[deliverable/linux.git] / fs / f2fs / node.h

/*
 * 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

/* return value for read_node_page */
#define LOCKED_PAGE	1

/*
 * 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 */
};

struct nat_entry {
	struct list_head list;	/* for clean or dirty nat list */
	bool checkpointed;	/* whether it is checkpointed or not */
	bool fsync_done;	/* whether the latest node has fsync mark */
	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 __set_nat_cache_dirty(nm_i, ne)					\
	do {								\
		ne->checkpointed = false;				\
		list_move_tail(&ne->list, &nm_i->dirty_nat_entries);	\
	} while (0)
#define __clear_nat_cache_dirty(nm_i, ne)				\
	do {								\
		ne->checkpointed = true;				\
		list_move_tail(&ne->list, &nm_i->nat_entries);		\
	} while (0)
#define inc_node_version(version)	(++version)

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 */
};

struct nat_entry_set {
	struct list_head set_list;	/* link with all nat sets */
	struct list_head entry_list;	/* link with dirty nat entries */
	nid_t start_nid;		/* start nid of nats in set */
	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 int 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 -1;
	}
	fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list);
	*nid = fnid->nid;
	spin_unlock(&nm_i->free_nid_list_lock);
	return 0;
}

/*
 * 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);

	if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
		f2fs_clear_bit(block_off, nm_i->nat_bitmap);
	else
		f2fs_set_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);
	if (reset)
		memset(rn, 0, sizeof(*rn));
	rn->footer.nid = cpu_to_le32(nid);
	rn->footer.ino = cpu_to_le32(ino);
	rn->footer.flag = cpu_to_le32(ofs << OFFSET_BIT_SHIFT);
}

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_file(struct inode *inode, int type)
{
	return F2FS_I(inode)->i_advise & type;
}

static inline void set_file(struct inode *inode, int type)
{
	F2FS_I(inode)->i_advise |= type;
}

static inline void clear_file(struct inode *inode, int type)
{
	F2FS_I(inode)->i_advise &= ~type;
}

#define file_is_cold(inode)	is_file(inode, FADVISE_COLD_BIT)
#define file_wrong_pino(inode)	is_file(inode, FADVISE_LOST_PINO_BIT)
#define file_set_cold(inode)	set_file(inode, FADVISE_COLD_BIT)
#define file_lost_pino(inode)	set_file(inode, FADVISE_LOST_PINO_BIT)
#define file_clear_cold(inode)	clear_file(inode, FADVISE_COLD_BIT)
#define file_got_pino(inode)	clear_file(inode, FADVISE_LOST_PINO_BIT)

