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- // SPDX-License-Identifier: GPL-2.0
- /**
- * include/linux/f2fs_fs.h
- *
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- * http://www.samsung.com/
- */
- #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 PAGE_SHIFT /* Max is Block Size */
- #define F2FS_LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) /* log number for sector/blk */
- #define F2FS_BLKSIZE PAGE_SIZE /* support only block == page */
- #define F2FS_BLKSIZE_BITS PAGE_SHIFT /* bits for F2FS_BLKSIZE */
- #define F2FS_MAX_EXTENSION 64 /* # of extension entries */
- #define F2FS_EXTENSION_LEN 8 /* max size of extension */
- #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 COMPRESS_ADDR ((block_t)-2) /* used as compressed data flag */
- #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)
- #define F2FS_COMPRESS_INO(sbi) (NM_I(sbi)->max_nid)
- #define F2FS_MAX_QUOTAS 3
- #define F2FS_ENC_UTF8_12_1 1
- #define F2FS_IO_SIZE(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */
- #define F2FS_IO_SIZE_KB(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits + 2) /* KB */
- #define F2FS_IO_SIZE_BITS(sbi) (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */
- #define F2FS_IO_SIZE_MASK(sbi) (F2FS_IO_SIZE(sbi) - 1)
- #define F2FS_IO_ALIGNED(sbi) (F2FS_IO_SIZE(sbi) > 1)
- /* 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
- #define VERSION_LEN 256
- #define MAX_VOLUME_NAME 512
- #define MAX_PATH_LEN 64
- #define MAX_DEVICES 8
- /*
- * For superblock
- */
- struct f2fs_device {
- __u8 path[MAX_PATH_LEN];
- __le32 total_segments;
- } __packed;
- /* reason of stop_checkpoint */
- enum stop_cp_reason {
- STOP_CP_REASON_SHUTDOWN,
- STOP_CP_REASON_FAULT_INJECT,
- STOP_CP_REASON_META_PAGE,
- STOP_CP_REASON_WRITE_FAIL,
- STOP_CP_REASON_CORRUPTED_SUMMARY,
- STOP_CP_REASON_UPDATE_INODE,
- STOP_CP_REASON_FLUSH_FAIL,
- STOP_CP_REASON_MAX,
- };
- #define MAX_STOP_REASON 32
- /* detail reason for EFSCORRUPTED */
- enum f2fs_error {
- ERROR_CORRUPTED_CLUSTER,
- ERROR_FAIL_DECOMPRESSION,
- ERROR_INVALID_BLKADDR,
- ERROR_CORRUPTED_DIRENT,
- ERROR_CORRUPTED_INODE,
- ERROR_INCONSISTENT_SUMMARY,
- ERROR_INCONSISTENT_FOOTER,
- ERROR_INCONSISTENT_SUM_TYPE,
- ERROR_CORRUPTED_JOURNAL,
- ERROR_INCONSISTENT_NODE_COUNT,
- ERROR_INCONSISTENT_BLOCK_COUNT,
- ERROR_INVALID_CURSEG,
- ERROR_INCONSISTENT_SIT,
- ERROR_CORRUPTED_VERITY_XATTR,
- ERROR_CORRUPTED_XATTR,
- ERROR_MAX,
- };
- #define MAX_F2FS_ERRORS 16
- 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][F2FS_EXTENSION_LEN];/* 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 */
- struct f2fs_device devs[MAX_DEVICES]; /* device list */
- __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */
- __u8 hot_ext_count; /* # of hot file extension */
- __le16 s_encoding; /* Filename charset encoding */
- __le16 s_encoding_flags; /* Filename charset encoding flags */
- __u8 s_stop_reason[MAX_STOP_REASON]; /* stop checkpoint reason */
- __u8 s_errors[MAX_F2FS_ERRORS]; /* reason of image corrupts */
- __u8 reserved[258]; /* valid reserved region */
- __le32 crc; /* checksum of superblock */
- } __packed;
- /*
- * For checkpoint
- */
- #define CP_RESIZEFS_FLAG 0x00004000
- #define CP_DISABLED_QUICK_FLAG 0x00002000
- #define CP_DISABLED_FLAG 0x00001000
- #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800
- #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400
- #define CP_NOCRC_RECOVERY_FLAG 0x00000200
- #define CP_TRIMMED_FLAG 0x00000100
- #define CP_NAT_BITS_FLAG 0x00000080
- #define CP_CRC_RECOVERY_FLAG 0x00000040
- #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[];
- } __packed;
- #define CP_CHKSUM_OFFSET (F2FS_BLKSIZE - sizeof(__le32)) /* default chksum offset in checkpoint */
- #define CP_MIN_CHKSUM_OFFSET \
- (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap))
- /*
- * For orphan inode management
- */
- #define F2FS_ORPHANS_PER_BLOCK ((F2FS_BLKSIZE - 4 * sizeof(__le32)) / sizeof(__le32))
- #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; /* length of the extent */
- } __packed;
- #define F2FS_NAME_LEN 255
- /* 200 bytes for inline xattrs by default */
- #define DEFAULT_INLINE_XATTR_ADDRS 50
- #define OFFSET_OF_END_OF_I_EXT 360
- #define SIZE_OF_I_NID 20
- struct node_footer {
- __le32 nid; /* node id */
- __le32 ino; /* inode number */
- __le32 flag; /* include cold/fsync/dentry marks and offset */
- __le64 cp_ver; /* checkpoint version */
- __le32 next_blkaddr; /* next node page block address */
