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Subject[PATCH] fs/dcache.c: revamped to use a more straightforward and efficient way to operate
Date
Signed-off-by: Denis Cheng <crquan@gmail.com>
---
fs/dcache.c | 39 ++++++++++++++++++---------------------
1 files changed, 18 insertions(+), 21 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index 678d39d..05ed44a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1138,29 +1138,26 @@ struct dentry * d_alloc_anon(struct inode *inode)

spin_lock(&dcache_lock);
res = __d_find_alias(inode, 0);
- if (!res) {
- /* attach a disconnected dentry */
- res = tmp;
- tmp = NULL;
- spin_lock(&res->d_lock);
- res->d_sb = inode->i_sb;
- res->d_parent = res;
- res->d_inode = inode;
- res->d_flags |= DCACHE_DISCONNECTED;
- res->d_flags &= ~DCACHE_UNHASHED;
- list_add(&res->d_alias, &inode->i_dentry);
- hlist_add_head(&res->d_hash, &inode->i_sb->s_anon);
- spin_unlock(&res->d_lock);
-
- inode = NULL; /* don't drop reference */
- }
- spin_unlock(&dcache_lock);
-
- if (inode)
+ if (unlikely(res)) {
+ spin_unlock(&dcache_lock);
iput(inode);
- if (tmp)
dput(tmp);
- return res;
+ return res;
+ } else {
+ /* attach a disconnected dentry */
+ spin_lock(&tmp->d_lock);
+ tmp->d_sb = inode->i_sb;
+ tmp->d_parent = tmp;
+ tmp->d_inode = inode;
+ tmp->d_flags |= DCACHE_DISCONNECTED;
+ tmp->d_flags &= ~DCACHE_UNHASHED;
+ list_add(&tmp->d_alias, &inode->i_dentry);
+ hlist_add_head(&tmp->d_hash, &inode->i_sb->s_anon);
+ spin_unlock(&tmp->d_lock);
+
+ spin_unlock(&dcache_lock);
+ return tmp;
+ }
}


--
1.5.3.2
-
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