include/linux/f2fs_fs.h

   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_MIN_LOG_SECTOR_SIZE        9       /* 9 bits for 512 bytes */
  19 #define F2FS_MAX_LOG_SECTOR_SIZE        12      /* 12 bits for 4096 bytes */
  20 #define F2FS_LOG_SECTORS_PER_BLOCK      3       /* log number for sector/blk */
  21 #define F2FS_BLKSIZE                    4096    /* support only 4KB block */
  22 #define F2FS_BLKSIZE_BITS               12      /* bits for F2FS_BLKSIZE */
  23 #define F2FS_MAX_EXTENSION              64      /* # of extension entries */
  24 #define F2FS_BLK_ALIGN(x)       (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)
  25
  26 #define NULL_ADDR               ((block_t)0)    /* used as block_t addresses */
  27 #define NEW_ADDR                ((block_t)-1)   /* used as block_t addresses */
  28
  29 #define F2FS_BYTES_TO_BLK(bytes)        ((bytes) >> F2FS_BLKSIZE_BITS)
  30 #define F2FS_BLK_TO_BYTES(blk)          ((blk) << F2FS_BLKSIZE_BITS)
  31
  32 /* 0, 1(node nid), 2(meta nid) are reserved node id */
  33 #define F2FS_RESERVED_NODE_NUM          3
  34
  35 #define F2FS_ROOT_INO(sbi)      ((sbi)->root_ino_num)
  36 #define F2FS_NODE_INO(sbi)      ((sbi)->node_ino_num)
  37 #define F2FS_META_INO(sbi)      ((sbi)->meta_ino_num)
  38
  39 #define F2FS_IO_SIZE(sbi)       (1 << (sbi)->write_io_size_bits) /* Blocks */
  40 #define F2FS_IO_SIZE_KB(sbi)    (1 << ((sbi)->write_io_size_bits + 2)) /* KB */
  41 #define F2FS_IO_SIZE_BYTES(sbi) (1 << ((sbi)->write_io_size_bits + 12)) /* B */
  42 #define F2FS_IO_SIZE_BITS(sbi)  ((sbi)->write_io_size_bits) /* power of 2 */
  43 #define F2FS_IO_SIZE_MASK(sbi)  (F2FS_IO_SIZE(sbi) - 1)
  44
  45 /* This flag is used by node and meta inodes, and by recovery */
  46 #define GFP_F2FS_ZERO           (GFP_NOFS | __GFP_ZERO)
  47 #define GFP_F2FS_HIGH_ZERO      (GFP_NOFS | __GFP_ZERO | __GFP_HIGHMEM)
  48
  49 /*
  50  * For further optimization on multi-head logs, on-disk layout supports maximum
  51  * 16 logs by default. The number, 16, is expected to cover all the cases
  52  * enoughly. The implementaion currently uses no more than 6 logs.
  53  * Half the logs are used for nodes, and the other half are used for data.
