libfs.c File Reference

#include <linux/export.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/mount.h>
#include <linux/vfs.h>
#include <linux/quotaops.h>
#include <linux/mutex.h>
#include <linux/exportfs.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <asm/uaccess.h>
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	simple_attr

Functions
int	simple_getattr (struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
int	simple_statfs (struct dentry *dentry, struct kstatfs *buf)
struct dentry *	simple_lookup (struct inode *dir, struct dentry *dentry, unsigned int flags)
int	dcache_dir_open (struct inode *inode, struct file *file)
int	dcache_dir_close (struct inode *inode, struct file *file)
loff_t	dcache_dir_lseek (struct file *file, loff_t offset, int origin)
int	dcache_readdir (struct file *filp, void *dirent, filldir_t filldir)
ssize_t	generic_read_dir (struct file *filp, char __user *buf, size_t siz, loff_t *ppos)
struct dentry *	mount_pseudo (struct file_system_type *fs_type, char *name, const struct super_operations *ops, const struct dentry_operations *dops, unsigned long magic)
int	simple_open (struct inode *inode, struct file *file)
int	simple_link (struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
int	simple_empty (struct dentry *dentry)
int	simple_unlink (struct inode *dir, struct dentry *dentry)
int	simple_rmdir (struct inode *dir, struct dentry *dentry)
int	simple_rename (struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry)
int	simple_setattr (struct dentry *dentry, struct iattr *iattr)
	EXPORT_SYMBOL (simple_setattr)
int	simple_readpage (struct file *file, struct page *page)
int	simple_write_begin (struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata)
int	simple_write_end (struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
int	simple_fill_super (struct super_block *s, unsigned long magic, struct tree_descr *files)
int	simple_pin_fs (struct file_system_type *type, struct vfsmount **mount, int *count)
void	simple_release_fs (struct vfsmount **mount, int *count)
ssize_t	simple_read_from_buffer (void __user *to, size_t count, loff_t *ppos, const void *from, size_t available)
ssize_t	simple_write_to_buffer (void *to, size_t available, loff_t *ppos, const void __user *from, size_t count)
ssize_t	memory_read_from_buffer (void *to, size_t count, loff_t *ppos, const void *from, size_t available)
void	simple_transaction_set (struct file *file, size_t n)
char *	simple_transaction_get (struct file *file, const char __user *buf, size_t size)
ssize_t	simple_transaction_read (struct file *file, char __user *buf, size_t size, loff_t *pos)
int	simple_transaction_release (struct inode *inode, struct file *file)
int	simple_attr_open (struct inode *inode, struct file *file, int(*get)(void *, u64 *), int(*set)(void *, u64), const char *fmt)
int	simple_attr_release (struct inode *inode, struct file *file)
ssize_t	simple_attr_read (struct file *file, char __user *buf, size_t len, loff_t *ppos)
ssize_t	simple_attr_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
struct dentry *	generic_fh_to_dentry (struct super_block *sb, struct fid *fid, int fh_len, int fh_type, struct inode *(*get_inode)(struct super_block *sb, u64 ino, u32 gen))
	EXPORT_SYMBOL_GPL (generic_fh_to_dentry)
struct dentry *	generic_fh_to_parent (struct super_block *sb, struct fid *fid, int fh_len, int fh_type, struct inode *(*get_inode)(struct super_block *sb, u64 ino, u32 gen))
	EXPORT_SYMBOL_GPL (generic_fh_to_parent)
int	generic_file_fsync (struct file *file, loff_t start, loff_t end, int datasync)
	EXPORT_SYMBOL (generic_file_fsync)
int	generic_check_addressable (unsigned blocksize_bits, u64 num_blocks)
	EXPORT_SYMBOL (generic_check_addressable)
int	noop_fsync (struct file *file, loff_t start, loff_t end, int datasync)
	EXPORT_SYMBOL (dcache_dir_close)
	EXPORT_SYMBOL (dcache_dir_lseek)
	EXPORT_SYMBOL (dcache_dir_open)
	EXPORT_SYMBOL (dcache_readdir)
	EXPORT_SYMBOL (generic_read_dir)
	EXPORT_SYMBOL (mount_pseudo)
	EXPORT_SYMBOL (simple_write_begin)
	EXPORT_SYMBOL (simple_write_end)
	EXPORT_SYMBOL (simple_dir_inode_operations)
	EXPORT_SYMBOL (simple_dir_operations)
	EXPORT_SYMBOL (simple_empty)
	EXPORT_SYMBOL (simple_fill_super)
	EXPORT_SYMBOL (simple_getattr)
	EXPORT_SYMBOL (simple_open)
	EXPORT_SYMBOL (simple_link)
	EXPORT_SYMBOL (simple_lookup)
	EXPORT_SYMBOL (simple_pin_fs)
	EXPORT_SYMBOL (simple_readpage)
	EXPORT_SYMBOL (simple_release_fs)
	EXPORT_SYMBOL (simple_rename)
	EXPORT_SYMBOL (simple_rmdir)
	EXPORT_SYMBOL (simple_statfs)
	EXPORT_SYMBOL (noop_fsync)
	EXPORT_SYMBOL (simple_unlink)
	EXPORT_SYMBOL (simple_read_from_buffer)
	EXPORT_SYMBOL (simple_write_to_buffer)
	EXPORT_SYMBOL (memory_read_from_buffer)
	EXPORT_SYMBOL (simple_transaction_set)
	EXPORT_SYMBOL (simple_transaction_get)
	EXPORT_SYMBOL (simple_transaction_read)
	EXPORT_SYMBOL (simple_transaction_release)
	EXPORT_SYMBOL_GPL (simple_attr_open)
	EXPORT_SYMBOL_GPL (simple_attr_release)
	EXPORT_SYMBOL_GPL (simple_attr_read)
	EXPORT_SYMBOL_GPL (simple_attr_write)

