linux/fs/ncpfs/file.c
Arjan van de Ven 4b6f5d20b0 [PATCH] Make most file operations structs in fs/ const
This is a conversion to make the various file_operations structs in fs/
const.  Basically a regexp job, with a few manual fixups

The goal is both to increase correctness (harder to accidentally write to
shared datastructures) and reducing the false sharing of cachelines with
things that get dirty in .data (while .rodata is nicely read only and thus
cache clean)

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-28 09:16:06 -08:00

301 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/slab.h>
#include <linux/vmalloc.h>
#include <linux/smp_lock.h>
#include <linux/ncp_fs.h>
#include "ncplib_kernel.h"
static int ncp_fsync(struct file *file, struct dentry *dentry, int datasync)
{
return 0;
}
/*
* 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_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);
if (!ncp_conn_valid(NCP_SERVER(inode)))
return -EIO;
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_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 (!ncp_conn_valid(NCP_SERVER(inode)))
return -EIO;
if ((ssize_t) count < 0)
return -EINVAL;
pos = *ppos;
if (file->f_flags & O_APPEND) {
pos = inode->i_size;
}
if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
if (pos >= MAX_NON_LFS) {
send_sig(SIGXFSZ, current, 0);
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) {
send_sig(SIGXFSZ, current, 0);
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 > inode->i_size) {
inode->i_size = pos;
}
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 = remote_llseek,
.read = ncp_file_read,
.write = ncp_file_write,
.ioctl = ncp_ioctl,
.mmap = ncp_mmap,
.release = ncp_release,
.fsync = ncp_fsync,
};
struct inode_operations ncp_file_inode_operations =
{
.setattr = ncp_notify_change,
};