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/*
* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "base/memory/zalloc.h"
#include "lib/misc/lib.h"
#include "lib/filters/filter.h"
#include "lib/device/device_id.h"
#ifdef __linux__
#include <dirent.h>
static int _lvmdevices_update_msg;
static int _ignore_mpath_component(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
{
dev_t mpath_devno = 0;
dev->filtered_flags &= ~DEV_FILTERED_MPATH_COMPONENT;
if (dev_is_mpath_component(cmd, dev, &mpath_devno)) {
log_debug_devs("%s: Skipping mpath component device", dev_name(dev));
dev->filtered_flags |= DEV_FILTERED_MPATH_COMPONENT;
/*
* Warn about misconfig where an mpath component is
* in the devices file, but its mpath device is not.
*/
if ((dev->flags & DEV_MATCHED_USE_ID) && mpath_devno) {
if (!get_du_for_devno(cmd, mpath_devno)) {
struct device *mpath_dev = dev_cache_get_by_devt(cmd, mpath_devno);
log_warn("WARNING: devices file is missing %s (%d:%d) using multipath component %s.",
mpath_dev ? dev_name(mpath_dev) : "unknown",
(int)MAJOR(mpath_devno), (int)MINOR(mpath_devno), dev_name(dev));
if (!_lvmdevices_update_msg && strcmp(get_cmd_name(), "lvmdevices")) {
log_warn("See lvmdevices --update for devices file update.");
_lvmdevices_update_msg = 1;
}
}
}
return 0;
}
return 1;
}
static void _destroy(struct dev_filter *f)
{
if (f->use_count)
log_error(INTERNAL_ERROR "Destroying mpath filter while in use %u times.", f->use_count);
free(f);
}
struct dev_filter *mpath_filter_create(struct dev_types *dt)
{
struct dev_filter *f;
const char *sysfs_dir = dm_sysfs_dir();
if (!*sysfs_dir) {
log_verbose("No proc filesystem found: skipping multipath filter");
return NULL;
}
if (!(f = zalloc(sizeof(*f)))) {
log_error("mpath filter allocation failed");
return NULL;
}
f->passes_filter = _ignore_mpath_component;
f->destroy = _destroy;
f->use_count = 0;
f->name = "mpath";
log_debug_devs("mpath filter initialised.");
return f;
}
#else
struct dev_filter *mpath_filter_create(struct dev_types *dt)
{
return NULL;
}
#endif
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