LXR linux/include/linux/f2fs

   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)
  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
  55/*
  56 * For superblock
  57 */
  58struct f2fs_super_block {
  59        __le32 magic;                   /* Magic Number */
  60        __le16 major_ver;               /* Major Version */
  61        __le16 minor_ver;               /* Minor Version */
  62        __le32 log_sectorsize;          /* log2 sector size in bytes */
  63        __le32 log_sectors_per_block;   /* log2 # of sectors per block */
  64        __le32 log_blocksize;           /* log2 block size in bytes */
  65        __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
  66        __le32 segs_per_sec;            /* # of segments per section */
  67        __le32 secs_per_zone;           /* # of sections per zone */
  68        __le32 checksum_offset;         /* checksum offset inside super block */
  69        __le64 block_count;             /* total # of user blocks */
  70        __le32 section_count;           /* total # of sections */
  71        __le32 segment_count;           /* total # of segments */
  72        __le32 segment_count_ckpt;      /* # of segments for checkpoint */
  73        __le32 segment_count_sit;       /* # of segments for SIT */
  74        __le32 segment_count_nat;       /* # of segments for NAT */
  75        __le32 segment_count_ssa;       /* # of segments for SSA */
  76        __le32 segment_count_main;      /* # of segments for main area */
  77        __le32 segment0_blkaddr;        /* start block address of segment 0 */
  78        __le32 cp_blkaddr;              /* start block address of checkpoint */
  79        __le32 sit_blkaddr;             /* start block address of SIT */
  80        __le32 nat_blkaddr;             /* start block address of NAT */
  81        __le32 ssa_blkaddr;             /* start block address of SSA */
  82        __le32 main_blkaddr;            /* start block address of main area */
  83        __le32 root_ino;                /* root inode number */
  84        __le32 node_ino;                /* node inode number */
  85        __le32 meta_ino;                /* meta inode number */
  86        __u8 uuid[16];                  /* 128-bit uuid for volume */
  87        __le16 volume_name[512];        /* volume name */
  88        __le32 extension_count;         /* # of extensions below */
  89        __u8 extension_list[F2FS_MAX_EXTENSION][8];     /* extension array */
  90        __le32 cp_payload;
  91        __u8 version[VERSION_LEN];      /* the kernel version */
  92        __u8 init_version[VERSION_LEN]; /* the initial kernel version */
  93        __le32 feature;                 /* defined features */
  94        __u8 encryption_level;          /* versioning level for encryption */
  95        __u8 encrypt_pw_salt[16];       /* Salt used for string2key algorithm */
  96        __u8 reserved[871];             /* valid reserved region */
  97} __packed;
  98
  99/*
 100 * For checkpoint
 101 */
 102#define CP_FASTBOOT_FLAG        0x00000020
 103#define CP_FSCK_FLAG            0x00000010
 104#define CP_ERROR_FLAG           0x00000008
 105#define CP_COMPACT_SUM_FLAG     0x00000004
 106#define CP_ORPHAN_PRESENT_FLAG  0x00000002
 107#define CP_UMOUNT_FLAG          0x00000001
 108
 109#define F2FS_CP_PACKS           2       /* # of checkpoint packs */
 110
 111struct f2fs_checkpoint {
 112        __le64 checkpoint_ver;          /* checkpoint block version number */
 113        __le64 user_block_count;        /* # of user blocks */
 114        __le64 valid_block_count;       /* # of valid blocks in main area */
 115        __le32 rsvd_segment_count;      /* # of reserved segments for gc */
 116        __le32 overprov_segment_count;  /* # of overprovision segments */
 117        __le32 free_segment_count;      /* # of free segments in main area */
 118
 119        /* information of current node segments */
 120        __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
 121        __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
 122        /* information of current data segments */
 123        __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
 124        __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
 125        __le32 ckpt_flags;              /* Flags : umount and journal_present */
 126        __le32 cp_pack_total_block_count;       /* total # of one cp pack */
 127        __le32 cp_pack_start_sum;       /* start block number of data summary */
 128        __le32 valid_node_count;        /* Total number of valid nodes */
 129        __le32 valid_inode_count;       /* Total number of valid inodes */
 130        __le32 next_free_nid;           /* Next free node number */
 131        __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
 132        __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
 133        __le32 checksum_offset;         /* checksum offset inside cp block */
 134        __le64 elapsed_time;            /* mounted time */
