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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _BCACHEFS_FORMAT_H | |
3 | #define _BCACHEFS_FORMAT_H | |
4 | ||
5 | /* | |
6 | * bcachefs on disk data structures | |
7 | * | |
8 | * OVERVIEW: | |
9 | * | |
10 | * There are three main types of on disk data structures in bcachefs (this is | |
11 | * reduced from 5 in bcache) | |
12 | * | |
13 | * - superblock | |
14 | * - journal | |
15 | * - btree | |
16 | * | |
17 | * The btree is the primary structure; most metadata exists as keys in the | |
18 | * various btrees. There are only a small number of btrees, they're not | |
19 | * sharded - we have one btree for extents, another for inodes, et cetera. | |
20 | * | |
21 | * SUPERBLOCK: | |
22 | * | |
23 | * The superblock contains the location of the journal, the list of devices in | |
24 | * the filesystem, and in general any metadata we need in order to decide | |
25 | * whether we can start a filesystem or prior to reading the journal/btree | |
26 | * roots. | |
27 | * | |
28 | * The superblock is extensible, and most of the contents of the superblock are | |
29 | * in variable length, type tagged fields; see struct bch_sb_field. | |
30 | * | |
31 | * Backup superblocks do not reside in a fixed location; also, superblocks do | |
32 | * not have a fixed size. To locate backup superblocks we have struct | |
33 | * bch_sb_layout; we store a copy of this inside every superblock, and also | |
34 | * before the first superblock. | |
35 | * | |
36 | * JOURNAL: | |
37 | * | |
38 | * The journal primarily records btree updates in the order they occurred; | |
39 | * journal replay consists of just iterating over all the keys in the open | |
40 | * journal entries and re-inserting them into the btrees. | |
41 | * | |
42 | * The journal also contains entry types for the btree roots, and blacklisted | |
43 | * journal sequence numbers (see journal_seq_blacklist.c). | |
44 | * | |
45 | * BTREE: | |
46 | * | |
47 | * bcachefs btrees are copy on write b+ trees, where nodes are big (typically | |
48 | * 128k-256k) and log structured. We use struct btree_node for writing the first | |
49 | * entry in a given node (offset 0), and struct btree_node_entry for all | |
50 | * subsequent writes. | |
51 | * | |
52 | * After the header, btree node entries contain a list of keys in sorted order. | |
53 | * Values are stored inline with the keys; since values are variable length (and | |
54 | * keys effectively are variable length too, due to packing) we can't do random | |
55 | * access without building up additional in memory tables in the btree node read | |
56 | * path. | |
57 | * | |
58 | * BTREE KEYS (struct bkey): | |
59 | * | |
60 | * The various btrees share a common format for the key - so as to avoid | |
61 | * switching in fastpath lookup/comparison code - but define their own | |
62 | * structures for the key values. | |
63 | * | |
64 | * The size of a key/value pair is stored as a u8 in units of u64s, so the max | |
65 | * size is just under 2k. The common part also contains a type tag for the | |
66 | * value, and a format field indicating whether the key is packed or not (and | |
67 | * also meant to allow adding new key fields in the future, if desired). | |
68 | * | |
69 | * bkeys, when stored within a btree node, may also be packed. In that case, the | |
70 | * bkey_format in that node is used to unpack it. Packed bkeys mean that we can | |
71 | * be generous with field sizes in the common part of the key format (64 bit | |
72 | * inode number, 64 bit offset, 96 bit version field, etc.) for negligible cost. | |
73 | */ | |
74 | ||
75 | #include <asm/types.h> | |
76 | #include <asm/byteorder.h> | |
7121643e | 77 | #include <linux/kernel.h> |
1c6fdbd8 KO |
78 | #include <linux/uuid.h> |
79 | ||
80 | #ifdef __KERNEL__ | |
81 | typedef uuid_t __uuid_t; | |
82 | #endif | |
83 | ||
84 | #define LE_BITMASK(_bits, name, type, field, offset, end) \ | |
85 | static const unsigned name##_OFFSET = offset; \ | |
86 | static const unsigned name##_BITS = (end - offset); \ | |
87 | static const __u##_bits name##_MAX = (1ULL << (end - offset)) - 1; \ | |
