Date: Thu, 13 Jun 2002 14:49:10 -0700 (PDT) From: Semen Ustimenko <semenu@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/fs/nullfs null.h null_subr.c null_vfsops.c null_vnops.c Message-ID: <200206132149.g5DLnAa93770@freefall.freebsd.org>
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semenu 2002/06/13 14:49:10 PDT
Modified files:
sys/fs/nullfs null.h null_subr.c null_vfsops.c
null_vnops.c
Log:
Fix a race during null node creation between relookuping the hash and
adding vnode to hash. The fix is to use atomic hash-lookup-and-add-if-
not-found operation. The odd thing is that this race can't happen
actually because the lowervp vnode is locked exclusively now during the
whole process of null node creation. This must be thought as a step
toward shared lookups.
Also remove vp->v_mount checks when looking for a match in the hash,
as this is the vestige.
Also add comments and cosmetic changes.
Revision Changes Path
1.18 +1 -1 src/sys/fs/nullfs/null.h
1.35 +86 -96 src/sys/fs/nullfs/null_subr.c
1.53 +3 -3 src/sys/fs/nullfs/null_vfsops.c
1.56 +13 -6 src/sys/fs/nullfs/null_vnops.c
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