fs/f2fs/f2fs.h

920 struct f2fs_nm_info {  struct
921 	block_t nat_blkaddr;		/* base disk address of NAT */
922 	nid_t max_nid;			/* maximum possible node ids */
923 	nid_t available_nids;		/* # of available node ids */
924 	nid_t next_scan_nid;		/* the next nid to be scanned */
925 	nid_t max_rf_node_blocks;	/* max # of nodes for recovery */
926 	unsigned int ram_thresh;	/* control the memory footprint */
927 	unsigned int ra_nid_pages;	/* # of nid pages to be readaheaded */
928 	unsigned int dirty_nats_ratio;	/* control dirty nats ratio threshold */
931 	struct radix_tree_root nat_root;/* root of the nat entry cache */
932 	struct radix_tree_root nat_set_root;/* root of the nat set cache */
933 	struct f2fs_rwsem nat_tree_lock;	/* protect nat entry tree */
934 	struct list_head nat_entries;	/* cached nat entry list (clean) */
935 	spinlock_t nat_list_lock;	/* protect clean nat entry list */
936 	unsigned int nat_cnt[MAX_NAT_STATE]; /* the # of cached nat entries */
937 	unsigned int nat_blocks;	/* # of nat blocks */
940 	struct radix_tree_root free_nid_root;/* root of the free_nid cache */
941 	struct list_head free_nid_list;		/* list for free nids excluding preallocated nids */
942 	unsigned int nid_cnt[MAX_NID_STATE];	/* the number of free node id */
943 	spinlock_t nid_list_lock;	/* protect nid lists ops */
944 	struct mutex build_lock;	/* lock for build free nids */
945 	unsigned char **free_nid_bitmap;
946 	unsigned char *nat_block_bitmap;
947 	unsigned short *free_nid_count;	/* free nid count of NAT block */
950 	char *nat_bitmap;		/* NAT bitmap pointer */
952 	unsigned int nat_bits_blocks;	/* # of nat bits blocks */
953 	unsigned char *nat_bits;	/* NAT bits blocks */
954 	unsigned char *full_nat_bits;	/* full NAT pages */
955 	unsigned char *empty_nat_bits;	/* empty NAT pages */
957 	char *nat_bitmap_mir;		/* NAT bitmap mirror */
959 	int bitmap_size;		/* bitmap size */