UML - Move hppfs_kern.c to hppfs.c

Index: linux-2.6-git/fs/hppfs/hppfs.c
===================================================================
@@ -0,0 +1,771 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/ctype.h>
+#include <linux/dcache.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/statfs.h>
+#include <linux/types.h>
+#include <asm/uaccess.h>
+#include "os.h"
+
+static struct inode *get_inode(struct super_block *, struct dentry *);
+
+struct hppfs_data {
+	struct list_head list;
+	char contents[PAGE_SIZE - sizeof(struct list_head)];
+};
+
+struct hppfs_private {
+	struct file *proc_file;
+	int host_fd;
+	loff_t len;
+	struct hppfs_data *contents;
+};
+
+struct hppfs_inode_info {
+	struct dentry *proc_dentry;
+	struct inode vfs_inode;
+};
+
+static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
+{
+	return container_of(inode, struct hppfs_inode_info, vfs_inode);
+}
+
+#define HPPFS_SUPER_MAGIC 0xb00000ee
+
+static const struct super_operations hppfs_sbops;
+
+static int is_pid(struct dentry *dentry)
+{
+	struct super_block *sb;
+	int i;
+
+	sb = dentry->d_sb;
+	if (dentry->d_parent != sb->s_root)
+		return 0;
+
+	for (i = 0; i < dentry->d_name.len; i++) {
+		if (!isdigit(dentry->d_name.name[i]))
+			return 0;
+	}
+	return 1;
+}
+
+static char *dentry_name(struct dentry *dentry, int extra)
+{
+	struct dentry *parent;
+	char *root, *name;
+	const char *seg_name;
+	int len, seg_len;
+
+	len = 0;
+	parent = dentry;
+	while (parent->d_parent != parent) {
+		if (is_pid(parent))
+			len += strlen("pid") + 1;
+		else len += parent->d_name.len + 1;
+		parent = parent->d_parent;
+	}
+
+	root = "proc";
+	len += strlen(root);
+	name = kmalloc(len + extra + 1, GFP_KERNEL);
+	if (name == NULL)
+		return NULL;
+
+	name[len] = '\0';
+	parent = dentry;
+	while (parent->d_parent != parent) {
+		if (is_pid(parent)) {
+			seg_name = "pid";
+			seg_len = strlen("pid");
+		}
+		else {
+			seg_name = parent->d_name.name;
+			seg_len = parent->d_name.len;
+		}
+
+		len -= seg_len + 1;
+		name[len] = '/';
+		strncpy(&name[len + 1], seg_name, seg_len);
+		parent = parent->d_parent;
+	}
+	strncpy(name, root, strlen(root));
+	return name;
+}
+
+static int file_removed(struct dentry *dentry, const char *file)
+{
+	char *host_file;
+	int extra, fd;
+
+	extra = 0;
+	if (file != NULL)
+		extra += strlen(file) + 1;
+
+	host_file = dentry_name(dentry, extra + strlen("/remove"));
+	if (host_file == NULL) {
+		printk(KERN_ERR "file_removed : allocation failed\n");
+		return -ENOMEM;
+	}
+
+	if (file != NULL) {
+		strcat(host_file, "/");
+		strcat(host_file, file);
+	}
+	strcat(host_file, "/remove");
+
+	fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
+	kfree(host_file);
+	if (fd > 0) {
+		os_close_file(fd);
+		return 1;
+	}
+	return 0;
+}
+
+static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
+				   struct nameidata *nd)
+{
+	struct dentry *proc_dentry, *new, *parent;
+	struct inode *inode;
+	int err, deleted;
+
+	deleted = file_removed(dentry, NULL);
+	if (deleted < 0)
+		return ERR_PTR(deleted);
+	else if (deleted)
+		return ERR_PTR(-ENOENT);
+
+	err = -ENOMEM;
+	parent = HPPFS_I(ino)->proc_dentry;
+	mutex_lock(&parent->d_inode->i_mutex);
+	proc_dentry = d_lookup(parent, &dentry->d_name);
+	if (proc_dentry == NULL) {
+		proc_dentry = d_alloc(parent, &dentry->d_name);
+		if (proc_dentry == NULL) {
+			mutex_unlock(&parent->d_inode->i_mutex);
+			goto out;
+		}
+		new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
+						       proc_dentry, NULL);
+		if (new) {
+			dput(proc_dentry);
+			proc_dentry = new;
+		}
+	}
+	mutex_unlock(&parent->d_inode->i_mutex);
+
+	if (IS_ERR(proc_dentry))
+		return proc_dentry;
+
+	err = -ENOMEM;
+	inode = get_inode(ino->i_sb, proc_dentry);
+	if (!inode)
+		goto out_dput;
+
+ 	d_add(dentry, inode);
+	return NULL;
+
+ out_dput:
+	dput(proc_dentry);
+ out:
+	return ERR_PTR(err);
+}
+
+static const struct inode_operations hppfs_file_iops = {
+};
+
+static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
+			 loff_t *ppos, int is_user)
+{
+	ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
+	ssize_t n;
+
+	read = file->f_path.dentry->d_inode->i_fop->read;
+
+	if (!is_user)
+		set_fs(KERNEL_DS);
+
+	n = (*read)(file, buf, count, &file->f_pos);
+
+	if (!is_user)
+		set_fs(USER_DS);
+
+	if (ppos)
+		*ppos = file->f_pos;
+	return n;
+}
+
+static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
+{
+	ssize_t n;
+	int cur, err;
+	char *new_buf;
+
+	n = -ENOMEM;
+	new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (new_buf == NULL) {
+		printk(KERN_ERR "hppfs_read_file : kmalloc failed\n");
+		goto out;
+	}
+	n = 0;
+	while (count > 0) {
+		cur = min_t(ssize_t, count, PAGE_SIZE);
+		err = os_read_file(fd, new_buf, cur);
+		if (err < 0) {
+			printk(KERN_ERR "hppfs_read : read failed, "
+			       "errno = %d\n", err);
+			n = err;
+			goto out_free;
+		} else if (err == 0)
+			break;
+
+		if (copy_to_user(buf, new_buf, err)) {
+			n = -EFAULT;
+			goto out_free;
+		}
+		n += err;
+		count -= err;
+	}
+ out_free:
+	kfree(new_buf);
+ out:
+	return n;
+}
+
+static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
+			  loff_t *ppos)
+{
+	struct hppfs_private *hppfs = file->private_data;
+	struct hppfs_data *data;
+	loff_t off;
+	int err;
+
+	if (hppfs->contents != NULL) {
+		int rem;
+
+		if (*ppos >= hppfs->len)
+			return 0;
+
+		data = hppfs->contents;
+		off = *ppos;
+		while (off >= sizeof(data->contents)) {
+			data = list_entry(data->list.next, struct hppfs_data,
+					  list);
+			off -= sizeof(data->contents);
+		}
+
+		if (off + count > hppfs->len)
+			count = hppfs->len - off;
+		rem = copy_to_user(buf, &data->contents[off], count);
+		*ppos += count - rem;
+		if (rem > 0)
+			return -EFAULT;
+	} else if (hppfs->host_fd != -1) {
+		err = os_seek_file(hppfs->host_fd, *ppos);
+		if (err) {
+			printk(KERN_ERR "hppfs_read : seek failed, "
+			       "errno = %d\n", err);
+			return err;
+		}
+		count = hppfs_read_file(hppfs->host_fd, buf, count);
+		if (count > 0)
+			*ppos += count;
+	}
+	else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
+
+	return count;
+}
+
+static ssize_t hppfs_write(struct file *file, const char __user *buf,
+			   size_t len, loff_t *ppos)
+{
+	struct hppfs_private *data = file->private_data;
+	struct file *proc_file = data->proc_file;
+	ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
+
+	write = proc_file->f_path.dentry->d_inode->i_fop->write;
+	return (*write)(proc_file, buf, len, ppos);
+}
+
+static int open_host_sock(char *host_file, int *filter_out)
+{
+	char *end;
+	int fd;
+
+	end = &host_file[strlen(host_file)];
+	strcpy(end, "/rw");
+	*filter_out = 1;
+	fd = os_connect_socket(host_file);
+	if (fd > 0)
+		return fd;
+
+	strcpy(end, "/r");
+	*filter_out = 0;
+	fd = os_connect_socket(host_file);
+	return fd;
+}
+
+static void free_contents(struct hppfs_data *head)
+{
+	struct hppfs_data *data;
+	struct list_head *ele, *next;
+
+	if (head == NULL)
+		return;
+
+	list_for_each_safe(ele, next, &head->list) {
+		data = list_entry(ele, struct hppfs_data, list);
+		kfree(data);
+	}
+	kfree(head);
+}
+
+static struct hppfs_data *hppfs_get_data(int fd, int filter,
+					 struct file *proc_file,
+					 struct file *hppfs_file,
+					 loff_t *size_out)
+{
+	struct hppfs_data *data, *new, *head;
+	int n, err;
+
+	err = -ENOMEM;
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL) {
+		printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
+		goto failed;
+	}
+
+	INIT_LIST_HEAD(&data->list);
+
+	head = data;
+	*size_out = 0;
+
+	if (filter) {
+		while ((n = read_proc(proc_file, data->contents,
+				      sizeof(data->contents), NULL, 0)) > 0)
+			os_write_file(fd, data->contents, n);
+		err = os_shutdown_socket(fd, 0, 1);
+		if (err) {
+			printk(KERN_ERR "hppfs_get_data : failed to shut down "
+			       "socket\n");
+			goto failed_free;
+		}
+	}
+	while (1) {
+		n = os_read_file(fd, data->contents, sizeof(data->contents));
+		if (n < 0) {
+			err = n;
+			printk(KERN_ERR "hppfs_get_data : read failed, "
+			       "errno = %d\n", err);
+			goto failed_free;
+		} else if (n == 0)
+			break;
+
+		*size_out += n;
+
+		if (n < sizeof(data->contents))
+			break;
+
+		new = kmalloc(sizeof(*data), GFP_KERNEL);
+		if (new == 0) {
+			printk(KERN_ERR "hppfs_get_data : data allocation "
+			       "failed\n");
+			err = -ENOMEM;
+			goto failed_free;
+		}
+
+		INIT_LIST_HEAD(&new->list);
+		list_add(&new->list, &data->list);
+		data = new;
+	}
+	return head;
+
+ failed_free:
+	free_contents(head);
+ failed:
+	return ERR_PTR(err);
+}
+
+static struct hppfs_private *hppfs_data(void)
+{
+	struct hppfs_private *data;
+
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return data;
+
+	*data = ((struct hppfs_private ) { .host_fd  		= -1,
+					   .len  		= -1,
+					   .contents 		= NULL } );
+	return data;
+}
+
+static int file_mode(int fmode)
+{
+	if (fmode == (FMODE_READ | FMODE_WRITE))
+		return O_RDWR;
+	if (fmode == FMODE_READ)
+		return O_RDONLY;
+	if (fmode == FMODE_WRITE)
+		return O_WRONLY;
+	return 0;
+}
+
+static int hppfs_open(struct inode *inode, struct file *file)
+{
+	struct hppfs_private *data;
+	struct vfsmount *proc_mnt;
+	struct dentry *proc_dentry;
+	char *host_file;
+	int err, fd, type, filter;
+
+	err = -ENOMEM;
+	data = hppfs_data();
+	if (data == NULL)
+		goto out;
+
+	host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
+	if (host_file == NULL)
+		goto out_free2;
+
+	proc_dentry = HPPFS_I(inode)->proc_dentry;
+	proc_mnt = inode->i_sb->s_fs_info;
+
+	/* XXX This isn't closed anywhere */
+	data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
+				      file_mode(file->f_mode));
+	err = PTR_ERR(data->proc_file);
+	if (IS_ERR(data->proc_file))
+		goto out_free1;
+
+	type = os_file_type(host_file);
+	if (type == OS_TYPE_FILE) {
+		fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
+		if (fd >= 0)
+			data->host_fd = fd;
+		else
+			printk(KERN_ERR "hppfs_open : failed to open '%s', "
+			       "errno = %d\n", host_file, -fd);
+
+		data->contents = NULL;
+	} else if (type == OS_TYPE_DIR) {
+		fd = open_host_sock(host_file, &filter);
+		if (fd > 0) {
+			data->contents = hppfs_get_data(fd, filter,
+							data->proc_file,
+							file, &data->len);
+			if (!IS_ERR(data->contents))
+				data->host_fd = fd;
+		} else
