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d99c155975
particular provider. Use this function where g_orphan_provider() is being called so that the flags are updated correctly and g_orphan_provider() is called only when allowed.
498 lines
14 KiB
C
498 lines
14 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/errno.h>
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#include <sys/sbuf.h>
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#include <geom/geom.h>
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#include <geom/geom_slice.h>
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#include <machine/stdarg.h>
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static g_access_t g_slice_access;
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static g_start_t g_slice_start;
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static struct g_slicer *
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g_slice_alloc(unsigned nslice, unsigned scsize)
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{
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struct g_slicer *gsp;
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gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO);
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if (scsize > 0)
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gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO);
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else
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gsp->softc = NULL;
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gsp->slices = g_malloc(nslice * sizeof(struct g_slice),
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M_WAITOK | M_ZERO);
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gsp->nslice = nslice;
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return (gsp);
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}
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static void
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g_slice_free(struct g_slicer *gsp)
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{
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if (gsp == NULL) /* XXX: phk thinks about this */
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return;
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g_free(gsp->slices);
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if (gsp->hotspot != NULL)
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g_free(gsp->hotspot);
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if (gsp->softc != NULL)
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g_free(gsp->softc);
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g_free(gsp);
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}
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static int
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g_slice_access(struct g_provider *pp, int dr, int dw, int de)
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{
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int error;
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u_int u;
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_provider *pp2;
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struct g_slicer *gsp;
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struct g_slice *gsl, *gsl2;
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gp = pp->geom;
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cp = LIST_FIRST(&gp->consumer);
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KASSERT (cp != NULL, ("g_slice_access but no consumer"));
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gsp = gp->softc;
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if (dr > 0 || dw > 0 || de > 0) {
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gsl = &gsp->slices[pp->index];
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for (u = 0; u < gsp->nslice; u++) {
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gsl2 = &gsp->slices[u];
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if (gsl2->length == 0)
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continue;
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if (u == pp->index)
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continue;
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if (gsl->offset + gsl->length <= gsl2->offset)
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continue;
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if (gsl2->offset + gsl2->length <= gsl->offset)
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continue;
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/* overlap */
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pp2 = gsl2->provider;
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if ((pp->acw + dw) > 0 && pp2->ace > 0)
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return (EPERM);
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if ((pp->ace + de) > 0 && pp2->acw > 0)
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return (EPERM);
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}
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}
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/* On first open, grab an extra "exclusive" bit */
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if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0)
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de++;
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/* ... and let go of it on last close */
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if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1)
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de--;
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error = g_access(cp, dr, dw, de);
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return (error);
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}
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/*
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* XXX: It should be possible to specify here if we should finish all of the
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* XXX: bio, or only the non-hot bits. This would get messy if there were
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* XXX: two hot spots in the same bio, so for now we simply finish off the
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* XXX: entire bio. Modifying hot data on the way to disk is frowned on
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* XXX: so making that considerably harder is not a bad idea anyway.
