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_ENC_UTF8_12_1 1
40 #define F2FS_ENC_STRICT_MODE_FL (1 << 0)
41 #define f2fs_has_strict_mode(sbi) \
42 (sbi->s_encoding_flags & F2FS_ENC_STRICT_MODE_FL)
43
44 #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */
45 #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */
46 #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */
47 #define F2FS_IO_SIZE_BITS(sbi) (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */
48 #define F2FS_IO_SIZE_MASK(sbi) (F2FS_IO_SIZE(sbi) - 1)
49 #define F2FS_IO_ALIGNED(sbi) (F2FS_IO_SIZE(sbi) > 1)
50
51 /* This flag is used by node and meta inodes, and by recovery */
52 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO)
53
54 /*
55 * For further optimization on multi-head logs, on-disk layout supports maximum
56 * 16 logs by default. The number, 16, is expected to cover all the cases
57 * enoughly. The implementaion currently uses no more than 6 logs.
58 * Half the logs are used for nodes, and the other half are used for data.
59 */
60 #define MAX_ACTIVE_LOGS 16
61 #define MAX_ACTIVE_NODE_LOGS 8
62 #define MAX_ACTIVE_DATA_LOGS 8
63
64 #define VERSION_LEN 256
65 #define MAX_VOLUME_NAME 512
66 #define MAX_PATH_LEN 64
67 #define MAX_DEVICES 8
68
69 /*
70 * For superblock
71 */
72 struct f2fs_device {
73 __u8 path[MAX_PATH_LEN];
74 __le32 total_segments;
75 } __packed;
76
77 struct f2fs_super_block {
78 __le32 magic; /* Magic Number */
79 __le16 major_ver; /* Major Version */
80 __le16 minor_ver; /* Minor Version */
81 __le32 log_sectorsize; /* log2 sector size in bytes */
82 __le32 log_sectors_per_block; /* log2 # of sectors per block */
83 __le32 log_blocksize; /* log2 block size in bytes */
84 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */
85 __le32 segs_per_sec; /* # of segments per section */
86 __le32 secs_per_zone; /* # of sections per zone */
87 __le32 checksum_offset; /* checksum offset inside super block */
88 __le64 block_count; /* total # of user blocks */
89 __le32 section_count; /* total # of sections */
90 __le32 segment_count; /* total # of segments */
91 __le32 segment_count_ckpt; /* # of segments for checkpoint */
92 __le32 segment_count_sit; /* # of segments for SIT */
93 __le32 segment_count_nat; /* # of segments for NAT */
94 __le32 segment_count_ssa; /* # of segments for SSA */
95 __le32 segment_count_main; /* # of segments for main area */
96 __le32 segment0_blkaddr; /* start block address of segment 0 */
97 __le32 cp_blkaddr; /* start block address of checkpoint */
98 __le32 sit_blkaddr; /* start block address of SIT */
99 __le32 nat_blkaddr; /* start block address of NAT */
100 __le32 ssa_blkaddr; /* start block address of SSA */
101 __le32 main_blkaddr; /* start block address of main area */
102 __le32 root_ino; /* root inode number */
103 __le32 node_ino; /* node inode number */
104 __le32 meta_ino; /* meta inode number */
105 __u8 uuid[16]; /* 128-bit uuid for volume */
106 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */
107 __le32 extension_count; /* # of extensions below */
108 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */
109 __le32 cp_payload;
110 __u8 version[VERSION_LEN]; /* the kernel version */
111 __u8 init_version[VERSION_LEN]; /* the initial kernel version */
112 __le32 feature; /* defined features */
113 __u8 encryption_level; /* versioning level for encryption */
114 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
115 struct f2fs_device devs[MAX_DEVICES]; /* device list */
116 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */
117 __u8 hot_ext_count; /* # of hot file extension */
118 __le16 s_encoding; /* Filename charset encoding */
119 __le16 s_encoding_flags; /* Filename charset encoding flags */
120 __u8 reserved[306]; /* valid reserved region */
121 __le32 crc; /* checksum of superblock */
122 } __packed;
123
124 /*
125 * For checkpoint
126 */
127 #define CP_RESIZEFS_FLAG 0x00004000
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 __le32 i_extra_end[0]; /* for attribute size calculation */
276 } __packed;
277 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */
278 };
279 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2),
280 double_indirect(1) node id */
281 } __packed;
282
283 struct direct_node {
284 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */
285 } __packed;
286
287 struct indirect_node {
288 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */
