[linux.git] / include / linux / f2fs_fs.h

/**
 * include/linux/f2fs_fs.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.
 */
#ifndef _LINUX_F2FS_FS_H
#define _LINUX_F2FS_FS_H

#include <linux/pagemap.h>
#include <linux/types.h>

#define F2FS_SUPER_OFFSET		1024	/* byte-size offset */
#define F2FS_LOG_SECTOR_SIZE		9	/* 9 bits for 512 byte */
#define F2FS_LOG_SECTORS_PER_BLOCK	3	/* 4KB: F2FS_BLKSIZE */
#define F2FS_BLKSIZE			4096	/* support only 4KB block */
#define F2FS_MAX_EXTENSION		64	/* # of extension entries */

#define NULL_ADDR		((block_t)0)	/* used as block_t addresses */
#define NEW_ADDR		((block_t)-1)	/* used as block_t addresses */

#define F2FS_ROOT_INO(sbi)	(sbi->root_ino_num)
#define F2FS_NODE_INO(sbi)	(sbi->node_ino_num)
#define F2FS_META_INO(sbi)	(sbi->meta_ino_num)

/* This flag is used by node and meta inodes, and by recovery */
#define GFP_F2FS_ZERO	(GFP_NOFS | __GFP_ZERO)

/*
 * For further optimization on multi-head logs, on-disk layout supports maximum
 * 16 logs by default. The number, 16, is expected to cover all the cases
 * enoughly. The implementaion currently uses no more than 6 logs.
 * Half the logs are used for nodes, and the other half are used for data.
 */
#define MAX_ACTIVE_LOGS	16
#define MAX_ACTIVE_NODE_LOGS	8
#define MAX_ACTIVE_DATA_LOGS	8

/*
 * For superblock
 */
struct f2fs_super_block {
	__le32 magic;			/* Magic Number */
	__le16 major_ver;		/* Major Version */
	__le16 minor_ver;		/* Minor Version */
	__le32 log_sectorsize;		/* log2 sector size in bytes */
	__le32 log_sectors_per_block;	/* log2 # of sectors per block */
	__le32 log_blocksize;		/* log2 block size in bytes */
	__le32 log_blocks_per_seg;	/* log2 # of blocks per segment */
	__le32 segs_per_sec;		/* # of segments per section */
	__le32 secs_per_zone;		/* # of sections per zone */
	__le32 checksum_offset;		/* checksum offset inside super block */
	__le64 block_count;		/* total # of user blocks */
	__le32 section_count;		/* total # of sections */
	__le32 segment_count;		/* total # of segments */
	__le32 segment_count_ckpt;	/* # of segments for checkpoint */
	__le32 segment_count_sit;	/* # of segments for SIT */
	__le32 segment_count_nat;	/* # of segments for NAT */
	__le32 segment_count_ssa;	/* # of segments for SSA */
	__le32 segment_count_main;	/* # of segments for main area */
	__le32 segment0_blkaddr;	/* start block address of segment 0 */
	__le32 cp_blkaddr;		/* start block address of checkpoint */
	__le32 sit_blkaddr;		/* start block address of SIT */
	__le32 nat_blkaddr;		/* start block address of NAT */
	__le32 ssa_blkaddr;		/* start block address of SSA */
	__le32 main_blkaddr;		/* start block address of main area */
	__le32 root_ino;		/* root inode number */
	__le32 node_ino;		/* node inode number */
	__le32 meta_ino;		/* meta inode number */
	__u8 uuid[16];			/* 128-bit uuid for volume */
	__le16 volume_name[512];	/* volume name */
	__le32 extension_count;		/* # of extensions below */
	__u8 extension_list[F2FS_MAX_EXTENSION][8];	/* extension array */
} __packed;

