769 lines
17 KiB
C
769 lines
17 KiB
C
/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <linux/ctype.h>
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#include <linux/dcache.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/slab.h>
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#include <linux/statfs.h>
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#include <linux/types.h>
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#include <linux/pid_namespace.h>
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#include <linux/namei.h>
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#include <asm/uaccess.h>
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#include "os.h"
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static struct inode *get_inode(struct super_block *, struct dentry *);
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struct hppfs_data {
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struct list_head list;
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char contents[PAGE_SIZE - sizeof(struct list_head)];
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};
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struct hppfs_private {
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struct file *proc_file;
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int host_fd;
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loff_t len;
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struct hppfs_data *contents;
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};
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struct hppfs_inode_info {
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struct dentry *proc_dentry;
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struct inode vfs_inode;
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};
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static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
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{
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return container_of(inode, struct hppfs_inode_info, vfs_inode);
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}
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#define HPPFS_SUPER_MAGIC 0xb00000ee
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static const struct super_operations hppfs_sbops;
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static int is_pid(struct dentry *dentry)
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{
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struct super_block *sb;
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int i;
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sb = dentry->d_sb;
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if (dentry->d_parent != sb->s_root)
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return 0;
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for (i = 0; i < dentry->d_name.len; i++) {
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if (!isdigit(dentry->d_name.name[i]))
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return 0;
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}
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return 1;
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}
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static char *dentry_name(struct dentry *dentry, int extra)
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{
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struct dentry *parent;
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char *root, *name;
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const char *seg_name;
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int len, seg_len;
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len = 0;
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parent = dentry;
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while (parent->d_parent != parent) {
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if (is_pid(parent))
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len += strlen("pid") + 1;
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else len += parent->d_name.len + 1;
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parent = parent->d_parent;
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}
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root = "proc";
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len += strlen(root);
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name = kmalloc(len + extra + 1, GFP_KERNEL);
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if (name == NULL)
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return NULL;
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name[len] = '\0';
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parent = dentry;
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while (parent->d_parent != parent) {
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if (is_pid(parent)) {
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seg_name = "pid";
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seg_len = strlen("pid");
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}
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else {
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seg_name = parent->d_name.name;
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seg_len = parent->d_name.len;
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}
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len -= seg_len + 1;
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name[len] = '/';
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strncpy(&name[len + 1], seg_name, seg_len);
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parent = parent->d_parent;
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}
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strncpy(name, root, strlen(root));
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return name;
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}
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static int file_removed(struct dentry *dentry, const char *file)
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{
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char *host_file;
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int extra, fd;
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extra = 0;
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if (file != NULL)
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extra += strlen(file) + 1;
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host_file = dentry_name(dentry, extra + strlen("/remove"));
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if (host_file == NULL) {
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printk(KERN_ERR "file_removed : allocation failed\n");
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return -ENOMEM;
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}
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if (file != NULL) {
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strcat(host_file, "/");
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strcat(host_file, file);
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}
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strcat(host_file, "/remove");
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fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
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kfree(host_file);
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if (fd > 0) {
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os_close_file(fd);
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return 1;
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}
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return 0;
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}
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static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
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struct nameidata *nd)
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{
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struct dentry *proc_dentry, *parent;
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struct qstr *name = &dentry->d_name;
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struct inode *inode;
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int err, deleted;
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deleted = file_removed(dentry, NULL);
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if (deleted < 0)
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return ERR_PTR(deleted);
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else if (deleted)
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return ERR_PTR(-ENOENT);
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parent = HPPFS_I(ino)->proc_dentry;
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mutex_lock(&parent->d_inode->i_mutex);
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proc_dentry = lookup_one_len(name->name, parent, name->len);
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mutex_unlock(&parent->d_inode->i_mutex);
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if (IS_ERR(proc_dentry))
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return proc_dentry;
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err = -ENOMEM;
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inode = get_inode(ino->i_sb, proc_dentry);
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if (!inode)
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goto out;
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d_add(dentry, inode);
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return NULL;
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out:
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return ERR_PTR(err);
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}
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static const struct inode_operations hppfs_file_iops = {
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};
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static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
