[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
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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) {
		pr_err("%s: got NULL inode\n", __func__);
		goto out;
	}

	ncp_dbg(1, "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) {
			ncp_vdbg("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;
	ncp_vdbg("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;

	ncp_dbg(1, "enter %pd2\n", dentry);

	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) {
		ncp_dbg(1, "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);

	ncp_dbg(1, "exit %pd2\n", dentry);
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;

	ncp_dbg(1, "enter %pd2\n", dentry);
	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) {
		ncp_dbg(1, "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);
	}
	ncp_dbg(1, "exit %pd2\n", dentry);
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)) {
		ncp_dbg(1, "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
b41f8b84 JP	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
b41f8b84 JP	10
1da177e4	11	#include <asm/uaccess.h>
1da177e4 LT	12
	13	#include <linux/time.h>
	14	#include <linux/kernel.h>
	15	#include <linux/errno.h>
	16	#include <linux/fcntl.h>
	17	#include <linux/stat.h>
	18	#include <linux/mm.h>
1da177e4	19	#include <linux/vmalloc.h>
e8edc6e0	20	#include <linux/sched.h>
1da177e4	21
32c419d9	22	#include "ncp_fs.h"
1da177e4	23
02c24a82	24	static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1da177e4	25	{
02c24a82	26	return filemap_write_and_wait_range(file->f_mapping, start, end);
1da177e4 LT	27	}
	28
	29	/*
	30	* Open a file with the specified read/write mode.
	31	*/
	32	int ncp_make_open(struct inode *inode, int right)
	33	{
	34	int error;
	35	int access;
	36
	37	error = -EINVAL;
	38	if (!inode) {
b41f8b84	39	pr_err("%s: got NULL inode\n", __func__);
1da177e4 LT	40	goto out;
	41	}
	42
d3b73ca1	43	ncp_dbg(1, "opened=%d, volume # %u, dir entry # %u\n",
1da177e4 LT	44	atomic_read(&NCP_FINFO(inode)->opened),
	45	NCP_FINFO(inode)->volNumber,
	46	NCP_FINFO(inode)->dirEntNum);
	47	error = -EACCES;
8e3f9045	48	mutex_lock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	49	if (!atomic_read(&NCP_FINFO(inode)->opened)) {
	50	struct ncp_entry_info finfo;
	51	int result;
	52
	53	/* tries max. rights */
	54	finfo.access = O_RDWR;
	55	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	56	inode, NULL, OC_MODE_OPEN,
	57	0, AR_READ \| AR_WRITE, &finfo);
	58	if (!result)
	59	goto update;
	60	/* RDWR did not succeeded, try readonly or writeonly as requested */
	61	switch (right) {
	62	case O_RDONLY:
	63	finfo.access = O_RDONLY;
	64	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	65	inode, NULL, OC_MODE_OPEN,
	66	0, AR_READ, &finfo);
	67	break;
	68	case O_WRONLY:
	69	finfo.access = O_WRONLY;
	70	result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
	71	inode, NULL, OC_MODE_OPEN,
	72	0, AR_WRITE, &finfo);
	73	break;
	74	}
	75	if (result) {
e45ca8ba	76	ncp_vdbg("failed, result=%d\n", result);
1da177e4 LT	77	goto out_unlock;
	78	}
	79	/*
	80	* Update the inode information.
	81	*/
	82	update:
	83	ncp_update_inode(inode, &finfo);
	84	atomic_set(&NCP_FINFO(inode)->opened, 1);
	85	}
	86
	87	access = NCP_FINFO(inode)->access;
e45ca8ba	88	ncp_vdbg("file open, access=%x\n", access);
1da177e4 LT	89	if (access == right \|\| access == O_RDWR) {
	90	atomic_inc(&NCP_FINFO(inode)->opened);
	91	error = 0;
	92	}
	93
	94	out_unlock:
8e3f9045	95	mutex_unlock(&NCP_FINFO(inode)->open_mutex);
1da177e4 LT	96	out:
	97	return error;
	98	}
	99
	100	static ssize_t
	101	ncp_file_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	102	{
92e5baef	103	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	104	struct inode *inode = dentry->d_inode;
	105	size_t already_read = 0;
	106	off_t pos;
	107	size_t bufsize;
	108	int error;
	109	void* freepage;
	110	size_t freelen;
	111
d3b73ca1	112	ncp_dbg(1, "enter %pd2\n", dentry);
1da177e4	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) {
d3b73ca1	129	ncp_dbg(1, "open failed, error=%d\n", error);
1da177e4 LT	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
d3b73ca1	170	ncp_dbg(1, "exit %pd2\n", dentry);
1da177e4 LT	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
d3b73ca1	187	ncp_dbg(1, "enter %pd2\n", dentry);
1da177e4 LT	188	if ((ssize_t) count < 0)
	189	return -EINVAL;
	190	pos = *ppos;
	191	if (file->f_flags & O_APPEND) {
2e54eb96	192	pos = i_size_read(inode);
1da177e4 LT	193	}
	194
	195	if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
	196	if (pos >= MAX_NON_LFS) {
1da177e4 LT	197	return -EFBIG;
	198	}
	199	if (count > MAX_NON_LFS - (u32)pos) {
	200	count = MAX_NON_LFS - (u32)pos;
	201	}
	202	}
	203	if (pos >= inode->i_sb->s_maxbytes) {
	204	if (count \|\| pos > inode->i_sb->s_maxbytes) {
1da177e4 LT	205	return -EFBIG;
	206	}
	207	}
	208	if (pos + count > inode->i_sb->s_maxbytes) {
	209	count = inode->i_sb->s_maxbytes - pos;
	210	}
	211
	212	if (!count)
	213	return 0;
	214	errno = ncp_make_open(inode, O_WRONLY);
	215	if (errno) {
d3b73ca1	216	ncp_dbg(1, "open failed, error=%d\n", errno);
1da177e4 LT	217	return errno;
	218	}
	219	bufsize = NCP_SERVER(inode)->buffer_size;
	220
	221	already_written = 0;
	222
c3b2da31 JB	223	errno = file_update_time(file);
	224	if (errno)
	225	goto outrel;
	226
1da177e4 LT	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
1da177e4 LT	258	*ppos = pos;
1da177e4 LT	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	265	}
d3b73ca1	266	ncp_dbg(1, "exit %pd2\n", dentry);
1da177e4 LT	267	outrel:
	268	ncp_inode_close(inode);
	269	return already_written ? already_written : errno;
	270	}
	271
	272	static int ncp_release(struct inode inode, struct file file) {
	273	if (ncp_make_closed(inode)) {
d3b73ca1	274	ncp_dbg(1, "failed to close\n");
1da177e4 LT	275	}
	276	return 0;
	277	}
	278
4b6f5d20	279	const struct file_operations ncp_file_operations =
1da177e4	280	{
2e54eb96	281	.llseek = generic_file_llseek,
1da177e4 LT	282	.read = ncp_file_read,
1da177e4 LT	283	.write = ncp_file_write,
93d84b6d	284	.unlocked_ioctl = ncp_ioctl,
54f67f63 PV	285	#ifdef CONFIG_COMPAT
	286	.compat_ioctl = ncp_compat_ioctl,
	287	#endif
1da177e4 LT	288	.mmap = ncp_mmap,
	289	.release = ncp_release,
	290	.fsync = ncp_fsync,
	291	};
	292
92e1d5be	293	const struct inode_operations ncp_file_inode_operations =
1da177e4 LT	294	{
	295	.setattr = ncp_notify_change,
	296	};