AF_UNIX: make unix socket locking finer grained
This change moves to using a reference count across lock drop / reacquire
to guarantee liveness.
Currently sends on unix sockets contend heavily on read locking the list lock.
unix1_processes in will-it-scale peaks at 6 processes and then declines.
With this change I get a substantial improvement in number of operations per second
with 96 processes:
x before
+ after
N Min Max Median Avg Stddev
x 11 1688420 1696389 1693578 1692766.3 2971.1702
+ 10 63417955 71030114 70662504 69576423 2374684.6
Difference at 95.0% confidence
6.78837e+07 +/- 1.49463e+06
4010.22% +/- 88.4246%
(Student's t, pooled s = 1.63437e+06)
And even for 2 processes shows a ~18% improvement.
"Small" iron changes (1, 2, and 4 processes):
x before1
+ after1.2
+------------------------------------------------------------------------+
| + |
| x + |
| x + |
| x + |
| x ++ |
| xx ++ |
|x x xx ++ |
| |__________________A_____M_____AM____||
+------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 10 1131648 1197750 1197138.5 1190369.3 20651.839
+ 10 1203840 1205056 1204919 1204827.9 353.27404
Difference at 95.0% confidence
14458.6 +/- 13723
1.21463% +/- 1.16683%
(Student's t, pooled s = 14605.2)
x before2
+ after2.2
+------------------------------------------------------------------------+
| +|
| +|
| +|
| +|
| +|
| +|
| x +|
| x +|
| x xx +|
|x xxxx +|
| |___AM_| A|
+------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 10 1972843 2045866 2038186.5 2030443.8 21367.694
+ 10 2400853 2402196 2401043.5 2401172.7 385.40024
Difference at 95.0% confidence
370729 +/- 14198.9
18.2585% +/- 0.826943%
(Student's t, pooled s = 15111.7)
x before4
+ after4.2
N Min Max Median Avg Stddev
x 10 3986994 3991728 3990137.5 3989985.2 1300.0164
+ 10 4799990 4806664 4806116.5 4805194 1990.6625
Difference at 95.0% confidence
815209 +/- 1579.64
20.4314% +/- 0.0421713%
(Student's t, pooled s = 1681.19)
Tested by: pho
Reported by: mjg
Approved by: sbruno
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D15430
This commit is contained in:
Matt Macy
parent
087522b840
commit
75a67bf3d0
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=333744
@ -191,12 +191,40 @@ SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
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/*
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* Locking and synchronization:
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*
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* Two types of locks exist in the local domain socket implementation: a
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* a global linkage rwlock and per-unpcb mutexes. The linkage lock protects
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* the socket count, global generation number, stream/datagram global lists and
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* interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
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* held exclusively over the acquisition of multiple unpcb locks to prevent
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* deadlock.
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* Three types of locks exist in the local domain socket implementation: a
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* a global linkage rwlock, the mtxpool lock, and per-unpcb mutexes.
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* The linkage lock protects the socket count, global generation number,
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* and stream/datagram global lists.
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*
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* The mtxpool lock protects the vnode from being modified while referenced.
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* Lock ordering requires that it be acquired before any unpcb locks.
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*
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* The unpcb lock (unp_mtx) protects all fields in the unpcb. Of particular
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* note is that this includes the unp_conn field. So long as the unpcb lock
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* is held the reference to the unpcb pointed to by unp_conn is valid. If we
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* require that the unpcb pointed to by unp_conn remain live in cases where
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* we need to drop the unp_mtx as when we need to acquire the lock for a
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* second unpcb the caller must first acquire an additional reference on the
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* second unpcb and then revalidate any state (typically check that unp_conn
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* is non-NULL) upon requiring the initial unpcb lock. The lock ordering
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* between unpcbs is the conventional ascending address order. Two helper
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* routines exist for this:
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*
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* - unp_pcb_lock2(unp, unp2) - which just acquires the two locks in the
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* safe ordering.
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*
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* - unp_pcb_owned_lock2(unp, unp2, freed) - the lock for unp is held
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* when called. If unp is unlocked and unp2 is subsequently freed
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* freed will be set to 1.
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*
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* The helper routines for references are:
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*
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* - unp_pcb_hold(unp): Can be called any time we currently hold a valid
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* reference to unp.
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*
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* - unp_pcb_rele(unp): The caller must hold the unp lock. If we are
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* releasing the last reference, detach must have been called thus
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* unp->unp_socket be NULL.
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*
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* UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
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* allocated in pru_attach() and freed in pru_detach(). The validity of that
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@ -210,15 +238,8 @@ SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
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* to the unpcb is held. Typically, this reference will be from the socket,
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* or from another unpcb when the referring unpcb's lock is held (in order
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* that the reference not be invalidated during use). For example, to follow
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* unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
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* as unp_socket remains valid as long as the reference to unp_conn is valid.
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*
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* Fields of unpcbss are locked using a per-unpcb lock, unp_mtx. Individual
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* atomic reads without the lock may be performed "lockless", but more
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* complex reads and read-modify-writes require the mutex to be held. No
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* lock order is defined between unpcb locks -- multiple unpcb locks may be
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* acquired at the same time only when holding the linkage rwlock
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* exclusively, which prevents deadlocks.
