[PATCH 1/5] xfs: introduce inode cluster buffer trylocks for xfs_iflush

[Christoph Hellwig]

> +	 * pass through will see the stale flag set on the inode.
> +	 */
> +	error = xfs_iflush(ip, SYNC_TRYLOCK | sync_mode);
>  	if (sync_mode & SYNC_WAIT) {
> +		if (error == EAGAIN) {
> +			xfs_iunlock(ip, XFS_ILOCK_EXCL);
> +			/* backoff longer than in xfs_ifree_cluster */
> +			delay(2);

Do we really need the delay here?  It seems like we'd rather want to
keep going with scanning the next inode cluster and return here from
xfs_reclaim_inodes.

> diff --git a/fs/xfs/linux-2.6/xfs_sync.h b/fs/xfs/linux-2.6/xfs_sync.h
> index 32ba662..0ae48ff 100644
> --- a/fs/xfs/linux-2.6/xfs_sync.h
> +++ b/fs/xfs/linux-2.6/xfs_sync.h
> @@ -34,6 +34,7 @@ typedef struct xfs_sync_work {
>  
>  int xfs_syncd_init(struct xfs_mount *mp);
>  void xfs_syncd_stop(struct xfs_mount *mp);
> +void xfs_syncd_queue_sync(struct xfs_mount *mp, int flags);

This hunk belongs into a different patch.