/* $OpenBSD: ccd.c,v 1.78 2007/06/20 18:15:46 deraadt Exp $ */ /* $NetBSD: ccd.c,v 1.33 1996/05/05 04:21:14 thorpej Exp $ */ /*- * Copyright (c) 1996 The NetBSD Foundation, Inc. * Copyright (c) 1997 Niklas Hallqvist. * Copyright (c) 2005 Michael Shalayeff. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * 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 the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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. */ /* * 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 $Hdr: cd.c 1.6 90/11/28$ * * @(#)cd.c 8.2 (Berkeley) 11/16/93 */ /* * "Concatenated" disk driver. * * Dynamic configuration and disklabel support by: * Jason R. Thorpe * Numerical Aerodynamic Simulation Facility * Mail Stop 258-6 * NASA Ames Research Center * Moffett Field, CA 94035 * * Mirroring support based on code written by Satoshi Asami * and Nisha Talagala. */ /* #define CCDDEBUG */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __GNUC__ #define INLINE static __inline #else #define INLINE #endif /* * A concatenated disk is described after initialization by this structure. */ struct ccd_softc { struct disk sc_dkdev; /* generic disk device info */ struct ccdgeom sc_geom; /* pseudo geometry info */ struct ccdcinfo *sc_cinfo; /* component info */ struct ccdiinfo *sc_itable; /* interleave table */ char sc_xname[8]; /* XXX external name */ size_t sc_size; /* size of ccd */ int sc_flags; /* flags */ int sc_cflags; /* copy of ccd_flags */ int sc_ileave; /* interleave */ u_int sc_nccdisks; /* # of components */ u_int sc_nccunits; /* # of components for data */ struct rwlock sc_rwlock; /* lock */ }; /* sc_flags */ #define CCDF_INITED 0x01 /* unit has been initialized */ #define CCDF_WLABEL 0x02 /* label area is writable */ #define CCDF_LABELLING 0x04 /* unit is currently being labelled */ #ifdef CCDDEBUG #define CCD_DCALL(m,c) if (ccddebug & (m)) c #define CCD_DPRINTF(m,a) CCD_DCALL(m, printf a) #define CCDB_FOLLOW 0x01 #define CCDB_INIT 0x02 #define CCDB_IO 0x04 #define CCDB_LABEL 0x08 #define CCDB_VNODE 0x10 int ccddebug = 0x00; #else #define CCD_DCALL(m,c) /* m, c */ #define CCD_DPRINTF(m,a) /* m, a */ #endif struct ccdbuf { struct buf cb_buf; /* new I/O buf */ struct buf *cb_obp; /* ptr. to original I/O buf */ struct ccd_softc*cb_sc; /* point back to the device */ struct ccdbuf *cb_dep; /* mutual ptrs for mirror part */ int cb_comp; /* target component */ int cb_flags; /* misc. flags */ #define CBF_MIRROR 0x01 /* we're for a mirror component */ #define CBF_DONE 0x02 /* this buffer is done */ }; /* called by main() at boot time */ void ccdattach(int); /* called by biodone() at interrupt time */ void ccdiodone(struct buf *); daddr64_t ccdsize(dev_t); void ccdstart(struct ccd_softc *, struct buf *); void ccdinterleave(struct ccd_softc *); void ccdintr(struct ccd_softc *, struct buf *); int ccdinit(struct ccddevice *, char **, struct proc *); int ccdlookup(char *, struct proc *p, struct vnode **); long ccdbuffer(struct ccd_softc *, struct buf *, daddr64_t, caddr_t, long, struct ccdbuf **); void ccdgetdisklabel(dev_t, struct ccd_softc *, struct disklabel *, int); INLINE struct ccdbuf *getccdbuf(void); INLINE void putccdbuf(struct ccdbuf *); #define ccdlock(sc) rw_enter(&sc->sc_rwlock, RW_WRITE|RW_INTR) #define ccdunlock(sc) rw_exit_write(&sc->sc_rwlock) #ifdef CCDDEBUG void printiinfo(struct ccdiinfo *); #endif /* Non-private for the benefit of libkvm. */ struct ccd_softc *ccd_softc; struct ccddevice *ccddevs; int numccd = 0; /* * struct ccdbuf allocator */ struct pool ccdbufpl; /* * Manage the ccd buffer structures. */ INLINE struct ccdbuf * getccdbuf(void) { struct ccdbuf *cbp; if ((cbp = pool_get(&ccdbufpl, PR_WAITOK))) bzero(cbp, sizeof(struct ccdbuf)); return (cbp); } INLINE void putccdbuf(struct ccdbuf *cbp) { pool_put(&ccdbufpl, cbp); } /* * Called by main() during pseudo-device attachment. All we need * to do is allocate enough space for devices to be configured later. */ void ccdattach(int num) { int i; if (num <= 0) { #ifdef DIAGNOSTIC panic("ccdattach: count <= 0"); #endif return; } ccd_softc = (struct ccd_softc *)malloc(num * sizeof(struct ccd_softc), M_DEVBUF, M_NOWAIT); ccddevs = (struct ccddevice *)malloc(num * sizeof(struct ccddevice), M_DEVBUF, M_NOWAIT); if ((ccd_softc == NULL) || (ccddevs == NULL)) { printf("WARNING: no memory for concatenated disks\n"); if (ccd_softc != NULL) free(ccd_softc, M_DEVBUF); if (ccddevs != NULL) free(ccddevs, M_DEVBUF); return; } for (i = 0; i < num; i++) { rw_init(&ccd_softc[i].sc_rwlock, "ccdlock"); } numccd = num; bzero(ccd_softc, num * sizeof(struct ccd_softc)); bzero(ccddevs, num * sizeof(struct ccddevice)); pool_init(&ccdbufpl, sizeof(struct ccdbuf), 0, 0, 0, "ccdbufpl", NULL); pool_setlowat(&ccdbufpl, 16); pool_sethiwat(&ccdbufpl, 1024); } int ccdinit(struct ccddevice *ccd, char **cpaths, struct proc *p) { struct ccd_softc *cs = &ccd_softc[ccd->ccd_unit]; struct ccdcinfo *ci = NULL; daddr64_t size; int ix, rpm; struct vnode *vp; struct vattr va; size_t minsize; int maxsecsize; struct partinfo dpart; struct ccdgeom *ccg = &cs->sc_geom; char tmppath[MAXPATHLEN]; int error; CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("ccdinit: unit %d cflags %b\n", ccd->ccd_unit, ccd->ccd_flags, CCDF_BITS)); cs->sc_size = 0; cs->sc_ileave = ccd->ccd_interleave; cs->sc_nccdisks = ccd->ccd_ndev; if (snprintf(cs->sc_xname, sizeof(cs->sc_xname), "ccd%d", ccd->ccd_unit) >= sizeof(cs->sc_xname)) { printf("ccdinit: device name too long.\n"); return(ENXIO); } /* Allocate space for the component info. */ cs->sc_cinfo = malloc(cs->sc_nccdisks * sizeof(struct ccdcinfo), M_DEVBUF, M_WAITOK); bzero(cs->sc_cinfo, cs->sc_nccdisks * sizeof(struct ccdcinfo)); /* * Verify that each component piece exists and record * relevant information about it. */ maxsecsize = 0; minsize = 0; rpm = 0; for (ix = 0; ix < cs->sc_nccdisks; ix++) { vp = ccd->ccd_vpp[ix]; ci = &cs->sc_cinfo[ix]; ci->ci_vp = vp; /* * Copy in the pathname of the component. */ bzero(tmppath, sizeof(tmppath)); /* sanity */ error = copyinstr(cpaths[ix], tmppath, MAXPATHLEN, &ci->ci_pathlen); if (error) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: can't copy path, error = %d\n", cs->sc_xname, error)); free(cs->sc_cinfo, M_DEVBUF); return (error); } ci->ci_path = malloc(ci->ci_pathlen, M_DEVBUF, M_WAITOK); bcopy(tmppath, ci->ci_path, ci->ci_pathlen); /* * XXX: Cache the component's dev_t. */ if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: %s: getattr failed error = %d\n", cs->sc_xname, ci->ci_path, error)); free(ci->ci_path, M_DEVBUF); free(cs->sc_cinfo, M_DEVBUF); return (error); } ci->ci_dev = va.va_rdev; /* * Get partition information for the component. */ error = VOP_IOCTL(vp, DIOCGPART, (caddr_t)&dpart, FREAD, p->p_ucred, p); if (error) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: %s: ioctl failed, error = %d\n", cs->sc_xname, ci->ci_path, error)); free(ci->ci_path, M_DEVBUF); free(cs->sc_cinfo, M_DEVBUF); return (error); } if (dpart.part->p_fstype == FS_CCD || dpart.part->p_fstype == FS_BSDFFS) { maxsecsize = ((dpart.disklab->d_secsize > maxsecsize) ? dpart.disklab->d_secsize : maxsecsize); size = DL_GETPSIZE(dpart.part); } else { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: %s: incorrect partition type\n", cs->sc_xname, ci->ci_path)); free(ci->ci_path, M_DEVBUF); free(cs->sc_cinfo, M_DEVBUF); return (EFTYPE); } /* * Calculate the size, truncating to an interleave * boundary if necessary. */ if (cs->sc_ileave > 1) size -= size % cs->sc_ileave; if (size == 0) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: %s: size == 0\n", cs->sc_xname, ci->ci_path)); free(ci->ci_path, M_DEVBUF); free(cs->sc_cinfo, M_DEVBUF); return (ENODEV); } if (minsize == 0 || size < minsize) minsize = size; ci->ci_size = size; cs->sc_size += size; rpm += dpart.disklab->d_rpm; } ccg->ccg_rpm = rpm / cs->sc_nccdisks; /* * Don't allow the interleave to be smaller than * the biggest component sector. */ if ((cs->sc_ileave > 0) && (cs->sc_ileave < (maxsecsize / DEV_BSIZE))) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: interleave must be at least %d\n", cs->sc_xname, (maxsecsize / DEV_BSIZE))); free(ci->ci_path, M_DEVBUF); free(cs->sc_cinfo, M_DEVBUF); return (EINVAL); } /* * Mirroring support requires uniform interleave and * and even number of components. */ if (ccd->ccd_flags & CCDF_MIRROR) { ccd->ccd_flags |= CCDF_UNIFORM; if (cs->sc_ileave == 0) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: mirroring requires interleave\n", cs->sc_xname)); free(ci->ci_path, M_DEVBUF); free(cs->sc_cinfo, M_DEVBUF); return (EINVAL); } if (cs->sc_nccdisks % 2) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("%s: mirroring requires even # of components\n", cs->sc_xname)); free(ci->ci_path, M_DEVBUF); free(cs->sc_cinfo, M_DEVBUF); return (EINVAL); } } /* * If uniform interleave is desired set all sizes to that of * the smallest component. */ ccg->ccg_ntracks = cs->sc_nccunits = cs->sc_nccdisks; if (ccd->ccd_flags & CCDF_UNIFORM) { for (ci = cs->sc_cinfo; ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) ci->ci_size = minsize; if (ccd->ccd_flags & CCDF_MIRROR) cs->sc_nccunits = ccg->ccg_ntracks /= 2; cs->sc_size = ccg->ccg_ntracks * minsize; } cs->sc_cflags = ccd->ccd_flags; /* So we can find out later... */ /* * Construct the interleave table. */ ccdinterleave(cs); /* * Create pseudo-geometry based on 1MB cylinders. It's * pretty close. */ ccg->ccg_secsize = DEV_BSIZE; ccg->ccg_nsectors = cs->sc_ileave? cs->sc_ileave : 1024 * (1024 / ccg->ccg_secsize); ccg->ccg_ncylinders = cs->sc_size / ccg->ccg_ntracks / ccg->ccg_nsectors; cs->sc_flags |= CCDF_INITED; return (0); } void ccdinterleave(struct ccd_softc *cs) { struct ccdcinfo *ci, *smallci; struct ccdiinfo *ii; daddr64_t bn, lbn; int ix; u_long size; CCD_DPRINTF(CCDB_INIT, ("ccdinterleave(%p): ileave %d\n", cs, cs->sc_ileave)); /* * Allocate an interleave table. * Chances are this is too big, but we don't care. */ size = (cs->sc_nccdisks + 1) * sizeof(struct ccdiinfo); cs->sc_itable = (struct ccdiinfo *)malloc(size, M_DEVBUF, M_WAITOK); bzero((caddr_t)cs->sc_itable, size); /* * Trivial case: no interleave (actually interleave of disk size). * Each table entry represents a single component in its entirety. */ if (cs->sc_ileave == 0) { bn = 0; ii = cs->sc_itable; for (ix = 0; ix < cs->sc_nccdisks; ix++) { /* Allocate space for ii_index. */ ii->ii_index = malloc(sizeof(int), M_DEVBUF, M_WAITOK); ii->ii_ndisk = 1; ii->ii_startblk = bn; ii->ii_startoff = 0; ii->ii_index[0] = ix; bn += cs->sc_cinfo[ix].ci_size; ii++; } ii->ii_ndisk = 0; CCD_DCALL(CCDB_INIT, printiinfo(cs->sc_itable)); return; } /* * The following isn't fast or pretty; it doesn't have to be. */ size = 0; bn = lbn = 0; for (ii = cs->sc_itable; ; ii++) { /* Allocate space for ii_index. */ ii->ii_index = malloc((sizeof(int) * cs->sc_nccdisks), M_DEVBUF, M_WAITOK); /* * Locate the smallest of the remaining components */ smallci = NULL; for (ci = cs->sc_cinfo; ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) if (ci->ci_size > size && (smallci == NULL || ci->ci_size < smallci->ci_size)) smallci = ci; /* * Nobody left, all done */ if (smallci == NULL) { ii->ii_ndisk = 0; break; } /* * Record starting logical block and component offset */ ii->ii_startblk = bn / cs->sc_ileave; ii->ii_startoff = lbn; /* * Determine how many disks take part in this interleave * and record their indices. */ ix = 0; for (ci = cs->sc_cinfo; ci < &cs->sc_cinfo[cs->sc_nccunits]; ci++) if (ci->ci_size >= smallci->ci_size) ii->ii_index[ix++] = ci - cs->sc_cinfo; ii->ii_ndisk = ix; bn += ix * (smallci->ci_size - size); lbn = smallci->ci_size / cs->sc_ileave; size = smallci->ci_size; } CCD_DCALL(CCDB_INIT, printiinfo(cs->sc_itable)); } /* ARGSUSED */ int ccdopen(dev_t dev, int flags, int fmt, struct proc *p) { int unit = DISKUNIT(dev); struct ccd_softc *cs; struct disklabel *lp; int error = 0, part, pmask; CCD_DPRINTF(CCDB_FOLLOW, ("ccdopen(%x, %x)\n", dev, flags)); if (unit >= numccd) return (ENXIO); cs = &ccd_softc[unit]; if ((error = ccdlock(cs)) != 0) return (error); lp = cs->sc_dkdev.dk_label; part = DISKPART(dev); pmask = (1 << part); /* * If we're initialized, check to see if there are any other * open partitions. If not, then it's safe to update * the in-core disklabel. */ if ((cs->sc_flags & CCDF_INITED) && (cs->sc_dkdev.dk_openmask == 0)) ccdgetdisklabel(dev, cs, lp, 0); /* Check that the partition exists. */ if (part != RAW_PART) { if (((cs->sc_flags & CCDF_INITED) == 0) || ((part >= lp->d_npartitions) || (lp->d_partitions[part].p_fstype == FS_UNUSED))) { error = ENXIO; goto done; } } /* Prevent our unit from being unconfigured while open. */ switch (fmt) { case S_IFCHR: cs->sc_dkdev.dk_copenmask |= pmask; break; case S_IFBLK: cs->sc_dkdev.dk_bopenmask |= pmask; break; } cs->sc_dkdev.dk_openmask = cs->sc_dkdev.dk_copenmask | cs->sc_dkdev.dk_bopenmask; done: ccdunlock(cs); return (error); } /* ARGSUSED */ int ccdclose(dev_t dev, int flags, int fmt, struct proc *p) { int unit = DISKUNIT(dev); struct ccd_softc *cs; int error = 0, part; CCD_DPRINTF(CCDB_FOLLOW, ("ccdclose(%x, %x)\n", dev, flags)); if (unit >= numccd) return (ENXIO); cs = &ccd_softc[unit]; if ((error = ccdlock(cs)) != 0) return (error); part = DISKPART(dev); /* ...that much closer to allowing unconfiguration... */ switch (fmt) { case S_IFCHR: cs->sc_dkdev.dk_copenmask &= ~(1 << part); break; case S_IFBLK: cs->sc_dkdev.dk_bopenmask &= ~(1 << part); break; } cs->sc_dkdev.dk_openmask = cs->sc_dkdev.dk_copenmask | cs->sc_dkdev.dk_bopenmask; ccdunlock(cs); return (0); } void ccdstrategy(struct buf *bp) { int unit = DISKUNIT(bp->b_dev); struct ccd_softc *cs = &ccd_softc[unit]; int s; int wlabel; struct disklabel *lp; CCD_DPRINTF(CCDB_FOLLOW, ("ccdstrategy(%p): unit %d\n", bp, unit)); if ((cs->sc_flags & CCDF_INITED) == 0) { bp->b_error = ENXIO; bp->b_resid = bp->b_bcount; bp->b_flags |= B_ERROR; goto done; } /* If it's a nil transfer, wake up the top half now. */ if (bp->b_bcount == 0) goto done; lp = cs->sc_dkdev.dk_label; /* * Do bounds checking and adjust transfer. If there's an * error, the bounds check will flag that for us. */ wlabel = cs->sc_flags & (CCDF_WLABEL|CCDF_LABELLING); if (DISKPART(bp->b_dev) != RAW_PART && bounds_check_with_label(bp, lp, wlabel) <= 0) goto done; bp->b_resid = bp->b_bcount; /* * "Start" the unit. */ s = splbio(); ccdstart(cs, bp); splx(s); return; done: s = splbio(); biodone(bp); splx(s); } void ccdstart(struct ccd_softc *cs, struct buf *bp) { long bcount, rcount; struct ccdbuf **cbpp; caddr_t addr; daddr64_t bn; struct partition *pp; CCD_DPRINTF(CCDB_FOLLOW, ("ccdstart(%p, %p, %s)\n", cs, bp, bp->b_flags & B_READ? "read" : "write")); /* Instrumentation. */ disk_busy(&cs->sc_dkdev); /* * Translate