Implemented BPlusTree::Validate().
* Walks the complete B+tree and checks all nodes for validity (duplicate/fragment as well), ie. if no key is larger than those of its parent, and that the left/right links are valid. * This does not yet support repairing of broken trees, though.
This commit is contained in:
Axel Dörfler
parent
29a73026aa
commit
82e06fff68
@ -1,5 +1,5 @@
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/*
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* Copyright 2001-2010, Axel Dörfler, axeld@pinc-software.de.
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* Copyright 2001-2012, Axel Dörfler, axeld@pinc-software.de.
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* This file may be used under the terms of the MIT License.
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*
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* Roughly based on 'btlib' written by Marcus J. Ranum - it shares
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@ -36,8 +36,10 @@ public:
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void
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Check(const char* message)
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{
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if (fNode->CheckIntegrity(fSize) < B_OK)
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if (fNode->CheckIntegrity(fSize) != B_OK) {
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dprintf("%s: %s\n", fText, message);
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DEBUGGER(("NodeChecker integrity check failed!"));
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}
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}
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private:
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@ -48,6 +50,132 @@ private:
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#endif
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class BitmapArray {
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public:
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BitmapArray(size_t numBits);
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~BitmapArray();
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status_t InitCheck() const;
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bool IsSet(size_t index) const;
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void Set(size_t index, bool set);
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size_t CountSet() const { return fCountSet; }
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private:
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uint8* fBitmap;
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size_t fSize;
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size_t fCountSet;
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};
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struct TreeCheck {
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TreeCheck(BPlusTree* tree)
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:
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fLevelCount(0),
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fFreeCount(0),
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fNodeSize(tree->NodeSize()),
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fMaxLevels(tree->fHeader.MaxNumberOfLevels()),
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fFoundErrors(0),
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fVisited(tree->Stream()->Size() / tree->NodeSize()),
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fVisitedFragment(tree->Stream()->Size() / tree->NodeSize())
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{
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fPreviousOffsets = (off_t*)malloc(
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sizeof(off_t) * tree->fHeader.MaxNumberOfLevels());
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if (fPreviousOffsets != NULL) {
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for (size_t i = 0; i < fMaxLevels; i++)
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fPreviousOffsets[i] = BPLUSTREE_NULL;
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}
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}
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~TreeCheck()
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{
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free(fPreviousOffsets);
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}
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status_t InitCheck() const
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{
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if (fPreviousOffsets == NULL)
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return B_NO_MEMORY;
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status_t status = fVisited.InitCheck();
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if (status != B_OK)
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return status;
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return fVisitedFragment.InitCheck();
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}
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bool Visited(off_t offset) const
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{
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return fVisited.IsSet(offset / fNodeSize);
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}
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void SetVisited(off_t offset)
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{
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fVisited.Set(offset / fNodeSize, true);
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}
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size_t VisitedCount() const
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{
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return fVisited.CountSet();
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}
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bool VisitedFragment(off_t offset) const
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{
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return fVisitedFragment.IsSet(offset / fNodeSize);
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}
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void SetVisitedFragment(off_t offset)
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{
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fVisitedFragment.Set(offset / fNodeSize, true);
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}
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uint32 MaxLevels() const
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{
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return fLevelCount;
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}
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void SetLevel(uint32 level)
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{
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if (fLevelCount < level)
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fLevelCount = level;
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}
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off_t PreviousOffset(uint32 level)
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{
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return fPreviousOffsets[level];
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}
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void SetPreviousOffset(uint32 level, off_t offset)
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{
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fPreviousOffsets[level] = offset;
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}
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void FoundError()
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{
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fFoundErrors++;
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}
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bool ErrorsFound()
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{
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return fFoundErrors != 0;
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}
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private:
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uint32 fLevelCount;
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uint32 fFreeCount;
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uint32 fNodeSize;
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uint32 fMaxLevels;
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uint32 fFoundErrors;