  54  */
  55 #define MAX_ACTIVE_LOGS 16
  56 #define MAX_ACTIVE_NODE_LOGS    8
  57 #define MAX_ACTIVE_DATA_LOGS    8
  58
  59 #define VERSION_LEN     256
  60 #define MAX_VOLUME_NAME         512
  61 #define MAX_PATH_LEN            64
  62 #define MAX_DEVICES             8
  63
  64 /*
  65  * For superblock
  66  */
  67 struct f2fs_device {
  68         __u8 path[MAX_PATH_LEN];
  69         __le32 total_segments;
  70 } __packed;
  71
  72 struct f2fs_super_block {
  73         __le32 magic;                   /* Magic Number */
  74         __le16 major_ver;               /* Major Version */
  75         __le16 minor_ver;               /* Minor Version */
  76         __le32 log_sectorsize;          /* log2 sector size in bytes */
  77         __le32 log_sectors_per_block;   /* log2 # of sectors per block */
  78         __le32 log_blocksize;           /* log2 block size in bytes */
  79         __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
  80         __le32 segs_per_sec;            /* # of segments per section */
  81         __le32 secs_per_zone;           /* # of sections per zone */
  82         __le32 checksum_offset;         /* checksum offset inside super block */
  83         __le64 block_count;             /* total # of user blocks */
  84         __le32 section_count;           /* total # of sections */
  85         __le32 segment_count;           /* total # of segments */
  86         __le32 segment_count_ckpt;      /* # of segments for checkpoint */
  87         __le32 segment_count_sit;       /* # of segments for SIT */
  88         __le32 segment_count_nat;       /* # of segments for NAT */
  89         __le32 segment_count_ssa;       /* # of segments for SSA */
  90         __le32 segment_count_main;      /* # of segments for main area */
  91         __le32 segment0_blkaddr;        /* start block address of segment 0 */
  92         __le32 cp_blkaddr;              /* start block address of checkpoint */
  93         __le32 sit_blkaddr;             /* start block address of SIT */
  94         __le32 nat_blkaddr;             /* start block address of NAT */
  95         __le32 ssa_blkaddr;             /* start block address of SSA */
  96         __le32 main_blkaddr;            /* start block address of main area */
  97         __le32 root_ino;                /* root inode number */
  98         __le32 node_ino;                /* node inode number */
  99         __le32 meta_ino;                /* meta inode number */
 100         __u8 uuid[16];                  /* 128-bit uuid for volume */
 101         __le16 volume_name[MAX_VOLUME_NAME];    /* volume name */
 102         __le32 extension_count;         /* # of extensions below */
 103         __u8 extension_list[F2FS_MAX_EXTENSION][8];     /* extension array */
 104         __le32 cp_payload;
 105         __u8 version[VERSION_LEN];      /* the kernel version */
 106         __u8 init_version[VERSION_LEN]; /* the initial kernel version */
 107         __le32 feature;                 /* defined features */
 108         __u8 encryption_level;          /* versioning level for encryption */
 109         __u8 encrypt_pw_salt[16];       /* Salt used for string2key algorithm */
 110         struct f2fs_device devs[MAX_DEVICES];   /* device list */
 111         __u8 reserved[327];             /* valid reserved region */
 112 } __packed;
 113
 114 /*
 115  * For checkpoint
 116  */
 117 #define CP_TRIMMED_FLAG         0x00000100
 118 #define CP_NAT_BITS_FLAG        0x00000080
 119 #define CP_CRC_RECOVERY_FLAG    0x00000040
 120 #define CP_FASTBOOT_FLAG        0x00000020
 121 #define CP_FSCK_FLAG            0x00000010
 122 #define CP_ERROR_FLAG           0x00000008
 123 #define CP_COMPACT_SUM_FLAG     0x00000004
 124 #define CP_ORPHAN_PRESENT_FLAG  0x00000002
 125 #define CP_UMOUNT_FLAG          0x00000001
 126
 127 #define F2FS_CP_PACKS           2       /* # of checkpoint packs */
 128
 129 struct f2fs_checkpoint {
 130         __le64 checkpoint_ver;          /* checkpoint block version number */
 131         __le64 user_block_count;        /* # of user blocks */
 132         __le64 valid_block_count;       /* # of valid blocks in main area */