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* unp->unp_conn->unp_socket, you need to hold a lock on unp_conn to guarantee
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* that detach is not run clearing unp_socket.
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*
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* Blocking with UNIX domain sockets is a tricky issue: unlike most network
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* protocols, bind() is a non-atomic operation, and connect() requires
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@ -257,13 +278,19 @@ static struct mtx unp_defers_lock;
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#define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock)
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#define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock)
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#define UNP_REF_LIST_LOCK() UNP_DEFERRED_LOCK();
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#define UNP_REF_LIST_UNLOCK() UNP_DEFERRED_UNLOCK();
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#define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
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"unp_mtx", "unp_mtx", \
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MTX_DUPOK|MTX_DEF|MTX_RECURSE)
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MTX_DUPOK|MTX_DEF)
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#define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
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#define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
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#define UNP_PCB_TRYLOCK(unp) mtx_trylock(&(unp)->unp_mtx)
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#define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
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#define UNP_PCB_OWNED(unp) mtx_owned(&(unp)->unp_mtx)
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#define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
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#define UNP_PCB_UNLOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_NOTOWNED)
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static int uipc_connect2(struct socket *, struct socket *);
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static int uipc_ctloutput(struct socket *, struct sockopt *);
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@ -289,6 +316,75 @@ static int unp_externalize_fp(struct file *);
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static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
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static void unp_process_defers(void * __unused, int);
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static void
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unp_pcb_hold(struct unpcb *unp)
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{
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MPASS(unp->unp_refcount);
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refcount_acquire(&unp->unp_refcount);
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}
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static int
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unp_pcb_rele(struct unpcb *unp)
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{
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int freed;
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UNP_PCB_LOCK_ASSERT(unp);
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MPASS(unp->unp_refcount);
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if ((freed = refcount_release(&unp->unp_refcount))) {
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/* we got here with having detached? */
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MPASS(unp->unp_socket == NULL);
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UNP_PCB_UNLOCK(unp);
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UNP_PCB_LOCK_DESTROY(unp);
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uma_zfree(unp_zone, unp);
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}
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return (freed);
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}
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static void
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unp_pcb_lock2(struct unpcb *unp, struct unpcb *unp2)
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{
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UNP_PCB_UNLOCK_ASSERT(unp);
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UNP_PCB_UNLOCK_ASSERT(unp2);
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if ((uintptr_t)unp2 > (uintptr_t)unp) {
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UNP_PCB_LOCK(unp);
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UNP_PCB_LOCK(unp2);
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} else {
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UNP_PCB_LOCK(unp2);
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UNP_PCB_LOCK(unp);
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}
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}
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static __noinline void
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unp_pcb_owned_lock2_slowpath(struct unpcb *unp, struct unpcb **unp2p, int *freed)
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{
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struct unpcb *unp2;
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unp2 = *unp2p;
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unp_pcb_hold((unp2));
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UNP_PCB_UNLOCK((unp));
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UNP_PCB_LOCK((unp2));
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UNP_PCB_LOCK((unp));
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*freed = unp_pcb_rele((unp2));
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if (*freed)
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*unp2p = NULL;
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}
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#define unp_pcb_owned_lock2(unp, unp2, freed) do { \
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freed = 0; \
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UNP_PCB_LOCK_ASSERT((unp)); \
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UNP_PCB_UNLOCK_ASSERT((unp2)); \
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if (__predict_true(UNP_PCB_TRYLOCK((unp2)))) \
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break; \
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else if ((uintptr_t)(unp2) > (uintptr_t)(unp)) \
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UNP_PCB_LOCK((unp2)); \
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else { \
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unp_pcb_owned_lock2_slowpath((unp), &(unp2), &freed); \
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} \
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} while (0)
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/*
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* Definitions of protocols supported in the LOCAL domain.
