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/* * 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 <linux/pid_namespace.h> #include <linux/namei.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, *parent; struct qstr *name = &dentry->d_name; 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); parent = HPPFS_I(ino)->proc_dentry; mutex_lock(&parent->d_inode->i_mutex); proc_dentry = lookup_one_len(name->name, parent, name->len); 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; d_add(dentry, inode); return NULL; 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; } err = hppfs_read_file(hppfs->host_fd, buf, count); if (err < 0) { printk(KERN_ERR "hppfs_read: read failed: %d\n", err); return err; } count = err; 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) { const struct cred *cred = file->f_cred; 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), cred); 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) { 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) { clear_inode(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");
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