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There are regions in the ZFS code where it is desirable to be able to be set PF_FSTRANS while a specific mutex is held. The ZFS code could be updated to set/clear this flag in all the correct places, but this is undesirable for a few reasons. 1) It would require changes to a significant amount of the ZFS code. This would complicate applying patches from upstream. 2) It would be easy to accidentally miss a critical region in the initial patch or to have an future change introduce a new one. Both of these concerns can be addressed by using a new mutex type which is responsible for managing PF_FSTRANS, support for which was added to the SPL in commit zfsonlinux/spl@9099312 - Merge branch 'kmem-rework'. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #3050 Closes #3055 Closes #3062 Closes #3132 Closes #3142 Closes #2983 |
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