/*
 * For checkpoint
 */
#define CP_ERROR_FLAG		0x00000008
#define CP_COMPACT_SUM_FLAG	0x00000004
#define CP_ORPHAN_PRESENT_FLAG	0x00000002
#define CP_UMOUNT_FLAG		0x00000001

struct f2fs_checkpoint {
	__le64 checkpoint_ver;		/* checkpoint block version number */
	__le64 user_block_count;	/* # of user blocks */
	__le64 valid_block_count;	/* # of valid blocks in main area */
	__le32 rsvd_segment_count;	/* # of reserved segments for gc */
	__le32 overprov_segment_count;	/* # of overprovision segments */
	__le32 free_segment_count;	/* # of free segments in main area */

	/* information of current node segments */
	__le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
	__le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
	/* information of current data segments */
	__le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
	__le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
	__le32 ckpt_flags;		/* Flags : umount and journal_present */
	__le32 cp_pack_total_block_count;	/* total # of one cp pack */
	__le32 cp_pack_start_sum;	/* start block number of data summary */
	__le32 valid_node_count;	/* Total number of valid nodes */
	__le32 valid_inode_count;	/* Total number of valid inodes */
	__le32 next_free_nid;		/* Next free node number */
	__le32 sit_ver_bitmap_bytesize;	/* Default value 64 */
	__le32 nat_ver_bitmap_bytesize; /* Default value 256 */
	__le32 checksum_offset;		/* checksum offset inside cp block */
	__le64 elapsed_time;		/* mounted time */
	/* allocation type of current segment */
	unsigned char alloc_type[MAX_ACTIVE_LOGS];

	/* SIT and NAT version bitmap */
	unsigned char sit_nat_version_bitmap[1];
} __packed;

/*
 * For orphan inode management
 */
#define F2FS_ORPHANS_PER_BLOCK	1020

struct f2fs_orphan_block {
	__le32 ino[F2FS_ORPHANS_PER_BLOCK];	/* inode numbers */
	__le32 reserved;	/* reserved */
	__le16 blk_addr;	/* block index in current CP */
	__le16 blk_count;	/* Number of orphan inode blocks in CP */
	__le32 entry_count;	/* Total number of orphan nodes in current CP */
	__le32 check_sum;	/* CRC32 for orphan inode block */
} __packed;

/*
 * For NODE structure
 */
struct f2fs_extent {
	__le32 fofs;		/* start file offset of the extent */
	__le32 blk_addr;	/* start block address of the extent */
	__le32 len;		/* lengh of the extent */
} __packed;

#define F2FS_NAME_LEN		255
#define ADDRS_PER_INODE         923	/* Address Pointers in an Inode */
#define ADDRS_PER_BLOCK         1018	/* Address Pointers in a Direct Block */
#define NIDS_PER_BLOCK          1018	/* Node IDs in an Indirect Block */

struct f2fs_inode {
	__le16 i_mode;			/* file mode */
	__u8 i_advise;			/* file hints */
	__u8 i_reserved;		/* reserved */
	__le32 i_uid;			/* user ID */
	__le32 i_gid;			/* group ID */
	__le32 i_links;			/* links count */
	__le64 i_size;			/* file size in bytes */
	__le64 i_blocks;		/* file size in blocks */
	__le64 i_atime;			/* access time */
	__le64 i_ctime;			/* change time */
	__le64 i_mtime;			/* modification time */
	__le32 i_atime_nsec;		/* access time in nano scale */
	__le32 i_ctime_nsec;		/* change time in nano scale */
	__le32 i_mtime_nsec;		/* modification time in nano scale */
	__le32 i_generation;		/* file version (for NFS) */
	__le32 i_current_depth;		/* only for directory depth */
	__le32 i_xattr_nid;		/* nid to save xattr */
	__le32 i_flags;			/* file attributes */
	__le32 i_pino;			/* parent inode number */
	__le32 i_namelen;		/* file name length */
	__u8 i_name[F2FS_NAME_LEN];	/* file name for SPOR */
	__u8 i_reserved2;		/* for backward compatibility */

	struct f2fs_extent i_ext;	/* caching a largest extent */

	__le32 i_addr[ADDRS_PER_INODE];	/* Pointers to data blocks */

	__le32 i_nid[5];		/* direct(2), indirect(2),
						double_indirect(1) node id */
} __packed;

struct direct_node {
	__le32 addr[ADDRS_PER_BLOCK];	/* array of data block address */
} __packed;

