[net-next-2.6.git] / fs / udf / file.c

/*
 * 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>
#include <linux/string.h> /* memset */
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/aio.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;
	struct udf_inode_info *iinfo = UDF_I(inode);

	BUG_ON(!PageLocked(page));

	kaddr = kmap(page);
	memset(kaddr, 0, PAGE_CACHE_SIZE);
	memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
	flush_dcache_page(page);
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);

	return 0;
}

static int udf_adinicb_writepage(struct page *page,
				 struct writeback_control *wbc)
{
	struct inode *inode = page->mapping->host;
	char *kaddr;
	struct udf_inode_info *iinfo = UDF_I(inode);

	BUG_ON(!PageLocked(page));

	kaddr = kmap(page);
	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
	mark_inode_dirty(inode);
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);

	return 0;
}

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)
{
	struct inode *inode = mapping->host;
	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
	char *kaddr;
	struct udf_inode_info *iinfo = UDF_I(inode);

	kaddr = kmap_atomic(page, KM_USER0);
	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
		kaddr + offset, copied);
	kunmap_atomic(kaddr, KM_USER0);

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

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

static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
				  unsigned long nr_segs, loff_t ppos)
{
	ssize_t retval;
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_path.dentry->d_inode;
	int err, pos;
	size_t count = iocb->ki_left;
	struct udf_inode_info *iinfo = UDF_I(inode);

	if (iinfo->i_alloc_type == 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 (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
				udf_debug("udf_expand_adinicb: err=%d\n", err);
				return err;
			}
		} else {
			if (pos + count > inode->i_size)
				iinfo->i_lenAlloc = pos + count;
			else
				iinfo->i_lenAlloc = inode->i_size;
		}
	}

	retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
	if (retval > 0)
		mark_inode_dirty(inode);

	return retval;
}

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

	lock_kernel();

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

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

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

out:
	unlock_kernel();
	return result;
}

static int udf_release_file(struct inode *inode, struct file *filp)
{
	if (filp->f_mode & FMODE_WRITE) {
		mutex_lock(&inode->i_mutex);
		lock_kernel();
		udf_discard_prealloc(inode);
		udf_truncate_tail_extent(inode);
		unlock_kernel();
		mutex_unlock(&inode->i_mutex);
	}
	return 0;
}

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

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;