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*/
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@ -344,17 +440,16 @@ uipc_abort(struct socket *so)
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unp = sotounpcb(so);
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KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
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UNP_PCB_UNLOCK_ASSERT(unp);
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UNP_LINK_WLOCK();
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UNP_PCB_LOCK(unp);
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unp2 = unp->unp_conn;
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if (unp2 != NULL) {
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UNP_PCB_LOCK(unp2);
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unp_pcb_hold(unp2);
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UNP_PCB_UNLOCK(unp);
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unp_drop(unp2);
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UNP_PCB_UNLOCK(unp2);
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}
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UNP_PCB_UNLOCK(unp);
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UNP_LINK_WUNLOCK();
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} else
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UNP_PCB_UNLOCK(unp);
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}
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static int
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@ -551,14 +646,12 @@ uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
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ASSERT_VOP_ELOCKED(vp, "uipc_bind");
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soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
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UNP_LINK_WLOCK();
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UNP_PCB_LOCK(unp);
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VOP_UNP_BIND(vp, unp);
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unp->unp_vnode = vp;
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unp->unp_addr = soun;
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unp->unp_flags &= ~UNP_BINDING;
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UNP_PCB_UNLOCK(unp);
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UNP_LINK_WUNLOCK();
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VOP_UNLOCK(vp, 0);
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vn_finished_write(mp);
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free(buf, M_TEMP);
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@ -585,9 +678,7 @@ uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
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int error;
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KASSERT(td == curthread, ("uipc_connect: td != curthread"));
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UNP_LINK_WLOCK();
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error = unp_connect(so, nam, td);
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UNP_LINK_WUNLOCK();
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return (error);
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}
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@ -598,9 +689,7 @@ uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
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int error;
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KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
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UNP_LINK_WLOCK();
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error = unp_connectat(fd, so, nam, td);
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UNP_LINK_WUNLOCK();
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return (error);
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}
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@ -609,26 +698,41 @@ uipc_close(struct socket *so)
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{
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struct unpcb *unp, *unp2;
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struct vnode *vp = NULL;
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struct mtx *vplock;
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int freed;
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unp = sotounpcb(so);
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KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
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UNP_LINK_WLOCK();
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UNP_PCB_LOCK(unp);
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unp2 = unp->unp_conn;
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if (unp2 != NULL) {
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UNP_PCB_LOCK(unp2);
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unp_disconnect(unp, unp2);
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UNP_PCB_UNLOCK(unp2);
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vplock = NULL;
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if ((vp = unp->unp_vnode) != NULL) {
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vplock = mtx_pool_find(mtxpool_sleep, vp);
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mtx_lock(vplock);
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}
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if (SOLISTENING(so) && ((vp = unp->unp_vnode) != NULL)) {
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UNP_PCB_LOCK(unp);
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if (vp && unp->unp_vnode == NULL) {
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mtx_unlock(vplock);
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vp = NULL;
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}
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if (vp != NULL) {
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VOP_UNP_DETACH(vp);
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unp->unp_vnode = NULL;
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}
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UNP_PCB_UNLOCK(unp);
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UNP_LINK_WUNLOCK();
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if (vp)
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unp2 = unp->unp_conn;
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unp_pcb_hold(unp);
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if (unp2 != NULL) {
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unp_pcb_hold(unp2);
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unp_pcb_owned_lock2(unp, unp2, freed);
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unp_disconnect(unp, unp2);
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if (unp_pcb_rele(unp2) == 0)
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UNP_PCB_UNLOCK(unp2);
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}
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if (unp_pcb_rele(unp) == 0)
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UNP_PCB_UNLOCK(unp);
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if (vp) {
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mtx_unlock(vplock);
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vrele(vp);
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}
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}
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static int
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@ -637,17 +741,14 @@ uipc_connect2(struct socket *so1, struct socket *so2)
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struct unpcb *unp, *unp2;
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int error;
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UNP_LINK_WLOCK();
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unp = so1->so_pcb;
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KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
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UNP_PCB_LOCK(unp);
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unp2 = so2->so_pcb;
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KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
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UNP_PCB_LOCK(unp2);
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unp_pcb_lock2(unp, unp2);
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error = unp_connect2(so1, so2, PRU_CONNECT2);
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UNP_PCB_UNLOCK(unp2);
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UNP_PCB_UNLOCK(unp);
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UNP_LINK_WUNLOCK();
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return (error);
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}
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@ -655,6 +756,7 @@ static void
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uipc_detach(struct socket *so)
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{
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struct unpcb *unp, *unp2;
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struct mtx *vplock;
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struct sockaddr_un *saved_unp_addr;
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struct vnode *vp;
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int freeunp, local_unp_rights;
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@ -669,49 +771,77 @@ uipc_detach(struct socket *so)
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LIST_REMOVE(unp, unp_link);
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unp->unp_gencnt = ++unp_gencnt;
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--unp_count;
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UNP_PCB_LOCK(unp);
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if ((unp->unp_flags & UNP_NASCENT) != 0)
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goto teardown;
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UNP_LINK_WUNLOCK();
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UNP_PCB_UNLOCK_ASSERT(unp);
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restart:
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if ((vp = unp->unp_vnode) != NULL) {
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vplock = mtx_pool_find(mtxpool_sleep, vp);
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mtx_lock(vplock);
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}
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UNP_PCB_LOCK(unp);
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if ((unp2 = unp->unp_conn) != NULL) {
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unp_pcb_owned_lock2(unp, unp2, freeunp);
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if (freeunp)
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unp2 = NULL;
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}
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if (unp->unp_vnode != vp &&
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unp->unp_vnode != NULL) {
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mtx_unlock(vplock);
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UNP_PCB_UNLOCK(unp);
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if (unp2)
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UNP_PCB_UNLOCK(unp2);
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goto restart;
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}
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if ((unp->unp_flags & UNP_NASCENT) != 0) {
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if (unp2)
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UNP_PCB_UNLOCK(unp2);
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goto teardown;
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}
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if ((vp = unp->unp_vnode) != NULL) {
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VOP_UNP_DETACH(vp);
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unp->unp_vnode = NULL;
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}
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unp2 = unp->unp_conn;
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unp_pcb_hold(unp);
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if (unp2 != NULL) {
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UNP_PCB_LOCK(unp2);
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unp_pcb_hold(unp2);
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unp_disconnect(unp, unp2);
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UNP_PCB_UNLOCK(unp2);
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if (unp_pcb_rele(unp2) == 0)
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UNP_PCB_UNLOCK(unp2);
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}
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/*
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* We hold the linkage lock exclusively, so it's OK to acquire
|
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* multiple pcb locks at a time.
