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 PAGE_SHIFT /* Max is Block Size */ |
17 | #define F2FS_LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) /* log number for sector/blk */ |
18 | #define F2FS_BLKSIZE PAGE_SIZE /* support only block == page */ |
19 | #define F2FS_BLKSIZE_BITS PAGE_SHIFT /* 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 | #define F2FS_COMPRESS_INO(sbi) (NM_I(sbi)->max_nid) |
38 | |
39 | #define F2FS_MAX_QUOTAS 3 |
40 | |
41 | #define F2FS_ENC_UTF8_12_1 1 |
42 | |
43 | #define F2FS_IO_SIZE(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ |
44 | #define F2FS_IO_SIZE_KB(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits + 2) /* KB */ |
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 | /* reason of stop_checkpoint */ |
76 | enum stop_cp_reason { |
77 | STOP_CP_REASON_SHUTDOWN, |
78 | STOP_CP_REASON_FAULT_INJECT, |
79 | STOP_CP_REASON_META_PAGE, |
80 | STOP_CP_REASON_WRITE_FAIL, |
81 | STOP_CP_REASON_CORRUPTED_SUMMARY, |
82 | STOP_CP_REASON_UPDATE_INODE, |
83 | STOP_CP_REASON_FLUSH_FAIL, |
84 | STOP_CP_REASON_MAX, |
85 | }; |
86 | |
87 | #define MAX_STOP_REASON 32 |
88 | |
89 | /* detail reason for EFSCORRUPTED */ |
90 | enum f2fs_error { |
91 | ERROR_CORRUPTED_CLUSTER, |
92 | ERROR_FAIL_DECOMPRESSION, |
93 | ERROR_INVALID_BLKADDR, |
94 | ERROR_CORRUPTED_DIRENT, |
95 | ERROR_CORRUPTED_INODE, |
96 | ERROR_INCONSISTENT_SUMMARY, |
97 | , |
98 | ERROR_INCONSISTENT_SUM_TYPE, |
99 | ERROR_CORRUPTED_JOURNAL, |
100 | ERROR_INCONSISTENT_NODE_COUNT, |
101 | ERROR_INCONSISTENT_BLOCK_COUNT, |
102 | ERROR_INVALID_CURSEG, |
103 | ERROR_INCONSISTENT_SIT, |
104 | ERROR_CORRUPTED_VERITY_XATTR, |
105 | ERROR_CORRUPTED_XATTR, |
106 | ERROR_INVALID_NODE_REFERENCE, |
107 | ERROR_INCONSISTENT_NAT, |
108 | ERROR_MAX, |
109 | }; |
110 | |
111 | #define MAX_F2FS_ERRORS 16 |
112 | |
113 | struct f2fs_super_block { |
114 | __le32 magic; /* Magic Number */ |
115 | __le16 major_ver; /* Major Version */ |
116 | __le16 minor_ver; /* Minor Version */ |
117 | __le32 log_sectorsize; /* log2 sector size in bytes */ |
118 | __le32 log_sectors_per_block; /* log2 # of sectors per block */ |
119 | __le32 log_blocksize; /* log2 block size in bytes */ |
120 | __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ |
121 | __le32 segs_per_sec; /* # of segments per section */ |
122 | __le32 secs_per_zone; /* # of sections per zone */ |
123 | __le32 checksum_offset; /* checksum offset inside super block */ |
124 | __le64 block_count; /* total # of user blocks */ |
125 | __le32 section_count; /* total # of sections */ |
126 | __le32 segment_count; /* total # of segments */ |
127 | __le32 segment_count_ckpt; /* # of segments for checkpoint */ |
128 | __le32 segment_count_sit; /* # of segments for SIT */ |
129 | __le32 segment_count_nat; /* # of segments for NAT */ |
130 | __le32 segment_count_ssa; /* # of segments for SSA */ |
131 | __le32 segment_count_main; /* # of segments for main area */ |
132 | __le32 segment0_blkaddr; /* start block address of segment 0 */ |
133 | __le32 cp_blkaddr; /* start block address of checkpoint */ |
134 | __le32 sit_blkaddr; /* start block address of SIT */ |
135 | __le32 nat_blkaddr; /* start block address of NAT */ |
136 | __le32 ssa_blkaddr; /* start block address of SSA */ |
137 | __le32 main_blkaddr; /* start block address of main area */ |
138 | __le32 root_ino; /* root inode number */ |
139 | __le32 node_ino; /* node inode number */ |
140 | __le32 meta_ino; /* meta inode number */ |
141 | __u8 uuid[16]; /* 128-bit uuid for volume */ |
142 | __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ |
143 | __le32 extension_count; /* # of extensions below */ |
