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[caching tools] handle version 1 metadata where policy_hint_width is zero

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This commit is contained in:
Joe Thornber
2013-10-14 12:40:13 +01:00
parent b177275816
commit 3b11749dcf
3 changed files with 19 additions and 6 deletions
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7
caching/superblock.cc
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@@ -55,7 +55,7 @@ namespace {
uint32_t const SUPERBLOCK_MAGIC = 06142003;
uint32_t const VERSION_BEGIN = 1;
uint32_t const VERSION_END = 2;
uint32_t const VERSION_END = 3;
}
//----------------------------------------------------------------
@@ -109,7 +109,7 @@ superblock::superblock()
: csum(0),
blocknr(SUPERBLOCK_LOCATION),
magic(SUPERBLOCK_MAGIC),
version(VERSION_BEGIN),
version(VERSION_END - 1u),
policy_hint_size(0),
mapping_root(0),
hint_root(0),
@@ -152,7 +152,7 @@ superblock_traits::unpack(superblock_disk const &disk, superblock &core)
for (unsigned i = 0; i < CACHE_POLICY_VERSION_SIZE; i++)
core.policy_version[i] = to_cpu<uint32_t>(disk.policy_version[i]);
core.policy_hint_size = to_cpu<uint32_t>(disk.policy_hint_size);
core.policy_hint_size = core.version == 1 ? 4 : to_cpu<uint32_t>(disk.policy_hint_size);
::memcpy(core.metadata_space_map_root,
disk.metadata_space_map_root,
@@ -194,7 +194,6 @@ superblock_traits::pack(superblock const &core, superblock_disk &disk)
for (unsigned i = 0; i < CACHE_POLICY_VERSION_SIZE; i++)
disk.policy_version[i] = to_disk<le32>(core.policy_version[i]);
disk.policy_hint_size = to_disk<le32>(core.policy_hint_size);
::memcpy(disk.metadata_space_map_root,