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| author | Al Viro <viro@zeniv.linux.org.uk> | 2019-10-31 06:21:58 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-11-15 19:49:04 +0100 |
| commit | 6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04 (patch) | |
| tree | 2b14c83985da30129911f7ad455e4cc587690e58 /fs/debugfs | |
| parent | fs/namei.c: pull positivity check into follow_managed() (diff) | |
| download | linux-6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04.tar.xz linux-6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04.zip | |
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 'fs/debugfs')
| -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 7b975dbb2bb4..f4d8df5e4714 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -299,13 +299,9 @@ 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); |