Imported sourcesstart

8 files changed, 648 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..aedd26d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,33 @@
+CC = gcc
+
+KCFLAGS = -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -pipe
+KCPPFLAGS = -I /lib/modules/`uname -r`/build/include/ -D__KERNEL__ -DMODULE -D_LOOSE_KERNEL_NAMES
+
+CFLAGS = -Wall -W -g
+CPPFLAGS = 
+
+all: fuse.o fusemount
+
+dev.o: dev.c
+	$(CC) $(KCFLAGS) $(KCPPFLAGS) -c dev.c
+
+inode.o: inode.c
+	$(CC) $(KCFLAGS) $(KCPPFLAGS) -c inode.c
+
+dir.o: dir.c
+	$(CC) $(KCFLAGS) $(KCPPFLAGS) -c dir.c
+
+main.o: main.c
+	$(CC) $(KCFLAGS) $(KCPPFLAGS) -c main.c
+
+fuse_objs = dev.o inode.o dir.o main.o
+
+fuse.o: $(fuse_objs)
+	ld -r -o fuse.o $(fuse_objs)
+
+fusemount: fusemount.o
+
+clean:
+	rm -f *.o
+	rm -f fusemount
+	rm -f *~
diff --git a/dev.c b/dev.c
new file mode 100644
index 0000000..c7dd247
--- /dev/null
+++ b/dev.c
@@ -0,0 +1,133 @@
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001  Miklos Szeredi (mszeredi@inf.bme.hu)
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+#include "fuse_i.h"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/poll.h>
+#include <linux/file.h>
+#include <linux/proc_fs.h>
+
+static struct proc_dir_entry *proc_fs_fuse;
+struct proc_dir_entry *proc_fuse_dev;
+
+static ssize_t fuse_dev_read(struct file *file, char *buf, size_t nbytes,
+			     loff_t *off)
+{
+	printk(KERN_DEBUG "fuse_dev_read\n");
+	return 0;
+}
+
+static ssize_t fuse_dev_write(struct file *file, const char *buf,
+				size_t nbytes, loff_t *off)
+{
+	printk(KERN_DEBUG "fuse_dev_write <%.*s>\n", (int) nbytes, buf);
+	return nbytes;
+}
+
+
+static unsigned int fuse_dev_poll(struct file *file, poll_table *wait)
+{
+	printk(KERN_DEBUG "fuse_dev_poll\n");
+	return 0;
+}
+
+static int fuse_dev_open(struct inode *inode, struct file *file)
+{
+	int res;
+	struct fuse_conn *fc;
+
+	printk(KERN_DEBUG "fuse_dev_open\n");
+
+	res = -ENOMEM;
+	fc = kmalloc(sizeof(*fc), GFP_KERNEL);
+	if(!fc)
+		goto out;
+	
+	fc->sb = NULL;
+	fc->file = file;
+	
+	lock_kernel();
+	file->private_data = fc;
+	unlock_kernel();
+	res = 0;
+	
+  out:
+	return res;
+}
+
+static int fuse_dev_release(struct inode *inode, struct file *file)
+{
+	struct fuse_conn *fc = file->private_data;
+
+	printk(KERN_DEBUG "fuse_dev_release\n");
+
+	lock_kernel();
+	fc->file = NULL;
+	fuse_release_conn(fc);
+	unlock_kernel();
+	return 0;
+}
+
+static struct file_operations fuse_dev_operations = {
+	owner:		THIS_MODULE,
+	read:		fuse_dev_read,
+	write:		fuse_dev_write,
+	poll:		fuse_dev_poll,
+	open:		fuse_dev_open,
+	release:	fuse_dev_release,
+};
+
+int fuse_dev_init()
+{
+	int res;
+
+	proc_fs_fuse = NULL;
+	proc_fuse_dev = NULL;
+
+	res = -EIO;
+	proc_fs_fuse = proc_mkdir("fuse", proc_root_fs);
+	if(!proc_fs_fuse) {
+		printk("fuse: failed to create directory in /proc/fs\n");
+		goto err;
+	}
+
+	proc_fs_fuse->owner = THIS_MODULE;
+	proc_fuse_dev = create_proc_entry("dev", S_IFSOCK | S_IRUGO | S_IWUGO,
+					  proc_fs_fuse);
+	if(!proc_fuse_dev) {
+		printk("fuse: failed to create entry in /proc/fs/fuse\n");