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)
Commit	Line	Data
0a8165d7	1	/*
39a53e0c JK	2	* fs/f2fs/node.h
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	/* start node id of a node block dedicated to the given node id */
	12	#define START_NID(nid) ((nid / NAT_ENTRY_PER_BLOCK) * NAT_ENTRY_PER_BLOCK)
	13
	14	/* node block offset on the NAT area dedicated to the given start node id */
	15	#define NAT_BLOCK_OFFSET(start_nid) (start_nid / NAT_ENTRY_PER_BLOCK)
	16
	17	/* # of pages to perform readahead before building free nids */
	18	#define FREE_NID_PAGES 4
	19
39a53e0c JK	20	/* maximum readahead size for node during getting data blocks */
	21	#define MAX_RA_NODE 128
	22
cdfc41c1 JK	23	/* control the memory footprint threshold (10MB per 1GB ram) */
	24	#define DEF_RAM_THRESHOLD 10
	25
39a53e0c JK	26	/* vector size for gang look-up from nat cache that consists of radix tree */
	27	#define NATVEC_SIZE 64
	28
56ae674c JK	29	/* return value for read_node_page */
	30	#define LOCKED_PAGE 1
	31
39a53e0c JK	32	/*
	33	* For node information
	34	*/
	35	struct node_info {
	36	nid_t nid; /* node id */
	37	nid_t ino; /* inode number of the node's owner */
	38	block_t blk_addr; /* block address of the node */
	39	unsigned char version; /* version of the node */
	40	};
	41
	42	struct nat_entry {
	43	struct list_head list; /* for clean or dirty nat list */
	44	bool checkpointed; /* whether it is checkpointed or not */
479f40c4	45	bool fsync_done; /* whether the latest node has fsync mark */
39a53e0c JK	46	struct node_info ni; /* in-memory node information */
	47	};
	48
	49	#define nat_get_nid(nat) (nat->ni.nid)
	50	#define nat_set_nid(nat, n) (nat->ni.nid = n)
	51	#define nat_get_blkaddr(nat) (nat->ni.blk_addr)
	52	#define nat_set_blkaddr(nat, b) (nat->ni.blk_addr = b)
	53	#define nat_get_ino(nat) (nat->ni.ino)
	54	#define nat_set_ino(nat, i) (nat->ni.ino = i)
	55	#define nat_get_version(nat) (nat->ni.version)
	56	#define nat_set_version(nat, v) (nat->ni.version = v)
	57
	58	#define __set_nat_cache_dirty(nm_i, ne) \
fffc2a00 JK	59	do { \
	60	ne->checkpointed = false; \
	61	list_move_tail(&ne->list, &nm_i->dirty_nat_entries); \
8b376249	62	} while (0)
39a53e0c	63	#define __clear_nat_cache_dirty(nm_i, ne) \
fffc2a00 JK	64	do { \
	65	ne->checkpointed = true; \
	66	list_move_tail(&ne->list, &nm_i->nat_entries); \
8b376249	67	} while (0)
39a53e0c JK	68	#define inc_node_version(version) (++version)
	69
	70	static inline void node_info_from_raw_nat(struct node_info *ni,
	71	struct f2fs_nat_entry *raw_ne)
	72	{
	73	ni->ino = le32_to_cpu(raw_ne->ino);
	74	ni->blk_addr = le32_to_cpu(raw_ne->block_addr);
	75	ni->version = raw_ne->version;
	76	}
	77
94dac22e CY	78	static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,
	79	struct node_info *ni)
	80	{
	81	raw_ne->ino = cpu_to_le32(ni->ino);
	82	raw_ne->block_addr = cpu_to_le32(ni->blk_addr);
	83	raw_ne->version = ni->version;
	84	}
	85
6fb03f3a	86	enum mem_type {
cdfc41c1	87	FREE_NIDS, /* indicates the free nid list */
6fb03f3a JK	88	NAT_ENTRIES, /* indicates the cached nat entry */
6fb03f3a JK	89	DIRTY_DENTS /* indicates dirty dentry pages */
cdfc41c1 JK	90	};