88 | \ | |
89 | static inline __u64 name(const type *k) \ | |
90 | { \ | |
91 | return (__le##_bits##_to_cpu(k->field) >> offset) & \ | |
92 | ~(~0ULL << (end - offset)); \ | |
93 | } \ | |
94 | \ | |
95 | static inline void SET_##name(type *k, __u64 v) \ | |
96 | { \ | |
97 | __u##_bits new = __le##_bits##_to_cpu(k->field); \ | |
98 | \ | |
99 | new &= ~(~(~0ULL << (end - offset)) << offset); \ | |
100 | new |= (v & ~(~0ULL << (end - offset))) << offset; \ | |
101 | k->field = __cpu_to_le##_bits(new); \ | |
102 | } | |
103 | ||
104 | #define LE16_BITMASK(n, t, f, o, e) LE_BITMASK(16, n, t, f, o, e) | |
105 | #define LE32_BITMASK(n, t, f, o, e) LE_BITMASK(32, n, t, f, o, e) | |
106 | #define LE64_BITMASK(n, t, f, o, e) LE_BITMASK(64, n, t, f, o, e) | |
107 | ||
108 | struct bkey_format { | |
109 | __u8 key_u64s; | |
110 | __u8 nr_fields; | |
111 | /* One unused slot for now: */ | |
112 | __u8 bits_per_field[6]; | |
113 | __le64 field_offset[6]; | |
114 | }; | |
115 | ||
116 | /* Btree keys - all units are in sectors */ | |
117 | ||
118 | struct bpos { | |
119 | /* | |
120 | * Word order matches machine byte order - btree code treats a bpos as a | |
121 | * single large integer, for search/comparison purposes | |
122 | * | |
123 | * Note that wherever a bpos is embedded in another on disk data | |
124 | * structure, it has to be byte swabbed when reading in metadata that | |
125 | * wasn't written in native endian order: | |
126 | */ | |
127 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ | |
128 | __u32 snapshot; | |
129 | __u64 offset; | |
130 | __u64 inode; | |
131 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ | |
132 | __u64 inode; | |
133 | __u64 offset; /* Points to end of extent - sectors */ | |
134 | __u32 snapshot; | |
135 | #else | |
136 | #error edit for your odd byteorder. | |
137 | #endif | |
138 | } __attribute__((packed, aligned(4))); | |
139 | ||
140 | #define KEY_INODE_MAX ((__u64)~0ULL) | |
141 | #define KEY_OFFSET_MAX ((__u64)~0ULL) | |
142 | #define KEY_SNAPSHOT_MAX ((__u32)~0U) | |
143 | #define KEY_SIZE_MAX ((__u32)~0U) | |
144 | ||
145 | static inline struct bpos POS(__u64 inode, __u64 offset) | |
146 | { | |
147 | struct bpos ret; | |
148 | ||
149 | ret.inode = inode; | |
150 | ret.offset = offset; | |
151 | ret.snapshot = 0; | |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
156 | #define POS_MIN POS(0, 0) | |
157 | #define POS_MAX POS(KEY_INODE_MAX, KEY_OFFSET_MAX) | |
158 | ||
159 | /* Empty placeholder struct, for container_of() */ | |
160 | struct bch_val { | |
161 | __u64 __nothing[0]; | |
162 | }; | |
163 | ||
164 | struct bversion { | |
165 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ | |
166 | __u64 lo; | |
167 | __u32 hi; | |
168 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ | |
169 | __u32 hi; | |
170 | __u64 lo; | |
171 | #endif | |
172 | } __attribute__((packed, aligned(4))); | |
173 | ||
174 | struct bkey { | |
175 | /* Size of combined key and value, in u64s */ | |
176 | __u8 u64s; | |
177 | ||
178 | /* Format of key (0 for format local to btree node) */ | |
179 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
180 | __u8 format:7, | |
181 | needs_whiteout:1; | |
182 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
183 | __u8 needs_whiteout:1, | |
184 | format:7; | |
185 | #else | |
186 | #error edit for your odd byteorder. | |
187 | #endif | |
188 | ||
189 | /* Type of the value */ | |
190 | __u8 type; | |
191 | ||
192 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ | |
193 | __u8 pad[1]; | |
194 | ||
195 | struct bversion version; | |
196 | __u32 size; /* extent size, in sectors */ | |
197 | struct bpos p; | |
198 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ | |
199 | struct bpos p; | |
200 | __u32 size; /* extent size, in sectors */ | |
201 | struct bversion version; | |
202 | ||
203 | __u8 pad[1]; | |
204 | #endif | |
205 | } __attribute__((packed, aligned(8))); | |
206 | ||
207 | struct bkey_packed { | |
208 | __u64 _data[0]; | |
209 | ||
210 | /* Size of combined key and value, in u64s */ | |
211 | __u8 u64s; | |
