luck/tmp_suning_uos_patched
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split the slow part of lock_parent() off

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Turn the "trylock failed" part into uninlined __lock_parent().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-02-23 22:11:34 -05:00
parent 65d8eb5a8f
commit 8b987a46a1
1 changed files with 12 additions and 6 deletions
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18
fs/dcache.c
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@ -588,13 +588,9 @@ static void __dentry_kill(struct dentry *dentry)
dentry_free(dentry);
}
static inline struct dentry *lock_parent(struct dentry *dentry)
static struct dentry *__lock_parent(struct dentry *dentry)
{
struct dentry *parent = dentry->d_parent;
if (IS_ROOT(dentry))
return NULL;
if (likely(spin_trylock(&parent->d_lock)))
return parent;
struct dentry *parent;
rcu_read_lock();
spin_unlock(&dentry->d_lock);
again:
@ -620,6 +616,16 @@ static inline struct dentry *lock_parent(struct dentry *dentry)
return parent;
}
static inline struct dentry *lock_parent(struct dentry *dentry)
{
struct dentry *parent = dentry->d_parent;
if (IS_ROOT(dentry))
return NULL;
if (likely(spin_trylock(&parent->d_lock)))
return parent;
return __lock_parent(dentry);
}
/*
* Finish off a dentry we've decided to kill.
* dentry->d_lock must be held, returns with it unlocked.