[net-next-2.6.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/vmalloc.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>

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

static int ncp_fsync(struct file *file, 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;
	mutex_lock(&NCP_FINFO(inode)->open_mutex);
	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:
	mutex_unlock(&NCP_FINFO(inode)->open_mutex);
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_path.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);

	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_path.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 ((ssize_t) count < 0)
		return -EINVAL;
	pos = *ppos;
	if (file->f_flags & O_APPEND) {
		pos = i_size_read(inode);
	}

	if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
		if (pos >= MAX_NON_LFS) {
			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) {
			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);

	file_update_time(file);

	*ppos = pos;

	if (pos > i_size_read(inode)) {
		mutex_lock(&inode->i_mutex);
		if (pos > i_size_read(inode))
			i_size_write(inode, pos);
		mutex_unlock(&inode->i_mutex);
	}
	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;
}

const struct file_operations ncp_file_operations =
{
	.llseek		= generic_file_llseek,
	.read		= ncp_file_read,
	.write		= ncp_file_write,
	.unlocked_ioctl	= ncp_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ncp_compat_ioctl,
#endif
	.mmap		= ncp_mmap,
	.release	= ncp_release,
	.fsync		= ncp_fsync,
};

const 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>
1da177e4	18	#include <linux/vmalloc.h>
e8edc6e0	19	#include <linux/sched.h>
9465efc9	20	#include <linux/smp_lock.h>
1da177e4 LT	21
	22	#include <linux/ncp_fs.h>
	23	#include "ncplib_kernel.h"
	24
7ea80859	25	static int ncp_fsync(struct file *file, int datasync)
1da177e4 LT	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;
8e3f9045	49	mutex_lock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	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:
8e3f9045	96	mutex_unlock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	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	{
92e5baef	104	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	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
1da177e4 LT	116	pos = *ppos;
	117
	118	if ((ssize_t) count < 0) {
	119	return -EINVAL;
	120	}
	121	if (!count)
	122	return 0;
	123	if (pos > inode->i_sb->s_maxbytes)
	124	return 0;
	125	if (pos + count > inode->i_sb->s_maxbytes) {
	126	count = inode->i_sb->s_maxbytes - pos;
	127	}
	128
	129	error = ncp_make_open(inode, O_RDONLY);
	130	if (error) {
	131	DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
	132	return error;
	133	}
	134
	135	bufsize = NCP_SERVER(inode)->buffer_size;
	136
	137	error = -EIO;
	138	freelen = ncp_read_bounce_size(bufsize);
	139	freepage = vmalloc(freelen);
	140	if (!freepage)
	141	goto outrel;
	142	error = 0;
	143	/* First read in as much as possible for each bufsize. */
	144	while (already_read < count) {
	145	int read_this_time;
	146	size_t to_read = min_t(unsigned int,
	147	bufsize - (pos % bufsize),
	148	count - already_read);
	149
	150	error = ncp_read_bounce(NCP_SERVER(inode),
	151	NCP_FINFO(inode)->file_handle,
	152	pos, to_read, buf, &read_this_time,
	153	freepage, freelen);
	154	if (error) {
	155	error = -EIO; /* NW errno -> Linux errno */
	156	break;
	157	}
	158	pos += read_this_time;
	159	buf += read_this_time;
	160	already_read += read_this_time;
	161
	162	if (read_this_time != to_read) {
	163	break;
	164	}
	165	}
	166	vfree(freepage);
