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Support header versioning in dm-bow

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Test: Make sure still boots, restores
Change-Id: I903f58cb22472dbbbbb4c27ed1d88ed1f7c7dc5d
This commit is contained in:
Paul Lawrence 2019-01-18 10:28:34 -08:00
parent 4f13a90a58
commit f507768981
1 changed files with 12 additions and 7 deletions
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19
Checkpoint.cpp
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@ -244,13 +244,14 @@ struct log_entry {
uint32_t checksum;
} __attribute__((packed));
struct log_sector {
struct log_sector_v1_0 {
uint32_t magic;
uint16_t header_version;
uint16_t header_size;
uint32_t block_size;
uint32_t count;
uint32_t sequence;
uint64_t sector0;
struct log_entry entries[];
} __attribute__((packed));
// MAGIC is BOW in ascii
@ -354,7 +355,7 @@ Status cp_restoreCheckpoint(const std::string& blockDevice) {
return Status::fromExceptionCode(errno, ("Cannot open " + blockDevice).c_str());
}
log_sector original_ls;
log_sector_v1_0 original_ls;
device.read(reinterpret_cast<char*>(&original_ls), sizeof(original_ls));
if (original_ls.magic != kMagic) {
LOG(ERROR) << "No magic";
@ -366,7 +367,7 @@ Status cp_restoreCheckpoint(const std::string& blockDevice) {
for (int sequence = original_ls.sequence; sequence >= 0 && status.isOk(); sequence--) {
auto buffer =
read(device, logs, validating, 0, original_ls.block_size, original_ls.block_size);
log_sector& ls = *reinterpret_cast<log_sector*>(&buffer[0]);
log_sector_v1_0 const& ls = *reinterpret_cast<log_sector_v1_0*>(&buffer[0]);
if (ls.magic != kMagic) {
LOG(ERROR) << "No magic!";
status = Status::fromExceptionCode(EINVAL, "No magic");
@ -390,9 +391,13 @@ Status cp_restoreCheckpoint(const std::string& blockDevice) {
LOG(INFO) << action << " from log sector " << ls.sequence;
for (log_entry* le = &ls.entries[ls.count - 1]; le >= ls.entries; --le) {
LOG(INFO) << action << " " << le->size << " bytes from sector " << le->dest
<< " to " << le->source << " with checksum " << std::hex << le->checksum;
for (log_entry* le =
reinterpret_cast<log_entry*>(&buffer[ls.header_size]) + ls.count - 1;
le >= reinterpret_cast<log_entry*>(&buffer[ls.header_size]); --le) {
// This is very noisy - limit to DEBUG only
LOG(DEBUG) << action << " " << le->size << " bytes from sector " << le->dest
<< " to " << le->source << " with checksum " << std::hex << le->checksum;
auto buffer = read(device, logs, validating, le->dest, le->size, ls.block_size);
uint32_t checksum = le->source / (ls.block_size / kSectorSize);
for (size_t i = 0; i < le->size; i += ls.block_size) {