struct indirect_node {
	__le32 nid[NIDS_PER_BLOCK];	/* array of data block address */
} __packed;

enum {
	COLD_BIT_SHIFT = 0,
	FSYNC_BIT_SHIFT,
	DENT_BIT_SHIFT,
	OFFSET_BIT_SHIFT
};

struct node_footer {
	__le32 nid;		/* node id */
	__le32 ino;		/* inode nunmber */
	__le32 flag;		/* include cold/fsync/dentry marks and offset */
	__le64 cp_ver;		/* checkpoint version */
	__le32 next_blkaddr;	/* next node page block address */
} __packed;

struct f2fs_node {
	/* can be one of three types: inode, direct, and indirect types */
	union {
		struct f2fs_inode i;
		struct direct_node dn;
		struct indirect_node in;
	};
	struct node_footer footer;
} __packed;

/*
 * For NAT entries
 */
#define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))

struct f2fs_nat_entry {
	__u8 version;		/* latest version of cached nat entry */
	__le32 ino;		/* inode number */
	__le32 block_addr;	/* block address */
} __packed;

struct f2fs_nat_block {
	struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
} __packed;

/*
 * For SIT entries
 *
 * Each segment is 2MB in size by default so that a bitmap for validity of
 * there-in blocks should occupy 64 bytes, 512 bits.
 * Not allow to change this.
 */
#define SIT_VBLOCK_MAP_SIZE 64
#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))

/*
 * Note that f2fs_sit_entry->vblocks has the following bit-field information.
 * [15:10] : allocation type such as CURSEG_XXXX_TYPE
 * [9:0] : valid block count
 */
#define SIT_VBLOCKS_SHIFT	10
#define SIT_VBLOCKS_MASK	((1 << SIT_VBLOCKS_SHIFT) - 1)
#define GET_SIT_VBLOCKS(raw_sit)				\
	(le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
#define GET_SIT_TYPE(raw_sit)					\
	((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)	\
	 >> SIT_VBLOCKS_SHIFT)

struct f2fs_sit_entry {
	__le16 vblocks;				/* reference above */
	__u8 valid_map[SIT_VBLOCK_MAP_SIZE];	/* bitmap for valid blocks */
	__le64 mtime;				/* segment age for cleaning */
} __packed;

struct f2fs_sit_block {
	struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
} __packed;

/*
 * For segment summary
 *
 * One summary block contains exactly 512 summary entries, which represents
 * exactly 2MB segment by default. Not allow to change the basic units.
 *
 * NOTE: For initializing fields, you must use set_summary
 *
 * - If data page, nid represents dnode's nid
 * - If node page, nid represents the node page's nid.
 *
 * The ofs_in_node is used by only data page. It represents offset
 * from node's page's beginning to get a data block address.
 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
 */
#define ENTRIES_IN_SUM		512
#define	SUMMARY_SIZE		(7)	/* sizeof(struct summary) */
#define	SUM_FOOTER_SIZE		(5)	/* sizeof(struct summary_footer) */
#define SUM_ENTRY_SIZE		(SUMMARY_SIZE * ENTRIES_IN_SUM)

/* a summary entry for a 4KB-sized block in a segment */
struct f2fs_summary {
	__le32 nid;		/* parent node id */
	union {
		__u8 reserved[3];
		struct {
			__u8 version;		/* node version number */
			__le16 ofs_in_node;	/* block index in parent node */
		} __packed;
	};
} __packed;

/* summary block type, node or data, is stored to the summary_footer */
#define SUM_TYPE_NODE		(1)
#define SUM_TYPE_DATA		(0)

struct summary_footer {
	unsigned char entry_type;	/* SUM_TYPE_XXX */
	__u32 check_sum;		/* summary checksum */
} __packed;

