/* * fs/f2fs/node.h * * Copyright (c) 2012 Samsung Electronics Co., Ltd. *             http://www.samsung.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. *//* start node id of a node block dedicated to the given node id */#define	START_NID(nid) ((nid / NAT_ENTRY_PER_BLOCK) * NAT_ENTRY_PER_BLOCK) /* node block offset on the NAT area dedicated to the given start node id */#define	NAT_BLOCK_OFFSET(start_nid) (start_nid / NAT_ENTRY_PER_BLOCK) /* # of pages to perform readahead before building free nids */#define FREE_NID_PAGES 4 /* maximum readahead size for node during getting data blocks */#define MAX_RA_NODE		128 /* control the memory footprint threshold (10MB per 1GB ram) */#define DEF_RAM_THRESHOLD	10 /* vector size for gang look-up from nat cache that consists of radix tree */#define NATVEC_SIZE	64#define SETVEC_SIZE	32 /* return value for read_node_page */#define LOCKED_PAGE	1 /* For flag in struct node_info */enum {	IS_CHECKPOINTED,	/* is it checkpointed before? */	HAS_FSYNCED_INODE,	/* is the inode fsynced before? */	HAS_LAST_FSYNC,		/* has the latest node fsync mark? */	IS_DIRTY,		/* this nat entry is dirty? */}; /* * For node information */struct node_info {	nid_t nid;		/* node id */	nid_t ino;		/* inode number of the node's owner */	block_t	blk_addr;	/* block address of the node */	unsigned char version;	/* version of the node */	unsigned char flag;	/* for node information bits */}; struct nat_entry {	struct list_head list;	/* for clean or dirty nat list */	struct node_info ni;	/* in-memory node information */}; #define nat_get_nid(nat)		(nat->ni.nid)#define nat_set_nid(nat, n)		(nat->ni.nid = n)#define nat_get_blkaddr(nat)		(nat->ni.blk_addr)#define nat_set_blkaddr(nat, b)		(nat->ni.blk_addr = b)#define nat_get_ino(nat)		(nat->ni.ino)#define nat_set_ino(nat, i)		(nat->ni.ino = i)#define nat_get_version(nat)		(nat->ni.version)#define nat_set_version(nat, v)		(nat->ni.version = v) #define inc_node_version(version)	(++version) static inline void copy_node_info(struct node_info *dst,						struct node_info *src){	dst->nid = src->nid;	dst->ino = src->ino;	dst->blk_addr = src->blk_addr;	dst->version = src->version;	/* should not copy flag here */} static inline void set_nat_flag(struct nat_entry *ne,				unsigned int type, bool set){	unsigned char mask = 0x01 << type;	if (set)		ne->ni.flag |= mask;	else		ne->ni.flag &= ~mask;} static inline bool get_nat_flag(struct nat_entry *ne, unsigned int type){	unsigned char mask = 0x01 << type;	return ne->ni.flag & mask;} static inline void nat_reset_flag(struct nat_entry *ne){	/* these states can be set only after checkpoint was done */	set_nat_flag(ne, IS_CHECKPOINTED, true);	set_nat_flag(ne, HAS_FSYNCED_INODE, false);	set_nat_flag(ne, HAS_LAST_FSYNC, true);} static inline void node_info_from_raw_nat(struct node_info *ni,						struct f2fs_nat_entry *raw_ne){	ni->ino = le32_to_cpu(raw_ne->ino);	ni->blk_addr = le32_to_cpu(raw_ne->block_addr);	ni->version = raw_ne->version;} static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,						struct node_info *ni){	raw_ne->ino = cpu_to_le32(ni->ino);	raw_ne->block_addr = cpu_to_le32(ni->blk_addr);	raw_ne->version = ni->version;} enum mem_type {	FREE_NIDS,	/* indicates the free nid list */	NAT_ENTRIES,	/* indicates the cached nat entry */	DIRTY_DENTS,	/* indicates dirty dentry pages */	INO_ENTRIES,	/* indicates inode entries */	EXTENT_CACHE,	/* indicates extent