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*/
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UNP_PCB_UNLOCK(unp);
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UNP_REF_LIST_LOCK();
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while (!LIST_EMPTY(&unp->unp_refs)) {
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struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
|
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UNP_PCB_LOCK(ref);
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unp_pcb_hold(ref);
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UNP_REF_LIST_UNLOCK();
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MPASS(ref != unp);
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UNP_PCB_UNLOCK_ASSERT(ref);
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||||
unp_drop(ref);
|
||||
UNP_PCB_UNLOCK(ref);
|
||||
UNP_REF_LIST_LOCK();
|
||||
}
|
||||
|
||||
UNP_REF_LIST_UNLOCK();
|
||||
UNP_PCB_LOCK(unp);
|
||||
freeunp = unp_pcb_rele(unp);
|
||||
MPASS(freeunp == 0);
|
||||
local_unp_rights = unp_rights;
|
||||
teardown:
|
||||
UNP_LINK_WUNLOCK();
|
||||
unp->unp_socket->so_pcb = NULL;
|
||||
saved_unp_addr = unp->unp_addr;
|
||||
unp->unp_addr = NULL;
|
||||
unp->unp_refcount--;
|
||||
freeunp = (unp->unp_refcount == 0);
|
||||
unp->unp_socket = NULL;
|
||||
freeunp = unp_pcb_rele(unp);
|
||||
if (saved_unp_addr != NULL)
|
||||
free(saved_unp_addr, M_SONAME);
|
||||
if (freeunp) {
|
||||
UNP_PCB_LOCK_DESTROY(unp);
|
||||
uma_zfree(unp_zone, unp);
|
||||
} else
|
||||
if (!freeunp)
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
if (vp)
|
||||
if (vp) {
|
||||
mtx_unlock(vplock);
|
||||
vrele(vp);
|
||||
}
|
||||
if (local_unp_rights)
|
||||
taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
|
||||
}
|
||||
@ -720,20 +850,28 @@ static int
|
||||
uipc_disconnect(struct socket *so)
|
||||
{
|
||||
struct unpcb *unp, *unp2;
|
||||
int freed;
|
||||
|
||||
unp = sotounpcb(so);
|
||||
KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
|
||||
|
||||
UNP_LINK_WLOCK();
|
||||
UNP_PCB_LOCK(unp);
|
||||
unp2 = unp->unp_conn;
|
||||
if (unp2 != NULL) {
|
||||
UNP_PCB_LOCK(unp2);
|
||||
unp_disconnect(unp, unp2);
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
if ((unp2 = unp->unp_conn) == NULL) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
return (0);
|
||||
}
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
UNP_LINK_WUNLOCK();
|
||||
unp_pcb_owned_lock2(unp, unp2, freed);
|
||||
if (__predict_false(freed)) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
return (0);
|
||||
}
|
||||
unp_pcb_hold(unp2);
|
||||
unp_pcb_hold(unp);
|
||||
unp_disconnect(unp, unp2);
|
||||
if (unp_pcb_rele(unp) == 0)
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
if (unp_pcb_rele(unp2) == 0)
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
return (0);
|
||||
}
|
||||
|
||||
@ -851,6 +989,28 @@ uipc_rcvd(struct socket *so, int flags)
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
connect_internal(struct socket *so, struct sockaddr *nam, struct thread *td)
|
||||
{
|
||||
int error;
|
||||
struct unpcb *unp;
|
||||
|
||||
unp = so->so_pcb;
|
||||
if (unp->unp_conn != NULL)
|
||||
return (EISCONN);
|
||||
error = unp_connect(so, nam, td);
|
||||
if (error)
|
||||
return (error);
|
||||
UNP_PCB_LOCK(unp);
|
||||
if (unp->unp_conn == NULL) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
if (error == 0)
|
||||
error = ENOTCONN;
|
||||
}
|
||||
return (error);
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
||||
struct mbuf *control, struct thread *td)
|
||||
@ -858,7 +1018,7 @@ uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
||||
struct unpcb *unp, *unp2;
|
||||
struct socket *so2;
|
||||
u_int mbcnt, sbcc;
|
||||
int error = 0;
|
||||
int freed, error;
|
||||
|
||||
unp = sotounpcb(so);
|
||||
KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
|
||||
@ -866,49 +1026,66 @@ uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
||||
so->so_type == SOCK_SEQPACKET,
|
||||
("%s: socktype %d", __func__, so->so_type));
|
||||
|
||||
freed = error = 0;
|
||||
if (flags & PRUS_OOB) {
|
||||
error = EOPNOTSUPP;
|
||||
goto release;
|
||||
}
|
||||
if (control != NULL && (error = unp_internalize(&control, td)))
|
||||
goto release;
|
||||
if ((nam != NULL) || (flags & PRUS_EOF))
|
||||
UNP_LINK_WLOCK();
|
||||
else
|
||||
UNP_LINK_RLOCK();
|
||||
|
||||
unp2 = NULL;
|
||||
switch (so->so_type) {
|
||||
case SOCK_DGRAM:
|
||||
{
|
||||
const struct sockaddr *from;
|
||||
|
||||
unp2 = unp->unp_conn;
|
||||
if (nam != NULL) {
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
if (unp2 != NULL) {
|
||||
error = EISCONN;
|
||||
/*
|
||||
* We return with UNP_PCB_LOCK_HELD so we know that
|
||||
* the reference is live if the pointer is valid.
