/* * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): * wrote this file. As long as you retain this notice you * can do whatever you want with this stuff. If we meet some day, and you think * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp * ---------------------------------------------------------------------------- * * $FreeBSD$ * */ /* * The following functions are based in the vn(4) driver: mdstart_swap(), * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), * and as such under the following copyright: * * 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. * 4. 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 * * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 */ #include "opt_geom.h" #include "opt_md.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MD_MODVER 1 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ #ifndef MD_NSECT #define MD_NSECT (10000 * 2) #endif static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); static int md_debug; SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) /* Image gets put here: */ static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; #endif static g_init_t g_md_init; static g_fini_t g_md_fini; static g_start_t g_md_start; static g_access_t g_md_access; static int mdunits; static struct cdev *status_dev = 0; static d_ioctl_t mdctlioctl; static struct cdevsw mdctl_cdevsw = { .d_version = D_VERSION, .d_flags = D_NEEDGIANT, .d_ioctl = mdctlioctl, .d_name = MD_NAME, }; struct g_class g_md_class = { .name = "MD", .version = G_VERSION, .init = g_md_init, .fini = g_md_fini, .start = g_md_start, .access = g_md_access, }; DECLARE_GEOM_CLASS(g_md_class, g_md); static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) #define NMASK (NINDIR-1) static int nshift; struct indir { uintptr_t *array; u_int total; u_int used; u_int shift; }; struct md_s { int unit; LIST_ENTRY(md_s) list; struct bio_queue_head bio_queue; struct mtx queue_mtx; struct cdev *dev; enum md_types type; off_t mediasize; unsigned sectorsize; unsigned opencount; unsigned fwheads; unsigned fwsectors; unsigned flags; char name[20]; struct proc *procp; struct g_geom *gp; struct g_provider *pp; /* MD_MALLOC related fields */ struct indir *indir; uma_zone_t uma; /* MD_PRELOAD related fields */ u_char *pl_ptr; size_t pl_len; /* MD_VNODE related fields */ struct vnode *vnode; char file[PATH_MAX]; struct ucred *cred; /* MD_SWAP related fields */ vm_object_t object; }; static int mddestroy(struct md_s *sc, struct thread *td); static struct indir * new_indir(u_int shift) { struct indir *ip; ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); if (ip == NULL) return (NULL); ip->array = malloc(sizeof(uintptr_t) * NINDIR, M_MDSECT, M_NOWAIT | M_ZERO); if (ip->array == NULL) { free(ip, M_MD); return (NULL); } ip->total = NINDIR; ip->shift = shift; return (ip); } static void del_indir(struct indir *ip) { free(ip->array, M_MDSECT); free(ip, M_MD); } static void destroy_indir(struct md_s *sc, struct indir *ip) { int i; for (i = 0; i < NINDIR; i++) { if (!ip->array[i]) continue; if (ip->shift) destroy_indir(sc, (struct indir*)(ip->array[i])); else if (ip->array[i] > 255) uma_zfree(sc->uma, (void *)(ip->array[i])); } del_indir(ip); } /* * This function does the math and alloctes the top level "indir" structure * for a device of "size" sectors. */ static struct indir * dimension(off_t size) { off_t rcnt; struct indir *ip; int i, layer; rcnt = size; layer = 0; while (rcnt > NINDIR) { rcnt /= NINDIR; layer++; } /* figure out log2(NINDIR) */ for (i = NINDIR, nshift = -1; i; nshift++) i >>= 1; /* * XXX: the top layer is probably not fully populated, so we allocate * too much space for ip->array in here. */ ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); ip->array = malloc(sizeof(uintptr_t) * NINDIR, M_MDSECT, M_WAITOK | M_ZERO); ip->total = NINDIR; ip->shift = layer * nshift; return (ip); } /* * Read a given sector */ static uintptr_t s_read(struct indir *ip, off_t offset) { struct indir *cip; int idx; uintptr_t up; if (md_debug > 1) printf("s_read(%jd)\n", (intmax_t)offset); up = 0; for (cip = ip; cip != NULL;) { if (cip->shift) { idx = (offset >> cip->shift) & NMASK; up = cip->array[idx]; cip = (struct indir *)up; continue; } idx = offset & NMASK; return (cip->array[idx]); } return (0); } /* * Write a given sector, prune the tree if the value is 0 */ static int s_write(struct indir *ip, off_t offset, uintptr_t ptr) { struct indir *cip, *lip[10]; int idx, li; uintptr_t up; if (md_debug > 1) printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); up = 0; li = 0; cip = ip; for (;;) { lip[li++] = cip; if (cip->shift) { idx = (offset >> cip->shift) & NMASK; up = cip->array[idx]; if (up != 0) { cip = (struct indir *)up; continue; } /* Allocate branch */ cip->array[idx] = (uintptr_t)new_indir(cip->shift - nshift); if (cip->array[idx] == 0) return (ENOSPC); cip->used++; up = cip->array[idx]; cip = (struct indir *)up; continue; } /* leafnode */ idx = offset & NMASK; up = cip->array[idx]; if (up != 0) cip->used--; cip->array[idx] = ptr; if (ptr != 0) cip->used++; break; } if (cip->used != 0 || li == 1) return (0); li--; while (cip->used == 0 && cip != ip) { li--; idx = (offset >> lip[li]->shift) & NMASK; up = lip[li]->array[idx]; KASSERT(up == (uintptr_t)cip, ("md screwed up")); del_indir(cip); lip[li]->array[idx] = 0; lip[li]->used--; cip = lip[li]; } return (0); } static int g_md_access(struct g_provider *pp, int r, int w, int e) { struct md_s *sc; sc = pp->geom->softc; if (sc == NULL) return (ENXIO); r += pp->acr; w += pp->acw; e += pp->ace; if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { sc->opencount = 1; } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { sc->opencount = 0; } return (0); } static void g_md_start(struct bio *bp) { struct md_s *sc; sc = bp->bio_to->geom->softc; mtx_lock(&sc->queue_mtx); bioq_disksort(&sc->bio_queue, bp); mtx_unlock(&sc->queue_mtx); wakeup(sc); } static int mdstart_malloc(struct md_s *sc, struct bio *bp) { int i, error; u_char *dst; off_t secno, nsec, uc; uintptr_t sp, osp; nsec = bp->bio_length / sc->sectorsize; secno = bp->bio_offset / sc->sectorsize; dst = bp->bio_data; error = 0; while (nsec--) { osp = s_read(sc->indir, secno); if (bp->bio_cmd == BIO_DELETE) { if (osp != 0) error = s_write(sc->indir, secno, 0); } else if (bp->bio_cmd == BIO_READ) { if (osp == 0) bzero(dst, sc->sectorsize); else if (osp <= 255) for (i = 0; i < sc->sectorsize; i++) dst[i] = osp; else bcopy((void *)osp, dst, sc->sectorsize); osp = 0; } else if (bp->bio_cmd == BIO_WRITE) { if (sc->flags & MD_COMPRESS) { uc = dst[0]; for (i = 1; i < sc->sectorsize; i++) if (dst[i] != uc) break; } else { i = 0; uc = 0; } if (i == sc->sectorsize) { if (osp != uc) error = s_write(sc->indir, secno, uc); } else { if (osp <= 255) { sp = (uintptr_t)uma_zalloc(sc->uma, M_NOWAIT); if (sp == 0) { error = ENOSPC; break; } bcopy(dst, (void *)sp, sc->sectorsize); error = s_write(sc->indir, secno, sp); } else { bcopy(dst, (void *)osp, sc->sectorsize); osp = 0; } } } else { error = EOPNOTSUPP; } if (osp > 255) uma_zfree(sc->uma, (void*)osp); if (error) break; secno++; dst += sc->sectorsize; } bp->bio_resid = 0; return (error); } static int mdstart_preload(struct md_s *sc, struct bio *bp) { switch (bp->bio_cmd) { case BIO_READ: bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, bp->bio_length); break; case BIO_WRITE: bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, bp->bio_length); break; } bp->bio_resid = 0; return (0); } static int mdstart_vnode(struct md_s *sc, struct bio *bp) { int