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vfs: tidy up vdrop

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Skip vfs_refcount_release_if_not_last if the interlock is held and just
go straight to refcount_release.

While here do cosmetic rearrangement of _vhold to better show it contains
equivalent behaviour.
This commit is contained in:
Mateusz Guzik 2018-01-12 13:39:02 +00:00
parent 504d9b6029
commit 31c2c6e95e
1 changed files with 11 additions and 14 deletions
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15
sys/kern/vfs_subr.c
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@ -2840,14 +2840,14 @@ _vhold(struct vnode *vp, bool locked)
else
ASSERT_VI_UNLOCKED(vp, __func__);
CTR2(KTR_VFS, "%s: vp %p", __func__, vp);
if (!locked && vfs_refcount_acquire_if_not_zero(&vp->v_holdcnt)) {
if (!locked) {
if (vfs_refcount_acquire_if_not_zero(&vp->v_holdcnt)) {
VNASSERT((vp->v_iflag & VI_FREE) == 0, vp,
("_vhold: vnode with holdcnt is free"));
return;
}
if (!locked)
VI_LOCK(vp);
}
if ((vp->v_iflag & VI_FREE) == 0) {
refcount_acquire(&vp->v_holdcnt);
if (!locked)
@ -2911,14 +2911,11 @@ _vdrop(struct vnode *vp, bool locked)
CTR2(KTR_VFS, "%s: vp %p", __func__, vp);
if ((int)vp->v_holdcnt <= 0)
panic("vdrop: holdcnt %d", vp->v_holdcnt);
if (vfs_refcount_release_if_not_last(&vp->v_holdcnt)) {
if (locked)
VI_UNLOCK(vp);
if (!locked) {
if (vfs_refcount_release_if_not_last(&vp->v_holdcnt))
return;
}
if (!locked)
VI_LOCK(vp);
}
if (refcount_release(&vp->v_holdcnt) == 0) {
VI_UNLOCK(vp);
return;