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> | |
1da177e4 LT |
20 | |
21 | #include <linux/ncp_fs.h> | |
22 | #include "ncplib_kernel.h" | |
23 | ||
24 | static int ncp_fsync(struct file *file, struct dentry *dentry, int datasync) | |
25 | { | |
26 | return 0; | |
27 | } | |
28 | ||
29 | /* | |
30 | * Open a file with the specified read/write mode. | |
31 | */ | |
32 | int ncp_make_open(struct inode *inode, int right) | |
33 | { | |
34 | int error; | |
35 | int access; | |
36 | ||
37 | error = -EINVAL; | |
38 | if (!inode) { | |
39 | printk(KERN_ERR "ncp_make_open: got NULL inode\n"); | |
40 | goto out; | |
41 | } | |
42 | ||
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); | |
47 | error = -EACCES; | |
8e3f9045 | 48 | mutex_lock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
49 | if (!atomic_read(&NCP_FINFO(inode)->opened)) { |
50 | struct ncp_entry_info finfo; | |
51 | int result; | |
52 | ||
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); | |
58 | if (!result) | |
59 | goto update; | |
60 | /* RDWR did not succeeded, try readonly or writeonly as requested */ | |
61 | switch (right) { | |
62 | case O_RDONLY: | |
63 | finfo.access = O_RDONLY; | |
64 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
65 | inode, NULL, OC_MODE_OPEN, | |
66 | 0, AR_READ, &finfo); | |
67 | break; | |
68 | case O_WRONLY: | |
69 | finfo.access = O_WRONLY; | |
70 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
71 | inode, NULL, OC_MODE_OPEN, | |
72 | 0, AR_WRITE, &finfo); | |
73 | break; | |
74 | } | |
75 | if (result) { | |
76 | PPRINTK("ncp_make_open: failed, result=%d\n", result); | |
77 | goto out_unlock; | |
78 | } | |
79 | /* | |
80 | * Update the inode information. | |
81 | */ | |
82 | update: | |
83 | ncp_update_inode(inode, &finfo); | |
84 | atomic_set(&NCP_FINFO(inode)->opened, 1); | |
85 | } | |
86 | ||
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); | |
91 | error = 0; | |
92 | } | |
93 | ||
94 | out_unlock: | |
8e3f9045 | 95 | mutex_unlock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
96 | out: |
97 | return error; | |
98 | } | |
99 | ||
100 | static ssize_t | |
101 | ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
102 | { | |
92e5baef | 103 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
104 | struct inode *inode = dentry->d_inode; |
105 | size_t already_read = 0; | |
106 | off_t pos; | |
107 | size_t bufsize; | |
108 | int error; | |
109 | void* freepage; | |
110 | size_t freelen; | |
111 | ||
112 | DPRINTK("ncp_file_read: enter %s/%s\n", | |
113 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
114 | ||
115 | if (!ncp_conn_valid(NCP_SERVER(inode))) | |
116 | return -EIO; | |
117 | ||
118 | pos = *ppos; | |
119 | ||
120 | if ((ssize_t) count < 0) { | |
121 | return -EINVAL; | |
122 | } | |
123 | if (!count) | |
124 | return 0; | |
125 | if (pos > inode->i_sb->s_maxbytes) | |
126 | return 0; | |
127 | if (pos + count > inode->i_sb->s_maxbytes) { | |
128 | count = inode->i_sb->s_maxbytes - pos; | |
129 | } | |
130 | ||
131 | error = ncp_make_open(inode, O_RDONLY); | |
132 | if (error) { | |
133 | DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error); | |
134 | return error; | |
135 | } | |
136 | ||
137 | bufsize = NCP_SERVER(inode)->buffer_size; | |
138 | ||
139 | error = -EIO; | |
140 | freelen = ncp_read_bounce_size(bufsize); | |
141 | freepage = vmalloc(freelen); | |
142 | if (!freepage) | |
143 | goto outrel; | |
144 | error = 0; | |
145 | /* First read in as much as possible for each bufsize. */ | |
146 | while (already_read < count) { | |
147 | int read_this_time; | |
148 | size_t to_read = min_t(unsigned int, | |
149 | bufsize - (pos % bufsize), | |
150 | count - already_read); | |
151 | ||
152 | error = ncp_read_bounce(NCP_SERVER(inode), | |
153 | NCP_FINFO(inode)->file_handle, | |
154 | pos, to_read, buf, &read_this_time, | |
155 | freepage, freelen); | |
156 | if (error) { | |
157 | error = -EIO; /* NW errno -> Linux errno */ | |
158 | break; | |
159 | } | |
160 | pos += read_this_time; | |
161 | buf += read_this_time; | |
162 | already_read += read_this_time; | |
163 | ||
164 | if (read_this_time != to_read) { | |
165 | break; | |
166 | } | |
167 | } | |
168 | vfree(freepage); | |
169 | ||
170 | *ppos = pos; | |
171 | ||
172 | file_accessed(file); | |
173 | ||
174 | DPRINTK("ncp_file_read: exit %s/%s\n", | |
175 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
176 | outrel: | |
177 | ncp_inode_close(inode); | |
178 | return already_read ? already_read : error; | |
179 | } | |
180 | ||
181 | static ssize_t | |
182 | ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
183 | { | |
92e5baef | 184 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
185 | struct inode *inode = dentry->d_inode; |
186 | size_t already_written = 0; | |
187 | off_t pos; | |
188 | size_t bufsize; | |
189 | int errno; | |
190 | void* bouncebuffer; | |
191 | ||
192 | DPRINTK("ncp_file_write: enter %s/%s\n", | |
193 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
194 | if (!ncp_conn_valid(NCP_SERVER(inode))) | |
195 | return -EIO; | |
196 | if ((ssize_t) count < 0) | |
197 | return -EINVAL; | |
198 | pos = *ppos; | |
199 | if (file->f_flags & O_APPEND) { | |
200 | pos = inode->i_size; | |
201 | } | |
202 | ||
203 | if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) { | |
204 | if (pos >= MAX_NON_LFS) { | |
205 | send_sig(SIGXFSZ, current, 0); | |
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 | send_sig(SIGXFSZ, current, 0); | |
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 | ||
870f4817 | 264 | file_update_time(file); |
1da177e4 LT |
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 | ||
4b6f5d20 | 285 | const struct file_operations ncp_file_operations = |
1da177e4 LT |
286 | { |
287 | .llseek = remote_llseek, | |
288 | .read = ncp_file_read, | |
289 | .write = ncp_file_write, | |
290 | .ioctl = ncp_ioctl, | |
54f67f63 PV |
291 | #ifdef CONFIG_COMPAT |
292 | .compat_ioctl = ncp_compat_ioctl, | |
293 | #endif | |
1da177e4 LT |
294 | .mmap = ncp_mmap, |
295 | .release = ncp_release, | |
296 | .fsync = ncp_fsync, | |
297 | }; | |
298 | ||
92e1d5be | 299 | const struct inode_operations ncp_file_inode_operations = |
1da177e4 LT |
300 | { |
301 | .setattr = ncp_notify_change, | |
302 | }; |