[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 <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, loff_t start, loff_t end, int datasync)
{
	return filemap_write_and_wait_range(file->f_mapping, start, end);
}

/*
 * 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;

	errno = file_update_time(file);
	if (errno)
		goto outrel;

	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);

	*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>
1da177e4 LT	10
	11	#include <linux/time.h>
	12	#include <linux/kernel.h>
	13	#include <linux/errno.h>
	14	#include <linux/fcntl.h>
	15	#include <linux/stat.h>
	16	#include <linux/mm.h>
1da177e4	17	#include <linux/vmalloc.h>
e8edc6e0	18	#include <linux/sched.h>
1da177e4	19
32c419d9	20	#include "ncp_fs.h"
1da177e4	21
02c24a82	22	static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1da177e4	23	{
02c24a82	24	return filemap_write_and_wait_range(file->f_mapping, start, end);
1da177e4 LT	25	}
	26
	27	/*
	28	* Open a file with the specified read/write mode.
	29	*/
	30	int ncp_make_open(struct inode *inode, int right)
	31	{
	32	int error;
	33	int access;
	34
	35	error = -EINVAL;
	36	if (!inode) {
	37	printk(KERN_ERR "ncp_make_open: got NULL inode\n");
	38	goto out;
	39	}
	40
	41	DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
	42	atomic_read(&NCP_FINFO(inode)->opened),
	43	NCP_FINFO(inode)->volNumber,
	44	NCP_FINFO(inode)->dirEntNum);
	45	error = -EACCES;
8e3f9045	46	mutex_lock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	47	if (!atomic_read(&NCP_FINFO(inode)->opened)) {
	48	struct ncp_entry_info finfo;
	49	int result;
	50
	51	/* tries max. rights */
	52	finfo.access = O_RDWR;
	53	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	54	inode, NULL, OC_MODE_OPEN,
	55	0, AR_READ \| AR_WRITE, &finfo);
	56	if (!result)
	57	goto update;
	58	/* RDWR did not succeeded, try readonly or writeonly as requested */
	59	switch (right) {
	60	case O_RDONLY:
	61	finfo.access = O_RDONLY;
	62	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	63	inode, NULL, OC_MODE_OPEN,
	64	0, AR_READ, &finfo);
	65	break;
	66	case O_WRONLY:
	67	finfo.access = O_WRONLY;
	68	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	69	inode, NULL, OC_MODE_OPEN,
	70	0, AR_WRITE, &finfo);
	71	break;
	72	}
	73	if (result) {
	74	PPRINTK("ncp_make_open: failed, result=%d\n", result);
	75	goto out_unlock;
	76	}
	77	/*
	78	* Update the inode information.
	79	*/
	80	update:
	81	ncp_update_inode(inode, &finfo);
	82	atomic_set(&NCP_FINFO(inode)->opened, 1);
	83	}
	84
	85	access = NCP_FINFO(inode)->access;
	86	PPRINTK("ncp_make_open: file open, access=%x\n", access);
	87	if (access == right \|\| access == O_RDWR) {
	88	atomic_inc(&NCP_FINFO(inode)->opened);
	89	error = 0;
	90	}
	91
	92	out_unlock:
8e3f9045	93	mutex_unlock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	94	out:
	95	return error;
	96	}
	97
	98	static ssize_t
	99	ncp_file_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	100	{
92e5baef	101	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	102	struct inode *inode = dentry->d_inode;
	103	size_t already_read = 0;
	104	off_t pos;
	105	size_t bufsize;
	106	int error;
	107	void* freepage;
	108	size_t freelen;
	109
	110	DPRINTK("ncp_file_read: enter %s/%s\n",
	111	dentry->d_parent->d_name.name, dentry->d_name.name);
	112
1da177e4 LT	113	pos = *ppos;
	114
	115	if ((ssize_t) count < 0) {
	116	return -EINVAL;
	117	}
	118	if (!count)
	119	return 0;
	120	if (pos > inode->i_sb->s_maxbytes)
	121	return 0;
	122	if (pos + count > inode->i_sb->s_maxbytes) {
	123	count = inode->i_sb->s_maxbytes - pos;
	124	}
	125
	126	error = ncp_make_open(inode, O_RDONLY);
	127	if (error) {
	128	DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
	129	return error;
	130	}
	131
	132	bufsize = NCP_SERVER(inode)->buffer_size;
	133
	134	error = -EIO;
	135	freelen = ncp_read_bounce_size(bufsize);
	136	freepage = vmalloc(freelen);
	137	if (!freepage)
	138	goto outrel;
	139	error = 0;
	140	/* First read in as much as possible for each bufsize. */
	141	while (already_read < count) {
	142	int read_this_time;
	143	size_t to_read = min_t(unsigned int,
	144	bufsize - (pos % bufsize),