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

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

const struct inode_operations udf_file_inode_operations = {
	.setattr		= udf_setattr,
	.truncate		= udf_truncate,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* file.c
	3	*
	4	* PURPOSE
	5	* File handling routines for the OSTA-UDF(tm) filesystem.
	6	*
1da177e4 LT	7	* COPYRIGHT
	8	* This file is distributed under the terms of the GNU General Public
	9	* License (GPL). Copies of the GPL can be obtained from:
	10	* ftp://prep.ai.mit.edu/pub/gnu/GPL
	11	* Each contributing author retains all rights to their own work.
	12	*
	13	* (C) 1998-1999 Dave Boynton
	14	* (C) 1998-2004 Ben Fennema
	15	* (C) 1999-2000 Stelias Computing Inc
	16	*
	17	* HISTORY
	18	*
	19	* 10/02/98 dgb Attempt to integrate into udf.o
	20	* 10/07/98 Switched to using generic_readpage, etc., like isofs
	21	* And it works!
	22	* 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
	23	* ICBTAG_FLAG_AD_IN_ICB.
	24	* 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
	25	* 05/12/99 Preliminary file write support
	26	*/
	27
	28	#include "udfdecl.h"
	29	#include <linux/fs.h>
1da177e4 LT	30	#include <asm/uaccess.h>
1da177e4 LT	31	#include <linux/kernel.h>
28de7948	32	#include <linux/string.h> /* memset */
16f7e0fe	33	#include <linux/capability.h>
1da177e4 LT	34	#include <linux/errno.h>
	35	#include <linux/smp_lock.h>
	36	#include <linux/pagemap.h>
	37	#include <linux/buffer_head.h>
e8edc6e0	38	#include <linux/aio.h>
1da177e4 LT	39
	40	#include "udf_i.h"
	41	#include "udf_sb.h"
	42
cb00ea35	43	static int udf_adinicb_readpage(struct file file, struct page page)
1da177e4 LT	44	{
	45	struct inode *inode = page->mapping->host;
	46	char *kaddr;
48d6d8ff	47	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	48
cd7619d6	49	BUG_ON(!PageLocked(page));
1da177e4 LT	50
	51	kaddr = kmap(page);
	52	memset(kaddr, 0, PAGE_CACHE_SIZE);
48d6d8ff	53	memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
1da177e4 LT	54	flush_dcache_page(page);
	55	SetPageUptodate(page);
	56	kunmap(page);
	57	unlock_page(page);
28de7948	58
1da177e4 LT	59	return 0;
	60	}
	61
4b11111a MS	62	static int udf_adinicb_writepage(struct page *page,
4b11111a MS	63	struct writeback_control *wbc)
1da177e4 LT	64	{
	65	struct inode *inode = page->mapping->host;
	66	char *kaddr;
48d6d8ff	67	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	68
cd7619d6	69	BUG_ON(!PageLocked(page));
1da177e4 LT	70
1da177e4 LT	71	kaddr = kmap(page);
48d6d8ff	72	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
1da177e4 LT	73	mark_inode_dirty(inode);
	74	SetPageUptodate(page);
	75	kunmap(page);
	76	unlock_page(page);
28de7948	77
1da177e4 LT	78	return 0;
	79	}
	80
be021ee4 NP	81	static int udf_adinicb_write_end(struct file *file,
	82	struct address_space *mapping,
	83	loff_t pos, unsigned len, unsigned copied,
	84	struct page page, void fsdata)
1da177e4	85	{
be021ee4 NP	86	struct inode *inode = mapping->host;
	87	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
	88	char *kaddr;
48d6d8ff	89	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	90
be021ee4	91	kaddr = kmap_atomic(page, KM_USER0);
48d6d8ff	92	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
be021ee4 NP	93	kaddr + offset, copied);
	94	kunmap_atomic(kaddr, KM_USER0);
	95
	96	return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
1da177e4 LT	97	}
1da177e4 LT	98
f5e54d6e	99	const struct address_space_operations udf_adinicb_aops = {
28de7948 CG	100	.readpage = udf_adinicb_readpage,
	101	.writepage = udf_adinicb_writepage,
	102	.sync_page = block_sync_page,
be021ee4 NP	103	.write_begin = simple_write_begin,
be021ee4 NP	104	.write_end = udf_adinicb_write_end,
1da177e4 LT	105	};
1da177e4 LT	106
543ade1f	107	static ssize_t udf_file_aio_write(struct kiocb iocb, const struct iovec iov,
cb00ea35	108	unsigned long nr_segs, loff_t ppos)
1da177e4 LT	109	{
1da177e4 LT	110	ssize_t retval;
543ade1f	111	struct file *file = iocb->ki_filp;
5096e933	112	struct inode *inode = file->f_path.dentry->d_inode;
1da177e4	113	int err, pos;
543ade1f	114	size_t count = iocb->ki_left;
48d6d8ff	115	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	116
48d6d8ff	117	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1da177e4 LT	118	if (file->f_flags & O_APPEND)
	119	pos = inode->i_size;