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BitmapArray fVisited;
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BitmapArray fVisitedFragment;
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off_t* fPreviousOffsets;
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};
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// #pragma mark -
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// Node Caching for the BPlusTree class
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//
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// With write support, there is the need for a function that allocates new
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@ -474,10 +602,7 @@ BPlusTree::SetTo(Inode* stream)
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// we can't change the header since we don't have a transaction
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//fHeader.maximum_size = HOST_ENDIAN_TO_BFS_INT64(stream->Size());
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}
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if (fHeader.Magic() != BPLUSTREE_MAGIC
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|| (fHeader.RootNode() % fHeader.NodeSize()) != 0
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|| !fHeader.IsValidLink(fHeader.RootNode())
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|| !fHeader.IsValidLink(fHeader.FreeNode())) {
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if (!fHeader.IsValid()) {
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#ifdef DEBUG
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dump_bplustree_header(&fHeader);
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dump_block((const char*)&fHeader, 128);
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@ -522,6 +647,70 @@ BPlusTree::InitCheck()
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}
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status_t
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BPlusTree::Validate(bool repair, bool& _errorsFound)
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{
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TreeCheck check(this);
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if (check.InitCheck() != B_OK)
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return B_NO_MEMORY;
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check.SetVisited(0);
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// Walk the free nodes
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CachedNode cached(this);
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off_t freeOffset = fHeader.FreeNode();
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while (freeOffset > 0) {
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const bplustree_node* node = cached.SetTo(freeOffset, false);
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if (node == NULL)
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return B_IO_ERROR;
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if (check.Visited(freeOffset)) {
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dprintf("inode %" B_PRIdOFF ": free node at %" B_PRIdOFF
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" circular!\n", fStream->BlockNumber(), freeOffset);
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break;
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}
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check.SetVisited(freeOffset);
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if (node->OverflowLink() != BPLUSTREE_FREE) {
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dprintf("inode %" B_PRIdOFF ": free node at %" B_PRIdOFF
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" misses free mark!\n", fStream->BlockNumber(), freeOffset);
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}
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freeOffset = node->LeftLink();
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}
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// Iterate over the complete tree recursively
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const bplustree_node* root = cached.SetTo(fHeader.RootNode(), true);
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if (root == NULL)
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return B_IO_ERROR;
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status_t status = _ValidateChildren(check, 0, fHeader.RootNode(), NULL, 0,
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root);
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if (check.ErrorsFound())
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_errorsFound = true;
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if (status != B_OK)
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return status;
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if (check.MaxLevels() + 1 != fHeader.MaxNumberOfLevels()) {
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dprintf("inode %" B_PRIdOFF ": found %" B_PRIu32 " max levels, "
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"declared %" B_PRIu32 "!\n", fStream->BlockNumber(),
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check.MaxLevels(), fHeader.MaxNumberOfLevels());
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}
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if (check.VisitedCount() != fHeader.MaximumSize() / fNodeSize) {
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dprintf("inode %" B_PRIdOFF ": visited %" B_PRIuSIZE " from %" B_PRIdOFF
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" nodes.\n", fStream->BlockNumber(),
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check.VisitedCount(), fHeader.MaximumSize() / fNodeSize);
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}
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return B_OK;
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}
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int32
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BPlusTree::TypeCodeToKeyType(type_code code)
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{
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@ -834,9 +1023,8 @@ BPlusTree::_InsertDuplicate(Transaction& transaction, CachedNode& cached,
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if (bplustree_node::LinkType(oldValue)
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== BPLUSTREE_DUPLICATE_FRAGMENT) {
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bplustree_node* duplicate
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= cachedDuplicate.SetToWritable(transaction,
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bplustree_node::FragmentOffset(oldValue), false);
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bplustree_node* duplicate = cachedDuplicate.SetToWritable(
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transaction, bplustree_node::FragmentOffset(oldValue), false);
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if (duplicate == NULL)
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return B_IO_ERROR;
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@ -1937,6 +2125,211 @@ BPlusTree::Find(const uint8* key, uint16 keyLength, off_t* _value)
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}
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status_t
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BPlusTree::_ValidateChildren(TreeCheck& check, uint32 level, off_t offset,
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const uint8* largestKey, uint16 largestKeyLength,
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const bplustree_node* parent)
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{
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if (parent->CheckIntegrity(fNodeSize) != B_OK) {
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dprintf("inode %" B_PRIdOFF ": node %" B_PRIdOFF " integrity check "
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"failed!\n", fStream->BlockNumber(), offset);
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check.FoundError();
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return B_OK;
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}
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if (level >= fHeader.MaxNumberOfLevels()) {
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dprintf("inode %" B_PRIdOFF ": maximum level surpassed at %" B_PRIdOFF
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"!\n", fStream->BlockNumber(), offset);
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check.FoundError();
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return B_OK;
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}
