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dm: migration_threshold for old linked tools

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Just like with precending  lvm2 device_mapper patch, ensure
that old users of libdm will also get fixed migration threshold
for caches.
This commit is contained in:
Zdenek Kabelac 2019-01-20 11:45:27 +01:00
parent 30a3dda9d6
commit 74ae1c5bc1
2 changed files with 18 additions and 3 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.155 -
====================================
Ensure migration_threshold for cache is at least 8 chunks.
Include correct internal header inside libdm list.c.
Enhance ioctl flattening and add parameters only when needed.
Add DM_DEVICE_ARM_POLL for API completness matching kernel.

16
libdm/libdm-deptree.c
View File

@ -192,6 +192,7 @@ struct load_segment {
uint64_t transaction_id; /* Thin_pool */
uint64_t low_water_mark; /* Thin_pool */
uint32_t data_block_size; /* Thin_pool + cache */
uint32_t migration_threshold; /* Cache */
unsigned skip_block_zeroing; /* Thin_pool */
unsigned ignore_discard; /* Thin_pool target vsn 1.1 */
unsigned no_discard_passdown; /* Thin_pool target vsn 1.1 */
@ -2462,9 +2463,13 @@ static int _cache_emit_segment_line(struct dm_task *dmt,
EMIT_PARAMS(pos, " %s", name);
EMIT_PARAMS(pos, " %u", seg->policy_argc * 2);
/* Do not pass migration_threshold 2048 which is default */
EMIT_PARAMS(pos, " %u", (seg->policy_argc + (seg->migration_threshold != 2048) ? 1 : 0) * 2);
if (seg->migration_threshold != 2048)
EMIT_PARAMS(pos, " migration_threshold %u", seg->migration_threshold);
if (seg->policy_settings)
for (cn = seg->policy_settings->child; cn; cn = cn->sib)
if (cn->v) /* Skip deleted entry */
EMIT_PARAMS(pos, " %s %" PRIu64, cn->key, cn->v->v.i);
return 1;
@ -3373,6 +3378,7 @@ int dm_tree_node_add_cache_target(struct dm_tree_node *node,
seg->data_block_size = data_block_size;
seg->flags = feature_flags;
seg->policy_name = policy_name;
seg->migration_threshold = 2048; /* Default migration threshold 1MiB */
/* FIXME: better validation missing */
if (policy_settings) {
@ -3385,10 +3391,18 @@ int dm_tree_node_add_cache_target(struct dm_tree_node *node,
log_error("Cache policy parameter %s is without integer value.", cn->key);
return 0;
}
if (strcmp(cn->key, "migration_threshold") == 0) {
seg->migration_threshold = cn->v->v.i;
cn->v = NULL; /* skip this entry */
} else
seg->policy_argc++;
}
}
/* Always some throughput available for cache to proceed */
if (seg->migration_threshold < data_block_size * 8)
seg->migration_threshold = data_block_size * 8;
return 1;
}