cdfc41c1 JK	91
aec71382 CY	92	struct nat_entry_set {
	93	struct list_head set_list; /* link with all nat sets */
	94	struct list_head entry_list; /* link with dirty nat entries */
	95	nid_t start_nid; /* start nid of nats in set */
	96	unsigned int entry_cnt; /* the # of nat entries in set */
	97	};
	98
39a53e0c JK	99	/*
	100	* For free nid mangement
	101	*/
	102	enum nid_state {
	103	NID_NEW, /* newly added to free nid list */
	104	NID_ALLOC /* it is allocated */
	105	};
	106
	107	struct free_nid {
	108	struct list_head list; /* for free node id list */
	109	nid_t nid; /* node id */
	110	int state; /* in use or not: NID_NEW or NID_ALLOC */
	111	};
	112
	113	static inline int next_free_nid(struct f2fs_sb_info sbi, nid_t nid)
	114	{
	115	struct f2fs_nm_info *nm_i = NM_I(sbi);
	116	struct free_nid *fnid;
	117
39a53e0c	118	spin_lock(&nm_i->free_nid_list_lock);
c6e48930 HY	119	if (nm_i->fcnt <= 0) {
	120	spin_unlock(&nm_i->free_nid_list_lock);
	121	return -1;
	122	}
39a53e0c JK	123	fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list);
	124	*nid = fnid->nid;
	125	spin_unlock(&nm_i->free_nid_list_lock);
	126	return 0;
	127	}
	128
	129	/*
	130	* inline functions
	131	*/
	132	static inline void get_nat_bitmap(struct f2fs_sb_info sbi, void addr)
	133	{
	134	struct f2fs_nm_info *nm_i = NM_I(sbi);
	135	memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size);
	136	}
	137
	138	static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start)
	139	{
	140	struct f2fs_nm_info *nm_i = NM_I(sbi);
	141	pgoff_t block_off;
	142	pgoff_t block_addr;
	143	int seg_off;
	144
	145	block_off = NAT_BLOCK_OFFSET(start);
	146	seg_off = block_off >> sbi->log_blocks_per_seg;
	147
	148	block_addr = (pgoff_t)(nm_i->nat_blkaddr +
	149	(seg_off << sbi->log_blocks_per_seg << 1) +
	150	(block_off & ((1 << sbi->log_blocks_per_seg) - 1)));
	151
	152	if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
	153	block_addr += sbi->blocks_per_seg;
	154
	155	return block_addr;
	156	}
	157
	158	static inline pgoff_t next_nat_addr(struct f2fs_sb_info *sbi,
	159	pgoff_t block_addr)
	160	{
	161	struct f2fs_nm_info *nm_i = NM_I(sbi);
	162
	163	block_addr -= nm_i->nat_blkaddr;
	164	if ((block_addr >> sbi->log_blocks_per_seg) % 2)
	165	block_addr -= sbi->blocks_per_seg;
	166	else
	167	block_addr += sbi->blocks_per_seg;
	168
	169	return block_addr + nm_i->nat_blkaddr;
	170	}
	171
	172	static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid)
	173	{
	174	unsigned int block_off = NAT_BLOCK_OFFSET(start_nid);
	175
	176	if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
	177	f2fs_clear_bit(block_off, nm_i->nat_bitmap);
	178	else
	179	f2fs_set_bit(block_off, nm_i->nat_bitmap);
	180	}
	181
	182	static inline void fill_node_footer(struct page *page, nid_t nid,
	183	nid_t ino, unsigned int ofs, bool reset)
	184	{
45590710	185	struct f2fs_node *rn = F2FS_NODE(page);
39a53e0c JK	186	if (reset)
	187	memset(rn, 0, sizeof(*rn));
	188	rn->footer.nid = cpu_to_le32(nid);
	189	rn->footer.ino = cpu_to_le32(ino);
	190	rn->footer.flag = cpu_to_le32(ofs << OFFSET_BIT_SHIFT);
	191	}
	192
	193	static inline void copy_node_footer(struct page dst, struct page src)