144 | __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ |
145 | __le32 cp_payload; |
146 | __u8 version[VERSION_LEN]; /* the kernel version */ |
147 | __u8 init_version[VERSION_LEN]; /* the initial kernel version */ |
148 | __le32 feature; /* defined features */ |
149 | __u8 encryption_level; /* versioning level for encryption */ |
150 | __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ |
151 | struct f2fs_device devs[MAX_DEVICES]; /* device list */ |
152 | __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ |
153 | __u8 hot_ext_count; /* # of hot file extension */ |
154 | __le16 s_encoding; /* Filename charset encoding */ |
155 | __le16 s_encoding_flags; /* Filename charset encoding flags */ |
156 | __u8 s_stop_reason[MAX_STOP_REASON]; /* stop checkpoint reason */ |
157 | __u8 s_errors[MAX_F2FS_ERRORS]; /* reason of image corrupts */ |
158 | __u8 reserved[258]; /* valid reserved region */ |
159 | __le32 crc; /* checksum of superblock */ |
160 | } __packed; |
161 | |
162 | /* |
163 | * For checkpoint |
164 | */ |
165 | #define CP_RESIZEFS_FLAG 0x00004000 |
166 | #define CP_DISABLED_QUICK_FLAG 0x00002000 |
167 | #define CP_DISABLED_FLAG 0x00001000 |
168 | #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800 |
169 | #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 |
170 | #define CP_NOCRC_RECOVERY_FLAG 0x00000200 |
171 | #define CP_TRIMMED_FLAG 0x00000100 |
172 | #define CP_NAT_BITS_FLAG 0x00000080 |
173 | #define CP_CRC_RECOVERY_FLAG 0x00000040 |
174 | #define CP_FASTBOOT_FLAG 0x00000020 |
175 | #define CP_FSCK_FLAG 0x00000010 |
176 | #define CP_ERROR_FLAG 0x00000008 |
177 | #define CP_COMPACT_SUM_FLAG 0x00000004 |
178 | #define CP_ORPHAN_PRESENT_FLAG 0x00000002 |
179 | #define CP_UMOUNT_FLAG 0x00000001 |
180 | |
181 | #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ |
182 | |
183 | struct f2fs_checkpoint { |
184 | __le64 checkpoint_ver; /* checkpoint block version number */ |
185 | __le64 user_block_count; /* # of user blocks */ |
186 | __le64 valid_block_count; /* # of valid blocks in main area */ |
187 | __le32 rsvd_segment_count; /* # of reserved segments for gc */ |
188 | __le32 overprov_segment_count; /* # of overprovision segments */ |
189 | __le32 free_segment_count; /* # of free segments in main area */ |
190 | |
191 | /* information of current node segments */ |
192 | __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; |
193 | __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; |
194 | /* information of current data segments */ |
195 | __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; |
196 | __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; |
197 | __le32 ckpt_flags; /* Flags : umount and journal_present */ |
198 | __le32 cp_pack_total_block_count; /* total # of one cp pack */ |
199 | __le32 cp_pack_start_sum; /* start block number of data summary */ |
200 | __le32 valid_node_count; /* Total number of valid nodes */ |
201 | __le32 valid_inode_count; /* Total number of valid inodes */ |
202 | __le32 next_free_nid; /* Next free node number */ |
203 | __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ |
204 | __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ |
205 | __le32 checksum_offset; /* checksum offset inside cp block */ |
206 | __le64 elapsed_time; /* mounted time */ |
207 | /* allocation type of current segment */ |
208 | unsigned char alloc_type[MAX_ACTIVE_LOGS]; |
209 | |
210 | /* SIT and NAT version bitmap */ |
211 | unsigned char sit_nat_version_bitmap[]; |
212 | } __packed; |
213 | |
214 | #define CP_CHKSUM_OFFSET (F2FS_BLKSIZE - sizeof(__le32)) /* default chksum offset in checkpoint */ |
215 | #define CP_MIN_CHKSUM_OFFSET \ |
216 | (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap)) |
