---

tarfs_module.c File Reference

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/locks.h>
#include <linux/smp_lock.h>
#include "tarfs_tar.h"
#include "tarfs_common.h"

Go to the source code of this file.

Functions
	MODULE_DESCRIPTION ("TAR FS")
	MODULE_AUTHOR ("Petr Cermak;Jaroslav Drazan")
	MODULE_LICENSE ("GPL")
super_block *	tarfs_read_super (struct super_block *s, void *data, int silent)
	Reads super block of fs.
void	tarfs_read_inode (struct inode *i)
	Reads given inode from device.
int	tarfs_statfs (struct super_block *sb, struct statfs *buf)
	Returns some info on mounted fs.
dentry *	tarfs_lookup (struct inode *dir, struct dentry *dentry)
	Looks up dentry in directory dir.
int	tarfs_readdir (struct file *filp, void *dirent, filldir_t filldir)
int	tarfs_readpage (struct file *file, struct page *page)
	Reads one (or a part of) page from tar.
	DECLARE_FSTYPE_DEV (tarfs_type, FSNAME, tarfs_read_super)
void	tarfs_get_new_root_inode (struct inode *i)
	Fills given inode as root inode.
int __init	init_module ()
	Registers filesystem.
void __exit	cleanup_module ()
	Unregisters filesystem.
Variables
super_operations	tarfs_ops
inode_operations	tarfs_inode_ops
file_operations	tarfs_dir_ops
address_space_operations	tarfs_aops

---

Detailed Description

Contains interface for communicating with VFS

Author:

Jaroslav Drazan <jaroslavdrazan@seznam.cz>

Petr Cermak

Definition in file tarfs_module.c.

---

Function Documentation

void __exit cleanup_module (   )  [static]

Unregisters filesystem. Definition at line 324 of file tarfs_module.c.

DECLARE_FSTYPE_DEV (  tarfs_type  , FSNAME  , tarfs_read_super  )  [static]

int __init init_module (   )  [static]

Registers filesystem. Returns: 0 - OK, < 0 otherwise Definition at line 316 of file tarfs_module.c.

MODULE_AUTHOR (  "Petr Cermak;Jaroslav Drazan"   )

MODULE_DESCRIPTION (  "TAR FS"   )

MODULE_LICENSE (  "GPL"   )

void tarfs_get_new_root_inode (  struct inode *  i  )

Fills given inode as root inode. Called, if there is no root inode present in tar file Parameters: i  Inode structure to be filled Definition at line 187 of file tarfs_module.c. References PRINTD, tarfs_dir_ops, and tarfs_inode_ops. Referenced by tarfs_read_inode().

struct dentry * tarfs_lookup (  struct inode *  dir, struct dentry *  dentry )  [static]

Looks up dentry in directory dir. When found, relevant inode is joined with the dentry by calling d_add function (added to dcache) Parameters: dir  Direstory to perform search in dentry  Directory entry to be searched for Returns: 0 - OK, ERR_PTR(-EACCES) - given entry was not found Definition at line 156 of file tarfs_module.c. References PRINTD, tar_lookup(), TARFS_EVAL, and tarfs_lookup(). Referenced by tarfs_lookup().

void tarfs_read_inode (  struct inode *  i  )  [static]

Reads given inode from device. Parameters: i  Pre-filled inode structure to be read. Definition at line 204 of file tarfs_module.c. References PRINTD, tar_fill_inode(), tarfs_aops, tarfs_dir_ops, tarfs_get_new_root_inode(), tarfs_inode_ops, and TARFS_ROOT_INO.

struct super_block * tarfs_read_super (  struct super_block *  s, void *  data, int  silent )  [static]

Reads super block of fs. Reads super block of tarfs, finds root inode and initializes kernel structures Parameters: s  A partially filled super block structure from kernel data  Mount data passed by mount syscall silent  Bool value, disables / enables error output when mounting fs. Returns: Filled super_block structure Definition at line 84 of file tarfs_module.c. References PRINTD, tar_get_root_ino(), tar_quick_validation(), TARFS_BLKSIZE, TARFS_BLKSIZE_BITS, TARFS_EVAL, TARFS_MAGIC, tarfs_ops, and tarfs_read_super(). Referenced by tarfs_read_super().

int tarfs_readdir (  struct file *  filp, void *  dirent, filldir_t  filldir )  [static]

Definition at line 129 of file tarfs_module.c. References PRINTD, tar_readdir(), and TARFS_EVAL.

int tarfs_readpage (  struct file *  file, struct page *  page )  [static]

Reads one (or a part of) page from tar. This function is called when reading from file, mapping into memory, reading symlinks etc. Parameters: file  File from which to map desired page. We don't need/use it. page  Structure describing page to be read. Contains relevant inode in page->mapping->host. Returns: 0 - OK, -EIO - error reading page Definition at line 255 of file tarfs_module.c. References PRINTD, tar_read_page(), and TARFS_EVAL.

int tarfs_statfs (  struct super_block *  s, struct statfs *  stats )  [static]

Returns some info on mounted fs. Parameters: s  Super block structure. stats  Structure to fill fs info into. Returns: 0 - Success Definition at line 298 of file tarfs_module.c. References PRINTD, tar_length(), TARFS_BLKSIZE, and TARFS_MAGIC.

---

Variable Documentation

struct address_space_operations tarfs_aops [static]

Initial value: { readpage: tarfs_readpage, } Definition at line 66 of file tarfs_module.c. Referenced by tarfs_read_inode().

struct file_operations tarfs_dir_ops [static]

Initial value: { read: generic_read_dir, readdir: tarfs_readdir, } Definition at line 60 of file tarfs_module.c. Referenced by tarfs_get_new_root_inode(), and tarfs_read_inode().

struct inode_operations tarfs_inode_ops [static]

Initial value: { lookup: tarfs_lookup, } Definition at line 54 of file tarfs_module.c. Referenced by tarfs_get_new_root_inode(), and tarfs_read_inode().

struct super_operations tarfs_ops [static]

Initial value: { read_inode: tarfs_read_inode, statfs: tarfs_statfs, } Definition at line 48 of file tarfs_module.c. Referenced by tarfs_read_super().

---