nfsd: clean up nfsd_mode_check()
Add some more comments, simplify logic, do & S_IFMT just once, name
"type" more helpfully.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 8cd49b9..c763de5 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -59,19 +59,25 @@
* the write call).
*/
static inline __be32
-nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
+nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int requested)
{
- if (type > 0 && (mode & S_IFMT) != type) {
- if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
- return nfserr_symlink;
- else if (type == S_IFDIR)
- return nfserr_notdir;
- else if ((mode & S_IFMT) == S_IFDIR)
- return nfserr_isdir;
- else
- return nfserr_inval;
- }
- return 0;
+ mode &= S_IFMT;
+
+ if (requested == 0) /* the caller doesn't care */
+ return nfs_ok;
+ if (mode == requested)
+ return nfs_ok;
+ /*
+ * v4 has an error more specific than err_notdir which we should
+ * return in preference to err_notdir:
+ */
+ if (rqstp->rq_vers == 4 && mode == S_IFLNK)
+ return nfserr_symlink;
+ if (requested == S_IFDIR)
+ return nfserr_notdir;
+ if (mode == S_IFDIR)
+ return nfserr_isdir;
+ return nfserr_inval;
}
static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