+		goto err;
+	}
+
+	proc_fuse_dev->proc_fops = &fuse_dev_operations;
+
+	return 0;
+
+  err:
+	fuse_dev_cleanup();
+	return res;
+
+}
+
+void fuse_dev_cleanup()
+{
+	if(proc_fs_fuse) {
+		remove_proc_entry("dev", proc_fs_fuse);
+		remove_proc_entry("fuse", proc_root_fs);
+	}
+}
+
+/* 
+ * Local Variables:
+ * indent-tabs-mode: t
+ * c-basic-offset: 8
+ * End:
+ */
diff --git a/dir.c b/dir.c
new file mode 100644
index 0000000..afa6106
--- /dev/null
+++ b/dir.c
@@ -0,0 +1,87 @@
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001  Miklos Szeredi (mszeredi@inf.bme.hu)
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+
+#include "fuse.h"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+
+static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry)
+{
+	printk(KERN_DEBUG "fuse_lookup: %li\n", dir->i_ino);
+
+	return NULL;
+}
+
+static int fuse_permission(struct inode *inode, int mask)
+{
+	printk(KERN_DEBUG "fuse_permission: %li, 0%o\n", inode->i_ino, mask);
+
+	return 0;
+}
+
+static int fuse_revalidate(struct dentry *dentry)
+{
+	printk(KERN_DEBUG "fuse_revalidate: %li\n",
+	       dentry->d_inode->i_ino);
+	
+	return 0;
+}
+static int fuse_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+	printk(KERN_DEBUG "fuse_readdir: %li\n",
+	       file->f_dentry->d_inode->i_ino);
+	
+	return 0;
+}
+
+static int fuse_open(struct inode *inode, struct file *file)
+{
+	printk(KERN_DEBUG "fuse_open: %li\n", inode->i_ino);
+
+	return 0;
+}
+
+static int fuse_release(struct inode *inode, struct file *file)
+{
+	printk(KERN_DEBUG "fuse_release: %li\n", inode->i_ino);
+
+	return 0;
+}
+
+static struct inode_operations fuse_dir_inode_operations =
+{
+	lookup:		fuse_lookup,
+	permission:	fuse_permission,
+        revalidate:	fuse_revalidate,
+};
+
+static struct file_operations fuse_dir_operations = {
+	read:		generic_read_dir,
+	readdir:	fuse_readdir,
+	open:		fuse_open,
+	release:	fuse_release,
+};
+
+void fuse_dir_init(struct inode *inode)
+{
+	inode->i_op = &fuse_dir_inode_operations;
+	inode->i_fop = &fuse_dir_operations;
+}
+
+
+/* 
+ * Local Variables:
+ * indent-tabs-mode: t
+ * c-basic-offset: 8
+ * End:
+ */
diff --git a/fuse.h b/fuse.h
new file mode 100644
index 0000000..df71221
--- /dev/null
+++ b/fuse.h
@@ -0,0 +1,17 @@
+/* -*- indent-tabs-mode: t; c-basic-offset: 8; -*- */
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001  Miklos Szeredi (mszeredi@inf.bme.hu)
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+
+#define FUSE_MOUNT_VERSION 1
+
+struct fuse_mount_data {
+	int version;
+	int fd;
+};
+
diff --git a/fuse_i.h b/fuse_i.h
new file mode 100644
index 0000000..5e1cc1c
--- /dev/null
+++ b/fuse_i.h
@@ -0,0 +1,69 @@
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001  Miklos Szeredi (mszeredi@inf.bme.hu)
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+#include <linux/fs.h>
+
+#define FUSE_VERSION "0.1"
+
+/**
+ * A Fuse connection.
+ *
+ * This structure is created, when the client device is opened, and is
+ * destroyed, when the client device is closed _and_ the filesystem is
+ * umounted.
