[linux-block.git] / fs / udf / file.c

/*
 * file.c
 *
 * PURPOSE
 *  File handling routines for the OSTA-UDF(tm) filesystem.
 *
 * CONTACTS
 *  E-mail regarding any portion of the Linux UDF file system should be
 *  directed to the development team mailing list (run by majordomo):
 *    linux_udf@hpesjro.fc.hp.com
 *
 * 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/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;
}

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_write(struct file * file, const char __user * buf,
	size_t count, loff_t *ppos)
{
	ssize_t retval;
	struct inode *inode = file->f_dentry->d_inode;
	int err, pos;

	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_write(file, buf, count, 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 ( permission(inode, MAY_READ, NULL) != 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;
}

struct file_operations udf_file_operations = {
	.read			= generic_file_read,
	.ioctl			= udf_ioctl,
	.open			= generic_file_open,
	.mmap			= generic_file_mmap,
	.write			= udf_file_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	*
	7	* CONTACTS
	8	* E-mail regarding any portion of the Linux UDF file system should be
	9	* directed to the development team mailing list (run by majordomo):
	10	* linux_udf@hpesjro.fc.hp.com
	11	*
	12	* COPYRIGHT
	13	* This file is distributed under the terms of the GNU General Public
	14	* License (GPL). Copies of the GPL can be obtained from:
	15	* ftp://prep.ai.mit.edu/pub/gnu/GPL
	16	* Each contributing author retains all rights to their own work.
	17	*
	18	* (C) 1998-1999 Dave Boynton
	19	* (C) 1998-2004 Ben Fennema
	20	* (C) 1999-2000 Stelias Computing Inc
	21	*
	22	* HISTORY
	23	*
	24	* 10/02/98 dgb Attempt to integrate into udf.o
	25	* 10/07/98 Switched to using generic_readpage, etc., like isofs
	26	* And it works!
	27	* 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
	28	* ICBTAG_FLAG_AD_IN_ICB.
	29	* 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
	30	* 05/12/99 Preliminary file write support
	31	*/
	32
	33	#include "udfdecl.h"
	34	#include <linux/fs.h>
	35	#include <linux/udf_fs.h>
	36	#include <asm/uaccess.h>
	37	#include <linux/kernel.h>
	38	#include <linux/string.h> /* memset */
	39	#include <linux/errno.h>
	40	#include <linux/smp_lock.h>
	41	#include <linux/pagemap.h>
	42	#include <linux/buffer_head.h>
	43
	44	#include "udf_i.h"
	45	#include "udf_sb.h"
	46
	47	static int udf_adinicb_readpage(struct file file, struct page page)
	48	{
	49	struct inode *inode = page->mapping->host;
	50	char *kaddr;
	51
cd7619d6	52	BUG_ON(!PageLocked(page));
1da177e4 LT	53
	54	kaddr = kmap(page);
	55	memset(kaddr, 0, PAGE_CACHE_SIZE);
	56	memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), inode->i_size);
	57	flush_dcache_page(page);
	58	SetPageUptodate(page);
	59	kunmap(page);
	60	unlock_page(page);
	61	return 0;
	62	}
	63
	64	static int udf_adinicb_writepage(struct page page, struct writeback_control wbc)
	65	{
	66	struct inode *inode = page->mapping->host;
	67	char *kaddr;
	68
cd7619d6	69	BUG_ON(!PageLocked(page));
1da177e4 LT	70
	71	kaddr = kmap(page);
	72	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), kaddr, inode->i_size);
	73	mark_inode_dirty(inode);
	74	SetPageUptodate(page);
	75	kunmap(page);
	76	unlock_page(page);
	77	return 0;
	78	}
	79
	80	static int udf_adinicb_prepare_write(struct file file, struct page page, unsigned offset, unsigned to)
	81	{
	82	kmap(page);
	83	return 0;
	84	}
	85
	86	static int udf_adinicb_commit_write(struct file file, struct page page, unsigned offset, unsigned to)
	87	{
	88	struct inode *inode = page->mapping->host;
	89	char *kaddr = page_address(page);
	90
	91	memcpy(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset,
	92	kaddr + offset, to - offset);
	93	mark_inode_dirty(inode);
	94	SetPageUptodate(page);
	95	kunmap(page);
	96	/* only one page here */
	97	if (to > inode->i_size)
	98	inode->i_size = to;
	99	return 0;
	100	}
	101
	102	struct address_space_operations udf_adinicb_aops = {
	103	.readpage = udf_adinicb_readpage,
