Date: Fri, 27 Oct 2017 11:39:00 -0400 From: Mark Johnston <markj@FreeBSD.org> To: freebsd-fs@FreeBSD.org Subject: softdep as a mount(8) option Message-ID: <20171027153859.GC2385@raichu>
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Hi, I'd like to finally enable the use of SU (not SU+J) on some small UFS filesystems. The fact that SU is enabled using a flag in the superblock poses a problem for me, however: the systems containing these filesystems may at any time be repurposed to run a kernel that supports SU but contains bugs[*] that render it unusable. I therefore can't persistently enable SU in these systems. I'm wondering if it would be possible to enable SU using a mount option rather than with a persistent flag. fsck_ffs conditionalizes some of its logic on whether SU is configured - is this necessary for correctness? That is, if I run fsck on an unclean filesystem that had been mounted with SU, and fsck runs as though SU hadn't been configured, what problems might arise? [*] These bugs are a result of local modifications and aren't in FreeBSD.
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