diff options
Diffstat (limited to 'gsi_service.cpp')
| -rw-r--r-- | gsi_service.cpp | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/gsi_service.cpp b/gsi_service.cpp index cc6497a..66e01ee 100644 --- a/gsi_service.cpp +++ b/gsi_service.cpp @@ -510,20 +510,24 @@ binder::Status GsiService::getAvbPublicKey(AvbPublicKey* dst, int32_t* _aidl_ret binder::Status GsiService::suggestScratchSize(int64_t* _aidl_return) { ENFORCE_SYSTEM; - static constexpr int64_t kMinScratchSize = 512_MiB; - static constexpr int64_t kMaxScratchSize = 2_GiB; + static constexpr uint64_t kMinScratchSize = 512_MiB; + static constexpr uint64_t kMaxScratchSize = 2_GiB; - int64_t size = 0; + uint64_t size = 0; struct statvfs info; if (statvfs(install_dir_.c_str(), &info)) { PLOG(ERROR) << "Could not statvfs(" << install_dir_ << ")"; } else { - const int64_t available_space = static_cast<int64_t>(info.f_bavail) * info.f_frsize; - LOG(INFO) << "Available space of " << install_dir_ << ": " << available_space; - // Use up to half of free space. Don't exhaust the storage device with scratch partition. - size = available_space / 2; + // Keep the storage device at least 40% free, plus 1% for jitter. + constexpr int jitter = 1; + const uint64_t reserved_blocks = + static_cast<uint64_t>(info.f_blocks) * (kMinimumFreeSpaceThreshold + jitter) / 100; + if (info.f_bavail > reserved_blocks) { + size = (info.f_bavail - reserved_blocks) * info.f_frsize; + } } + // We can safely downcast the result here, since we clamped the result within int64_t range. *_aidl_return = std::clamp(size, kMinScratchSize, kMaxScratchSize); return binder::Status::ok(); } |