289 } __packed;
290
291 enum {
292 COLD_BIT_SHIFT = 0,
293 FSYNC_BIT_SHIFT,
294 DENT_BIT_SHIFT,
295 OFFSET_BIT_SHIFT
296 };
297
298 #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
299
300 struct node_footer {
301 __le32 nid; /* node id */
302 __le32 ino; /* inode number */
303 __le32 flag; /* include cold/fsync/dentry marks and offset */
304 __le64 cp_ver; /* checkpoint version */
305 __le32 next_blkaddr; /* next node page block address */
306 } __packed;
307
308 struct f2fs_node {
309 /* can be one of three types: inode, direct, and indirect types */
310 union {
311 struct f2fs_inode i;
312 struct direct_node dn;
313 struct indirect_node in;
314 };
315 struct node_footer footer;
316 } __packed;
317
318 /*
319 * For NAT entries
320 */
321 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry))
322
323 struct f2fs_nat_entry {
324 __u8 version; /* latest version of cached nat entry */
325 __le32 ino; /* inode number */
326 __le32 block_addr; /* block address */
327 } __packed;
328
329 struct f2fs_nat_block {
330 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
331 } __packed;
332
333 /*
334 * For SIT entries
335 *
336 * Each segment is 2MB in size by default so that a bitmap for validity of
337 * there-in blocks should occupy 64 bytes, 512 bits.
338 * Not allow to change this.
339 */
340 #define SIT_VBLOCK_MAP_SIZE 64
341 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
342
343 /*
344 * F2FS uses 4 bytes to represent block address. As a result, supported size of
345 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
346 */
347 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2)
348
349 /*
350 * Note that f2fs_sit_entry->vblocks has the following bit-field information.
351 * [15:10] : allocation type such as CURSEG_XXXX_TYPE
352 * [9:0] : valid block count
353 */
354 #define SIT_VBLOCKS_SHIFT 10
355 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1)
356 #define GET_SIT_VBLOCKS(raw_sit) \
357 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
358 #define GET_SIT_TYPE(raw_sit) \
359 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \
360 >> SIT_VBLOCKS_SHIFT)
361
362 struct f2fs_sit_entry {
363 __le16 vblocks; /* reference above */
364 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */
365 __le64 mtime; /* segment age for cleaning */
366 } __packed;
367
368 struct f2fs_sit_block {
369 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
370 } __packed;
371
372 /*
373 * For segment summary
374 *
375 * One summary block contains exactly 512 summary entries, which represents
376 * exactly 2MB segment by default. Not allow to change the basic units.
377 *
378 * NOTE: For initializing fields, you must use set_summary
379 *
380 * - If data page, nid represents dnode's nid
381 * - If node page, nid represents the node page's nid.
382 *
383 * The ofs_in_node is used by only data page. It represents offset
384 * from node's page's beginning to get a data block address.
385 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
386 */
387 #define ENTRIES_IN_SUM 512
388 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */
389 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */
390 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM)
391
392 /* a summary entry for a 4KB-sized block in a segment */
393 struct f2fs_summary {
394 __le32 nid; /* parent node id */
395 union {
396 __u8 reserved[3];
397 struct {
398 __u8 version; /* node version number */
399 __le16 ofs_in_node; /* block index in parent node */
400 } __packed;
401 };
402 } __packed;
403
404 /* summary block type, node or data, is stored to the summary_footer */
405 #define SUM_TYPE_NODE (1)
406 #define SUM_TYPE_DATA (0)
407
408 struct summary_footer {
409 unsigned char entry_type; /* SUM_TYPE_XXX */
410 __le32 check_sum; /* summary checksum */
411 } __packed;
412
413 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
414 SUM_ENTRY_SIZE)
415 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
416 sizeof(struct nat_journal_entry))
417 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
418 sizeof(struct nat_journal_entry))
419 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
420 sizeof(struct sit_journal_entry))
421 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
422 sizeof(struct sit_journal_entry))
423
424 /* Reserved area should make size of f2fs_extra_info equals to
425 * that of nat_journal and sit_journal.
