The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_slice.c

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    1 /*-
    2  * Copyright (c) 2002 Poul-Henning Kamp
    3  * Copyright (c) 2002 Networks Associates Technology, Inc.
    4  * All rights reserved.
    5  *
    6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
    7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
    8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
    9  * DARPA CHATS research program.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. The names of the authors may not be used to endorse or promote
   20  *    products derived from this software without specific prior written
   21  *    permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: releng/11.2/sys/geom/geom_slice.c 325907 2017-11-16 22:25:12Z avg $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/kernel.h>
   42 #include <sys/malloc.h>
   43 #include <sys/bio.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/proc.h>
   46 #include <sys/lock.h>
   47 #include <sys/mutex.h>
   48 #include <sys/errno.h>
   49 #include <sys/sbuf.h>
   50 #include <geom/geom.h>
   51 #include <geom/geom_slice.h>
   52 #include <machine/stdarg.h>
   53 
   54 static g_access_t g_slice_access;
   55 static g_start_t g_slice_start;
   56 
   57 static struct g_slicer *
   58 g_slice_alloc(unsigned nslice, unsigned scsize)
   59 {
   60         struct g_slicer *gsp;
   61 
   62         gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO);
   63         if (scsize > 0)
   64                 gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO);
   65         else
   66                 gsp->softc = NULL;
   67         gsp->slices = g_malloc(nslice * sizeof(struct g_slice),
   68             M_WAITOK | M_ZERO);
   69         gsp->nslice = nslice;
   70         return (gsp);
   71 }
   72 
   73 static void
   74 g_slice_free(struct g_geom *gp)
   75 {
   76         struct g_slicer *gsp;
   77 
   78         gsp = gp->softc;
   79         gp->softc = NULL;
   80 
   81         /*
   82          * We can get multiple spoiled events before wither-washer
   83          * detaches our consumer, so this can get called multiple
   84          * times.
   85          */
   86         if (gsp == NULL)
   87                 return;
   88         g_free(gsp->slices);
   89         if (gsp->hotspot != NULL)
   90                 g_free(gsp->hotspot);
   91         if (gsp->softc != NULL)
   92                 g_free(gsp->softc);
   93         g_free(gsp);
   94 }
   95 
   96 static int
   97 g_slice_access(struct g_provider *pp, int dr, int dw, int de)
   98 {
   99         int error;
  100         u_int u;
  101         struct g_geom *gp;
  102         struct g_consumer *cp;
  103         struct g_provider *pp2;
  104         struct g_slicer *gsp;
  105         struct g_slice *gsl, *gsl2;
  106 
  107         gp = pp->geom;
  108         cp = LIST_FIRST(&gp->consumer);
  109         KASSERT (cp != NULL, ("g_slice_access but no consumer"));
  110         gsp = gp->softc;
  111         if (dr > 0 || dw > 0 || de > 0) {
  112                 gsl = &gsp->slices[pp->index];
  113                 for (u = 0; u < gsp->nslice; u++) {
  114                         gsl2 = &gsp->slices[u];
  115                         if (gsl2->length == 0)
  116                                 continue;
  117                         if (u == pp->index)
  118                                 continue;
  119                         if (gsl->offset + gsl->length <= gsl2->offset)
  120                                 continue;
  121                         if (gsl2->offset + gsl2->length <= gsl->offset)
  122                                 continue;
  123                         /* overlap */
  124                         pp2 = gsl2->provider;
  125                         if ((pp->acw + dw) > 0 && pp2->ace > 0)
  126                                 return (EPERM);
  127                         if ((pp->ace + de) > 0 && pp2->acw > 0)
  128                                 return (EPERM);
  129                 }
  130         }
  131         /* On first open, grab an extra "exclusive" bit */
  132         if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0)
  133                 de++;
  134         /* ... and let go of it on last close */
  135         if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1)
  136                 de--;
  137         error = g_access(cp, dr, dw, de);
  138 
  139         /*
  140          * Free the softc if all providers have been closed and this geom
  141          * is being removed.
