Date: Fri, 18 Apr 1997 23:04:20 -0700 (PDT) From: KATO Takenori <kato> To: CVS-committers, cvs-all, cvs-sys Subject: cvs commit: src/sys/miscfs/union union_vfsops.c src/sys/miscfs/nullfs null_vfsops.c Message-ID: <199704190604.XAA28022@freefall.freebsd.org>
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kato 97/04/18 23:04:17
Modified: sys/miscfs/nullfs null_vfsops.c
sys/miscfs/union union_vfsops.c
Log:
Avoid `lock against myself' panic by following operation:
# mount -t union (or null) dir1 dir2
# mount -t union (or null) dir2 dir1
The function namei in union_mount calls union_root. The upper vnode
has been already locked and vn_lock in union_root causes above panic.
Add printf's included in `#ifdef DIAGNOSTIC' for EDEADLK cases.
Revision Changes Path
1.17 +17 -4 src/sys/miscfs/nullfs/null_vfsops.c
1.16 +16 -2 src/sys/miscfs/union/union_vfsops.c
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