Date: Tue, 14 Dec 2004 09:09:51 +0000 (UTC) From: Poul-Henning Kamp <phk@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/sys filedesc.h src/sys/kern kern_descrip.c Message-ID: <200412140909.iBE99phM026773@repoman.freebsd.org>
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phk 2004-12-14 09:09:51 UTC
FreeBSD src repository
Modified files:
sys/sys filedesc.h
sys/kern kern_descrip.c
Log:
Add a new kind of reference count (fd_holdcnt) to struct filedesc
which holds on to just the data structure and the mutex. (The
existing refcount (fd_refcnt) holds onto the open files in the
descriptor.)
The fd_holdcnt is protected by fdesc_mtx, fd_refcnt by FILEDESC_LOCK.
Add fdhold(struct proc *) which gets a hold on the filedescriptors of
the specified proc..
Add fddrop(struct filedesc *) which drops the fd_holdcnt and if zero
destroys the mutex and frees the memory.
Initialize the fd_holdcnt to one in fdinit(). Normal operations on
the filedesc structure will not change it.
In fdfree() use fddrop() to dispose of the mutex and structure. Hold
the FILEDESC_LOCK() until we have cleaned out the contents and carefully
set the fields to null values during cleanup.
Use fdhold()/fddrop() in mountcheckdirs() and sysctl_kern_file().
Revision Changes Path
1.269 +45 -16 src/sys/kern/kern_descrip.c
1.70 +2 -1 src/sys/sys/filedesc.h
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