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b35fb0b15a
I've changed build_parallel_areas_from_lv to take a new parameter that allows the caller to build parallel areas by LV vs by segment. Previously, the function created a list of parallel areas for each segment in the given LV. When it came time for allocation, the parallel areas were honored on a segment basis. This was problematic for RAID because any new RAID image must avoid being placed on any PVs used by other images in the RAID. For example, if we have a linear LV that has half its space on one PV and half on another, we do not want an up-convert to use either of those PVs. It should especially not wind up with the following, where the first portion of one LV is paired up with the second portion of the other: ------PV1------- ------PV2------- [ 2of2 image_1 ] [ 1of2 image_1 ] [ 1of2 image_0 ] [ 2of2 image_0 ] ---------------- ---------------- Previously, it was possible for this to happen. The change makes it so that the returned parallel areas list contains one "super" segment (seg_pvs) with a list of all the PVs from every actual segment in the given LV and covering the entire logical extent range. This change allows RAID conversions to function properly when there are existing images that contain multiple segments that span more than one PV.
93 lines
3.5 KiB
C
93 lines
3.5 KiB
C
/*
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* Copyright (C) 2003-2004 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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uint64_t status,
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uint32_t stripe_size,
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struct logical_volume *log_lv,
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struct logical_volume *thin_pool_lv,
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uint32_t area_count,
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uint32_t area_len,
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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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struct lv_segment *alloc_snapshot_seg(struct logical_volume *lv,
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uint64_t status, uint32_t old_le_count);
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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,
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const struct segment_type *segtype,
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const char *thin_pool_name);
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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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