GCOV - Varnish Cache


/*-
 * Copyright (c) 2013-2016 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Lifetime of an objcore:
 *      phase 0 - nonexistent
 *      phase 1 - created, but no stevedore associated
 *      phase 2 - stevedore associated, being filled out
 *      phase 3 - stable, no changes happening
 *      phase 4 - unavailable, being dismantled
 *      phase 5 - stevedore disassociated
 *      phase 6 - nonexistent
 *
 * 0->1 ObjNew()        creates objcore
 *
 * 1->2 STV_NewObject() associates a stevedore
 *
 * 2    ObjSetState()   sets state
 * 2    ObjWaitState()  waits for particular state
 *                      INVALID->REQ_DONE->STREAM->FINISHED->FAILED
 *
 * 2    ObjGetSpace()   allocates space
 * 2    ObjExtend()     commits content
 * 2    ObjWaitExtend() waits for content - used to implement ObjIterate())
 *
 * 2    ObjSetAttr()
 * 2      ObjCopyAttr()
 * 2      ObjSetFlag()
 * 2      ObjSetDouble()
 * 2      ObjSetU32()
 * 2      ObjSetU64()
 *
 * 2->3 ObjBocDone()    Boc removed from OC, clean it up
 *
 * 23   ObjHasAttr()
 * 23   ObjGetAttr()
 * 23     ObjCheckFlag()
 * 23     ObjGetDouble()
 * 23     ObjGetU32()
 * 23     ObjGetU64()
 * 23     ObjGetLen()
 * 23     ObjGetXID()
 *
 * 23   ObjIterate()    ... over body
 *
 * 23   ObjTouch()      Signal to LRU(-like) facilities
 *
 * 3->4 HSH_Snipe()     kill if not in use
 * 3->4 HSH_Kill()      make unavailable
 *
 * 234  ObjSlim()       Release body storage (but retain attribute storage)
 *
 * 4->5 ObjFreeObj()    disassociates stevedore
 *
 * 5->6 FREE_OBJ()      ...in HSH_DerefObjCore()
 */

#include "config.h"

#include <stdlib.h>

#include "cache_varnishd.h"
#include "cache_obj.h"
#include "cache_objhead.h"
#include "vend.h"
#include "storage/storage.h"

static const struct obj_methods *
obj_getmethods(const struct objcore *oc)
{

        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        CHECK_OBJ_NOTNULL(oc->stobj->stevedore, STEVEDORE_MAGIC);
        AN(oc->stobj->stevedore->methods);
        return (oc->stobj->stevedore->methods);
}

static struct boc *
obj_newboc(void)
{
        struct boc *boc;

        ALLOC_OBJ(boc, BOC_MAGIC);
        AN(boc);
        Lck_New(&boc->mtx, lck_busyobj);
        PTOK(pthread_cond_init(&boc->cond, NULL));
        boc->refcount = 1;
        return (boc);
}

static void
obj_deleteboc(struct boc **p)
{
        struct boc *boc;

        TAKE_OBJ_NOTNULL(boc, p, BOC_MAGIC);
        Lck_Delete(&boc->mtx);
        PTOK(pthread_cond_destroy(&boc->cond));
        free(boc->vary);
        FREE_OBJ(boc);
}

/*====================================================================
 * ObjNew()
 *
 */

struct objcore *
ObjNew(const struct worker *wrk)
{
        struct objcore *oc;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        ALLOC_OBJ(oc, OBJCORE_MAGIC);
        AN(oc);
        wrk->stats->n_objectcore++;
        oc->last_lru = NAN;
        oc->boc = obj_newboc();

        return (oc);
}

/*====================================================================
 * ObjDestroy()
 *
 */

void
ObjDestroy(const struct worker *wrk, struct objcore **p)
{
        struct objcore *oc;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        TAKE_OBJ_NOTNULL(oc, p, OBJCORE_MAGIC);
        if (oc->boc != NULL)
                obj_deleteboc(&oc->boc);
        FREE_OBJ(oc);
        wrk->stats->n_objectcore--;
}

/*====================================================================
 * ObjIterate()
 *
 */

int
ObjIterate(struct worker *wrk, struct objcore *oc,
    void *priv, objiterate_f *func, int final)
{
        const struct obj_methods *om = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        AN(func);
        AN(om->objiterator);
        return (om->objiterator(wrk, oc, priv, func, final));
}