|
||||
*/
|
||||
if ((error = connect_internal(so, nam, td)))
|
||||
break;
|
||||
MPASS(unp->unp_conn != NULL);
|
||||
unp2 = unp->unp_conn;
|
||||
} else {
|
||||
UNP_PCB_LOCK(unp);
|
||||
|
||||
/*
|
||||
* Because connect() and send() are non-atomic in a sendto()
|
||||
* with a target address, it's possible that the socket will
|
||||
* have disconnected before the send() can run. In that case
|
||||
* return the slightly counter-intuitive but otherwise
|
||||
* correct error that the socket is not connected.
|
||||
*/
|
||||
if ((unp2 = unp->unp_conn) == NULL) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
}
|
||||
error = unp_connect(so, nam, td);
|
||||
if (error)
|
||||
break;
|
||||
unp2 = unp->unp_conn;
|
||||
}
|
||||
|
||||
/*
|
||||
* Because connect() and send() are non-atomic in a sendto()
|
||||
* with a target address, it's possible that the socket will
|
||||
* have disconnected before the send() can run. In that case
|
||||
* return the slightly counter-intuitive but otherwise
|
||||
* correct error that the socket is not connected.
|
||||
*/
|
||||
if (unp2 == NULL) {
|
||||
unp_pcb_owned_lock2(unp, unp2, freed);
|
||||
if (__predict_false(freed)) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
}
|
||||
/*
|
||||
* The socket referencing unp2 may have been closed
|
||||
* or unp may have been disconnected if the unp lock
|
||||
* was dropped to acquire unp2.
|
||||
*/
|
||||
if (__predict_false(unp->unp_conn == NULL) ||
|
||||
unp2->unp_socket == NULL) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
if (unp_pcb_rele(unp2) == 0)
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
}
|
||||
/* Lockless read. */
|
||||
if (unp2->unp_flags & UNP_WANTCRED)
|
||||
control = unp_addsockcred(td, control);
|
||||
UNP_PCB_LOCK(unp);
|
||||
if (unp->unp_addr != NULL)
|
||||
from = (struct sockaddr *)unp->unp_addr;
|
||||
else
|
||||
@ -924,12 +1101,9 @@ uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
||||
SOCKBUF_UNLOCK(&so2->so_rcv);
|
||||
error = ENOBUFS;
|
||||
}
|
||||
if (nam != NULL) {
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
UNP_PCB_LOCK(unp2);
|
||||
if (nam != NULL)
|
||||
unp_disconnect(unp, unp2);
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
}
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
break;
|
||||
}
|
||||
@ -938,42 +1112,37 @@ uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
||||
case SOCK_STREAM:
|
||||
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
||||
if (nam != NULL) {
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
error = unp_connect(so, nam, td);
|
||||
if (error)
|
||||
break; /* XXX */
|
||||
} else {
|
||||
if ((error = connect_internal(so, nam, td)))
|
||||
break;
|
||||
} else {
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
}
|
||||
} else if ((unp2 = unp->unp_conn) == NULL) {
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
} else if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
||||
error = EPIPE;
|
||||
break;
|
||||
} else {
|
||||
UNP_PCB_LOCK(unp);
|
||||
if ((unp2 = unp->unp_conn) == NULL) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Lockless read. */
|
||||
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
||||
error = EPIPE;
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Because connect() and send() are non-atomic in a sendto()
|
||||
* with a target address, it's possible that the socket will
|
||||
* have disconnected before the send() can run. In that case
|
||||
* return the slightly counter-intuitive but otherwise
|
||||
* correct error that the socket is not connected.
|
||||
*
|
||||
* Locking here must be done carefully: the linkage lock
|
||||
* prevents interconnections between unpcbs from changing, so
|
||||
* we can traverse from unp to unp2 without acquiring unp's
|
||||
* lock. Socket buffer locks follow unpcb locks, so we can
|
||||
* acquire both remote and lock socket buffer locks.
