Remove some global 'using namespace's
This commit is contained in:
Joe Thornber
@@ -30,13 +30,9 @@
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#include <stdexcept>
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#include <sstream>
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// FIXME: remove these from a header!
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using namespace boost;
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using namespace persistent_data;
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using namespace std;
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//----------------------------------------------------------------
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// FIXME: give this namesace a name
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namespace {
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using namespace std;
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@@ -105,433 +101,435 @@ namespace {
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}
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};
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template <uint32_t BlockSize>
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block_io<BlockSize>::block_io(std::string const &path, block_address nr_blocks, mode m)
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: nr_blocks_(nr_blocks),
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mode_(m)
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{
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off_t file_size = nr_blocks * BlockSize;
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namespace persistent_data {
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template <uint32_t BlockSize>
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block_io<BlockSize>::block_io(std::string const &path, block_address nr_blocks, mode m)
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: nr_blocks_(nr_blocks),
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mode_(m)
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{
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off_t file_size = nr_blocks * BlockSize;
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switch (m) {
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case READ_ONLY:
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fd_ = open_block_file(path, file_size, false);
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break;
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switch (m) {
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case READ_ONLY:
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fd_ = open_block_file(path, file_size, false);
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break;
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case READ_WRITE:
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fd_ = open_block_file(path, file_size, true);
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break;
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case READ_WRITE:
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fd_ = open_block_file(path, file_size, true);
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break;
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case CREATE:
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fd_ = create_block_file(path, file_size);
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break;
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case CREATE:
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fd_ = create_block_file(path, file_size);
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break;
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default:
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throw runtime_error("unsupported mode");
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}
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}
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template <uint32_t BlockSize>
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block_io<BlockSize>::~block_io()
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{
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if (::close(fd_) < 0)
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syscall_failed("close");
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}
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template <uint32_t BlockSize>
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void
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block_io<BlockSize>::read_buffer(block_address location, buffer<BlockSize> &buffer) const
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{
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off_t r;
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r = ::lseek(fd_, BlockSize * location, SEEK_SET);
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if (r == (off_t) -1)
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throw std::runtime_error("lseek failed");
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ssize_t n;
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size_t remaining = BlockSize;
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unsigned char *buf = buffer.raw();
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do {
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n = ::read(fd_, buf, remaining);
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if (n > 0) {
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remaining -= n;
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buf += n;
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default:
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throw runtime_error("unsupported mode");
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}
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}
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template <uint32_t BlockSize>
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block_io<BlockSize>::~block_io()
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{
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if (::close(fd_) < 0)
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syscall_failed("close");
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}
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template <uint32_t BlockSize>
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void
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block_io<BlockSize>::read_buffer(block_address location, buffer<BlockSize> &buffer) const
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{
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off_t r;
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r = ::lseek(fd_, BlockSize * location, SEEK_SET);
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if (r == (off_t) -1)
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throw std::runtime_error("lseek failed");
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ssize_t n;
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size_t remaining = BlockSize;
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unsigned char *buf = buffer.raw();
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do {
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n = ::read(fd_, buf, remaining);
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if (n > 0) {
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remaining -= n;
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buf += n;
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}
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} while (remaining && ((n > 0) || (n == EINTR) || (n == EAGAIN)));
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if (n < 0)
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throw std::runtime_error("read failed");
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}
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template <uint32_t BlockSize>
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void
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block_io<BlockSize>::write_buffer(block_address location, buffer<BlockSize> const &buffer)
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{
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off_t r;
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r = ::lseek(fd_, BlockSize * location, SEEK_SET);
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if (r == (off_t) -1)
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throw std::runtime_error("lseek failed");
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ssize_t n;
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size_t remaining = BlockSize;
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unsigned char const *buf = buffer.raw();
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do {
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n = ::write(fd_, buf, remaining);
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if (n > 0) {
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remaining -= n;
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buf += n;
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}
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} while (remaining && ((n > 0) || (n == EINTR) || (n == EAGAIN)));
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if (n < 0) {
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std::ostringstream out;
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out << "write failed to block " << location
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<< ", block size = " << BlockSize
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<< ", remaining = " << remaining
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<< ", n = " << n
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<< ", errno = " << errno
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<< ", fd_ = " << fd_
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<< std::endl;
