[XFS] propogate return codes from flush routines

This patch handles error return values in fs_flush_pages and
fs_flushinval_pages. It changes the prototype of fs_flushinval_pages so we
can propogate the errors and handle them at higher layers. I also modified
xfs_itruncate_start so that it could propogate the error further.

SGI-PV: 961990
SGI-Modid: xfs-linux-melb:xfs-kern:28231a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Stewart Smith <stewart@flamingspork.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 5ed349e..6e49bd3 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -1257,8 +1257,12 @@
 		 * do that within a transaction.
 		 */
 		xfs_ilock(ip, XFS_IOLOCK_EXCL);
-		xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
+		error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
 				    ip->i_d.di_size);
+		if (error) {
+			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+			return error;
+		}
 
 		error = xfs_trans_reserve(tp, 0,
 					  XFS_ITRUNCATE_LOG_RES(mp),
@@ -1674,7 +1678,11 @@
 		 */
 		xfs_ilock(ip, XFS_IOLOCK_EXCL);
 
-		xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
+		error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
+		if (error) {
+			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+			return VN_INACTIVE_CACHE;
+		}
 
 		error = xfs_trans_reserve(tp, 0,
 					  XFS_ITRUNCATE_LOG_RES(mp),
@@ -4338,8 +4346,10 @@
 	if (VN_CACHED(vp) != 0) {
 		xfs_inval_cached_trace(&ip->i_iocore, ioffset, -1,
 				ctooff(offtoct(ioffset)), -1);
-		bhv_vop_flushinval_pages(vp, ctooff(offtoct(ioffset)),
+		error = bhv_vop_flushinval_pages(vp, ctooff(offtoct(ioffset)),
 				-1, FI_REMAPF_LOCKED);
+		if (error)
+			goto out_unlock_iolock;
 	}
 
 	/*