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dd31866b JK |
1 | /** |
2 | * include/linux/f2fs_fs.h | |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #ifndef _LINUX_F2FS_FS_H | |
12 | #define _LINUX_F2FS_FS_H | |
13 | ||
14 | #include <linux/pagemap.h> | |
15 | #include <linux/types.h> | |
16 | ||
17 | #define F2FS_SUPER_OFFSET 1024 /* byte-size offset */ | |
55cf9cb6 CY |
18 | #define F2FS_MIN_LOG_SECTOR_SIZE 9 /* 9 bits for 512 bytes */ |
19 | #define F2FS_MAX_LOG_SECTOR_SIZE 12 /* 12 bits for 4096 bytes */ | |
20 | #define F2FS_LOG_SECTORS_PER_BLOCK 3 /* log number for sector/blk */ | |
dd31866b | 21 | #define F2FS_BLKSIZE 4096 /* support only 4KB block */ |
f7ef9b83 | 22 | #define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */ |
dd31866b | 23 | #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ |
1dbe4152 | 24 | #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) / F2FS_BLKSIZE) |
dd31866b | 25 | |
a9841c4d JK |
26 | #define NULL_ADDR ((block_t)0) /* used as block_t addresses */ |
27 | #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */ | |
dd31866b | 28 | |
f7ef9b83 JK |
29 | #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS) |
30 | #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS) | |
31 | ||
c200b1aa CY |
32 | /* 0, 1(node nid), 2(meta nid) are reserved node id */ |
33 | #define F2FS_RESERVED_NODE_NUM 3 | |
34 | ||
dd31866b JK |
35 | #define F2FS_ROOT_INO(sbi) (sbi->root_ino_num) |
36 | #define F2FS_NODE_INO(sbi) (sbi->node_ino_num) | |
37 | #define F2FS_META_INO(sbi) (sbi->meta_ino_num) | |
38 | ||
39 | /* This flag is used by node and meta inodes, and by recovery */ | |
a78186eb JK |
40 | #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) |
41 | #define GFP_F2FS_HIGH_ZERO (GFP_NOFS | __GFP_ZERO | __GFP_HIGHMEM) | |
dd31866b JK |
42 | |
43 | /* | |
44 | * For further optimization on multi-head logs, on-disk layout supports maximum | |
45 | * 16 logs by default. The number, 16, is expected to cover all the cases | |
46 | * enoughly. The implementaion currently uses no more than 6 logs. | |
47 | * Half the logs are used for nodes, and the other half are used for data. | |
48 | */ | |
49 | #define MAX_ACTIVE_LOGS 16 | |
50 | #define MAX_ACTIVE_NODE_LOGS 8 | |
51 | #define MAX_ACTIVE_DATA_LOGS 8 | |
52 | ||
0040b933 JK |
53 | #define VERSION_LEN 256 |
54 | ||
dd31866b JK |
55 | /* |
56 | * For superblock | |
57 | */ | |
58 | struct f2fs_super_block { | |
59 | __le32 magic; /* Magic Number */ | |
60 | __le16 major_ver; /* Major Version */ | |
61 | __le16 minor_ver; /* Minor Version */ | |
62 | __le32 log_sectorsize; /* log2 sector size in bytes */ | |
63 | __le32 log_sectors_per_block; /* log2 # of sectors per block */ | |
64 | __le32 log_blocksize; /* log2 block size in bytes */ | |
65 | __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ | |
66 | __le32 segs_per_sec; /* # of segments per section */ | |
67 | __le32 secs_per_zone; /* # of sections per zone */ | |
68 | __le32 checksum_offset; /* checksum offset inside super block */ | |
69 | __le64 block_count; /* total # of user blocks */ | |
70 | __le32 section_count; /* total # of sections */ | |
71 | __le32 segment_count; /* total # of segments */ | |
72 | __le32 segment_count_ckpt; /* # of segments for checkpoint */ | |
73 | __le32 segment_count_sit; /* # of segments for SIT */ | |
74 | __le32 segment_count_nat; /* # of segments for NAT */ | |
75 | __le32 segment_count_ssa; /* # of segments for SSA */ | |
76 | __le32 segment_count_main; /* # of segments for main area */ | |
77 | __le32 segment0_blkaddr; /* start block address of segment 0 */ | |
78 | __le32 cp_blkaddr; /* start block address of checkpoint */ | |
79 | __le32 sit_blkaddr; /* start block address of SIT */ | |
80 | __le32 nat_blkaddr; /* start block address of NAT */ | |
81 | __le32 ssa_blkaddr; /* start block address of SSA */ | |
82 | __le32 main_blkaddr; /* start block address of main area */ | |
83 | __le32 root_ino; /* root inode number */ | |
84 | __le32 node_ino; /* node inode number */ | |
85 | __le32 meta_ino; /* meta inode number */ | |
86 | __u8 uuid[16]; /* 128-bit uuid for volume */ | |
87 | __le16 volume_name[512]; /* volume name */ | |
