298 lines
6.7 KiB
C
298 lines
6.7 KiB
C
/*
|
|
* file.c
|
|
*
|
|
* Copyright (C) 1995, 1996 by Volker Lendecke
|
|
* Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
|
|
*
|
|
*/
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include "ncp_fs.h"
|
|
|
|
static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
|
|
return filemap_write_and_wait_range(file->f_mapping, start, end);
|
|
}
|
|
|
|
/*
|
|
* Open a file with the specified read/write mode.
|
|
*/
|
|
int ncp_make_open(struct inode *inode, int right)
|
|
{
|
|
int error;
|
|
int access;
|
|
|
|
error = -EINVAL;
|
|
if (!inode) {
|
|
printk(KERN_ERR "ncp_make_open: got NULL inode\n");
|
|
goto out;
|
|
}
|
|
|
|
DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
|
|
atomic_read(&NCP_FINFO(inode)->opened),
|
|
NCP_FINFO(inode)->volNumber,
|
|
NCP_FINFO(inode)->dirEntNum);
|
|
error = -EACCES;
|
|
mutex_lock(&NCP_FINFO(inode)->open_mutex);
|
|
if (!atomic_read(&NCP_FINFO(inode)->opened)) {
|
|
struct ncp_entry_info finfo;
|
|
int result;
|
|
|
|
/* tries max. rights */
|
|
finfo.access = O_RDWR;
|
|
result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
|
|
inode, NULL, OC_MODE_OPEN,
|
|
0, AR_READ | AR_WRITE, &finfo);
|
|
if (!result)
|
|
goto update;
|
|
/* RDWR did not succeeded, try readonly or writeonly as requested */
|
|
switch (right) {
|
|
case O_RDONLY:
|
|
finfo.access = O_RDONLY;
|
|
result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
|
|
inode, NULL, OC_MODE_OPEN,
|
|
0, AR_READ, &finfo);
|
|
break;
|
|
case O_WRONLY:
|
|
finfo.access = O_WRONLY;
|
|
result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
|
|
inode, NULL, OC_MODE_OPEN,
|
|
0, AR_WRITE, &finfo);
|
|
break;
|
|
}
|
|
if (result) {
|
|
PPRINTK("ncp_make_open: failed, result=%d\n", result);
|
|
goto out_unlock;
|
|
}
|
|
/*
|
|
* Update the inode information.
|
|
*/
|
|
update:
|
|
ncp_update_inode(inode, &finfo);
|
|
atomic_set(&NCP_FINFO(inode)->opened, 1);
|
|
}
|
|
|
|
access = NCP_FINFO(inode)->access;
|
|
PPRINTK("ncp_make_open: file open, access=%x\n", access);
|
|
if (access == right || access == O_RDWR) {
|
|
atomic_inc(&NCP_FINFO(inode)->opened);
|
|
error = 0;
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&NCP_FINFO(inode)->open_mutex);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static ssize_t
|
|
ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
|
|
{
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
size_t already_read = 0;
|
|
off_t pos;
|
|
size_t bufsize;
|
|
int error;
|
|
void* freepage;
|
|
size_t freelen;
|
|
|
|
DPRINTK("ncp_file_read: enter %s/%s\n",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
|
|
pos = *ppos;
|
|
|
|
if ((ssize_t) count < 0) {
|
|
return -EINVAL;
|
|
}
|
|
if (!count)
|
|
return 0;
|
|
if (pos > inode->i_sb->s_maxbytes)
|
|
return 0;
|
|
if (pos + count > inode->i_sb->s_maxbytes) {
|
|
count = inode->i_sb->s_maxbytes - pos;
|
|
}
|
|
|
|
error = ncp_make_open(inode, O_RDONLY);
|
|
if (error) {
|
|
DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
|
|
return error;
|
|
}
|
|
|
|
bufsize = NCP_SERVER(inode)->buffer_size;
|
|
|
|
error = -EIO;
|
|
freelen = ncp_read_bounce_size(bufsize);
|
|
freepage = vmalloc(freelen);
|
|
if (!freepage)
|
|
goto outrel;
|
|
error = 0;
|
|
/* First read in as much as possible for each bufsize. */
|
|
while (already_read < count) {
|
|
int read_this_time;
|
|
size_t to_read = min_t(unsigned int,
|
|
bufsize - (pos % bufsize),
|
|
count - already_read);
|
|
|
|
error = ncp_read_bounce(NCP_SERVER(inode),
|
|
NCP_FINFO(inode)->file_handle,
