Date: Mon, 14 Apr 1997 03:52:30 -0700 (PDT) From: KATO Takenori <kato> To: CVS-committers, cvs-all, cvs-sys Subject: cvs commit: src/sys/miscfs/union union_vfsops.c Message-ID: <199704141052.DAA03381@freefall.freebsd.org>
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kato 97/04/14 03:52:29
Modified: sys/miscfs/union union_vfsops.c
Log:
Fix `lockmgr: locking against myself' panic by multi union mount of
same directory pair.
If we do:
mount -t union a b
mount -t union a b
then, (1) namei tries to lock fs which has been already locked by
first union mount and (2) union_root() tries to lock locked fs. To
avoid first deadlock condition, unlock vnode if lowerrootvp is union
node, and to avoid second case, union_mount returns EDEADLK when multi
union mount is detected.
Revision Changes Path
1.15 +25 -1 src/sys/miscfs/union/union_vfsops.c
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