WorkStruct: make allyesconfig
[linux-2.6.git] / fs / ncpfs / file.c
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         mutex_lock(&NCP_FINFO(inode)->open_mutex);
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         mutex_unlock(&NCP_FINFO(inode)->open_mutex);
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
265         file_update_time(file);
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 const 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 #ifdef CONFIG_COMPAT
293         .compat_ioctl   = ncp_compat_ioctl,
294 #endif
295         .mmap           = ncp_mmap,
296         .release        = ncp_release,
297         .fsync          = ncp_fsync,
298 };
299
300 struct inode_operations ncp_file_inode_operations =
301 {
302         .setattr        = ncp_notify_change,
303 };