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[master] f289def Make all objects have an objcore, even for the vcl_recv->pass case.

 

 

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phk at varnish-cache

May 14, 2012, 3:06 AM

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[master] f289def Make all objects have an objcore, even for the vcl_recv->pass case.

commit f289def3a62bdc15aa0ef78217254edba689ef2f
Author: Poul-Henning Kamp <phk [at] FreeBSD>
Date: Mon May 14 10:05:53 2012 +0000

Make all objects have an objcore, even for the vcl_recv->pass case.

This simplifies some nasty corner cases.

diff --git a/bin/varnishd/cache/cache_ban.c b/bin/varnishd/cache/cache_ban.c
index c53d945..6986d21 100644
--- a/bin/varnishd/cache/cache_ban.c
+++ b/bin/varnishd/cache/cache_ban.c
@@ -447,6 +447,7 @@ BAN_NewObjCore(struct objcore *oc)

CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
AZ(oc->ban);
+ AN(oc->objhead);
Lck_Lock(&ban_mtx);
oc->ban = ban_start;
ban_start->refcount++;
diff --git a/bin/varnishd/cache/cache_busyobj.c b/bin/varnishd/cache/cache_busyobj.c
index 7fa0291..48efe08 100644
--- a/bin/varnishd/cache/cache_busyobj.c
+++ b/bin/varnishd/cache/cache_busyobj.c
@@ -152,7 +152,7 @@ VBO_DerefBusyObj(struct worker *wrk, struct busyobj **pbo)
*pbo = NULL;
CHECK_OBJ_NOTNULL(bo, BUSYOBJ_MAGIC);
CHECK_OBJ_ORNULL(bo->fetch_obj, OBJECT_MAGIC);
- if (bo->fetch_obj != NULL && bo->fetch_obj->objcore != NULL) {
+ if (bo->fetch_obj != NULL && bo->fetch_obj->objcore->objhead != NULL) {
oc = bo->fetch_obj->objcore;
CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
CHECK_OBJ_NOTNULL(oc->objhead, OBJHEAD_MAGIC);
diff --git a/bin/varnishd/cache/cache_center.c b/bin/varnishd/cache/cache_center.c
index c028cb5..9b7a968 100644
--- a/bin/varnishd/cache/cache_center.c
+++ b/bin/varnishd/cache/cache_center.c
@@ -256,7 +256,7 @@ cnt_prepresp(struct sess *sp, struct worker *wrk, struct req *req)
}

req->t_resp = W_TIM_real(wrk);
- if (req->obj->objcore != NULL) {
+ if (req->obj->objcore->objhead != NULL) {
if ((req->t_resp - req->obj->last_lru) >
cache_param->lru_timeout &&
EXP_Touch(req->obj->objcore))
@@ -340,11 +340,8 @@ cnt_deliver(struct sess *sp, struct worker *wrk, struct req *req)
RES_WriteObj(sp);

/* No point in saving the body if it is hit-for-pass */
- if (req->obj->objcore != NULL) {
- CHECK_OBJ_NOTNULL(req->obj->objcore, OBJCORE_MAGIC);
- if (req->obj->objcore->flags & OC_F_PASS)
- STV_Freestore(req->obj);
- }
+ if (req->obj->objcore->flags & OC_F_PASS)
+ STV_Freestore(req->obj);

assert(WRW_IsReleased(wrk));
(void)HSH_Deref(&wrk->stats, NULL, &req->obj);
@@ -492,6 +489,7 @@ cnt_error(struct sess *sp, struct worker *wrk, struct req *req)
bo->vsl->wid = sp->vsl_id;
AZ(bo->stats);
bo->stats = &wrk->stats;
+ req->objcore = HSH_NewObjCore(wrk);
req->obj = STV_NewObject(bo, &req->objcore,
TRANSIENT_STORAGE, cache_param->http_resp_size,
(uint16_t)cache_param->http_max_hdr);
@@ -586,7 +584,7 @@ cnt_fetch(struct sess *sp, struct worker *wrk, struct req *req)

wrk->acct_tmp.fetch++;

