From: Jing Zhang <zj.barak@gmail.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@mit.edu>
Cc: Andreas Dilger <adilger@sun.com>
Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: Aneesh Kumar K. V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Jing Zhang <zj.barak@gmail.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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