The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_vfs.c

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    1 /*-
    2  * Copyright (c) 2004 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.0/sys/geom/geom_vfs.c 248508 2013-03-19 14:13:12Z kib $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bio.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mutex.h>
   37 #include <sys/vnode.h>
   38 #include <sys/mount.h>
   39 
   40 #include <geom/geom.h>
   41 #include <geom/geom_vfs.h>
   42 
   43 /*
   44  * subroutines for use by filesystems.
   45  *
   46  * XXX: should maybe live somewhere else ?
   47  */
   48 #include <sys/buf.h>
   49 
   50 struct g_vfs_softc {
   51         struct mtx       sc_mtx;
   52         struct bufobj   *sc_bo;
   53         int              sc_active;
   54         int              sc_orphaned;
   55 };
   56 
   57 static struct buf_ops __g_vfs_bufops = {
   58         .bop_name =     "GEOM_VFS",
   59         .bop_write =    bufwrite,
   60         .bop_strategy = g_vfs_strategy, 
   61         .bop_sync =     bufsync,        
   62         .bop_bdflush =  bufbdflush
   63 };
   64 
   65 struct buf_ops *g_vfs_bufops = &__g_vfs_bufops;
   66 
   67 static g_orphan_t g_vfs_orphan;
   68 
   69 static struct g_class g_vfs_class = {
   70         .name =         "VFS",
   71         .version =      G_VERSION,
   72         .orphan =       g_vfs_orphan,
   73 };
   74 
   75 DECLARE_GEOM_CLASS(g_vfs_class, g_vfs);
   76 
   77 static void
   78 g_vfs_destroy(void *arg, int flags __unused)
   79 {
   80         struct g_consumer *cp;
   81 
   82         g_topology_assert();
   83         cp = arg;
   84         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
   85                 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
   86         g_detach(cp);
   87         if (cp->geom->softc == NULL)
   88                 g_wither_geom(cp->geom, ENXIO);
   89 }
   90 
   91 static void
   92 g_vfs_done(struct bio *bip)
   93 {
   94         struct g_consumer *cp;
   95         struct g_vfs_softc *sc;
   96         struct buf *bp;
   97         int destroy;
   98         struct mount *mp;
   99         struct vnode *vp;
  100         struct cdev *cdevp;
  101 
  102         /*
  103          * Collect statistics on synchronous and asynchronous read
  104          * and write counts for disks that have associated filesystems.
  105          * Since this run by the g_up thread it is single threaded and
  106          * we do not need to use atomic increments on the counters.
  107          */
  108         bp = bip->bio_caller2;
  109         vp = bp->b_vp;
  110         if (vp == NULL) {
  111                 mp = NULL;
  112         } else {
  113                 /*
  114                  * If not a disk vnode, use its associated mount point
  115                  * otherwise use the mountpoint associated with the disk.
  116                  */
  117                 VI_LOCK(vp);
  118                 if (vp->v_type != VCHR ||
  119                     (cdevp = vp->v_rdev) == NULL ||
  120                     cdevp->si_devsw == NULL ||
  121                     (cdevp->si_devsw->d_flags & D_DISK) == 0)
  122                         mp = vp->v_mount;
  123                 else
  124                         mp = cdevp->si_mountpt;
  125                 VI_UNLOCK(vp);
  126         }
  127         if (mp != NULL) {
  128                 if (bp->b_iocmd == BIO_WRITE) {
  129                         if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
  130                                 mp->mnt_stat.f_asyncwrites++;
  131                         else
  132                                 mp->mnt_stat.f_syncwrites++;
  133                 } else {
  134                         if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
  135                                 mp->mnt_stat.f_asyncreads++;
  136                         else
  137                                 mp->mnt_stat.f_syncreads++;
  138                 }
  139         }
  140 
  141         cp = bip->bio_from;
  142         sc = cp->geom->softc;
  143         if (bip->bio_error) {
  144                 printf("g_vfs_done():");
  145                 g_print_bio(bip);
  146                 printf("error = %d\n", bip->bio_error);
  147         }
  148         bp->b_error = bip->bio_error;
  149         bp->b_ioflags = bip->bio_flags;
  150         if (bip->bio_error)
  151                 bp->b_ioflags |= BIO_ERROR;
  152         bp->b_resid = bp->b_bcount - bip->bio_completed;
  153         g_destroy_bio(bip);
  154 
  155         mtx_lock(&sc->sc_mtx);
  156         destroy = ((--sc->sc_active) == 0 && sc->sc_orphaned);
  157         mtx_unlock(&sc->sc_mtx);
  158         if (destroy)
  159                 g_post_event(g_vfs_destroy, cp, M_WAITOK, NULL);
  160 
  161         bufdone(bp);
  162 }
  163 
  164 void
  165 g_vfs_strategy(struct bufobj *bo, struct buf *bp)
  166 {
  167         struct g_vfs_softc *sc;
  168         struct g_consumer *cp;
  169         struct bio *bip;
  170 
  171         cp = bo->bo_private;
  172         sc = cp->geom->softc;
  173 
  174         /*
  175          * If the provider has orphaned us, just return EXIO.
