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 42 #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ 43 #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */ 44 #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */ 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 struct f2fs_super_block { 76 __le32 magic; /* Magic Number */ 77 __le16 major_ver; /* Major Version */ 78 __le16 minor_ver; /* Minor Version */ 79 __le32 log_sectorsize; /* log2 sector size in bytes */ 80 __le32 log_sectors_per_block; /* log2 # of sectors per block */ 81 __le32 log_blocksize; /* log2 block size in bytes */ 82 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ 83 __le32 segs_per_sec; /* # of segments per section */ 84 __le32 secs_per_zone; /* # of sections per zone */ 85 __le32 checksum_offset; /* checksum offset inside super block */ 86 __le64 block_count; /* total # of user blocks */ 87 __le32 section_count; /* total # of sections */ 88 __le32 segment_count; /* total # of segments */ 89 __le32 segment_count_ckpt; /* # of segments for checkpoint */ 90 __le32 segment_count_sit; /* # of segments for SIT */ 91 __le32 segment_count_nat; /* # of segments for NAT */ 92 __le32 segment_count_ssa; /* # of segments for SSA */ 93 __le32 segment_count_main; /* # of segments for main area */ 94 __le32 segment0_blkaddr; /* start block address of segment 0 */ 95 __le32 cp_blkaddr; /* start block address of checkpoint */ 96 __le32 sit_blkaddr; /* start block address of SIT */ 97 __le32 nat_blkaddr; /* start block address of NAT */ 98 __le32 ssa_blkaddr; /* start block address of SSA */ 99 __le32 main_blkaddr; /* start block address of main area */ 100 __le32 root_ino; /* root inode number */ 101 __le32 node_ino; /* node inode number */ 102 __le32 meta_ino; /* meta inode number */ 103 __u8 uuid[16]; /* 128-bit uuid for volume */ 104 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ 105 __le32 extension_count; /* # of extensions below */ 106 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ 107 __le32 cp_payload; 108 __u8 version[VERSION_LEN]; /* the kernel version */ 109 __u8 init_version[VERSION_LEN]; /* the initial kernel version */ 110 __le32 feature; /* defined features */ 111 __u8 encryption_level; /* versioning level for encryption */ 112 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 113 struct f2fs_device devs[MAX_DEVICES]; /* device list */ 114 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ 115 __u8 hot_ext_count; /* # of hot file extension */ 116 __le16 s_encoding; /* Filename charset encoding */ 117 __le16 s_encoding_flags; /* Filename charset encoding flags */ 118 __u8 reserved[306]; /* valid reserved region */ 119 __le32 crc; /* checksum of superblock */ 120 } __packed; 121 122 /* 123 * For checkpoint 124 */ 125 #define CP_RESIZEFS_FLAG 0x00004000 126 #define CP_DISABLED_QUICK_FLAG 0x00002000 127 #define CP_DISABLED_FLAG 0x00001000 128 #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800 129 #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 130 #define CP_NOCRC_RECOVERY_FLAG 0x00000200 131 #define CP_TRIMMED_FLAG 0x00000100 132 #define CP_NAT_BITS_FLAG 0x00000080 133 #define CP_CRC_RECOVERY_FLAG 0x00000040 134 #define CP_FASTBOOT_FLAG 0x00000020 135 #define CP_FSCK_FLAG 0x00000010 136 #define CP_ERROR_FLAG 0x00000008 137 #define CP_COMPACT_SUM_FLAG 0x00000004 138 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 139 #define CP_UMOUNT_FLAG 0x00000001 140 141 #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ 142 143 struct f2fs_checkpoint { 144 __le64 checkpoint_ver; /* checkpoint block version number */ 145 __le64 user_block_count; /* # of user blocks */ 146 __le64 valid_block_count; /* # of valid blocks in main area */ 147 __le32 rsvd_segment_count; /* # of reserved segments for gc */ 148 __le32 overprov_segment_count; /* # of overprovision segments */ 149 __le32 free_segment_count; /* # of free segments in main area */ 150 151 /* information of current node segments */ 152 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; 153 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; 154 /* information of current data segments */ 155 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; 156 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; 157 __le32 ckpt_flags; /* Flags : umount and journal_present */ 158 __le32 cp_pack_total_block_count; /* total # of one cp pack */ 159 __le32 cp_pack_start_sum; /* start block number of data summary */ 160 __le32 valid_node_count; /* Total number of