FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_vfs.c
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: src/sys/geom/geom_vfs.c,v 1.12 2008/10/10 21:23:50 attilio Exp $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bio.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
35 #include <sys/vnode.h>
36 #include <sys/mount.h> /* XXX Temporary for VFS_LOCK_GIANT */
37
38 #include <geom/geom.h>
39 #include <geom/geom_vfs.h>
40
41 /*
42 * subroutines for use by filesystems.
43 *
44 * XXX: should maybe live somewhere else ?
45 */
46 #include <sys/buf.h>
47
48 static struct buf_ops __g_vfs_bufops = {
49 .bop_name = "GEOM_VFS",
50 .bop_write = bufwrite,
51 .bop_strategy = g_vfs_strategy,
52 .bop_sync = bufsync,
53 .bop_bdflush = bufbdflush
54 };
55
56 struct buf_ops *g_vfs_bufops = &__g_vfs_bufops;
57
58 static g_orphan_t g_vfs_orphan;
59
60 static struct g_class g_vfs_class = {
61 .name = "VFS",
62 .version = G_VERSION,
63 .orphan = g_vfs_orphan,
64 };
65
66 DECLARE_GEOM_CLASS(g_vfs_class, g_vfs);
67
68 static void
69 g_vfs_done(struct bio *bip)
70 {
71 struct buf *bp;
72 int vfslocked;
73
74 if (bip->bio_error) {
75 printf("g_vfs_done():");
76 g_print_bio(bip);
77 printf("error = %d\n", bip->bio_error);
78 }
79 bp = bip->bio_caller2;
80 bp->b_error = bip->bio_error;
81 bp->b_ioflags = bip->bio_flags;
82 if (bip->bio_error)
83 bp->b_ioflags |= BIO_ERROR;
84 bp->b_resid = bp->b_bcount - bip->bio_completed;
85 g_destroy_bio(bip);
86 vfslocked = VFS_LOCK_GIANT(((struct mount *)NULL));
87 bufdone(bp);
88 VFS_UNLOCK_GIANT(vfslocked);
89 }
90
91 void
92 g_vfs_strategy(struct bufobj *bo, struct buf *bp)
93 {
94 struct g_consumer *cp;
95 struct bio *bip;
96
97 cp = bo->bo_private;
98 G_VALID_CONSUMER(cp);
99
100 bip = g_alloc_bio();
101 bip->bio_cmd = bp->b_iocmd;
102 bip->bio_offset = bp->b_iooffset;
103 bip->bio_data = bp->b_data;
104 bip->bio_done = g_vfs_done;
105 bip->bio_caller2 = bp;
106 bip->bio_length = bp->b_bcount;
107 g_io_request(bip, cp);
108 }
109
110 static void
111 g_vfs_orphan(struct g_consumer *cp)
112 {
113
114 /*
115 * Don't do anything here yet.
116 *
117 * Ideally we should detach the consumer already now, but that
118 * leads to a locking requirement in the I/O path to see if we have
119 * a consumer or not. Considering how ugly things are going to get
120 * anyway as none of our filesystems are graceful about i/o errors,
121 * this is not important right now.
122 *
123 * Down the road, this is the place where we could give the user
124 * a "Abort, Retry or Ignore" option to replace the media again.
125 */
126 }
127
128 int
129 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr)
130 {
131 struct g_geom *gp;
132 struct g_provider *pp;
133 struct g_consumer *cp;
134 struct bufobj *bo;
135 int vfslocked;
136 int error;
137
138 g_topology_assert();
139
140 *cpp = NULL;
141 pp = g_dev_getprovider(vp->v_rdev);
142 if (pp == NULL)
143 return (ENOENT);
144 gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name);
145 cp = g_new_consumer(gp);
146 g_attach(cp, pp);
147 error = g_access(cp, 1, wr, 1);
148 if (error) {
149 g_wither_geom(gp, ENXIO);
150 return (error);
151 }
152 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
153 vnode_create_vobject(vp, pp->mediasize, curthread);
154 VFS_UNLOCK_GIANT(vfslocked);
155 *cpp = cp;
156 bo = &vp->v_bufobj;
157 bo->bo_ops = g_vfs_bufops;
158 bo->bo_private = cp;
159 bo->bo_bsize = pp->sectorsize;
160 gp->softc = bo;
161
162 return (error);
163 }
164
165 void
166 g_vfs_close(struct g_consumer *cp)
167 {
168 struct g_geom *gp;
169 struct bufobj *bo;
170
171 g_topology_assert();
172
173 gp = cp->geom;
174 bo = gp->softc;
175 bufobj_invalbuf(bo, V_SAVE, 0, 0);
176 g_wither_geom_close(gp, ENXIO);
177 }
178
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