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 PAGE_SHIFT /* Max is Block Size */ 17 #define F2FS_LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) /* log number for sector/blk */ 18 #define F2FS_BLKSIZE PAGE_SIZE /* support only block == page */ 19 #define F2FS_BLKSIZE_BITS PAGE_SHIFT /* 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 31 /* 0, 1(node nid), 2(meta nid) are reserved node id */ 32 #define F2FS_RESERVED_NODE_NUM 3 33 34 #define F2FS_ROOT_INO(sbi) ((sbi)->root_ino_num) 35 #define F2FS_NODE_INO(sbi) ((sbi)->node_ino_num) 36 #define F2FS_META_INO(sbi) ((sbi)->meta_ino_num) 37 #define F2FS_COMPRESS_INO(sbi) (NM_I(sbi)->max_nid) 38 39 #define F2FS_MAX_QUOTAS 3 40 41 #define F2FS_ENC_UTF8_12_1 1 42 43 #define F2FS_IO_SIZE(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ 44 #define F2FS_IO_SIZE_KB(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits + 2) /* KB */ 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 #define F2FS_IO_ALIGNED(sbi) (F2FS_IO_SIZE(sbi) > 1) 48 49 /* This flag is used by node and meta inodes, and by recovery */ 50 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) 51 52 /* 53 * For further optimization on multi-head logs, on-disk layout supports maximum 54 * 16 logs by default. The number, 16, is expected to cover all the cases 55 * enoughly. The implementaion currently uses no more than 6 logs. 56 * Half the logs are used for nodes, and the other half are used for data. 57 */ 58 #define MAX_ACTIVE_LOGS 16 59 #define MAX_ACTIVE_NODE_LOGS 8 60 #define MAX_ACTIVE_DATA_LOGS 8 61 62 #define VERSION_LEN 256 63 #define MAX_VOLUME_NAME 512 64 #define MAX_PATH_LEN 64 65 #define MAX_DEVICES 8 66 67 /* 68 * For superblock 69 */ 70 struct f2fs_device { 71 __u8 path[MAX_PATH_LEN]; 72 __le32 total_segments; 73 } __packed; 74 75 /* reason of stop_checkpoint */ 76 enum stop_cp_reason { 77 STOP_CP_REASON_SHUTDOWN, 78 STOP_CP_REASON_FAULT_INJECT, 79 STOP_CP_REASON_META_PAGE, 80 STOP_CP_REASON_WRITE_FAIL, 81 STOP_CP_REASON_CORRUPTED_SUMMARY, 82 STOP_CP_REASON_UPDATE_INODE, 83 STOP_CP_REASON_FLUSH_FAIL, 84 STOP_CP_REASON_MAX, 85 }; 86 87 #define MAX_STOP_REASON 32 88 89 /* detail reason for EFSCORRUPTED */ 90 enum f2fs_error { 91 ERROR_CORRUPTED_CLUSTER, 92 ERROR_FAIL_DECOMPRESSION, 93 ERROR_INVALID_BLKADDR, 94 ERROR_CORRUPTED_DIRENT, 95 ERROR_CORRUPTED_INODE, 96 ERROR_INCONSISTENT_SUMMARY, 97 ERROR_INCONSISTENT_FOOTER, 98 ERROR_INCONSISTENT_SUM_TYPE, 99 ERROR_CORRUPTED_JOURNAL, 100 ERROR_INCONSISTENT_NODE_COUNT, 101 ERROR_INCONSISTENT_BLOCK_COUNT, 102 ERROR_INVALID_CURSEG, 103 ERROR_INCONSISTENT_SIT, 104 ERROR_CORRUPTED_VERITY_XATTR, 105 ERROR_CORRUPTED_XATTR, 106 ERROR_INVALID_NODE_REFERENCE, 107 ERROR_INCONSISTENT_NAT, 108 ERROR_MAX, 109 }; 110 111 #define MAX_F2FS_ERRORS 16 112 113 struct f2fs_super_block { 114 __le32 magic; /* Magic Number */ 115 __le16 major_ver; /* Major Version */ 116 __le16 minor_ver; /* Minor Version */ 117 __le32 log_sectorsize; /* log2 sector size in bytes */ 118 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 119 __le32 log_blocksize; /* log2 block size in bytes */ 120 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 121 __le32 segs_per_sec; /* # of segments per section */ 122 __le32 secs_per_zone; /* # of sections per zone */ 123 __le32 checksum_offset; /* checksum offset inside super block */ 124 __le64 block_count; /* total # of user blocks */ 125 __le32 section_count; /* total # of sections */ 126 __le32 segment_count; /* total # of segments */ 127 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 128 __le32 segment_count_sit; /* # of segments for SIT */ 129 __le32 segment_count_nat; /* # of segments for NAT */ 130 __le32 segment_count_ssa; /* # of segments for SSA */ 131 __le32 segment_count_main; /* # of segments for main area */ 132 __le32 segment0_blkaddr; /* start block address of segment 0 */ 133 __le32 cp_blkaddr; /* start block address of checkpoint */ 134 __le32 sit_blkaddr; /* start block address of SIT */ 135 __le32 nat_blkaddr; /* start block address of NAT */ 136 __le32 ssa_blkaddr; /* start block address of SSA */ 137 __le32 main_blkaddr; /* start block address of main area */ 138 __le32 root_ino; /* root inode number */ 139 __le32 node_ino; /* node