f2fs_fs.h revision cd1e4704d0cbf1cbb49b3f33c576566b4b1e296e
1/** 2 * 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 __F2FS_FS_H__ 12#define __F2FS_FS_H__ 13 14#include <inttypes.h> 15#include <linux/types.h> 16#include <sys/types.h> 17#include <endian.h> 18#include <byteswap.h> 19 20#ifdef HAVE_CONFIG_H 21#include <config.h> 22#endif 23 24typedef u_int64_t u64; 25typedef u_int32_t u32; 26typedef u_int16_t u16; 27typedef u_int8_t u8; 28typedef u64 block_t; 29typedef u32 nid_t; 30typedef u8 bool; 31typedef unsigned long pgoff_t; 32 33#if __BYTE_ORDER == __LITTLE_ENDIAN 34#define le16_to_cpu(x) ((__u16)(x)) 35#define le32_to_cpu(x) ((__u32)(x)) 36#define le64_to_cpu(x) ((__u64)(x)) 37#define cpu_to_le16(x) ((__u16)(x)) 38#define cpu_to_le32(x) ((__u32)(x)) 39#define cpu_to_le64(x) ((__u64)(x)) 40#elif __BYTE_ORDER == __BIG_ENDIAN 41#define le16_to_cpu(x) bswap_16(x) 42#define le32_to_cpu(x) bswap_32(x) 43#define le64_to_cpu(x) bswap_64(x) 44#define cpu_to_le16(x) bswap_16(x) 45#define cpu_to_le32(x) bswap_32(x) 46#define cpu_to_le64(x) bswap_64(x) 47#endif 48 49#define typecheck(type,x) \ 50 ({ type __dummy; \ 51 typeof(x) __dummy2; \ 52 (void)(&__dummy == &__dummy2); \ 53 1; \ 54 }) 55 56#define NULL_SEGNO ((unsigned int)~0) 57 58/* 59 * Debugging interfaces 60 */ 61#define ASSERT_MSG(exp, fmt, ...) \ 62 do { \ 63 if (!(exp)) { \ 64 printf("\nAssertion failed!\n"); \ 65 printf("[%s:%4d] " #exp, __func__, __LINE__); \ 66 printf("\n --> "fmt, ##__VA_ARGS__); \ 67 exit(-1); \ 68 } \ 69 } while (0); 70 71#define ASSERT(exp) \ 72 do { \ 73 if (!(exp)) { \ 74 printf("\nAssertion failed!\n"); \ 75 printf("[%s:%4d] " #exp"\n", __func__, __LINE__);\ 76 exit(-1); \ 77 } \ 78 } while (0); 79 80#define ERR_MSG(fmt, ...) \ 81 do { \ 82 printf("[%s:%d] " fmt, __func__, __LINE__, ##__VA_ARGS__); \ 83 } while (0); 84 85 86#define MSG(n, fmt, ...) \ 87 do { \ 88 if (config.dbg_lv >= n) { \ 89 printf(fmt, ##__VA_ARGS__); \ 90 } \ 91 } while (0); 92 93#define DBG(n, fmt, ...) \ 94 do { \ 95 if (config.dbg_lv >= n) { \ 96 printf("[%s:%4d] " fmt, \ 97 __func__, __LINE__, ##__VA_ARGS__); \ 98 } \ 99 } while (0); 100 101/* Display on console */ 102#define DISP(fmt, ptr, member) \ 103 do { \ 104 printf("%-30s" fmt, #member, ((ptr)->member)); \ 105 } while (0); 106 107#define DISP_u32(ptr, member) \ 108 do { \ 109 assert(sizeof((ptr)->member) <= 4); \ 110 printf("%-30s" "\t\t[0x%8x : %u]\n", \ 111 #member, ((ptr)->member), ((ptr)->member) ); \ 112 } while (0); 113 114#define DISP_u64(ptr, member) \ 115 do { \ 116 assert(sizeof((ptr)->member) == 8); \ 117 printf("%-30s" "\t\t[0x%8llx : %llu]\n", \ 118 #member, ((ptr)->member), ((ptr)->member) ); \ 119 } while (0); 120 121#define DISP_utf(ptr, member) \ 122 do { \ 123 printf("%-30s" "\t\t[%s]\n", #member, ((ptr)->member) ); \ 124 } while (0); 125 126/* Display to buffer */ 127#define BUF_DISP_u32(buf, data, len, ptr, member) \ 128 do { \ 129 assert(sizeof((ptr)->member) <= 4); \ 130 snprintf(buf, len, #member); \ 131 snprintf(data, len, "0x%x : %u", ((ptr)->member), ((ptr)->member)); \ 132 } while (0); 133 134#define BUF_DISP_u64(buf, data, len, ptr, member) \ 135 do { \ 136 assert(sizeof((ptr)->member) == 8); \ 137 snprintf(buf, len, #member); \ 138 snprintf(data, len, "0x%llx : %llu", ((ptr)->member), ((ptr)->member)); \ 139 } while (0); 140 141#define BUF_DISP_utf(buf, data, len, ptr, member) \ 142 do { \ 143 snprintf(buf, len, #member); \ 144 } while (0); 145 146/* these are defined in kernel */ 147#define PAGE_SIZE 4096 148#define PAGE_CACHE_SIZE 4096 149#define BITS_PER_BYTE 8 150#define F2FS_SUPER_MAGIC 0xF2F52010 /* F2FS Magic Number */ 151#define CHECKSUM_OFFSET 4092 152 153/* for mkfs */ 154#define F2FS_MIN_VOLUME_SIZE 104857600 155#define F2FS_NUMBER_OF_CHECKPOINT_PACK 2 156#define DEFAULT_SECTOR_SIZE 512 157#define DEFAULT_SECTORS_PER_BLOCK 8 158#define DEFAULT_BLOCKS_PER_SEGMENT 512 159#define DEFAULT_SEGMENTS_PER_SECTION 1 160 161enum f2fs_config_func { 162 FSCK, 163 DUMP, 164}; 165 166struct f2fs_configuration { 167 u_int32_t sector_size; 168 u_int32_t reserved_segments; 169 u_int32_t overprovision; 170 u_int32_t cur_seg[6]; 171 u_int32_t segs_per_sec; 172 u_int32_t secs_per_zone; 173 u_int32_t start_sector; 174 u_int64_t total_sectors; 175 u_int32_t sectors_per_blk; 176 u_int32_t blks_per_seg; 177 char *vol_label; 178 int heap; 179 int32_t fd; 180 char *device_name; 181 char *extension_list; 182 int dbg_lv; 183 int trim; 184 int func; 185 void *private; 186} __attribute__((packed)); 187 188#ifndef CONFIG_64BIT 189#define BITS_PER_LONG 64 190#else 191#define BITS_PER_LONG 32 192#endif 193 194#define BIT_MASK(nr) (1 << (nr % BITS_PER_LONG)) 195#define BIT_WORD(nr) (nr / BITS_PER_LONG) 196 197/* 198 * Copied from fs/f2fs/f2fs.h 199 */ 200#define NR_CURSEG_DATA_TYPE (3) 201#define NR_CURSEG_NODE_TYPE (3) 202#define NR_CURSEG_TYPE (NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE) 203 204enum { 205 CURSEG_HOT_DATA = 0, /* directory entry blocks */ 206 CURSEG_WARM_DATA, /* data blocks */ 207 CURSEG_COLD_DATA, /* multimedia or GCed data blocks */ 208 CURSEG_HOT_NODE, /* direct node blocks of directory files */ 209 CURSEG_WARM_NODE, /* direct node blocks of normal files */ 210 CURSEG_COLD_NODE, /* indirect node blocks */ 211 NO_CHECK_TYPE 212}; 213 214/* 215 * Copied from fs/f2fs/segment.h 216 */ 217#define GET_SUM_TYPE(footer) ((footer)->entry_type) 218#define SET_SUM_TYPE(footer, type) ((footer)->entry_type = type) 219 220/* 221 * Copied from include/linux/f2fs_sb.h 222 */ 223#define F2FS_SUPER_OFFSET 1024 /* byte-size offset */ 224#define F2FS_LOG_SECTOR_SIZE 9 /* 9 bits for 512 byte */ 225#define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */ 226#define F2FS_BLKSIZE 4096 /* support only 4KB block */ 227#define F2FS_MAX_EXTENSION 64 /* # of extension entries */ 228 229#define NULL_ADDR 0x0U 230#define NEW_ADDR -1U 231 232#define F2FS_ROOT_INO(sbi) (sbi->root_ino_num) 233#define F2FS_NODE_INO(sbi) (sbi->node_ino_num) 234#define F2FS_META_INO(sbi) (sbi->meta_ino_num) 235 236/* This flag is used by node and meta inodes, and by recovery */ 237#define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) 238 239/* 240 * For further optimization on multi-head logs, on-disk layout supports maximum 241 * 16 logs by default. The number, 16, is expected to cover all the cases 242 * enoughly. The implementaion currently uses no more than 6 logs. 243 * Half the logs are used for nodes, and the other half are used for data. 244 */ 245#define MAX_ACTIVE_LOGS 16 246#define MAX_ACTIVE_NODE_LOGS 8 247#define MAX_ACTIVE_DATA_LOGS 8 248 249/* 250 * For superblock 251 */ 252struct f2fs_super_block { 253 __le32 magic; /* Magic Number */ 254 __le16 major_ver; /* Major Version */ 255 __le16 minor_ver; /* Minor Version */ 256 __le32 log_sectorsize; /* log2 sector size in bytes */ 257 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 258 __le32 log_blocksize; /* log2 block size in bytes */ 259 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 260 __le32 segs_per_sec; /* # of segments per section */ 261 __le32 secs_per_zone; /* # of sections per zone */ 262 __le32 checksum_offset; /* checksum offset inside super block */ 263 __le64 block_count; /* total # of user blocks */ 264 __le32 section_count; /* total # of sections */ 265 __le32 segment_count; /* total # of segments */ 266 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 267 __le32 segment_count_sit; /* # of segments for SIT */ 268 __le32 segment_count_nat; /* # of segments for NAT */ 269 __le32 segment_count_ssa; /* # of segments for SSA */ 270 __le32 segment_count_main; /* # of segments for main area */ 271 __le32 segment0_blkaddr; /* start block address of segment 0 */ 272 __le32 cp_blkaddr; /* start block address of checkpoint */ 273 __le32 sit_blkaddr; /* start block address of SIT */ 274 __le32 nat_blkaddr; /* start block address of NAT */ 275 __le32 ssa_blkaddr; /* start block address of SSA */ 276 __le32 main_blkaddr; /* start block address of main area */ 277 __le32 root_ino; /* root inode number */ 278 __le32 node_ino; /* node inode number */ 279 __le32 meta_ino; /* meta inode number */ 280 __u8 uuid[16]; /* 128-bit uuid for volume */ 281 __le16 volume_name[512]; /* volume name */ 282 __le32 extension_count; /* # of extensions below */ 283 __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */ 284} __attribute__((packed)); 285 286/* 287 * For checkpoint 288 */ 289#define CP_ERROR_FLAG 0x00000008 290#define CP_COMPACT_SUM_FLAG 0x00000004 291#define CP_ORPHAN_PRESENT_FLAG 0x00000002 292#define CP_UMOUNT_FLAG 0x00000001 293 294struct f2fs_checkpoint { 295 __le64 checkpoint_ver; /* checkpoint block version number */ 296 __le64 user_block_count; /* # of user blocks */ 297 __le64 valid_block_count; /* # of valid blocks in main area */ 298 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 299 __le32 overprov_segment_count; /* # of overprovision segments */ 300 __le32 free_segment_count; /* # of free segments in main area */ 301 302 /* information of current node segments */ 303 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 304 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 305 /* information of current data segments */ 306 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 307 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 308 __le32 ckpt_flags; /* Flags : umount and journal_present */ 309 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 310 __le32 cp_pack_start_sum; /* start block number of data summary */ 311 __le32 valid_node_count; /* Total number of valid nodes */ 312 __le32 valid_inode_count; /* Total number of valid inodes */ 313 __le32 next_free_nid; /* Next free node number */ 314 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 315 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 316 __le32 checksum_offset; /* checksum offset inside cp block */ 317 __le64 elapsed_time; /* mounted time */ 318 /* allocation type of current segment */ 319 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 320 321 /* SIT and NAT version bitmap */ 322 unsigned char sit_nat_version_bitmap[1]; 323} __attribute__((packed)); 324 325/* 326 * For orphan inode management 327 */ 328#define F2FS_ORPHANS_PER_BLOCK 1020 329 330struct f2fs_orphan_block { 331 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 332 __le32 reserved; /* reserved */ 333 __le16 blk_addr; /* block index in current CP */ 334 __le16 blk_count; /* Number of orphan inode blocks in CP */ 335 __le32 entry_count; /* Total number of orphan nodes in current CP */ 336 __le32 check_sum; /* CRC32 for orphan inode block */ 337} __attribute__((packed)); 338 339/* 340 * For NODE structure 341 */ 342struct f2fs_extent { 343 __le32 fofs; /* start file offset of the extent */ 344 __le32 blk_addr; /* start block address of the extent */ 345 __le32 len; /* lengh of the extent */ 346} __attribute__((packed)); 347 348#define F2FS_NAME_LEN 255 349#define F2FS_INLINE_XATTR_ADDRS 50 /* 200 bytes for inline xattrs */ 350#define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ 351#define ADDRS_PER_INODE(fi) addrs_per_inode(fi) 352#define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ 353#define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ 354 355#define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 356#define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 357#define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 358#define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 359#define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 360 361#define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 362#define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 363 364struct f2fs_inode { 365 __le16 i_mode; /* file mode */ 366 __u8 i_advise; /* file hints */ 367 __u8 i_inline; /* file inline flags */ 368 __le32 i_uid; /* user ID */ 369 __le32 i_gid; /* group ID */ 370 __le32 i_links; /* links count */ 371 __le64 i_size; /* file size in bytes */ 372 __le64 i_blocks; /* file size in blocks */ 373 __le64 i_atime; /* access time */ 374 __le64 i_ctime; /* change time */ 375 __le64 i_mtime; /* modification time */ 376 __le32 i_atime_nsec; /* access time in nano scale */ 377 __le32 i_ctime_nsec; /* change time in nano scale */ 378 __le32 i_mtime_nsec; /* modification time in nano scale */ 379 __le32 i_generation; /* file version (for NFS) */ 380 __le32 i_current_depth; /* only for directory depth */ 381 __le32 i_xattr_nid; /* nid to save xattr */ 382 __le32 i_flags; /* file attributes */ 383 __le32 i_pino; /* parent inode number */ 384 __le32 i_namelen; /* file name length */ 385 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 386 __u8 i_reserved2; /* for backward compatibility */ 387 388 struct f2fs_extent i_ext; /* caching a largest extent */ 389 390 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 391 392 __le32 i_nid[5]; /* direct(2), indirect(2), 393 double_indirect(1) node id */ 394} __attribute__((packed)); 395 396struct direct_node { 397 __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */ 398} __attribute__((packed)); 399 400struct indirect_node { 401 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 402} __attribute__((packed)); 403 404enum { 405 COLD_BIT_SHIFT = 0, 406 FSYNC_BIT_SHIFT, 407 DENT_BIT_SHIFT, 408 OFFSET_BIT_SHIFT 409}; 410 411struct node_footer { 412 __le32 nid; /* node id */ 413 __le32 ino; /* inode nunmber */ 414 __le32 flag; /* include cold/fsync/dentry marks and offset */ 415 __le64 cp_ver; /* checkpoint version */ 416 __le32 next_blkaddr; /* next node page block address */ 417} __attribute__((packed)); 418 419struct f2fs_node { 420 /* can be one of three types: inode, direct, and indirect types */ 421 union { 422 struct f2fs_inode i; 423 struct direct_node dn; 424 struct indirect_node in; 425 }; 426 struct node_footer footer; 427} __attribute__((packed)); 428 429/* 430 * For NAT entries 431 */ 432#define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry)) 433 434struct f2fs_nat_entry { 435 __u8 version; /* latest version of cached nat entry */ 436 __le32 ino; /* inode number */ 437 __le32 block_addr; /* block address */ 438} __attribute__((packed)); 439 440struct f2fs_nat_block { 441 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 442} __attribute__((packed)); 443 444/* 445 * For SIT entries 446 * 447 * Each segment is 2MB in size by default so that a bitmap for validity of 448 * there-in blocks should