Date: Sat, 07 Dec 2024 13:12:56 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 283179] Support O_TMPFILE in open() Message-ID: <bug-283179-227@https.bugs.freebsd.org/bugzilla/>
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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: bugs@FreeBSD.org Reporter: vini.ipsmaker@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). -- You are receiving this mail because: You are the assignee for the bug.home | help
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