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/sched.h>
21
22#include <linux/ncp_fs.h>
23#include "ncplib_kernel.h"
24
25static 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 */
33int 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
95out_unlock:
96	mutex_unlock(&NCP_FINFO(inode)->open_mutex);
97out:
98	return error;
99}
100
101static ssize_t
102ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
103{
104	struct dentry *dentry = file->f_path.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);
177outrel:
178	ncp_inode_close(inode);
179	return already_read ? already_read : error;
180}
181
182static ssize_t
183ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
184{
185	struct dentry *dentry = file->f_path.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);
274outrel:
275	ncp_inode_close(inode);
276	return already_written ? already_written : errno;
277}
278
279static 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
286const 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
300const struct inode_operations ncp_file_inode_operations =
301{
302	.setattr	= ncp_notify_change,
303};
304