Each metaslab's free space is tracked in space map object in the MOS, which is only updated in syncing context. More...

#include <metaslab_impl.h>

Collaboration diagram for metaslab:

Data Fields
kmutex_t	ms_lock
	metaslab lock
space_map_obj_t	ms_smo
	synced space map object
space_map_obj_t	ms_smo_syncing
	syncing space map object
space_map_t	ms_allocmap [TXG_SIZE]
	allocated this txg
space_map_t	ms_freemap [TXG_SIZE]
	freed this txg
space_map_t	ms_defermap [TXG_DEFER_SIZE]
	deferred frees
space_map_t	ms_map
	in-core free space map
int64_t	ms_deferspace
	sum of ms_defermap[] space
uint64_t	ms_weight
	weight vs.
metaslab_group_t *	ms_group
	metaslab group
avl_node_t	ms_group_node
	node in metaslab group tree
txg_node_t	ms_txg_node
	per-txg dirty metaslab links

Detailed Description

Each metaslab's free space is tracked in space map object in the MOS, which is only updated in syncing context.

Each time we sync a txg, we append the allocs and frees from that txg to the space map object. When the txg is done syncing, metaslab_sync_done() updates ms_smo to ms_smo_syncing. Everything in ms_smo is always safe to allocate.

Definition at line 72 of file metaslab_impl.h.