#define SUM_JOURNAL_SIZE	(F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
				SUM_ENTRY_SIZE)
#define NAT_JOURNAL_ENTRIES	((SUM_JOURNAL_SIZE - 2) /\
				sizeof(struct nat_journal_entry))
#define NAT_JOURNAL_RESERVED	((SUM_JOURNAL_SIZE - 2) %\
				sizeof(struct nat_journal_entry))
#define SIT_JOURNAL_ENTRIES	((SUM_JOURNAL_SIZE - 2) /\
				sizeof(struct sit_journal_entry))
#define SIT_JOURNAL_RESERVED	((SUM_JOURNAL_SIZE - 2) %\
				sizeof(struct sit_journal_entry))
/*
 * frequently updated NAT/SIT entries can be stored in the spare area in
 * summary blocks
 */
enum {
	NAT_JOURNAL = 0,
	SIT_JOURNAL
};

struct nat_journal_entry {
	__le32 nid;
	struct f2fs_nat_entry ne;
} __packed;

struct nat_journal {
	struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
	__u8 reserved[NAT_JOURNAL_RESERVED];
} __packed;

struct sit_journal_entry {
	__le32 segno;
	struct f2fs_sit_entry se;
} __packed;

struct sit_journal {
	struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
	__u8 reserved[SIT_JOURNAL_RESERVED];
} __packed;

/* 4KB-sized summary block structure */
struct f2fs_summary_block {
	struct f2fs_summary entries[ENTRIES_IN_SUM];
	union {
		__le16 n_nats;
		__le16 n_sits;
	};
	/* spare area is used by NAT or SIT journals */
	union {
		struct nat_journal nat_j;
		struct sit_journal sit_j;
	};
	struct summary_footer footer;
} __packed;

/*
 * For directory operations
 */
#define F2FS_DOT_HASH		0
#define F2FS_DDOT_HASH		F2FS_DOT_HASH
#define F2FS_MAX_HASH		(~((0x3ULL) << 62))
#define F2FS_HASH_COL_BIT	((0x1ULL) << 63)

typedef __le32	f2fs_hash_t;

/* One directory entry slot covers 8bytes-long file name */
#define F2FS_SLOT_LEN		8
#define F2FS_SLOT_LEN_BITS	3

#define GET_DENTRY_SLOTS(x)	((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)

/* the number of dentry in a block */
#define NR_DENTRY_IN_BLOCK	214

/* MAX level for dir lookup */
#define MAX_DIR_HASH_DEPTH	63

#define SIZE_OF_DIR_ENTRY	11	/* by byte */
#define SIZE_OF_DENTRY_BITMAP	((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
					BITS_PER_BYTE)
#define SIZE_OF_RESERVED	(PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
				F2FS_SLOT_LEN) * \
				NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))

/* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
struct f2fs_dir_entry {
	__le32 hash_code;	/* hash code of file name */
	__le32 ino;		/* inode number */
	__le16 name_len;	/* lengh of file name */
	__u8 file_type;		/* file type */
} __packed;

/* 4KB-sized directory entry block */
struct f2fs_dentry_block {
	/* validity bitmap for directory entries in each block */
	__u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
	__u8 reserved[SIZE_OF_RESERVED];
	struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
	__u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
} __packed;

/* file types used in inode_info->flags */
enum {
	F2FS_FT_UNKNOWN,
	F2FS_FT_REG_FILE,
	F2FS_FT_DIR,
	F2FS_FT_CHRDEV,
	F2FS_FT_BLKDEV,
	F2FS_FT_FIFO,
	F2FS_FT_SOCK,
	F2FS_FT_SYMLINK,
	F2FS_FT_MAX
};

