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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
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
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
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
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
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;
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;
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};
263
