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/*
* file.c
*
* Copyright (C) 1995, 1996 by Volker Lendecke
*
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/ncp_fs.h>
#include <linux/locks.h>
#include "ncplib_kernel.h"
#include <linux/malloc.h>
static inline int min(int a, int b)
{
return a < b ? a : b;
}
static int ncp_fsync(struct inode *inode, struct file *file)
{
return 0;
}
int ncp_make_open(struct inode *i, int right)
{
struct nw_file_info *finfo;
if (i == NULL) {
printk("ncp_make_open: got NULL inode\n");
return -EINVAL;
}
finfo = NCP_FINFO(i);
DPRINTK("ncp_make_open: dirent->opened = %d\n", finfo->opened);
lock_super(i->i_sb);
if (finfo->opened == 0) {
finfo->access = -1;
/* tries max. rights */
if (ncp_open_create_file_or_subdir(NCP_SERVER(i),
NULL, NULL,
OC_MODE_OPEN, 0,
AR_READ | AR_WRITE,
finfo) == 0) {
finfo->access = O_RDWR;
} else if (ncp_open_create_file_or_subdir(NCP_SERVER(i),
NULL, NULL,
OC_MODE_OPEN, 0,
AR_READ,
finfo) == 0) {
finfo->access = O_RDONLY;
}
}
unlock_super(i->i_sb);
if (((right == O_RDONLY) && ((finfo->access == O_RDONLY)
|| (finfo->access == O_RDWR)))
|| ((right == O_WRONLY) && ((finfo->access == O_WRONLY)
|| (finfo->access == O_RDWR)))
|| ((right == O_RDWR) && (finfo->access == O_RDWR)))
return 0;
return -EACCES;
}
static long ncp_file_read(struct inode *inode, struct file *file, char *buf, unsigned long count)
{
int bufsize, already_read;
off_t pos;
int errno;
DPRINTK("ncp_file_read: enter %s\n", NCP_ISTRUCT(inode)->entryName);
if (inode == NULL) {
DPRINTK("ncp_file_read: inode = NULL\n");
return -EINVAL;
}
if (!ncp_conn_valid(NCP_SERVER(inode))) {
return -EIO;
}
if (!S_ISREG(inode->i_mode)) {
DPRINTK("ncp_file_read: read from non-file, mode %07o\n",
inode->i_mode);
return -EINVAL;
}
pos = file->f_pos;
if (pos + count > inode->i_size) {
count = inode->i_size - pos;
}
if (count <= 0) {
return 0;
}
if ((errno = ncp_make_open(inode, O_RDONLY)) != 0) {
return errno;
}
bufsize = NCP_SERVER(inode)->buffer_size;
already_read = 0;
/* First read in as much as possible for each bufsize. */
while (already_read < count) {
int read_this_time;
int to_read = min(bufsize - (pos % bufsize),
count - already_read);
if (ncp_read(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
pos, to_read, buf, &read_this_time) != 0) {
return -EIO; /* This is not exact, i know.. */
}
pos += read_this_time;
buf += read_this_time;
already_read += read_this_time;
if (read_this_time < to_read) {
break;
}
}
file->f_pos = pos;
if (!IS_RDONLY(inode)) {
inode->i_atime = CURRENT_TIME;
}
inode->i_dirt = 1;
DPRINTK("ncp_file_read: exit %s\n", NCP_ISTRUCT(inode)->entryName);
return already_read;
}
static long ncp_file_write(struct inode *inode, struct file *file, const char *buf,
unsigned long count)
{
int bufsize, already_written;
off_t pos;
int errno;
if (inode == NULL) {
DPRINTK("ncp_file_write: inode = NULL\n");
return -EINVAL;
}
if (!ncp_conn_valid(NCP_SERVER(inode))) {
return -EIO;
}
if (!S_ISREG(inode->i_mode)) {
DPRINTK("ncp_file_write: write to non-file, mode %07o\n",
inode->i_mode);
return -EINVAL;
}
DPRINTK("ncp_file_write: enter %s\n", NCP_ISTRUCT(inode)->entryName);
if (count <= 0) {
return 0;
}
if ((errno = ncp_make_open(inode, O_RDWR)) != 0) {
return errno;
}
pos = file->f_pos;
if (file->f_flags & O_APPEND) {
pos = inode->i_size;
}
bufsize = NCP_SERVER(inode)->buffer_size;
already_written = 0;
while (already_written < count) {
int written_this_time;
int to_write = min(bufsize - (pos % bufsize),
count - already_written);
if (ncp_write(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
pos, to_write, buf, &written_this_time) != 0) {
return -EIO;
}
pos += written_this_time;
buf += written_this_time;
already_written += written_this_time;
if (written_this_time < to_write) {
break;
}
}
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_dirt = 1;
file->f_pos = pos;
if (pos > inode->i_size) {
inode->i_size = pos;
ncp_invalid_dir_cache(NCP_INOP(inode)->dir->inode);
}
DPRINTK("ncp_file_write: exit %s\n", NCP_ISTRUCT(inode)->entryName);
return already_written;
}
static struct file_operations ncp_file_operations =
{
NULL, /* lseek - default */
ncp_file_read, /* read */
ncp_file_write, /* write */
NULL, /* readdir - bad */
NULL, /* poll - default */
ncp_ioctl, /* ioctl */
ncp_mmap, /* mmap */
NULL, /* open */
NULL, /* release */
ncp_fsync, /* fsync */
};
struct inode_operations ncp_file_inode_operations =
{
&ncp_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 */
NULL, /* bmap */
NULL /* truncate */
};
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