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lvm2/lib/filters/filter-sysfs.c

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/*
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
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* 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.
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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,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "lib/misc/lib.h"
#include "lib/filters/filter.h"
#ifdef __linux__
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static int _accept_p(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
{
char path[PATH_MAX];
const char *sysfs_dir = f->private;
struct stat info;
dev->filtered_flags &= ~DEV_FILTERED_SYSFS;
/*
* Any kind of device id other than devname has been set
* using sysfs so we know that sysfs info exists for dev.
*/
if (dev->id && dev->id->idtype && (dev->id->idtype != DEV_ID_TYPE_DEVNAME))
return 1;
if (dm_snprintf(path, sizeof(path), "%sdev/block/%u:%u",
sysfs_dir, MAJOR(dev->dev), MINOR(dev->dev)) < 0) {
log_debug("failed to create sysfs path");
return 1;
}
if (lstat(path, &info)) {
log_debug_devs("%s: Skipping (sysfs)", dev_name(dev));
dev->filtered_flags |= DEV_FILTERED_SYSFS;
return 0;
}
return 1;
}
static void _destroy(struct dev_filter *f)
{
if (f->use_count)
log_error(INTERNAL_ERROR "Destroying sysfs filter while in use %u times.", f->use_count);
free(f);
}
static int _check_sys_dev_block(const char *sysfs_dir)
{
char path[PATH_MAX];
struct stat info;
if (dm_snprintf(path, sizeof(path), "%sdev/block", sysfs_dir) < 0)
return_0;
if (lstat(path, &info)) {
log_debug("filter-sysfs disabled: /sys/dev/block not found");
return 0;
}
return 1;
}
struct dev_filter *sysfs_filter_create(const char *sysfs_dir)
{
struct dev_filter *f;
size_t len;
if (!sysfs_dir || !*sysfs_dir) {
log_verbose("No proc filesystem found: skipping sysfs filter");
return NULL;
}
/* support old kernels that don't have this */
if (!_check_sys_dev_block(sysfs_dir))
return NULL;
len = strlen(sysfs_dir) + 1;
if (!(f = zalloc(sizeof(*f) + len)))
return NULL;
f->passes_filter = _accept_p;
f->destroy = _destroy;
f->use_count = 0;
f->name = "sysfs";
memcpy(f + 1, sysfs_dir, len);
f->private = (f + 1);
log_debug_devs("Sysfs filter initialised.");
return f;
}
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#else
struct dev_filter *sysfs_filter_create(const char *sysfs_dir __attribute__((unused)))
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{
return NULL;
}
#endif