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111 lines
3.9 KiB
C
111 lines
3.9 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 "lib/device/device.h"
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#include "lib/device/dev-type.h"
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#include "lib/misc/lvm-wrappers.h"
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struct cmd_context;
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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 cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name);
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void (*destroy) (struct dev_filter *f);
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void (*wipe) (struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name);
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void *private;
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unsigned use_count;
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const char *name;
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};
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void dev_init(struct device *dev);
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struct dm_list *dev_cache_get_dev_list_for_vgid(const char *vgid);
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struct dm_list *dev_cache_get_dev_list_for_lvid(const char *lvid);
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/*
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* The cache of dm devices is enabled when the kernel
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* supports the ability to quickly report on many dm
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* devs together, in which case we can get all the dm
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* info at once and store it in this dm_devs_cache.
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* This avoids many individual dm dev ioctl calls.
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* The callers of these dm_devs_cache functions must
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* have an alternative for when dm_devs_cache_use()
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* returns 0.
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*/
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int dm_devs_cache_use(void);
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int dm_devs_cache_update(void);
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void dm_devs_cache_destroy(void);
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void dm_devs_cache_label_invalidate(struct cmd_context *cmd);
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const struct dm_active_device *
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dm_devs_cache_get_by_devno(struct cmd_context *cmd, dev_t devno);
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const struct dm_active_device *
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dm_devs_cache_get_by_uuid(struct cmd_context *cmd, const char *dm_uuid);
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/*
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* The global device cache.
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*/
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int dev_cache_init(struct cmd_context *cmd);
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int dev_cache_exit(void);
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/*
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* Returns number of open devices.
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*/
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int dev_cache_check_for_open_devices(void);
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void dev_cache_scan(struct cmd_context *cmd);
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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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struct device *dev_cache_get(struct cmd_context *cmd, const char *name, struct dev_filter *f);
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struct device *dev_cache_get_existing(struct cmd_context *cmd, const char *name, struct dev_filter *f);
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struct device *dev_cache_get_by_devt(struct cmd_context *cmd, dev_t devt);
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struct device *dev_cache_get_by_pvid(struct cmd_context *cmd, const char *pvid);
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void dev_cache_verify_aliases(struct device *dev);
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struct device *dev_cache_get_dev_by_name(const char *name);
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void dev_set_preferred_name(struct dm_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 unused);
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void dev_iter_destroy(struct dev_iter *iter);
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struct device *dev_iter_get(struct cmd_context *cmd, struct dev_iter *iter);
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void dev_cache_failed_path(struct device *dev, const char *path);
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bool dev_cache_has_md_with_end_superblock(struct dev_types *dt);
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int get_sysfs_value(const char *path, char *buf, size_t buf_size, int error_if_no_value);
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int get_sysfs_binary(const char *path, char *buf, size_t buf_size, int *retlen);
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int setup_devices_file(struct cmd_context *cmd);
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int setup_devices(struct cmd_context *cmd);
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int setup_device(struct cmd_context *cmd, const char *devname);
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int setup_devices_for_online_autoactivation(struct cmd_context *cmd);
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int setup_devname_in_dev_cache(struct cmd_context *cmd, const char *devname);
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int setup_devno_in_dev_cache(struct cmd_context *cmd, dev_t devno);
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struct device *setup_dev_in_dev_cache(struct cmd_context *cmd, dev_t devno, const char *devname);
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#endif
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