cache */	BASE_CHECK,	/* check kernel status */}; struct nat_entry_set {	struct list_head set_list;	/* link with other nat sets */	struct list_head entry_list;	/* link with dirty nat entries */	nid_t set;			/* set number*/	unsigned int entry_cnt;		/* the # of nat entries in set */}; /* * For free nid mangement */enum nid_state {	NID_NEW,	/* newly added to free nid list */	NID_ALLOC	/* it is allocated */}; struct free_nid {	struct list_head list;	/* for free node id list */	nid_t nid;		/* node id */	int state;		/* in use or not: NID_NEW or NID_ALLOC */}; static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid){	struct f2fs_nm_info *nm_i = NM_I(sbi);	struct free_nid *fnid; 	spin_lock(&nm_i->free_nid_list_lock);	if (nm_i->fcnt <= 0) {		spin_unlock(&nm_i->free_nid_list_lock);		return;	}	fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list);	*nid = fnid->nid;	spin_unlock(&nm_i->free_nid_list_lock);} /* * inline functions */static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr){	struct f2fs_nm_info *nm_i = NM_I(sbi);	memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size);} static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start){	struct f2fs_nm_info *nm_i = NM_I(sbi);	pgoff_t block_off;	pgoff_t block_addr;	int seg_off; 	block_off = NAT_BLOCK_OFFSET(start);	seg_off = block_off >> sbi->log_blocks_per_seg; 	block_addr = (pgoff_t)(nm_i->nat_blkaddr +		(seg_off << sbi->log_blocks_per_seg << 1) +		(block_off & ((1 << sbi->log_blocks_per_seg) - 1))); 	if (f2fs_test_bit(block_off, nm_i->nat_bitmap))		block_addr += sbi->blocks_per_seg; 	return block_addr;} static inline pgoff_t next_nat_addr(struct f2fs_sb_info *sbi,						pgoff_t block_addr){	struct f2fs_nm_info *nm_i = NM_I(sbi); 	block_addr -= nm_i->nat_blkaddr;	if ((block_addr >> sbi->log_blocks_per_seg) % 2)		block_addr -= sbi->blocks_per_seg;	else		block_addr += sbi->blocks_per_seg; 	return block_addr + nm_i->nat_blkaddr;} static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid){	unsigned int block_off = NAT_BLOCK_OFFSET(start_nid); 	f2fs_change_bit(block_off, nm_i->nat_bitmap);} static inline void fill_node_footer(struct page *page, nid_t nid,				nid_t ino, unsigned int ofs, bool reset){	struct f2fs_node *rn = F2FS_NODE(page);	unsigned int old_flag = 0; 	if (reset)		memset(rn, 0, sizeof(*rn));	else		old_flag = le32_to_cpu(rn->footer.flag); 	rn->footer.nid = cpu_to_le32(nid);	rn->footer.ino = cpu_to_le32(ino); 	/* should remain old flag bits such as COLD_BIT_SHIFT */	rn->footer.flag = cpu_to_le32((ofs << OFFSET_BIT_SHIFT) |					(old_flag & OFFSET_BIT_MASK));} static inline void copy_node_footer(struct page *dst, struct page *src){	struct f2fs_node *src_rn = F2FS_NODE(src);	struct f2fs_node *dst_rn = F2FS_NODE(dst);	memcpy(&dst_rn->footer, &src_rn->footer, sizeof(struct node_footer));} static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr){	struct f2fs_checkpoint *ckpt = F2FS_CKPT(F2FS_P_SB(page));	struct f2fs_node *rn = F2FS_NODE(page); 	rn->footer.cp_ver = ckpt->checkpoint_ver;	rn->footer.next_blkaddr = cpu_to_le32(blkaddr);} static inline nid_t ino_of_node(struct page *node_page){	struct f2fs_node *rn = F2FS_NODE(node_page);	return le32_to_cpu(rn->footer.ino);} static inline nid_t nid_of_node(struct page *node_page){	struct f2fs_node *rn = F2FS_NODE(node_page);	return le32_to_cpu(rn->footer.nid);} static inline unsigned int ofs_of_node(struct page *node_page){	