr@xxxxxxxxx>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 15809df..0898aec 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1453,7 +1453,8 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct
svc_export *exp,
 	err = vfs_getattr(exp->ex_mnt, dentry, &stat);
 	if (err)
 		goto out_nfserr;
-	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
+	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
+			FATTR4_WORD0_MAXNAME)) ||
 	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
 		       FATTR4_WORD1_SPACE_TOTAL))) {
 		err = vfs_statfs(dentry, &statfs);
@@ -1699,7 +1700,7 @@ out_acl:
 	if (bmval0 & FATTR4_WORD0_MAXNAME) {
 		if ((buflen -= 4) < 0)
 			goto out_resource;
-		WRITE32(~(u32) 0);
+		WRITE32(statfs.f_namelen);
 	}
 	if (bmval0 & FATTR4_WORD0_MAXREAD) {
 		if ((buflen -= 8) < 0)