#endif  /* _LINUX_F2FS_FS_H */
Commit	Line	Data
dd31866b JK	1	/**
	2	* include/linux/f2fs_fs.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	#ifndef _LINUX_F2FS_FS_H
	12	#define _LINUX_F2FS_FS_H
	13
	14	#include <linux/pagemap.h>
	15	#include <linux/types.h>
	16
	17	#define F2FS_SUPER_OFFSET 1024 /* byte-size offset */
	18	#define F2FS_LOG_SECTOR_SIZE 9 /* 9 bits for 512 byte */
	19	#define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */
	20	#define F2FS_BLKSIZE 4096 /* support only 4KB block */
	21	#define F2FS_MAX_EXTENSION 64 /* # of extension entries */
	22
a9841c4d JK	23	#define NULL_ADDR ((block_t)0) /* used as block_t addresses */
a9841c4d JK	24	#define NEW_ADDR ((block_t)-1) /* used as block_t addresses */
dd31866b JK	25
	26	#define F2FS_ROOT_INO(sbi) (sbi->root_ino_num)
	27	#define F2FS_NODE_INO(sbi) (sbi->node_ino_num)
	28	#define F2FS_META_INO(sbi) (sbi->meta_ino_num)
	29
	30	/* This flag is used by node and meta inodes, and by recovery */
	31	#define GFP_F2FS_ZERO (GFP_NOFS \| __GFP_ZERO)
	32
	33	/*
	34	* For further optimization on multi-head logs, on-disk layout supports maximum
	35	* 16 logs by default. The number, 16, is expected to cover all the cases
	36	* enoughly. The implementaion currently uses no more than 6 logs.
	37	* Half the logs are used for nodes, and the other half are used for data.
	38	*/
	39	#define MAX_ACTIVE_LOGS 16
	40	#define MAX_ACTIVE_NODE_LOGS 8
	41	#define MAX_ACTIVE_DATA_LOGS 8
	42
	43	/*
	44	* For superblock
	45	*/
	46	struct f2fs_super_block {
	47	__le32 magic; /* Magic Number */
	48	__le16 major_ver; /* Major Version */
	49	__le16 minor_ver; /* Minor Version */
	50	__le32 log_sectorsize; /* log2 sector size in bytes */
	51	__le32 log_sectors_per_block; /* log2 # of sectors per block */
	52	__le32 log_blocksize; /* log2 block size in bytes */
	53	__le32 log_blocks_per_seg; /* log2 # of blocks per segment */
	54	__le32 segs_per_sec; /* # of segments per section */
	55	__le32 secs_per_zone; /* # of sections per zone */
	56	__le32 checksum_offset; /* checksum offset inside super block */
	57	__le64 block_count; /* total # of user blocks */
	58	__le32 section_count; /* total # of sections */
	59	__le32 segment_count; /* total # of segments */
	60	__le32 segment_count_ckpt; /* # of segments for checkpoint */
	61	__le32 segment_count_sit; /* # of segments for SIT */
	62	__le32 segment_count_nat; /* # of segments for NAT */
	63	__le32 segment_count_ssa; /* # of segments for SSA */
	64	__le32 segment_count_main; /* # of segments for main area */
	65	__le32 segment0_blkaddr; /* start block address of segment 0 */
	66	__le32 cp_blkaddr; /* start block address of checkpoint */
	67	__le32 sit_blkaddr; /* start block address of SIT */
	68	__le32 nat_blkaddr; /* start block address of NAT */
	69	__le32 ssa_blkaddr; /* start block address of SSA */
	70	__le32 main_blkaddr; /* start block address of main area */
	71	__le32 root_ino; /* root inode number */
	72	__le32 node_ino; /* node inode number */
	73	__le32 meta_ino; /* meta inode number */
	74	__u8 uuid[16]; /* 128-bit uuid for volume */
	75	__le16 volume_name[512]; /* volume name */
	76	__le32 extension_count; /* # of extensions below */
	77	__u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */
	78	} __packed;
	79
	80	/*
	81	* For checkpoint
	82	*/
	83	#define CP_ERROR_FLAG 0x00000008
	84	#define CP_COMPACT_SUM_FLAG 0x00000004
	85	#define CP_ORPHAN_PRESENT_FLAG 0x00000002
	86	#define CP_UMOUNT_FLAG 0x00000001
	87
	88	struct f2fs_checkpoint {
89	__le64 checkpoint_ver; /* checkpoint block version number */
90	__le64 user_block_count; /* # of user blocks */
91	__le64 valid_block_count; /* # of valid blocks in main area */
