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Commit 545c0889 authored by Dave Chinner's avatar Dave Chinner Committed by Dave Chinner
Browse files

xfs: simplify inode reclaim tagging interfaces 



Inode radix tree tagging for reclaim passes a lot of unnecessary
variables around. Over time the xfs-perag has grown a xfs_mount
backpointer, and an internal agno so we don't need to pass other
variables into the tagging functions to supply this information.

Rework the functions to pass the minimal variable set required
and simplify the internal logic and flow.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent 19429363

fs/xfs/xfs_icache.c

+50 −48
Original line number Diff line number Diff line
@@ -37,8 +37,7 @@ 
#include <linux/kthread.h>

#include <linux/freezer.h>



STATIC void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp,

				struct xfs_perag *pag, struct xfs_inode *ip);

STATIC void xfs_inode_clear_reclaim_tag(struct xfs_perag *pag, xfs_ino_t ino);



/*

 * Allocate and initialise an xfs_inode.
@@ -271,7 +270,7 @@ xfs_iget_cache_hit( 
		 */

		ip->i_flags &= ~XFS_IRECLAIM_RESET_FLAGS;

		ip->i_flags |= XFS_INEW;

		__xfs_inode_clear_reclaim_tag(mp, pag, ip);

		xfs_inode_clear_reclaim_tag(pag, ip->i_ino);

		inode->i_state = I_NEW;



		ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
@@ -768,30 +767,46 @@ xfs_reclaim_worker( 
}



static void

__xfs_inode_set_reclaim_tag(

	struct xfs_perag	*pag,

	struct xfs_inode	*ip)

xfs_perag_set_reclaim_tag(

	struct xfs_perag	*pag)

{

	radix_tree_tag_set(&pag->pag_ici_root,

			   XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),

			   XFS_ICI_RECLAIM_TAG);

	struct xfs_mount	*mp = pag->pag_mount;



	ASSERT(spin_is_locked(&pag->pag_ici_lock));

	if (pag->pag_ici_reclaimable++)

		return;



	if (!pag->pag_ici_reclaimable) {

	/* propagate the reclaim tag up into the perag radix tree */

		spin_lock(&ip->i_mount->m_perag_lock);

		radix_tree_tag_set(&ip->i_mount->m_perag_tree, pag->pag_agno,

	spin_lock(&mp->m_perag_lock);

	radix_tree_tag_set(&mp->m_perag_tree, pag->pag_agno,

			   XFS_ICI_RECLAIM_TAG);

		spin_unlock(&ip->i_mount->m_perag_lock);

	spin_unlock(&mp->m_perag_lock);



	/* schedule periodic background inode reclaim */

		xfs_reclaim_work_queue(ip->i_mount);

	xfs_reclaim_work_queue(mp);



		trace_xfs_perag_set_reclaim(ip->i_mount, pag->pag_agno,

							-1, _RET_IP_);

	trace_xfs_perag_set_reclaim(mp, pag->pag_agno, -1, _RET_IP_);

}

	pag->pag_ici_reclaimable++;



static void

xfs_perag_clear_reclaim_tag(

	struct xfs_perag	*pag)

{

	struct xfs_mount	*mp = pag->pag_mount;



	ASSERT(spin_is_locked(&pag->pag_ici_lock));

	if (--pag->pag_ici_reclaimable)

		return;



	/* clear the reclaim tag from the perag radix tree */

	spin_lock(&mp->m_perag_lock);

	radix_tree_tag_clear(&mp->m_perag_tree, pag->pag_agno,

			     XFS_ICI_RECLAIM_TAG);

	spin_unlock(&mp->m_perag_lock);

	trace_xfs_perag_clear_reclaim(mp, pag->pag_agno, -1, _RET_IP_);

}





/*

 * We set the inode flag atomically with the radix tree tag.

 * Once we get tag lookups on the radix tree, this inode flag
@@ -799,7 +814,7 @@ __xfs_inode_set_reclaim_tag( 
 */

void

xfs_inode_set_reclaim_tag(

	xfs_inode_t	*ip)

	struct xfs_inode	*ip)

{

	struct xfs_mount	*mp = ip->i_mount;

	struct xfs_perag	*pag;
@@ -807,39 +822,26 @@ xfs_inode_set_reclaim_tag( 
	pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));

	spin_lock(&pag->pag_ici_lock);

	spin_lock(&ip->i_flags_lock);

	__xfs_inode_set_reclaim_tag(pag, ip);



	radix_tree_tag_set(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino),

			   XFS_ICI_RECLAIM_TAG);

	xfs_perag_set_reclaim_tag(pag);

	__xfs_iflags_set(ip, XFS_IRECLAIMABLE);



	spin_unlock(&ip->i_flags_lock);

	spin_unlock(&pag->pag_ici_lock);

	xfs_perag_put(pag);

}



STATIC void

__xfs_inode_clear_reclaim(

	xfs_perag_t	*pag,

	xfs_inode_t	*ip)

{

	pag->pag_ici_reclaimable--;

	if (!pag->pag_ici_reclaimable) {

		/* clear the reclaim tag from the perag radix tree */

		spin_lock(&ip->i_mount->m_perag_lock);

		radix_tree_tag_clear(&ip->i_mount->m_perag_tree, pag->pag_agno,

				XFS_ICI_RECLAIM_TAG);

		spin_unlock(&ip->i_mount->m_perag_lock);

		trace_xfs_perag_clear_reclaim(ip->i_mount, pag->pag_agno,

							-1, _RET_IP_);

	}

}



STATIC void

__xfs_inode_clear_reclaim_tag(

	xfs_mount_t	*mp,

	xfs_perag_t	*pag,

	xfs_inode_t	*ip)

xfs_inode_clear_reclaim_tag(

	struct xfs_perag	*pag,

	xfs_ino_t		ino)

{

	radix_tree_tag_clear(&pag->pag_ici_root,

			XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);

	__xfs_inode_clear_reclaim(pag, ip);

			     XFS_INO_TO_AGINO(pag->pag_mount, ino),

			     XFS_ICI_RECLAIM_TAG);

	xfs_perag_clear_reclaim_tag(pag);

}



/*
@@ -1030,7 +1032,7 @@ xfs_reclaim_inode( 
	if (!radix_tree_delete(&pag->pag_ici_root,

				XFS_INO_TO_AGINO(ip->i_mount, ino)))

		ASSERT(0);

	__xfs_inode_clear_reclaim(pag, ip);

	xfs_perag_clear_reclaim_tag(pag);

	spin_unlock(&pag->pag_ici_lock);



	/*