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 /* This flag is used by node and meta inodes, and by recovery */
  40 #define GFP_F2FS_ZERO           (GFP_NOFS | __GFP_ZERO)
  41 #define GFP_F2FS_HIGH_ZERO      (GFP_NOFS | __GFP_ZERO | __GFP_HIGHMEM)
  42
  43 /*
  44  * For further optimization on multi-head logs, on-disk layout supports maximum
  45  * 16 logs by default. The number, 16, is expected to cover all the cases
  46  * enoughly. The implementaion currently uses no more than 6 logs.
  47  * Half the logs are used for nodes, and the other half are used for data.
  48  */
  49 #define MAX_ACTIVE_LOGS 16
  50 #define MAX_ACTIVE_NODE_LOGS    8
  51 #define MAX_ACTIVE_DATA_LOGS    8
  52
  53 #define VERSION_LEN     256
  54 #define MAX_VOLUME_NAME         512
  55
  56 /*
  57  * For superblock
  58  */
  59 struct f2fs_super_block {
  60         __le32 magic;                   /* Magic Number */
  61         __le16 major_ver;               /* Major Version */
  62         __le16 minor_ver;               /* Minor Version */
  63         __le32 log_sectorsize;          /* log2 sector size in bytes */
  64         __le32 log_sectors_per_block;   /* log2 # of sectors per block */
  65         __le32 log_blocksize;           /* log2 block size in bytes */
  66         __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
  67         __le32 segs_per_sec;            /* # of segments per section */
  68         __le32 secs_per_zone;           /* # of sections per zone */
  69         __le32 checksum_offset;         /* checksum offset inside super block */
  70         __le64 block_count;             /* total # of user blocks */
  71         __le32 section_count;           /* total # of sections */
  72         __le32 segment_count;           /* total # of segments */
  73         __le32 segment_count_ckpt;      /* # of segments for checkpoint */
  74         __le32 segment_count_sit;       /* # of segments for SIT */
  75         __le32 segment_count_nat;       /* # of segments for NAT */
  76         __le32 segment_count_ssa;       /* # of segments for SSA */
  77         __le32 segment_count_main;      /* # of segments for main area */
  78         __le32 segment0_blkaddr;        /* start block address of segment 0 */
  79         __le32 cp_blkaddr;              /* start block address of checkpoint */
  80         __le32 sit_blkaddr;             /* start block address of SIT */
  81         __le32 nat_blkaddr;             /* start block address of NAT */
  82         __le32 ssa_blkaddr;             /* start block address of SSA */
  83         __le32 main_blkaddr;            /* start block address of main area */
  84         __le32 root_ino;                /* root inode number */
  85         __le32 node_ino;                /* node inode number */
  86         __le32 meta_ino;                /* meta inode number */
  87         __u8 uuid[16];                  /* 128-bit uuid for volume */
  88         __le16 volume_name[MAX_VOLUME_NAME];    /* volume name */
  89         __le32 extension_count;         /* # of extensions below */
  90         __u8 extension_list[F2FS_MAX_EXTENSION][8];     /* extension array */
  91         __le32 cp_payload;
  92         __u8 version[VERSION_LEN];      /* the kernel version */
  93         __u8 init_version[VERSION_LEN]; /* the initial kernel version */
  94         __le32 feature;                 /* defined features */
  95         __u8 encryption_level;          /* versioning level for encryption */
  96         __u8 encrypt_pw_salt[16];       /* Salt used for string2key algorithm */
  97         __u8 reserved[871];             /* valid reserved region */
  98 } __packed;
  99
 100 /*
 101  * For checkpoint
 102  */
 103 #define CP_FASTBOOT_FLAG        0x00000020
 104 #define CP_FSCK_FLAG            0x00000010
 105 #define CP_ERROR_FLAG           0x00000008
 106 #define CP_COMPACT_SUM_FLAG     0x00000004
 107 #define CP_ORPHAN_PRESENT_FLAG  0x00000002
 108 #define CP_UMOUNT_FLAG          0x00000001
 109
 110 #define F2FS_CP_PACKS           2       /* # of checkpoint packs */
 111
 112 struct f2fs_checkpoint {
 113         __le64 checkpoint_ver;          /* checkpoint block version number */
