X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmountd%2Fcache.c;h=f70f4d6e81a7e1ee7b57061f34b7d1c6d68ba162;hp=2ebdd45b2007be60923cb5343c73c40c8728ba42;hb=706bfd7c94d48659a1411fdef2a3a61d4719f1aa;hpb=0ae97c5b87a56870e74a74ae50aeb2ae0e496907

diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c
index 2ebdd45..f70f4d6 100644
--- a/utils/mountd/cache.c
+++ b/utils/mountd/cache.c
@@ -14,6 +14,7 @@
 #include <sys/types.h>
 #include <sys/select.h>
 #include <sys/stat.h>
+#include <sys/vfs.h>
 #include <time.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
@@ -36,6 +37,11 @@
 #include "blkid/blkid.h"
 #endif
 
+/*
+ * Invoked by RPC service loop
+ */
+void	cache_set_fds(fd_set *fdset);
+int	cache_process_req(fd_set *readfds);
 
 enum nfsd_fsid {
 	FSID_DEV = 0,
@@ -56,14 +62,14 @@ enum nfsd_fsid {
  * Record is terminated with newline.
  *
  */
-int cache_export_ent(char *domain, struct exportent *exp, char *p);
+static int cache_export_ent(char *domain, struct exportent *exp, char *p);
 
 
 char *lbuf  = NULL;
 int lbuflen = 0;
 extern int use_ipaddr;
 
-void auth_unix_ip(FILE *f)
+static void auth_unix_ip(FILE *f)
 {
 	/* requests are
 	 *  class IP-ADDR
@@ -74,10 +80,10 @@ void auth_unix_ip(FILE *f)
 	 */
 	char *cp;
 	char class[20];
-	char ipaddr[20];
+	char ipaddr[INET6_ADDRSTRLEN];
 	char *client = NULL;
-	struct in_addr addr;
-	struct hostent *he = NULL;
+	struct addrinfo *tmp = NULL;
+	struct addrinfo *ai = NULL;
 	if (readline(fileno(f), &lbuf, &lbuflen) != 1)
 		return;
 
@@ -89,20 +95,23 @@ void auth_unix_ip(FILE *f)
 	    strcmp(class, "nfsd") != 0)
 		return;
 
-	if (qword_get(&cp, ipaddr, 20) <= 0)
+	if (qword_get(&cp, ipaddr, sizeof(ipaddr)) <= 0)
 		return;
 
-	if (inet_aton(ipaddr, &addr)==0)
+	tmp = host_pton(ipaddr);
+	if (tmp == NULL)
 		return;
 
 	auth_reload();
 
 	/* addr is a valid, interesting address, find the domain name... */
 	if (!use_ipaddr) {
-		he = client_resolve(addr);
-		client = client_compose(he);
+		ai = client_resolve(tmp->ai_addr);
+		client = client_compose(ai);
+		freeaddrinfo(ai);
 	}
-	
+	freeaddrinfo(tmp);
+
 	qword_print(f, "nfsd");
 	qword_print(f, ipaddr);
 	qword_printint(f, time(0)+30*60);
@@ -113,18 +122,17 @@ void auth_unix_ip(FILE *f)
 	qword_eol(f);
 	xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT");
 
-	if (client) free(client);
-	free(he);
+	free(client);
 }
 
-void auth_unix_gid(FILE *f)
+static void auth_unix_gid(FILE *f)
 {
 	/* Request are
 	 *  uid
 	 * reply is
 	 *  uid expiry count list of group ids
 	 */
-	int uid;
+	uid_t uid;
 	struct passwd *pw;
 	gid_t glist[100], *groups = glist;
 	int ngroups = 100;
@@ -135,7 +143,7 @@ void auth_unix_gid(FILE *f)
 		return;
 
 	cp = lbuf;
-	if (qword_get_int(&cp, &uid) != 0)
+	if (qword_get_uint(&cp, &uid) != 0)
 		return;
 