  176          */
  177         mtx_lock(&sc->sc_mtx);
  178         if (sc->sc_orphaned) {
  179                 mtx_unlock(&sc->sc_mtx);
  180                 bp->b_error = ENXIO;
  181                 bp->b_ioflags |= BIO_ERROR;
  182                 bufdone(bp);
  183                 return;
  184         }
  185         sc->sc_active++;
  186         mtx_unlock(&sc->sc_mtx);
  187 
  188         bip = g_alloc_bio();
  189         bip->bio_cmd = bp->b_iocmd;
  190         bip->bio_offset = bp->b_iooffset;
  191         bip->bio_length = bp->b_bcount;
  192         bdata2bio(bp, bip);
  193         if ((bp->b_flags & B_BARRIER) != 0) {
  194                 bip->bio_flags |= BIO_ORDERED;
  195                 bp->b_flags &= ~B_BARRIER;
  196         }
  197         bip->bio_done = g_vfs_done;
  198         bip->bio_caller2 = bp;
  199         g_io_request(bip, cp);
  200 }
  201 
  202 static void
  203 g_vfs_orphan(struct g_consumer *cp)
  204 {
  205         struct g_geom *gp;
  206         struct g_vfs_softc *sc;
  207         int destroy;
  208 
  209         g_topology_assert();
  210 
  211         gp = cp->geom;
  212         g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name);
  213         sc = gp->softc;
  214         if (sc == NULL)
  215                 return;
  216         mtx_lock(&sc->sc_mtx);
  217         sc->sc_orphaned = 1;
  218         destroy = (sc->sc_active == 0);
  219         mtx_unlock(&sc->sc_mtx);
  220         if (destroy)
  221                 g_vfs_destroy(cp, 0);
  222 
  223         /*
  224          * Do not destroy the geom.  Filesystem will do that during unmount.
  225          */
  226 }
  227 
  228 int
  229 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr)
  230 {
  231         struct g_geom *gp;
  232         struct g_provider *pp;
  233         struct g_consumer *cp;
  234         struct g_vfs_softc *sc;
  235         struct bufobj *bo;
  236         int error;
  237 
  238         g_topology_assert();
  239 
  240         *cpp = NULL;
  241         bo = &vp->v_bufobj;
  242         if (bo->bo_private != vp)
  243                 return (EBUSY);
  244 
  245         pp = g_dev_getprovider(vp->v_rdev);
  246         if (pp == NULL)
  247                 return (ENOENT);
  248         gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name);
  249         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
  250         mtx_init(&sc->sc_mtx, "g_vfs", NULL, MTX_DEF);
  251         sc->sc_bo = bo;
  252         gp->softc = sc;
  253         cp = g_new_consumer(gp);
  254         g_attach(cp, pp);
  255         error = g_access(cp, 1, wr, wr);
  256         if (error) {
  257                 g_wither_geom(gp, ENXIO);
  258                 return (error);
  259         }
  260         vnode_create_vobject(vp, pp->mediasize, curthread);
  261         *cpp = cp;
  262         cp->private = vp;
  263         bo->bo_ops = g_vfs_bufops;
  264         bo->bo_private = cp;
  265         bo->bo_bsize = pp->sectorsize;
  266 
  267         return (error);
  268 }
  269 
  270 void
  271 g_vfs_close(struct g_consumer *cp)
  272 {
  273         struct g_geom *gp;
  274         struct g_vfs_softc *sc;
  275 
  276         g_topology_assert();
  277 
  278         gp = cp->geom;
  279         sc = gp->softc;
  280         bufobj_invalbuf(sc->sc_bo, V_SAVE, 0, 0);
  281         sc->sc_bo->bo_private = cp->private;
  282         gp->softc = NULL;
  283         mtx_destroy(&sc->sc_mtx);
  284         if (!sc->sc_orphaned || cp->provider == NULL)
  285                 g_wither_geom_close(gp, ENXIO);
  286         g_free(sc);
  287 }

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