Adapt vfs kqfilter to the shared vnode lock used by zfs write vop. Use
vnode interlock to protect the knote fields [1]. The locking assumes that shared vnode lock is held, thus we get exclusive access to knote either by exclusive vnode lock protection, or by shared vnode lock + vnode interlock. Do not use kl_locked() method to assert either lock ownership or the fact that curthread does not own the lock. For shared locks, ownership is not recorded, e.g. VOP_ISLOCKED can return LK_SHARED for the shared lock not owned by curthread, causing false positives in kqueue subsystem assertions about knlist lock. Remove kl_locked method from knlist lock vector, and add two separate assertion methods kl_assert_locked and kl_assert_unlocked, that are supposed to use proper asserts. Change knlist_init accordingly. Add convenience function knlist_init_mtx to reduce number of arguments for typical knlist initialization. Submitted by: jhb [1] Noted by: jhb [2] Reviewed by: jhb Tested by: rnoland
This commit is contained in:
parent
5591364265
commit
d8b0556c6d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=193951
@ -194,7 +194,7 @@ targopen(struct cdev *dev, int flags, int fmt, struct thread *td)
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TAILQ_INIT(&softc->work_queue);
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TAILQ_INIT(&softc->abort_queue);
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TAILQ_INIT(&softc->user_ccb_queue);
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knlist_init(&softc->read_select.si_note, NULL, NULL, NULL, NULL);
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knlist_init_mtx(&softc->read_select.si_note, NULL);
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return (0);
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}
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@ -260,7 +260,7 @@ apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc)
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clone->acpi_sc = acpi_sc;
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clone->notify_status = APM_EV_NONE;
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bzero(&clone->sel_read, sizeof(clone->sel_read));
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knlist_init(&clone->sel_read.si_note, &acpi_mutex, NULL, NULL, NULL);
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knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex);
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/*
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* The acpi device is always managed by devd(8) and is considered
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@ -423,7 +423,7 @@ proc0_init(void *dummy __unused)
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p->p_sysent = &null_sysvec;
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p->p_flag = P_SYSTEM | P_INMEM;
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p->p_state = PRS_NORMAL;
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knlist_init(&p->p_klist, &p->p_mtx, NULL, NULL, NULL);
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knlist_init_mtx(&p->p_klist, &p->p_mtx);
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STAILQ_INIT(&p->p_ktr);
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p->p_nice = NZERO;
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td->td_tid = PID_MAX + 1;
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@ -208,12 +208,10 @@ SYSCTL_INT(_kern, OID_AUTO, kq_calloutmax, CTLFLAG_RW,
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} while (0)
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#ifdef INVARIANTS
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#define KNL_ASSERT_LOCKED(knl) do { \
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if (!knl->kl_locked((knl)->kl_lockarg)) \
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panic("knlist not locked, but should be"); \
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knl->kl_assert_locked((knl)->kl_lockarg); \
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} while (0)
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#define KNL_ASSERT_UNLOCKED(knl) do { \
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if (knl->kl_locked((knl)->kl_lockarg)) \
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panic("knlist locked, but should not be"); \
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#define KNL_ASSERT_UNLOCKED(knl) do { \
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knl->kl_assert_unlocked((knl)->kl_lockarg); \
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} while (0)
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#else /* !INVARIANTS */
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#define KNL_ASSERT_LOCKED(knl) do {} while(0)
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@ -577,7 +575,7 @@ kqueue(struct thread *td, struct kqueue_args *uap)
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mtx_init(&kq->kq_lock, "kqueue", NULL, MTX_DEF|MTX_DUPOK);
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TAILQ_INIT(&kq->kq_head);
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kq->kq_fdp = fdp;
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knlist_init(&kq->kq_sel.si_note, &kq->kq_lock, NULL, NULL, NULL);
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knlist_init_mtx(&kq->kq_sel.si_note, &kq->kq_lock);
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TASK_INIT(&kq->kq_task, 0, kqueue_task, kq);
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FILEDESC_XLOCK(fdp);
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@ -1723,7 +1721,6 @@ MTX_SYSINIT(knlist_lock, &knlist_lock, "knlist lock for lockless objects",
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MTX_DEF);
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static void knlist_mtx_lock(void *arg);
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static void knlist_mtx_unlock(void *arg);
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static int knlist_mtx_locked(void *arg);
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static void
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knlist_mtx_lock(void *arg)
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@ -1737,15 +1734,22 @@ knlist_mtx_unlock(void *arg)
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mtx_unlock((struct mtx *)arg);
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}
