diff options
Diffstat (limited to 'llvm/lib/CAS/OnDiskCommon.h')
| -rw-r--r-- | llvm/lib/CAS/OnDiskCommon.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/llvm/lib/CAS/OnDiskCommon.h b/llvm/lib/CAS/OnDiskCommon.h index 8b79ffe..ac00662 100644 --- a/llvm/lib/CAS/OnDiskCommon.h +++ b/llvm/lib/CAS/OnDiskCommon.h @@ -12,9 +12,31 @@ #include "llvm/Support/Error.h" #include "llvm/Support/FileSystem.h" #include <chrono> +#include <optional> namespace llvm::cas::ondisk { +/// The version for all the ondisk database files. It needs to be bumped when +/// compatibility breaking changes are introduced. +constexpr StringLiteral CASFormatVersion = "v1"; + +/// Retrieves an overridden maximum mapping size for CAS files, if any, +/// speicified by LLVM_CAS_MAX_MAPPING_SIZE in the environment or set by +/// `setMaxMappingSize()`. If the value from environment is unreadable, returns +/// an error. +Expected<std::optional<uint64_t>> getOverriddenMaxMappingSize(); + +/// Set MaxMappingSize for ondisk CAS. This function is not thread-safe and +/// should be set before creaing any ondisk CAS and does not affect CAS already +/// created. Set value 0 to use default size. +void setMaxMappingSize(uint64_t Size); + +/// Whether to use a small file mapping for ondisk databases created in \p Path. +/// +/// For some file system that doesn't support sparse file, use a smaller file +/// mapping to avoid consuming too much disk space on creation. +bool useSmallMappingSize(const Twine &Path); + /// Thread-safe alternative to \c sys::fs::lockFile. This does not support all /// the platforms that \c sys::fs::lockFile does, so keep it in the CAS library /// for now. |