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Also, add a new 'obtain_device_list_from_udev' setting to lvm.conf with which we can turn this feature on or off if needed. If set, the cache of block device nodes with all associated symlinks will be constructed out of the existing udev database content. This avoids using and opening any inapplicable non-block devices or subdirectories found in the device directory. This setting is applied to udev-managed device directory only, other directories will be scanned fully. LVM2 needs to be compiled with udev support for this setting to take effect. N.B. Any device node or symlink not managed by udev in udev directory will be ignored with this setting on.
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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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,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LVM_DEV_CACHE_H
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#define _LVM_DEV_CACHE_H
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#include "device.h"
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#include "lvm-wrappers.h"
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/*
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* predicate for devices.
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*/
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struct dev_filter {
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int (*passes_filter) (struct dev_filter * f, struct device * dev);
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void (*destroy) (struct dev_filter * f);
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unsigned use_count;
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void *private;
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};
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/*
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* The global device cache.
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*/
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struct cmd_context;
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int dev_cache_init(struct cmd_context *cmd);
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void dev_cache_exit(void);
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/* Trigger(1) or avoid(0) a scan */
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void dev_cache_scan(int do_scan);
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int dev_cache_has_scanned(void);
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int dev_cache_add_dir(const char *path);
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int dev_cache_add_loopfile(const char *path);
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struct device *dev_cache_get(const char *name, struct dev_filter *f);
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void dev_set_preferred_name(struct str_list *sl, struct device *dev);
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/*
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* Object for iterating through the cache.
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*/
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struct dev_iter;
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struct dev_iter *dev_iter_create(struct dev_filter *f, int dev_scan);
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void dev_iter_destroy(struct dev_iter *iter);
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struct device *dev_iter_get(struct dev_iter *iter);
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void dev_reset_error_count(struct cmd_context *cmd);
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#endif
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