  142          */
  143         if (error == 0 && (gp->flags & G_GEOM_WITHER) != 0 &&
  144             (cp->acr + cp->acw + cp->ace) == 0)
  145                 g_slice_free(gp);
  146 
  147         return (error);
  148 }
  149 
  150 /*
  151  * XXX: It should be possible to specify here if we should finish all of the
  152  * XXX: bio, or only the non-hot bits.  This would get messy if there were
  153  * XXX: two hot spots in the same bio, so for now we simply finish off the
  154  * XXX: entire bio.  Modifying hot data on the way to disk is frowned on
  155  * XXX: so making that considerably harder is not a bad idea anyway.
  156  */
  157 void
  158 g_slice_finish_hot(struct bio *bp)
  159 {
  160         struct bio *bp2;
  161         struct g_geom *gp;
  162         struct g_consumer *cp;
  163         struct g_slicer *gsp;
  164         struct g_slice *gsl;
  165         int idx;
  166 
  167         KASSERT(bp->bio_to != NULL,
  168             ("NULL bio_to in g_slice_finish_hot(%p)", bp));
  169         KASSERT(bp->bio_from != NULL,
  170             ("NULL bio_from in g_slice_finish_hot(%p)", bp));
  171         gp = bp->bio_to->geom;
  172         gsp = gp->softc;
  173         cp = LIST_FIRST(&gp->consumer);
  174         KASSERT(cp != NULL, ("NULL consumer in g_slice_finish_hot(%p)", bp));
  175         idx = bp->bio_to->index;
  176         gsl = &gsp->slices[idx];
  177 
  178         bp2 = g_clone_bio(bp);
  179         if (bp2 == NULL) {
  180                 g_io_deliver(bp, ENOMEM);
  181                 return;
  182         }
  183         if (bp2->bio_offset + bp2->bio_length > gsl->length)
  184                 bp2->bio_length = gsl->length - bp2->bio_offset;
  185         bp2->bio_done = g_std_done;
  186         bp2->bio_offset += gsl->offset;
  187         g_io_request(bp2, cp);
  188         return;
  189 }
  190 
  191 static void
  192 g_slice_done(struct bio *bp)
  193 {
  194 
  195         KASSERT(bp->bio_cmd == BIO_GETATTR &&
  196             strcmp(bp->bio_attribute, "GEOM::ident") == 0,
  197             ("bio_cmd=0x%x bio_attribute=%s", bp->bio_cmd, bp->bio_attribute));
  198 
  199         if (bp->bio_error == 0 && bp->bio_data[0] != '\0') {
  200                 char idx[8];
  201 
  202                 /* Add index to the ident received. */
  203                 snprintf(idx, sizeof(idx), "s%d",
  204                     bp->bio_parent->bio_to->index);
  205                 if (strlcat(bp->bio_data, idx, bp->bio_length) >=
  206                     bp->bio_length) {
  207                         bp->bio_error = EFAULT;
  208                 }
  209         }
  210         g_std_done(bp);
  211 }
  212 
  213 static void
  214 g_slice_start(struct bio *bp)
  215 {
  216         struct bio *bp2;
  217         struct g_provider *pp;
  218         struct g_geom *gp;
  219         struct g_consumer *cp;
  220         struct g_slicer *gsp;
  221         struct g_slice *gsl;
  222         struct g_slice_hot *ghp;
  223         int idx, error;
  224         u_int m_index;
  225         off_t t;
  226 
  227         pp = bp->bio_to;
  228         gp = pp->geom;
  229         gsp = gp->softc;
  230         cp = LIST_FIRST(&gp->consumer);
  231         idx = pp->index;
  232         gsl = &gsp->slices[idx];
  233         switch(bp->bio_cmd) {
  234         case BIO_READ:
  235         case BIO_WRITE:
  236         case BIO_DELETE:
  237                 if (bp->bio_offset > gsl->length) {
  238                         g_io_deliver(bp, EINVAL); /* XXX: EWHAT ? */
  239                         return;
  240                 }
  241                 /*
  242                  * Check if we collide with any hot spaces, and call the
  243                  * method once if so.