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check.SetLevel(level);
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if (check.Visited(offset)) {
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dprintf("inode %" B_PRIdOFF ": node %" B_PRIdOFF " already visited!\n",
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fStream->BlockNumber(), offset);
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check.FoundError();
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return B_OK;
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}
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check.SetVisited(offset);
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uint32 count = parent->NumKeys();
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off_t* values = parent->Values();
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off_t lastOffset = check.PreviousOffset(level);
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CachedNode cached(this);
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for (uint32 i = 0; i < count; i++) {
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uint16 keyLength;
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uint8* key = parent->KeyAt(i, &keyLength);
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if (largestKey != NULL) {
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int result = compareKeys(fHeader.DataType(), key, keyLength,
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largestKey, largestKeyLength);
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if (result >= 0) {
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dprintf("inode %" B_PRIdOFF ": node %" B_PRIdOFF " key %"
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B_PRIu32 " larger than it should!\n",
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fStream->BlockNumber(), offset, i);
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check.FoundError();
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}
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}
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off_t childOffset = values[i];
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if (bplustree_node::IsDuplicate(childOffset)) {
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// Walk the duplicate nodes
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off_t duplicateOffset = bplustree_node::FragmentOffset(childOffset);
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off_t lastDuplicateOffset = BPLUSTREE_NULL;
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while (duplicateOffset != BPLUSTREE_NULL) {
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const bplustree_node* node
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= cached.SetTo(duplicateOffset, false);
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if (node == NULL)
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return B_IO_ERROR;
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bool isFragmentNode = bplustree_node::LinkType(childOffset)
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== BPLUSTREE_DUPLICATE_FRAGMENT;
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bool isKnownFragment = isFragmentNode
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&& check.VisitedFragment(duplicateOffset);
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if (!isKnownFragment && check.Visited(duplicateOffset)) {
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dprintf("inode %" B_PRIdOFF ": duplicate node at %"
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B_PRIdOFF " already visited!\n", fStream->BlockNumber(),
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duplicateOffset);
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check.FoundError();
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break;
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}
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// Fragment nodes may be visited more than once from different
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// places
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if (!check.Visited(duplicateOffset))
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check.SetVisited(duplicateOffset);
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if (!isKnownFragment && isFragmentNode)
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check.SetVisitedFragment(duplicateOffset);
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duplicate_array* array;
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uint32 maxSize;
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if (isFragmentNode) {
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array = node->FragmentAt(
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bplustree_node::FragmentIndex(childOffset));
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maxSize = NUM_FRAGMENT_VALUES;
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} else {
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array = node->DuplicateArray();
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maxSize = NUM_DUPLICATE_VALUES;
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}
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if (array->count == 0 || array->count > maxSize) {
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dprintf("inode %" B_PRIdOFF ": duplicate at %" B_PRIdOFF
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" has invalid array size %" B_PRIdOFF "!\n",
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fStream->BlockNumber(), duplicateOffset, array->count);
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check.FoundError();
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} else {
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// Simple check if the values in the array may be valid
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for (int32 j = 0; j < array->count; j++) {
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if (!fStream->GetVolume()->IsValidInodeBlock(
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array->values[j])) {
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dprintf("inode %" B_PRIdOFF ": duplicate at %"
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B_PRIdOFF " contains invalid block %" B_PRIdOFF
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" at %" B_PRId32 "!\n", fStream->BlockNumber(),
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duplicateOffset, array->values[j], j);
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check.FoundError();
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break;
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}
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}
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}
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// A fragment node is not linked (and does not have valid links)
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if (isFragmentNode)
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break;
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if (node->LeftLink() != lastDuplicateOffset) {
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dprintf("inode %" B_PRIdOFF ": duplicate at %" B_PRIdOFF
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" has wrong left link %" B_PRIdOFF ", expected %"
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B_PRIdOFF "!\n", fStream->BlockNumber(),
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duplicateOffset, node->LeftLink(), lastDuplicateOffset);
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check.FoundError();
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}
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lastDuplicateOffset = duplicateOffset;
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duplicateOffset = node->RightLink();
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}
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} else if (!parent->IsLeaf()) {
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// Test a regular child node recursively
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off_t nextOffset = parent->OverflowLink();
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if (i < count - 1)
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nextOffset = values[i + 1];
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if (i == 0 && lastOffset != BPLUSTREE_NULL) {
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// Test right link of the previous node
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const bplustree_node* previous = cached.SetTo(lastOffset, true);
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if (previous == NULL)