- i = FetchHdr(sp, need_host_hdr, req->objcore == NULL);
+ i = FetchHdr(sp, need_host_hdr, req->objcore->objhead == NULL);
/*
* If we recycle a backend connection, there is a finite chance
* that the backend closed it before we get a request to it.
@@ -594,7 +592,7 @@ cnt_fetch(struct sess *sp, struct worker *wrk, struct req *req)
*/
if (i == 1) {
VSC_C_main->backend_retry++;
- i = FetchHdr(sp, need_host_hdr, req->objcore == NULL);
+ i = FetchHdr(sp, need_host_hdr, req->objcore->objhead == NULL);
}

if (i) {
@@ -626,7 +624,7 @@ cnt_fetch(struct sess *sp, struct worker *wrk, struct req *req)
RFC2616_Ttl(bo, sp->req->xid);

/* pass from vclrecv{} has negative TTL */
- if (req->objcore == NULL)
+ if (req->objcore->objhead == NULL)
bo->exp.ttl = -1.;

AZ(bo->do_esi);
@@ -634,7 +632,7 @@ cnt_fetch(struct sess *sp, struct worker *wrk, struct req *req)

VCL_fetch_method(sp);

- if (req->objcore != NULL && bo->do_pass)
+ if (bo->do_pass)
req->objcore->flags |= OC_F_PASS;

switch (req->handling) {
@@ -652,7 +650,7 @@ cnt_fetch(struct sess *sp, struct worker *wrk, struct req *req)
/* Clean up partial fetch */
AZ(bo->vbc);

- if (req->objcore != NULL) {
+ if (req->objcore->objhead != NULL || req->handling == VCL_RET_ERROR) {
CHECK_OBJ_NOTNULL(req->objcore, OBJCORE_MAGIC);
AZ(HSH_Deref(&wrk->stats, req->objcore, NULL));
req->objcore = NULL;
@@ -707,7 +705,7 @@ cnt_fetchbody(struct sess *sp, struct worker *wrk, struct req *req)

assert(req->handling == VCL_RET_DELIVER);

- if (req->objcore == NULL) {
+ if (req->objcore->objhead == NULL) {
/* This is a pass from vcl_recv */
pass = 1;
/* VCL may have fiddled this, but that doesn't help */
@@ -785,7 +783,7 @@ cnt_fetchbody(struct sess *sp, struct worker *wrk, struct req *req)
pass ? HTTPH_R_PASS : HTTPH_A_INS, &nhttp);

/* Create Vary instructions */
- if (req->objcore != NULL) {
+ if (req->objcore->objhead != NULL) {
CHECK_OBJ_NOTNULL(req->objcore, OBJCORE_MAGIC);
vary = VRY_Create(req, bo->beresp);
if (vary != NULL) {
@@ -884,7 +882,7 @@ cnt_fetchbody(struct sess *sp, struct worker *wrk, struct req *req)

assert(bo->refcount == 2); /* one for each thread */

- if (req->obj->objcore != NULL) {
+ if (req->obj->objcore->objhead != NULL) {
EXP_Insert(req->obj);
AN(req->obj->objcore->ban);
AZ(req->obj->ws_o->overflow);
@@ -895,7 +893,7 @@ cnt_fetchbody(struct sess *sp, struct worker *wrk, struct req *req)
Pool_Task(wrk->pool, &bo->fetch_task, POOL_NO_QUEUE))
FetchBody(wrk, bo);

- if (req->obj->objcore != NULL)
+ if (req->obj->objcore->objhead != NULL)
HSH_Ref(req->obj->objcore);

if (bo->state == BOS_FINISHED) {
@@ -1249,6 +1247,9 @@ cnt_pass(struct sess *sp, struct worker *wrk, struct req *req)
assert(req->handling == VCL_RET_PASS);
wrk->acct_tmp.pass++;
sp->step = STP_FETCH;
+
+ req->objcore = HSH_NewObjCore(wrk);
+ req->objcore->busyobj = bo;
return (0);
}

diff --git a/bin/varnishd/cache/cache_fetch.c b/bin/varnishd/cache/cache_fetch.c
index ee9147d..7e9a25c 100644
--- a/bin/varnishd/cache/cache_fetch.c
+++ b/bin/varnishd/cache/cache_fetch.c
@@ -453,10 +453,8 @@ FetchHdr(struct sess *sp, int need_host_hdr, int sendbody)
AN(req->director);
AZ(req->obj);

