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Message-Id: <20220517125549.148429-2-xiubli@redhat.com>
Date: Tue, 17 May 2022 20:55:48 +0800
From: Xiubo Li <xiubli@...hat.com>
To: jlayton@...nel.org, viro@...iv.linux.org.uk
Cc: idryomov@...il.com, vshankar@...hat.com,
ceph-devel@...r.kernel.org, dchinner@...hat.com, hch@....de,
arnd@...db.de, mcgrof@...nel.org, akpm@...ux-foundation.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
Xiubo Li <xiubli@...hat.com>
Subject: [PATCH v3 1/2] fs/dcache: add d_compare() helper support
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Xiubo Li <xiubli@...hat.com>
---
fs/dcache.c | 15 +++++++++++++++
include/linux/dcache.h | 2 ++
2 files changed, 17 insertions(+)
diff --git a/fs/dcache.c b/fs/dcache.c
index 93f4f5ee07bf..95a72f92a94b 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2262,6 +2262,21 @@ static inline bool d_same_name(const struct dentry *dentry,
name) == 0;
}
+/**
+ * d_compare - compare dentry name with case-exact name
+ * @parent: parent dentry
+ * @dentry: the negative dentry that was passed to the parent's lookup func
+ * @name: the case-exact name to be associated with the returned dentry
+ *
+ * Return: 0 if names are same, or 1
+ */
+bool d_compare(const struct dentry *parent, const struct dentry *dentry,
+ const struct qstr *name)
+{
+ return !d_same_name(dentry, parent, name);
+}
+EXPORT_SYMBOL(d_compare);
+
/**
* __d_lookup_rcu - search for a dentry (racy, store-free)
* @parent: parent dentry
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index f5bba51480b2..444b2230e5c3 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -233,6 +233,8 @@ extern struct dentry * d_alloc_parallel(struct dentry *, const struct qstr *,
wait_queue_head_t *);
extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *);
+extern bool d_compare(const struct dentry *parent, const struct dentry *dentry,
+ const struct qstr *name);
extern struct dentry * d_exact_alias(struct dentry *, struct inode *);
extern struct dentry *d_find_any_alias(struct inode *inode);
extern struct dentry * d_obtain_alias(struct inode *);
--
2.36.0.rc1
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