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puffs_subr.c revision 1.55 
      1 /*	$NetBSD: puffs_subr.c,v 1.55 2007/10/01 21:09:08 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006, 2007  Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by the
      7  * Ulla Tuominen Foundation and the Finnish Cultural Foundation.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: puffs_subr.c,v 1.55 2007/10/01 21:09:08 pooka Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/malloc.h>
     36 #include <sys/mount.h>
     37 #include <sys/namei.h>
     38 #include <sys/poll.h>
     39 
     40 #include <fs/puffs/puffs_msgif.h>
     41 #include <fs/puffs/puffs_sys.h>
     42 
     43 #ifdef PUFFSDEBUG
     44 int puffsdebug;
     45 #endif
     46 
     47 void
     48 puffs_makecn(struct puffs_kcn *pkcn, struct puffs_kcred *pkcr,
     49 	struct puffs_kcid *pkcid, const struct componentname *cn, int full)
     50 {
     51 
     52 	pkcn->pkcn_nameiop = cn->cn_nameiop;
     53 	pkcn->pkcn_flags = cn->cn_flags;
     54 	puffs_cidcvt(pkcid, cn->cn_lwp);
     55 
     56 	if (full) {
     57 		(void)strcpy(pkcn->pkcn_name, cn->cn_nameptr);
     58 	} else {
     59 		(void)memcpy(pkcn->pkcn_name, cn->cn_nameptr, cn->cn_namelen);
     60 		pkcn->pkcn_name[cn->cn_namelen] = '\0';
     61 	}
     62 	pkcn->pkcn_namelen = cn->cn_namelen;
     63 	pkcn->pkcn_consume = 0;
     64 
     65 	puffs_credcvt(pkcr, cn->cn_cred);
     66 }
     67 
     68 /*
     69  * Convert given credentials to struct puffs_kcred for userspace.
     70  */
     71 void
     72 puffs_credcvt(struct puffs_kcred *pkcr, const kauth_cred_t cred)
     73 {
     74 
     75 	memset(pkcr, 0, sizeof(struct puffs_kcred));
     76 
     77 	if (cred == NOCRED || cred == FSCRED) {
     78 		pkcr->pkcr_type = PUFFCRED_TYPE_INTERNAL;
     79 		if (cred == NOCRED)
     80 			pkcr->pkcr_internal = PUFFCRED_CRED_NOCRED;
     81 		if (cred == FSCRED)
     82 			pkcr->pkcr_internal = PUFFCRED_CRED_FSCRED;
     83  	} else {
     84 		pkcr->pkcr_type = PUFFCRED_TYPE_UUC;
     85 		kauth_cred_to_uucred(&pkcr->pkcr_uuc, cred);
     86 	}
     87 }
     88 
     89 void
     90 puffs_cidcvt(struct puffs_kcid *pkcid, const struct lwp *l)
     91 {
     92 
     93 	if (l) {
     94 		pkcid->pkcid_type = PUFFCID_TYPE_REAL;
     95 		pkcid->pkcid_pid = l->l_proc->p_pid;
     96 		pkcid->pkcid_lwpid = l->l_lid;
     97 	} else {
     98 		pkcid->pkcid_type = PUFFCID_TYPE_FAKE;
     99 		pkcid->pkcid_pid = 0;
    100 		pkcid->pkcid_lwpid = 0;
    101 	}
    102 }
    103 
    104 void
    105 puffs_parkdone_asyncbioread(struct puffs_mount *pmp,
    106 	struct puffs_req *preq, void *arg)
    107 {
    108 	struct puffs_vnreq_read *read_argp = (void *)preq;
    109 	struct buf *bp = arg;
    110 	size_t moved;
    111 
    112 	bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
    113 	if (bp->b_error == 0) {
    114 		moved = bp->b_bcount - read_argp->pvnr_resid;
    115 		bp->b_resid = read_argp->pvnr_resid;
    116 
    117 		memcpy(bp->b_data, read_argp->pvnr_data, moved);
    118 	}
    119 
    120 	biodone(bp);
    121 	free(preq, M_PUFFS);
    122 }
    123 
    124 /* XXX: userspace can leak kernel resources */
    125 void
    126 puffs_parkdone_poll(struct puffs_mount *pmp, struct puffs_req *preq, void *arg)
    127 {
    128 	struct puffs_vnreq_poll *poll_argp = (void *)preq;
    129 	struct puffs_node *pn = arg;
    130 	int revents, error;
    131 
    132 	error = checkerr(pmp, preq->preq_rv, __func__);
    133 	if (error)
    134 		revents = poll_argp->pvnr_events;
    135 	else
    136 		revents = POLLERR;
    137 
    138 	mutex_enter(&pn->pn_mtx);
    139 	pn->pn_revents |= revents;
    140 	mutex_exit(&pn->pn_mtx);
    141 
    142 	selnotify(&pn->pn_sel, 0);
    143 	free(preq, M_PUFFS);
    144 
    145 	puffs_releasenode(pn);
    146 }
    147 
    148 void
    149 puffs_mp_reference(struct puffs_mount *pmp)
    150 {
    151 
    152 	KASSERT(mutex_owned(&pmp->pmp_lock));
    153 	pmp->pmp_refcount++;
    154 }
    155 
    156 void
    157 puffs_mp_release(struct puffs_mount *pmp)
    158 {
    159 
    160 	KASSERT(mutex_owned(&pmp->pmp_lock));
    161 	if (--pmp->pmp_refcount == 0)
    162 		cv_broadcast(&pmp->pmp_refcount_cv);
    163 }
    164 
    165 void
    166 puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp,
    167 	int flags)
    168 {
    169 
    170 	*eobp = size;
    171 }
    172 
    173 void
    174 puffs_gop_markupdate(struct vnode *vp, int flags)
    175 {
    176 	int uflags = 0;
    177 
    178 	if (flags & GOP_UPDATE_ACCESSED)
    179 		uflags |= PUFFS_UPDATEATIME;
    180 	if (flags & GOP_UPDATE_MODIFIED)
    181 		uflags |= PUFFS_UPDATEMTIME;
    182 
    183 	puffs_updatenode(vp, uflags);
    184 }
    185