[linux.git] / fs / ncpfs / file.c

/*
 *  file.c
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *
 */

#include <asm/uaccess.h>
#include <asm/system.h>

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/smp_lock.h>

#include <linux/ncp_fs.h>
#include "ncplib_kernel.h"

static int ncp_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	return 0;
}

/*
 * Open a file with the specified read/write mode.
 */
int ncp_make_open(struct inode *inode, int right)
{
	int error;
	int access;

	error = -EINVAL;
	if (!inode) {
		printk(KERN_ERR "ncp_make_open: got NULL inode\n");
		goto out;
	}

	DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
		atomic_read(&NCP_FINFO(inode)->opened), 
		NCP_FINFO(inode)->volNumber, 
		NCP_FINFO(inode)->dirEntNum);
	error = -EACCES;
	down(&NCP_FINFO(inode)->open_sem);
	if (!atomic_read(&NCP_FINFO(inode)->opened)) {
		struct ncp_entry_info finfo;
		int result;

		/* tries max. rights */
		finfo.access = O_RDWR;
		result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
					inode, NULL, OC_MODE_OPEN,
					0, AR_READ | AR_WRITE, &finfo);
		if (!result)
			goto update;
		/* RDWR did not succeeded, try readonly or writeonly as requested */
		switch (right) {
			case O_RDONLY:
				finfo.access = O_RDONLY;
				result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
					inode, NULL, OC_MODE_OPEN,
					0, AR_READ, &finfo);
				break;
			case O_WRONLY:
				finfo.access = O_WRONLY;
				result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
					inode, NULL, OC_MODE_OPEN,
					0, AR_WRITE, &finfo);
				break;
		}
		if (result) {
			PPRINTK("ncp_make_open: failed, result=%d\n", result);
			goto out_unlock;
		}
		/*
		 * Update the inode information.
		 */
	update:
		ncp_update_inode(inode, &finfo);
		atomic_set(&NCP_FINFO(inode)->opened, 1);
	}

	access = NCP_FINFO(inode)->access;
	PPRINTK("ncp_make_open: file open, access=%x\n", access);
	if (access == right || access == O_RDWR) {
		atomic_inc(&NCP_FINFO(inode)->opened);
		error = 0;
	}

out_unlock:
	up(&NCP_FINFO(inode)->open_sem);
out:
	return error;
}

static ssize_t
ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	struct dentry *dentry = file->f_dentry;
	struct inode *inode = dentry->d_inode;
	size_t already_read = 0;
	off_t pos;
	size_t bufsize;
	int error;
	void* freepage;
	size_t freelen;

	DPRINTK("ncp_file_read: enter %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);

	if (!ncp_conn_valid(NCP_SERVER(inode)))
		return -EIO;

	pos = *ppos;

	if ((ssize_t) count < 0) {
		return -EINVAL;
	}
	if (!count)
		return 0;
	if (pos > inode->i_sb->s_maxbytes)
		return 0;
	if (pos + count > inode->i_sb->s_maxbytes) {
		count = inode->i_sb->s_maxbytes - pos;
	}

	error = ncp_make_open(inode, O_RDONLY);
	if (error) {
		DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
		return error;
	}

	bufsize = NCP_SERVER(inode)->buffer_size;

	error = -EIO;
	freelen = ncp_read_bounce_size(bufsize);
	freepage = vmalloc(freelen);
	if (!freepage)
		goto outrel;
	error = 0;
	/* First read in as much as possible for each bufsize. */
	while (already_read < count) {
		int read_this_time;
		size_t to_read = min_t(unsigned int,
				     bufsize - (pos % bufsize),
				     count - already_read);

		error = ncp_read_bounce(NCP_SERVER(inode),
			 	NCP_FINFO(inode)->file_handle,
				pos, to_read, buf, &read_this_time, 
				freepage, freelen);
		if (error) {
			error = -EIO;	/* NW errno -> Linux errno */
			break;
		}
		pos += read_this_time;
		buf += read_this_time;
		already_read += read_this_time;

		if (read_this_time != to_read) {
			break;
		}
	}
	vfree(freepage);

