lookup_dcache

函数名称：This looks up the name in dcache and possibly revalidates the found dentry.* NULL is returned if the dentry does not exist in the cache.

函数原型：static struct dentry *lookup_dcache(const struct qstr *name, struct dentry *dir, unsigned int flags)

返回类型：struct dentry

参数：

**调用者**
名称	描述
__lookup_hash	Parent directory has inode locked exclusive. This is one* and only case when ->lookup() gets called on non in-lookup* dentries - as the matter of fact, this only gets called* when directory is guaranteed to have no in-lookup children* at all.
try_lookup_one_len	ry_lookup_one_len - filesystem helper to lookup single pathname component@name: pathname component to lookup@base: base directory to lookup from@len: maximum length @len should be interpreted to Look up a dentry by name in the dcache, returning NULL
lookup_one_len	lookup_one_len - filesystem helper to lookup single pathname component@name: pathname component to lookup@base: base directory to lookup from@len: maximum length @len should be interpreted to Note that this routine is purely a helper for filesystem
lookup_one_len_unlocked	lookup_one_len_unlocked - filesystem helper to lookup single pathname component@name: pathname component to lookup@base: base directory to lookup from@len: maximum length @len should be interpreted to Note that this routine is purely a helper for

函数逻辑报告