1 // SPDX-License-Identifier: GPL-2.0 2 /** 3 * include/linux/f2fs_fs.h 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com/ 7 */ 8 #ifndef _LINUX_F2FS_FS_H 9 #define _LINUX_F2FS_FS_H 10 11 #include <linux/pagemap.h> 12 #include <linux/types.h> 13 14 #define F2FS_SUPER_OFFSET 1024 /* byte-size offset */ 15 #define F2FS_MIN_LOG_SECTOR_SIZE 9 /* 9 bits for 512 bytes */ 16 #define F2FS_MAX_LOG_SECTOR_SIZE 12 /* 12 bits for 4096 bytes */ 17 #define F2FS_LOG_SECTORS_PER_BLOCK 3 /* log number for sector/blk */ 18 #define F2FS_BLKSIZE 4096 /* support only 4KB block */ 19 #define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */ 20 #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ 21 #define F2FS_EXTENSION_LEN 8 /* max size of extension */ 22 #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS) 23 24 #define NULL_ADDR ((block_t)0) /* used as block_t addresses */ 25 #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */ 26 #define COMPRESS_ADDR ((block_t)-2) /* used as compressed data flag */ 27 28 #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS) 29 #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS) 30 #define F2FS_BLK_END_BYTES(blk) (F2FS_BLK_TO_BYTES(blk + 1) - 1) 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 #define F2FS_COMPRESS_INO(sbi) (NM_I(sbi)->max_nid) 39 40 #define F2FS_MAX_QUOTAS 3 41 42 #define F2FS_ENC_UTF8_12_1 1 43 44 /* This flag is used by node and meta inodes, and by recovery */ 45 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) 46 47 /* 48 * For further optimization on multi-head logs, on-disk layout supports maximum 49 * 16 logs by default. The number, 16, is expected to cover all the cases 50 * enoughly. The implementaion currently uses no more than 6 logs. 51 * Half the logs are used for nodes, and the other half are used for data. 52 */ 53 #define MAX_ACTIVE_LOGS 16 54 #define MAX_ACTIVE_NODE_LOGS 8 55 #define MAX_ACTIVE_DATA_LOGS 8 56 57 #define VERSION_LEN 256 58 #define MAX_VOLUME_NAME 512 59 #define MAX_PATH_LEN 64 60 #define MAX_DEVICES 8 61 62 /* 63 * For superblock 64 */ 65 struct f2fs_device { 66 __u8 path[MAX_PATH_LEN]; 67 __le32 total_segments; 68 } __packed; 69 70 /* reason of stop_checkpoint */ 71 enum stop_cp_reason { 72 STOP_CP_REASON_SHUTDOWN, 73 STOP_CP_REASON_FAULT_INJECT, 74 STOP_CP_REASON_META_PAGE, 75 STOP_CP_REASON_WRITE_FAIL, 76 STOP_CP_REASON_CORRUPTED_SUMMARY, 77 STOP_CP_REASON_UPDATE_INODE, 78 STOP_CP_REASON_FLUSH_FAIL, 79 STOP_CP_REASON_NO_SEGMENT, 80 STOP_CP_REASON_MAX, 81 }; 82 83 #define MAX_STOP_REASON 32 84 85 /* detail reason for EFSCORRUPTED */ 86 enum f2fs_error { 87 ERROR_CORRUPTED_CLUSTER, 88 ERROR_FAIL_DECOMPRESSION, 89 ERROR_INVALID_BLKADDR, 90 ERROR_CORRUPTED_DIRENT, 91 ERROR_CORRUPTED_INODE, 92 ERROR_INCONSISTENT_SUMMARY, 93 ERROR_INCONSISTENT_FOOTER, 94 ERROR_INCONSISTENT_SUM_TYPE, 95 ERROR_CORRUPTED_JOURNAL, 96 ERROR_INCONSISTENT_NODE_COUNT, 97 ERROR_INCONSISTENT_BLOCK_COUNT, 98 ERROR_INVALID_CURSEG, 99 ERROR_INCONSISTENT_SIT, 100 ERROR_CORRUPTED_VERITY_XATTR, 101 ERROR_CORRUPTED_XATTR, 102 ERROR_INVALID_NODE_REFERENCE, 103 ERROR_INCONSISTENT_NAT, 104 ERROR_MAX, 105 }; 106 107 #define MAX_F2FS_ERRORS 16 108 109 struct f2fs_super_block { 110 __le32 magic; /* Magic Number */ 111 __le16 major_ver; /* Major Version */ 112 __le16 minor_ver; /* Minor Version */ 113 __le32 log_sectorsize; /* log2 sector size in bytes */ 114 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 115 __le32 log_blocksize; /* log2 block size in bytes */ 116 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 117 __le32 segs_per_sec; /* # of segments per section */ 118 __le32 secs_per_zone; /* # of sections per zone */ 119 __le32 checksum_offset; /* checksum offset inside super block */ 120 __le64 block_count; /* total # of user blocks */ 121 __le32 section_count; /* total # of sections */ 122 __le32 segment_count; /* total # of segments */ 123 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 124 __le32 segment_count_sit; /* # of segments for SIT */ 125 __le32 segment_count_nat; /* # of segments for NAT */ 126 __le32 segment_count_ssa; /* # of segments for SSA */ 127 __le32 segment_count_main; /* # of segments for main