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lvmlockd: skip unnecessary lvmetad cache update

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In cases where a VG is reread from disk, but the
seqno matches what is currently in lvmetad, the
metadata in lvmetad doesn't need to be updated.
This commit is contained in:
David Teigland 2016-04-14 13:45:10 -05:00
parent 50633039bf
commit a400eba174
1 changed files with 18 additions and 12 deletions
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22
lib/cache/lvmetad.c vendored
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@ -872,7 +872,7 @@ struct volume_group *lvmetad_vg_lookup(struct cmd_context *cmd, const char *vgna
} else {
log_error(INTERNAL_ERROR "VG name required (VGID not available)");
goto out;
return NULL;
}
if (_lvmetad_handle_reply(reply, "vg_lookup", diag_name, &found) && found) {
@ -958,16 +958,14 @@ struct volume_group *lvmetad_vg_lookup(struct cmd_context *cmd, const char *vgna
* invalidated the cached vg.
*/
if (rescan) {
log_debug_lvmetad("Update invalid lvmetad cache for VG %s", vgname);
vg2 = lvmetad_pvscan_vg(cmd, vg);
release_vg(vg);
vg = vg2;
if (!vg) {
if (!(vg2 = lvmetad_pvscan_vg(cmd, vg))) {
log_debug_lvmetad("VG %s from lvmetad not found during rescan.", vgname);
fid = NULL;
goto out;
} else
fid = vg->fid;
}
release_vg(vg);
vg = vg2;
fid = vg2->fid;
}
dm_list_iterate_items(pvl, &vg->pvs) {
@ -1575,6 +1573,7 @@ static struct volume_group *lvmetad_pvscan_vg(struct cmd_context *cmd, struct vo
struct format_instance_ctx fic = { .type = 0 };
struct _lvmetad_pvscan_baton baton;
struct device *save_dev = NULL;
uint32_t save_seqno = 0;
dm_list_iterate_items(pvl, &vg->pvs) {
/* missing pv */
@ -1622,6 +1621,9 @@ static struct volume_group *lvmetad_pvscan_vg(struct cmd_context *cmd, struct vo
continue;
}
if (!save_seqno)
save_seqno = baton.vg->seqno;
if (!(vgmeta = export_vg_to_config_tree(baton.vg))) {
log_error("VG export to config tree failed");
release_vg(baton.vg);
@ -1661,10 +1663,14 @@ static struct volume_group *lvmetad_pvscan_vg(struct cmd_context *cmd, struct vo
* but that is the field which lvmetad_vg_update() uses
* to send the metadata cft to lvmetad.
*/
if (save_seqno != vg->seqno) {
log_debug_lvmetad("Update lvmetad from seqno %u to seqno %u for VG %s",
vg->seqno, save_seqno, vg->name);
vg_ret->cft_precommitted = vgmeta_ret;
if (!lvmetad_vg_update(vg_ret))
log_error("Failed to update lvmetad with new VG meta");
vg_ret->cft_precommitted = NULL;
}
dm_config_destroy(vgmeta_ret);
}
out: