Module Name: src
Committed By: riastradh
Date: Mon Mar 28 12:36:51 UTC 2022
Modified Files:
src/sys/miscfs/specfs: spec_vnops.c specdev.h
Log Message:
specfs: Drain all I/O operations after last .d_close call.
New kind of I/O reference on specdevs, sd_iocnt. This could be done
with psref instead; I chose a reference count instead for now because
we already have to take a per-object lock anyway, v_interlock, for
vdead_check, so another atomic is not likely to hurt much more. We
can always change the mechanism inside spec_io_enter/exit/drain later
on.
Make sure every access to vp->v_rdev or vp->v_specnode and every call
to a devsw operation is protected either:
- by the vnode lock (with vdead_check if we unlocked/relocked),
- by positive sd_opencnt,
- by spec_io_enter/exit, or
- by sd_opencnt management in open/close.
To generate a diff of this commit:
cvs rdiff -u -r1.201 -r1.202 src/sys/miscfs/specfs/spec_vnops.c
cvs rdiff -u -r1.48 -r1.49 src/sys/miscfs/specfs/specdev.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