/*====================================================================
 * ObjVAI...(): Asynchronous Iteration
 *
 *
 * ObjVAIinit() returns an opaque handle, or NULL if not supported
 *
 *      A VAI handle must not be used concurrently
 *
 *      the vai_notify_cb(priv) will be called asynchronously by the storage
 *      engine when a -EAGAIN / -ENOBUFS condition is over and ObjVAIlease()
 *      can be called again.
 *
 *      Note:
 *      - the callback gets executed by an arbitrary thread
 *      - WITH the boc mtx held
 *      so it should never block and only do minimal work
 *
 * ObjVAIlease() fills the vscarab with leases. returns:
 *
 *      -EAGAIN:  nothing available at the moment, storage will notify, no use to
 *                call again until notification
 *      -ENOBUFS: caller needs to return leases, storage will notify
 *      -EPIPE:   BOS_FAILED for busy object
 *      -(errno): other problem, fatal
 *
 *      >= 0:     number of viovs added (== scarab->capacity - scarab->used)
 *
 *      struct vscarab:
 *
 *      the leases can be used by the caller until returned with
 *      ObjVAIreturn(). The storage guarantees that the lease member is a
 *      multiple of 8 (that is, the lower three bits are zero). These can be
 *      used by the caller between lease and return, but must be cleared to
 *      zero before returning.
 *
 * ObjVAIbuffer() allocates temporary buffers, returns:
 *
 *      -EAGAIN:  allocation can not be fulfilled immediately, storage will notify,
 *                no use to call again until notification
 *      -EINVAL:  size larger than UINT_MAX requested
 *      -(errno): other problem, fatal
 *      n:        n > 0, number of viovs filled
 *
 *      The struct vscarab is used on the way in and out: On the way in, the
 *      iov.iov_len members contain the sizes the caller requests, all other
 *      members of the struct viovs are expected to be zero initialized.
 *
 *      The maximum size to be requested is UINT_MAX.
 *
 *      ObjVAIbuffer() may return sizes larger than requested. The returned n
 *      might be smaller than requested.
 *
 * ObjVAIreturn() returns leases collected in a struct vscaret
 *
 *      it must be called with a vscaret, which holds an array of lease values
 *      received via ObjVAIlease() or ObjVAIbuffer() when the caller can
 *      guarantee that they are no longer accessed.
 *
 *      ObjVAIreturn() may retain leases in the vscaret if the implementation
 *      still requires them, iow, the vscaret might not be empty upon return.
 *
 * ObjVAIfini() finalized iteration
 *
 *      it must be called when iteration is done, irrespective of error status
 */

vai_hdl
ObjVAIinit(struct worker *wrk, struct objcore *oc, struct ws *ws,
    vai_notify_cb *cb, void *cb_priv)
{
        const struct obj_methods *om = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        if (om->vai_init == NULL)
                return (NULL);
        return (om->vai_init(wrk, oc, ws, cb, cb_priv));
}

int
ObjVAIlease(struct worker *wrk, vai_hdl vhdl, struct vscarab *scarab)
{
        struct vai_hdl_preamble *vaip = vhdl;

        AN(vaip);
        assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
        AN(vaip->vai_lease);
        return (vaip->vai_lease(wrk, vhdl, scarab));
}

int
ObjVAIbuffer(struct worker *wrk, vai_hdl vhdl, struct vscarab *scarab)
{
        struct vai_hdl_preamble *vaip = vhdl;

        AN(vaip);
        assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
        AN(vaip->vai_buffer);
        return (vaip->vai_buffer(wrk, vhdl, scarab));
}

void
ObjVAIreturn(struct worker *wrk, vai_hdl vhdl, struct vscaret *scaret)
{
        struct vai_hdl_preamble *vaip = vhdl;

        AN(vaip);
        assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
        AN(vaip->vai_return);
        vaip->vai_return(wrk, vhdl, scaret);
}

void
ObjVAIfini(struct worker *wrk, vai_hdl *vhdlp)
{
        AN(vhdlp);
        struct vai_hdl_preamble *vaip = *vhdlp;

        AN(vaip);
        assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
        AN(vaip->vai_lease);
        vaip->vai_fini(wrk, vhdlp);
}

/*====================================================================
 * ObjGetSpace()
 *
 * This function returns a pointer and length of free space.  If there
 * is no free space, some will be added first.
 *
 * The "sz" argument is an input hint of how much space is desired.
 * 0 means "unknown", return some default size (maybe fetch_chunksize)
 */

int
ObjGetSpace(struct worker *wrk, struct objcore *oc, ssize_t *sz, uint8_t **ptr)
{
        const struct obj_methods *om = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
        AN(sz);
        AN(ptr);
        assert(*sz >= 0);

        AN(om->objgetspace);
        return (om->objgetspace(wrk, oc, sz, ptr));
}

/*====================================================================
 * ObjExtend()
 *
 * This function extends the used part of the object a number of bytes
 * into the last space returned by ObjGetSpace()
 *
 * The final flag must be set on the last call, and it will release any
 * surplus space allocated.
 */

static void
obj_extend_condwait(const struct objcore *oc)
{

        if (oc->boc->transit_buffer == 0)
                return;

        assert(oc->flags & OC_F_TRANSIENT);
        while (!(oc->flags & OC_F_CANCEL) && oc->boc->fetched_so_far >
            oc->boc->delivered_so_far + oc->boc->transit_buffer)
                (void)Lck_CondWait(&oc->boc->cond, &oc->boc->mtx);
}

// notify of an extension of the boc or state change

static void
obj_boc_notify(struct boc *boc)
{
        struct vai_qe *qe, *next;

        PTOK(pthread_cond_broadcast(&boc->cond));
        qe = VSLIST_FIRST(&boc->vai_q_head);
        VSLIST_FIRST(&boc->vai_q_head) = NULL;
        while (qe != NULL) {
                CHECK_OBJ(qe, VAI_Q_MAGIC);
                AN(qe->flags & VAI_QF_INQUEUE);
                qe->flags &= ~VAI_QF_INQUEUE;
                next = VSLIST_NEXT(qe, list);
                VSLIST_NEXT(qe, list) = NULL;
                qe->cb(qe->hdl, qe->priv);
                qe = next;
        }
}

void
ObjExtend(struct worker *wrk, struct objcore *oc, ssize_t l, int final)
{
        const struct obj_methods *om = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
        AN(om->objextend);
        assert(l >= 0);

        if (l > 0) {
                Lck_Lock(&oc->boc->mtx);
                obj_extend_condwait(oc);
                om->objextend(wrk, oc, l);
                oc->boc->fetched_so_far += l;
                obj_boc_notify(oc->boc);
                Lck_Unlock(&oc->boc->mtx);

                if (oc->boc->transit_buffer > 0)
                        wrk->stats->transit_buffered += l;
                else if (oc->flags & OC_F_TRANSIENT)
                        wrk->stats->transit_stored += l;
        }

        assert(oc->boc->state < BOS_FINISHED);
        if (final && om->objtrimstore != NULL)
                om->objtrimstore(wrk, oc);
}

