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_EXTENSION_LEN 8 /* max size of extension */ 25 #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS) 26 27 #define NULL_ADDR ((block_t)0) /* used as block_t addresses */ 28 #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */ 29 30 #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS) 31 #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS) 32 33 /* 0, 1(node nid), 2(meta nid) are reserved node id */ 34 #define F2FS_RESERVED_NODE_NUM 3 35 36 #define F2FS_ROOT_INO(sbi) ((sbi)->root_ino_num) 37 #define F2FS_NODE_INO(sbi) ((sbi)->node_ino_num) 38 #define F2FS_META_INO(sbi) ((sbi)->meta_ino_num) 39 40 #define F2FS_MAX_QUOTAS 3 41 42 #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ 43 #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */ 44 #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */ 45 #define F2FS_IO_SIZE_BITS(sbi) (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */ 46 #define F2FS_IO_SIZE_MASK(sbi) (F2FS_IO_SIZE(sbi) - 1) 47 48 /* This flag is used by node and meta inodes, and by recovery */ 49 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) 50 51 /* 52 * For further optimization on multi-head logs, on-disk layout supports maximum 53 * 16 logs by default. The number, 16, is expected to cover all the cases 54 * enoughly. The implementaion currently uses no more than 6 logs. 55 * Half the logs are used for nodes, and the other half are used for data. 56 */ 57 #define MAX_ACTIVE_LOGS 16 58 #define MAX_ACTIVE_NODE_LOGS 8 59 #define MAX_ACTIVE_DATA_LOGS 8 60 61 #define VERSION_LEN 256 62 #define MAX_VOLUME_NAME 512 63 #define MAX_PATH_LEN 64 64 #define MAX_DEVICES 8 65 66 /* 67 * For superblock 68 */ 69 struct f2fs_device { 70 __u8 path[MAX_PATH_LEN]; 71 __le32 total_segments; 72 } __packed; 73 74 struct f2fs_super_block { 75 __le32 magic; /* Magic Number */ 76 __le16 major_ver; /* Major Version */ 77 __le16 minor_ver; /* Minor Version */ 78 __le32 log_sectorsize; /* log2 sector size in bytes */ 79 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 80 __le32 log_blocksize; /* log2 block size in bytes */ 81 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 82 __le32 segs_per_sec; /* # of segments per section */ 83 __le32 secs_per_zone; /* # of sections per zone */ 84 __le32 checksum_offset; /* checksum offset inside super block */ 85 __le64 block_count; /* total # of user blocks */ 86 __le32 section_count; /* total # of sections */ 87 __le32 segment_count; /* total # of segments */ 88 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 89 __le32 segment_count_sit; /* # of segments for SIT */ 90 __le32 segment_count_nat; /* # of segments for NAT */ 91 __le32 segment_count_ssa; /* # of segments for SSA */ 92 __le32 segment_count_main; /* # of segments for main area */ 93 __le32 segment0_blkaddr; /* start block address of segment 0 */ 94 __le32 cp_blkaddr; /* start block address of checkpoint */ 95 __le32 sit_blkaddr; /* start block address of SIT */ 96 __le32 nat_blkaddr; /* start block address of NAT */ 97 __le32 ssa_blkaddr; /* start block address of SSA */ 98 __le32 main_blkaddr; /* start block address of main area */ 99 __le32 root_ino; /* root inode number */ 100 __le32 node_ino; /* node inode number */ 101 __le32 meta_ino; /* meta inode number */ 102 __u8 uuid[16]; /* 128-bit uuid for volume */ 103 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ 104 __le32 extension_count; /* # of extensions below */ 105 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ 106 __le32 cp_payload; 107 __u8 version[VERSION_LEN]; /* the kernel version */ 108 __u8 init_version[VERSION_LEN]; /* the initial kernel version */ 109 __le32 feature; /* defined features */ 110 __u8 encryption_level; /* versioning level for encryption */ 111 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 112 struct f2fs_device devs[MAX_DEVICES]; /* device list */ 113 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ 114 __u8 hot_ext_count; /* # of hot file extension */ 115 __u8 reserved[314]; /* valid reserved region */ 116 } __packed; 117 118 /* 119 * For checkpoint 120 */ 121 #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 122 #define CP_NOCRC_RECOVERY_FLAG 0x00000200 123 #define CP_TRIMMED_FLAG 0x00000100 124 #define CP_NAT_BITS_FLAG 0x00000080 125 #define CP_CRC_RECOVERY_FLAG 0x00000040 126 #define CP_FASTBOOT_FLAG 0x00000020 127 #define CP_FSCK_FLAG 0x00000010 128 #define CP_ERROR_FLAG 0x00000008 129 #define CP_COMPACT_SUM_FLAG 0x00000004 130 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 131 #define CP_UMOUNT_FLAG 0x00000001 132 133 #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ 134 135 struct f2fs_checkpoint { 136 __le64 checkpoint_ver; /* checkpoint block version number */ 137 __le64 user_block_count; /* # of user blocks */ 138 __le64 valid_block_count; /* # of valid blocks in main area */ 139 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 140 __le32 overprov_segment_count; /* # of overprovision segments */ 141 __le32 free_segment_count; /* # of free segments in main area */ 142 143 /* information of current node segments */ 144 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 145 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 146 /* information of current data segments */ 147 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 148 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 149 __le32 ckpt_flags; /* Flags : umount and journal_present */ 150 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 151 __le32 cp_pack_start_sum; /* start block number of data summary */ 152 __le32 valid_node_count; /* Total number of valid nodes */ 153 __le32 valid_inode_count; /* Total number of valid inodes */ 154 __le32 next_free_nid; /* Next free node number */ 155 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 156 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 157 __le32 checksum_offset; /* checksum offset inside cp block */ 158 __le64 elapsed_time; /* mounted time */ 159 /* allocation type of current segment */ 160 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 161 162 /* SIT and NAT version bitmap */ 163 unsigned char sit_nat_version_bitmap[1]; 164 } __packed; 165 166 /* 167 * For orphan inode management 168 */ 169 #define F2FS_ORPHANS_PER_BLOCK 1020 170 171 #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ 172 F2FS_ORPHANS_PER_BLOCK) 173 174 struct f2fs_orphan_block { 175 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 176 __le32 reserved; /* reserved */ 177 __le16 blk_addr; /* block index in current CP */ 178 __le16 blk_count; /* Number of orphan inode blocks in CP */ 179 __le32 entry_count; /* Total number of orphan nodes in current CP */ 180 __le32 check_sum; /* CRC32 for orphan inode block */ 181 } __packed; 182 183 /* 184 * For NODE structure 185 */ 186 struct f2fs_extent { 187 __le32 fofs; /* start file offset of the extent */ 188 __le32 blk; /* start block address of the extent */ 189 __le32 len; /* lengh of the extent */ 190 } __packed; 191 192 #define F2FS_NAME_LEN 255 193 /* 200 bytes for inline xattrs by default */ 194 #define DEFAULT_INLINE_XATTR_ADDRS 50 195 #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ 196 #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ 197 get_extra_isize(inode)) 198 #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ 199 #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) 200 #define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ 201 #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ 202 203 #define ADDRS_PER_PAGE(page, inode) \ 204 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK) 205 206 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 207 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 208 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 209 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 210 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 211 212 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 213 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 214 #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ 215 #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ 216 #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ 217 #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ 218 #define F2FS_PIN_FILE 0x40 /* file should not be gced */ 219 220 struct f2fs_inode { 221 __le16 i_mode; /* file mode */ 222 __u8 i_advise; /* file hints */ 223 __u8 i_inline; /* file inline flags */ 224 __le32 i_uid; /* user ID */ 225 __le32 i_gid; /* group ID */ 226 __le32 i_links; /* links count */ 227 __le64 i_size; /* file size in bytes */ 228 __le64 i_blocks; /* file size in blocks */ 229 __le64 i_atime; /* access time */ 230 __le64 i_ctime; /* change time */ 231 __le64 i_mtime; /* modification time */ 232 __le32 i_atime_nsec; /* access time in nano scale */ 233 __le32 i_ctime_nsec; /* change time in nano scale */ 234 __le32 i_mtime_nsec; /* modification time in nano scale */ 235 __le32 i_generation; /* file version (for NFS) */ 236 union { 237 __le32 i_current_depth; /* only for directory depth */ 238 __le16 i_gc_failures; /* 239 * # of gc failures on pinned file. 240 * only for regular files. 