fs/ncpfs/file.c - kernel/msm-4.19 - Gitiles

 /*
  *  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, 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;
 	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);

 	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_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 (!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) {
 			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 > 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;
 }

 static loff_t ncp_remote_llseek(struct file *file, loff_t offset, int origin)
 {
 	loff_t ret;
 	lock_kernel();
 	ret = generic_file_llseek_unlocked(file, offset, origin);
 	unlock_kernel();
 	return ret;
 }

 const struct file_operations ncp_file_operations =
 {
 	.llseek 	= ncp_remote_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,
 };
	/*
	* 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, 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;
	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);

	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_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 (!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) {
	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 > 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;
	}

	static loff_t ncp_remote_llseek(struct file *file, loff_t offset, int origin)
	{
	loff_t ret;
	lock_kernel();
	ret = generic_file_llseek_unlocked(file, offset, origin);
	unlock_kernel();
	return ret;
	}

	const struct file_operations ncp_file_operations =
	{
	.llseek = ncp_remote_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,
	};