+ */
+struct fuse_conn {
+	/** The superblock of the mounted filesystem */
+	struct super_block *sb;
+	
+	/** The opened client device */
+	struct file *file;
+};
+
+/**
+ * The proc entry for the client device ("/proc/fs/fuse/dev")
+ */
+extern struct proc_dir_entry *proc_fuse_dev;
+
+/**
+ * Fill in the directory operations
+ */
+void fuse_dir_init(struct inode *inode);
+
+
+/**
+ * Check if the connection can be released, and if yes, then free the
+ * connection structure
+ */
+void fuse_release_conn(struct fuse_conn *fc);
+
+/**
+ * Initialize the client device
+ */
+int fuse_dev_init(void);
+
+/**
+ * Cleanup the client device
+ */
+void fuse_dev_cleanup(void);
+
+/**
+ * Initialize the fuse filesystem 
+ */
+int fuse_fs_init(void);
+
+/**
+ * Cleanup the fuse filesystem
+ */
+void fuse_fs_cleanup(void);
+
+/*
+ * Local Variables:
+ * indent-tabs-mode: t
+ * c-basic-offset: 8
+ */
diff --git a/fusemount.c b/fusemount.c
new file mode 100644
index 0000000..b4d3bc0
--- /dev/null
+++ b/fusemount.c
@@ -0,0 +1,87 @@
+/*
+    AVFS: A Virtual File System Library
+    Copyright (C) 1998-2001  Miklos Szeredi (mszeredi@inf.bme.hu)
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+#include "fuse.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <mntent.h>
+
+
+int mount_fuse(const char *dev, const char *dir, int devfd)
+{
+    int res;
+    const char *type;
+    FILE *fd;
+    struct mntent ent;
+    struct fuse_mount_data data;
+    
+    data.version = FUSE_MOUNT_VERSION;
+    data.fd = devfd;
+
+    type = "fuse";
+    res = mount(dev, dir, type, MS_MGC_VAL | MS_NOSUID | MS_NODEV, &data);
+    
+    if(res == -1) {
+        fprintf(stderr, "mount failed: %s\n", strerror(errno));
+	return -1;
+    }
+    
+    fd = setmntent("/etc/mtab", "a");
+    if(fd == NULL) {
+	fprintf(stderr, "setmntent(\"/etc/mtab\") failed: %s\n",
+		strerror(errno));
+	return -1;
+    }
+    
+    ent.mnt_fsname = (char *) dev;
+    ent.mnt_dir = (char *) dir;
+    ent.mnt_type = (char *) type;
+    ent.mnt_opts = "rw,nosuid,nodev";
+    ent.mnt_freq = 0;
+    ent.mnt_passno = 0;
+    res = addmntent(fd, & ent);
+    if(res != 0)
+	fprintf(stderr, "addmntent() failed: %s\n", strerror(errno));
+    
+    endmntent(fd);
+    
+    return 0;
+}
+
+int main(int argc, char *argv[])
+{
+    const char *dev;
+    const char *dir;
+    int devfd;
+
+    if(argc < 3) {
+        fprintf(stderr, "usage: %s dev dir\n", argv[0]);
+        exit(1);
+    }
+
+    dev = argv[1];
+    dir = argv[2];
+
+    devfd = open(dev, O_RDWR);
+    if(devfd == -1) {
+        fprintf(stderr, "failed to open %s: %s\n", dev, strerror(errno));
+        exit(1);
+    }
+
+    mount_fuse(dev, dir, devfd);
+
+    sleep(1000);
+
+    return 0;
+}
diff --git a/inode.c b/inode.c
new file mode 100644
index 0000000..77040fc
--- /dev/null
+++ b/inode.c
@@ -0,0 +1,161 @@
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001  Miklos Szeredi (mszeredi@inf.bme.hu)
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+#include "fuse.h"
+#include "fuse_i.h"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+
+#define FUSE_SUPER_MAGIC 0x65735546
+
+static void fuse_read_inode(struct inode *inode)
+{
+	printk(KERN_DEBUG "fuse_read_inode: %li\n", inode->i_ino);
+
+	
+}
+
+static void fuse_put_super(struct super_block *sb)
+{
+	struct fuse_conn *fc = sb->u.generic_sbp;
+
+	printk(KERN_DEBUG "fuse_put_super\n");
+
+	fc->sb = NULL;
+	fuse_release_conn(fc);
+}
+