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throw std::runtime_error(out.str());
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}
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} while (remaining && ((n > 0) || (n == EINTR) || (n == EAGAIN)));
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if (n < 0)
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throw std::runtime_error("read failed");
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}
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template <uint32_t BlockSize>
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void
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block_io<BlockSize>::write_buffer(block_address location, buffer<BlockSize> const &buffer)
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{
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off_t r;
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r = ::lseek(fd_, BlockSize * location, SEEK_SET);
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if (r == (off_t) -1)
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throw std::runtime_error("lseek failed");
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ssize_t n;
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size_t remaining = BlockSize;
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unsigned char const *buf = buffer.raw();
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do {
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n = ::write(fd_, buf, remaining);
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if (n > 0) {
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remaining -= n;
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buf += n;
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}
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} while (remaining && ((n > 0) || (n == EINTR) || (n == EAGAIN)));
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if (n < 0) {
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std::ostringstream out;
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out << "write failed to block " << location
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<< ", block size = " << BlockSize
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<< ", remaining = " << remaining
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<< ", n = " << n
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<< ", errno = " << errno
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<< ", fd_ = " << fd_
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<< std::endl;
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throw std::runtime_error(out.str());
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}
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}
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//----------------------------------------------------------------
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template <uint32_t BlockSize>
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block_manager<BlockSize>::block::block(typename block_io<BlockSize>::ptr io,
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block_address location,
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block_type bt,
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typename validator::ptr v,
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bool zero)
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: io_(io),
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location_(location),
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data_(new buffer<BlockSize>()),
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validator_(v),
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bt_(bt),
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dirty_(false)
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{
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if (zero) {
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// FIXME: duplicate memset
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memset(data_->raw(), 0, BlockSize);
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dirty_ = true; // redundant?
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} else {
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io_->read_buffer(location_, *data_);
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validator_->check(*data_, location_);
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}
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}
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template <uint32_t BlockSize>
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block_manager<BlockSize>::block::~block()
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{
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flush();
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}
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template <uint32_t BlockSize>
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void
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block_manager<BlockSize>::block::flush()
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{
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if (dirty_) {
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validator_->prepare(*data_, location_);
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io_->write_buffer(location_, *data_);
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dirty_ = false;
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}
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}
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template <uint32_t BlockSize>
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void
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block_manager<BlockSize>::block::change_validator(typename block_manager<BlockSize>::validator::ptr v,
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bool check)
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{
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if (v.get() != validator_.get()) {
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if (dirty_)
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// It may have already happened, by calling
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// this we ensure we're consistent.
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validator_->prepare(*data_, location_);
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validator_ = v;
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if (check)
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template <uint32_t BlockSize>
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block_manager<BlockSize>::block::block(typename block_io<BlockSize>::ptr io,
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block_address location,
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block_type bt,
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typename validator::ptr v,
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bool zero)
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: io_(io),
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location_(location),
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data_(new buffer<BlockSize>()),
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validator_(v),
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bt_(bt),
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dirty_(false)
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{
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if (zero) {
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// FIXME: duplicate memset
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memset(data_->raw(), 0, BlockSize);
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dirty_ = true; // redundant?
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} else {
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io_->read_buffer(location_, *data_);
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validator_->check(*data_, location_);
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}
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}
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template <uint32_t BlockSize>
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block_manager<BlockSize>::block::~block()
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{
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flush();
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}
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template <uint32_t BlockSize>
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void
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block_manager<BlockSize>::block::flush()
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{
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if (dirty_) {
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validator_->prepare(*data_, location_);
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io_->write_buffer(location_, *data_);
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dirty_ = false;
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}
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}
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template <uint32_t BlockSize>
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void
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block_manager<BlockSize>::block::change_validator(typename block_manager<BlockSize>::validator::ptr v,
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bool check)
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{
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if (v.get() != validator_.get()) {
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if (dirty_)
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// It may have already happened, by calling
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// this we ensure we're consistent.
