/* $OpenBSD: vnd.c,v 1.99 2010/07/01 17:48:33 thib Exp $ */ /* $NetBSD: vnd.c,v 1.26 1996/03/30 23:06:11 christos Exp $ */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * from: Utah $Hdr: vn.c 1.13 94/04/02$ * * @(#)vn.c 8.6 (Berkeley) 4/1/94 */ /* * Vnode disk driver. * * Block/character interface to a vnode. Allows one to treat a file * as a disk (e.g. build a filesystem in it, mount it, etc.). * * NOTE 1: This uses either the VOP_BMAP/VOP_STRATEGY interface to the * vnode or simple VOP_READ/VOP_WRITE. The former is suitable for swapping * as it doesn't distort the local buffer cache. The latter is good for * building disk images as it keeps the cache consistent after the block * device is closed. * * NOTE 2: There is a security issue involved with this driver. * Once mounted all access to the contents of the "mapped" file via * the special file is controlled by the permissions on the special * file, the protection of the mapped file is ignored (effectively, * by using root credentials in all transactions). * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef VNDDEBUG int dovndcluster = 1; int vnddebug = 0x00; #define VDB_FOLLOW 0x01 #define VDB_INIT 0x02 #define VDB_IO 0x04 #define DNPRINTF(f, p...) do { if ((f) & vnddebug) printf(p); } while (0) #else #define DNPRINTF(f, p...) /* nothing */ #endif /* VNDDEBUG */ /* * vndunit is a bit weird. have to reconstitute the dev_t for * DISKUNIT(), but with the minor masked off. */ #define vndunit(x) DISKUNIT(makedev(major(x), minor(x) & 0x7ff)) #define vndsimple(x) (minor(x) & 0x800) /* same as MAKEDISKDEV, preserving the vndsimple() property */ #define VNDLABELDEV(dev) \ makedev(major(dev), DISKMINOR(vndunit(dev), RAW_PART) | \ (vndsimple(dev) ? 0x800 : 0)) struct vndbuf { struct buf vb_buf; struct buf *vb_obp; }; /* * struct vndbuf allocator */ struct pool vndbufpl; #define getvndbuf() pool_get(&vndbufpl, PR_WAITOK) #define putvndbuf(vbp) pool_put(&vndbufpl, vbp); struct vnd_softc { struct device sc_dev; struct disk sc_dk; char sc_file[VNDNLEN]; /* file we're covering */ int sc_flags; /* flags */ size_t sc_size; /* size of vnd in sectors */ size_t sc_secsize; /* sector size in bytes */ size_t sc_nsectors; /* # of sectors per track */ size_t sc_ntracks; /* # of tracks per cylinder */ struct vnode *sc_vp; /* vnode */ struct ucred *sc_cred; /* credentials */ struct buf sc_tab; /* transfer queue */ blf_ctx *sc_keyctx; /* key context */ struct rwlock sc_rwlock; }; /* sc_flags */ #define VNF_ALIVE 0x0001 #define VNF_INITED 0x0002 #define VNF_LABELLING 0x0100 #define VNF_WLABEL 0x0200 #define VNF_HAVELABEL 0x0400 #define VNF_SIMPLE 0x1000 #define VNF_READONLY 0x2000 #define VNDRW(v) ((v)->sc_flags & VNF_READONLY ? FREAD : FREAD|FWRITE) struct vnd_softc *vnd_softc; int numvnd = 0; struct dkdriver vnddkdriver = { vndstrategy }; /* called by main() at boot time */ void vndattach(int); void vndclear(struct vnd_softc *); void