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git://sourceware.org/git/lvm2.git
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f65dd341a5
Previously, we have relied on UUIDs alone, and on lvmcache to make getting a "new copy" of VG metadata fast. If the code which triggers the activation has the correct VG metadata at hand (the version which is currently on disk), it can now hand it to the activation code directly.
106 lines
2.7 KiB
C
106 lines
2.7 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);
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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, NULL);
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case LCK_READ:
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return lv_activate_with_filter(cmd, resource, 0, NULL);
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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);
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case LCK_EXCL:
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return lv_activate_with_filter(cmd, resource, 1, NULL);
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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 _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->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->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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