217 | |
218 | /* |
219 | * For orphan inode management |
220 | */ |
221 | #define F2FS_ORPHANS_PER_BLOCK ((F2FS_BLKSIZE - 4 * sizeof(__le32)) / sizeof(__le32)) |
222 | |
223 | #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ |
224 | F2FS_ORPHANS_PER_BLOCK) |
225 | |
226 | struct f2fs_orphan_block { |
227 | __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ |
228 | __le32 reserved; /* reserved */ |
229 | __le16 blk_addr; /* block index in current CP */ |
230 | __le16 blk_count; /* Number of orphan inode blocks in CP */ |
231 | __le32 entry_count; /* Total number of orphan nodes in current CP */ |
232 | __le32 check_sum; /* CRC32 for orphan inode block */ |
233 | } __packed; |
234 | |
235 | /* |
236 | * For NODE structure |
237 | */ |
238 | struct f2fs_extent { |
239 | __le32 fofs; /* start file offset of the extent */ |
240 | __le32 blk; /* start block address of the extent */ |
241 | __le32 len; /* length of the extent */ |
242 | } __packed; |
243 | |
244 | #define F2FS_NAME_LEN 255 |
245 | /* 200 bytes for inline xattrs by default */ |
246 | #define DEFAULT_INLINE_XATTR_ADDRS 50 |
247 | |
248 | #define OFFSET_OF_END_OF_I_EXT 360 |
249 | #define SIZE_OF_I_NID 20 |
250 | |
251 | struct { |
252 | __le32 ; /* node id */ |
253 | __le32 ; /* inode number */ |
254 | __le32 ; /* include cold/fsync/dentry marks and offset */ |
255 | __le64 ; /* checkpoint version */ |
256 | __le32 ; /* next node page block address */ |
257 | } __packed; |
258 | |
259 | /* Address Pointers in an Inode */ |
260 | #define DEF_ADDRS_PER_INODE ((F2FS_BLKSIZE - OFFSET_OF_END_OF_I_EXT \ |
261 | - SIZE_OF_I_NID \ |
262 | - sizeof(struct node_footer)) / sizeof(__le32)) |
263 | #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ |
264 | get_extra_isize(inode)) |
265 | #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ |
266 | #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) |
267 | /* Address Pointers in a Direct Block */ |
268 | #define DEF_ADDRS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32)) |
269 | #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) |
270 | /* Node IDs in an Indirect Block */ |
271 | #define NIDS_PER_BLOCK ((F2FS_BLKSIZE - sizeof(struct node_footer)) / sizeof(__le32)) |
272 | |
273 | #define ADDRS_PER_PAGE(page, inode) \ |
274 | (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) |
275 | |
276 | #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) |
277 | #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) |
278 | #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) |
279 | #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) |
280 | #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) |
281 | |
282 | #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ |
283 | #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ |
284 | #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ |
285 | #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ |
286 | #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ |
287 | #define 0x20 /* file having extra attribute */ |
288 | #define F2FS_PIN_FILE 0x40 /* file should not be gced */ |
289 | #define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */ |
290 | |
291 | struct f2fs_inode { |
292 | __le16 i_mode; /* file mode */ |
293 | __u8 i_advise; /* file hints */ |
294 | __u8 i_inline; /* file inline flags */ |
295 | __le32 i_uid; /* user ID */ |
296 | __le32 i_gid; /* group ID */ |
297 | __le32 i_links; /* links count */ |
298 | __le64 i_size; /* file size in bytes */ |
299 | __le64 i_blocks; /* file size in blocks */ |
300 | __le64 i_atime; /* access time */ |
301 | __le64 i_ctime; /* change time */ |