|
||||
*/
|
||||
unp2 = unp->unp_conn;
|
||||
if (unp2 == NULL) {
|
||||
unp_pcb_owned_lock2(unp, unp2, freed);
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
if (__predict_false(freed)) {
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
}
|
||||
if ((so2 = unp2->unp_socket) == NULL) {
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
error = ENOTCONN;
|
||||
break;
|
||||
}
|
||||
so2 = unp2->unp_socket;
|
||||
UNP_PCB_LOCK(unp2);
|
||||
SOCKBUF_LOCK(&so2->so_rcv);
|
||||
if (unp2->unp_flags & UNP_WANTCRED) {
|
||||
/*
|
||||
@ -1046,12 +1215,6 @@ uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
||||
unp_shutdown(unp);
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
}
|
||||
|
||||
if ((nam != NULL) || (flags & PRUS_EOF))
|
||||
UNP_LINK_WUNLOCK();
|
||||
else
|
||||
UNP_LINK_RUNLOCK();
|
||||
|
||||
if (control != NULL && error != 0)
|
||||
unp_dispose_mbuf(control);
|
||||
|
||||
@ -1124,12 +1287,10 @@ uipc_shutdown(struct socket *so)
|
||||
unp = sotounpcb(so);
|
||||
KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
|
||||
|
||||
UNP_LINK_WLOCK();
|
||||
UNP_PCB_LOCK(unp);
|
||||
socantsendmore(so);
|
||||
unp_shutdown(unp);
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
UNP_LINK_WUNLOCK();
|
||||
return (0);
|
||||
}
|
||||
|
||||
@ -1333,16 +1494,11 @@ unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
||||
char buf[SOCK_MAXADDRLEN];
|
||||
struct sockaddr *sa;
|
||||
cap_rights_t rights;
|
||||
int error, len;
|
||||
int error, len, freed;
|
||||
struct mtx *vplock;
|
||||
|
||||
if (nam->sa_family != AF_UNIX)
|
||||
return (EAFNOSUPPORT);
|
||||
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
|
||||
unp = sotounpcb(so);
|
||||
KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
|
||||
|
||||
if (nam->sa_len > sizeof(struct sockaddr_un))
|
||||
return (EINVAL);
|
||||
len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
|
||||
@ -1351,12 +1507,12 @@ unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
||||
bcopy(soun->sun_path, buf, len);
|
||||
buf[len] = 0;
|
||||
|
||||
unp = sotounpcb(so);
|
||||
UNP_PCB_LOCK(unp);
|
||||
if (unp->unp_flags & UNP_CONNECTING) {
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
return (EALREADY);
|
||||
}
|
||||
UNP_LINK_WUNLOCK();
|
||||
unp->unp_flags |= UNP_CONNECTING;
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
|
||||
@ -1389,11 +1545,8 @@ unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
||||
unp = sotounpcb(so);
|
||||
KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
|
||||
|
||||
/*
|
||||
* Lock linkage lock for two reasons: make sure v_socket is stable,
|
||||
* and to protect simultaneous locking of multiple pcbs.
|
||||
*/
|
||||
UNP_LINK_WLOCK();
|
||||
vplock = mtx_pool_find(mtxpool_sleep, vp);
|
||||
mtx_lock(vplock);
|
||||
VOP_UNP_CONNECT(vp, &unp2);
|
||||
if (unp2 == NULL) {
|
||||
error = ECONNREFUSED;
|
||||
@ -1404,8 +1557,7 @@ unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
||||
error = EPROTOTYPE;
|
||||
goto bad2;
|
||||
}
|
||||
UNP_PCB_LOCK(unp);
|
||||
UNP_PCB_LOCK(unp2);
|
||||
unp_pcb_lock2(unp, unp2);
|
||||
if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
|
||||
if (so2->so_options & SO_ACCEPTCONN) {
|
||||
CURVNET_SET(so2->so_vnet);
|
||||
@ -1418,7 +1570,9 @@ unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
||||
goto bad3;
|
||||
}
|
||||
unp3 = sotounpcb(so2);
|
||||
UNP_PCB_LOCK(unp3);
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
unp_pcb_owned_lock2(unp2, unp3, freed);
|
||||
MPASS(!freed);
|
||||
if (unp2->unp_addr != NULL) {
|
||||
bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
|
||||
unp3->unp_addr = (struct sockaddr_un *) sa;
|
||||
@ -1445,6 +1599,8 @@ unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
||||
unp3->unp_flags |= UNP_WANTCRED;
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
unp2 = unp3;
|
||||
unp_pcb_owned_lock2(unp2, unp, freed);
|
||||
MPASS(!freed);
|
||||
#ifdef MAC
|
||||
mac_socketpeer_set_from_socket(so, so2);
|
||||
mac_socketpeer_set_from_socket(so2, so);
|
||||
@ -1459,12 +1615,12 @@ unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
bad2:
|
||||
UNP_LINK_WUNLOCK();
|
||||
mtx_unlock(vplock);
|
||||
bad:
|
||||
if (vp != NULL)
|
||||
if (vp != NULL) {
|
||||
vput(vp);
|
||||
}
|
||||