 	pw = getpwuid(uid);
@@ -152,14 +160,14 @@ void auth_unix_gid(FILE *f)
 						  groups, &ngroups);
 		}
 	}
-	qword_printint(f, uid);
-	qword_printint(f, time(0)+30*60);
+	qword_printuint(f, uid);
+	qword_printuint(f, time(0)+30*60);
 	if (rv >= 0) {
-		qword_printint(f, ngroups);
+		qword_printuint(f, ngroups);
 		for (i=0; i<ngroups; i++)
-			qword_printint(f, groups[i]);
+			qword_printuint(f, groups[i]);
 	} else
-		qword_printint(f, 0);
+		qword_printuint(f, 0);
 	qword_eol(f);
 
 	if (groups != glist)
@@ -167,46 +175,57 @@ void auth_unix_gid(FILE *f)
 }
 
 #if USE_BLKID
-int get_uuid(char *path, char *uuid, int uuidlen, char *u)
+static const char *get_uuid_blkdev(char *path)
+{
+	/* We set *safe if we know that we need the
+	 * fsid from statfs too.
+	 */
+	static blkid_cache cache = NULL;
+	struct stat stb;
+	char *devname;
+	blkid_tag_iterate iter;
+	blkid_dev dev;
+	const char *type;
+	const char *val, *uuid = NULL;
+
+	if (cache == NULL)
+		blkid_get_cache(&cache, NULL);
+
+	if (stat(path, &stb) != 0)
+		return NULL;
+	devname = blkid_devno_to_devname(stb.st_dev);
+	if (!devname)
+		return NULL;
+	dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
+	free(devname);
+	if (!dev)
+		return NULL;
+	iter = blkid_tag_iterate_begin(dev);
+	if (!iter)
+		return NULL;
+	while (blkid_tag_next(iter, &type, &val) == 0) {
+		if (strcmp(type, "UUID") == 0)
+			uuid = val;
+		if (strcmp(type, "TYPE") == 0 &&
+		    strcmp(val, "btrfs") == 0) {
+			uuid = NULL;
+			break;
+		}
+	}
+	blkid_tag_iterate_end(iter);
+	return uuid;
+}
+#else
+#define get_uuid_blkdev(path) (NULL)
+#endif
+
+static int get_uuid(const char *val, int uuidlen, char *u)
 {
 	/* extract hex digits from uuidstr and compose a uuid
 	 * of the given length (max 16), xoring bytes to make
-	 * a smaller uuid.  Then compare with uuid
+	 * a smaller uuid.
 	 */
 	int i = 0;
-	const char *val;
-
-	if (path) {
-		static blkid_cache cache = NULL;
-		struct stat stb;
-		char *devname;
-		blkid_tag_iterate iter;
-		blkid_dev dev;
-		const char *type;
-		if (cache == NULL)
-			blkid_get_cache(&cache, NULL);
-
-		if (stat(path, &stb) != 0)
-			return 0;
-		devname = blkid_devno_to_devname(stb.st_dev);
-		if (!devname)
-			return 0;
-		dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
-		free(devname);
-		if (!dev)
-			return 0;
-		iter = blkid_tag_iterate_begin(dev);
-		if (!iter)
-			return 0;
-		while (blkid_tag_next(iter, &type, &val) == 0)
-			if (strcmp(type, "UUID") == 0)
-				break;
-		blkid_tag_iterate_end(iter);
-		if (!type)
-			return 0;
-	} else {
-		val = uuid;
-	}
 	