	104	.writepage = udf_adinicb_writepage,
	105	.sync_page = block_sync_page,
	106	.prepare_write = udf_adinicb_prepare_write,
	107	.commit_write = udf_adinicb_commit_write,
	108	};
	109
	110	static ssize_t udf_file_write(struct file * file, const char __user * buf,
	111	size_t count, loff_t *ppos)
	112	{
	113	ssize_t retval;
	114	struct inode *inode = file->f_dentry->d_inode;
	115	int err, pos;
	116
	117	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
	118	{
	119	if (file->f_flags & O_APPEND)
	120	pos = inode->i_size;
	121	else
	122	pos = *ppos;
	123
	124	if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
	125	pos + count))
	126	{
	127	udf_expand_file_adinicb(inode, pos + count, &err);
	128	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
	129	{
	130	udf_debug("udf_expand_adinicb: err=%d\n", err);
	131	return err;
	132	}
	133	}
134	else
135	{
136	if (pos + count > inode->i_size)
137	UDF_I_LENALLOC(inode) = pos + count;
138	else
139	UDF_I_LENALLOC(inode) = inode->i_size;
140	}
141	}
142
143	retval = generic_file_write(file, buf, count, ppos);
144
145	if (retval > 0)
146	mark_inode_dirty(inode);
147	return retval;
148	}
149
150	/*
151	* udf_ioctl
152	*
153	* PURPOSE
154	* Issue an ioctl.
155	*
156	* DESCRIPTION
157	* Optional - sys_ioctl() will return -ENOTTY if this routine is not
158	* available, and the ioctl cannot be handled without filesystem help.
159	*
160	* sys_ioctl() handles these ioctls that apply only to regular files:
161	* FIBMAP [requires udf_block_map()], FIGETBSZ, FIONREAD
162	* These ioctls are also handled by sys_ioctl():
163	* FIOCLEX, FIONCLEX, FIONBIO, FIOASYNC
164	* All other ioctls are passed to the filesystem.
165	*
166	* Refer to sys_ioctl() in fs/ioctl.c
167	* sys_ioctl() -> .
168	*
169	* PRE-CONDITIONS
170	* inode Pointer to inode that ioctl was issued on.
171	* filp Pointer to file that ioctl was issued on.
172	* cmd The ioctl command.
173	* arg The ioctl argument [can be interpreted as a
174	* user-space pointer if desired].
175	*
176	* POST-CONDITIONS
177	* <return> Success (>=0) or an error code (<=0) that
178	* sys_ioctl() will return.
179	*
180	* HISTORY
181	* July 1, 1997 - Andrew E. Mileski
182	* Written, tested, and released.
183	*/
184	int udf_ioctl(struct inode inode, struct file filp, unsigned int cmd,
185	unsigned long arg)
186	{
187	int result = -EINVAL;
188
189	if ( permission(inode, MAY_READ, NULL) != 0 )
190	{
191	udf_debug("no permission to access inode %lu\n",
192	inode->i_ino);
193	return -EPERM;
194	}
195
196	if ( !arg )
197	{
198	udf_debug("invalid argument to udf_ioctl\n");
199	return -EINVAL;
200	}
201
202	switch (cmd)
203	{
204	case UDF_GETVOLIDENT:
205	return copy_to_user((char __user *)arg,
206	UDF_SB_VOLIDENT(inode->i_sb), 32) ? -EFAULT : 0;
207	case UDF_RELOCATE_BLOCKS:
208	{
209	long old, new;
210
211	if (!capable(CAP_SYS_ADMIN)) return -EACCES;
212	if (get_user(old, (long __user *)arg)) return -EFAULT;
213	if ((result = udf_relocate_blocks(inode->i_sb,
214	old, &new)) == 0)
215	result = put_user(new, (long __user *)arg);
216
217	return result;
218	}
219	case UDF_GETEASIZE:
220	result = put_user(UDF_I_LENEATTR(inode), (int __user *)arg);
221	break;
222
223	case UDF_GETEABLOCK:
224	result = copy_to_user((char __user *)arg, UDF_I_DATA(inode),
225	UDF_I_LENEATTR(inode)) ? -EFAULT : 0;
226	break;
227	}
228
229	return result;
230	}
231
232	/*
233	* udf_release_file
234	*
235	* PURPOSE
236	* Called when all references to the file are closed
237	*
238	* DESCRIPTION
239	* Discard prealloced blocks
240	*
241	* HISTORY
242	*
243	*/
244	static int udf_release_file(struct inode * inode, struct file * filp)
245	{
246	if (filp->f_mode & FMODE_WRITE)
247	{
248	lock_kernel();
249	udf_discard_prealloc(inode);
250	unlock_kernel();
251	}
252	return 0;
253	}
254
255	struct file_operations udf_file_operations = {
256	.read = generic_file_read,
257	.ioctl = udf_ioctl,
258	.open = generic_file_open,
259	.mmap = generic_file_mmap,
260	.write = udf_file_write,
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	};