/*====================================================================
 */

static inline void
objSignalFetchLocked(const struct objcore *oc, uint64_t l)
{
        if (oc->boc->transit_buffer > 0) {
                assert(oc->flags & OC_F_TRANSIENT);
                /* Signal the new client position */
                oc->boc->delivered_so_far = l;
                PTOK(pthread_cond_signal(&oc->boc->cond));
        }
}

uint64_t
ObjWaitExtend(const struct worker *wrk, const struct objcore *oc, uint64_t l,
    enum boc_state_e *statep)
{
        enum boc_state_e state;
        uint64_t rv;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
        Lck_Lock(&oc->boc->mtx);
        while (1) {
                rv = oc->boc->fetched_so_far;
                assert(l <= rv || oc->boc->state == BOS_FAILED);
                state = oc->boc->state;
                objSignalFetchLocked(oc, l);
                if (rv > l || state >= BOS_FINISHED)
                        break;
                (void)Lck_CondWait(&oc->boc->cond, &oc->boc->mtx);
        }
        Lck_Unlock(&oc->boc->mtx);
        if (statep != NULL)
                *statep = state;
        return (rv);
}

// get a new extension _or_ register a notification
uint64_t
ObjVAIGetExtend(struct worker *wrk, const struct objcore *oc, uint64_t l,
    enum boc_state_e *statep, struct vai_qe *qe)
{
        enum boc_state_e state;
        uint64_t rv;

        (void) wrk;
        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
        CHECK_OBJ_NOTNULL(qe, VAI_Q_MAGIC);
        Lck_Lock(&oc->boc->mtx);
        rv = oc->boc->fetched_so_far;
        assert(l <= rv || oc->boc->state == BOS_FAILED);
        state = oc->boc->state;
        objSignalFetchLocked(oc, l);
        if (l == rv && state < BOS_FINISHED &&
            (qe->flags & VAI_QF_INQUEUE) == 0) {
                qe->flags |= VAI_QF_INQUEUE;
                VSLIST_INSERT_HEAD(&oc->boc->vai_q_head, qe, list);
        }
        Lck_Unlock(&oc->boc->mtx);
        if (statep != NULL)
                *statep = state;
        return (rv);
}

void
ObjVAICancel(struct worker *wrk, struct boc *boc, struct vai_qe *qe)
{

        (void) wrk;
        CHECK_OBJ_NOTNULL(boc, BOC_MAGIC);
        CHECK_OBJ_NOTNULL(qe, VAI_Q_MAGIC);

        Lck_Lock(&boc->mtx);
        // inefficient, but should be rare
        if ((qe->flags & VAI_QF_INQUEUE) != 0)
                VSLIST_REMOVE(&boc->vai_q_head, qe, vai_qe, list);
        qe->flags = 0;
        Lck_Unlock(&boc->mtx);
}

/*====================================================================
 */

void
ObjSetState(struct worker *wrk, struct objcore *oc, enum boc_state_e next,
    unsigned broadcast)
{
        const struct obj_methods *om;

        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
        assert(next > oc->boc->state);

        CHECK_OBJ_ORNULL(oc->stobj->stevedore, STEVEDORE_MAGIC);
        assert(next != BOS_FINISHED || (oc->oa_present & (1 << OA_LEN)));

        if (oc->stobj->stevedore != NULL) {
                om = oc->stobj->stevedore->methods;
                if (om->objsetstate != NULL)
                        om->objsetstate(wrk, oc, next);
        }

        if (next == BOS_FAILED)
                HSH_Fail(wrk, oc);
        else if (oc->boc->state < BOS_STREAM && next >= BOS_STREAM)
                HSH_Unbusy(wrk, oc);

        Lck_Lock(&oc->boc->mtx);
        oc->boc->state = next;
        if (broadcast)
                obj_boc_notify(oc->boc);
        Lck_Unlock(&oc->boc->mtx);
}

/*====================================================================
 */

enum boc_state_e
ObjWaitState(const struct objcore *oc, enum boc_state_e want)
{
        enum boc_state_e got;

        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);

        Lck_Lock(&oc->boc->mtx);
        /* wake up obj_extend_condwait() */
        if (oc->flags & OC_F_CANCEL)
                PTOK(pthread_cond_signal(&oc->boc->cond));
        while (1) {
                if (oc->boc->state >= want)
                        break;
                (void)Lck_CondWait(&oc->boc->cond, &oc->boc->mtx);
        }
        got = oc->boc->state;
        Lck_Unlock(&oc->boc->mtx);

        return (got);
}

/*====================================================================
 * ObjGetlen()
 *
 * This is a separate function because it may need locking
 */

uint64_t
ObjGetLen(struct worker *wrk, struct objcore *oc)
{
        uint64_t len;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        AZ(ObjGetU64(wrk, oc, OA_LEN, &len));
        return (len);
}

/*====================================================================
 * ObjSlim()
 *
 * Free the whatever storage can be freed, without freeing the actual
 * object yet.
 */

void
ObjSlim(struct worker *wrk, struct objcore *oc)
{
        const struct obj_methods *om = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        if (om->objslim != NULL)
                om->objslim(wrk, oc);
}

