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Annotation of src/sys/fs/puffs/puffs_subr.c, Revision 1.61

1.61    ! pooka       1: /*     $NetBSD: puffs_subr.c,v 1.60 2007/11/17 21:55:29 pooka Exp $    */
1.1       pooka       2:
                      3: /*
1.53      pooka       4:  * Copyright (c) 2006, 2007  Antti Kantee.  All Rights Reserved.
1.1       pooka       5:  *
                      6:  * Development of this software was supported by the
1.53      pooka       7:  * Ulla Tuominen Foundation and the Finnish Cultural Foundation.
1.1       pooka       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>
1.61    ! pooka      32: __KERNEL_RCSID(0, "$NetBSD: puffs_subr.c,v 1.60 2007/11/17 21:55:29 pooka Exp $");
1.1       pooka      33:
                     34: #include <sys/param.h>
                     35: #include <sys/malloc.h>
                     36: #include <sys/mount.h>
1.31      pooka      37: #include <sys/namei.h>
                     38: #include <sys/poll.h>
1.56      ad         39: #include <sys/proc.h>
1.1       pooka      40:
                     41: #include <fs/puffs/puffs_msgif.h>
                     42: #include <fs/puffs/puffs_sys.h>
                     43:
1.19      pooka      44: #ifdef PUFFSDEBUG
1.10      pooka      45: int puffsdebug;
                     46: #endif
                     47:
1.1       pooka      48: void
1.36      pooka      49: puffs_makecn(struct puffs_kcn *pkcn, struct puffs_kcred *pkcr,
1.38      pooka      50:        struct puffs_kcid *pkcid, const struct componentname *cn, int full)
1.1       pooka      51: {
                     52:
1.12      pooka      53:        pkcn->pkcn_nameiop = cn->cn_nameiop;
                     54:        pkcn->pkcn_flags = cn->cn_flags;
1.1       pooka      55:
1.38      pooka      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:        }
1.12      pooka      62:        pkcn->pkcn_namelen = cn->cn_namelen;
1.38      pooka      63:        pkcn->pkcn_consume = 0;
1.36      pooka      64:
                     65:        puffs_credcvt(pkcr, cn->cn_cred);
1.1       pooka      66: }
                     67:
                     68: /*
1.36      pooka      69:  * Convert given credentials to struct puffs_kcred for userspace.
1.1       pooka      70:  */
                     71: void
1.36      pooka      72: puffs_credcvt(struct puffs_kcred *pkcr, const kauth_cred_t cred)
1.1       pooka      73: {
                     74:
1.36      pooka      75:        memset(pkcr, 0, sizeof(struct puffs_kcred));
1.1       pooka      76:
                     77:        if (cred == NOCRED || cred == FSCRED) {
1.36      pooka      78:                pkcr->pkcr_type = PUFFCRED_TYPE_INTERNAL;
1.1       pooka      79:                if (cred == NOCRED)
1.36      pooka      80:                        pkcr->pkcr_internal = PUFFCRED_CRED_NOCRED;
1.1       pooka      81:                if (cred == FSCRED)
1.36      pooka      82:                        pkcr->pkcr_internal = PUFFCRED_CRED_FSCRED;
1.1       pooka      83:        } else {
1.36      pooka      84:                pkcr->pkcr_type = PUFFCRED_TYPE_UUC;
                     85:                kauth_cred_to_uucred(&pkcr->pkcr_uuc, cred);
1.1       pooka      86:        }
                     87: }
                     88:
1.37      pooka      89: void
                     90: puffs_cidcvt(struct puffs_kcid *pkcid, const struct lwp *l)
1.1       pooka      91: {
                     92:
1.37      pooka      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:        }
1.1       pooka     102: }
1.7       pooka     103:
1.9       pooka     104: void
1.55      pooka     105: puffs_parkdone_asyncbioread(struct puffs_mount *pmp,
                    106:        struct puffs_req *preq, void *arg)
1.27      pooka     107: {
1.57      pooka     108:        struct puffs_vnmsg_read *read_msg = (void *)preq;
1.27      pooka     109:        struct buf *bp = arg;
                    110:        size_t moved;
                    111:
1.59      pooka     112:        DPRINTF(("%s\n", __func__));
                    113:
1.55      pooka     114:        bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
1.27      pooka     115:        if (bp->b_error == 0) {
1.59      pooka     116:                if (read_msg->pvnr_resid > bp->b_bcount) {
                    117:                        puffs_senderr(pmp, PUFFS_ERR_READ, E2BIG,
                    118:                            "resid grew", preq->preq_cookie);
                    119:                        bp->b_error = E2BIG;
                    120:                } else {
                    121:                        moved = bp->b_bcount - read_msg->pvnr_resid;
                    122:                        bp->b_resid = read_msg->pvnr_resid;
                    123:
                    124:                        memcpy(bp->b_data, read_msg->pvnr_data, moved);
                    125:                }
                    126:        }
                    127:
                    128:        biodone(bp);
                    129: }
