nfsd3: Check write permission after checking existence

When creating a file that already exists in a read-only directory with
O_EXCL, the NFSv3 server returns EACCES rather than EEXIST (which local
files and the NFSv4 server return).  Fix this by checking the MAY_CREATE
permission only if the file does not exist.  Since this already happens
in do_nfsd_create, the check in nfsd3_proc_create can simply be removed.

Signed-off-by: Ross Lagerwall <rosslagerwall@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index fa2525b2e9d7..fc51f7f6b36d 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -223,11 +223,6 @@ nfsd3_proc_create(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
         attr   = &argp->attrs;
 
-        /* Get the directory inode */
-        nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_CREATE);
-        if (nfserr)
-                RETURN_STATUS(nfserr);
-
         /* Unfudge the mode bits */
         attr->ia_mode &= ~S_IFMT;
         if (!(attr->ia_valid & ATTR_MODE)) {