area */ 128 __le32 segment0_blkaddr; /* start block address of segment 0 */ 129 __le32 cp_blkaddr; /* start block address of checkpoint */ 130 __le32 sit_blkaddr; /* start block address of SIT */ 131 __le32 nat_blkaddr; /* start block address of NAT */ 132 __le32 ssa_blkaddr; /* start block address of SSA */ 133 __le32 main_blkaddr; /* start block address of main area */ 134 __le32 root_ino; /* root inode number */ 135 __le32 node_ino; /* node inode number */ 136 __le32 meta_ino; /* meta inode number */ 137 __u8 uuid[16]; /* 128-bit uuid for volume */ 138 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ 139 __le32 extension_count; /* # of extensions below */ 140 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ 141 __le32 cp_payload; 142 __u8 version[VERSION_LEN]; /* the kernel version */ 143 __u8 init_version[VERSION_LEN]; /* the initial kernel version */ 144 __le32 feature; /* defined features */ 145 __u8 encryption_level; /* versioning level for encryption */ 146 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 147 struct f2fs_device devs[MAX_DEVICES]; /* device list */ 148 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ 149 __u8 hot_ext_count; /* # of hot file extension */ 150 __le16 s_encoding; /* Filename charset encoding */ 151 __le16 s_encoding_flags; /* Filename charset encoding flags */ 152 __u8 s_stop_reason[MAX_STOP_REASON]; /* stop checkpoint reason */ 153 __u8 s_errors[MAX_F2FS_ERRORS]; /* reason of image corrupts */ 154 __u8 reserved[258]; /* valid reserved region */ 155 __le32 crc; /* checksum of superblock */ 156 } __packed; 157 158 /* 159 * For checkpoint 160 */ 161 #define CP_RESIZEFS_FLAG 0x00004000 162 #define CP_DISABLED_QUICK_FLAG 0x00002000 163 #define CP_DISABLED_FLAG 0x00001000 164 #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800 165 #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 166 #define CP_NOCRC_RECOVERY_FLAG 0x00000200 167 #define CP_TRIMMED_FLAG 0x00000100 168 #define CP_NAT_BITS_FLAG 0x00000080 169 #define CP_CRC_RECOVERY_FLAG 0x00000040 170 #define CP_FASTBOOT_FLAG 0x00000020 171 #define CP_FSCK_FLAG 0x00000010 172 #define CP_ERROR_FLAG 0x00000008 173 #define CP_COMPACT_SUM_FLAG 0x00000004 174 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 175 #define CP_UMOUNT_FLAG 0x00000001 176 177 #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ 178 179 struct f2fs_checkpoint { 180 __le64 checkpoint_ver; /* checkpoint block version number */ 181 __le64 user_block_count; /* # of user blocks */ 182 __le64 valid_block_count; /* # of valid blocks in main area */ 183 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 184 __le32 overprov_segment_count; /* # of overprovision segments */ 185 __le32 free_segment_count; /* # of free segments in main area */ 186 187 /* information of current node segments */ 188 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 189 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 190 /* information of current data segments */ 191 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 192 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 193 __le32 ckpt_flags; /* Flags : umount and journal_present */ 194 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 195 __le32 cp_pack_start_sum; /* start block number of data summary */ 196 __le32 valid_node_count; /* Total number of valid nodes */ 197 __le32 valid_inode_count; /* Total number of valid inodes */ 198 __le32 next_free_nid; /* Next free node number */ 199 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 200 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 201 __le32 checksum_offset; /* checksum offset inside cp block */ 202 __le64 elapsed_time; /* mounted time */ 203 /* allocation type of current segment */ 204 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 205 206 /* SIT and NAT version bitmap */ 207 unsigned char sit_nat_version_bitmap[]; 208 } __packed; 209 210 #define CP_CHKSUM_OFFSET 4092 /* default chksum offset in checkpoint */ 211 #define CP_MIN_CHKSUM_OFFSET \ 212 (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap)) 213 214 /* 215 * For orphan inode management 216 */ 217 #define F2FS_ORPHANS_PER_BLOCK 1020 218 