                    130:
                    131: void
                    132: puffs_parkdone_asyncbiowrite(struct puffs_mount *pmp,
                    133:        struct puffs_req *preq, void *arg)
                    134: {
                    135:        struct puffs_vnmsg_write *write_msg = (void *)preq;
                    136:        struct buf *bp = arg;
1.27      pooka     137:
1.59      pooka     138:        DPRINTF(("%s\n", __func__));
                    139:
                    140:        bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
                    141:        if (bp->b_error == 0) {
                    142:                if (write_msg->pvnr_resid > bp->b_bcount) {
                    143:                        puffs_senderr(pmp, PUFFS_ERR_WRITE, E2BIG,
                    144:                            "resid grew", preq->preq_cookie);
                    145:                        bp->b_error = E2BIG;
                    146:                } else {
                    147:                        bp->b_resid = write_msg->pvnr_resid;
                    148:                }
1.27      pooka     149:        }
                    150:
                    151:        biodone(bp);
                    152: }
1.28      pooka     153:
1.44      pooka     154: /* XXX: userspace can leak kernel resources */
1.28      pooka     155: void
1.55      pooka     156: puffs_parkdone_poll(struct puffs_mount *pmp, struct puffs_req *preq, void *arg)
1.31      pooka     157: {
1.57      pooka     158:        struct puffs_vnmsg_poll *poll_msg = (void *)preq;
1.31      pooka     159:        struct puffs_node *pn = arg;
1.55      pooka     160:        int revents, error;
1.31      pooka     161:
1.55      pooka     162:        error = checkerr(pmp, preq->preq_rv, __func__);
                    163:        if (error)
1.57      pooka     164:                revents = poll_msg->pvnr_events;
1.31      pooka     165:        else
                    166:                revents = POLLERR;
                    167:
                    168:        mutex_enter(&pn->pn_mtx);
                    169:        pn->pn_revents |= revents;
                    170:        mutex_exit(&pn->pn_mtx);
                    171:
                    172:        selnotify(&pn->pn_sel, 0);
                    173:
                    174:        puffs_releasenode(pn);
                    175: }
                    176:
                    177: void
1.28      pooka     178: puffs_mp_reference(struct puffs_mount *pmp)
                    179: {
                    180:
                    181:        KASSERT(mutex_owned(&pmp->pmp_lock));
                    182:        pmp->pmp_refcount++;
                    183: }
                    184:
                    185: void
                    186: puffs_mp_release(struct puffs_mount *pmp)
                    187: {
                    188:
                    189:        KASSERT(mutex_owned(&pmp->pmp_lock));
                    190:        if (--pmp->pmp_refcount == 0)
                    191:                cv_broadcast(&pmp->pmp_refcount_cv);
                    192: }
1.53      pooka     193:
                    194: void
                    195: puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp,
                    196:        int flags)
                    197: {
                    198:
                    199:        *eobp = size;
                    200: }
                    201:
                    202: void
                    203: puffs_gop_markupdate(struct vnode *vp, int flags)
                    204: {
                    205:        int uflags = 0;
                    206:
                    207:        if (flags & GOP_UPDATE_ACCESSED)
                    208:                uflags |= PUFFS_UPDATEATIME;
                    209:        if (flags & GOP_UPDATE_MODIFIED)
                    210:                uflags |= PUFFS_UPDATEMTIME;
                    211:
1.60      pooka     212:        puffs_updatenode(VPTOPP(vp), uflags, 0);
1.53      pooka     213: }
1.58      pooka     214:
                    215: void
                    216: puffs_senderr(struct puffs_mount *pmp, int type, int error,
                    217:        const char *str, void *cookie)
                    218: {
                    219:        struct puffs_msgpark *park;
                    220:        struct puffs_error *perr;
                    221:
                    222:        puffs_msgmem_alloc(sizeof(struct puffs_error), &park, (void**)&perr, 1);
                    223:        puffs_msg_setfaf(park);
                    224:        puffs_msg_setinfo(park, PUFFSOP_ERROR, type, cookie);
                    225:
                    226:        perr->perr_error = error;
                    227:        strlcpy(perr->perr_str, str, sizeof(perr->perr_str));
                    228:
                    229:        puffs_msg_enqueue(pmp, park);
                    230:        puffs_msgmem_release(park);
                    231: }

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