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return B_IO_ERROR;
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if (previous->RightLink() != childOffset) {
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dprintf("inode %" B_PRIdOFF ": node at %" B_PRIdOFF " has "
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"wrong right link %" B_PRIdOFF ", expected %" B_PRIdOFF
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"!\n", fStream->BlockNumber(), lastOffset,
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previous->RightLink(), childOffset);
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check.FoundError();
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}
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}
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status_t status = _ValidateChild(check, cached, level, childOffset,
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lastOffset, nextOffset, key, keyLength);
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if (status != B_OK)
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return status;
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} else if (!fStream->GetVolume()->IsValidInodeBlock(childOffset)) {
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dprintf("inode %" B_PRIdOFF ": node at %" B_PRIdOFF " contains "
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"invalid block %" B_PRIdOFF " at %" B_PRId32 "!\n",
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fStream->BlockNumber(), offset, childOffset, i);
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check.FoundError();
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}
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lastOffset = childOffset;
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}
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if (parent->OverflowLink() != BPLUSTREE_NULL) {
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off_t childOffset = parent->OverflowLink();
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status_t status = _ValidateChild(check, cached, level, childOffset,
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lastOffset, 0, NULL, 0);
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if (status != B_OK)
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return status;
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lastOffset = childOffset;
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}
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check.SetPreviousOffset(level, lastOffset);
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return B_OK;
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}
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status_t
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BPlusTree::_ValidateChild(TreeCheck& check, CachedNode& cached, uint32 level,
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off_t offset, off_t lastOffset, off_t nextOffset,
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const uint8* key, uint16 keyLength)
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{
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const bplustree_node* node = cached.SetTo(offset, true);
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if (node == NULL)
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return B_IO_ERROR;
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if (node->LeftLink() != lastOffset) {
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dprintf("inode %" B_PRIdOFF ": node at %" B_PRIdOFF " has "
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"wrong left link %" B_PRIdOFF ", expected %" B_PRIdOFF
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"!\n", fStream->BlockNumber(), offset, node->LeftLink(),
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lastOffset);
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check.FoundError();
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}
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if (nextOffset != 0 && node->RightLink() != nextOffset) {
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dprintf("inode %" B_PRIdOFF ": node at %" B_PRIdOFF " has "
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"wrong right link %" B_PRIdOFF ", expected %" B_PRIdOFF
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"!\n", fStream->BlockNumber(), offset, node->RightLink(),
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nextOffset);
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check.FoundError();
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}
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return _ValidateChildren(check, level + 1, offset, key, keyLength, node);
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}
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// #pragma mark -
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@ -2263,6 +2656,19 @@ TreeIterator::Dump()
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// #pragma mark -
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bool
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bplustree_header::IsValid() const
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{
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return Magic() == BPLUSTREE_MAGIC
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&& (RootNode() % NodeSize()) == 0
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&& IsValidLink(RootNode())
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&& IsValidLink(FreeNode());
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}
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// #pragma mark -
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void
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bplustree_node::Initialize()
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{
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@ -2337,7 +2743,6 @@ bplustree_node::FragmentsUsed(uint32 nodeSize) const
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}
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#ifdef DEBUG
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status_t
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bplustree_node::CheckIntegrity(uint32 nodeSize) const
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{
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@ -2350,19 +2755,69 @@ bplustree_node::CheckIntegrity(uint32 nodeSize) const
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if (key + length + sizeof(off_t) + sizeof(uint16)
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> (uint8*)this + nodeSize
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|| length > BPLUSTREE_MAX_KEY_LENGTH) {
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dprintf("node %p, key %d\n", this, (int)i);
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DEBUGGER(("invalid node: keys corrupted"));
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dprintf("invalid node %p, key %d: keys corrupted\n", this, (int)i);
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return B_BAD_DATA;
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}
|
||||
if (Values()[i] == -1) {
|
||||
dprintf("node %p, value %d: %lld\n", this, (int)i, Values()[i]);
|
||||
DEBUGGER(("invalid node: values corrupted"));
|
||||
dprintf("invalid node %p, value %d: %lld: values corrupted\n",
|
||||
this, (int)i, Values()[i]);
|
||||
return B_BAD_DATA;
|
||||
}
|
||||
}
|
||||
return B_OK;
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
// #pragma mark -
|
||||
|
||||
|
||||
BitmapArray::BitmapArray(size_t numBits)
|
||||
{
|
||||
fSize = (numBits + 7) / 8;
|
||||
fBitmap = (uint8*)calloc(fSize, 1);
|
||||
fCountSet = 0;
|
||||
}
|
||||
|
||||
|
||||
BitmapArray::~BitmapArray()
|
||||
{
|
||||
free(fBitmap);
|
||||
}
|
||||
|
||||
|
||||
status_t
|
||||
BitmapArray::InitCheck() const
|
||||
{
|
||||
return fBitmap != NULL ? B_OK : B_NO_MEMORY;
|
||||
}
|
||||
|
||||
|
||||
bool
|
||||
BitmapArray::IsSet(size_t index) const
|
||||
{
|
||||
uint32 byteIndex = index / 8;
|
||||
if (byteIndex >= fSize)
|
||||
return false;
|
||||
|
||||
return (fBitmap[byteIndex] & (1UL << (index & 0x7))) != 0;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
BitmapArray::Set(size_t index, bool set)
|
||||
{
|
||||
uint32 byteIndex = index / 8;
|
||||
if (byteIndex >= fSize)
|
||||
return;
|
||||
|
||||
if (set) {
|
||||
fBitmap[byteIndex] |= 1UL << (index & 0x7);
|
||||
fCountSet++;
|
||||
} else {
|
||||
fBitmap[byteIndex] &= ~(1UL << (index & 0x7));
|
||||
fCountSet--;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// #pragma mark -
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright 2001-2010, Axel Dörfler, axeld@pinc-software.de.
