[freenos] r286 committed - Added implementation of FileSystemMount and FileDescriptor....
- From: codesite-noreply@xxxxxxxxxx
- To: freenos@xxxxxxxxxxxxx
- Date: Sun, 02 Aug 2009 13:43:49 +0000
Revision: 286
Author: nieklinnenbank
Date: Sun Aug 2 05:18:40 2009
Log: Added implementation of FileSystemMount and FileDescriptor.
These simple data objects are shared among all processes in FreeNOS.
The FileSystemMounts table is used by processes to find the mounted
filesystems,
and obtain the ProcessID of the FileSystem to initiate IPC. FileDescriptors
contain
the current position in the file, an identity field (may contain e.g. an
memory pointer
or minor device id) and the ProcessID of which FileSystem or Device serves
the file.
http://code.google.com/p/freenos/source/detail?r=286
Added:
/trunk/srv/filesystem/FileDescriptor.h
/trunk/srv/filesystem/FileSystemMount.h
=======================================
--- /dev/null
+++ /trunk/srv/filesystem/FileDescriptor.h Sun Aug 2 05:18:40 2009
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2009 Niek Linnenbank
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __FILESYSTEM_FILE_DESCRIPTOR_H
+#define __FILESYSTEM_FILE_DESCRIPTOR_H
+
+#include "FileSystemMount.h"
+#include <Array.h>
+#include <Shared.h>
+#include <Types.h>
+#include <Macros.h>
+
+/** File descriptor table key prefix. */
+#define FILE_DESCRIPTOR_KEY "FileDescriptor/"
+
+/** Maximum number of open file descriptors. */
+#define FILE_DESCRIPTOR_MAX 1024
+
+/**
+ * Abstracts a file which is opened by a user process.
+ */
+typedef struct FileDescriptor
+{
+ /**
+ * Constructor function.
+ * @param mnt ProcessID of the filesystem server.
+ * @param ident Unique identifier.
+ */
+ FileDescriptor(ProcessID mnt, Address ident)
+ : mount(mnt), identifier(ident), position(ZERO)
+ {
+ }
+
+ /** Filesystem server on which this file was opened. */
+ ProcessID mount;
+
+ /** Unique identifier, used by the underlying filesystem. */
+ Address identifier;
+
+ /** Current position indicator. */
+ Size position;
+}
+FileDescriptor;
+
+/**
+ * Retrieve a pointer to the FileDescriptor table.
+ * @param files Per-process FileDescriptor table.
+ * @param procID Process Identity number.
+ * @return Pointer to the (shared) FileDescriptor table.
+ */
+inline Shared<FileDescriptor> *
getFileDescriptors(Array<Shared<FileDescriptor> > *files,
+ ProcessID procID)
+{
+ Shared<FileDescriptor> *fds;
+ char key[128];
+
+ /* Do we have it loaded already? */
+ if ((fds = files->get(procID)))
+ {
+ return fds;
+ }
+ /* Construct key. */
+ snprintf(key, sizeof(key), "%s%u", FILE_DESCRIPTOR_KEY, procID);
+
+ /* Load the object. */
+ fds = new Shared<FileDescriptor>(key, FILE_DESCRIPTOR_MAX);
+
+ /* Store in our Array. */
+ files->insert(procID, fds);
+
+ /* Done. */
+ return fds;
+}
+
+/**
+ * Retrieve a pointer to the FileDescriptor of the given index.
+ * @param procID Process Identity.
+ * @param index Index number of the FileDescriptor in the table.
+ */
+inline FileDescriptor * getFileDescriptor(Array<Shared<FileDescriptor> >
*files,
+ ProcessID procID, int index)
+{
+ return getFileDescriptors(files, procID)->get(index);
+}
+
+#endif /* __FILESYSTEM_FILE_DESCRIPTOR_H */
=======================================
--- /dev/null
+++ /trunk/srv/filesystem/FileSystemMount.h Sun Aug 2 05:18:40 2009
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2009 Niek Linnenbank
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __FILESYSTEM_FILE_SYSTEM_MOUNT_H
+#define __FILESYSTEM_FILE_SYSTEM_MOUNT_H
+
+#include "FileSystemPath.h"
+#include <Types.h>
+
+/** Maximum number of mounted filesystems. */
+#define MAX_MOUNTS 16
+
+/** Shared mapping key for the mounts table. */
+#define FILE_SYSTEM_MOUNT_KEY "FileSystemMount"
+
+/**
+ * Represents a mounted filesystem.
+ */
+typedef struct FileSystemMount
+{
+ /** Path of the mount. */
+ char path[PATHLEN];
+
+ /** Server which is responsible for the mount. */
+ ProcessID procID;
+
+ /** Mount options. */
+ ulong options;
+}
+FileSystemMount;
+
+#endif /* __FILESYSTEM_FILE_SYSTEM_MOUNT_H */
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