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dm cache metadata: save in-core policy_hint_size to on-disk superblock
policy_hint_size starts as 0 during __write_initial_superblock(). It isn't until the policy is loaded that policy_hint_size is set in-core (cmd->policy_hint_size). But it never got recorded in the on-disk superblock because __commit_transaction() didn't deal with transfering the in-core cmd->policy_hint_size to the on-disk superblock. The in-core cmd->policy_hint_size gets initialized by metadata_open()'s __begin_transaction_flags() which re-reads all superblock fields. Because the superblock's policy_hint_size was never properly stored, when the cache was created, hints_array_available() would always return false when re-activating a previously created cache. This means __load_mappings() always considered the hints invalid and never made use of the hints (these hints served to optimize). Another detremental side-effect of this oversight is the cache_check utility would fail with: "invalid hint width: 0" Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -363,7 +363,7 @@ static int __write_initial_superblock(struct dm_cache_metadata *cmd)
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disk_super->version = cpu_to_le32(cmd->version);
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memset(disk_super->policy_name, 0, sizeof(disk_super->policy_name));
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memset(disk_super->policy_version, 0, sizeof(disk_super->policy_version));
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disk_super->policy_hint_size = 0;
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disk_super->policy_hint_size = cpu_to_le32(0);
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__copy_sm_root(cmd, disk_super);
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@ -701,6 +701,7 @@ static int __commit_transaction(struct dm_cache_metadata *cmd,
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disk_super->policy_version[0] = cpu_to_le32(cmd->policy_version[0]);
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disk_super->policy_version[1] = cpu_to_le32(cmd->policy_version[1]);
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disk_super->policy_version[2] = cpu_to_le32(cmd->policy_version[2]);
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disk_super->policy_hint_size = cpu_to_le32(cmd->policy_hint_size);
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disk_super->read_hits = cpu_to_le32(cmd->stats.read_hits);
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disk_super->read_misses = cpu_to_le32(cmd->stats.read_misses);
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