From 2d8344658951da34d78fa0dfaa257c2fa9e73326 Mon Sep 17 00:00:00 2001
From: Eric Sandeen <sandeen@redhat.com>
Date: Mon, 16 Mar 2009 23:25:40 -0400
Subject: [PATCH] --- yaml --- r: 132435 b: refs/heads/master c:
 d33a1976fbee1ee321d6f014333d8f03a39d526c h: refs/heads/master i:   132433:
 3c59882398c2f70f36d812cfaaf42b6a02030ae6   132431:
 0d8e57ed32ce37f901d1962d344a8e39f8e489d6 v: v3

---
 [refs]                  | 2 +-
 trunk/fs/ext4/mballoc.c | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 6ef6a1636265..f0f67c9c5c34 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8d03c7a0c550e7ab24cadcef5e66656bfadec8b9
+refs/heads/master: d33a1976fbee1ee321d6f014333d8f03a39d526c
diff --git a/trunk/fs/ext4/mballoc.c b/trunk/fs/ext4/mballoc.c
index 41f4348b62f5..9f61e62f435f 100644
--- a/trunk/fs/ext4/mballoc.c
+++ b/trunk/fs/ext4/mballoc.c
@@ -3589,6 +3589,7 @@ static void ext4_mb_put_pa(struct ext4_allocation_context *ac,
 			struct super_block *sb, struct ext4_prealloc_space *pa)
 {
 	ext4_group_t grp;
+	ext4_fsblk_t grp_blk;
 
 	if (!atomic_dec_and_test(&pa->pa_count) || pa->pa_free != 0)
 		return;
@@ -3603,8 +3604,12 @@ static void ext4_mb_put_pa(struct ext4_allocation_context *ac,
 	pa->pa_deleted = 1;
 	spin_unlock(&pa->pa_lock);
 
-	/* -1 is to protect from crossing allocation group */
-	ext4_get_group_no_and_offset(sb, pa->pa_pstart - 1, &grp, NULL);
+	grp_blk = pa->pa_pstart;
+	/* If linear, pa_pstart may be in the next group when pa is used up */
+	if (pa->pa_linear)
+		grp_blk--;
+
+	ext4_get_group_no_and_offset(sb, grp_blk, &grp, NULL);
 
 	/*
 	 * possible race: