fs/f2fs/f2fs.h

895 struct f2fs_nm_info {  struct
896 	block_t nat_blkaddr;		/* base disk address of NAT */
897 	nid_t max_nid;			/* maximum possible node ids */
898 	nid_t available_nids;		/* # of available node ids */
899 	nid_t next_scan_nid;		/* the next nid to be scanned */
900 	unsigned int ram_thresh;	/* control the memory footprint */
901 	unsigned int ra_nid_pages;	/* # of nid pages to be readaheaded */
902 	unsigned int dirty_nats_ratio;	/* control dirty nats ratio threshold */
905 	struct radix_tree_root nat_root;/* root of the nat entry cache */
906 	struct radix_tree_root nat_set_root;/* root of the nat set cache */
907 	struct f2fs_rwsem nat_tree_lock;	/* protect nat entry tree */
908 	struct list_head nat_entries;	/* cached nat entry list (clean) */
909 	spinlock_t nat_list_lock;	/* protect clean nat entry list */
910 	unsigned int nat_cnt[MAX_NAT_STATE]; /* the # of cached nat entries */
911 	unsigned int nat_blocks;	/* # of nat blocks */
914 	struct radix_tree_root free_nid_root;/* root of the free_nid cache */
915 	struct list_head free_nid_list;		/* list for free nids excluding preallocated nids */
916 	unsigned int nid_cnt[MAX_NID_STATE];	/* the number of free node id */
917 	spinlock_t nid_list_lock;	/* protect nid lists ops */
918 	struct mutex build_lock;	/* lock for build free nids */
919 	unsigned char **free_nid_bitmap;
920 	unsigned char *nat_block_bitmap;
921 	unsigned short *free_nid_count;	/* free nid count of NAT block */
924 	char *nat_bitmap;		/* NAT bitmap pointer */
926 	unsigned int nat_bits_blocks;	/* # of nat bits blocks */
927 	unsigned char *nat_bits;	/* NAT bits blocks */
928 	unsigned char *full_nat_bits;	/* full NAT pages */
929 	unsigned char *empty_nat_bits;	/* empty NAT pages */
931 	char *nat_bitmap_mir;		/* NAT bitmap mirror */
933 	int bitmap_size;		/* bitmap size */