occupy 64 bytes, 512 bits. 449 * Not allow to change this. 450 */ 451#define SIT_VBLOCK_MAP_SIZE 64 452#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry)) 453 454/* 455 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 456 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 457 * [9:0] : valid block count 458 */ 459#define SIT_VBLOCKS_SHIFT 10 460#define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 461#define GET_SIT_VBLOCKS(raw_sit) \ 462 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 463#define GET_SIT_TYPE(raw_sit) \ 464 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 465 >> SIT_VBLOCKS_SHIFT) 466 467struct f2fs_sit_entry { 468 __le16 vblocks; /* reference above */ 469 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 470 __le64 mtime; /* segment age for cleaning */ 471} __attribute__((packed)); 472 473struct f2fs_sit_block { 474 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 475} __attribute__((packed)); 476 477/* 478 * For segment summary 479 * 480 * One summary block contains exactly 512 summary entries, which represents 481 * exactly 2MB segment by default. Not allow to change the basic units. 482 * 483 * NOTE: For initializing fields, you must use set_summary 484 * 485 * - If data page, nid represents dnode's nid 486 * - If node page, nid represents the node page's nid. 487 * 488 * The ofs_in_node is used by only data page. It represents offset 489 * from node's page's beginning to get a data block address. 490 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 491 */ 492#define ENTRIES_IN_SUM 512 493#define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 494#define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 495#define SUM_ENTRIES_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 496 497/* a summary entry for a 4KB-sized block in a segment */ 498struct f2fs_summary { 499 __le32 nid; /* parent node id */ 500 union { 501 __u8 reserved[3]; 502 struct { 503 __u8 version; /* node version number */ 504 __le16 ofs_in_node; /* block index in parent node */ 505 } __attribute__((packed)); 506 }; 507} __attribute__((packed)); 508 509/* summary block type, node or data, is stored to the summary_footer */ 510#define SUM_TYPE_NODE (1) 511#define SUM_TYPE_DATA (0) 512 513struct summary_footer { 514 unsigned char entry_type; /* SUM_TYPE_XXX */ 515 __u32 check_sum; /* summary checksum */ 516} __attribute__((packed)); 517 518#define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 519 SUM_ENTRIES_SIZE) 520#define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 521 sizeof(struct nat_journal_entry)) 522#define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 523 sizeof(struct nat_journal_entry)) 524#define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 525 sizeof(struct sit_journal_entry)) 526#define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 527 sizeof(struct sit_journal_entry)) 528/* 529 * frequently updated NAT/SIT entries can be stored in the spare area in 530 * summary blocks 531 */ 532enum { 533 NAT_JOURNAL = 0, 534 SIT_JOURNAL 535}; 536 537struct nat_journal_entry { 538 __le32 nid; 539 struct f2fs_nat_entry ne; 540} __attribute__((packed)); 541 542struct nat_journal { 543 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 544 __u8 reserved[NAT_JOURNAL_RESERVED]; 545} __attribute__((packed)); 546 547struct sit_journal_entry { 548 __le32 segno; 549 struct f2fs_sit_entry se; 550} __attribute__((packed)); 551 552struct sit_journal { 553 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 554 __u8 reserved[SIT_JOURNAL_RESERVED]; 555} __attribute__((packed)); 556 