vndstart(struct vnd_softc *); int vndsetcred(struct vnd_softc *, struct ucred *); void vndiodone(struct buf *); void vndshutdown(void); int vndgetdisklabel(dev_t, struct vnd_softc *, struct disklabel *, int); void vndencrypt(struct vnd_softc *, caddr_t, size_t, daddr64_t, int); size_t vndbdevsize(struct vnode *, struct proc *); #define vndlock(sc) rw_enter(&sc->sc_rwlock, RW_WRITE|RW_INTR) #define vndunlock(sc) rw_exit_write(&sc->sc_rwlock) void vndencrypt(struct vnd_softc *vnd, caddr_t addr, size_t size, daddr64_t off, int encrypt) { int i, bsize; u_char iv[8]; bsize = dbtob(1); for (i = 0; i < size/bsize; i++) { bzero(iv, sizeof(iv)); bcopy((u_char *)&off, iv, sizeof(off)); blf_ecb_encrypt(vnd->sc_keyctx, iv, sizeof(iv)); if (encrypt) blf_cbc_encrypt(vnd->sc_keyctx, iv, addr, bsize); else blf_cbc_decrypt(vnd->sc_keyctx, iv, addr, bsize); addr += bsize; off++; } } void vndattach(int num) { char *mem; u_long size; int i; if (num <= 0) return; size = num * sizeof(struct vnd_softc); mem = malloc(size, M_DEVBUF, M_NOWAIT | M_ZERO); if (mem == NULL) { printf("WARNING: no memory for vnode disks\n"); return; } vnd_softc = (struct vnd_softc *)mem; for (i = 0; i < num; i++) { rw_init(&vnd_softc[i].sc_rwlock, "vndlock"); } numvnd = num; pool_init(&vndbufpl, sizeof(struct vndbuf), 0, 0, 0, "vndbufpl", NULL); pool_setlowat(&vndbufpl, 16); pool_sethiwat(&vndbufpl, 1024); } int vndopen(dev_t dev, int flags, int mode, struct proc *p) { int unit = vndunit(dev); struct vnd_softc *sc; int error = 0, part, pmask; DNPRINTF(VDB_FOLLOW, "vndopen(%x, %x, %x, %p)\n", dev, flags, mode, p); if (unit >= numvnd) return (ENXIO); sc = &vnd_softc[unit]; if ((error = vndlock(sc)) != 0) return (error); if (!vndsimple(dev) && sc->sc_vp != NULL && (sc->sc_vp->v_type != VREG || sc->sc_keyctx != NULL)) { error = EINVAL; goto bad; } if ((flags & FWRITE) && (sc->sc_flags & VNF_READONLY)) { error = EROFS; goto bad; } if ((sc->sc_flags & VNF_INITED) && (sc->sc_flags & VNF_HAVELABEL) == 0) { sc->sc_flags |= VNF_HAVELABEL; vndgetdisklabel(dev, sc, sc->sc_dk.dk_label, 0); } part = DISKPART(dev); pmask = 1 << part; /* * If any partition is open, all succeeding openings must be of the * same type or read-only. */ if (sc->sc_dk.dk_openmask) { if (((sc->sc_flags & VNF_SIMPLE) != 0) != (vndsimple(dev) != 0) && (flags & FWRITE)) { error = EBUSY; goto bad; } } else if (vndsimple(dev)) sc->sc_flags |= VNF_SIMPLE; else sc->sc_flags &= ~VNF_SIMPLE; /* Check that the partition exists. */ if (part != RAW_PART && ((sc->sc_flags & VNF_HAVELABEL) == 0 || part >= sc->sc_dk.dk_label->d_npartitions || sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) { error = ENXIO; goto bad; } /* Prevent our unit from being unconfigured while open. */ switch (mode) { case S_IFCHR: sc->sc_dk.dk_copenmask |= pmask; break; case S_IFBLK: sc->sc_dk.dk_bopenmask |= pmask; break; } sc->sc_dk.dk_openmask = sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; error = 0; bad: vndunlock(sc); return (error); } /* * Load the label information on the named device */ int vndgetdisklabel(dev_t dev, struct vnd_softc *sc, struct disklabel *lp, int spoofonly) { bzero(lp, sizeof(struct disklabel)); lp->d_secsize = sc->sc_secsize; lp->d_nsectors = sc->sc_nsectors; lp->d_ntracks = sc->sc_ntracks; lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; lp->d_ncylinders = sc->sc_size / lp->d_secpercyl; strncpy(lp->d_typename, "vnd device", sizeof(lp->d_typename)); lp->d_type = DTYPE_VND; strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); DL_SETDSIZE(lp, sc->sc_size); lp->d_flags = 0; lp->d_version = 1; lp->d_magic = DISKMAGIC; lp->d_magic2 = DISKMAGIC; lp->d_checksum = dkcksum(lp); /* Call the generic disklabel extraction routine */ return readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, spoofonly); } int vndclose(dev_t dev, int flags, int mode, struct proc *p) { int unit = vndunit(dev); struct vnd_softc *sc; int error = 0, part; DNPRINTF(VDB_FOLLOW, "vndclose(%x, %x, %x, %p)\n", dev, flags, mode, p); if (unit >= numvnd) return (ENXIO); sc = &vnd_softc[unit]; if ((error = vndlock(sc)) != 0) return (error); part = DISKPART(dev); /* ...that much closer to allowing unconfiguration... */ switch (mode) { case S_IFCHR: sc->sc_dk.dk_copenmask &= ~(1 << part); break; case S_IFBLK: sc->sc_dk.dk_bopenmask &= ~(1 << part); break; } sc->sc_dk.dk_openmask = sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; vndunlock(sc); return (0); } /* * Two methods are used, the traditional buffercache bypassing and the * newer, cache-coherent on unmount, one. * * Former method: * Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY. * Note that this driver can only be used for swapping over NFS on the hp * since nfs_strategy on the vax cannot handle u-areas and page tables. * * Latter method: * Repack the buffer into an uio structure and use VOP_READ/VOP_WRITE to * access the underlying file. */ void vndstrategy(struct buf *bp) { int unit = vndunit(bp->b_dev); struct vnd_softc *vnd = &vnd_softc[unit]; struct vndbuf *nbp; int bsize; off_t bn; caddr_t addr; size_t resid; int sz, flags, error, s; struct iovec aiov; struct uio auio; struct proc *p = curproc; DNPRINTF(VDB_FOLLOW, "vndstrategy(%p): unit %d\n", bp, unit); if ((vnd->sc_flags & VNF_INITED) == 0) { bp->b_error = ENXIO; bp->b_flags |= B_ERROR; s = splbio(); biodone(bp); splx(s); return; } /* Ensure that the requested block is sector aligned. */ if (bp->b_blkno % DL_BLKSPERSEC(vnd->sc_dk.dk_label) != 0) { bp->b_error = EINVAL; bp->b_flags |= B_ERROR; s = splbio(); biodone(bp); splx(s); return; } bn = bp->b_blkno; bp->b_resid = bp->b_bcount; if (bn < 0) { bp->b_error = EINVAL; bp->b_flags |= B_ERROR; s = splbio(); biodone(bp); splx(s); return; } /* If we have a label, do a boundary check. */ if (vnd->sc_flags & VNF_HAVELABEL) { if (bounds_check_with_label(bp, vnd->sc_dk.dk_label, 