92	__le32 rsvd_segment_count; /* # of reserved segments for gc */
93	__le32 overprov_segment_count; /* # of overprovision segments */
94	__le32 free_segment_count; /* # of free segments in main area */
95
96	/* information of current node segments */
97	__le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
98	__le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
99	/* information of current data segments */
100	__le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
101	__le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
102	__le32 ckpt_flags; /* Flags : umount and journal_present */
103	__le32 cp_pack_total_block_count; /* total # of one cp pack */
104	__le32 cp_pack_start_sum; /* start block number of data summary */
105	__le32 valid_node_count; /* Total number of valid nodes */
106	__le32 valid_inode_count; /* Total number of valid inodes */
107	__le32 next_free_nid; /* Next free node number */
108	__le32 sit_ver_bitmap_bytesize; /* Default value 64 */
109	__le32 nat_ver_bitmap_bytesize; /* Default value 256 */
110	__le32 checksum_offset; /* checksum offset inside cp block */
111	__le64 elapsed_time; /* mounted time */
112	/* allocation type of current segment */
113	unsigned char alloc_type[MAX_ACTIVE_LOGS];
114
115	/* SIT and NAT version bitmap */
116	unsigned char sit_nat_version_bitmap[1];
117	} __packed;
118
119	/*
120	* For orphan inode management
121	*/
122	#define F2FS_ORPHANS_PER_BLOCK 1020
123
124	struct f2fs_orphan_block {
125	__le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */
126	__le32 reserved; /* reserved */
127	__le16 blk_addr; /* block index in current CP */
128	__le16 blk_count; /* Number of orphan inode blocks in CP */
129	__le32 entry_count; /* Total number of orphan nodes in current CP */
130	__le32 check_sum; /* CRC32 for orphan inode block */
131	} __packed;
132
133	/*
134	* For NODE structure
135	*/
136	struct f2fs_extent {
137	__le32 fofs; /* start file offset of the extent */
138	__le32 blk_addr; /* start block address of the extent */
139	__le32 len; /* lengh of the extent */
140	} __packed;
141
5a20d339	142	#define F2FS_NAME_LEN 255
dd31866b JK	143	#define ADDRS_PER_INODE 923 /* Address Pointers in an Inode */
	144	#define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */
	145	#define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */
	146
	147	struct f2fs_inode {
	148	__le16 i_mode; /* file mode */
	149	__u8 i_advise; /* file hints */
	150	__u8 i_reserved; /* reserved */
	151	__le32 i_uid; /* user ID */
	152	__le32 i_gid; /* group ID */
	153	__le32 i_links; /* links count */
	154	__le64 i_size; /* file size in bytes */
	155	__le64 i_blocks; /* file size in blocks */
	156	__le64 i_atime; /* access time */
	157	__le64 i_ctime; /* change time */
	158	__le64 i_mtime; /* modification time */
	159	__le32 i_atime_nsec; /* access time in nano scale */
	160	__le32 i_ctime_nsec; /* change time in nano scale */
	161	__le32 i_mtime_nsec; /* modification time in nano scale */
	162	__le32 i_generation; /* file version (for NFS) */
	163	__le32 i_current_depth; /* only for directory depth */
	164	__le32 i_xattr_nid; /* nid to save xattr */
	165	__le32 i_flags; /* file attributes */
	166	__le32 i_pino; /* parent inode number */
	167	__le32 i_namelen; /* file name length */
5a20d339 JK	168	__u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */
5a20d339 JK	169	__u8 i_reserved2; /* for backward compatibility */
dd31866b JK	170
	171	struct f2fs_extent i_ext; /* caching a largest extent */
	172
	173	__le32 i_addr[ADDRS_PER_INODE]; /* Pointers to data blocks */
	174
	175	__le32 i_nid[5]; /* direct(2), indirect(2),
	176	double_indirect(1) node id */
	177	} __packed;
	178
	179	struct direct_node {
	180	__le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */
	181	} __packed;
	182
	183	struct indirect_node {
	184	__le32 nid[NIDS_PER_BLOCK]; /* array of data block address */
	185	} __packed;
	186
	187	enum {
	188	COLD_BIT_SHIFT = 0,
	189	FSYNC_BIT_SHIFT,
	190	DENT_BIT_SHIFT,
	191	OFFSET_BIT_SHIFT
	192	};
	193
	194	struct node_footer {
	195	__le32 nid; /* node id */
	196	__le32 ino; /* inode nunmber */
	197	__le32 flag; /* include cold/fsync/dentry marks and offset */
	198	__le64 cp_ver; /* checkpoint version */
	199	__le32 next_blkaddr; /* next node page block address */
	200	} __packed;
	201
	202	struct f2fs_node {
	203	/* can be one of three types: inode, direct, and indirect types */
	204	union {
	205	struct f2fs_inode i;
	206	struct direct_node dn;
	207	struct indirect_node in;
	208	};
	209	struct node_footer footer;
	210	} __packed;
	211
	212	/*
	213	* For NAT entries
	214	*/
	215	#define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
	216
	217	struct f2fs_nat_entry {
	218	__u8 version; /* latest version of cached nat entry */
	219	__le32 ino; /* inode number */
	220	__le32 block_addr; /* block address */
	221	} __packed;
	222
	223	struct f2fs_nat_block {
	224	struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
	225	} __packed;
	226
	227	/*
	228	* For SIT entries
	229	*
	230	* Each segment is 2MB in size by default so that a bitmap for validity of
	231	* there-in blocks should occupy 64 bytes, 512 bits.
	232	* Not allow to change this.
	233	*/
234	#define SIT_VBLOCK_MAP_SIZE 64
235	#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
236
237	/*
238	* Note that f2fs_sit_entry->vblocks has the following bit-field information.
239	* [15:10] : allocation type such as CURSEG_XXXX_TYPE
240	* [9:0] : valid block count
241	*/
242	#define SIT_VBLOCKS_SHIFT 10
243	#define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1)
244	#define GET_SIT_VBLOCKS(raw_sit) \
245	(le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
246	#define GET_SIT_TYPE(raw_sit) \
247	((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \
248	>> SIT_VBLOCKS_SHIFT)
249
250	struct f2fs_sit_entry {
251	__le16 vblocks; /* reference above */
252	__u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */
253	__le64 mtime; /* segment age for cleaning */
254	} __packed;
255
256	struct f2fs_sit_block {
257	struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
258	} __packed;
259
260	/*
261	* For segment summary
262	*
263	* One summary block contains exactly 512 summary entries, which represents
264	* exactly 2MB segment by default. Not allow to change the basic units.
265	*
266	* NOTE: For initializing fields, you must use set_summary
267	*
268	* - If data page, nid represents dnode's nid
269	* - If node page, nid represents the node page's nid.
270	*
271	* The ofs_in_node is used by only data page. It represents offset
272	* from node's page's beginning to get a data block address.
273	* ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
274	*/
275	#define ENTRIES_IN_SUM 512
25ca923b JK	276	#define SUMMARY_SIZE (7) /* sizeof(struct summary) */
25ca923b JK	277	#define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */
dd31866b JK	278	#define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM)
	279
	280	/* a summary entry for a 4KB-sized block in a segment */
	281	struct f2fs_summary {
	282	__le32 nid; /* parent node id */
	283	union {
	284	__u8 reserved[3];
	285	struct {
	286	__u8 version; /* node version number */
	287	__le16 ofs_in_node; /* block index in parent node */
	288	} __packed;
	289	};
	290	} __packed;
	291
	292	/* summary block type, node or data, is stored to the summary_footer */
	293	#define SUM_TYPE_NODE (1)
	294	#define SUM_TYPE_DATA (0)
	295
	296	struct summary_footer {
