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