struct f2fs_node *rn = F2FS_NODE(node_page);	unsigned flag = le32_to_cpu(rn->footer.flag);	return flag >> OFFSET_BIT_SHIFT;} static inline unsigned long long cpver_of_node(struct page *node_page){	struct f2fs_node *rn = F2FS_NODE(node_page);	return le64_to_cpu(rn->footer.cp_ver);} static inline block_t next_blkaddr_of_node(struct page *node_page){	struct f2fs_node *rn = F2FS_NODE(node_page);	return le32_to_cpu(rn->footer.next_blkaddr);} /* * f2fs assigns the following node offsets described as (num). * N = NIDS_PER_BLOCK * *  Inode block (0) *    |- direct node (1) *    |- direct node (2) *    |- indirect node (3) *    |            `- direct node (4 => 4 + N - 1) *    |- indirect node (4 + N) *    |            `- direct node (5 + N => 5 + 2N - 1) *    `- double indirect node (5 + 2N) *                 `- indirect node (6 + 2N) *                       `- direct node *                 ...... *                 `- indirect node ((6 + 2N) + x(N + 1)) *                       `- direct node *                 ...... *                 `- indirect node ((6 + 2N) + (N - 1)(N + 1)) *                       `- direct node */static inline bool IS_DNODE(struct page *node_page){	unsigned int ofs = ofs_of_node(node_page); 	if (f2fs_has_xattr_block(ofs))		return false; 	if (ofs == 3 || ofs == 4 + NIDS_PER_BLOCK ||			ofs == 5 + 2 * NIDS_PER_BLOCK)		return false;	if (ofs >= 6 + 2 * NIDS_PER_BLOCK) {		ofs -= 6 + 2 * NIDS_PER_BLOCK;		if (!((long int)ofs % (NIDS_PER_BLOCK + 1)))			return false;	}	return true;} static inline void set_nid(struct page *p, int off, nid_t nid, bool i){	struct f2fs_node *rn = F2FS_NODE(p); 	f2fs_wait_on_page_writeback(p, NODE); 	if (i)		rn->i.i_nid[off - NODE_DIR1_BLOCK] = cpu_to_le32(nid);	else		rn->in.nid[off] = cpu_to_le32(nid);	set_page_dirty(p);} static inline nid_t get_nid(struct page *p, int off, bool i){	struct f2fs_node *rn = F2FS_NODE(p); 	if (i)		return le32_to_cpu(rn->i.i_nid[off - NODE_DIR1_BLOCK]);	return le32_to_cpu(rn->in.nid[off]);} /* * Coldness identification: *  - Mark cold files in f2fs_inode_info *  - Mark cold node blocks in their node footer *  - Mark cold data pages in page cache */static inline int is_cold_data(struct page *page){	return PageChecked(page);} static inline void set_cold_data(struct page *page){	SetPageChecked(page);} static inline void clear_cold_data(struct page *page){	ClearPageChecked(page);} static inline int is_node(struct page *page, int type){	struct f2fs_node *rn = F2FS_NODE(page);	return le32_to_cpu(rn->footer.flag) & (1 << type);} #define is_cold_node(page)	is_node(page, COLD_BIT_SHIFT)#define is_fsync_dnode(page)	is_node(page, FSYNC_BIT_SHIFT)#define is_dent_dnode(page)	is_node(page, DENT_BIT_SHIFT) static inline void set_cold_node(struct inode *inode, struct page *page){	struct f2fs_node *rn = F2FS_NODE(page);	unsigned int flag = le32_to_cpu(rn->footer.flag); 	if (S_ISDIR(inode->i_mode))		flag &= ~(0x1 << COLD_BIT_SHIFT);	else		flag |= (0x1 << COLD_BIT_SHIFT);	rn->footer.flag = cpu_to_le32(flag);} static inline void set_mark(struct page *page, int mark, int type){	struct f2fs_node *rn = F2FS_NODE(page);	unsigned int flag = le32_to_cpu(rn->footer.flag);	if (mark)		flag |= (0x1 << type);	else		flag &= ~(0x1 << type);	rn->footer.flag = cpu_to_le32(flag);}#define set_dentry_mark(page, mark)	set_mark(page, mark, DENT_BIT_SHIFT)#define set_fsync_mark(page, mark)	set_mark(page, mark, FSYNC_BIT_SHIFT)