	194	{
45590710 GZ	195	struct f2fs_node *src_rn = F2FS_NODE(src);
45590710 GZ	196	struct f2fs_node *dst_rn = F2FS_NODE(dst);
39a53e0c JK	197	memcpy(&dst_rn->footer, &src_rn->footer, sizeof(struct node_footer));
	198	}
	199
	200	static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr)
	201	{
4081363f	202	struct f2fs_checkpoint *ckpt = F2FS_CKPT(F2FS_P_SB(page));
45590710 GZ	203	struct f2fs_node *rn = F2FS_NODE(page);
45590710 GZ	204
39a53e0c	205	rn->footer.cp_ver = ckpt->checkpoint_ver;
25ca923b	206	rn->footer.next_blkaddr = cpu_to_le32(blkaddr);
39a53e0c JK	207	}
	208
	209	static inline nid_t ino_of_node(struct page *node_page)
	210	{
45590710	211	struct f2fs_node *rn = F2FS_NODE(node_page);
39a53e0c JK	212	return le32_to_cpu(rn->footer.ino);
	213	}
	214
	215	static inline nid_t nid_of_node(struct page *node_page)
	216	{
45590710	217	struct f2fs_node *rn = F2FS_NODE(node_page);
39a53e0c JK	218	return le32_to_cpu(rn->footer.nid);
	219	}
	220
	221	static inline unsigned int ofs_of_node(struct page *node_page)
	222	{
45590710	223	struct f2fs_node *rn = F2FS_NODE(node_page);
39a53e0c JK	224	unsigned flag = le32_to_cpu(rn->footer.flag);
	225	return flag >> OFFSET_BIT_SHIFT;
	226	}
	227
	228	static inline unsigned long long cpver_of_node(struct page *node_page)
	229	{
45590710	230	struct f2fs_node *rn = F2FS_NODE(node_page);
39a53e0c JK	231	return le64_to_cpu(rn->footer.cp_ver);
	232	}
	233
	234	static inline block_t next_blkaddr_of_node(struct page *node_page)
	235	{
45590710	236	struct f2fs_node *rn = F2FS_NODE(node_page);
39a53e0c JK	237	return le32_to_cpu(rn->footer.next_blkaddr);
	238	}
	239
	240	/*
	241	* f2fs assigns the following node offsets described as (num).
	242	* N = NIDS_PER_BLOCK
	243	*
	244	* Inode block (0)
	245	* \|- direct node (1)
	246	* \|- direct node (2)
	247	* \|- indirect node (3)
	248	* \| `- direct node (4 => 4 + N - 1)
	249	* \|- indirect node (4 + N)
	250	* \| `- direct node (5 + N => 5 + 2N - 1)
	251	* `- double indirect node (5 + 2N)
	252	* `- indirect node (6 + 2N)
4f4124d0 CY	253	* `- direct node
	254	* ......
	255	* `- indirect node ((6 + 2N) + x(N + 1))
	256	* `- direct node
	257	* ......
	258	* `- indirect node ((6 + 2N) + (N - 1)(N + 1))
	259	* `- direct node
39a53e0c JK	260	*/
	261	static inline bool IS_DNODE(struct page *node_page)
	262	{
	263	unsigned int ofs = ofs_of_node(node_page);
dbe6a5ff	264
4bc8e9bc	265	if (f2fs_has_xattr_block(ofs))
dbe6a5ff JK	266	return false;
dbe6a5ff JK	267
39a53e0c JK	268	if (ofs == 3 \|\| ofs == 4 + NIDS_PER_BLOCK \|\|
	269	ofs == 5 + 2 * NIDS_PER_BLOCK)
	270	return false;
	271	if (ofs >= 6 + 2 * NIDS_PER_BLOCK) {
	272	ofs -= 6 + 2 * NIDS_PER_BLOCK;
3315101f	273	if (!((long int)ofs % (NIDS_PER_BLOCK + 1)))
39a53e0c JK	274	return false;
	275	}
	276	return true;
	277	}
	278
	279	static inline void set_nid(struct page *p, int off, nid_t nid, bool i)
	280	{
45590710	281	struct f2fs_node *rn = F2FS_NODE(p);
39a53e0c	282
54b591df	283	f2fs_wait_on_page_writeback(p, NODE);
39a53e0c JK	284
	285	if (i)
	286	rn->i.i_nid[off - NODE_DIR1_BLOCK] = cpu_to_le32(nid);
	287	else
	288	rn->in.nid[off] = cpu_to_le32(nid);
