From d71c04f927cbcbaae0708c1533748caac20ee5af Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Sun, 4 Oct 1998 04:48:17 +0000
Subject: use dummy file descriptors opened on /dev/null to ensure that the
 smbw file descriptor allocation order is identical to the kernels. (This used
 to be commit 60a683465647932f7241ba9f92443d5e5294e20b)

---
 source3/include/proto.h       |  1 +
 source3/lib/bitmap.c          |  2 +-
 source3/smbwrapper/smbw.c     | 16 ++++++++++------
 source3/smbwrapper/smbw.h     |  3 +--
 source3/smbwrapper/smbw_dir.c | 13 ++++++++++---
 5 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/source3/include/proto.h b/source3/include/proto.h
index 932621ce9a..78863b5984 100644
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -55,6 +55,7 @@ BOOL check_access(int sock, char *allow_list, char *deny_list);
 struct bitmap *bitmap_allocate(int n);
 BOOL bitmap_set(struct bitmap *bm, unsigned i);
 BOOL bitmap_clear(struct bitmap *bm, unsigned i);
+BOOL bitmap_query(struct bitmap *bm, unsigned i);
 int bitmap_find(struct bitmap *bm, unsigned ofs);
 
 /*The following definitions come from  lib/charcnv.c  */
diff --git a/source3/lib/bitmap.c b/source3/lib/bitmap.c
index 9ccdbb420b..93c821c528 100644
--- a/source3/lib/bitmap.c
+++ b/source3/lib/bitmap.c
@@ -81,7 +81,7 @@ BOOL bitmap_clear(struct bitmap *bm, unsigned i)
 /****************************************************************************
 query a bit in a bitmap
 ****************************************************************************/
-static BOOL bitmap_query(struct bitmap *bm, unsigned i)
+BOOL bitmap_query(struct bitmap *bm, unsigned i)
 {
 	if (i >= bm->n) return False;
 	if (bm->b[i/32] & (1<<(i%32))) {
diff --git a/source3/smbwrapper/smbw.c b/source3/smbwrapper/smbw.c
index d79131a8ea..11192bedd7 100644
--- a/source3/smbwrapper/smbw.c
+++ b/source3/smbwrapper/smbw.c
@@ -95,7 +95,7 @@ determine if a file descriptor is a smb one
 int smbw_fd(int fd)
 {
 	if (smbw_busy) return 0;
-	return (fd >= SMBW_FD_OFFSET);
+	return smbw_file_bmap && bitmap_query(smbw_file_bmap, fd);
 }
 
 /***************************************************** 
@@ -523,16 +523,19 @@ int smbw_open(const char *fname, int flags, mode_t mode)
 		goto failed;
 	}
 	file->srv = srv;
-	file->fd = bitmap_find(smbw_file_bmap, 0);
-
+	file->fd = open("/dev/null", O_WRONLY);
 	if (file->fd == -1) {
 		errno = EMFILE;
 		goto failed;
 	}
 
-	bitmap_set(smbw_file_bmap, file->fd);
+	if (bitmap_query(smbw_file_bmap, file->fd)) {
+		DEBUG(0,("ERROR: fd used in smbw_open\n"));
+		errno = EIO;
+		goto failed;
+	}
 
-	file->fd += SMBW_FD_OFFSET;
+	bitmap_set(smbw_file_bmap, file->fd);
 
 	DLIST_ADD(smbw_files, file);
 
@@ -648,7 +651,8 @@ int smbw_close(int fd)
 	}
 
 
-	bitmap_clear(smbw_file_bmap, file->fd - SMBW_FD_OFFSET);
+	bitmap_clear(smbw_file_bmap, file->fd);
+	close(file->fd);
 	
 	DLIST_REMOVE(smbw_files, file);
 
diff --git a/source3/smbwrapper/smbw.h b/source3/smbwrapper/smbw.h
index 716205c1fc..5fc864456e 100644
--- a/source3/smbwrapper/smbw.h
+++ b/source3/smbwrapper/smbw.h
@@ -21,9 +21,8 @@
 
 #define SMBW_PREFIX "/smb/"
 
-#define SMBW_FD_OFFSET 700
 #define SMBW_CLI_FD 512
-#define SMBW_MAX_OPEN 2048
+#define SMBW_MAX_OPEN 8192
 
 #define SMBW_FILE_MODE (S_IFREG | 0644)
 #define SMBW_DIR_MODE (S_IFDIR | 0755)
diff --git a/source3/smbwrapper/smbw_dir.c b/source3/smbwrapper/smbw_dir.c
index 22da76eb17..c437a53e1f 100644
--- a/source3/smbwrapper/smbw_dir.c
+++ b/source3/smbwrapper/smbw_dir.c
@@ -175,17 +175,23 @@ int smbw_dir_open(const char *fname)
 
 	cur_dir = NULL;
 	
-	fd = bitmap_find(smbw_file_bmap, 0);
+	fd = open("/dev/null", O_WRONLY);
 	if (fd == -1) {
 		errno = EMFILE;
 		goto failed;
 	}
 
+	if (bitmap_query(smbw_file_bmap, fd)) {
+		DEBUG(0,("ERROR: fd used in smbw_dir_open\n"));
+		errno = EIO;
+		goto failed;
+	}
+
 	DLIST_ADD(smbw_dirs, dir);
 	
 	bitmap_set(smbw_file_bmap, fd);
 
-	dir->fd = fd + SMBW_FD_OFFSET;
+	dir->fd = fd;
 	dir->srv = srv;
 	dir->path = strdup(s);
 
@@ -241,7 +247,8 @@ int smbw_dir_close(int fd)
 		return -1;
 	}
 
-	bitmap_clear(smbw_file_bmap, dir->fd - SMBW_FD_OFFSET);
+	bitmap_clear(smbw_file_bmap, dir->fd);
+	close(dir->fd);
 	
 	DLIST_REMOVE(smbw_dirs, dir);
 
-- 
cgit