1) <= 0) { s = splbio(); biodone(bp); splx(s); return; } /* * bounds_check_with_label() changes bp->b_resid, reset it */ bp->b_resid = bp->b_bcount; } if (vnd->sc_flags & VNF_HAVELABEL) sz = howmany(bp->b_bcount, vnd->sc_dk.dk_label->d_secsize); else sz = howmany(bp->b_bcount, DEV_BSIZE); /* No bypassing of buffer cache? */ if (vndsimple(bp->b_dev)) { /* Loop until all queued requests are handled. */ for (;;) { int part = DISKPART(bp->b_dev); daddr64_t off = DL_SECTOBLK(vnd->sc_dk.dk_label, DL_GETPOFFSET(&vnd->sc_dk.dk_label->d_partitions[part])); aiov.iov_base = bp->b_data; auio.uio_resid = aiov.iov_len = bp->b_bcount; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = dbtob((off_t)(bp->b_blkno + off)); auio.uio_segflg = UIO_SYSSPACE; auio.uio_procp = p; vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY, p); if (bp->b_flags & B_READ) { auio.uio_rw = UIO_READ; bp->b_error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); if (vnd->sc_keyctx) vndencrypt(vnd, bp->b_data, bp->b_bcount, bp->b_blkno, 0); } else { if (vnd->sc_keyctx) vndencrypt(vnd, bp->b_data, bp->b_bcount, bp->b_blkno, 1); auio.uio_rw = UIO_WRITE; /* * Upper layer has already checked I/O for * limits, so there is no need to do it again. */ bp->b_error = VOP_WRITE(vnd->sc_vp, &auio, IO_NOLIMIT, vnd->sc_cred); /* Data in buffer cache needs to be in clear */ if (vnd->sc_keyctx) vndencrypt(vnd, bp->b_data, bp->b_bcount, bp->b_blkno, 0); } VOP_UNLOCK(vnd->sc_vp, 0, p); if (bp->b_error) bp->b_flags |= B_ERROR; bp->b_resid = auio.uio_resid; s = splbio(); biodone(bp); splx(s); /* If nothing more is queued, we are done. */ if (!vnd->sc_tab.b_active) return; /* * Dequeue now since lower level strategy * routine might queue using same links. */ s = splbio(); bp = vnd->sc_tab.b_actf; vnd->sc_tab.b_actf = bp->b_actf; vnd->sc_tab.b_active--; splx(s); } } if (vnd->sc_vp->v_type != VREG || vnd->sc_keyctx != NULL) { bp->b_error = EINVAL; bp->b_flags |= B_ERROR; s = splbio(); biodone(bp); splx(s); return; } /* The old-style buffercache bypassing method. */ bn += DL_SECTOBLK(vnd->sc_dk.dk_label, DL_GETPOFFSET(&vnd->sc_dk.dk_label->d_partitions[DISKPART(bp->b_dev)])); bn = dbtob(bn); bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; addr = bp->b_data; flags = bp->b_flags | B_CALL; for (resid = bp->b_resid; resid; resid -= sz) { struct vnode *vp; daddr64_t nbn; int off, nra; nra = 0; vn_lock(vnd->sc_vp, LK_RETRY | LK_EXCLUSIVE, p); error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); VOP_UNLOCK(vnd->sc_vp, 0, p); if (error == 0 && (long)nbn == -1) error = EIO; #ifdef VNDDEBUG if (!dovndcluster) nra = 0; #endif if ((off = bn % bsize) != 0) sz = bsize - off; else sz = (1 + nra) * bsize; if (resid < sz) sz = resid; DNPRINTF(VDB_IO, "vndstrategy: vp %p/%p bn %x/%lld sz %x\n", vnd->sc_vp, vp, bn, nbn, sz); s = splbio(); nbp = getvndbuf(); splx(s); nbp->vb_buf.b_flags = flags; nbp->vb_buf.b_bcount = sz; nbp->vb_buf.b_bufsize = bp->b_bufsize; nbp->vb_buf.b_error = 0; if (vp->v_type == VBLK || vp->v_type == VCHR) nbp->vb_buf.b_dev = vp->v_rdev; else nbp->vb_buf.b_dev = NODEV; nbp->vb_buf.b_data = addr; nbp->vb_buf.b_blkno = nbn + btodb(off); nbp->vb_buf.b_proc = bp->b_proc; nbp->vb_buf.b_iodone = vndiodone; nbp->vb_buf.b_vp = vp; nbp->vb_buf.b_dirtyoff = bp->b_dirtyoff; nbp->vb_buf.b_dirtyend = bp->b_dirtyend; nbp->vb_buf.b_validoff = bp->b_validoff; nbp->vb_buf.b_validend = bp->b_validend; LIST_INIT(&nbp->vb_buf.b_dep); nbp->vb_buf.b_bq = NULL; /* save a reference to the old buffer */ nbp->vb_obp = bp; /* * If there was an error or a hole in the file...punt. * Note that we deal with this after the nbp allocation. * This ensures that we properly clean up any operations * that we have already fired off. * * XXX we could deal with holes here but it would be * a hassle (in the write case). * We must still however charge for the write even if there * was an error. */ if (error) { nbp->vb_buf.b_error = error; nbp->vb_buf.b_flags |= B_ERROR; bp->b_resid -= (resid - sz); s = splbio(); /* charge for the write */ if ((nbp->vb_buf.b_flags & B_READ) == 0) nbp->vb_buf.b_vp->v_numoutput++; biodone(&nbp->vb_buf); splx(s); return; } /* * Just sort by block number */ nbp->vb_buf.b_cylinder = nbp->vb_buf.b_blkno; s = splbio(); disksort(&vnd->sc_tab, &nbp->vb_buf); vnd->sc_tab.b_active++; vndstart(vnd); splx(s); bn += sz; addr += sz; } } /* * Feed requests sequentially. * We do it this way to keep from flooding NFS servers if we are connected * to an NFS file. This places the burden on the client rather than the * server. */ void vndstart(struct vnd_softc *vnd) { struct buf *bp; /* * Dequeue now since lower level strategy routine might * queue using same links */ bp = vnd->sc_tab.b_actf; vnd->sc_tab.b_actf = bp->b_actf; DNPRINTF(VDB_IO, "vndstart(%d): bp %p vp %p blkno %lld addr %p cnt %lx\n", vnd-vnd_softc, bp, bp->b_vp, bp->b_blkno, bp->b_data, bp->b_bcount); /* Instrumentation. */ disk_busy(&vnd->sc_dk); if ((bp->b_flags & B_READ) == 0) bp->b_vp->v_numoutput++; VOP_STRATEGY(bp); } void vndiodone(struct buf *bp) { struct vndbuf *vbp = (struct vndbuf *) bp; struct buf *pbp = vbp->vb_obp; struct vnd_softc *vnd = &vnd_softc[vndunit(pbp->b_dev)]; splassert(IPL_BIO); DNPRINTF(VDB_IO, "vndiodone(%d): vbp %p vp %p blkno %lld addr %p cnt %lx\n", vnd-vnd_softc, vbp, vbp->vb_buf.b_vp, vbp->vb_buf.b_blkno, vbp->vb_buf.b_data, vbp->vb_buf.b_bcount); if (vbp->vb_buf.b_error) { DNPRINTF(VDB_IO, "vndiodone: vbp %p error %d\n", vbp, vbp->vb_buf.b_error); pbp->b_flags |= B_ERROR; /* XXX does this matter here? */ (&vbp->vb_buf)->b_flags |= B_RAW; pbp->b_error = biowait(&vbp->vb_buf); } pbp->b_resid -= vbp->vb_buf.b_bcount; putvndbuf(vbp); if (vnd->sc_tab.b_active) { disk_unbusy(&vnd->sc_dk, (pbp->b_bcount - pbp->b_resid), (pbp->b_flags & B_READ)); if (!vnd->sc_tab.b_actf) vnd->sc_tab.b_active--; } if (pbp->b_resid == 0) { DNPRINTF(VDB_IO, "vndiodone: pbp %p iodone\n", pbp); biodone(pbp); } } /* ARGSUSED */ int vndread(dev_t dev, struct uio *uio, int flags) { int unit = vndunit(dev); struct vnd_softc *sc; DNPRINTF(VDB_FOLLOW, "vndread(%x, %p)\n", dev, uio); if (unit >= numvnd) return (ENXIO); sc = &vnd_softc[unit]; if ((sc->sc_flags & VNF_INITED) == 0) return (ENXIO); return (physio(vndstrategy, NULL, dev, B_READ, minphys, uio)); } /* ARGSUSED */ int vndwrite(dev_t dev, struct uio *uio, int flags) { int unit = vndunit(dev); struct vnd_softc *sc; DNPRINTF(VDB_FOLLOW, "vndwrite(%x, %p)\n", dev, uio); if (unit >= numvnd) return (ENXIO); sc = &vnd_softc[unit]; if ((sc->sc_flags & VNF_INITED) == 0) return (ENXIO); return (physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio)); } size_t vndbdevsize(struct vnode *vp, struct proc *p) { struct partinfo pi; struct bdevsw *bsw; dev_t dev; dev = vp->v_rdev; bsw = bdevsw_lookup(dev); if (bsw->d_ioctl == NULL) return (0); if (bsw->d_ioctl(dev, DIOCGPART, (caddr_t)&pi, FREAD, p)) return (0); DNPRINTF(VDB_INIT, "vndbdevsize: size %li secsize %li\n", (long)pi.part->p_size,(long)pi.disklab->d_secsize); return (pi.part->p_size); } /* ARGSUSED */ int vndioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) { int unit = vndunit(dev); struct disklabel *lp; struct vnd_softc *vnd; struct vnd_ioctl *vio; struct vnd_user *vnu; struct vattr vattr; struct nameidata nd; int error, part, pmask, s; DNPRINTF(VDB_FOLLOW, "vndioctl(%x, %lx, %p, %x, %p): unit %d\n", dev, cmd, addr, flag, p, unit); error = suser(p, 0); if (error) return (error); if (unit >= numvnd) return (ENXIO); vnd = &vnd_softc[unit]; vio = (struct vnd_ioctl *)addr; switch (cmd) { case VNDIOCSET: if (vnd->sc_flags & VNF_INITED) return (EBUSY); if (!(vnd->sc_flags & VNF_SIMPLE) && vio->vnd_keylen) return (EINVAL); if ((error = vndlock(vnd)) != 0) return (error); if ((error = copyinstr(vio->vnd_file, vnd->sc_file, sizeof(vnd->sc_file), NULL))) { vndunlock(vnd); return (error); } bzero(vnd->sc_dev.dv_xname, sizeof(vnd->sc_dev.dv_xname)); if (snprintf(vnd->sc_dev.dv_xname, sizeof(vnd->sc_dev.dv_xname), "vnd%d", unit) >= sizeof(vnd->sc_dev.dv_xname)) { printf("VNDIOCSET: device name too long\n"); vndunlock(vnd); return(ENXIO); } /* Set geometry for device. */ vnd->sc_secsize = vio->vnd_secsize; vnd->sc_ntracks = vio->vnd_ntracks; vnd->sc_nsectors = vio->vnd_nsectors; /* * Open for read and write first. This lets vn_open() weed out * directories, sockets, etc. so we don't have to worry about * them. */ NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vnd_file, p); vnd->sc_flags &= ~VNF_READONLY; error = vn_open(&nd, FREAD|FWRITE, 0); if (error == EROFS) { vnd->sc_flags |= VNF_READONLY; error = vn_open(&nd, FREAD, 0); } if (error) { vndunlock(vnd); return (error); } if (nd.ni_vp->v_type != VREG && !vndsimple(dev)) { VOP_UNLOCK(nd.ni_vp, 0, p); vn_close(nd.ni_vp, VNDRW(vnd), p->p_ucred, p); vndunlock(vnd); return (EINVAL); } if (nd.ni_vp->v_type == VBLK) vnd->sc_size = vndbdevsize(nd.ni_vp, p); else { error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p); if (error) { VOP_UNLOCK(nd.ni_vp, 0, p); vn_close(nd.ni_vp, VNDRW(vnd), p->p_ucred, p); vndunlock(vnd); return (error); } vnd->sc_size = vattr.va_size / vnd->sc_secsize; } VOP_UNLOCK(nd.ni_vp, 0, p); vnd->sc_vp = nd.ni_vp; if ((error = vndsetcred(vnd, p->p_ucred)) != 0) { (void) vn_close(nd.ni_vp, VNDRW(vnd), p->p_ucred, p); vndunlock(vnd); return (error); } if (vio->vnd_keylen > 0) { char key[BLF_MAXUTILIZED]; if (vio->vnd_keylen > sizeof(key)) vio->vnd_keylen = sizeof(key); if ((error = copyin(vio->vnd_key, key, vio->vnd_keylen)) != 0) { (void) vn_close(nd.ni_vp, VNDRW(vnd), p->p_ucred, p); vndunlock(vnd); return (error); } vnd->sc_keyctx = malloc(sizeof(*vnd->sc_keyctx), M_DEVBUF, M_WAITOK); blf_key(vnd->sc_keyctx, key, vio->vnd_keylen); bzero(key, vio->vnd_keylen); } else vnd->sc_keyctx = NULL; vio->vnd_size = vnd->sc_size * vnd->sc_secsize; vnd->sc_flags |= VNF_INITED; DNPRINTF(VDB_INIT, "vndioctl: SET vp %p size %llx\n", vnd->sc_vp, (unsigned long long)vnd->sc_size); /* Attach the disk. */ vnd->sc_dk.dk_driver = &vnddkdriver; vnd->sc_dk.dk_name = vnd->sc_dev.dv_xname; disk_attach(&vnd->sc_dk); vndunlock(vnd); break; case VNDIOCCLR: if ((vnd->sc_flags & VNF_INITED) == 0) return (ENXIO); if ((error = vndlock(vnd)) != 0) return (error); /* * Don't unconfigure if any other partitions are open * or if both the character and block flavors of this * partition are open. */ part = DISKPART(dev); pmask = (1 << part); if ((vnd->sc_dk.dk_openmask & ~pmask) || ((vnd->sc_dk.dk_bopenmask & pmask) && (vnd->sc_dk.dk_copenmask & pmask))) { vndunlock(vnd); return (EBUSY); } vndclear(vnd); DNPRINTF(VDB_INIT, "vndioctl: CLRed\n"); /* Free crypto key */ if (vnd->sc_keyctx) { bzero(vnd->sc_keyctx, sizeof(*vnd->sc_keyctx)); free(vnd->sc_keyctx, M_DEVBUF); } /* Detach the disk. */ disk_detach(&vnd->sc_dk); /* This must be atomic. */ s = splhigh(); vndunlock(vnd); bzero(vnd, sizeof(struct vnd_softc)); splx(s); break; case VNDIOCGET: vnu = (struct vnd_user *)addr; if (vnu->vnu_unit == -1) vnu->vnu_unit = unit; if (vnu->vnu_unit >= numvnd) return (ENXIO); if (vnu->vnu_unit < 0) return (EINVAL); vnd = &vnd_softc[vnu->vnu_unit]; if (vnd->sc_flags & VNF_INITED) { error = VOP_GETATTR(vnd->sc_vp, &vattr, p->p_ucred, p); if (error) return (error); strlcpy(vnu->vnu_file, vnd->sc_file, sizeof(vnu->vnu_file)); vnu->vnu_dev = vattr.va_fsid; vnu->vnu_ino = vattr.va_fileid; } else { vnu->vnu_dev = 0; vnu->vnu_ino = 0; } break; case DIOCRLDINFO: if ((vnd->sc_flags & VNF_HAVELABEL) == 0) return (ENOTTY); lp = malloc(sizeof(*lp), M_TEMP, M_WAITOK); vndgetdisklabel(dev, vnd, lp, 0); *(vnd->sc_dk.dk_label) = *lp; free(lp, M_TEMP); return (0); case DIOCGPDINFO: if ((vnd->sc_flags & VNF_HAVELABEL) == 0) return (ENOTTY); vndgetdisklabel(dev, vnd, (struct