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xfs: only issues a cache flush on unmount if barriers are enabled

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Currently we unconditionally issue a flush from xfs_free_buftarg, but
since 2.6.29-rc1 this gives a warning in the style of

	end_request: I/O error, dev vdb, sector 0

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Felix Blyakher <felixb@sgi.com>
This commit is contained in:
Christoph Hellwig
2009-03-03 14:48:37 -05:00
committed by Felix Blyakher
parent ed93ec3907
commit b79631330a
3 changed files with 16 additions and 8 deletions
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12
fs/xfs/linux-2.6/xfs_buf.c
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@@ -34,6 +34,12 @@
#include <linux/backing-dev.h>
#include <linux/freezer.h>
#include "xfs_sb.h"
#include "xfs_inum.h"
#include "xfs_ag.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
static kmem_zone_t *xfs_buf_zone;
STATIC int xfsbufd(void *);
STATIC int xfsbufd_wakeup(int, gfp_t);
@@ -1435,10 +1441,12 @@ xfs_unregister_buftarg(
void
xfs_free_buftarg(
xfs_buftarg_t *btp)
struct xfs_mount *mp,
struct xfs_buftarg *btp)
{
xfs_flush_buftarg(btp, 1);
xfs_blkdev_issue_flush(btp);
if (mp->m_flags & XFS_MOUNT_BARRIER)
xfs_blkdev_issue_flush(btp);
xfs_free_bufhash(btp);
iput(btp->bt_mapping->host);