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/*
* Copyright (C) 2014 Red Hat, Inc.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*/
#include "tools.h"
#include "metadata.h"
#include "lvmetad.h"
#include "lvmlockd.h"
#include "lvmcache.h"
#include "lvmlockd-client.h"
static int _mode_num(const char *mode)
{
if (!strcmp(mode, "na"))
return -2;
if (!strcmp(mode, "un"))
return -1;
if (!strcmp(mode, "nl"))
return 0;
if (!strcmp(mode, "sh"))
return 1;
if (!strcmp(mode, "ex"))
return 2;
return -3;
}
/* same rules as strcmp */
static int _mode_compare(const char *m1, const char *m2)
{
int n1 = _mode_num(m1);
int n2 = _mode_num(m2);
if (n1 < n2)
return -1;
if (n1 == n2)
return 0;
if (n1 > n2)
return 1;
return -2;
}
/*
* Mode is selected by:
* 1. mode from command line option (only taken if allow_override is set)
* 2. the function arg passed by the calling command (def_mode)
* 3. look up a default mode for the command
* (cases where the caller doesn't know a default)
*
* MODE_NOARG: don't use mode from command line option
*/
/*
* dlock_gl_create() is used by vgcreate to acquire and/or create the
* global lock. vgcreate will have a lock_type for the new vg which
* dlock_gl_create() can provide in the lock-gl call.
*
* dlock_gl() and dlock_gl_create() differ in the specific cases where
* ENOLS (no lockspace found) is overriden. In the vgcreate case, the
* override cases are related to sanlock bootstrap, and the lock_type of
* the vg being created is needed.
*
* 1. vgcreate of the first dlock-type vg calls dlock_gl_create()
* to acquire the global lock.
*
* 2. vgcreate/dlock_gl_create passes gl lock request to lvmlockd,
* along with lock_type of the new vg.
*
* 3. lvmlockd finds no global lockspace/lock.
*
* 4. dlm:
* If the lock_type from vgcreate is dlm, lvmlockd creates the
* dlm global lockspace, and queues the global lock request
* for vgcreate. dlock_gl_create returns sucess with the gl held.
*
* sanlock:
* If the lock_type from vgcreate is sanlock, lvmlockd returns -ENOLS
* with the NO_GL_LS flag. lvmlockd cannot create or acquire a sanlock
* global lock until the VG exists on disk (the locks live within the VG).
*
* dlock_gl_create sees sanlock/ENOLS/NO_GL_LS (and optionally the
* "enable" lock-gl arg), determines that this is the sanlock
* bootstrap special case, and returns success without the global lock.
*
* vgcreate creates the VG on disk, and calls lvmlockd_init_vg() which
* initializes/enables a global lock on the new VG's internal sanlock lv.
* Future dlock_gl/dlock_gl_create calls will acquire the existing gl.
*/
int dlock_gl_create(struct cmd_context *cmd, const char *def_mode, uint32_t flags,
const char *vg_lock_type)
{
const char *mode = NULL;
if (!(flags & DL_GL_MODE_NOARG)) {
mode = arg_str_value(cmd, lockgl_ARG, NULL);
if (mode && def_mode && strcmp(mode, "enable") &&
(_mode_compare(mode, def_mode) < 0) &&
!find_config_tree_bool(cmd, global_allow_override_lock_modes_CFG, NULL)) {
log_error("Disallowed lock-gl mode \"%s\"", mode);
return 0;
}
}
if (!mode)
mode = def_mode;
if (!mode) {
log_error("Unknown lock-gl mode");
return 0;
}
if (!strcmp(mode, "ex") && find_config_tree_bool(cmd, global_read_only_lock_modes_CFG, NULL)) {
log_error("Disallow lock-gl ex with read_only_lock_modes");
return 0;
}
return lvmlockd_gl_create(cmd, command_name(cmd), mode, vg_lock_type);
}
int dlock_gl(struct cmd_context *cmd, const char *def_mode, uint32_t flags)
{
const char *mode = NULL;
if (!(flags & DL_GL_MODE_NOARG)) {
mode = arg_str_value(cmd, lockgl_ARG, NULL);
if (mode && def_mode &&
(_mode_compare(mode, def_mode) < 0) &&
!find_config_tree_bool(cmd, global_allow_override_lock_modes_CFG, NULL)) {
log_error("Disallowed lock-gl mode \"%s\"", mode);
return 0;
}
}
if (!mode)
mode = def_mode;
if (!mode) {
log_error("Unknown lock-gl mode");
return 0;
}
if (!strcmp(mode, "ex") && find_config_tree_bool(cmd, global_read_only_lock_modes_CFG, NULL)) {
log_error("Disallow lock-gl ex with read_only_lock_modes");
return 0;
}
if (!lvmlockd_gl(cmd, command_name(cmd), mode, flags)) {
/*
* These options historically mean that locking is expected
* to fail and the command should be allowed to proceed anyway.
*/
if (arg_is_set(cmd, sysinit_ARG) || arg_is_set(cmd, ignorelockingfailure_ARG)) {
log_debug("Ignore failed locking for global lock: option %s",
arg_is_set(cmd, sysinit_ARG) ? "sysinit" : "ignorelockingfailure");
return 1;
}
return 0;
}
return 1;
}
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