212 | ||
213 | /* Format of key (0 for format local to btree node) */ | |
214 | ||
215 | /* | |
216 | * XXX: next incompat on disk format change, switch format and | |
217 | * needs_whiteout - bkey_packed() will be cheaper if format is the high | |
218 | * bits of the bitfield | |
219 | */ | |
220 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
221 | __u8 format:7, | |
222 | needs_whiteout:1; | |
223 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
224 | __u8 needs_whiteout:1, | |
225 | format:7; | |
226 | #endif | |
227 | ||
228 | /* Type of the value */ | |
229 | __u8 type; | |
230 | __u8 key_start[0]; | |
231 | ||
232 | /* | |
233 | * We copy bkeys with struct assignment in various places, and while | |
234 | * that shouldn't be done with packed bkeys we can't disallow it in C, | |
235 | * and it's legal to cast a bkey to a bkey_packed - so padding it out | |
236 | * to the same size as struct bkey should hopefully be safest. | |
237 | */ | |
238 | __u8 pad[sizeof(struct bkey) - 3]; | |
239 | } __attribute__((packed, aligned(8))); | |
240 | ||
241 | #define BKEY_U64s (sizeof(struct bkey) / sizeof(__u64)) | |
cd575ddf KO |
242 | #define BKEY_U64s_MAX U8_MAX |
243 | #define BKEY_VAL_U64s_MAX (BKEY_U64s_MAX - BKEY_U64s) | |
244 | ||
1c6fdbd8 KO |
245 | #define KEY_PACKED_BITS_START 24 |
246 | ||
247 | #define KEY_FORMAT_LOCAL_BTREE 0 | |
248 | #define KEY_FORMAT_CURRENT 1 | |
249 | ||
250 | enum bch_bkey_fields { | |
251 | BKEY_FIELD_INODE, | |
252 | BKEY_FIELD_OFFSET, | |
253 | BKEY_FIELD_SNAPSHOT, | |
254 | BKEY_FIELD_SIZE, | |
255 | BKEY_FIELD_VERSION_HI, | |
256 | BKEY_FIELD_VERSION_LO, | |
257 | BKEY_NR_FIELDS, | |
258 | }; | |
259 | ||
260 | #define bkey_format_field(name, field) \ | |
261 | [BKEY_FIELD_##name] = (sizeof(((struct bkey *) NULL)->field) * 8) | |
262 | ||
263 | #define BKEY_FORMAT_CURRENT \ | |
264 | ((struct bkey_format) { \ | |
265 | .key_u64s = BKEY_U64s, \ | |
266 | .nr_fields = BKEY_NR_FIELDS, \ | |
267 | .bits_per_field = { \ | |
268 | bkey_format_field(INODE, p.inode), \ | |
269 | bkey_format_field(OFFSET, p.offset), \ | |
270 | bkey_format_field(SNAPSHOT, p.snapshot), \ | |
271 | bkey_format_field(SIZE, size), \ | |
272 | bkey_format_field(VERSION_HI, version.hi), \ | |
273 | bkey_format_field(VERSION_LO, version.lo), \ | |
274 | }, \ | |
275 | }) | |
276 | ||
277 | /* bkey with inline value */ | |
278 | struct bkey_i { | |
279 | __u64 _data[0]; | |
280 | ||
281 | union { | |
282 | struct { | |
283 | /* Size of combined key and value, in u64s */ | |
284 | __u8 u64s; | |
285 | }; | |
286 | struct { | |
287 | struct bkey k; | |
288 | struct bch_val v; | |
289 | }; | |
290 | }; | |
291 | }; | |
292 | ||
293 | #define KEY(_inode, _offset, _size) \ | |
294 | ((struct bkey) { \ | |
295 | .u64s = BKEY_U64s, \ | |
296 | .format = KEY_FORMAT_CURRENT, \ | |
297 | .p = POS(_inode, _offset), \ | |
298 | .size = _size, \ | |
299 | }) | |
300 | ||
301 | static inline void bkey_init(struct bkey *k) | |
302 | { | |
303 | *k = KEY(0, 0, 0); | |
304 | } | |
305 | ||
306 | #define bkey_bytes(_k) ((_k)->u64s * sizeof(__u64)) | |
307 | ||
308 | #define __BKEY_PADDED(key, pad) \ | |
309 | struct { struct bkey_i key; __u64 key ## _pad[pad]; } | |
310 | ||
1c6fdbd8 KO |
311 | /* |
312 | * - DELETED keys are used internally to mark keys that should be ignored but | |
313 | * override keys in composition order. Their version number is ignored. | |
314 | * | |
315 | * - DISCARDED keys indicate that the data is all 0s because it has been | |
316 | * discarded. DISCARDs may have a version; if the version is nonzero the key | |
317 | * will be persistent, otherwise the key will be dropped whenever the btree | |
318 | * node is rewritten (like DELETED keys). | |
319 | * | |
320 | * - ERROR: any read of the data returns a read error, as the data was lost due | |
321 | * to a failing device. Like DISCARDED keys, they can be removed (overridden) | |
322 | * by new writes or cluster-wide GC. Node repair can also overwrite them with | |
323 | * the same or a more recent version number, but not with an older version | |
324 | * number. | |
26609b61 KO |
