file.c 6.1 KB
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/*
 * file.c
 *
 * PURPOSE
 *  File handling routines for the OSTA-UDF(tm) filesystem.
 *
 * 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) 1998-2004 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 <asm/uaccess.h>
#include <linux/kernel.h>
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#include <linux/string.h> /* memset */
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#include <linux/capability.h>
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#include <linux/errno.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
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#include <linux/aio.h>
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#include "udf_i.h"
#include "udf_sb.h"

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static int udf_adinicb_readpage(struct file *file, struct page *page)
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{
	struct inode *inode = page->mapping->host;
	char *kaddr;
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	struct udf_inode_info *iinfo = UDF_I(inode);
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	BUG_ON(!PageLocked(page));
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	kaddr = kmap(page);
	memset(kaddr, 0, PAGE_CACHE_SIZE);
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	memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
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	flush_dcache_page(page);
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
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	return 0;
}

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static int udf_adinicb_writepage(struct page *page,
				 struct writeback_control *wbc)
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{
	struct inode *inode = page->mapping->host;
	char *kaddr;
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	struct udf_inode_info *iinfo = UDF_I(inode);
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	BUG_ON(!PageLocked(page));
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	kaddr = kmap(page);
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	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
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	mark_inode_dirty(inode);
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
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	return 0;
}

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static int udf_adinicb_write_end(struct file *file,
			struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata)
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{
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	struct inode *inode = mapping->host;
	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
	char *kaddr;
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	struct udf_inode_info *iinfo = UDF_I(inode);
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	kaddr = kmap_atomic(page, KM_USER0);
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	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
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		kaddr + offset, copied);
	kunmap_atomic(kaddr, KM_USER0);

	return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
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}

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const struct address_space_operations udf_adinicb_aops = {
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	.readpage	= udf_adinicb_readpage,
	.writepage	= udf_adinicb_writepage,
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	.write_begin = simple_write_begin,
	.write_end = udf_adinicb_write_end,
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};

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static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
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				  unsigned long nr_segs, loff_t ppos)
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{
	ssize_t retval;
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	struct file *file = iocb->ki_filp;
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	struct inode *inode = file->f_path.dentry->d_inode;
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	int err, pos;
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	size_t count = iocb->ki_left;
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	struct udf_inode_info *iinfo = UDF_I(inode);
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	down_write(&iinfo->i_data_sem);
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	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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		if (file->f_flags & O_APPEND)
			pos = inode->i_size;
		else
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			pos = ppos;
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		if (inode->i_sb->s_blocksize <
				(udf_file_entry_alloc_offset(inode) +
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						pos + count)) {
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			err = udf_expand_file_adinicb(inode);
			if (err) {
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				udf_debug("udf_expand_adinicb: err=%d\n", err);
				return err;
			}
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		} else {
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			if (pos + count > inode->i_size)
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				iinfo->i_lenAlloc = pos + count;
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			else
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				iinfo->i_lenAlloc = inode->i_size;
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			up_write(&iinfo->i_data_sem);
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		}
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	} else
		up_write(&iinfo->i_data_sem);
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	retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
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	if (retval > 0)
		mark_inode_dirty(inode);
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	return retval;
}

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long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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	struct inode *inode = filp->f_dentry->d_inode;
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	long old_block, new_block;
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	int result = -EINVAL;

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	if (inode_permission(inode, MAY_READ) != 0) {
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		udf_debug("no permission to access inode %lu\n", inode->i_ino);
		result = -EPERM;
		goto out;
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	}

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	if (!arg) {
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		udf_debug("invalid argument to udf_ioctl\n");
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		result = -EINVAL;
		goto out;
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	}

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	switch (cmd) {
	case UDF_GETVOLIDENT:
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		if (copy_to_user((char __user *)arg,
				 UDF_SB(inode->i_sb)->s_volume_ident, 32))
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			result = -EFAULT;
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		else
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			result = 0;
		goto out;
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	case UDF_RELOCATE_BLOCKS:
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		if (!capable(CAP_SYS_ADMIN)) {
			result = -EACCES;
			goto out;
		}
		if (get_user(old_block, (long __user *)arg)) {
			result = -EFAULT;
			goto out;
		}
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		result = udf_relocate_blocks(inode->i_sb,
						old_block, &new_block);
		if (result == 0)
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			result = put_user(new_block, (long __user *)arg);
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		goto out;
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	case UDF_GETEASIZE:
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		result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
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		goto out;
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	case UDF_GETEABLOCK:
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		result = copy_to_user((char __user *)arg,
				      UDF_I(inode)->i_ext.i_data,
				      UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
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		goto out;
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	}

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out:
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	return result;
}

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static int udf_release_file(struct inode *inode, struct file *filp)
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{
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	if (filp->f_mode & FMODE_WRITE) {
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		down_write(&UDF_I(inode)->i_data_sem);
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		udf_discard_prealloc(inode);
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		udf_truncate_tail_extent(inode);
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		up_write(&UDF_I(inode)->i_data_sem);
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	}
	return 0;
}

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const struct file_operations udf_file_operations = {
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	.read			= do_sync_read,
	.aio_read		= generic_file_aio_read,
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	.unlocked_ioctl		= udf_ioctl,
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	.open			= generic_file_open,
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	.mmap			= generic_file_mmap,
	.write			= do_sync_write,
	.aio_write		= udf_file_aio_write,
	.release		= udf_release_file,
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	.fsync			= generic_file_fsync,
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	.splice_read		= generic_file_splice_read,
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	.llseek			= generic_file_llseek,
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};

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static int udf_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	int error;

	error = inode_change_ok(inode, attr);
	if (error)
		return error;
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	if ((attr->ia_valid & ATTR_SIZE) &&
	    attr->ia_size != i_size_read(inode)) {
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		error = udf_setsize(inode, attr->ia_size);
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		if (error)
			return error;
	}

	setattr_copy(inode, attr);
	mark_inode_dirty(inode);
	return 0;
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}

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const struct inode_operations udf_file_inode_operations = {
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	.setattr		= udf_setattr,
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};