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authorDave Chinner <dchinner@redhat.com>2010-07-20 17:53:25 +1000
committerAlex Elder <aelder@sgi.com>2010-07-26 13:16:48 -0500
commit2f11feabb19748c0ffa2eb82d438e8a91b9f6ea0 (patch)
tree02564de802ac344b7c2048ed10438443356bfce1 /fs/xfs/linux-2.6
parentec53d1dbb3ca960e7b552397613358ba1dbd12bd (diff)
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xfs: simplify and remove xfs_ireclaim
xfs_ireclaim has to get and put te pag structure because it is only called with the inode to reclaim. The one caller of this function already has a reference on the pag and a pointer to is, so move the radix tree delete to the caller and remove xfs_ireclaim completely. This avoids a xfs_perag_get/put on every inode being reclaimed. The overhead was noticed in a bug report at: https://bugzilla.kernel.org/show_bug.cgi?id=16348 Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Alex Elder <aelder@sgi.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/linux-2.6')
-rw-r--r--fs/xfs/linux-2.6/xfs_sync.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index 66cefb27438..dfcbd98d159 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -855,7 +855,36 @@ out:
reclaim:
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
- xfs_ireclaim(ip);
+
+ XFS_STATS_INC(xs_ig_reclaims);
+ /*
+ * Remove the inode from the per-AG radix tree.
+ *
+ * Because radix_tree_delete won't complain even if the item was never
+ * added to the tree assert that it's been there before to catch
+ * problems with the inode life time early on.
+ */
+ write_lock(&pag->pag_ici_lock);
+ if (!radix_tree_delete(&pag->pag_ici_root,
+ XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino)))
+ ASSERT(0);
+ write_unlock(&pag->pag_ici_lock);
+
+ /*
+ * Here we do an (almost) spurious inode lock in order to coordinate
+ * with inode cache radix tree lookups. This is because the lookup
+ * can reference the inodes in the cache without taking references.
+ *
+ * We make that OK here by ensuring that we wait until the inode is
+ * unlocked after the lookup before we go ahead and free it. We get
+ * both the ilock and the iolock because the code may need to drop the
+ * ilock one but will still hold the iolock.
+ */
+ xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ xfs_qm_dqdetach(ip);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+
+ xfs_inode_free(ip);
return error;
}