Commits:
2f669b6f NFS server should enable RDMA by default
d77ece22 mountd/exportd: only log confirmed clients, and poll for updates
ac266e2e exportfs: fix unexporting of '/'

diff --git a/nfs.conf b/nfs.conf
index 9042d27d..31994f61 100644
--- a/nfs.conf
+++ b/nfs.conf
@@ -72,9 +72,9 @@
 # vers4.0=y
 # vers4.1=y
 # vers4.2=y
-# rdma=n
-# rdma-port=20049
-#
+rdma=y
+rdma-port=20049
+
 [statd]
 # debug=0
 # port=0
diff --git a/support/export/v4clients.c b/support/export/v4clients.c
index 056ddc9b..dd985463 100644
--- a/support/export/v4clients.c
+++ b/support/export/v4clients.c
@@ -48,12 +48,15 @@ void v4clients_set_fds(fd_set *fdset)
 }
 
 static void *tree_root;
+static int have_unconfirmed;
 
 struct ent {
 	unsigned long num;
 	char *clientid;
 	char *addr;
 	int vers;
+	int unconfirmed;
+	int wid;
 };
 
 static int ent_cmp(const void *av, const void *bv)
@@ -89,15 +92,14 @@ static char *dup_line(char *line)
 	return ret;
 }
 
-static void add_id(int id)
+static void read_info(struct ent *key)
 {
 	char buf[2048];
-	struct ent **ent;
-	struct ent *key;
 	char *path;
+	int was_unconfirmed = key->unconfirmed;
 	FILE *f;
 
-	if (asprintf(&path, "/proc/fs/nfsd/clients/%d/info", id) < 0)
+	if (asprintf(&path, "/proc/fs/nfsd/clients/%lu/info", key->num) < 0)
 		return;
 
 	f = fopen(path, "r");
@@ -105,35 +107,64 @@ static void add_id(int id)
 		free(path);
 		return;
 	}
-	key = calloc(1, sizeof(*key));
-	if (!key) {
-		fclose(f);
-		free(path);
-		return;
-	}
-	key->num = id;
+	if (key->wid < 0)
+		key->wid = inotify_add_watch(clients_fd, path, IN_MODIFY);
+
 	while (fgets(buf, sizeof(buf), f)) {
-		if (strncmp(buf, "clientid: ", 10) == 0)
+		if (strncmp(buf, "clientid: ", 10) == 0) {
+			free(key->clientid);
 			key->clientid = dup_line(buf+10);
-		if (strncmp(buf, "address: ", 9) == 0)
+		}
+		if (strncmp(buf, "address: ", 9) == 0) {
+			free(key->addr);
 			key->addr = dup_line(buf+9);
+		}
 		if (strncmp(buf, "minor version: ", 15) == 0)
 			key->vers = atoi(buf+15);
+		if (strncmp(buf, "status: ", 8) == 0 &&
+		    strstr(buf, " unconfirmed") != NULL) {
+			key->unconfirmed = 1;
+			have_unconfirmed = 1;
+		}
+		if (strncmp(buf, "status: ", 8) == 0 &&
+		    strstr(buf, " confirmed") != NULL)
+			key->unconfirmed = 0;
 	}
 	fclose(f);
 	free(path);
 
-	xlog(L_NOTICE, "v4.%d client attached: %s from %s",
-	     key->vers, key->clientid, key->addr);
+	if (was_unconfirmed && !key->unconfirmed)
+		xlog(L_NOTICE, "v4.%d client attached: %s from %s",
+		     key->vers, key->clientid ?: "-none-",
+		     key->addr ?: "-none-");
+	if (!key->unconfirmed && key->wid >= 0) {
+		inotify_rm_watch(clients_fd, key->wid);
+		key->wid = -1;
+	}
+}
+
+static void add_id(int id)
+{
+	struct ent **ent;
+	struct ent *key;
+
+	key = calloc(1, sizeof(*key));
+	if (!key) {
+		return;
+	}
+	key->num = id;
+	key->wid = -1;
 
 	ent = tsearch(key, &tree_root, ent_cmp);
 
 	if (!ent || *ent != key)
 		/* Already existed, or insertion failed */
 		free_ent(key);
+	else
+		read_info(key);
 }
 
-static void del_id(int id)
+static void del_id(unsigned long id)
 {
 	struct ent key = {.num = id};
 	struct ent **e, *ent;
@@ -143,11 +174,27 @@ static void del_id(int id)
 		return;
 	ent = *e;
 	tdelete(ent, &tree_root, ent_cmp);
-	xlog(L_NOTICE, "v4.%d client detached: %s from %s",
-	     ent->vers, ent->clientid, ent->addr);
+	if (!ent->unconfirmed)
+		xlog(L_NOTICE, "v4.%d client detached: %s from %s",
+		     ent->vers, ent->clientid, ent->addr);
+	if (ent->wid >= 0)
+		inotify_rm_watch(clients_fd, ent->wid);
 	free_ent(ent);
 }
 
+static void check_id(unsigned long id)
+{
+	struct ent key = {.num = id};
+	struct ent **e, *ent;
+
+	e = tfind(&key, &tree_root, ent_cmp);
+	if (!e || !*e)
+		return;
+	ent = *e;
+	if (ent->unconfirmed)
+		read_info(ent);
+}
+
 int v4clients_process(fd_set *fdset)
 {
 	char buf[4096] __attribute__((aligned(__alignof__(struct inotify_event))));
@@ -172,8 +219,9 @@ int v4clients_process(fd_set *fdset)
 				add_id(id);
 			if (ev->mask & IN_DELETE)
 				del_id(id);
+			if (ev->mask & IN_MODIFY)
+				check_id(id);
 		}
 	}
 	return 1;
 }
-
diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index 262dd19a..25d757d8 100644
--- a/utils/exportfs/exportfs.c
+++ b/utils/exportfs/exportfs.c
@@ -383,7 +383,7 @@ unexportfs_parsed(char *hname, char *path, int verbose)
 	 * so need to deal with it.
 	*/
 	size_t nlen = strlen(path);
-	while (path[nlen - 1] == '/')
+	while ((nlen > 1) && (path[nlen - 1] == '/'))
 		nlen--;
 
 	for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {