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