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loff_t *ppos, int is_user)
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{
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ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
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ssize_t n;
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read = file->f_path.dentry->d_inode->i_fop->read;
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if (!is_user)
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set_fs(KERNEL_DS);
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n = (*read)(file, buf, count, &file->f_pos);
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if (!is_user)
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set_fs(USER_DS);
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if (ppos)
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*ppos = file->f_pos;
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return n;
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}
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static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
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{
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ssize_t n;
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int cur, err;
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char *new_buf;
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n = -ENOMEM;
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new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (new_buf == NULL) {
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printk(KERN_ERR "hppfs_read_file : kmalloc failed\n");
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goto out;
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}
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n = 0;
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while (count > 0) {
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cur = min_t(ssize_t, count, PAGE_SIZE);
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err = os_read_file(fd, new_buf, cur);
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if (err < 0) {
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printk(KERN_ERR "hppfs_read : read failed, "
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"errno = %d\n", err);
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n = err;
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goto out_free;
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} else if (err == 0)
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break;
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if (copy_to_user(buf, new_buf, err)) {
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n = -EFAULT;
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goto out_free;
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}
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n += err;
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count -= err;
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}
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out_free:
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kfree(new_buf);
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out:
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return n;
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}
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static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct hppfs_private *hppfs = file->private_data;
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struct hppfs_data *data;
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loff_t off;
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int err;
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if (hppfs->contents != NULL) {
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int rem;
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if (*ppos >= hppfs->len)
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return 0;
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data = hppfs->contents;
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off = *ppos;
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while (off >= sizeof(data->contents)) {
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data = list_entry(data->list.next, struct hppfs_data,
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list);
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off -= sizeof(data->contents);
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}
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if (off + count > hppfs->len)
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count = hppfs->len - off;
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rem = copy_to_user(buf, &data->contents[off], count);
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*ppos += count - rem;
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if (rem > 0)
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return -EFAULT;
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} else if (hppfs->host_fd != -1) {
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err = os_seek_file(hppfs->host_fd, *ppos);
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if (err) {
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printk(KERN_ERR "hppfs_read : seek failed, "
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"errno = %d\n", err);
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return err;
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}
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err = hppfs_read_file(hppfs->host_fd, buf, count);
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if (err < 0) {
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printk(KERN_ERR "hppfs_read: read failed: %d\n", err);
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return err;
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}
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count = err;
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if (count > 0)
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*ppos += count;
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}
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else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
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return count;
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}
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static ssize_t hppfs_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
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{
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struct hppfs_private *data = file->private_data;
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struct file *proc_file = data->proc_file;
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ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
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write = proc_file->f_path.dentry->d_inode->i_fop->write;
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return (*write)(proc_file, buf, len, ppos);
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}
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static int open_host_sock(char *host_file, int *filter_out)
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{
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char *end;
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int fd;
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end = &host_file[strlen(host_file)];
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strcpy(end, "/rw");
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*filter_out = 1;
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fd = os_connect_socket(host_file);
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if (fd > 0)
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return fd;
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strcpy(end, "/r");
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*filter_out = 0;
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fd = os_connect_socket(host_file);
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return fd;
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}
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static void free_contents(struct hppfs_data *head)
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{
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struct hppfs_data *data;
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struct list_head *ele, *next;
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if (head == NULL)
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return;
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list_for_each_safe(ele, next, &head->list) {
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data = list_entry(ele, struct hppfs_data, list);
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kfree(data);
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}
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kfree(head);
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}
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static struct hppfs_data *hppfs_get_data(int fd, int filter,
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struct file *proc_file,
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struct file *hppfs_file,
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loff_t *size_out)
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{
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struct hppfs_data *data, *new, *head;
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int n, err;
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err = -ENOMEM;
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data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL) {
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printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
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goto failed;
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}
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INIT_LIST_HEAD(&data->list);
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head = data;