 114         __le64 user_block_count;        /* # of user blocks */
 115         __le64 valid_block_count;       /* # of valid blocks in main area */
 116         __le32 rsvd_segment_count;      /* # of reserved segments for gc */
 117         __le32 overprov_segment_count;  /* # of overprovision segments */
 118         __le32 free_segment_count;      /* # of free segments in main area */
 119
 120         /* information of current node segments */
 121         __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
 122         __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
 123         /* information of current data segments */
 124         __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
 125         __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
 126         __le32 ckpt_flags;              /* Flags : umount and journal_present */
 127         __le32 cp_pack_total_block_count;       /* total # of one cp pack */
 128         __le32 cp_pack_start_sum;       /* start block number of data summary */
 129         __le32 valid_node_count;        /* Total number of valid nodes */
 130         __le32 valid_inode_count;       /* Total number of valid inodes */
 131         __le32 next_free_nid;           /* Next free node number */
 132         __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
 133         __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
 134         __le32 checksum_offset;         /* checksum offset inside cp block */
 135         __le64 elapsed_time;            /* mounted time */
 136         /* allocation type of current segment */
 137         unsigned char alloc_type[MAX_ACTIVE_LOGS];
 138
 139         /* SIT and NAT version bitmap */
 140         unsigned char sit_nat_version_bitmap[1];
 141 } __packed;
 142
 143 /*
 144  * For orphan inode management
 145  */
 146 #define F2FS_ORPHANS_PER_BLOCK  1020
 147
 148 #define GET_ORPHAN_BLOCKS(n)    ((n + F2FS_ORPHANS_PER_BLOCK - 1) / \
 149                                         F2FS_ORPHANS_PER_BLOCK)
 150
 151 struct f2fs_orphan_block {
 152         __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
 153         __le32 reserved;        /* reserved */
 154         __le16 blk_addr;        /* block index in current CP */
 155         __le16 blk_count;       /* Number of orphan inode blocks in CP */
 156         __le32 entry_count;     /* Total number of orphan nodes in current CP */
 157         __le32 check_sum;       /* CRC32 for orphan inode block */
 158 } __packed;
 159
 160 /*
 161  * For NODE structure
 162  */
 163 struct f2fs_extent {
 164         __le32 fofs;            /* start file offset of the extent */
 165         __le32 blk;             /* start block address of the extent */
 166         __le32 len;             /* lengh of the extent */
 167 } __packed;
 168
 169 #define F2FS_NAME_LEN           255
 170 #define F2FS_INLINE_XATTR_ADDRS 50      /* 200 bytes for inline xattrs */
 171 #define DEF_ADDRS_PER_INODE     923     /* Address Pointers in an Inode */
 172 #define DEF_NIDS_PER_INODE      5       /* Node IDs in an Inode */
 173 #define ADDRS_PER_INODE(inode)  addrs_per_inode(inode)
 174 #define ADDRS_PER_BLOCK         1018    /* Address Pointers in a Direct Block */
 175 #define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
 176
 177 #define ADDRS_PER_PAGE(page, inode)     \
 178         (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK)
 179
 180 #define NODE_DIR1_BLOCK         (DEF_ADDRS_PER_INODE + 1)
 181 #define NODE_DIR2_BLOCK         (DEF_ADDRS_PER_INODE + 2)
 182 #define NODE_IND1_BLOCK         (DEF_ADDRS_PER_INODE + 3)
 183 #define NODE_IND2_BLOCK         (DEF_ADDRS_PER_INODE + 4)
 184 #define NODE_DIND_BLOCK         (DEF_ADDRS_PER_INODE + 5)
 185
 186 #define F2FS_INLINE_XATTR       0x01    /* file inline xattr flag */
 187 #define F2FS_INLINE_DATA        0x02    /* file inline data flag */
 188 #define F2FS_INLINE_DENTRY      0x04    /* file inline dentry flag */
 189 #define F2FS_DATA_EXIST         0x08    /* file inline data exist flag */
 190 #define F2FS_INLINE_DOTS        0x10    /* file having implicit dot dentries */
