1 /** 2 * f2fs_fs.h 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * Dual licensed under the GPL or LGPL version 2 licenses. 8 */ 9 #ifndef __F2FS_FS_H__ 10 #define __F2FS_FS_H__ 11 12 #include <inttypes.h> 13 #include <linux/types.h> 14 #include <sys/types.h> 15 16 #ifdef HAVE_CONFIG_H 17 #include <config.h> 18 #endif 19 20 typedef u_int64_t u64; 21 typedef u_int32_t u32; 22 typedef u_int16_t u16; 23 typedef u_int8_t u8; 24 typedef u32 block_t; 25 typedef u32 nid_t; 26 typedef u8 bool; 27 typedef unsigned long pgoff_t; 28 29 #if __BYTE_ORDER == __LITTLE_ENDIAN 30 #define le16_to_cpu(x) ((__u16)(x)) 31 #define le32_to_cpu(x) ((__u32)(x)) 32 #define le64_to_cpu(x) ((__u64)(x)) 33 #define cpu_to_le16(x) ((__u16)(x)) 34 #define cpu_to_le32(x) ((__u32)(x)) 35 #define cpu_to_le64(x) ((__u64)(x)) 36 #elif __BYTE_ORDER == __BIG_ENDIAN 37 #define le16_to_cpu(x) bswap_16(x) 38 #define le32_to_cpu(x) bswap_32(x) 39 #define le64_to_cpu(x) bswap_64(x) 40 #define cpu_to_le16(x) bswap_16(x) 41 #define cpu_to_le32(x) bswap_32(x) 42 #define cpu_to_le64(x) bswap_64(x) 43 #endif 44 45 #define typecheck(type,x) \ 46 ({ type __dummy; \ 47 typeof(x) __dummy2; \ 48 (void)(&__dummy == &__dummy2); \ 49 1; \ 50 }) 51 52 #define NULL_SEGNO ((unsigned int)~0) 53 54 /* 55 * Debugging interfaces 56 */ 57 #define ASSERT_MSG(exp, fmt, ...) \ 58 do { \ 59 if (!(exp)) { \ 60 printf("\nAssertion failed!\n"); \ 61 printf("[%s:%4d] " #exp, __func__, __LINE__); \ 62 printf("\n --> "fmt, ##__VA_ARGS__); \ 63 exit(-1); \ 64 } \ 65 } while (0); 66 67 #define ASSERT(exp) \ 68 do { \ 69 if (!(exp)) { \ 70 printf("\nAssertion failed!\n"); \ 71 printf("[%s:%4d] " #exp"\n", __func__, __LINE__);\ 72 exit(-1); \ 73 } \ 74 } while (0); 75 76 #define ERR_MSG(fmt, ...) \ 77 do { \ 78 printf("[%s:%d] " fmt, __func__, __LINE__, ##__VA_ARGS__); \ 79 } while (0); 80 81 82 #define MSG(n, fmt, ...) \ 83 do { \ 84 if (config.dbg_lv >= n) { \ 85 printf(fmt, ##__VA_ARGS__); \ 86 } \ 87 } while (0); 88 89 #define DBG(n, fmt, ...) \ 90 do { \ 91 if (config.dbg_lv >= n) { \ 92 printf("[%s:%4d] " fmt, \ 93 __func__, __LINE__, ##__VA_ARGS__); \ 94 } \ 95 } while (0); 96 97 /* Display on console */ 98 #define DISP(fmt, ptr, member) \ 99 do { \ 100 printf("%-30s" fmt, #member, ((ptr)->member)); \ 101 } while (0); 102 103 #define DISP_u32(ptr, member) \ 104 do { \ 105 assert(sizeof((ptr)->member) <= 4); \ 106 printf("%-30s" "\t\t[0x%8x : %u]\n", \ 107 #member, ((ptr)->member), ((ptr)->member) ); \ 108 } while (0); 109 110 #define DISP_u64(ptr, member) \ 111 do { \ 112 assert(sizeof((ptr)->member) == 8); \ 113 printf("%-30s" "\t\t[0x%8llx : %llu]\n", \ 114 #member, ((ptr)->member), ((ptr)->member) ); \ 115 } while (0); 116 117 #define DISP_utf(ptr, member) \ 118 do { \ 119 printf("%-30s" "\t\t[%s]\n", #member, ((ptr)->member) ); \ 120 } while (0); 121 122 /* Display to buffer */ 123 #define BUF_DISP_u32(buf, data, len, ptr, member) \ 124 do { \ 125 assert(sizeof((ptr)->member) <= 4); \ 126 snprintf(buf, len, #member); \ 127 snprintf(data, len, "0x%x : %u", ((ptr)->member), ((ptr)->member)); \ 128 } while (0); 129 130 #define BUF_DISP_u64(buf, data, len, ptr, member) \ 131 do { \ 132 assert(sizeof((ptr)->member) == 8); \ 133 snprintf(buf, len, #member); \ 134 snprintf(data, len, "0x%llx : %llu", ((ptr)->member), ((ptr)->member)); \ 135 } while (0); 136 137 #define BUF_DISP_utf(buf, data, len, ptr, member) \ 138 do { \ 139 snprintf(buf, len, #member); \ 140 } while (0); 141 142 /* these are defined in kernel */ 143 #define PAGE_SIZE 4096 144 #define PAGE_CACHE_SIZE 4096 145 #define BITS_PER_BYTE 8 146 #define F2FS_SUPER_MAGIC 0xF2F52010 /* F2FS Magic Number */ 147 #define CHECKSUM_OFFSET 4092 148 149 /* for mkfs */ 150 #define F2FS_MIN_VOLUME_SIZE 104857600 151 #define F2FS_NUMBER_OF_CHECKPOINT_PACK 2 152 #define DEFAULT_SECTOR_SIZE 512 153 #define DEFAULT_SECTORS_PER_BLOCK 8 154 #define DEFAULT_BLOCKS_PER_SEGMENT 512 155 #define DEFAULT_SEGMENTS_PER_SECTION 1 156 157 enum f2fs_config_func { 158 FSCK, 159 DUMP, 160 }; 161 162 struct f2fs_configuration { 163 u_int32_t sector_size; 164 u_int32_t reserved_segments; 165 u_int32_t overprovision; 166 u_int32_t cur_seg[6]; 167 u_int32_t segs_per_sec; 168 u_int32_t secs_per_zone; 169 u_int32_t start_sector; 170 u_int64_t total_sectors; 171 u_int32_t sectors_per_blk; 172 u_int32_t blks_per_seg; 173 char *vol_label; 174 int heap; 175 int32_t fd; 176 char *device_name; 177 char *extension_list; 178 int dbg_lv; 179 int trim; 180 int func; 181 void *private; 182 } __attribute__((packed)); 183 184 #ifdef CONFIG_64BIT 185 #define BITS_PER_LONG 64 186 #else 187 #define BITS_PER_LONG 32 188 #endif 189 190 #define BIT_MASK(nr) (1 << (nr % BITS_PER_LONG)) 191 #define BIT_WORD(nr) (nr / BITS_PER_LONG) 192 193 /* 194 * Copied from fs/f2fs/f2fs.h 195 */ 196 #define NR_CURSEG_DATA_TYPE (3) 197 #define NR_CURSEG_NODE_TYPE (3) 198 #define NR_CURSEG_TYPE (NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE) 199 200 enum { 201 CURSEG_HOT_DATA = 0, /* directory entry blocks */ 202 CURSEG_WARM_DATA, /* data blocks */ 203 CURSEG_COLD_DATA, /* multimedia or GCed data blocks */ 204 CURSEG_HOT_NODE, /* direct node blocks of directory files */ 205 CURSEG_WARM_NODE, /* direct node blocks of normal files */ 206 CURSEG_COLD_NODE, /* indirect node blocks */ 207 NO_CHECK_TYPE 208 }; 209 210 /* 211 * Copied from fs/f2fs/segment.h 212 */ 213 #define GET_SUM_TYPE(footer) ((footer)->entry_type) 214 #define SET_SUM_TYPE(footer, type) ((footer)->entry_type = type) 215 216 /* 217 * Copied from include/linux/f2fs_sb.h 218 */ 219 #define F2FS_SUPER_OFFSET 1024 /* byte-size offset */ 220 #define F2FS_LOG_SECTOR_SIZE 9 /* 9 bits for 512 byte */ 221 #define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */ 222 #define F2FS_BLKSIZE 4096 /* support only 4KB block */ 223 #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ 224 225 #define NULL_ADDR 0x0U 226 #define NEW_ADDR -1U 227 228 #define F2FS_ROOT_INO(sbi) (sbi->root_ino_num) 229 #define F2FS_NODE_INO(sbi) (sbi->node_ino_num) 230 #define F2FS_META_INO(sbi) (sbi->meta_ino_num) 231 232 /* This flag is used by node and meta inodes, and by recovery */ 233 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) 234 235 /* 236 * For further optimization on multi-head logs, on-disk layout supports maximum 237 * 16 logs by default. The number, 16, is expected to cover all the cases 238 * enoughly. The implementaion currently uses no more than 6 logs. 239 * Half the logs are used for nodes, and the other half are used for data. 240 */ 241 #define MAX_ACTIVE_LOGS 16 242 #define MAX_ACTIVE_NODE_LOGS 8 243 #define MAX_ACTIVE_DATA_LOGS 8 244 245 /* 246 * For superblock 247 */ 248 struct f2fs_super_block { 249 __le32 magic; /* Magic Number */ 250 __le16 major_ver; /* Major Version */ 251 __le16 minor_ver; /* Minor Version */ 252 __le32 log_sectorsize; /* log2 sector size in bytes */ 253 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 254 __le32 log_blocksize; /* log2 block size in bytes */ 255 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 256 __le32 segs_per_sec; /* # of segments per section */ 257 __le32 secs_per_zone; /* # of sections per zone */ 258 __le32 checksum_offset; /* checksum offset inside super block */ 259 __le64 block_count; /* total # of user blocks */ 260 __le32 section_count; /* total # of sections */ 261 __le32 segment_count; /* total # of segments */ 262 