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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <asm/uaccess.h>
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>
19#include <linux/vmalloc.h>
20#include <linux/sched.h>
21
22#include "ncp_fs.h"
23
24static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync)
25{
26 return filemap_write_and_wait_range(file->f_mapping, start, end);
27}
28
29/*
30 * Open a file with the specified read/write mode.
31 */
32int ncp_make_open(struct inode *inode, int right)
33{
34 int error;
35 int access;
36
37 error = -EINVAL;
38 if (!inode) {
39 pr_err("%s: got NULL inode\n", __func__);
40 goto out;
41 }
42
43 ncp_dbg(1, "opened=%d, volume # %u, dir entry # %u\n",
44 atomic_read(&NCP_FINFO(inode)->opened),
45 NCP_FINFO(inode)->volNumber,
46 NCP_FINFO(inode)->dirEntNum);
47 error = -EACCES;
48 mutex_lock(&NCP_FINFO(inode)->open_mutex);
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) {
76 ncp_vdbg("failed, result=%d\n", result);
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;
88 ncp_vdbg("file open, access=%x\n", access);
89 if (access == right || access == O_RDWR) {
90 atomic_inc(&NCP_FINFO(inode)->opened);
91 error = 0;
92 }
93
94out_unlock:
95 mutex_unlock(&NCP_FINFO(inode)->open_mutex);
96out:
97 return error;
98}
99
100static ssize_t
101ncp_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
102{
103 struct file *file = iocb->ki_filp;
104 struct inode *inode = file_inode(file);
105 size_t already_read = 0;
106 off_t pos = iocb->ki_pos;
107 size_t bufsize;
108 int error;
109 void *freepage;
110 size_t freelen;
111
112 ncp_dbg(1, "enter %pD2\n", file);
113
114 if (!iov_iter_count(to))
115 return 0;
116 if (pos > inode->i_sb->s_maxbytes)
117 return 0;
118 iov_iter_truncate(to, inode->i_sb->s_maxbytes - pos);
119
120 error = ncp_make_open(inode, O_RDONLY);
121 if (error) {
122 ncp_dbg(1, "open failed, error=%d\n", error);
123 return error;
124 }
125
126 bufsize = NCP_SERVER(inode)->buffer_size;
127
128 error = -EIO;
129 freelen = ncp_read_bounce_size(bufsize);
130 freepage = vmalloc(freelen);
131 if (!freepage)
132 goto outrel;
133 error = 0;
134 /* First read in as much as possible for each bufsize. */
135 while (iov_iter_count(to)) {
136 int read_this_time;
137 size_t to_read = min_t(size_t,
138 bufsize - (pos % bufsize),
139 iov_iter_count(to));
140
141 error = ncp_read_bounce(NCP_SERVER(inode),
142 NCP_FINFO(inode)->file_handle,
143 pos, to_read, to, &read_this_time,
144 freepage, freelen);
145 if (error) {
146 error = -EIO; /* NW errno -> Linux errno */
147 break;
148 }
149 pos += read_this_time;
150 already_read += read_this_time;
151
152 if (read_this_time != to_read)
153 break;
154 }
155 vfree(freepage);
156
157 iocb->ki_pos = pos;
158
159 file_accessed(file);
160
161 ncp_dbg(1, "exit %pD2\n", file);
162outrel:
163 ncp_inode_close(inode);
164 return already_read ? already_read : error;
165}
166
167static ssize_t
168ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
169{
170 struct file *file = iocb->ki_filp;
171 struct inode *inode = file_inode(file);
172 size_t already_written = 0;
173 size_t bufsize;
174 int errno;
175 void *bouncebuffer;
176 off_t pos;
177
178 ncp_dbg(1, "enter %pD2\n", file);
179 errno = generic_write_checks(iocb, from);
180 if (errno <= 0)
181 return errno;
182
183 errno = ncp_make_open(inode, O_WRONLY);
184 if (errno) {
185 ncp_dbg(1, "open failed, error=%d\n", errno);
186 return errno;
187 }
188 bufsize = NCP_SERVER(inode)->buffer_size;
189
190 errno = file_update_time(file);
191 if (errno)
192 goto outrel;
193
194 bouncebuffer = vmalloc(bufsize);
195 if (!bouncebuffer) {
196 errno = -EIO; /* -ENOMEM */
197 goto outrel;
198 }
199 pos = iocb->ki_pos;
200 while (iov_iter_count(from)) {
201 int written_this_time;
202 size_t to_write = min_t(size_t,
