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 27 #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS) 28 #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS) 29 30 /* 0, 1(node nid), 2(meta nid) are reserved node id */ 31 #define F2FS_RESERVED_NODE_NUM 3 32 33 #define F2FS_ROOT_INO(sbi) ((sbi)->root_ino_num) 34 #define F2FS_NODE_INO(sbi) ((sbi)->node_ino_num) 35 #define F2FS_META_INO(sbi) ((sbi)->meta_ino_num) 36 37 #define F2FS_MAX_QUOTAS 3 38 39 #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ 40 #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */ 41 #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */ 42 #define F2FS_IO_SIZE_BITS(sbi) (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */ 43 #define F2FS_IO_SIZE_MASK(sbi) (F2FS_IO_SIZE(sbi) - 1) 44 45 /* This flag is used by node and meta inodes, and by recovery */ 46 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) 47 48 /* 49 * For further optimization on multi-head logs, on-disk layout supports maximum 50 * 16 logs by default. The number, 16, is expected to cover all the cases 51 * enoughly. The implementaion currently uses no more than 6 logs. 52 * Half the logs are used for nodes, and the other half are used for data. 53 */ 54 #define MAX_ACTIVE_LOGS 16 55 #define MAX_ACTIVE_NODE_LOGS 8 56 #define MAX_ACTIVE_DATA_LOGS 8 57 58 #define VERSION_LEN 256 59 #define MAX_VOLUME_NAME 512 60 #define MAX_PATH_LEN 64 61 #define MAX_DEVICES 8 62 63 /* 64 * For superblock 65 */ 66 struct f2fs_device { 67 __u8 path[MAX_PATH_LEN]; 68 __le32 total_segments; 69 } __packed; 70 71 struct f2fs_super_block { 72 __le32 magic; /* Magic Number */ 73 __le16 major_ver; /* Major Version */ 74 __le16 minor_ver; /* Minor Version */ 75 __le32 log_sectorsize; /* log2 sector size in bytes */ 76 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 77 __le32 log_blocksize; /* log2 block size in bytes */ 78 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 79 __le32 segs_per_sec; /* # of segments per section */ 80 __le32 secs_per_zone; /* # of sections per zone */ 81 __le32 checksum_offset; /* checksum offset inside super block */ 82 __le64 block_count; /* total # of user blocks */ 83 __le32 section_count; /* total # of sections */ 84 __le32 segment_count; /* total # of segments */ 85 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 86 __le32 segment_count_sit; /* # of segments for SIT */ 87 __le32 segment_count_nat; /* # of segments for NAT */ 88 __le32 segment_count_ssa; /* # of segments for SSA */ 89 __le32 segment_count_main; /* # of segments for main area */ 90 __le32 segment0_blkaddr; /* start block address of segment 0 */ 91 __le32 cp_blkaddr; /* start block address of checkpoint */ 92 __le32 sit_blkaddr; /* start block address of SIT */ 93 __le32 nat_blkaddr; /* start block address of NAT */ 94 __le32 ssa_blkaddr; /* start block address of SSA */ 95 __le32 main_blkaddr; /* start block address of main area */ 96 __le32 root_ino; /* root inode number */ 97 __le32 node_ino; /* node inode number */ 98 __le32 meta_ino; /* meta inode number */ 99 __u8 uuid[16]; /* 128-bit uuid for volume */ 100 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ 101 __le32 extension_count; /* # of extensions below */ 102 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ 103 __le32 cp_payload; 104 __u8 version[VERSION_LEN]; /* the kernel version */ 105 __u8 init_version[VERSION_LEN]; /* the initial kernel version */ 106 __le32 feature; /* defined features */ 107 __u8 encryption_level; /* versioning level for encryption */ 108 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 109 struct f2fs_device devs[MAX_DEVICES]; /* device list */ 110 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ 111 __u8 hot_ext_count; /* # of hot file extension */ 112 __u8 reserved[310]; /* valid reserved region */ 113 __le32 crc; /* checksum of superblock */ 114 } __packed; 115 116 /* 117 * For checkpoint 118 */ 119 #define CP_DISABLED_QUICK_FLAG 0x00002000 120 #define CP_DISABLED_FLAG 0x00001000 121 #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800 122 #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 123 #define CP_NOCRC_RECOVERY_FLAG 0x00000200 124 #define CP_TRIMMED_FLAG 0x00000100 125 #define CP_NAT_BITS_FLAG 0x00000080 126 #define CP_CRC_RECOVERY_FLAG 0x00000040 127 #define CP_FASTBOOT_FLAG 0x00000020 128 #define CP_FSCK_FLAG 0x00000010 129 #define CP_ERROR_FLAG 0x00000008 130 #define CP_COMPACT_SUM_FLAG 0x00000004 131 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 132 #define CP_UMOUNT_FLAG 0x00000001 133 134 #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ 135 136 struct f2fs_checkpoint { 137 __le64 checkpoint_ver; /* checkpoint block version number */ 138 __le64 user_block_count; /* # of user blocks */ 139 __le64 valid_block_count; /* # of valid blocks in main area */ 140 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 141 __le32 overprov_segment_count; /* # of overprovision segments */ 142 __le32 free_segment_count; /* # of free segments in main area */ 143 144 /* information of current node segments */ 145 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 146 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 147 /* information of current data segments */ 148 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 149 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 150 __le32 ckpt_flags; /* Flags : umount and journal_present */ 151 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 152 __le32 cp_pack_start_sum; /* start block number of data summary */ 153 __le32 valid_node_count; /* Total number of valid nodes */ 154 __le32 valid_inode_count; /* Total number of valid inodes */ 155 __le32 next_free_nid; /* Next free node number */ 156 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 157 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 158 __le32 checksum_offset; /* checksum offset inside cp block */ 159 __le64 elapsed_time; /* mounted time */ 160 /* allocation type of current segment */ 161 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 162 163 /* SIT and NAT version bitmap */ 164 unsigned char sit_nat_version_bitmap[1]; 165 } __packed; 166 167 #define CP_CHKSUM_OFFSET 4092 /* default chksum offset in checkpoint */ 168 #define CP_MIN_CHKSUM_OFFSET \ 169 (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap)) 170 171 /* 172 * For orphan inode management 173 */ 174 #define F2FS_ORPHANS_PER_BLOCK 1020 175 176 #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ 177 F2FS_ORPHANS_PER_BLOCK) 178 179 struct f2fs_orphan_block { 180 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 181 __le32 reserved; /* reserved */ 182 __le16 blk_addr; /* block index in current CP */ 183 __le16 blk_count; /* Number of orphan inode blocks in CP */ 184 __le32 entry_count; /* Total number of orphan nodes in current CP */ 185 __le32 check_sum; /* CRC32 for orphan inode block */ 186 } __packed; 187 188 /* 189 * For NODE structure 190 */ 191 struct f2fs_extent { 192 __le32 fofs; /* start file offset of the extent */ 193 __le32 blk; /* start block address of the extent */ 194 __le32 len; /* length of the extent */ 195 } __packed; 196 197 #define F2FS_NAME_LEN 255 198 /* 200 bytes for inline xattrs by default */ 199 #define DEFAULT_INLINE_XATTR_ADDRS 50 200 #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ 201 #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ 202 get_extra_isize(inode)) 203 #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ 204 #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) 205 #define DEF_ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ 206 #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) 207 #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ 208 209 #define ADDRS_PER_PAGE(page, inode) \ 210 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) 211 212 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 213 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 214 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 215 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 216 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 217 218 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 219 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 220 #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ 221 #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ 222 #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ 223 #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ 224 #define F2FS_PIN_FILE 0x40 /* file should not be gced */ 225 226 struct f2fs_inode { 227 __le16 i_mode; /* file mode */ 228 __u8 i_advise; /* file hints */ 229 __u8 i_inline; /* file inline flags */ 230 __le32 i_uid; /* user ID */ 231 __le32 i_gid; /* group ID */ 232 __le32 i_links; /* links count */ 233 __le64 i_size; /* file size in bytes */ 234 __le64 i_blocks; /* file size in blocks */ 235 __le64 i_atime; /* access time */ 236 __le64 i_ctime; /* change time */ 237 __le64 i_mtime; /* modification time */ 238 __le32 i_atime_nsec; /* access time in nano scale */ 239 __le32 i_ctime_nsec; /* change time in nano scale */ 240 __le32 i_mtime_nsec; /* modification time in nano scale */ 241 __le32 i_generation; /* file version (for NFS) */ 242 union { 243 __le32 i_current_depth; /* only for directory depth */ 244 __le16 i_gc_failures; /* 245 * # of gc failures on pinned file. 246 * only for regular files. 