Variables
struct file_operations	simple_dir_operations
struct inode_operations	simple_dir_inode_operations

Detailed Description

simple_write_end - .write_end helper for non-block-device FSes : See .write_end of address_space_operations

: " @pos: " : " @copied: "

Definition in file libfs.c.

Function Documentation

int dcache_dir_close	(	struct inode *	inode,
		struct file *	file
	)

Definition at line 78 of file libfs.c.

loff_t dcache_dir_lseek	(	struct file *	file,
		loff_t	offset,
		int	origin
	)

Definition at line 84 of file libfs.c.

int dcache_dir_open	(	struct inode *	inode,
		struct file *	file
	)

Definition at line 69 of file libfs.c.

int dcache_readdir	(	struct file *	filp,
		void *	dirent,
		filldir_t	filldir
	)

Definition at line 138 of file libfs.c.

EXPORT_SYMBOL

(

simple_setattr

)

EXPORT_SYMBOL

(

generic_file_fsync

)

EXPORT_SYMBOL

(

generic_check_addressable

)

EXPORT_SYMBOL

(

dcache_dir_close

)

EXPORT_SYMBOL

(

dcache_dir_lseek

)

EXPORT_SYMBOL

(

dcache_dir_open

)

EXPORT_SYMBOL

(

dcache_readdir

)

EXPORT_SYMBOL

(

generic_read_dir

)

EXPORT_SYMBOL

(

mount_pseudo

)

EXPORT_SYMBOL

(

simple_write_begin

)

EXPORT_SYMBOL

(

simple_write_end

)

EXPORT_SYMBOL

(

simple_dir_inode_operations

)

EXPORT_SYMBOL

(

simple_dir_operations

)

EXPORT_SYMBOL

(

simple_empty

)

EXPORT_SYMBOL

(

simple_fill_super

)

EXPORT_SYMBOL

(

simple_getattr

)

EXPORT_SYMBOL

(

simple_open

)

EXPORT_SYMBOL

(

simple_link

)

EXPORT_SYMBOL

(

simple_lookup

)

EXPORT_SYMBOL

(

simple_pin_fs

)

EXPORT_SYMBOL

(

simple_readpage

)

EXPORT_SYMBOL

(

simple_release_fs

)

EXPORT_SYMBOL

(

simple_rename

)

EXPORT_SYMBOL

(

simple_rmdir

)

EXPORT_SYMBOL

(

simple_statfs

)

EXPORT_SYMBOL

(

noop_fsync

)

EXPORT_SYMBOL

(

simple_unlink

)

EXPORT_SYMBOL

(

simple_read_from_buffer

)

EXPORT_SYMBOL

(

simple_write_to_buffer

)

EXPORT_SYMBOL

(

memory_read_from_buffer

)

EXPORT_SYMBOL

(

simple_transaction_set

)

EXPORT_SYMBOL

(

simple_transaction_get

)

EXPORT_SYMBOL

(

simple_transaction_read

)

EXPORT_SYMBOL

(

simple_transaction_release

)

EXPORT_SYMBOL_GPL

(

generic_fh_to_dentry

)

EXPORT_SYMBOL_GPL

(

generic_fh_to_parent

)

EXPORT_SYMBOL_GPL

(

simple_attr_open

)

EXPORT_SYMBOL_GPL

(

simple_attr_release

)

EXPORT_SYMBOL_GPL

(

simple_attr_read

)

EXPORT_SYMBOL_GPL

(

simple_attr_write

)

int generic_check_addressable	(	unsigned	blocksize_bits,
		u64	num_blocks
	)

generic_check_addressable - Check addressability of file system : log of file system block size : number of blocks in file system

Determine whether a file system with blocks (and a block size of 2**) is addressable by the sector_t and page cache of the system. Return 0 if so and -EFBIG otherwise.

