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Make new FileStore remove old inode on write

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This commit is contained in:
Gary Talent 2018-03-11 08:55:05 -05:00
parent efe8bf3e46
commit 2ce09ff08a
1 changed files with 42 additions and 23 deletions
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65
deps/ox/src/ox/fs/filestore/filestoretemplate.hpp vendored
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@ -16,7 +16,7 @@ namespace ox::fs {
template<typename size_t>
struct __attribute__((packed)) FileStoreItem: public Item<size_t> {
ox::LittleEndian<size_t> id = 0;
ox::LittleEndian<size_t> fileType = 0;
ox::LittleEndian<uint8_t> fileType = 0;
ox::LittleEndian<size_t> links = 0;
ox::LittleEndian<size_t> left = 0;
ox::LittleEndian<size_t> right = 0;
@ -68,7 +68,7 @@ class FileStoreTemplate: public FileStore {
InodeId_t available();
private:
FileStoreData &fileStoreData();
FileStoreData *fileStoreData();
/**
* Places the given Item at the given ID. If it already exists, the
@ -96,7 +96,7 @@ class FileStoreTemplate: public FileStore {
*/
ItemPtr rootInode();
bool canWrite(InodeId_t id, size_t size);
bool canWrite(ItemPtr existing, size_t size);
};
@ -151,8 +151,15 @@ Error FileStoreTemplate<size_t>::decLinks(InodeId_t id) {
template<typename size_t>
Error FileStoreTemplate<size_t>::write(InodeId_t id, void *data, InodeId_t dataSize, uint8_t fileType) {
// TODO: delete the old node if it exists
if (canWrite(id, dataSize)) {
auto existing = find(id);
if (canWrite(existing, dataSize)) {
// delete the old node if it exists
if (existing.valid()) {
m_buffer->free(existing);
existing = nullptr;
}
// write the given data
auto dest = m_buffer->malloc(dataSize);
// if first malloc failed, compact and try again
dest = m_buffer->malloc(dataSize);
@ -165,7 +172,13 @@ Error FileStoreTemplate<size_t>::write(InodeId_t id, void *data, InodeId_t dataS
if (root.valid()) {
placeItem(root, dest);
} else {
fileStoreData().rootNode = root;
auto fsData = fileStoreData();
if (fsData) {
fsData->rootNode = dest;
} else {
m_buffer->free(dest);
return 1;
}
}
return 0;
}
@ -185,12 +198,21 @@ Error FileStoreTemplate<size_t>::read(InodeId_t id, InodeId_t readStart, InodeId
template<typename size_t>
typename FileStoreTemplate<size_t>::StatInfo FileStoreTemplate<size_t>::stat(InodeId_t id) {
auto inode = find(id);
if (inode.valid()) {
return {
.inodeId = id,
.links = inode->links,
.size = inode->size(),
.fileType = inode->fileType,
};
}
return {};
}
template<typename size_t>
InodeId_t FileStoreTemplate<size_t>::spaceNeeded(InodeId_t size) {
return 1;
return m_buffer->spaceNeeded(size);
}
template<typename size_t>
@ -204,8 +226,15 @@ InodeId_t FileStoreTemplate<size_t>::available() {
}
template<typename size_t>
typename FileStoreTemplate<size_t>::FileStoreData &FileStoreTemplate<size_t>::fileStoreData() {
return *reinterpret_cast<FileStoreData*>(m_buffer->firstItem()->data().get());
typename FileStoreTemplate<size_t>::FileStoreData *FileStoreTemplate<size_t>::fileStoreData() {
auto first = m_buffer->firstItem();
if (first.valid()) {
auto data = first->data();
if (data.valid()) {
return reinterpret_cast<FileStoreData*>(data.get());
}
}
return nullptr;
}
template<typename size_t>
@ -267,7 +296,7 @@ typename FileStoreTemplate<size_t>::ItemPtr FileStoreTemplate<size_t>::find(Item
template<typename size_t>
typename FileStoreTemplate<size_t>::ItemPtr FileStoreTemplate<size_t>::find(size_t id) {
auto root = m_buffer->ptr(fileStoreData().rootNode);
auto root = m_buffer->ptr(fileStoreData()->rootNode);
if (root.valid()) {
auto item = find(root, id);
return item;
@ -280,22 +309,12 @@ typename FileStoreTemplate<size_t>::ItemPtr FileStoreTemplate<size_t>::find(size
*/
template<typename size_t>
typename FileStoreTemplate<size_t>::ItemPtr FileStoreTemplate<size_t>::rootInode() {
return m_buffer->ptr(fileStoreData().rootNode);
return m_buffer->ptr(fileStoreData()->rootNode);
}
template<typename size_t>
bool FileStoreTemplate<size_t>::canWrite(InodeId_t id, size_t size) {
if (m_buffer->spaceNeeded(size) >= m_buffer->available()) {
return true;
} else {
auto existing = find(id);
if (existing.valid()) {
if (m_buffer->spaceNeeded(size) >= existing.size()) {
return true;
}
}
}
return false;
bool FileStoreTemplate<size_t>::canWrite(ItemPtr existing, size_t size) {
return existing.size() >= size || m_buffer->spaceNeeded(size) >= m_buffer->available();
}
using FileStore16 = FileStoreTemplate<uint16_t>;