302 | __le64 i_mtime; /* modification time */ |
303 | __le32 i_atime_nsec; /* access time in nano scale */ |
304 | __le32 i_ctime_nsec; /* change time in nano scale */ |
305 | __le32 i_mtime_nsec; /* modification time in nano scale */ |
306 | __le32 i_generation; /* file version (for NFS) */ |
307 | union { |
308 | __le32 i_current_depth; /* only for directory depth */ |
309 | __le16 i_gc_failures; /* |
310 | * # of gc failures on pinned file. |
311 | * only for regular files. |
312 | */ |
313 | }; |
314 | __le32 i_xattr_nid; /* nid to save xattr */ |
315 | __le32 i_flags; /* file attributes */ |
316 | __le32 i_pino; /* parent inode number */ |
317 | __le32 i_namelen; /* file name length */ |
318 | __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ |
319 | __u8 i_dir_level; /* dentry_level for large dir */ |
320 | |
321 | struct f2fs_extent i_ext; /* caching a largest extent */ |
322 | |
323 | union { |
324 | struct { |
325 | __le16 ; /* extra inode attribute size */ |
326 | __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ |
327 | __le32 i_projid; /* project id */ |
328 | __le32 i_inode_checksum;/* inode meta checksum */ |
329 | __le64 i_crtime; /* creation time */ |
330 | __le32 i_crtime_nsec; /* creation time in nano scale */ |
331 | __le64 i_compr_blocks; /* # of compressed blocks */ |
332 | __u8 i_compress_algorithm; /* compress algorithm */ |
333 | __u8 i_log_cluster_size; /* log of cluster size */ |
334 | __le16 i_compress_flag; /* compress flag */ |
335 | /* 0 bit: chksum flag |
336 | * [8,15] bits: compress level |
337 | */ |
338 | __le32 [0]; /* for attribute size calculation */ |
339 | } __packed; |
340 | __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ |
341 | }; |
342 | __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), |
343 | double_indirect(1) node id */ |
344 | } __packed; |
345 | |
346 | struct direct_node { |
347 | __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ |
348 | } __packed; |
349 | |
350 | struct indirect_node { |
351 | __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ |
352 | } __packed; |
353 | |
354 | enum { |
355 | COLD_BIT_SHIFT = 0, |
356 | FSYNC_BIT_SHIFT, |
357 | DENT_BIT_SHIFT, |
358 | OFFSET_BIT_SHIFT |
359 | }; |
360 | |
361 | #define OFFSET_BIT_MASK GENMASK(OFFSET_BIT_SHIFT - 1, 0) |
362 | |
363 | struct f2fs_node { |
364 | /* can be one of three types: inode, direct, and indirect types */ |
365 | union { |
366 | struct f2fs_inode i; |
367 | struct direct_node dn; |
368 | struct indirect_node in; |
369 | }; |
370 | struct node_footer ; |
371 | } __packed; |
372 | |
373 | /* |
374 | * For NAT entries |
375 | */ |
376 | #define NAT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / sizeof(struct f2fs_nat_entry)) |
377 | |
378 | struct f2fs_nat_entry { |
379 | __u8 version; /* latest version of cached nat entry */ |
380 | __le32 ino; /* inode number */ |
381 | __le32 block_addr; /* block address */ |
382 | } __packed; |
383 | |
384 | struct f2fs_nat_block { |
385 | struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; |
386 | } __packed; |
387 | |
388 | /* |
389 | * For SIT entries |
390 | * |
391 | * A validity bitmap of 64 bytes covers 512 blocks of area. For a 4K page size, |
392 | * this results in a segment size of 2MB. For 16k pages, the default segment size |
393 | * is 8MB. |
394 | * Not allow to change this. |
395 | */ |
396 | #define SIT_VBLOCK_MAP_SIZE 64 |
397 | #define SIT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / sizeof(struct f2fs_sit_entry)) |
398 | |
399 | /* |
400 | * F2FS uses 4 bytes to represent block address. As a result, supported size of |
401 | * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. |
402 | */ |
