aboutsummaryrefslogtreecommitdiff
path: root/sys/geom/geom_vfs.c
blob: bff516b561247ddf2a849895d2de66ed9a5c9a93 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/*-
 * 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 <sys/mount.h>	/* XXX Temporary for VFS_LOCK_GIANT */

#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,	
	.bop_sync =	bufsync,	
};

struct buf_ops *g_vfs_bufops = &__g_vfs_bufops;

static g_orphan_t g_vfs_orphan;

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;
	int vfslocked;

	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);
	vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL));
	bufdone(bp);
	VFS_UNLOCK_GIANT(vfslocked);
}

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);
}

static 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 vfslocked;
	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);
	}
	vfslocked = VFS_LOCK_GIANT(vp->v_mount);
	vnode_create_vobject(vp, pp->mediasize, curthread);
	VFS_UNLOCK_GIANT(vfslocked);
	*cpp = cp;
	bo = &vp->v_bufobj;
	bo->bo_ops = g_vfs_bufops;
	bo->bo_private = cp;
	bo->bo_bsize = pp->sectorsize;
	gp->softc = bo;

	return (error);
}

void
g_vfs_close(struct g_consumer *cp, struct thread *td)
{
	struct g_geom *gp;
	struct bufobj *bo;

	g_topology_assert();

	gp = cp->geom;
	bo = gp->softc;
	bufobj_invalbuf(bo, V_SAVE, td, 0, 0);
	g_wither_geom_close(gp, ENXIO);
}