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authorAl Viro <viro@zeniv.linux.org.uk>2019-10-31 08:21:58 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2019-11-15 21:49:04 +0300
commit6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04 (patch)
tree2b14c83985da30129911f7ad455e4cc587690e58 /include/linux/namei.h
parentd41efb522e902364ab09c782d511c1bedc388ddd (diff)
downloadlinux-6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04.tar.xz
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 <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/namei.h')
-rw-r--r--include/linux/namei.h1
1 files changed, 1 insertions, 0 deletions
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 *);