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 */ 232 233 struct f2fs_inode { 234 __le16 i_mode; /* file mode */ 235 __u8 i_advise; /* file hints */ 236 __u8 i_inline; /* file inline flags */ 237 __le32 i_uid; /* user ID */ 238 __le32 i_gid; /* group ID */ 239 __le32 i_links; /* links count */ 240 __le64 i_size; /* file size in bytes */ 241 __le64 i_blocks; /* file size in blocks */ 242 __le64 i_atime; /* access time */ 243 __le64 i_ctime; /* change time */ 244 __le64 i_mtime; /* modification time */ 245 __le32 i_atime_nsec; /* access time in nano scale */ 246 __le32 i_ctime_nsec; /* change time in nano scale */ 247 __le32 i_mtime_nsec; /* modification time in nano scale */ 248 __le32 i_generation; /* file version (for NFS) */ 249 union { 250 __le32 i_current_depth; /* only for directory depth */ 251 __le16 i_gc_failures; /* 252 * # of gc failures on pinned file. 253 * only for regular files. 254 */ 255 }; 256 __le32 i_xattr_nid; /* nid to save xattr */ 257 __le32 i_flags; /* file attributes */ 258 __le32 i_pino; /* parent inode number */ 259 __le32 i_namelen; /* file name length */ 260 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ 261 __u8 i_dir_level; /* dentry_level for large dir */ 262 263 struct f2fs_extent i_ext; /* caching a largest extent */ 264 265 union { 266 struct { 267 __le16 i_extra_isize; /* extra inode attribute size */ 268 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ 269 __le32 i_projid; /* project id */ 270 __le32 i_inode_checksum;/* inode meta checksum */ 271 __le64 i_crtime; /* creation time */ 272 __le32 i_crtime_nsec; /* creation time in nano scale */ 273 __le64 i_compr_blocks; /* # of compressed blocks */ 274 __u8 i_compress_algorithm; /* compress algorithm */ 275 __u8 i_log_cluster_size; /* log of cluster size */ 276 __le16 i_padding; /* padding */ 277 __le32 i_extra_end[0]; /* for attribute size calculation */ 278 } __packed; 279 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ 280 }; 281 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), 282 double_indirect(1) node id */ 283 } __packed; 284 285 struct direct_node { 286 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ 287 } __packed; 288 289 struct indirect_node { 290 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ 291 } __packed; 292 293 enum { 294 COLD_BIT_SHIFT = 0, 295 FSYNC_BIT_SHIFT, 296 DENT_BIT_SHIFT, 297 OFFSET_BIT_SHIFT 298 }; 299 300 #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */ 301 302 struct node_footer { 303 __le32 nid; /* node id */ 304 __le32 ino; /* inode number */ 305 __le32 flag; /* include cold/fsync/dentry marks and offset */ 306 __le64 cp_ver; /* checkpoint version */ 307 __le32 next_blkaddr; /* next node page block address */ 308 } __packed; 309 310 struct f2fs_node { 311 /* can be one of three types: inode, direct, and indirect types */ 312 union { 313 struct f2fs_inode i; 314 struct direct_node dn; 315 struct indirect_node in; 316 }; 317 struct node_footer footer; 318 } __packed; 319 320 /* 321 * For NAT entries 322 */ 323 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry)) 324 325 struct f2fs_nat_entry { 326 __u8 version; /* latest version of cached nat entry */ 327 __le32 ino; /* inode number */ 328 __le32 block_addr; /* block address */ 329 } __packed; 330 331 struct f2fs_nat_block { 332 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; 333 } __packed; 334 335 /* 336 * For SIT entries 337 * 338 * Each segment is 2MB in size by default so that a bitmap for validity of 339 * there-in blocks should occupy 64 bytes, 512 bits. 340 * Not allow to change this. 341 */ 342 #define SIT_VBLOCK_MAP_SIZE 64 343 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) 344 345 /* 346 * F2FS uses 4 bytes to represent block address. As a result, supported size of 347 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. 348 */ 349 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) 350 351 /* 352 * Note that f2fs_sit_entry->vblocks has the following bit-field information. 353 * [15:10] : allocation type such as CURSEG_XXXX_TYPE 354 * [9:0] : valid block count 355 */ 356 #define SIT_VBLOCKS_SHIFT 10 357 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) 358 #define GET_SIT_VBLOCKS(raw_sit) \ 359 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) 360 #define GET_SIT_TYPE(raw_sit) \ 361 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ 362 >> SIT_VBLOCKS_SHIFT) 363 364 struct f2fs_sit_entry { 365 __le16 vblocks; /* reference above */ 366 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ 367 __le64 mtime; /* segment age for cleaning */ 368 } __packed; 369 370 struct f2fs_sit_block { 371 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; 372 } __packed; 373 374 /* 375 * For segment summary 376 * 377 * One summary block contains exactly 512 summary entries, which represents 378 * exactly 2MB segment by default. Not allow to change the basic units. 379 * 380 * NOTE: For initializing fields, you must use set_summary 381 * 382 * - If data page, nid represents dnode's nid 383 * - If node page, nid represents the node page's nid. 384 * 385 * The ofs_in_node is used by only data page. It represents offset 386 * from node's page's beginning to get a data block address. 