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Add a PFS_DISABLED flag; pfs_visible() automatically returns 0 if it is set

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on the node in question.  Also add two API functions for setting and clearing
this flag; setting it also reclaims all vnodes associated with the node.
This commit is contained in:
Dag-Erling Smørgrav 2001-10-02 22:22:42 +00:00
parent 1c3903d23f
commit b84ce33438
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=84386
3 changed files with 57 additions and 10 deletions
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7
sys/fs/pseudofs/pseudofs.h
View file

@ -57,6 +57,7 @@ typedef enum {
#define PFS_RAWRD 0x0004 /* raw reader */
#define PFS_RAWWR 0x0008 /* raw writer */
#define PFS_RAW (PFS_RAWRD|PFS_RAWWR)
#define PFS_DISABLED 0x8000 /* node is disabled */
/*
* Data structures
@ -164,6 +165,12 @@ int pfs_statfs (struct mount *mp, struct statfs *sbp,
int pfs_init (struct pfs_info *pi, struct vfsconf *vfc);
int pfs_uninit (struct pfs_info *pi, struct vfsconf *vfc);
/*
* Other utility functions
*/
int pfs_disable (struct pfs_node *pn);
int pfs_enable (struct pfs_node *pn);
/*
* Now for some initialization magic...
*/

38
sys/fs/pseudofs/pseudofs_vncache.c
View file

@ -92,6 +92,9 @@ void
pfs_vncache_unload(void)
{
rm_at_exit(pfs_exit);
if (pfs_vncache_entries != 0)
printf("pfs_vncache_unload(): %d entries remaining\n",
pfs_vncache_entries);
mtx_destroy(&pfs_vncache_mutex);
}
@ -217,3 +220,38 @@ pfs_exit(struct proc *p)
}
mtx_unlock(&pfs_vncache_mutex);
}
/*
* Disable a pseudofs node, and free all vnodes associated with it
*/
int
pfs_disable(struct pfs_node *pn)
{
struct pfs_vdata *pvd, *prev;
if (pn->pn_flags & PFS_DISABLED)
return (0);
mtx_lock(&pfs_vncache_mutex);
pn->pn_flags |= PFS_DISABLED;
/* see the comment about the double loop in pfs_exit() */
/* XXX linear search... not very efficient */
for (pvd = pfs_vncache; pvd != NULL; pvd = pvd->pvd_next) {
while (pvd != NULL && pvd->pvd_pn == pn) {
prev = pvd->pvd_prev;
vgone(pvd->pvd_vnode);
pvd = prev ? prev->pvd_next : pfs_vncache;
}
}
mtx_unlock(&pfs_vncache_mutex);
return (0);
}
/*
* Re-enable a disabled pseudofs node
*/
int
pfs_enable(struct pfs_node *pn)
{
pn->pn_flags &= ~PFS_DISABLED;
return (0);
}

22
sys/fs/pseudofs/pseudofs_vnops.c
View file

@ -77,17 +77,20 @@ pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid)
PFS_TRACE(("%s (pid: %d, req: %d)",
pn->pn_name, pid, td->td_proc->p_pid));
if (pid == NO_PID)
PFS_RETURN (1);
if (pn->pn_flags & PFS_DISABLED)
PFS_RETURN (0);
r = 1;
if ((proc = pfind(pid)) == NULL)
PFS_RETURN (0);
/* XXX should lock td->td_proc? */
if (p_cansee(td->td_proc, proc) != 0 ||
(pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn)))
r = 0;
PROC_UNLOCK(proc);
if (pid != NO_PID) {
if ((proc = pfind(pid)) == NULL)
PFS_RETURN (0);
/* XXX should lock td->td_proc? */
if (p_cansee(td->td_proc, proc) != 0 ||
(pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn)))
r = 0;
PROC_UNLOCK(proc);
}
PFS_RETURN (r);
}
@ -150,7 +153,6 @@ pfs_getattr(struct vop_getattr_args *va)
switch (pn->pn_type) {
case pfstype_procdir:
/* XXX needs p_cansee */
case pfstype_root:
case pfstype_dir:
vap->va_mode = 0555;