| // 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 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_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_MAX_QUOTAS 3 |
| |
| #define F2FS_ENC_UTF8_12_1 1 |
| |
| #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ |
| #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */ |
| #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */ |
| #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; |
| |
| 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 reserved[306]; /* 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[1]; |
| } __packed; |
| |
| #define CP_CHKSUM_OFFSET 4092 /* 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 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; /* length of the extent */ |
| } __packed; |
| |
| #define F2FS_NAME_LEN 255 |
| /* 200 bytes for inline xattrs by default */ |
| #define DEFAULT_INLINE_XATTR_ADDRS 50 |
| #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ |
| #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) |
| #define DEF_ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ |
| #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) |
| #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(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 */ |
| |
| 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 |
| * [10,15] 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 (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */ |
| |
| 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; |
| |
| 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)) |
| |
| /* |
| * 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 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 (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. |
| */ |
| #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)) |
| #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; |
| |
| /* 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 |
| }; |
| |
| #define S_SHIFT 12 |
| |
| #define F2FS_DEF_PROJID 0 /* default project ID */ |
| |
| #endif /* _LINUX_F2FS_FS_H */ |