1 /*
2 * file.c
3 *
4 * Copyright (C) 1995, 1996 by Volker Lendecke
5 * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
6 *
7 */
8
9 #include <asm/uaccess.h>
10 #include <asm/system.h>
11
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>
17 #include <linux/mm.h>
18 #include <linux/slab.h>
19 #include <linux/vmalloc.h>
20 #include <linux/sched.h>
21 #include <linux/smp_lock.h>
22
23 #include <linux/ncp_fs.h>
24 #include "ncplib_kernel.h"
25
ncp_fsync(struct file * file,struct dentry * dentry,int datasync)26 static int ncp_fsync(struct file *file, struct dentry *dentry, int datasync)
27 {
28 return 0;
29 }
30
31 /*
32 * Open a file with the specified read/write mode.
33 */
ncp_make_open(struct inode * inode,int right)34 int ncp_make_open(struct inode *inode, int right)
35 {
36 int error;
37 int access;
38
39 error = -EINVAL;
40 if (!inode) {
41 printk(KERN_ERR "ncp_make_open: got NULL inode\n");
42 goto out;
43 }
44
45 DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
46 atomic_read(&NCP_FINFO(inode)->opened),
47 NCP_FINFO(inode)->volNumber,
48 NCP_FINFO(inode)->dirEntNum);
49 error = -EACCES;
50 mutex_lock(&NCP_FINFO(inode)->open_mutex);
51 if (!atomic_read(&NCP_FINFO(inode)->opened)) {
52 struct ncp_entry_info finfo;
53 int result;
54
55 /* tries max. rights */
56 finfo.access = O_RDWR;
57 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
58 inode, NULL, OC_MODE_OPEN,
59 0, AR_READ | AR_WRITE, &finfo);
60 if (!result)
61 goto update;
62 /* RDWR did not succeeded, try readonly or writeonly as requested */
63 switch (right) {
64 case O_RDONLY:
65 finfo.access = O_RDONLY;
66 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
67 inode, NULL, OC_MODE_OPEN,
68 0, AR_READ, &finfo);
69 break;
70 case O_WRONLY:
71 finfo.access = O_WRONLY;
72 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
73 inode, NULL, OC_MODE_OPEN,
74 0, AR_WRITE, &finfo);
75 break;
76 }
77 if (result) {
78 PPRINTK("ncp_make_open: failed, result=%d\n", result);
79 goto out_unlock;
80 }
81 /*
82 * Update the inode information.
83 */
84 update:
85 ncp_update_inode(inode, &finfo);
86 atomic_set(&NCP_FINFO(inode)->opened, 1);
87 }
88
89 access = NCP_FINFO(inode)->access;
90 PPRINTK("ncp_make_open: file open, access=%x\n", access);
91 if (access == right || access == O_RDWR) {
92 atomic_inc(&NCP_FINFO(inode)->opened);
93 error = 0;
94 }
95
96 out_unlock:
97 mutex_unlock(&NCP_FINFO(inode)->open_mutex);
98 out:
99 return error;
100 }
101
102 static ssize_t
ncp_file_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)103 ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
104 {
105 struct dentry *dentry = file->f_path.dentry;
106 struct inode *inode = dentry->d_inode;
107 size_t already_read = 0;
108 off_t pos;
109 size_t bufsize;
110 int error;
111 void* freepage;
112 size_t freelen;
113
114 DPRINTK("ncp_file_read: enter %s/%s\n",
115 dentry->d_parent->d_name.name, dentry->d_name.name);
116
117 if (!ncp_conn_valid(NCP_SERVER(inode)))
118 return -EIO;
119
120 pos = *ppos;
121
122 if ((ssize_t) count < 0) {
123 return -EINVAL;
124 }
125 if (!count)
126 return 0;
127 if (pos > inode->i_sb->s_maxbytes)
128 return 0;
129 if (pos + count > inode->i_sb->s_maxbytes) {
130 count = inode->i_sb->s_maxbytes - pos;
131 }
132
133 error = ncp_make_open(inode, O_RDONLY);
134 if (error) {
135 DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
136 return error;
137 }
138
139 bufsize = NCP_SERVER(inode)->buffer_size;
140
141 error = -EIO;
142 freelen = ncp_read_bounce_size(bufsize);
143 freepage = vmalloc(freelen);
144 if (!freepage)
145 goto outrel;
146 error = 0;
147 /* First read in as much as possible for each bufsize. */
148 while (already_read < count) {
149 int read_this_time;
150 size_t to_read = min_t(unsigned int,
151 bufsize - (pos % bufsize),
152 count - already_read);
153
154 error = ncp_read_bounce(NCP_SERVER(inode),
155 NCP_FINFO(inode)->file_handle,
156 pos, to_read, buf, &read_this_time,
