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authorChristoph Lameter <clameter@sgi.com>2008-02-04 22:28:36 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:14 -0800
commitb98938c373117043598002f197200d7ed08acd49 (patch)
treeda9356af43085db78cafec82505c3341d6291201 /fs/buffer.c
parentaec2c3ed01ed54d0cdf7f6b7c4be217c045ac5ea (diff)
bufferhead: revert constructor removal
The constructor for buffer_head slabs was removed recently. We need the constructor back in slab defrag in order to insure that slab objects always have a definite state even before we allocated them. I think we mistakenly merged the removal of the constuctor into a cleanup patch. You (ie: akpm) had a test that showed that the removal of the constructor led to a small regression. The prior state makes things easier for slab defrag. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/buffer.c')
-rw-r--r--fs/buffer.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 1de921484ea..826baf4f04b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3153,7 +3153,7 @@ static void recalc_bh_state(void)
struct buffer_head *alloc_buffer_head(gfp_t gfp_flags)
{
- struct buffer_head *ret = kmem_cache_zalloc(bh_cachep,
+ struct buffer_head *ret = kmem_cache_alloc(bh_cachep,
set_migrateflags(gfp_flags, __GFP_RECLAIMABLE));
if (ret) {
INIT_LIST_HEAD(&ret->b_assoc_buffers);
@@ -3241,12 +3241,24 @@ int bh_submit_read(struct buffer_head *bh)
}
EXPORT_SYMBOL(bh_submit_read);
+static void
+init_buffer_head(struct kmem_cache *cachep, void *data)
+{
+ struct buffer_head *bh = data;
+
+ memset(bh, 0, sizeof(*bh));
+ INIT_LIST_HEAD(&bh->b_assoc_buffers);
+}
+
void __init buffer_init(void)
{
int nrpages;
- bh_cachep = KMEM_CACHE(buffer_head,
- SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD);
+ bh_cachep = kmem_cache_create("buffer_head",
+ sizeof(struct buffer_head), 0,
+ (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|
+ SLAB_MEM_SPREAD),
+ init_buffer_head);
/*
* Limit the bh occupancy to 10% of ZONE_NORMAL