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libdm: better code to enforce writethrough

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Better code to enforce writethrough caching for cleaner policy.
Only check for cleaner when DM_CACHE_FEATURE_PASSTHROUGH or
DM_CACHE_FEATURE_WRITEBACK is set.
This commit is contained in:
Zdenek Kabelac 2017-02-23 23:35:40 +01:00
parent edf5e43f9a
commit bf79fb1a33
2 changed files with 21 additions and 14 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.138 -
=====================================
Improve code to handle mode mask for cache nodes.
Cache status check for passthrough also require trailing space.
Add extra memory page when limiting pthread stack size in dmeventd.
Avoids immediate resume when preloaded device is smaller.

34
libdm/libdm-deptree.c
View File

@ -3398,19 +3398,26 @@ int dm_tree_node_add_cache_target(struct dm_tree_node *node,
{
struct dm_config_node *cn;
struct load_segment *seg;
static const uint64_t _modemask =
DM_CACHE_FEATURE_PASSTHROUGH |
DM_CACHE_FEATURE_WRITETHROUGH |
DM_CACHE_FEATURE_WRITEBACK;
switch (feature_flags &
(DM_CACHE_FEATURE_PASSTHROUGH |
DM_CACHE_FEATURE_WRITETHROUGH |
DM_CACHE_FEATURE_WRITEBACK)) {
case DM_CACHE_FEATURE_PASSTHROUGH:
case DM_CACHE_FEATURE_WRITETHROUGH:
case DM_CACHE_FEATURE_WRITEBACK:
break;
default:
log_error("Invalid cache's feature flag " FMTu64 ".",
feature_flags);
return 0;
switch (feature_flags & _modemask) {
case DM_CACHE_FEATURE_PASSTHROUGH:
case DM_CACHE_FEATURE_WRITEBACK:
if (strcmp(policy_name, "cleaner") == 0) {
/* Enforce writethrough mode for cleaner policy */
feature_flags = ~_modemask;
feature_flags |= DM_CACHE_FEATURE_WRITETHROUGH;
}
/* Fall through */
case DM_CACHE_FEATURE_WRITETHROUGH:
break;
default:
log_error("Invalid cache's feature flag " FMTu64 ".",
feature_flags);
return 0;
}
if (data_block_size < DM_CACHE_MIN_DATA_BLOCK_SIZE) {
@ -3456,8 +3463,7 @@ int dm_tree_node_add_cache_target(struct dm_tree_node *node,
return_0;
seg->data_block_size = data_block_size;
/* Enforce WriteThough mode for cleaner policy */
seg->flags = (strcmp(policy_name, "cleaner") == 0) ? DM_CACHE_FEATURE_WRITETHROUGH : feature_flags;
seg->flags = feature_flags;
seg->policy_name = policy_name;
/* FIXME: better validation missing */