325 | * |
326 | * - WHITEOUT: for hash table btrees | |
1c6fdbd8 | 327 | */ |
26609b61 KO |
328 | #define BCH_BKEY_TYPES() \ |
329 | x(deleted, 0) \ | |
330 | x(discard, 1) \ | |
331 | x(error, 2) \ | |
332 | x(cookie, 3) \ | |
333 | x(whiteout, 4) \ | |
334 | x(btree_ptr, 5) \ | |
335 | x(extent, 6) \ | |
336 | x(reservation, 7) \ | |
337 | x(inode, 8) \ | |
338 | x(inode_generation, 9) \ | |
339 | x(dirent, 10) \ | |
340 | x(xattr, 11) \ | |
341 | x(alloc, 12) \ | |
342 | x(quota, 13) \ | |
343 | x(stripe, 14) | |
344 | ||
345 | enum bch_bkey_type { | |
346 | #define x(name, nr) KEY_TYPE_##name = nr, | |
347 | BCH_BKEY_TYPES() | |
348 | #undef x | |
349 | KEY_TYPE_MAX, | |
350 | }; | |
1c6fdbd8 KO |
351 | |
352 | struct bch_cookie { | |
353 | struct bch_val v; | |
354 | __le64 cookie; | |
355 | }; | |
1c6fdbd8 KO |
356 | |
357 | /* Extents */ | |
358 | ||
359 | /* | |
360 | * In extent bkeys, the value is a list of pointers (bch_extent_ptr), optionally | |
361 | * preceded by checksum/compression information (bch_extent_crc32 or | |
362 | * bch_extent_crc64). | |
363 | * | |
364 | * One major determining factor in the format of extents is how we handle and | |
365 | * represent extents that have been partially overwritten and thus trimmed: | |
366 | * | |
367 | * If an extent is not checksummed or compressed, when the extent is trimmed we | |
368 | * don't have to remember the extent we originally allocated and wrote: we can | |
369 | * merely adjust ptr->offset to point to the start of the data that is currently | |
370 | * live. The size field in struct bkey records the current (live) size of the | |
371 | * extent, and is also used to mean "size of region on disk that we point to" in | |
372 | * this case. | |
373 | * | |
374 | * Thus an extent that is not checksummed or compressed will consist only of a | |
375 | * list of bch_extent_ptrs, with none of the fields in | |
376 | * bch_extent_crc32/bch_extent_crc64. | |
377 | * | |
378 | * When an extent is checksummed or compressed, it's not possible to read only | |
379 | * the data that is currently live: we have to read the entire extent that was | |
380 | * originally written, and then return only the part of the extent that is | |
381 | * currently live. | |
382 | * | |
383 | * Thus, in addition to the current size of the extent in struct bkey, we need | |
384 | * to store the size of the originally allocated space - this is the | |
385 | * compressed_size and uncompressed_size fields in bch_extent_crc32/64. Also, | |
386 | * when the extent is trimmed, instead of modifying the offset field of the | |
387 | * pointer, we keep a second smaller offset field - "offset into the original | |
388 | * extent of the currently live region". | |
389 | * | |
390 | * The other major determining factor is replication and data migration: | |
391 | * | |
392 | * Each pointer may have its own bch_extent_crc32/64. When doing a replicated | |
393 | * write, we will initially write all the replicas in the same format, with the | |
394 | * same checksum type and compression format - however, when copygc runs later (or | |
395 | * tiering/cache promotion, anything that moves data), it is not in general | |
396 | * going to rewrite all the pointers at once - one of the replicas may be in a | |
397 | * bucket on one device that has very little fragmentation while another lives | |
398 | * in a bucket that has become heavily fragmented, and thus is being rewritten | |
399 | * sooner than the rest. | |
400 | * | |
401 | * Thus it will only move a subset of the pointers (or in the case of | |
402 | * tiering/cache promotion perhaps add a single pointer without dropping any | |
403 | * current pointers), and if the extent has been partially overwritten it must | |
404 | * write only the currently live portion (or copygc would not be able to reduce | |
405 | * fragmentation!) - which necessitates a different bch_extent_crc format for | |
406 | * the new pointer. | |
407 | * | |
408 | * But in the interests of space efficiency, we don't want to store one | |
409 | * bch_extent_crc for each pointer if we don't have to. | |
