diff options
Diffstat (limited to 'fs/hppfs/hppfs_kern.c')
| -rw-r--r-- | fs/hppfs/hppfs_kern.c | 810 |
1 files changed, 0 insertions, 810 deletions
diff --git a/fs/hppfs/hppfs_kern.c b/fs/hppfs/hppfs_kern.c deleted file mode 100644 index 52930915bad..00000000000 --- a/fs/hppfs/hppfs_kern.c +++ /dev/null @@ -1,810 +0,0 @@ -/* - * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) - * Licensed under the GPL - */ - -#include <linux/fs.h> -#include <linux/file.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/list.h> -#include <linux/kernel.h> -#include <linux/ctype.h> -#include <linux/dcache.h> -#include <linux/statfs.h> -#include <asm/uaccess.h> -#include <asm/fcntl.h> -#include "os.h" - -static int init_inode(struct inode *inode, struct dentry *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 struct super_operations hppfs_sbops; - -static int is_pid(struct dentry *dentry) -{ - struct super_block *sb; - int i; - - sb = dentry->d_sb; - if((sb->s_op != &hppfs_sbops) || (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); -} - -struct dentry_operations hppfs_dentry_ops = { -}; - -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("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 void hppfs_read_inode(struct inode *ino) -{ - struct inode *proc_ino; - - if(HPPFS_I(ino)->proc_dentry == NULL) - return; - - proc_ino = HPPFS_I(ino)->proc_dentry->d_inode; - ino->i_uid = proc_ino->i_uid; - ino->i_gid = proc_ino->i_gid; - ino->i_atime = proc_ino->i_atime; - ino->i_mtime = proc_ino->i_mtime; - ino->i_ctime = proc_ino->i_ctime; - ino->i_ino = proc_ino->i_ino; - ino->i_mode = proc_ino->i_mode; - ino->i_nlink = proc_ino->i_nlink; - ino->i_size = proc_ino->i_size; - ino->i_blksize = proc_ino->i_blksize; - ino->i_blocks = proc_ino->i_blocks; -} - -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; - down(&parent->d_inode->i_sem); - proc_dentry = d_lookup(parent, &dentry->d_name); - if(proc_dentry == NULL){ - proc_dentry = d_alloc(parent, &dentry->d_name); - if(proc_dentry == NULL){ - up(&parent->d_inode->i_sem); - goto out; - } - new = (*parent->d_inode->i_op->lookup)(parent->d_inode, - proc_dentry, NULL); - if(new){ - dput(proc_dentry); - proc_dentry = new; - } - } - up(&parent->d_inode->i_sem); - - if(IS_ERR(proc_dentry)) - return(proc_dentry); - - inode = iget(ino->i_sb, 0); - if(inode == NULL) - goto out_dput; - - err = init_inode(inode, proc_dentry); - if(err) - goto out_put; - - hppfs_read_inode(inode); - - d_add(dentry, inode); - dentry->d_op = &hppfs_dentry_ops; - return(NULL); - - out_put: - iput(inode); - out_dput: - dput(proc_dentry); - out: - return(ERR_PTR(err)); -} - -static struct inode_operations hppfs_file_iops = { -}; - -static ssize_t read_proc(struct file *file, char *buf, ssize_t count, - loff_t *ppos, int is_user) -{ - ssize_t (*read)(struct file *, char *, size_t, loff_t *); - ssize_t n; - - read = file->f_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 *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("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("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 *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){ - 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; - copy_to_user(buf, &data->contents[off], count); - *ppos += count; - } - else if(hppfs->host_fd != -1){ - err = os_seek_file(hppfs->host_fd, *ppos); - if(err){ - printk("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 *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 *, size_t, loff_t *); - int err; - - write = proc_file->f_dentry->d_inode->i_fop->write; - - proc_file->f_pos = file->f_pos; - err = (*write)(proc_file, buf, len, &proc_file->f_pos); - file->f_pos = proc_file->f_pos; - - return(err); -} - -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("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("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("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("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 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_dentry, strlen("/rw")); - if(host_file == NULL) - goto out_free2; - - proc_dentry = HPPFS_I(inode)->proc_dentry; - - /* XXX This isn't closed anywhere */ - data->proc_file = dentry_open(dget(proc_dentry), NULL, - 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("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("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 dentry *proc_dentry; - int err; - - err = -ENOMEM; - data = hppfs_data(); - if(data == NULL) - goto out; - - proc_dentry = HPPFS_I(inode)->proc_dentry; - data->proc_file = dentry_open(dget(proc_dentry), NULL, - 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_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 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, ino_t 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_dentry } ); - int err; - - readdir = proc_file->f_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 struct file_operations hppfs_dir_fops = { - .owner = NULL, - .readdir = hppfs_readdir, - .open = hppfs_dir_open, - .fsync = hppfs_fsync, -}; - -static int hppfs_statfs(struct super_block *sb, 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 == NULL) - return(NULL); - - *hi = ((struct hppfs_inode_info) { .proc_dentry = NULL }); - inode_init_once(&hi->vfs_inode); - return(&hi->vfs_inode); -} - -void hppfs_delete_inode(struct inode *ino) -{ - clear_inode(ino); -} - -static void hppfs_destroy_inode(struct inode *inode) -{ - kfree(HPPFS_I(inode)); -} - -static struct super_operations hppfs_sbops = { - .alloc_inode = hppfs_alloc_inode, - .destroy_inode = hppfs_destroy_inode, - .read_inode = hppfs_read_inode, - .delete_inode = hppfs_delete_inode, - .statfs = hppfs_statfs, -}; - -static int hppfs_readlink(struct dentry *dentry, char *buffer, int buflen) -{ - struct file *proc_file; - struct dentry *proc_dentry; - int ret; - - proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; - proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY); - if (IS_ERR(proc_file)) - return PTR_ERR(proc_file); - - ret = proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, buflen); - - fput(proc_file); - - return ret; -} - -static void* hppfs_follow_link(struct dentry *dentry, struct nameidata *nd) -{ - struct file *proc_file; - struct dentry *proc_dentry; - void *ret; - - proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; - proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY); - if (IS_ERR(proc_file)) - return proc_file; - - ret = proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd); - - fput(proc_file); - - return ret; -} - -static struct inode_operations hppfs_dir_iops = { - .lookup = hppfs_lookup, -}; - -static struct inode_operations hppfs_link_iops = { - .readlink = hppfs_readlink, - .follow_link = hppfs_follow_link, -}; - -static int init_inode(struct inode *inode, struct dentry *dentry) -{ - 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; - - return(0); -} - -static int hppfs_fill_super(struct super_block *sb, void *d, int silent) -{ - struct inode *root_inode; - struct file_system_type *procfs; - struct super_block *proc_sb; - int err; - - err = -ENOENT; - procfs = get_fs_type("proc"); - if(procfs == NULL) - goto out; - - if(list_empty(&procfs->fs_supers)) - goto out; - - proc_sb = list_entry(procfs->fs_supers.next, struct super_block, - s_instances); - - sb->s_blocksize = 1024; - sb->s_blocksize_bits = 10; - sb->s_magic = HPPFS_SUPER_MAGIC; - sb->s_op = &hppfs_sbops; - - root_inode = iget(sb, 0); - if(root_inode == NULL) - goto out; - - err = init_inode(root_inode, proc_sb->s_root); - if(err) - goto out_put; - - err = -ENOMEM; - sb->s_root = d_alloc_root(root_inode); - if(sb->s_root == NULL) - goto out_put; - - hppfs_read_inode(root_inode); - - return(0); - - out_put: - iput(root_inode); - out: - return(err); -} - -static struct super_block *hppfs_read_super(struct file_system_type *type, - int flags, const char *dev_name, - void *data) -{ - return(get_sb_nodev(type, flags, data, hppfs_fill_super)); -} - -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"); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ |