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/*
* linux/fs/umsdos/file.c
*
* Written 1993 by Jacques Gelinas
* inspired from linux/fs/msdos/file.c Werner Almesberger
*
* Extended MS-DOS regular file handling primitives
*/
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/msdos_fs.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/msdos_fs.h>
#include <linux/umsdos_fs.h>
#include <asm/uaccess.h>
#include <asm/system.h>
/*
* Read a file into user space memory
*/
static ssize_t UMSDOS_file_read (
struct file *filp,
char *buf,
size_t count,
loff_t * ppos
)
{
struct dentry *dentry = filp->f_dentry;
struct inode *inode = dentry->d_inode;
int ret = fat_file_read (filp, buf, count, ppos);
/* We have to set the access time because msdos don't care */
if (!IS_RDONLY (inode)) {
inode->i_atime = CURRENT_TIME;
mark_inode_dirty(inode);
}
return ret;
}
/*
* Write a file from user space memory
*/
static ssize_t UMSDOS_file_write (
struct file *filp,
const char *buf,
size_t count,
loff_t * ppos)
{
return fat_file_write (filp, buf, count, ppos);
}
/*
* Truncate a file to 0 length.
*/
static void UMSDOS_truncate (struct inode *inode)
{
Printk (("UMSDOS_truncate\n"));
if (!IS_RDONLY (inode)) {
fat_truncate (inode);
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
mark_inode_dirty(inode);
}
}
/* Function for normal file system (512 bytes hardware sector size) */
struct file_operations umsdos_file_operations =
{
NULL, /* lseek - default */
UMSDOS_file_read, /* read */
UMSDOS_file_write, /* write */
NULL, /* readdir - bad */
NULL, /* poll - default */
NULL, /* ioctl - default */
generic_file_mmap, /* mmap */
NULL, /* no special open is needed */
NULL, /* flush */
NULL, /* release */
file_fsync /* fsync */
};
struct inode_operations umsdos_file_inode_operations =
{
&umsdos_file_operations, /* default file operations */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow_link */
generic_readpage, /* readpage */
NULL, /* writepage */
fat_bmap, /* bmap */
UMSDOS_truncate, /* truncate */
NULL, /* permission */
fat_smap /* smap */
};
/* For other with larger and unaligned file system */
struct file_operations umsdos_file_operations_no_bmap =
{
NULL, /* lseek - default */
UMSDOS_file_read, /* read */
UMSDOS_file_write, /* write */
NULL, /* readdir - bad */
NULL, /* poll - default */
NULL, /* ioctl - default */
fat_mmap, /* mmap */
NULL, /* no special open is needed */
NULL, /* flush */
NULL, /* release */
file_fsync /* fsync */
};
struct inode_operations umsdos_file_inode_operations_no_bmap =
{
&umsdos_file_operations_no_bmap, /* default file operations */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow link */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
UMSDOS_truncate, /* truncate */
NULL, /* permission */
NULL, /* smap */
};
/* For other with larger and unaligned file system with readpage */
struct file_operations umsdos_file_operations_readpage =
{
NULL, /* lseek - default */
UMSDOS_file_read, /* read */
UMSDOS_file_write, /* write */
NULL, /* readdir - bad */
NULL, /* poll - default */
NULL, /* ioctl - default */
generic_file_mmap, /* mmap */
NULL, /* no special open is needed */
NULL, /* flush */
NULL, /* release */
file_fsync /* fsync */
};
struct inode_operations umsdos_file_inode_operations_readpage =
{
&umsdos_file_operations_readpage, /* default file operations */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow link */
fat_readpage, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
UMSDOS_truncate, /* truncate */
NULL, /* permission */
NULL, /* smap */
};
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