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BTRFS: Implement Dereference() in Inode that remove the "name" and unlink it with inode.

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Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>
This commit is contained in:
hyche 2017-08-29 06:43:21 +07:00 committed by Augustin Cavalier
parent 8042a045b0
commit a9e85cb62f
2 changed files with 42 additions and 0 deletions
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40
src/add-ons/kernel/file_systems/btrfs/Inode.cpp
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@ -490,3 +490,43 @@ Inode::MakeReference(Transaction& transaction, BTree::Path* path,
return B_OK; return B_OK;
} }
// Remove the "name" and unlink it with inode.
status_t
Inode::Dereference(Transaction& transaction, BTree::Path* path, ino_t parentID,
const char* name)
{
BTree* tree = path->Tree();
// remove inode_ref item
btrfs_key key;
key.SetObjectID(fID);
key.SetType(BTRFS_KEY_TYPE_INODE_REF);
key.SetOffset(parentID);
btrfs_inode_ref* inodeRef;
status_t status = tree->RemoveEntries(transaction, path, key,
(void**)&inodeRef, 1);
if (status != B_OK)
return status;
// remove dir_item
uint32 hash = calculate_crc((uint32)~1, (uint8*)name, strlen(name));
key.SetObjectID(parentID);
key.SetType(BTRFS_KEY_TYPE_DIR_ITEM);
key.SetOffset(hash);
status = tree->RemoveEntries(transaction, path, key, NULL, 1);
if (status != B_OK)
return status;
// remove dir_index
uint64 index = inodeRef->Index();
free(inodeRef);
key.SetType(BTRFS_KEY_TYPE_DIR_INDEX);
key.SetOffset(index);
status = tree->RemoveEntries(transaction, path, key, NULL, 1);
if (status != B_OK)
return status;
return B_OK;
}

2
src/add-ons/kernel/file_systems/btrfs/Inode.h
View File

@ -76,6 +76,8 @@ public:
status_t Remove(Transaction& transaction, BTree::Path* path); status_t Remove(Transaction& transaction, BTree::Path* path);
status_t MakeReference(Transaction& transaction, BTree::Path* path, status_t MakeReference(Transaction& transaction, BTree::Path* path,
Inode* parent, const char* name, int32 mode); Inode* parent, const char* name, int32 mode);
status_t Dereference(Transaction& transaction, BTree::Path* path,
ino_t parentID, const char* name);
private: private:
Inode(Volume* volume); Inode(Volume* volume);
Inode(const Inode&); Inode(const Inode&);