426 */
427 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8)
428
429 /*
430 * frequently updated NAT/SIT entries can be stored in the spare area in
431 * summary blocks
432 */
433 enum {
434 NAT_JOURNAL = 0,
435 SIT_JOURNAL
436 };
437
438 struct nat_journal_entry {
439 __le32 nid;
440 struct f2fs_nat_entry ne;
441 } __packed;
442
443 struct nat_journal {
444 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
445 __u8 reserved[NAT_JOURNAL_RESERVED];
446 } __packed;
447
448 struct sit_journal_entry {
449 __le32 segno;
450 struct f2fs_sit_entry se;
451 } __packed;
452
453 struct sit_journal {
454 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
455 __u8 reserved[SIT_JOURNAL_RESERVED];
456 } __packed;
457
458 struct f2fs_extra_info {
459 __le64 kbytes_written;
460 __u8 reserved[EXTRA_INFO_RESERVED];
461 } __packed;
462
463 struct f2fs_journal {
464 union {
465 __le16 n_nats;
466 __le16 n_sits;
467 };
468 /* spare area is used by NAT or SIT journals or extra info */
469 union {
470 struct nat_journal nat_j;
471 struct sit_journal sit_j;
472 struct f2fs_extra_info info;
473 };
474 } __packed;
475
476 /* 4KB-sized summary block structure */
477 struct f2fs_summary_block {
478 struct f2fs_summary entries[ENTRIES_IN_SUM];
479 struct f2fs_journal journal;
480 struct summary_footer footer;
481 } __packed;
482
483 /*
484 * For directory operations
485 */
486 #define F2FS_DOT_HASH 0
487 #define F2FS_DDOT_HASH F2FS_DOT_HASH
488 #define F2FS_MAX_HASH (~((0x3ULL) << 62))
489 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63)
490
491 typedef __le32 f2fs_hash_t;
492
493 /* One directory entry slot covers 8bytes-long file name */
494 #define F2FS_SLOT_LEN 8
495 #define F2FS_SLOT_LEN_BITS 3
496
497 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
498
499 /* MAX level for dir lookup */
500 #define MAX_DIR_HASH_DEPTH 63
501
502 /* MAX buckets in one level of dir */
503 #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
504
505 /*
506 * space utilization of regular dentry and inline dentry (w/o extra reservation)
507 * regular dentry inline dentry (def) inline dentry (min)
508 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1
509 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1
510 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22
511 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16
512 * total 4096 3488 40
513 *
514 * Note: there are more reserved space in inline dentry than in regular
515 * dentry, when converting inline dentry we should handle this carefully.
516 */
517 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */
518 #define SIZE_OF_DIR_ENTRY 11 /* by byte */
519 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
520 BITS_PER_BYTE)
521 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
522 F2FS_SLOT_LEN) * \
523 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
524 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */
525
526 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
527 struct f2fs_dir_entry {
528 __le32 hash_code; /* hash code of file name */
529 __le32 ino; /* inode number */
530 __le16 name_len; /* length of file name */
531 __u8 file_type; /* file type */
532 } __packed;
533
534 /* 4KB-sized directory entry block */
535 struct f2fs_dentry_block {
536 /* validity bitmap for directory entries in each block */
537 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
538 __u8 reserved[SIZE_OF_RESERVED];
539 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
540 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
541 } __packed;
542
543 /* file types used in inode_info->flags */
544 enum {
545 F2FS_FT_UNKNOWN,
546 F2FS_FT_REG_FILE,
547 F2FS_FT_DIR,
548 F2FS_FT_CHRDEV,
549 F2FS_FT_BLKDEV,
550 F2FS_FT_FIFO,
551 F2FS_FT_SOCK,
552 F2FS_FT_SYMLINK,
553 F2FS_FT_MAX
554 };
555
556 #define S_SHIFT 12
557
558 #define F2FS_DEF_PROJID 0 /* default project ID */
559
560 #endif /* _LINUX_F2FS_FS_H */