+static struct super_operations fuse_super_operations = {
+	read_inode:	fuse_read_inode,
+	put_super:	fuse_put_super,
+};
+
+
+static struct fuse_conn *get_conn(struct fuse_mount_data *d)
+{
+	struct fuse_conn *fc = NULL;
+	struct file *file;
+	struct inode *ino;
+
+	printk(KERN_DEBUG "fuse_read_super\n");
+
+	if(d == NULL) {
+		printk("fuse_read_super: Bad mount data\n");
+		return NULL;
+	}
+
+	if(d->version != FUSE_MOUNT_VERSION) {
+		printk("fuse_read_super: Bad mount version: %i\n", d->version);
+		return NULL;
+	}
+
+	file = fget(d->fd);
+	ino = NULL;
+	if(file)
+		ino = file->f_dentry->d_inode;
+	
+	if(!ino || ino->u.generic_ip != proc_fuse_dev) {
+		printk("fuse_read_super: Bad file: %i\n", d->fd);
+		goto out;
+	}
+
+	fc = file->private_data;
+
+  out:
+	fput(file);
+	return fc;
+
+}
+
+static struct super_block *fuse_read_super(struct super_block *sb, 
+					   void *data, int silent)
+{	
+	struct fuse_conn *fc;
+	struct inode *root;
+
+	fc = get_conn(data);
+	if(fc == NULL)
+		goto err;
+
+	if(fc->sb != NULL) {
+		printk("fuse_read_super: file already mounted\n");
+		goto err;
+	}
+
+        sb->u.generic_sbp = fc;
+        sb->s_blocksize = 1024;
+        sb->s_blocksize_bits = 10;
+        sb->s_magic = FUSE_SUPER_MAGIC;
+        sb->s_op = &fuse_super_operations;
+
+	root = iget(sb, 1);
+	if(!root) {
+		printk("fuse_read_super: failed to get root inode\n");
+		goto err;
+	}
+
+	printk(KERN_DEBUG "root inode: %ld/%d\n", root->i_ino, root->i_dev);
+
+	root->i_mode = S_IFDIR;
+	root->i_uid = 0;
+	root->i_gid = 0;
+	root->i_nlink = 2;
+	root->i_size = 0;
+	root->i_blksize = 1024;
+	root->i_blocks = 0;
+	root->i_atime = CURRENT_TIME;
+	root->i_mtime = CURRENT_TIME;
+	root->i_ctime = CURRENT_TIME;
+	fuse_dir_init(root);
+
+	sb->s_root = d_alloc_root(root);
+	if(!sb->s_root) {
+		printk("fuse_read_super: failed to allocate root dentry\n");
+		goto err_iput;
+	}
+
+	fc->sb = sb;
+
+	return sb;
+
+  err_iput:
+	iput(root);
+  err:
+	return NULL;
+}
+
+
+static DECLARE_FSTYPE(fuse_fs_type, "fuse", fuse_read_super, 0);
+
+int fuse_fs_init()
+{
+	int res;
+
+	res = register_filesystem(&fuse_fs_type);
+	if(res)
+		printk("fuse: failed to register filesystem\n");
+
+	return res;
+}
+
+void fuse_fs_cleanup()
+{
+	unregister_filesystem(&fuse_fs_type);
+}
+
+/* 
+ * Local Variables:
+ * indent-tabs-mode: t
+ * c-basic-offset: 8
+ * End:
+ */
+
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..fa4ca8c
--- /dev/null
+++ b/main.c
@@ -0,0 +1,61 @@
+/*
+    FUSE: Filesystem in Userspace
+    Copyright (C) 2001  Miklos Szeredi (mszeredi@inf.bme.hu)
+
+    This program can be distributed under the terms of the GNU GPL.
+    See the file COPYING.
+*/
+
+#include "fuse_i.h"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+
+#define FUSE_VERSION "0.1"
+
+
+void fuse_release_conn(struct fuse_conn *fc)
+{
+	if(fc->sb == NULL && fc->file == NULL) {
+		printk(KERN_DEBUG "fuse: release connection\n");
+		kfree(fc);
+	}
+}
+
+int init_module(void)
+{
+	int res;
+
+	printk(KERN_DEBUG "fuse init (version %s)\n", FUSE_VERSION);
+
+	res = fuse_fs_init();
+	if(res)
+		goto err;
+	
+	res = fuse_dev_init();
+	if(res)
+		goto err_fs_cleanup;
+	
+	return 0;
+
+  err_fs_cleanup:
+	fuse_fs_cleanup();
+  err:
+	return res;
+}
+
+void cleanup_module(void)
+{
+	printk(KERN_DEBUG "fuse cleanup\n");
+	
+	fuse_fs_cleanup();
+	fuse_dev_cleanup();
+}
+
+/*
+ * Local Variables:
+ * indent-tabs-mode: t
+ * c-basic-offset: 8
+ */