	167
	168	*ppos = pos;
	169
	170	file_accessed(file);
	171
	172	DPRINTK("ncp_file_read: exit %s/%s\n",
	173	dentry->d_parent->d_name.name, dentry->d_name.name);
	174	outrel:
	175	ncp_inode_close(inode);
	176	return already_read ? already_read : error;
	177	}
	178
	179	static ssize_t
180	ncp_file_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
181	{
92e5baef	182	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	183	struct inode *inode = dentry->d_inode;
	184	size_t already_written = 0;
	185	off_t pos;
	186	size_t bufsize;
	187	int errno;
	188	void* bouncebuffer;
	189
	190	DPRINTK("ncp_file_write: enter %s/%s\n",
	191	dentry->d_parent->d_name.name, dentry->d_name.name);
1da177e4 LT	192	if ((ssize_t) count < 0)
	193	return -EINVAL;
	194	pos = *ppos;
	195	if (file->f_flags & O_APPEND) {
2e54eb96	196	pos = i_size_read(inode);
1da177e4 LT	197	}
	198
	199	if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
	200	if (pos >= MAX_NON_LFS) {
1da177e4 LT	201	return -EFBIG;
	202	}
	203	if (count > MAX_NON_LFS - (u32)pos) {
	204	count = MAX_NON_LFS - (u32)pos;
	205	}
	206	}
	207	if (pos >= inode->i_sb->s_maxbytes) {
	208	if (count \|\| pos > inode->i_sb->s_maxbytes) {
1da177e4 LT	209	return -EFBIG;
	210	}
	211	}
	212	if (pos + count > inode->i_sb->s_maxbytes) {
	213	count = inode->i_sb->s_maxbytes - pos;
	214	}
	215
	216	if (!count)
	217	return 0;
	218	errno = ncp_make_open(inode, O_WRONLY);
	219	if (errno) {
	220	DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
	221	return errno;
	222	}
	223	bufsize = NCP_SERVER(inode)->buffer_size;
	224
	225	already_written = 0;
	226
	227	bouncebuffer = vmalloc(bufsize);
	228	if (!bouncebuffer) {
	229	errno = -EIO; /* -ENOMEM */
	230	goto outrel;
	231	}
	232	while (already_written < count) {
	233	int written_this_time;
	234	size_t to_write = min_t(unsigned int,
	235	bufsize - (pos % bufsize),
	236	count - already_written);
	237
	238	if (copy_from_user(bouncebuffer, buf, to_write)) {
	239	errno = -EFAULT;
	240	break;
	241	}
	242	if (ncp_write_kernel(NCP_SERVER(inode),
	243	NCP_FINFO(inode)->file_handle,
	244	pos, to_write, bouncebuffer, &written_this_time) != 0) {
	245	errno = -EIO;
	246	break;
	247	}
	248	pos += written_this_time;
	249	buf += written_this_time;
	250	already_written += written_this_time;
	251
	252	if (written_this_time != to_write) {
	253	break;
	254	}
	255	}
	256	vfree(bouncebuffer);
	257
870f4817	258	file_update_time(file);
1da177e4 LT	259
	260	*ppos = pos;
	261
2e54eb96 PV	262	if (pos > i_size_read(inode)) {
	263	mutex_lock(&inode->i_mutex);
	264	if (pos > i_size_read(inode))
	265	i_size_write(inode, pos);
	266	mutex_unlock(&inode->i_mutex);
1da177e4 LT	267	}
	268	DPRINTK("ncp_file_write: exit %s/%s\n",
	269	dentry->d_parent->d_name.name, dentry->d_name.name);
	270	outrel:
	271	ncp_inode_close(inode);
	272	return already_written ? already_written : errno;
	273	}
	274
	275	static int ncp_release(struct inode inode, struct file file) {
	276	if (ncp_make_closed(inode)) {
	277	DPRINTK("ncp_release: failed to close\n");
	278	}
	279	return 0;
	280	}
	281
4b6f5d20	282	const struct file_operations ncp_file_operations =
1da177e4	283	{
2e54eb96	284	.llseek = generic_file_llseek,
1da177e4 LT	285	.read = ncp_file_read,
1da177e4 LT	286	.write = ncp_file_write,
93d84b6d	287	.unlocked_ioctl = ncp_ioctl,
54f67f63 PV	288	#ifdef CONFIG_COMPAT
	289	.compat_ioctl = ncp_compat_ioctl,
	290	#endif
1da177e4 LT	291	.mmap = ncp_mmap,
	292	.release = ncp_release,
	293	.fsync = ncp_fsync,
	294	};
	295
92e1d5be	296	const struct inode_operations ncp_file_inode_operations =
1da177e4 LT	297	{
	298	.setattr = ncp_notify_change,
	299	};