403 | #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) |
404 | |
405 | /* |
406 | * Note that f2fs_sit_entry->vblocks has the following bit-field information. |
407 | * [15:10] : allocation type such as CURSEG_XXXX_TYPE |
408 | * [9:0] : valid block count |
409 | */ |
410 | #define SIT_VBLOCKS_SHIFT 10 |
411 | #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) |
412 | #define GET_SIT_VBLOCKS(raw_sit) \ |
413 | (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) |
414 | #define GET_SIT_TYPE(raw_sit) \ |
415 | ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ |
416 | >> SIT_VBLOCKS_SHIFT) |
417 | |
418 | struct f2fs_sit_entry { |
419 | __le16 vblocks; /* reference above */ |
420 | __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ |
421 | __le64 mtime; /* segment age for cleaning */ |
422 | } __packed; |
423 | |
424 | struct f2fs_sit_block { |
425 | struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; |
426 | } __packed; |
427 | |
428 | /* |
429 | * For segment summary |
430 | * |
431 | * One summary block contains exactly 512 summary entries, which represents |
432 | * exactly one segment by default. Not allow to change the basic units. |
433 | * |
434 | * NOTE: For initializing fields, you must use set_summary |
435 | * |
436 | * - If data page, nid represents dnode's nid |
437 | * - If node page, nid represents the node page's nid. |
438 | * |
439 | * The ofs_in_node is used by only data page. It represents offset |
440 | * from node's page's beginning to get a data block address. |
441 | * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) |
442 | */ |
443 | #define ENTRIES_IN_SUM (F2FS_BLKSIZE / 8) |
444 | #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ |
445 | #define (5) /* sizeof(struct summary_footer) */ |
446 | #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) |
447 | |
448 | /* a summary entry for a block in a segment */ |
449 | struct f2fs_summary { |
450 | __le32 nid; /* parent node id */ |
451 | union { |
452 | __u8 reserved[3]; |
453 | struct { |
454 | __u8 version; /* node version number */ |
455 | __le16 ofs_in_node; /* block index in parent node */ |
456 | } __packed; |
457 | }; |
458 | } __packed; |
459 | |
460 | /* summary block type, node or data, is stored to the summary_footer */ |
461 | #define SUM_TYPE_NODE (1) |
462 | #define SUM_TYPE_DATA (0) |
463 | |
464 | struct { |
465 | unsigned char ; /* SUM_TYPE_XXX */ |
466 | __le32 ; /* summary checksum */ |
467 | } __packed; |
468 | |
469 | #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ |
470 | SUM_ENTRY_SIZE) |
471 | #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ |
472 | sizeof(struct nat_journal_entry)) |
473 | #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ |
474 | sizeof(struct nat_journal_entry)) |
475 | #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ |
476 | sizeof(struct sit_journal_entry)) |
477 | #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ |
478 | sizeof(struct sit_journal_entry)) |
479 | |
480 | /* Reserved area should make size of f2fs_extra_info equals to |
481 | * that of nat_journal and sit_journal. |
482 | */ |
483 | #define (SUM_JOURNAL_SIZE - 2 - 8) |
484 | |
485 | /* |
486 | * frequently updated NAT/SIT entries can be stored in the spare area in |
487 | * summary blocks |
488 | */ |
489 | enum { |
490 | NAT_JOURNAL = 0, |
491 | SIT_JOURNAL |
492 | }; |
493 | |
494 | struct nat_journal_entry { |
495 | __le32 nid; |
496 | struct f2fs_nat_entry ne; |
497 | } __packed; |
498 | |
499 | struct nat_journal { |
500 | struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; |
501 | __u8 reserved[NAT_JOURNAL_RESERVED]; |
502 | } __packed; |
503 | |
504 | struct sit_journal_entry { |