241 */ 242 }; 243 __le32 i_xattr_nid; /* nid to save xattr */ 244 __le32 i_flags; /* file attributes */ 245 __le32 i_pino; /* parent inode number */ 246 __le32 i_namelen; /* file name length */ 247 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 248 __u8 i_dir_level; /* dentry_level for large dir */ 249 250 struct f2fs_extent i_ext; /* caching a largest extent */ 251 252 union { 253 struct { 254 __le16 i_extra_isize; /* extra inode attribute size */ 255 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 256 __le32 i_projid; /* project id */ 257 __le32 i_inode_checksum;/* inode meta checksum */ 258 __le64 i_crtime; /* creation time */ 259 __le32 i_crtime_nsec; /* creation time in nano scale */ 260 __le32 i_extra_end[0]; /* for attribute size calculation */ 261 } __packed; 262 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 263 }; 264 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 265 double_indirect(1) node id */ 266 } __packed; 267 268 struct direct_node { 269 __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */ 270 } __packed; 271 272 struct indirect_node { 273 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 274 } __packed; 275 276 enum { 277 COLD_BIT_SHIFT = 0, 278 FSYNC_BIT_SHIFT, 279 DENT_BIT_SHIFT, 280 OFFSET_BIT_SHIFT 281 }; 282 283 #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */ 284 285 struct node_footer { 286 __le32 nid; /* node id */ 287 __le32 ino; /* inode nunmber */ 288 __le32 flag; /* include cold/fsync/dentry marks and offset */ 289 __le64 cp_ver; /* checkpoint version */ 290 __le32 next_blkaddr; /* next node page block address */ 291 } __packed; 292 293 struct f2fs_node { 294 /* can be one of three types: inode, direct, and indirect types */ 295 union { 296 struct f2fs_inode i; 297 struct direct_node dn; 298 struct indirect_node in; 299 }; 300 struct node_footer footer; 301 } __packed; 302 303 /* 304 * For NAT entries 305 */ 306 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry)) 307 308 struct f2fs_nat_entry { 309 __u8 version; /* latest version of cached nat entry */ 310 __le32 ino; /* inode number */ 311 __le32 block_addr; /* block address */ 312 } __packed; 313 314 struct f2fs_nat_block { 315 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 316 } __packed; 317 318 /* 319 * For SIT entries 320 * 321 * Each segment is 2MB in size by default so that a bitmap for validity of 322 * there-in blocks should occupy 64 bytes, 512 bits. 323 * Not allow to change this. 324 */ 325 #define SIT_VBLOCK_MAP_SIZE 64 326 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) 327 328 /* 329 * F2FS uses 4 bytes to represent block address. As a result, supported size of 330 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 331 */ 332 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 333 334 /* 335 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 336 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 337 * [9:0] : valid block count 338 */ 339 #define SIT_VBLOCKS_SHIFT 10 340 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 341 #define GET_SIT_VBLOCKS(raw_sit) \ 342 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 343 #define GET_SIT_TYPE(raw_sit) \ 344 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 345 >> SIT_VBLOCKS_SHIFT) 346 347 struct f2fs_sit_entry { 348 __le16 vblocks; /* reference above */ 349 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 350 __le64 mtime; /* segment age for cleaning */ 351 } __packed; 352 353 struct f2fs_sit_block { 354 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 355 } __packed; 356 357 /* 358 * For segment summary 359 * 360 * One summary block contains exactly 512 summary entries, which represents 361 * exactly 2MB segment by default. Not allow to change the basic units. 362 * 363 * NOTE: For initializing fields, you must use set_summary 364 * 365 * - If data page, nid represents dnode's nid 366 * - If node page, nid represents the node page's nid. 367 * 368 * The ofs_in_node is used by only data page. It represents offset 369 * from node's page's beginning to get a data block address. 