 135        /* allocation type of current segment */
 136        unsigned char alloc_type[MAX_ACTIVE_LOGS];
 137
 138        /* SIT and NAT version bitmap */
 139        unsigned char sit_nat_version_bitmap[1];
 140} __packed;
 141
 142/*
 143 * For orphan inode management
 144 */
 145#define F2FS_ORPHANS_PER_BLOCK  1020
 146
 147#define GET_ORPHAN_BLOCKS(n)    ((n + F2FS_ORPHANS_PER_BLOCK - 1) / \
 148                                        F2FS_ORPHANS_PER_BLOCK)
 149
 150struct f2fs_orphan_block {
 151        __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
 152        __le32 reserved;        /* reserved */
 153        __le16 blk_addr;        /* block index in current CP */
 154        __le16 blk_count;       /* Number of orphan inode blocks in CP */
 155        __le32 entry_count;     /* Total number of orphan nodes in current CP */
 156        __le32 check_sum;       /* CRC32 for orphan inode block */
 157} __packed;
 158
 159/*
 160 * For NODE structure
 161 */
 162struct f2fs_extent {
 163        __le32 fofs;            /* start file offset of the extent */
 164        __le32 blk;             /* start block address of the extent */
 165        __le32 len;             /* lengh of the extent */
 166} __packed;
 167
 168#define F2FS_NAME_LEN           255
 169#define F2FS_INLINE_XATTR_ADDRS 50      /* 200 bytes for inline xattrs */
 170#define DEF_ADDRS_PER_INODE     923     /* Address Pointers in an Inode */
 171#define DEF_NIDS_PER_INODE      5       /* Node IDs in an Inode */
 172#define ADDRS_PER_INODE(fi)     addrs_per_inode(fi)
 173#define ADDRS_PER_BLOCK         1018    /* Address Pointers in a Direct Block */
 174#define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
 175
 176#define ADDRS_PER_PAGE(page, fi)        \
 177        (IS_INODE(page) ? ADDRS_PER_INODE(fi) : ADDRS_PER_BLOCK)
 178
 179#define NODE_DIR1_BLOCK         (DEF_ADDRS_PER_INODE + 1)
 180#define NODE_DIR2_BLOCK         (DEF_ADDRS_PER_INODE + 2)
 181#define NODE_IND1_BLOCK         (DEF_ADDRS_PER_INODE + 3)
 182#define NODE_IND2_BLOCK         (DEF_ADDRS_PER_INODE + 4)
 183#define NODE_DIND_BLOCK         (DEF_ADDRS_PER_INODE + 5)
 184
 185#define F2FS_INLINE_XATTR       0x01    /* file inline xattr flag */
 186#define F2FS_INLINE_DATA        0x02    /* file inline data flag */
 187#define F2FS_INLINE_DENTRY      0x04    /* file inline dentry flag */
 188#define F2FS_DATA_EXIST         0x08    /* file inline data exist flag */
 189#define F2FS_INLINE_DOTS        0x10    /* file having implicit dot dentries */
 190
 191#define MAX_INLINE_DATA         (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
 192                                                F2FS_INLINE_XATTR_ADDRS - 1))
 193
 194struct f2fs_inode {
 195        __le16 i_mode;                  /* file mode */
 196        __u8 i_advise;                  /* file hints */
 197        __u8 i_inline;                  /* file inline flags */
 198        __le32 i_uid;                   /* user ID */
 199        __le32 i_gid;                   /* group ID */
 200        __le32 i_links;                 /* links count */
 201        __le64 i_size;                  /* file size in bytes */
 202        __le64 i_blocks;                /* file size in blocks */
 203        __le64 i_atime;                 /* access time */
 204        __le64 i_ctime;                 /* change time */
 205        __le64 i_mtime;                 /* modification time */
 206        __le32 i_atime_nsec;            /* access time in nano scale */
 207        __le32 i_ctime_nsec;            /* change time in nano scale */
 208        __le32 i_mtime_nsec;            /* modification time in nano scale */
 209        __le32 i_generation;            /* file version (for NFS) */
 210        __le32 i_current_depth;         /* only for directory depth */
 211        __le32 i_xattr_nid;             /* nid to save xattr */
 212        __le32 i_flags;                 /* file attributes */
 213        __le32 i_pino;                  /* parent inode number */
 214        __le32 i_namelen;               /* file name length */
 215        __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
 216        __u8 i_dir_level;               /* dentry_level for large dir */
 217
 218        struct f2fs_extent i_ext;       /* caching a largest extent */
 219
 220        __le32 i_addr[DEF_ADDRS_PER_INODE];     /* Pointers to data blocks */
 221
 222        __le32 i_nid[DEF_NIDS_PER_INODE];       /* direct(2), indirect(2),
 223                                                double_indirect(1) node id */
 224} __packed;
 225
 226struct direct_node {
 227        __le32 addr[ADDRS_PER_BLOCK];   /* array of data block address */
 228} __packed;
 229
 230struct indirect_node {
 231        __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
 232} __packed;
 233
 234enum {
 235        COLD_BIT_SHIFT = 0,
 236        FSYNC_BIT_SHIFT,
 237        DENT_BIT_SHIFT,
 238        OFFSET_BIT_SHIFT
 239};
 240