 	memset(u, 0, uuidlen);
 	for ( ; *val ; val++) {
@@ -229,7 +248,60 @@ int get_uuid(char *path, char *uuid, int uuidlen, char *u)
 	}
 	return 1;
 }
-#endif
+
+static int uuid_by_path(char *path, int type, int uuidlen, char *uuid)
+{
+	/* get a uuid for the filesystem found at 'path'.
+	 * There are several possible ways of generating the
+	 * uuids (types).
+	 * Type 0 is used for new filehandles, while other types
+	 * may be used to interpret old filehandle - to ensure smooth
+	 * forward migration.
+	 * We return 1 if a uuid was found (and it might be worth 
+	 * trying the next type) or 0 if no more uuid types can be
+	 * extracted.
+	 */
+
+	/* Possible sources of uuid are
+	 * - blkid uuid
+	 * - statfs64 uuid
+	 *
+	 * On some filesystems (e.g. vfat) the statfs64 uuid is simply an
+	 * encoding of the device that the filesystem is mounted from, so
+	 * it we be very bad to use that (as device numbers change).  blkid
+	 * must be preferred.
+	 * On other filesystems (e.g. btrfs) the statfs64 uuid contains
+	 * important info that the blkid uuid cannot contain:  This happens
+	 * when multiple subvolumes are exported (they have the same
+	 * blkid uuid but different statfs64 uuids).
+	 * We rely on get_uuid_blkdev *knowing* which is which and not returning
+	 * a uuid for filesystems where the statfs64 uuid is better.
+	 *
+	 */
+	struct statfs64 st;
+	char fsid_val[17];
+	const char *blkid_val;
+	const char *val;
+
+	blkid_val = get_uuid_blkdev(path);
+
+	if (statfs64(path, &st) == 0 &&
+	    (st.f_fsid.__val[0] || st.f_fsid.__val[1]))
+		snprintf(fsid_val, 17, "%08x%08x",
+			 st.f_fsid.__val[0], st.f_fsid.__val[1]);
+	else
+		fsid_val[0] = 0;
+
+	if (blkid_val && (type--) == 0)
+		val = blkid_val;
+	else if (fsid_val[0] && (type--) == 0)
+		val = fsid_val;
+	else
+		return 0;
+
+	get_uuid(val, uuidlen, uuid);
+	return 1;
+}
 
 /* Iterate through /etc/mtab, finding mountpoints
  * at or below a given path
@@ -256,7 +328,7 @@ static char *next_mnt(void **v, char *p)
 	return me->mnt_dir;
 }
 
-void nfsd_fh(FILE *f)
+static void nfsd_fh(FILE *f)
 {
 	/* request are:
 	 *  domain fsidtype fsid
@@ -273,8 +345,7 @@ void nfsd_fh(FILE *f)
 	unsigned int fsidnum=0;
 	char fsid[32];
 	struct exportent *found = NULL;
-	struct hostent *he = NULL;
-	struct in_addr addr;
+	struct addrinfo *ai = NULL;
 	char *found_path = NULL;
 	nfs_export *exp;
 	int i;
@@ -373,10 +444,11 @@ void nfsd_fh(FILE *f)
 	/* Now determine export point for this fsid/domain */
 	for (i=0 ; i < MCL_MAXTYPES; i++) {
 		nfs_export *next_exp;
-		for (exp = exportlist[i]; exp; exp = next_exp) {
+		for (exp = exportlist[i].p_head; exp; exp = next_exp) {
 			struct stat stb;
 			char u[16];
 			char *path;
+			int type;
 
 			if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
 				static nfs_export *prev = NULL;
@@ -439,28 +511,30 @@ void nfsd_fh(FILE *f)
 				if (!is_mountpoint(path))
 					continue;
 			check_uuid:
-#if USE_BLKID
 				if (exp->m_export.e_uuid)
-					get_uuid(NULL, exp->m_export.e_uuid,
+					get_uuid(exp->m_export.e_uuid,
 						 uuidlen, u);
-				else if (get_uuid(path, NULL,
-						  uuidlen, u) == 0)
-					continue;
+				else
+					for (type = 0;
+					     uuid_by_path(path, type, uuidlen, u);
+					     type++)
+						if (memcmp(u, fhuuid, uuidlen) == 0)
+							break;
 
 				if (memcmp(u, fhuuid, uuidlen) != 0)
 					continue;
 				break;
-#else
-				continue;
-#endif
 			}
 			if (use_ipaddr) {
-				if (he == NULL) {
-					if (!inet_aton(dom, &addr))
+				if (ai == NULL) {
+					struct addrinfo *tmp;
+					tmp = host_pton(dom);
+					if (tmp == NULL)
 						goto out;
-					he = client_resolve(addr);
+					ai = client_resolve(tmp->ai_addr);
+					freeaddrinfo(tmp);
 				}
-				if (!client_check(exp->m_client, he))
+				if (!client_check(exp->m_client, ai))
 					continue;
 			}
 			/* It's a match !! */
@@ -518,21 +592,20 @@ void nfsd_fh(FILE *f)
  out:
 	if (found_path)
 		free(found_path);
-	if (he)
-		free(he);
+	freeaddrinfo(ai);
 	free(dom);
 	xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL);
 	return;		
 }
 
