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fs: dlm: update comments about recovery and membership handling 

Make clear that a particular recovery iteration must not be aborted
before membership changes are applied to the members list (ls_nodes)
and midcomms layer.  Interrupting recovery before this can result
in missing node-specific changes in midcomms or through lsops.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2022-06-22 14:45:13 -04:00 committed by David Teigland
parent 5d92a30e90
commit ca8031d917
2 changed files with 9 additions and 1 deletions
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6
fs/dlm/member.c
View File

@ -534,7 +534,11 @@ int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv, int *neg_out)
int i, error, neg = 0, low = -1;
/* previously removed members that we've not finished removing need to
count as a negative change so the "neg" recovery steps will happen */
* count as a negative change so the "neg" recovery steps will happen
*
* This functionality must report all member changes to lsops or
* midcomms layer and must never return before.
*/
list_for_each_entry(memb, &ls->ls_nodes_gone, list) {
log_rinfo(ls, "prev removed member %d", memb->nodeid);

4
fs/dlm/recoverd.c
View File

@ -70,6 +70,10 @@ static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
/*
* Add or remove nodes from the lockspace's ls_nodes list.
*
* Due to the fact that we must report all membership changes to lsops
* or midcomms layer, it is not permitted to abort ls_recover() until
* this is done.
*/
error = dlm_recover_members(ls, rv, &neg);