+			printk(KERN_ERR "hppfs_open : failed to open a socket "
+			       "in '%s', errno = %d\n", host_file, -fd);
+	}
+	kfree(host_file);
+
+	file->private_data = data;
+	return 0;
+
+ out_free1:
+	kfree(host_file);
+ out_free2:
+	free_contents(data->contents);
+	kfree(data);
+ out:
+	return err;
+}
+
+static int hppfs_dir_open(struct inode *inode, struct file *file)
+{
+	struct hppfs_private *data;
+	struct vfsmount *proc_mnt;
+	struct dentry *proc_dentry;
+	int err;
+
+	err = -ENOMEM;
+	data = hppfs_data();
+	if (data == NULL)
+		goto out;
+
+	proc_dentry = HPPFS_I(inode)->proc_dentry;
+	proc_mnt = inode->i_sb->s_fs_info;
+	data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
+				      file_mode(file->f_mode));
+	err = PTR_ERR(data->proc_file);
+	if (IS_ERR(data->proc_file))
+		goto out_free;
+
+	file->private_data = data;
+	return 0;
+
+ out_free:
+	kfree(data);
+ out:
+	return err;
+}
+
+static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
+{
+	struct hppfs_private *data = file->private_data;
+	struct file *proc_file = data->proc_file;
+	loff_t (*llseek)(struct file *, loff_t, int);
+	loff_t ret;
+
+	llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
+	if (llseek != NULL) {
+		ret = (*llseek)(proc_file, off, where);
+		if (ret < 0)
+			return ret;
+	}
+
+	return default_llseek(file, off, where);
+}
+
+static const struct file_operations hppfs_file_fops = {
+	.owner		= NULL,
+	.llseek		= hppfs_llseek,
+	.read		= hppfs_read,
+	.write		= hppfs_write,
+	.open		= hppfs_open,
+};
+
+struct hppfs_dirent {
+	void *vfs_dirent;
+	filldir_t filldir;
+	struct dentry *dentry;
+};
+
+static int hppfs_filldir(void *d, const char *name, int size,
+			 loff_t offset, u64 inode, unsigned int type)
+{
+	struct hppfs_dirent *dirent = d;
+
+	if (file_removed(dirent->dentry, name))
+		return 0;
+
+	return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
+				  inode, type);
+}
+
+static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
+{
+	struct hppfs_private *data = file->private_data;
+	struct file *proc_file = data->proc_file;
+	int (*readdir)(struct file *, void *, filldir_t);
+	struct hppfs_dirent dirent = ((struct hppfs_dirent)
+		                      { .vfs_dirent  	= ent,
+					.filldir 	= filldir,
+					.dentry  	= file->f_path.dentry
+				      });
+	int err;
+
+	readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;
+
+	proc_file->f_pos = file->f_pos;
+	err = (*readdir)(proc_file, &dirent, hppfs_filldir);
+	file->f_pos = proc_file->f_pos;
+
+	return err;
+}
+
+static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+	return 0;
+}
+
+static const struct file_operations hppfs_dir_fops = {
+	.owner		= NULL,
+	.readdir	= hppfs_readdir,
+	.open		= hppfs_dir_open,
+	.fsync		= hppfs_fsync,
+};
+
+static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
+{
+	sf->f_blocks = 0;
+	sf->f_bfree = 0;
+	sf->f_bavail = 0;
+	sf->f_files = 0;
+	sf->f_ffree = 0;
+	sf->f_type = HPPFS_SUPER_MAGIC;
+	return 0;
+}
+
+static struct inode *hppfs_alloc_inode(struct super_block *sb)
+{
+	struct hppfs_inode_info *hi;
+
+	hi = kmalloc(sizeof(*hi), GFP_KERNEL);
+	if (!hi)
+		return NULL;
+
+	hi->proc_dentry = NULL;
+	inode_init_once(&hi->vfs_inode);
+	return &hi->vfs_inode;
+}
+
+void hppfs_delete_inode(struct inode *ino)
+{
+	dput(HPPFS_I(ino)->proc_dentry);
+	mntput(ino->i_sb->s_fs_info);
+
+	clear_inode(ino);
+}
+
+static void hppfs_destroy_inode(struct inode *inode)
+{