247 */ 248 }; 249 __le32 i_xattr_nid; /* nid to save xattr */ 250 __le32 i_flags; /* file attributes */ 251 __le32 i_pino; /* parent inode number */ 252 __le32 i_namelen; /* file name length */ 253 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 254 __u8 i_dir_level; /* dentry_level for large dir */ 255 256 struct f2fs_extent i_ext; /* caching a largest extent */ 257 258 union { 259 struct { 260 __le16 i_extra_isize; /* extra inode attribute size */ 261 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 262 __le32 i_projid; /* project id */ 263 __le32 i_inode_checksum;/* inode meta checksum */ 264 __le64 i_crtime; /* creation time */ 265 __le32 i_crtime_nsec; /* creation time in nano scale */ 266 __le32 i_extra_end[0]; /* for attribute size calculation */ 267 } __packed; 268 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 269 }; 270 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 271 double_indirect(1) node id */ 272 } __packed; 273 274 struct direct_node { 275 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ 276 } __packed; 277 278 struct indirect_node { 279 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 280 } __packed; 281 282 enum { 283 COLD_BIT_SHIFT = 0, 284 FSYNC_BIT_SHIFT, 285 DENT_BIT_SHIFT, 286 OFFSET_BIT_SHIFT 287 }; 288 289 #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */ 290 291 struct node_footer { 292 __le32 nid; /* node id */ 293 __le32 ino; /* inode number */ 294 __le32 flag; /* include cold/fsync/dentry marks and offset */ 295 __le64 cp_ver; /* checkpoint version */ 296 __le32 next_blkaddr; /* next node page block address */ 297 } __packed; 298 299 struct f2fs_node { 300 /* can be one of three types: inode, direct, and indirect types */ 301 union { 302 struct f2fs_inode i; 303 struct direct_node dn; 304 struct indirect_node in; 305 }; 306 struct node_footer footer; 307 } __packed; 308 309 /* 310 * For NAT entries 311 */ 312 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry)) 313 314 struct f2fs_nat_entry { 315 __u8 version; /* latest version of cached nat entry */ 316 __le32 ino; /* inode number */ 317 __le32 block_addr; /* block address */ 318 } __packed; 319 320 struct f2fs_nat_block { 321 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 322 } __packed; 323 324 /* 325 * For SIT entries 326 * 327 * Each segment is 2MB in size by default so that a bitmap for validity of 328 * there-in blocks should occupy 64 bytes, 512 bits. 329 * Not allow to change this. 330 */ 331 #define SIT_VBLOCK_MAP_SIZE 64 332 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) 333 334 /* 335 * F2FS uses 4 bytes to represent block address. As a result, supported size of 336 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 337 */ 338 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 339 340 /* 341 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 342 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 343 * [9:0] : valid block count 344 */ 345 #define SIT_VBLOCKS_SHIFT 10 346 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 347 #define GET_SIT_VBLOCKS(raw_sit) \ 348 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 349 #define GET_SIT_TYPE(raw_sit) \ 350 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 351 >> SIT_VBLOCKS_SHIFT) 352 353 struct f2fs_sit_entry { 354 __le16 vblocks; /* reference above */ 355 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 356 __le64 mtime; /* segment age for cleaning */ 357 } __packed; 358 359 struct f2fs_sit_block { 360 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 361 } __packed; 362 363 /* 364 * For segment summary 365 * 366 * One summary block contains exactly 512 summary entries, which represents 367 * exactly 2MB segment by default. Not allow to change the basic units. 368 * 369 * NOTE: For initializing fields, you must use set_summary 370 * 371 * - If data page, nid represents dnode's nid 372 * - If node page, nid represents the node page's nid. 373 * 374 * The ofs_in_node is used by only data page. It represents offset 375 * from node's page's beginning to get a data block address. 