203 bufsize - (pos % bufsize),
204 iov_iter_count(from));
205
206 if (copy_from_iter(bouncebuffer, to_write, from) != to_write) {
207 errno = -EFAULT;
208 break;
209 }
210 if (ncp_write_kernel(NCP_SERVER(inode),
211 NCP_FINFO(inode)->file_handle,
212 pos, to_write, bouncebuffer, &written_this_time) != 0) {
213 errno = -EIO;
214 break;
215 }
216 pos += written_this_time;
217 already_written += written_this_time;
218
219 if (written_this_time != to_write)
220 break;
221 }
222 vfree(bouncebuffer);
223
224 iocb->ki_pos = pos;
225
226 if (pos > i_size_read(inode)) {
227 inode_lock(inode);
228 if (pos > i_size_read(inode))
229 i_size_write(inode, pos);
230 inode_unlock(inode);
231 }
232 ncp_dbg(1, "exit %pD2\n", file);
233outrel:
234 ncp_inode_close(inode);
235 return already_written ? already_written : errno;
236}
237
238static int ncp_release(struct inode *inode, struct file *file) {
239 if (ncp_make_closed(inode)) {
240 ncp_dbg(1, "failed to close\n");
241 }
242 return 0;
243}
244
245const struct file_operations ncp_file_operations =
246{
247 .llseek = generic_file_llseek,
248 .read_iter = ncp_file_read_iter,
249 .write_iter = ncp_file_write_iter,
250 .unlocked_ioctl = ncp_ioctl,
251#ifdef CONFIG_COMPAT
252 .compat_ioctl = ncp_compat_ioctl,
253#endif
254 .mmap = ncp_mmap,
255 .release = ncp_release,
256 .fsync = ncp_fsync,
257};
258
259const struct inode_operations ncp_file_inode_operations =
260{
261 .setattr = ncp_notify_change,
262};
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
22static 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 */
30int 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
92out_unlock:
93 mutex_unlock(&NCP_FINFO(inode)->open_mutex);
94out:
95 return error;
96}
97
98static ssize_t
99ncp_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);
171outrel:
172 ncp_inode_close(inode);
173 return already_read ? already_read : error;
174}
175
176static ssize_t
177ncp_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 errno = file_update_time(file);
225 if (errno)
226 goto outrel;
227
228 bouncebuffer = vmalloc(bufsize);
229 if (!bouncebuffer) {
230 errno = -EIO; /* -ENOMEM */
231 goto outrel;
232 }
233 while (already_written < count) {
234 int written_this_time;
235 size_t to_write = min_t(unsigned int,
236 bufsize - (pos % bufsize),
237 count - already_written);
238
239 if (copy_from_user(bouncebuffer, buf, to_write)) {
240 errno = -EFAULT;
241 break;
242 }
243 if (ncp_write_kernel(NCP_SERVER(inode),
244 NCP_FINFO(inode)->file_handle,
245 pos, to_write, bouncebuffer, &written_this_time) != 0) {
246 errno = -EIO;
247 break;
248 }
249 pos += written_this_time;
250 buf += written_this_time;
251 already_written += written_this_time;
252
253 if (written_this_time != to_write) {
254 break;
255 }
256 }
257 vfree(bouncebuffer);
258
259 *ppos = pos;
260
261 if (pos > i_size_read(inode)) {
262 mutex_lock(&inode->i_mutex);
263 if (pos > i_size_read(inode))
264 i_size_write(inode, pos);
265 mutex_unlock(&inode->i_mutex);
266 }
267 DPRINTK("ncp_file_write: exit %s/%s\n",
268 dentry->d_parent->d_name.name, dentry->d_name.name);
269outrel:
270 ncp_inode_close(inode);
271 return already_written ? already_written : errno;
272}
273
274static int ncp_release(struct inode *inode, struct file *file) {
275 if (ncp_make_closed(inode)) {
276 DPRINTK("ncp_release: failed to close\n");
277 }
278 return 0;
279}
280
281const struct file_operations ncp_file_operations =
282{
283 .llseek = generic_file_llseek,
284 .read = ncp_file_read,
285 .write = ncp_file_write,
286 .unlocked_ioctl = ncp_ioctl,
287#ifdef CONFIG_COMPAT
288 .compat_ioctl = ncp_compat_ioctl,
289#endif
290 .mmap = ncp_mmap,
291 .release = ncp_release,
292 .fsync = ncp_fsync,
293};
294
295const struct inode_operations ncp_file_inode_operations =
296{
297 .setattr = ncp_notify_change,
298};