Definition at line 954 of file libfs.c.

struct dentry* generic_fh_to_dentry ( struct super_block *  sb, struct fid *  fid, int  fh_len, int  fh_type, struct inode *(*)(struct super_block *sb, u64 ino, u32 gen)  get_inode  )

read

generic_fh_to_dentry - generic helper for the fh_to_dentry export operation : filesystem to do the file handle conversion on : file handle to convert : length of the file handle in bytes : type of file handle : filesystem callback to retrieve inode

This function decodes as long as it has one of the well-known Linux filehandle types and calls on it to retrieve the inode for the object specified in the file handle.

Definition at line 856 of file libfs.c.

struct dentry* generic_fh_to_parent ( struct super_block *  sb, struct fid *  fid, int  fh_len, int  fh_type, struct inode *(*)(struct super_block *sb, u64 ino, u32 gen)  get_inode  )

read

generic_fh_to_parent - generic helper for the fh_to_parent export operation : filesystem to do the file handle conversion on : file handle to convert : length of the file handle in bytes : type of file handle : filesystem callback to retrieve inode

This function decodes as long as it has one of the well-known Linux filehandle types and calls on it to retrieve the inode for the parent object specified in the file handle if it is specified in the file handle, or NULL otherwise.

Definition at line 889 of file libfs.c.

int generic_file_fsync	(	struct file *	file,
		loff_t	start,
		loff_t	end,
		int	datasync
	)

Definition at line 918 of file libfs.c.

ssize_t generic_read_dir	(	struct file *	filp,
		char __user *	buf,
		size_t	siz,
		loff_t *	ppos
	)

Definition at line 195 of file libfs.c.

ssize_t memory_read_from_buffer	(	void *	to,
		size_t	count,
		loff_t *	ppos,
		const void *	from,
		size_t	available
	)

memory_read_from_buffer - copy data from the buffer : the kernel space buffer to read to : the maximum number of bytes to read : the current position in the buffer : the buffer to read from : the size of the buffer

The memory_read_from_buffer() function reads up to bytes from the buffer at offset into the kernel space address starting at .

On success, the number of bytes read is returned and the offset is advanced by this number, or negative value is returned on error.

Definition at line 652 of file libfs.c.

struct dentry* mount_pseudo ( struct file_system_type *  fs_type, char *  name, const struct super_operations *  ops, const struct dentry_operations *  dops, unsigned long  magic  )

read

Definition at line 221 of file libfs.c.

int noop_fsync	(	struct file *	file,
		loff_t	start,
		loff_t	end,
		int	datasync
	)

Definition at line 977 of file libfs.c.

int simple_attr_open	(	struct inode *	inode,
		struct file *	file,
		int(*)(void *, u64 *)	get,
		int(*)(void *, u64)	set,
		const char *	fmt
	)

Definition at line 750 of file libfs.c.

ssize_t simple_attr_read	(	struct file *	file,
		char __user *	buf,
		size_t	len,
		loff_t *	ppos
	)

Definition at line 778 of file libfs.c.

int simple_attr_release	(	struct inode *	inode,
		struct file *	file
	)

Definition at line 771 of file libfs.c.

ssize_t simple_attr_write	(	struct file *	file,
		const char __user *	buf,
		size_t	len,
		loff_t *	ppos
	)

Definition at line 813 of file libfs.c.

int simple_empty

(

struct dentry *

dentry

)

Definition at line 286 of file libfs.c.

int simple_fill_super	(	struct super_block *	s,
		unsigned long	magic,
		struct tree_descr *	files
	)

Definition at line 474 of file libfs.c.

int simple_getattr	(	struct vfsmount *	mnt,
		struct dentry *	dentry,
		struct kstat *	stat
	)

Definition at line 26 of file libfs.c.

int simple_link	(	struct dentry *	old_dentry,
		struct inode *	dir,
		struct dentry *	dentry
	)

