Messages in this thread | | | From | Miklos Szeredi <> | Date | Tue, 3 May 2022 20:52:23 +0200 | Subject | Re: [LSF/MM/BPF TOPIC] making O_TMPFILE more atomic |
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On Thu, 24 Feb 2022 at 06:33, Steve French <smfrench@gmail.com> wrote: > > Currently creating tmpfiles on Linux can be problematic because the > tmpfile is not created and opened at the same time (vfs_tmpfile calls > into the fs, then later vfs_open is called to open the tmpfile). For > some filesystems it would be more natural to create and open the > tmpfile as one operation (because the action of creating the file on > some filesystems returns an open handle, so closing it then reopening > it would cause the tmpfile to be deleted). > > I would like to discuss whether the function do_tmpfile (which creates > and then opens the tmpfile) could have an option for a filesystem to > do this as one operation which would allow it to be more atomic and > allow it to work on a wider variety of filesystems.
A related thread:
https://lore.kernel.org/all/20201109100343.3958378-3-chirantan@chromium.org/#r
There was no conclusion in the end. Not sure how hacky it would be to store the open file in the inode...
Thanks, Miklos
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