[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 <linux/udf_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 "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;

	BUG_ON(!PageLocked(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);
	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;

	BUG_ON(!PageLocked(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);
	unlock_page(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;
}

const 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_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_dentry->d_inode;
	int err, pos;
	size_t count = iocb->ki_left;

	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_aio_write(iocb, iov, nr_segs, ppos);

	if (retval > 0)
		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 ( file_permission(filp, 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 __user *)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 __user *)arg)) return -EFAULT;
			if ((result = udf_relocate_blocks(inode->i_sb,
					old, &new)) == 0)
				result = put_user(new, (long __user *)arg);

			return result;
		}
		case UDF_GETEASIZE:
			result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
			break;

		case UDF_GETEABLOCK:
			result = copy_to_user((char __user *)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;
}

const struct file_operations udf_file_operations = {
	.read			= do_sync_read,
	.aio_read		= generic_file_aio_read,
	.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			= udf_fsync_file,
	.sendfile		= generic_file_sendfile,
};

struct inode_operations udf_file_inode_operations = {
	.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>
	30	#include <linux/udf_fs.h>
	31	#include <asm/uaccess.h>
	32	#include <linux/kernel.h>
	33	#include <linux/string.h> /* memset */
16f7e0fe	34	#include <linux/capability.h>
1da177e4 LT	35	#include <linux/errno.h>
	36	#include <linux/smp_lock.h>
	37	#include <linux/pagemap.h>
	38	#include <linux/buffer_head.h>
	39
	40	#include "udf_i.h"
	41	#include "udf_sb.h"
	42
	43	static int udf_adinicb_readpage(struct file file, struct page page)
	44	{
	45	struct inode *inode = page->mapping->host;
	46	char *kaddr;
	47
cd7619d6	48	BUG_ON(!PageLocked(page));
1da177e4 LT	49
	50	kaddr = kmap(page);
	51	memset(kaddr, 0, PAGE_CACHE_SIZE);
	52	memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
	53	flush_dcache_page(page);
	54	SetPageUptodate(page);
	55	kunmap(page);
	56	unlock_page(page);
	57	return 0;
	58	}
	59
	60	static int udf_adinicb_writepage(struct page page, struct writeback_control wbc)
	61	{
	62	struct inode *inode = page->mapping->host;
	63	char *kaddr;
	64
cd7619d6	65	BUG_ON(!PageLocked(page));
1da177e4 LT	66
	67	kaddr = kmap(page);
	68	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
	69	mark_inode_dirty(inode);
	70	SetPageUptodate(page);
	71	kunmap(page);
	72	unlock_page(page);
	73	return 0;
	74	}
	75
	76	static int udf_adinicb_prepare_write(struct file file, struct page page, unsigned offset, unsigned to)
	77	{
	78	kmap(page);
	79	return 0;
	80	}
	81
	82	static int udf_adinicb_commit_write(struct file file, struct page page, unsigned offset, unsigned to)
	83	{
	84	struct inode *inode = page->mapping->host;
	85	char *kaddr = page_address(page);
	86
	87	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
	88	kaddr + offset, to - offset);
	89	mark_inode_dirty(inode);
	90	SetPageUptodate(page);
	91	kunmap(page);
	92	/* only one page here */
	93	if (to > inode->i_size)
	94	inode->i_size = to;
	95	return 0;
	96	}
	97
f5e54d6e	98	const struct address_space_operations udf_adinicb_aops = {
1da177e4 LT	99	.readpage = udf_adinicb_readpage,
	100	.writepage = udf_adinicb_writepage,
	101	.sync_page = block_sync_page,
	102	.prepare_write = udf_adinicb_prepare_write,
	103	.commit_write = udf_adinicb_commit_write,
	104	};
	105
543ade1f BP	106	static ssize_t udf_file_aio_write(struct kiocb iocb, const struct iovec iov,
543ade1f BP	107	unsigned long nr_segs, loff_t ppos)
1da177e4 LT	108	{
1da177e4 LT	109	ssize_t retval;
543ade1f	110	struct file *file = iocb->ki_filp;
1da177e4 LT	111	struct inode *inode = file->f_dentry->d_inode;
1da177e4 LT	112	int err, pos;
543ade1f	113	size_t count = iocb->ki_left;