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*size_out = 0;
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if (filter) {
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while ((n = read_proc(proc_file, data->contents,
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sizeof(data->contents), NULL, 0)) > 0)
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os_write_file(fd, data->contents, n);
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err = os_shutdown_socket(fd, 0, 1);
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if (err) {
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printk(KERN_ERR "hppfs_get_data : failed to shut down "
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"socket\n");
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goto failed_free;
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}
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}
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while (1) {
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n = os_read_file(fd, data->contents, sizeof(data->contents));
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if (n < 0) {
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err = n;
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printk(KERN_ERR "hppfs_get_data : read failed, "
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"errno = %d\n", err);
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goto failed_free;
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} else if (n == 0)
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break;
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*size_out += n;
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if (n < sizeof(data->contents))
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break;
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new = kmalloc(sizeof(*data), GFP_KERNEL);
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if (new == 0) {
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printk(KERN_ERR "hppfs_get_data : data allocation "
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"failed\n");
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err = -ENOMEM;
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goto failed_free;
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}
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INIT_LIST_HEAD(&new->list);
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list_add(&new->list, &data->list);
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data = new;
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}
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return head;
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failed_free:
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free_contents(head);
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failed:
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return ERR_PTR(err);
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}
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static struct hppfs_private *hppfs_data(void)
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{
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struct hppfs_private *data;
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data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return data;
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*data = ((struct hppfs_private ) { .host_fd = -1,
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.len = -1,
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.contents = NULL } );
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return data;
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}
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|
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static int file_mode(int fmode)
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{
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if (fmode == (FMODE_READ | FMODE_WRITE))
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return O_RDWR;
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if (fmode == FMODE_READ)
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return O_RDONLY;
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if (fmode == FMODE_WRITE)
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return O_WRONLY;
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return 0;
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}
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|
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static int hppfs_open(struct inode *inode, struct file *file)
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{
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const struct cred *cred = file->f_cred;
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struct hppfs_private *data;
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struct vfsmount *proc_mnt;
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struct dentry *proc_dentry;
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char *host_file;
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int err, fd, type, filter;
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err = -ENOMEM;
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data = hppfs_data();
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if (data == NULL)
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goto out;
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host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
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if (host_file == NULL)
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goto out_free2;
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proc_dentry = HPPFS_I(inode)->proc_dentry;
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proc_mnt = inode->i_sb->s_fs_info;
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/* XXX This isn't closed anywhere */
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data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
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file_mode(file->f_mode), cred);
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err = PTR_ERR(data->proc_file);
|
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if (IS_ERR(data->proc_file))
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goto out_free1;
|
|
|
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type = os_file_type(host_file);
|
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if (type == OS_TYPE_FILE) {
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fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
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if (fd >= 0)
|
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data->host_fd = fd;
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else
|
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printk(KERN_ERR "hppfs_open : failed to open '%s', "
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"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,
|
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data->proc_file,
|
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file, &data->len);
|
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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)
|
|
{
|
|
const struct cred *cred = file->f_cred;
|
|
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), cred);
|
|
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, loff_t start, loff_t end,
|
|
int datasync)
|
|
{
|
|
return filemap_write_and_wait_range(file->f_mapping, start, end);
|
|
}
|
|
|
|
static const struct file_operations hppfs_dir_fops = {
|
|
.owner = NULL,
|
|
.readdir = hppfs_readdir,
|
|
.open = hppfs_dir_open,
|
|
.fsync = hppfs_fsync,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
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_evict_inode(struct inode *ino)
|
|
{
|
|
end_writeback(ino);
|
|
dput(HPPFS_I(ino)->proc_dentry);
|
|
mntput(ino->i_sb->s_fs_info);
|
|
}
|
|
|
|
static void hppfs_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
kfree(HPPFS_I(inode));
|
|
}
|
|
|
|
static void hppfs_destroy_inode(struct inode *inode)
|
|
{
|
|
call_rcu(&inode->i_rcu, hppfs_i_callback);
|
|
}
|
|
|
|
static const struct super_operations hppfs_sbops = {
|
|
.alloc_inode = hppfs_alloc_inode,
|
|
.destroy_inode = hppfs_destroy_inode,
|
|
.evict_inode = hppfs_evict_inode,
|
|
.statfs = hppfs_statfs,
|
|
};
|
|
|
|
static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
|
|
int buflen)
|
|
{
|
|
struct 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 = HPPFS_I(dentry->d_inode)->proc_dentry;
|
|
|
|
return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
|
|
}
|
|
|
|
static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
|
|
void *cookie)
|
|
{
|
|
struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
|
|
|
|
if (proc_dentry->d_inode->i_op->put_link)
|
|
proc_dentry->d_inode->i_op->put_link(proc_dentry, nd, cookie);
|
|
}
|
|
|
|
static const struct inode_operations hppfs_dir_iops = {
|
|
.lookup = hppfs_lookup,
|
|
};
|
|
|
|
static const struct inode_operations hppfs_link_iops = {
|
|
.readlink = hppfs_readlink,
|
|
.follow_link = hppfs_follow_link,
|
|
.put_link = hppfs_put_link,
|
|
};
|
|
|
|
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) {
|
|
dput(dentry);
|
|
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 = 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;
|
|
set_nlink(inode, 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 = mntget(current->nsproxy->pid_ns->proc_mnt);
|
|
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, dget(proc_mnt->mnt_root));
|
|
sb->s_root = d_make_root(root_inode);
|
|
if (!sb->s_root)
|
|
goto out_mntput;
|
|
|
|
return 0;
|
|
|
|
out_mntput:
|
|
mntput(proc_mnt);
|
|
out:
|
|
return(err);
|
|
}
|
|
|
|
static struct dentry *hppfs_read_super(struct file_system_type *type,
|
|
int flags, const char *dev_name,
|
|
void *data)
|
|
{
|
|
return mount_nodev(type, flags, data, hppfs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type hppfs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "hppfs",
|
|
.mount = 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");
|