diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2019-10-31 01:21:58 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-23 10:47:59 +0200 |
| commit | 3c70569e17ca4644831d200de65cf65ece3e5eb4 (patch) | |
| tree | 1d5bdb091c465acdf6f9f145f750e3ea019333be /fs/debugfs/inode.c | |
| parent | 5701502619d48e125ed544572586dec11d2a6074 (diff) | |
new helper: lookup_positive_unlocked()
[ Upstream commit 6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04 ]
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>
Stable-dep-of: 0d5a4f8f775f ("fs: Fix error checking for d_hash_and_lookup()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/debugfs/inode.c')
| -rw-r--r-- | fs/debugfs/inode.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 4661ecaf6741c..1e4ae78f64a8f 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -275,13 +275,9 @@ struct dentry *debugfs_lookup(const char *name, struct dentry *parent) if (!parent) parent = debugfs_mount->mnt_root; - dentry = lookup_one_len_unlocked(name, parent, strlen(name)); + dentry = lookup_positive_unlocked(name, parent, strlen(name)); if (IS_ERR(dentry)) return NULL; - if (!d_really_is_positive(dentry)) { - dput(dentry); - return NULL; - } return dentry; } EXPORT_SYMBOL_GPL(debugfs_lookup); |