Fix a problem with procfs_exit() that resulted in missing some procfs
nodes; this also apparantly caused a panic in some circumstances. Also, since procfs_exit() is getting rid of the nodes when a process exits, don't bother checking for the process' existance in procfs_inactive().
This commit is contained in:
Sean Eric Fagan
parent
484b65d5d8
commit
ba9d19e99b
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@ -36,7 +36,7 @@
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*
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* @(#)procfs_subr.c 8.6 (Berkeley) 5/14/95
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*
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* $Id: procfs_subr.c,v 1.19 1997/12/08 01:06:22 sef Exp $
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* $Id: procfs_subr.c,v 1.20 1997/12/09 05:03:41 sef Exp $
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*/
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#include <sys/param.h>
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@ -358,16 +358,30 @@ procfs_exit(struct proc *p)
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struct pfsnode *pfs;
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pid_t pid = p->p_pid;
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for (pfs = pfshead; pfs ; pfs = pfs->pfs_next) {
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struct vnode *vp = PFSTOV(pfs);
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/*
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* XXX - this is probably over-paranoid here --
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* for some reason, occasionally the v_tag is
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* not VT_PROCFS; this results in a panic. I'm
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* not sure *why* that is happening.
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*/
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if (pfs->pfs_pid == pid && vp->v_usecount &&
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vp->v_tag == VT_PROCFS)
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vgone(vp);
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/*
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* The reason for this loop is not obvious -- basicly,
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* procfs_freevp(), which is called via vgone() (eventually),
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* removes the specified procfs node from the pfshead list.
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* It does this by *pfsp = pfs->pfs_next, meaning that it
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* overwrites the node. So when we do pfs = pfs->next, we
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* end up skipping the node that replaces the one that was
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* vgone'd. Since it may have been the last one on the list,
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* it may also have been set to null -- but *our* pfs pointer,
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* here, doesn't see this. So the loop starts from the beginning
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* again.
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*
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* This is not a for() loop because the final event
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* would be "pfs = pfs->pfs_next"; in the case where
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* pfs is set to pfshead again, that would mean that
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* pfshead is skipped over.
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*
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*/
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pfs = pfshead;
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while (pfs) {
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if (pfs->pfs_pid == pid) {
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vgone(PFSTOV(pfs));
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pfs = pfshead;
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} else
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pfs = pfs->pfs_next;
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}
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}
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@ -36,7 +36,7 @@
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*
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* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
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*
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* $Id: procfs_vnops.c,v 1.45 1997/12/07 04:01:03 sef Exp $
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* $Id: procfs_vnops.c,v 1.46 1997/12/08 22:09:24 sef Exp $
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*/
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/*
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@ -324,13 +324,6 @@ procfs_bmap(ap)
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* list, so to get it back vget() must be
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* used.
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*
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* for procfs, check if the process is still
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* alive and if it isn't then just throw away
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* the vnode by calling vgone(). this may
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* be overkill and a waste of time since the
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* chances are that the process will still be
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* there and PFIND is not free.
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*
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* (vp) is locked on entry, but must be unlocked on exit.
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*/
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static int
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@ -340,11 +333,8 @@ procfs_inactive(ap)
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct pfsnode *pfs = VTOPFS(vp);
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VOP_UNLOCK(vp, 0, ap->a_p);
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if (PFIND(pfs->pfs_pid) == 0)
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vgone(vp);
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return (0);
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}
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@ -36,7 +36,7 @@
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*
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* @(#)procfs_subr.c 8.6 (Berkeley) 5/14/95
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*
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* $Id: procfs_subr.c,v 1.19 1997/12/08 01:06:22 sef Exp $
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* $Id: procfs_subr.c,v 1.20 1997/12/09 05:03:41 sef Exp $
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*/
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#include <sys/param.h>
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@ -358,16 +358,30 @@ procfs_exit(struct proc *p)
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struct pfsnode *pfs;
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pid_t pid = p->p_pid;
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for (pfs = pfshead; pfs ; pfs = pfs->pfs_next) {
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struct vnode *vp = PFSTOV(pfs);
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/*
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* XXX - this is probably over-paranoid here --
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* for some reason, occasionally the v_tag is
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* not VT_PROCFS; this results in a panic. I'm
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* not sure *why* that is happening.
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*/
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if (pfs->pfs_pid == pid && vp->v_usecount &&
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vp->v_tag == VT_PROCFS)
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vgone(vp);
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/*
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* The reason for this loop is not obvious -- basicly,
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* procfs_freevp(), which is called via vgone() (eventually),
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* removes the specified procfs node from the pfshead list.
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* It does this by *pfsp = pfs->pfs_next, meaning that it
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* overwrites the node. So when we do pfs = pfs->next, we
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* end up skipping the node that replaces the one that was
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* vgone'd. Since it may have been the last one on the list,
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* it may also have been set to null -- but *our* pfs pointer,
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* here, doesn't see this. So the loop starts from the beginning
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* again.
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*
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* This is not a for() loop because the final event
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* would be "pfs = pfs->pfs_next"; in the case where
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* pfs is set to pfshead again, that would mean that
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* pfshead is skipped over.
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*
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*/
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pfs = pfshead;
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while (pfs) {
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if (pfs->pfs_pid == pid) {
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vgone(PFSTOV(pfs));
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pfs = pfshead;
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} else
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pfs = pfs->pfs_next;
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}
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}
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@ -36,7 +36,7 @@
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*
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* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
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*
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* $Id: procfs_vnops.c,v 1.45 1997/12/07 04:01:03 sef Exp $
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* $Id: procfs_vnops.c,v 1.46 1997/12/08 22:09:24 sef Exp $
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*/
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/*
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@ -324,13 +324,6 @@ procfs_bmap(ap)
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* list, so to get it back vget() must be
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* used.
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*
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* for procfs, check if the process is still
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* alive and if it isn't then just throw away
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* the vnode by calling vgone(). this may
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* be overkill and a waste of time since the
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* chances are that the process will still be
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* there and PFIND is not free.
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*
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* (vp) is locked on entry, but must be unlocked on exit.
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*/
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static int
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@ -340,11 +333,8 @@ procfs_inactive(ap)
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct pfsnode *pfs = VTOPFS(vp);
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VOP_UNLOCK(vp, 0, ap->a_p);
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if (PFIND(pfs->pfs_pid) == 0)
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vgone(vp);
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return (0);
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}
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