From 4217c939ec6bdb80a3fe953e5b60f6f7b7a43635 Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra@samba.org>
Date: Tue, 18 Apr 2000 20:41:04 +0000
Subject: locking/locking.c: Fixed placeholder code for POSIX locking.
 printing/printing.c: Cast tdb_delete to (tdb_traverse_func) to stop warning. 
                     tmpfile gives mirror warning. smbd/groupname.c: Remember
 to file_lines_free() on exit. tdb/tdb.h: Add tdb_traverse_func typedef.
 Jeremy (This used to be commit 204ca1195c86499bd9beb273ce573db7a56ccead)

---
 source3/locking/locking.c | 66 +++++++++++++++++++++++++++++++++++------------
 1 file changed, 49 insertions(+), 17 deletions(-)

(limited to 'source3/locking/locking.c')

diff --git a/source3/locking/locking.c b/source3/locking/locking.c
index 9ea9e08ded..bde1ffb567 100644
--- a/source3/locking/locking.c
+++ b/source3/locking/locking.c
@@ -60,6 +60,8 @@ void locking_close_file(files_struct *fsp)
 	 * Now release all the tdb locks.
 	 */
 
+	/* Placeholder for code here.... */
+#if 0
 	brl_close(fsp->dev, fsp->inode, getpid(), fsp->conn->cnum, fsp->fnum);
 
 	/*
@@ -71,8 +73,7 @@ void locking_close_file(files_struct *fsp)
 	 * on *that* fd will get lost when we close this one. POSIX
 	 * braindamage... JRA.
 	 */
-
-	/* Placeholder for code here.... */
+#endif
 }
 
 /****************************************************************************
@@ -360,10 +361,15 @@ static BOOL set_posix_lock(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG_UIN
 	if(!posix_lock_in_range(&offset, &count, u_offset, u_count))
 		return True;
 
-    ret = fcntl_lock(fsp->fd,SMB_F_SETLK,offset,count,map_posix_lock_type(fsp,lock_type)); 
+	/*
+	 * Note that setting multiple overlapping read locks on different
+	 * file descriptors will not be held separately by the kernel (POSIX
+	 * braindamage), but will be merged into one continuous read lock
+	 * range. We cope with this case in the release_posix_lock code
+	 * below. JRA.
+	 */
 
-	if(ret)
-		fsp->num_posix_locks++;
+    ret = fcntl_lock(fsp->fd,SMB_F_SETLK,offset,count,map_posix_lock_type(fsp,lock_type)); 
 
 	return ret;
 }
@@ -377,11 +383,23 @@ static BOOL release_posix_lock(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG
 {
 	SMB_OFF_T offset;
 	SMB_OFF_T count;
-	BOOL ret;
+	BOOL ret = True;
 
 	DEBUG(5,("release_posix_lock: File %s, offset = %.0f, count = %.0f\n",
 			fsp->fsp_name, (double)offset, (double)count ));
 
+	if(u_count == 0) {
+
+		/*
+		 * This lock must overlap with an existing read-only lock
+		 * help by another fd. Just decrement the count but don't
+		 * do any POSIX call.
+		 */
+
+		fsp->num_posix_locks--;
+		return True;
+	}
+
 	/*
 	 * If the requested lock won't fit in the POSIX range, we will
 	 * pretend it was successful.
@@ -422,12 +440,9 @@ BOOL is_locked(files_struct *fsp,connection_struct *conn,
 	/*
 	 * There is no lock held by an SMB daemon, check to
 	 * see if there is a POSIX lock from a UNIX or NFS process.
-	 * Note that as an optimisation we only bother to
-	 * check this if the file is not exclusively
-	 * oplocked. JRA.
 	 */
 
-	if(!ret && !EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && lp_posix_locking(snum))
+	if(!ret && lp_posix_locking(snum))
 		ret = is_posix_locked(fsp, offset, count, lock_type);
 
 	return ret;
@@ -465,11 +480,13 @@ BOOL do_lock(files_struct *fsp,connection_struct *conn,
 
 			/*
 			 * Try and get a POSIX lock on this range.
+			 * Note that this is ok if it is a read lock
+			 * overlapping on a different fd. JRA.
 			 */
 
-			ok = set_posix_lock(fsp, offset, count, lock_type);
-
-			if(!ok) {
+			if((ok = set_posix_lock(fsp, offset, count, lock_type)) == True)
+				fsp->num_posix_locks++;
+			else {
 				/*
 				 * We failed to map - we must now remove the brl
 				 * lock entry.
@@ -506,18 +523,33 @@ BOOL do_unlock(files_struct *fsp,connection_struct *conn,
 		  (double)offset, (double)count, fsp->fsp_name ));
 	
 	if (OPEN_FSP(fsp) && fsp->can_lock && (fsp->conn == conn)) {
-		ok = brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
-				global_smbpid, getpid(), conn->cnum, 
-				offset, count);
 
-		if(ok && lp_posix_locking(SNUM(conn))) {
+		if(lp_posix_locking(SNUM(conn))) {
+
+#if 0
+			/*
+			 * The following call calculates if there are any
+			 * overlapping read locks held by this process on
+			 * other fd's open on the same file and truncates
+			 * any overlapping range and returns the value in
+			 * the non_overlap_XXX variables. Thus the POSIX
+			 * unlock may not be done on the same region as
+			 * the brl_lock. JRA.
+			 */
+
+			brl_unlock_list(fsp->dev, fsp->inode, fsp->fnum,
+#endif
 
 			/*
 			 * Release the POSIX lock on this range.
 			 */
 
 			(void)release_posix_lock(fsp, offset, count);
+			fsp->num_posix_locks--;
 		}
+
+		ok = brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
+				global_smbpid, getpid(), conn->cnum, offset, count);
 	}
    
 	if (!ok) {
-- 
cgit