[GitHub/mt8127/android_kernel_alcatel_ttab.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 "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;
}

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

	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,
	.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			= simple_fsync,
	.splice_read		= generic_file_splice_read,
	.llseek			= generic_file_llseek,
};

static 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 (iattr->ia_valid & ATTR_SIZE)
		vfs_dq_init(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>
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;
48d6d8ff	48	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	49
cd7619d6	50	BUG_ON(!PageLocked(page));
1da177e4 LT	51
	52	kaddr = kmap(page);
	53	memset(kaddr, 0, PAGE_CACHE_SIZE);
48d6d8ff	54	memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
1da177e4 LT	55	flush_dcache_page(page);
	56	SetPageUptodate(page);
	57	kunmap(page);
	58	unlock_page(page);
28de7948	59
1da177e4 LT	60	return 0;
	61	}
	62
4b11111a MS	63	static int udf_adinicb_writepage(struct page *page,
4b11111a MS	64	struct writeback_control *wbc)
1da177e4 LT	65	{
	66	struct inode *inode = page->mapping->host;
	67	char *kaddr;
48d6d8ff	68	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	69
cd7619d6	70	BUG_ON(!PageLocked(page));
1da177e4 LT	71
1da177e4 LT	72	kaddr = kmap(page);
48d6d8ff	73	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
1da177e4 LT	74	mark_inode_dirty(inode);
	75	SetPageUptodate(page);
	76	kunmap(page);
	77	unlock_page(page);
28de7948	78
1da177e4 LT	79	return 0;
	80	}
	81
be021ee4 NP	82	static int udf_adinicb_write_end(struct file *file,
	83	struct address_space *mapping,
	84	loff_t pos, unsigned len, unsigned copied,
	85	struct page page, void fsdata)
1da177e4	86	{
be021ee4 NP	87	struct inode *inode = mapping->host;
	88	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
	89	char *kaddr;
48d6d8ff	90	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	91
be021ee4	92	kaddr = kmap_atomic(page, KM_USER0);
48d6d8ff	93	memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
be021ee4 NP	94	kaddr + offset, copied);
	95	kunmap_atomic(kaddr, KM_USER0);
	96
	97	return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
1da177e4 LT	98	}
1da177e4 LT	99
f5e54d6e	100	const struct address_space_operations udf_adinicb_aops = {
28de7948 CG	101	.readpage = udf_adinicb_readpage,
	102	.writepage = udf_adinicb_writepage,
	103	.sync_page = block_sync_page,
be021ee4 NP	104	.write_begin = simple_write_begin,
be021ee4 NP	105	.write_end = udf_adinicb_write_end,
1da177e4 LT	106	};
1da177e4 LT	107
543ade1f	108	static ssize_t udf_file_aio_write(struct kiocb iocb, const struct iovec iov,
cb00ea35	109	unsigned long nr_segs, loff_t ppos)
1da177e4 LT	110	{
1da177e4 LT	111	ssize_t retval;
543ade1f	112	struct file *file = iocb->ki_filp;
5096e933	113	struct inode *inode = file->f_path.dentry->d_inode;
1da177e4	114	int err, pos;
543ade1f	115	size_t count = iocb->ki_left;
48d6d8ff	116	struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4	117
48d6d8ff	118	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1da177e4 LT	119	if (file->f_flags & O_APPEND)
	120	pos = inode->i_size;
	121	else
543ade1f	122	pos = ppos;
1da177e4	123
4b11111a MS	124	if (inode->i_sb->s_blocksize <
4b11111a MS	125	(udf_file_entry_alloc_offset(inode) +
28de7948	126	pos + count)) {
1da177e4	127	udf_expand_file_adinicb(inode, pos + count, &err);
48d6d8ff	128	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1da177e4 LT	129	udf_debug("udf_expand_adinicb: err=%d\n", err);
	130	return err;
	131	}
cb00ea35	132	} else {
