Add GEOM class "VFS" for filesystems and other buffer cache users
of GEOM devices. There is nothing magic about this, it just gives a bufobj interface to GEOM.
This commit is contained in:
Poul-Henning Kamp
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e1f355fe4e
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4d13ab3da2
@ -967,6 +967,7 @@ geom/geom_slice.c standard
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geom/geom_subr.c standard
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geom/geom_sunlabel.c optional geom_sunlabel
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geom/geom_sunlabel_enc.c optional geom_sunlabel
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geom/geom_vfs.c standard
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geom/geom_vol_ffs.c optional geom_vol
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gnu/ext2fs/ext2_alloc.c optional ext2fs \
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warning "kernel contains GPL contaminated ext2fs filesystem"
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152
sys/geom/geom_vfs.c
Normal file
152
sys/geom/geom_vfs.c
Normal file
@ -0,0 +1,152 @@
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/*-
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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/malloc.h>
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#include <sys/vnode.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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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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};
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struct buf_ops *g_vfs_bufops = &__g_vfs_bufops;
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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_done(struct bio *bip)
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{
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struct buf *bp;
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if (bip->bio_error) {
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printf("ffs_geom_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 = bip->bio_caller2;
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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(&Giant);
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bufdone(bp);
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mtx_unlock(&Giant);
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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_consumer *cp;
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struct bio *bip;
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cp = bo->bo_private;
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G_VALID_CONSUMER(cp);
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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_data = bp->b_data;
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bip->bio_done = g_vfs_done;
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bip->bio_caller2 = bp;
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bip->bio_length = bp->b_bcount;
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g_io_request(bip, cp);
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}
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void
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g_vfs_orphan(struct g_consumer *cp)
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{
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/*
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* Don't do anything here yet.
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*
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* Ideally we should detach the consumer already now, but that
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* leads to a locking requirement in the I/O path to see if we have
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* a consumer or not. Considering how ugly things are going to get
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* anyway as none of our filesystems are graceful about i/o errors,
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* this is not important right now.
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*
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* Down the road, this is the place where we could give the user
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* a "Abort, Retry or Ignore" option to replace the media again.
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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 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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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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cp = g_new_consumer(gp);
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g_attach(cp, pp);
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error = g_access(cp, 1, wr, 1);
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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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*cpp = cp;
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bo = &vp->v_bufobj;
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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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42
sys/geom/geom_vfs.h
Normal file
42
sys/geom/geom_vfs.h
Normal file
@ -0,0 +1,42 @@
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/*-
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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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* $FreeBSD$
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*/
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#ifndef _GEOM_GEOM_VFS_H_
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#define _GEOM_GEOM_VFS_H_
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struct vnode;
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struct bufobj;
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struct buf;
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extern struct buf_ops *g_vfs_bufops;
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void g_vfs_strategy(struct bufobj *bo, struct buf *bp);
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void g_vfs_orphan(struct g_consumer *cp);
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int g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr);
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#endif /* _GEOM_GEOM_VFS_H_ */
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