/*====================================================================
 * Called when the boc used to populate the objcore is going away.
 * Useful for releasing any leftovers from Trim.
 */

void
ObjBocDone(struct worker *wrk, struct objcore *oc, struct boc **boc)
{
        const struct obj_methods *m;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        AN(boc);
        CHECK_OBJ_NOTNULL(*boc, BOC_MAGIC);
        CHECK_OBJ_ORNULL(oc->stobj->stevedore, STEVEDORE_MAGIC);
        if (oc->stobj->stevedore != NULL) {
                m = obj_getmethods(oc);
                if (m->objbocdone != NULL)
                        m->objbocdone(wrk, oc, *boc);
        }
        obj_deleteboc(boc);
}

/*====================================================================
 */
void
ObjFreeObj(struct worker *wrk, struct objcore *oc)
{
        const struct obj_methods *m = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        AN(m->objfree);
        m->objfree(wrk, oc);
        AZ(oc->stobj->stevedore);
}

/*====================================================================
 * ObjHasAttr()
 *
 * Check if object has this attribute
 */

int
ObjHasAttr(struct worker *wrk, struct objcore *oc, enum obj_attr attr)
{

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);

        if (oc->oa_present)
                return (oc->oa_present & (1 << attr));

        /* resurrected persistent objects don't have oa_present set */
        return (ObjGetAttr(wrk, oc, attr, NULL) != NULL ? 1 : 0);
}

/*====================================================================
 * ObjGetAttr()
 *
 * Get an attribute of the object.
 *
 * Returns NULL on unset or zero length attributes and len set to
 * zero. Returns Non-NULL otherwise and len is updated with the attributes
 * length.
 */

const void *
ObjGetAttr(struct worker *wrk, struct objcore *oc, enum obj_attr attr,
   ssize_t *len)
{
        const struct obj_methods *om = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);

        AN(om->objgetattr);
        return (om->objgetattr(wrk, oc, attr, len));
}

/*====================================================================
 * ObjSetAttr()
 *
 * Setting fixed size attributes always succeeds.
 *
 * Setting a variable size attribute asserts if the combined size of the
 * variable attributes exceeds the total variable attribute space set at
 * object creation. If there is space it always succeeds.
 *
 * Setting an auxiliary attribute can fail.
 *
 * Resetting any variable asserts if the new length does not match the
 * previous length exactly.
 *
 * If ptr is Non-NULL, it points to the new content which is copied into
 * the attribute.  Otherwise the caller will have to do the copying.
 *
 * Return value is non-NULL on success and NULL on failure. If ptr was
 * non-NULL, it is an error to use the returned pointer to set the
 * attribute data, it is only a success indicator in that case.
 */

void *
ObjSetAttr(struct worker *wrk, struct objcore *oc, enum obj_attr attr,
    ssize_t len, const void *ptr)
{
        const struct obj_methods *om = obj_getmethods(oc);
        void *r;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);

        AN(om->objsetattr);
        assert((int)attr < 16);
        r = om->objsetattr(wrk, oc, attr, len, ptr);
        if (r)
                oc->oa_present |= (1 << attr);
        return (r);
}

/*====================================================================
 * ObjTouch()
 */

void
ObjTouch(struct worker *wrk, struct objcore *oc, vtim_real now)
{
        const struct obj_methods *om = obj_getmethods(oc);

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        if (om->objtouch != NULL)
                om->objtouch(wrk, oc, now);
}

/*====================================================================
 * Utility functions which work on top of the previous ones
 */

int
ObjCopyAttr(struct worker *wrk, struct objcore *oc, struct objcore *ocs,
    enum obj_attr attr)
{
        const void *vps;
        void *vpd;
        ssize_t l;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
        CHECK_OBJ_NOTNULL(ocs, OBJCORE_MAGIC);

        vps = ObjGetAttr(wrk, ocs, attr, &l);
        // XXX: later we want to have zero-length OA's too
        if (vps == NULL || l <= 0)
                return (-1);
        vpd = ObjSetAttr(wrk, oc, attr, l, vps);
        if (vpd == NULL)
                return (-1);
        return (0);
}

int
ObjSetXID(struct worker *wrk, struct objcore *oc, vxid_t xid)
{
        uint64_t u;

        u = VXID(xid);
        AZ(ObjSetU64(wrk, oc, OA_VXID, u));
        return (0);
}


vxid_t
ObjGetXID(struct worker *wrk, struct objcore *oc)
{
        vxid_t u;

        AZ(ObjGetU64(wrk, oc, OA_VXID, &u.vxid));
        return (u);
}

/*--------------------------------------------------------------------
 * There is no well-defined byteorder for IEEE-754 double and the
 * correct solution (frexp(3) and manual encoding) is more work
 * than our (weak) goal of being endian-agnostic requires at this point.
 * We give it a shot by memcpy'ing doubles over a uint64_t and then
 * BE encode that.
 */

int
ObjSetDouble(struct worker *wrk, struct objcore *oc, enum obj_attr a, double t)
{
        void *vp;
        uint64_t u;

        assert(sizeof t == sizeof u);
        memcpy(&u, &t, sizeof u);
        vp = ObjSetAttr(wrk, oc, a, sizeof u, NULL);
        if (vp == NULL)
                return (-1);
        vbe64enc(vp, u);
        return (0);
}

int
ObjGetDouble(struct worker *wrk, struct objcore *oc, enum obj_attr a, double *d)
{
        const void *vp;
        uint64_t u;
        ssize_t l;

        assert(sizeof *d == sizeof u);
        vp = ObjGetAttr(wrk, oc, a, &l);
        if (vp == NULL)
                return (-1);
        if (d != NULL) {
                assert(l == sizeof u);
                u = vbe64dec(vp);
                memcpy(d, &u, sizeof *d);
        }
        return (0);
}

