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When arc_release() is called on a header with a single buffer and L2_WRITING set, the L2HDR must be preserved for ABD cleanup (similar to the arc_hdr_destroy() case). If we destroy the L2HDR here, later arc_write() will allocate a new ABD and call arc_hdr_free_abd(), which needs b_l2hdr.b_dev to properly defer ABD cleanup, causing VERIFY(HDR_HAS_L2HDR(hdr)) to fail. Allocate a new header for the buffer in the single_buf_l2writing case (single buffer + L2_WRITING), leaving the original header with L2HDR intact. The original header becomes an "orphan" (no buffers, no b_pabd) but retains device association for ABD cleanup when l2arc_write_done() completes. The shared buffer case (HDR_SHARED_DATA) is excluded because L2ARC makes its own transformed copy via l2arc_apply_transforms(), so the original ABD is not used by the L2 write. The header can be safely reused without allocating a new one. For proper evictable space accounting, arc_buf_remove() must be called before remove_reference() in the single_buf_l2writing path. This ensures arc_evictable_space_increment() (during remove_reference) and arc_evictable_space_decrement() (during destruction) see the same state (b_buf=NULL), preventing accounting leaks that cause module unload to hang with non-zero esize. Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ameer Hamza <ahamza@ixsystems.com> Closes #18093 |
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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.
Official Resources
- Documentation - for using and developing this repo
- ZoL site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
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
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.