valid nodes */ 161 __le32 valid_inode_count; /* Total number of valid inodes */ 162 __le32 next_free_nid; /* Next free node number */ 163 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ 164 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ 165 __le32 checksum_offset; /* checksum offset inside cp block */ 166 __le64 elapsed_time; /* mounted time */ 167 /* allocation type of current segment */ 168 unsigned char alloc_type[MAX_ACTIVE_LOGS]; 169 170 /* SIT and NAT version bitmap */ 171 unsigned char sit_nat_version_bitmap[1]; 172 } __packed; 173 174 #define CP_CHKSUM_OFFSET 4092 /* default chksum offset in checkpoint */ 175 #define CP_MIN_CHKSUM_OFFSET \ 176 (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap)) 177 178 /* 179 * For orphan inode management 180 */ 181 #define F2FS_ORPHANS_PER_BLOCK 1020 182 183 #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ 184 F2FS_ORPHANS_PER_BLOCK) 185 186 struct f2fs_orphan_block { 187 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ 188 __le32 reserved; /* reserved */ 189 __le16 blk_addr; /* block index in current CP */ 190 __le16 blk_count; /* Number of orphan inode blocks in CP */ 191 __le32 entry_count; /* Total number of orphan nodes in current CP */ 192 __le32 check_sum; /* CRC32 for orphan inode block */ 193 } __packed; 194 195 /* 196 * For NODE structure 197 */ 198 struct f2fs_extent { 199 __le32 fofs; /* start file offset of the extent */ 200 __le32 blk; /* start block address of the extent */ 201 __le32 len; /* length of the extent */ 202 } __packed; 203 204 #define F2FS_NAME_LEN 255 205 /* 200 bytes for inline xattrs by default */ 206 #define DEFAULT_INLINE_XATTR_ADDRS 50 207 #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ 208 #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ 209 get_extra_isize(inode)) 210 #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ 211 #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) 212 #define DEF_ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ 213 #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) 214 #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ 215 216 #define ADDRS_PER_PAGE(page, inode) \ 217 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) 218 219 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) 220 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) 221 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) 222 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) 223 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) 224 225 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ 226 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ 227 #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ 228 #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ 229 #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ 230 #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ 231 #define F2FS_PIN_FILE 0x40 /* file should not be gced */ 232 #define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */ 233 234 struct f2fs_inode { 235 __le16 i_mode; /* file mode */ 236 __u8 i_advise; /* file hints */ 237 __u8 i_inline; /* file inline flags */ 238 __le32 i_uid; /* user ID */ 239 __le32 i_gid; /* group ID */ 240 __le32 i_links; /* links count */ 241 __le64 i_size; /* file size in bytes */ 242 __le64 i_blocks; /* file size in blocks */ 243 __le64 i_atime; /* access time */ 244 __le64 i_ctime; /* change time */ 245 __le64 i_mtime; /* modification time */ 246 __le32 i_atime_nsec; /* access time in nano scale */ 247 __le32 i_ctime_nsec; /* change time in nano scale */ 248 __le32 i_mtime_nsec; /* modification time in nano scale */ 249 __le32 i_generation; /* file version (for NFS) */ 250 union { 251 __le32 i_current_depth; /* only for directory depth */ 252 __le16 i_gc_failures; /* 253 * # of gc failures on pinned file. 254 * only for regular files. 