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*/
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void
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g_slice_finish_hot(struct bio *bp)
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{
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struct bio *bp2;
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_slicer *gsp;
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struct g_slice *gsl;
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int idx;
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KASSERT(bp->bio_to != NULL,
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("NULL bio_to in g_slice_finish_hot(%p)", bp));
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KASSERT(bp->bio_from != NULL,
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("NULL bio_from in g_slice_finish_hot(%p)", bp));
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gp = bp->bio_to->geom;
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gsp = gp->softc;
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cp = LIST_FIRST(&gp->consumer);
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KASSERT(cp != NULL, ("NULL consumer in g_slice_finish_hot(%p)", bp));
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idx = bp->bio_to->index;
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gsl = &gsp->slices[idx];
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bp2 = g_clone_bio(bp);
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if (bp2 == NULL) {
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g_io_deliver(bp, ENOMEM);
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return;
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}
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if (bp2->bio_offset + bp2->bio_length > gsl->length)
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bp2->bio_length = gsl->length - bp2->bio_offset;
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bp2->bio_done = g_std_done;
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bp2->bio_offset += gsl->offset;
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g_io_request(bp2, cp);
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return;
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}
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static void
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g_slice_start(struct bio *bp)
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{
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struct bio *bp2;
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struct g_provider *pp;
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_slicer *gsp;
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struct g_slice *gsl;
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struct g_slice_hot *ghp;
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int idx, error;
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u_int m_index;
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off_t t;
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pp = bp->bio_to;
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gp = pp->geom;
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gsp = gp->softc;
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cp = LIST_FIRST(&gp->consumer);
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idx = pp->index;
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gsl = &gsp->slices[idx];
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switch(bp->bio_cmd) {
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case BIO_READ:
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case BIO_WRITE:
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case BIO_DELETE:
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if (bp->bio_offset > gsl->length) {
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g_io_deliver(bp, EINVAL); /* XXX: EWHAT ? */
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return;
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}
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/*
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* Check if we collide with any hot spaces, and call the
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* method once if so.
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*/
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t = bp->bio_offset + gsl->offset;
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for (m_index = 0; m_index < gsp->nhotspot; m_index++) {
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ghp = &gsp->hotspot[m_index];
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if (t >= ghp->offset + ghp->length)
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continue;
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if (t + bp->bio_length <= ghp->offset)
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continue;
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switch(bp->bio_cmd) {
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case BIO_READ: idx = ghp->ract; break;
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case BIO_WRITE: idx = ghp->wact; break;
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case BIO_DELETE: idx = ghp->dact; break;
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}
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switch(idx) {
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case G_SLICE_HOT_ALLOW:
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/* Fall out and continue normal processing */
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continue;
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case G_SLICE_HOT_DENY:
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g_io_deliver(bp, EROFS);
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return;
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case G_SLICE_HOT_START:
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error = gsp->start(bp);
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if (error && error != EJUSTRETURN)
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g_io_deliver(bp, error);
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return;
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case G_SLICE_HOT_CALL:
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error = g_post_event(gsp->hot, bp, M_NOWAIT,
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gp, NULL);
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if (error)
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g_io_deliver(bp, error);
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return;
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}
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break;
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}
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bp2 = g_clone_bio(bp);
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if (bp2 == NULL) {
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g_io_deliver(bp, ENOMEM);
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return;
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}
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if (bp2->bio_offset + bp2->bio_length > gsl->length)
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bp2->bio_length = gsl->length - bp2->bio_offset;
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bp2->bio_done = g_std_done;
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bp2->bio_offset += gsl->offset;
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g_io_request(bp2, cp);
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return;
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case BIO_GETATTR:
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/* Give the real method a chance to override */
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if (gsp->start != NULL && gsp->start(bp))
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return;
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if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) {
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struct g_kerneldump *gkd;
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gkd = (struct g_kerneldump *)bp->bio_data;
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gkd->offset += gsp->slices[idx].offset;
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if (gkd->length > gsp->slices[idx].length)
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gkd->length = gsp->slices[idx].length;
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/* now, pass it on downwards... */
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}
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bp2 = g_clone_bio(bp);
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if (bp2 == NULL) {
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g_io_deliver(bp, ENOMEM);
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return;
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}
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bp2->bio_done = g_std_done;
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g_io_request(bp2, cp);
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break;
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default:
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g_io_deliver(bp, EOPNOTSUPP);
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return;
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}
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}
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void
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g_slice_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
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{
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struct g_slicer *gsp;
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gsp = gp->softc;
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if (indent == NULL) {
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sbuf_printf(sb, " i %u", pp->index);
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sbuf_printf(sb, " o %ju",
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(uintmax_t)gsp->slices[pp->index].offset);
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return;
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}
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if (pp != NULL) {
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sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index);
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sbuf_printf(sb, "%s<length>%ju</length>\n",
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indent, (uintmax_t)gsp->slices[pp->index].length);
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sbuf_printf(sb, "%s<seclength>%ju</seclength>\n", indent,
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(uintmax_t)gsp->slices[pp->index].length / 512);
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sbuf_printf(sb, "%s<offset>%ju</offset>\n", indent,
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(uintmax_t)gsp->slices[pp->index].offset);
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sbuf_printf(sb, "%s<secoffset>%ju</secoffset>\n", indent,
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(uintmax_t)gsp->slices[pp->index].offset / 512);
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}
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}
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int
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g_slice_config(struct g_geom *gp, u_int idx, int how, off_t offset, off_t length, u_int sectorsize, const char *fmt, ...)
