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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> | |
1da177e4 | 18 | #include <linux/vmalloc.h> |
e8edc6e0 | 19 | #include <linux/sched.h> |
1da177e4 | 20 | |
32c419d9 | 21 | #include "ncp_fs.h" |
1da177e4 | 22 | |
02c24a82 | 23 | static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1da177e4 | 24 | { |
02c24a82 | 25 | return filemap_write_and_wait_range(file->f_mapping, start, end); |
1da177e4 LT |
26 | } |
27 | ||
28 | /* | |
29 | * Open a file with the specified read/write mode. | |
30 | */ | |
31 | int ncp_make_open(struct inode *inode, int right) | |
32 | { | |
33 | int error; | |
34 | int access; | |
35 | ||
36 | error = -EINVAL; | |
37 | if (!inode) { | |
38 | printk(KERN_ERR "ncp_make_open: got NULL inode\n"); | |
39 | goto out; | |
40 | } | |
41 | ||
42 | DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n", | |
43 | atomic_read(&NCP_FINFO(inode)->opened), | |
44 | NCP_FINFO(inode)->volNumber, | |
45 | NCP_FINFO(inode)->dirEntNum); | |
46 | error = -EACCES; | |
8e3f9045 | 47 | mutex_lock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
48 | if (!atomic_read(&NCP_FINFO(inode)->opened)) { |
49 | struct ncp_entry_info finfo; | |
50 | int result; | |
51 | ||
52 | /* tries max. rights */ | |
53 | finfo.access = O_RDWR; | |
54 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
55 | inode, NULL, OC_MODE_OPEN, | |
56 | 0, AR_READ | AR_WRITE, &finfo); | |
57 | if (!result) | |
58 | goto update; | |
59 | /* RDWR did not succeeded, try readonly or writeonly as requested */ | |
60 | switch (right) { | |
61 | case O_RDONLY: | |
62 | finfo.access = O_RDONLY; | |
63 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
64 | inode, NULL, OC_MODE_OPEN, | |
65 | 0, AR_READ, &finfo); | |
66 | break; | |
67 | case O_WRONLY: | |
68 | finfo.access = O_WRONLY; | |
69 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
70 | inode, NULL, OC_MODE_OPEN, | |
71 | 0, AR_WRITE, &finfo); | |
72 | break; | |
73 | } | |
74 | if (result) { | |
75 | PPRINTK("ncp_make_open: failed, result=%d\n", result); | |
76 | goto out_unlock; | |
77 | } | |
78 | /* | |
79 | * Update the inode information. | |
80 | */ | |
81 | update: | |
82 | ncp_update_inode(inode, &finfo); | |
83 | atomic_set(&NCP_FINFO(inode)->opened, 1); | |
84 | } | |
85 | ||
86 | access = NCP_FINFO(inode)->access; | |
87 | PPRINTK("ncp_make_open: file open, access=%x\n", access); | |
88 | if (access == right || access == O_RDWR) { | |
89 | atomic_inc(&NCP_FINFO(inode)->opened); | |
90 | error = 0; | |
91 | } | |
92 | ||
93 | out_unlock: | |
8e3f9045 | 94 | mutex_unlock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
95 | out: |
96 | return error; | |
97 | } | |
98 | ||
99 | static ssize_t | |
100 | ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
101 | { | |
92e5baef | 102 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
103 | struct inode *inode = dentry->d_inode; |
104 | size_t already_read = 0; | |
105 | off_t pos; | |
106 | size_t bufsize; | |
107 | int error; | |
108 | void* freepage; | |
109 | size_t freelen; | |
110 | ||
111 | DPRINTK("ncp_file_read: enter %s/%s\n", | |
112 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
113 | ||
1da177e4 LT |
114 | pos = *ppos; |
115 | ||
116 | if ((ssize_t) count < 0) { | |
117 | return -EINVAL; | |
118 | } | |
119 | if (!count) | |
120 | return 0; | |
121 | if (pos > inode->i_sb->s_maxbytes) | |
122 | return 0; | |
123 | if (pos + count > inode->i_sb->s_maxbytes) { | |
124 | count = inode->i_sb->s_maxbytes - pos; | |
125 | } | |
126 | ||
127 | error = ncp_make_open(inode, O_RDONLY); | |
128 | if (error) { | |
129 | DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error); | |
130 | return error; | |
131 | } | |
132 | ||
133 | bufsize = NCP_SERVER(inode)->buffer_size; | |
134 | ||
135 | error = -EIO; | |
136 | freelen = ncp_read_bounce_size(bufsize); | |
137 | freepage = vmalloc(freelen); | |
138 | if (!freepage) | |
139 | goto outrel; | |
140 | error = 0; | |
141 | /* First read in as much as possible for each bufsize. */ | |
142 | while (already_read < count) { | |
143 | int read_this_time; | |
144 | size_t to_read = min_t(unsigned int, | |
145 | bufsize - (pos % bufsize), | |
146 | count - already_read); | |
147 | ||
148 | error = ncp_read_bounce(NCP_SERVER(inode), | |
149 | NCP_FINFO(inode)->file_handle, | |
150 | pos, to_read, buf, &read_this_time, | |
151 | freepage, freelen); | |
152 | if (error) { | |
153 | error = -EIO; /* NW errno -> Linux errno */ | |
