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jbd2: use kmem_cache_zalloc for allocating journal head 

This commit tries to use kmem_cache_zalloc instead of kmem_cache_alloc/
memset when a new journal head is alloctated.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Zheng Liu 2013-05-28 07:27:11 -04:00 committed by Theodore Ts'o
parent d23142c627
commit 5d9cf9c625
1 changed files with 3 additions and 5 deletions
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8
fs/jbd2/journal.c
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@ -2325,13 +2325,13 @@ static struct journal_head *journal_alloc_journal_head(void)
#ifdef CONFIG_JBD2_DEBUG
atomic_inc(&nr_journal_heads);
#endif
ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS);
ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS);
if (!ret) {
jbd_debug(1, "out of memory for journal_head\n");
pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__);
while (!ret) {
yield();
ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS);
ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS);
}
}
return ret;
@ -2393,10 +2393,8 @@ struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh)
struct journal_head *new_jh = NULL;
repeat:
if (!buffer_jbd(bh)) {
if (!buffer_jbd(bh))
new_jh = journal_alloc_journal_head();
memset(new_jh, 0, sizeof(*new_jh));
}
jbd_lock_bh_journal_head(bh);
if (buffer_jbd(bh)) {