[deliverable/linux.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/quotaops.h>
#include <linux/buffer_head.h>
#include <linux/aio.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;
	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			= dquot_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,
};

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

	error = inode_change_ok(inode, iattr);
	if (error)
		return error;

	if (is_quota_modification(inode, iattr))
		dquot_initialize(inode);

	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
            (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
		error = dquot_transfer(inode, iattr);
		if (error)
			return error;
	}

	return inode_setattr(inode, iattr);
}

const struct inode_operations udf_file_inode_operations = {
	.truncate		= udf_truncate,
	.setattr		= udf_setattr,
};
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>
759bfee6	37	#include <linux/quotaops.h>
1da177e4	38	#include <linux/buffer_head.h>
e8edc6e0	39	#include <linux/aio.h>
2f07a88b	40	#include <linux/smp_lock.h>
1da177e4 LT	41
	42	#include "udf_i.h"
	43	#include "udf_sb.h"
	44
cb00ea35	45	static int udf_adinicb_readpage(struct file file, struct page page)
1da177e4 LT	46	{
	47	struct inode *inode = page->mapping->host;
	48	char *kaddr;
48d6d8ff	49	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	50
cd7619d6	51	BUG_ON(!PageLocked(page));
1da177e4 LT	52
	53	kaddr = kmap(page);
	54	memset(kaddr, 0, PAGE_CACHE_SIZE);
48d6d8ff	55	memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
1da177e4 LT	56	flush_dcache_page(page);
	57	SetPageUptodate(page);
	58	kunmap(page);
	59	unlock_page(page);
28de7948	60
1da177e4 LT	61	return 0;
	62	}
	63
4b11111a MS	64	static int udf_adinicb_writepage(struct page *page,
4b11111a MS	65	struct writeback_control *wbc)
1da177e4 LT	66	{
	67	struct inode *inode = page->mapping->host;
	68	char *kaddr;
48d6d8ff	69	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	70
cd7619d6	71	BUG_ON(!PageLocked(page));
1da177e4 LT	72
1da177e4 LT	73	kaddr = kmap(page);
48d6d8ff	74	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
1da177e4 LT	75	mark_inode_dirty(inode);
	76	SetPageUptodate(page);
	77	kunmap(page);
	78	unlock_page(page);
28de7948	79
1da177e4 LT	80	return 0;
	81	}
	82
be021ee4 NP	83	static int udf_adinicb_write_end(struct file *file,
	84	struct address_space *mapping,
	85	loff_t pos, unsigned len, unsigned copied,
	86	struct page page, void fsdata)
1da177e4	87	{
be021ee4 NP	88	struct inode *inode = mapping->host;
	89	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
	90	char *kaddr;
48d6d8ff	91	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	92
be021ee4	93	kaddr = kmap_atomic(page, KM_USER0);
48d6d8ff	94	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
be021ee4 NP	95	kaddr + offset, copied);
	96	kunmap_atomic(kaddr, KM_USER0);
	97
	98	return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
1da177e4 LT	99	}
1da177e4 LT	100
f5e54d6e	101	const struct address_space_operations udf_adinicb_aops = {
28de7948 CG	102	.readpage = udf_adinicb_readpage,
	103	.writepage = udf_adinicb_writepage,
	104	.sync_page = block_sync_page,
be021ee4 NP	105	.write_begin = simple_write_begin,
be021ee4 NP	106	.write_end = udf_adinicb_write_end,
1da177e4 LT	107	};
1da177e4 LT	108
543ade1f	109	static ssize_t udf_file_aio_write(struct kiocb iocb, const struct iovec iov,
cb00ea35	110	unsigned long nr_segs, loff_t ppos)
1da177e4 LT	111	{
1da177e4 LT	112	ssize_t retval;
543ade1f	113	struct file *file = iocb->ki_filp;
5096e933	114	struct inode *inode = file->f_path.dentry->d_inode;
1da177e4	115	int err, pos;
543ade1f	116	size_t count = iocb->ki_left;
48d6d8ff	117	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	118
48d6d8ff	119	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1da177e4 LT	120	if (file->f_flags & O_APPEND)
	121	pos = inode->i_size;
	122	else
543ade1f	123	pos = ppos;
1da177e4	124
4b11111a MS	125	if (inode->i_sb->s_blocksize <
4b11111a MS	126	(udf_file_entry_alloc_offset(inode) +
28de7948	127	pos + count)) {
1da177e4	128	udf_expand_file_adinicb(inode, pos + count, &err);
