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vfs: add lookup_hash() helper

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Overlayfs needs lookup without inode_permission() and already has the name
hash (in form of dentry->d_name on overlayfs dentry).  It also doesn't
support filesystems with d_op->d_hash() so basically it only needs
the actual hashed lookup from lookup_one_len_unlocked()

So add a new helper that does unlocked lookup of a hashed name.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2016-05-11 01:16:37 +02:00
committed by Al Viro
parent 9409e22acd
commit 3c9fe8cdff
2 changed files with 30 additions and 5 deletions
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2
include/linux/namei.h
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@@ -79,6 +79,8 @@ extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
struct qstr;
extern struct dentry *lookup_hash(const struct qstr *, struct dentry *);
extern int follow_down_one(struct path *);
extern int follow_down(struct path *);