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 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 38 #define F2FS_MAX_QUOTAS 3 39 40 #define F2FS_ENC_UTF8_12_1 1 41 #define F2FS_ENC_STRICT_MODE_FL (1 << 0) 42 #define f2fs_has_strict_mode(sbi) \ 43 (sbi->s_encoding_flags & F2FS_ENC_STRICT_MODE_FL) 44 45 #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ 46 #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */ 47 #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */ 48 #define F2FS_IO_SIZE_BITS(sbi) (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */ 49 #define F2FS_IO_SIZE_MASK(sbi) (F2FS_IO_SIZE(sbi) - 1) 50 #define F2FS_IO_ALIGNED(sbi) (F2FS_IO_SIZE(sbi) > 1) 51 52 /* This flag is used by node and meta inodes, and by recovery */ 53 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) 54 55 /* 56 * For further optimization on multi-head logs, on-disk layout supports maximum 57 * 16 logs by default. The number, 16, is expected to cover all the cases 58 * enoughly. The implementaion currently uses no more than 6 logs. 59 * Half the logs are used for nodes, and the other half are used for data. 60 */ 61 #define MAX_ACTIVE_LOGS 16 62 #define MAX_ACTIVE_NODE_LOGS 8 63 #define MAX_ACTIVE_DATA_LOGS 8 64 65 #define VERSION_LEN 256 66 #define MAX_VOLUME_NAME 512 67 #define MAX_PATH_LEN 64 68 #define MAX_DEVICES 8 69 70 /* 71 * For superblock 72 */ 73 struct f2fs_device { 74 __u8 path[MAX_PATH_LEN]; 75 __le32 total_segments; 76 } __packed; 77 78 struct f2fs_super_block { 79 __le32 magic; /* Magic Number */ 80 __le16 major_ver; /* Major Version */ 81 __le16 minor_ver; /* Minor Version */ 82 __le32 log_sectorsize; /* log2 sector size in bytes */ 83 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 84 __le32 log_blocksize; /* log2 block size in bytes */ 85 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 86 __le32 segs_per_sec; /* # of segments per section */ 87 __le32 secs_per_zone; /* # of sections per zone */ 88 __le32 checksum_offset; /* checksum offset inside super block */ 89 __le64 block_count; /* total # of user blocks */ 90 __le32 section_count; /* total # of sections */ 91 __le32 segment_count; /* total # of segments */ 92 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 93 __le32 segment_count_sit; /* # of segments for SIT */ 94 __le32 segment_count_nat; /* # of segments for NAT */ 95 __le32 segment_count_ssa; /* # of segments for SSA */ 96 __le32 segment_count_main; /* # of segments for main area */ 97 __le32 segment0_blkaddr; /* start block address of segment 0 */ 98 __le32 cp_blkaddr; /* start block address of checkpoint */ 99 __le32 sit_blkaddr; /* start block address of SIT */ 100 __le32 nat_blkaddr; /* start block address of NAT */ 101 __le32 ssa_blkaddr; /* start block address of SSA */ 102 __le32 main_blkaddr; /* start block address of main area */ 103 __le32 root_ino; /* root inode number */ 104 __le32 node_ino; /* node inode number */ 105 __le32 meta_ino; /* meta inode number */ 106 __u8 uuid[16]; /* 128-bit uuid for volume */ 107 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ 108 __le32 extension_count; /* # of extensions below */ 109 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ 110 __le32 cp_payload; 111 __u8 version[VERSION_LEN]; /* the kernel version */ 112 __u8 init_version[VERSION_LEN]; /* the initial kernel version */ 113 __le32 feature; /* defined features */ 114 __u8 encryption_level; /* versioning level for encryption */ 115 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 116 struct f2fs_device devs[MAX_DEVICES]; /* device list */ 117 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ 118 __u8 hot_ext_count; /* # of hot file extension */ 119 __le16 s_encoding; /* Filename charset encoding */ 120 __le16 s_encoding_flags; /* Filename charset encoding flags */ 121 __u8 reserved[306]; /* valid reserved region */ 122 __le32 crc; /* checksum of superblock */ 123 } __packed; 124 125 /* 126 * For checkpoint 127 */ 128 #define CP_DISABLED_QUICK_FLAG 0x00002000 129 #define CP_DISABLED_FLAG 0x00001000 130 #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800 131 #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 132 #define CP_NOCRC_RECOVERY_FLAG 0x00000200 133 #define CP_TRIMMED_FLAG 0x00000100 134 #define CP_NAT_BITS_FLAG 0x00000080 135 #define CP_CRC_RECOVERY_FLAG 0x00000040 136 #define CP_FASTBOOT_FLAG 0x00000020 137 #define CP_FSCK_FLAG 0x00000010 138 #define CP_ERROR_FLAG 0x00000008 139 #define CP_COMPACT_SUM_FLAG 0x00000004 140 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 141 #define CP_UMOUNT_FLAG 0x00000001 142 143 #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ 144 145 struct f2fs_checkpoint { 146 __le64 checkpoint_ver; /* checkpoint block version number */ 147 __le64 user_block_count; /* # of