/* $NetBSD: advnops.c,v 1.4 2003/01/27 04:08:45 lonewolf Exp $ */ /* * Copyright (c) 1994 Christian E. Hopps * Copyright (c) 1996 Matthias Scheler * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Christian E. Hopps. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: advnops.c,v 1.4 2003/01/27 04:08:45 lonewolf Exp $"); #if defined(_KERNEL_OPT) #include "opt_quota.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern struct vnodeops adosfs_vnodeops; #define adosfs_open genfs_nullop int adosfs_getattr __P((void *)); int adosfs_read __P((void *)); int adosfs_write __P((void *)); #define adosfs_fcntl genfs_fcntl #define adosfs_ioctl genfs_enoioctl #define adosfs_poll genfs_poll int adosfs_strategy __P((void *)); int adosfs_link __P((void *)); int adosfs_symlink __P((void *)); #define adosfs_abortop genfs_abortop int adosfs_bmap __P((void *)); int adosfs_print __P((void *)); int adosfs_readdir __P((void *)); int adosfs_access __P((void *)); int adosfs_readlink __P((void *)); int adosfs_inactive __P((void *)); int adosfs_reclaim __P((void *)); int adosfs_pathconf __P((void *)); #define adosfs_close genfs_nullop #define adosfs_fsync genfs_nullop #define adosfs_lease_check genfs_lease_check #define adosfs_seek genfs_seek #define adosfs_vfree genfs_nullop #define adosfs_advlock genfs_einval #define adosfs_blkatoff genfs_eopnotsupp #define adosfs_bwrite genfs_eopnotsupp #define adosfs_create genfs_eopnotsupp #define adosfs_mkdir genfs_eopnotsupp #define adosfs_mknod genfs_eopnotsupp #define adosfs_revoke genfs_revoke #define adosfs_mmap genfs_mmap #define adosfs_remove genfs_eopnotsupp #define adosfs_rename genfs_eopnotsupp #define adosfs_rmdir genfs_eopnotsupp #define adosfs_setattr genfs_eopnotsupp #define adosfs_truncate genfs_eopnotsupp #define adosfs_update genfs_nullop #define adosfs_valloc genfs_eopnotsupp const struct vnodeopv_entry_desc adosfs_vnodeop_entries[] = { { &vop_default_desc, vn_default_error }, { &vop_lookup_desc, adosfs_lookup }, /* lookup */ { &vop_create_desc, adosfs_create }, /* create */ { &vop_mknod_desc, adosfs_mknod }, /* mknod */ { &vop_open_desc, adosfs_open }, /* open */ { &vop_close_desc, adosfs_close }, /* close */ { &vop_access_desc, adosfs_access }, /* access */ { &vop_getattr_desc, adosfs_getattr }, /* getattr */ { &vop_setattr_desc, adosfs_setattr }, /* setattr */ { &vop_read_desc, adosfs_read }, /* read */ { &vop_write_desc, adosfs_write }, /* write */ { &vop_lease_desc, adosfs_lease_check }, /* lease */ { &vop_fcntl_desc, adosfs_fcntl }, /* fcntl */ { &vop_ioctl_desc, adosfs_ioctl }, /* ioctl */ { &vop_poll_desc, adosfs_poll }, /* poll */ { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ { &vop_revoke_desc, adosfs_revoke }, /* revoke */ { &vop_mmap_desc, adosfs_mmap }, /* mmap */ { &vop_fsync_desc, adosfs_fsync }, /* fsync */ { &vop_seek_desc, adosfs_seek }, /* seek */ { &vop_remove_desc, adosfs_remove }, /* remove */ { &vop_link_desc, adosfs_link }, /* link */ { &vop_rename_desc, adosfs_rename }, /* rename */ { &vop_mkdir_desc, adosfs_mkdir }, /* mkdir */ { &vop_rmdir_desc, adosfs_rmdir }, /* rmdir */ { &vop_symlink_desc, adosfs_symlink }, /* symlink */ { &vop_readdir_desc, adosfs_readdir }, /* readdir */ { &vop_readlink_desc, adosfs_readlink }, /* readlink */ { &vop_abortop_desc, adosfs_abortop }, /* abortop */ { &vop_inactive_desc, adosfs_inactive }, /* inactive */ { &vop_reclaim_desc, adosfs_reclaim }, /* reclaim */ { &vop_lock_desc, genfs_lock }, /* lock */ { &vop_unlock_desc, genfs_unlock }, /* unlock */ { &vop_bmap_desc, adosfs_bmap }, /* bmap */ { &vop_strategy_desc, adosfs_strategy }, /* strategy */ { &vop_print_desc, adosfs_print }, /* print */ { &vop_islocked_desc, genfs_islocked }, /* islocked */ { &vop_pathconf_desc, adosfs_pathconf }, /* pathconf */ { &vop_advlock_desc, adosfs_advlock }, /* advlock */ { &vop_blkatoff_desc, adosfs_blkatoff }, /* blkatoff */ { &vop_valloc_desc, adosfs_valloc }, /* valloc */ { &vop_vfree_desc, adosfs_vfree }, /* vfree */ { &vop_truncate_desc, adosfs_truncate }, /* truncate */ { &vop_update_desc, adosfs_update }, /* update */ { &vop_bwrite_desc, adosfs_bwrite }, /* bwrite */ { &vop_getpages_desc, genfs_getpages }, /* getpages */ { &vop_putpages_desc, genfs_putpages }, /* putpages */ { NULL, NULL } }; const struct vnodeopv_desc adosfs_vnodeop_opv_desc = { &adosfs_vnodeop_p, adosfs_vnodeop_entries }; int adosfs_getattr(v) void *v; { struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct proc *a_p; } */ *sp = v; struct vattr *vap; struct adosfsmount *amp; struct anode *ap; u_long fblks; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif vap = sp->a_vap; ap = VTOA(sp->a_vp); amp = ap->amp; vattr_null(vap); vap->va_uid = ap->uid; vap->va_gid = ap->gid; vap->va_fsid = sp->a_vp->v_mount->mnt_stat.f_fsid.val[0]; vap->va_atime.tv_sec = vap->va_mtime.tv_sec = vap->va_ctime.tv_sec = ap->mtime.days * 24 * 60 * 60 + ap->mtime.mins * 60 + ap->mtime.ticks / 50 + (8 * 365 + 2) * 24 * 60 * 60; vap->va_atime.tv_nsec = vap->va_mtime.tv_nsec = vap->va_ctime.tv_nsec = 0; vap->va_gen = 0; vap->va_flags = 0; vap->va_rdev = NODEV; vap->va_fileid = ap->block; vap->va_type = sp->a_vp->v_type; vap->va_mode = adunixprot(ap->adprot) & amp->mask; if (sp->a_vp->v_type == VDIR) { vap->va_nlink = 1; /* XXX bogus, oh well */ vap->va_bytes = amp->bsize; vap->va_size = amp->bsize; } else { /* * XXX actually we can track this if we were to walk the list * of links if it exists. * XXX for now, just set nlink to 2 if this is a hard link * to a file, or a file with a hard link. */ vap->va_nlink = 1 + (ap->linkto != 0); /* * round up to nearest blocks add number of file list * blocks needed and mutiply by number of bytes per block. */ fblks = howmany(ap->fsize, amp->dbsize); fblks += howmany(fblks, ANODENDATBLKENT(ap)); vap->va_bytes = fblks * amp->dbsize; vap->va_size = ap->fsize; vap->va_blocksize = amp->dbsize; } #ifdef ADOSFS_DIAGNOSTIC printf(" 0)"); #endif return(0); } /* * are things locked??? they need to be to avoid this being * deleted or changed (data block pointer blocks moving about.) */ int adosfs_read(v) void *v; { struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *sp = v; struct vnode *vp = sp->a_vp; struct adosfsmount *amp; struct anode *ap; struct uio *uio; struct buf *bp; daddr_t lbn; int size, diff, error; long n, on; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif error = 0; uio = sp->a_uio; ap = VTOA(sp->a_vp); amp = ap->amp; /* * Return EOF for character devices, EIO for others */ if (sp->a_vp->v_type != VREG) { error = EIO; goto reterr; } if (uio->uio_resid == 0) goto reterr; if (uio->uio_offset < 0) { error = EINVAL; goto reterr; } /* * to expensive to let general algorithm figure out that * we are beyond the file. Do it now. */ if (uio->uio_offset >= ap->fsize) goto reterr; /* * taken from ufs_read() */ if (vp->v_type == VREG && IS_FFS(amp)) { error = 0; while (uio->uio_resid > 0) { void *win; vsize_t bytelen = MIN(ap->fsize - uio->uio_offset, uio->uio_resid); if (bytelen == 0) { break; } win = ubc_alloc(&vp->v_uobj, uio->uio_offset, &bytelen, UBC_READ); error = uiomove(win, bytelen, uio); ubc_release(win, 0); if (error) { break; } } goto out; } do { size = amp->dbsize; lbn = uio->uio_offset / size; on = uio->uio_offset % size; n = MIN(size - on, uio->uio_resid); diff = ap->fsize - uio->uio_offset; /* * check for EOF */ if (diff <= 0) return(0); if (diff < n) n = diff; /* * read ahead could possibly be worth something * but not much as ados makes little attempt to * make things contigous */ error = bread(sp->a_vp, lbn, amp->bsize, NOCRED, &bp); if (error) { brelse(bp); goto reterr; } if (!IS_FFS(amp)) { if (bp->b_resid > 0) error = EIO; /* OFS needs the complete block */ else if (adoswordn(bp, 0) != BPT_DATA) { #ifdef DIAGNOSTIC printf("adosfs: bad primary type blk %" PRId64 "\n", bp->b_blkno / (amp->bsize / DEV_BSIZE)); #endif error = EINVAL; } else if (adoscksum(bp, ap->nwords)) { #ifdef DIAGNOSTIC printf("adosfs: blk %" PRId64 " failed cksum.\n", bp->b_blkno / (amp->bsize / DEV_BSIZE)); #endif error = EINVAL; } } if (error) { brelse(bp); goto reterr; } #ifdef ADOSFS_DIAGNOSTIC printf(" %d+%d-%d+%d", lbn, on, lbn, n); #endif n = MIN(n, size - bp->b_resid); error = uiomove(bp->b_data + on + amp->bsize - amp->dbsize, (int)n, uio); brelse(bp); } while (error == 0 && uio->uio_resid > 0 && n != 0); out: reterr: #ifdef ADOSFS_DIAGNOSTIC printf(" %d)", error); #endif return(error); } int adosfs_write(v) void *v; { #ifdef ADOSFS_DIAGNOSTIC struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *sp = v; advopprint(sp); printf(" EOPNOTSUPP)"); #endif return(EOPNOTSUPP); } /* * Just call the device strategy routine */ int adosfs_strategy(v) void *v; { struct vop_strategy_args /* { struct buf *a_bp; } */ *sp = v; struct buf *bp; struct anode *ap; struct vnode *vp; int error; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif error = 0; bp = sp->a_bp; if (bp->b_vp == NULL) { bp->b_flags |= B_ERROR; biodone(bp); error = EIO; goto reterr; } vp = bp->b_vp; ap = VTOA(vp); if (bp->b_blkno == bp->b_lblkno) { error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); if (error) { bp->b_flags |= B_ERROR; biodone(bp); goto reterr; } } if ((long)bp->b_blkno == -1) { biodone(bp); error = 0; goto reterr; } vp = ap->amp->devvp; bp->b_dev = vp->v_rdev; VOCALL(vp->v_op, VOFFSET(vop_strategy), sp); reterr: #ifdef ADOSFS_DIAGNOSTIC printf(" %d)", error); #endif return(error); } int adosfs_link(v) void *v; { struct vop_link_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } int adosfs_symlink(v) void *v; { struct vop_symlink_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; char *a_target; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } /* * Wait until the vnode has finished changing state. */ int adosfs_bmap(v) void *v; { struct vop_bmap_args /* { struct vnode *a_vp; daddr_t a_bn; struct vnode **a_vpp; daddr_t *a_bnp; int *a_runp; } */ *sp = v; struct anode *ap; struct buf *flbp; long nb, flblk, flblkoff, fcnt; daddr_t *bnp; daddr_t bn; int error; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif ap = VTOA(sp->a_vp); bn = sp->a_bn; bnp = sp->a_bnp; if (sp->a_runp) { *sp->a_runp = 0; } error = 0; if (sp->a_vpp != NULL) *sp->a_vpp = ap->amp->devvp; if (bnp == NULL) goto reterr; if (bn < 0) { error = EFBIG; goto reterr; } if (sp->a_vp->v_type != VREG) { error = EINVAL; goto reterr; } /* * walk the chain of file list blocks until we find * the one that will yield the block pointer we need. */ if (ap->type == AFILE) nb = ap->block; /* pointer to ourself */ else if (ap->type == ALFILE) nb = ap->linkto; /* pointer to real file */ else { error = EINVAL; goto reterr; } flblk = bn / ANODENDATBLKENT(ap); flbp = NULL; /* * check last indirect block cache */ if (flblk < ap->lastlindblk) fcnt = 0; else { flblk -= ap->lastlindblk; fcnt = ap->lastlindblk; nb = ap->lastindblk; } while (flblk >= 0) { if (flbp) brelse(flbp); if (nb == 0) { #ifdef DIAGNOSTIC printf("adosfs: bad file list chain.