376 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 377 */ 378 #define ENTRIES_IN_SUM 512 379 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 380 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 381 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 382 383 /* a summary entry for a 4KB-sized block in a segment */ 384 struct f2fs_summary { 385 __le32 nid; /* parent node id */ 386 union { 387 __u8 reserved[3]; 388 struct { 389 __u8 version; /* node version number */ 390 __le16 ofs_in_node; /* block index in parent node */ 391 } __packed; 392 }; 393 } __packed; 394 395 /* summary block type, node or data, is stored to the summary_footer */ 396 #define SUM_TYPE_NODE (1) 397 #define SUM_TYPE_DATA (0) 398 399 struct summary_footer { 400 unsigned char entry_type; /* SUM_TYPE_XXX */ 401 __le32 check_sum; /* summary checksum */ 402 } __packed; 403 404 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 405 SUM_ENTRY_SIZE) 406 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 407 sizeof(struct nat_journal_entry)) 408 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 409 sizeof(struct nat_journal_entry)) 410 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 411 sizeof(struct sit_journal_entry)) 412 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 413 sizeof(struct sit_journal_entry)) 414 415 /* Reserved area should make size of f2fs_extra_info equals to 416 * that of nat_journal and sit_journal. 417 */ 418 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 419 420 /* 421 * frequently updated NAT/SIT entries can be stored in the spare area in 422 * summary blocks 423 */ 424 enum { 425 NAT_JOURNAL = 0, 426 SIT_JOURNAL 427 }; 428 429 struct nat_journal_entry { 430 __le32 nid; 431 struct f2fs_nat_entry ne; 432 } __packed; 433 434 struct nat_journal { 435 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 436 __u8 reserved[NAT_JOURNAL_RESERVED]; 437 } __packed; 438 439 struct sit_journal_entry { 440 __le32 segno; 441 struct f2fs_sit_entry se; 442 } __packed; 443 444 struct sit_journal { 445 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 446 __u8 reserved[SIT_JOURNAL_RESERVED]; 447 } __packed; 448 449 struct f2fs_extra_info { 450 __le64 kbytes_written; 451 __u8 reserved[EXTRA_INFO_RESERVED]; 452 } __packed; 453 454 struct f2fs_journal { 455 union { 456 __le16 n_nats; 457 __le16 n_sits; 458 }; 459 /* spare area is used by NAT or SIT journals or extra info */ 460 union { 461 struct nat_journal nat_j; 462 struct sit_journal sit_j; 463 struct f2fs_extra_info info; 464 }; 465 } __packed; 466 467 /* 4KB-sized summary block structure */ 468 struct f2fs_summary_block { 469 struct f2fs_summary entries[ENTRIES_IN_SUM]; 470 struct f2fs_journal journal; 471 struct summary_footer footer; 472 } __packed; 473 474 /* 475 * For directory operations 476 */ 477 #define F2FS_DOT_HASH 0 478 #define F2FS_DDOT_HASH F2FS_DOT_HASH 479 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 480 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 481 482 typedef __le32 f2fs_hash_t; 483 484 /* One directory entry slot covers 8bytes-long file name */ 485 #define F2FS_SLOT_LEN 8 486 #define F2FS_SLOT_LEN_BITS 3 487 488 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 489 490 /* MAX level for dir lookup */ 491 #define MAX_DIR_HASH_DEPTH 63 492 493 /* MAX buckets in one level of dir */ 494 #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1)) 495 496 /* 497 * space utilization of regular dentry and inline dentry (w/o extra reservation) 498 * regular dentry inline dentry (def) inline dentry (min) 499 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 500 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 501 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 502 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 503 * total 4096 3488 40 504 * 505 * Note: there are more reserved space in inline dentry than in regular 506 * dentry, when converting inline dentry we should handle this carefully. 507 */ 508 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */ 509 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 510 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 511 BITS_PER_BYTE) 512 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 513 F2FS_SLOT_LEN) * \ 514 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 515 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ 516 517 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 518 struct f2fs_dir_entry { 519 __le32 hash_code; /* hash code of file name */ 520 __le32 ino; /* inode number */ 521 __le16 name_len; /* length of file name */ 522 __u8 file_type; /* file type */ 523 } __packed; 524 525 /* 4KB-sized directory entry block */ 526 struct f2fs_dentry_block { 527 /* validity bitmap for directory entries in each block */ 528 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 529 __u8 reserved[SIZE_OF_RESERVED]; 530 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 531 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 532 } __packed; 533 534 /* file types used in inode_info->flags */ 535 enum { 536 F2FS_FT_UNKNOWN, 537 F2FS_FT_REG_FILE, 538 F2FS_FT_DIR, 539 F2FS_FT_CHRDEV, 540 F2FS_FT_BLKDEV, 541 F2FS_FT_FIFO, 542 F2FS_FT_SOCK, 543 F2FS_FT_SYMLINK, 544 F2FS_FT_MAX 545 }; 546 547 #define S_SHIFT 12 548 549 #define F2FS_DEF_PROJID 0 /* default project ID */ 550 551 #endif /* _LINUX_F2FS_FS_H */ 552