[XFS] add infrastructure for waiting on I/O completion at inode reclaim

time

SGI-PV: 934766
SGI-Modid: xfs-linux:xfs-kern:196854a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 2 insertions, 9 deletions

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index bd9aba1f2353..b55cb7f02e88 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -139,7 +139,7 @@ linvfs_unwritten_convert(
         XFS_BUF_SET_FSPRIVATE(bp, NULL);
         XFS_BUF_CLR_IODONE_FUNC(bp);
         XFS_BUF_UNDATAIO(bp);
-        iput(LINVFS_GET_IP(vp));
+        vn_iowake(vp);
         pagebuf_iodone(bp, 0, 0);
 }
 
@@ -448,14 +448,7 @@ xfs_map_unwritten(
         if (!pb)
                 return -EAGAIN;
 
-        /* Take a reference to the inode to prevent it from
-         * being reclaimed while we have outstanding unwritten
-         * extent IO on it.
-         */
-        if ((igrab(inode)) != inode) {
-                pagebuf_free(pb);
-                return -EAGAIN;
-        }
+        atomic_inc(&LINVFS_GET_VP(inode)->v_iocount);
 
         /* Set the count to 1 initially, this will stop an I/O
          * completion callout which happens before we have started