Commit 4f48d5da authored by Xiubo Li's avatar Xiubo Li Committed by Ilya Dryomov
Browse files

fs/dcache: export d_same_name() helper 



Compare dentry name with case-exact name, return true if names
are same, or false.

Signed-off-by: default avatarXiubo Li <xiubli@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Reviewed-by: default avatarLuis Chamberlain <mcgrof@kernel.org>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 7c2e3d91

fs/dcache.c

+11 −4
Original line number Diff line number Diff line
@@ -2247,9 +2247,15 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode, 
}

EXPORT_SYMBOL(d_add_ci);





static inline bool d_same_name(const struct dentry *dentry,

				const struct dentry *parent,

/**

 * d_same_name - 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: true if names are same, or false

 */

bool d_same_name(const struct dentry *dentry, const struct dentry *parent,

		 const struct qstr *name)

{

	if (likely(!(parent->d_flags & DCACHE_OP_COMPARE))) {
@@ -2261,6 +2267,7 @@ static inline bool d_same_name(const struct dentry *dentry, 
				       dentry->d_name.len, dentry->d_name.name,

				       name) == 0;

}

EXPORT_SYMBOL_GPL(d_same_name);



/**

 * __d_lookup_rcu - search for a dentry (racy, store-free)

include/linux/dcache.h

+2 −0
Original line number Diff line number Diff line
@@ -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_same_name(const struct dentry *dentry, const struct dentry *parent,

			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 *);