1 files changed, 204 insertions, 0 deletions
diff --git a/src/libs/uio/mounttree.h b/src/libs/uio/mounttree.h
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+++ b/src/libs/uio/mounttree.h
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+/*
+ * Copyright (C) 2003  Serge van den Boom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * Nota bene: later versions of the GNU General Public License do not apply
+ * to this program.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef LIBS_UIO_MOUNTTREE_H_
+#define LIBS_UIO_MOUNTTREE_H_
+
+#include <stdio.h>
+#include "mount.h"
+
+void uio_printMounts(FILE *outStream, const uio_Repository *repository);
+
+/* *** Internal definitions follow *** */
+#ifdef uio_INTERNAL
+
+#include <sys/types.h>
+
+typedef struct uio_MountTreeItem uio_MountTreeItem;
+typedef struct uio_MountTree uio_MountTree;
+typedef struct uio_MountInfo uio_MountInfo;
+
+#include "physical.h"
+#include "types.h"
+#include "uioport.h"
+#include "paths.h"
+
+
+/*
+ * A MountTree describes the relation between dirs (PRoot structures)
+ * mounted in a directory structure.
+ * A MountTree structure represents a node (a dir) in this directory
+ * structure.
+ * It describes what MountInfo structures apply in that dir and below (if
+ * not overrided in subnodes) (the 'pLocs' field).
+ * These path components are also linked together 'up'-wards (towards the
+ * root of the tree) by the 'up' field.
+ */
+
+struct uio_MountTreeItem {
+	struct uio_MountInfo *mountInfo;
+	int depth;
+			// 'mountInfo->pDirHandle' and 'depth' together point to a
+			// location in a physical tree. An uio_pDirHandle alone can't be
+			// used as the directory might not exist.
+			// So pDirHandle points to the top dir that was mounted, and
+			// 'depth' indicates how many directory names of the path to
+			// this point in the Mount Tree need to be followed.
+			// Example:
+			// This MountTreeItem is somewhere in a tree /foo/bar/bla
+			// and depth = 1. Then this MountTreeItem points to
+			// /bla in the specified root.
+	struct uio_MountTreeItem *next;
+			// The next MountTreeItem in a MountTree
+};
+
+struct uio_MountTree {
+	struct uio_MountTree *subTrees;
+			// Trees for subdirs in this MountTree
+	struct uio_MountTreeItem *pLocs;
+			// The physical locations that have effect in this MountTree.
+	struct uio_MountTree *upTree;
+			// the MountTree that pointed to this MountTree
+	struct uio_PathComp *comps;
+			// the names of the path components that lead to the tree.
+			// Not necessary every PathComp is connected to a MountTree.
+			// If you have /foo and /foo/bar/zut mounted, then
+			// there are MountTrees for /,  /foo and /foo/bar/zut,
+			// but there are PathComps for 'foo', 'bar' and 'zut'.
+	struct uio_PathComp *lastComp;
+			// The last PathComp of comps that pointed to this MountTree.
+			// This can be used to trace the path back to the top.
+	struct uio_MountTree *next;
+			// If this tree is a subTree of a tree, 'next' points to the
+			// next subTree of that tree.
+};
+
+/*
+ * A MountInfo structure describes how a physical structure was mounted.
+ * A physical structure can be used by several MountInfo structures.
