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libdm: enhance thin-pool preload

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When preloading thin-pool device node for already
existing/running thin-pool do not resume such thin-pool.

This allows to properly schedule commit point for metadata,
when thin-pool data or metadata volume is resized.
This commit is contained in:
Zdenek Kabelac 2015-11-23 23:15:04 +01:00
parent ddbf0075b1
commit 6ca5447e0c
2 changed files with 18 additions and 0 deletions
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1
WHATS_NEW_DM
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@ -1,5 +1,6 @@
Version 1.02.112 -
=====================================
Improve preloading sequence of an active thin-pool target.
Drop extra space from cache target line to fix unneded table reloads.
Version 1.02.111 - 23rd November 2015

17
libdm/libdm-deptree.c
View File

@ -2788,6 +2788,7 @@ int dm_tree_preload_children(struct dm_tree_node *dnode,
struct dm_tree_node *child;
struct dm_info newinfo;
int update_devs_flag = 0;
struct load_segment *seg;
/* Preload children first */
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
@ -2835,6 +2836,22 @@ int dm_tree_preload_children(struct dm_tree_node *dnode,
if (!dm_tree_node_num_children(child, 1) || !child->props.size_changed)
continue;
if (!node_created && (dm_list_size(&child->props.segs) == 1)) {
/* If thin-pool child nodes were preloaded WITH changed size
* skip device resume, as this is likely resize of data or
* metadata device and so thin pool needs suspend before
* resume operation.
* Note: child->props.segment_count is already 0 here
*/
seg = dm_list_item(dm_list_last(&child->props.segs),
struct load_segment);
if (seg->type == SEG_THIN_POOL) {
log_debug_activation("Skipping resume of thin-pool %s.",
child->name);
continue;
}
}
if (!child->info.inactive_table && !child->info.suspended)
continue;