255 */ 256 }; 257 __le32 i_xattr_nid; /* nid to save xattr */ 258 __le32 i_flags; /* file attributes */ 259 __le32 i_pino; /* parent inode number */ 260 __le32 i_namelen; /* file name length */ 261 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 262 __u8 i_dir_level; /* dentry_level for large dir */ 263 264 struct f2fs_extent i_ext; /* caching a largest extent */ 265 266 union { 267 struct { 268 __le16 i_extra_isize; /* extra inode attribute size */ 269 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 270 __le32 i_projid; /* project id */ 271 __le32 i_inode_checksum;/* inode meta checksum */ 272 __le64 i_crtime; /* creation time */ 273 __le32 i_crtime_nsec; /* creation time in nano scale */ 274 __le64 i_compr_blocks; /* # of compressed blocks */ 275 __u8 i_compress_algorithm; /* compress algorithm */ 276 __u8 i_log_cluster_size; /* log of cluster size */ 277 __le16 i_padding; /* padding */ 278 __le32 i_extra_end[0]; /* for attribute size calculation */ 279 } __packed; 280 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 281 }; 282 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 283 double_indirect(1) node id */ 284 } __packed; 285 286 struct direct_node { 287 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ 288 } __packed; 289 290 struct indirect_node { 291 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 292 } __packed; 293 294 enum { 295 COLD_BIT_SHIFT = 0, 296 FSYNC_BIT_SHIFT, 297 DENT_BIT_SHIFT, 298 OFFSET_BIT_SHIFT 299 }; 300 301 #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */ 302 303 struct node_footer { 304 __le32 nid; /* node id */ 305 __le32 ino; /* inode number */ 306 __le32 flag; /* include cold/fsync/dentry marks and offset */ 307 __le64 cp_ver; /* checkpoint version */ 308 __le32 next_blkaddr; /* next node page block address */ 309 } __packed; 310 311 struct f2fs_node { 312 /* can be one of three types: inode, direct, and indirect types */ 313 union { 314 struct f2fs_inode i; 315 struct direct_node dn; 316 struct indirect_node in; 317 }; 318 struct node_footer footer; 319 } __packed; 320 321 /* 322 * For NAT entries 323 */ 324 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry)) 325 326 struct f2fs_nat_entry { 327 __u8 version; /* latest version of cached nat entry */ 328 __le32 ino; /* inode number */ 329 __le32 block_addr; /* block address */ 330 } __packed; 331 332 struct f2fs_nat_block { 333 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 334 } __packed; 335 336 /* 337 * For SIT entries 338 * 339 * Each segment is 2MB in size by default so that a bitmap for validity of 340 * there-in blocks should occupy 64 bytes, 512 bits. 341 * Not allow to change this. 342 */ 343 #define SIT_VBLOCK_MAP_SIZE 64 344 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) 345 346 /* 347 * F2FS uses 4 bytes to represent block address. As a result, supported size of 348 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 349 */ 350 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 351 352 /* 353 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 354 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 355 * [9:0] : valid block count 356 */ 357 #define SIT_VBLOCKS_SHIFT 10 358 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 359 #define GET_SIT_VBLOCKS(raw_sit) \ 360 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 361 #define GET_SIT_TYPE(raw_sit) \ 362 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 363 >> SIT_VBLOCKS_SHIFT) 364 365 struct f2fs_sit_entry { 366 __le16 vblocks; /* reference above */ 367 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 368 __le64 mtime; /* segment age for cleaning */ 369 } __packed; 370 371 struct f2fs_sit_block { 372 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 373 } __packed; 374 375 /* 376 * For segment summary 377 * 378 * One summary block contains exactly 512 summary entries, which represents 379 * exactly 2MB segment by default. Not allow to change the basic units. 380 * 381 * NOTE: For initializing fields, you must use set_summary 382 * 383 * - If data page, nid represents dnode's nid 384 * - If node page, nid represents the node page's nid. 385 * 386 * The ofs_in_node is used by only data page. It represents offset 387 * from node's page's beginning to get a data block address. 388 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 389 */ 390 #define ENTRIES_IN_SUM 512 391 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 392 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 393 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 394 395 /* a summary entry for a 4KB-sized block in a segment */ 396 struct f2fs_summary { 397 __le32 nid; /* parent node id */ 398 union { 399 __u8 reserved[3]; 400 struct { 401 __u8 version; /* node version number */ 402 __le16 ofs_in_node; /* block index in parent node */ 403 } __packed; 404 }; 405 } __packed; 406 407 /* summary block type, node or data, is stored to the summary_footer */ 408 #define SUM_TYPE_NODE (1) 409 #define SUM_TYPE_DATA (0) 410 411 struct summary_footer { 412 unsigned char entry_type; /* SUM_TYPE_XXX */ 413 __le32 check_sum; /* summary checksum */ 414 } __packed; 415 416 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 417 SUM_ENTRY_SIZE) 418 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 419 sizeof(struct nat_journal_entry)) 420 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 421 sizeof(struct nat_journal_entry)) 422 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 423 sizeof(struct sit_journal_entry)) 424 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 425 sizeof(struct sit_journal_entry)) 426 427 /* Reserved area should make size of f2fs_extra_info equals to 428 * that of nat_journal and sit_journal. 