user blocks */ 148 __le64 valid_block_count; /* # of valid blocks in main area */ 149 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 150 __le32 overprov_segment_count; /* # of overprovision segments */ 151 __le32 free_segment_count; /* # of free segments in main area */ 152 153 /* information of current node segments */ 154 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 155 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 156 /* information of current data segments */ 157 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 158 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 159 __le32 ckpt_flags; /* Flags : umount and journal_present */ 160 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 161 __le32 cp_pack_start_sum; /* start block number of data summary */ 162 __le32 valid_node_count; /* Total number of valid nodes */ 163 __le32 valid_inode_count; /* Total number of valid inodes */ 164 __le32 next_free_nid; /* Next free node number */ 165 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 166 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 167 __le32 checksum_offset; /* checksum offset inside cp block */ 168 __le64 elapsed_time; /* mounted time */ 169 /* allocation type of current segment */ 170 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 171 172 /* SIT and NAT version bitmap */ 173 unsigned char sit_nat_version_bitmap[1]; 174 } __packed; 175 176 #define CP_CHKSUM_OFFSET 4092 /* default chksum offset in checkpoint */ 177 #define CP_MIN_CHKSUM_OFFSET \ 178 (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap)) 179 180 /* 181 * For orphan inode management 182 */ 183 #define F2FS_ORPHANS_PER_BLOCK 1020 184 185 #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ 186 F2FS_ORPHANS_PER_BLOCK) 187 188 struct f2fs_orphan_block { 189 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 190 __le32 reserved; /* reserved */ 191 __le16 blk_addr; /* block index in current CP */ 192 __le16 blk_count; /* Number of orphan inode blocks in CP */ 193 __le32 entry_count; /* Total number of orphan nodes in current CP */ 194 __le32 check_sum; /* CRC32 for orphan inode block */ 195 } __packed; 196 197 /* 198 * For NODE structure 199 */ 200 struct f2fs_extent { 201 __le32 fofs; /* start file offset of the extent */ 202 __le32 blk; /* start block address of the extent */ 203 __le32 len; /* length of the extent */ 204 } __packed; 205 206 #define F2FS_NAME_LEN 255 207 /* 200 bytes for inline xattrs by default */ 208 #define DEFAULT_INLINE_XATTR_ADDRS 50 209 #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ 210 #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ 211 get_extra_isize(inode)) 212 #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ 213 #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) 214 #define DEF_ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ 215 #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) 216 #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ 217 218 #define ADDRS_PER_PAGE(page, inode) \ 219 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) 220 221 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 222 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 223 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 224 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 225 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 226 227 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 228 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 229 #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ 230 #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ 231 #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ 232 #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ 233 #define F2FS_PIN_FILE 0x40 /* file should not be gced */ 234 235 struct f2fs_inode { 236 __le16 i_mode; /* file mode */ 237 __u8 i_advise; /* file hints */ 238 __u8 i_inline; /* file inline flags */ 239 __le32 i_uid; /* user ID */ 240 __le32 i_gid; /* group ID */ 241 __le32 i_links; /* links count */ 242 __le64 i_size; /* file size in bytes */ 243 __le64 i_blocks; /* file size in blocks */ 244 __le64 i_atime; /* access time */ 245 __le64 i_ctime; /* change time */ 246 __le64 i_mtime; /* modification time */ 247 __le32 i_atime_nsec; /* access time in nano scale */ 248 __le32 i_ctime_nsec; /* change time in nano scale */ 249 __le32 i_mtime_nsec; /* modification time in nano scale */ 250 __le32 i_generation; /* file version (for NFS) */ 251 union { 252 __le32 i_current_depth; /* only for directory depth */ 253 __le16 i_gc_failures; /* 254 * # of gc failures on pinned file. 255 * only for regular files. 