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vg_read: reuse already parsed config tree

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When parsing VG metadata we can create from a single config tree
also 'vg_committed' that is always created for writable VG.

This avoids extra uncessary step of serializing and deserilizing
just parsed VG.
This commit is contained in:
Zdenek Kabelac 2021-03-05 23:04:44 +01:00
parent bc0cb66304
commit 936c7b5104
4 changed files with 12 additions and 9 deletions
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5
lib/format_text/import.c
View File

@ -186,6 +186,8 @@ struct volume_group *text_read_metadata(struct format_instance *fid,
goto_out;
(*vsn)->read_desc(vg->vgmem, cft, when, desc);
vg->committed_cft = cft; /* Reuse CFT for recreation of committed VG */
cft = NULL;
break;
}
@ -198,7 +200,8 @@ struct volume_group *text_read_metadata(struct format_instance *fid,
*use_previous_vg = 0;
out:
config_destroy(cft);
if (cft)
config_destroy(cft);
return vg;
}

10
lib/metadata/metadata.c
View File

@ -5186,8 +5186,6 @@ struct volume_group *vg_read(struct cmd_context *cmd, const char *vg_name, const
* FIXME: be specific about exactly when this works correctly.
*/
if (writing) {
struct dm_config_tree *cft;
if (dm_pool_locked(vg->vgmem)) {
/* FIXME: can this happen? */
log_warn("WARNING: vg_read no vg copy: pool locked.");
@ -5208,15 +5206,15 @@ struct volume_group *vg_read(struct cmd_context *cmd, const char *vg_name, const
vg->vg_precommitted = NULL;
}
if (!(cft = export_vg_to_config_tree(vg))) {
if (!vg->committed_cft) {
log_warn("WARNING: vg_read no vg copy: copy export failed.");
goto out;
if (!(vg->committed_cft = export_vg_to_config_tree(vg)))
goto out;
}
if (!(vg->vg_committed = import_vg_from_config_tree(cmd, vg->fid, cft)))
if (!(vg->vg_committed = import_vg_from_config_tree(cmd, vg->fid, vg->committed_cft)))
log_warn("WARNING: vg_read no vg copy: copy import failed.");
dm_config_destroy(cft);
} else {
if (vg->vg_precommitted)
log_error(INTERNAL_ERROR "vg_read vg %p vg_precommitted %p", (void *)vg, (void *)vg->vg_precommitted);

2
lib/metadata/vg.c
View File

@ -79,6 +79,8 @@ static void _free_vg(struct volume_group *vg)
log_debug_mem("Freeing VG %s at %p.", vg->name ? : "<no name>", (void *)vg);
if (vg->committed_cft)
config_destroy(vg->committed_cft);
dm_hash_destroy(vg->hostnames);
dm_pool_destroy(vg->vgmem);
}

4
lib/metadata/vg.h
View File

@ -50,9 +50,9 @@ struct volume_group {
* The parsed committed (on-disk) copy of this VG; is NULL if this VG is committed
* version (i.e. vg_committed == NULL *implies* this is the committed copy,
* there is no guarantee that if this VG is the same as the committed one
* this will be NULL). The pointer is maintained by calls to
* _vg_update_vg_committed.
* this will be NULL). The pointer is maintained by calls to vg_write & vg_commit
*/
struct dm_config_tree *committed_cft;
struct volume_group *vg_committed;
struct volume_group *vg_precommitted;