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vfs: make delmntque return with the interlock held

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saves on relocking dance -- the lock is taken immediately
afterwards anyway.
This commit is contained in:
Mateusz Guzik 2022-09-14 23:08:08 +00:00
parent 43fbd0e7a7
commit d04c7f10d4
1 changed files with 14 additions and 7 deletions
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21
sys/kern/vfs_subr.c
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@ -1944,18 +1944,19 @@ delmntque(struct vnode *vp)
VNPASS((vp->v_mflag & VMP_LAZYLIST) == 0, vp);
mp = vp->v_mount;
if (mp == NULL)
return;
MNT_ILOCK(mp);
VI_LOCK(vp);
vp->v_mount = NULL;
VI_UNLOCK(vp);
VNASSERT(mp->mnt_nvnodelistsize > 0, vp,
("bad mount point vnode list size"));
TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes);
mp->mnt_nvnodelistsize--;
MNT_REL(mp);
MNT_IUNLOCK(mp);
/*
* The caller expects the interlock to be still held.
*/
ASSERT_VI_LOCKED(vp, __func__);
}
static int
@ -4110,17 +4111,23 @@ vgonel(struct vnode *vp)
/*
* Clear the advisory locks and wake up waiting threads.
*/
(void)VOP_ADVLOCKPURGE(vp);
vp->v_lockf = NULL;
if (vp->v_lockf != NULL) {
(void)VOP_ADVLOCKPURGE(vp);
vp->v_lockf = NULL;
}
/*
* Delete from old mount point vnode list.
*/
delmntque(vp);
if (vp->v_mount == NULL) {
VI_LOCK(vp);
} else {
delmntque(vp);
ASSERT_VI_LOCKED(vp, "vgonel 2");
}
/*
* Done with purge, reset to the standard lock and invalidate
* the vnode.
*/
VI_LOCK(vp);
vp->v_vnlock = &vp->v_lock;
vp->v_op = &dead_vnodeops;
vp->v_type = VBAD;