1
2
3
4
5
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/vmalloc.h>
19#include <linux/sched.h>
20
21#include "ncp_fs.h"
22
23static int ncp_fsync(struct file *file, int datasync)
24{
25 return 0;
26}
27
28
29
30
31int 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;
47 mutex_lock(&NCP_FINFO(inode)->open_mutex);
48 if (!atomic_read(&NCP_FINFO(inode)->opened)) {
49 struct ncp_entry_info finfo;
50 int result;
51
52
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
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
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
93out_unlock:
94 mutex_unlock(&NCP_FINFO(inode)->open_mutex);
95out:
96 return error;
97}
98
99static ssize_t
100ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
101{
102 struct dentry *dentry = file->f_path.dentry;
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
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
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;
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);
172outrel:
173 ncp_inode_close(inode);
174 return already_read ? already_read : error;
175}
176
177static ssize_t
178ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
179{
180 struct dentry *dentry = file->f_path.dentry;
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);
190 if ((ssize_t) count < 0)
191 return -EINVAL;
192 pos = *ppos;
193 if (file->f_flags & O_APPEND) {
194 pos = i_size_read(inode);
195 }
196
197 if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
198 if (pos >= MAX_NON_LFS) {
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) {
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;
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
256 file_update_time(file);
257
258 *ppos = pos;
259
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);
265 }
266 DPRINTK("ncp_file_write: exit %s/%s\n",
267 dentry->d_parent->d_name.name, dentry->d_name.name);
268outrel:
269 ncp_inode_close(inode);
270 return already_written ? already_written : errno;
271}
272
273static 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
280const struct file_operations ncp_file_operations =
281{
282 .llseek = generic_file_llseek,
283 .read = ncp_file_read,
284 .write = ncp_file_write,
285 .unlocked_ioctl = ncp_ioctl,
286#ifdef CONFIG_COMPAT
287 .compat_ioctl = ncp_compat_ioctl,
288#endif
289 .mmap = ncp_mmap,
290 .release = ncp_release,
291 .fsync = ncp_fsync,
292};
293
294const struct inode_operations ncp_file_inode_operations =
295{
296 .setattr = ncp_notify_change,
297};
298
