From b9b984d7846e37c57e5b3f8cd883ad45e8ebc2cf Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Sun, 18 Sep 2011 20:40:42 +0000
Subject: xfs: remove impossible to read code in xfs_bmap_add_extent_delay_real

We already have the worst case blocks reserved, so xfs_icsb_modify_counters
won't fail in xfs_bmap_add_extent_delay_real.  In fact we've had an assert
to catch this case since day and it never triggered.  So remove the code
to try smaller reservations, and just return the error for that case in
addition to keeping the assert.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 927e545..ebcd38b 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -1045,34 +1045,15 @@ xfs_bmap_add_extent_delay_real(
 		temp2 = xfs_bmap_worst_indlen(ip, temp2);
 		diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
 			(cur ? cur->bc_private.b.allocated : 0));
-		if (diff > 0 &&
-		    xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
-					     -((int64_t)diff), 0)) {
-			/*
-			 * Ick gross gag me with a spoon.
-			 */
-			ASSERT(0);	/* want to see if this ever happens! */
-			while (diff > 0) {
-				if (temp) {
-					temp--;
-					diff--;
-					if (!diff ||
-					    !xfs_icsb_modify_counters(ip->i_mount,
-						    XFS_SBS_FDBLOCKS,
-						    -((int64_t)diff), 0))
-						break;
-				}
-				if (temp2) {
-					temp2--;
-					diff--;
-					if (!diff ||
-					    !xfs_icsb_modify_counters(ip->i_mount,
-						    XFS_SBS_FDBLOCKS,
-						    -((int64_t)diff), 0))
-						break;
-				}
-			}
+		if (diff > 0) {
+			error = xfs_icsb_modify_counters(ip->i_mount,
+					XFS_SBS_FDBLOCKS,
+					-((int64_t)diff), 0);
+			ASSERT(!error);
+			if (error)
+				goto done;
 		}
+
 		ep = xfs_iext_get_ext(ifp, *idx);
 		xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
 		trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
-- 
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