cregit-Linux how code gets into the kernel

Release 4.7 include/linux/f2fs_fs.h

Directory: include/linux
/**
 * 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_MIN_LOG_SECTOR_SIZE	9	
/* 9 bits for 512 bytes */

#define F2FS_MAX_LOG_SECTOR_SIZE	12	
/* 12 bits for 4096 bytes */

#define F2FS_LOG_SECTORS_PER_BLOCK	3	
/* log number for sector/blk */

#define F2FS_BLKSIZE			4096	
/* support only 4KB block */

#define F2FS_BLKSIZE_BITS		12	
/* bits for F2FS_BLKSIZE */

#define F2FS_MAX_EXTENSION		64	
/* # of extension entries */

#define F2FS_BLK_ALIGN(x)	(((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)


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

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


#define F2FS_BYTES_TO_BLK(bytes)	((bytes) >> F2FS_BLKSIZE_BITS)

#define F2FS_BLK_TO_BYTES(blk)		((blk) << F2FS_BLKSIZE_BITS)

/* 0, 1(node nid), 2(meta nid) are reserved node id */

#define F2FS_RESERVED_NODE_NUM		3


#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)

#define GFP_F2FS_HIGH_ZERO	(GFP_NOFS | __GFP_ZERO | __GFP_HIGHMEM)

/*
 * 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


#define VERSION_LEN	256

#define MAX_VOLUME_NAME		512

/*
 * 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[MAX_VOLUME_NAME];	/* volume name */
	
__le32 extension_count;		/* # of extensions below */
	
__u8 extension_list[F2FS_MAX_EXTENSION][8];	/* extension array */
	
__le32 cp_payload;
	
__u8 version[VERSION_LEN];	/* the kernel version */
	
__u8 init_version[VERSION_LEN];	/* the initial kernel version */
	
__le32 feature;			/* defined features */
	
__u8 encryption_level;		/* versioning level for encryption */
	
__u8 encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
	
__u8 reserved[871];		/* valid reserved region */
} 
__packed;

/*
 * For checkpoint
 */

#define CP_FASTBOOT_FLAG	0x00000020

#define CP_FSCK_FLAG		0x00000010

#define CP_ERROR_FLAG		0x00000008

#define CP_COMPACT_SUM_FLAG	0x00000004

#define CP_ORPHAN_PRESENT_FLAG	0x00000002

#define CP_UMOUNT_FLAG		0x00000001


#define F2FS_CP_PACKS		2	
/* # of checkpoint packs */


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


#define GET_ORPHAN_BLOCKS(n)	((n + F2FS_ORPHANS_PER_BLOCK - 1) / \
                                        F2FS_ORPHANS_PER_BLOCK)


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;		/* start block address of the extent */
	
__le32 len;		/* lengh of the extent */
} 
__packed;


#define F2FS_NAME_LEN		255

#define F2FS_INLINE_XATTR_ADDRS	50	
/* 200 bytes for inline xattrs */

#define DEF_ADDRS_PER_INODE	923	
/* Address Pointers in an Inode */

#define DEF_NIDS_PER_INODE	5	
/* Node IDs in an Inode */

#define ADDRS_PER_INODE(inode)	addrs_per_inode(inode)

#define ADDRS_PER_BLOCK		1018	
/* Address Pointers in a Direct Block */

#define NIDS_PER_BLOCK		1018	
/* Node IDs in an Indirect Block */


#define ADDRS_PER_PAGE(page, inode)	\
	(IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK)


#define	NODE_DIR1_BLOCK		(DEF_ADDRS_PER_INODE + 1)

#define	NODE_DIR2_BLOCK		(DEF_ADDRS_PER_INODE + 2)

#define	NODE_IND1_BLOCK		(DEF_ADDRS_PER_INODE + 3)

#define	NODE_IND2_BLOCK		(DEF_ADDRS_PER_INODE + 4)

#define	NODE_DIND_BLOCK		(DEF_ADDRS_PER_INODE + 5)