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 263 __le32 segment_count_sit; /* # of segments for SIT */ 264 __le32 segment_count_nat; /* # of segments for NAT */ 265 __le32 segment_count_ssa; /* # of segments for SSA */ 266 __le32 segment_count_main; /* # of segments for main area */ 267 __le32 segment0_blkaddr; /* start block address of segment 0 */ 268 __le32 cp_blkaddr; /* start block address of checkpoint */ 269 __le32 sit_blkaddr; /* start block address of SIT */ 270 __le32 nat_blkaddr; /* start block address of NAT */ 271 __le32 ssa_blkaddr; /* start block address of SSA */ 272 __le32 main_blkaddr; /* start block address of main area */ 273 __le32 root_ino; /* root inode number */ 274 __le32 node_ino; /* node inode number */ 275 __le32 meta_ino; /* meta inode number */ 276 __u8 uuid[16]; /* 128-bit uuid for volume */ 277 __le16 volume_name[512]; /* volume name */ 278 __le32 extension_count; /* # of extensions below */ 279 __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */ 280 __le32 cp_payload; 281 } __attribute__((packed)); 282 283 /* 284 * For checkpoint 285 */ 286 #define CP_ERROR_FLAG 0x00000008 287 #define CP_COMPACT_SUM_FLAG 0x00000004 288 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 289 #define CP_UMOUNT_FLAG 0x00000001 290 291 struct f2fs_checkpoint { 292 __le64 checkpoint_ver; /* checkpoint block version number */ 293 __le64 user_block_count; /* # of user blocks */ 294 __le64 valid_block_count; /* # of valid blocks in main area */ 295 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 296 __le32 overprov_segment_count; /* # of overprovision segments */ 297 __le32 free_segment_count; /* # of free segments in main area */ 298 299 /* information of current node segments */ 300 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 301 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 302 /* information of current data segments */ 303 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 304 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 305 __le32 ckpt_flags; /* Flags : umount and journal_present */ 306 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 307 __le32 cp_pack_start_sum; /* start block number of data summary */ 308 __le32 valid_node_count; /* Total number of valid nodes */ 309 __le32 valid_inode_count; /* Total number of valid inodes */ 310 __le32 next_free_nid; /* Next free node number */ 311 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 312 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 313 __le32 checksum_offset; /* checksum offset inside cp block */ 314 __le64 elapsed_time; /* mounted time */ 315 /* allocation type of current segment */ 316 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 317 318 /* SIT and NAT version bitmap */ 319 unsigned char sit_nat_version_bitmap[1]; 320 } __attribute__((packed)); 321 322 /* 323 * For orphan inode management 324 */ 325 #define F2FS_ORPHANS_PER_BLOCK 1020 326 327 struct f2fs_orphan_block { 328 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 329 __le32 reserved; /* reserved */ 330 __le16 blk_addr; /* block index in current CP */ 331 __le16 blk_count; /* Number of orphan inode blocks in CP */ 332 __le32 entry_count; /* Total number of orphan nodes in current CP */ 333 __le32 check_sum; /* CRC32 for orphan inode block */ 334 } __attribute__((packed)); 335 336 /* 337 * For NODE structure 338 */ 339 struct f2fs_extent { 340 __le32 fofs; /* start file offset of the extent */ 341 __le32 blk_addr; /* start block address of the extent */ 342 __le32 len; /* lengh of the extent */ 343 } __attribute__((packed)); 344 345 #define F2FS_NAME_LEN 255 346 #define F2FS_INLINE_XATTR_ADDRS 50 /* 200 bytes for inline xattrs */ 347 #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ 348 #define ADDRS_PER_INODE(fi) addrs_per_inode(fi) 349 #define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ 350 #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ 351 352 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 353 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 354 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 355 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 356 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 357 358 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 359 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 360 #define MAX_INLINE_DATA (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \ 361 F2FS_INLINE_XATTR_ADDRS - 1)) 362 363 #define INLINE_DATA_OFFSET (PAGE_CACHE_SIZE - sizeof(struct node_footer) \ 364 - sizeof(__le32)*(DEF_ADDRS_PER_INODE + 5 - 1)) 365 366 #define DEF_DIR_LEVEL 0 367 368 struct f2fs_inode { 369 __le16 i_mode; /* file mode */ 370 __u8 i_advise; /* file hints */ 371 __u8 i_inline; /* file inline flags */ 372 __le32 i_uid; /* user ID */ 373 __le32 i_gid; /* group ID */ 374 __le32 i_links; /* links count */ 375 __le64 i_size; /* file size in bytes */ 376 __le64 i_blocks; /* file size in blocks */ 377 __le64 i_atime; /* access time */ 378 __le64 i_ctime; /* change time */ 379 __le64 i_mtime; /* modification time */ 380 __le32 i_atime_nsec; /* access time in nano scale */ 381 __le32 i_ctime_nsec; /* change time in nano scale */ 382 __le32 i_mtime_nsec; /* modification time in nano scale */ 383 __le32 i_generation; /* file version (for NFS) */ 384 __le32 i_current_depth; /* only for directory depth */ 385 __le32 i_xattr_nid; /* nid to save xattr */ 386 __le32 i_flags; /* file attributes */ 387 __le32 i_pino; /* parent inode number */ 388 __le32 i_namelen; /* file name length */ 389 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 390 __u8 i_dir_level; /* dentry_level for large dir */ 391 392 struct f2fs_extent i_ext; /* caching a largest extent */ 393 394 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 395 396 __le32 i_nid[5]; /* direct(2), indirect(2), 397 double_indirect(1) node id */ 398 } __attribute__((packed)); 399 400 struct direct_node { 401 __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */ 402 } __attribute__((packed)); 403 404 struct indirect_node { 405 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 406 } __attribute__((packed)); 407 408 enum { 409 COLD_BIT_SHIFT = 0, 410 FSYNC_BIT_SHIFT, 411 DENT_BIT_SHIFT, 412 OFFSET_BIT_SHIFT 413 }; 414 415 struct node_footer { 416 __le32 nid; /* node id */ 417 __le32 ino; /* inode nunmber */ 418 __le32 flag; /* include cold/fsync/dentry marks and offset */ 419 __le64 cp_ver; /* checkpoint version */ 420 __le32 next_blkaddr; /* next node page block address */ 421 } __attribute__((packed)); 422 423 struct f2fs_node { 424 /* can be one of three types: inode, direct, and indirect types */ 425 union { 426 struct f2fs_inode i; 427 struct direct_node dn; 428 struct indirect_node in; 429 }; 430 struct node_footer footer; 431 } __attribute__((packed)); 432 433 /* 434 * For NAT entries 435 */ 436 #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry)) 437 438 struct f2fs_nat_entry { 439 __u8 version; /* latest version of cached nat entry */ 440 __le32 ino; /* inode number */ 441 __le32 block_addr; /* block address */ 442 } __attribute__((packed)); 443 444 struct f2fs_nat_block { 445 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 446 } __attribute__((packed)); 447 448 /* 449 * For SIT entries 450 * 451 * Each segment is 2MB in size by default so that a bitmap for validity of 452 * there-in blocks should occupy 64 bytes, 512 bits. 