3728855a0f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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/bio.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <geom/geom.h>
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#define G_ZERO_CLASS_NAME "ZERO"
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static int g_zero_clear_sysctl(SYSCTL_HANDLER_ARGS);
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SYSCTL_DECL(_kern_geom);
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static SYSCTL_NODE(_kern_geom, OID_AUTO, zero, CTLFLAG_RW, 0,
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"GEOM_ZERO stuff");
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static int g_zero_clear = 1;
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SYSCTL_PROC(_kern_geom_zero, OID_AUTO, clear, CTLTYPE_INT|CTLFLAG_RW,
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&g_zero_clear, 0, g_zero_clear_sysctl, "I", "Clear read data buffer");
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static int g_zero_byte = 0;
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SYSCTL_INT(_kern_geom_zero, OID_AUTO, byte, CTLFLAG_RW, &g_zero_byte, 0,
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"Byte (octet) value to clear the buffers with");
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static struct g_provider *gpp;
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static int
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g_zero_clear_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int error;
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error = sysctl_handle_int(oidp, &g_zero_clear, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (gpp == NULL)
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return (ENXIO);
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if (g_zero_clear)
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gpp->flags &= ~G_PF_ACCEPT_UNMAPPED;
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else
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gpp->flags |= G_PF_ACCEPT_UNMAPPED;
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return (0);
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}
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static void
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g_zero_start(struct bio *bp)
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{
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int error = ENXIO;
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switch (bp->bio_cmd) {
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case BIO_READ:
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if (g_zero_clear && (bp->bio_flags & BIO_UNMAPPED) == 0)
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memset(bp->bio_data, g_zero_byte, bp->bio_length);
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/* FALLTHROUGH */
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case BIO_DELETE:
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case BIO_WRITE:
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bp->bio_completed = bp->bio_length;
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error = 0;
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break;
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case BIO_GETATTR:
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default:
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error = EOPNOTSUPP;
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break;
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}
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g_io_deliver(bp, error);
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}
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static void
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g_zero_init(struct g_class *mp)
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{
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struct g_geom *gp;
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struct g_provider *pp;
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g_topology_assert();
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gp = g_new_geomf(mp, "gzero");
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gp->start = g_zero_start;
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gp->access = g_std_access;
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gpp = pp = g_new_providerf(gp, "%s", gp->name);
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pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
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if (!g_zero_clear)
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pp->flags |= G_PF_ACCEPT_UNMAPPED;
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pp->mediasize = 1152921504606846976LLU;
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pp->sectorsize = 512;
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g_error_provider(pp, 0);
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}
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static int
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g_zero_destroy_geom(struct gctl_req *req __unused, struct g_class *mp __unused,
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struct g_geom *gp)
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{
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struct g_provider *pp;
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g_topology_assert();
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if (gp == NULL)
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return (0);
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pp = LIST_FIRST(&gp->provider);
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if (pp == NULL)
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return (0);
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if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0)
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return (EBUSY);
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gpp = NULL;
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g_wither_geom(gp, ENXIO);
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return (0);
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}
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static struct g_class g_zero_class = {
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.name = G_ZERO_CLASS_NAME,
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.version = G_VERSION,
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.init = g_zero_init,
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.destroy_geom = g_zero_destroy_geom
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};
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DECLARE_GEOM_CLASS(g_zero_class, g_zero);
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