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: stable/10/sys/geom/geom_vfs.c 260385 2014-01-07 01:32:23Z scottl $");
   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          */
  106         bp = bip->bio_caller2;
  107         vp = bp->b_vp;
  108         if (vp != NULL) {
  109                 /*
  110                  * If not a disk vnode, use its associated mount point
  111                  * otherwise use the mountpoint associated with the disk.
  112                  */
  113                 VI_LOCK(vp);
  114                 if (vp->v_type != VCHR ||
  115                     (cdevp = vp->v_rdev) == NULL ||
  116                     cdevp->si_devsw == NULL ||
  117                     (cdevp->si_devsw->d_flags & D_DISK) == 0)
  118                         mp = vp->v_mount;
  119                 else
  120                         mp = cdevp->si_mountpt;
  121                 if (mp != NULL) {
  122                         if (bp->b_iocmd == BIO_READ) {
  123                                 if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
  124                                         mp->mnt_stat.f_asyncreads++;
  125                                 else
  126                                         mp->mnt_stat.f_syncreads++;
  127                         } else if (bp->b_iocmd == BIO_WRITE) {
  128                                 if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
  129                                         mp->mnt_stat.f_asyncwrites++;
  130                                 else
  131                                         mp->mnt_stat.f_syncwrites++;
  132                         }
  133                 }
  134                 VI_UNLOCK(vp);
  135         }
  136 
  137         cp = bip->bio_from;
  138         sc = cp->geom->softc;
  139         if (bip->bio_error) {
  140                 printf("g_vfs_done():");
  141                 g_print_bio(bip);
  142                 printf("error = %d\n", bip->bio_error);
  143         }
  144         bp->b_error = bip->bio_error;
  145         bp->b_ioflags = bip->bio_flags;
  146         if (bip->bio_error)
  147                 bp->b_ioflags |= BIO_ERROR;
  148         bp->b_resid = bp->b_bcount - bip->bio_completed;
  149         g_destroy_bio(bip);
  150 
  151         mtx_lock(&sc->sc_mtx);
  152         destroy = ((--sc->sc_active) == 0 && sc->sc_orphaned);
  153         mtx_unlock(&sc->sc_mtx);
  154         if (destroy)
  155                 g_post_event(g_vfs_destroy, cp, M_WAITOK, NULL);
  156 
  157         bufdone(bp);
  158 }
  159 
  160 void
  161 g_vfs_strategy(struct bufobj *bo, struct buf *bp)
  162 {
  163         struct g_vfs_softc *sc;
  164         struct g_consumer *cp;
  165         struct bio *bip;
  166 
  167         cp = bo->bo_private;
  168         sc = cp->geom->softc;
  169 
  170         /*
  171          * If the provider has orphaned us, just return EXIO.
  172          */
  173         mtx_lock(&sc->sc_mtx);
  174         if (sc->sc_orphaned) {
  175                 mtx_unlock(&sc->sc_mtx);
  176                 bp->b_error = ENXIO;
  177                 bp->b_ioflags |= BIO_ERROR;
  178                 bufdone(bp);
  179                 return;
  180         }
  181         sc->sc_active++;
  182         mtx_unlock(&sc->sc_mtx);
  183 
  184         bip = g_alloc_bio();
  185         bip->bio_cmd = bp->b_iocmd;
  186         bip->bio_offset = bp->b_iooffset;
  187         bip->bio_length = bp->b_bcount;
  188         bdata2bio(bp, bip);
  189         if ((bp->b_flags & B_BARRIER) != 0) {
  190                 bip->bio_flags |= BIO_ORDERED;
  191                 bp->b_flags &= ~B_BARRIER;
  192         }
  193         bip->bio_done = g_vfs_done;
  194         bip->bio_caller2 = bp;
  195         g_io_request(bip, cp);
  196 }
  197 
  198 static void
  199 g_vfs_orphan(struct g_consumer *cp)
  200 {
  201         struct g_geom *gp;
  202         struct g_vfs_softc *sc;
  203         int destroy;
  204 
  205         g_topology_assert();
  206 
  207         gp = cp->geom;
  208         g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name);
  209         sc = gp->softc;
  210         if (sc == NULL)
  211                 return;
  212         mtx_lock(&sc->sc_mtx);
  213         sc->sc_orphaned = 1;
  214         destroy = (sc->sc_active == 0);
  215         mtx_unlock(&sc->sc_mtx);
  216         if (destroy)
  217                 g_vfs_destroy(cp, 0);
  218 
  219         /*
  220          * Do not destroy the geom.  Filesystem will do that during unmount.
  221          */
  222 }
  223 
  224 int
  225 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr)
  226 {
  227         struct g_geom *gp;
  228         struct g_provider *pp;
  229         struct g_consumer *cp;
  230         struct g_vfs_softc *sc;
  231         struct bufobj *bo;
  232         int error;
  233 
  234         g_topology_assert();
  235 
  236         *cpp = NULL;
  237         bo = &vp->v_bufobj;
  238         if (bo->bo_private != vp)
  239                 return (EBUSY);
  240 
  241         pp = g_dev_getprovider(vp->v_rdev);
  242         if (pp == NULL)
  243                 return (ENOENT);
  244         gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name);
  245         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
  246         mtx_init(&sc->sc_mtx, "g_vfs", NULL, MTX_DEF);
  247         sc->sc_bo = bo;
  248         gp->softc = sc;
  249         cp = g_new_consumer(gp);
  250         g_attach(cp, pp);
  251         error = g_access(cp, 1, wr, wr);
  252         if (error) {
  253                 g_wither_geom(gp, ENXIO);
  254                 return (error);
  255         }
  256         vnode_create_vobject(vp, pp->mediasize, curthread);
  257         *cpp = cp;
  258         cp->private = vp;
  259         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
  260         bo->bo_ops = g_vfs_bufops;
  261         bo->bo_private = cp;
  262         bo->bo_bsize = pp->sectorsize;
  263 
  264         return (error);
  265 }
  266 
  267 void
  268 g_vfs_close(struct g_consumer *cp)
  269 {
  270         struct g_geom *gp;
  271         struct g_vfs_softc *sc;
  272 
  273         g_topology_assert();
  274 
  275         gp = cp->geom;
  276         sc = gp->softc;
  277         bufobj_invalbuf(sc->sc_bo, V_SAVE, 0, 0);
  278         sc->sc_bo->bo_private = cp->private;
  279         gp->softc = NULL;
  280         mtx_destroy(&sc->sc_mtx);
  281         if (!sc->sc_orphaned || cp->provider == NULL)
  282                 g_wither_geom_close(gp, ENXIO);
  283         g_free(sc);
  284 }

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