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e2354ea344
In order to support striped raid5/6/10 LV reshaping (change of LV type, stripesize or number of legs), this patch introduces infrastructure prerequisites to be used by raid_manip.c extensions in followup patches. This base is needed for allocation of out-of-place reshape space required by the MD raid personalities to avoid writing over data in-place when reading off the current RAID layout or number of legs and writing out the new layout or to a different number of legs (i.e. restripe) Changes: - add members reshape_len to 'struct lv_segment' to store out-of-place reshape length per component rimage - add member data_copies to struct lv_segment to support more than 2 raid10 data copies - make alloc_lv_segment() aware of both reshape_len and data_copies - adjust all alloc_lv_segment() callers to the new API - add functions to retrieve the current data offset (needed for out-of-place reshaping space allocation) and the devices count from the kernel - make libdm deptree code aware of reshape_len - add LV flags for disk add/remove reshaping - support import/export of the new 'struct lv_segment' members - enhance lv_extend/_lv_reduce to cope with reshape_len - add seg_is_*/segtype_is_* macros related to reshaping - add target version check for reshaping - grow rebuilds/writemostly bitmaps to 246 bit to support kernel maximal - enhance libdm deptree code to support data_offset (out-of-place reshaping) and delta_disk (legs add/remove reshaping) target arguments Related: rhbz834579 Related: rhbz1191935 Related: rhbz1191978
89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
/*
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* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2017 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_LV_ALLOC_H
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#define _LVM_LV_ALLOC_H
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#include "metadata-exported.h"
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struct lv_segment *alloc_lv_segment(const struct segment_type *segtype,
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struct logical_volume *lv,
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uint32_t le, uint32_t len,
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uint32_t reshape_len,
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uint64_t status,
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uint32_t stripe_size,
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struct logical_volume *log_lv,
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uint32_t area_count,
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uint32_t area_len,
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uint32_t data_copies,
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uint32_t chunk_size,
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uint32_t region_size,
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uint32_t extents_copied,
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struct lv_segment *pvmove_source_seg);
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int set_lv_segment_area_pv(struct lv_segment *seg, uint32_t area_num,
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struct physical_volume *pv, uint32_t pe);
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int set_lv_segment_area_lv(struct lv_segment *seg, uint32_t area_num,
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struct logical_volume *lv, uint32_t le,
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uint64_t status);
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int move_lv_segment_area(struct lv_segment *seg_to, uint32_t area_to,
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struct lv_segment *seg_from, uint32_t area_from);
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int release_lv_segment_area(struct lv_segment *seg, uint32_t s,
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uint32_t area_reduction);
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int release_and_discard_lv_segment_area(struct lv_segment *seg, uint32_t s, uint32_t area_reduction);
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struct alloc_handle;
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struct alloc_handle *allocate_extents(struct volume_group *vg,
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struct logical_volume *lv,
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const struct segment_type *segtype,
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uint32_t stripes,
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uint32_t mirrors, uint32_t log_count,
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uint32_t log_region_size, uint32_t extents,
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struct dm_list *allocatable_pvs,
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alloc_policy_t alloc, int approx_alloc,
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struct dm_list *parallel_areas);
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int lv_add_segment(struct alloc_handle *ah,
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uint32_t first_area, uint32_t num_areas,
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struct logical_volume *lv,
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const struct segment_type *segtype,
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uint32_t stripe_size,
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uint64_t status,
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uint32_t region_size);
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int lv_add_mirror_areas(struct alloc_handle *ah,
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struct logical_volume *lv, uint32_t le,
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uint32_t region_size);
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int lv_add_segmented_mirror_image(struct alloc_handle *ah,
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struct logical_volume *lv, uint32_t le,
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uint32_t region_size);
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int lv_add_mirror_lvs(struct logical_volume *lv,
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struct logical_volume **sub_lvs,
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uint32_t num_extra_areas,
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uint64_t status, uint32_t region_size);
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int lv_add_log_segment(struct alloc_handle *ah, uint32_t first_area,
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struct logical_volume *log_lv, uint64_t status);
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int lv_add_virtual_segment(struct logical_volume *lv, uint64_t status,
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uint32_t extents, const struct segment_type *segtype);
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void alloc_destroy(struct alloc_handle *ah);
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struct dm_list *build_parallel_areas_from_lv(struct logical_volume *lv,
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unsigned use_pvmove_parent_lv,
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unsigned create_single_list);
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#endif
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