410 | * | |
411 | * Thus, a bch_extent consists of bch_extent_crc32s, bch_extent_crc64s, and | |
412 | * bch_extent_ptrs appended arbitrarily one after the other. We determine the | |
413 | * type of a given entry with a scheme similar to utf8 (except we're encoding a | |
414 | * type, not a size), encoding the type in the position of the first set bit: | |
415 | * | |
416 | * bch_extent_crc32 - 0b1 | |
417 | * bch_extent_ptr - 0b10 | |
418 | * bch_extent_crc64 - 0b100 | |
419 | * | |
420 | * We do it this way because bch_extent_crc32 is _very_ constrained on bits (and | |
421 | * bch_extent_crc64 is the least constrained). | |
422 | * | |
423 | * Then, each bch_extent_crc32/64 applies to the pointers that follow after it, | |
424 | * until the next bch_extent_crc32/64. | |
425 | * | |
426 | * If there are no bch_extent_crcs preceding a bch_extent_ptr, then that pointer | |
427 | * is neither checksummed nor compressed. | |
428 | */ | |
429 | ||
430 | /* 128 bits, sufficient for cryptographic MACs: */ | |
431 | struct bch_csum { | |
432 | __le64 lo; | |
433 | __le64 hi; | |
434 | } __attribute__((packed, aligned(8))); | |
435 | ||
436 | enum bch_csum_type { | |
437 | BCH_CSUM_NONE = 0, | |
438 | BCH_CSUM_CRC32C_NONZERO = 1, | |
439 | BCH_CSUM_CRC64_NONZERO = 2, | |
440 | BCH_CSUM_CHACHA20_POLY1305_80 = 3, | |
441 | BCH_CSUM_CHACHA20_POLY1305_128 = 4, | |
442 | BCH_CSUM_CRC32C = 5, | |
443 | BCH_CSUM_CRC64 = 6, | |
444 | BCH_CSUM_NR = 7, | |
445 | }; | |
446 | ||
447 | static const unsigned bch_crc_bytes[] = { | |
448 | [BCH_CSUM_NONE] = 0, | |
449 | [BCH_CSUM_CRC32C_NONZERO] = 4, | |
450 | [BCH_CSUM_CRC32C] = 4, | |
451 | [BCH_CSUM_CRC64_NONZERO] = 8, | |
452 | [BCH_CSUM_CRC64] = 8, | |
453 | [BCH_CSUM_CHACHA20_POLY1305_80] = 10, | |
454 | [BCH_CSUM_CHACHA20_POLY1305_128] = 16, | |
455 | }; | |
456 | ||
457 | static inline _Bool bch2_csum_type_is_encryption(enum bch_csum_type type) | |
458 | { | |
459 | switch (type) { | |
460 | case BCH_CSUM_CHACHA20_POLY1305_80: | |
461 | case BCH_CSUM_CHACHA20_POLY1305_128: | |
462 | return true; | |
463 | default: | |
464 | return false; | |
465 | } | |
466 | } | |
467 | ||
468 | enum bch_compression_type { | |
469 | BCH_COMPRESSION_NONE = 0, | |
470 | BCH_COMPRESSION_LZ4_OLD = 1, | |
471 | BCH_COMPRESSION_GZIP = 2, | |
472 | BCH_COMPRESSION_LZ4 = 3, | |
473 | BCH_COMPRESSION_ZSTD = 4, | |
474 | BCH_COMPRESSION_NR = 5, | |
475 | }; | |
476 | ||
abce30b7 KO |
477 | #define BCH_EXTENT_ENTRY_TYPES() \ |
478 | x(ptr, 0) \ | |
479 | x(crc32, 1) \ | |
480 | x(crc64, 2) \ | |
cd575ddf KO |
481 | x(crc128, 3) \ |
482 | x(stripe_ptr, 4) | |
483 | #define BCH_EXTENT_ENTRY_MAX 5 | |
abce30b7 | 484 | |
1c6fdbd8 | 485 | enum bch_extent_entry_type { |
abce30b7 KO |
486 | #define x(f, n) BCH_EXTENT_ENTRY_##f = n, |
487 | BCH_EXTENT_ENTRY_TYPES() | |
488 | #undef x | |
1c6fdbd8 KO |
489 | }; |
490 | ||
1c6fdbd8 KO |
491 | /* Compressed/uncompressed size are stored biased by 1: */ |
492 | struct bch_extent_crc32 { | |
493 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
494 | __u32 type:2, | |
495 | _compressed_size:7, | |
496 | _uncompressed_size:7, | |
497 | offset:7, | |
498 | _unused:1, | |
499 | csum_type:4, | |
500 | compression_type:4; | |
501 | __u32 csum; | |
502 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
503 | __u32 csum; | |
504 | __u32 compression_type:4, | |
505 | csum_type:4, | |
506 | _unused:1, | |
507 | offset:7, | |
508 | _uncompressed_size:7, | |
509 | _compressed_size:7, | |
510 | type:2; | |
511 | #endif | |
512 | } __attribute__((packed, aligned(8))); | |
513 | ||
514 | #define CRC32_SIZE_MAX (1U << 7) | |
515 | #define CRC32_NONCE_MAX 0 | |
516 | ||
517 | struct bch_extent_crc64 { | |
518 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
519 | __u64 type:3, | |
520 | _compressed_size:9, | |
521 | _uncompressed_size:9, | |
522 | offset:9, | |
523 | nonce:10, | |
524 | csum_type:4, | |
525 | compression_type:4, | |
526 | csum_hi:16; | |
527 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
528 | __u64 csum_hi:16, | |
529 | compression_type:4, | |
530 | csum_type:4, | |
531 | nonce:10, | |
