Root/
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 */ |
18 | #define F2FS_LOG_SECTOR_SIZE 9 /* 9 bits for 512 byte */ |
19 | #define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */ |
20 | #define F2FS_BLKSIZE 4096 /* support only 4KB block */ |
21 | #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ |
22 | |
23 | #define NULL_ADDR ((block_t)0) /* used as block_t addresses */ |
24 | #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */ |
25 | |
26 | #define F2FS_ROOT_INO(sbi) (sbi->root_ino_num) |
27 | #define F2FS_NODE_INO(sbi) (sbi->node_ino_num) |
28 | #define F2FS_META_INO(sbi) (sbi->meta_ino_num) |
29 | |
30 | /* This flag is used by node and meta inodes, and by recovery */ |
31 | #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) |
32 | |
33 | /* |
34 | * For further optimization on multi-head logs, on-disk layout supports maximum |
35 | * 16 logs by default. The number, 16, is expected to cover all the cases |
36 | * enoughly. The implementaion currently uses no more than 6 logs. |
37 | * Half the logs are used for nodes, and the other half are used for data. |
38 | */ |
39 | #define MAX_ACTIVE_LOGS 16 |
40 | #define MAX_ACTIVE_NODE_LOGS 8 |
41 | #define MAX_ACTIVE_DATA_LOGS 8 |
42 | |
43 | /* |
44 | * For superblock |
45 | */ |
46 | struct f2fs_super_block { |
47 | __le32 magic; /* Magic Number */ |
48 | __le16 major_ver; /* Major Version */ |
49 | __le16 minor_ver; /* Minor Version */ |
50 | __le32 log_sectorsize; /* log2 sector size in bytes */ |
51 | __le32 log_sectors_per_block; /* log2 # of sectors per block */ |
52 | __le32 log_blocksize; /* log2 block size in bytes */ |
53 | __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ |
54 | __le32 segs_per_sec; /* # of segments per section */ |
55 | __le32 secs_per_zone; /* # of sections per zone */ |
56 | __le32 checksum_offset; /* checksum offset inside super block */ |
57 | __le64 block_count; /* total # of user blocks */ |
58 | __le32 section_count; /* total # of sections */ |
59 | __le32 segment_count; /* total # of segments */ |
60 | __le32 segment_count_ckpt; /* # of segments for checkpoint */ |
61 | __le32 segment_count_sit; /* # of segments for SIT */ |
62 | __le32 segment_count_nat; /* # of segments for NAT */ |
63 | __le32 segment_count_ssa; /* # of segments for SSA */ |
64 | __le32 segment_count_main; /* # of segments for main area */ |
65 | __le32 segment0_blkaddr; /* start block address of segment 0 */ |
66 | __le32 cp_blkaddr; /* start block address of checkpoint */ |
67 | __le32 sit_blkaddr; /* start block address of SIT */ |
68 | __le32 nat_blkaddr; /* start block address of NAT */ |
69 | __le32 ssa_blkaddr; /* start block address of SSA */ |
70 | __le32 main_blkaddr; /* start block address of main area */ |
71 | __le32 root_ino; /* root inode number */ |
72 | __le32 node_ino; /* node inode number */ |
73 | __le32 meta_ino; /* meta inode number */ |
74 | __u8 uuid[16]; /* 128-bit uuid for volume */ |
75 | __le16 volume_name[512]; /* volume name */ |
76 | __le32 extension_count; /* # of extensions below */ |
77 | __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */ |
78 | } __packed; |
79 | |
80 | /* |
81 | * For checkpoint |
82 | */ |
83 | #define CP_ERROR_FLAG 0x00000008 |
84 | #define CP_COMPACT_SUM_FLAG 0x00000004 |
85 | #define CP_ORPHAN_PRESENT_FLAG 0x00000002 |
86 | #define CP_UMOUNT_FLAG 0x00000001 |
87 | |
88 | struct f2fs_checkpoint { |
89 | __le64 checkpoint_ver; /* checkpoint block version number */ |
90 | __le64 user_block_count; /* # of user blocks */ |
91 | __le64 valid_block_count; /* # of valid blocks in main area */ |
92 | __le32 rsvd_segment_count; /* # of reserved segments for gc */ |
93 | __le32 overprov_segment_count; /* # of overprovision segments */ |
94 | __le32 free_segment_count; /* # of free segments in main area */ |
95 | |
96 | /* information of current node segments */ |
97 | __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; |
98 | __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; |
99 | /* information of current data segments */ |