inode number */ 140 __le32 meta_ino; /* meta inode number */ 141 __u8 uuid[16]; /* 128-bit uuid for volume */ 142 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ 143 __le32 extension_count; /* # of extensions below */ 144 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ 145 __le32 cp_payload; 146 __u8 version[VERSION_LEN]; /* the kernel version */ 147 __u8 init_version[VERSION_LEN]; /* the initial kernel version */ 148 __le32 feature; /* defined features */ 149 __u8 encryption_level; /* versioning level for encryption */ 150 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 151 struct f2fs_device devs[MAX_DEVICES]; /* device list */ 152 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ 153 __u8 hot_ext_count; /* # of hot file extension */ 154 __le16 s_encoding; /* Filename charset encoding */ 155 __le16 s_encoding_flags; /* Filename charset encoding flags */ 156 __u8 s_stop_reason[MAX_STOP_REASON]; /* stop checkpoint reason */ 157 __u8 s_errors[MAX_F2FS_ERRORS]; /* reason of image corrupts */ 158 __u8 reserved[258]; /* valid reserved region */ 159 __le32 crc; /* checksum of superblock */ 160 } __packed; 161 162 /* 163 * For checkpoint 164 */ 165 #define CP_RESIZEFS_FLAG 0x00004000 166 #define CP_DISABLED_QUICK_FLAG 0x00002000 167 #define CP_DISABLED_FLAG 0x00001000 168 #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800 169 #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 170 #define CP_NOCRC_RECOVERY_FLAG 0x00000200 171 #define CP_TRIMMED_FLAG 0x00000100 172 #define CP_NAT_BITS_FLAG 0x00000080 173 #define CP_CRC_RECOVERY_FLAG 0x00000040 174 #define CP_FASTBOOT_FLAG 0x00000020 175 #define CP_FSCK_FLAG 0x00000010 176 #define CP_ERROR_FLAG 0x00000008 177 #define CP_COMPACT_SUM_FLAG 0x00000004 178 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 179 #define CP_UMOUNT_FLAG 0x00000001 180 181 #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ 182 183 struct f2fs_checkpoint { 184 __le64 checkpoint_ver; /* checkpoint block version number */ 185 __le64 user_block_count; /* # of user blocks */ 186 __le64 valid_block_count; /* # of valid blocks in main area */ 187 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 188 __le32 overprov_segment_count; /* # of overprovision segments */ 189 __le32 free_segment_count; /* # of free segments in main area */ 190 191 /* information of current node segments */ 192 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 193 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 194 /* information of current data segments */ 195 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 196 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 197 __le32 ckpt_flags; /* Flags : umount and journal_present */ 198 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 199 __le32 cp_pack_start_sum; /* start block number of data summary */ 200 __le32 valid_node_count; /* Total number of valid nodes */ 201 __le32 valid_inode_count; /* Total number of valid inodes */ 202 __le32 next_free_nid; /* Next free node number */ 203 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 204 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 205 __le32 checksum_offset; /* checksum offset inside cp block */ 206 __le64 elapsed_time; /* mounted time */ 207 /* allocation type of current segment */ 208 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 209 210 /* SIT and NAT version bitmap */ 211 unsigned char sit_nat_version_bitmap[]; 212 } __packed; 213 214 #define CP_CHKSUM_OFFSET (F2FS_BLKSIZE - sizeof(__le32)) /* default chksum offset in checkpoint */ 215 #define CP_MIN_CHKSUM_OFFSET \ 216 (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap)) 217 218 /* 219 * For orphan inode management 220 */ 221 #define F2FS_ORPHANS_PER_BLOCK ((F2FS_BLKSIZE - 4 * sizeof(__le32)) / sizeof(__le32)) 222 223 #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ 224 F2FS_ORPHANS_PER_BLOCK) 225 226 struct f2fs_orphan_block { 227 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 228 __le32 reserved; /* reserved */ 229 __le16 blk_addr; /* block index in current CP */ 230 __le16 blk_count; /* Number of orphan inode blocks in CP */ 231 __le32 entry_count; /* Total number of orphan nodes in current CP */ 232 __le32 