	*ppos = pos;

	file_accessed(file);

	DPRINTK("ncp_file_read: exit %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);
outrel:
	ncp_inode_close(inode);		
	return already_read ? already_read : error;
}

static ssize_t
ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
	struct dentry *dentry = file->f_dentry;
	struct inode *inode = dentry->d_inode;
	size_t already_written = 0;
	off_t pos;
	size_t bufsize;
	int errno;
	void* bouncebuffer;

	DPRINTK("ncp_file_write: enter %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);
	if (!ncp_conn_valid(NCP_SERVER(inode)))
		return -EIO;
	if ((ssize_t) count < 0)
		return -EINVAL;
	pos = *ppos;
	if (file->f_flags & O_APPEND) {
		pos = inode->i_size;
	}

	if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
		if (pos >= MAX_NON_LFS) {
			send_sig(SIGXFSZ, current, 0);
			return -EFBIG;
		}
		if (count > MAX_NON_LFS - (u32)pos) {
			count = MAX_NON_LFS - (u32)pos;
		}
	}
	if (pos >= inode->i_sb->s_maxbytes) {
		if (count || pos > inode->i_sb->s_maxbytes) {
			send_sig(SIGXFSZ, current, 0);
			return -EFBIG;
		}
	}
	if (pos + count > inode->i_sb->s_maxbytes) {
		count = inode->i_sb->s_maxbytes - pos;
	}
	
	if (!count)
		return 0;
	errno = ncp_make_open(inode, O_WRONLY);
	if (errno) {
		DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
		return errno;
	}
	bufsize = NCP_SERVER(inode)->buffer_size;

	already_written = 0;

	bouncebuffer = vmalloc(bufsize);
	if (!bouncebuffer) {
		errno = -EIO;	/* -ENOMEM */
		goto outrel;
	}
	while (already_written < count) {
		int written_this_time;
		size_t to_write = min_t(unsigned int,
				      bufsize - (pos % bufsize),
				      count - already_written);

		if (copy_from_user(bouncebuffer, buf, to_write)) {
			errno = -EFAULT;
			break;
		}
		if (ncp_write_kernel(NCP_SERVER(inode), 
		    NCP_FINFO(inode)->file_handle,
		    pos, to_write, bouncebuffer, &written_this_time) != 0) {
			errno = -EIO;
			break;
		}
		pos += written_this_time;
		buf += written_this_time;
		already_written += written_this_time;

		if (written_this_time != to_write) {
			break;
		}
	}
	vfree(bouncebuffer);

	inode_update_time(inode, 1);

	*ppos = pos;

	if (pos > inode->i_size) {
		inode->i_size = pos;
	}
	DPRINTK("ncp_file_write: exit %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);
outrel:
	ncp_inode_close(inode);		
	return already_written ? already_written : errno;
}

static int ncp_release(struct inode *inode, struct file *file) {
	if (ncp_make_closed(inode)) {
		DPRINTK("ncp_release: failed to close\n");
	}
	return 0;
}

struct file_operations ncp_file_operations =
{
	.llseek		= remote_llseek,
	.read		= ncp_file_read,
	.write		= ncp_file_write,
	.ioctl		= ncp_ioctl,
	.mmap		= ncp_mmap,
	.release	= ncp_release,
	.fsync		= ncp_fsync,
};

struct inode_operations ncp_file_inode_operations =
{
	.setattr	= ncp_notify_change,
};
Commit	Line	Data
1da177e4 LT	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	down(&NCP_FINFO(inode)->open_sem);
	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	up(&NCP_FINFO(inode)->open_sem);
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	inode_update_time(inode, 1);
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	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	.mmap = ncp_mmap,
293	.release = ncp_release,
294	.fsync = ncp_fsync,
295	};
296
297	struct inode_operations ncp_file_inode_operations =
298	{
299	.setattr = ncp_notify_change,
300	};