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static int
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knlist_mtx_locked(void *arg)
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static void
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knlist_mtx_assert_locked(void *arg)
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{
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return (mtx_owned((struct mtx *)arg));
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mtx_assert((struct mtx *)arg, MA_OWNED);
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}
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static void
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knlist_mtx_assert_unlocked(void *arg)
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{
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mtx_assert((struct mtx *)arg, MA_NOTOWNED);
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}
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void
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knlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *),
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void (*kl_unlock)(void *), int (*kl_locked)(void *))
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void (*kl_unlock)(void *),
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void (*kl_assert_locked)(void *), void (*kl_assert_unlocked)(void *))
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{
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if (lock == NULL)
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@ -1761,14 +1765,25 @@ knlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *),
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knl->kl_unlock = knlist_mtx_unlock;
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else
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knl->kl_unlock = kl_unlock;
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if (kl_locked == NULL)
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knl->kl_locked = knlist_mtx_locked;
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if (kl_assert_locked == NULL)
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knl->kl_assert_locked = knlist_mtx_assert_locked;
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else
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knl->kl_locked = kl_locked;
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knl->kl_assert_locked = kl_assert_locked;
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if (kl_assert_unlocked == NULL)
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knl->kl_assert_unlocked = knlist_mtx_assert_unlocked;
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else
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knl->kl_assert_unlocked = kl_assert_unlocked;
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SLIST_INIT(&knl->kl_list);
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}
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void
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knlist_init_mtx(struct knlist *knl, struct mtx *lock)
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{
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knlist_init(knl, lock, NULL, NULL, NULL, NULL);
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}
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void
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knlist_destroy(struct knlist *knl)
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{
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@ -304,7 +304,7 @@ fork1(td, flags, pages, procp)
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#ifdef MAC
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mac_proc_init(newproc);
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#endif
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knlist_init(&newproc->p_klist, &newproc->p_mtx, NULL, NULL, NULL);
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knlist_init_mtx(&newproc->p_klist, &newproc->p_mtx);
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STAILQ_INIT(&newproc->p_ktr);
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/* We have to lock the process tree while we look for a pid. */
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@ -328,10 +328,8 @@ kern_pipe(struct thread *td, int fildes[2])
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rpipe = &pp->pp_rpipe;
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wpipe = &pp->pp_wpipe;
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knlist_init(&rpipe->pipe_sel.si_note, PIPE_MTX(rpipe), NULL, NULL,
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NULL);
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knlist_init(&wpipe->pipe_sel.si_note, PIPE_MTX(wpipe), NULL, NULL,
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NULL);
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knlist_init_mtx(&rpipe->pipe_sel.si_note, PIPE_MTX(rpipe));
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knlist_init_mtx(&wpipe->pipe_sel.si_note, PIPE_MTX(wpipe));
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/* Only the forward direction pipe is backed by default */
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if ((error = pipe_create(rpipe, 1)) != 0 ||
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@ -933,8 +933,8 @@ tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex)
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mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF);
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}
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knlist_init(&tp->t_inpoll.si_note, tp->t_mtx, NULL, NULL, NULL);
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knlist_init(&tp->t_outpoll.si_note, tp->t_mtx, NULL, NULL, NULL);
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knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx);
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knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx);
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sx_xlock(&tty_list_sx);
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TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
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@ -742,8 +742,8 @@ pts_alloc(int fflags, struct thread *td, struct file *fp)