- if (req->objcore != NULL) { /* pass has no objcore */
- CHECK_OBJ_NOTNULL(req->objcore, OBJCORE_MAGIC);
- AN(req->objcore->flags & OC_F_BUSY);
- }
+ CHECK_OBJ_NOTNULL(req->objcore, OBJCORE_MAGIC);
+ AN(req->objcore->flags & OC_F_BUSY);

hp = bo->bereq;

@@ -687,7 +685,7 @@ FetchBody(struct worker *wrk, void *priv)
/* XXX: Atomic assignment, needs volatile/membar ? */
bo->state = BOS_FINISHED;
}
- if (obj->objcore != NULL)
+ if (obj->objcore->objhead != NULL)
HSH_Complete(obj->objcore);
bo->stats = NULL;
VBO_DerefBusyObj(wrk, &bo);
diff --git a/bin/varnishd/cache/cache_hash.c b/bin/varnishd/cache/cache_hash.c
index 6b84bab..bc94352 100644
--- a/bin/varnishd/cache/cache_hash.c
+++ b/bin/varnishd/cache/cache_hash.c
@@ -66,23 +66,31 @@
static const struct hash_slinger *hash;

/*---------------------------------------------------------------------*/
+
+struct objcore *
+HSH_NewObjCore(struct worker *wrk)
+{
+ struct objcore *oc;
+
+ ALLOC_OBJ(oc, OBJCORE_MAGIC);
+ XXXAN(oc);
+ wrk->stats.n_objectcore++;
+ oc->flags |= OC_F_BUSY;
+ return (oc);
+}
+
+/*---------------------------------------------------------------------*/
/* Precreate an objhead and object for later use */
static void
hsh_prealloc(struct worker *wrk)
{
struct objhead *oh;
- struct objcore *oc;
struct waitinglist *wl;

CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

- if (wrk->nobjcore == NULL) {
- ALLOC_OBJ(oc, OBJCORE_MAGIC);
- XXXAN(oc);
- wrk->nobjcore = oc;
- wrk->stats.n_objectcore++;
- oc->flags |= OC_F_BUSY;
- }
+ if (wrk->nobjcore == NULL)
+ wrk->nobjcore = HSH_NewObjCore(wrk);
CHECK_OBJ_NOTNULL(wrk->nobjcore, OBJCORE_MAGIC);

if (wrk->nobjhead == NULL) {
@@ -663,40 +671,31 @@ HSH_Deref(struct dstat *ds, struct objcore *oc, struct object **oo)
oc = o->objcore;
}

- if (o != NULL && oc == NULL) {
- /*
- * A pass object with neither objcore nor objhdr reference.
- * -> simply free the (Transient) storage
- */
- STV_Freestore(o);
- STV_free(o->objstore);
- ds->n_object--;
- return (0);
- }
-
CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);

oh = oc->objhead;
- CHECK_OBJ_NOTNULL(oh, OBJHEAD_MAGIC);
+ if (oh != NULL) {
+ CHECK_OBJ_NOTNULL(oh, OBJHEAD_MAGIC);

- Lck_Lock(&oh->mtx);
- assert(oh->refcnt > 0);
- assert(oc->refcnt > 0);
- r = --oc->refcnt;
- if (!r)
- VTAILQ_REMOVE(&oh->objcs, oc, list);
- else {
- /* Must have an object */
- AN(oc->methods);
- }
- if (oh->waitinglist != NULL)
- hsh_rush(ds, oh);
- Lck_Unlock(&oh->mtx);
- if (r != 0)
- return (r);
+ Lck_Lock(&oh->mtx);
+ assert(oh->refcnt > 0);
+ assert(oc->refcnt > 0);
+ r = --oc->refcnt;
+ if (!r)
+ VTAILQ_REMOVE(&oh->objcs, oc, list);
+ else {
+ /* Must have an object */
+ AN(oc->methods);
+ }
+ if (oh->waitinglist != NULL)
+ hsh_rush(ds, oh);
+ Lck_Unlock(&oh->mtx);
+ if (r != 0)
+ return (r);

