Diffusion FreeBSD src repository 7a8d4b4da69a

FFS: assign fully initialized struct mount_softdeps to um_softdep
7a8d4b4da69a
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Description

FFS: assign fully initialized struct mount_softdeps to um_softdep

Other threads observing the non-NULL um_softdep can assume that it is
safe to use it. This is important for ro->rw remounts where change from
read-only to read-write status cannot be made atomic.

Reviewed by: mckusick
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D29178

Details

Provenance

kib	Authored on Mar 3 2021, 10:02 PM

Reviewer

Differential Revision

D29178: UFS SU: handle races on remounts rw<->ro

Parents

rG2af934cc15bd: Assert that um_softdep is NULL on free(ump), i.e. softdep_unmount() was called

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Event Timeline

kib committed rG7a8d4b4da69a: FFS: assign fully initialized struct mount_softdeps to um_softdep (authored by kib).Mar 12 2021, 11:31 AM

kib added an edge: D29178: UFS SU: handle races on remounts rw<->ro.Mar 12 2021, 11:33 AM

kib mentioned this in rG22d33453e141: FFS: assign fully initialized struct mount_softdeps to um_softdep.Aug 14 2021, 10:23 AM

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Size

sys/

ufs/

ffs/

rG7a8d4b4da69a

sys/ufs/ffs/ffs_softdep.c

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