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cache: support activation of empty cache-pool

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When the cache pool is unused, lvm2 code will internally
allow to activate such cache-pool.

Cache-pool is activate as metadata LV, so lvm2 could easily
wipe such volume before cache-pool is reused.
This commit is contained in:
Zdenek Kabelac 2014-11-02 19:34:50 +01:00
parent ab49120465
commit 29bd3cccc8
1 changed files with 16 additions and 8 deletions
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24
lib/activate/dev_manager.c
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@ -1867,12 +1867,15 @@ static int _add_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
const char *uuid;
if (lv_is_cache_pool(lv)) {
/* origin_only is ignored */
/* cache pool is 'meta' LV and does not have a real device node */
if (!_add_lv_to_dtree(dm, dtree, seg_lv(first_seg(lv), 0), 0))
return_0;
if (!_add_lv_to_dtree(dm, dtree, first_seg(lv)->metadata_lv, 0))
return_0;
if (!dm_list_empty(&lv->segs_using_this_lv)) {
/* origin_only is ignored */
/* cache pool is 'meta' LV and does not have a real device node */
if (!_add_lv_to_dtree(dm, dtree, seg_lv(first_seg(lv), 0), 0))
return_0;
if (!_add_lv_to_dtree(dm, dtree, first_seg(lv)->metadata_lv, 0))
return_0;
} else if (!_add_dev_to_dtree(dm, dtree, lv, NULL))
return_0; /* For internal use - empty pool makes meta visible */
return 1;
}
@ -2560,7 +2563,8 @@ static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
uint32_t read_ahead = lv->read_ahead;
uint32_t read_ahead_flags = UINT32_C(0);
if (lv_is_cache_pool(lv)) {
if (lv_is_cache_pool(lv) &&
!dm_list_empty(&lv->segs_using_this_lv)) {
/* cache pool is 'meta' LV and does not have a real device node */
if (!_add_new_lv_to_dtree(dm, dtree, seg_lv(first_seg(lv), 0), laopts, NULL))
return_0;
@ -2637,6 +2641,10 @@ static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
/* Create table */
dm->pvmove_mirror_count = 0u;
/* This is unused cache-pool - make metadata accessible */
if (lv_is_cache_pool(lv))
lv = first_seg(lv)->metadata_lv;
/* If this is a snapshot origin, add real LV */
/* If this is a snapshot origin + merging snapshot, add cow + real LV */
/* Snapshot origin could be also external origin */
@ -2853,7 +2861,7 @@ static int _tree_action(struct dev_manager *dm, const struct logical_volume *lv,
/* Some LV can be used for top level tree */
/* TODO: add more.... */
if (lv_is_cache_pool(lv)) {
if (lv_is_cache_pool(lv) && !dm_list_empty(&lv->segs_using_this_lv)) {
log_error(INTERNAL_ERROR "Cannot create tree for %s.", lv->name);
return 0;
}