100 | __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; |
101 | __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; |
102 | __le32 ckpt_flags; /* Flags : umount and journal_present */ |
103 | __le32 cp_pack_total_block_count; /* total # of one cp pack */ |
104 | __le32 cp_pack_start_sum; /* start block number of data summary */ |
105 | __le32 valid_node_count; /* Total number of valid nodes */ |
106 | __le32 valid_inode_count; /* Total number of valid inodes */ |
107 | __le32 next_free_nid; /* Next free node number */ |
108 | __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ |
109 | __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ |
110 | __le32 checksum_offset; /* checksum offset inside cp block */ |
111 | __le64 elapsed_time; /* mounted time */ |
112 | /* allocation type of current segment */ |
113 | unsigned char alloc_type[MAX_ACTIVE_LOGS]; |
114 | |
115 | /* SIT and NAT version bitmap */ |
116 | unsigned char sit_nat_version_bitmap[1]; |
117 | } __packed; |
118 | |
119 | /* |
120 | * For orphan inode management |
121 | */ |
122 | #define F2FS_ORPHANS_PER_BLOCK 1020 |
123 | |
124 | struct f2fs_orphan_block { |
125 | __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ |
126 | __le32 reserved; /* reserved */ |
127 | __le16 blk_addr; /* block index in current CP */ |
128 | __le16 blk_count; /* Number of orphan inode blocks in CP */ |
129 | __le32 entry_count; /* Total number of orphan nodes in current CP */ |
130 | __le32 check_sum; /* CRC32 for orphan inode block */ |
131 | } __packed; |
132 | |
133 | /* |
134 | * For NODE structure |
135 | */ |
136 | struct f2fs_extent { |
137 | __le32 fofs; /* start file offset of the extent */ |
138 | __le32 blk_addr; /* start block address of the extent */ |
139 | __le32 len; /* lengh of the extent */ |
140 | } __packed; |
141 | |
142 | #define F2FS_NAME_LEN 255 |
143 | #define F2FS_INLINE_XATTR_ADDRS 50 /* 200 bytes for inline xattrs */ |
144 | #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ |
145 | #define ADDRS_PER_INODE(fi) addrs_per_inode(fi) |
146 | #define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ |
147 | #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ |
148 | |
149 | #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) |
150 | #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) |
151 | #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) |
152 | #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) |
153 | #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) |
154 | |
155 | #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ |
156 | |
157 | struct f2fs_inode { |
158 | __le16 i_mode; /* file mode */ |
159 | __u8 i_advise; /* file hints */ |
160 | __u8 i_inline; /* file inline flags */ |
161 | __le32 i_uid; /* user ID */ |
162 | __le32 i_gid; /* group ID */ |
163 | __le32 i_links; /* links count */ |
164 | __le64 i_size; /* file size in bytes */ |
165 | __le64 i_blocks; /* file size in blocks */ |
166 | __le64 i_atime; /* access time */ |
167 | __le64 i_ctime; /* change time */ |
168 | __le64 i_mtime; /* modification time */ |
169 | __le32 i_atime_nsec; /* access time in nano scale */ |
170 | __le32 i_ctime_nsec; /* change time in nano scale */ |
171 | __le32 i_mtime_nsec; /* modification time in nano scale */ |
172 | __le32 i_generation; /* file version (for NFS) */ |
173 | __le32 i_current_depth; /* only for directory depth */ |
174 | __le32 i_xattr_nid; /* nid to save xattr */ |
175 | __le32 i_flags; /* file attributes */ |
176 | __le32 i_pino; /* parent inode number */ |
177 | __le32 i_namelen; /* file name length */ |
178 | __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ |
179 | __u8 i_reserved2; /* for backward compatibility */ |
180 | |
181 | struct f2fs_extent i_ext; /* caching a largest extent */ |
182 | |
183 | __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ |
184 | |
185 | __le32 i_nid[5]; /* direct(2), indirect(2), |
186 | double_indirect(1) node id */ |
187 | } __packed; |
188 | |
189 | struct direct_node { |