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uihold(uid);
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tp = tty_alloc(&pts_class, psc);
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knlist_init(&psc->pts_inpoll.si_note, tp->t_mtx, NULL, NULL, NULL);
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knlist_init(&psc->pts_outpoll.si_note, tp->t_mtx, NULL, NULL, NULL);
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knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx);
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knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx);
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/* Expose the slave device as well. */
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tty_makedev(tp, td->td_ucred, "pts/%u", psc->pts_unit);
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@ -782,8 +782,8 @@ pts_alloc_external(int fflags, struct thread *td, struct file *fp,
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uihold(uid);
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tp = tty_alloc(&pts_class, psc);
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knlist_init(&psc->pts_inpoll.si_note, tp->t_mtx, NULL, NULL, NULL);
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knlist_init(&psc->pts_outpoll.si_note, tp->t_mtx, NULL, NULL, NULL);
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knlist_init_mtx(&psc->pts_inpoll.si_note, tp->t_mtx);
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knlist_init_mtx(&psc->pts_outpoll.si_note, tp->t_mtx);
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/* Expose the slave device as well. */
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tty_makedev(tp, td->td_ucred, "%s", name);
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@ -1531,8 +1531,8 @@ mqueue_alloc(const struct mq_attr *attr)
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mq->mq_msgsize = default_msgsize;
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}
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mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
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knlist_init(&mq->mq_rsel.si_note, &mq->mq_mutex, NULL, NULL, NULL);
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knlist_init(&mq->mq_wsel.si_note, &mq->mq_mutex, NULL, NULL, NULL);
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knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
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knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
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atomic_add_int(&curmq, 1);
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return (mq);
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}
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@ -376,10 +376,8 @@ socreate(int dom, struct socket **aso, int type, int proto,
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#ifdef MAC
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mac_socket_create(cred, so);
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#endif
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knlist_init(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv),
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NULL, NULL, NULL);
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knlist_init(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd),
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NULL, NULL, NULL);
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knlist_init_mtx(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv));
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knlist_init_mtx(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd));
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so->so_count = 1;
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/*
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* Auto-sizing of socket buffers is managed by the protocols and
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@ -445,10 +443,8 @@ sonewconn(struct socket *head, int connstatus)
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#ifdef MAC
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mac_socket_newconn(head, so);
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#endif
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knlist_init(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv),
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NULL, NULL, NULL);
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knlist_init(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd),
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NULL, NULL, NULL);
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knlist_init_mtx(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv));
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knlist_init_mtx(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd));
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if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat) ||
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(*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
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sodealloc(so);
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@ -1485,7 +1485,7 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
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aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
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aiocbe->inputcharge = 0;
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aiocbe->outputcharge = 0;
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knlist_init(&aiocbe->klist, AIO_MTX(ki), NULL, NULL, NULL);
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knlist_init_mtx(&aiocbe->klist, AIO_MTX(ki));
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error = ops->copyin(job, &aiocbe->uaiocb);
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if (error) {
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@ -2107,7 +2107,7 @@ kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list,
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lj->lioj_flags = 0;
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lj->lioj_count = 0;
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lj->lioj_finished_count = 0;
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knlist_init(&lj->klist, AIO_MTX(ki), NULL, NULL, NULL);
