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ce7489ed22
A common scenario is during new LV creation when we need to wipe the newly created LV and avoid any udev scanning before this stage otherwise it could cause the device (the LV) to be claimed by some other subsystem for which there were stale metadata within LV data. This patch adds possibility to mark the LV we're just about to wipe with a flag that gets passed to udev via DM_COOKIE as a subsystem specific flag - DM_SUBSYSTEM_UDEV_FLAG0 (in this case the subsystem is "LVM") so LVM udev rules will take care of handling that.
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "locking.h"
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#include "locking_types.h"
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#include "lvm-string.h"
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#include "activate.h"
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#include <signal.h>
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/*
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* No locking
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*/
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static void _no_fin_locking(void)
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{
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}
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static void _no_reset_locking(void)
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{
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}
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static int _no_lock_resource(struct cmd_context *cmd, const char *resource,
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uint32_t flags, struct logical_volume *lv)
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{
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switch (flags & LCK_SCOPE_MASK) {
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case LCK_VG:
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if (!strcmp(resource, VG_SYNC_NAMES))
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fs_unlock();
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break;
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case LCK_LV:
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switch (flags & LCK_TYPE_MASK) {
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case LCK_NULL:
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return lv_deactivate(cmd, resource, lv_ondisk(lv));
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case LCK_UNLOCK:
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return lv_resume_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1: 0, 0, (flags & LCK_REVERT) ? 1 : 0, lv_ondisk(lv));
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case LCK_READ:
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return lv_activate_with_filter(cmd, resource, 0, lv->status & LV_NOSCAN ? 1 : 0, lv_ondisk(lv));
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case LCK_WRITE:
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return lv_suspend_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1 : 0, 0, lv_ondisk(lv), lv);
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case LCK_EXCL:
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return lv_activate_with_filter(cmd, resource, 1, lv->status & LV_NOSCAN ? 1 : 0, lv_ondisk(lv));
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default:
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break;
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}
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break;
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default:
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log_error("Unrecognised lock scope: %d",
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flags & LCK_SCOPE_MASK);
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return 0;
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}
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return 1;
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}
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static int _no_query_resource(const char *resource, int *mode)
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{
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log_very_verbose("Locking is disabled: Treating lock %s as not held.",
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resource);
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return 1;
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}
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static int _readonly_lock_resource(struct cmd_context *cmd,
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const char *resource,
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uint32_t flags, struct logical_volume *lv)
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{
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if ((flags & LCK_TYPE_MASK) == LCK_WRITE &&
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(flags & LCK_SCOPE_MASK) == LCK_VG &&
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!(flags & LCK_CACHE) &&
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strcmp(resource, VG_GLOBAL)) {
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log_error("Read-only locking type set. "
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"Write locks are prohibited.");
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return 0;
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}
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return _no_lock_resource(cmd, resource, flags, lv);
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}
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int init_no_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)),
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int suppress_messages)
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{
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locking->lock_resource = _no_lock_resource;
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locking->query_resource = _no_query_resource;
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locking->reset_locking = _no_reset_locking;
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locking->fin_locking = _no_fin_locking;
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locking->flags = LCK_CLUSTERED;
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return 1;
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}
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int init_readonly_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)),
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int suppress_messages)
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{
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locking->lock_resource = _readonly_lock_resource;
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locking->query_resource = _no_query_resource;
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locking->reset_locking = _no_reset_locking;
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locking->fin_locking = _no_fin_locking;
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locking->flags = 0;
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return 1;
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}
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