190 | __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */ |
191 | } __packed; |
192 | |
193 | struct indirect_node { |
194 | __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ |
195 | } __packed; |
196 | |
197 | enum { |
198 | COLD_BIT_SHIFT = 0, |
199 | FSYNC_BIT_SHIFT, |
200 | DENT_BIT_SHIFT, |
201 | OFFSET_BIT_SHIFT |
202 | }; |
203 | |
204 | struct node_footer { |
205 | __le32 nid; /* node id */ |
206 | __le32 ino; /* inode nunmber */ |
207 | __le32 flag; /* include cold/fsync/dentry marks and offset */ |
208 | __le64 cp_ver; /* checkpoint version */ |
209 | __le32 next_blkaddr; /* next node page block address */ |
210 | } __packed; |
211 | |
212 | struct f2fs_node { |
213 | /* can be one of three types: inode, direct, and indirect types */ |
214 | union { |
215 | struct f2fs_inode i; |
216 | struct direct_node dn; |
217 | struct indirect_node in; |
218 | }; |
219 | struct node_footer footer; |
220 | } __packed; |
221 | |
222 | /* |
223 | * For NAT entries |
224 | */ |
225 | #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry)) |
226 | |
227 | struct f2fs_nat_entry { |
228 | __u8 version; /* latest version of cached nat entry */ |
229 | __le32 ino; /* inode number */ |
230 | __le32 block_addr; /* block address */ |
231 | } __packed; |
232 | |
233 | struct f2fs_nat_block { |
234 | struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; |
235 | } __packed; |
236 | |
237 | /* |
238 | * For SIT entries |
239 | * |
240 | * Each segment is 2MB in size by default so that a bitmap for validity of |
241 | * there-in blocks should occupy 64 bytes, 512 bits. |
242 | * Not allow to change this. |
243 | */ |
244 | #define SIT_VBLOCK_MAP_SIZE 64 |
245 | #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry)) |
246 | |
247 | /* |
248 | * Note that f2fs_sit_entry->vblocks has the following bit-field information. |
249 | * [15:10] : allocation type such as CURSEG_XXXX_TYPE |
250 | * [9:0] : valid block count |
251 | */ |
252 | #define SIT_VBLOCKS_SHIFT 10 |
253 | #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) |
254 | #define GET_SIT_VBLOCKS(raw_sit) \ |
255 | (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) |
256 | #define GET_SIT_TYPE(raw_sit) \ |
257 | ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ |
258 | >> SIT_VBLOCKS_SHIFT) |
259 | |
260 | struct f2fs_sit_entry { |
261 | __le16 vblocks; /* reference above */ |
262 | __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ |
263 | __le64 mtime; /* segment age for cleaning */ |
264 | } __packed; |
265 | |
266 | struct f2fs_sit_block { |
267 | struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; |
268 | } __packed; |
269 | |
270 | /* |
271 | * For segment summary |
272 | * |
273 | * One summary block contains exactly 512 summary entries, which represents |
274 | * exactly 2MB segment by default. Not allow to change the basic units. |
275 | * |
276 | * NOTE: For initializing fields, you must use set_summary |
277 | * |
278 | * - If data page, nid represents dnode's nid |
279 | * - If node page, nid represents the node page's nid. |
280 | * |
281 | * The ofs_in_node is used by only data page. It represents offset |
282 | * from node's page's beginning to get a data block address. |
283 | * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) |
284 | */ |
285 | #define ENTRIES_IN_SUM 512 |
286 | #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ |
287 | #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ |
288 | #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) |
289 | |
290 | /* a summary entry for a 4KB-sized block in a segment */ |
291 | struct f2fs_summary { |
292 | __le32 nid; /* parent node id */ |
293 | union { |
294 | __u8 reserved[3]; |
295 | struct { |
296 | __u8 version; /* node version number */ |
297 | __le16 ofs_in_node; /* block index in parent node */ |
298 | } __packed; |
299 | }; |
300 | } __packed; |
301 | |
302 | /* summary block type, node or data, is stored to the summary_footer */ |
303 | #define SUM_TYPE_NODE (1) |