219 #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ 220 F2FS_ORPHANS_PER_BLOCK) 221 222 struct f2fs_orphan_block { 223 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 224 __le32 reserved; /* reserved */ 225 __le16 blk_addr; /* block index in current CP */ 226 __le16 blk_count; /* Number of orphan inode blocks in CP */ 227 __le32 entry_count; /* Total number of orphan nodes in current CP */ 228 __le32 check_sum; /* CRC32 for orphan inode block */ 229 } __packed; 230 231 /* 232 * For NODE structure 233 */ 234 struct f2fs_extent { 235 __le32 fofs; /* start file offset of the extent */ 236 __le32 blk; /* start block address of the extent */ 237 __le32 len; /* length of the extent */ 238 } __packed; 239 240 #define F2FS_NAME_LEN 255 241 /* 200 bytes for inline xattrs by default */ 242 #define DEFAULT_INLINE_XATTR_ADDRS 50 243 #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ 244 #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ 245 get_extra_isize(inode)) 246 #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ 247 #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) 248 #define DEF_ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ 249 #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) 250 #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ 251 252 #define ADDRS_PER_PAGE(page, inode) \ 253 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) 254 255 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 256 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 257 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 258 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 259 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 260 261 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 262 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 263 #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ 264 #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ 265 #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries (obsolete) */ 266 #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ 267 #define F2FS_PIN_FILE 0x40 /* file should not be gced */ 268 #define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */ 269 270 struct f2fs_inode { 271 __le16 i_mode; /* file mode */ 272 __u8 i_advise; /* file hints */ 273 __u8 i_inline; /* file inline flags */ 274 __le32 i_uid; /* user ID */ 275 __le32 i_gid; /* group ID */ 276 __le32 i_links; /* links count */ 277 __le64 i_size; /* file size in bytes */ 278 __le64 i_blocks; /* file size in blocks */ 279 __le64 i_atime; /* access time */ 280 __le64 i_ctime; /* change time */ 281 __le64 i_mtime; /* modification time */ 282 __le32 i_atime_nsec; /* access time in nano scale */ 283 __le32 i_ctime_nsec; /* change time in nano scale */ 284 __le32 i_mtime_nsec; /* modification time in nano scale */ 285 __le32 i_generation; /* file version (for NFS) */ 286 union { 287 __le32 i_current_depth; /* only for directory depth */ 288 __le16 i_gc_failures; /* 289 * # of gc failures on pinned file. 290 * only for regular files. 291 */ 292 }; 293 __le32 i_xattr_nid; /* nid to save xattr */ 294 __le32 i_flags; /* file attributes */ 295 __le32 i_pino; /* parent inode number */ 296 __le32 i_namelen; /* file name length */ 297 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 298 __u8 i_dir_level; /* dentry_level for large dir */ 299 300 struct f2fs_extent i_ext; /* caching a largest extent */ 301 302 union { 303 struct { 304 __le16 i_extra_isize; /* extra inode attribute size */ 305 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 306 __le32 i_projid; /* project id */ 307 __le32 i_inode_checksum;/* inode meta checksum */ 308 __le64 i_crtime; /* creation time */ 309 __le32 i_crtime_nsec; /* creation time in nano scale */ 310 __le64 i_compr_blocks; /* # of compressed blocks */ 311 __u8 i_compress_algorithm; /* compress algorithm */ 312 __u8 i_log_cluster_size; /* log of cluster size */ 313 __le16 i_compress_flag; /* compress flag */ 314 /* 0 bit: chksum flag 315 * [8,15] bits: compress level 316 */ 317 __le32 i_extra_end[0]; /* for attribute size calculation */ 318 } __packed; 319 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 