|
|
pos, to_read, buf, &read_this_time,
|
|
freepage, freelen);
|
|
if (error) {
|
|
error = -EIO; /* NW errno -> Linux errno */
|
|
break;
|
|
}
|
|
pos += read_this_time;
|
|
buf += read_this_time;
|
|
already_read += read_this_time;
|
|
|
|
if (read_this_time != to_read) {
|
|
break;
|
|
}
|
|
}
|
|
vfree(freepage);
|
|
|
|
*ppos = pos;
|
|
|
|
file_accessed(file);
|
|
|
|
DPRINTK("ncp_file_read: exit %s/%s\n",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
outrel:
|
|
ncp_inode_close(inode);
|
|
return already_read ? already_read : error;
|
|
}
|
|
|
|
static ssize_t
|
|
ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
|
|
{
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
size_t already_written = 0;
|
|
off_t pos;
|
|
size_t bufsize;
|
|
int errno;
|
|
void* bouncebuffer;
|
|
|
|
DPRINTK("ncp_file_write: enter %s/%s\n",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
if ((ssize_t) count < 0)
|
|
return -EINVAL;
|
|
pos = *ppos;
|
|
if (file->f_flags & O_APPEND) {
|
|
pos = i_size_read(inode);
|
|
}
|
|
|
|
if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
|
|
if (pos >= MAX_NON_LFS) {
|
|
return -EFBIG;
|
|
}
|
|
if (count > MAX_NON_LFS - (u32)pos) {
|
|
count = MAX_NON_LFS - (u32)pos;
|
|
}
|
|
}
|
|
if (pos >= inode->i_sb->s_maxbytes) {
|
|
if (count || pos > inode->i_sb->s_maxbytes) {
|
|
return -EFBIG;
|
|
}
|
|
}
|
|
if (pos + count > inode->i_sb->s_maxbytes) {
|
|
count = inode->i_sb->s_maxbytes - pos;
|
|
}
|
|
|
|
if (!count)
|
|
return 0;
|
|
errno = ncp_make_open(inode, O_WRONLY);
|
|
if (errno) {
|
|
DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
|
|
return errno;
|
|
}
|
|
bufsize = NCP_SERVER(inode)->buffer_size;
|
|
|
|
already_written = 0;
|
|
|
|
bouncebuffer = vmalloc(bufsize);
|
|
if (!bouncebuffer) {
|
|
errno = -EIO; /* -ENOMEM */
|
|
goto outrel;
|
|
}
|
|
while (already_written < count) {
|
|
int written_this_time;
|
|
size_t to_write = min_t(unsigned int,
|
|
bufsize - (pos % bufsize),
|
|
count - already_written);
|
|
|
|
if (copy_from_user(bouncebuffer, buf, to_write)) {
|
|
errno = -EFAULT;
|
|
break;
|
|
}
|
|
if (ncp_write_kernel(NCP_SERVER(inode),
|
|
NCP_FINFO(inode)->file_handle,
|
|
pos, to_write, bouncebuffer, &written_this_time) != 0) {
|
|
errno = -EIO;
|
|
break;
|
|
}
|
|
pos += written_this_time;
|
|
buf += written_this_time;
|
|
already_written += written_this_time;
|
|
|
|
if (written_this_time != to_write) {
|
|
break;
|
|
}
|
|
}
|
|
vfree(bouncebuffer);
|
|
|
|
file_update_time(file);
|
|
|
|
*ppos = pos;
|
|
|
|
if (pos > i_size_read(inode)) {
|
|
mutex_lock(&inode->i_mutex);
|
|
if (pos > i_size_read(inode))
|
|
i_size_write(inode, pos);
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
DPRINTK("ncp_file_write: exit %s/%s\n",
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
outrel:
|
|
ncp_inode_close(inode);
|
|
return already_written ? already_written : errno;
|
|
}
|
|
|
|
static int ncp_release(struct inode *inode, struct file *file) {
|
|
if (ncp_make_closed(inode)) {
|
|
DPRINTK("ncp_release: failed to close\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations ncp_file_operations =
|
|
{
|
|
.llseek = generic_file_llseek,
|
|
.read = ncp_file_read,
|
|
.write = ncp_file_write,
|
|
.unlocked_ioctl = ncp_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ncp_compat_ioctl,
|
|
#endif
|
|
.mmap = ncp_mmap,
|
|
.release = ncp_release,
|
|
.fsync = ncp_fsync,
|
|
};
|
|
|
|
const struct inode_operations ncp_file_inode_operations =
|
|
{
|
|
.setattr = ncp_notify_change,
|
|
};
|