Serapheim Dimitropoulos ae93aeb849 Add warning for external consumers of dmu_tx_callback_register
While reading some code @grwilson came across the above function that
seemingly had no consumers besides a ztest callback that ensures that
the tx_callback infrastructure works correctly. It turns out that Lustre
is the main (and potentially the only) consumer of this. Refer to
`osd_trans_commit_cb` of `lustre/osd-zfs/osd_handler.c` in the Lustre
repo for more info. Let's add a comment highlighting this before someone
removes it by mistake.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Serapheim Dimitropoulos <serapheimd@gmail.com>
Closes #16698
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.
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