George Amanakis fa25460538 Add missing zfs_refcount_destroy() in key_mapping_rele()
Otherwise when running with reference_tracking_enable=TRUE mounting
and unmounting an encrypted dataset panics with:

Call Trace:
 dump_stack+0x66/0x90
 slab_err+0xcd/0xf2
 ? __kmalloc+0x174/0x260
 ? __kmem_cache_shutdown+0x158/0x240
 __kmem_cache_shutdown.cold+0x1d/0x115
 shutdown_cache+0x11/0x140
 kmem_cache_destroy+0x210/0x230
 spl_kmem_cache_destroy+0x122/0x3e0 [spl]
 zfs_refcount_fini+0x11/0x20 [zfs]
 spa_fini+0x4b/0x120 [zfs]
 zfs_kmod_fini+0x6b/0xa0 [zfs]
 _fini+0xa/0x68c [zfs]
 __x64_sys_delete_module+0x19c/0x2b0
 do_syscall_64+0x5b/0x1a0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reviewed-By: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-By: Tom Caputi <tcaputi@datto.com>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #10246
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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

  • Wiki - 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 Linux distribution can be found at the ZoL Site.

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 12-STABLE and 13-CURRENT.
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