On 5/24/22 4:11 AM, Matthew Wilcox wrote:
On Thu, May 19, 2022 at 06:18:45PM +0800, Xiubo Li wrote:
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
... empty commit message?
Will add it.
Thanks.
---
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
