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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 | |
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 | */ |
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 |
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 |
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 | |
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 | |
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 |
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