[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/vmalloc.h>
#include <linux/sched.h>

#include "ncp_fs.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>
1da177e4	20
32c419d9	21	#include "ncp_fs.h"
1da177e4	22
7ea80859	23	static int ncp_fsync(struct file *file, int datasync)
1da177e4 LT	24	{
	25	return 0;
	26	}
	27
	28	/*
	29	* Open a file with the specified read/write mode.
	30	*/
	31	int ncp_make_open(struct inode *inode, int right)
	32	{
	33	int error;
	34	int access;
	35
	36	error = -EINVAL;
	37	if (!inode) {
	38	printk(KERN_ERR "ncp_make_open: got NULL inode\n");
	39	goto out;
	40	}
	41
	42	DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
	43	atomic_read(&NCP_FINFO(inode)->opened),
	44	NCP_FINFO(inode)->volNumber,
	45	NCP_FINFO(inode)->dirEntNum);
	46	error = -EACCES;
8e3f9045	47	mutex_lock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	48	if (!atomic_read(&NCP_FINFO(inode)->opened)) {
	49	struct ncp_entry_info finfo;
	50	int result;
	51
	52	/* tries max. rights */
	53	finfo.access = O_RDWR;
	54	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	55	inode, NULL, OC_MODE_OPEN,
	56	0, AR_READ \| AR_WRITE, &finfo);
	57	if (!result)
	58	goto update;
	59	/* RDWR did not succeeded, try readonly or writeonly as requested */
	60	switch (right) {
	61	case O_RDONLY:
	62	finfo.access = O_RDONLY;
	63	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	64	inode, NULL, OC_MODE_OPEN,
	65	0, AR_READ, &finfo);
	66	break;
	67	case O_WRONLY:
	68	finfo.access = O_WRONLY;
	69	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	70	inode, NULL, OC_MODE_OPEN,
	71	0, AR_WRITE, &finfo);
	72	break;
	73	}
	74	if (result) {
	75	PPRINTK("ncp_make_open: failed, result=%d\n", result);
	76	goto out_unlock;
	77	}
	78	/*
	79	* Update the inode information.
	80	*/
	81	update:
	82	ncp_update_inode(inode, &finfo);
	83	atomic_set(&NCP_FINFO(inode)->opened, 1);
	84	}
	85
	86	access = NCP_FINFO(inode)->access;
	87	PPRINTK("ncp_make_open: file open, access=%x\n", access);
	88	if (access == right \|\| access == O_RDWR) {
	89	atomic_inc(&NCP_FINFO(inode)->opened);
	90	error = 0;
	91	}
	92
	93	out_unlock:
8e3f9045	94	mutex_unlock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	95	out:
	96	return error;
	97	}
	98
	99	static ssize_t
	100	ncp_file_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	101	{
92e5baef	102	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	103	struct inode *inode = dentry->d_inode;
	104	size_t already_read = 0;
	105	off_t pos;
	106	size_t bufsize;
	107	int error;
	108	void* freepage;
	109	size_t freelen;
	110
	111	DPRINTK("ncp_file_read: enter %s/%s\n",
	112	dentry->d_parent->d_name.name, dentry->d_name.name);
	113
1da177e4 LT	114	pos = *ppos;
	115
	116	if ((ssize_t) count < 0) {
	117	return -EINVAL;
	118	}
	119	if (!count)
	120	return 0;
	121	if (pos > inode->i_sb->s_maxbytes)
	122	return 0;
	123	if (pos + count > inode->i_sb->s_maxbytes) {
	124	count = inode->i_sb->s_maxbytes - pos;
	125	}
	126
	127	error = ncp_make_open(inode, O_RDONLY);
	128	if (error) {
	129	DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
	130	return error;
	131	}
	132
	133	bufsize = NCP_SERVER(inode)->buffer_size;
	134
	135	error = -EIO;
	136	freelen = ncp_read_bounce_size(bufsize);
	137	freepage = vmalloc(freelen);
	138	if (!freepage)
	139	goto outrel;
	140	error = 0;
	141	/* First read in as much as possible for each bufsize. */
	142	while (already_read < count) {
	143	int read_this_time;
	144	size_t to_read = min_t(unsigned int,
	145	bufsize - (pos % bufsize),
	146	count - already_read);
	147
	148	error = ncp_read_bounce(NCP_SERVER(inode),
	149	NCP_FINFO(inode)->file_handle,
	150	pos, to_read, buf, &read_this_time,
	151	freepage, freelen);
	152	if (error) {
	153	error = -EIO; /* NW errno -> Linux errno */
	154	break;
	155	}
