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[XFS] Start writeout earlier (on last close) in the case where we have a

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truncate down followed by delayed allocation (buffered writes) - worst
case scenario for the notorious NULL files problem.  This reduces the
window where we are exposed to that problem significantly.

SGI-PV: 917976
SGI-Modid: xfs-linux-melb:xfs-kern:26100a

Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Nathan Scott
2006-06-09 15:27:16 +10:00
parent 59c1b082f5
commit 7d4fb40ad7
5 changed files with 114 additions and 94 deletions
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53
fs/xfs/linux-2.6/xfs_fs_subr.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
* Copyright (c) 2000-2002,2005-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
@ -15,40 +15,12 @@
* 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"
/*
* Stub for no-op vnode operations that return error status.
*/
int
fs_noerr(void)
{
return 0;
}
int fs_noerr(void) { return 0; }
int fs_nosys(void) { return ENOSYS; }
void fs_noval(void) { return; }
/*
* Operation unsupported under this file system.
*/
int
fs_nosys(void)
{
return ENOSYS;
}
/*
* Stub for inactive, strategy, and read/write lock/unlock. Does nothing.
*/
/* ARGSUSED */
void
fs_noval(void)
{
}
/*
* vnode pcache layer for vnode_tosspages.
* 'last' parameter unused but left in for IRIX compatibility
*/
void
fs_tosspages(
bhv_desc_t *bdp,
@ -63,11 +35,6 @@ fs_tosspages(
truncate_inode_pages(ip->i_mapping, first);
}
/*
* vnode pcache layer for vnode_flushinval_pages.
* 'last' parameter unused but left in for IRIX compatibility
*/
void
fs_flushinval_pages(
bhv_desc_t *bdp,
@ -79,16 +46,13 @@ fs_flushinval_pages(
struct inode *ip = vn_to_inode(vp);
if (VN_CACHED(vp)) {
if (VN_TRUNC(vp))
VUNTRUNCATE(vp);
filemap_write_and_wait(ip->i_mapping);
truncate_inode_pages(ip->i_mapping, first);
}
}
/*
* vnode pcache layer for vnode_flush_pages.
* 'last' parameter unused but left in for IRIX compatibility
*/
int
fs_flush_pages(
bhv_desc_t *bdp,
@ -100,12 +64,13 @@ fs_flush_pages(
vnode_t *vp = BHV_TO_VNODE(bdp);
struct inode *ip = vn_to_inode(vp);
if (VN_CACHED(vp)) {
if (VN_DIRTY(vp)) {
if (VN_TRUNC(vp))
VUNTRUNCATE(vp);
filemap_fdatawrite(ip->i_mapping);
if (flags & XFS_B_ASYNC)
return 0;
filemap_fdatawait(ip->i_mapping);
}
return 0;
}