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don't cdevvp() if a vnode for the dev already exists. Note that that's

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conceptually icky; you end up ref'ing a 'real' vnode, and hence perhaps
tying down a file system; should be able to reference a 'fake' one,
but i doesn't appear save to cdevvp() if vnode for same dev is already
around...  also, mark vfinddev()s XXX (for later).
This commit is contained in:
cgd 1994-04-11 19:53:29 +00:00
parent e7eb2d4831
commit 34ac381d05
1 changed files with 10 additions and 4 deletions
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14
sys/dev/cons.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* from: @(#)cons.c 7.2 (Berkeley) 5/9/91
* $Id: cons.c,v 1.13 1994/04/10 01:11:28 cgd Exp $
* $Id: cons.c,v 1.14 1994/04/11 19:53:29 cgd Exp $
*/
#include <sys/param.h>
@ -101,8 +101,14 @@ cnopen(dev, flag, mode, p)
*/
dev = cn_tab->cn_dev;
if (cn_devvp == NULLVP) {
/* try to get a reference on its vnode, but fail silently */
cdevvp(dev, &cn_devvp);
/*
* try to get a reference on its vnode, but fail silently
* vfinddev XXX
*/
if (vfinddev(dev, VCHR, &cn_devvp) == 0 && vcount(cn_devvp))
vref(cn_devvp);
else
cdevvp(dev, &cn_devvp);
}
return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p));
}
@ -129,7 +135,7 @@ cnclose(dev, flag, mode, p)
vrele(cn_devvp);
cn_devvp = NULLVP;
}
if ((vfinddev(dev, VCHR, &vp) == 0) && vcount(vp))
if ((vfinddev(dev, VCHR, &vp) == 0) && vcount(vp)) /* XXX */
return (0);
return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p));
}