  244                  */
  245                 t = bp->bio_offset + gsl->offset;
  246                 for (m_index = 0; m_index < gsp->nhotspot; m_index++) {
  247                         ghp = &gsp->hotspot[m_index];
  248                         if (t >= ghp->offset + ghp->length)
  249                                 continue;
  250                         if (t + bp->bio_length <= ghp->offset)
  251                                 continue;
  252                         switch(bp->bio_cmd) {
  253                         case BIO_READ:          idx = ghp->ract; break;
  254                         case BIO_WRITE:         idx = ghp->wact; break;
  255                         case BIO_DELETE:        idx = ghp->dact; break;
  256                         }
  257                         switch(idx) {
  258                         case G_SLICE_HOT_ALLOW:
  259                                 /* Fall out and continue normal processing */
  260                                 continue;
  261                         case G_SLICE_HOT_DENY:
  262                                 g_io_deliver(bp, EROFS);
  263                                 return;
  264                         case G_SLICE_HOT_START:
  265                                 error = gsp->start(bp);
  266                                 if (error && error != EJUSTRETURN)
  267                                         g_io_deliver(bp, error);
  268                                 return;
  269                         case G_SLICE_HOT_CALL:
  270                                 error = g_post_event(gsp->hot, bp, M_NOWAIT,
  271                                     gp, NULL);
  272                                 if (error)
  273                                         g_io_deliver(bp, error);
  274                                 return;
  275                         }
  276                         break;
  277                 }
  278                 bp2 = g_clone_bio(bp);
  279                 if (bp2 == NULL) {
  280                         g_io_deliver(bp, ENOMEM);
  281                         return;
  282                 }
  283                 if (bp2->bio_offset + bp2->bio_length > gsl->length)
  284                         bp2->bio_length = gsl->length - bp2->bio_offset;
  285                 bp2->bio_done = g_std_done;
  286                 bp2->bio_offset += gsl->offset;
  287                 g_io_request(bp2, cp);
  288                 return;
  289         case BIO_GETATTR:
  290                 /* Give the real method a chance to override */
  291                 if (gsp->start != NULL && gsp->start(bp))
  292                         return;
  293                 if (!strcmp("GEOM::ident", bp->bio_attribute)) {
  294                         bp2 = g_clone_bio(bp);
  295                         if (bp2 == NULL) {
  296                                 g_io_deliver(bp, ENOMEM);
  297                                 return;
  298                         }
  299                         bp2->bio_done = g_slice_done;
  300                         g_io_request(bp2, cp);
  301                         return;
  302                 }
  303                 if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) {
  304                         struct g_kerneldump *gkd;
  305 
  306                         gkd = (struct g_kerneldump *)bp->bio_data;
  307                         gkd->offset += gsp->slices[idx].offset;
  308                         if (gkd->length > gsp->slices[idx].length)
  309                                 gkd->length = gsp->slices[idx].length;
  310                         /* now, pass it on downwards... */
  311                 }
  312                 /* FALLTHROUGH */
  313         case BIO_FLUSH:
  314                 bp2 = g_clone_bio(bp);
  315                 if (bp2 == NULL) {
  316                         g_io_deliver(bp, ENOMEM);
  317                         return;
  318                 }
  319                 bp2->bio_done = g_std_done;
  320                 g_io_request(bp2, cp);
  321                 break;
  322         default:
  323                 g_io_deliver(bp, EOPNOTSUPP);
  324                 return;
  325         }
  326 }
  327 
  328 void
  329 g_slice_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
  330 {
  331         struct g_slicer *gsp;
  332 
  333         gsp = gp->softc;
  334         if (indent == NULL) {
  335                 sbuf_printf(sb, " i %u", pp->index);
  336                 sbuf_printf(sb, " o %ju", 
  337                     (uintmax_t)gsp->slices[pp->index].offset);
  338                 return;
  339         }
  340         if (pp != NULL) {
  341                 sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index);
  342                 sbuf_printf(sb, "%s<length>%ju</length>\n",
  343                     indent, (uintmax_t)gsp->slices[pp->index].length);
  344                 sbuf_printf(sb, "%s<seclength>%ju</seclength>\n", indent,
  345                     (uintmax_t)gsp->slices[pp->index].length / 512);
  346                 sbuf_printf(sb, "%s<offset>%ju</offset>\n", indent,
  347                     (uintmax_t)gsp->slices[pp->index].offset);
  348                 sbuf_printf(sb, "%s<secoffset>%ju</secoffset>\n", indent,
  349                     (uintmax_t)gsp->slices[pp->index].offset / 512);
  350         }
  351 }
  352 
  353 int
  354 g_slice_config(struct g_geom *gp, u_int idx, int how, off_t offset, off_t length, u_int sectorsize, const char *fmt, ...)