320 }; 321 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 322 double_indirect(1) node id */ 323 } __packed; 324 325 struct direct_node { 326 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ 327 } __packed; 328 329 struct indirect_node { 330 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 331 } __packed; 332 333 enum { 334 COLD_BIT_SHIFT = 0, 335 FSYNC_BIT_SHIFT, 336 DENT_BIT_SHIFT, 337 OFFSET_BIT_SHIFT 338 }; 339 340 #define OFFSET_BIT_MASK GENMASK(OFFSET_BIT_SHIFT - 1, 0) 341 342 struct node_footer { 343 __le32 nid; /* node id */ 344 __le32 ino; /* inode number */ 345 __le32 flag; /* include cold/fsync/dentry marks and offset */ 346 __le64 cp_ver; /* checkpoint version */ 347 __le32 next_blkaddr; /* next node page block address */ 348 } __packed; 349 350 struct f2fs_node { 351 /* can be one of three types: inode, direct, and indirect types */ 352 union { 353 struct f2fs_inode i; 354 struct direct_node dn; 355 struct indirect_node in; 356 }; 357 struct node_footer footer; 358 } __packed; 359 360 /* 361 * For NAT entries 362 */ 363 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry)) 364 365 struct f2fs_nat_entry { 366 __u8 version; /* latest version of cached nat entry */ 367 __le32 ino; /* inode number */ 368 __le32 block_addr; /* block address */ 369 } __packed; 370 371 struct f2fs_nat_block { 372 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 373 } __packed; 374 375 /* 376 * For SIT entries 377 * 378 * Each segment is 2MB in size by default so that a bitmap for validity of 379 * there-in blocks should occupy 64 bytes, 512 bits. 380 * Not allow to change this. 381 */ 382 #define SIT_VBLOCK_MAP_SIZE 64 383 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) 384 385 /* 386 * F2FS uses 4 bytes to represent block address. As a result, supported size of 387 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 388 */ 389 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 390 391 /* 392 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 393 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 394 * [9:0] : valid block count 395 */ 396 #define SIT_VBLOCKS_SHIFT 10 397 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 398 #define GET_SIT_VBLOCKS(raw_sit) \ 399 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 400 #define GET_SIT_TYPE(raw_sit) \ 401 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 402 >> SIT_VBLOCKS_SHIFT) 403 404 struct f2fs_sit_entry { 405 __le16 vblocks; /* reference above */ 406 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 407 __le64 mtime; /* segment age for cleaning */ 408 } __packed; 409 410 struct f2fs_sit_block { 411 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 412 } __packed; 413 414 /* 415 * For segment summary 416 * 417 * One summary block contains exactly 512 summary entries, which represents 418 * exactly 2MB segment by default. Not allow to change the basic units. 419 * 420 * NOTE: For initializing fields, you must use set_summary 421 * 422 * - If data page, nid represents dnode's nid 423 * - If node page, nid represents the node page's nid. 424 * 425 * The ofs_in_node is used by only data page. It represents offset 426 * from node's page's beginning to get a data block address. 427 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 428 */ 429 #define ENTRIES_IN_SUM 512 430 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 431 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 432 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 433 434 /* a summary entry for a 4KB-sized block in a segment */ 435 struct f2fs_summary { 436 __le32 nid; /* parent node id */ 437 union { 438 __u8 reserved[3]; 439 struct { 440 __u8 version; /* node version number */ 441 __le16 ofs_in_node; /* block index in parent node */ 442 } __packed; 443 }; 444 } __packed; 445 446 /* summary block type, node or data, is stored to the summary_footer */ 447 #define SUM_TYPE_NODE (1) 448 #define SUM_TYPE_DATA (0) 449 450 struct summary_footer { 451 unsigned char entry_type; /* SUM_TYPE_XXX */ 452 __le32 check_sum; /* summary checksum */ 453 } __packed; 454 455 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 456 SUM_ENTRY_SIZE) 457 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 458 sizeof(struct nat_journal_entry)) 459 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 460 sizeof(struct nat_journal_entry)) 461 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 462 sizeof(struct sit_journal_entry)) 463 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 464 sizeof(struct sit_journal_entry)) 465 466 /* Reserved area should make size of f2fs_extra_info equals to 467 * that of nat_journal and sit_journal. 