/*      $NetBSD: puffs_subr.c,v 1.67 2014/11/10 18:46:33 maxv Exp $     */

/*
* Copyright (c) 2006, 2007  Antti Kantee.  All Rights Reserved.
*
* Development of this software was supported by the
* Ulla Tuominen Foundation and the Finnish Cultural Foundation.
*
* 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 ``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 THE 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: puffs_subr.c,v 1.67 2014/11/10 18:46:33 maxv Exp $");

#include <sys/param.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/poll.h>
#include <sys/proc.h>

#include <fs/puffs/puffs_msgif.h>
#include <fs/puffs/puffs_sys.h>

#ifdef PUFFSDEBUG
int puffsdebug;
#endif

void
puffs_makecn(struct puffs_kcn *pkcn, struct puffs_kcred *pkcr,
       const struct componentname *cn, int full)
{

       pkcn->pkcn_nameiop = cn->cn_nameiop;
       pkcn->pkcn_flags = cn->cn_flags;

       if (full) {
               (void)strcpy(pkcn->pkcn_name, cn->cn_nameptr);
       } else {
               (void)memcpy(pkcn->pkcn_name, cn->cn_nameptr, cn->cn_namelen);
               pkcn->pkcn_name[cn->cn_namelen] = '\0';
       }
       pkcn->pkcn_namelen = cn->cn_namelen;
       pkcn->pkcn_consume = 0;

       puffs_credcvt(pkcr, cn->cn_cred);
}

/*
* Convert given credentials to struct puffs_kcred for userspace.
*/
void
puffs_credcvt(struct puffs_kcred *pkcr, const kauth_cred_t cred)
{

       memset(pkcr, 0, sizeof(struct puffs_kcred));

       if (cred == NOCRED || cred == FSCRED) {
               pkcr->pkcr_type = PUFFCRED_TYPE_INTERNAL;
               if (cred == NOCRED)
                       pkcr->pkcr_internal = PUFFCRED_CRED_NOCRED;
               if (cred == FSCRED)
                       pkcr->pkcr_internal = PUFFCRED_CRED_FSCRED;
       } else {
               pkcr->pkcr_type = PUFFCRED_TYPE_UUC;
               kauth_cred_to_uucred(&pkcr->pkcr_uuc, cred);
       }
}

void
puffs_parkdone_asyncbioread(struct puffs_mount *pmp,
       struct puffs_req *preq, void *arg)
{
       struct puffs_vnmsg_read *read_msg = (void *)preq;
       struct buf *bp = arg;
       size_t moved;

       DPRINTF(("%s\n", __func__));

       bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
       if (bp->b_error == 0) {
               if (read_msg->pvnr_resid > bp->b_bcount) {
                       puffs_senderr(pmp, PUFFS_ERR_READ, E2BIG,
                           "resid grew", preq->preq_cookie);
                       bp->b_error = E2BIG;
               } else {
                       moved = bp->b_bcount - read_msg->pvnr_resid;
                       bp->b_resid = read_msg->pvnr_resid;

                       memcpy(bp->b_data, read_msg->pvnr_data, moved);
               }
       }

       biodone(bp);
}

void
puffs_parkdone_asyncbiowrite(struct puffs_mount *pmp,
       struct puffs_req *preq, void *arg)
{
       struct puffs_vnmsg_write *write_msg = (void *)preq;
       struct buf *bp = arg;

       DPRINTF(("%s\n", __func__));

       bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
       if (bp->b_error == 0) {
               if (write_msg->pvnr_resid > bp->b_bcount) {
                       puffs_senderr(pmp, PUFFS_ERR_WRITE, E2BIG,
                           "resid grew", preq->preq_cookie);
                       bp->b_error = E2BIG;
               } else {
                       bp->b_resid = write_msg->pvnr_resid;
               }
       }

       biodone(bp);
}

/* XXX: userspace can leak kernel resources */
void
puffs_parkdone_poll(struct puffs_mount *pmp, struct puffs_req *preq, void *arg)
{
       struct puffs_vnmsg_poll *poll_msg = (void *)preq;
       struct puffs_node *pn = arg;
       int revents, error;

       error = checkerr(pmp, preq->preq_rv, __func__);
       if (error)
               revents = poll_msg->pvnr_events;
       else
               revents = POLLERR;

       mutex_enter(&pn->pn_mtx);
       pn->pn_revents |= revents;
       mutex_exit(&pn->pn_mtx);

       selnotify(&pn->pn_sel, revents, 0);

       puffs_releasenode(pn);
}

void
puffs_mp_reference(struct puffs_mount *pmp)
{

       KASSERT(mutex_owned(&pmp->pmp_lock));
       pmp->pmp_refcount++;
}

void
puffs_mp_release(struct puffs_mount *pmp)
{

       KASSERT(mutex_owned(&pmp->pmp_lock));
       if (--pmp->pmp_refcount == 0)
               cv_broadcast(&pmp->pmp_refcount_cv);
}

void
puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp,
       int flags)
{

       *eobp = size;
}

void
puffs_gop_markupdate(struct vnode *vp, int flags)
{
       int uflags = 0;

       if (flags & GOP_UPDATE_ACCESSED)
               uflags |= PUFFS_UPDATEATIME;
       if (flags & GOP_UPDATE_MODIFIED)
               uflags |= PUFFS_UPDATEMTIME;

       puffs_updatenode(VPTOPP(vp), uflags, 0);
}

void
puffs_senderr(struct puffs_mount *pmp, int type, int error,
       const char *str, puffs_cookie_t ck)
{
       struct puffs_msgpark *park;
       struct puffs_error *perr;

       puffs_msgmem_alloc(sizeof(struct puffs_error), &park, (void *)&perr, 1);
       puffs_msg_setfaf(park);
       puffs_msg_setinfo(park, PUFFSOP_ERROR, type, ck);

       perr->perr_error = error;
       strlcpy(perr->perr_str, str, sizeof(perr->perr_str));

       puffs_msg_enqueue(pmp, park);
       puffs_msgmem_release(park);
}

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