check_sum; /* CRC32 for orphan inode block */ 233 } __packed; 234 235 /* 236 * For NODE structure 237 */ 238 struct f2fs_extent { 239 __le32 fofs; /* start file offset of the extent */ 240 __le32 blk; /* start block address of the extent */ 241 __le32 len; /* length of the extent */ 242 } __packed; 243 244 #define F2FS_NAME_LEN 255 245 /* 200 bytes for inline xattrs by default */ 246 #define DEFAULT_INLINE_XATTR_ADDRS 50 247 248 #define OFFSET_OF_END_OF_I_EXT 360 249 #define SIZE_OF_I_NID 20 250 251 struct node_footer { 252 __le32 nid; /* node id */ 253 __le32 ino; /* inode number */ 254 __le32 flag; /* include cold/fsync/dentry marks and offset */ 255 __le64 cp_ver; /* checkpoint version */ 256 __le32 next_blkaddr; /* next node page block address */ 257 } __packed; 258 259 /* Address Pointers in an Inode */ 260 #define DEF_ADDRS_PER_INODE ((F2FS_BLKSIZE - OFFSET_OF_END_OF_I_EXT \ 261 - SIZE_OF_I_NID \ 262 - sizeof(struct node_footer)) / sizeof(__le32)) 263 #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ 264 get_extra_isize(inode)) 265 #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ 266 #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) 267 /* Address Pointers in a Direct Block */ 268 #define DEF_ADDRS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32)) 269 #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) 270 /* Node IDs in an Indirect Block */ 271 #define NIDS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32)) 272 273 #define ADDRS_PER_PAGE(page, inode) \ 274 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) 275 276 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 277 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 278 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 279 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 280 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 281 282 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 283 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 284 #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ 285 #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ 286 #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ 287 #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ 288 #define F2FS_PIN_FILE 0x40 /* file should not be gced */ 289 #define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */ 290 291 struct f2fs_inode { 292 __le16 i_mode; /* file mode */ 293 __u8 i_advise; /* file hints */ 294 __u8 i_inline; /* file inline flags */ 295 __le32 i_uid; /* user ID */ 296 __le32 i_gid; /* group ID */ 297 __le32 i_links; /* links count */ 298 __le64 i_size; /* file size in bytes */ 299 __le64 i_blocks; /* file size in blocks */ 300 __le64 i_atime; /* access time */ 301 __le64 i_ctime; /* change time */ 302 __le64 i_mtime; /* modification time */ 303 __le32 i_atime_nsec; /* access time in nano scale */ 304 __le32 i_ctime_nsec; /* change time in nano scale */ 305 __le32 i_mtime_nsec; /* modification time in nano scale */ 306 __le32 i_generation; /* file version (for NFS) */ 307 union { 308 __le32 i_current_depth; /* only for directory depth */ 309 __le16 i_gc_failures; /* 310 * # of gc failures on pinned file. 311 * only for regular files. 312 */ 313 }; 314 __le32 i_xattr_nid; /* nid to save xattr */ 315 __le32 i_flags; /* file attributes */ 316 __le32 i_pino; /* parent inode number */ 317 __le32 i_namelen; /* file name length */ 318 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 319 __u8 i_dir_level; /* dentry_level for large dir */ 320 321 struct f2fs_extent i_ext; /* caching a largest extent */ 322 323 union { 324 struct { 325 __le16 i_extra_isize; /* extra inode attribute size */ 326 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 327 __le32 i_projid; /* project id */ 328 __le32 i_inode_checksum;/* inode meta checksum */ 329 __le64 i_crtime; /* creation time */ 330 __le32 i_crtime_nsec; /* creation time in nano scale */ 331 __le64 i_compr_blocks; /* # of compressed blocks */ 332 __u8 i_compress_algorithm; /* compress algorithm */ 333 __u8 i_log_cluster_size; /* log of cluster size */ 334 __le16 i_compress_flag; /* compress flag */ 335 /* 0 bit: chksum flag 336 * [8,15] bits: compress level 337 */ 338 __le32 i_extra_end[0]; /* for