505 | __le32 segno; |
506 | struct f2fs_sit_entry se; |
507 | } __packed; |
508 | |
509 | struct sit_journal { |
510 | struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; |
511 | __u8 reserved[SIT_JOURNAL_RESERVED]; |
512 | } __packed; |
513 | |
514 | struct { |
515 | __le64 ; |
516 | __u8 [EXTRA_INFO_RESERVED]; |
517 | } __packed; |
518 | |
519 | struct f2fs_journal { |
520 | union { |
521 | __le16 n_nats; |
522 | __le16 n_sits; |
523 | }; |
524 | /* spare area is used by NAT or SIT journals or extra info */ |
525 | union { |
526 | struct nat_journal nat_j; |
527 | struct sit_journal sit_j; |
528 | struct f2fs_extra_info info; |
529 | }; |
530 | } __packed; |
531 | |
532 | /* Block-sized summary block structure */ |
533 | struct f2fs_summary_block { |
534 | struct f2fs_summary entries[ENTRIES_IN_SUM]; |
535 | struct f2fs_journal journal; |
536 | struct summary_footer ; |
537 | } __packed; |
538 | |
539 | /* |
540 | * For directory operations |
541 | */ |
542 | #define F2FS_DOT_HASH 0 |
543 | #define F2FS_DDOT_HASH F2FS_DOT_HASH |
544 | #define F2FS_MAX_HASH (~((0x3ULL) << 62)) |
545 | #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) |
546 | |
547 | typedef __le32 f2fs_hash_t; |
548 | |
549 | /* One directory entry slot covers 8bytes-long file name */ |
550 | #define F2FS_SLOT_LEN 8 |
551 | #define F2FS_SLOT_LEN_BITS 3 |
552 | |
553 | #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) |
554 | |
555 | /* MAX level for dir lookup */ |
556 | #define MAX_DIR_HASH_DEPTH 63 |
557 | |
558 | /* MAX buckets in one level of dir */ |
559 | #define MAX_DIR_BUCKETS BIT((MAX_DIR_HASH_DEPTH / 2) - 1) |
560 | |
561 | /* |
562 | * space utilization of regular dentry and inline dentry (w/o extra reservation) |
563 | * regular dentry inline dentry (def) inline dentry (min) |
564 | * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 |
565 | * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 |
566 | * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 |
567 | * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 |
568 | * total 4096 3488 40 |
569 | * |
570 | * Note: there are more reserved space in inline dentry than in regular |
571 | * dentry, when converting inline dentry we should handle this carefully. |
572 | */ |
573 | |
574 | /* the number of dentry in a block */ |
575 | #define NR_DENTRY_IN_BLOCK ((BITS_PER_BYTE * F2FS_BLKSIZE) / \ |
576 | ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * BITS_PER_BYTE + 1)) |
577 | #define SIZE_OF_DIR_ENTRY 11 /* by byte */ |
578 | #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ |
579 | BITS_PER_BYTE) |
580 | #define SIZE_OF_RESERVED (F2FS_BLKSIZE - ((SIZE_OF_DIR_ENTRY + \ |
581 | F2FS_SLOT_LEN) * \ |
582 | NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) |
583 | #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ |
584 | |
585 | /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ |
586 | struct f2fs_dir_entry { |
587 | __le32 hash_code; /* hash code of file name */ |
588 | __le32 ino; /* inode number */ |
589 | __le16 name_len; /* length of file name */ |
590 | __u8 file_type; /* file type */ |
591 | } __packed; |
592 | |
593 | /* Block-sized directory entry block */ |
594 | struct f2fs_dentry_block { |
595 | /* validity bitmap for directory entries in each block */ |
596 | __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; |
597 | __u8 reserved[SIZE_OF_RESERVED]; |
598 | struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; |
599 | __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; |
600 | } __packed; |
601 | |
602 | #define F2FS_DEF_PROJID 0 /* default project ID */ |
603 | |
604 | #endif /* _LINUX_F2FS_FS_H */ |
605 | |