disklabel *)addr, 1); return (0); case DIOCGDINFO: if ((vnd->sc_flags & VNF_HAVELABEL) == 0) return (ENOTTY); *(struct disklabel *)addr = *(vnd->sc_dk.dk_label); return (0); case DIOCGPART: if ((vnd->sc_flags & VNF_HAVELABEL) == 0) return (ENOTTY); ((struct partinfo *)addr)->disklab = vnd->sc_dk.dk_label; ((struct partinfo *)addr)->part = &vnd->sc_dk.dk_label->d_partitions[DISKPART(dev)]; return (0); case DIOCWDINFO: case DIOCSDINFO: if ((vnd->sc_flags & VNF_HAVELABEL) == 0) return (ENOTTY); if ((flag & FWRITE) == 0) return (EBADF); if ((error = vndlock(vnd)) != 0) return (error); vnd->sc_flags |= VNF_LABELLING; error = setdisklabel(vnd->sc_dk.dk_label, (struct disklabel *)addr, /*vnd->sc_dk.dk_openmask : */0); if (error == 0) { if (cmd == DIOCWDINFO) error = writedisklabel(VNDLABELDEV(dev), vndstrategy, vnd->sc_dk.dk_label); } vnd->sc_flags &= ~VNF_LABELLING; vndunlock(vnd); return (error); case DIOCWLABEL: if ((flag & FWRITE) == 0) return (EBADF); if (*(int *)addr) vnd->sc_flags |= VNF_WLABEL; else vnd->sc_flags &= ~VNF_WLABEL; return (0); default: return (ENOTTY); } return (0); } /* * Duplicate the current processes' credentials. Since we are called only * as the result of a SET ioctl and only root can do that, any future access * to this "disk" is essentially as root. Note that credentials may change * if some other uid can write directly to the mapped file (NFS). */ int vndsetcred(struct vnd_softc *vnd, struct ucred *cred) { struct uio auio; struct iovec aiov; char *tmpbuf; int error; struct proc *p = curproc; vnd->sc_cred = crdup(cred); tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); /* XXX: Horrible kludge to establish credentials for NFS */ aiov.iov_base = tmpbuf; aiov.iov_len = MIN(DEV_BSIZE, vnd->sc_size * vnd->sc_secsize); auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_SYSSPACE; auio.uio_resid = aiov.iov_len; vn_lock(vnd->sc_vp, LK_RETRY | LK_EXCLUSIVE, p); error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); VOP_UNLOCK(vnd->sc_vp, 0, p); free(tmpbuf, M_TEMP); return (error); } void vndshutdown(void) { struct vnd_softc *vnd; for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) if (vnd->sc_flags & VNF_INITED) vndclear(vnd); } void vndclear(struct vnd_softc *vnd) { struct vnode *vp = vnd->sc_vp; struct proc *p = curproc; /* XXX */ DNPRINTF(VDB_FOLLOW, "vndclear(%p): vp %p\n", vnd, vp); vnd->sc_flags &= ~VNF_INITED; if (vp == NULL) panic("vndioctl: null vp"); (void) vn_close(vp, VNDRW(vnd), vnd->sc_cred, p); crfree(vnd->sc_cred); vnd->sc_vp = NULL; vnd->sc_cred = NULL; vnd->sc_size = 0; } daddr64_t vndsize(dev_t dev) { int unit = vndunit(dev); struct vnd_softc *vnd = &vnd_softc[unit]; if (unit >= numvnd || (vnd->sc_flags & VNF_INITED) == 0) return (-1); return (vnd->sc_size * (vnd->sc_secsize / DEV_BSIZE)); } int vnddump(dev_t dev, daddr64_t blkno, caddr_t va, size_t size) { /* Not implemented. */ return (ENXIO); }