[PATCH nfs-utils] Remove redundant m_path field

["J. Bruce Fields" <bfields@fieldses.org>]

From: J. Bruce Fields <bfields@citi.umich.edu>

Contrary to the comment above its definition, the field m_path always
has the same value as e_path: the *only* modifications of m_path are all
of the form:

	strncpy(exp->m_export.m_path, exp->m_export.e_path,
		sizeof (exp->m_export.m_path) - 1);
	exp->m_export.m_path[sizeof (exp->m_export.m_path) - 1] = '\0';

So m_path is always just a copy of e_path.  In places where we need to
store a path to a submount of a CROSSMNT-exported filesystem, as in
cache.c, we just use a local variable.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
---
 support/export/export.c  |   12 ------------
 support/export/nfsctl.c  |    4 ++--
 support/include/nfslib.h |    5 -----
 support/nfs/exports.c    |    6 ------
 utils/mountd/mountd.c    |   12 ++----------
 utils/mountd/rmtab.c     |    4 +---
 6 files changed, 5 insertions(+), 38 deletions(-)

Looks obviously correct, but I haven't tested it!

diff --git a/support/export/export.c b/support/export/export.c
index 93c58b6..14af112 100644
--- a/support/export/export.c
+++ b/support/export/export.c
@@ -255,15 +255,3 @@ export_freeall(void)
 	}
 	client_freeall();
 }
-
-void
-export_reset(nfs_export *exp)
-{
-	if (!exp)
-		return;
-
-	/* Restore m_path. */
-	strncpy(exp->m_export.m_path, exp->m_export.e_path,
-		sizeof (exp->m_export.m_path) - 1);
-	exp->m_export.m_path[sizeof (exp->m_export.m_path) - 1] = '\0';
-}
diff --git a/support/export/nfsctl.c b/support/export/nfsctl.c
index 32d92bd..e2877b9 100644
--- a/support/export/nfsctl.c
+++ b/support/export/nfsctl.c
@@ -89,11 +89,11 @@ expsetup(struct nfsctl_export *exparg, nfs_export *exp, int unexport)
 	nfs_client		*clp = exp->m_client;
 	struct stat		stb;
 
-	if (stat(exp->m_export.m_path, &stb) < 0)
+	if (stat(exp->m_export.e_path, &stb) < 0)
 		return 0;
 
 	memset(exparg, 0, sizeof(*exparg));
-	strncpy(exparg->ex_path, exp->m_export.m_path,
+	strncpy(exparg->ex_path, exp->m_export.e_path,
 		sizeof (exparg->ex_path) - 1);
 	strncpy(exparg->ex_client, clp->m_hostname,
 		sizeof (exparg->ex_client) - 1);
diff --git a/support/include/nfslib.h b/support/include/nfslib.h
index 422b012..a51d79d 100644
--- a/support/include/nfslib.h
+++ b/support/include/nfslib.h
@@ -67,11 +67,6 @@ struct sec_entry {
 struct exportent {
 	char *		e_hostname;
 	char		e_path[NFS_MAXPATHLEN+1];
-	/* The mount path may be different from the exported path due
-	   to submount. It may change for every mount. The idea is we
-	   set m_path every time when we process a mount. We should not
-	   use it for anything else. */
-	char		m_path[NFS_MAXPATHLEN+1];
 	int		e_flags;
 	int		e_anonuid;
 	int		e_anongid;
diff --git a/support/nfs/exports.c b/support/nfs/exports.c
index 525e5b1..04e3698 100644
--- a/support/nfs/exports.c
+++ b/support/nfs/exports.c
@@ -127,8 +127,6 @@ getexportent(int fromkernel, int fromexports)
 		if (ok <= 0)
 			return NULL;
 