error; struct uio auio; struct iovec aiov; struct mount *mp; /* * VNODE I/O * * If an error occurs, we set BIO_ERROR but we do not set * B_INVAL because (for a write anyway), the buffer is * still valid. */ bzero(&auio, sizeof(auio)); aiov.iov_base = bp->bio_data; aiov.iov_len = bp->bio_length; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = (vm_ooffset_t)bp->bio_offset; auio.uio_segflg = UIO_SYSSPACE; if(bp->bio_cmd == BIO_READ) auio.uio_rw = UIO_READ; else if(bp->bio_cmd == BIO_WRITE) auio.uio_rw = UIO_WRITE; else panic("wrong BIO_OP in mdstart_vnode"); auio.uio_resid = bp->bio_length; auio.uio_td = curthread; /* * When reading set IO_DIRECT to try to avoid double-caching * the data. When writing IO_DIRECT is not optimal. */ if (bp->bio_cmd == BIO_READ) { vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); VOP_UNLOCK(sc->vnode, 0, curthread); } else { (void) vn_start_write(sc->vnode, &mp, V_WAIT); vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); error = VOP_WRITE(sc->vnode, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); VOP_UNLOCK(sc->vnode, 0, curthread); vn_finished_write(mp); } bp->bio_resid = auio.uio_resid; return (error); } static int mdstart_swap(struct md_s *sc, struct bio *bp) { struct sf_buf *sf; int rv, offs, len, lastend; vm_pindex_t i, lastp; vm_page_t m; u_char *p; p = bp->bio_data; /* * offs is the ofset at whih to start operating on the * next (ie, first) page. lastp is the last page on * which we're going to operate. lastend is the ending * position within that last page (ie, PAGE_SIZE if * we're operating on complete aligned pages). */ offs = bp->bio_offset % PAGE_SIZE; lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; rv = VM_PAGER_OK; VM_OBJECT_LOCK(sc->object); vm_object_pip_add(sc->object, 1); for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; m = vm_page_grab(sc->object, i, VM_ALLOC_NORMAL|VM_ALLOC_RETRY); VM_OBJECT_UNLOCK(sc->object); sf = sf_buf_alloc(m, 0); VM_OBJECT_LOCK(sc->object); if (bp->bio_cmd == BIO_READ) { if (m->valid != VM_PAGE_BITS_ALL) rv = vm_pager_get_pages(sc->object, &m, 1, 0); if (rv == VM_PAGER_ERROR) { sf_buf_free(sf); vm_page_wakeup(m); break; } bcopy((void *)(sf_buf_kva(sf) + offs), p, len); } else if (bp->bio_cmd == BIO_WRITE) { if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) rv = vm_pager_get_pages(sc->object, &m, 1, 0); if (rv == VM_PAGER_ERROR) { sf_buf_free(sf); vm_page_wakeup(m); break; } bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); m->valid = VM_PAGE_BITS_ALL; #if 0 } else if (bp->bio_cmd == BIO_DELETE) { if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) rv = vm_pager_get_pages(sc->object, &m, 1, 0); if (rv == VM_PAGER_ERROR) { sf_buf_free(sf); vm_page_wakeup(m); break; } bzero((void *)(sf_buf_kva(sf) + offs), len); vm_page_dirty(m); m->valid = VM_PAGE_BITS_ALL; #endif } sf_buf_free(sf); vm_page_lock_queues(); vm_page_wakeup(m); vm_page_activate(m); if (bp->bio_cmd == BIO_WRITE) vm_page_dirty(m); vm_page_unlock_queues(); /* Actions on further pages start at offset 0 */ p += PAGE_SIZE - offs; offs = 0; #if 0 if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", m->wire_count, m->busy, m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); #endif } vm_object_pip_subtract(sc->object, 1); vm_object_set_writeable_dirty(sc->object); VM_OBJECT_UNLOCK(sc->object); return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); } static void md_kthread(void *arg) { struct md_s *sc; struct bio *bp; int error, hasgiant; sc = arg; curthread->td_base_pri = PRIBIO; switch (sc->type) { case MD_VNODE: mtx_lock(&Giant); hasgiant = 1; break; case MD_MALLOC: case MD_PRELOAD: case MD_SWAP: default: hasgiant = 0; break; } for (;;) { mtx_lock(&sc->queue_mtx); bp = bioq_takefirst(&sc->bio_queue); if (!bp) { if (sc->flags & MD_SHUTDOWN) { mtx_unlock(&sc->queue_mtx); sc->procp = NULL; wakeup(&sc->procp); if (hasgiant) mtx_unlock(&Giant); kthread_exit(0); } msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); continue; } mtx_unlock(&sc->queue_mtx); if (bp->bio_cmd == BIO_GETATTR) { if (sc->fwsectors && sc->fwheads && (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) || g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads))) error = -1; else error = EOPNOTSUPP; } else { switch (sc->type) { case MD_MALLOC: error = mdstart_malloc(sc, bp); break; case MD_PRELOAD: error = mdstart_preload(sc, bp); break; case MD_VNODE: error = mdstart_vnode(sc, bp); break; case MD_SWAP: error = mdstart_swap(sc, bp); break; default: panic("Impossible md(type)"); break; } } if (error != -1) { bp->bio_completed = bp->bio_length; g_io_deliver(bp, error); } } } static struct md_s * mdfind(int unit) { struct md_s *sc; /* XXX: LOCK(unique unit numbers) */ LIST_FOREACH(sc, &md_softc_list, list) { if (sc->unit == unit) break; } /* XXX: UNLOCK(unique unit numbers) */ return (sc); } static struct md_s * mdnew(int unit) { struct md_s *sc; int error, max = -1; /* XXX: LOCK(unique unit numbers) */ LIST_FOREACH(sc, &md_softc_list, list) { if (sc->unit == unit) { /* XXX: UNLOCK(unique unit numbers) */ return (NULL); } if (sc->unit > max) max = sc->unit; } if (unit == -1) unit = max + 1; sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); sc->unit = unit; bioq_init(&sc->bio_queue); mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); sprintf(sc->name, "md%d", unit); error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); if (error) { free(sc, M_MD); return (NULL); } LIST_INSERT_HEAD(&md_softc_list, sc, list); /* XXX: UNLOCK(unique unit numbers) */ return (sc); } static void mdinit(struct md_s *sc) { struct g_geom *gp; struct g_provider *pp; DROP_GIANT(); g_topology_lock(); gp = g_new_geomf(&g_md_class, "md%d", sc->unit); gp->softc = sc; pp = g_new_providerf(gp, "md%d", sc->unit); pp->mediasize = sc->mediasize; pp->sectorsize = sc->sectorsize; sc->gp = gp; sc->pp = pp; g_error_provider(pp, 0); g_topology_unlock(); PICKUP_GIANT(); } /* * XXX: we should check that the range they feed us is mapped. * XXX: we should implement read-only. */ static int mdcreate_preload(struct md_s *sc, struct md_ioctl *mdio) { if (mdio->md_options & ~(MD_AUTOUNIT | MD_FORCE)) return (EINVAL); sc->flags = mdio->md_options & MD_FORCE; /* Cast to pointer size, then to pointer to avoid warning */ sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; sc->pl_len = (size_t)sc->mediasize; return (0); } static int mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) { uintptr_t sp; int error; off_t u; error = 0; if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) return (EINVAL); if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) return (EINVAL); /* Compression doesn't make sense if we have reserved space */ if (mdio->md_options & MD_RESERVE) mdio->md_options &= ~MD_COMPRESS; if (mdio->md_fwsectors != 0) sc->fwsectors = mdio->md_fwsectors; if (mdio->md_fwheads != 0) sc->fwheads = mdio->md_fwheads; sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); sc->indir = dimension(sc->mediasize / sc->sectorsize); sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 0x1ff, 0); if (mdio->md_options & MD_RESERVE) { off_t nsectors; nsectors = sc->mediasize / sc->sectorsize; for (u = 0; u < nsectors; u++) { sp = (uintptr_t)uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); if (sp != 0) error = s_write(sc->indir, u, sp); else error = ENOMEM; if (error != 0) break; } } if (error != 0) uma_zdestroy(sc->uma); return (error); } static int mdsetcred(struct md_s *sc, struct ucred *cred) { char *tmpbuf; int error = 0; /* * Set credits in our softc */ if (sc->cred) crfree(sc->cred); sc->cred = crhold(cred); /* * Horrible kludge to establish credentials for NFS XXX. */ if (sc->vnode) { struct uio auio; struct iovec aiov; tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); bzero(&auio, sizeof(auio)); aiov.iov_base = tmpbuf; aiov.iov_len = sc->sectorsize; 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(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); error = VOP_READ(sc->vnode, &auio, 0, sc->cred); VOP_UNLOCK(sc->vnode, 0, curthread); free(tmpbuf, M_TEMP); } return (error); } static int mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) { struct vattr vattr; struct nameidata nd; int error, flags; if (strlcpy(sc->file, mdio->md_file, sizeof(sc->file)) >= sizeof(sc->file)) { return (ENAMETOOLONG); } flags = FREAD|FWRITE; NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); error = vn_open(&nd, &flags, 0, -1); if (error) { NDFREE(&nd, NDF_ONLY_PNBUF); if (error != EACCES && error != EPERM && error != EROFS) return (error); flags &= ~FWRITE; NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); error = vn_open(&nd, &flags, 0, -1); } NDFREE(&nd, NDF_ONLY_PNBUF); if (error) return (error); if (nd.ni_vp->v_type != VREG || (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { VOP_UNLOCK(nd.ni_vp, 0, td); (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); return (error ? error : EINVAL); } VOP_UNLOCK(nd.ni_vp, 0, td); if (mdio->md_fwsectors != 0) sc->fwsectors = mdio->md_fwsectors; if (mdio->md_fwheads != 0) sc->fwheads = mdio->md_fwheads; sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); if (!(flags & FWRITE)) sc->flags |= MD_READONLY; sc->vnode = nd.ni_vp; error = mdsetcred(sc, td->td_ucred); if (error != 0) { (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); return (error); } return (0); } static void md_zapit(void *p, int cancel) { if (cancel) return; g_wither_geom(p, ENXIO); } static int mddestroy(struct md_s *sc, struct thread *td) { GIANT_REQUIRED; mtx_destroy(&sc->queue_mtx); if (sc->gp) { sc->gp->softc = NULL; g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); sc->gp = NULL; sc->pp = NULL; } sc->flags |= MD_SHUTDOWN; wakeup(sc); while (sc->procp != NULL) tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); if (sc->vnode != NULL) (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? FREAD : (FREAD|FWRITE), sc->cred, td); if (sc->cred != NULL) crfree(sc->cred); if (sc->object != NULL) { vm_object_deallocate(sc->object); } if (sc->indir) destroy_indir(sc, sc->indir); if (sc->uma) uma_zdestroy(sc->uma); /* XXX: LOCK(unique unit numbers) */ LIST_REMOVE(sc, list); /* XXX: UNLOCK(unique unit numbers) */ free(sc, M_MD); return (0); } static int mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) { vm_ooffset_t npage; int error; GIANT_REQUIRED; /* * Range check. Disallow negative sizes or any size less then the * size of a page. Then round to a page. */ if (sc->mediasize == 0 || (sc->mediasize % PAGE_SIZE) != 0) return (EDOM); /* * Allocate an OBJT_SWAP object. * * Note the truncation. */ npage = mdio->md_mediasize / PAGE_SIZE; if (mdio->md_fwsectors != 0) sc->fwsectors = mdio->md_fwsectors; if (mdio->md_fwheads != 0) sc->fwheads = mdio->md_fwheads; sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, VM_PROT_DEFAULT, 0); if (sc->object == NULL) return (ENOMEM); sc->flags = mdio->md_options & MD_FORCE; if (mdio->md_options & MD_RESERVE) { if (swap_pager_reserve(sc->object, 0, npage) < 0) { vm_object_deallocate(sc->object); sc->object = NULL; return (EDOM); } } error = mdsetcred(sc, td->td_ucred); if (error) { vm_object_deallocate(sc->object); sc->object = NULL; } return (error); } static int mddetach(int unit, struct thread *td) { struct md_s *sc; sc = mdfind(unit); if (sc == NULL) return (ENOENT); if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) return (EBUSY); switch(sc->type) { case MD_VNODE: case MD_SWAP: case MD_MALLOC: case MD_PRELOAD: return (mddestroy(sc, td)); default: return (EOPNOTSUPP); } } static int mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) { struct md_ioctl *mdio; struct md_s *sc; int error, i; if (md_debug) printf("mdctlioctl(%s %lx %p %x %p)\n", devtoname(dev), cmd, addr, flags, td); /* * We assert the version number in the individual ioctl * handlers instead of out here because (a) it is possible we * may add another ioctl in the future which doesn't read an * mdio, and (b) the correct return value for an unknown ioctl * is ENOIOCTL, not EINVAL. */ mdio = (struct md_ioctl *)addr; switch (cmd) { case MDIOCATTACH: if (mdio->md_version != MDIOVERSION) return (EINVAL); switch (mdio->md_type) { case MD_MALLOC: case MD_PRELOAD: case MD_VNODE: case MD_SWAP: break; default: return (EINVAL); } if (mdio->md_options & MD_AUTOUNIT) { sc = mdnew(-1); mdio->md_unit = sc->unit; } else { sc = mdnew(mdio->md_unit); if (sc == NULL) return (EBUSY); } sc->type = mdio->md_type; sc->mediasize = mdio->md_mediasize; if (mdio->md_sectorsize == 0) sc->sectorsize = DEV_BSIZE; else sc->sectorsize = mdio->md_sectorsize; error = EDOOFUS; switch (sc->type) { case MD_MALLOC: error = mdcreate_malloc(sc, mdio); break; case MD_PRELOAD: error = mdcreate_preload(sc, mdio); break; case MD_VNODE: error = mdcreate_vnode(sc, mdio, td); break; case MD_SWAP: error = mdcreate_swap(sc, mdio, td); break; } if (error != 0) { mddestroy(sc, td); return (error); } mdinit(sc); return (0); case MDIOCDETACH: if (mdio->md_version != MDIOVERSION) return (EINVAL); if (mdio->md_file != NULL || mdio->md_mediasize != 0 || mdio->md_options != 0) return (EINVAL); return (mddetach(mdio->md_unit, td)); case MDIOCQUERY: if (mdio->md_version != MDIOVERSION) return (EINVAL); sc = mdfind(mdio->md_unit); if (sc == NULL) return (ENOENT); mdio->md_type = sc->type; mdio->md_options = sc->flags; mdio->md_mediasize = sc->mediasize; mdio->md_sectorsize = sc->sectorsize; if (sc->type == MD_VNODE) { if (strlcpy(mdio->md_file, sc->file, sizeof(mdio->md_file)) >= sizeof(mdio->md_file)) { return (ENAMETOOLONG); } } return (0); case MDIOCLIST: if (mdio->md_version != MDIOVERSION) return (EINVAL); i = 1; LIST_FOREACH(sc, &md_softc_list, list) { if (i == MDNPAD - 1) mdio->md_pad[i] = -1; else mdio->md_pad[i++] = sc->unit; } mdio->md_pad[0] = i - 1; return (0); default: return (ENOIOCTL); }; return (ENOIOCTL); } static void md_preloaded(u_char *image, size_t length) { struct md_s *sc; sc = mdnew(-1); if (sc == NULL) return; sc->type = MD_PRELOAD; sc->mediasize = length; sc->sectorsize = DEV_BSIZE; sc->pl_ptr = image; sc->pl_len = length; #ifdef MD_ROOT if (sc->unit == 0) rootdevnames[0] = "ufs:/dev/md0"; #endif mdinit(sc); } static void g_md_init(struct g_class *mp __unused) { caddr_t mod; caddr_t c; u_char *ptr, *name, *type; unsigned len; mod = NULL; g_topology_unlock(); #ifdef MD_ROOT_SIZE md_preloaded(mfs_root, MD_ROOT_SIZE*1024); #endif while ((mod = preload_search_next_name(mod)) != NULL) { name = (char *)preload_search_info(mod, MODINFO_NAME); type = (char *)preload_search_info(mod, MODINFO_TYPE); if (name == NULL) continue; if (type == NULL) continue; if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) continue; c = preload_search_info(mod, MODINFO_ADDR); ptr = *(u_char **)c; c = preload_search_info(mod, MODINFO_SIZE); len = *(size_t *)c; printf("%s%d: Preloaded image <%s> %d bytes at %p\n", MD_NAME, mdunits, name, len, ptr); md_preloaded(ptr, len); } status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 0600, MDCTL_NAME); g_topology_lock(); } static void g_md_fini(struct g_class *mp __unused) { if (status_dev != NULL) destroy_dev(status_dev); }