- } __packed;
- /* Address Pointers in an Inode */
- #define DEF_ADDRS_PER_INODE ((F2FS_BLKSIZE - OFFSET_OF_END_OF_I_EXT \
- - SIZE_OF_I_NID \
- - sizeof(struct node_footer)) / sizeof(__le32))
- #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \
- get_extra_isize(inode))
- #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */
- #define ADDRS_PER_INODE(inode) addrs_per_inode(inode)
- /* Address Pointers in a Direct Block */
- #define DEF_ADDRS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32))
- #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode)
- /* Node IDs in an Indirect Block */
- #define NIDS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32))
- #define ADDRS_PER_PAGE(page, inode) \
- (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode))
- #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 F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */
- #define F2FS_PIN_FILE 0x40 /* file should not be gced */
- #define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */
- 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) */
- union {
- __le32 i_current_depth; /* only for directory depth */
- __le16 i_gc_failures; /*
- * # of gc failures on pinned file.
- * only for regular files.
- */
- };
- __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 */
- union {
- struct {
- __le16 i_extra_isize; /* extra inode attribute size */
- __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */
- __le32 i_projid; /* project id */
- __le32 i_inode_checksum;/* inode meta checksum */
- __le64 i_crtime; /* creation time */
- __le32 i_crtime_nsec; /* creation time in nano scale */
- __le64 i_compr_blocks; /* # of compressed blocks */
- __u8 i_compress_algorithm; /* compress algorithm */
- __u8 i_log_cluster_size; /* log of cluster size */
- __le16 i_compress_flag; /* compress flag */
- /* 0 bit: chksum flag
- * [8,15] bits: compress level
- */
- __le32 i_extra_end[0]; /* for attribute size calculation */
- } __packed;
- __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[DEF_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 GENMASK(OFFSET_BIT_SHIFT - 1, 0)
- 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 (F2FS_BLKSIZE / 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
- *
- * A validity bitmap of 64 bytes covers 512 blocks of area. For a 4K page size,
- * this results in a segment size of 2MB. For 16k pages, the default segment size
- * is 8MB.
- * Not allow to change this.
- */
- #define SIT_VBLOCK_MAP_SIZE 64
- #define SIT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / sizeof(struct f2fs_sit_entry))
- /*
- * F2FS uses 4 bytes to represent block address. As a result, supported size of
- * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
- */
- #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2)
- /*
- * 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 one 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 (F2FS_BLKSIZE / 8)
- #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 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;
- /* Block-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 BIT((MAX_DIR_HASH_DEPTH / 2) - 1)
- /*
- * space utilization of regular dentry and inline dentry (w/o extra reservation)
- * regular dentry inline dentry (def) inline dentry (min)
- * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1
- * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1
- * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22
- * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16
- * total 4096 3488 40
- *
- * Note: there are more reserved space in inline dentry than in regular
- * dentry, when converting inline dentry we should handle this carefully.
- */
- /* the number of dentry in a block */
- #define NR_DENTRY_IN_BLOCK ((BITS_PER_BYTE * F2FS_BLKSIZE) / \
- ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * BITS_PER_BYTE + 1))
- #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 (F2FS_BLKSIZE - ((SIZE_OF_DIR_ENTRY + \
- F2FS_SLOT_LEN) * \
- NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
- #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */
- /* 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; /* length of file name */
- __u8 file_type; /* file type */
- } __packed;
- /* Block-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;
- #define F2FS_DEF_PROJID 0 /* default project ID */
- #endif /* _LINUX_F2FS_FS_H */
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