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#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 */ 65struct f2fs_device { 66 __u8 path[MAX_PATH_LEN]; 67 __le32 total_segments; 68} __packed; 69 70/* reason of stop_checkpoint */ 71enum 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 */ 86enum 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 109struct 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 179struct 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 (F2FS_BLKSIZE - sizeof(__le32)) /* 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 ((F2FS_BLKSIZE - 4 * sizeof(__le32)) / sizeof(__le32)) 218 219#define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ 220 F2FS_ORPHANS_PER_BLOCK) 221 222struct 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 */ 234struct 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 50 243 244#define OFFSET_OF_END_OF_I_EXT 360 245#define SIZE_OF_I_NID 20 246 247struct node_footer { 248 __le32 nid; /* node id */ 249 __le32 ino; /* inode number */ 250 __le32 flag; /* include cold/fsync/dentry marks and offset */ 251 __le64 cp_ver; /* checkpoint version */ 252 __le32 next_blkaddr; /* next node page block address */ 253} __packed; 254 255/* Address Pointers in an Inode */ 256#define DEF_ADDRS_PER_INODE ((F2FS_BLKSIZE - OFFSET_OF_END_OF_I_EXT \ 257 - SIZE_OF_I_NID \ 258 - sizeof(struct node_footer)) / sizeof(__le32)) 259#define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ 260 get_extra_isize(inode)) 261#define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ 262#define ADDRS_PER_INODE(inode) addrs_per_inode(inode) 263/* Address Pointers in a Direct Block */ 264#define DEF_ADDRS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32)) 265#define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) 266/* Node IDs in an Indirect Block */ 267#define NIDS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32)) 268 269#define ADDRS_PER_PAGE(page, inode) \ 270 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) 271 272#define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 273#define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 274#define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 275#define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 276#define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 277 278#define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 279#define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 280#define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ 281#define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ 282#define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ 283#define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ 284#define F2FS_PIN_FILE 0x40 /* file should not be gced */ 285#define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */ 286 287struct f2fs_inode { 288 __le16 i_mode; /* file mode */ 289 __u8 i_advise; /* file hints */ 290 __u8 i_inline; /* file inline flags */ 291 __le32 i_uid; /* user ID */ 292 __le32 i_gid; /* group ID */ 293 __le32 i_links; /* links count */ 294 __le64 i_size; /* file size in bytes */ 295 __le64 i_blocks; /* file size in blocks */ 296 __le64 i_atime; /* access time */ 297 __le64 i_ctime; /* change time */ 298 __le64 i_mtime; /* modification time */ 299 __le32 i_atime_nsec; /* access time in nano scale */ 300 __le32 i_ctime_nsec; /* change time in nano scale */ 301 __le32 i_mtime_nsec; /* modification time in nano scale */ 302 __le32 i_generation; /* file version (for NFS) */ 303 union { 304 __le32 i_current_depth; /* only for directory depth */ 305 __le16 i_gc_failures; /* 306 * # of gc failures on pinned file. 307 * only for regular files. 308 */ 309 }; 310 __le32 i_xattr_nid; /* nid to save xattr */ 311 __le32 i_flags; /* file attributes */ 312 __le32 i_pino; /* parent inode number */ 313 __le32 i_namelen; /* file name length */ 314 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 315 __u8 i_dir_level; /* dentry_level for large dir */ 316 317 struct f2fs_extent i_ext; /* caching a largest extent */ 318 319 union { 320 struct { 321 __le16 i_extra_isize; /* extra inode attribute size */ 322 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 323 __le32 i_projid; /* project id */ 324 __le32 i_inode_checksum;/* inode meta checksum */ 325 __le64 i_crtime; /* creation time */ 326 __le32 i_crtime_nsec; /* creation