157 freepage, freelen);
158 if (error) {
159 error = -EIO; /* NW errno -> Linux errno */
160 break;
161 }
162 pos += read_this_time;
163 buf += read_this_time;
164 already_read += read_this_time;
165
166 if (read_this_time != to_read) {
167 break;
168 }
169 }
170 vfree(freepage);
171
172 *ppos = pos;
173
174 file_accessed(file);
175
176 DPRINTK("ncp_file_read: exit %s/%s\n",
177 dentry->d_parent->d_name.name, dentry->d_name.name);
178 outrel:
179 ncp_inode_close(inode);
180 return already_read ? already_read : error;
181 }
182
183 static ssize_t
ncp_file_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)184 ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
185 {
186 struct dentry *dentry = file->f_path.dentry;
187 struct inode *inode = dentry->d_inode;
188 size_t already_written = 0;
189 off_t pos;
190 size_t bufsize;
191 int errno;
192 void* bouncebuffer;
193
194 DPRINTK("ncp_file_write: enter %s/%s\n",
195 dentry->d_parent->d_name.name, dentry->d_name.name);
196 if (!ncp_conn_valid(NCP_SERVER(inode)))
197 return -EIO;
198 if ((ssize_t) count < 0)
199 return -EINVAL;
200 pos = *ppos;
201 if (file->f_flags & O_APPEND) {
202 pos = inode->i_size;
203 }
204
205 if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
206 if (pos >= MAX_NON_LFS) {
207 return -EFBIG;
208 }
209 if (count > MAX_NON_LFS - (u32)pos) {
210 count = MAX_NON_LFS - (u32)pos;
211 }
212 }
213 if (pos >= inode->i_sb->s_maxbytes) {
214 if (count || pos > inode->i_sb->s_maxbytes) {
215 return -EFBIG;
216 }
217 }
218 if (pos + count > inode->i_sb->s_maxbytes) {
219 count = inode->i_sb->s_maxbytes - pos;
220 }
221
222 if (!count)
223 return 0;
224 errno = ncp_make_open(inode, O_WRONLY);
225 if (errno) {
226 DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
227 return errno;
228 }
229 bufsize = NCP_SERVER(inode)->buffer_size;
230
231 already_written = 0;
232
233 bouncebuffer = vmalloc(bufsize);
234 if (!bouncebuffer) {
235 errno = -EIO; /* -ENOMEM */
236 goto outrel;
237 }
238 while (already_written < count) {
239 int written_this_time;
240 size_t to_write = min_t(unsigned int,
241 bufsize - (pos % bufsize),
242 count - already_written);
243
244 if (copy_from_user(bouncebuffer, buf, to_write)) {
245 errno = -EFAULT;
246 break;
247 }
248 if (ncp_write_kernel(NCP_SERVER(inode),
249 NCP_FINFO(inode)->file_handle,
250 pos, to_write, bouncebuffer, &written_this_time) != 0) {
251 errno = -EIO;
252 break;
253 }
254 pos += written_this_time;
255 buf += written_this_time;
256 already_written += written_this_time;
257
258 if (written_this_time != to_write) {
259 break;
260 }
261 }
262 vfree(bouncebuffer);
263
264 file_update_time(file);
265
266 *ppos = pos;
267
268 if (pos > inode->i_size) {
269 inode->i_size = pos;
270 }
271 DPRINTK("ncp_file_write: exit %s/%s\n",
272 dentry->d_parent->d_name.name, dentry->d_name.name);
273 outrel:
274 ncp_inode_close(inode);
275 return already_written ? already_written : errno;
276 }
277
ncp_release(struct inode * inode,struct file * file)278 static int ncp_release(struct inode *inode, struct file *file) {
279 if (ncp_make_closed(inode)) {
280 DPRINTK("ncp_release: failed to close\n");
281 }
282 return 0;
283 }
284
ncp_remote_llseek(struct file * file,loff_t offset,int origin)285 static loff_t ncp_remote_llseek(struct file *file, loff_t offset, int origin)
286 {
287 loff_t ret;
288 lock_kernel();
289 ret = generic_file_llseek_unlocked(file, offset, origin);
290 unlock_kernel();
291 return ret;
292 }
293
294 const struct file_operations ncp_file_operations =
295 {
296 .llseek = ncp_remote_llseek,
297 .read = ncp_file_read,
298 .write = ncp_file_write,
299 .ioctl = ncp_ioctl,
300 #ifdef CONFIG_COMPAT
301 .compat_ioctl = ncp_compat_ioctl,
302 #endif
303 .mmap = ncp_mmap,
304 .release = ncp_release,
305 .fsync = ncp_fsync,
306 };
307
308 const struct inode_operations ncp_file_inode_operations =
309 {
310 .setattr = ncp_notify_change,
311 };
312