Definition at line 274 of file libfs.c.

struct dentry* simple_lookup ( struct inode *  dir, struct dentry *  dentry, unsigned int  flags  )

read

Definition at line 56 of file libfs.c.

int simple_open	(	struct inode *	inode,
		struct file *	file
	)

Definition at line 267 of file libfs.c.

int simple_pin_fs	(	struct file_system_type *	type,
		struct vfsmount **	mount,
		int *	count
	)

Definition at line 539 of file libfs.c.

ssize_t simple_read_from_buffer	(	void __user *	to,
		size_t	count,
		loff_t *	ppos,
		const void *	from,
		size_t	available
	)

simple_read_from_buffer - copy data from the buffer to user space : the user space buffer to read to : the maximum number of bytes to read : the current position in the buffer : the buffer to read from : the size of the buffer

The simple_read_from_buffer() function reads up to bytes from the buffer at offset into the user space address starting at .

On success, the number of bytes read is returned and the offset is advanced by this number, or negative value is returned on error.

Definition at line 584 of file libfs.c.

int simple_readpage	(	struct file *	file,
		struct page *	page
	)

Definition at line 386 of file libfs.c.

void simple_release_fs	(	struct vfsmount **	mount,
		int *	count
	)

Definition at line 559 of file libfs.c.

int simple_rename	(	struct inode *	old_dir,
		struct dentry *	old_dentry,
		struct inode *	new_dir,
		struct dentry *	new_dentry
	)

Definition at line 327 of file libfs.c.

int simple_rmdir	(	struct inode *	dir,
		struct dentry *	dentry
	)

Definition at line 316 of file libfs.c.

int simple_setattr	(	struct dentry *	dentry,
		struct iattr *	iattr
	)

simple_setattr - setattr for simple filesystem : dentry : iattr structure

Returns 0 on success, -error on failure.

simple_setattr is a simple ->setattr implementation without a proper implementation of size changes.

It can either be used for in-memory filesystems or special files on simple regular filesystems. Anything that needs to change on-disk or wire state on size changes needs its own setattr method.

Definition at line 367 of file libfs.c.

int simple_statfs	(	struct dentry *	dentry,
		struct kstatfs *	buf
	)

Definition at line 35 of file libfs.c.

char* simple_transaction_get	(	struct file *	file,
		const char __user *	buf,
		size_t	size
	)

Definition at line 690 of file libfs.c.

ssize_t simple_transaction_read	(	struct file *	file,
		char __user *	buf,
		size_t	size,
		loff_t *	pos
	)

Definition at line 721 of file libfs.c.

int simple_transaction_release	(	struct inode *	inode,
		struct file *	file
	)

Definition at line 730 of file libfs.c.

void simple_transaction_set	(	struct file *	file,
		size_t	n
	)

Definition at line 676 of file libfs.c.

int simple_unlink	(	struct inode *	dir,
		struct dentry *	dentry
	)

Definition at line 306 of file libfs.c.

int simple_write_begin	(	struct file *	file,
		struct address_space *	mapping,
		loff_t	pos,
		unsigned	len,
		unsigned	flags,
		struct page **	pagep,
		void **	fsdata
	)

Definition at line 395 of file libfs.c.

int simple_write_end	(	struct file *	file,
		struct address_space *	mapping,
		loff_t	pos,
		unsigned	len,
		unsigned	copied,
		struct page *	page,
		void *	fsdata
	)

Definition at line 439 of file libfs.c.

ssize_t simple_write_to_buffer	(	void *	to,
		size_t	available,
		loff_t *	ppos,
		const void __user *	from,
		size_t	count
	)

simple_write_to_buffer - copy data from user space to the buffer : the buffer to write to : the size of the buffer : the current position in the buffer : the user space buffer to read from : the maximum number of bytes to read

The simple_write_to_buffer() function reads up to bytes from the user space address starting at into the buffer at offset .

On success, the number of bytes written is returned and the offset is advanced by this number, or negative value is returned on error.

Definition at line 618 of file libfs.c.

Variable Documentation

struct inode_operations simple_dir_inode_operations

Initial value:

= {
    .lookup     = simple_lookup,
}

Definition at line 209 of file libfs.c.

struct file_operations simple_dir_operations

Initial value:

= {
    .open       = dcache_dir_open,
    .release    = dcache_dir_close,
    .llseek     = dcache_dir_lseek,
    .read       = generic_read_dir,
    .readdir    = dcache_readdir,
    .fsync      = noop_fsync,
}

Definition at line 200 of file libfs.c.