]>
Commit | Line | Data |
---|---|---|
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 | ||
b41f8b84 JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
1da177e4 | 11 | #include <asm/uaccess.h> |
1da177e4 LT |
12 | |
13 | #include <linux/time.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/fcntl.h> | |
17 | #include <linux/stat.h> | |
18 | #include <linux/mm.h> | |
1da177e4 | 19 | #include <linux/vmalloc.h> |
e8edc6e0 | 20 | #include <linux/sched.h> |
1da177e4 | 21 | |
32c419d9 | 22 | #include "ncp_fs.h" |
1da177e4 | 23 | |
02c24a82 | 24 | static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1da177e4 | 25 | { |
02c24a82 | 26 | return filemap_write_and_wait_range(file->f_mapping, start, end); |
1da177e4 LT |
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) { | |
b41f8b84 | 39 | pr_err("%s: got NULL inode\n", __func__); |
1da177e4 LT |
40 | goto out; |
41 | } | |
42 | ||
d3b73ca1 | 43 | ncp_dbg(1, "opened=%d, volume # %u, dir entry # %u\n", |
1da177e4 LT |
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) { | |
e45ca8ba | 76 | ncp_vdbg("failed, result=%d\n", result); |
1da177e4 LT |
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; | |
e45ca8ba | 88 | ncp_vdbg("file open, access=%x\n", access); |
1da177e4 LT |
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 | { | |
a67f797d | 103 | struct inode *inode = file_inode(file); |
1da177e4 LT |
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 | ||
a67f797d | 111 | ncp_dbg(1, "enter %pD2\n", file); |
1da177e4 | 112 | |
1da177e4 LT |
113 | pos = *ppos; |
114 | ||
115 | if ((ssize_t) count < 0) { | |
116 | return -EINVAL; | |
117 | } | |
118 | if (!count) | |
119 | return 0; | |
120 | if (pos > inode->i_sb->s_maxbytes) | |
121 | return 0; | |
122 | if (pos + count > inode->i_sb->s_maxbytes) { | |
123 | count = inode->i_sb->s_maxbytes - pos; | |
124 | } | |
125 | ||
126 | error = ncp_make_open(inode, O_RDONLY); | |
127 | if (error) { | |
d3b73ca1 | 128 | ncp_dbg(1, "open failed, error=%d\n", error); |
1da177e4 LT |
129 | return error; |
130 | } | |
131 | ||
132 | bufsize = NCP_SERVER(inode)->buffer_size; | |
133 | ||
134 | error = -EIO; | |
135 | freelen = ncp_read_bounce_size(bufsize); | |
136 | freepage = vmalloc(freelen); | |
137 | if (!freepage) | |
138 | goto outrel; | |
139 | error = 0; | |
140 | /* First read in as much as possible for each bufsize. */ | |
141 | while (already_read < count) { | |
142 | int read_this_time; | |
143 | size_t to_read = min_t(unsigned int, | |
144 | bufsize - (pos % bufsize), | |
145 | count - already_read); | |
146 | ||
147 | error = ncp_read_bounce(NCP_SERVER(inode), | |
148 | NCP_FINFO(inode)->file_handle, | |
149 | pos, to_read, buf, &read_this_time, | |
150 | freepage, freelen); | |
151 | if (error) { | |
152 | error = -EIO; /* NW errno -> Linux errno */ | |
153 | break; | |
154 | } | |
155 | pos += read_this_time; | |
156 | buf += read_this_time; | |
157 | already_read += read_this_time; | |
158 | ||
159 | if (read_this_time != to_read) { | |
160 | break; | |
161 | } | |
162 | } | |
163 | vfree(freepage); | |
164 | ||
165 | *ppos = pos; | |
166 | ||
167 | file_accessed(file); | |