532 | offset:9, | |
533 | _uncompressed_size:9, | |
534 | _compressed_size:9, | |
535 | type:3; | |
536 | #endif | |
537 | __u64 csum_lo; | |
538 | } __attribute__((packed, aligned(8))); | |
539 | ||
540 | #define CRC64_SIZE_MAX (1U << 9) | |
541 | #define CRC64_NONCE_MAX ((1U << 10) - 1) | |
542 | ||
543 | struct bch_extent_crc128 { | |
544 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
545 | __u64 type:4, | |
546 | _compressed_size:13, | |
547 | _uncompressed_size:13, | |
548 | offset:13, | |
549 | nonce:13, | |
550 | csum_type:4, | |
551 | compression_type:4; | |
552 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
553 | __u64 compression_type:4, | |
554 | csum_type:4, | |
555 | nonce:13, | |
556 | offset:13, | |
557 | _uncompressed_size:13, | |
558 | _compressed_size:13, | |
559 | type:4; | |
560 | #endif | |
561 | struct bch_csum csum; | |
562 | } __attribute__((packed, aligned(8))); | |
563 | ||
564 | #define CRC128_SIZE_MAX (1U << 13) | |
565 | #define CRC128_NONCE_MAX ((1U << 13) - 1) | |
566 | ||
567 | /* | |
568 | * @reservation - pointer hasn't been written to, just reserved | |
569 | */ | |
570 | struct bch_extent_ptr { | |
571 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
572 | __u64 type:1, | |
573 | cached:1, | |
cd575ddf | 574 | unused:1, |
1c6fdbd8 KO |
575 | reservation:1, |
576 | offset:44, /* 8 petabytes */ | |
577 | dev:8, | |
578 | gen:8; | |
579 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
580 | __u64 gen:8, | |
581 | dev:8, | |
582 | offset:44, | |
583 | reservation:1, | |
cd575ddf | 584 | unused:1, |
1c6fdbd8 KO |
585 | cached:1, |
586 | type:1; | |
587 | #endif | |
588 | } __attribute__((packed, aligned(8))); | |
589 | ||
cd575ddf | 590 | struct bch_extent_stripe_ptr { |
1c6fdbd8 KO |
591 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
592 | __u64 type:5, | |
cd575ddf KO |
593 | block:8, |
594 | idx:51; | |
595 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
596 | __u64 idx:51, | |
597 | block:8, | |
598 | type:5; | |
599 | #endif | |
600 | }; | |
601 | ||
602 | struct bch_extent_reservation { | |
603 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
604 | __u64 type:6, | |
605 | unused:22, | |
1c6fdbd8 KO |
606 | replicas:4, |
607 | generation:32; | |
608 | #elif defined (__BIG_ENDIAN_BITFIELD) | |
609 | __u64 generation:32, | |
610 | replicas:4, | |
cd575ddf KO |
611 | unused:22, |
612 | type:6; | |
1c6fdbd8 KO |
613 | #endif |
614 | }; | |
615 | ||
616 | union bch_extent_entry { | |
617 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ || __BITS_PER_LONG == 64 | |
618 | unsigned long type; | |
619 | #elif __BITS_PER_LONG == 32 | |
620 | struct { | |
621 | unsigned long pad; | |
622 | unsigned long type; | |
623 | }; | |
624 | #else | |
625 | #error edit for your odd byteorder. | |
626 | #endif | |
abce30b7 KO |
627 | |
628 | #define x(f, n) struct bch_extent_##f f; | |
629 | BCH_EXTENT_ENTRY_TYPES() | |
630 | #undef x | |
1c6fdbd8 KO |
631 | }; |
632 | ||
26609b61 KO |
633 | struct bch_btree_ptr { |
634 | struct bch_val v; | |
1c6fdbd8 | 635 | |
26609b61 KO |
636 | __u64 _data[0]; |
637 | struct bch_extent_ptr start[]; | |
638 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 KO |
639 | |
640 | struct bch_extent { | |
641 | struct bch_val v; | |
642 | ||
643 | __u64 _data[0]; | |
644 | union bch_extent_entry start[]; | |
645 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 KO |
646 | |
647 | struct bch_reservation { | |
648 | struct bch_val v; | |
649 | ||
650 | __le32 generation; | |
651 | __u8 nr_replicas; | |
652 | __u8 pad[3]; | |
653 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 KO |
654 | |
655 | /* Maximum size (in u64s) a single pointer could be: */ | |
656 | #define BKEY_EXTENT_PTR_U64s_MAX\ | |
657 | ((sizeof(struct bch_extent_crc128) + \ | |
658 | sizeof(struct bch_extent_ptr)) / sizeof(u64)) | |
659 | ||
660 | /* Maximum possible size of an entire extent value: */ | |
661 | #define BKEY_EXTENT_VAL_U64s_MAX \ | |
662 | (BKEY_EXTENT_PTR_U64s_MAX * (BCH_REPLICAS_MAX + 1)) | |
663 | ||
664 | #define BKEY_PADDED(key) __BKEY_PADDED(key, BKEY_EXTENT_VAL_U64s_MAX) | |