48d6d8ff	129	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1da177e4 LT	130	udf_debug("udf_expand_adinicb: err=%d\n", err);
	131	return err;
	132	}
cb00ea35	133	} else {
1da177e4	134	if (pos + count > inode->i_size)
48d6d8ff	135	iinfo->i_lenAlloc = pos + count;
1da177e4	136	else
48d6d8ff	137	iinfo->i_lenAlloc = inode->i_size;
1da177e4 LT	138	}
	139	}
	140
543ade1f	141	retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
1da177e4 LT	142	if (retval > 0)
1da177e4 LT	143	mark_inode_dirty(inode);
28de7948	144
1da177e4 LT	145	return retval;
	146	}
	147
2f07a88b	148	long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1da177e4	149	{
2f07a88b	150	struct inode *inode = filp->f_dentry->d_inode;
28de7948	151	long old_block, new_block;
1da177e4 LT	152	int result = -EINVAL;
1da177e4 LT	153
2f07a88b JK	154	lock_kernel();
2f07a88b JK	155
cb00ea35	156	if (file_permission(filp, MAY_READ) != 0) {
2f07a88b JK	157	udf_debug("no permission to access inode %lu\n", inode->i_ino);
	158	result = -EPERM;
	159	goto out;
1da177e4 LT	160	}
1da177e4 LT	161
cb00ea35	162	if (!arg) {
1da177e4	163	udf_debug("invalid argument to udf_ioctl\n");
2f07a88b JK	164	result = -EINVAL;
2f07a88b JK	165	goto out;
1da177e4 LT	166	}
1da177e4 LT	167
cb00ea35 CG	168	switch (cmd) {
cb00ea35 CG	169	case UDF_GETVOLIDENT:
4b11111a MS	170	if (copy_to_user((char __user *)arg,
4b11111a MS	171	UDF_SB(inode->i_sb)->s_volume_ident, 32))
2f07a88b	172	result = -EFAULT;
4b11111a	173	else
2f07a88b JK	174	result = 0;
2f07a88b JK	175	goto out;
cb00ea35	176	case UDF_RELOCATE_BLOCKS:
2f07a88b JK	177	if (!capable(CAP_SYS_ADMIN)) {
	178	result = -EACCES;
	179	goto out;
	180	}
	181	if (get_user(old_block, (long __user *)arg)) {
	182	result = -EFAULT;
	183	goto out;
	184	}
4b11111a MS	185	result = udf_relocate_blocks(inode->i_sb,
	186	old_block, &new_block);
	187	if (result == 0)
28de7948	188	result = put_user(new_block, (long __user *)arg);
2f07a88b	189	goto out;
cb00ea35	190	case UDF_GETEASIZE:
c0b34438	191	result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
2f07a88b	192	goto out;
cb00ea35	193	case UDF_GETEABLOCK:
c0b34438 MS	194	result = copy_to_user((char __user *)arg,
	195	UDF_I(inode)->i_ext.i_data,
	196	UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
2f07a88b	197	goto out;
1da177e4 LT	198	}
1da177e4 LT	199
2f07a88b JK	200	out:
2f07a88b JK	201	unlock_kernel();
1da177e4 LT	202	return result;
	203	}
	204
cb00ea35	205	static int udf_release_file(struct inode inode, struct file filp)
1da177e4	206	{
cb00ea35	207	if (filp->f_mode & FMODE_WRITE) {
cbc8cc33	208	mutex_lock(&inode->i_mutex);
1da177e4 LT	209	lock_kernel();
1da177e4 LT	210	udf_discard_prealloc(inode);
2c948b3f	211	udf_truncate_tail_extent(inode);
1da177e4	212	unlock_kernel();
cbc8cc33	213	mutex_unlock(&inode->i_mutex);
1da177e4 LT	214	}
	215	return 0;
	216	}
	217
4b6f5d20	218	const struct file_operations udf_file_operations = {
28de7948 CG	219	.read = do_sync_read,
28de7948 CG	220	.aio_read = generic_file_aio_read,
2f07a88b	221	.unlocked_ioctl = udf_ioctl,
907f4554	222	.open = dquot_file_open,
28de7948 CG	223	.mmap = generic_file_mmap,
	224	.write = do_sync_write,
	225	.aio_write = udf_file_aio_write,
	226	.release = udf_release_file,
1b061d92	227	.fsync = generic_file_fsync,
28de7948	228	.splice_read = generic_file_splice_read,
5c89468c	229	.llseek = generic_file_llseek,
1da177e4 LT	230	};
1da177e4 LT	231
c15d0fc0	232	int udf_setattr(struct dentry dentry, struct iattr iattr)
759bfee6 CH	233	{
	234	struct inode *inode = dentry->d_inode;
	235	int error;
	236
	237	error = inode_change_ok(inode, iattr);
	238	if (error)
	239	return error;
	240
12755627	241	if (is_quota_modification(inode, iattr))
871a2931	242	dquot_initialize(inode);
907f4554	243
759bfee6 CH	244	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) \|\|
759bfee6 CH	245	(iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
b43fa828	246	error = dquot_transfer(inode, iattr);
759bfee6 CH	247	if (error)
	248	return error;
	249	}
	250
	251	return inode_setattr(inode, iattr);
	252	}
	253
c5ef1c42	254	const struct inode_operations udf_file_inode_operations = {
759bfee6 CH	255	.truncate = udf_truncate,
759bfee6 CH	256	.setattr = udf_setattr,
1da177e4	257	};