 133         __le32 rsvd_segment_count;      /* # of reserved segments for gc */
 134         __le32 overprov_segment_count;  /* # of overprovision segments */
 135         __le32 free_segment_count;      /* # of free segments in main area */
 136
 137         /* information of current node segments */
 138         __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
 139         __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
 140         /* information of current data segments */
 141         __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
 142         __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
 143         __le32 ckpt_flags;              /* Flags : umount and journal_present */
 144         __le32 cp_pack_total_block_count;       /* total # of one cp pack */
 145         __le32 cp_pack_start_sum;       /* start block number of data summary */
 146         __le32 valid_node_count;        /* Total number of valid nodes */
 147         __le32 valid_inode_count;       /* Total number of valid inodes */
 148         __le32 next_free_nid;           /* Next free node number */
 149         __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
 150         __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
 151         __le32 checksum_offset;         /* checksum offset inside cp block */
 152         __le64 elapsed_time;            /* mounted time */
 153         /* allocation type of current segment */
 154         unsigned char alloc_type[MAX_ACTIVE_LOGS];
 155
 156         /* SIT and NAT version bitmap */
 157         unsigned char sit_nat_version_bitmap[1];
 158 } __packed;
 159
 160 /*
 161  * For orphan inode management
 162  */
 163 #define F2FS_ORPHANS_PER_BLOCK  1020
 164
 165 #define GET_ORPHAN_BLOCKS(n)    (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \
 166                                         F2FS_ORPHANS_PER_BLOCK)
 167
 168 struct f2fs_orphan_block {
 169         __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
 170         __le32 reserved;        /* reserved */
 171         __le16 blk_addr;        /* block index in current CP */
 172         __le16 blk_count;       /* Number of orphan inode blocks in CP */
 173         __le32 entry_count;     /* Total number of orphan nodes in current CP */
 174         __le32 check_sum;       /* CRC32 for orphan inode block */
 175 } __packed;
 176
 177 /*
 178  * For NODE structure
 179  */
 180 struct f2fs_extent {
 181         __le32 fofs;            /* start file offset of the extent */
 182         __le32 blk;             /* start block address of the extent */
 183         __le32 len;             /* lengh of the extent */
 184 } __packed;
 185
 186 #define F2FS_NAME_LEN           255
 187 #define F2FS_INLINE_XATTR_ADDRS 50      /* 200 bytes for inline xattrs */
 188 #define DEF_ADDRS_PER_INODE     923     /* Address Pointers in an Inode */
 189 #define DEF_NIDS_PER_INODE      5       /* Node IDs in an Inode */
 190 #define ADDRS_PER_INODE(inode)  addrs_per_inode(inode)
 191 #define ADDRS_PER_BLOCK         1018    /* Address Pointers in a Direct Block */
 192 #define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
 193
 194 #define ADDRS_PER_PAGE(page, inode)     \
 195         (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK)
 196
 197 #define NODE_DIR1_BLOCK         (DEF_ADDRS_PER_INODE + 1)
 198 #define NODE_DIR2_BLOCK         (DEF_ADDRS_PER_INODE + 2)
 199 #define NODE_IND1_BLOCK         (DEF_ADDRS_PER_INODE + 3)
 200 #define NODE_IND2_BLOCK         (DEF_ADDRS_PER_INODE + 4)
 201 #define NODE_DIND_BLOCK         (DEF_ADDRS_PER_INODE + 5)
 202
 203 #define F2FS_INLINE_XATTR       0x01    /* file inline xattr flag */
 204 #define F2FS_INLINE_DATA        0x02    /* file inline data flag */
 205 #define F2FS_INLINE_DENTRY      0x04    /* file inline dentry flag */
 206 #define F2FS_DATA_EXIST         0x08    /* file inline data exist flag */
 207 #define F2FS_INLINE_DOTS        0x10    /* file having implicit dot dentries */
 208
 209 #define MAX_INLINE_DATA         (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
 210                                                 F2FS_INLINE_XATTR_ADDRS - 1))
 211
 212 struct f2fs_inode {
 213         __le16 i_mode;                  /* file mode */