free(sa, M_SONAME);
|
||||
UNP_LINK_WLOCK();
|
||||
UNP_PCB_LOCK(unp);
|
||||
unp->unp_flags &= ~UNP_CONNECTING;
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
@ -1482,7 +1638,6 @@ unp_connect2(struct socket *so, struct socket *so2, int req)
|
||||
unp2 = sotounpcb(so2);
|
||||
KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
|
||||
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
UNP_PCB_LOCK_ASSERT(unp);
|
||||
UNP_PCB_LOCK_ASSERT(unp2);
|
||||
|
||||
@ -1490,10 +1645,13 @@ unp_connect2(struct socket *so, struct socket *so2, int req)
|
||||
return (EPROTOTYPE);
|
||||
unp2->unp_flags &= ~UNP_NASCENT;
|
||||
unp->unp_conn = unp2;
|
||||
|
||||
unp_pcb_hold(unp2);
|
||||
unp_pcb_hold(unp);
|
||||
switch (so->so_type) {
|
||||
case SOCK_DGRAM:
|
||||
UNP_REF_LIST_LOCK();
|
||||
LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
|
||||
UNP_REF_LIST_UNLOCK();
|
||||
soisconnected(so);
|
||||
break;
|
||||
|
||||
@ -1517,31 +1675,48 @@ unp_connect2(struct socket *so, struct socket *so2, int req)
|
||||
static void
|
||||
unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
|
||||
{
|
||||
struct socket *so;
|
||||
struct socket *so, *so2;
|
||||
int rele, freed;
|
||||
|
||||
KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
|
||||
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
UNP_PCB_LOCK_ASSERT(unp);
|
||||
UNP_PCB_LOCK_ASSERT(unp2);
|
||||
|
||||
if (unp->unp_conn == NULL && unp2->unp_conn == NULL)
|
||||
return;
|
||||
|
||||
MPASS(unp->unp_conn == unp2);
|
||||
unp->unp_conn = NULL;
|
||||
rele = 0;
|
||||
so = unp->unp_socket;
|
||||
so2 = unp2->unp_socket;
|
||||
switch (unp->unp_socket->so_type) {
|
||||
case SOCK_DGRAM:
|
||||
UNP_REF_LIST_LOCK();
|
||||
LIST_REMOVE(unp, unp_reflink);
|
||||
so = unp->unp_socket;
|
||||
SOCK_LOCK(so);
|
||||
so->so_state &= ~SS_ISCONNECTED;
|
||||
SOCK_UNLOCK(so);
|
||||
UNP_REF_LIST_UNLOCK();
|
||||
if (so) {
|
||||
SOCK_LOCK(so);
|
||||
so->so_state &= ~SS_ISCONNECTED;
|
||||
SOCK_UNLOCK(so);
|
||||
}
|
||||
break;
|
||||
|
||||
case SOCK_STREAM:
|
||||
case SOCK_SEQPACKET:
|
||||
soisdisconnected(unp->unp_socket);
|
||||
if (so)
|
||||
soisdisconnected(so);
|
||||
MPASS(unp2->unp_conn == unp);
|
||||
unp2->unp_conn = NULL;
|
||||
soisdisconnected(unp2->unp_socket);
|
||||
if (so2)
|
||||
soisdisconnected(so2);
|
||||
break;
|
||||
}
|
||||
freed = unp_pcb_rele(unp);
|
||||
MPASS(freed == 0);
|
||||
freed = unp_pcb_rele(unp2);
|
||||
MPASS(freed == 0);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1625,7 +1800,7 @@ unp_pcblist(SYSCTL_HANDLER_ARGS)
|
||||
continue;
|
||||
}
|
||||
unp_list[i++] = unp;
|
||||
unp->unp_refcount++;
|
||||
unp_pcb_hold(unp);
|
||||
}
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
}
|
||||
@ -1637,8 +1812,9 @@ unp_pcblist(SYSCTL_HANDLER_ARGS)
|
||||
for (i = 0; i < n; i++) {
|
||||
unp = unp_list[i];
|
||||
UNP_PCB_LOCK(unp);
|
||||
unp->unp_refcount--;
|
||||
if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
|
||||
freeunp = unp_pcb_rele(unp);
|
||||
|
||||
if (freeunp == 0 && unp->unp_gencnt <= gencnt) {
|
||||
xu->xu_len = sizeof *xu;
|
||||
xu->xu_unpp = unp;
|
||||
/*
|
||||
@ -1665,14 +1841,8 @@ unp_pcblist(SYSCTL_HANDLER_ARGS)
|
||||
sotoxsocket(unp->unp_socket, &xu->xu_socket);
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
error = SYSCTL_OUT(req, xu, sizeof *xu);
|
||||
} else {
|
||||
freeunp = (unp->unp_refcount == 0);
|
||||
} else if (freeunp == 0)
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
if (freeunp) {
|
||||
UNP_PCB_LOCK_DESTROY(unp);
|
||||
uma_zfree(unp_zone, unp);
|
||||
}
|
||||
}
|
||||
}
|
||||
free(xu, M_TEMP);
|
||||
if (!error) {
|
||||
@ -1709,7 +1879,6 @@ unp_shutdown(struct unpcb *unp)
|
||||
struct unpcb *unp2;
|
||||
struct socket *so;
|
||||
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
UNP_PCB_LOCK_ASSERT(unp);
|
||||
|
||||
unp2 = unp->unp_conn;
|
||||
@ -1726,22 +1895,28 @@ unp_drop(struct unpcb *unp)
|
||||
{
|
||||
struct socket *so = unp->unp_socket;
|
||||
struct unpcb *unp2;
|
||||
|
||||
UNP_LINK_WLOCK_ASSERT();
|
||||
UNP_PCB_LOCK_ASSERT(unp);
|
||||
int freed;
|
||||
|
||||
/*
|
||||
* Regardless of whether the socket's peer dropped the connection
|
||||
* with this socket by aborting or disconnecting, POSIX requires
|
||||
* that ECONNRESET is returned.