time in nano scale */ 327 __le64 i_compr_blocks; /* # of compressed blocks */ 328 __u8 i_compress_algorithm; /* compress algorithm */ 329 __u8 i_log_cluster_size; /* log of cluster size */ 330 __le16 i_compress_flag; /* compress flag */ 331 /* 0 bit: chksum flag 332 * [8,15] bits: compress level 333 */ 334 __le32 i_extra_end[0]; /* for attribute size calculation */ 335 } __packed; 336 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 337 }; 338 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 339 double_indirect(1) node id */ 340} __packed; 341 342struct direct_node { 343 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ 344} __packed; 345 346struct indirect_node { 347 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 348} __packed; 349 350enum { 351 COLD_BIT_SHIFT = 0, 352 FSYNC_BIT_SHIFT, 353 DENT_BIT_SHIFT, 354 OFFSET_BIT_SHIFT 355}; 356 357#define OFFSET_BIT_MASK GENMASK(OFFSET_BIT_SHIFT - 1, 0) 358 359struct f2fs_node { 360 /* can be one of three types: inode, direct, and indirect types */ 361 union { 362 struct f2fs_inode i; 363 struct direct_node dn; 364 struct indirect_node in; 365 }; 366 struct node_footer footer; 367} __packed; 368 369/* 370 * For NAT entries 371 */ 372#define NAT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / sizeof(struct f2fs_nat_entry)) 373 374struct f2fs_nat_entry { 375 __u8 version; /* latest version of cached nat entry */ 376 __le32 ino; /* inode number */ 377 __le32 block_addr; /* block address */ 378} __packed; 379 380struct f2fs_nat_block { 381 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 382} __packed; 383 384/* 385 * For SIT entries 386 * 387 * A validity bitmap of 64 bytes covers 512 blocks of area. For a 4K page size, 388 * this results in a segment size of 2MB. For 16k pages, the default segment size 389 * is 8MB. 390 * Not allow to change this. 391 */ 392#define SIT_VBLOCK_MAP_SIZE 64 393#define SIT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / sizeof(struct f2fs_sit_entry)) 394 395/* 396 * F2FS uses 4 bytes to represent block address. As a result, supported size of 397 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 398 */ 399#define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 400 401/* 402 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 403 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 404 * [9:0] : valid block count 405 */ 406#define SIT_VBLOCKS_SHIFT 10 407#define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 408#define GET_SIT_VBLOCKS(raw_sit) \ 409 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 410#define GET_SIT_TYPE(raw_sit) \ 411 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 412 >> SIT_VBLOCKS_SHIFT) 413 414struct f2fs_sit_entry { 415 __le16 vblocks; /* reference above */ 416 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 417 __le64 mtime; /* segment age for cleaning */ 418} __packed; 419 420struct f2fs_sit_block { 421 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 422} __packed; 423 424/* 425 * For segment summary 426 * 427 * One summary block contains exactly 512 summary entries, which represents 428 * exactly one segment by default. Not allow to change the basic units. 429 * 430 * NOTE: For initializing fields, you must use set_summary 431 * 432 * - If data page, nid represents dnode's nid 433 * - If node page, nid represents the node page's nid. 434 * 435 * The ofs_in_node is used by only data page. It represents offset 436 * from node's page's beginning to get a data block address. 437 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 438 */ 439#define ENTRIES_IN_SUM (F2FS_BLKSIZE / 8) 440#define SUMMARY_SIZE (7) /* sizeof(struct f2fs_summary) */ 441#define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 442#define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 443 444/* a summary entry for a block in a segment */ 445struct f2fs_summary { 446 __le32 nid; /* parent node id */ 447 union { 448 __u8 reserved[3]; 449 struct { 450 __u8 version; /* node version number */ 451 __le16 ofs_in_node; /* block index in parent node */ 452 } __packed; 453 }; 454} __packed; 455 456/* summary block type, node or data, is stored to the summary_footer */ 457#define SUM_TYPE_NODE (1) 458#define SUM_TYPE_DATA (0) 459 460struct summary_footer { 461 unsigned char entry_type; /* SUM_TYPE_XXX */ 462 __le32 check_sum; /* summary checksum */ 463} __packed; 464 465#define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 466 SUM_ENTRY_SIZE) 467#define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 468 sizeof(struct nat_journal_entry)) 469#define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 470 sizeof(struct nat_journal_entry)) 471#define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 472 sizeof(struct sit_journal_entry)) 473#define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 474 sizeof(struct sit_journal_entry)) 475 476/* Reserved area should make size of f2fs_extra_info equals to 477 * that of nat_journal and sit_journal. 