 191
 192 #define MAX_INLINE_DATA         (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
 193                                                 F2FS_INLINE_XATTR_ADDRS - 1))
 194
 195 struct f2fs_inode {
 196         __le16 i_mode;                  /* file mode */
 197         __u8 i_advise;                  /* file hints */
 198         __u8 i_inline;                  /* file inline flags */
 199         __le32 i_uid;                   /* user ID */
 200         __le32 i_gid;                   /* group ID */
 201         __le32 i_links;                 /* links count */
 202         __le64 i_size;                  /* file size in bytes */
 203         __le64 i_blocks;                /* file size in blocks */
 204         __le64 i_atime;                 /* access time */
 205         __le64 i_ctime;                 /* change time */
 206         __le64 i_mtime;                 /* modification time */
 207         __le32 i_atime_nsec;            /* access time in nano scale */
 208         __le32 i_ctime_nsec;            /* change time in nano scale */
 209         __le32 i_mtime_nsec;            /* modification time in nano scale */
 210         __le32 i_generation;            /* file version (for NFS) */
 211         __le32 i_current_depth;         /* only for directory depth */
 212         __le32 i_xattr_nid;             /* nid to save xattr */
 213         __le32 i_flags;                 /* file attributes */
 214         __le32 i_pino;                  /* parent inode number */
 215         __le32 i_namelen;               /* file name length */
 216         __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
 217         __u8 i_dir_level;               /* dentry_level for large dir */
 218
 219         struct f2fs_extent i_ext;       /* caching a largest extent */
 220
 221         __le32 i_addr[DEF_ADDRS_PER_INODE];     /* Pointers to data blocks */
 222
 223         __le32 i_nid[DEF_NIDS_PER_INODE];       /* direct(2), indirect(2),
 224                                                 double_indirect(1) node id */
 225 } __packed;
 226
 227 struct direct_node {
 228         __le32 addr[ADDRS_PER_BLOCK];   /* array of data block address */
 229 } __packed;
 230
 231 struct indirect_node {
 232         __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
 233 } __packed;
 234
 235 enum {
 236         COLD_BIT_SHIFT = 0,
 237         FSYNC_BIT_SHIFT,
 238         DENT_BIT_SHIFT,
 239         OFFSET_BIT_SHIFT
 240 };
 241
 242 #define OFFSET_BIT_MASK         (0x07)  /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
 243
 244 struct node_footer {
 245         __le32 nid;             /* node id */
 246         __le32 ino;             /* inode nunmber */
 247         __le32 flag;            /* include cold/fsync/dentry marks and offset */
 248         __le64 cp_ver;          /* checkpoint version */
 249         __le32 next_blkaddr;    /* next node page block address */
 250 } __packed;
 251
 252 struct f2fs_node {
 253         /* can be one of three types: inode, direct, and indirect types */
 254         union {
 255                 struct f2fs_inode i;
 256                 struct direct_node dn;
 257                 struct indirect_node in;
 258         };
 259         struct node_footer footer;
 260 } __packed;
 261
 262 /*
 263  * For NAT entries
 264  */
 265 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry))
 266
 267 struct f2fs_nat_entry {
 268         __u8 version;           /* latest version of cached nat entry */
 269         __le32 ino;             /* inode number */
 270         __le32 block_addr;      /* block address */
 271 } __packed;
 272
 273 struct f2fs_nat_block {
 274         struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
 275 } __packed;
 276
 277 /*
 278  * For SIT entries
 279  *
 280  * Each segment is 2MB in size by default so that a bitmap for validity of
 281  * there-in blocks should occupy 64 bytes, 512 bits.
 282  * Not allow to change this.
 283  */
 284 #define SIT_VBLOCK_MAP_SIZE 64
 285 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
 286
 287 /*
 288  * Note that f2fs_sit_entry->vblocks has the following bit-field information.