- BAN_DestroyObj(oc);
- AZ(oc->ban);
+ BAN_DestroyObj(oc);
+ AZ(oc->ban);
+ }

if (oc->methods != NULL) {
oc_freeobj(oc);
@@ -705,11 +704,13 @@ HSH_Deref(struct dstat *ds, struct objcore *oc, struct object **oo)
FREE_OBJ(oc);

ds->n_objectcore--;
- /* Drop our ref on the objhead */
- assert(oh->refcnt > 0);
- if (hash->deref(oh))
- return (0);
- HSH_DeleteObjHead(ds, oh);
+ if (oh != NULL) {
+ /* Drop our ref on the objhead */
+ assert(oh->refcnt > 0);
+ if (hash->deref(oh))
+ return (0);
+ HSH_DeleteObjHead(ds, oh);
+ }
return (0);
}

diff --git a/bin/varnishd/cache/cache_vrt_var.c b/bin/varnishd/cache/cache_vrt_var.c
index 2e56666..37fb7a0 100644
--- a/bin/varnishd/cache/cache_vrt_var.c
+++ b/bin/varnishd/cache/cache_vrt_var.c
@@ -141,7 +141,7 @@ VRT_l_beresp_saintmode(const struct sess *sp, double a)
if (!vbc->backend)
return;
CHECK_OBJ_NOTNULL(vbc->backend, BACKEND_MAGIC);
- if (!sp->req->objcore)
+ if (!sp->req->objcore->objhead)
return;
CHECK_OBJ_NOTNULL(sp->req->objcore, OBJCORE_MAGIC);

diff --git a/bin/varnishd/hash/hash_slinger.h b/bin/varnishd/hash/hash_slinger.h
index 17d67f9..cbf62ba 100644
--- a/bin/varnishd/hash/hash_slinger.h
+++ b/bin/varnishd/hash/hash_slinger.h
@@ -60,6 +60,7 @@ void HSH_AddString(const struct sess *sp, const char *str);
void HSH_Insert(struct worker *, const void *hash, struct objcore *);
void HSH_Purge(const struct sess *, struct objhead *, double ttl, double grace);
void HSH_config(const char *h_arg);
+struct objcore *HSH_NewObjCore(struct worker *wrk);

#ifdef VARNISH_CACHE_CHILD

diff --git a/bin/varnishd/storage/stevedore.c b/bin/varnishd/storage/stevedore.c
index f1cbe94..53846a0 100644
--- a/bin/varnishd/storage/stevedore.c
+++ b/bin/varnishd/storage/stevedore.c
@@ -237,6 +237,7 @@ STV_MkObject(struct stevedore *stv, struct busyobj *bo, struct objcore **ocp,
CHECK_OBJ_NOTNULL(bo, BUSYOBJ_MAGIC);
CHECK_OBJ_NOTNULL(soc, STV_OBJ_SECRETES_MAGIC);
AN(ocp);
+ CHECK_OBJ_NOTNULL((*ocp), OBJCORE_MAGIC);

assert(PAOK(ptr));
assert(PAOK(soc->wsl));
@@ -262,17 +263,14 @@ STV_MkObject(struct stevedore *stv, struct busyobj *bo, struct objcore **ocp,
VTAILQ_INIT(&o->store);
bo->stats->n_object++;

- if (*ocp != NULL) {
- CHECK_OBJ_NOTNULL((*ocp), OBJCORE_MAGIC);
-
- o->objcore = *ocp;
- *ocp = NULL; /* refcnt follows pointer. */
+ o->objcore = *ocp;
+ *ocp = NULL; /* refcnt follows pointer. */
+ if (o->objcore->objhead != NULL)
BAN_NewObjCore(o->objcore);

- o->objcore->methods = &default_oc_methods;
- o->objcore->priv = o;
- o->objcore->priv2 = (uintptr_t)stv;
- }
+ o->objcore->methods = &default_oc_methods;
+ o->objcore->priv = o;
+ o->objcore->priv2 = (uintptr_t)stv;
return (o);
}

@@ -356,8 +354,11 @@ STV_NewObject(struct busyobj *bo, struct objcore **ocp, const char *hint,
}
}

- if (o == NULL)
+ if (o == NULL) {
+ AN(*ocp);
return (NULL);
+ }
+ AZ(*ocp);
CHECK_OBJ_NOTNULL(o, OBJECT_MAGIC);
CHECK_OBJ_NOTNULL(o->objstore, STORAGE_MAGIC);
return (o);

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