|
||||
* Copyright 2001-2012, Axel Dörfler, axeld@pinc-software.de.
|
||||
* This file may be used under the terms of the MIT License.
|
||||
*/
|
||||
#ifndef B_PLUS_TREE_H
|
||||
@ -39,6 +39,7 @@ struct bplustree_header {
|
||||
|
||||
inline bool CheckNode(bplustree_node* node) const;
|
||||
inline bool IsValidLink(off_t link) const;
|
||||
bool IsValid() const;
|
||||
} _PACKED;
|
||||
|
||||
#define BPLUSTREE_MAGIC 0x69f6c2e8
|
||||
@ -107,9 +108,7 @@ struct bplustree_node {
|
||||
static inline uint32 FragmentIndex(off_t link);
|
||||
static inline uint32 MaxFragments(uint32 nodeSize);
|
||||
|
||||
#ifdef DEBUG
|
||||
status_t CheckIntegrity(uint32 nodeSize) const;
|
||||
#endif
|
||||
} _PACKED;
|
||||
|
||||
//#define BPLUSTREE_NODE 0
|
||||
@ -137,6 +136,7 @@ class BPlusTree;
|
||||
class TreeIterator;
|
||||
class CachedNode;
|
||||
class Inode;
|
||||
struct TreeCheck;
|
||||
|
||||
// needed for searching (utilizing a stack)
|
||||
struct node_and_key {
|
||||
@ -211,7 +211,11 @@ public:
|
||||
status_t SetStream(Inode* stream);
|
||||
|
||||
status_t InitCheck();
|
||||
status_t Validate();
|
||||
|
||||
size_t NodeSize() const { return fNodeSize; }
|
||||
Inode* Stream() const { return fStream; }
|
||||
|
||||
status_t Validate(bool repair, bool& _errorsFound);
|
||||
|
||||
status_t Remove(Transaction& transaction,
|
||||
const uint8* key, uint16 keyLength,
|
||||
@ -292,9 +296,20 @@ private:
|
||||
void _AddIterator(TreeIterator* iterator);
|
||||
void _RemoveIterator(TreeIterator* iterator);
|
||||
|
||||
status_t _ValidateChildren(TreeCheck& check,
|
||||
uint32 level, off_t offset,
|
||||
const uint8* largestKey, uint16 keyLength,
|
||||
const bplustree_node* parent);
|
||||
status_t _ValidateChild(TreeCheck& check,
|
||||
CachedNode& cached, uint32 level,
|
||||
off_t offset, off_t lastOffset,
|
||||
off_t nextOffset, const uint8* key,
|
||||
uint16 keyLength);
|
||||
|
||||
private:
|
||||
friend class TreeIterator;
|
||||
friend class CachedNode;
|
||||
friend class TreeCheck;
|
||||
|
||||
Inode* fStream;
|
||||
bplustree_header fHeader;
|
||||
@ -309,9 +324,11 @@ private:
|
||||
|
||||
// #pragma mark - helper classes/functions
|
||||
|
||||
|
||||
extern int32 compareKeys(type_code type, const void* key1, int keyLength1,
|
||||
const void* key2, int keyLength2);
|
||||
|
||||
|
||||
class TreeIterator : public SinglyLinkedListLinkImpl<TreeIterator> {
|
||||
public:
|
||||
TreeIterator(BPlusTree* tree);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user