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validator_->prepare(*data_, location_);
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validator_ = v;
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if (check)
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validator_->check(*data_, location_);
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}
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}
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}
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//----------------------------------------------------------------
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template <uint32_t BlockSize>
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block_manager<BlockSize>::read_ref::read_ref(block_manager<BlockSize> const &bm,
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typename block::ptr b)
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: bm_(&bm),
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block_(b),
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holders_(new unsigned)
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{
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*holders_ = 1;
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}
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template <uint32_t BlockSize>
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block_manager<BlockSize>::read_ref::read_ref(read_ref const &rhs)
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: bm_(rhs.bm_),
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block_(rhs.block_),
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holders_(rhs.holders_)
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{
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(*holders_)++;
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}
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template <uint32_t BlockSize>
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block_manager<BlockSize>::read_ref::~read_ref()
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{
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if (!--(*holders_)) {
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if (block_->bt_ == BT_SUPERBLOCK) {
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bm_->flush();
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bm_->cache_.put(block_);
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bm_->flush();
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} else
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bm_->cache_.put(block_);
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bm_->tracker_.unlock(block_->location_);
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delete holders_;
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template <uint32_t BlockSize>
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block_manager<BlockSize>::read_ref::read_ref(block_manager<BlockSize> const &bm,
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typename block::ptr b)
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: bm_(&bm),
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block_(b),
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holders_(new unsigned)
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{
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*holders_ = 1;
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}
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}
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template <uint32_t BlockSize>
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typename block_manager<BlockSize>::read_ref const &
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block_manager<BlockSize>::read_ref::operator =(read_ref const &rhs)
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{
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if (this != &rhs) {
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block_ = rhs.block_;
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bm_ = rhs.bm_;
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holders_ = rhs.holders_;
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template <uint32_t BlockSize>
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block_manager<BlockSize>::read_ref::read_ref(read_ref const &rhs)
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: bm_(rhs.bm_),
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block_(rhs.block_),
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holders_(rhs.holders_)
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{
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(*holders_)++;
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}
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return *this;
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}
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template <uint32_t BlockSize>
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block_manager<BlockSize>::read_ref::~read_ref()
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{
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if (!--(*holders_)) {
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if (block_->bt_ == BT_SUPERBLOCK) {
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bm_->flush();
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bm_->cache_.put(block_);
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bm_->flush();
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} else
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bm_->cache_.put(block_);
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template <uint32_t BlockSize>
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block_address
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block_manager<BlockSize>::read_ref::get_location() const
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{
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return block_->location_;
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}
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bm_->tracker_.unlock(block_->location_);
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delete holders_;
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}
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}
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template <uint32_t BlockSize>
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buffer<BlockSize> const &
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block_manager<BlockSize>::read_ref::data() const
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{
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return *block_->data_;
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}
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template <uint32_t BlockSize>
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typename block_manager<BlockSize>::read_ref const &
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block_manager<BlockSize>::read_ref::operator =(read_ref const &rhs)
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{
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if (this != &rhs) {
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block_ = rhs.block_;
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bm_ = rhs.bm_;
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holders_ = rhs.holders_;
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(*holders_)++;
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}