the partition-relative block number to an absolute. */ bn = bp->b_blkno; pp = &cs->sc_dkdev.dk_label->d_partitions[DISKPART(bp->b_dev)]; bn += DL_GETPOFFSET(pp); /* * Allocate component buffers */ cbpp = malloc(2 * cs->sc_nccdisks * sizeof(struct ccdbuf *), M_DEVBUF, M_WAITOK); bzero(cbpp, 2 * cs->sc_nccdisks * sizeof(struct ccdbuf *)); addr = bp->b_data; for (bcount = bp->b_bcount; bcount > 0; bcount -= rcount) { rcount = ccdbuffer(cs, bp, bn, addr, bcount, cbpp); /* * This is the old, slower, but less restrictive, mode of * operation. It allows interleaves which are not multiples * of PAGE_SIZE and mirroring. */ if ((cbpp[0]->cb_buf.b_flags & B_READ) == 0) cbpp[0]->cb_buf.b_vp->v_numoutput++; VOP_STRATEGY(&cbpp[0]->cb_buf); if ((cs->sc_cflags & CCDF_MIRROR) && ((cbpp[0]->cb_buf.b_flags & B_READ) == 0)) { cbpp[1]->cb_buf.b_vp->v_numoutput++; VOP_STRATEGY(&cbpp[1]->cb_buf); } bn += btodb(rcount); addr += rcount; } free(cbpp, M_DEVBUF); } /* * Build a component buffer header. */ long ccdbuffer(struct ccd_softc *cs, struct buf *bp, daddr64_t bn, caddr_t addr, long bcount, struct ccdbuf **cbpp) { struct ccdcinfo *ci, *ci2 = NULL; struct ccdbuf *cbp; daddr64_t cbn, cboff, sblk; int ccdisk, ccdisk2, off; long cnt; struct ccdiinfo *ii; struct buf *nbp; CCD_DPRINTF(CCDB_IO, ("ccdbuffer(%p, %p, %d, %p, %ld, %p)\n", cs, bp, bn, addr, bcount, cbpp)); /* * Determine which component bn falls in. */ cbn = bn; cboff = 0; if (cs->sc_ileave == 0) { /* * Serially concatenated */ sblk = 0; for (ccdisk = 0, ci = &cs->sc_cinfo[ccdisk]; cbn >= sblk + ci->ci_size; ccdisk++, ci = &cs->sc_cinfo[ccdisk]) sblk += ci->ci_size; cbn -= sblk; } else { /* * Interleaved */ cboff = cbn % cs->sc_ileave; cbn /= cs->sc_ileave; for (ii = cs->sc_itable; ii->ii_ndisk; ii++) if (ii->ii_startblk > cbn) break; ii--; off = cbn - ii->ii_startblk; if (ii->ii_ndisk == 1) { ccdisk = ii->ii_index[0]; cbn = ii->ii_startoff + off; } else { ccdisk = ii->ii_index[off % ii->ii_ndisk]; cbn = ii->ii_startoff + off / ii->ii_ndisk; } if (cs->sc_cflags & CCDF_MIRROR) { /* Mirrored data */ ccdisk2 = ccdisk + ii->ii_ndisk; ci2 = &cs->sc_cinfo[ccdisk2]; /* spread the read over both parts */ if (bp->b_flags & B_READ && bcount > bp->b_bcount / 2 && (!(ci2->ci_flags & CCIF_FAILED) || ci->ci_flags & CCIF_FAILED)) ccdisk = ccdisk2; } cbn *= cs->sc_ileave; ci = &cs->sc_cinfo[ccdisk]; CCD_DPRINTF(CCDB_IO, ("ccdisk %d cbn %d ci %p ci2 %p\n", ccdisk, cbn, ci, ci2)); } /* Limit the operation at next component border */ if (cs->sc_ileave == 0) cnt = dbtob(ci->ci_size - cbn); else cnt = dbtob(cs->sc_ileave - cboff); if (cnt < bcount) bcount = cnt; /* * Setup new component buffer. */ cbp = cbpp[0] = getccdbuf(); cbp->cb_flags = 0; nbp = &cbp->cb_buf; nbp->b_flags = bp->b_flags | B_CALL; nbp->b_iodone = ccdiodone; nbp->b_proc = bp->b_proc; nbp->b_dev = ci->ci_dev; /* XXX */ nbp->b_blkno = cbn + cboff; nbp->b_vp = ci->ci_vp; nbp->b_bcount = bcount; LIST_INIT(&nbp->b_dep); nbp->b_data = addr; /* * context for ccdiodone */ cbp->cb_obp = bp; cbp->cb_sc = cs; cbp->cb_comp = ccdisk; /* * Mirrors have an additional write operation that is nearly * identical to the first. */ if ((cs->sc_cflags & CCDF_MIRROR) && !