	156	pos += read_this_time;
	157	buf += read_this_time;
	158	already_read += read_this_time;
	159
	160	if (read_this_time != to_read) {
	161	break;
	162	}
	163	}
	164	vfree(freepage);
	165
	166	*ppos = pos;
	167
	168	file_accessed(file);
	169
	170	DPRINTK("ncp_file_read: exit %s/%s\n",
	171	dentry->d_parent->d_name.name, dentry->d_name.name);
	172	outrel:
	173	ncp_inode_close(inode);
	174	return already_read ? already_read : error;
	175	}
	176
	177	static ssize_t
178	ncp_file_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
179	{
92e5baef	180	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	181	struct inode *inode = dentry->d_inode;
	182	size_t already_written = 0;
	183	off_t pos;
	184	size_t bufsize;
	185	int errno;
	186	void* bouncebuffer;
	187
	188	DPRINTK("ncp_file_write: enter %s/%s\n",
	189	dentry->d_parent->d_name.name, dentry->d_name.name);
1da177e4 LT	190	if ((ssize_t) count < 0)
	191	return -EINVAL;
	192	pos = *ppos;
	193	if (file->f_flags & O_APPEND) {
2e54eb96	194	pos = i_size_read(inode);
1da177e4 LT	195	}
	196
	197	if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
	198	if (pos >= MAX_NON_LFS) {
1da177e4 LT	199	return -EFBIG;
	200	}
	201	if (count > MAX_NON_LFS - (u32)pos) {
	202	count = MAX_NON_LFS - (u32)pos;
	203	}
	204	}
	205	if (pos >= inode->i_sb->s_maxbytes) {
	206	if (count \|\| pos > inode->i_sb->s_maxbytes) {
1da177e4 LT	207	return -EFBIG;
	208	}
	209	}
	210	if (pos + count > inode->i_sb->s_maxbytes) {
	211	count = inode->i_sb->s_maxbytes - pos;
	212	}
	213
	214	if (!count)
	215	return 0;
	216	errno = ncp_make_open(inode, O_WRONLY);
	217	if (errno) {
	218	DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
	219	return errno;
	220	}
	221	bufsize = NCP_SERVER(inode)->buffer_size;
	222
	223	already_written = 0;
	224
	225	bouncebuffer = vmalloc(bufsize);
	226	if (!bouncebuffer) {
	227	errno = -EIO; /* -ENOMEM */
	228	goto outrel;
	229	}
	230	while (already_written < count) {
	231	int written_this_time;
	232	size_t to_write = min_t(unsigned int,
	233	bufsize - (pos % bufsize),
	234	count - already_written);
	235
	236	if (copy_from_user(bouncebuffer, buf, to_write)) {
	237	errno = -EFAULT;
	238	break;
	239	}
	240	if (ncp_write_kernel(NCP_SERVER(inode),
	241	NCP_FINFO(inode)->file_handle,
	242	pos, to_write, bouncebuffer, &written_this_time) != 0) {
	243	errno = -EIO;
	244	break;
	245	}
	246	pos += written_this_time;
	247	buf += written_this_time;
	248	already_written += written_this_time;
	249
	250	if (written_this_time != to_write) {
	251	break;
	252	}
	253	}
	254	vfree(bouncebuffer);
	255
870f4817	256	file_update_time(file);
1da177e4 LT	257
	258	*ppos = pos;
	259
2e54eb96 PV	260	if (pos > i_size_read(inode)) {
	261	mutex_lock(&inode->i_mutex);
	262	if (pos > i_size_read(inode))
	263	i_size_write(inode, pos);
	264	mutex_unlock(&inode->i_mutex);
1da177e4 LT	265	}
	266	DPRINTK("ncp_file_write: exit %s/%s\n",
	267	dentry->d_parent->d_name.name, dentry->d_name.name);
	268	outrel:
	269	ncp_inode_close(inode);
	270	return already_written ? already_written : errno;
	271	}
	272
	273	static int ncp_release(struct inode inode, struct file file) {
	274	if (ncp_make_closed(inode)) {
	275	DPRINTK("ncp_release: failed to close\n");
	276	}
	277	return 0;
	278	}
	279
4b6f5d20	280	const struct file_operations ncp_file_operations =
1da177e4	281	{
2e54eb96	282	.llseek = generic_file_llseek,
1da177e4 LT	283	.read = ncp_file_read,
1da177e4 LT	284	.write = ncp_file_write,
93d84b6d	285	.unlocked_ioctl = ncp_ioctl,
54f67f63 PV	286	#ifdef CONFIG_COMPAT
	287	.compat_ioctl = ncp_compat_ioctl,
	288	#endif
1da177e4 LT	289	.mmap = ncp_mmap,
	290	.release = ncp_release,
	291	.fsync = ncp_fsync,
	292	};
	293
92e1d5be	294	const struct inode_operations ncp_file_inode_operations =
1da177e4 LT	295	{
	296	.setattr = ncp_notify_change,
	297	};