new helper: lookup_positive_unlocked()

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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>

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Al Viro 2019-10-31 01:21:58 -04:00

parent d41efb522e

commit 6c2d4798a8

9 changed files with 35 additions and 47 deletions

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include/linux/namei.h

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