(ci2->ci_flags & CCIF_FAILED) && ((cbp->cb_buf.b_flags & B_READ) == 0)) { struct ccdbuf *cbp2; cbpp[1] = cbp2 = getccdbuf(); *cbp2 = *cbp; cbp2->cb_flags = CBF_MIRROR; cbp2->cb_buf.b_dev = ci2->ci_dev; /* XXX */ cbp2->cb_buf.b_vp = ci2->ci_vp; LIST_INIT(&cbp2->cb_buf.b_dep); cbp2->cb_comp = ccdisk2; cbp2->cb_dep = cbp; cbp->cb_dep = cbp2; } CCD_DPRINTF(CCDB_IO, (" dev %x(u%d): cbp %p bn %d addr %p bcnt %ld\n", ci->ci_dev, ci-cs->sc_cinfo, cbp, bp->b_blkno, bp->b_data, bp->b_bcount)); return (bcount); } void ccdintr(struct ccd_softc *cs, struct buf *bp) { splassert(IPL_BIO); CCD_DPRINTF(CCDB_FOLLOW, ("ccdintr(%p, %p)\n", cs, bp)); /* * Request is done for better or worse, wakeup the top half. */ if (bp->b_flags & B_ERROR) bp->b_resid = bp->b_bcount; disk_unbusy(&cs->sc_dkdev, (bp->b_bcount - bp->b_resid), (bp->b_flags & B_READ)); biodone(bp); } /* * Called at interrupt time. * Mark the component as done and if all components are done, * take a ccd interrupt. */ void ccdiodone(struct buf *vbp) { struct ccdbuf *cbp = (struct ccdbuf *)vbp; struct buf *bp = cbp->cb_obp; struct ccd_softc *cs = cbp->cb_sc; long count = bp->b_bcount; char *comptype; splassert(IPL_BIO); CCD_DPRINTF(CCDB_FOLLOW, ("ccdiodone(%p)\n", cbp)); CCD_DPRINTF(CCDB_IO, (cbp->cb_flags & CBF_MIRROR? "ccdiodone: mirror component\n" : "ccdiodone: bp %p bcount %ld resid %ld\n", bp, bp->b_bcount, bp->b_resid)); CCD_DPRINTF(CCDB_IO, (" dev %x(u%d), cbp %p bn %d addr %p bcnt %ld\n", vbp->b_dev, cbp->cb_comp, cbp, vbp->b_blkno, vbp->b_data, vbp->b_bcount)); if (vbp->b_flags & B_ERROR) { cs->sc_cinfo[cbp->cb_comp].ci_flags |= CCIF_FAILED; if (cbp->cb_flags & CBF_MIRROR) comptype = " (mirror)"; else { bp->b_flags |= B_ERROR; bp->b_error = vbp->b_error ? vbp->b_error : EIO; comptype = ""; } printf("%s: error %d on component %d%s\n", cs->sc_xname, bp->b_error, cbp->cb_comp, comptype); } cbp->cb_flags |= CBF_DONE; if (cbp->cb_dep && (cbp->cb_dep->cb_flags & CBF_DONE) != (cbp->cb_flags & CBF_DONE)) return; if (cbp->cb_flags & CBF_MIRROR && !(cbp->cb_dep->cb_flags & CBF_MIRROR)) { cbp = cbp->cb_dep; vbp = (struct buf *)cbp; } count = vbp->b_bcount; putccdbuf(cbp); if (cbp->cb_dep) putccdbuf(cbp->cb_dep); /* * If all done, "interrupt". * * Note that mirror component buffers aren't counted against * the original I/O buffer. */ if (count > bp->b_resid) panic("ccdiodone: count"); bp->b_resid -= count; if (bp->b_resid == 0) ccdintr(cs, bp); } /* ARGSUSED */ int ccdread(dev_t dev, struct uio *uio, int flags) { int unit = DISKUNIT(dev); struct ccd_softc *cs; CCD_DPRINTF(CCDB_FOLLOW, ("ccdread(%x, %p)\n", dev, uio)); if (unit >= numccd) return (ENXIO); cs = &ccd_softc[unit]; if ((cs->sc_flags & CCDF_INITED) == 0) return (ENXIO); /* * XXX: It's not clear that using minphys() is completely safe, * in particular, for raw I/O. Underlying devices might have some * non-obvious limits, because of the copy to user-space. */ return (physio(ccdstrategy, NULL, dev, B_READ, minphys, uio)); } /* ARGSUSED */ int ccdwrite(dev_t dev, struct uio *uio, int flags) { int unit = DISKUNIT(dev); struct ccd_softc *cs; CCD_DPRINTF(CCDB_FOLLOW, ("ccdwrite(%x, %p)\n", dev, uio)); if (unit >= numccd) return (ENXIO); cs = &ccd_softc[unit]; if ((cs->sc_flags & CCDF_INITED) == 0) return (ENXIO); /* * XXX: It's not clear that using minphys() is completely safe, * in particular, for raw I/O. Underlying devices might have some * non-obvious limits, because of the copy to user-space. */ return (physio(ccdstrategy, NULL, dev, B_WRITE, minphys, uio)); } int ccdioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) { int unit = DISKUNIT(dev); int i, j, lookedup = 0, error = 0; int part, pmask, s; struct ccd_softc *cs; struct ccd_ioctl *ccio = (struct ccd_ioctl *)data; struct ccddevice ccd; char **cpp; struct vnode **vpp; if (unit >= numccd) return (ENXIO); cs = &ccd_softc[unit]; if (cmd != CCDIOCSET && !