154 | break; | |
155 | } | |
156 | pos += read_this_time; | |
157 | buf += read_this_time; | |
158 | already_read += read_this_time; | |
159 | ||
160 | if (read_this_time != to_read) { | |
161 | break; | |
162 | } | |
163 | } | |
164 | vfree(freepage); | |
165 | ||
166 | *ppos = pos; | |
167 | ||
168 | file_accessed(file); | |
169 | ||
170 | DPRINTK("ncp_file_read: exit %s/%s\n", | |
171 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
172 | outrel: | |
173 | ncp_inode_close(inode); | |
174 | return already_read ? already_read : error; | |
175 | } | |
176 | ||
177 | static ssize_t | |
178 | ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
179 | { | |
92e5baef | 180 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
181 | struct inode *inode = dentry->d_inode; |
182 | size_t already_written = 0; | |
183 | off_t pos; | |
184 | size_t bufsize; | |
185 | int errno; | |
186 | void* bouncebuffer; | |
187 | ||
188 | DPRINTK("ncp_file_write: enter %s/%s\n", | |
189 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
1da177e4 LT |
190 | if ((ssize_t) count < 0) |
191 | return -EINVAL; | |
192 | pos = *ppos; | |
193 | if (file->f_flags & O_APPEND) { | |
2e54eb96 | 194 | pos = i_size_read(inode); |
1da177e4 LT |
195 | } |
196 | ||
197 | if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) { | |
198 | if (pos >= MAX_NON_LFS) { | |
1da177e4 LT |
199 | return -EFBIG; |
200 | } | |
201 | if (count > MAX_NON_LFS - (u32)pos) { | |
202 | count = MAX_NON_LFS - (u32)pos; | |
203 | } | |
204 | } | |
205 | if (pos >= inode->i_sb->s_maxbytes) { | |
206 | if (count || pos > inode->i_sb->s_maxbytes) { | |
1da177e4 LT |
207 | return -EFBIG; |
208 | } | |
209 | } | |
210 | if (pos + count > inode->i_sb->s_maxbytes) { | |
211 | count = inode->i_sb->s_maxbytes - pos; | |
212 | } | |
213 | ||
214 | if (!count) | |
215 | return 0; | |
216 | errno = ncp_make_open(inode, O_WRONLY); | |
217 | if (errno) { | |
218 | DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno); | |
219 | return errno; | |
220 | } | |
221 | bufsize = NCP_SERVER(inode)->buffer_size; | |
222 | ||
223 | already_written = 0; | |
224 | ||
225 | bouncebuffer = vmalloc(bufsize); | |
226 | if (!bouncebuffer) { | |
227 | errno = -EIO; /* -ENOMEM */ | |
228 | goto outrel; | |
229 | } | |
230 | while (already_written < count) { | |
231 | int written_this_time; | |
232 | size_t to_write = min_t(unsigned int, | |
233 | bufsize - (pos % bufsize), | |
234 | count - already_written); | |
235 | ||
236 | if (copy_from_user(bouncebuffer, buf, to_write)) { | |
237 | errno = -EFAULT; | |
238 | break; | |
239 | } | |
240 | if (ncp_write_kernel(NCP_SERVER(inode), | |
241 | NCP_FINFO(inode)->file_handle, | |
242 | pos, to_write, bouncebuffer, &written_this_time) != 0) { | |
243 | errno = -EIO; | |
244 | break; | |
245 | } | |
246 | pos += written_this_time; | |
247 | buf += written_this_time; | |
248 | already_written += written_this_time; | |
249 | ||
250 | if (written_this_time != to_write) { | |
251 | break; | |
252 | } | |
253 | } | |
254 | vfree(bouncebuffer); | |
255 | ||
870f4817 | 256 | file_update_time(file); |
1da177e4 LT |
257 | |
258 | *ppos = pos; | |
259 | ||
2e54eb96 PV |
260 | if (pos > i_size_read(inode)) { |
261 | mutex_lock(&inode->i_mutex); | |
262 | if (pos > i_size_read(inode)) | |
263 | i_size_write(inode, pos); | |
264 | mutex_unlock(&inode->i_mutex); | |
1da177e4 LT |
265 | } |
266 | DPRINTK("ncp_file_write: exit %s/%s\n", | |
267 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
268 | outrel: | |
269 | ncp_inode_close(inode); | |
270 | return already_written ? already_written : errno; | |
271 | } | |
272 | ||
273 | static int ncp_release(struct inode *inode, struct file *file) { | |
274 | if (ncp_make_closed(inode)) { | |
275 | DPRINTK("ncp_release: failed to close\n"); | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
4b6f5d20 | 280 | const struct file_operations ncp_file_operations = |
1da177e4 | 281 | { |
2e54eb96 | 282 | .llseek = generic_file_llseek, |
1da177e4 LT |
283 | .read = ncp_file_read, |
284 | .write = ncp_file_write, | |
93d84b6d | 285 | .unlocked_ioctl = ncp_ioctl, |
54f67f63 PV |
286 | #ifdef CONFIG_COMPAT |
287 | .compat_ioctl = ncp_compat_ioctl, | |
288 | #endif | |
1da177e4 LT |
289 | .mmap = ncp_mmap, |
290 | .release = ncp_release, | |
291 | .fsync = ncp_fsync, | |
292 | }; | |
293 | ||
92e1d5be | 294 | const struct inode_operations ncp_file_inode_operations = |
1da177e4 LT |
295 | { |
296 | .setattr = ncp_notify_change, | |
297 | }; |