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Now that ffs on disk inodes get freed in the reclaim routine it is no longer

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necessary for vget() to handle VI_INACTNOW as a special case.  Remove this
check and its support in vrelel().

Getting another reference while the freelist is locked is an error.  Replace
the check with a KASSERT.
This commit is contained in:
hannken 2010-08-17 13:17:47 +00:00
parent c2fbfedc83
commit 863afee91a
1 changed files with 5 additions and 48 deletions
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53
sys/kern/vfs_subr.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_subr.c,v 1.414 2010/07/29 10:54:50 hannken Exp $ */
/* $NetBSD: vfs_subr.c,v 1.415 2010/08/17 13:17:47 hannken Exp $ */
/*-
* Copyright (c) 1997, 1998, 2004, 2005, 2007, 2008 The NetBSD Foundation, Inc.
@ -91,7 +91,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.414 2010/07/29 10:54:50 hannken Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_subr.c,v 1.415 2010/08/17 13:17:47 hannken Exp $");
#include "opt_ddb.h"
#include "opt_compat_netbsd.h"
@ -366,16 +366,7 @@ try_nextlist:
vp->v_freelisthd = NULL;
mutex_exit(&vnode_free_list_lock);
if (vp->v_usecount != 0) {
/*
* was referenced again before we got the interlock
* Don't return to freelist - the holder of the last
* reference will destroy it.
*/
mutex_exit(&vp->v_interlock);
mutex_enter(&vnode_free_list_lock);
goto retry;
}
KASSERT(vp->v_usecount == 0);
/*
* The vnode is still associated with a file system, so we must
@ -1312,22 +1303,6 @@ vget(vnode_t *vp, int flags)
return ENOENT;
}
if ((vp->v_iflag & VI_INACTNOW) != 0) {
/*
* if it's being desactived, wait for it to complete.
* Make sure to not return a clean vnode.
*/
if ((flags & LK_NOWAIT) != 0) {
vrelel(vp, 0);
return EBUSY;
}
vwait(vp, VI_INACTNOW);
if ((vp->v_iflag & VI_CLEAN) != 0) {
vrelel(vp, 0);
return ENOENT;
}
}
/*
* Ok, we got it in good shape. Just locking left.
*/
@ -1431,30 +1406,14 @@ vrelel(vnode_t *vp, int flags)
/* The pagedaemon can't wait around; defer. */
defer = true;
} else if (curlwp == vrele_lwp) {
/*
* We have to try harder. But we can't sleep
* with VI_INACTNOW as vget() may be waiting on it.
*/
vp->v_iflag &= ~(VI_INACTREDO|VI_INACTNOW);
cv_broadcast(&vp->v_cv);
/* We have to try harder. */
vp->v_iflag &= ~VI_INACTREDO;
mutex_exit(&vp->v_interlock);
error = vn_lock(vp, LK_EXCLUSIVE);
if (error != 0) {
/* XXX */
vpanic(vp, "vrele: unable to lock %p");
}
mutex_enter(&vp->v_interlock);
/*
* if we did get another reference while
* sleeping, don't try to inactivate it yet.
*/
if (__predict_false(vtryrele(vp))) {
VOP_UNLOCK(vp);
mutex_exit(&vp->v_interlock);
return;
}
vp->v_iflag |= VI_INACTNOW;
mutex_exit(&vp->v_interlock);
defer = false;
} else if ((vp->v_iflag & VI_LAYER) != 0) {
/*
@ -1490,7 +1449,6 @@ vrelel(vnode_t *vp, int flags)
if (++vrele_pending > (desiredvnodes >> 8))
cv_signal(&vrele_cv);
mutex_exit(&vrele_lock);
cv_broadcast(&vp->v_cv);
mutex_exit(&vp->v_interlock);
return;
}
@ -1515,7 +1473,6 @@ vrelel(vnode_t *vp, int flags)
VOP_INACTIVE(vp, &recycle);
mutex_enter(&vp->v_interlock);
vp->v_iflag &= ~VI_INACTNOW;
cv_broadcast(&vp->v_cv);
if (!recycle) {
if (vtryrele(vp)) {
mutex_exit(&vp->v_interlock);