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Kernel: Allocate BlockBasedFilesystem caches upfront

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This eliminates the possibility of panicking due to encountering a page
fault while trying access the cache inside an interrupt handler.
This commit is contained in:
implicitfield
2025-05-17 00:39:38 +03:00
committed by Sönke Holz
parent 036f7d5438
commit 6836d5bc01
1 changed files with 2 additions and 2 deletions
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4
Kernel/FileSystem/BlockBasedFileSystem.cpp
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@@ -126,8 +126,8 @@ ErrorOr<void> BlockBasedFileSystem::initialize_while_locked()
VERIFY(m_lock.is_locked());
VERIFY(!is_initialized_while_locked());
VERIFY(logical_block_size() != 0);
auto cached_block_data = TRY(KBuffer::try_create_with_size("BlockBasedFS: Cache blocks"sv, DiskCache::EntryCount * logical_block_size()));
auto entries_data = TRY(KBuffer::try_create_with_size("BlockBasedFS: Cache entries"sv, DiskCache::EntryCount * sizeof(CacheEntry)));
auto cached_block_data = TRY(KBuffer::try_create_with_size("BlockBasedFS: Cache blocks"sv, DiskCache::EntryCount * logical_block_size(), Memory::Region::Access::ReadWrite, AllocationStrategy::AllocateNow));
auto entries_data = TRY(KBuffer::try_create_with_size("BlockBasedFS: Cache entries"sv, DiskCache::EntryCount * sizeof(CacheEntry), Memory::Region::Access::ReadWrite, AllocationStrategy::AllocateNow));
auto disk_cache = TRY(adopt_nonnull_own_or_enomem(new (nothrow) DiskCache(*this, move(cached_block_data), move(entries_data))));
m_cache.with_exclusive([&](auto& cache) {