88 | __le32 extension_count; /* # of extensions below */ | |
89 | __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */ | |
1dbe4152 | 90 | __le32 cp_payload; |
0040b933 JK |
91 | __u8 version[VERSION_LEN]; /* the kernel version */ |
92 | __u8 init_version[VERSION_LEN]; /* the initial kernel version */ | |
76f105a2 | 93 | __le32 feature; /* defined features */ |
cde4de12 JK |
94 | __u8 encryption_level; /* versioning level for encryption */ |
95 | __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ | |
96 | __u8 reserved[871]; /* valid reserved region */ | |
dd31866b JK |
97 | } __packed; |
98 | ||
99 | /* | |
100 | * For checkpoint | |
101 | */ | |
119ee914 | 102 | #define CP_FASTBOOT_FLAG 0x00000020 |
2ae4c673 | 103 | #define CP_FSCK_FLAG 0x00000010 |
dd31866b JK |
104 | #define CP_ERROR_FLAG 0x00000008 |
105 | #define CP_COMPACT_SUM_FLAG 0x00000004 | |
106 | #define CP_ORPHAN_PRESENT_FLAG 0x00000002 | |
107 | #define CP_UMOUNT_FLAG 0x00000001 | |
108 | ||
b5b82205 CY |
109 | #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ |
110 | ||
dd31866b JK |
111 | struct f2fs_checkpoint { |
112 | __le64 checkpoint_ver; /* checkpoint block version number */ | |
113 | __le64 user_block_count; /* # of user blocks */ | |
114 | __le64 valid_block_count; /* # of valid blocks in main area */ | |
115 | __le32 rsvd_segment_count; /* # of reserved segments for gc */ | |
116 | __le32 overprov_segment_count; /* # of overprovision segments */ | |
117 | __le32 free_segment_count; /* # of free segments in main area */ | |
118 | ||
119 | /* information of current node segments */ | |
120 | __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; | |
121 | __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; | |
122 | /* information of current data segments */ | |
123 | __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; | |
124 | __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; | |
125 | __le32 ckpt_flags; /* Flags : umount and journal_present */ | |
126 | __le32 cp_pack_total_block_count; /* total # of one cp pack */ | |
127 | __le32 cp_pack_start_sum; /* start block number of data summary */ | |
128 | __le32 valid_node_count; /* Total number of valid nodes */ | |
129 | __le32 valid_inode_count; /* Total number of valid inodes */ | |
130 | __le32 next_free_nid; /* Next free node number */ | |
131 | __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ | |
132 | __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ | |
133 | __le32 checksum_offset; /* checksum offset inside cp block */ | |
134 | __le64 elapsed_time; /* mounted time */ | |
135 | /* allocation type of current segment */ | |
136 | unsigned char alloc_type[MAX_ACTIVE_LOGS]; | |
137 | ||
138 | /* SIT and NAT version bitmap */ | |
139 | unsigned char sit_nat_version_bitmap[1]; | |
140 | } __packed; | |
141 | ||
142 | /* | |
143 | * For orphan inode management | |
144 | */ | |
145 | #define F2FS_ORPHANS_PER_BLOCK 1020 | |
146 | ||
b5b82205 CY |
147 | #define GET_ORPHAN_BLOCKS(n) ((n + F2FS_ORPHANS_PER_BLOCK - 1) / \ |
148 | F2FS_ORPHANS_PER_BLOCK) | |
149 | ||
dd31866b JK |
150 | struct f2fs_orphan_block { |
151 | __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ | |
152 | __le32 reserved; /* reserved */ | |
153 | __le16 blk_addr; /* block index in current CP */ | |
154 | __le16 blk_count; /* Number of orphan inode blocks in CP */ | |
155 | __le32 entry_count; /* Total number of orphan nodes in current CP */ | |
156 | __le32 check_sum; /* CRC32 for orphan inode block */ | |
157 | } __packed; | |
158 | ||
159 | /* | |
160 | * For NODE structure | |
161 | */ | |
162 | struct f2fs_extent { | |
163 | __le32 fofs; /* start file offset of the extent */ | |
4d0b0bd4 | 164 | __le32 blk; /* start block address of the extent */ |
dd31866b JK |
165 | __le32 len; /* lengh of the extent */ |
166 | } __packed; | |
167 | ||
5a20d339 | 168 | #define F2FS_NAME_LEN 255 |
65985d93 | 169 | #define F2FS_INLINE_XATTR_ADDRS 50 /* 200 bytes for inline xattrs */ |
de93653f | 170 | #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ |
b5b82205 | 171 | #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ |
de93653f JK |