478 */ 479#define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 480 481/* 482 * frequently updated NAT/SIT entries can be stored in the spare area in 483 * summary blocks 484 */ 485enum { 486 NAT_JOURNAL = 0, 487 SIT_JOURNAL 488}; 489 490struct nat_journal_entry { 491 __le32 nid; 492 struct f2fs_nat_entry ne; 493} __packed; 494 495struct nat_journal { 496 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 497 __u8 reserved[NAT_JOURNAL_RESERVED]; 498} __packed; 499 500struct sit_journal_entry { 501 __le32 segno; 502 struct f2fs_sit_entry se; 503} __packed; 504 505struct sit_journal { 506 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 507 __u8 reserved[SIT_JOURNAL_RESERVED]; 508} __packed; 509 510struct f2fs_extra_info { 511 __le64 kbytes_written; 512 __u8 reserved[EXTRA_INFO_RESERVED]; 513} __packed; 514 515struct f2fs_journal { 516 union { 517 __le16 n_nats; 518 __le16 n_sits; 519 }; 520 /* spare area is used by NAT or SIT journals or extra info */ 521 union { 522 struct nat_journal nat_j; 523 struct sit_journal sit_j; 524 struct f2fs_extra_info info; 525 }; 526} __packed; 527 528/* Block-sized summary block structure */ 529struct f2fs_summary_block { 530 struct f2fs_summary entries[ENTRIES_IN_SUM]; 531 struct f2fs_journal journal; 532 struct summary_footer footer; 533} __packed; 534 535/* 536 * For directory operations 537 */ 538#define F2FS_DOT_HASH 0 539#define F2FS_DDOT_HASH F2FS_DOT_HASH 540#define F2FS_MAX_HASH (~((0x3ULL) << 62)) 541#define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 542 543typedef __le32 f2fs_hash_t; 544 545/* One directory entry slot covers 8bytes-long file name */ 546#define F2FS_SLOT_LEN 8 547#define F2FS_SLOT_LEN_BITS 3 548 549#define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 550 551/* MAX level for dir lookup */ 552#define MAX_DIR_HASH_DEPTH 63 553 554/* MAX buckets in one level of dir */ 555#define MAX_DIR_BUCKETS BIT((MAX_DIR_HASH_DEPTH / 2) - 1) 556 557/* 558 * space utilization of regular dentry and inline dentry (w/o extra reservation) 559 * regular dentry inline dentry (def) inline dentry (min) 560 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 561 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 562 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 563 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 564 * total 4096 3488 40 565 * 566 * Note: there are more reserved space in inline dentry than in regular 567 * dentry, when converting inline dentry we should handle this carefully. 568 */ 569 570/* the number of dentry in a block */ 571#define NR_DENTRY_IN_BLOCK ((BITS_PER_BYTE * F2FS_BLKSIZE) / \ 572 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * BITS_PER_BYTE + 1)) 573#define SIZE_OF_DIR_ENTRY 11 /* by byte */ 574#define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 575 BITS_PER_BYTE) 576#define SIZE_OF_RESERVED (F2FS_BLKSIZE - ((SIZE_OF_DIR_ENTRY + \ 577 F2FS_SLOT_LEN) * \ 578 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 579#define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ 580 581/* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 582struct f2fs_dir_entry { 583 __le32 hash_code; /* hash code of file name */ 584 __le32 ino; /* inode number */ 585 __le16 name_len; /* length of file name */ 586 __u8 file_type; /* file type */ 587} __packed; 588 589/* Block-sized directory entry block */ 590struct f2fs_dentry_block { 591 /* validity bitmap for directory entries in each block */ 592 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 593 __u8 reserved[SIZE_OF_RESERVED]; 594 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 595 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 596} __packed; 597 598#define F2FS_DEF_PROJID 0 /* default project ID */ 599 600#endif /* _LINUX_F2FS_FS_H */ 601