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dev-lvmguy-raid_tiny_extent_size
lvm2/lib/device/dev-luks.c

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Detect LUKS signature in pvcreate One shiny day we should use libblkid here. But now using LUKS is very common together with LVM and pvcreate destroys LUKS completely. So for user's convenience, try to detect LUKS signature and allow abort.
2010-08-20 03:08:18 +04:00
/*
* Copyright (C) 2010 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,
doc: change fsf address Hmm rpmlint suggest fsf is using a different address these days, so lets keep it up-to-date
2016-01-21 13:49:46 +03:00
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Detect LUKS signature in pvcreate One shiny day we should use libblkid here. But now using LUKS is very common together with LVM and pvcreate destroys LUKS completely. So for user's convenience, try to detect LUKS signature and allow abort.
2010-08-20 03:08:18 +04:00
*/
#include "lib.h"
refactor: make device type recognition code common for general use Changes: - move device type registration out of "type filter" (filter.c) to a separate and new dev-type.[ch] for common use throughout the code - the structure for keeping the major numbers detected for available device types and available partitioning available is stored in "dev_types" structure now - move common partitioning detection code to dev-type.[ch] as well together with other device-related functions bound to dev_types (see dev-type.h for the interface) The dev-type interface contains all common functions used to detect subsystems/device types, signature/superblock recognition code, type-specific device properties and other common device properties (bound to dev_types), including partitioning support. - add dev_types instance to cmd context as cmd->dev_types for common use - use cmd->dev_types throughout as a central point for providing information about device types
2013-06-12 14:08:56 +04:00
#include "dev-type.h"
Detect LUKS signature in pvcreate One shiny day we should use libblkid here. But now using LUKS is very common together with LVM and pvcreate destroys LUKS completely. So for user's convenience, try to detect LUKS signature and allow abort.
2010-08-20 03:08:18 +04:00
#define LUKS_SIGNATURE "LUKS\xba\xbe"
#define LUKS_SIGNATURE_SIZE 6
device: cleanup signature wiping functions The wipe_known_signatures fn now wraps the _wipe_signature fn that is called for each known signature (currently md, swap and luks). This patch makes the code more readable, not repeating the same sequence when used anywhere in the code. We're going to reuse this code later...
2013-11-06 18:09:29 +04:00
int dev_is_luks(struct device *dev, uint64_t *offset_found)
Detect LUKS signature in pvcreate One shiny day we should use libblkid here. But now using LUKS is very common together with LVM and pvcreate destroys LUKS completely. So for user's convenience, try to detect LUKS signature and allow abort.
2010-08-20 03:08:18 +04:00
{
char buf[LUKS_SIGNATURE_SIZE];
int ret = -1;
Use new dev_open_readonly fn to prevent opening devices for read-write when not necessary. Before, we used vg_write_lock_held call to determnine the way a device is opened. Unfortunately, this opened many devices in RW mode when it was not really necessary. With the OPTIONS+="watch" rule used in the udev rules, this could fire numerous events while closing such devices (and it caused useless scans from within udev rules in return). A common bug we hit with this was with the lvremove command which was unable to remove the LV since it was being opened from within the udev rules. This patch should minimize such situations (at least with respect to LVM handling of devices). Though there's still a possibility someone will open a device 'outside' in parallel and fire the event based on the watch rule when closing a device once opened for RW.
2011-05-28 13:48:14 +04:00
if (!dev_open_readonly(dev)) {
Detect LUKS signature in pvcreate One shiny day we should use libblkid here. But now using LUKS is very common together with LVM and pvcreate destroys LUKS completely. So for user's convenience, try to detect LUKS signature and allow abort.
2010-08-20 03:08:18 +04:00
stack;
return -1;
}
device: cleanup signature wiping functions The wipe_known_signatures fn now wraps the _wipe_signature fn that is called for each known signature (currently md, swap and luks). This patch makes the code more readable, not repeating the same sequence when used anywhere in the code. We're going to reuse this code later...
2013-11-06 18:09:29 +04:00
if (offset_found)
*offset_found = 0;
Detect LUKS signature in pvcreate One shiny day we should use libblkid here. But now using LUKS is very common together with LVM and pvcreate destroys LUKS completely. So for user's convenience, try to detect LUKS signature and allow abort.
2010-08-20 03:08:18 +04:00
if (!dev_read(dev, 0, LUKS_SIGNATURE_SIZE, buf))
goto_out;
ret = memcmp(buf, LUKS_SIGNATURE, LUKS_SIGNATURE_SIZE) ? 0 : 1;
out:
if (!dev_close(dev))
stack;
return ret;
}
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