172 | #define ADDRS_PER_INODE(fi) addrs_per_inode(fi) |
173 | #define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ | |
174 | #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ | |
175 | ||
6403eb1f CY |
176 | #define ADDRS_PER_PAGE(page, fi) \ |
177 | (IS_INODE(page) ? ADDRS_PER_INODE(fi) : ADDRS_PER_BLOCK) | |
178 | ||
de93653f JK |
179 | #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) |
180 | #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) | |
181 | #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) | |
182 | #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) | |
183 | #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) | |
dd31866b | 184 | |
444c580f | 185 | #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ |
1001b347 | 186 | #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ |
34d67deb | 187 | #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ |
b3d208f9 | 188 | #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ |
510022a8 | 189 | #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ |
1001b347 | 190 | |
1001b347 HL |
191 | #define MAX_INLINE_DATA (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \ |
192 | F2FS_INLINE_XATTR_ADDRS - 1)) | |
193 | ||
dd31866b JK |
194 | struct f2fs_inode { |
195 | __le16 i_mode; /* file mode */ | |
196 | __u8 i_advise; /* file hints */ | |
444c580f | 197 | __u8 i_inline; /* file inline flags */ |
dd31866b JK |
198 | __le32 i_uid; /* user ID */ |
199 | __le32 i_gid; /* group ID */ | |
200 | __le32 i_links; /* links count */ | |
201 | __le64 i_size; /* file size in bytes */ | |
202 | __le64 i_blocks; /* file size in blocks */ | |
203 | __le64 i_atime; /* access time */ | |
204 | __le64 i_ctime; /* change time */ | |
205 | __le64 i_mtime; /* modification time */ | |
206 | __le32 i_atime_nsec; /* access time in nano scale */ | |
207 | __le32 i_ctime_nsec; /* change time in nano scale */ | |
208 | __le32 i_mtime_nsec; /* modification time in nano scale */ | |
209 | __le32 i_generation; /* file version (for NFS) */ | |
210 | __le32 i_current_depth; /* only for directory depth */ | |
211 | __le32 i_xattr_nid; /* nid to save xattr */ | |
212 | __le32 i_flags; /* file attributes */ | |
213 | __le32 i_pino; /* parent inode number */ | |
214 | __le32 i_namelen; /* file name length */ | |
5a20d339 | 215 | __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ |
38431545 | 216 | __u8 i_dir_level; /* dentry_level for large dir */ |
dd31866b JK |
217 | |
218 | struct f2fs_extent i_ext; /* caching a largest extent */ | |
219 | ||
de93653f | 220 | __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ |
dd31866b | 221 | |
b5b82205 | 222 | __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), |
dd31866b JK |
223 | double_indirect(1) node id */ |
224 | } __packed; | |
225 | ||
226 | struct direct_node { | |
227 | __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */ | |
228 | } __packed; | |
229 | ||
230 | struct indirect_node { | |
231 | __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ | |
232 | } __packed; | |
233 | ||
234 | enum { | |
235 | COLD_BIT_SHIFT = 0, | |
236 | FSYNC_BIT_SHIFT, | |
237 | DENT_BIT_SHIFT, | |
238 | OFFSET_BIT_SHIFT | |
239 | }; | |
240 | ||
09eb483e JK |
241 | #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */ |
242 | ||
dd31866b JK |
243 | struct node_footer { |
244 | __le32 nid; /* node id */ | |
245 | __le32 ino; /* inode nunmber */ | |
246 | __le32 flag; /* include cold/fsync/dentry marks and offset */ | |
247 | __le64 cp_ver; /* checkpoint version */ | |
248 | __le32 next_blkaddr; /* next node page block address */ | |
249 | } __packed; | |
250 | ||
251 | struct f2fs_node { | |
252 | /* can be one of three types: inode, direct, and indirect types */ | |
253 | union { | |
254 | struct f2fs_inode i; | |
255 | struct direct_node dn; | |
256 | struct indirect_node in; | |
257 | }; | |
258 | struct node_footer footer; | |
259 | } __packed; | |
260 | ||
261 | /* | |
262 | * For NAT entries | |
263 | */ | |
264 | #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry)) | |
265 | ||
266 | struct f2fs_nat_entry { | |
267 | __u8 version; /* latest version of cached nat entry */ | |
268 | __le32 ino; /* inode number */ | |
