The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear 
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.31
------>
commit 0acd8053359b2ede1aee9f664d96a7c77b7db69b
Author: Kirill Tkhai <[email protected]>
Date:   Mon May 24 12:02:30 2021 +0300

    ploop: Add synonim for "get_delta_name"
    
    Delta is a term of ploop. To fit generic interface
    for other types of images, rename it to "get_img_name".
    
    Signed-off-by: Kirill Tkhai <[email protected]>
---
 drivers/md/dm-ploop-cmd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-ploop-cmd.c b/drivers/md/dm-ploop-cmd.c
index 063a687ecdf4..63cca8ab0e05 100644
--- a/drivers/md/dm-ploop-cmd.c
+++ b/drivers/md/dm-ploop-cmd.c
@@ -1565,7 +1565,9 @@ void process_deferred_cmd(struct ploop *ploop, struct 
ploop_index_wb *piwb)
 
 static bool msg_wants_down_read(const char *cmd)
 {
+       /* TODO: kill get_delta_name */
        if (!strcmp(cmd, "get_delta_name") ||
+           !strcmp(cmd, "get_img_name") ||
            !strcmp(cmd, "push_backup_get_uuid") ||
            !strcmp(cmd, "push_backup_read") ||
            !strcmp(cmd, "push_backup_write"))
@@ -1610,7 +1612,8 @@ int ploop_message(struct dm_target *ti, unsigned int 
argc, char **argv,
                if (argc != 2 || kstrtou64(argv[1], 10, &val) < 0)
                        goto unlock;
                ret = ploop_notify_merged(ploop, val, forward);
-       } else if (!strcmp(argv[0], "get_delta_name")) {
+       } else if (!strcmp(argv[0], "get_delta_name") ||
+                  !strcmp(argv[0], "get_img_name")) {
                if (argc != 2 || kstrtou64(argv[1], 10, &val) < 0)
                        goto unlock;
                ret = ploop_get_delta_name_cmd(ploop, (u8)val, result, maxlen);
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