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thin: check for new pool before creating thin volume

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Call check_new_thin_pool() to detect in-use thin-pool.
Save extra reactivation of thin-pool when thin pool is not active.
(it's now a bit more expensive to invoke thin_check for new pools.)

For new pools:

We now active locally exclusively thin-pool as 'public' LV.
Validate transaction_id is till 0.
Deactive.
Prepare create message for thin-pool and exclusively active pool.
Active new thin LV.
And deactivate thin pool if it used to be inactive.
This commit is contained in:
Zdenek Kabelac 2014-11-04 15:08:15 +01:00
parent 6116b1d6e3
commit 8563c3e1a9
2 changed files with 36 additions and 2 deletions
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1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.112 -
=====================================
Inital support for external users of thin pools based on transaction_id.
Report some basic percentage info for cache pools.
Introduce size_mb_arg_with_percent() for advanced size arg reading.
Add extra support for '.' as decimal point in size args.

37
lib/metadata/lv_manip.c
View File

@ -6559,6 +6559,7 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg,
struct logical_volume *pool_lv = NULL;
struct logical_volume *tmp_lv;
struct lv_segment *seg, *pool_seg;
int thin_pool_was_active = -1; /* not scanned, inactive, active */
if (new_lv_name && find_lv_in_vg(vg, new_lv_name)) {
log_error("Logical volume \"%s\" already exists in "
@ -6679,6 +6680,14 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg,
}
}
if (seg_is_thin_volume(lp) &&
lv_is_new_thin_pool(pool_lv)) {
thin_pool_was_active = lv_is_active(pool_lv);
if (!check_new_thin_pool(pool_lv))
return_NULL;
/* New pool is now inactive */
}
if (seg_is_cache(lp) &&
!wipe_cache_pool(pool_lv))
return_NULL;
@ -7003,7 +7012,7 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg,
goto revert_new_lv;
}
/* At this point remove pool messages, snapshot is active */
if (!update_pool_lv(first_seg(origin_lv)->pool_lv, 0)) {
if (!update_pool_lv(pool_lv, 0)) {
stack;
goto revert_new_lv;
}
@ -7013,7 +7022,23 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg,
}
if (is_change_activating(lp->activate)) {
/* Send message so that table preload knows new thin */
if (!update_pool_lv(first_seg(lv)->pool_lv, 1)) {
if (!lv_is_active(pool_lv)) {
/* Avoid multiple thin-pool activations in this case */
if (thin_pool_was_active < 0)
thin_pool_was_active = 0;
if (!activate_lv_excl(cmd, pool_lv)) {
log_error("Failed to activate thin pool %s/%s.",
origin_lv->vg->name, origin_lv->name);
goto revert_new_lv;
}
if (!lv_is_active(pool_lv)) {
log_error("Cannot activate thin pool %s, perhaps skipped in lvm.conf volume_list?",
display_lvname(pool_lv));
return 0;
}
}
/* Keep thin pool active until thin volume is activated */
if (!update_pool_lv(pool_lv, (thin_pool_was_active < 0) ? 1 : 0)) {
stack;
goto revert_new_lv;
}
@ -7024,6 +7049,14 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg,
log_error("Failed to activate thin %s.", lv->name);
goto deactivate_and_revert_new_lv;
}
/* Restore inactive state if needed */
if (!thin_pool_was_active &&
!deactivate_lv(cmd, pool_lv)) {
log_error("Failed to deactivate thin pool %s.",
display_lvname(pool_lv));
return NULL;
}
}
} else if (lp->snapshot) {
if (!activate_lv_local(cmd, lv)) {