269 | __le32 block_addr; /* block address */ | |
270 | } __packed; | |
271 | ||
272 | struct f2fs_nat_block { | |
273 | struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; | |
274 | } __packed; | |
275 | ||
276 | /* | |
277 | * For SIT entries | |
278 | * | |
279 | * Each segment is 2MB in size by default so that a bitmap for validity of | |
280 | * there-in blocks should occupy 64 bytes, 512 bits. | |
281 | * Not allow to change this. | |
282 | */ | |
283 | #define SIT_VBLOCK_MAP_SIZE 64 | |
284 | #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry)) | |
285 | ||
286 | /* | |
287 | * Note that f2fs_sit_entry->vblocks has the following bit-field information. | |
288 | * [15:10] : allocation type such as CURSEG_XXXX_TYPE | |
289 | * [9:0] : valid block count | |
290 | */ | |
291 | #define SIT_VBLOCKS_SHIFT 10 | |
292 | #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) | |
293 | #define GET_SIT_VBLOCKS(raw_sit) \ | |
294 | (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) | |
295 | #define GET_SIT_TYPE(raw_sit) \ | |
296 | ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ | |
297 | >> SIT_VBLOCKS_SHIFT) | |
298 | ||
299 | struct f2fs_sit_entry { | |
300 | __le16 vblocks; /* reference above */ | |
301 | __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ | |
302 | __le64 mtime; /* segment age for cleaning */ | |
303 | } __packed; | |
304 | ||
305 | struct f2fs_sit_block { | |
306 | struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; | |
307 | } __packed; | |
308 | ||
309 | /* | |
310 | * For segment summary | |
311 | * | |
312 | * One summary block contains exactly 512 summary entries, which represents | |
313 | * exactly 2MB segment by default. Not allow to change the basic units. | |
314 | * | |
315 | * NOTE: For initializing fields, you must use set_summary | |
316 | * | |
317 | * - If data page, nid represents dnode's nid | |
318 | * - If node page, nid represents the node page's nid. | |
319 | * | |
320 | * The ofs_in_node is used by only data page. It represents offset | |
321 | * from node's page's beginning to get a data block address. | |
322 | * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) | |
323 | */ | |
324 | #define ENTRIES_IN_SUM 512 | |
25ca923b JK |
325 | #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ |
326 | #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ | |
dd31866b JK |
327 | #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) |
328 | ||
329 | /* a summary entry for a 4KB-sized block in a segment */ | |
330 | struct f2fs_summary { | |
331 | __le32 nid; /* parent node id */ | |
332 | union { | |
333 | __u8 reserved[3]; | |
334 | struct { | |
335 | __u8 version; /* node version number */ | |
336 | __le16 ofs_in_node; /* block index in parent node */ | |
337 | } __packed; | |
338 | }; | |
339 | } __packed; | |
340 | ||
341 | /* summary block type, node or data, is stored to the summary_footer */ | |
342 | #define SUM_TYPE_NODE (1) | |
343 | #define SUM_TYPE_DATA (0) | |
344 | ||
345 | struct summary_footer { | |
346 | unsigned char entry_type; /* SUM_TYPE_XXX */ | |
347 | __u32 check_sum; /* summary checksum */ | |
348 | } __packed; | |
349 | ||
25ca923b | 350 | #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ |
dd31866b JK |
351 | SUM_ENTRY_SIZE) |
352 | #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ | |
353 | sizeof(struct nat_journal_entry)) | |
354 | #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ | |
355 | sizeof(struct nat_journal_entry)) | |
356 | #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ | |
357 | sizeof(struct sit_journal_entry)) | |
358 | #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ | |
359 | sizeof(struct sit_journal_entry)) | |
360 | /* | |
361 | * frequently updated NAT/SIT entries can be stored in the spare area in | |
362 | * summary blocks | |
363 | */ | |
364 | enum { | |
365 | NAT_JOURNAL = 0, | |
366 | SIT_JOURNAL | |
367 | }; | |
368 | ||
369 | struct nat_journal_entry { | |
370 | __le32 nid; | |
371 | struct f2fs_nat_entry ne; | |
372 | } __packed; | |
373 | ||
374 | struct nat_journal { | |
375 | struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; | |
