1 files changed, 24 insertions, 1 deletions

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 401cb00a55d6..1a5ad8cd97b0 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -589,7 +589,30 @@ xfs_setattr(
                         code = xfs_igrow_start(ip, vap->va_size, credp);
                 }
                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
-                vn_iowait(vp); /* wait for the completion of any pending DIOs */
+
+                /*
+                 * We are going to log the inode size change in this
+                 * transaction so any previous writes that are beyond the on
+                 * disk EOF and the new EOF that have not been written out need
+                 * to be written here. If we do not write the data out, we
+                 * expose ourselves to the null files problem.
+                 *
+                 * Only flush from the on disk size to the smaller of the in
+                 * memory file size or the new size as that's the range we
+                 * really care about here and prevents waiting for other data
+                 * not within the range we care about here.
+                 */
+                if (!code &&
+                    (ip->i_size != ip->i_d.di_size) &&
+                    (vap->va_size > ip->i_d.di_size)) {
+                        code = bhv_vop_flush_pages(XFS_ITOV(ip),
+                                        ip->i_d.di_size, vap->va_size,
+                                        XFS_B_ASYNC, FI_NONE);
+                }
+
+                /* wait for all I/O to complete */
+                vn_iowait(vp);
+
                 if (!code)
                         code = xfs_itruncate_data(ip, vap->va_size);
                 if (code) {