\n"); #endif error = EINVAL; goto reterr; } error = bread(ap->amp->devvp, nb * ap->amp->bsize / DEV_BSIZE, ap->amp->bsize, NOCRED, &flbp); if (error) { brelse(flbp); goto reterr; } if (adoscksum(flbp, ap->nwords)) { #ifdef DIAGNOSTIC printf("adosfs: blk %ld failed cksum.\n", nb); #endif brelse(flbp); error = EINVAL; goto reterr; } /* * update last indirect block cache */ ap->lastlindblk = fcnt++; ap->lastindblk = nb; nb = adoswordn(flbp, ap->nwords - 2); flblk--; } /* * calculate offset of block number in table. The table starts * at nwords - 51 and goes to offset 6 or less if indicated by the * valid table entries stored at offset ADBI_NBLKTABENT. */ flblkoff = bn % ANODENDATBLKENT(ap); if (flblkoff < adoswordn(flbp, 2 /* ADBI_NBLKTABENT */)) { flblkoff = (ap->nwords - 51) - flblkoff; *bnp = adoswordn(flbp, flblkoff) * ap->amp->bsize / DEV_BSIZE; } else { #ifdef DIAGNOSTIC printf("flblk offset %ld too large in lblk %ld blk %" PRId64 "\n", flblkoff, (long)bn, flbp->b_blkno); #endif error = EINVAL; } brelse(flbp); reterr: #ifdef ADOSFS_DIAGNOSTIC if (error == 0 && bnp) printf(" %lld => %lld", (long long)bn, (long long)*bnp); printf(" %d)\n", error); #endif return(error); } /* * Print out the contents of a adosfs vnode. */ /* ARGSUSED */ int adosfs_print(v) void *v; { #if 0 struct vop_print_args /* { struct vnode *a_vp; } */ *sp = v; #endif return(0); } struct adirent { u_long fileno; u_short reclen; char type; char namlen; char name[32]; /* maxlen of 30 plus 2 NUL's */ }; int adosfs_readdir(v) void *v; { struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; off_t **a_cookies; int *a_ncookies; } */ *sp = v; int error, useri, chainc, hashi, scanned, uavail; struct adirent ad, *adp; struct anode *pap, *ap; struct adosfsmount *amp; struct vnode *vp; struct uio *uio; u_long nextbn; off_t uoff, *cookies = NULL; int ncookies = 0; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif if (sp->a_vp->v_type != VDIR) { error = ENOTDIR; goto reterr; } uio = sp->a_uio; uoff = uio->uio_offset; if (uoff < 0) { error = EINVAL; goto reterr; } pap = VTOA(sp->a_vp); amp = pap->amp; adp = &ad; error = nextbn = hashi = chainc = scanned = 0; uavail = uio->uio_resid / sizeof(ad); useri = uoff / sizeof(ad); /* * if no slots available or offset requested is not on a slot boundry */ if (uavail < 1 || uoff % sizeof(ad)) { error = EINVAL; goto reterr; } if (sp->a_ncookies) { ncookies = 0; cookies = malloc(sizeof (off_t) * uavail, M_TEMP, M_WAITOK); *sp->a_cookies = cookies; } while (uavail) { if (hashi == pap->ntabent) { *sp->a_eofflag = 1; break; } if (pap->tab[hashi] == 0) { hashi++; continue; } if (nextbn == 0) nextbn = pap->tab[hashi]; /* * first determine if we can skip this chain */ if (chainc == 0) { int skip; skip = useri - scanned; if (pap->tabi[hashi] > 0 && pap->tabi[hashi] <= skip) { scanned += pap->tabi[hashi]; hashi++; nextbn = 0; continue; } } /* * now [continue to] walk the chain */ ap = NULL; do { error = VFS_VGET(amp->mp, (ino_t)nextbn, &vp); if (error) goto reterr; ap = VTOA(vp); scanned++; chainc++; nextbn = ap->hashf; /* * check for end of chain. */ if (nextbn == 0) { pap->tabi[hashi] = chainc; hashi++; chainc = 0; } else if (pap->tabi[hashi] <= 0 && -chainc < pap->tabi[hashi]) pap->tabi[hashi] = -chainc; if (useri >= scanned) { vput(vp); ap = NULL; } } while (ap == NULL && nextbn != 0); /* * we left the loop but without a result so do main over. */ if (ap == NULL) continue; /* * Fill in dirent record */ memset(adp, 0, sizeof(struct adirent)); adp->fileno = ap->block; /* * this deserves an function