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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: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2022-05-16 11:23:19 +08:00 committed by Ilya Dryomov
parent 7c2e3d9194
commit 4f48d5da81
2 changed files with 13 additions and 4 deletions
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15
fs/dcache.c
View File

@ -2247,10 +2247,16 @@ 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,
const struct qstr *name)
/**
* 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))) {
if (dentry->d_name.len != name->len)
@ -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)

2
include/linux/dcache.h
View File

@ -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 *);