From 6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 31 Oct 2019 01:21:58 -0400 Subject: new helper: lookup_positive_unlocked() Most of the callers of lookup_one_len_unlocked() treat negatives are ERR_PTR(-ENOENT). Provide a helper that would do just that. Note that a pinned positive dentry remains positive - it's ->d_inode is stable, etc.; a pinned _negative_ dentry can become positive at any point as long as you are not holding its parent at least shared. So using lookup_one_len_unlocked() needs to be careful; lookup_positive_unlocked() is safer and that's what the callers end up open-coding anyway. Signed-off-by: Al Viro --- include/linux/namei.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/namei.h') diff --git a/include/linux/namei.h b/include/linux/namei.h index 397a08ade6a2..7fe7b87a3ded 100644 --- a/include/linux/namei.h +++ b/include/linux/namei.h @@ -60,6 +60,7 @@ extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int); extern struct dentry *lookup_one_len(const char *, struct dentry *, int); extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int); +extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int); extern int follow_down_one(struct path *); extern int follow_down(struct path *); -- cgit v1.2.3