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("$FreeBSD$");
   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>  /* XXX Temporary for VFS_LOCK_GIANT */
   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 vfslocked, destroy;
   98         struct mount *mp;
   99         struct vnode *vp;
  100         struct cdev *cdevp;
  101 
  102         cp = bip->bio_from;
  103         sc = cp->geom->softc;
  104         /*
  105          * Collect statistics on synchronous and asynchronous read
  106          * and write counts for disks that have associated filesystems.
  107          * Since this is run by the g_up thread it is single threaded and
  108          * we do not need to use atomic increments on the counters.
  109          */
  110         bp = bip->bio_caller2;
  111         vp = bp->b_vp;
  112         if (vp == NULL) {
  113                 mp = NULL;
  114         } else {
  115                 /*
  116                  * If not a disk vnode, use its associated mount point
  117                  * otherwise use the mountpoint associated with the disk.
  118                  */
  119                 VI_LOCK(vp);
  120                 if (vp->v_type != VCHR ||
  121                     (cdevp = vp->v_rdev) == NULL ||
  122                     cdevp->si_devsw == NULL ||
  123                     (cdevp->si_devsw->d_flags & D_DISK) == 0)
  124                         mp = vp->v_mount;
  125                 else
  126                         mp = cdevp->si_mountpt;
  127                 VI_UNLOCK(vp);
  128         }
  129         if (mp != NULL) {
  130                 if (bp->b_iocmd == BIO_WRITE) {
  131                         if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
  132                                 mp->mnt_stat.f_asyncwrites++;
  133                         else
  134                                 mp->mnt_stat.f_syncwrites++;
  135                 } else {
  136                         if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
  137                                 mp->mnt_stat.f_asyncreads++;
  138                         else
  139                                 mp->mnt_stat.f_syncreads++;
  140                 }
  141         }
  142 
  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         vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL));
  162         bufdone(bp);
  163         VFS_UNLOCK_GIANT(vfslocked);
  164 }
  165 
  166 void
  167 g_vfs_strategy(struct bufobj *bo, struct buf *bp)
  168 {
  169         struct g_vfs_softc *sc;
  170         struct g_consumer *cp;
  171         struct bio *bip;
  172         int vfslocked;
  173 
  174         cp = bo->bo_private;
  175         sc = cp->geom->softc;
  176 
  177         /*
  178          * If the provider has orphaned us, just return EXIO.
  179          */
  180         mtx_lock(&sc->sc_mtx);
  181         if (sc->sc_orphaned) {
  182                 mtx_unlock(&sc->sc_mtx);
  183                 bp->b_error = ENXIO;
  184                 bp->b_ioflags |= BIO_ERROR;
  185                 vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL));
  186                 bufdone(bp);
  187                 VFS_UNLOCK_GIANT(vfslocked);
  188                 return;
  189         }
  190         sc->sc_active++;
  191         mtx_unlock(&sc->sc_mtx);
  192 
  193         bip = g_alloc_bio();
  194         bip->bio_cmd = bp->b_iocmd;
  195         bip->bio_offset = bp->b_iooffset;
  196         bip->bio_length = bp->b_bcount;
  197         bdata2bio(bp, bip);
  198         if ((bp->b_flags & B_BARRIER) != 0) {
  199                 bip->bio_flags |= BIO_ORDERED;
  200                 bp->b_flags &= ~B_BARRIER;
  201         }
  202         bip->bio_done = g_vfs_done;
  203         bip->bio_caller2 = bp;
  204         g_io_request(bip, cp);
  205 }
  206 
  207 static void
  208 g_vfs_orphan(struct g_consumer *cp)
  209 {
  210         struct g_geom *gp;
  211         struct g_vfs_softc *sc;
  212         int destroy;
  213 
  214         g_topology_assert();
  215 
  216         gp = cp->geom;
  217         g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name);
  218         sc = gp->softc;
  219         if (sc == NULL)
  220                 return;
  221         mtx_lock(&sc->sc_mtx);
  222         sc->sc_orphaned = 1;
  223         destroy = (sc->sc_active == 0);
  224         mtx_unlock(&sc->sc_mtx);
  225         if (destroy)
  226                 g_vfs_destroy(cp, 0);
  227 
  228         /*
  229          * Do not destroy the geom.  Filesystem will do that during unmount.
  230          */
  231 }
  232 
  233 int
  234 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr)
  235 {
  236         struct g_geom *gp;
  237         struct g_provider *pp;
  238         struct g_consumer *cp;
  239         struct g_vfs_softc *sc;
  240         struct bufobj *bo;
  241         int vfslocked;
  242         int error;
  243 
  244         g_topology_assert();
  245 
  246         *cpp = NULL;
  247         bo = &vp->v_bufobj;
  248         if (bo->bo_private != vp)
  249                 return (EBUSY);
  250 
  251         pp = g_dev_getprovider(vp->v_rdev);
  252         if (pp == NULL)
  253                 return (ENOENT);
  254         gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name);
  255         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
  256         mtx_init(&sc->sc_mtx, "g_vfs", NULL, MTX_DEF);
  257         sc->sc_bo = bo;
  258         gp->softc = sc;
  259         cp = g_new_consumer(gp);
  260         g_attach(cp, pp);
  261         error = g_access(cp, 1, wr, wr);
  262         if (error) {
  263                 g_wither_geom(gp, ENXIO);
  264                 return (error);
  265         }
  266         vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  267         vnode_create_vobject(vp, pp->mediasize, curthread);
  268         VFS_UNLOCK_GIANT(vfslocked);
  269         *cpp = cp;
  270         cp->private = vp;
  271         bo->bo_ops = g_vfs_bufops;
  272         bo->bo_private = cp;
  273         bo->bo_bsize = pp->sectorsize;
  274 
  275         return (error);
  276 }
  277 
  278 void
  279 g_vfs_close(struct g_consumer *cp)
  280 {
  281         struct g_geom *gp;
  282         struct g_vfs_softc *sc;
  283 
  284         g_topology_assert();
  285 
  286         gp = cp->geom;
  287         sc = gp->softc;
  288         bufobj_invalbuf(sc->sc_bo, V_SAVE, 0, 0);
  289         sc->sc_bo->bo_private = cp->private;
  290         gp->softc = NULL;
  291         mtx_destroy(&sc->sc_mtx);
  292         if (!sc->sc_orphaned || cp->provider == NULL)
  293                 g_wither_geom_close(gp, ENXIO);
  294         g_free(sc);
  295 }

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

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