https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283179
Bug ID: 283179
Summary: Support O_TMPFILE in open()
Product: Base System
Version: 15.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: vini.ipsma...@gmail.com
Linux supports the creation of unlinked inodes (unnamed temporary regular
files) that can later be linked in the filesystem with linkat():
https://www.mankier.com/2/open#Description-O_TMPFILE
> Create an unnamed temporary regular file. The pathname argument specifies a
> directory; an unnamed inode will be created in that directory's filesystem.
> Anything written to the resulting file will be lost when the last file
> descriptor is closed, unless the file is given a name.
I believe OpenZFS already supports this feature given the history of fixed bug
reports such as <https://github.com/openzfs/zfs/issues/14301>.
Could FreeBSD just expose this feature already supported by OpenZFS?
The main use cases:
> * Improved tmpfile(3) functionality: race-free creation of temporary files
> that (1) are automatically deleted when closed; (2) can never be reached via
> any pathname; (3) are not subject to symlink attacks; and (4) do not require
> the caller to devise unique names.
>
> * Creating a file that is initially invisible, which is then populated with
> data and adjusted to have appropriate filesystem attributes (fchown(2),
> fchmod(2), fsetxattr(2), etc.) before being atomically linked into the
> filesystem in a fully formed state (using linkat(2) as described above).
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