256 */ 257 }; 258 __le32 i_xattr_nid; /* nid to save xattr */ 259 __le32 i_flags; /* file attributes */ 260 __le32 i_pino; /* parent inode number */ 261 __le32 i_namelen; /* file name length */ 262 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 263 __u8 i_dir_level; /* dentry_level for large dir */ 264 265 struct f2fs_extent i_ext; /* caching a largest extent */ 266 267 union { 268 struct { 269 __le16 i_extra_isize; /* extra inode attribute size */ 270 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 271 __le32 i_projid; /* project id */ 272 __le32 i_inode_checksum;/* inode meta checksum */ 273 __le64 i_crtime; /* creation time */ 274 __le32 i_crtime_nsec; /* creation time in nano scale */ 275 __le64 i_compr_blocks; /* # of compressed blocks */ 276 __u8 i_compress_algorithm; /* compress algorithm */ 277 __u8 i_log_cluster_size; /* log of cluster size */ 278 __le16 i_padding; /* padding */ 279 __le32 i_extra_end[0]; /* for attribute size calculation */ 280 } __packed; 281 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 282 }; 283 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 284 double_indirect(1) node id */ 285 } __packed; 286 287 struct direct_node { 288 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ 289 } __packed; 290 291 struct indirect_node { 292 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 293 } __packed; 294 295 enum { 296 COLD_BIT_SHIFT = 0, 297 FSYNC_BIT_SHIFT, 298 DENT_BIT_SHIFT, 299 OFFSET_BIT_SHIFT 300 }; 301 302 #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */ 303 304 struct node_footer { 305 __le32 nid; /* node id */ 306 __le32 ino; /* inode number */ 307 __le32 flag; /* include cold/fsync/dentry marks and offset */ 308 __le64 cp_ver; /* checkpoint version */ 309 __le32 next_blkaddr; /* next node page block address */ 310 } __packed; 311 312 struct f2fs_node { 313 /* can be one of three types: inode, direct, and indirect types */ 314 union { 315 struct f2fs_inode i; 316 struct direct_node dn; 317 struct indirect_node in; 318 }; 319 struct node_footer footer; 320 } __packed; 321 322 /* 323 * For NAT entries 324 */ 325 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry)) 326 327 struct f2fs_nat_entry { 328 __u8 version; /* latest version of cached nat entry */ 329 __le32 ino; /* inode number */ 330 __le32 block_addr; /* block address */ 331 } __packed; 332 333 struct f2fs_nat_block { 334 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 335 } __packed; 336 337 /* 338 * For SIT entries 339 * 340 * Each segment is 2MB in size by default so that a bitmap for validity of 341 * there-in blocks should occupy 64 bytes, 512 bits. 342 * Not allow to change this. 343 */ 344 #define SIT_VBLOCK_MAP_SIZE 64 345 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) 346 347 /* 348 * F2FS uses 4 bytes to represent block address. As a result, supported size of 349 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 350 */ 351 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 352 353 /* 354 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 355 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 356 * [9:0] : valid block count 357 */ 358 #define SIT_VBLOCKS_SHIFT 10 359 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 360 #define GET_SIT_VBLOCKS(raw_sit) \ 361 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 362 #define GET_SIT_TYPE(raw_sit) \ 363 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 364 >> SIT_VBLOCKS_SHIFT) 365 366 struct f2fs_sit_entry { 367 __le16 vblocks; /* reference above */ 368 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 369 __le64 mtime; /* segment age for cleaning */ 370 } __packed; 371 372 struct f2fs_sit_block { 373 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 374 } __packed; 375 376 /* 377 * For segment summary 378 * 379 * One summary block contains exactly 512 summary entries, which represents 380 * exactly 2MB segment by default. Not allow to change the basic units. 381 * 382 * NOTE: For initializing fields, you must use set_summary 383 * 384 * - If data page, nid represents dnode's nid 385 * - If node page, nid represents the node page's nid. 386 * 387 * The ofs_in_node is used by only data page. It represents offset 388 * from node's page's beginning to get a data block address. 