 241#define OFFSET_BIT_MASK         (0x07)  /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
 242
 243struct node_footer {
 244        __le32 nid;             /* node id */
 245        __le32 ino;             /* inode nunmber */
 246        __le32 flag;            /* include cold/fsync/dentry marks and offset */
 247        __le64 cp_ver;          /* checkpoint version */
 248        __le32 next_blkaddr;    /* next node page block address */
 249} __packed;
 250
 251struct f2fs_node {
 252        /* can be one of three types: inode, direct, and indirect types */
 253        union {
 254                struct f2fs_inode i;
 255                struct direct_node dn;
 256                struct indirect_node in;
 257        };
 258        struct node_footer footer;
 259} __packed;
 260
 261/*
 262 * For NAT entries
 263 */
 264#define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
 265
 266struct f2fs_nat_entry {
 267        __u8 version;           /* latest version of cached nat entry */
 268        __le32 ino;             /* inode number */
 269        __le32 block_addr;      /* block address */
 270} __packed;
 271
 272struct f2fs_nat_block {
 273        struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
 274} __packed;
 275
 276/*
 277 * For SIT entries
 278 *
 279 * Each segment is 2MB in size by default so that a bitmap for validity of
 280 * there-in blocks should occupy 64 bytes, 512 bits.
 281 * Not allow to change this.
 282 */
 283#define SIT_VBLOCK_MAP_SIZE 64
 284#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
 285
 286/*
 287 * Note that f2fs_sit_entry->vblocks has the following bit-field information.
 288 * [15:10] : allocation type such as CURSEG_XXXX_TYPE
 289 * [9:0] : valid block count
 290 */
 291#define SIT_VBLOCKS_SHIFT       10
 292#define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
 293#define GET_SIT_VBLOCKS(raw_sit)                                \
 294        (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
 295#define GET_SIT_TYPE(raw_sit)                                   \
 296        ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
 297         >> SIT_VBLOCKS_SHIFT)
 298
 299struct f2fs_sit_entry {
 300        __le16 vblocks;                         /* reference above */
 301        __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
 302        __le64 mtime;                           /* segment age for cleaning */
 303} __packed;
 304
 305struct f2fs_sit_block {
 306        struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
 307} __packed;
 308
 309/*
 310 * For segment summary
 311 *
 312 * One summary block contains exactly 512 summary entries, which represents
 313 * exactly 2MB segment by default. Not allow to change the basic units.
 314 *
 315 * NOTE: For initializing fields, you must use set_summary
 316 *
 317 * - If data page, nid represents dnode's nid
 318 * - If node page, nid represents the node page's nid.
 319 *
 320 * The ofs_in_node is used by only data page. It represents offset
 321 * from node's page's beginning to get a data block address.
 322 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
 323 */
 324#define ENTRIES_IN_SUM          512
 325#define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
 326#define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
 327#define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
 328
 329/* a summary entry for a 4KB-sized block in a segment */
 330struct f2fs_summary {
 331        __le32 nid;             /* parent node id */
 332        union {
 333                __u8 reserved[3];
 334                struct {
 335                        __u8 version;           /* node version number */
 336                        __le16 ofs_in_node;     /* block index in parent node */
 337                } __packed;
 338        };
 339} __packed;
 340
 341/* summary block type, node or data, is stored to the summary_footer */
 342#define SUM_TYPE_NODE           (1)
 343#define SUM_TYPE_DATA           (0)
 344
 345struct summary_footer {
 346        unsigned char entry_type;       /* SUM_TYPE_XXX */
 347        __u32 check_sum;                /* summary checksum */
 348} __packed;
 349
 350#define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
 351                                SUM_ENTRY_SIZE)
 352#define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
 353                                sizeof(struct nat_journal_entry))
 354#define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
 355                                sizeof(struct nat_journal_entry))
 356#define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
 357                                sizeof(struct sit_journal_entry))
 358#define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
 359                                sizeof(struct sit_journal_entry))
 360/*
 361 * frequently updated NAT/SIT entries can be stored in the spare area in
 362 * summary blocks
 363 */
 364enum {
 365        NAT_JOURNAL = 0,
 366        SIT_JOURNAL