 214         __u8 i_advise;                  /* file hints */
 215         __u8 i_inline;                  /* file inline flags */
 216         __le32 i_uid;                   /* user ID */
 217         __le32 i_gid;                   /* group ID */
 218         __le32 i_links;                 /* links count */
 219         __le64 i_size;                  /* file size in bytes */
 220         __le64 i_blocks;                /* file size in blocks */
 221         __le64 i_atime;                 /* access time */
 222         __le64 i_ctime;                 /* change time */
 223         __le64 i_mtime;                 /* modification time */
 224         __le32 i_atime_nsec;            /* access time in nano scale */
 225         __le32 i_ctime_nsec;            /* change time in nano scale */
 226         __le32 i_mtime_nsec;            /* modification time in nano scale */
 227         __le32 i_generation;            /* file version (for NFS) */
 228         __le32 i_current_depth;         /* only for directory depth */
 229         __le32 i_xattr_nid;             /* nid to save xattr */
 230         __le32 i_flags;                 /* file attributes */
 231         __le32 i_pino;                  /* parent inode number */
 232         __le32 i_namelen;               /* file name length */
 233         __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
 234         __u8 i_dir_level;               /* dentry_level for large dir */
 235
 236         struct f2fs_extent i_ext;       /* caching a largest extent */
 237
 238         __le32 i_addr[DEF_ADDRS_PER_INODE];     /* Pointers to data blocks */
 239
 240         __le32 i_nid[DEF_NIDS_PER_INODE];       /* direct(2), indirect(2),
 241                                                 double_indirect(1) node id */
 242 } __packed;
 243
 244 struct direct_node {
 245         __le32 addr[ADDRS_PER_BLOCK];   /* array of data block address */
 246 } __packed;
 247
 248 struct indirect_node {
 249         __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
 250 } __packed;
 251
 252 enum {
 253         COLD_BIT_SHIFT = 0,
 254         FSYNC_BIT_SHIFT,
 255         DENT_BIT_SHIFT,
 256         OFFSET_BIT_SHIFT
 257 };
 258
 259 #define OFFSET_BIT_MASK         (0x07)  /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
 260
 261 struct node_footer {
 262         __le32 nid;             /* node id */
 263         __le32 ino;             /* inode nunmber */
 264         __le32 flag;            /* include cold/fsync/dentry marks and offset */
 265         __le64 cp_ver;          /* checkpoint version */
 266         __le32 next_blkaddr;    /* next node page block address */
 267 } __packed;
 268
 269 struct f2fs_node {
 270         /* can be one of three types: inode, direct, and indirect types */
 271         union {
 272                 struct f2fs_inode i;
 273                 struct direct_node dn;
 274                 struct indirect_node in;
 275         };
 276         struct node_footer footer;
 277 } __packed;
 278
 279 /*
 280  * For NAT entries
 281  */
 282 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry))
 283 #define NAT_ENTRY_BITMAP_SIZE   ((NAT_ENTRY_PER_BLOCK + 7) / 8)
 284
 285 struct f2fs_nat_entry {
 286         __u8 version;           /* latest version of cached nat entry */
 287         __le32 ino;             /* inode number */
 288         __le32 block_addr;      /* block address */
 289 } __packed;
 290
 291 struct f2fs_nat_block {
 292         struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
 293 } __packed;
 294
 295 /*
 296  * For SIT entries
 297  *
 298  * Each segment is 2MB in size by default so that a bitmap for validity of
 299  * there-in blocks should occupy 64 bytes, 512 bits.
 300  * Not allow to change this.
 301  */
 302 #define SIT_VBLOCK_MAP_SIZE 64
 303 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
 304
 305 /*
 306  * F2FS uses 4 bytes to represent block address. As a result, supported size of
 307  * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
 308  */
 309 #define F2FS_MAX_SEGMENT       ((16 * 1024 * 1024) / 2)
 310
 311 /*
 312  * Note that f2fs_sit_entry->vblocks has the following bit-field information.
