r3127: added the initial code for the open files database. Doesn't do

anything yet, but will soon be the core of the shares modes code.
(This used to be commit ad1edabf95)

source4/ntvfs/common/opendb.c

@@ -0,0 +1,145 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Andrew Tridgell 2004
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+  this is the open files database. It implements shared storage of
+  what files are open between server instances, and implements the rules
+  of shared access to files.
+
+  The caller needs to provide a file_key, which specifies what file
+  they are talking about. This needs to be a unique key across all
+  filesystems, and is usually implemented in terms of a device/inode
+  pair.
+
+  Before any operations can be performed the caller needs to establish
+  a lock on the record associated with file_key. That is done by
+  calling odb_lock(). The caller releases this lock by calling
+  talloc_free() on the returned handle.
+
+  All other operations on a record are done by passing the odb_lock()
+  handle back to this module. The handle contains internal
+  intformation about what file_key is being operated on.
+*/
+
+#include "includes.h"
+
+struct odb_context {
+	struct tdb_wrap *w;
+	servid_t server;
+	uint16_t tid;
+	void *messaging_ctx;
+};
+
+/* 
+   the database is indexed by a file_key, and contains entries of the
+   following form
+*/
+struct odb_entry {
+	servid_t server;
+	uint16_t tid;
+	uint16_t fnum;
+	uint32_t share_access;
+	uint32_t desired_access;
+	uint32_t create_options;
+};
+
+
+/*
+  an odb lock handle. You must obtain one of these using odb_lock() before doing
+  any other operations. 
+*/
+struct odb_lock {
+	struct odb_context *odb;
+	TDB_DATA key;
+};
+
+/*
+  Open up the openfiles.tdb database. Close it down using
+  talloc_free(). We need the messaging_ctx to allow for pending open
+  notifications.
+*/
+struct odb_context *odb_init(TALLOC_CTX *mem_ctx, servid_t server, uint16_t tid, 
+			     void *messaging_ctx)
+{
+	char *path;
+	struct odb_context *odb;
+
+	odb = talloc_p(mem_ctx, struct odb_context);
+	if (odb == NULL) {
+		return NULL;
+	}
+
+	path = lock_path(odb, "openfiles.tdb");
+	odb->w = tdb_wrap_open(odb, path, 0,  
+			       TDB_DEFAULT|TDB_CLEAR_IF_FIRST,
+			       O_RDWR|O_CREAT, 0600);
+	talloc_free(path);
+	if (odb->w == NULL) {
+		talloc_free(odb);
+		return NULL;
+	}
+
+	odb->server = server;
+	odb->tid = tid;
+	odb->messaging_ctx = messaging_ctx;
+
+	return odb;
+}
+
+/*
+  destroy a lock on the database
+*/
+static int odb_lock_destructor(void *ptr)
+{
+	struct odb_lock *lck = ptr;
+	tdb_chainunlock(lck->odb->w->tdb, lck->key);
+	return 0;
+}
+
+/*
+  get a lock on a entry in the odb. This call returns a lock handle,
+  which the caller should unlock using talloc_free().
+*/
+struct odb_lock *odb_lock(struct odb_context *odb, DATA_BLOB *file_key)
+{
+	struct odb_lock *lck;
+
+	lck = talloc_p(odb, struct odb_lock);
+	if (lck == NULL) {
+		return NULL;
+	}
+
+	lck->odb = odb;
+	lck->key.dptr = talloc_memdup(lck, file_key->data, file_key->length);
+	lck->key.dsize = file_key->length;
+	if (lck->key.dptr == NULL) {
+		talloc_free(lck);
+		return NULL;
+	}
+
+	if (tdb_chainlock(odb->w->tdb, lck->key) != 0) {
+		talloc_free(lck);
+		return NULL;
+	}
+
+	talloc_set_destructor(lck, odb_lock_destructor);
+	
+	return lck;
+}

source4/ntvfs/posix/config.mk

@@ -22,6 +22,7 @@ ADD_OBJ_FILES = \
 		ntvfs/posix/pvfs_shortname.o \
 		ntvfs/posix/pvfs_lock.o \
 		ntvfs/posix/pvfs_wait.o \
+		ntvfs/common/opendb.o \
 		ntvfs/common/brlock.o
 # End MODULE ntvfs_posix
 ################################################

source4/ntvfs/posix/vfs_posix.c

@@ -94,6 +94,14 @@ static NTSTATUS pvfs_connect(struct ntvfs_module_context *ntvfs,
 		return NT_STATUS_INTERNAL_DB_CORRUPTION;
 	}
 
+	pvfs->odb_context = odb_init(pvfs, 
+				     pvfs->tcon->smb_conn->connection->server_id,  
+				     pvfs->tcon->service,
+				     pvfs->tcon->smb_conn->connection->messaging_ctx);
+	if (pvfs->odb_context == NULL) {
+		return NT_STATUS_INTERNAL_DB_CORRUPTION;
+	}
+
 	/* allocate the fnum id -> ptr tree */
 	pvfs->idtree_fnum = idr_init(pvfs);
 	if (pvfs->idtree_fnum == NULL) {

source4/ntvfs/posix/vfs_posix.h

@@ -37,6 +37,7 @@ struct pvfs_state {
 	struct pvfs_mangle_context *mangle_ctx;
 
 	struct brl_context *brl_context;
+	struct odb_context *odb_context;
 
 	/* an id tree mapping open search ID to a pvfs_search_state structure */
 	void *idtree_search;