#define F2FS_INLINE_XATTR	0x01	
/* file inline xattr flag */

#define F2FS_INLINE_DATA	0x02	
/* file inline data flag */

#define F2FS_INLINE_DENTRY	0x04	
/* file inline dentry flag */

#define F2FS_DATA_EXIST		0x08	
/* file inline data exist flag */

#define F2FS_INLINE_DOTS	0x10	
/* file having implicit dot dentries */


#define MAX_INLINE_DATA		(sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
                                                F2FS_INLINE_XATTR_ADDRS - 1))


struct f2fs_inode {
	
__le16 i_mode;			/* file mode */
	
__u8 i_advise;			/* file hints */
	
__u8 i_inline;			/* file inline flags */
	
__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_dir_level;		/* dentry_level for large dir */

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

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

	
__le32 i_nid[DEF_NIDS_PER_INODE];	/* 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
};


#define OFFSET_BIT_MASK		(0x07)	
/* (0x01 << OFFSET_BIT_SHIFT) - 1 */


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_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_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 */
	
__le32 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))

/* Reserved area should make size of f2fs_extra_info equals to
 * that of nat_journal and sit_journal.
 */

#define EXTRA_INFO_RESERVED	(SUM_JOURNAL_SIZE - 2 - 8)

/*
 * 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;


struct f2fs_extra_info {
	
__le64 kbytes_written;
	
__u8 reserved[EXTRA_INFO_RESERVED];
} 
__packed;


struct f2fs_journal {
	union {
		
__le16 n_nats;
		
__le16 n_sits;
	};
	/* spare area is used by NAT or SIT journals or extra info */
	union {
		
struct nat_journal nat_j;
		
struct sit_journal sit_j;
		
struct f2fs_extra_info info;
	};
} 
__packed;

/* 4KB-sized summary block structure */

struct f2fs_summary_block {
	
struct f2fs_summary entries[ENTRIES_IN_SUM];
	
struct f2fs_journal journal;
	
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)

/* MAX level for dir lookup */

#define MAX_DIR_HASH_DEPTH	63

/* MAX buckets in one level of dir */

#define MAX_DIR_BUCKETS		(1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))

/*
 * space utilization of regular dentry and inline dentry
 *              regular dentry                  inline dentry
 * bitmap       1 * 27 = 27                     1 * 23 = 23
 * reserved     1 * 3 = 3                       1 * 7 = 7
 * dentry       11 * 214 = 2354                 11 * 182 = 2002
 * filename     8 * 214 = 1712                  8 * 182 = 1456
 * total        4096                            3488
 *
 * Note: there are more reserved space in inline dentry than in regular
 * dentry, when converting inline dentry we should handle this carefully.
 */

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

#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;

/* for inline dir */

#define NR_INLINE_DENTRY	(MAX_INLINE_DATA * BITS_PER_BYTE / \
                                ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
                                BITS_PER_BYTE + 1))

#define INLINE_DENTRY_BITMAP_SIZE	((NR_INLINE_DENTRY + \
                                        BITS_PER_BYTE - 1) / BITS_PER_BYTE)

#define INLINE_RESERVED_SIZE	(MAX_INLINE_DATA - \
                                ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
                                NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE))

/* inline directory entry structure */

struct f2fs_inline_dentry {
	
__u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
	
__u8 reserved[INLINE_RESERVED_SIZE];
	
struct f2fs_dir_entry dentry[NR_INLINE_DENTRY];
	
__u8 filename[NR_INLINE_DENTRY][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
};


#define S_SHIFT 12

#endif  /* _LINUX_F2FS_FS_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
jaegeuk kimjaegeuk kim119786.55%2054.05%
chao yuchao yu1319.47%1129.73%
shuoran liushuoran liu251.81%12.70%
changman leechangman lee90.65%12.70%
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namjae jeonnamjae jeon90.65%12.70%
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Directory: include/linux
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