	120	else
543ade1f	121	pos = ppos;
1da177e4	122
4b11111a MS	123	if (inode->i_sb->s_blocksize <
4b11111a MS	124	(udf_file_entry_alloc_offset(inode) +
28de7948	125	pos + count)) {
1da177e4	126	udf_expand_file_adinicb(inode, pos + count, &err);
48d6d8ff	127	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1da177e4 LT	128	udf_debug("udf_expand_adinicb: err=%d\n", err);
	129	return err;
	130	}
cb00ea35	131	} else {
1da177e4	132	if (pos + count > inode->i_size)
48d6d8ff	133	iinfo->i_lenAlloc = pos + count;
1da177e4	134	else
48d6d8ff	135	iinfo->i_lenAlloc = inode->i_size;
1da177e4 LT	136	}
	137	}
	138
543ade1f	139	retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
1da177e4 LT	140	if (retval > 0)
1da177e4 LT	141	mark_inode_dirty(inode);
28de7948	142
1da177e4 LT	143	return retval;
	144	}
	145
2f07a88b	146	long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1da177e4	147	{
2f07a88b	148	struct inode *inode = filp->f_dentry->d_inode;
28de7948	149	long old_block, new_block;
1da177e4 LT	150	int result = -EINVAL;
1da177e4 LT	151
2f07a88b JK	152	lock_kernel();
2f07a88b JK	153
cb00ea35	154	if (file_permission(filp, MAY_READ) != 0) {
2f07a88b JK	155	udf_debug("no permission to access inode %lu\n", inode->i_ino);
	156	result = -EPERM;
	157	goto out;
1da177e4 LT	158	}
1da177e4 LT	159
cb00ea35	160	if (!arg) {
1da177e4	161	udf_debug("invalid argument to udf_ioctl\n");
2f07a88b JK	162	result = -EINVAL;
2f07a88b JK	163	goto out;
1da177e4 LT	164	}
1da177e4 LT	165
cb00ea35 CG	166	switch (cmd) {
cb00ea35 CG	167	case UDF_GETVOLIDENT:
4b11111a MS	168	if (copy_to_user((char __user *)arg,
4b11111a MS	169	UDF_SB(inode->i_sb)->s_volume_ident, 32))
2f07a88b	170	result = -EFAULT;
4b11111a	171	else
2f07a88b JK	172	result = 0;
2f07a88b JK	173	goto out;
cb00ea35	174	case UDF_RELOCATE_BLOCKS:
2f07a88b JK	175	if (!capable(CAP_SYS_ADMIN)) {
	176	result = -EACCES;
	177	goto out;
	178	}
	179	if (get_user(old_block, (long __user *)arg)) {
	180	result = -EFAULT;
	181	goto out;
	182	}
4b11111a MS	183	result = udf_relocate_blocks(inode->i_sb,
	184	old_block, &new_block);
	185	if (result == 0)
28de7948	186	result = put_user(new_block, (long __user *)arg);
2f07a88b	187	goto out;
cb00ea35	188	case UDF_GETEASIZE:
c0b34438	189	result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
2f07a88b	190	goto out;
cb00ea35	191	case UDF_GETEABLOCK:
c0b34438 MS	192	result = copy_to_user((char __user *)arg,
	193	UDF_I(inode)->i_ext.i_data,
	194	UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
2f07a88b	195	goto out;
1da177e4 LT	196	}
1da177e4 LT	197
2f07a88b JK	198	out:
2f07a88b JK	199	unlock_kernel();
1da177e4 LT	200	return result;
	201	}
	202
cb00ea35	203	static int udf_release_file(struct inode inode, struct file filp)
1da177e4	204	{
cb00ea35	205	if (filp->f_mode & FMODE_WRITE) {
cbc8cc33	206	mutex_lock(&inode->i_mutex);
1da177e4 LT	207	lock_kernel();
1da177e4 LT	208	udf_discard_prealloc(inode);
2c948b3f	209	udf_truncate_tail_extent(inode);
1da177e4	210	unlock_kernel();
cbc8cc33	211	mutex_unlock(&inode->i_mutex);
1da177e4 LT	212	}
	213	return 0;
	214	}
	215
4b6f5d20	216	const struct file_operations udf_file_operations = {
28de7948 CG	217	.read = do_sync_read,
28de7948 CG	218	.aio_read = generic_file_aio_read,
2f07a88b	219	.unlocked_ioctl = udf_ioctl,
36350462	220	.open = generic_file_open,
28de7948 CG	221	.mmap = generic_file_mmap,
	222	.write = do_sync_write,
	223	.aio_write = udf_file_aio_write,
	224	.release = udf_release_file,
1b061d92	225	.fsync = generic_file_fsync,
28de7948	226	.splice_read = generic_file_splice_read,
5c89468c	227	.llseek = generic_file_llseek,
1da177e4 LT	228	};
1da177e4 LT	229
d39aae9e CH	230	static int udf_setattr(struct dentry dentry, struct iattr attr)
	231	{
	232	struct inode *inode = dentry->d_inode;
	233	int error;
	234
	235	error = inode_change_ok(inode, attr);
	236	if (error)
	237	return error;
1025774c CH	238
	239	if ((attr->ia_valid & ATTR_SIZE) &&
	240	attr->ia_size != i_size_read(inode)) {
	241	error = vmtruncate(inode, attr->ia_size);
	242	if (error)
	243	return error;
	244	}
	245
	246	setattr_copy(inode, attr);
	247	mark_inode_dirty(inode);
	248	return 0;
d39aae9e CH	249	}
d39aae9e CH	250
c5ef1c42	251	const struct inode_operations udf_file_inode_operations = {
d39aae9e	252	.setattr = udf_setattr,
759bfee6	253	.truncate = udf_truncate,
1da177e4	254	};