[PATCH 2/6] XFS: mark inodes for reclaim via a tag in the inode radix tree

[Dave Chinner <david@fromorbit.com>]

Prepare for removing the deleted inode list by marking inodes
for reclaim in the inode radix trees so that we can use the
radix trees to find reclaimable inodes.

Signed-off-by: Dave Chinner <david@fromorbit.com>
---
 fs/xfs/linux-2.6/xfs_sync.c |   41 +++++++++++++++++++++++++++++++++++++++++
 fs/xfs/linux-2.6/xfs_sync.h |    4 ++++
 fs/xfs/xfs_ag.h             |    5 +++++
 fs/xfs/xfs_iget.c           |    3 +++
 fs/xfs/xfs_vnodeops.c       |    1 +
 5 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index e6363c0..b01748c 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -644,6 +644,47 @@ xfs_finish_reclaim(
 	return 0;
 }
 
+void
+xfs_inode_set_reclaim_tag(
+	xfs_inode_t	*ip)
+{
+	xfs_mount_t	*mp = ip->i_mount;
+	xfs_perag_t	*pag = xfs_get_perag(mp, ip->i_ino);
+
+	read_lock(&pag->pag_ici_lock);
+	spin_lock(&ip->i_flags_lock);
+	radix_tree_tag_set(&pag->pag_ici_root,
+			XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);
+	spin_unlock(&ip->i_flags_lock);
+	read_unlock(&pag->pag_ici_lock);
+	xfs_put_perag(mp, pag);
+}
+
+void
+__xfs_inode_clear_reclaim_tag(
+	xfs_mount_t	*mp,
+	xfs_perag_t	*pag,
+	xfs_inode_t	*ip)
+{
+	radix_tree_tag_clear(&pag->pag_ici_root,
+			XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);
+}
+
+void
+xfs_inode_clear_reclaim_tag(
+	xfs_inode_t	*ip)
+{
+	xfs_mount_t	*mp = ip->i_mount;
+	xfs_perag_t	*pag = xfs_get_perag(mp, ip->i_ino);
+
+	read_lock(&pag->pag_ici_lock);
+	spin_lock(&ip->i_flags_lock);
+	__xfs_inode_clear_reclaim_tag(mp, pag, ip);
+	spin_unlock(&ip->i_flags_lock);
+	read_unlock(&pag->pag_ici_lock);
+	xfs_put_perag(mp, pag);
+}
+
 int
 xfs_finish_reclaim_all(
 	xfs_mount_t	*mp,
diff --git a/fs/xfs/linux-2.6/xfs_sync.h b/fs/xfs/linux-2.6/xfs_sync.h
index 23117a1..fcaf004 100644
--- a/fs/xfs/linux-2.6/xfs_sync.h
+++ b/fs/xfs/linux-2.6/xfs_sync.h
@@ -48,4 +48,8 @@ void xfs_flush_device(struct xfs_inode *ip);
 int xfs_finish_reclaim(struct xfs_inode *ip, int locked, int sync_mode);
 int xfs_finish_reclaim_all(struct xfs_mount *mp, int noblock, int mode);
 
+void xfs_inode_set_reclaim_tag(struct xfs_inode *ip);
+void xfs_inode_clear_reclaim_tag(struct xfs_inode *ip);
+void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
+				struct xfs_inode *ip);
 #endif
diff --git a/fs/xfs/xfs_ag.h b/fs/xfs/xfs_ag.h
index 61b292a..426e438 100644
--- a/fs/xfs/xfs_ag.h
+++ b/fs/xfs/xfs_ag.h
@@ -203,6 +203,11 @@ typedef struct xfs_perag
 	struct radix_tree_root pag_ici_root;	/* incore inode cache root */
 } xfs_perag_t;
 
+/*
+ * tags for inode radix tree
+ */
+#define XFS_ICI_RECLAIM_TAG	0	/* inode is to be reclaimed */
+
 #define	XFS_AG_MAXLEVELS(mp)		((mp)->m_ag_maxlevels)
 #define	XFS_MIN_FREELIST_RAW(bl,cl,mp)	\
 	(MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
index 533a375..24a74d6 100644
--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -91,6 +91,9 @@ xfs_iget_cache_hit(
 		}
 		xfs_iflags_set(ip, XFS_INEW);
 		xfs_iflags_clear(ip, XFS_IRECLAIMABLE);
+
+		/* clear the radix tree reclaim flag as well. */
+		__xfs_inode_clear_reclaim_tag(mp, pag, ip);
 		read_unlock(&pag->pag_ici_lock);
 
 		XFS_MOUNT_ILOCK(mp);
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 02ee432..e5393f3 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -2812,6 +2812,7 @@ xfs_reclaim(
 		spin_unlock(&ip->i_flags_lock);
 		list_add_tail(&ip->i_reclaim, &mp->m_del_inodes);
 		XFS_MOUNT_IUNLOCK(mp);
+		xfs_inode_set_reclaim_tag(ip);
 	}
 	return 0;
 }
-- 
1.5.6