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{
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struct g_provider *pp, *pp2;
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struct g_slicer *gsp;
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struct g_slice *gsl;
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va_list ap;
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struct sbuf *sb;
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int acc;
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g_trace(G_T_TOPOLOGY, "g_slice_config(%s, %d, %d)",
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gp->name, idx, how);
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g_topology_assert();
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gsp = gp->softc;
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if (idx >= gsp->nslice)
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return(EINVAL);
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gsl = &gsp->slices[idx];
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pp = gsl->provider;
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if (pp != NULL)
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acc = pp->acr + pp->acw + pp->ace;
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else
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acc = 0;
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if (acc != 0 && how != G_SLICE_CONFIG_FORCE) {
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if (length < gsl->length)
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return(EBUSY);
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if (offset != gsl->offset)
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return(EBUSY);
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}
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/* XXX: check offset + length <= MEDIASIZE */
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if (how == G_SLICE_CONFIG_CHECK)
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return (0);
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gsl->length = length;
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gsl->offset = offset;
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gsl->sectorsize = sectorsize;
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if (length == 0) {
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if (pp == NULL)
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return (0);
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if (bootverbose)
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printf("GEOM: Deconfigure %s\n", pp->name);
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g_wither_provider(pp, ENXIO);
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gsl->provider = NULL;
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gsp->nprovider--;
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return (0);
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}
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if (pp != NULL) {
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if (bootverbose)
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printf("GEOM: Reconfigure %s, start %jd length %jd end %jd\n",
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pp->name, (intmax_t)offset, (intmax_t)length,
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(intmax_t)(offset + length - 1));
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pp->mediasize = gsl->length;
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return (0);
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}
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sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
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va_start(ap, fmt);
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sbuf_vprintf(sb, fmt, ap);
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va_end(ap);
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sbuf_finish(sb);
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pp = g_new_providerf(gp, sbuf_data(sb));
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pp2 = LIST_FIRST(&gp->consumer)->provider;
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pp->flags = pp2->flags & G_PF_CANDELETE;
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if (pp2->stripesize > 0) {
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pp->stripesize = pp2->stripesize;
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pp->stripeoffset = (pp2->stripeoffset + offset) % pp->stripesize;
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}
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if (0 && bootverbose)
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printf("GEOM: Configure %s, start %jd length %jd end %jd\n",
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pp->name, (intmax_t)offset, (intmax_t)length,
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(intmax_t)(offset + length - 1));
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pp->index = idx;
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pp->mediasize = gsl->length;
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pp->sectorsize = gsl->sectorsize;
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gsl->provider = pp;
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gsp->nprovider++;
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g_error_provider(pp, 0);
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sbuf_delete(sb);
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return(0);
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}
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/*
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* Configure "hotspots". A hotspot is a piece of the parent device which
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* this particular slicer cares about for some reason. Typically because
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* it contains meta-data used to configure the slicer.
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* A hotspot is identified by its index number. The offset and length are
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* relative to the parent device, and the three "?act" fields specify
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* what action to take on BIO_READ, BIO_DELETE and BIO_WRITE.
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*
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* XXX: There may be a race relative to g_slice_start() here, if an existing
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* XXX: hotspot is changed wile I/O is happening. Should this become a problem
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* XXX: we can protect the hotspot stuff with a mutex.