 367};
 368
 369struct nat_journal_entry {
 370        __le32 nid;
 371        struct f2fs_nat_entry ne;
 372} __packed;
 373
 374struct nat_journal {
 375        struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
 376        __u8 reserved[NAT_JOURNAL_RESERVED];
 377} __packed;
 378
 379struct sit_journal_entry {
 380        __le32 segno;
 381        struct f2fs_sit_entry se;
 382} __packed;
 383
 384struct sit_journal {
 385        struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
 386        __u8 reserved[SIT_JOURNAL_RESERVED];
 387} __packed;
 388
 389/* 4KB-sized summary block structure */
 390struct f2fs_summary_block {
 391        struct f2fs_summary entries[ENTRIES_IN_SUM];
 392        union {
 393                __le16 n_nats;
 394                __le16 n_sits;
 395        };
 396        /* spare area is used by NAT or SIT journals */
 397        union {
 398                struct nat_journal nat_j;
 399                struct sit_journal sit_j;
 400        };
 401        struct summary_footer footer;
 402} __packed;
 403
 404/*
 405 * For directory operations
 406 */
 407#define F2FS_DOT_HASH           0
 408#define F2FS_DDOT_HASH          F2FS_DOT_HASH
 409#define F2FS_MAX_HASH           (~((0x3ULL) << 62))
 410#define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
 411
 412typedef __le32  f2fs_hash_t;
 413
 414/* One directory entry slot covers 8bytes-long file name */
 415#define F2FS_SLOT_LEN           8
 416#define F2FS_SLOT_LEN_BITS      3
 417
 418#define GET_DENTRY_SLOTS(x)     ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
 419
 420/* MAX level for dir lookup */
 421#define MAX_DIR_HASH_DEPTH      63
 422
 423/* MAX buckets in one level of dir */
 424#define MAX_DIR_BUCKETS         (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
 425
 426/*
 427 * space utilization of regular dentry and inline dentry
 428 *              regular dentry                  inline dentry
 429 * bitmap       1 * 27 = 27                     1 * 23 = 23
 430 * reserved     1 * 3 = 3                       1 * 7 = 7
 431 * dentry       11 * 214 = 2354                 11 * 182 = 2002
 432 * filename     8 * 214 = 1712                  8 * 182 = 1456
 433 * total        4096                            3488
 434 *
 435 * Note: there are more reserved space in inline dentry than in regular
 436 * dentry, when converting inline dentry we should handle this carefully.
 437 */
 438#define NR_DENTRY_IN_BLOCK      214     /* the number of dentry in a block */
 439#define SIZE_OF_DIR_ENTRY       11      /* by byte */
 440#define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
 441                                        BITS_PER_BYTE)
 442#define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
 443                                F2FS_SLOT_LEN) * \
 444                                NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
 445
 446/* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
 447struct f2fs_dir_entry {
 448        __le32 hash_code;       /* hash code of file name */
 449        __le32 ino;             /* inode number */
 450        __le16 name_len;        /* lengh of file name */
 451        __u8 file_type;         /* file type */
 452} __packed;
 453
 454/* 4KB-sized directory entry block */
 455struct f2fs_dentry_block {
 456        /* validity bitmap for directory entries in each block */
 457        __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
 458        __u8 reserved[SIZE_OF_RESERVED];
 459        struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
 460        __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
 461} __packed;
 462
 463/* for inline dir */
 464#define NR_INLINE_DENTRY        (MAX_INLINE_DATA * BITS_PER_BYTE / \
 465                                ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
 466                                BITS_PER_BYTE + 1))
 467#define INLINE_DENTRY_BITMAP_SIZE       ((NR_INLINE_DENTRY + \
 468                                        BITS_PER_BYTE - 1) / BITS_PER_BYTE)
 469#define INLINE_RESERVED_SIZE    (MAX_INLINE_DATA - \
 470                                ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
 471                                NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE))
 472
 473/* inline directory entry structure */
 474struct f2fs_inline_dentry {
 475        __u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
 476        __u8 reserved[INLINE_RESERVED_SIZE];
 477        struct f2fs_dir_entry dentry[NR_INLINE_DENTRY];
 478        __u8 filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN];
 479} __packed;
 480
 481/* file types used in inode_info->flags */
 482enum {
 483        F2FS_FT_UNKNOWN,
 484        F2FS_FT_REG_FILE,
 485        F2FS_FT_DIR,
 486        F2FS_FT_CHRDEV,
 487        F2FS_FT_BLKDEV,
 488        F2FS_FT_FIFO,
 489        F2FS_FT_SOCK,
 490        F2FS_FT_SYMLINK,
 491        F2FS_FT_MAX
 492};
 493
 494#endif  /* _LINUX_F2FS_FS_H */
 495