1 /* $NetBSD: puffs_subr.c,v 1.57 2007/10/11 19:41:14 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 1.57 2007/10/11 19:41:14 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 #include <sys/proc.h> 40 41 #include <fs/puffs/puffs_msgif.h> 42 #include <fs/puffs/puffs_sys.h> 43 44 #ifdef PUFFSDEBUG 45 int puffsdebug; 46 #endif 47 48 void 49 puffs_makecn(struct puffs_kcn *pkcn, struct puffs_kcred *pkcr, 50 struct puffs_kcid *pkcid, const struct componentname *cn, int full) 51 { 52 53 pkcn->pkcn_nameiop = cn->cn_nameiop; 54 pkcn->pkcn_flags = cn->cn_flags; 55 puffs_cidcvt(pkcid, cn->cn_lwp); 56 57 if (full) { 58 (void)strcpy(pkcn->pkcn_name, cn->cn_nameptr); 59 } else { 60 (void)memcpy(pkcn->pkcn_name, cn->cn_nameptr, cn->cn_namelen); 61 pkcn->pkcn_name[cn->cn_namelen] = '\0'; 62 } 63 pkcn->pkcn_namelen = cn->cn_namelen; 64 pkcn->pkcn_consume = 0; 65 66 puffs_credcvt(pkcr, cn->cn_cred); 67 } 68 69 /* 70 * Convert given credentials to struct puffs_kcred for userspace. 71 */ 72 void 73 puffs_credcvt(struct puffs_kcred *pkcr, const kauth_cred_t cred) 74 { 75 76 memset(pkcr, 0, sizeof(struct puffs_kcred)); 77 78 if (cred == NOCRED || cred == FSCRED) { 79 pkcr->pkcr_type = PUFFCRED_TYPE_INTERNAL; 80 if (cred == NOCRED) 81 pkcr->pkcr_internal = PUFFCRED_CRED_NOCRED; 82 if (cred == FSCRED) 83 pkcr->pkcr_internal = PUFFCRED_CRED_FSCRED; 84 } else { 85 pkcr->pkcr_type = PUFFCRED_TYPE_UUC; 86 kauth_cred_to_uucred(&pkcr->pkcr_uuc, cred); 87 } 88 } 89 90 void 91 puffs_cidcvt(struct puffs_kcid *pkcid, const struct lwp *l) 92 { 93 94 if (l) { 95 pkcid->pkcid_type = PUFFCID_TYPE_REAL; 96 pkcid->pkcid_pid = l->l_proc->p_pid; 97 pkcid->pkcid_lwpid = l->l_lid; 98 } else { 99 pkcid->pkcid_type = PUFFCID_TYPE_FAKE; 100 pkcid->pkcid_pid = 0; 101 pkcid->pkcid_lwpid = 0; 102 } 103 } 104 105 void 106 puffs_parkdone_asyncbioread(struct puffs_mount *pmp, 107 struct puffs_req *preq, void *arg) 108 { 109 struct puffs_vnmsg_read *read_msg = (void *)preq; 110 struct buf *bp = arg; 111 size_t moved; 112 113 bp->b_error = checkerr(pmp, preq->preq_rv, __func__); 114 if (bp->b_error == 0) { 115 moved = bp->b_bcount - read_msg->pvnr_resid; 116 bp->b_resid = read_msg->pvnr_resid; 117 118 memcpy(bp->b_data, read_msg->pvnr_data, moved); 119 } 120 121 biodone(bp); 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_vnmsg_poll *poll_msg = (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_msg->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); 143 144 puffs_releasenode(pn); 145 } 146 147 void 148 puffs_mp_reference(struct puffs_mount *pmp) 149 { 150 151 KASSERT(mutex_owned(&pmp->pmp_lock)); 152 pmp->pmp_refcount++; 153 } 154 155 void 156 puffs_mp_release(struct puffs_mount *pmp) 157 { 158 159 KASSERT(mutex_owned(&pmp->pmp_lock)); 160 if (--pmp->pmp_refcount == 0) 161 cv_broadcast(&pmp->pmp_refcount_cv); 162 } 163 164 void 165 puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp, 166 int flags) 167 { 168 169 *eobp = size; 170 } 171 172 void 173 puffs_gop_markupdate(struct vnode *vp, int flags) 174 { 175 int uflags = 0; 176 177 if (flags & GOP_UPDATE_ACCESSED) 178 uflags |= PUFFS_UPDATEATIME; 179 if (flags & GOP_UPDATE_MODIFIED) 180 uflags |= PUFFS_UPDATEMTIME; 181 182 puffs_updatenode(vp, uflags); 183 } 184