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cache: support vgsplit

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Enable vgsplit to work with VG containing cached LVs.
This commit is contained in:
Zdenek Kabelac 2019-02-01 21:29:22 +01:00
parent 1cc690e911
commit 030c39073e
2 changed files with 41 additions and 51 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.03.02 -
===================================
Add support for vgsplit with cached devices.
Query mpath device only once per command for its state.
Use device INFO instead of STATUS when checking for mpath device uuid.
Change default io_memory_size from 4 to 8 MiB.

91
tools/vgsplit.c
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@ -1,6 +1,6 @@
/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2009,2016 Red Hat, Inc. All rights reserved.
* Copyright (C) 2004-2019 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
@ -384,71 +384,60 @@ static int _move_cache(struct volume_group *vg_from,
dm_list_iterate_safe(lvh, lvht, &vg_from->lvs) {
lv = dm_list_item(lvh, struct lv_list)->lv;
data = meta = orig = NULL;
seg = first_seg(lv);
if (!lv_is_cache(lv) && !lv_is_cache_pool(lv))
continue;
/*
* FIXME: The code seems to move cache LVs fine, but it
* hasn't been well tested and it causes problems
* when just splitting PVs that don't contain
* cache LVs.
* Waiting for next release before fixing and enabling.
*/
log_error("Unable to split VG while it contains cache LVs");
return 0;
/* NOTREACHED */
if (lv_is_cache(lv) && lv_is_cache_vol(seg->pool_lv)) {
log_error("Cannot split while LV %s has cache attached.", display_lvname(lv));
return 0;
} else if (lv_is_cache(lv)) {
}
if (lv_is_cache(lv)) {
orig = seg_lv(seg, 0);
data = seg_lv(first_seg(seg->pool_lv), 0);
meta = first_seg(seg->pool_lv)->metadata_lv;
/* Ensure all components are coming along */
seg = first_seg(seg->pool_lv);
} else { /* lv_is_cache_pool */
orig = NULL;
if (!dm_list_empty(&seg->lv->segs_using_this_lv)) {
if (!(cache_seg = get_only_segment_using_this_lv(seg->lv)))
return_0;
orig = seg_lv(cache_seg, 0);
}
}
data = seg_lv(seg, 0);
meta = seg->metadata_lv;
if ((orig && !lv_is_on_pvs(orig, &vg_to->pvs)) &&
!lv_is_on_pvs(data, &vg_to->pvs) &&
!lv_is_on_pvs(meta, &vg_to->pvs))
continue;
/* Ensure all components are coming along */
if (orig) {
is_moving = _lv_is_in_vg(vg_to, orig);
} else {
if (!dm_list_empty(&seg->lv->segs_using_this_lv) &&
!(cache_seg = get_only_segment_using_this_lv(seg->lv)))
return_0;
orig = seg_lv(cache_seg, 0);
data = seg_lv(seg, 0);
meta = seg->metadata_lv;
if (_lv_is_in_vg(vg_to, data) ||
_lv_is_in_vg(vg_to, meta))
is_moving = 1;
}
if (_lv_is_in_vg(vg_to, data) != is_moving) {
log_error("Cannot split cache origin %s and its cache pool data %s "
"into separate VGs.",
display_lvname(orig), display_lvname(data));
return 0;
}
if (!lv_is_on_pvs(data, &vg_to->pvs))
continue;
if (!lv_is_on_pvs(meta, &vg_to->pvs))
continue;
if (orig && (_lv_is_in_vg(vg_to, orig) != is_moving)) {
log_error("Can't split %s and its origin (%s)"
" into separate VGs", lv->name, orig->name);
if (_lv_is_in_vg(vg_to, meta) != is_moving) {
log_error("Cannot split cache origin %s and its cache pool metadata %s "
"into separate VGs.",
display_lvname(orig), display_lvname(meta));
return 0;
}
} else if (_lv_is_in_vg(vg_to, data) != _lv_is_in_vg(vg_to, meta)) {
log_error("Cannot split cache pool data %s and its metadata %s "
"into separate VGs.",
display_lvname(data), display_lvname(meta));
return 0;
}
if (data && (_lv_is_in_vg(vg_to, data) != is_moving)) {
log_error("Can't split %s and its cache pool"
" data LV (%s) into separate VGs",
lv->name, data->name);
return 0;
}
if (meta && (_lv_is_in_vg(vg_to, meta) != is_moving)) {
log_error("Can't split %s and its cache pool"
" metadata LV (%s) into separate VGs",
lv->name, meta->name);
return 0;
}
if (!_move_one_lv(vg_from, vg_to, lvh, &lvht))
return_0;
}