 289  * [15:10] : allocation type such as CURSEG_XXXX_TYPE
 290  * [9:0] : valid block count
 291  */
 292 #define SIT_VBLOCKS_SHIFT       10
 293 #define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
 294 #define GET_SIT_VBLOCKS(raw_sit)                                \
 295         (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
 296 #define GET_SIT_TYPE(raw_sit)                                   \
 297         ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
 298          >> SIT_VBLOCKS_SHIFT)
 299
 300 struct f2fs_sit_entry {
 301         __le16 vblocks;                         /* reference above */
 302         __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
 303         __le64 mtime;                           /* segment age for cleaning */
 304 } __packed;
 305
 306 struct f2fs_sit_block {
 307         struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
 308 } __packed;
 309
 310 /*
 311  * For segment summary
 312  *
 313  * One summary block contains exactly 512 summary entries, which represents
 314  * exactly 2MB segment by default. Not allow to change the basic units.
 315  *
 316  * NOTE: For initializing fields, you must use set_summary
 317  *
 318  * - If data page, nid represents dnode's nid
 319  * - If node page, nid represents the node page's nid.
 320  *
 321  * The ofs_in_node is used by only data page. It represents offset
 322  * from node's page's beginning to get a data block address.
 323  * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
 324  */
 325 #define ENTRIES_IN_SUM          512
 326 #define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
 327 #define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
 328 #define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
 329
 330 /* a summary entry for a 4KB-sized block in a segment */
 331 struct f2fs_summary {
 332         __le32 nid;             /* parent node id */
 333         union {
 334                 __u8 reserved[3];
 335                 struct {
 336                         __u8 version;           /* node version number */
 337                         __le16 ofs_in_node;     /* block index in parent node */
 338                 } __packed;
 339         };
 340 } __packed;
 341
 342 /* summary block type, node or data, is stored to the summary_footer */
 343 #define SUM_TYPE_NODE           (1)
 344 #define SUM_TYPE_DATA           (0)
 345
 346 struct summary_footer {
 347         unsigned char entry_type;       /* SUM_TYPE_XXX */
 348         __le32 check_sum;               /* summary checksum */
 349 } __packed;
 350
 351 #define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
 352                                 SUM_ENTRY_SIZE)
 353 #define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
 354                                 sizeof(struct nat_journal_entry))
 355 #define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
 356                                 sizeof(struct nat_journal_entry))
 357 #define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
 358                                 sizeof(struct sit_journal_entry))
 359 #define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
 360                                 sizeof(struct sit_journal_entry))
 361
 362 /* Reserved area should make size of f2fs_extra_info equals to
 363  * that of nat_journal and sit_journal.
 364  */
 365 #define EXTRA_INFO_RESERVED     (SUM_JOURNAL_SIZE - 2 - 8)
 366
 367 /*
 368  * frequently updated NAT/SIT entries can be stored in the spare area in
 369  * summary blocks
 370  */
 371 enum {
 372         NAT_JOURNAL = 0,
 373         SIT_JOURNAL
 374 };
 375
 376 struct nat_journal_entry {
 377         __le32 nid;
 378         struct f2fs_nat_entry ne;
 379 } __packed;
 380
 381 struct nat_journal {
 382         struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
 383         __u8 reserved[NAT_JOURNAL_RESERVED];
 384 } __packed;
 385
 386 struct sit_journal_entry {
 387         __le32 segno;
 388         struct f2fs_sit_entry se;
 389 } __packed;
 390
 391 struct sit_journal {
 392         struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
 393         __u8 reserved[SIT_JOURNAL_RESERVED];
 394 } __packed;
 395
 396 struct f2fs_extra_info {
 397         __le64 kbytes_written;
 398         __u8 reserved[EXTRA_INFO_RESERVED];
 399 } __packed;
 400
 401 struct f2fs_journal {
 402         union {
 403                 __le16 n_nats;
 404                 __le16 n_sits;
 405         };
