db_lmdb: test for mmap support at init time
It'll make it clearer when a DB init failure is due to being on a filesystem which does not support mmap
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@ -25,6 +25,13 @@
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef _WIN32
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#endif
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#include "db_lmdb.h"
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#include "db_lmdb.h"
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#include <boost/filesystem.hpp>
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#include <boost/filesystem.hpp>
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@ -1287,6 +1294,26 @@ BlockchainLMDB::BlockchainLMDB(bool batch_transactions): BlockchainDB()
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m_hardfork = nullptr;
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m_hardfork = nullptr;
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}
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}
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void BlockchainLMDB::check_mmap_support()
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{
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#ifndef _WIN32
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const boost::filesystem::path mmap_test_file = m_folder / boost::filesystem::unique_path();
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int mmap_test_fd = ::open(mmap_test_file.string().c_str(), O_RDWR | O_CREAT, 0600);
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if (mmap_test_fd < 0)
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throw0(DB_ERROR((std::string("Failed to check for mmap support: open failed: ") + strerror(errno)).c_str()));
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epee::misc_utils::auto_scope_leave_caller scope_exit_handler = epee::misc_utils::create_scope_leave_handler([mmap_test_fd, &mmap_test_file]() {
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::close(mmap_test_fd);
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boost::filesystem::remove(mmap_test_file.string());
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});
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if (write(mmap_test_fd, "mmaptest", 8) != 8)
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throw0(DB_ERROR((std::string("Failed to check for mmap support: write failed: ") + strerror(errno)).c_str()));
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void *mmap_res = mmap(NULL, 8, PROT_READ, MAP_SHARED, mmap_test_fd, 0);
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if (mmap_res == MAP_FAILED)
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throw0(DB_ERROR("This filesystem does not support mmap: use --data-dir to place the blockchain on a filesystem which does"));
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munmap(mmap_res, 8);
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#endif
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}
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void BlockchainLMDB::open(const std::string& filename, const int db_flags)
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void BlockchainLMDB::open(const std::string& filename, const int db_flags)
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{
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{
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int result;
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int result;
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@ -1328,6 +1355,8 @@ void BlockchainLMDB::open(const std::string& filename, const int db_flags)
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m_folder = filename;
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m_folder = filename;
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check_mmap_support();
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#ifdef __OpenBSD__
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#ifdef __OpenBSD__
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if ((mdb_flags & MDB_WRITEMAP) == 0) {
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if ((mdb_flags & MDB_WRITEMAP) == 0) {
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MCLOG_RED(el::Level::Info, "global", "Running on OpenBSD: forcing WRITEMAP");
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MCLOG_RED(el::Level::Info, "global", "Running on OpenBSD: forcing WRITEMAP");
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@ -356,6 +356,7 @@ public:
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static int compare_string(const MDB_val *a, const MDB_val *b);
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static int compare_string(const MDB_val *a, const MDB_val *b);
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private:
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private:
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void check_mmap_support();
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void do_resize(uint64_t size_increase=0);
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void do_resize(uint64_t size_increase=0);
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bool need_resize(uint64_t threshold_size=0) const;
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bool need_resize(uint64_t threshold_size=0) const;
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