  355 {
  356         struct g_provider *pp, *pp2;
  357         struct g_slicer *gsp;
  358         struct g_slice *gsl;
  359         va_list ap;
  360         struct sbuf *sb;
  361         int acc;
  362 
  363         g_trace(G_T_TOPOLOGY, "g_slice_config(%s, %d, %d)",
  364              gp->name, idx, how);
  365         g_topology_assert();
  366         gsp = gp->softc;
  367         if (idx >= gsp->nslice)
  368                 return(EINVAL);
  369         gsl = &gsp->slices[idx];
  370         pp = gsl->provider;
  371         if (pp != NULL)
  372                 acc = pp->acr + pp->acw + pp->ace;
  373         else
  374                 acc = 0;
  375         if (acc != 0 && how != G_SLICE_CONFIG_FORCE) {
  376                 if (length < gsl->length)
  377                         return(EBUSY);
  378                 if (offset != gsl->offset)
  379                         return(EBUSY);
  380         }
  381         /* XXX: check offset + length <= MEDIASIZE */
  382         if (how == G_SLICE_CONFIG_CHECK)
  383                 return (0);
  384         gsl->length = length;
  385         gsl->offset = offset;
  386         gsl->sectorsize = sectorsize;
  387         if (length == 0) {
  388                 if (pp == NULL)
  389                         return (0);
  390                 if (bootverbose)
  391                         printf("GEOM: Deconfigure %s\n", pp->name);
  392                 g_wither_provider(pp, ENXIO);
  393                 gsl->provider = NULL;
  394                 gsp->nprovider--;
  395                 return (0);
  396         }
  397         if (pp != NULL) {
  398                 if (bootverbose)
  399                         printf("GEOM: Reconfigure %s, start %jd length %jd end %jd\n",
  400                             pp->name, (intmax_t)offset, (intmax_t)length,
  401                             (intmax_t)(offset + length - 1));
  402                 g_resize_provider(pp, gsl->length);
  403                 return (0);
  404         }
  405         sb = sbuf_new_auto();
  406         va_start(ap, fmt);
  407         sbuf_vprintf(sb, fmt, ap);
  408         va_end(ap);
  409         sbuf_finish(sb);
  410         pp = g_new_providerf(gp, "%s", sbuf_data(sb));
  411         pp2 = LIST_FIRST(&gp->consumer)->provider;
  412         pp->stripesize = pp2->stripesize;
  413         pp->stripeoffset = pp2->stripeoffset + offset;
  414         if (pp->stripesize > 0)
  415                 pp->stripeoffset %= pp->stripesize;
  416         if (gsp->nhotspot == 0) {
  417                 pp->flags |= pp2->flags & G_PF_ACCEPT_UNMAPPED;
  418                 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
  419         }
  420         if (0 && bootverbose)
  421                 printf("GEOM: Configure %s, start %jd length %jd end %jd\n",
  422                     pp->name, (intmax_t)offset, (intmax_t)length,
  423                     (intmax_t)(offset + length - 1));
  424         pp->index = idx;
  425         pp->mediasize = gsl->length;
  426         pp->sectorsize = gsl->sectorsize;
  427         gsl->provider = pp;
  428         gsp->nprovider++;
  429         g_error_provider(pp, 0);
  430         sbuf_delete(sb);
  431         return(0);
  432 }
  433 
  434 /*
  435  * Configure "hotspots".  A hotspot is a piece of the parent device which
  436  * this particular slicer cares about for some reason.  Typically because
  437  * it contains meta-data used to configure the slicer.
  438  * A hotspot is identified by its index number. The offset and length are
  439  * relative to the parent device, and the three "?act" fields specify
  440  * what action to take on BIO_READ, BIO_DELETE and BIO_WRITE.
  441  *
  442  * XXX: There may be a race relative to g_slice_start() here, if an existing
  443  * XXX: hotspot is changed wile I/O is happening.  Should this become a problem
  444  * XXX: we can protect the hotspot stuff with a mutex.
