fs/fscache/stats.c: fix memory leak
[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
11 #include <linux/time.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/fcntl.h>
15 #include <linux/stat.h>
16 #include <linux/mm.h>
17 #include <linux/vmalloc.h>
18 #include <linux/sched.h>
19
20 #include "ncp_fs.h"
21
22 static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync)
23 {
24         return filemap_write_and_wait_range(file->f_mapping, start, end);
25 }
26
27 /*
28  * Open a file with the specified read/write mode.
29  */
30 int ncp_make_open(struct inode *inode, int right)
31 {
32         int error;
33         int access;
34
35         error = -EINVAL;
36         if (!inode) {
37                 printk(KERN_ERR "ncp_make_open: got NULL inode\n");
38                 goto out;
39         }
40
41         DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
42                 atomic_read(&NCP_FINFO(inode)->opened), 
43                 NCP_FINFO(inode)->volNumber, 
44                 NCP_FINFO(inode)->dirEntNum);
45         error = -EACCES;
46         mutex_lock(&NCP_FINFO(inode)->open_mutex);
47         if (!atomic_read(&NCP_FINFO(inode)->opened)) {
48                 struct ncp_entry_info finfo;
49                 int result;
50
51                 /* tries max. rights */
52                 finfo.access = O_RDWR;
53                 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
54                                         inode, NULL, OC_MODE_OPEN,
55                                         0, AR_READ | AR_WRITE, &finfo);
56                 if (!result)
57                         goto update;
58                 /* RDWR did not succeeded, try readonly or writeonly as requested */
59                 switch (right) {
60                         case O_RDONLY:
61                                 finfo.access = O_RDONLY;
62                                 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
63                                         inode, NULL, OC_MODE_OPEN,
64                                         0, AR_READ, &finfo);
65                                 break;
66                         case O_WRONLY:
67                                 finfo.access = O_WRONLY;
68                                 result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
69                                         inode, NULL, OC_MODE_OPEN,
70                                         0, AR_WRITE, &finfo);
71                                 break;
72                 }
73                 if (result) {
74                         PPRINTK("ncp_make_open: failed, result=%d\n", result);
75                         goto out_unlock;
76                 }
77                 /*
78                  * Update the inode information.
79                  */
80         update:
81                 ncp_update_inode(inode, &finfo);
82                 atomic_set(&NCP_FINFO(inode)->opened, 1);
83         }
84
85         access = NCP_FINFO(inode)->access;
86         PPRINTK("ncp_make_open: file open, access=%x\n", access);
87         if (access == right || access == O_RDWR) {
88                 atomic_inc(&NCP_FINFO(inode)->opened);
89                 error = 0;
90         }
91
92 out_unlock:
93         mutex_unlock(&NCP_FINFO(inode)->open_mutex);
94 out:
95         return error;
96 }
97
98 static ssize_t
99 ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
100 {
101         struct dentry *dentry = file->f_path.dentry;
102         struct inode *inode = dentry->d_inode;
103         size_t already_read = 0;
104         off_t pos;
105         size_t bufsize;
106         int error;
107         void* freepage;
108         size_t freelen;
109
110         DPRINTK("ncp_file_read: enter %s/%s\n",
111                 dentry->d_parent->d_name.name, dentry->d_name.name);
112
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) {
128                 DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
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
169         DPRINTK("ncp_file_read: exit %s/%s\n",
170                 dentry->d_parent->d_name.name, dentry->d_name.name);
171 outrel:
172         ncp_inode_close(inode);         
173         return already_read ? already_read : error;
174 }
175
176 static ssize_t
177 ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
178 {
179         struct dentry *dentry = file->f_path.dentry;
180         struct inode *inode = dentry->d_inode;
181         size_t already_written = 0;
182         off_t pos;
183         size_t bufsize;
184         int errno;
185         void* bouncebuffer;
186
187         DPRINTK("ncp_file_write: enter %s/%s\n",
188                 dentry->d_parent->d_name.name, dentry->d_name.name);
189         if ((ssize_t) count < 0)
190                 return -EINVAL;
191         pos = *ppos;
192         if (file->f_flags & O_APPEND) {
193                 pos = i_size_read(inode);
194         }
195
196         if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
197                 if (pos >= MAX_NON_LFS) {
198                         return -EFBIG;
199                 }
200                 if (count > MAX_NON_LFS - (u32)pos) {
201                         count = MAX_NON_LFS - (u32)pos;
202                 }
203         }
204         if (pos >= inode->i_sb->s_maxbytes) {
205                 if (count || pos > inode->i_sb->s_maxbytes) {
206                         return -EFBIG;
207                 }
208         }
209         if (pos + count > inode->i_sb->s_maxbytes) {
210                 count = inode->i_sb->s_maxbytes - pos;
211         }
212         
213         if (!count)
214                 return 0;
215         errno = ncp_make_open(inode, O_WRONLY);
216         if (errno) {
217                 DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
218                 return errno;
219         }
220         bufsize = NCP_SERVER(inode)->buffer_size;
221
222         already_written = 0;
223
224         bouncebuffer = vmalloc(bufsize);
225         if (!bouncebuffer) {
226                 errno = -EIO;   /* -ENOMEM */
227                 goto outrel;
228         }
229         while (already_written < count) {
230                 int written_this_time;
231                 size_t to_write = min_t(unsigned int,
232                                       bufsize - (pos % bufsize),
233                                       count - already_written);
234
235                 if (copy_from_user(bouncebuffer, buf, to_write)) {
236                         errno = -EFAULT;
237                         break;
238                 }
239                 if (ncp_write_kernel(NCP_SERVER(inode), 
240                     NCP_FINFO(inode)->file_handle,
241                     pos, to_write, bouncebuffer, &written_this_time) != 0) {
242                         errno = -EIO;
243                         break;
244                 }
245                 pos += written_this_time;
246                 buf += written_this_time;
247                 already_written += written_this_time;
248
249                 if (written_this_time != to_write) {
250                         break;
251                 }
252         }
253         vfree(bouncebuffer);
254
255         file_update_time(file);
256
257         *ppos = pos;
258
259         if (pos > i_size_read(inode)) {
260                 mutex_lock(&inode->i_mutex);
261                 if (pos > i_size_read(inode))
262                         i_size_write(inode, pos);
263                 mutex_unlock(&inode->i_mutex);
264         }
265         DPRINTK("ncp_file_write: exit %s/%s\n",
266                 dentry->d_parent->d_name.name, dentry->d_name.name);
267 outrel:
268         ncp_inode_close(inode);         
269         return already_written ? already_written : errno;
270 }
271
272 static int ncp_release(struct inode *inode, struct file *file) {
273         if (ncp_make_closed(inode)) {
274                 DPRINTK("ncp_release: failed to close\n");
275         }
276         return 0;
277 }
278
279 const struct file_operations ncp_file_operations =
280 {
281         .llseek         = generic_file_llseek,
282         .read           = ncp_file_read,
283         .write          = ncp_file_write,
284         .unlocked_ioctl = ncp_ioctl,
285 #ifdef CONFIG_COMPAT
286         .compat_ioctl   = ncp_compat_ioctl,
287 #endif
288         .mmap           = ncp_mmap,
289         .release        = ncp_release,
290         .fsync          = ncp_fsync,
291 };
292
293 const struct inode_operations ncp_file_inode_operations =
294 {
295         .setattr        = ncp_notify_change,
296 };