387 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) 388 */ 389 #define ENTRIES_IN_SUM 512 390 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ 391 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ 392 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) 393 394 /* a summary entry for a 4KB-sized block in a segment */ 395 struct f2fs_summary { 396 __le32 nid; /* parent node id */ 397 union { 398 __u8 reserved[3]; 399 struct { 400 __u8 version; /* node version number */ 401 __le16 ofs_in_node; /* block index in parent node */ 402 } __packed; 403 }; 404 } __packed; 405 406 /* summary block type, node or data, is stored to the summary_footer */ 407 #define SUM_TYPE_NODE (1) 408 #define SUM_TYPE_DATA (0) 409 410 struct summary_footer { 411 unsigned char entry_type; /* SUM_TYPE_XXX */ 412 __le32 check_sum; /* summary checksum */ 413 } __packed; 414 415 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ 416 SUM_ENTRY_SIZE) 417 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 418 sizeof(struct nat_journal_entry)) 419 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 420 sizeof(struct nat_journal_entry)) 421 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ 422 sizeof(struct sit_journal_entry)) 423 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ 424 sizeof(struct sit_journal_entry)) 425 426 /* Reserved area should make size of f2fs_extra_info equals to 427 * that of nat_journal and sit_journal. 428 */ 429 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) 430 431 /* 432 * frequently updated NAT/SIT entries can be stored in the spare area in 433 * summary blocks 434 */ 435 enum { 436 NAT_JOURNAL = 0, 437 SIT_JOURNAL 438 }; 439 440 struct nat_journal_entry { 441 __le32 nid; 442 struct f2fs_nat_entry ne; 443 } __packed; 444 445 struct nat_journal { 446 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; 447 __u8 reserved[NAT_JOURNAL_RESERVED]; 448 } __packed; 449 450 struct sit_journal_entry { 451 __le32 segno; 452 struct f2fs_sit_entry se; 453 } __packed; 454 455 struct sit_journal { 456 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; 457 __u8 reserved[SIT_JOURNAL_RESERVED]; 458 } __packed; 459 460 struct f2fs_extra_info { 461 __le64 kbytes_written; 462 __u8 reserved[EXTRA_INFO_RESERVED]; 463 } __packed; 464 465 struct f2fs_journal { 466 union { 467 __le16 n_nats; 468 __le16 n_sits; 469 }; 470 /* spare area is used by NAT or SIT journals or extra info */ 471 union { 472 struct nat_journal nat_j; 473 struct sit_journal sit_j; 474 struct f2fs_extra_info info; 475 }; 476 } __packed; 477 478 /* 4KB-sized summary block structure */ 479 struct f2fs_summary_block { 480 struct f2fs_summary entries[ENTRIES_IN_SUM]; 481 struct f2fs_journal journal; 482 struct summary_footer footer; 483 } __packed; 484 485 /* 486 * For directory operations 487 */ 488 #define F2FS_DOT_HASH 0 489 #define F2FS_DDOT_HASH F2FS_DOT_HASH 490 #define F2FS_MAX_HASH (~((0x3ULL) << 62)) 491 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) 492 493 typedef __le32 f2fs_hash_t; 494 495 /* One directory entry slot covers 8bytes-long file name */ 496 #define F2FS_SLOT_LEN 8 497 #define F2FS_SLOT_LEN_BITS 3 498 499 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) 500 501 /* MAX level for dir lookup */ 502 #define MAX_DIR_HASH_DEPTH 63 503 504 /* MAX buckets in one level of dir */ 505 #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1)) 506 507 /* 508 * space utilization of regular dentry and inline dentry (w/o extra reservation) 509 * regular dentry inline dentry (def) inline dentry (min) 510 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 511 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 512 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 513 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 514 * total 4096 3488 40 515 * 516 * Note: there are more reserved space in inline dentry than in regular 517 * dentry, when converting inline dentry we should handle this carefully. 518 */ 519 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */ 520 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ 521 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ 522 BITS_PER_BYTE) 523 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ 524 F2FS_SLOT_LEN) * \ 525 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) 526 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ 527 528 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ 529 struct f2fs_dir_entry { 530 __le32 hash_code; /* hash code of file name */ 531 __le32 ino; /* inode number */ 532 __le16 name_len; /* length of file name */ 533 __u8 file_type; /* file type */ 534 } __packed; 535 536 /* 4KB-sized directory entry block */ 537 struct f2fs_dentry_block { 538 /* validity bitmap for directory entries in each block */ 539 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; 540 __u8 reserved[SIZE_OF_RESERVED]; 541 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; 542 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; 543 } __packed; 544 545 /* file types used in inode_info->flags */ 546 enum { 547 F2FS_FT_UNKNOWN, 548 F2FS_FT_REG_FILE, 549 F2FS_FT_DIR, 550 F2FS_FT_CHRDEV, 551 F2FS_FT_BLKDEV, 552 F2FS_FT_FIFO, 553 F2FS_FT_SOCK, 554 F2FS_FT_SYMLINK, 555 F2FS_FT_MAX 556 }; 557 558 #define S_SHIFT 12 559 560 #define F2FS_DEF_PROJID 0 /* default project ID */ 561 562 #endif /* _LINUX_F2FS_FS_H */ 563
