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/* $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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