453 * Not allow to change this. 454 */ 455 #define SIT_VBLOCK_MAP_SIZE 64 456 #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry)) 457 458 /* 459 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 460 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 461 * [9:0] : valid block count 462 */ 463 #define SIT_VBLOCKS_SHIFT 10 464 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 465 #define GET_SIT_VBLOCKS(raw_sit) \ 466 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 467 #define GET_SIT_TYPE(raw_sit) \ 468 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 469 >> SIT_VBLOCKS_SHIFT) 470 471 struct f2fs_sit_entry { 472 __le16 vblocks; /* reference above */ 473 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 474 __le64 mtime; /* segment age for cleaning */ 475 } __attribute__((packed)); 476 477 struct f2fs_sit_block { 478 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 479 } __attribute__((packed)); 480 481 /* 482 * For segment summary 483 * 484 * One summary block contains exactly 512 summary entries, which represents 485 * exactly 2MB segment by default. Not allow to change the basic units. 486 * 487 * NOTE: For initializing fields, you must use set_summary 488 * 489 * - If data page, nid represents dnode's nid 490 * - If node page, nid represents the node page's nid. 491 * 492 * The ofs_in_node is used by only data page. It represents offset 493 * from node's page's beginning to get a data block address. 494 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 495 */ 496 #define ENTRIES_IN_SUM 512 497 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 498 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 499 #define SUM_ENTRIES_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 500 501 /* a summary entry for a 4KB-sized block in a segment */ 502 struct f2fs_summary { 503 __le32 nid; /* parent node id */ 504 union { 505 __u8 reserved[3]; 506 struct { 507 __u8 version; /* node version number */ 508 __le16 ofs_in_node; /* block index in parent node */ 509 } __attribute__((packed)); 510 }; 511 } __attribute__((packed)); 512 513 /* summary block type, node or data, is stored to the summary_footer */ 514 #define SUM_TYPE_NODE (1) 515 #define SUM_TYPE_DATA (0) 516 517 struct summary_footer { 518 unsigned char entry_type; /* SUM_TYPE_XXX */ 519 __u32 check_sum; /* summary checksum */ 520 } __attribute__((packed)); 521 522 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 523 SUM_ENTRIES_SIZE) 524 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 525 sizeof(struct nat_journal_entry)) 526 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 527 sizeof(struct nat_journal_entry)) 528 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 529 sizeof(struct sit_journal_entry)) 530 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 531 sizeof(struct sit_journal_entry)) 532 /* 533 * frequently updated NAT/SIT entries can be stored in the spare area in 534 * summary blocks 535 */ 536 enum { 537 NAT_JOURNAL = 0, 538 SIT_JOURNAL 539 }; 540 541 struct nat_journal_entry { 542 __le32 nid; 543 struct f2fs_nat_entry ne; 544 } __attribute__((packed)); 545 546 struct nat_journal { 547 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 548 __u8 reserved[NAT_JOURNAL_RESERVED]; 549 } __attribute__((packed)); 550 551 struct sit_journal_entry { 552 __le32 segno; 553 struct f2fs_sit_entry se; 554 } __attribute__((packed)); 555 556 struct sit_journal { 557 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 558 __u8 reserved[SIT_JOURNAL_RESERVED]; 559 } __attribute__((packed)); 560 561 /* 4KB-sized summary block structure */ 562 struct f2fs_summary_block { 563 struct f2fs_summary entries[ENTRIES_IN_SUM]; 564 union { 565 __le16 n_nats; 566 __le16 n_sits; 567 }; 568 /* spare area is used by NAT or SIT journals */ 569 union { 570 struct nat_journal nat_j; 571 struct sit_journal sit_j; 572 }; 573 struct summary_footer footer; 574 } __attribute__((packed)); 575 576 /* 577 * For directory operations 578 */ 579 #define F2FS_DOT_HASH 0 580 #define F2FS_DDOT_HASH F2FS_DOT_HASH 581 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 582 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 583 584 typedef __le32 f2fs_hash_t; 585 586 /* One directory entry slot covers 8bytes-long file name */ 587 #define F2FS_SLOT_LEN 8 588 #define F2FS_SLOT_LEN_BITS 3 589 590 #define GET_DENTRY_SLOTS(x) ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 591 592 /* the number of dentry in a block */ 593 #define NR_DENTRY_IN_BLOCK 214 594 595 /* MAX level for dir lookup */ 596 #define MAX_DIR_HASH_DEPTH 63 597 598 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 599 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 600 BITS_PER_BYTE) 601 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 602 F2FS_SLOT_LEN) * \ 603 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 604 605 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 606 struct f2fs_dir_entry { 607 __le32 hash_code; /* hash code of file name */ 608 __le32 ino; /* inode number */ 609 __le16 name_len; /* lengh of file name */ 610 __u8 file_type; /* file type */ 611 } __attribute__((packed)); 612 613 /* 4KB-sized directory entry block */ 614 struct f2fs_dentry_block { 615 /* validity bitmap for directory entries in each block */ 616 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 617 __u8 reserved[SIZE_OF_RESERVED]; 618 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 619 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 620 } __attribute__((packed)); 621 622 /* file types used in inode_info->flags */ 623 enum FILE_TYPE { 624 F2FS_FT_UNKNOWN, 625 F2FS_FT_REG_FILE, 626 F2FS_FT_DIR, 627 F2FS_FT_CHRDEV, 628 F2FS_FT_BLKDEV, 629 F2FS_FT_FIFO, 630 F2FS_FT_SOCK, 631 F2FS_FT_SYMLINK, 632 F2FS_FT_MAX, 633 /* added for fsck */ 634 F2FS_FT_ORPHAN, 635 }; 636 637 /* from f2fs/segment.h */ 638 enum { 639 LFS = 0, 640 SSR 641 }; 642 643 extern void ASCIIToUNICODE(u_int16_t *, u_int8_t *); 644 extern int log_base_2(u_int32_t); 645 extern unsigned int addrs_per_inode(struct f2fs_inode *); 646 647 extern int get_bits_in_byte(unsigned char n); 648 extern int set_bit(unsigned int nr,void * addr); 649 extern int clear_bit(unsigned int nr, void * addr); 650 extern int test_bit(unsigned int nr, const void * addr); 651 extern int f2fs_test_bit(unsigned int, const char *); 652 extern int f2fs_set_bit(unsigned int, char *); 653 extern int f2fs_clear_bit(unsigned int, char *); 654 extern unsigned long find_next_bit(const unsigned long *, unsigned long, unsigned long); 655 656 extern u_int32_t f2fs_cal_crc32(u_int32_t, void *, int); 657 extern int f2fs_crc_valid(u_int32_t blk_crc, void *buf, int len); 658 659 extern void f2fs_init_configuration(struct f2fs_configuration *); 660 extern int f2fs_dev_is_umounted(struct f2fs_configuration *); 661 extern int f2fs_get_device_info(struct f2fs_configuration *); 662 extern void f2fs_finalize_device(struct f2fs_configuration *); 663 664 extern int dev_read(void *, __u64, size_t); 665 extern int dev_write(void *, __u64, size_t); 666 /* All bytes in the buffer must be 0 use dev_fill(). */ 667 extern int dev_fill(void *, __u64, size_t); 668 669 extern int dev_read_block(void *, __u64); 670 extern int dev_read_blocks(void *, __u64, __u32 ); 671 672 f2fs_hash_t f2fs_dentry_hash(const char *, int); 673 674 extern struct f2fs_configuration config; 675 676 #endif /*__F2FS_FS_H */ 677