-static void write_fsloc(FILE *f, struct exportent *ep, char *path)
+static void write_fsloc(FILE *f, struct exportent *ep)
 {
 	struct servers *servers;
 
 	if (ep->e_fslocmethod == FSLOC_NONE)
 		return;
 
-	servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata, path);
+	servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata);
 	if (!servers)
 		return;
 	qword_print(f, "fsloc");
@@ -548,7 +621,7 @@ static void write_fsloc(FILE *f, struct exportent *ep, char *path)
 	release_replicas(servers);
 }
 
-static void write_secinfo(FILE *f, struct exportent *ep)
+static void write_secinfo(FILE *f, struct exportent *ep, int flag_mask)
 {
 	struct sec_entry *p;
 
@@ -562,7 +635,7 @@ static void write_secinfo(FILE *f, struct exportent *ep)
 	qword_printint(f, p - ep->e_secinfo);
 	for (p = ep->e_secinfo; p->flav; p++) {
 		qword_printint(f, p->flav->fnum);
-		qword_printint(f, p->flags);
+		qword_printint(f, p->flags & flag_mask);
 	}
 
 }
@@ -574,101 +647,81 @@ static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *ex
 	qword_printint(f, time(0)+30*60);
 	if (exp) {
 		int different_fs = strcmp(path, exp->e_path) != 0;
-		
-		if (different_fs)
-			qword_printint(f, exp->e_flags & ~NFSEXP_FSID);
-		else
-			qword_printint(f, exp->e_flags);
+		int flag_mask = different_fs ? ~NFSEXP_FSID : ~0;
+
+		qword_printint(f, exp->e_flags & flag_mask);
 		qword_printint(f, exp->e_anonuid);
 		qword_printint(f, exp->e_anongid);
 		qword_printint(f, exp->e_fsid);
-		write_fsloc(f, exp, path);
-		write_secinfo(f, exp);
-#if USE_BLKID
+		write_fsloc(f, exp);
+		write_secinfo(f, exp, flag_mask);
  		if (exp->e_uuid == NULL || different_fs) {
  			char u[16];
- 			if (get_uuid(path, NULL, 16, u)) {
+ 			if (uuid_by_path(path, 0, 16, u)) {
  				qword_print(f, "uuid");
  				qword_printhex(f, u, 16);
  			}
  		} else {
  			char u[16];
- 			get_uuid(NULL, exp->e_uuid, 16, u);
+ 			get_uuid(exp->e_uuid, 16, u);
  			qword_print(f, "uuid");
  			qword_printhex(f, u, 16);
  		}
-#endif
 	}
 	return qword_eol(f);
 }
 
-void nfsd_export(FILE *f)
+static int is_subdirectory(char *child, char *parent)
 {
-	/* requests are:
-	 *  domain path
-	 * determine export options and return:
-	 *  domain path expiry flags anonuid anongid fsid
-	 */
-
-	char *cp;
-	int i;
-	char *dom, *path;
-	nfs_export *exp, *found = NULL;
-	int found_type = 0;
-	struct in_addr addr;
-	struct hostent *he = NULL;
-
+	int l = strlen(parent);
 
-	if (readline(fileno(f), &lbuf, &lbuflen) != 1)
-		return;
-
-	xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf);
+	return strcmp(child, parent) == 0
+		|| (strncmp(child, parent, l) == 0 && child[l] == '/');
+}
 