665 | ||
666 | /* * Maximum possible size of an entire extent, key + value: */ | |
667 | #define BKEY_EXTENT_U64s_MAX (BKEY_U64s + BKEY_EXTENT_VAL_U64s_MAX) | |
668 | ||
669 | /* Btree pointers don't carry around checksums: */ | |
670 | #define BKEY_BTREE_PTR_VAL_U64s_MAX \ | |
671 | ((sizeof(struct bch_extent_ptr)) / sizeof(u64) * BCH_REPLICAS_MAX) | |
672 | #define BKEY_BTREE_PTR_U64s_MAX \ | |
673 | (BKEY_U64s + BKEY_BTREE_PTR_VAL_U64s_MAX) | |
674 | ||
675 | /* Inodes */ | |
676 | ||
677 | #define BLOCKDEV_INODE_MAX 4096 | |
678 | ||
679 | #define BCACHEFS_ROOT_INO 4096 | |
680 | ||
1c6fdbd8 KO |
681 | struct bch_inode { |
682 | struct bch_val v; | |
683 | ||
684 | __le64 bi_hash_seed; | |
685 | __le32 bi_flags; | |
686 | __le16 bi_mode; | |
687 | __u8 fields[0]; | |
688 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 KO |
689 | |
690 | struct bch_inode_generation { | |
691 | struct bch_val v; | |
692 | ||
693 | __le32 bi_generation; | |
694 | __le32 pad; | |
695 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 | 696 | |
a3e70fb2 KO |
697 | #define BCH_INODE_FIELDS() \ |
698 | x(bi_atime, 64) \ | |
699 | x(bi_ctime, 64) \ | |
700 | x(bi_mtime, 64) \ | |
701 | x(bi_otime, 64) \ | |
702 | x(bi_size, 64) \ | |
703 | x(bi_sectors, 64) \ | |
704 | x(bi_uid, 32) \ | |
705 | x(bi_gid, 32) \ | |
706 | x(bi_nlink, 32) \ | |
707 | x(bi_generation, 32) \ | |
708 | x(bi_dev, 32) \ | |
709 | x(bi_data_checksum, 8) \ | |
710 | x(bi_compression, 8) \ | |
711 | x(bi_project, 32) \ | |
712 | x(bi_background_compression, 8) \ | |
713 | x(bi_data_replicas, 8) \ | |
714 | x(bi_promote_target, 16) \ | |
715 | x(bi_foreground_target, 16) \ | |
716 | x(bi_background_target, 16) \ | |
721d4ad8 KO |
717 | x(bi_erasure_code, 16) \ |
718 | x(bi_fields_set, 16) | |
a3e70fb2 | 719 | |
d42dd4ad KO |
720 | /* subset of BCH_INODE_FIELDS */ |
721 | #define BCH_INODE_OPTS() \ | |
722 | x(data_checksum, 8) \ | |
723 | x(compression, 8) \ | |
724 | x(project, 32) \ | |
725 | x(background_compression, 8) \ | |
726 | x(data_replicas, 8) \ | |
727 | x(promote_target, 16) \ | |
728 | x(foreground_target, 16) \ | |
729 | x(background_target, 16) \ | |
730 | x(erasure_code, 16) | |
1c6fdbd8 | 731 | |
721d4ad8 KO |
732 | enum inode_opt_id { |
733 | #define x(name, ...) \ | |
734 | Inode_opt_##name, | |
735 | BCH_INODE_OPTS() | |
736 | #undef x | |
737 | Inode_opt_nr, | |
738 | }; | |
739 | ||
1c6fdbd8 KO |
740 | enum { |
741 | /* | |
742 | * User flags (get/settable with FS_IOC_*FLAGS, correspond to FS_*_FL | |
743 | * flags) | |
744 | */ | |
745 | __BCH_INODE_SYNC = 0, | |
746 | __BCH_INODE_IMMUTABLE = 1, | |
747 | __BCH_INODE_APPEND = 2, | |
748 | __BCH_INODE_NODUMP = 3, | |
749 | __BCH_INODE_NOATIME = 4, | |
750 | ||
751 | __BCH_INODE_I_SIZE_DIRTY= 5, | |
752 | __BCH_INODE_I_SECTORS_DIRTY= 6, | |
753 | __BCH_INODE_UNLINKED = 7, | |
754 | ||
755 | /* bits 20+ reserved for packed fields below: */ | |
756 | }; | |
757 | ||
758 | #define BCH_INODE_SYNC (1 << __BCH_INODE_SYNC) | |
759 | #define BCH_INODE_IMMUTABLE (1 << __BCH_INODE_IMMUTABLE) | |
760 | #define BCH_INODE_APPEND (1 << __BCH_INODE_APPEND) | |
761 | #define BCH_INODE_NODUMP (1 << __BCH_INODE_NODUMP) | |
762 | #define BCH_INODE_NOATIME (1 << __BCH_INODE_NOATIME) | |
763 | #define BCH_INODE_I_SIZE_DIRTY (1 << __BCH_INODE_I_SIZE_DIRTY) | |
764 | #define BCH_INODE_I_SECTORS_DIRTY (1 << __BCH_INODE_I_SECTORS_DIRTY) | |
765 | #define BCH_INODE_UNLINKED (1 << __BCH_INODE_UNLINKED) | |
766 | ||
767 | LE32_BITMASK(INODE_STR_HASH, struct bch_inode, bi_flags, 20, 24); | |
768 | LE32_BITMASK(INODE_NR_FIELDS, struct bch_inode, bi_flags, 24, 32); | |
769 | ||
1c6fdbd8 KO |
770 | /* Dirents */ |
771 | ||
772 | /* | |
773 | * Dirents (and xattrs) have to implement string lookups; since our b-tree | |
774 | * doesn't support arbitrary length strings for the key, we instead index by a | |
775 | * 64 bit hash (currently truncated sha1) of the string, stored in the offset | |
776 | * field of the key - using linear probing to resolve hash collisions. This also | |
777 | * provides us with the readdir cookie posix requires. | |