attribute size calculation */ 339 } __packed; 340 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 341 }; 342 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 343 double_indirect(1) node id */ 344 } __packed; 345 346 struct direct_node { 347 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ 348 } __packed; 349 350 struct indirect_node { 351 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 352 } __packed; 353 354 enum { 355 COLD_BIT_SHIFT = 0, 356 FSYNC_BIT_SHIFT, 357 DENT_BIT_SHIFT, 358 OFFSET_BIT_SHIFT 359 }; 360 361 #define OFFSET_BIT_MASK GENMASK(OFFSET_BIT_SHIFT - 1, 0) 362 363 struct f2fs_node { 364 /* can be one of three types: inode, direct, and indirect types */ 365 union { 366 struct f2fs_inode i; 367 struct direct_node dn; 368 struct indirect_node in; 369 }; 370 struct node_footer footer; 371 } __packed; 372 373 /* 374 * For NAT entries 375 */ 376 #define NAT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / sizeof(struct f2fs_nat_entry)) 377 378 struct f2fs_nat_entry { 379 __u8 version; /* latest version of cached nat entry */ 380 __le32 ino; /* inode number */ 381 __le32 block_addr; /* block address */ 382 } __packed; 383 384 struct f2fs_nat_block { 385 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 386 } __packed; 387 388 /* 389 * For SIT entries 390 * 391 * A validity bitmap of 64 bytes covers 512 blocks of area. For a 4K page size, 392 * this results in a segment size of 2MB. For 16k pages, the default segment size 393 * is 8MB. 394 * Not allow to change this. 395 */ 396 #define SIT_VBLOCK_MAP_SIZE 64 397 #define SIT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / sizeof(struct f2fs_sit_entry)) 398 399 /* 400 * F2FS uses 4 bytes to represent block address. As a result, supported size of 401 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 402 */ 403 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 404 405 /* 406 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 407 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 408 * [9:0] : valid block count 409 */ 410 #define SIT_VBLOCKS_SHIFT 10 411 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 412 #define GET_SIT_VBLOCKS(raw_sit) \ 413 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 414 #define GET_SIT_TYPE(raw_sit) \ 415 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 416 >> SIT_VBLOCKS_SHIFT) 417 418 struct f2fs_sit_entry { 419 __le16 vblocks; /* reference above */ 420 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 421 __le64 mtime; /* segment age for cleaning */ 422 } __packed; 423 424 struct f2fs_sit_block { 425 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 426 } __packed; 427 428 /* 429 * For segment summary 430 * 431 * One summary block contains exactly 512 summary entries, which represents 432 * exactly one segment by default. Not allow to change the basic units. 433 * 434 * NOTE: For initializing fields, you must use set_summary 435 * 436 * - If data page, nid represents dnode's nid 437 * - If node page, nid represents the node page's nid. 438 * 439 * The ofs_in_node is used by only data page. It represents offset 440 * from node's page's beginning to get a data block address. 441 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 442 */ 443 #define ENTRIES_IN_SUM (F2FS_BLKSIZE / 8) 444 #define SUMMARY_SIZE (7) /* sizeof(struct f2fs_summary) */ 445 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 446 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 447 448 /* a summary entry for a block in a segment */ 449 struct f2fs_summary { 450 __le32 nid; /* parent node id */ 451 union { 452 __u8 reserved[3]; 453 struct { 454 __u8 version; /* node version number */ 455 __le16 ofs_in_node; /* block index in parent node */ 456 } __packed; 457 }; 458 } __packed; 459 460 /* summary block type, node or data, is stored to the summary_footer */ 461 #define SUM_TYPE_NODE (1) 462 #define SUM_TYPE_DATA (0) 463 464 struct summary_footer { 465 unsigned char entry_type; /* SUM_TYPE_XXX */ 466 __le32 check_sum; /* summary checksum */ 467 } __packed; 468 469 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 470 SUM_ENTRY_SIZE) 471 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 472 sizeof(struct nat_journal_entry)) 473 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 474 sizeof(struct nat_journal_entry)) 475 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 476 sizeof(struct sit_journal_entry)) 477 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 478 sizeof(struct sit_journal_entry)) 479 480 /* Reserved area should make size of f2fs_extra_info equals to 481 * that of nat_journal and sit_journal. 