-	cp = lbuf;
-	dom = malloc(strlen(cp));
-	path = malloc(strlen(cp));
+static int path_matches(nfs_export *exp, char *path)
+{
+	if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
+		return is_subdirectory(path, exp->m_export.e_path);
+	return strcmp(path, exp->m_export.e_path) == 0;
+}
 
-	if (!dom || !path)
-		goto out;
+static int
+client_matches(nfs_export *exp, char *dom, struct addrinfo *ai)
+{
+	if (use_ipaddr)
+		return client_check(exp->m_client, ai);
+	return client_member(dom, exp->m_client->m_hostname);
+}
 
-	if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
-		goto out;
-	if (qword_get(&cp, path, strlen(lbuf)) <= 0)
-		goto out;
+static int
+export_matches(nfs_export *exp, char *dom, char *path, struct addrinfo *ai)
+{
+	return path_matches(exp, path) && client_matches(exp, dom, ai);
+}
 
-	auth_reload();
+static nfs_export *
+lookup_export(char *dom, char *path, struct addrinfo *ai)
+{
+	nfs_export *exp;
+	nfs_export *found = NULL;
+	int found_type = 0;
+	int i;
 
-	/* now find flags for this export point in this domain */
 	for (i=0 ; i < MCL_MAXTYPES; i++) {
-		for (exp = exportlist[i]; exp; exp = exp->m_next) {
-			if (!use_ipaddr && !client_member(dom, exp->m_client->m_hostname))
-				continue;
-			if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
-				/* if path is a mountpoint below e_path, then OK */
-				int l = strlen(exp->m_export.e_path);
-				if (strcmp(path, exp->m_export.e_path) == 0 ||
-				    (strncmp(path, exp->m_export.e_path, l) == 0 &&
-				     path[l] == '/' &&
-				     is_mountpoint(path)))
-					/* ok */;
-				else
-					continue;
-			} else if (strcmp(path, exp->m_export.e_path) != 0)
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			if (!export_matches(exp, dom, path, ai))
 				continue;
-			if (use_ipaddr) {
-				if (he == NULL) {
-					if (!inet_aton(dom, &addr))
-						goto out;
-					he = client_resolve(addr);
-				}
-				if (!client_check(exp->m_client, he))
-					continue;
-			}
 			if (!found) {
 				found = exp;
 				found_type = i;
 				continue;
 			}
+
+			/* Always prefer non-V4ROOT mounts */
+			if (found->m_export.e_flags & NFSEXP_V4ROOT)
+				continue;
+
 			/* If one is a CROSSMOUNT, then prefer the longest path */
 			if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
 			     (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
@@ -691,6 +744,52 @@ void nfsd_export(FILE *f)
 			}
 		}
 	}
+	return found;
+}
+
+static void nfsd_export(FILE *f)
+{
+	/* requests are:
+	 *  domain path
+	 * determine export options and return:
+	 *  domain path expiry flags anonuid anongid fsid
+	 */
+
+	char *cp;
+	char *dom, *path;
+	nfs_export *found = NULL;
+	struct addrinfo *ai = NULL;
+
+	if (readline(fileno(f), &lbuf, &lbuflen) != 1)
+		return;
+
+	xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf);
+
+	cp = lbuf;
+	dom = malloc(strlen(cp));
+	path = malloc(strlen(cp));
+
+	if (!dom || !path)
+		goto out;
+
+	if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
+		goto out;
+	if (qword_get(&cp, path, strlen(lbuf)) <= 0)
+		goto out;
+
+	auth_reload();
+
+	if (use_ipaddr) {
+		struct addrinfo *tmp;
+		tmp = host_pton(dom);
+		if (tmp == NULL)
+			goto out;
+		ai = client_resolve(tmp->ai_addr);
+		freeaddrinfo(tmp);
+			goto out;
+	}
+
+	found = lookup_export(dom, path, ai);
 
 	if (found) {
 		if (dump_to_cache(f, dom, path, &found->m_export) < 0) {
@@ -706,7 +805,7 @@ void nfsd_export(FILE *f)
 	xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
 	if (dom) free(dom);
 	if (path) free(path);
-	if (he) free(he);
+	freeaddrinfo(ai);
 }
 