557/* 4KB-sized summary block structure */ 558struct f2fs_summary_block { 559 struct f2fs_summary entries[ENTRIES_IN_SUM]; 560 union { 561 __le16 n_nats; 562 __le16 n_sits; 563 }; 564 /* spare area is used by NAT or SIT journals */ 565 union { 566 struct nat_journal nat_j; 567 struct sit_journal sit_j; 568 }; 569 struct summary_footer footer; 570} __attribute__((packed)); 571 572/* 573 * For directory operations 574 */ 575#define F2FS_DOT_HASH 0 576#define F2FS_DDOT_HASH F2FS_DOT_HASH 577#define F2FS_MAX_HASH (~((0x3ULL) << 62)) 578#define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 579 580typedef __le32 f2fs_hash_t; 581 582/* One directory entry slot covers 8bytes-long file name */ 583#define F2FS_SLOT_LEN 8 584#define F2FS_SLOT_LEN_BITS 3 585 586#define GET_DENTRY_SLOTS(x) ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 587 588/* the number of dentry in a block */ 589#define NR_DENTRY_IN_BLOCK 214 590 591/* MAX level for dir lookup */ 592#define MAX_DIR_HASH_DEPTH 63 593 594#define SIZE_OF_DIR_ENTRY 11 /* by byte */ 595#define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 596 BITS_PER_BYTE) 597#define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 598 F2FS_SLOT_LEN) * \ 599 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 600 601/* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 602struct f2fs_dir_entry { 603 __le32 hash_code; /* hash code of file name */ 604 __le32 ino; /* inode number */ 605 __le16 name_len; /* lengh of file name */ 606 __u8 file_type; /* file type */ 607} __attribute__((packed)); 608 609/* 4KB-sized directory entry block */ 610struct f2fs_dentry_block { 611 /* validity bitmap for directory entries in each block */ 612 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 613 __u8 reserved[SIZE_OF_RESERVED]; 614 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 615 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 616} __attribute__((packed)); 617 618/* file types used in inode_info->flags */ 619enum FILE_TYPE { 620 F2FS_FT_UNKNOWN, 621 F2FS_FT_REG_FILE = 0x1, 622 F2FS_FT_DIR = 0x2, 623 F2FS_FT_CHRDEV = 0x4, 624 F2FS_FT_BLKDEV = 0x8, 625 F2FS_FT_FIFO = 0x10, 626 F2FS_FT_SOCK = 0x20, 627 F2FS_FT_SYMLINK = 0x40, 628 F2FS_FT_MAX = 0x80, 629 /* added for fsck */ 630 F2FS_FT_ORPHAN = 0x1000, 631}; 632 633/* from f2fs/segment.h */ 634enum { 635 LFS = 0, 636 SSR 637}; 638 639extern void ASCIIToUNICODE(u_int16_t *, u_int8_t *); 640extern int log_base_2(u_int32_t); 641 642extern int get_bits_in_byte(unsigned char n); 643extern int set_bit(unsigned int nr,void * addr); 644extern int clear_bit(unsigned int nr, void * addr); 645extern int test_bit(unsigned int nr, const void * addr); 646extern int f2fs_test_bit(unsigned int, const char *); 647extern int f2fs_set_bit(unsigned int, char *); 648extern int f2fs_clear_bit(unsigned int, char *); 649extern unsigned long find_next_bit(const unsigned long *, unsigned long, unsigned long); 650 651extern u_int32_t f2fs_cal_crc32(u_int32_t, void *, int); 652extern int f2fs_crc_valid(u_int32_t blk_crc, void *buf, int len); 653 654extern void f2fs_init_configuration(struct f2fs_configuration *); 655extern int f2fs_dev_is_umounted(struct f2fs_configuration *); 656extern int f2fs_get_device_info(struct f2fs_configuration *); 657 658extern int dev_read(void *, __u64, size_t); 659extern int dev_write(void *, __u64, size_t); 660 661extern int dev_read_block(void *, __u64); 662extern int dev_read_blocks(void *, __u64, __u32 ); 663 664f2fs_hash_t f2fs_dentry_hash(const char *, int); 665 666extern struct f2fs_configuration config; 667 668#endif /*__F2FS_FS_H */ 669