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xfs: cleanup xfs_iunpin_wait/xfs_iunpin_nowait 

Remove the inode item pointer and ili_last_lsn checks in
__xfs_iunpin_wait as any pinned inode is guaranteed to have them
valid.  After this the xfs_iunpin_nowait case is nothing more than a
xfs_log_force_lsn, as we know that the caller has already checked
the pincount.

Make xfs_iunpin_nowait the new low-level routine just doing the log
force and rewrite xfs_iunpin_wait around it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2010-02-17 19:43:56 +00:00 committed by Alex Elder
parent d7658d487f
commit 60ec678371
1 changed files with 12 additions and 28 deletions
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40
fs/xfs/xfs_inode.c
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@ -2467,47 +2467,31 @@ xfs_iunpin(
}
/*
* This is called to unpin an inode. It can be directed to wait or to return
* immediately without waiting for the inode to be unpinned. The caller must
* have the inode locked in at least shared mode so that the buffer cannot be
* subsequently pinned once someone is waiting for it to be unpinned.
* This is called to unpin an inode. The caller must have the inode locked
* in at least shared mode so that the buffer cannot be subsequently pinned
* once someone is waiting for it to be unpinned.
*/
STATIC void
__xfs_iunpin_wait(
xfs_inode_t *ip,
int wait)
static void
xfs_iunpin_nowait(
struct xfs_inode *ip)
{
xfs_inode_log_item_t *iip = ip->i_itemp;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
if (atomic_read(&ip->i_pincount) == 0)
return;
/* Give the log a push to start the unpinning I/O */
if (iip && iip->ili_last_lsn)
xfs_log_force_lsn(ip->i_mount, iip->ili_last_lsn, 0);
else
xfs_log_force(ip->i_mount, 0);
xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0);
if (wait)
wait_event(ip->i_ipin_wait, (atomic_read(&ip->i_pincount) == 0));
}
void
xfs_iunpin_wait(
xfs_inode_t *ip)
struct xfs_inode *ip)
{
__xfs_iunpin_wait(ip, 1);
if (xfs_ipincount(ip)) {
xfs_iunpin_nowait(ip);
wait_event(ip->i_ipin_wait, (xfs_ipincount(ip) == 0));
}
}
static inline void
xfs_iunpin_nowait(
xfs_inode_t *ip)
{
__xfs_iunpin_wait(ip, 0);
}
/*
* xfs_iextents_copy()
*