 406         /* spare area is used by NAT or SIT journals or extra info */
 407         union {
 408                 struct nat_journal nat_j;
 409                 struct sit_journal sit_j;
 410                 struct f2fs_extra_info info;
 411         };
 412 } __packed;
 413
 414 /* 4KB-sized summary block structure */
 415 struct f2fs_summary_block {
 416         struct f2fs_summary entries[ENTRIES_IN_SUM];
 417         struct f2fs_journal journal;
 418         struct summary_footer footer;
 419 } __packed;
 420
 421 /*
 422  * For directory operations
 423  */
 424 #define F2FS_DOT_HASH           0
 425 #define F2FS_DDOT_HASH          F2FS_DOT_HASH
 426 #define F2FS_MAX_HASH           (~((0x3ULL) << 62))
 427 #define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
 428
 429 typedef __le32  f2fs_hash_t;
 430
 431 /* One directory entry slot covers 8bytes-long file name */
 432 #define F2FS_SLOT_LEN           8
 433 #define F2FS_SLOT_LEN_BITS      3
 434
 435 #define GET_DENTRY_SLOTS(x)     ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
 436
 437 /* MAX level for dir lookup */
 438 #define MAX_DIR_HASH_DEPTH      63
 439
 440 /* MAX buckets in one level of dir */
 441 #define MAX_DIR_BUCKETS         (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
 442
 443 /*
 444  * space utilization of regular dentry and inline dentry
 445  *              regular dentry                  inline dentry
 446  * bitmap       1 * 27 = 27                     1 * 23 = 23
 447  * reserved     1 * 3 = 3                       1 * 7 = 7
 448  * dentry       11 * 214 = 2354                 11 * 182 = 2002
 449  * filename     8 * 214 = 1712                  8 * 182 = 1456
 450  * total        4096                            3488
 451  *
 452  * Note: there are more reserved space in inline dentry than in regular
 453  * dentry, when converting inline dentry we should handle this carefully.
 454  */
 455 #define NR_DENTRY_IN_BLOCK      214     /* the number of dentry in a block */
 456 #define SIZE_OF_DIR_ENTRY       11      /* by byte */
 457 #define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
 458                                         BITS_PER_BYTE)
 459 #define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
 460                                 F2FS_SLOT_LEN) * \
 461                                 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
 462
 463 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
 464 struct f2fs_dir_entry {
 465         __le32 hash_code;       /* hash code of file name */
 466         __le32 ino;             /* inode number */
 467         __le16 name_len;        /* lengh of file name */
 468         __u8 file_type;         /* file type */
 469 } __packed;
 470
 471 /* 4KB-sized directory entry block */
 472 struct f2fs_dentry_block {
 473         /* validity bitmap for directory entries in each block */
 474         __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
 475         __u8 reserved[SIZE_OF_RESERVED];
 476         struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
 477         __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
 478 } __packed;
 479
 480 /* for inline dir */
 481 #define NR_INLINE_DENTRY        (MAX_INLINE_DATA * BITS_PER_BYTE / \
 482                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
 483                                 BITS_PER_BYTE + 1))
 484 #define INLINE_DENTRY_BITMAP_SIZE       ((NR_INLINE_DENTRY + \
 485                                         BITS_PER_BYTE - 1) / BITS_PER_BYTE)
 486 #define INLINE_RESERVED_SIZE    (MAX_INLINE_DATA - \
 487                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
 488                                 NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE))
 489
 490 /* inline directory entry structure */
 491 struct f2fs_inline_dentry {
 492         __u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
 493         __u8 reserved[INLINE_RESERVED_SIZE];
 494         struct f2fs_dir_entry dentry[NR_INLINE_DENTRY];
 495         __u8 filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN];
 496 } __packed;
 497
 498 /* file types used in inode_info->flags */
 499 enum {
 500         F2FS_FT_UNKNOWN,
 501         F2FS_FT_REG_FILE,
 502         F2FS_FT_DIR,
 503         F2FS_FT_CHRDEV,
 504         F2FS_FT_BLKDEV,
 505         F2FS_FT_FIFO,
 506         F2FS_FT_SOCK,
 507         F2FS_FT_SYMLINK,
 508         F2FS_FT_MAX
 509 };
 510
 511 #endif  /* _LINUX_F2FS_FS_H */