/*--------------------------------------------------------------------
 */

int
ObjSetU64(struct worker *wrk, struct objcore *oc, enum obj_attr a, uint64_t t)
{
        void *vp;

        vp = ObjSetAttr(wrk, oc, a, sizeof t, NULL);
        if (vp == NULL)
                return (-1);
        vbe64enc(vp, t);
        return (0);
}

int
ObjGetU64(struct worker *wrk, struct objcore *oc, enum obj_attr a, uint64_t *d)
{
        const void *vp;
        ssize_t l;

        vp = ObjGetAttr(wrk, oc, a, &l);
        if (vp == NULL || l != sizeof *d)
                return (-1);
        if (d != NULL)
                *d = vbe64dec(vp);
        return (0);
}

/*--------------------------------------------------------------------
 */

int
ObjCheckFlag(struct worker *wrk, struct objcore *oc, enum obj_flags of)
{
        const uint8_t *fp;

        fp = ObjGetAttr(wrk, oc, OA_FLAGS, NULL);
        AN(fp);
        return ((*fp) & of);
}

void
ObjSetFlag(struct worker *wrk, struct objcore *oc, enum obj_flags of, int val)
{
        uint8_t *fp;

        fp = ObjSetAttr(wrk, oc, OA_FLAGS, 1, NULL);
        AN(fp);
        if (val)
                (*fp) |= of;
        else
                (*fp) &= ~of;
}

/*====================================================================
 * Object event subscription mechanism.
 *
 * XXX: it is extremely unclear what the locking circumstances are here.
 */

struct oev_entry {
        unsigned                        magic;
#define OEV_MAGIC                       0xb0b7c5a1
        unsigned                        mask;
        obj_event_f                     *func;
        void                            *priv;
        VTAILQ_ENTRY(oev_entry)         list;
};

static VTAILQ_HEAD(,oev_entry)          oev_list;
static pthread_rwlock_t                 oev_rwl;
static unsigned                         oev_mask;

/*
 * NB: ObjSubscribeEvents() is not atomic:
 * oev_mask is checked optimistically in ObjSendEvent()
 */
uintptr_t
ObjSubscribeEvents(obj_event_f *func, void *priv, unsigned mask)
{
        struct oev_entry *oev;

        AN(func);
        AZ(mask & ~OEV_MASK);

        ALLOC_OBJ(oev, OEV_MAGIC);
        AN(oev);
        oev->func = func;
        oev->priv = priv;
        oev->mask = mask;
        PTOK(pthread_rwlock_wrlock(&oev_rwl));
        VTAILQ_INSERT_TAIL(&oev_list, oev, list);
        oev_mask |= mask;
        PTOK(pthread_rwlock_unlock(&oev_rwl));
        return ((uintptr_t)oev);
}

void
ObjUnsubscribeEvents(uintptr_t *handle)
{
        struct oev_entry *oev, *oev2 = NULL;
        unsigned newmask = 0;

        AN(handle);
        AN(*handle);
        PTOK(pthread_rwlock_wrlock(&oev_rwl));
        VTAILQ_FOREACH(oev, &oev_list, list) {
                CHECK_OBJ_NOTNULL(oev, OEV_MAGIC);
                if ((uintptr_t)oev == *handle)
                        oev2 = oev;
                else
                        newmask |= oev->mask;
        }
        AN(oev2);
        VTAILQ_REMOVE(&oev_list, oev2, list);
        oev_mask = newmask;
        AZ(newmask & ~OEV_MASK);
        PTOK(pthread_rwlock_unlock(&oev_rwl));
        FREE_OBJ(oev2);
        *handle = 0;
}

void
ObjSendEvent(struct worker *wrk, struct objcore *oc, unsigned event)
{
        struct oev_entry *oev;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
        AN(event & OEV_MASK);
        AZ(event & ~OEV_MASK);
        if (!(event & oev_mask))
                return;

        PTOK(pthread_rwlock_rdlock(&oev_rwl));
        VTAILQ_FOREACH(oev, &oev_list, list) {
                CHECK_OBJ_NOTNULL(oev, OEV_MAGIC);
                if (event & oev->mask)
                        oev->func(wrk, oev->priv, oc, event);
        }
        PTOK(pthread_rwlock_unlock(&oev_rwl));

}

void
ObjInit(void)
{
        VTAILQ_INIT(&oev_list);
        PTOK(pthread_rwlock_init(&oev_rwl, NULL));
}

