2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004 Poul-Henning Kamp
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
40 #include <sys/vnode.h>
41 #include <sys/mount.h>
43 #include <geom/geom.h>
44 #include <geom/geom_vfs.h>
47 * subroutines for use by filesystems.
49 * XXX: should maybe live somewhere else ?
56 struct g_event *sc_event;
62 static struct buf_ops __g_vfs_bufops = {
63 .bop_name = "GEOM_VFS",
64 .bop_write = bufwrite,
65 .bop_strategy = g_vfs_strategy,
67 .bop_bdflush = bufbdflush
70 struct buf_ops *g_vfs_bufops = &__g_vfs_bufops;
72 static g_orphan_t g_vfs_orphan;
74 static struct g_class g_vfs_class = {
77 .orphan = g_vfs_orphan,
80 DECLARE_GEOM_CLASS(g_vfs_class, g_vfs);
83 g_vfs_destroy(void *arg, int flags __unused)
85 struct g_consumer *cp;
89 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
90 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
92 if (cp->geom->softc == NULL)
93 g_wither_geom(cp->geom, ENXIO);
97 g_vfs_done(struct bio *bip)
99 struct g_consumer *cp;
100 struct g_event *event;
101 struct g_vfs_softc *sc;
109 * Collect statistics on synchronous and asynchronous read
110 * and write counts for disks that have associated filesystems.
112 bp = bip->bio_caller2;
116 * If not a disk vnode, use its associated mount point
117 * otherwise use the mountpoint associated with the disk.
120 if (vp->v_type != VCHR ||
121 (cdevp = vp->v_rdev) == NULL ||
122 cdevp->si_devsw == NULL ||
123 (cdevp->si_devsw->d_flags & D_DISK) == 0)
126 mp = cdevp->si_mountpt;
128 if (bp->b_iocmd == BIO_READ) {
129 if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
130 mp->mnt_stat.f_asyncreads++;
132 mp->mnt_stat.f_syncreads++;
133 } else if (bp->b_iocmd == BIO_WRITE) {
134 if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
135 mp->mnt_stat.f_asyncwrites++;
137 mp->mnt_stat.f_syncwrites++;
144 sc = cp->geom->softc;
145 if (bip->bio_error != 0 && bip->bio_error != EOPNOTSUPP) {
146 if ((bp->b_xflags & BX_CVTENXIO) != 0)
147 sc->sc_enxio_active = 1;
148 if (sc->sc_enxio_active)
149 bip->bio_error = ENXIO;
150 g_print_bio("g_vfs_done():", bip, "error = %d",
153 bp->b_error = bip->bio_error;
154 bp->b_ioflags = bip->bio_flags;
156 bp->b_ioflags |= BIO_ERROR;
157 bp->b_resid = bp->b_bcount - bip->bio_completed;
160 mtx_lock(&sc->sc_mtx);
161 destroy = ((--sc->sc_active) == 0 && sc->sc_orphaned);
163 event = sc->sc_event;
167 mtx_unlock(&sc->sc_mtx);
169 g_post_event_ep(g_vfs_destroy, cp, event, NULL);
175 g_vfs_strategy(struct bufobj *bo, struct buf *bp)
177 struct g_vfs_softc *sc;
178 struct g_consumer *cp;
182 sc = cp->geom->softc;
185 * If the provider has orphaned us, just return ENXIO.
187 mtx_lock(&sc->sc_mtx);
188 if (sc->sc_orphaned || sc->sc_enxio_active) {
189 mtx_unlock(&sc->sc_mtx);
191 bp->b_ioflags |= BIO_ERROR;
196 mtx_unlock(&sc->sc_mtx);
199 bip->bio_cmd = bp->b_iocmd;
200 bip->bio_offset = bp->b_iooffset;
201 bip->bio_length = bp->b_bcount;
203 if ((bp->b_flags & B_BARRIER) != 0) {
204 bip->bio_flags |= BIO_ORDERED;
205 bp->b_flags &= ~B_BARRIER;
207 if (bp->b_iocmd == BIO_SPEEDUP)
208 bip->bio_flags |= bp->b_ioflags;
209 bip->bio_done = g_vfs_done;
210 bip->bio_caller2 = bp;
211 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
212 buf_track(bp, __func__);
213 bip->bio_track_bp = bp;
215 g_io_request(bip, cp);
219 g_vfs_orphan(struct g_consumer *cp)
222 struct g_event *event;
223 struct g_vfs_softc *sc;
229 g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name);
233 event = g_alloc_event(M_WAITOK);
234 mtx_lock(&sc->sc_mtx);
235 KASSERT(sc->sc_event == NULL, ("g_vfs %p already has an event", sc));
237 destroy = (sc->sc_active == 0);
239 sc->sc_event = event;
242 mtx_unlock(&sc->sc_mtx);
245 g_vfs_destroy(cp, 0);
249 * Do not destroy the geom. Filesystem will do that during unmount.
254 g_vfs_open(struct vnode *vp, struct g_consumer **cpp, const char *fsname, int wr)
257 struct g_provider *pp;
258 struct g_consumer *cp;
259 struct g_vfs_softc *sc;
267 if (bo->bo_private != vp)
270 pp = g_dev_getprovider(vp->v_rdev);
273 gp = g_new_geomf(&g_vfs_class, "%s.%s", fsname, pp->name);
274 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
275 mtx_init(&sc->sc_mtx, "g_vfs", NULL, MTX_DEF);
278 cp = g_new_consumer(gp);
279 error = g_attach(cp, pp);
281 g_wither_geom(gp, ENXIO);
284 error = g_access(cp, 1, wr, wr);
286 g_wither_geom(gp, ENXIO);
289 vnode_create_vobject(vp, pp->mediasize, curthread);
292 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
293 bo->bo_ops = g_vfs_bufops;
295 bo->bo_bsize = pp->sectorsize;
301 g_vfs_close(struct g_consumer *cp)
304 struct g_vfs_softc *sc;
312 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
313 bufobj_invalbuf(sc->sc_bo, V_SAVE, 0, 0);
315 sc->sc_bo->bo_private = cp->private;
317 mtx_destroy(&sc->sc_mtx);
318 if (!sc->sc_orphaned || cp->provider == NULL)
319 g_wither_geom_close(gp, ENXIO);
320 KASSERT(sc->sc_event == NULL, ("g_vfs %p event is non-NULL", sc));