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return *this;
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}
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template <uint32_t BlockSize>
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block_address
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block_manager<BlockSize>::read_ref::get_location() const
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{
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return block_->location_;
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}
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template <uint32_t BlockSize>
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buffer<BlockSize> const &
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block_manager<BlockSize>::read_ref::data() const
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{
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return *block_->data_;
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}
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//--------------------------------
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template <uint32_t BlockSize>
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block_manager<BlockSize>::write_ref::write_ref(block_manager<BlockSize> const &bm,
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typename block::ptr b)
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: read_ref(bm, b)
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{
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b->dirty_ = true;
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}
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template <uint32_t BlockSize>
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block_manager<BlockSize>::write_ref::write_ref(block_manager<BlockSize> const &bm,
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typename block::ptr b)
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: read_ref(bm, b)
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{
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b->dirty_ = true;
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}
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template <uint32_t BlockSize>
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buffer<BlockSize> &
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block_manager<BlockSize>::write_ref::data()
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{
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return *read_ref::block_->data_;
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}
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template <uint32_t BlockSize>
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buffer<BlockSize> &
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block_manager<BlockSize>::write_ref::data()
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{
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return *read_ref::block_->data_;
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}
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//----------------------------------------------------------------
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template <uint32_t BlockSize>
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block_manager<BlockSize>::block_manager(std::string const &path,
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block_address nr_blocks,
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unsigned max_concurrent_blocks,
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typename block_io<BlockSize>::mode mode)
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: io_(new block_io<BlockSize>(path, nr_blocks, mode)),
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cache_(max(1024u, max_concurrent_blocks)),
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tracker_(0, nr_blocks)
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{
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}
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template <uint32_t BlockSize>
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typename block_manager<BlockSize>::read_ref
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block_manager<BlockSize>::read_lock(block_address location,
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typename block_manager<BlockSize>::validator::ptr v) const
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{
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tracker_.read_lock(location);
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try {
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check(location);
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boost::optional<typename block::ptr> cached_block = cache_.get(location);
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if (cached_block) {
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typename block::ptr cb = *cached_block;
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cb->check_read_lockable();
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cb->change_validator(v);
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return read_ref(*this, *cached_block);
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}
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typename block::ptr b(new block(io_, location, BT_NORMAL, v));
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cache_.insert(b);
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return read_ref(*this, b);
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} catch (...) {
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tracker_.unlock(location);
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throw;
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}
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}
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template <uint32_t BlockSize>
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typename block_manager<BlockSize>::write_ref
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block_manager<BlockSize>::write_lock(block_address location,
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typename block_manager<BlockSize>::validator::ptr v)
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{
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tracker_.write_lock(location);
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try {
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check(location);
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||||
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||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
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||||
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if (cached_block) {
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||||
typename block::ptr cb = *cached_block;
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cb->check_write_lockable();
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||||
cb->change_validator(v);
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||||
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return write_ref(*this, *cached_block);
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||||
}
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||||
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typename block::ptr b(new block(io_, location, BT_NORMAL, v));
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||||
cache_.insert(b);
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||||
