1 /* $NetBSD: puffs_subr.c,v 1.66 2008/11/16 19:34:30 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 1.66 2008/11/16 19:34:30 pooka Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/buf.h> 36 #include <sys/malloc.h> 37 #include <sys/mount.h> 38 #include <sys/namei.h> 39 #include <sys/poll.h> 40 #include <sys/proc.h> 41 42 #include <fs/puffs/puffs_msgif.h> 43 #include <fs/puffs/puffs_sys.h> 44 45 #ifdef PUFFSDEBUG 46 int puffsdebug; 47 #endif 48 49 void 50 puffs_makecn(struct puffs_kcn *pkcn, struct puffs_kcred *pkcr, 51 const struct componentname *cn, int full) 52 { 53 54 pkcn->pkcn_nameiop = cn->cn_nameiop; 55 pkcn->pkcn_flags = cn->cn_flags; 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_parkdone_asyncbioread(struct puffs_mount *pmp, 92 struct puffs_req *preq, void *arg) 93 { 94 struct puffs_vnmsg_read *read_msg = (void *)preq; 95 struct buf *bp = arg; 96 size_t moved; 97 98 DPRINTF(("%s\n", __func__)); 99 100 bp->b_error = checkerr(pmp, preq->preq_rv, __func__); 101 if (bp->b_error == 0) { 102 if (read_msg->pvnr_resid > bp->b_bcount) { 103 puffs_senderr(pmp, PUFFS_ERR_READ, E2BIG, 104 "resid grew", preq->preq_cookie); 105 bp->b_error = E2BIG; 106 } else { 107 moved = bp->b_bcount - read_msg->pvnr_resid; 108 bp->b_resid = read_msg->pvnr_resid; 109 110 memcpy(bp->b_data, read_msg->pvnr_data, moved); 111 } 112 } 113 114 biodone(bp); 115 } 116 117 void 118 puffs_parkdone_asyncbiowrite(struct puffs_mount *pmp, 119 struct puffs_req *preq, void *arg) 120 { 121 struct puffs_vnmsg_write *write_msg = (void *)preq; 122 struct buf *bp = arg; 123 124 DPRINTF(("%s\n", __func__)); 125 126 bp->b_error = checkerr(pmp, preq->preq_rv, __func__); 127 if (bp->b_error == 0) { 128 if (write_msg->pvnr_resid > bp->b_bcount) { 129 puffs_senderr(pmp, PUFFS_ERR_WRITE, E2BIG, 130 "resid grew", preq->preq_cookie); 131 bp->b_error = E2BIG; 132 } else { 133 bp->b_resid = write_msg->pvnr_resid; 134 } 135 } 136 137 biodone(bp); 138 } 139 140 /* XXX: userspace can leak kernel resources */ 141 void 142 puffs_parkdone_poll(struct puffs_mount *pmp, struct puffs_req *preq, void *arg) 143 { 144 struct puffs_vnmsg_poll *poll_msg = (void *)preq; 145 struct puffs_node *pn = arg; 146 int revents, error; 147 148 error = checkerr(pmp, preq->preq_rv, __func__); 149 if (error) 150 revents = poll_msg->pvnr_events; 151 else 152 revents = POLLERR; 153 154 mutex_enter(&pn->pn_mtx); 155 pn->pn_revents |= revents; 156 mutex_exit(&pn->pn_mtx); 157 158 selnotify(&pn->pn_sel, revents, 0); 159 160 puffs_releasenode(pn); 161 } 162 163 void 164 puffs_mp_reference(struct puffs_mount *pmp) 165 { 166 167 KASSERT(mutex_owned(&pmp->pmp_lock)); 168 pmp->pmp_refcount++; 169 } 170 171 void 172 puffs_mp_release(struct puffs_mount *pmp) 173 { 174 175 KASSERT(mutex_owned(&pmp->pmp_lock)); 176 if (--pmp->pmp_refcount == 0) 177 cv_broadcast(&pmp->pmp_refcount_cv); 178 } 179 180 void 181 puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp, 182 int flags) 183 { 184 185 *eobp = size; 186 } 187 188 void 189 puffs_gop_markupdate(struct vnode *vp, int flags) 190 { 191 int uflags = 0; 192 193 if (flags & GOP_UPDATE_ACCESSED) 194 uflags |= PUFFS_UPDATEATIME; 195 if (flags & GOP_UPDATE_MODIFIED) 196 uflags |= PUFFS_UPDATEMTIME; 197 198 puffs_updatenode(VPTOPP(vp), uflags, 0); 199 } 200 201 void 202 puffs_senderr(struct puffs_mount *pmp, int type, int error, 203 const char *str, puffs_cookie_t ck) 204 { 205 struct puffs_msgpark *park; 206 struct puffs_error *perr; 207 208 puffs_msgmem_alloc(sizeof(struct puffs_error), &park, (void *)&perr, 1); 209 puffs_msg_setfaf(park); 210 puffs_msg_setinfo(park, PUFFSOP_ERROR, type, ck); 211 212 perr->perr_error = error; 213 strlcpy(perr->perr_str, str, sizeof(perr->perr_str)); 214 215 puffs_msg_enqueue(pmp, park); 216 puffs_msgmem_release(park); 217 } 218