+	kfree(HPPFS_I(inode));
+}
+
+static const struct super_operations hppfs_sbops = {
+	.alloc_inode	= hppfs_alloc_inode,
+	.destroy_inode	= hppfs_destroy_inode,
+	.delete_inode	= hppfs_delete_inode,
+	.statfs		= hppfs_statfs,
+};
+
+static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
+			  int buflen)
+{
+	struct dentry *proc_dentry;
+
+	proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
+	return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
+						    buflen);
+}
+
+static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	struct dentry *proc_dentry;
+
+	proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
+
+	return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
+}
+
+int hppfs_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+	return generic_permission(inode, mask, NULL);
+}
+
+static const struct inode_operations hppfs_dir_iops = {
+	.lookup		= hppfs_lookup,
+	.permission	= hppfs_permission,
+};
+
+static const struct inode_operations hppfs_link_iops = {
+	.readlink	= hppfs_readlink,
+	.follow_link	= hppfs_follow_link,
+	.permission	= hppfs_permission,
+};
+
+static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
+{
+	struct inode *proc_ino = dentry->d_inode;
+	struct inode *inode = new_inode(sb);
+
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	if (S_ISDIR(dentry->d_inode->i_mode)) {
+		inode->i_op = &hppfs_dir_iops;
+		inode->i_fop = &hppfs_dir_fops;
+	} else if (S_ISLNK(dentry->d_inode->i_mode)) {
+		inode->i_op = &hppfs_link_iops;
+		inode->i_fop = &hppfs_file_fops;
+	} else {
+		inode->i_op = &hppfs_file_iops;
+		inode->i_fop = &hppfs_file_fops;
+	}
+
+	HPPFS_I(inode)->proc_dentry = dget(dentry);
+
+	inode->i_uid = proc_ino->i_uid;
+	inode->i_gid = proc_ino->i_gid;
+	inode->i_atime = proc_ino->i_atime;
+	inode->i_mtime = proc_ino->i_mtime;
+	inode->i_ctime = proc_ino->i_ctime;
+	inode->i_ino = proc_ino->i_ino;
+	inode->i_mode = proc_ino->i_mode;
+	inode->i_nlink = proc_ino->i_nlink;
+	inode->i_size = proc_ino->i_size;
+	inode->i_blocks = proc_ino->i_blocks;
+
+	return inode;
+}
+
+static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
+{
+	struct inode *root_inode;
+	struct vfsmount *proc_mnt;
+	int err = -ENOENT;
+
+	proc_mnt = do_kern_mount("proc", 0, "proc", NULL);
+	if (IS_ERR(proc_mnt))
+		goto out;
+
+	sb->s_blocksize = 1024;
+	sb->s_blocksize_bits = 10;
+	sb->s_magic = HPPFS_SUPER_MAGIC;
+	sb->s_op = &hppfs_sbops;
+	sb->s_fs_info = proc_mnt;
+
+	err = -ENOMEM;
+	root_inode = get_inode(sb, proc_mnt->mnt_sb->s_root);
+	if (!root_inode)
+		goto out_mntput;
+
+	sb->s_root = d_alloc_root(root_inode);
+	if (!sb->s_root)
+		goto out_iput;
+
+	return 0;
+
+ out_iput:
+	iput(root_inode);
+ out_mntput:
+	mntput(proc_mnt);
+ out:
+	return(err);
+}
+
+static int hppfs_read_super(struct file_system_type *type,
+			    int flags, const char *dev_name,
+			    void *data, struct vfsmount *mnt)
+{
+	return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt);
+}
+
+static struct file_system_type hppfs_type = {
+	.owner 		= THIS_MODULE,
+	.name 		= "hppfs",
+	.get_sb 	= hppfs_read_super,
+	.kill_sb	= kill_anon_super,
+	.fs_flags 	= 0,
+};
+
+static int __init init_hppfs(void)
+{
+	return register_filesystem(&hppfs_type);
+}
+
+static void __exit exit_hppfs(void)
+{
+	unregister_filesystem(&hppfs_type);
+}
+
+module_init(init_hppfs)
+module_exit(exit_hppfs)
+MODULE_LICENSE("GPL");

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