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Refactor code for _lv_postoder

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Add _lv_postorder_vg() - for calling _lv_postorder() for every LV from VG.
We use this in 2 places -  vg_mark_partial_lvs() and vg_validate()
so make it as a one function.

Benefit here is - to use only one cleanup code and avoid
potentially duplicate scans of same LVs.
This commit is contained in:
Zdenek Kabelac 2011-03-10 14:40:32 +00:00
parent 0a1d29b1d3
commit 442dbf9ad8
2 changed files with 29 additions and 15 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.85 -
===================================
Add _lv_postorder_vg() to improve efficiency for all LVs in VG.
Use hash tables to speedup string search in validate_vg().
Refactor allocation of VG structure, add alloc_vg().
Avoid possible endless loop in _free_vginfo when 4 or more VGs have same name.

41
lib/metadata/metadata.c
View File

@ -2039,6 +2039,29 @@ static int _lv_postorder(struct logical_volume *lv,
return r;
}
/*
* Calls _lv_postorder() on each LV from VG. Avoids duplicate transitivity visits.
* Clears with _lv_postorder_cleanup() when all LVs were visited by postorder.
*/
static int _lv_postorder_vg(struct volume_group *vg,
int (*fn)(struct logical_volume *lv, void *data),
void *data)
{
struct lv_list *lvl;
int r = 1;
dm_list_iterate_items(lvl, &vg->lvs)
if (!_lv_postorder_visit(lvl->lv, fn, data)) {
stack;
r = 0;
}
dm_list_iterate_items(lvl, &vg->lvs)
_lv_postorder_cleanup(lvl->lv, 0);
return r;
}
struct _lv_mark_if_partial_baton {
int partial;
};
@ -2076,11 +2099,6 @@ static int _lv_mark_if_partial_single(struct logical_volume *lv, void *data)
return 1;
}
static int _lv_mark_if_partial(struct logical_volume *lv)
{
return _lv_postorder(lv, _lv_mark_if_partial_single, NULL);
}
/*
* Mark LVs with missing PVs using PARTIAL_LV status flag. The flag is
* propagated transitively, so LVs referencing other LVs are marked
@ -2088,14 +2106,9 @@ static int _lv_mark_if_partial(struct logical_volume *lv)
*/
int vg_mark_partial_lvs(struct volume_group *vg)
{
struct logical_volume *lv;
struct lv_list *lvl;
dm_list_iterate_items(lvl, &vg->lvs) {
lv = lvl->lv;
if (!_lv_mark_if_partial(lv))
if (!_lv_postorder_vg(vg, _lv_mark_if_partial_single, NULL))
return_0;
}
return 1;
}
@ -2378,8 +2391,8 @@ int vg_validate(struct volume_group *vg)
dm_hash_destroy(lvname_hash);
dm_hash_destroy(lvid_hash);
dm_list_iterate_items(lvl, &vg->lvs) {
if (!_lv_postorder(lvl->lv, _lv_validate_references_single, NULL))
if (!_lv_postorder_vg(vg, _lv_validate_references_single, NULL)) {
stack;
r = 0;
}