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new helper: d_find_alias_rcu()

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similar to d_find_alias(inode), except that
	* the caller must be holding rcu_read_lock()
	* inode must not be freed until matching rcu_read_unlock()
	* result is *NOT* pinned and can only be dereferenced until
the matching rcu_read_unlock().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-01-05 14:13:52 -05:00
parent d36a1dd9f7
commit bca585d24a
2 changed files with 27 additions and 0 deletions
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2
include/linux/dcache.h
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@ -262,6 +262,8 @@ extern void d_tmpfile(struct dentry *, struct inode *);
extern struct dentry *d_find_alias(struct inode *);
extern void d_prune_aliases(struct inode *);
extern struct dentry *d_find_alias_rcu(struct inode *);
/* test whether we have any submounts in a subdir tree */
extern int path_has_submounts(const struct path *);