468 */ 469 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 470 471 /* 472 * frequently updated NAT/SIT entries can be stored in the spare area in 473 * summary blocks 474 */ 475 enum { 476 NAT_JOURNAL = 0, 477 SIT_JOURNAL 478 }; 479 480 struct nat_journal_entry { 481 __le32 nid; 482 struct f2fs_nat_entry ne; 483 } __packed; 484 485 struct nat_journal { 486 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 487 __u8 reserved[NAT_JOURNAL_RESERVED]; 488 } __packed; 489 490 struct sit_journal_entry { 491 __le32 segno; 492 struct f2fs_sit_entry se; 493 } __packed; 494 495 struct sit_journal { 496 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 497 __u8 reserved[SIT_JOURNAL_RESERVED]; 498 } __packed; 499 500 struct f2fs_extra_info { 501 __le64 kbytes_written; 502 __u8 reserved[EXTRA_INFO_RESERVED]; 503 } __packed; 504 505 struct f2fs_journal { 506 union { 507 __le16 n_nats; 508 __le16 n_sits; 509 }; 510 /* spare area is used by NAT or SIT journals or extra info */ 511 union { 512 struct nat_journal nat_j; 513 struct sit_journal sit_j; 514 struct f2fs_extra_info info; 515 }; 516 } __packed; 517 518 /* 4KB-sized summary block structure */ 519 struct f2fs_summary_block { 520 struct f2fs_summary entries[ENTRIES_IN_SUM]; 521 struct f2fs_journal journal; 522 struct summary_footer footer; 523 } __packed; 524 525 /* 526 * For directory operations 527 */ 528 #define F2FS_DOT_HASH 0 529 #define F2FS_DDOT_HASH F2FS_DOT_HASH 530 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 531 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 532 533 typedef __le32 f2fs_hash_t; 534 535 /* One directory entry slot covers 8bytes-long file name */ 536 #define F2FS_SLOT_LEN 8 537 #define F2FS_SLOT_LEN_BITS 3 538 539 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 540 541 /* MAX level for dir lookup */ 542 #define MAX_DIR_HASH_DEPTH 63 543 544 /* MAX buckets in one level of dir */ 545 #define MAX_DIR_BUCKETS BIT((MAX_DIR_HASH_DEPTH / 2) - 1) 546 547 /* 548 * space utilization of regular dentry and inline dentry (w/o extra reservation) 549 * regular dentry inline dentry (def) inline dentry (min) 550 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 551 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 552 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 553 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 554 * total 4096 3488 40 555 * 556 * Note: there are more reserved space in inline dentry than in regular 557 * dentry, when converting inline dentry we should handle this carefully. 558 */ 559 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */ 560 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 561 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 562 BITS_PER_BYTE) 563 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 564 F2FS_SLOT_LEN) * \ 565 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 566 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ 567 568 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 569 struct f2fs_dir_entry { 570 __le32 hash_code; /* hash code of file name */ 571 __le32 ino; /* inode number */ 572 __le16 name_len; /* length of file name */ 573 __u8 file_type; /* file type */ 574 } __packed; 575 576 /* 4KB-sized directory entry block */ 577 struct f2fs_dentry_block { 578 /* validity bitmap for directory entries in each block */ 579 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 580 __u8 reserved[SIZE_OF_RESERVED]; 581 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 582 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 583 } __packed; 584 585 #define F2FS_DEF_PROJID 0 /* default project ID */ 586 587 #endif /* _LINUX_F2FS_FS_H */ 588