289 lines
6.8 KiB
C
289 lines
6.8 KiB
C
/*-
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* Copyright (c) 2004 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <geom/geom.h>
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#include <geom/geom_vfs.h>
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/*
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* subroutines for use by filesystems.
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*
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* XXX: should maybe live somewhere else ?
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*/
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#include <sys/buf.h>
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struct g_vfs_softc {
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struct mtx sc_mtx;
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struct bufobj *sc_bo;
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int sc_active;
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int sc_orphaned;
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};
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static struct buf_ops __g_vfs_bufops = {
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.bop_name = "GEOM_VFS",
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.bop_write = bufwrite,
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.bop_strategy = g_vfs_strategy,
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.bop_sync = bufsync,
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.bop_bdflush = bufbdflush
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};
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struct buf_ops *g_vfs_bufops = &__g_vfs_bufops;
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static g_orphan_t g_vfs_orphan;
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static struct g_class g_vfs_class = {
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.name = "VFS",
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.version = G_VERSION,
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.orphan = g_vfs_orphan,
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};
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DECLARE_GEOM_CLASS(g_vfs_class, g_vfs);
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static void
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g_vfs_destroy(void *arg, int flags __unused)
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{
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struct g_consumer *cp;
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g_topology_assert();
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cp = arg;
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if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
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g_access(cp, -cp->acr, -cp->acw, -cp->ace);
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g_detach(cp);
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if (cp->geom->softc == NULL)
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g_wither_geom(cp->geom, ENXIO);
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}
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static void
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g_vfs_done(struct bio *bip)
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{
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struct g_consumer *cp;
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struct g_vfs_softc *sc;
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struct buf *bp;
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int destroy;
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struct mount *mp;
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struct vnode *vp;
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struct cdev *cdevp;
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/*
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* Collect statistics on synchronous and asynchronous read
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* and write counts for disks that have associated filesystems.
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*/
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bp = bip->bio_caller2;
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vp = bp->b_vp;
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if (vp != NULL) {
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/*
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* If not a disk vnode, use its associated mount point
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* otherwise use the mountpoint associated with the disk.
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*/
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VI_LOCK(vp);
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if (vp->v_type != VCHR ||
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(cdevp = vp->v_rdev) == NULL ||
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cdevp->si_devsw == NULL ||
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(cdevp->si_devsw->d_flags & D_DISK) == 0)
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mp = vp->v_mount;
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else
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mp = cdevp->si_mountpt;
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if (mp != NULL) {
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if (bp->b_iocmd == BIO_READ) {
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if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
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mp->mnt_stat.f_asyncreads++;
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else
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mp->mnt_stat.f_syncreads++;
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} else if (bp->b_iocmd == BIO_WRITE) {
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if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
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mp->mnt_stat.f_asyncwrites++;
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else
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mp->mnt_stat.f_syncwrites++;
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}
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}
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VI_UNLOCK(vp);
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}
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cp = bip->bio_from;
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sc = cp->geom->softc;
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if (bip->bio_error) {
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printf("g_vfs_done():");
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g_print_bio(bip);
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printf("error = %d\n", bip->bio_error);
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}
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bp->b_error = bip->bio_error;
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bp->b_ioflags = bip->bio_flags;
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if (bip->bio_error)
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bp->b_ioflags |= BIO_ERROR;
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bp->b_resid = bp->b_bcount - bip->bio_completed;
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g_destroy_bio(bip);
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mtx_lock(&sc->sc_mtx);
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destroy = ((--sc->sc_active) == 0 && sc->sc_orphaned);
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mtx_unlock(&sc->sc_mtx);
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if (destroy)
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g_post_event(g_vfs_destroy, cp, M_WAITOK, NULL);
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bufdone(bp);
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}
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void
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g_vfs_strategy(struct bufobj *bo, struct buf *bp)
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{
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struct g_vfs_softc *sc;
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struct g_consumer *cp;
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struct bio *bip;
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cp = bo->bo_private;
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sc = cp->geom->softc;
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/*
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* If the provider has orphaned us, just return ENXIO.
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*/
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mtx_lock(&sc->sc_mtx);
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if (sc->sc_orphaned) {
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mtx_unlock(&sc->sc_mtx);
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bp->b_error = ENXIO;
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bp->b_ioflags |= BIO_ERROR;
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bufdone(bp);
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return;
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}
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sc->sc_active++;
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mtx_unlock(&sc->sc_mtx);
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bip = g_alloc_bio();
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bip->bio_cmd = bp->b_iocmd;
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bip->bio_offset = bp->b_iooffset;
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bip->bio_length = bp->b_bcount;
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bdata2bio(bp, bip);
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if ((bp->b_flags & B_BARRIER) != 0) {
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bip->bio_flags |= BIO_ORDERED;
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bp->b_flags &= ~B_BARRIER;
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}
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bip->bio_done = g_vfs_done;
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bip->bio_caller2 = bp;
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#if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
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buf_track(bp, __func__);
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bip->bio_track_bp = bp;
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#endif
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g_io_request(bip, cp);
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}
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static void
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g_vfs_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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struct g_vfs_softc *sc;
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int destroy;
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g_topology_assert();
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gp = cp->geom;
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g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name);
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sc = gp->softc;
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if (sc == NULL)
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return;
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mtx_lock(&sc->sc_mtx);
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sc->sc_orphaned = 1;
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destroy = (sc->sc_active == 0);
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mtx_unlock(&sc->sc_mtx);
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if (destroy)
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g_vfs_destroy(cp, 0);
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/*
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* Do not destroy the geom. Filesystem will do that during unmount.
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*/
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}
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int
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g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr)
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{
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struct g_geom *gp;
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struct g_provider *pp;
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struct g_consumer *cp;
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struct g_vfs_softc *sc;
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struct bufobj *bo;
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int error;
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g_topology_assert();
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*cpp = NULL;
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bo = &vp->v_bufobj;
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if (bo->bo_private != vp)
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return (EBUSY);
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pp = g_dev_getprovider(vp->v_rdev);
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if (pp == NULL)
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return (ENOENT);
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gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name);
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sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
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mtx_init(&sc->sc_mtx, "g_vfs", NULL, MTX_DEF);
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sc->sc_bo = bo;
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gp->softc = sc;
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cp = g_new_consumer(gp);
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g_attach(cp, pp);
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error = g_access(cp, 1, wr, wr);
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if (error) {
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g_wither_geom(gp, ENXIO);
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return (error);
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}
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vnode_create_vobject(vp, pp->mediasize, curthread);
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*cpp = cp;
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cp->private = vp;
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cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
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bo->bo_ops = g_vfs_bufops;
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bo->bo_private = cp;
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bo->bo_bsize = pp->sectorsize;
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return (error);
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}
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void
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g_vfs_close(struct g_consumer *cp)
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{
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struct g_geom *gp;
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struct g_vfs_softc *sc;
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g_topology_assert();
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gp = cp->geom;
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sc = gp->softc;
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bufobj_invalbuf(sc->sc_bo, V_SAVE, 0, 0);
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sc->sc_bo->bo_private = cp->private;
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gp->softc = NULL;
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mtx_destroy(&sc->sc_mtx);
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if (!sc->sc_orphaned || cp->provider == NULL)
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g_wither_geom_close(gp, ENXIO);
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g_free(sc);
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}
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