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https://github.com/xen-project/xen.git
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Ian Campbell
4f6dda6a14
We pass be_path to tapdisk_destroy but we've already deleted it so it fails to read tapdisk-params. However it appears that we need to destroy the tap device after tearing down xenstore, to avoid the leak reported by Greg Wettstein in <201207312141.q6VLfJje012656@wind.enjellic.com>. So read the tapdisk-params in the cleanup transaction, before the remove, and pass that down to destroy_tapdisk instead. tapdisk-params may of course be NULL if the device isn't a tap device. There is no need to tear down the tap device from libxl__initiate_device_remove since this ultimately calls libxl__device_destroy. Propagate and log errors from libxl__device_destroy_tapdisk. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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* Copyright (C) 2010 Advanced Micro Devices
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* Author Christoph Egger <Christoph.Egger@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; version 2.1 only.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*/
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#include "libxl_osdeps.h" /* must come before any other headers */
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#include "libxl_internal.h"
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#include "tap-ctl.h"
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int libxl__blktap_enabled(libxl__gc *gc)
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{
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const char *msg;
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return !tap_ctl_check(&msg);
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}
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char *libxl__blktap_devpath(libxl__gc *gc,
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const char *disk,
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libxl_disk_format format)
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{
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const char *type;
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char *params, *devname = NULL;
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tap_list_t tap;
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int err;
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type = libxl__device_disk_string_of_format(format);
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err = tap_ctl_find(type, disk, &tap);
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if (err == 0) {
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devname = libxl__sprintf(gc, "/dev/xen/blktap-2/tapdev%d", tap.minor);
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if (devname)
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return devname;
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}
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params = libxl__sprintf(gc, "%s:%s", type, disk);
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err = tap_ctl_create(params, &devname);
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if (!err) {
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libxl__ptr_add(gc, devname);
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return devname;
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}
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return NULL;
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}
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int libxl__device_destroy_tapdisk(libxl__gc *gc, const char *params)
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{
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char *type, *disk;
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int err;
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tap_list_t tap;
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type = libxl__strdup(gc, params);
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disk = strchr(type, ':');
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if (!disk) {
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LOG(ERROR, "Unable to parse params %s", params);
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return ERROR_INVAL;
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}
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*disk++ = '\0';
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err = tap_ctl_find(type, disk, &tap);
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if (err < 0) {
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/* returns -errno */
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LOGEV(ERROR, -err, "Unable to find type %s disk %s", type, disk);
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return ERROR_FAIL;
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}
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err = tap_ctl_destroy(tap.id, tap.minor);
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if (err < 0) {
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LOGEV(ERROR, -err, "Failed to destroy tap device id %d minor %d",
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tap.id, tap.minor);
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return ERROR_FAIL;
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}
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return 0;
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}
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/*
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* Local variables:
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* mode: C
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* c-basic-offset: 4
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* indent-tabs-mode: nil
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* End:
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*/
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