 313  * [15:10] : allocation type such as CURSEG_XXXX_TYPE
 314  * [9:0] : valid block count
 315  */
 316 #define SIT_VBLOCKS_SHIFT       10
 317 #define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
 318 #define GET_SIT_VBLOCKS(raw_sit)                                \
 319         (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
 320 #define GET_SIT_TYPE(raw_sit)                                   \
 321         ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
 322          >> SIT_VBLOCKS_SHIFT)
 323
 324 struct f2fs_sit_entry {
 325         __le16 vblocks;                         /* reference above */
 326         __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
 327         __le64 mtime;                           /* segment age for cleaning */
 328 } __packed;
 329
 330 struct f2fs_sit_block {
 331         struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
 332 } __packed;
 333
 334 /*
 335  * For segment summary
 336  *
 337  * One summary block contains exactly 512 summary entries, which represents
 338  * exactly 2MB segment by default. Not allow to change the basic units.
 339  *
 340  * NOTE: For initializing fields, you must use set_summary
 341  *
 342  * - If data page, nid represents dnode's nid
 343  * - If node page, nid represents the node page's nid.
 344  *
 345  * The ofs_in_node is used by only data page. It represents offset
 346  * from node's page's beginning to get a data block address.
 347  * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
 348  */
 349 #define ENTRIES_IN_SUM          512
 350 #define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
 351 #define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
 352 #define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
 353
 354 /* a summary entry for a 4KB-sized block in a segment */
 355 struct f2fs_summary {
 356         __le32 nid;             /* parent node id */
 357         union {
 358                 __u8 reserved[3];
 359                 struct {
 360                         __u8 version;           /* node version number */
 361                         __le16 ofs_in_node;     /* block index in parent node */
 362                 } __packed;
 363         };
 364 } __packed;
 365
 366 /* summary block type, node or data, is stored to the summary_footer */
 367 #define SUM_TYPE_NODE           (1)
 368 #define SUM_TYPE_DATA           (0)
 369
 370 struct summary_footer {
 371         unsigned char entry_type;       /* SUM_TYPE_XXX */
 372         __le32 check_sum;               /* summary checksum */
 373 } __packed;
 374
 375 #define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
 376                                 SUM_ENTRY_SIZE)
 377 #define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
 378                                 sizeof(struct nat_journal_entry))
 379 #define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
 380                                 sizeof(struct nat_journal_entry))
 381 #define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
 382                                 sizeof(struct sit_journal_entry))
 383 #define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
 384                                 sizeof(struct sit_journal_entry))
 385
 386 /* Reserved area should make size of f2fs_extra_info equals to
 387  * that of nat_journal and sit_journal.
 388  */
 389 #define EXTRA_INFO_RESERVED     (SUM_JOURNAL_SIZE - 2 - 8)
 390
 391 /*
 392  * frequently updated NAT/SIT entries can be stored in the spare area in
 393  * summary blocks
 394  */
 395 enum {
 396         NAT_JOURNAL = 0,
 397         SIT_JOURNAL
 398 };
 399
 400 struct nat_journal_entry {
 401         __le32 nid;
 402         struct f2fs_nat_entry ne;
 403 } __packed;
 404
 405 struct nat_journal {
 406         struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
 407         __u8 reserved[NAT_JOURNAL_RESERVED];
 408 } __packed;
 409
 410 struct sit_journal_entry {
 411         __le32 segno;
 412         struct f2fs_sit_entry se;
 413 } __packed;
 414
 415 struct sit_journal {
 416         struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
 417         __u8 reserved[SIT_JOURNAL_RESERVED];
 418 } __packed;
 419
 420 struct f2fs_extra_info {
 421         __le64 kbytes_written;
 422         __u8 reserved[EXTRA_INFO_RESERVED];
 423 } __packed;
 424
 425 struct f2fs_journal {
 426         union {
 427                 __le16 n_nats;
 428                 __le16 n_sits;
 429         };
