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a6fdb9d9d7
When snapshot is created in read-only mode with 'lvcreate -s -pr...', lvm2 still needs to be able to write to layered -cow volume to store metadata and exceptions blocks. TODO: in some case we might be able to do full tree with read-only volume but this probably needs futher validation: 1. checking snapshot header already exist 2. origin & snapshot are both in read-only mode.
102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2012 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_MANAGER_H
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#define _LVM_DEV_MANAGER_H
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#include "metadata-exported.h"
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struct logical_volume;
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struct lv_activate_opts;
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struct volume_group;
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struct cmd_context;
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struct dev_manager;
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struct dm_info;
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struct device;
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struct lv_seg_status;
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int read_only_lv(const struct logical_volume *lv, const struct lv_activate_opts *laopts, const char *layer);
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/*
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* Constructor and destructor.
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*/
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struct dev_manager *dev_manager_create(struct cmd_context *cmd,
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const char *vg_name,
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unsigned track_pvmove_deps);
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void dev_manager_destroy(struct dev_manager *dm);
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void dev_manager_release(void);
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void dev_manager_exit(void);
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/*
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* The device handler is responsible for creating all the layered
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* dm devices, and ensuring that all constraints are maintained
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* (eg, an origin is created before its snapshot, but is not
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* unsuspended until the snapshot is also created.)
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*/
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int dev_manager_info(struct cmd_context *cmd, const struct logical_volume *lv,
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const char *layer,
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int with_open_count, int with_read_ahead,
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struct dm_info *dminfo, uint32_t *read_ahead,
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struct lv_seg_status *seg_status);
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int dev_manager_snapshot_percent(struct dev_manager *dm,
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const struct logical_volume *lv,
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dm_percent_t *percent);
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int dev_manager_mirror_percent(struct dev_manager *dm,
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const struct logical_volume *lv, int wait,
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dm_percent_t *percent, uint32_t *event_nr);
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int dev_manager_raid_status(struct dev_manager *dm,
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const struct logical_volume *lv,
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struct dm_status_raid **status);
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int dev_manager_raid_message(struct dev_manager *dm,
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const struct logical_volume *lv,
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const char *msg);
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int dev_manager_cache_status(struct dev_manager *dm,
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const struct logical_volume *lv,
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struct lv_status_cache **status);
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int dev_manager_thin_pool_status(struct dev_manager *dm,
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const struct logical_volume *lv,
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struct dm_status_thin_pool **status,
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int flush);
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int dev_manager_thin_pool_percent(struct dev_manager *dm,
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const struct logical_volume *lv,
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int metadata, dm_percent_t *percent);
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int dev_manager_thin_percent(struct dev_manager *dm,
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const struct logical_volume *lv,
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int mapped, dm_percent_t *percent);
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int dev_manager_thin_device_id(struct dev_manager *dm,
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const struct logical_volume *lv,
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uint32_t *device_id);
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int dev_manager_suspend(struct dev_manager *dm, const struct logical_volume *lv,
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struct lv_activate_opts *laopts, int lockfs, int flush_required);
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int dev_manager_activate(struct dev_manager *dm, const struct logical_volume *lv,
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struct lv_activate_opts *laopts);
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int dev_manager_preload(struct dev_manager *dm, const struct logical_volume *lv,
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struct lv_activate_opts *laopts, int *flush_required);
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int dev_manager_deactivate(struct dev_manager *dm, const struct logical_volume *lv);
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int dev_manager_transient(struct dev_manager *dm, const struct logical_volume *lv) __attribute__((nonnull(1, 2)));
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int dev_manager_mknodes(const struct logical_volume *lv);
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/*
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* Put the desired changes into effect.
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*/
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int dev_manager_execute(struct dev_manager *dm);
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int dev_manager_device_uses_vg(struct device *dev,
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struct volume_group *vg);
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#endif
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