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

[Dave Chinner <david@xxxxxxxxxxxxx>]

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@xxxxxxxxxxxxx>
---
 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