1da177e4	133	if (pos + count > inode->i_size)
48d6d8ff	134	iinfo->i_lenAlloc = pos + count;
1da177e4	135	else
48d6d8ff	136	iinfo->i_lenAlloc = inode->i_size;
1da177e4 LT	137	}
	138	}
	139
543ade1f	140	retval = generic_file_aio_write(iocb, iov, nr_segs, ppos);
1da177e4 LT	141	if (retval > 0)
1da177e4 LT	142	mark_inode_dirty(inode);
28de7948	143
1da177e4 LT	144	return retval;
	145	}
	146
1da177e4	147	int udf_ioctl(struct inode inode, struct file filp, unsigned int cmd,
cb00ea35	148	unsigned long arg)
1da177e4	149	{
28de7948	150	long old_block, new_block;
1da177e4 LT	151	int result = -EINVAL;
1da177e4 LT	152
cb00ea35	153	if (file_permission(filp, MAY_READ) != 0) {
28de7948 CG	154	udf_debug("no permission to access inode %lu\n",
28de7948 CG	155	inode->i_ino);
1da177e4 LT	156	return -EPERM;
	157	}
	158
cb00ea35	159	if (!arg) {
1da177e4 LT	160	udf_debug("invalid argument to udf_ioctl\n");
	161	return -EINVAL;
	162	}
	163
cb00ea35 CG	164	switch (cmd) {
cb00ea35 CG	165	case UDF_GETVOLIDENT:
4b11111a MS	166	if (copy_to_user((char __user *)arg,
	167	UDF_SB(inode->i_sb)->s_volume_ident, 32))
	168	return -EFAULT;
	169	else
	170	return 0;
cb00ea35	171	case UDF_RELOCATE_BLOCKS:
28de7948 CG	172	if (!capable(CAP_SYS_ADMIN))
	173	return -EACCES;
	174	if (get_user(old_block, (long __user *)arg))
	175	return -EFAULT;
4b11111a MS	176	result = udf_relocate_blocks(inode->i_sb,
	177	old_block, &new_block);
	178	if (result == 0)
28de7948 CG	179	result = put_user(new_block, (long __user *)arg);
28de7948 CG	180	return result;
cb00ea35	181	case UDF_GETEASIZE:
c0b34438	182	result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
cb00ea35	183	break;
cb00ea35	184	case UDF_GETEABLOCK:
c0b34438 MS	185	result = copy_to_user((char __user *)arg,
	186	UDF_I(inode)->i_ext.i_data,
	187	UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
cb00ea35	188	break;
1da177e4 LT	189	}
	190
	191	return result;
	192	}
	193
cb00ea35	194	static int udf_release_file(struct inode inode, struct file filp)
1da177e4	195	{
cb00ea35	196	if (filp->f_mode & FMODE_WRITE) {
cbc8cc33	197	mutex_lock(&inode->i_mutex);
1da177e4 LT	198	lock_kernel();
1da177e4 LT	199	udf_discard_prealloc(inode);
2c948b3f	200	udf_truncate_tail_extent(inode);
1da177e4	201	unlock_kernel();
cbc8cc33	202	mutex_unlock(&inode->i_mutex);
1da177e4 LT	203	}
	204	return 0;
	205	}
	206
4b6f5d20	207	const struct file_operations udf_file_operations = {
28de7948 CG	208	.read = do_sync_read,
	209	.aio_read = generic_file_aio_read,
	210	.ioctl = udf_ioctl,
907f4554	211	.open = dquot_file_open,
28de7948 CG	212	.mmap = generic_file_mmap,
	213	.write = do_sync_write,
	214	.aio_write = udf_file_aio_write,
	215	.release = udf_release_file,
90de0664	216	.fsync = simple_fsync,
28de7948	217	.splice_read = generic_file_splice_read,
5c89468c	218	.llseek = generic_file_llseek,
1da177e4 LT	219	};
1da177e4 LT	220
759bfee6 CH	221	static int udf_setattr(struct dentry dentry, struct iattr iattr)
	222	{
	223	struct inode *inode = dentry->d_inode;
	224	int error;
	225
	226	error = inode_change_ok(inode, iattr);
	227	if (error)
	228	return error;
	229
907f4554 CH	230	if (iattr->ia_valid & ATTR_SIZE)
	231	vfs_dq_init(inode);
	232
759bfee6 CH	233	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) \|\|
759bfee6 CH	234	(iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
b43fa828	235	error = dquot_transfer(inode, iattr);
759bfee6 CH	236	if (error)
	237	return error;
	238	}
	239
	240	return inode_setattr(inode, iattr);
	241	}
	242
c5ef1c42	243	const struct inode_operations udf_file_inode_operations = {
759bfee6 CH	244	.truncate = udf_truncate,
759bfee6 CH	245	.setattr = udf_setattr,
1da177e4	246	};