168 | ||
a67f797d | 169 | ncp_dbg(1, "exit %pD2\n", file); |
1da177e4 LT |
170 | outrel: |
171 | ncp_inode_close(inode); | |
172 | return already_read ? already_read : error; | |
173 | } | |
174 | ||
175 | static ssize_t | |
176 | ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
177 | { | |
a67f797d | 178 | struct inode *inode = file_inode(file); |
1da177e4 LT |
179 | size_t already_written = 0; |
180 | off_t pos; | |
181 | size_t bufsize; | |
182 | int errno; | |
183 | void* bouncebuffer; | |
184 | ||
a67f797d | 185 | ncp_dbg(1, "enter %pD2\n", file); |
1da177e4 LT |
186 | if ((ssize_t) count < 0) |
187 | return -EINVAL; | |
188 | pos = *ppos; | |
189 | if (file->f_flags & O_APPEND) { | |
2e54eb96 | 190 | pos = i_size_read(inode); |
1da177e4 LT |
191 | } |
192 | ||
193 | if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) { | |
194 | if (pos >= MAX_NON_LFS) { | |
1da177e4 LT |
195 | return -EFBIG; |
196 | } | |
197 | if (count > MAX_NON_LFS - (u32)pos) { | |
198 | count = MAX_NON_LFS - (u32)pos; | |
199 | } | |
200 | } | |
201 | if (pos >= inode->i_sb->s_maxbytes) { | |
202 | if (count || pos > inode->i_sb->s_maxbytes) { | |
1da177e4 LT |
203 | return -EFBIG; |
204 | } | |
205 | } | |
206 | if (pos + count > inode->i_sb->s_maxbytes) { | |
207 | count = inode->i_sb->s_maxbytes - pos; | |
208 | } | |
209 | ||
210 | if (!count) | |
211 | return 0; | |
212 | errno = ncp_make_open(inode, O_WRONLY); | |
213 | if (errno) { | |
d3b73ca1 | 214 | ncp_dbg(1, "open failed, error=%d\n", errno); |
1da177e4 LT |
215 | return errno; |
216 | } | |
217 | bufsize = NCP_SERVER(inode)->buffer_size; | |
218 | ||
219 | already_written = 0; | |
220 | ||
c3b2da31 JB |
221 | errno = file_update_time(file); |
222 | if (errno) | |
223 | goto outrel; | |
224 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
256 | *ppos = pos; |
257 | ||
2e54eb96 PV |
258 | if (pos > i_size_read(inode)) { |
259 | mutex_lock(&inode->i_mutex); | |
260 | if (pos > i_size_read(inode)) | |
261 | i_size_write(inode, pos); | |
262 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 263 | } |
a67f797d | 264 | ncp_dbg(1, "exit %pD2\n", file); |
1da177e4 LT |
265 | outrel: |
266 | ncp_inode_close(inode); | |
267 | return already_written ? already_written : errno; | |
268 | } | |
269 | ||
270 | static int ncp_release(struct inode *inode, struct file *file) { | |
271 | if (ncp_make_closed(inode)) { | |
d3b73ca1 | 272 | ncp_dbg(1, "failed to close\n"); |
1da177e4 LT |
273 | } |
274 | return 0; | |
275 | } | |
276 | ||
4b6f5d20 | 277 | const struct file_operations ncp_file_operations = |
1da177e4 | 278 | { |
2e54eb96 | 279 | .llseek = generic_file_llseek, |
1da177e4 LT |
280 | .read = ncp_file_read, |
281 | .write = ncp_file_write, | |
93d84b6d | 282 | .unlocked_ioctl = ncp_ioctl, |
54f67f63 PV |
283 | #ifdef CONFIG_COMPAT |
284 | .compat_ioctl = ncp_compat_ioctl, | |
285 | #endif | |
1da177e4 LT |
286 | .mmap = ncp_mmap, |
287 | .release = ncp_release, | |
288 | .fsync = ncp_fsync, | |
289 | }; | |
290 | ||
92e1d5be | 291 | const struct inode_operations ncp_file_inode_operations = |
1da177e4 LT |
292 | { |
293 | .setattr = ncp_notify_change, | |
294 | }; |