|
||||
*/
|
||||
so->so_error = ECONNRESET;
|
||||
/* acquire a reference so that unp isn't freed from underneath us */
|
||||
|
||||
UNP_PCB_LOCK(unp);
|
||||
if (so)
|
||||
so->so_error = ECONNRESET;
|
||||
unp2 = unp->unp_conn;
|
||||
if (unp2 == NULL)
|
||||
return;
|
||||
UNP_PCB_LOCK(unp2);
|
||||
unp_disconnect(unp, unp2);
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
if (unp2 != NULL) {
|
||||
unp_pcb_hold(unp2);
|
||||
unp_pcb_owned_lock2(unp, unp2, freed);
|
||||
unp_disconnect(unp, unp2);
|
||||
if (unp_pcb_rele(unp2) == 0)
|
||||
UNP_PCB_UNLOCK(unp2);
|
||||
}
|
||||
if (unp_pcb_rele(unp) == 0)
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
}
|
||||
|
||||
static void
|
||||
@ -1881,7 +2056,7 @@ unp_init(void)
|
||||
return;
|
||||
#endif
|
||||
unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
|
||||
NULL, NULL, UMA_ALIGN_PTR, 0);
|
||||
NULL, NULL, UMA_ALIGN_CACHE, 0);
|
||||
if (unp_zone == NULL)
|
||||
panic("unp_init");
|
||||
uma_zone_set_max(unp_zone, maxsockets);
|
||||
@ -2464,13 +2639,15 @@ vfs_unp_reclaim(struct vnode *vp)
|
||||
{
|
||||
struct unpcb *unp;
|
||||
int active;
|
||||
struct mtx *vplock;
|
||||
|
||||
ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
|
||||
KASSERT(vp->v_type == VSOCK,
|
||||
("vfs_unp_reclaim: vp->v_type != VSOCK"));
|
||||
|
||||
active = 0;
|
||||
UNP_LINK_WLOCK();
|
||||
vplock = mtx_pool_find(mtxpool_sleep, vp);
|
||||
mtx_lock(vplock);
|
||||
VOP_UNP_CONNECT(vp, &unp);
|
||||
if (unp == NULL)
|
||||
goto done;
|
||||
@ -2481,8 +2658,8 @@ vfs_unp_reclaim(struct vnode *vp)
|
||||
active = 1;
|
||||
}
|
||||
UNP_PCB_UNLOCK(unp);
|
||||
done:
|
||||
UNP_LINK_WUNLOCK();
|
||||
done:
|
||||
mtx_unlock(vplock);
|
||||
if (active)
|
||||
vunref(vp);
|
||||
}
|
||||
|
||||
@ -69,23 +69,25 @@ typedef uint64_t unp_gen_t;
|
||||
LIST_HEAD(unp_head, unpcb);
|
||||
|
||||
struct unpcb {
|
||||
LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */
|
||||
struct socket *unp_socket; /* pointer back to socket */
|
||||
struct file *unp_file; /* back-pointer to file for gc. */
|
||||
struct vnode *unp_vnode; /* if associated with file */
|
||||
ino_t unp_ino; /* fake inode number */
|
||||
/* Cache line 1 */
|
||||
struct mtx unp_mtx; /* mutex */
|
||||
struct unpcb *unp_conn; /* control block of connected socket */
|
||||
struct unp_head unp_refs; /* referencing socket linked list */
|
||||
LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */
|
||||
struct sockaddr_un *unp_addr; /* bound address of socket */
|
||||
unp_gen_t unp_gencnt; /* generation count of this instance */
|
||||
volatile u_int unp_refcount;
|
||||
short unp_flags; /* flags */
|
||||
short unp_gcflag; /* Garbage collector flags. */
|
||||
struct sockaddr_un *unp_addr; /* bound address of socket */
|
||||
struct socket *unp_socket; /* pointer back to socket */
|
||||
/* Cache line 2 */
|
||||
struct vnode *unp_vnode; /* if associated with file */
|
||||
struct xucred unp_peercred; /* peer credentials, if applicable */
|
||||
u_int unp_refcount;
|
||||
LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */
|
||||
LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */
|
||||
struct unp_head unp_refs; /* referencing socket linked list */
|
||||
unp_gen_t unp_gencnt; /* generation count of this instance */
|
||||
struct file *unp_file; /* back-pointer to file for gc. */
|
||||
u_int unp_msgcount; /* references from message queue */
|
||||
struct mtx unp_mtx; /* mutex */
|
||||
};
|
||||
ino_t unp_ino; /* fake inode number */
|
||||
} __aligned(CACHE_LINE_SIZE);
|
||||
|
||||
/*
|
||||
* Flags in unp_flags.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user