in kern/vfs_subr.c */ switch (ATOV(ap)->v_type) { case VREG: adp->type = DT_REG; break; case VDIR: adp->type = DT_DIR; break; case VLNK: adp->type = DT_LNK; break; default: adp->type = DT_UNKNOWN; break; } adp->reclen = sizeof(struct adirent); adp->namlen = strlen(ap->name); memcpy(adp->name, ap->name, adp->namlen); vput(vp); error = uiomove((caddr_t) adp, sizeof(struct adirent), uio); if (error) break; if (sp->a_ncookies) { *cookies++ = uoff; ncookies++; } uoff += sizeof(struct adirent); useri++; uavail--; } #if doesnt_uiomove_handle_this uio->uio_offset = uoff; #endif reterr: #ifdef ADOSFS_DIAGNOSTIC printf(" %d)", error); #endif if (sp->a_ncookies) { if (error) { free(*sp->a_cookies, M_TEMP); *sp->a_ncookies = 0; *sp->a_cookies = NULL; } else *sp->a_ncookies = ncookies; } return(error); } int adosfs_access(v) void *v; { struct vop_access_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct proc *a_p; } */ *sp = v; struct anode *ap; struct vnode *vp = sp->a_vp; int error; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif ap = VTOA(vp); #ifdef DIAGNOSTIC if (!VOP_ISLOCKED(vp)) { vprint("adosfs_access: not locked", sp->a_vp); panic("adosfs_access: not locked"); } #endif /* * Disallow write attempts unless the file is a socket, * fifo, or a block or character device resident on the * file system. */ if (sp->a_mode & VWRITE) { switch (vp->v_type) { case VDIR: case VLNK: case VREG: return (EROFS); default: break; } } #ifdef QUOTA #endif error = vaccess(sp->a_vp->v_type, adunixprot(ap->adprot) & ap->amp->mask, ap->uid, ap->gid, sp->a_mode, sp->a_cred); #ifdef ADOSFS_DIAGNOSTIC printf(" %d)", error); #endif return(error); } int adosfs_readlink(v) void *v; { struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; } */ *sp = v; struct anode *ap; int error; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif ap = VTOA(sp->a_vp); error = uiomove(ap->slinkto, strlen(ap->slinkto), sp->a_uio); #ifdef ADOSFS_DIAGNOSTIC printf(" %d)", error); #endif return (error); } /*ARGSUSED*/ int adosfs_inactive(v) void *v; { struct vop_inactive_args /* { struct vnode *a_vp; struct proc *a_p; } */ *sp = v; struct vnode *vp = sp->a_vp; struct proc *p = sp->a_p; #ifdef ADOSFS_DIAGNOSTIC advopprint(sp); #endif VOP_UNLOCK(vp, 0); /* XXX this needs to check if file was deleted */ vrecycle(vp, NULL, p); #ifdef ADOSFS_DIAGNOSTIC printf(" 0)"); #endif return(0); } /* * the kernel wants its vnode back. * no lock needed we are being called from vclean() */ int adosfs_reclaim(v) void *v; { struct vop_reclaim_args /* { struct vnode *a_vp; } */ *sp = v; struct vnode *vp; struct anode *ap; #ifdef ADOSFS_DIAGNOSTIC printf("(reclaim 0)"); #endif vp = sp->a_vp; ap = VTOA(vp); LIST_REMOVE(ap, link); cache_purge(vp); if (vp->v_type == VDIR && ap->tab) free(ap->tab, M_ANODE); else if (vp->v_type == VLNK && ap->slinkto) free(ap->slinkto, M_ANODE); pool_put(&adosfs_node_pool, ap); vp->v_data = NULL; return(0); } /* * POSIX pathconf info, grabbed from kern/u fs, probably need to * investigate exactly what each return type means as they are probably * not valid currently */ int adosfs_pathconf(v) void *v; { struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; register_t *a_retval; } */ *sp = v; switch (sp->a_name) { case _PC_LINK_MAX: *sp->a_retval = LINK_MAX; return (0); case _PC_PIPE_BUF: *sp->a_retval = PIPE_BUF; return (0); case _PC_CHOWN_RESTRICTED: *sp->a_retval = 1; return (0); case _PC_VDISABLE: *sp->a_retval = _POSIX_VDISABLE; return (0); case _PC_SYNC_IO: *sp->a_retval = 1; return (0); case _PC_FILESIZEBITS: *sp->a_retval = 32; return (0); default: return (EINVAL); } /* NOTREACHED */ }