	289	set_page_dirty(p);
	290	}
	291
	292	static inline nid_t get_nid(struct page *p, int off, bool i)
	293	{
45590710 GZ	294	struct f2fs_node *rn = F2FS_NODE(p);
45590710 GZ	295
39a53e0c JK	296	if (i)
	297	return le32_to_cpu(rn->i.i_nid[off - NODE_DIR1_BLOCK]);
	298	return le32_to_cpu(rn->in.nid[off]);
	299	}
	300
	301	/*
	302	* Coldness identification:
	303	* - Mark cold files in f2fs_inode_info
	304	* - Mark cold node blocks in their node footer
	305	* - Mark cold data pages in page cache
	306	*/
a06a2416	307	static inline int is_file(struct inode *inode, int type)
39a53e0c	308	{
a06a2416	309	return F2FS_I(inode)->i_advise & type;
39a53e0c JK	310	}
39a53e0c JK	311
a06a2416	312	static inline void set_file(struct inode *inode, int type)
953a3e27	313	{
a06a2416	314	F2FS_I(inode)->i_advise \|= type;
953a3e27 JK	315	}
953a3e27 JK	316
354a3399 JK	317	static inline void clear_file(struct inode *inode, int type)
	318	{
	319	F2FS_I(inode)->i_advise &= ~type;
	320	}
	321
	322	#define file_is_cold(inode) is_file(inode, FADVISE_COLD_BIT)
	323	#define file_wrong_pino(inode) is_file(inode, FADVISE_LOST_PINO_BIT)
	324	#define file_set_cold(inode) set_file(inode, FADVISE_COLD_BIT)
	325	#define file_lost_pino(inode) set_file(inode, FADVISE_LOST_PINO_BIT)
	326	#define file_clear_cold(inode) clear_file(inode, FADVISE_COLD_BIT)
	327	#define file_got_pino(inode) clear_file(inode, FADVISE_LOST_PINO_BIT)
953a3e27	328
39a53e0c JK	329	static inline int is_cold_data(struct page *page)
	330	{
	331	return PageChecked(page);
	332	}
	333
	334	static inline void set_cold_data(struct page *page)
	335	{
	336	SetPageChecked(page);
	337	}
	338
	339	static inline void clear_cold_data(struct page *page)
	340	{
	341	ClearPageChecked(page);
	342	}
	343
a06a2416	344	static inline int is_node(struct page *page, int type)
39a53e0c	345	{
45590710	346	struct f2fs_node *rn = F2FS_NODE(page);
a06a2416	347	return le32_to_cpu(rn->footer.flag) & (1 << type);
39a53e0c JK	348	}
39a53e0c JK	349
a06a2416 NJ	350	#define is_cold_node(page) is_node(page, COLD_BIT_SHIFT)
	351	#define is_fsync_dnode(page) is_node(page, FSYNC_BIT_SHIFT)
	352	#define is_dent_dnode(page) is_node(page, DENT_BIT_SHIFT)
39a53e0c JK	353
	354	static inline void set_cold_node(struct inode inode, struct page page)
	355	{
45590710	356	struct f2fs_node *rn = F2FS_NODE(page);
39a53e0c JK	357	unsigned int flag = le32_to_cpu(rn->footer.flag);
	358
	359	if (S_ISDIR(inode->i_mode))
	360	flag &= ~(0x1 << COLD_BIT_SHIFT);
	361	else
	362	flag \|= (0x1 << COLD_BIT_SHIFT);
	363	rn->footer.flag = cpu_to_le32(flag);
	364	}
	365
a06a2416	366	static inline void set_mark(struct page *page, int mark, int type)
39a53e0c	367	{
45590710	368	struct f2fs_node *rn = F2FS_NODE(page);
39a53e0c JK	369	unsigned int flag = le32_to_cpu(rn->footer.flag);
39a53e0c JK	370	if (mark)
a06a2416	371	flag \|= (0x1 << type);
39a53e0c	372	else
a06a2416	373	flag &= ~(0x1 << type);
39a53e0c JK	374	rn->footer.flag = cpu_to_le32(flag);
39a53e0c JK	375	}
a06a2416 NJ	376	#define set_dentry_mark(page, mark) set_mark(page, mark, DENT_BIT_SHIFT)
a06a2416 NJ	377	#define set_fsync_mark(page, mark) set_mark(page, mark, FSYNC_BIT_SHIFT)