		varnish-cache/bin/varnishd/cache/cache_obj.c
0		/*-
1		* Copyright (c) 2013-2016 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
5		*
6		* SPDX-License-Identifier: BSD-2-Clause
7		*
8		* Redistribution and use in source and binary forms, with or without
9		* modification, are permitted provided that the following conditions
10		* are met:
11		* 1. Redistributions of source code must retain the above copyright
12		* notice, this list of conditions and the following disclaimer.
13		* 2. Redistributions in binary form must reproduce the above copyright
14		* notice, this list of conditions and the following disclaimer in the
15		* documentation and/or other materials provided with the distribution.
16		*
17		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27		* SUCH DAMAGE.
28		*
29		* Lifetime of an objcore:
30		* phase 0 - nonexistent
31		* phase 1 - created, but no stevedore associated
32		* phase 2 - stevedore associated, being filled out
33		* phase 3 - stable, no changes happening
34		* phase 4 - unavailable, being dismantled
35		* phase 5 - stevedore disassociated
36		* phase 6 - nonexistent
37		*
38		* 0->1 ObjNew() creates objcore
39		*
40		* 1->2 STV_NewObject() associates a stevedore
41		*
42		* 2 ObjSetState() sets state
43		* 2 ObjWaitState() waits for particular state
44		* INVALID->REQ_DONE->STREAM->FINISHED->FAILED
45		*
46		* 2 ObjGetSpace() allocates space
47		* 2 ObjExtend() commits content
48		* 2 ObjWaitExtend() waits for content - used to implement ObjIterate())
49		*
50		* 2 ObjSetAttr()
51		* 2 ObjCopyAttr()
52		* 2 ObjSetFlag()
53		* 2 ObjSetDouble()
54		* 2 ObjSetU32()
55		* 2 ObjSetU64()
56		*
57		* 2->3 ObjBocDone() Boc removed from OC, clean it up
58		*
59		* 23 ObjHasAttr()
60		* 23 ObjGetAttr()
61		* 23 ObjCheckFlag()
62		* 23 ObjGetDouble()
63		* 23 ObjGetU32()
64		* 23 ObjGetU64()
65		* 23 ObjGetLen()
66		* 23 ObjGetXID()
67		*
68		* 23 ObjIterate() ... over body
69		*
70		* 23 ObjTouch() Signal to LRU(-like) facilities
71		*
72		* 3->4 HSH_Snipe() kill if not in use
73		* 3->4 HSH_Kill() make unavailable
74		*
75		* 234 ObjSlim() Release body storage (but retain attribute storage)
76		*
77		* 4->5 ObjFreeObj() disassociates stevedore
78		*
79		* 5->6 FREE_OBJ() ...in HSH_DerefObjCore()
80		*/
81
82		#include "config.h"
83
84		#include <stdlib.h>
85
86		#include "cache_varnishd.h"
87		#include "cache_obj.h"
88		#include "cache_objhead.h"
89		#include "vend.h"
90		#include "storage/storage.h"
91
92		static const struct obj_methods *
93	1306328	obj_getmethods(const struct objcore *oc)
94		{
95
96	1306328	CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
97	1306328	CHECK_OBJ_NOTNULL(oc->stobj->stevedore, STEVEDORE_MAGIC);
98	1306328	AN(oc->stobj->stevedore->methods);
99	1306328	return (oc->stobj->stevedore->methods);
100		}
101
102		static struct boc *
103	26182	obj_newboc(void)
104		{
105		struct boc *boc;
106
107	26182	ALLOC_OBJ(boc, BOC_MAGIC);
108	26182	AN(boc);
109	26182	Lck_New(&boc->mtx, lck_busyobj);
110	26182	PTOK(pthread_cond_init(&boc->cond, NULL));
111	26182	boc->refcount = 1;
112	26182	return (boc);
113		}
114
115		static void
116	23870	obj_deleteboc(struct boc **p)
117		{
118		struct boc *boc;
119
120	23870	TAKE_OBJ_NOTNULL(boc, p, BOC_MAGIC);
121	23870	Lck_Delete(&boc->mtx);
122	23870	PTOK(pthread_cond_destroy(&boc->cond));
123	23870	free(boc->vary);
124	23870	FREE_OBJ(boc);
125	23870	}
126
127		/*====================================================================
128		* ObjNew()
129		*
130		*/
131
132		struct objcore *
133	26182	ObjNew(const struct worker *wrk)
134		{
135		struct objcore *oc;
136
137	26182	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
138
139	26182	ALLOC_OBJ(oc, OBJCORE_MAGIC);
140	26182	AN(oc);
141	26182	wrk->stats->n_objectcore++;
142	26182	oc->last_lru = NAN;
143	26182	oc->boc = obj_newboc();
144
145	26182	return (oc);
146		}
147
148		/*====================================================================
149		* ObjDestroy()
150		*
151		*/
152
153		void
154	15204	ObjDestroy(const struct worker wrk, struct objcore *p)
155		{
156		struct objcore *oc;
157
158	15204	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
159	15204	TAKE_OBJ_NOTNULL(oc, p, OBJCORE_MAGIC);
160	15204	if (oc->boc != NULL)
161	302	obj_deleteboc(&oc->boc);
162	15204	FREE_OBJ(oc);
163	15204	wrk->stats->n_objectcore--;
164	15204	}
165
166		/*====================================================================
167		* ObjIterate()
168		*
169		*/
170
171		int
172	19726	ObjIterate(struct worker wrk, struct objcore oc,
173		void priv, objiterate_f func, int final)
174		{
175	19726	const struct obj_methods *om = obj_getmethods(oc);
176
177	19726	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
178	19726	AN(func);
179	19726	AN(om->objiterator);
180	19726	return (om->objiterator(wrk, oc, priv, func, final));
181		}
182
183		/*====================================================================
184		* ObjVAI...(): Asynchronous Iteration
185		*
186		*
187		* ObjVAIinit() returns an opaque handle, or NULL if not supported
188		*
189		* A VAI handle must not be used concurrently
190		*
191		* the vai_notify_cb(priv) will be called asynchronously by the storage
