[linux-2.6-block.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 <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;

	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_path.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)
{
	long old_block, new_block;
	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:
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		if (get_user(old_block, (long __user *)arg))
			return -EFAULT;
		if ((result = udf_relocate_blocks(inode->i_sb,
						  old_block, &new_block)) == 0)
			result = put_user(new_block, (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,
	.splice_read		= generic_file_splice_read,
};

const 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>
28de7948	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>
e8edc6e0	39	#include <linux/aio.h>
1da177e4 LT	40
	41	#include "udf_i.h"
	42	#include "udf_sb.h"
	43
cb00ea35	44	static int udf_adinicb_readpage(struct file file, struct page page)
1da177e4 LT	45	{
	46	struct inode *inode = page->mapping->host;
	47	char *kaddr;
	48
cd7619d6	49	BUG_ON(!PageLocked(page));
1da177e4 LT	50
	51	kaddr = kmap(page);
	52	memset(kaddr, 0, PAGE_CACHE_SIZE);
	53	memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
	54	flush_dcache_page(page);
	55	SetPageUptodate(page);
	56	kunmap(page);
	57	unlock_page(page);
28de7948	58
1da177e4 LT	59	return 0;
	60	}
	61
28de7948	62	static int udf_adinicb_writepage(struct page page, struct writeback_control wbc)
1da177e4 LT	63	{
	64	struct inode *inode = page->mapping->host;
	65	char *kaddr;
	66
cd7619d6	67	BUG_ON(!PageLocked(page));
1da177e4 LT	68
	69	kaddr = kmap(page);
	70	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
	71	mark_inode_dirty(inode);
	72	SetPageUptodate(page);
	73	kunmap(page);
	74	unlock_page(page);
28de7948	75
1da177e4 LT	76	return 0;
	77	}
	78
cb00ea35 CG	79	static int udf_adinicb_prepare_write(struct file file, struct page page,
cb00ea35 CG	80	unsigned offset, unsigned to)
1da177e4 LT	81	{
	82	kmap(page);
	83	return 0;
	84	}
	85
cb00ea35 CG	86	static int udf_adinicb_commit_write(struct file file, struct page page,
cb00ea35 CG	87	unsigned offset, unsigned to)
1da177e4 LT	88	{
	89	struct inode *inode = page->mapping->host;
	90	char *kaddr = page_address(page);
	91
	92	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
cb00ea35	93	kaddr + offset, to - offset);
1da177e4 LT	94	mark_inode_dirty(inode);
	95	SetPageUptodate(page);
	96	kunmap(page);
	97	/* only one page here */
	98	if (to > inode->i_size)
	99	inode->i_size = to;
	100	return 0;
	101	}
	102
f5e54d6e	103	const struct address_space_operations udf_adinicb_aops = {
28de7948 CG	104	.readpage = udf_adinicb_readpage,
	105	.writepage = udf_adinicb_writepage,
	106	.sync_page = block_sync_page,
	107	.prepare_write = udf_adinicb_prepare_write,
	108	.commit_write = udf_adinicb_commit_write,
1da177e4 LT	109	};
1da177e4 LT	110
543ade1f	111	static ssize_t udf_file_aio_write(struct kiocb iocb, const struct iovec iov,
cb00ea35	112	unsigned long nr_segs, loff_t ppos)
1da177e4 LT	113	{
1da177e4 LT	114	ssize_t retval;
543ade1f	115	struct file *file = iocb->ki_filp;
5096e933	116	struct inode *inode = file->f_path.dentry->d_inode;
1da177e4	117	int err, pos;
543ade1f	118	size_t count = iocb->ki_left;
1da177e4	119
cb00ea35	120	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
1da177e4 LT	121	if (file->f_flags & O_APPEND)
	122	pos = inode->i_size;
	123	else
543ade1f	124	pos = ppos;
1da177e4	125
28de7948 CG	126	if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
28de7948 CG	127	pos + count)) {
1da177e4	128	udf_expand_file_adinicb(inode, pos + count, &err);
cb00ea35	129	if (UDF_I_ALLOCTYPE(inode) == 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 LT	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	if (retval > 0)
1da177e4 LT	143	mark_inode_dirty(inode);
28de7948	144
1da177e4 LT	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,
cb00ea35	183	unsigned long arg)
1da177e4	184	{
28de7948	185	long old_block, new_block;
1da177e4 LT	186	int result = -EINVAL;
1da177e4 LT	187
cb00ea35	188	if (file_permission(filp, MAY_READ) != 0) {
28de7948 CG	189	udf_debug("no permission to access inode %lu\n",
28de7948 CG	190	inode->i_ino);
1da177e4 LT	191	return -EPERM;
	192	}
	193
cb00ea35	194	if (!arg) {
1da177e4 LT	195	udf_debug("invalid argument to udf_ioctl\n");
	196	return -EINVAL;
	197	}
	198
cb00ea35 CG	199	switch (cmd) {
	200	case UDF_GETVOLIDENT:
	201	return copy_to_user((char __user *)arg,
28de7948	202	UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
cb00ea35	203	case UDF_RELOCATE_BLOCKS:
28de7948 CG	204	if (!capable(CAP_SYS_ADMIN))
	205	return -EACCES;
	206	if (get_user(old_block, (long __user *)arg))
	207	return -EFAULT;
	208	if ((result = udf_relocate_blocks(inode->i_sb,
	209	old_block, &new_block)) == 0)
	210	result = put_user(new_block, (long __user *)arg);
	211	return result;
cb00ea35 CG	212	case UDF_GETEASIZE:
	213	result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
	214	break;
cb00ea35 CG	215	case UDF_GETEABLOCK:
	216	result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
	217	UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
	218	break;
1da177e4 LT	219	}
	220
	221	return result;
	222	}
	223
	224	/*
	225	* udf_release_file
	226	*
	227	* PURPOSE
	228	* Called when all references to the file are closed
	229	*
	230	* DESCRIPTION
	231	* Discard prealloced blocks
	232	*
	233	* HISTORY
	234	*
	235	*/
cb00ea35	236	static int udf_release_file(struct inode inode, struct file filp)
1da177e4	237	{
cb00ea35	238	if (filp->f_mode & FMODE_WRITE) {
1da177e4 LT	239	lock_kernel();
	240	udf_discard_prealloc(inode);
	241	unlock_kernel();
	242	}
	243	return 0;
	244	}
	245
4b6f5d20	246	const struct file_operations udf_file_operations = {
28de7948 CG	247	.read = do_sync_read,
	248	.aio_read = generic_file_aio_read,
	249	.ioctl = udf_ioctl,
	250	.open = generic_file_open,
	251	.mmap = generic_file_mmap,
	252	.write = do_sync_write,
	253	.aio_write = udf_file_aio_write,
	254	.release = udf_release_file,
	255	.fsync = udf_fsync_file,
	256	.splice_read = generic_file_splice_read,
1da177e4 LT	257	};
1da177e4 LT	258
c5ef1c42	259	const struct inode_operations udf_file_inode_operations = {
cb00ea35	260	.truncate = udf_truncate,
1da177e4	261	};