  445  */
  446 
  447 int
  448 g_slice_conf_hot(struct g_geom *gp, u_int idx, off_t offset, off_t length, int ract, int dact, int wact)
  449 {
  450         struct g_slicer *gsp;
  451         struct g_slice_hot *gsl, *gsl2;
  452         struct g_consumer *cp;
  453         struct g_provider *pp;
  454 
  455         g_trace(G_T_TOPOLOGY, "g_slice_conf_hot(%s, idx: %d, off: %jd, len: %jd)",
  456             gp->name, idx, (intmax_t)offset, (intmax_t)length);
  457         g_topology_assert();
  458         gsp = gp->softc;
  459         /* Deny unmapped I/O and direct dispatch if hotspots are used. */
  460         if (gsp->nhotspot == 0) {
  461                 LIST_FOREACH(pp, &gp->provider, provider)
  462                         pp->flags &= ~(G_PF_ACCEPT_UNMAPPED |
  463                             G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE);
  464                 LIST_FOREACH(cp, &gp->consumer, consumer)
  465                         cp->flags &= ~(G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE);
  466         }
  467         gsl = gsp->hotspot;
  468         if(idx >= gsp->nhotspot) {
  469                 gsl2 = g_malloc((idx + 1) * sizeof *gsl2, M_WAITOK | M_ZERO);
  470                 if (gsp->hotspot != NULL)
  471                         bcopy(gsp->hotspot, gsl2, gsp->nhotspot * sizeof *gsl2);
  472                 gsp->hotspot = gsl2;
  473                 if (gsp->hotspot != NULL)
  474                         g_free(gsl);
  475                 gsl = gsl2;
  476                 gsp->nhotspot = idx + 1;
  477         }
  478         gsl[idx].offset = offset;
  479         gsl[idx].length = length;
  480         KASSERT(!((ract | dact | wact) & G_SLICE_HOT_START)
  481             || gsp->start != NULL, ("G_SLICE_HOT_START but no slice->start"));
  482         /* XXX: check that we _have_ a start function if HOT_START specified */
  483         gsl[idx].ract = ract;
  484         gsl[idx].dact = dact;
  485         gsl[idx].wact = wact;
  486         return (0);
  487 }
  488 
  489 void
  490 g_slice_orphan(struct g_consumer *cp)
  491 {
  492         struct g_geom *gp;
  493 
  494         g_topology_assert();
  495         gp = cp->geom;
  496         g_trace(G_T_TOPOLOGY, "%s(%p/%s)", __func__, cp, gp->name);
  497         g_wither_geom(gp, ENXIO);
  498 
  499         /*
  500          * We can safely free the softc now if there are no accesses,
  501          * otherwise g_slice_access() will do that after the last close.
  502          */
  503         if ((cp->acr + cp->acw + cp->ace) == 0)
  504                 g_slice_free(gp);
  505 }
  506 
  507 void
  508 g_slice_spoiled(struct g_consumer *cp)
  509 {
  510 
  511         g_trace(G_T_TOPOLOGY, "%s(%p/%s)", __func__, cp, cp->geom->name);
  512         cp->flags |= G_CF_ORPHAN;
  513         g_slice_orphan(cp);
  514 }
  515 
  516 int
  517 g_slice_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
  518 {
  519 
  520         g_slice_spoiled(LIST_FIRST(&gp->consumer));
  521         return (0);
  522 }
  523 
  524 struct g_geom *
  525 g_slice_new(struct g_class *mp, u_int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start)
  526 {
  527         struct g_geom *gp;
  528         struct g_slicer *gsp;
  529         struct g_consumer *cp;
  530         void **vp;
  531         int error;
  532 
  533         g_topology_assert();
  534         vp = (void **)extrap;
  535         gp = g_new_geomf(mp, "%s", pp->name);
  536         gsp = g_slice_alloc(slices, extra);
  537         gsp->start = start;
  538         gp->softc = gsp;
  539         gp->start = g_slice_start;
  540         gp->access = g_slice_access;
  541         gp->orphan = g_slice_orphan;
  542         gp->spoiled = g_slice_spoiled;
  543         if (gp->dumpconf == NULL)
  544                 gp->dumpconf = g_slice_dumpconf;
  545         if (gp->class->destroy_geom == NULL)
  546                 gp->class->destroy_geom = g_slice_destroy_geom;
  547         cp = g_new_consumer(gp);
  548         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
  549         error = g_attach(cp, pp);
  550         if (error == 0)
  551                 error = g_access(cp, 1, 0, 0);
  552         if (error) {
  553                 g_wither_geom(gp, ENXIO);
  554                 return (NULL);
  555         }
  556         if (extrap != NULL)
  557                 *vp = gsp->softc;
  558         *cpp = cp;
  559         return (gp);
  560 }

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