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*/
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int
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g_slice_conf_hot(struct g_geom *gp, u_int idx, off_t offset, off_t length, int ract, int dact, int wact)
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{
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struct g_slicer *gsp;
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struct g_slice_hot *gsl, *gsl2;
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g_trace(G_T_TOPOLOGY, "g_slice_conf_hot(%s, idx: %d, off: %jd, len: %jd)",
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gp->name, idx, (intmax_t)offset, (intmax_t)length);
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g_topology_assert();
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gsp = gp->softc;
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gsl = gsp->hotspot;
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if(idx >= gsp->nhotspot) {
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gsl2 = g_malloc((idx + 1) * sizeof *gsl2, M_WAITOK | M_ZERO);
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if (gsp->hotspot != NULL)
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bcopy(gsp->hotspot, gsl2, gsp->nhotspot * sizeof *gsl2);
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gsp->hotspot = gsl2;
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if (gsp->hotspot != NULL)
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g_free(gsl);
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gsl = gsl2;
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gsp->nhotspot = idx + 1;
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}
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gsl[idx].offset = offset;
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gsl[idx].length = length;
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KASSERT(!((ract | dact | wact) & G_SLICE_HOT_START)
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|| gsp->start != NULL, ("G_SLICE_HOT_START but no slice->start"));
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/* XXX: check that we _have_ a start function if HOT_START specified */
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gsl[idx].ract = ract;
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gsl[idx].dact = dact;
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gsl[idx].wact = wact;
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return (0);
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}
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void
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g_slice_spoiled(struct g_consumer *cp)
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{
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struct g_geom *gp;
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struct g_slicer *gsp;
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g_topology_assert();
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gp = cp->geom;
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g_trace(G_T_TOPOLOGY, "g_slice_spoiled(%p/%s)", cp, gp->name);
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gsp = gp->softc;
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gp->softc = NULL;
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g_slice_free(gsp);
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g_wither_geom(gp, ENXIO);
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}
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int
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g_slice_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
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{
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g_slice_spoiled(LIST_FIRST(&gp->consumer));
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return (0);
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}
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struct g_geom *
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g_slice_new(struct g_class *mp, u_int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start)
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{
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struct g_geom *gp;
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struct g_slicer *gsp;
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struct g_consumer *cp;
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void **vp;
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int error;
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g_topology_assert();
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vp = (void **)extrap;
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gp = g_new_geomf(mp, "%s", pp->name);
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gsp = g_slice_alloc(slices, extra);
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gsp->start = start;
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gp->access = g_slice_access;
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gp->orphan = g_slice_orphan;
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gp->softc = gsp;
|
|
gp->start = g_slice_start;
|
|
gp->spoiled = g_slice_spoiled;
|
|
if (gp->dumpconf == NULL)
|
|
gp->dumpconf = g_slice_dumpconf;
|
|
if (gp->class->destroy_geom == NULL)
|
|
gp->class->destroy_geom = g_slice_destroy_geom;
|
|
cp = g_new_consumer(gp);
|
|
error = g_attach(cp, pp);
|
|
if (error == 0)
|
|
error = g_access(cp, 1, 0, 0);
|
|
if (error) {
|
|
g_wither_geom(gp, ENXIO);
|
|
return (NULL);
|
|
}
|
|
if (extrap != NULL)
|
|
*vp = gsp->softc;
|
|
*cpp = cp;
|
|
return (gp);
|
|
}
|
|
|
|
void
|
|
g_slice_orphan(struct g_consumer *cp)
|
|
{
|
|
|
|
g_trace(G_T_TOPOLOGY, "g_slice_orphan(%p/%s)", cp, cp->provider->name);
|
|
g_topology_assert();
|
|
KASSERT(cp->provider->error != 0,
|
|
("g_slice_orphan with error == 0"));
|
|
|
|
/* XXX: Not good enough we leak the softc and its suballocations */
|
|
g_slice_free(cp->geom->softc);
|
|
g_wither_geom(cp->geom, cp->provider->error);
|
|
}
|