1da177e4 LT	114
	115	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
	116	{
	117	if (file->f_flags & O_APPEND)
	118	pos = inode->i_size;
	119	else
543ade1f	120	pos = ppos;
1da177e4 LT	121
	122	if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
	123	pos + count))
	124	{
	125	udf_expand_file_adinicb(inode, pos + count, &err);
	126	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
	127	{
	128	udf_debug("udf_expand_adinicb: err=%d\n", err);
	129	return err;
	130	}
	131	}
	132	else
	133	{
	134	if (pos + count > inode->i_size)
	135	UDF_I_LENALLOC(inode) = pos + count;
	136	else
	137	UDF_I_LENALLOC(inode) = inode->i_size;
	138	}
	139	}
	140
543ade1f	141	retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
1da177e4 LT	142
	143	if (retval > 0)
	144	mark_inode_dirty(inode);
	145	return retval;
	146	}
	147
	148	/*
	149	* udf_ioctl
	150	*
	151	* PURPOSE
	152	* Issue an ioctl.
	153	*
	154	* DESCRIPTION
	155	* Optional - sys_ioctl() will return -ENOTTY if this routine is not
	156	* available, and the ioctl cannot be handled without filesystem help.
	157	*
	158	* sys_ioctl() handles these ioctls that apply only to regular files:
	159	* FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
	160	* These ioctls are also handled by sys_ioctl():
	161	* FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
	162	* All other ioctls are passed to the filesystem.
	163	*
	164	* Refer to sys_ioctl() in fs/ioctl.c
	165	* sys_ioctl() -> .
	166	*
	167	* PRE-CONDITIONS
	168	* inode Pointer to inode that ioctl was issued on.
	169	* filp Pointer to file that ioctl was issued on.
	170	* cmd The ioctl command.
	171	* arg The ioctl argument [can be interpreted as a
	172	* user-space pointer if desired].
	173	*
	174	* POST-CONDITIONS
	175	* <return> Success (>=0) or an error code (<=0) that
	176	* sys_ioctl() will return.
	177	*
	178	* HISTORY
	179	* July 1, 1997 - Andrew E. Mileski
	180	* Written, tested, and released.
	181	*/
	182	int udf_ioctl(struct inode inode, struct file filp, unsigned int cmd,
	183	unsigned long arg)
	184	{
	185	int result = -EINVAL;
	186
8c744fb8	187	if ( file_permission(filp, MAY_READ) != 0 )
1da177e4 LT	188	{
	189	udf_debug("no permission to access inode %lu\n",
	190	inode->i_ino);
	191	return -EPERM;
	192	}
	193
	194	if ( !arg )
	195	{
	196	udf_debug("invalid argument to udf_ioctl\n");
	197	return -EINVAL;
	198	}
	199
	200	switch (cmd)
	201	{
	202	case UDF_GETVOLIDENT:
	203	return copy_to_user((char __user *)arg,
	204	UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
	205	case UDF_RELOCATE_BLOCKS:
	206	{
	207	long old, new;
	208
	209	if (!capable(CAP_SYS_ADMIN)) return -EACCES;
	210	if (get_user(old, (long __user *)arg)) return -EFAULT;
	211	if ((result = udf_relocate_blocks(inode->i_sb,
	212	old, &new)) == 0)
	213	result = put_user(new, (long __user *)arg);
	214
	215	return result;
	216	}
	217	case UDF_GETEASIZE:
	218	result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
	219	break;
	220
	221	case UDF_GETEABLOCK:
	222	result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
	223	UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
	224	break;
	225	}
	226
	227	return result;
	228	}
	229
	230	/*
	231	* udf_release_file
	232	*
	233	* PURPOSE
	234	* Called when all references to the file are closed
	235	*
	236	* DESCRIPTION
	237	* Discard prealloced blocks
	238	*
	239	* HISTORY
	240	*
	241	*/
	242	static int udf_release_file(struct inode * inode, struct file * filp)
	243	{
	244	if (filp->f_mode & FMODE_WRITE)
	245	{
	246	lock_kernel();
	247	udf_discard_prealloc(inode);
	248	unlock_kernel();
	249	}
	250	return 0;
	251	}
252
4b6f5d20	253	const struct file_operations udf_file_operations = {
543ade1f BP	254	.read = do_sync_read,
543ade1f BP	255	.aio_read = generic_file_aio_read,
1da177e4 LT	256	.ioctl = udf_ioctl,
	257	.open = generic_file_open,
	258	.mmap = generic_file_mmap,
543ade1f BP	259	.write = do_sync_write,
543ade1f BP	260	.aio_write = udf_file_aio_write,
1da177e4 LT	261	.release = udf_release_file,
	262	.fsync = udf_fsync_file,
	263	.sendfile = generic_file_sendfile,
	264	};
	265
	266	struct inode_operations udf_file_inode_operations = {
	267	.truncate = udf_truncate,
	268	};