linux-ext4 - [PATCH] ext4: check for EXT4_MB_HINT_NOPREALLOC is added in ext4_mb_use

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Date:	Wed, 7 Apr 2010 21:25:53 +0800
From:	jing zhang <zj.barak@...il.com>
To:	linux-ext4 <linux-ext4@...r.kernel.org>
Cc:	"Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger@....com>,
	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>,
	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH] ext4: check for EXT4_MB_HINT_NOPREALLOC is added in 
	ext4_mb_use_preallocated()

From: Jing Zhang <zj.barak@...il.com>

Date: Wed Apr 7 21:23:48     2010

Since preallocation may not be require by allocation request, check
for it in ext4_mb_use_preallocated() seems necessary.

Cc: Theodore Ts'o <tytso@....edu>
Cc: Andreas Dilger <adilger@....com>
Cc: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Cc: Aneesh Kumar K. V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: Jing Zhang <zj.barak@...il.com>

---

--- linux-2.6.32/fs/ext4/mballoc.c	2009-12-03 11:51:22.000000000 +0800
+++ ext4_mm_leak/mballoc-15.c	2010-04-07 20:16:22.000000000 +0800
@@ -3101,6 +3101,8 @@ ext4_mb_use_preallocated(struct ext4_all
 	/* only data can be preallocated */
 	if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
 		return 0;
+	if (ac->ac_flags & EXT4_MB_HINT_NOPREALLOC)
+		return 0;

 	/* first, try per-file preallocation */
 	rcu_read_lock();
--
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