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Commit | Line | Data |
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1da177e4 LT |
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/smp_lock.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 | down(&NCP_FINFO(inode)->open_sem); | |
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 | up(&NCP_FINFO(inode)->open_sem); | |
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_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_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 | send_sig(SIGXFSZ, current, 0); | |
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 | send_sig(SIGXFSZ, current, 0); | |
216 | return -EFBIG; | |
217 | } | |
218 | } | |
219 | if (pos + count > inode->i_sb->s_maxbytes) { | |
220 | count = inode->i_sb->s_maxbytes - pos; | |
221 | } | |
222 | ||
223 | if (!count) | |
224 | return 0; | |
225 | errno = ncp_make_open(inode, O_WRONLY); | |
226 | if (errno) { | |
227 | DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno); | |
228 | return errno; | |
229 | } | |
230 | bufsize = NCP_SERVER(inode)->buffer_size; | |
231 | ||
232 | already_written = 0; | |
233 | ||
234 | bouncebuffer = vmalloc(bufsize); | |
235 | if (!bouncebuffer) { | |
236 | errno = -EIO; /* -ENOMEM */ | |
237 | goto outrel; | |
238 | } | |
239 | while (already_written < count) { | |
240 | int written_this_time; | |
241 | size_t to_write = min_t(unsigned int, | |
242 | bufsize - (pos % bufsize), | |
243 | count - already_written); | |
244 | ||
245 | if (copy_from_user(bouncebuffer, buf, to_write)) { | |
246 | errno = -EFAULT; | |
247 | break; | |
248 | } | |
249 | if (ncp_write_kernel(NCP_SERVER(inode), | |
250 | NCP_FINFO(inode)->file_handle, | |
251 | pos, to_write, bouncebuffer, &written_this_time) != 0) { | |
252 | errno = -EIO; | |
253 | break; | |
254 | } | |
255 | pos += written_this_time; | |
256 | buf += written_this_time; | |
257 | already_written += written_this_time; | |
258 | ||
259 | if (written_this_time != to_write) { | |
260 | break; | |
261 | } | |
262 | } | |
263 | vfree(bouncebuffer); | |
264 | ||
870f4817 | 265 | file_update_time(file); |
1da177e4 LT |
266 | |
267 | *ppos = pos; | |
268 | ||
269 | if (pos > inode->i_size) { | |
270 | inode->i_size = pos; | |
271 | } | |
272 | DPRINTK("ncp_file_write: exit %s/%s\n", | |
273 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
274 | outrel: | |
275 | ncp_inode_close(inode); | |
276 | return already_written ? already_written : errno; | |
277 | } | |
278 | ||
279 | static int ncp_release(struct inode *inode, struct file *file) { | |
280 | if (ncp_make_closed(inode)) { | |
281 | DPRINTK("ncp_release: failed to close\n"); | |
282 | } | |
283 | return 0; | |
284 | } | |
285 | ||
286 | struct file_operations ncp_file_operations = | |
287 | { | |
288 | .llseek = remote_llseek, | |
289 | .read = ncp_file_read, | |
290 | .write = ncp_file_write, | |
291 | .ioctl = ncp_ioctl, | |
292 | .mmap = ncp_mmap, | |
293 | .release = ncp_release, | |
294 | .fsync = ncp_fsync, | |
295 | }; | |
296 | ||
297 | struct inode_operations ncp_file_inode_operations = | |
298 | { | |
299 | .setattr = ncp_notify_change, | |
300 | }; |