svn commit: r291638 - head/sys/fs/nfs

[Rick Macklem]

Author: rmacklem
Date: Wed Dec  2 02:47:13 2015
New Revision: 291638
URL: https://svnweb.freebsd.org/changeset/base/291638

Log:
  Fix the memory leak that occurs when the nfscommon.ko module is unloaded.
  This leak was introduced by r291527.
  Since the nfscommon.ko module is rarely unloaded, this leak would not
  have been much of an issue.
  
  MFC after:	2 weeks

Modified:
  head/sys/fs/nfs/nfs_commonport.c
  head/sys/fs/nfs/nfs_commonsubs.c
  head/sys/fs/nfs/nfs_var.h

Modified: head/sys/fs/nfs/nfs_commonport.c
==============================================================================
--- head/sys/fs/nfs/nfs_commonport.c	Wed Dec  2 02:11:38 2015	(r291637)
+++ head/sys/fs/nfs/nfs_commonport.c	Wed Dec  2 02:47:13 2015	(r291638)
@@ -623,6 +623,8 @@ nfscommon_modevent(module_t mod, int typ
 
 		nfsd_call_nfscommon = NULL;
 		callout_drain(&newnfsd_callout);
+		/* Clean out the name<-->id cache. */
+		nfsrv_cleanusergroup();
 		/* and get rid of the mutexes */
 		mtx_destroy(&nfs_nameid_mutex);
 		mtx_destroy(&newnfsd_mtx);

Modified: head/sys/fs/nfs/nfs_commonsubs.c
==============================================================================
--- head/sys/fs/nfs/nfs_commonsubs.c	Wed Dec  2 02:11:38 2015	(r291637)
+++ head/sys/fs/nfs/nfs_commonsubs.c	Wed Dec  2 02:47:13 2015	(r291638)
@@ -3546,6 +3546,55 @@ nfsrv_removeuser(struct nfsusrgrp *usrp,
 }
 
 /*
+ * Free up all the allocations related to the name<-->id cache.
+ * This function should only be called when the nfsuserd daemon isn't
+ * running, since it doesn't do any locking.
+ * This function is meant to be used when the nfscommon module is unloaded.
+ */
+APPLESTATIC void
+nfsrv_cleanusergroup(void)
+{
+	struct nfsrv_lughash *hp, *hp2;
+	struct nfsusrgrp *nusrp, *usrp;
+	int i;
+
+	if (nfsuserhash == NULL)
+		return;
+
+	for (i = 0; i < nfsrv_lughashsize; i++) {
+		hp = &nfsuserhash[i];
+		TAILQ_FOREACH_SAFE(usrp, &hp->lughead, lug_numhash, nusrp) {
+			TAILQ_REMOVE(&hp->lughead, usrp, lug_numhash);
+			hp2 = NFSUSERNAMEHASH(usrp->lug_name,
+			    usrp->lug_namelen);
+			TAILQ_REMOVE(&hp2->lughead, usrp, lug_namehash);
+			if (usrp->lug_cred != NULL)
+				crfree(usrp->lug_cred);
+			free(usrp, M_NFSUSERGROUP);
+		}
+		hp = &nfsgrouphash[i];
+		TAILQ_FOREACH_SAFE(usrp, &hp->lughead, lug_numhash, nusrp) {
+			TAILQ_REMOVE(&hp->lughead, usrp, lug_numhash);
+			hp2 = NFSGROUPNAMEHASH(usrp->lug_name,
+			    usrp->lug_namelen);
+			TAILQ_REMOVE(&hp2->lughead, usrp, lug_namehash);
+			if (usrp->lug_cred != NULL)
+				crfree(usrp->lug_cred);
+			free(usrp, M_NFSUSERGROUP);
+		}
+		mtx_destroy(&nfsuserhash[i].mtx);
+		mtx_destroy(&nfsusernamehash[i].mtx);
+		mtx_destroy(&nfsgroupnamehash[i].mtx);
+		mtx_destroy(&nfsgrouphash[i].mtx);
+	}
+	free(nfsuserhash, M_NFSUSERGROUP);
+	free(nfsusernamehash, M_NFSUSERGROUP);
+	free(nfsgrouphash, M_NFSUSERGROUP);
+	free(nfsgroupnamehash, M_NFSUSERGROUP);
+	free(nfsrv_dnsname, M_NFSSTRING);
+}
+
+/*
  * This function scans a byte string and checks for UTF-8 compliance.
  * It returns 0 if it conforms and NFSERR_INVAL if not.
  */

Modified: head/sys/fs/nfs/nfs_var.h
==============================================================================
--- head/sys/fs/nfs/nfs_var.h	Wed Dec  2 02:11:38 2015	(r291637)
+++ head/sys/fs/nfs/nfs_var.h	Wed Dec  2 02:47:13 2015	(r291638)
@@ -283,6 +283,7 @@ void nfsv4_getref(struct nfsv4lock *, in
 int nfsv4_getref_nonblock(struct nfsv4lock *);
 int nfsv4_testlock(struct nfsv4lock *);
 int nfsrv_mtostr(struct nfsrv_descript *, char *, int);
+void nfsrv_cleanusergroup(void);
 int nfsrv_checkutf8(u_int8_t *, int);
 int newnfs_sndlock(int *);
 void newnfs_sndunlock(int *);