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BTRFS: Implement btrfs_remove_dir that can remove directories in most case.

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We need to handle a case when node size is small reasonably it can be merged with another node or push data from other node to this node.

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>
This commit is contained in:
hyche 2017-08-29 06:55:13 +07:00 committed by Augustin Cavalier
parent 166917c9cd
commit 4896a3735e
1 changed files with 43 additions and 1 deletions
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44
src/add-ons/kernel/file_systems/btrfs/kernel_interface.cpp
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@ -528,6 +528,48 @@ btrfs_create_dir(fs_volume* _volume, fs_vnode* _directory, const char* name,
}
static status_t
btrfs_remove_dir(fs_volume* _volume, fs_vnode* _directory, const char* name)
{
Volume* volume = (Volume*)_volume->private_volume;
Inode* directory = (Inode*)_directory->private_node;
Transaction transaction(volume);
BTree::Path path(volume->FSTree());
ino_t id;
status_t status = DirectoryIterator(directory).Lookup(name, strlen(name),
&id);
if (status != B_OK)
return status;
Inode inode(volume, id);
status = inode.InitCheck();
if (status != B_OK)
return status;
status = inode.Remove(transaction, &path);
if (status != B_OK)
return status;
status = inode.Dereference(transaction, &path, directory->ID(), name);
if (status != B_OK)
return status;
entry_cache_remove(volume->ID(), directory->ID(), name);
entry_cache_remove(volume->ID(), id, "..");
status = transaction.Done();
if (status == B_OK)
notify_entry_removed(volume->ID(), directory->ID(), name, id);
else {
entry_cache_add(volume->ID(), directory->ID(), name, id);
entry_cache_add(volume->ID(), id, "..", id);
}
return status;
}
static status_t
btrfs_open_dir(fs_volume* /*_volume*/, fs_vnode* _node, void** _cookie)
{
@ -861,7 +903,7 @@ fs_vnode_ops gBtrfsVnodeOps = {
/* directory operations */
&btrfs_create_dir,
NULL, // fs_remove_dir,
&btrfs_remove_dir,
&btrfs_open_dir,
&btrfs_close_dir,
&btrfs_free_dir_cookie,