/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_attr.h"
#include "xfs_inode_item.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_iomap.h"
#include "xfs_vnodeops.h"
#include <linux/capability.h>
#include <linux/writeback.h>
#if defined(XFS_RW_TRACE)
void
xfs_rw_enter_trace(
int tag,
xfs_inode_t *ip,
void *data,
size_t segs,
loff_t offset,
int ioflags)
{
if (ip->i_rwtrace == NULL)
return;
ktrace_enter(ip->i_rwtrace,
(void *)(unsigned long)tag,
(void *)ip,
(void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
(void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
(void *)data,
(void *)((unsigned long)segs),
(void *)((unsigned long)((offset >> 32) & 0xffffffff)),
(void *)((unsigned long)(offset & 0xffffffff)),
(void *)((unsigned long)ioflags),
(void *)((unsigned long)((ip->i_new_size >> 32) & 0xffffffff)),
(void *)((unsigned long)(ip->i_new_size & 0xffffffff)),
(void *)((unsigned long)current_pid()),
(void *)NULL,
(void *)NULL,
(void *)NULL,
(void *)NULL);
}
void
xfs_inval_cached_trace(
xfs_inode_t *ip,
xfs_off_t offset,
xfs_off_t len,
xfs_off_t first,
xfs_off_t last)
{
if (ip->i_rwtrace == NULL)
return;
ktrace_enter(ip->i_rwtrace,
(void *)(__psint_t)XFS_INVAL_CACHED,
(void *)ip,
(void *)((unsigned long)((offset >> 32) & 0xffffffff)),
(void *)((unsigned long)(offset & 0xffffffff)),
(void *)((unsigned long)((len >> 32) & 0xffffffff)),
(void *)((unsigned long)(len & 0xffffffff)),
(void *)((unsigned long)((first >> 32) & 0xffffffff)),
(void *)((unsigned long)(first & 0xffffffff)),
(void *)((unsigned long)((last >> 32) & 0xffffffff)),
(void *)((unsigned long)(last & 0xffffffff)),
(void *)((unsigned long)current_pid()),
(void *)NULL,
(void *)NULL,
(void *)NULL,
(void *)NULL,
(void *)NULL);
}
#endif
/*
* xfs_iozero
*
* xfs_iozero clears the specified range of buffer supplied,
* and marks all the affected blocks as valid and modified. If
* an affected block is not allocated, it will be allocated. If
* an affected block is not completely overwritten, and is not
* valid before the operation, it will be read from disk before
* being partially zeroed.
*/
STATIC int
xfs_iozero(
struct xfs_inode *ip, /* inode */
loff_t pos, /* offset in file */
size_t count) /* size of data to zero */
{
struct page *page;
struct address_space *mapping;
int status;
mapping = VFS_I(ip)->i_mapping;
do {
unsigned offset, bytes;
void *fsdata;
offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
bytes = PAGE_CACHE_SIZE - offset;
if (bytes > count)
bytes = count;
status = pagecache_write_begin(NULL, mapping, pos, bytes,
AOP_FLAG_UNINTERRUPTIBLE,
&page, &fsdata);
if (status)
break;
zero_user(page, offset, bytes);
status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
page, fsdata);
WARN_ON(status <= 0); /* can't return less than zero! */