192		* engine when a -EAGAIN / -ENOBUFS condition is over and ObjVAIlease()
193		* can be called again.
194		*
195		* Note:
196		* - the callback gets executed by an arbitrary thread
197		* - WITH the boc mtx held
198		* so it should never block and only do minimal work
199		*
200		* ObjVAIlease() fills the vscarab with leases. returns:
201		*
202		* -EAGAIN: nothing available at the moment, storage will notify, no use to
203		* call again until notification
204		* -ENOBUFS: caller needs to return leases, storage will notify
205		* -EPIPE: BOS_FAILED for busy object
206		* -(errno): other problem, fatal
207		*
208		* >= 0: number of viovs added (== scarab->capacity - scarab->used)
209		*
210		* struct vscarab:
211		*
212		* the leases can be used by the caller until returned with
213		* ObjVAIreturn(). The storage guarantees that the lease member is a
214		* multiple of 8 (that is, the lower three bits are zero). These can be
215		* used by the caller between lease and return, but must be cleared to
216		* zero before returning.
217		*
218		* ObjVAIbuffer() allocates temporary buffers, returns:
219		*
220		* -EAGAIN: allocation can not be fulfilled immediately, storage will notify,
221		* no use to call again until notification
222		* -EINVAL: size larger than UINT_MAX requested
223		* -(errno): other problem, fatal
224		* n: n > 0, number of viovs filled
225		*
226		* The struct vscarab is used on the way in and out: On the way in, the
227		* iov.iov_len members contain the sizes the caller requests, all other
228		* members of the struct viovs are expected to be zero initialized.
229		*
230		* The maximum size to be requested is UINT_MAX.
231		*
232		* ObjVAIbuffer() may return sizes larger than requested. The returned n
233		* might be smaller than requested.
234		*
235		* ObjVAIreturn() returns leases collected in a struct vscaret
236		*
237		* it must be called with a vscaret, which holds an array of lease values
238		* received via ObjVAIlease() or ObjVAIbuffer() when the caller can
239		* guarantee that they are no longer accessed.
240		*
241		* ObjVAIreturn() may retain leases in the vscaret if the implementation
242		* still requires them, iow, the vscaret might not be empty upon return.
243		*
244		* ObjVAIfini() finalized iteration
245		*
246		* it must be called when iteration is done, irrespective of error status
247		*/
248
249		vai_hdl
250	19983	ObjVAIinit(struct worker wrk, struct objcore oc, struct ws *ws,
251		vai_notify_cb cb, void cb_priv)
252		{
253	19983	const struct obj_methods *om = obj_getmethods(oc);
254
255	19983	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
256
257	19983	if (om->vai_init == NULL)
258	0	return (NULL);
259	19983	return (om->vai_init(wrk, oc, ws, cb, cb_priv));
260	19983	}
261
262		int
263	54353	ObjVAIlease(struct worker wrk, vai_hdl vhdl, struct vscarab scarab)
264		{
265	54353	struct vai_hdl_preamble *vaip = vhdl;
266
267	54353	AN(vaip);
268	54353	assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
269	54353	AN(vaip->vai_lease);
270	54353	return (vaip->vai_lease(wrk, vhdl, scarab));
271		}
272
273		int
274	128	ObjVAIbuffer(struct worker wrk, vai_hdl vhdl, struct vscarab scarab)
275		{
276	128	struct vai_hdl_preamble *vaip = vhdl;
277
278	128	AN(vaip);
279	128	assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
280	128	AN(vaip->vai_buffer);
281	128	return (vaip->vai_buffer(wrk, vhdl, scarab));
282		}
283
284		void
285	24249	ObjVAIreturn(struct worker wrk, vai_hdl vhdl, struct vscaret scaret)
286		{
287	24249	struct vai_hdl_preamble *vaip = vhdl;
288
289	24249	AN(vaip);
290	24249	assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
291	24249	AN(vaip->vai_return);
292	24249	vaip->vai_return(wrk, vhdl, scaret);
293	24249	}
294
295		void
296	19982	ObjVAIfini(struct worker wrk, vai_hdl vhdlp)
297		{
298	19982	AN(vhdlp);
299	19982	struct vai_hdl_preamble vaip = vhdlp;
300
301	19982	AN(vaip);
302	19982	assert(vaip->magic2 == VAI_HDL_PREAMBLE_MAGIC2);
303	19982	AN(vaip->vai_lease);
304	19982	vaip->vai_fini(wrk, vhdlp);
305	19982	}
306
307		/*====================================================================
308		* ObjGetSpace()
309		*
310		* This function returns a pointer and length of free space. If there
311		* is no free space, some will be added first.
312		*
313		* The "sz" argument is an input hint of how much space is desired.
314		* 0 means "unknown", return some default size (maybe fetch_chunksize)
315		*/
316
317		int
318	464596	ObjGetSpace(struct worker wrk, struct objcore oc, ssize_t sz, uint8_t *ptr)
319		{
320	464596	const struct obj_methods *om = obj_getmethods(oc);
321
322	464596	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
323	464596	CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
324	464596	AN(sz);
325	464596	AN(ptr);
326	464596	assert(*sz >= 0);
327
328	464596	AN(om->objgetspace);
329	464596	return (om->objgetspace(wrk, oc, sz, ptr));
330		}
331
332		/*====================================================================
333		* ObjExtend()
334		*
335		* This function extends the used part of the object a number of bytes
336		* into the last space returned by ObjGetSpace()
