153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
/*-
|
|
* Copyright (c) 2004 Poul-Henning Kamp
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <geom/geom.h>
|
|
#include <geom/geom_vfs.h>
|
|
|
|
/*
|
|
* subroutines for use by filesystems.
|
|
*
|
|
* XXX: should maybe live somewhere else ?
|
|
*/
|
|
#include <sys/buf.h>
|
|
|
|
static struct buf_ops __g_vfs_bufops = {
|
|
.bop_name = "GEOM_VFS",
|
|
.bop_write = bufwrite,
|
|
.bop_strategy = g_vfs_strategy,
|
|
};
|
|
|
|
struct buf_ops *g_vfs_bufops = &__g_vfs_bufops;
|
|
|
|
static struct g_class g_vfs_class = {
|
|
.name = "VFS",
|
|
.version = G_VERSION,
|
|
.orphan = g_vfs_orphan,
|
|
};
|
|
|
|
DECLARE_GEOM_CLASS(g_vfs_class, g_vfs);
|
|
|
|
static void
|
|
g_vfs_done(struct bio *bip)
|
|
{
|
|
struct buf *bp;
|
|
|
|
if (bip->bio_error) {
|
|
printf("g_vfs_done():");
|
|
g_print_bio(bip);
|
|
printf("error = %d\n", bip->bio_error);
|
|
}
|
|
bp = bip->bio_caller2;
|
|
bp->b_error = bip->bio_error;
|
|
bp->b_ioflags = bip->bio_flags;
|
|
if (bip->bio_error)
|
|
bp->b_ioflags |= BIO_ERROR;
|
|
bp->b_resid = bp->b_bcount - bip->bio_completed;
|
|
g_destroy_bio(bip);
|
|
mtx_lock(&Giant);
|
|
bufdone(bp);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
|
|
void
|
|
g_vfs_strategy(struct bufobj *bo, struct buf *bp)
|
|
{
|
|
struct g_consumer *cp;
|
|
struct bio *bip;
|
|
|
|
cp = bo->bo_private;
|
|
G_VALID_CONSUMER(cp);
|
|
|
|
bip = g_alloc_bio();
|
|
bip->bio_cmd = bp->b_iocmd;
|
|
bip->bio_offset = bp->b_iooffset;
|
|
bip->bio_data = bp->b_data;
|
|
bip->bio_done = g_vfs_done;
|
|
bip->bio_caller2 = bp;
|
|
bip->bio_length = bp->b_bcount;
|
|
g_io_request(bip, cp);
|
|
}
|
|
|
|
void
|
|
g_vfs_orphan(struct g_consumer *cp)
|
|
{
|
|
|
|
/*
|
|
* Don't do anything here yet.
|
|
*
|
|
* Ideally we should detach the consumer already now, but that
|
|
* leads to a locking requirement in the I/O path to see if we have
|
|
* a consumer or not. Considering how ugly things are going to get
|
|
* anyway as none of our filesystems are graceful about i/o errors,
|
|
* this is not important right now.
|
|
*
|
|
* Down the road, this is the place where we could give the user
|
|
* a "Abort, Retry or Ignore" option to replace the media again.
|
|
*/
|
|
}
|
|
|
|
int
|
|
g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr)
|
|
{
|
|
struct g_geom *gp;
|
|
struct g_provider *pp;
|
|
struct g_consumer *cp;
|
|
struct bufobj *bo;
|
|
int error;
|
|
|
|
g_topology_assert();
|
|
|
|
*cpp = NULL;
|
|
pp = g_dev_getprovider(vp->v_rdev);
|
|
if (pp == NULL)
|
|
return (ENOENT);
|
|
gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name);
|
|
cp = g_new_consumer(gp);
|
|
g_attach(cp, pp);
|
|
error = g_access(cp, 1, wr, 1);
|
|
if (error) {
|
|
g_wither_geom(gp, ENXIO);
|
|
return (error);
|
|
}
|
|
*cpp = cp;
|
|
bo = &vp->v_bufobj;
|
|
bo->bo_ops = g_vfs_bufops;
|
|
bo->bo_private = cp;
|
|
bo->bo_bsize = pp->sectorsize;
|
|
|
|
return (error);
|
|
}
|