 
@@ -715,14 +814,19 @@ struct {
 	void (*cache_handle)(FILE *f);
 	FILE *f;
 } cachelist[] = {
-	{ "auth.unix.ip", auth_unix_ip},
-	{ "auth.unix.gid", auth_unix_gid},
-	{ "nfsd.export", nfsd_export},
-	{ "nfsd.fh", nfsd_fh},
-	{ NULL, NULL }
+	{ "auth.unix.ip", auth_unix_ip, NULL},
+	{ "auth.unix.gid", auth_unix_gid, NULL},
+	{ "nfsd.export", nfsd_export, NULL},
+	{ "nfsd.fh", nfsd_fh, NULL},
+	{ NULL, NULL, NULL }
 };
 
 extern int manage_gids;
+
+/**
+ * cache_open - prepare communications channels with kernel RPC caches
+ *
+ */
 void cache_open(void) 
 {
 	int i;
@@ -735,6 +839,10 @@ void cache_open(void)
 	}
 }
 
+/**
+ * cache_set_fds - prepare cache file descriptors for one iteration of the service loop
+ * @fdset: pointer to fd_set to prepare
+ */
 void cache_set_fds(fd_set *fdset)
 {
 	int i;
@@ -744,6 +852,10 @@ void cache_set_fds(fd_set *fdset)
 	}
 }
 
+/**
+ * cache_process_req - process any active cache file descriptors during service loop iteration
+ * @fdset: pointer to fd_set to examine for activity
+ */
 int cache_process_req(fd_set *readfds) 
 {
 	int i;
@@ -766,7 +878,7 @@ int cache_process_req(fd_set *readfds)
  * % echo $domain $path $[now+30*60] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
  */
 
-int cache_export_ent(char *domain, struct exportent *exp, char *path)
+static int cache_export_ent(char *domain, struct exportent *exp, char *path)
 {
 	int err;
 	FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
@@ -787,8 +899,8 @@ int cache_export_ent(char *domain, struct exportent *exp, char *path)
 		 * and export them with the same options
 		 */
 		struct stat stb;
-		int l = strlen(exp->e_path);
-		int dev;
+		size_t l = strlen(exp->e_path);
+		__dev_t dev;
 
 		if (strlen(path) <= l || path[l] != '/' ||
 		    strncmp(exp->e_path, path, l) != 0)
@@ -824,8 +936,14 @@ int cache_export_ent(char *domain, struct exportent *exp, char *path)
 	return err;
 }
 
+/**
+ * cache_export - Inform kernel of a new nfs_export
+ * @exp: target nfs_export
+ * @path: NUL-terminated C string containing export path
+ */
 int cache_export(nfs_export *exp, char *path)
 {
+	char buf[INET6_ADDRSTRLEN];
 	int err;
 	FILE *f;
 
@@ -833,8 +951,10 @@ int cache_export(nfs_export *exp, char *path)
 	if (!f)
 		return -1;
 
+
 	qword_print(f, "nfsd");
-	qword_print(f, inet_ntoa(exp->m_client->m_addrlist[0]));
+	qword_print(f,
+		host_ntop(get_addrlist(exp->m_client, 0), buf, sizeof(buf)));
 	qword_printint(f, time(0)+30*60);
 	qword_print(f, exp->m_client->m_hostname);
 	err = qword_eol(f);
@@ -846,7 +966,14 @@ int cache_export(nfs_export *exp, char *path)
 	return err;
 }
 
-/* Get a filehandle.
+/**
+ * cache_get_filehandle - given an nfs_export, get its root filehandle
+ * @exp: target nfs_export
+ * @len: length of requested file handle
+ * @p: NUL-terminated C string containing export path
+ *
+ * Returns pointer to NFS file handle of root directory of export
+ *
  * { 
  *   echo $domain $path $length 
  *   read filehandle <&0
@@ -880,4 +1007,3 @@ cache_get_filehandle(nfs_export *exp, int len, char *p)
 	fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);
 	return &fh;
 }
-