1 files changed, 36 insertions, 2 deletions

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index f35dba9bf1d9..de3a198f771e 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -42,6 +42,40 @@
 #include <linux/pagevec.h>
 #include <linux/writeback.h>
 
+
+/*
+ * Prime number of hash buckets since address is used as the key.
+ */
+#define NVSYNC          37
+#define to_ioend_wq(v)  (&xfs_ioend_wq[((unsigned long)v) % NVSYNC])
+static wait_queue_head_t xfs_ioend_wq[NVSYNC];
+
+void __init
+xfs_ioend_init(void)
+{
+        int i;
+
+        for (i = 0; i < NVSYNC; i++)
+                init_waitqueue_head(&xfs_ioend_wq[i]);
+}
+
+void
+xfs_ioend_wait(
+        xfs_inode_t     *ip)
+{
+        wait_queue_head_t *wq = to_ioend_wq(ip);
+
+        wait_event(*wq, (atomic_read(&ip->i_iocount) == 0));
+}
+
+STATIC void
+xfs_ioend_wake(
+        xfs_inode_t     *ip)
+{
+        if (atomic_dec_and_test(&ip->i_iocount))
+                wake_up(to_ioend_wq(ip));
+}
+
 STATIC void
 xfs_count_page_state(
         struct page             *page,
@@ -164,7 +198,7 @@ xfs_destroy_ioend(
                                       __FILE__, __LINE__);
         }
 
-        vn_iowake(ip);
+        xfs_ioend_wake(ip);
         mempool_free(ioend, xfs_ioend_pool);
 }
 
@@ -516,7 +550,7 @@ xfs_cancel_ioend(
                         unlock_buffer(bh);
                 } while ((bh = next_bh) != NULL);
 
-                vn_iowake(XFS_I(ioend->io_inode));
+                xfs_ioend_wake(XFS_I(ioend->io_inode));
                 mempool_free(ioend, xfs_ioend_pool);
         } while ((ioend = next) != NULL);
 }