/* * file.c * * PURPOSE *  File handling routines for the OSTA-UDF(tm) filesystem. * * CONTACTS *  E-mail regarding any portion of the Linux UDF file system should be *  directed to the development team mailing list (run by majordomo): *    linux_udf@hpesjro.fc.hp.com * * COPYRIGHT *  This file is distributed under the terms of the GNU General Public *  License (GPL). Copies of the GPL can be obtained from: *    ftp://prep.ai.mit.edu/pub/gnu/GPL *  Each contributing author retains all rights to their own work. * *  (C) 1998-1999 Dave Boynton *  (C) 1998-2001 Ben Fennema *  (C) 1999-2000 Stelias Computing Inc * * HISTORY * *  10/02/98 dgb  Attempt to integrate into udf.o *  10/07/98      Switched to using generic_readpage, etc., like isofs *                And it works! *  12/06/98 blf  Added udf_file_read. uses generic_file_read for all cases but *                ICBTAG_FLAG_AD_IN_ICB. *  04/06/99      64 bit file handling on 32 bit systems taken from ext2 file.c *  05/12/99      Preliminary file write support */#include "udfdecl.h"#include <linux/fs.h>#include <linux/udf_fs.h>#include <asm/uaccess.h>#include <linux/kernel.h>#include <linux/string.h> /* memset */#include <linux/errno.h>#include <linux/locks.h>#include <linux/smp_lock.h>#include "udf_i.h"#include "udf_sb.h"static int udf_adinicb_readpage(struct file *file, struct page * page){	struct inode *inode = page->mapping->host;	char *kaddr;	if (!PageLocked(page))		PAGE_BUG(page);	kaddr = kmap(page);	memset(kaddr, 0, PAGE_CACHE_SIZE);	memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);	flush_dcache_page(page);	SetPageUptodate(page);	kunmap(page);	UnlockPage(page);	return 0;}static int udf_adinicb_writepage(struct page *page){	struct inode *inode = page->mapping->host;	char *kaddr;	if (!PageLocked(page))		PAGE_BUG(page);	kaddr = kmap(page);	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);	mark_inode_dirty(inode);	SetPageUptodate(page);	kunmap(page);	UnlockPage(page);	return 0;}static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to){	kmap(page);	return 0;}static int udf_adinicb_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to){	struct inode *inode = page->mapping->host;	char *kaddr = page_address(page);	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,		kaddr + offset, to - offset);	mark_inode_dirty(inode);	SetPageUptodate(page);	kunmap(page);	/* only one page here */	if (to > inode->i_size)		inode->i_size = to;	return 0;}struct address_space_operations udf_adinicb_aops = {	readpage:		udf_adinicb_readpage,	writepage:		udf_adinicb_writepage,	sync_page:		block_sync_page,	prepare_write:		udf_adinicb_prepare_write,	commit_write:		udf_adinicb_commit_write,};static ssize_t udf_file_write(struct file * file, const char * buf,	size_t count, loff_t *ppos){	ssize_t retval;	struct inode *inode = file->f_dentry->d_inode;	int err, pos;	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)	{		if (file->f_flags & O_APPEND)			pos = inode->i_size;		else			pos = *ppos;		if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +			pos + count))		{			udf_expand_file_adinicb(inode, pos + count, &err);			if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)			{				udf_debug("udf_expand_adinicb: err=%d\n", err);				return err;			}		}		else		{			if (pos + count > inode->i_size)				UDF_I_LENALLOC(inode) = pos + count;			else				UDF_I_LENALLOC(inode) = inode->i_size;		}	}	retval = generic_file_write(file, buf, count, ppos);	if (retval > 0)	{		UDF_I_UCTIME(inode) = UDF_I_UMTIME(inode) = CURRENT_UTIME;		mark_inode_dirty(inode);	}	return retval;}/* * udf_ioctl * * PURPOSE *	Issue an ioctl. * * DESCRIPTION *	Optional - sys_ioctl() will return -ENOTTY if this routine is not *	available, and the ioctl cannot be handled without filesystem help. * *	sys_ioctl() handles these ioctls that apply only to regular files: *		FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD *	These ioctls are also handled by sys_ioctl(): *		FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC *	All other ioctls are passed to the filesystem. * *	Refer to sys_ioctl() in fs/ioctl.c *	sys_ioctl() -> . * * PRE-CONDITIONS *	inode			Pointer to inode that ioctl was issued on. *	filp			Pointer to file that ioctl was issued on. *	cmd			The ioctl command. *	arg			The ioctl argument [can be interpreted as a *				user-space pointer if desired]. * * POST-CONDITIONS *	<return>		Success (>=0) or an error code (<=0) that *				sys_ioctl() will return. * * HISTORY *	July 1, 1997 - Andrew E. Mileski *	Written, tested, and released. */int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,	unsigned long arg){	int result = -EINVAL;	if ( permission(inode, MAY_READ) != 0 )	{		udf_debug("no permission to access inode %lu\n",						inode->i_ino);		return -EPERM;	}	if ( !arg )	{		udf_debug("invalid argument to udf_ioctl\n");		return -EINVAL;	}	switch (cmd)	{		case UDF_GETVOLIDENT:			return copy_to_user((char *)arg,				UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;		case UDF_RELOCATE_BLOCKS:		{			long old, new;			if (!capable(CAP_SYS_ADMIN)) return -EACCES;			if (get_user(old, (long *)arg)) return -EFAULT;			if ((result = udf_relocate_blocks(inode->i_sb,					old, &new)) == 0)				result = put_user(new, (long *)arg);			return result;		}		case UDF_GETEASIZE:			result = put_user(UDF_I_LENEATTR(inode), (int *)arg);			break;		case UDF_GETEABLOCK:			result = copy_to_user((char *)arg, UDF_I_DATA(inode),				UDF_I_LENEATTR(inode)) ? -EFAULT : 0;			break;	}	return result;}/* * udf_release_file * * PURPOSE *  Called when all references to the file are closed * * DESCRIPTION *  Discard prealloced blocks * * HISTORY * */static int udf_release_file(struct inode * inode, struct file * filp){	if (filp->f_mode & FMODE_WRITE)	{		lock_kernel();		udf_discard_prealloc(inode);		unlock_kernel();	}	return 0;}/* * udf_open_file * * PURPOSE *  Called when an inode is about to be open. * * DESCRIPTION *  Use this to disallow opening RW large files on 32 bit systems. *  On 64 bit systems we force on O_LARGEFILE in sys_open. * * HISTORY * */static int udf_open_file(struct inode * inode, struct file * filp){	if ((inode->i_size & 0xFFFFFFFF80000000ULL) && !(filp->f_flags & O_LARGEFILE))		return -EFBIG;	return 0;}struct file_operations udf_file_operations = {	read:			generic_file_read,	ioctl:			udf_ioctl,	open:			udf_open_file,	mmap:			generic_file_mmap,	write:			udf_file_write,	release:		udf_release_file,	fsync:			udf_fsync_file,};struct inode_operations udf_file_inode_operations = {	truncate:		udf_truncate,};