return write_ref(*this, b);
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||||
|
||||
} catch (...) {
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||||
tracker_.unlock(location);
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||||
throw;
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||||
template <uint32_t BlockSize>
|
||||
block_manager<BlockSize>::block_manager(std::string const &path,
|
||||
block_address nr_blocks,
|
||||
unsigned max_concurrent_blocks,
|
||||
typename block_io<BlockSize>::mode mode)
|
||||
: io_(new block_io<BlockSize>(path, nr_blocks, mode)),
|
||||
cache_(max(1024u, max_concurrent_blocks)),
|
||||
tracker_(0, nr_blocks)
|
||||
{
|
||||
}
|
||||
|
||||
}
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||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::read_ref
|
||||
block_manager<BlockSize>::read_lock(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v) const
|
||||
{
|
||||
tracker_.read_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::write_ref
|
||||
block_manager<BlockSize>::write_lock_zero(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v)
|
||||
{
|
||||
tracker_.write_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_read_lockable();
|
||||
cb->change_validator(v);
|
||||
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_write_lockable();
|
||||
cb->change_validator(v, false);
|
||||
memset((*cached_block)->data_->raw(), 0, BlockSize);
|
||||
return read_ref(*this, *cached_block);
|
||||
}
|
||||
|
||||
return write_ref(*this, *cached_block);
|
||||
typename block::ptr b(new block(io_, location, BT_NORMAL, v));
|
||||
cache_.insert(b);
|
||||
return read_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::write_ref
|
||||
block_manager<BlockSize>::write_lock(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v)
|
||||
{
|
||||
tracker_.write_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_write_lockable();
|
||||
cb->change_validator(v);
|
||||
|
||||
return write_ref(*this, *cached_block);
|
||||
}
|
||||
|
||||
typename block::ptr b(new block(io_, location, BT_NORMAL, v));
|
||||
cache_.insert(b);
|
||||
return write_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
|
||||
typename block::ptr b(new block(io_, location, BT_NORMAL, v, true));
|
||||
cache_.insert(b);
|
||||
return write_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::write_ref
|
||||
block_manager<BlockSize>::superblock(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v)
|
||||
{
|
||||
tracker_.superblock_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::write_ref
|
||||
block_manager<BlockSize>::write_lock_zero(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v)
|
||||
{
|
||||
tracker_.write_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_write_lockable();
|
||||
cb->change_validator(v, false);
|
||||
memset((*cached_block)->data_->raw(), 0, BlockSize);
|
||||
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_write_lockable();
|
||||
cb->bt_ = BT_SUPERBLOCK;
|
||||
cb->change_validator(v);
|
||||
return write_ref(*this, *cached_block);
|
||||
}
|
||||
|
||||
return write_ref(*this, *cached_block);
|
||||
typename block::ptr b(new block(io_, location, BT_NORMAL, v, true));
|
||||
cache_.insert(b);
|
||||
return write_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
|
||||
typename block::ptr b(new block(io_, location, BT_SUPERBLOCK, v));
|
||||
cache_.insert(b);
|
||||
return write_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::write_ref
|
||||
block_manager<BlockSize>::superblock_zero(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v)
|
||||
{
|
||||
tracker_.superblock_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::write_ref
|
||||
block_manager<BlockSize>::superblock(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v)
|
||||
{
|
||||
tracker_.superblock_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_write_lockable();
|
||||
cb->bt_ = BT_SUPERBLOCK;
|
||||
cb->change_validator(v, false);
|
||||
memset(cb->data_->raw(), 0, BlockSize); // FIXME: add a zero method to buffer
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_write_lockable();
|
||||
cb->bt_ = BT_SUPERBLOCK;
|
||||
cb->change_validator(v);
|
||||
|
||||
return write_ref(*this, *cached_block);
|
||||
return write_ref(*this, *cached_block);
|
||||
}
|
||||
|
||||
typename block::ptr b(new block(io_, location, BT_SUPERBLOCK, v));
|
||||
cache_.insert(b);
|
||||
return write_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
|
||||
typename block::ptr b(new block(io_, location, BT_SUPERBLOCK, v, true));
|
||||
cache_.insert(b);
|
||||
return write_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
void
|
||||
block_manager<BlockSize>::check(block_address b) const
|
||||
{
|
||||
if (b >= io_->get_nr_blocks())
|
||||
throw std::runtime_error("block address out of bounds");
|
||||
}
|
||||
template <uint32_t BlockSize>
|
||||
typename block_manager<BlockSize>::write_ref
|
||||
block_manager<BlockSize>::superblock_zero(block_address location,
|
||||
typename block_manager<BlockSize>::validator::ptr v)
|
||||
{
|
||||
tracker_.superblock_lock(location);
|
||||
try {
|
||||
check(location);
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
block_address
|
||||
block_manager<BlockSize>::get_nr_blocks() const
|
||||
{
|
||||
return io_->get_nr_blocks();
|
||||
}
|
||||
boost::optional<typename block::ptr> cached_block = cache_.get(location);
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
void
|
||||
block_manager<BlockSize>::write_block(typename block::ptr b) const
|
||||
{
|
||||
b->flush();
|
||||
}
|
||||
if (cached_block) {
|
||||
typename block::ptr cb = *cached_block;
|
||||
cb->check_write_lockable();
|
||||
cb->bt_ = BT_SUPERBLOCK;
|
||||
cb->change_validator(v, false);
|
||||
memset(cb->data_->raw(), 0, BlockSize); // FIXME: add a zero method to buffer
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
void
|
||||
block_manager<BlockSize>::flush() const
|
||||
{
|
||||
cache_.iterate_unheld(
|
||||
boost::bind(&block_manager<BlockSize>::write_block, this, _1));
|
||||
}
|
||||
return write_ref(*this, *cached_block);
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
bool
|
||||
block_manager<BlockSize>::is_locked(block_address b) const
|
||||
{
|
||||
return tracker_.is_locked(b);
|
||||
typename block::ptr b(new block(io_, location, BT_SUPERBLOCK, v, true));
|
||||
cache_.insert(b);
|
||||
return write_ref(*this, b);
|
||||
|
||||
} catch (...) {
|
||||
tracker_.unlock(location);
|
||||
throw;
|
||||
}
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
void
|
||||
block_manager<BlockSize>::check(block_address b) const
|
||||
{
|
||||
if (b >= io_->get_nr_blocks())
|
||||
throw std::runtime_error("block address out of bounds");
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
block_address
|
||||
block_manager<BlockSize>::get_nr_blocks() const
|
||||
{
|
||||
return io_->get_nr_blocks();
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
void
|
||||
block_manager<BlockSize>::write_block(typename block::ptr b) const
|
||||
{
|
||||
b->flush();
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
void
|
||||
block_manager<BlockSize>::flush() const
|
||||
{
|
||||
cache_.iterate_unheld(
|
||||
boost::bind(&block_manager<BlockSize>::write_block, this, _1));
|
||||
}
|
||||
|
||||
template <uint32_t BlockSize>
|
||||
bool
|
||||
block_manager<BlockSize>::is_locked(block_address b) const
|
||||
{
|
||||
return tracker_.is_locked(b);
|
||||
}
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------
|
||||
|
||||
Reference in New Issue
Block a user