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/*
* Copyright (C) 2004 Luca Berra
* Copyright (C) 2004-2006 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/commands/toolcontext.h"
#ifdef __linux__
#define BUFSIZE 4096
static int _ignore_signature(struct cmd_context *cmd, struct dev_filter *f __attribute__((unused)),
struct device *dev, const char *use_filter_name)
{
char buf[BUFSIZE];
int ret = 0;
if (cmd->filter_nodata_only)
return 1;
if (!scan_bcache) {
/* let pass, call again after scan */
log_debug_devs("filter signature deferred %s", dev_name(dev));
dev->flags |= DEV_FILTER_AFTER_SCAN;
return 1;
}
memset(buf, 0, BUFSIZE);
if (!dev_read_bytes(dev, 0, BUFSIZE, buf)) {
log_debug_devs("%s: Skipping: error in signature detection",
dev_name(dev));
ret = 0;
goto out;
}
if (dev_is_lvm1(dev, buf, BUFSIZE)) {
log_debug_devs("%s: Skipping lvm1 device", dev_name(dev));
ret = 0;
goto out;
}
if (dev_is_pool(dev, buf, BUFSIZE)) {
log_debug_devs("%s: Skipping gfs-pool device", dev_name(dev));
ret = 0;
goto out;
}
ret = 1;
out:
return ret;
}
static void _destroy(struct dev_filter *f)
{
if (f->use_count)
log_error(INTERNAL_ERROR "Destroying signature filter while in use %u times.", f->use_count);
free(f);
}
struct dev_filter *signature_filter_create(struct dev_types *dt)
{
struct dev_filter *f;
if (!(f = zalloc(sizeof(*f)))) {
log_error("md filter allocation failed");
return NULL;
}
f->passes_filter = _ignore_signature;
f->destroy = _destroy;
f->use_count = 0;
f->private = dt;
f->name = "signature";
log_debug_devs("signature filter initialised.");
return f;
}
#else
struct dev_filter *signature_filter_create(struct dev_types *dt)
{
return NULL;
}
#endif
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