(cs->sc_flags & CCDF_INITED)) return (ENXIO); /* access control */ switch (cmd) { case CCDIOCSET: case CCDIOCCLR: case DIOCWDINFO: case DIOCSDINFO: case DIOCWLABEL: if ((flag & FWRITE) == 0) return (EBADF); } bzero(&ccd, sizeof(ccd)); switch (cmd) { case CCDIOCSET: if (cs->sc_flags & CCDF_INITED) return (EBUSY); if (ccio->ccio_ndisks == 0 || ccio->ccio_ndisks > INT_MAX || ccio->ccio_ileave < 0) return (EINVAL); if ((error = ccdlock(cs)) != 0) return (error); /* Fill in some important bits. */ ccd.ccd_unit = unit; ccd.ccd_interleave = ccio->ccio_ileave; ccd.ccd_flags = ccio->ccio_flags & CCDF_USERMASK; /* * Allocate space for and copy in the array of * componet pathnames and device numbers. */ cpp = malloc(ccio->ccio_ndisks * sizeof(char *), M_DEVBUF, M_WAITOK); vpp = malloc(ccio->ccio_ndisks * sizeof(struct vnode *), M_DEVBUF, M_WAITOK); error = copyin((caddr_t)ccio->ccio_disks, (caddr_t)cpp, ccio->ccio_ndisks * sizeof(char **)); if (error) { free(vpp, M_DEVBUF); free(cpp, M_DEVBUF); ccdunlock(cs); return (error); } for (i = 0; i < ccio->ccio_ndisks; ++i) { CCD_DPRINTF(CCDB_INIT, ("ccdioctl: component %d: %p, lookedup = %d\n", i, cpp[i], lookedup)); if ((error = ccdlookup(cpp[i], p, &vpp[i])) != 0) { for (j = 0; j < lookedup; ++j) (void)vn_close(vpp[j], FREAD|FWRITE, p->p_ucred, p); free(vpp, M_DEVBUF); free(cpp, M_DEVBUF); ccdunlock(cs); return (error); } ++lookedup; } ccd.ccd_cpp = cpp; ccd.ccd_vpp = vpp; ccd.ccd_ndev = ccio->ccio_ndisks; /* * Initialize the ccd. Fills in the softc for us. */ if ((error = ccdinit(&ccd, cpp, p)) != 0) { for (j = 0; j < lookedup; ++j) (void)vn_close(vpp[j], FREAD|FWRITE, p->p_ucred, p); bzero(&ccd_softc[unit], sizeof(struct ccd_softc)); free(vpp, M_DEVBUF); free(cpp, M_DEVBUF); ccdunlock(cs); return (error); } /* * The ccd has been successfully initialized, so * we can place it into the array. Don't try to * read the disklabel until the disk has been attached, * because space for the disklabel is allocated * in disk_attach(); */ bcopy(&ccd, &ccddevs[unit], sizeof(ccd)); ccio->ccio_unit = unit; ccio->ccio_size = cs->sc_size; /* Attach the disk. */ cs->sc_dkdev.dk_name = cs->sc_xname; disk_attach(&cs->sc_dkdev); /* Try and read the disklabel. */ ccdgetdisklabel(dev, cs, cs->sc_dkdev.dk_label, 0); ccdunlock(cs); break; case CCDIOCCLR: if ((error = ccdlock(cs)) != 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 ((cs->sc_dkdev.dk_openmask & ~pmask) || ((cs->sc_dkdev.dk_bopenmask & pmask) && (cs->sc_dkdev.dk_copenmask & pmask))) { ccdunlock(cs); return (EBUSY); } /* * Free ccd_softc information and clear entry. */ /* Close the components and free their pathnames. */ for (i = 0; i < cs->sc_nccdisks; ++i) { /* * XXX: this close could potentially fail and * cause Bad Things. Maybe we need to force * the close to happen? */ #ifdef DIAGNOSTIC CCD_DCALL(CCDB_VNODE, vprint("CCDIOCCLR: vnode info", cs->sc_cinfo[i].ci_vp)); #endif (void)vn_close(cs->sc_cinfo[i].ci_vp, FREAD|FWRITE, p->p_ucred, p); free(cs->sc_cinfo[i].ci_path, M_DEVBUF); } /* Free interleave index. */ for (i = 0; cs->sc_itable[i].ii_ndisk; ++i) free(cs->sc_itable[i].ii_index, M_DEVBUF); /* Free component info and interleave table. */ free(cs->sc_cinfo, M_DEVBUF); free(cs->sc_itable, M_DEVBUF); cs->sc_flags &= ~CCDF_INITED; /* * Free ccddevice information and clear entry. */ free(ccddevs[unit].ccd_cpp, M_DEVBUF); free(ccddevs[unit].ccd_vpp, M_DEVBUF); bcopy(&ccd, &ccddevs[unit], sizeof(ccd)); /* Detatch the disk. */ disk_detach(&cs->sc_dkdev); /* This must be atomic. */ s = splhigh(); ccdunlock(cs); bzero(cs, sizeof(struct ccd_softc)); splx(s); break; case DIOCGPDINFO: if ((error = ccdlock(cs)) != 0) return (error); ccdgetdisklabel(dev, cs, (struct disklabel *)data, 1); ccdunlock(cs); break; case DIOCGDINFO: *(struct disklabel *)data = *(cs->sc_dkdev.dk_label); break; case DIOCGPART: ((struct partinfo *)data)->disklab = cs->sc_dkdev.dk_label; ((struct partinfo *)data)->part = &cs->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; break; case DIOCWDINFO: case DIOCSDINFO: if ((error = ccdlock(cs)) != 0) return (error); cs->sc_flags |= CCDF_LABELLING; error = setdisklabel(cs->sc_dkdev.dk_label, (struct disklabel *)data, 0); if (error == 0) { if (cmd == DIOCWDINFO) error = writedisklabel(DISKLABELDEV(dev), ccdstrategy, cs->sc_dkdev.dk_label); } cs->sc_flags &= ~CCDF_LABELLING; ccdunlock(cs); if (error) return (error); break; case DIOCWLABEL: if (*(int *)data != 0) cs->sc_flags |= CCDF_WLABEL; else cs->sc_flags &= ~CCDF_WLABEL; break; default: return (ENOTTY); } return (0); } daddr64_t ccdsize(dev_t dev) { struct ccd_softc *cs; int part, unit; daddr64_t size; unit = DISKUNIT(dev); if (unit >= numccd) return (-1); cs = &ccd_softc[unit]; if ((cs->sc_flags & CCDF_INITED) == 0) return (-1); if (ccdopen(dev, 0, S_IFBLK, curproc)) return (-1); part = DISKPART(dev); if (cs->sc_dkdev.dk_label->d_partitions[part].p_fstype != FS_SWAP) size = -1; else size = DL_GETPSIZE(&cs->sc_dkdev.dk_label->d_partitions[part]); if (ccdclose(dev, 0, S_IFBLK, curproc)) return (-1); return (size); } int ccddump(dev_t dev, daddr64_t blkno, caddr_t va, size_t size) { /* Not implemented. */ return ENXIO; } /* * Lookup the provided name in the filesystem. If the file exists, * is a valid block device, and isn't being used by anyone else, * set *vpp to the file's vnode. */ int ccdlookup(char *path, struct proc *p, struct vnode **vpp) { struct nameidata nd; struct vnode *vp; struct vattr va; int error; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, path, p); if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("ccdlookup: vn_open error = %d\n", error)); return (error); } vp = nd.ni_vp; if (vp->v_usecount > 1) { VOP_UNLOCK(vp, 0, p); (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); return (EBUSY); } if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0) { CCD_DPRINTF(CCDB_FOLLOW | CCDB_INIT, ("ccdlookup: getattr error = %d\n", error)); VOP_UNLOCK(vp, 0, p); (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); return (error); } /* XXX: eventually we should handle VREG, too. */ if (va.va_type != VBLK) { VOP_UNLOCK(vp, 0, p); (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); return (ENOTBLK); } #ifdef DIAGNOSTIC CCD_DCALL(CCDB_VNODE, vprint("ccdlookup: vnode info", vp)); #endif VOP_UNLOCK(vp, 0, p); *vpp = vp; return (0); } /* * Read the disklabel from the ccd. If one is not present, fake one * up. */ void ccdgetdisklabel(dev_t dev, struct ccd_softc *cs, struct disklabel *lp, int spoofonly) { struct ccdgeom *ccg = &cs->sc_geom; char *errstring; bzero(lp, sizeof(*lp)); DL_SETDSIZE(lp, cs->sc_size); lp->d_secsize = ccg->ccg_secsize; lp->d_nsectors = ccg->ccg_nsectors; lp->d_ntracks = ccg->ccg_ntracks; lp->d_ncylinders = ccg->ccg_ncylinders; lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; lp->d_rpm = ccg->ccg_rpm; strncpy(lp->d_typename, "ccd", sizeof(lp->d_typename)); lp->d_type = DTYPE_CCD; strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); lp->d_interleave = 1; lp->d_flags = 0; lp->d_version = 1; lp->d_magic = DISKMAGIC; lp->d_magic2 = DISKMAGIC; lp->d_checksum = dkcksum(cs->sc_dkdev.dk_label); /* * Call the generic disklabel extraction routine. */ errstring = readdisklabel(DISKLABELDEV(dev), ccdstrategy, cs->sc_dkdev.dk_label, spoofonly); /* It's actually extremely common to have unlabeled ccds. */ if (errstring != NULL) CCD_DPRINTF(CCDB_LABEL, ("%s: %s\n", cs->sc_xname, errstring)); } #ifdef CCDDEBUG void printiinfo(struct ccdiinfo *ii) { int ix, i; for (ix = 0; ii->ii_ndisk; ix++, ii++) { printf(" itab[%d]: #dk %d sblk %d soff %d", ix, ii->ii_ndisk, ii->ii_startblk, ii->ii_startoff); for (i = 0; i < ii->ii_ndisk; i++) printf(" %d", ii->ii_index[i]); printf("\n"); } } #endif