337		*
338		* The final flag must be set on the last call, and it will release any
339		* surplus space allocated.
340		*/
341
342		static void
343	452871	obj_extend_condwait(const struct objcore *oc)
344		{
345
346	452871	if (oc->boc->transit_buffer == 0)
347	448925	return;
348
349	3946	assert(oc->flags & OC_F_TRANSIENT);
350	4285	while (!(oc->flags & OC_F_CANCEL) && oc->boc->fetched_so_far >
351	4269	oc->boc->delivered_so_far + oc->boc->transit_buffer)
352	339	(void)Lck_CondWait(&oc->boc->cond, &oc->boc->mtx);
353	452871	}
354
355		// notify of an extension of the boc or state change
356
357		static void
358	478777	obj_boc_notify(struct boc *boc)
359		{
360		struct vai_qe qe, next;
361
362	478777	PTOK(pthread_cond_broadcast(&boc->cond));
363	478777	qe = VSLIST_FIRST(&boc->vai_q_head);
364	478777	VSLIST_FIRST(&boc->vai_q_head) = NULL;
365	489548	while (qe != NULL) {
366	10771	CHECK_OBJ(qe, VAI_Q_MAGIC);
367	10771	AN(qe->flags & VAI_QF_INQUEUE);
368	10771	qe->flags &= ~VAI_QF_INQUEUE;
369	10771	next = VSLIST_NEXT(qe, list);
370	10771	VSLIST_NEXT(qe, list) = NULL;
371	10771	qe->cb(qe->hdl, qe->priv);
372	10771	qe = next;
373		}
374	478777	}
375
376		void
377	458369	ObjExtend(struct worker wrk, struct objcore oc, ssize_t l, int final)
378		{
379	458369	const struct obj_methods *om = obj_getmethods(oc);
380
381	458369	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
382	458369	CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
383	458369	AN(om->objextend);
384	458369	assert(l >= 0);
385
386	458369	if (l > 0) {
387	452872	Lck_Lock(&oc->boc->mtx);
388	452872	obj_extend_condwait(oc);
389	452872	om->objextend(wrk, oc, l);
390	452872	oc->boc->fetched_so_far += l;
391	452872	obj_boc_notify(oc->boc);
392	452872	Lck_Unlock(&oc->boc->mtx);
393
394	452872	if (oc->boc->transit_buffer > 0)
395	3946	wrk->stats->transit_buffered += l;
396	448926	else if (oc->flags & OC_F_TRANSIENT)
397	10838	wrk->stats->transit_stored += l;
398	452872	}
399
400	458369	assert(oc->boc->state < BOS_FINISHED);
401	458369	if (final && om->objtrimstore != NULL)
402	15383	om->objtrimstore(wrk, oc);
403	458369	}
404
405		/*====================================================================
406		*/
407
408		static inline void
409	37480	objSignalFetchLocked(const struct objcore *oc, uint64_t l)
410		{
411	37480	if (oc->boc->transit_buffer > 0) {
412	7709	assert(oc->flags & OC_F_TRANSIENT);
413		/* Signal the new client position */
414	7709	oc->boc->delivered_so_far = l;
415	7709	PTOK(pthread_cond_signal(&oc->boc->cond));
416	7709	}
417	37480	}
418
419		uint64_t
420	0	ObjWaitExtend(const struct worker wrk, const struct objcore oc, uint64_t l,
421		enum boc_state_e *statep)
422		{
423		enum boc_state_e state;
424		uint64_t rv;
425
426	0	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
427	0	CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
428	0	CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
429	0	Lck_Lock(&oc->boc->mtx);
430	0	while (1) {
431	0	rv = oc->boc->fetched_so_far;
432	0	assert(l <= rv \|\| oc->boc->state == BOS_FAILED);
433	0	state = oc->boc->state;
434	0	objSignalFetchLocked(oc, l);
435	0	if (rv > l \|\| state >= BOS_FINISHED)
436	0	break;
437	0	(void)Lck_CondWait(&oc->boc->cond, &oc->boc->mtx);
438		}
439	0	Lck_Unlock(&oc->boc->mtx);
440	0	if (statep != NULL)
441	0	*statep = state;
442	0	return (rv);
443		}
444
445		// get a new extension _or_ register a notification
446		uint64_t
447	37480	ObjVAIGetExtend(struct worker wrk, const struct objcore oc, uint64_t l,
448		enum boc_state_e statep, struct vai_qe qe)
449		{
450		enum boc_state_e state;
451		uint64_t rv;
452
453	37480	(void) wrk;
454	37480	CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
455	37480	CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);
456	37480	CHECK_OBJ_NOTNULL(qe, VAI_Q_MAGIC);
457	37480	Lck_Lock(&oc->boc->mtx);
458	37480	rv = oc->boc->fetched_so_far;
459	37480	assert(l <= rv \|\| oc->boc->state == BOS_FAILED);
460	37480	state = oc->boc->state;
461	37480	objSignalFetchLocked(oc, l);
462	37480	if (l == rv && state < BOS_FINISHED &&
463	20911	(qe->flags & VAI_QF_INQUEUE) == 0) {
464	10848	qe->flags \|= VAI_QF_INQUEUE;
465	10848	VSLIST_INSERT_HEAD(&oc->boc->vai_q_head, qe, list);
466	10848	}
467	37480	Lck_Unlock(&oc->boc->mtx);
468	37480	if (statep != NULL)
469	37491	*statep = state;
470	37506	return (rv);
471		}
472
473		void
474	6271	ObjVAICancel(struct worker wrk, struct boc boc, struct vai_qe *qe)
475		{
476
477	6271	(void) wrk;
478	6271	CHECK_OBJ_NOTNULL(boc, BOC_MAGIC);
479	6271	CHECK_OBJ_NOTNULL(qe, VAI_Q_MAGIC);
480
481	6271	Lck_Lock(&boc->mtx);
482		// inefficient, but should be rare
483	6271	if ((qe->flags & VAI_QF_INQUEUE) != 0)
484	78	VSLIST_REMOVE(&boc->vai_q_head, qe, vai_qe, list);
485	6271	qe->flags = 0;
486	6271	Lck_Unlock(&boc->mtx);
487	6271	}
488
489		/*====================================================================
490		*/
491
492		void
493	43382	ObjSetState(struct worker wrk, struct objcore oc, enum boc_state_e next,
494		unsigned broadcast)
495		{
496		const struct obj_methods *om;
497
498	43382	CHECK_OBJ_NOTNULL(oc, OBJCORE_MAGIC);
499	43382	CHECK_OBJ_NOTNULL(oc->boc, BOC_MAGIC);