	145	count - already_read);
	146
	147	error = ncp_read_bounce(NCP_SERVER(inode),
	148	NCP_FINFO(inode)->file_handle,
	149	pos, to_read, buf, &read_this_time,
	150	freepage, freelen);
	151	if (error) {
	152	error = -EIO; /* NW errno -> Linux errno */
	153	break;
	154	}
	155	pos += read_this_time;
	156	buf += read_this_time;
	157	already_read += read_this_time;
	158
	159	if (read_this_time != to_read) {
	160	break;
	161	}
	162	}
	163	vfree(freepage);
	164
	165	*ppos = pos;
	166
	167	file_accessed(file);
	168
	169	DPRINTK("ncp_file_read: exit %s/%s\n",
	170	dentry->d_parent->d_name.name, dentry->d_name.name);
	171	outrel:
	172	ncp_inode_close(inode);
	173	return already_read ? already_read : error;
	174	}
	175
	176	static ssize_t
177	ncp_file_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
178	{
92e5baef	179	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	180	struct inode *inode = dentry->d_inode;
	181	size_t already_written = 0;
	182	off_t pos;
	183	size_t bufsize;
	184	int errno;
	185	void* bouncebuffer;
	186
	187	DPRINTK("ncp_file_write: enter %s/%s\n",
	188	dentry->d_parent->d_name.name, dentry->d_name.name);
1da177e4 LT	189	if ((ssize_t) count < 0)
	190	return -EINVAL;
	191	pos = *ppos;
	192	if (file->f_flags & O_APPEND) {
2e54eb96	193	pos = i_size_read(inode);
1da177e4 LT	194	}
	195
	196	if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
	197	if (pos >= MAX_NON_LFS) {
1da177e4 LT	198	return -EFBIG;
	199	}
	200	if (count > MAX_NON_LFS - (u32)pos) {
	201	count = MAX_NON_LFS - (u32)pos;
	202	}
	203	}
	204	if (pos >= inode->i_sb->s_maxbytes) {
	205	if (count \|\| pos > inode->i_sb->s_maxbytes) {
1da177e4 LT	206	return -EFBIG;
	207	}
	208	}
	209	if (pos + count > inode->i_sb->s_maxbytes) {
	210	count = inode->i_sb->s_maxbytes - pos;
	211	}
	212
	213	if (!count)
	214	return 0;
	215	errno = ncp_make_open(inode, O_WRONLY);
	216	if (errno) {
	217	DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
	218	return errno;
	219	}
	220	bufsize = NCP_SERVER(inode)->buffer_size;
	221
	222	already_written = 0;
	223
c3b2da31 JB	224	errno = file_update_time(file);
	225	if (errno)
	226	goto outrel;
	227
1da177e4 LT	228	bouncebuffer = vmalloc(bufsize);
	229	if (!bouncebuffer) {
	230	errno = -EIO; /* -ENOMEM */
	231	goto outrel;
	232	}
	233	while (already_written < count) {
	234	int written_this_time;
	235	size_t to_write = min_t(unsigned int,
	236	bufsize - (pos % bufsize),
	237	count - already_written);
	238
	239	if (copy_from_user(bouncebuffer, buf, to_write)) {
	240	errno = -EFAULT;
	241	break;
	242	}
	243	if (ncp_write_kernel(NCP_SERVER(inode),
	244	NCP_FINFO(inode)->file_handle,
	245	pos, to_write, bouncebuffer, &written_this_time) != 0) {
	246	errno = -EIO;
	247	break;
	248	}
	249	pos += written_this_time;
	250	buf += written_this_time;
	251	already_written += written_this_time;
	252
	253	if (written_this_time != to_write) {
	254	break;
	255	}
	256	}
	257	vfree(bouncebuffer);
	258
1da177e4 LT	259	*ppos = pos;
1da177e4 LT	260
2e54eb96 PV	261	if (pos > i_size_read(inode)) {
	262	mutex_lock(&inode->i_mutex);
	263	if (pos > i_size_read(inode))
	264	i_size_write(inode, pos);
	265	mutex_unlock(&inode->i_mutex);
1da177e4 LT	266	}
	267	DPRINTK("ncp_file_write: exit %s/%s\n",
	268	dentry->d_parent->d_name.name, dentry->d_name.name);
	269	outrel:
	270	ncp_inode_close(inode);
	271	return already_written ? already_written : errno;
	272	}
	273
	274	static int ncp_release(struct inode inode, struct file file) {
	275	if (ncp_make_closed(inode)) {
	276	DPRINTK("ncp_release: failed to close\n");
	277	}
	278	return 0;
	279	}
	280
4b6f5d20	281	const struct file_operations ncp_file_operations =
1da177e4	282	{
2e54eb96	283	.llseek = generic_file_llseek,
1da177e4 LT	284	.read = ncp_file_read,
1da177e4 LT	285	.write = ncp_file_write,
93d84b6d	286	.unlocked_ioctl = ncp_ioctl,
54f67f63 PV	287	#ifdef CONFIG_COMPAT
	288	.compat_ioctl = ncp_compat_ioctl,
	289	#endif
1da177e4 LT	290	.mmap = ncp_mmap,
	291	.release = ncp_release,
	292	.fsync = ncp_fsync,
	293	};
	294
92e1d5be	295	const struct inode_operations ncp_file_inode_operations =
1da177e4 LT	296	{
	297	.setattr = ncp_notify_change,
	298	};