From: Mark Fasheh <mark.fasheh@oracle.com>
Date: Fri, 8 Sep 2006 18:38:29 +0000 (-0700)
Subject: ocfs2: Allow binary names in the DLM
X-Git-Tag: v2.6.19-rc1~1259^2~26
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3384f3df5ed939a25135e1b2734fb7cdee1720a8;p=linux-2.6

ocfs2: Allow binary names in the DLM

The OCFS2 DLM uses strlen() to determine lock name length, which excludes
the possibility of putting binary values in the name string. Fix this by
requiring that string length be passed in as a parameter.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
---

diff --git a/fs/ocfs2/dlm/dlmapi.h b/fs/ocfs2/dlm/dlmapi.h
index 53652f51c0..cfd5cb65ca 100644
--- a/fs/ocfs2/dlm/dlmapi.h
+++ b/fs/ocfs2/dlm/dlmapi.h
@@ -182,6 +182,7 @@ enum dlm_status dlmlock(struct dlm_ctxt *dlm,
 			struct dlm_lockstatus *lksb,
 			int flags,
 			const char *name,
+			int namelen,
 			dlm_astlockfunc_t *ast,
 			void *data,
 			dlm_bastlockfunc_t *bast);
diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index 14530ee7e1..fa968180b0 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -747,6 +747,7 @@ void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
 			      u8 owner);
 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
 						 const char *lockid,
+						 int namelen,
 						 int flags);
 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
 					  const char *name,
diff --git a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c
index 5ca57ec650..42a1b91979 100644
--- a/fs/ocfs2/dlm/dlmlock.c
+++ b/fs/ocfs2/dlm/dlmlock.c
@@ -540,8 +540,8 @@ static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie)
 
 enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
 			struct dlm_lockstatus *lksb, int flags,
-			const char *name, dlm_astlockfunc_t *ast, void *data,
-			dlm_bastlockfunc_t *bast)
+			const char *name, int namelen, dlm_astlockfunc_t *ast,
+			void *data, dlm_bastlockfunc_t *bast)
 {
 	enum dlm_status status;
 	struct dlm_lock_resource *res = NULL;
@@ -571,7 +571,7 @@ enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
 	recovery = (flags & LKM_RECOVERY);
 
 	if (recovery &&
-	    (!dlm_is_recovery_lock(name, strlen(name)) || convert) ) {
+	    (!dlm_is_recovery_lock(name, namelen) || convert) ) {
 		dlm_error(status);
 		goto error;
 	}
@@ -643,7 +643,7 @@ retry_convert:
 		}
 
 		status = DLM_IVBUFLEN;
-		if (strlen(name) > DLM_LOCKID_NAME_MAX || strlen(name) < 1) {
+		if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) {
 			dlm_error(status);
 			goto error;
 		}
@@ -659,7 +659,7 @@ retry_convert:
 			dlm_wait_for_recovery(dlm);
 
 		/* find or create the lock resource */
-		res = dlm_get_lock_resource(dlm, name, flags);
+		res = dlm_get_lock_resource(dlm, name, namelen, flags);
 		if (!res) {
 			status = DLM_IVLOCKID;
 			dlm_error(status);
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 9503240ef0..f784177b62 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -740,6 +740,7 @@ struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
  */
 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
 					  const char *lockid,
+					  int namelen,
 					  int flags)
 {
 	struct dlm_lock_resource *tmpres=NULL, *res=NULL;
@@ -748,13 +749,12 @@ struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
 	int blocked = 0;
 	int ret, nodenum;
 	struct dlm_node_iter iter;
-	unsigned int namelen, hash;
+	unsigned int hash;
 	int tries = 0;
 	int bit, wait_on_recovery = 0;
 
 	BUG_ON(!lockid);
 
-	namelen = strlen(lockid);
 	hash = dlm_lockid_hash(lockid, namelen);
 
 	mlog(0, "get lockres %s (len %d)\n", lockid, namelen);
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 594745fab0..9d950d7cea 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -2285,7 +2285,8 @@ again:
 	memset(&lksb, 0, sizeof(lksb));
 
 	ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY,
-		      DLM_RECOVERY_LOCK_NAME, dlm_reco_ast, dlm, dlm_reco_bast);
+		      DLM_RECOVERY_LOCK_NAME, DLM_RECOVERY_LOCK_NAME_LEN,
+		      dlm_reco_ast, dlm, dlm_reco_bast);
 
 	mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n",
 	     dlm->name, ret, lksb.status);