4 * Copyright (C) 1995, 1996 by Volker Lendecke
5 * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
9 #include <asm/uaccess.h>
10 #include <asm/system.h>
12 #include <linux/time.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/fcntl.h>
16 #include <linux/stat.h>
18 #include <linux/vmalloc.h>
19 #include <linux/sched.h>
20 #include <linux/smp_lock.h>
22 #include <linux/ncp_fs.h>
23 #include "ncplib_kernel.h"
25 static int ncp_fsync(struct file *file, int datasync)
31 * Open a file with the specified read/write mode.
33 int ncp_make_open(struct inode *inode, int right)
40 printk(KERN_ERR "ncp_make_open: got NULL inode\n");
44 DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
45 atomic_read(&NCP_FINFO(inode)->opened),
46 NCP_FINFO(inode)->volNumber,
47 NCP_FINFO(inode)->dirEntNum);
49 mutex_lock(&NCP_FINFO(inode)->open_mutex);
50 if (!atomic_read(&NCP_FINFO(inode)->opened)) {
51 struct ncp_entry_info finfo;
54 /* tries max. rights */
55 finfo.access = O_RDWR;
56 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
57 inode, NULL, OC_MODE_OPEN,
58 0, AR_READ | AR_WRITE, &finfo);
61 /* RDWR did not succeeded, try readonly or writeonly as requested */
64 finfo.access = O_RDONLY;
65 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
66 inode, NULL, OC_MODE_OPEN,
70 finfo.access = O_WRONLY;
71 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
72 inode, NULL, OC_MODE_OPEN,
77 PPRINTK("ncp_make_open: failed, result=%d\n", result);
81 * Update the inode information.
84 ncp_update_inode(inode, &finfo);
85 atomic_set(&NCP_FINFO(inode)->opened, 1);
88 access = NCP_FINFO(inode)->access;
89 PPRINTK("ncp_make_open: file open, access=%x\n", access);
90 if (access == right || access == O_RDWR) {
91 atomic_inc(&NCP_FINFO(inode)->opened);
96 mutex_unlock(&NCP_FINFO(inode)->open_mutex);
102 ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
104 struct dentry *dentry = file->f_path.dentry;
105 struct inode *inode = dentry->d_inode;
106 size_t already_read = 0;
113 DPRINTK("ncp_file_read: enter %s/%s\n",
114 dentry->d_parent->d_name.name, dentry->d_name.name);
118 if ((ssize_t) count < 0) {
123 if (pos > inode->i_sb->s_maxbytes)
125 if (pos + count > inode->i_sb->s_maxbytes) {
126 count = inode->i_sb->s_maxbytes - pos;
129 error = ncp_make_open(inode, O_RDONLY);
131 DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
135 bufsize = NCP_SERVER(inode)->buffer_size;
138 freelen = ncp_read_bounce_size(bufsize);
139 freepage = vmalloc(freelen);
143 /* First read in as much as possible for each bufsize. */
144 while (already_read < count) {
146 size_t to_read = min_t(unsigned int,
147 bufsize - (pos % bufsize),
148 count - already_read);
150 error = ncp_read_bounce(NCP_SERVER(inode),
151 NCP_FINFO(inode)->file_handle,
152 pos, to_read, buf, &read_this_time,
155 error = -EIO; /* NW errno -> Linux errno */
158 pos += read_this_time;
159 buf += read_this_time;
160 already_read += read_this_time;
162 if (read_this_time != to_read) {
172 DPRINTK("ncp_file_read: exit %s/%s\n",
173 dentry->d_parent->d_name.name, dentry->d_name.name);
175 ncp_inode_close(inode);
176 return already_read ? already_read : error;
180 ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
182 struct dentry *dentry = file->f_path.dentry;
183 struct inode *inode = dentry->d_inode;
184 size_t already_written = 0;
190 DPRINTK("ncp_file_write: enter %s/%s\n",
191 dentry->d_parent->d_name.name, dentry->d_name.name);
192 if ((ssize_t) count < 0)
195 if (file->f_flags & O_APPEND) {
196 pos = i_size_read(inode);
199 if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
200 if (pos >= MAX_NON_LFS) {
203 if (count > MAX_NON_LFS - (u32)pos) {
204 count = MAX_NON_LFS - (u32)pos;
207 if (pos >= inode->i_sb->s_maxbytes) {
208 if (count || pos > inode->i_sb->s_maxbytes) {
212 if (pos + count > inode->i_sb->s_maxbytes) {
213 count = inode->i_sb->s_maxbytes - pos;
218 errno = ncp_make_open(inode, O_WRONLY);
220 DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
223 bufsize = NCP_SERVER(inode)->buffer_size;
227 bouncebuffer = vmalloc(bufsize);
229 errno = -EIO; /* -ENOMEM */
232 while (already_written < count) {
233 int written_this_time;
234 size_t to_write = min_t(unsigned int,
235 bufsize - (pos % bufsize),
236 count - already_written);
238 if (copy_from_user(bouncebuffer, buf, to_write)) {
242 if (ncp_write_kernel(NCP_SERVER(inode),
243 NCP_FINFO(inode)->file_handle,
244 pos, to_write, bouncebuffer, &written_this_time) != 0) {
248 pos += written_this_time;
249 buf += written_this_time;
250 already_written += written_this_time;
252 if (written_this_time != to_write) {
258 file_update_time(file);
262 if (pos > i_size_read(inode)) {
263 mutex_lock(&inode->i_mutex);
264 if (pos > i_size_read(inode))
265 i_size_write(inode, pos);
266 mutex_unlock(&inode->i_mutex);
268 DPRINTK("ncp_file_write: exit %s/%s\n",
269 dentry->d_parent->d_name.name, dentry->d_name.name);
271 ncp_inode_close(inode);
272 return already_written ? already_written : errno;
275 static int ncp_release(struct inode *inode, struct file *file) {
276 if (ncp_make_closed(inode)) {
277 DPRINTK("ncp_release: failed to close\n");
282 const struct file_operations ncp_file_operations =
284 .llseek = generic_file_llseek,
285 .read = ncp_file_read,
286 .write = ncp_file_write,
287 .unlocked_ioctl = ncp_ioctl,
289 .compat_ioctl = ncp_compat_ioctl,
292 .release = ncp_release,
296 const struct inode_operations ncp_file_inode_operations =
298 .setattr = ncp_notify_change,