370 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 371 */ 372 #define ENTRIES_IN_SUM 512 373 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 374 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 375 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 376 377 /* a summary entry for a 4KB-sized block in a segment */ 378 struct f2fs_summary { 379 __le32 nid; /* parent node id */ 380 union { 381 __u8 reserved[3]; 382 struct { 383 __u8 version; /* node version number */ 384 __le16 ofs_in_node; /* block index in parent node */ 385 } __packed; 386 }; 387 } __packed; 388 389 /* summary block type, node or data, is stored to the summary_footer */ 390 #define SUM_TYPE_NODE (1) 391 #define SUM_TYPE_DATA (0) 392 393 struct summary_footer { 394 unsigned char entry_type; /* SUM_TYPE_XXX */ 395 __le32 check_sum; /* summary checksum */ 396 } __packed; 397 398 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 399 SUM_ENTRY_SIZE) 400 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 401 sizeof(struct nat_journal_entry)) 402 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 403 sizeof(struct nat_journal_entry)) 404 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 405 sizeof(struct sit_journal_entry)) 406 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 407 sizeof(struct sit_journal_entry)) 408 409 /* Reserved area should make size of f2fs_extra_info equals to 410 * that of nat_journal and sit_journal. 411 */ 412 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 413 414 /* 415 * frequently updated NAT/SIT entries can be stored in the spare area in 416 * summary blocks 417 */ 418 enum { 419 NAT_JOURNAL = 0, 420 SIT_JOURNAL 421 }; 422 423 struct nat_journal_entry { 424 __le32 nid; 425 struct f2fs_nat_entry ne; 426 } __packed; 427 428 struct nat_journal { 429 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 430 __u8 reserved[NAT_JOURNAL_RESERVED]; 431 } __packed; 432 433 struct sit_journal_entry { 434 __le32 segno; 435 struct f2fs_sit_entry se; 436 } __packed; 437 438 struct sit_journal { 439 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 440 __u8 reserved[SIT_JOURNAL_RESERVED]; 441 } __packed; 442 443 struct f2fs_extra_info { 444 __le64 kbytes_written; 445 __u8 reserved[EXTRA_INFO_RESERVED]; 446 } __packed; 447 448 struct f2fs_journal { 449 union { 450 __le16 n_nats; 451 __le16 n_sits; 452 }; 453 /* spare area is used by NAT or SIT journals or extra info */ 454 union { 455 struct nat_journal nat_j; 456 struct sit_journal sit_j; 457 struct f2fs_extra_info info; 458 }; 459 } __packed; 460 461 /* 4KB-sized summary block structure */ 462 struct f2fs_summary_block { 463 struct f2fs_summary entries[ENTRIES_IN_SUM]; 464 struct f2fs_journal journal; 465 struct summary_footer footer; 466 } __packed; 467 468 /* 469 * For directory operations 470 */ 471 #define F2FS_DOT_HASH 0 472 #define F2FS_DDOT_HASH F2FS_DOT_HASH 473 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 474 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 475 476 typedef __le32 f2fs_hash_t; 477 478 /* One directory entry slot covers 8bytes-long file name */ 479 #define F2FS_SLOT_LEN 8 480 #define F2FS_SLOT_LEN_BITS 3 481 482 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 483 484 /* MAX level for dir lookup */ 485 #define MAX_DIR_HASH_DEPTH 63 486 487 /* MAX buckets in one level of dir */ 488 #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1)) 489 490 /* 491 * space utilization of regular dentry and inline dentry (w/o extra reservation) 492 * regular dentry inline dentry 493 * bitmap 1 * 27 = 27 1 * 23 = 23 494 * reserved 1 * 3 = 3 1 * 7 = 7 495 * dentry 11 * 214 = 2354 11 * 182 = 2002 496 * filename 8 * 214 = 1712 8 * 182 = 1456 497 * total 4096 3488 498 * 499 * Note: there are more reserved space in inline dentry than in regular 500 * dentry, when converting inline dentry we should handle this carefully. 501 */ 502 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */ 503 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 504 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 505 BITS_PER_BYTE) 506 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 507 F2FS_SLOT_LEN) * \ 508 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 509 510 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 511 struct f2fs_dir_entry { 512 __le32 hash_code; /* hash code of file name */ 513 __le32 ino; /* inode number */ 514 __le16 name_len; /* lengh of file name */ 515 __u8 file_type; /* file type */ 516 } __packed; 517 518 /* 4KB-sized directory entry block */ 519 struct f2fs_dentry_block { 520 /* validity bitmap for directory entries in each block */ 521 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 522 __u8 reserved[SIZE_OF_RESERVED]; 523 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 524 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 525 } __packed; 526 527 /* file types used in inode_info->flags */ 528 enum { 529 F2FS_FT_UNKNOWN, 530 F2FS_FT_REG_FILE, 531 F2FS_FT_DIR, 532 F2FS_FT_CHRDEV, 533 F2FS_FT_BLKDEV, 534 F2FS_FT_FIFO, 535 F2FS_FT_SOCK, 536 F2FS_FT_SYMLINK, 537 F2FS_FT_MAX 538 }; 539 540 #define S_SHIFT 12 541 542 #define F2FS_DEF_PROJID 0 /* default project ID */ 543 544 #endif /* _LINUX_F2FS_FS_H */ 545