	297	unsigned char entry_type; /* SUM_TYPE_XXX */
	298	__u32 check_sum; /* summary checksum */
	299	} __packed;
	300
25ca923b	301	#define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
dd31866b JK	302	SUM_ENTRY_SIZE)
	303	#define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
	304	sizeof(struct nat_journal_entry))
	305	#define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
	306	sizeof(struct nat_journal_entry))
	307	#define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
	308	sizeof(struct sit_journal_entry))
	309	#define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
	310	sizeof(struct sit_journal_entry))
	311	/*
	312	* frequently updated NAT/SIT entries can be stored in the spare area in
	313	* summary blocks
	314	*/
	315	enum {
	316	NAT_JOURNAL = 0,
	317	SIT_JOURNAL
	318	};
	319
	320	struct nat_journal_entry {
	321	__le32 nid;
	322	struct f2fs_nat_entry ne;
	323	} __packed;
	324
	325	struct nat_journal {
	326	struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
	327	__u8 reserved[NAT_JOURNAL_RESERVED];
	328	} __packed;
	329
	330	struct sit_journal_entry {
	331	__le32 segno;
	332	struct f2fs_sit_entry se;
	333	} __packed;
	334
	335	struct sit_journal {
	336	struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
	337	__u8 reserved[SIT_JOURNAL_RESERVED];
	338	} __packed;
	339
	340	/* 4KB-sized summary block structure */
	341	struct f2fs_summary_block {
	342	struct f2fs_summary entries[ENTRIES_IN_SUM];
	343	union {
	344	__le16 n_nats;
	345	__le16 n_sits;
	346	};
	347	/* spare area is used by NAT or SIT journals */
	348	union {
	349	struct nat_journal nat_j;
	350	struct sit_journal sit_j;
	351	};
	352	struct summary_footer footer;
	353	} __packed;
	354
	355	/*
	356	* For directory operations
	357	*/
	358	#define F2FS_DOT_HASH 0
	359	#define F2FS_DDOT_HASH F2FS_DOT_HASH
	360	#define F2FS_MAX_HASH (~((0x3ULL) << 62))
	361	#define F2FS_HASH_COL_BIT ((0x1ULL) << 63)
	362
	363	typedef __le32 f2fs_hash_t;
	364
	365	/* One directory entry slot covers 8bytes-long file name */
5a20d339 JK	366	#define F2FS_SLOT_LEN 8
5a20d339 JK	367	#define F2FS_SLOT_LEN_BITS 3
457d08ee	368
5a20d339	369	#define GET_DENTRY_SLOTS(x) ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
dd31866b JK	370
	371	/* the number of dentry in a block */
	372	#define NR_DENTRY_IN_BLOCK 214
	373
	374	/* MAX level for dir lookup */
	375	#define MAX_DIR_HASH_DEPTH 63
	376
	377	#define SIZE_OF_DIR_ENTRY 11 /* by byte */
	378	#define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
	379	BITS_PER_BYTE)
	380	#define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
5a20d339	381	F2FS_SLOT_LEN) * \
dd31866b JK	382	NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
dd31866b JK	383
5a20d339	384	/* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
dd31866b JK	385	struct f2fs_dir_entry {
	386	__le32 hash_code; /* hash code of file name */
	387	__le32 ino; /* inode number */
	388	__le16 name_len; /* lengh of file name */
	389	__u8 file_type; /* file type */
	390	} __packed;
	391
	392	/* 4KB-sized directory entry block */
	393	struct f2fs_dentry_block {
	394	/* validity bitmap for directory entries in each block */
	395	__u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
	396	__u8 reserved[SIZE_OF_RESERVED];
	397	struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
5a20d339	398	__u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
dd31866b JK	399	} __packed;
	400
	401	/* file types used in inode_info->flags */
	402	enum {
	403	F2FS_FT_UNKNOWN,
	404	F2FS_FT_REG_FILE,
	405	F2FS_FT_DIR,
	406	F2FS_FT_CHRDEV,
	407	F2FS_FT_BLKDEV,
	408	F2FS_FT_FIFO,
	409	F2FS_FT_SOCK,
	410	F2FS_FT_SYMLINK,
	411	F2FS_FT_MAX
	412	};
	413
	414	#endif /* _LINUX_F2FS_FS_H */