| 1 | /* $NetBSD: puffs_subr.c,v 1.67 2014/11/10 18:46:33 maxv 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 1.67 2014/11/10 18:46:33 maxv Exp $" ); |
| 33 | |
| 34 | #include <sys/param.h> |
| 35 | #include <sys/buf.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 | const struct componentname *cn, int full) |
| 51 | { |
| 52 | |
| 53 | pkcn->pkcn_nameiop = cn->cn_nameiop; |
| 54 | pkcn->pkcn_flags = cn->cn_flags; |
| 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_parkdone_asyncbioread(struct puffs_mount *pmp, |
| 91 | struct puffs_req *preq, void *arg) |
| 92 | { |
| 93 | struct puffs_vnmsg_read *read_msg = (void *)preq; |
| 94 | struct buf *bp = arg; |
| 95 | size_t moved; |
| 96 | |
| 97 | DPRINTF(("%s\n" , __func__)); |
| 98 | |
| 99 | bp->b_error = checkerr(pmp, preq->preq_rv, __func__); |
| 100 | if (bp->b_error == 0) { |
| 101 | if (read_msg->pvnr_resid > bp->b_bcount) { |
| 102 | puffs_senderr(pmp, PUFFS_ERR_READ, E2BIG, |
| 103 | "resid grew" , preq->preq_cookie); |
| 104 | bp->b_error = E2BIG; |
| 105 | } else { |
| 106 | moved = bp->b_bcount - read_msg->pvnr_resid; |
| 107 | bp->b_resid = read_msg->pvnr_resid; |
| 108 | |
| 109 | memcpy(bp->b_data, read_msg->pvnr_data, moved); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | biodone(bp); |
| 114 | } |
| 115 | |
| 116 | void |
| 117 | puffs_parkdone_asyncbiowrite(struct puffs_mount *pmp, |
| 118 | struct puffs_req *preq, void *arg) |
| 119 | { |
| 120 | struct puffs_vnmsg_write *write_msg = (void *)preq; |
| 121 | struct buf *bp = arg; |
| 122 | |
| 123 | DPRINTF(("%s\n" , __func__)); |
| 124 | |
| 125 | bp->b_error = checkerr(pmp, preq->preq_rv, __func__); |
| 126 | if (bp->b_error == 0) { |
| 127 | if (write_msg->pvnr_resid > bp->b_bcount) { |
| 128 | puffs_senderr(pmp, PUFFS_ERR_WRITE, E2BIG, |
| 129 | "resid grew" , preq->preq_cookie); |
| 130 | bp->b_error = E2BIG; |
| 131 | } else { |
| 132 | bp->b_resid = write_msg->pvnr_resid; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | biodone(bp); |
| 137 | } |
| 138 | |
| 139 | /* XXX: userspace can leak kernel resources */ |
| 140 | void |
| 141 | puffs_parkdone_poll(struct puffs_mount *pmp, struct puffs_req *preq, void *arg) |
| 142 | { |
| 143 | struct puffs_vnmsg_poll *poll_msg = (void *)preq; |
| 144 | struct puffs_node *pn = arg; |
| 145 | int revents, error; |
| 146 | |
| 147 | error = checkerr(pmp, preq->preq_rv, __func__); |
| 148 | if (error) |
| 149 | revents = poll_msg->pvnr_events; |
| 150 | else |
| 151 | revents = POLLERR; |
| 152 | |
| 153 | mutex_enter(&pn->pn_mtx); |
| 154 | pn->pn_revents |= revents; |
| 155 | mutex_exit(&pn->pn_mtx); |
| 156 | |
| 157 | selnotify(&pn->pn_sel, revents, 0); |
| 158 | |
| 159 | puffs_releasenode(pn); |
| 160 | } |
| 161 | |
| 162 | void |
| 163 | puffs_mp_reference(struct puffs_mount *pmp) |
| 164 | { |
| 165 | |
| 166 | KASSERT(mutex_owned(&pmp->pmp_lock)); |
| 167 | pmp->pmp_refcount++; |
| 168 | } |
| 169 | |
| 170 | void |
| 171 | puffs_mp_release(struct puffs_mount *pmp) |
| 172 | { |
| 173 | |
| 174 | KASSERT(mutex_owned(&pmp->pmp_lock)); |
| 175 | if (--pmp->pmp_refcount == 0) |
| 176 | cv_broadcast(&pmp->pmp_refcount_cv); |
| 177 | } |
| 178 | |
| 179 | void |
| 180 | puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp, |
| 181 | int flags) |
| 182 | { |
| 183 | |
| 184 | *eobp = size; |
| 185 | } |
| 186 | |
| 187 | void |
| 188 | puffs_gop_markupdate(struct vnode *vp, int flags) |
| 189 | { |
| 190 | int uflags = 0; |
| 191 | |
| 192 | if (flags & GOP_UPDATE_ACCESSED) |
| 193 | uflags |= PUFFS_UPDATEATIME; |
| 194 | if (flags & GOP_UPDATE_MODIFIED) |
| 195 | uflags |= PUFFS_UPDATEMTIME; |
| 196 | |
| 197 | puffs_updatenode(VPTOPP(vp), uflags, 0); |
| 198 | } |
| 199 | |
| 200 | void |
| 201 | puffs_senderr(struct puffs_mount *pmp, int type, int error, |
| 202 | const char *str, puffs_cookie_t ck) |
| 203 | { |
| 204 | struct puffs_msgpark *park; |
| 205 | struct puffs_error *perr; |
| 206 | |
| 207 | puffs_msgmem_alloc(sizeof(struct puffs_error), &park, (void *)&perr, 1); |
| 208 | puffs_msg_setfaf(park); |
| 209 | puffs_msg_setinfo(park, PUFFSOP_ERROR, type, ck); |
| 210 | |
| 211 | perr->perr_error = error; |
| 212 | strlcpy(perr->perr_str, str, sizeof(perr->perr_str)); |
| 213 | |
| 214 | puffs_msg_enqueue(pmp, park); |
| 215 | puffs_msgmem_release(park); |
| 216 | } |
| 217 | |