-		strncpy (def_ee.m_path, def_ee.e_path, sizeof (def_ee.m_path) - 1);
-		def_ee.m_path [sizeof (def_ee.m_path) - 1] = '\0';
 		ok = getexport(exp, sizeof(exp));
 	}
 	if (ok < 0) {
@@ -187,8 +185,6 @@ getexportent(int fromkernel, int fromexports)
 		rpath[sizeof (rpath) - 1] = '\0';
 		strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
 		ee.e_path[sizeof (ee.e_path) - 1] = '\0';
-		strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
-		ee.m_path [sizeof (ee.m_path) - 1] = '\0';
 	}
 
 	return &ee;
@@ -360,8 +356,6 @@ mkexportent(char *hname, char *path, char *options)
 	}
 	strncpy(ee.e_path, path, sizeof (ee.e_path));
 	ee.e_path[sizeof (ee.e_path) - 1] = '\0';
-	strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
-	ee.m_path [sizeof (ee.m_path) - 1] = '\0';
 	if (parseopts(options, &ee, 0, NULL) < 0)
 		return NULL;
 	return &ee;
diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c
index 8137f7f..0facf89 100644
--- a/utils/mountd/mountd.c
+++ b/utils/mountd/mountd.c
@@ -230,9 +230,6 @@ mount_umnt_1_svc(struct svc_req *rqstp, dirpath *argp, void *resp)
 		return 1;
 	}
 
-	if (!new_cache)
-		export_reset (exp);
-
 	mountlist_del(inet_ntoa(sin->sin_addr), p);
 	return 1;
 }
@@ -312,7 +309,6 @@ mount_pathconf_2_svc(struct svc_req *rqstp, dirpath *path, ppathcnf *res)
 	} else if (stat(p, &stb) < 0) {
 		xlog(L_WARNING, "can't stat exported dir %s: %s",
 				p, strerror(errno));
-		export_reset (exp);
 		return 1;
 	}
 
@@ -328,8 +324,6 @@ mount_pathconf_2_svc(struct svc_req *rqstp, dirpath *path, ppathcnf *res)
 	res->pc_mask[0]   = 0;
 	res->pc_mask[1]   = 0;
 
-	export_reset (exp);
-
 	return 1;
 }
 
@@ -457,13 +451,11 @@ get_rootfh(struct svc_req *rqstp, dirpath *path, mountstat3 *error, int v3)
 		if (fh != NULL) {
 			mountlist_add(inet_ntoa(sin->sin_addr), p);
 			*error = NFS_OK;
-			export_reset (exp);
 			return fh;
 		}
 		xlog(L_WARNING, "getfh failed: %s", strerror(errno));
 		*error = NFSERR_ACCES;
 	}
-	export_reset (exp);
 	return NULL;
 }
 
@@ -499,14 +491,14 @@ get_exportlist(void)
 	for (i = 0; i < MCL_MAXTYPES; i++) {
 		for (exp = exportlist[i]; exp; exp = exp->m_next) {
 			for (e = elist; e != NULL; e = e->ex_next) {
-				if (!strcmp(exp->m_export.m_path, e->ex_dir))
+				if (!strcmp(exp->m_export.e_path, e->ex_dir))
 					break;
 			}
 			if (!e) {
 				e = (struct exportnode *) xmalloc(sizeof(*e));
 				e->ex_next = elist;
 				e->ex_groups = NULL;
-				e->ex_dir = xstrdup(exp->m_export.m_path);
+				e->ex_dir = xstrdup(exp->m_export.e_path);
 				elist = e;
 			}
 
diff --git a/utils/mountd/rmtab.c b/utils/mountd/rmtab.c
index e8aff5a..5787ed6 100644
--- a/utils/mountd/rmtab.c
+++ b/utils/mountd/rmtab.c
@@ -162,10 +162,8 @@ mountlist_del_all(struct sockaddr_in *sin)
 	}
 	while ((rep = getrmtabent(1, NULL)) != NULL) {
 		if (strcmp(rep->r_client, hp->h_name) == 0 &&
-		    (exp = auth_authenticate("umountall", sin, rep->r_path))) {
-			export_reset(exp);
+		    (exp = auth_authenticate("umountall", sin, rep->r_path)))
 			continue;
-		}
 		fputrmtabent(fp, rep, NULL);
 	}
 	if (slink_safe_rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
-- 
1.5.5.rc1