304 | #define SUM_TYPE_DATA (0) |
305 | |
306 | struct summary_footer { |
307 | unsigned char entry_type; /* SUM_TYPE_XXX */ |
308 | __u32 check_sum; /* summary checksum */ |
309 | } __packed; |
310 | |
311 | #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ |
312 | SUM_ENTRY_SIZE) |
313 | #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ |
314 | sizeof(struct nat_journal_entry)) |
315 | #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ |
316 | sizeof(struct nat_journal_entry)) |
317 | #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ |
318 | sizeof(struct sit_journal_entry)) |
319 | #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ |
320 | sizeof(struct sit_journal_entry)) |
321 | /* |
322 | * frequently updated NAT/SIT entries can be stored in the spare area in |
323 | * summary blocks |
324 | */ |
325 | enum { |
326 | NAT_JOURNAL = 0, |
327 | SIT_JOURNAL |
328 | }; |
329 | |
330 | struct nat_journal_entry { |
331 | __le32 nid; |
332 | struct f2fs_nat_entry ne; |
333 | } __packed; |
334 | |
335 | struct nat_journal { |
336 | struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; |
337 | __u8 reserved[NAT_JOURNAL_RESERVED]; |
338 | } __packed; |
339 | |
340 | struct sit_journal_entry { |
341 | __le32 segno; |
342 | struct f2fs_sit_entry se; |
343 | } __packed; |
344 | |
345 | struct sit_journal { |
346 | struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; |
347 | __u8 reserved[SIT_JOURNAL_RESERVED]; |
348 | } __packed; |
349 | |
350 | /* 4KB-sized summary block structure */ |
351 | struct f2fs_summary_block { |
352 | struct f2fs_summary entries[ENTRIES_IN_SUM]; |
353 | union { |
354 | __le16 n_nats; |
355 | __le16 n_sits; |
356 | }; |
357 | /* spare area is used by NAT or SIT journals */ |
358 | union { |
359 | struct nat_journal nat_j; |
360 | struct sit_journal sit_j; |
361 | }; |
362 | struct summary_footer footer; |
363 | } __packed; |
364 | |
365 | /* |
366 | * For directory operations |
367 | */ |
368 | #define F2FS_DOT_HASH 0 |
369 | #define F2FS_DDOT_HASH F2FS_DOT_HASH |
370 | #define F2FS_MAX_HASH (~((0x3ULL) << 62)) |
371 | #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) |
372 | |
373 | typedef __le32 f2fs_hash_t; |
374 | |
375 | /* One directory entry slot covers 8bytes-long file name */ |
376 | #define F2FS_SLOT_LEN 8 |
377 | #define F2FS_SLOT_LEN_BITS 3 |
378 | |
379 | #define GET_DENTRY_SLOTS(x) ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) |
380 | |
381 | /* the number of dentry in a block */ |
382 | #define NR_DENTRY_IN_BLOCK 214 |
383 | |
384 | /* MAX level for dir lookup */ |
385 | #define MAX_DIR_HASH_DEPTH 63 |
386 | |
387 | #define SIZE_OF_DIR_ENTRY 11 /* by byte */ |
388 | #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ |
389 | BITS_PER_BYTE) |
390 | #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ |
391 | F2FS_SLOT_LEN) * \ |
392 | NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) |
393 | |
394 | /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ |
395 | struct f2fs_dir_entry { |
396 | __le32 hash_code; /* hash code of file name */ |
397 | __le32 ino; /* inode number */ |
398 | __le16 name_len; /* lengh of file name */ |
399 | __u8 file_type; /* file type */ |
400 | } __packed; |
401 | |
402 | /* 4KB-sized directory entry block */ |
403 | struct f2fs_dentry_block { |
404 | /* validity bitmap for directory entries in each block */ |
405 | __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; |
406 | __u8 reserved[SIZE_OF_RESERVED]; |
407 | struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; |
408 | __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; |
409 | } __packed; |
410 | |
411 | /* file types used in inode_info->flags */ |
412 | enum { |
413 | F2FS_FT_UNKNOWN, |
414 | F2FS_FT_REG_FILE, |
415 | F2FS_FT_DIR, |
416 | F2FS_FT_CHRDEV, |
417 | F2FS_FT_BLKDEV, |
418 | F2FS_FT_FIFO, |
419 | F2FS_FT_SOCK, |
420 | F2FS_FT_SYMLINK, |
421 | F2FS_FT_MAX |
422 | }; |
423 | |
424 | #endif /* _LINUX_F2FS_FS_H */ |
425 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9