+ */
+struct uio_MountInfo {
+	int flags;
+			/* Mount flags */
+#	define uio_MOUNTINFO_RDONLY uio_MOUNT_RDONLY
+	uio_FileSystemID fsID;
+	char *dirName;
+			/* The path inside the mounted fs leading to pDirHandle */
+	uio_PDirHandle *pDirHandle;
+			/* The pDirHandle belonging to this mount */
+	uio_MountTree *mountTree;
+			/* The MountTree node for the mountpoint */
+	uio_AutoMount **autoMount;
+	uio_MountHandle *mountHandle;
+};
+
+
+/*
+ *	Say we've got mounted (in order):
+ *	Bla -> /
+ *	Bar -> /foo/bar
+ *	Foo -> /foo
+ *	Zut -> /zut/123
+ *	Fop -> /zut/123
+ *
+ *  This will build a tree that looks like this:
+ *  (the strings between brackets are the mounted filesystems that have effect
+ *   in a dir, in order)
+ *
+ *  / (Bar)
+ *  	foo (Foo, Bla)
+ *  		bar (Foo, Bar, Bla)
+ *		zut/123 (Fop, Zut, Bla)
+ * 
+ *	The MountTree will look like:
+ *	/ = {
+ *		sub = {
+ *			/foo,
+ *			/zut/123
+ *		},
+ *	    pLocs = {
+ *	    	BlaDir:/ (0)
+ *	    }
+ *	}
+ *	/foo = {
+ *		sub = {
+ *			/foo/bar
+ *		},
+ *		pLocs = {
+ *			BlaDir:/foo (1),
+ *			FooDir:/ (0)
+ *		}
+ *	}
+ *	/foo/bar = {
+ *		sub = { },
+ *	    pLocs = {
+ *	    	BlaDir:/foo/bar (2),
+ *	    	BarDir:/ (0),
+ *	    	FooDir:/bar (1)
+ *	    }
+ *	}
+ *	/zut/123 = {
+ *		sub = { },
+ *		pLocs = {
+ *          FooDir:/ (0)
+ *          ZutDir:/ (0)
+ *			BlaDir:/zut/123 (2)
+ *		}
+ *	}
+ *
+ *	'BlaDir:/zut/123 (2)' means the pDirHandle is 'Bla', and the dir into
+ *  that directory is '/zut/123', but as this is always a postfix of the
+ *  path where we are, the number of dirs (the '(2)') is enough to store
+ *  (apart from the pDirHandle).
+ */
+
+uio_MountTree *uio_makeRootMountTree(void);
+void uio_MountTree_delete(uio_MountTree *tree);
+uio_MountTree *uio_mountTreeAddMountInfo(uio_Repository *repository,
+		uio_MountTree *mountTree, uio_MountInfo *mountInfo, const char *path,
+		uio_MountLocation location, const uio_MountInfo *relative);
+void uio_mountTreeRemoveMountInfo(uio_Repository *repository,
+		uio_MountTree *mountTree, uio_MountInfo *mountInfo);
+void uio_findMountTree(uio_MountTree *top, const char *path,
+		uio_MountTree **resTree, const char **pPath);
+char *uio_mountTreeItemRestPath(const uio_MountTreeItem *item,
+		uio_PathComp *endComp, const char *path);
+int uio_mountTreeCountPLocs(const uio_MountTree *tree);
+uio_MountInfo *uio_MountInfo_new(uio_FileSystemID fsID,
+		uio_MountTree *mountTree, uio_PDirHandle *pDirHandle,
+		char *dirName, uio_AutoMount **autoMount,
+		uio_MountHandle *mountHandle, int flags);
+void uio_MountInfo_delete(uio_MountInfo *mountInfo);
+void uio_printMountTree(FILE *outStream, const uio_MountTree *tree,
+		int indent);
+void uio_printMountTreeItem(FILE *outStream, const uio_MountTreeItem *item);
+void uio_printMountTreeItems(FILE *outStream, const uio_MountTreeItem *item);
+void uio_printPathToMountTree(FILE *outStream, const uio_MountTree *tree);
+void uio_printMountInfo(FILE *outStream, const uio_MountInfo *mountInfo);
+
+static inline uio_bool
+uio_mountInfoIsReadOnly(uio_MountInfo *mountInfo) {
+	return (mountInfo->flags & uio_MOUNTINFO_RDONLY) != 0;
+}
+
+#endif  /* uio_INTERNAL */
+
+#endif  /* LIBS_UIO_MOUNTTREE_H_ */
+