376 | __u8 reserved[NAT_JOURNAL_RESERVED]; | |
377 | } __packed; | |
378 | ||
379 | struct sit_journal_entry { | |
380 | __le32 segno; | |
381 | struct f2fs_sit_entry se; | |
382 | } __packed; | |
383 | ||
384 | struct sit_journal { | |
385 | struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; | |
386 | __u8 reserved[SIT_JOURNAL_RESERVED]; | |
387 | } __packed; | |
388 | ||
389 | /* 4KB-sized summary block structure */ | |
390 | struct f2fs_summary_block { | |
391 | struct f2fs_summary entries[ENTRIES_IN_SUM]; | |
392 | union { | |
393 | __le16 n_nats; | |
394 | __le16 n_sits; | |
395 | }; | |
396 | /* spare area is used by NAT or SIT journals */ | |
397 | union { | |
398 | struct nat_journal nat_j; | |
399 | struct sit_journal sit_j; | |
400 | }; | |
401 | struct summary_footer footer; | |
402 | } __packed; | |
403 | ||
404 | /* | |
405 | * For directory operations | |
406 | */ | |
407 | #define F2FS_DOT_HASH 0 | |
408 | #define F2FS_DDOT_HASH F2FS_DOT_HASH | |
409 | #define F2FS_MAX_HASH (~((0x3ULL) << 62)) | |
410 | #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) | |
411 | ||
412 | typedef __le32 f2fs_hash_t; | |
413 | ||
414 | /* One directory entry slot covers 8bytes-long file name */ | |
5a20d339 JK |
415 | #define F2FS_SLOT_LEN 8 |
416 | #define F2FS_SLOT_LEN_BITS 3 | |
457d08ee | 417 | |
5a20d339 | 418 | #define GET_DENTRY_SLOTS(x) ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) |
dd31866b JK |
419 | |
420 | /* the number of dentry in a block */ | |
421 | #define NR_DENTRY_IN_BLOCK 214 | |
422 | ||
423 | /* MAX level for dir lookup */ | |
424 | #define MAX_DIR_HASH_DEPTH 63 | |
425 | ||
bfec07d0 CY |
426 | /* MAX buckets in one level of dir */ |
427 | #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1)) | |
428 | ||
dd31866b JK |
429 | #define SIZE_OF_DIR_ENTRY 11 /* by byte */ |
430 | #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ | |
431 | BITS_PER_BYTE) | |
432 | #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ | |
5a20d339 | 433 | F2FS_SLOT_LEN) * \ |
dd31866b JK |
434 | NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) |
435 | ||
5a20d339 | 436 | /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ |
dd31866b JK |
437 | struct f2fs_dir_entry { |
438 | __le32 hash_code; /* hash code of file name */ | |
439 | __le32 ino; /* inode number */ | |
440 | __le16 name_len; /* lengh of file name */ | |
441 | __u8 file_type; /* file type */ | |
442 | } __packed; | |
443 | ||
444 | /* 4KB-sized directory entry block */ | |
445 | struct f2fs_dentry_block { | |
446 | /* validity bitmap for directory entries in each block */ | |
447 | __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; | |
448 | __u8 reserved[SIZE_OF_RESERVED]; | |
449 | struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; | |
5a20d339 | 450 | __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; |
dd31866b JK |
451 | } __packed; |
452 | ||
34d67deb CY |
453 | /* for inline dir */ |
454 | #define NR_INLINE_DENTRY (MAX_INLINE_DATA * BITS_PER_BYTE / \ | |
455 | ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \ | |
456 | BITS_PER_BYTE + 1)) | |
457 | #define INLINE_DENTRY_BITMAP_SIZE ((NR_INLINE_DENTRY + \ | |
458 | BITS_PER_BYTE - 1) / BITS_PER_BYTE) | |
459 | #define INLINE_RESERVED_SIZE (MAX_INLINE_DATA - \ | |
460 | ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \ | |
461 | NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE)) | |
462 | ||
463 | /* inline directory entry structure */ | |
464 | struct f2fs_inline_dentry { | |
465 | __u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE]; | |
466 | __u8 reserved[INLINE_RESERVED_SIZE]; | |
467 | struct f2fs_dir_entry dentry[NR_INLINE_DENTRY]; | |
468 | __u8 filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN]; | |
469 | } __packed; | |
470 | ||
dd31866b JK |
471 | /* file types used in inode_info->flags */ |
472 | enum { | |
473 | F2FS_FT_UNKNOWN, | |
474 | F2FS_FT_REG_FILE, | |
475 | F2FS_FT_DIR, | |
476 | F2FS_FT_CHRDEV, | |
477 | F2FS_FT_BLKDEV, | |
478 | F2FS_FT_FIFO, | |
479 | F2FS_FT_SOCK, | |
480 | F2FS_FT_SYMLINK, | |
481 | F2FS_FT_MAX | |
482 | }; | |
483 | ||
484 | #endif /* _LINUX_F2FS_FS_H */ |