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>
21 #include <linux/ncp_fs.h>
22 #include "ncplib_kernel.h"
24 static int ncp_fsync(struct file *file, int datasync)
30 * Open a file with the specified read/write mode.
32 int ncp_make_open(struct inode *inode, int right)
39 printk(KERN_ERR "ncp_make_open: got NULL inode\n");
43 DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
44 atomic_read(&NCP_FINFO(inode)->opened),
45 NCP_FINFO(inode)->volNumber,
46 NCP_FINFO(inode)->dirEntNum);
48 mutex_lock(&NCP_FINFO(inode)->open_mutex);
49 if (!atomic_read(&NCP_FINFO(inode)->opened)) {
50 struct ncp_entry_info finfo;
53 /* tries max. rights */
54 finfo.access = O_RDWR;
55 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
56 inode, NULL, OC_MODE_OPEN,
57 0, AR_READ | AR_WRITE, &finfo);
60 /* RDWR did not succeeded, try readonly or writeonly as requested */
63 finfo.access = O_RDONLY;
64 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
65 inode, NULL, OC_MODE_OPEN,
69 finfo.access = O_WRONLY;
70 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
71 inode, NULL, OC_MODE_OPEN,
76 PPRINTK("ncp_make_open: failed, result=%d\n", result);
80 * Update the inode information.
83 ncp_update_inode(inode, &finfo);
84 atomic_set(&NCP_FINFO(inode)->opened, 1);
87 access = NCP_FINFO(inode)->access;
88 PPRINTK("ncp_make_open: file open, access=%x\n", access);
89 if (access == right || access == O_RDWR) {
90 atomic_inc(&NCP_FINFO(inode)->opened);
95 mutex_unlock(&NCP_FINFO(inode)->open_mutex);
101 ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
103 struct dentry *dentry = file->f_path.dentry;
104 struct inode *inode = dentry->d_inode;
105 size_t already_read = 0;
112 DPRINTK("ncp_file_read: enter %s/%s\n",
113 dentry->d_parent->d_name.name, dentry->d_name.name);
117 if ((ssize_t) count < 0) {
122 if (pos > inode->i_sb->s_maxbytes)
124 if (pos + count > inode->i_sb->s_maxbytes) {
125 count = inode->i_sb->s_maxbytes - pos;
128 error = ncp_make_open(inode, O_RDONLY);
130 DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
134 bufsize = NCP_SERVER(inode)->buffer_size;
137 freelen = ncp_read_bounce_size(bufsize);
138 freepage = vmalloc(freelen);
142 /* First read in as much as possible for each bufsize. */
143 while (already_read < count) {
145 size_t to_read = min_t(unsigned int,
146 bufsize - (pos % bufsize),
147 count - already_read);
149 error = ncp_read_bounce(NCP_SERVER(inode),
150 NCP_FINFO(inode)->file_handle,
151 pos, to_read, buf, &read_this_time,
154 error = -EIO; /* NW errno -> Linux errno */
157 pos += read_this_time;
158 buf += read_this_time;
159 already_read += read_this_time;
161 if (read_this_time != to_read) {
171 DPRINTK("ncp_file_read: exit %s/%s\n",
172 dentry->d_parent->d_name.name, dentry->d_name.name);
174 ncp_inode_close(inode);
175 return already_read ? already_read : error;
179 ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
181 struct dentry *dentry = file->f_path.dentry;
182 struct inode *inode = dentry->d_inode;
183 size_t already_written = 0;
189 DPRINTK("ncp_file_write: enter %s/%s\n",
190 dentry->d_parent->d_name.name, dentry->d_name.name);
191 if ((ssize_t) count < 0)
194 if (file->f_flags & O_APPEND) {
195 pos = i_size_read(inode);
198 if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
199 if (pos >= MAX_NON_LFS) {
202 if (count > MAX_NON_LFS - (u32)pos) {
203 count = MAX_NON_LFS - (u32)pos;
206 if (pos >= inode->i_sb->s_maxbytes) {
207 if (count || pos > inode->i_sb->s_maxbytes) {
211 if (pos + count > inode->i_sb->s_maxbytes) {
212 count = inode->i_sb->s_maxbytes - pos;
217 errno = ncp_make_open(inode, O_WRONLY);
219 DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
222 bufsize = NCP_SERVER(inode)->buffer_size;
226 bouncebuffer = vmalloc(bufsize);
228 errno = -EIO; /* -ENOMEM */
231 while (already_written < count) {
232 int written_this_time;
233 size_t to_write = min_t(unsigned int,
234 bufsize - (pos % bufsize),
235 count - already_written);
237 if (copy_from_user(bouncebuffer, buf, to_write)) {
241 if (ncp_write_kernel(NCP_SERVER(inode),
242 NCP_FINFO(inode)->file_handle,
243 pos, to_write, bouncebuffer, &written_this_time) != 0) {
247 pos += written_this_time;
248 buf += written_this_time;
249 already_written += written_this_time;
251 if (written_this_time != to_write) {
257 file_update_time(file);
261 if (pos > i_size_read(inode)) {
262 mutex_lock(&inode->i_mutex);
263 if (pos > i_size_read(inode))
264 i_size_write(inode, pos);
265 mutex_unlock(&inode->i_mutex);
267 DPRINTK("ncp_file_write: exit %s/%s\n",
268 dentry->d_parent->d_name.name, dentry->d_name.name);
270 ncp_inode_close(inode);
271 return already_written ? already_written : errno;
274 static int ncp_release(struct inode *inode, struct file *file) {
275 if (ncp_make_closed(inode)) {
276 DPRINTK("ncp_release: failed to close\n");
281 const struct file_operations ncp_file_operations =
283 .llseek = generic_file_llseek,
284 .read = ncp_file_read,
285 .write = ncp_file_write,
286 .unlocked_ioctl = ncp_ioctl,
288 .compat_ioctl = ncp_compat_ioctl,
291 .release = ncp_release,
295 const struct inode_operations ncp_file_inode_operations =
297 .setattr = ncp_notify_change,