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knlist_init_mtx(&lj->klist, AIO_MTX(ki));
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ksiginfo_init(&lj->lioj_ksi);
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/*
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@ -110,7 +110,8 @@ static void vnlru_free(int);
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static void vgonel(struct vnode *);
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static void vfs_knllock(void *arg);
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static void vfs_knlunlock(void *arg);
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static int vfs_knllocked(void *arg);
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static void vfs_knl_assert_locked(void *arg);
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static void vfs_knl_assert_unlocked(void *arg);
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static void destroy_vpollinfo(struct vpollinfo *vi);
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/*
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@ -3271,7 +3272,7 @@ v_addpollinfo(struct vnode *vp)
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vi = uma_zalloc(vnodepoll_zone, M_WAITOK);
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mtx_init(&vi->vpi_lock, "vnode pollinfo", NULL, MTX_DEF);
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knlist_init(&vi->vpi_selinfo.si_note, vp, vfs_knllock,
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vfs_knlunlock, vfs_knllocked);
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vfs_knlunlock, vfs_knl_assert_locked, vfs_knl_assert_unlocked);
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VI_LOCK(vp);
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if (vp->v_pollinfo != NULL) {
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VI_UNLOCK(vp);
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@ -3986,7 +3987,7 @@ static struct knlist fs_knlist;
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static void
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vfs_event_init(void *arg)
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{
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knlist_init(&fs_knlist, NULL, NULL, NULL, NULL);
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knlist_init_mtx(&fs_knlist, NULL);
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}
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/* XXX - correct order? */
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SYSINIT(vfs_knlist, SI_SUB_VFS, SI_ORDER_ANY, vfs_event_init, NULL);
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@ -4099,12 +4100,24 @@ vfs_knlunlock(void *arg)
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VOP_UNLOCK(vp, 0);
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}
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static int
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vfs_knllocked(void *arg)
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static void
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vfs_knl_assert_locked(void *arg)
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{
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#ifdef DEBUG_VFS_LOCKS
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struct vnode *vp = arg;
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return (VOP_ISLOCKED(vp) == LK_EXCLUSIVE);
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ASSERT_VOP_LOCKED(vp, "vfs_knl_assert_locked");
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#endif
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}
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static void
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vfs_knl_assert_unlocked(void *arg)
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{
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#ifdef DEBUG_VFS_LOCKS
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struct vnode *vp = arg;
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ASSERT_VOP_UNLOCKED(vp, "vfs_knl_assert_unlocked");
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#endif
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}
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int
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@ -4157,27 +4170,37 @@ filt_vfsread(struct knote *kn, long hint)
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{
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struct vnode *vp = (struct vnode *)kn->kn_hook;
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struct vattr va;
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int res;
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/*
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* filesystem is gone, so set the EOF flag and schedule
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* the knote for deletion.
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*/
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if (hint == NOTE_REVOKE) {
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VI_LOCK(vp);
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kn->kn_flags |= (EV_EOF | EV_ONESHOT);
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VI_UNLOCK(vp);
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return (1);
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}
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if (VOP_GETATTR(vp, &va, curthread->td_ucred))
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return (0);
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VI_LOCK(vp);
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kn->kn_data = va.va_size - kn->kn_fp->f_offset;
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return (kn->kn_data != 0);
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res = (kn->kn_data != 0);
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VI_UNLOCK(vp);
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return (res);
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}
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/*ARGSUSED*/
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static int
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filt_vfswrite(struct knote *kn, long hint)
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{