 430         /* spare area is used by NAT or SIT journals or extra info */
 431         union {
 432                 struct nat_journal nat_j;
 433                 struct sit_journal sit_j;
 434                 struct f2fs_extra_info info;
 435         };
 436 } __packed;
 437
 438 /* 4KB-sized summary block structure */
 439 struct f2fs_summary_block {
 440         struct f2fs_summary entries[ENTRIES_IN_SUM];
 441         struct f2fs_journal journal;
 442         struct summary_footer footer;
 443 } __packed;
 444
 445 /*
 446  * For directory operations
 447  */
 448 #define F2FS_DOT_HASH           0
 449 #define F2FS_DDOT_HASH          F2FS_DOT_HASH
 450 #define F2FS_MAX_HASH           (~((0x3ULL) << 62))
 451 #define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
 452
 453 typedef __le32  f2fs_hash_t;
 454
 455 /* One directory entry slot covers 8bytes-long file name */
 456 #define F2FS_SLOT_LEN           8
 457 #define F2FS_SLOT_LEN_BITS      3
 458
 459 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
 460
 461 /* MAX level for dir lookup */
 462 #define MAX_DIR_HASH_DEPTH      63
 463
 464 /* MAX buckets in one level of dir */
 465 #define MAX_DIR_BUCKETS         (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
 466
 467 /*
 468  * space utilization of regular dentry and inline dentry
 469  *              regular dentry                  inline dentry
 470  * bitmap       1 * 27 = 27                     1 * 23 = 23
 471  * reserved     1 * 3 = 3                       1 * 7 = 7
 472  * dentry       11 * 214 = 2354                 11 * 182 = 2002
 473  * filename     8 * 214 = 1712                  8 * 182 = 1456
 474  * total        4096                            3488
 475  *
 476  * Note: there are more reserved space in inline dentry than in regular
 477  * dentry, when converting inline dentry we should handle this carefully.
 478  */
 479 #define NR_DENTRY_IN_BLOCK      214     /* the number of dentry in a block */
 480 #define SIZE_OF_DIR_ENTRY       11      /* by byte */
 481 #define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
 482                                         BITS_PER_BYTE)
 483 #define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
 484                                 F2FS_SLOT_LEN) * \
 485                                 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
 486
 487 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
 488 struct f2fs_dir_entry {
 489         __le32 hash_code;       /* hash code of file name */
 490         __le32 ino;             /* inode number */
 491         __le16 name_len;        /* lengh of file name */
 492         __u8 file_type;         /* file type */
 493 } __packed;
 494
 495 /* 4KB-sized directory entry block */
 496 struct f2fs_dentry_block {
 497         /* validity bitmap for directory entries in each block */
 498         __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
 499         __u8 reserved[SIZE_OF_RESERVED];
 500         struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
 501         __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
 502 } __packed;
 503
 504 /* for inline dir */
 505 #define NR_INLINE_DENTRY        (MAX_INLINE_DATA * BITS_PER_BYTE / \
 506                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
 507                                 BITS_PER_BYTE + 1))
 508 #define INLINE_DENTRY_BITMAP_SIZE       ((NR_INLINE_DENTRY + \
 509                                         BITS_PER_BYTE - 1) / BITS_PER_BYTE)
 510 #define INLINE_RESERVED_SIZE    (MAX_INLINE_DATA - \
 511                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
 512                                 NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE))
 513
 514 /* inline directory entry structure */
 515 struct f2fs_inline_dentry {
 516         __u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
 517         __u8 reserved[INLINE_RESERVED_SIZE];
 518         struct f2fs_dir_entry dentry[NR_INLINE_DENTRY];
 519         __u8 filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN];
 520 } __packed;
 521
 522 /* file types used in inode_info->flags */
 523 enum {
 524         F2FS_FT_UNKNOWN,
 525         F2FS_FT_REG_FILE,
 526         F2FS_FT_DIR,
 527         F2FS_FT_CHRDEV,
 528         F2FS_FT_BLKDEV,
 529         F2FS_FT_FIFO,
 530         F2FS_FT_SOCK,
 531         F2FS_FT_SYMLINK,
 532         F2FS_FT_MAX
 533 };
 534
 535 #define S_SHIFT 12
 536
 537 #endif  /* _LINUX_F2FS_FS_H */