btrfs: pre-allocate delayed dir index for non-overwrite rename

btrfs: pre-allocate delayed dir index for non-overwrite rename

For rename() without an overwrite target, pre-allocate the delayed
dir index before any btree modifications so that ENOMEM can be returned
before the source is unlinked from the old directory.

Add a prealloc parameter to btrfs_add_link() that allows callers to
pass pre-allocated delayed dir index resources. When provided,
btrfs_add_link() takes ownership: it either passes the prealloc to
btrfs_insert_dir_item() (which commits or frees it), or frees it
on early error. All existing callers pass NULL to preserve the current
behavior.

In btrfs_rename(), when new_inode is NULL (no overwrite), call
btrfs_prealloc_delayed_dir_index() before the first btree modification
and pass the result through to btrfs_add_link(). If the prealloc fails,
-ENOMEM is returned before any btree state has changed. The local
prealloc pointer is cleared once ownership passes to btrfs_add_link(),
so the out_fail path only frees one we still own.

For overwrite rename (new_inode != NULL), the transaction still aborts
on ENOMEM since earlier unlink operations have already made irreversible
btree modifications.

Assisted-by: LLM
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>