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struct vnode *vp = (struct vnode *)kn->kn_hook;
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VI_LOCK(vp);
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/*
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* filesystem is gone, so set the EOF flag and schedule
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* the knote for deletion.
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@ -4186,19 +4209,27 @@ filt_vfswrite(struct knote *kn, long hint)
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kn->kn_flags |= (EV_EOF | EV_ONESHOT);
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kn->kn_data = 0;
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VI_UNLOCK(vp);
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return (1);
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}
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static int
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filt_vfsvnode(struct knote *kn, long hint)
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{
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struct vnode *vp = (struct vnode *)kn->kn_hook;
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int res;
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VI_LOCK(vp);
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if (kn->kn_sfflags & hint)
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kn->kn_fflags |= hint;
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if (hint == NOTE_REVOKE) {
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kn->kn_flags |= EV_EOF;
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VI_UNLOCK(vp);
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return (1);
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}
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return (kn->kn_fflags != 0);
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res = (kn->kn_fflags != 0);
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VI_UNLOCK(vp);
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return (res);
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}
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int
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@ -648,7 +648,7 @@ bpfopen(struct cdev *dev, int flags, int fmt, struct thread *td)
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#endif
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mtx_init(&d->bd_mtx, devtoname(dev), "bpf cdev lock", MTX_DEF);
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callout_init(&d->bd_callout, CALLOUT_MPSAFE);
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knlist_init(&d->bd_sel.si_note, &d->bd_mtx, NULL, NULL, NULL);
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knlist_init_mtx(&d->bd_sel.si_note, &d->bd_mtx);
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return (0);
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}
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@ -445,7 +445,7 @@ vnet_net_iattach(const void *unused __unused)
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TAILQ_INIT(&V_ifnet);
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TAILQ_INIT(&V_ifg_head);
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knlist_init(&V_ifklist, NULL, NULL, NULL, NULL);
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knlist_init_mtx(&V_ifklist, NULL);
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if_grow(); /* create initial table */
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return (0);
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@ -548,7 +548,7 @@ if_alloc(u_char type)
|
||||
TAILQ_INIT(&ifp->if_prefixhead);
|
||||
TAILQ_INIT(&ifp->if_multiaddrs);
|
||||
TAILQ_INIT(&ifp->if_groups);
|
||||
knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL);
|
||||
knlist_init_mtx(&ifp->if_klist, NULL);
|
||||
#ifdef MAC
|
||||
mac_ifnet_init(ifp);
|
||||
#endif
|
||||
|
@ -462,7 +462,7 @@ tapcreate(struct cdev *dev)
|
||||
tp->tap_flags |= TAP_INITED;
|
||||
mtx_unlock(&tp->tap_mtx);
|
||||
|
||||
knlist_init(&tp->tap_rsel.si_note, NULL, NULL, NULL, NULL);
|
||||
knlist_init_mtx(&tp->tap_rsel.si_note, NULL);
|
||||
|
||||
TAPDEBUG("interface %s is created. minor = %#x\n",
|
||||
ifp->if_xname, dev2unit(dev));
|
||||
|
@ -391,7 +391,7 @@ tuncreate(const char *name, struct cdev *dev)
|
||||
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
|
||||
ifp->if_snd.ifq_drv_maxlen = 0;
|
||||
IFQ_SET_READY(&ifp->if_snd);
|
||||
knlist_init(&sc->tun_rsel.si_note, NULL, NULL, NULL, NULL);
|
||||
knlist_init_mtx(&sc->tun_rsel.si_note, NULL);
|
||||
|
||||
if_attach(ifp);
|
||||
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
|
||||
|
@ -579,8 +579,7 @@ audit_pipe_alloc(void)
|
||||
return (NULL);
|
||||
ap->ap_qlimit = AUDIT_PIPE_QLIMIT_DEFAULT;
|
||||
TAILQ_INIT(&ap->ap_queue);
|
||||
knlist_init(&ap->ap_selinfo.si_note, AUDIT_PIPE_MTX(ap), NULL, NULL,
|
||||
NULL);
|
||||
knlist_init_mtx(&ap->ap_selinfo.si_note, AUDIT_PIPE_MTX(ap));
|
||||
AUDIT_PIPE_LOCK_INIT(ap);
|
||||
AUDIT_PIPE_SX_LOCK_INIT(ap);
|
||||
cv_init(&ap->ap_cv, "audit_pipe");
|
||||
|
@ -124,7 +124,8 @@ struct knlist {
|
||||
struct klist kl_list;
|
||||
void (*kl_lock)(void *); /* lock function */
|
||||
void (*kl_unlock)(void *);
|
||||
int (*kl_locked)(void *);
|
||||
void (*kl_assert_locked)(void *);
|
||||
void (*kl_assert_unlocked)(void *);
|
||||
void *kl_lockarg; /* argument passed to kl_lockf() */
|
||||
};
|
||||
|
||||
@ -203,6 +204,7 @@ struct kevent_copyops {
|
||||
struct thread;
|
||||
struct proc;
|
||||
struct knlist;
|
||||
struct mtx;
|
||||
|
||||
extern void knote(struct knlist *list, long hint, int islocked);
|
||||
extern void knote_fork(struct knlist *list, int pid);
|
||||
@ -212,7 +214,8 @@ extern void knlist_remove_inevent(struct knlist *knl, struct knote *kn);
|
||||
extern int knlist_empty(struct knlist *knl);
|
||||
extern void knlist_init(struct knlist *knl, void *lock,
|
||||
void (*kl_lock)(void *), void (*kl_unlock)(void *),
|
||||
int (*kl_locked)(void *));
|
||||
void (*kl_assert_locked)(void *), void (*kl_assert_unlocked)(void *));
|
||||
extern void knlist_init_mtx(struct knlist *knl, struct mtx *lock);
|
||||
extern void knlist_destroy(struct knlist *knl);
|
||||
extern void knlist_cleardel(struct knlist *knl, struct thread *td,
|
||||
int islocked, int killkn);
|
||||
|
Loading…
Reference in New Issue
Block a user