Date: Thu, 11 Mar 1999 19:09:29 -0800 (PST) From: Julian Elischer <julian@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern kern_lock.c kern_subr.c Message-ID: <199903120309.TAA60769@freefall.freebsd.org>
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julian 1999/03/11 19:09:29 PST
Modified files:
sys/kern kern_lock.c kern_subr.c
Log:
This solves a deadlock that can occur when read()ing into a file-mmap()
space. When doing this, it is possible to for another process to attempt
to get an exclusive lock on the vnode and deadlock the mmap/read
combination when the uiomove() call tries to obtain a second
shared lock on the vnode. There is still a potential deadlock
situation with write()/mmap().
Submitted by: Matt Dillon <dillon@freebsd.org>
Reviewed by: Luoqi Chen <luoqi@freebsd.org>
Delimmitted by tag PRE_MATT_MMAP_LOCK and POST_MATT_MMAP_LOCK
in kern/kern_lock.c kern/kern_subr.c
Revision Changes Path
1.24 +24 -3 src/sys/kern/kern_lock.c
1.28 +12 -4 src/sys/kern/kern_subr.c
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