429 */ 430 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 431 432 /* 433 * frequently updated NAT/SIT entries can be stored in the spare area in 434 * summary blocks 435 */ 436 enum { 437 NAT_JOURNAL = 0, 438 SIT_JOURNAL 439 }; 440 441 struct nat_journal_entry { 442 __le32 nid; 443 struct f2fs_nat_entry ne; 444 } __packed; 445 446 struct nat_journal { 447 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 448 __u8 reserved[NAT_JOURNAL_RESERVED]; 449 } __packed; 450 451 struct sit_journal_entry { 452 __le32 segno; 453 struct f2fs_sit_entry se; 454 } __packed; 455 456 struct sit_journal { 457 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 458 __u8 reserved[SIT_JOURNAL_RESERVED]; 459 } __packed; 460 461 struct f2fs_extra_info { 462 __le64 kbytes_written; 463 __u8 reserved[EXTRA_INFO_RESERVED]; 464 } __packed; 465 466 struct f2fs_journal { 467 union { 468 __le16 n_nats; 469 __le16 n_sits; 470 }; 471 /* spare area is used by NAT or SIT journals or extra info */ 472 union { 473 struct nat_journal nat_j; 474 struct sit_journal sit_j; 475 struct f2fs_extra_info info; 476 }; 477 } __packed; 478 479 /* 4KB-sized summary block structure */ 480 struct f2fs_summary_block { 481 struct f2fs_summary entries[ENTRIES_IN_SUM]; 482 struct f2fs_journal journal; 483 struct summary_footer footer; 484 } __packed; 485 486 /* 487 * For directory operations 488 */ 489 #define F2FS_DOT_HASH 0 490 #define F2FS_DDOT_HASH F2FS_DOT_HASH 491 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 492 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 493 494 typedef __le32 f2fs_hash_t; 495 496 /* One directory entry slot covers 8bytes-long file name */ 497 #define F2FS_SLOT_LEN 8 498 #define F2FS_SLOT_LEN_BITS 3 499 500 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 501 502 /* MAX level for dir lookup */ 503 #define MAX_DIR_HASH_DEPTH 63 504 505 /* MAX buckets in one level of dir */ 506 #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1)) 507 508 /* 509 * space utilization of regular dentry and inline dentry (w/o extra reservation) 510 * regular dentry inline dentry (def) inline dentry (min) 511 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 512 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 513 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 514 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 515 * total 4096 3488 40 516 * 517 * Note: there are more reserved space in inline dentry than in regular 518 * dentry, when converting inline dentry we should handle this carefully. 519 */ 520 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */ 521 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 522 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 523 BITS_PER_BYTE) 524 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 525 F2FS_SLOT_LEN) * \ 526 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 527 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ 528 529 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 530 struct f2fs_dir_entry { 531 __le32 hash_code; /* hash code of file name */ 532 __le32 ino; /* inode number */ 533 __le16 name_len; /* length of file name */ 534 __u8 file_type; /* file type */ 535 } __packed; 536 537 /* 4KB-sized directory entry block */ 538 struct f2fs_dentry_block { 539 /* validity bitmap for directory entries in each block */ 540 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 541 __u8 reserved[SIZE_OF_RESERVED]; 542 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 543 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 544 } __packed; 545 546 /* file types used in inode_info->flags */ 547 enum { 548 F2FS_FT_UNKNOWN, 549 F2FS_FT_REG_FILE, 550 F2FS_FT_DIR, 551 F2FS_FT_CHRDEV, 552 F2FS_FT_BLKDEV, 553 F2FS_FT_FIFO, 554 F2FS_FT_SOCK, 555 F2FS_FT_SYMLINK, 556 F2FS_FT_MAX 557 }; 558 559 #define S_SHIFT 12 560 561 #define F2FS_DEF_PROJID 0 /* default project ID */ 562 563 #endif /* _LINUX_F2FS_FS_H */ 564