482 */ 483 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 484 485 /* 486 * frequently updated NAT/SIT entries can be stored in the spare area in 487 * summary blocks 488 */ 489 enum { 490 NAT_JOURNAL = 0, 491 SIT_JOURNAL 492 }; 493 494 struct nat_journal_entry { 495 __le32 nid; 496 struct f2fs_nat_entry ne; 497 } __packed; 498 499 struct nat_journal { 500 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 501 __u8 reserved[NAT_JOURNAL_RESERVED]; 502 } __packed; 503 504 struct sit_journal_entry { 505 __le32 segno; 506 struct f2fs_sit_entry se; 507 } __packed; 508 509 struct sit_journal { 510 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 511 __u8 reserved[SIT_JOURNAL_RESERVED]; 512 } __packed; 513 514 struct f2fs_extra_info { 515 __le64 kbytes_written; 516 __u8 reserved[EXTRA_INFO_RESERVED]; 517 } __packed; 518 519 struct f2fs_journal { 520 union { 521 __le16 n_nats; 522 __le16 n_sits; 523 }; 524 /* spare area is used by NAT or SIT journals or extra info */ 525 union { 526 struct nat_journal nat_j; 527 struct sit_journal sit_j; 528 struct f2fs_extra_info info; 529 }; 530 } __packed; 531 532 /* Block-sized summary block structure */ 533 struct f2fs_summary_block { 534 struct f2fs_summary entries[ENTRIES_IN_SUM]; 535 struct f2fs_journal journal; 536 struct summary_footer footer; 537 } __packed; 538 539 /* 540 * For directory operations 541 */ 542 #define F2FS_DOT_HASH 0 543 #define F2FS_DDOT_HASH F2FS_DOT_HASH 544 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 545 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 546 547 typedef __le32 f2fs_hash_t; 548 549 /* One directory entry slot covers 8bytes-long file name */ 550 #define F2FS_SLOT_LEN 8 551 #define F2FS_SLOT_LEN_BITS 3 552 553 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 554 555 /* MAX level for dir lookup */ 556 #define MAX_DIR_HASH_DEPTH 63 557 558 /* MAX buckets in one level of dir */ 559 #define MAX_DIR_BUCKETS BIT((MAX_DIR_HASH_DEPTH / 2) - 1) 560 561 /* 562 * space utilization of regular dentry and inline dentry (w/o extra reservation) 563 * regular dentry inline dentry (def) inline dentry (min) 564 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 565 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 566 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 567 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 568 * total 4096 3488 40 569 * 570 * Note: there are more reserved space in inline dentry than in regular 571 * dentry, when converting inline dentry we should handle this carefully. 572 */ 573 574 /* the number of dentry in a block */ 575 #define NR_DENTRY_IN_BLOCK ((BITS_PER_BYTE * F2FS_BLKSIZE) / \ 576 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * BITS_PER_BYTE + 1)) 577 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 578 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 579 BITS_PER_BYTE) 580 #define SIZE_OF_RESERVED (F2FS_BLKSIZE - ((SIZE_OF_DIR_ENTRY + \ 581 F2FS_SLOT_LEN) * \ 582 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 583 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ 584 585 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 586 struct f2fs_dir_entry { 587 __le32 hash_code; /* hash code of file name */ 588 __le32 ino; /* inode number */ 589 __le16 name_len; /* length of file name */ 590 __u8 file_type; /* file type */ 591 } __packed; 592 593 /* Block-sized directory entry block */ 594 struct f2fs_dentry_block { 595 /* validity bitmap for directory entries in each block */ 596 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 597 __u8 reserved[SIZE_OF_RESERVED]; 598 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 599 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 600 } __packed; 601 602 #define F2FS_DEF_PROJID 0 /* default project ID */ 603 604 #endif /* _LINUX_F2FS_FS_H */ 605