389 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 390 */ 391 #define ENTRIES_IN_SUM 512 392 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 393 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 394 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 395 396 /* a summary entry for a 4KB-sized block in a segment */ 397 struct f2fs_summary { 398 __le32 nid; /* parent node id */ 399 union { 400 __u8 reserved[3]; 401 struct { 402 __u8 version; /* node version number */ 403 __le16 ofs_in_node; /* block index in parent node */ 404 } __packed; 405 }; 406 } __packed; 407 408 /* summary block type, node or data, is stored to the summary_footer */ 409 #define SUM_TYPE_NODE (1) 410 #define SUM_TYPE_DATA (0) 411 412 struct summary_footer { 413 unsigned char entry_type; /* SUM_TYPE_XXX */ 414 __le32 check_sum; /* summary checksum */ 415 } __packed; 416 417 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 418 SUM_ENTRY_SIZE) 419 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 420 sizeof(struct nat_journal_entry)) 421 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 422 sizeof(struct nat_journal_entry)) 423 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 424 sizeof(struct sit_journal_entry)) 425 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 426 sizeof(struct sit_journal_entry)) 427 428 /* Reserved area should make size of f2fs_extra_info equals to 429 * that of nat_journal and sit_journal. 430 */ 431 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 432 433 /* 434 * frequently updated NAT/SIT entries can be stored in the spare area in 435 * summary blocks 436 */ 437 enum { 438 NAT_JOURNAL = 0, 439 SIT_JOURNAL 440 }; 441 442 struct nat_journal_entry { 443 __le32 nid; 444 struct f2fs_nat_entry ne; 445 } __packed; 446 447 struct nat_journal { 448 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 449 __u8 reserved[NAT_JOURNAL_RESERVED]; 450 } __packed; 451 452 struct sit_journal_entry { 453 __le32 segno; 454 struct f2fs_sit_entry se; 455 } __packed; 456 457 struct sit_journal { 458 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 459 __u8 reserved[SIT_JOURNAL_RESERVED]; 460 } __packed; 461 462 struct f2fs_extra_info { 463 __le64 kbytes_written; 464 __u8 reserved[EXTRA_INFO_RESERVED]; 465 } __packed; 466 467 struct f2fs_journal { 468 union { 469 __le16 n_nats; 470 __le16 n_sits; 471 }; 472 /* spare area is used by NAT or SIT journals or extra info */ 473 union { 474 struct nat_journal nat_j; 475 struct sit_journal sit_j; 476 struct f2fs_extra_info info; 477 }; 478 } __packed; 479 480 /* 4KB-sized summary block structure */ 481 struct f2fs_summary_block { 482 struct f2fs_summary entries[ENTRIES_IN_SUM]; 483 struct f2fs_journal journal; 484 struct summary_footer footer; 485 } __packed; 486 487 /* 488 * For directory operations 489 */ 490 #define F2FS_DOT_HASH 0 491 #define F2FS_DDOT_HASH F2FS_DOT_HASH 492 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 493 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 494 495 typedef __le32 f2fs_hash_t; 496 497 /* One directory entry slot covers 8bytes-long file name */ 498 #define F2FS_SLOT_LEN 8 499 #define F2FS_SLOT_LEN_BITS 3 500 501 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 502 503 /* MAX level for dir lookup */ 504 #define MAX_DIR_HASH_DEPTH 63 505 506 /* MAX buckets in one level of dir */ 507 #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1)) 508 509 /* 510 * space utilization of regular dentry and inline dentry (w/o extra reservation) 511 * regular dentry inline dentry (def) inline dentry (min) 512 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 513 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 514 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 515 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 516 * total 4096 3488 40 517 * 518 * Note: there are more reserved space in inline dentry than in regular 519 * dentry, when converting inline dentry we should handle this carefully. 520 */ 521 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */ 522 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 523 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 524 BITS_PER_BYTE) 525 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 526 F2FS_SLOT_LEN) * \ 527 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 528 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ 529 530 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 531 struct f2fs_dir_entry { 532 __le32 hash_code; /* hash code of file name */ 533 __le32 ino; /* inode number */ 534 __le16 name_len; /* length of file name */ 535 __u8 file_type; /* file type */ 536 } __packed; 537 538 /* 4KB-sized directory entry block */ 539 struct f2fs_dentry_block { 540 /* validity bitmap for directory entries in each block */ 541 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 542 __u8 reserved[SIZE_OF_RESERVED]; 543 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 544 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 545 } __packed; 546 547 /* file types used in inode_info->flags */ 548 enum { 549 F2FS_FT_UNKNOWN, 550 F2FS_FT_REG_FILE, 551 F2FS_FT_DIR, 552 F2FS_FT_CHRDEV, 553 F2FS_FT_BLKDEV, 554 F2FS_FT_FIFO, 555 F2FS_FT_SOCK, 556 F2FS_FT_SYMLINK, 557 F2FS_FT_MAX 558 }; 559 560 #define S_SHIFT 12 561 562 #define F2FS_DEF_PROJID 0 /* default project ID */ 563 564 #endif /* _LINUX_F2FS_FS_H */ 565