778 | * | |
779 | * Linear probing requires us to use whiteouts for deletions, in the event of a | |
780 | * collision: | |
781 | */ | |
782 | ||
1c6fdbd8 KO |
783 | struct bch_dirent { |
784 | struct bch_val v; | |
785 | ||
786 | /* Target inode number: */ | |
787 | __le64 d_inum; | |
788 | ||
789 | /* | |
790 | * Copy of mode bits 12-15 from the target inode - so userspace can get | |
791 | * the filetype without having to do a stat() | |
792 | */ | |
793 | __u8 d_type; | |
794 | ||
795 | __u8 d_name[]; | |
796 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 KO |
797 | |
798 | #define BCH_NAME_MAX (U8_MAX * sizeof(u64) - \ | |
799 | sizeof(struct bkey) - \ | |
800 | offsetof(struct bch_dirent, d_name)) | |
801 | ||
802 | ||
803 | /* Xattrs */ | |
804 | ||
26609b61 KO |
805 | #define KEY_TYPE_XATTR_INDEX_USER 0 |
806 | #define KEY_TYPE_XATTR_INDEX_POSIX_ACL_ACCESS 1 | |
807 | #define KEY_TYPE_XATTR_INDEX_POSIX_ACL_DEFAULT 2 | |
808 | #define KEY_TYPE_XATTR_INDEX_TRUSTED 3 | |
809 | #define KEY_TYPE_XATTR_INDEX_SECURITY 4 | |
1c6fdbd8 KO |
810 | |
811 | struct bch_xattr { | |
812 | struct bch_val v; | |
813 | __u8 x_type; | |
814 | __u8 x_name_len; | |
815 | __le16 x_val_len; | |
816 | __u8 x_name[]; | |
817 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 KO |
818 | |
819 | /* Bucket/allocation information: */ | |
820 | ||
1c6fdbd8 KO |
821 | struct bch_alloc { |
822 | struct bch_val v; | |
823 | __u8 fields; | |
824 | __u8 gen; | |
825 | __u8 data[]; | |
826 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 | 827 | |
90541a74 | 828 | #define BCH_ALLOC_FIELDS() \ |
8fe826f9 KO |
829 | x(read_time, 16) \ |
830 | x(write_time, 16) \ | |
831 | x(data_type, 8) \ | |
832 | x(dirty_sectors, 16) \ | |
833 | x(cached_sectors, 16) \ | |
834 | x(oldest_gen, 8) | |
90541a74 KO |
835 | |
836 | enum { | |
837 | #define x(name, bytes) BCH_ALLOC_FIELD_##name, | |
838 | BCH_ALLOC_FIELDS() | |
839 | #undef x | |
840 | BCH_ALLOC_FIELD_NR | |
841 | }; | |
842 | ||
843 | static const unsigned BCH_ALLOC_FIELD_BYTES[] = { | |
8fe826f9 | 844 | #define x(name, bits) [BCH_ALLOC_FIELD_##name] = bits / 8, |
90541a74 KO |
845 | BCH_ALLOC_FIELDS() |
846 | #undef x | |
847 | }; | |
848 | ||
8fe826f9 | 849 | #define x(name, bits) + (bits / 8) |
90541a74 KO |
850 | static const unsigned BKEY_ALLOC_VAL_U64s_MAX = |
851 | DIV_ROUND_UP(offsetof(struct bch_alloc, data) | |
852 | BCH_ALLOC_FIELDS(), sizeof(u64)); | |
853 | #undef x | |
854 | ||
1c6fdbd8 KO |
855 | /* Quotas: */ |
856 | ||
1c6fdbd8 KO |
857 | enum quota_types { |
858 | QTYP_USR = 0, | |
859 | QTYP_GRP = 1, | |
860 | QTYP_PRJ = 2, | |
861 | QTYP_NR = 3, | |
862 | }; | |
863 | ||
864 | enum quota_counters { | |
865 | Q_SPC = 0, | |
866 | Q_INO = 1, | |
867 | Q_COUNTERS = 2, | |
868 | }; | |
869 | ||
870 | struct bch_quota_counter { | |
871 | __le64 hardlimit; | |
872 | __le64 softlimit; | |
873 | }; | |
874 | ||
875 | struct bch_quota { | |
876 | struct bch_val v; | |
877 | struct bch_quota_counter c[Q_COUNTERS]; | |
878 | } __attribute__((packed, aligned(8))); | |
1c6fdbd8 | 879 | |
cd575ddf KO |
880 | /* Erasure coding */ |
881 | ||
cd575ddf KO |
882 | struct bch_stripe { |
883 | struct bch_val v; | |
884 | __le16 sectors; | |
885 | __u8 algorithm; | |
886 | __u8 nr_blocks; | |
887 | __u8 nr_redundant; | |
888 | ||
889 | __u8 csum_granularity_bits; | |
890 | __u8 csum_type; | |
891 | __u8 pad; | |
892 | ||
893 | struct bch_extent_ptr ptrs[0]; | |
894 | } __attribute__((packed, aligned(8))); | |
cd575ddf | 895 | |
1c6fdbd8 KO |
896 | /* Optional/variable size superblock sections: */ |
897 | ||
898 | struct bch_sb_field { | |
899 | __u64 _data[0]; | |
900 | __le32 u64s; | |
901 | __le32 type; | |
902 | }; | |
903 | ||
904 | #define BCH_SB_FIELDS() \ | |
905 | x(journal, 0) \ | |
906 | x(members, 1) \ | |
907 | x(crypt, 2) \ | |
af9d3bc2 | 908 | x(replicas_v0, 3) \ |
1c6fdbd8 KO |
909 | x(quota, 4) \ |
910 | x(disk_groups, 5) \ | |
af9d3bc2 | 911 | x(clean, 6) \ |
1dd7f9d9 KO |
912 | x(replicas, 7) \ |
913 | x(journal_seq_blacklist, 8) | |
1c6fdbd8 KO |
914 | |
915 | enum bch_sb_field_type { | |
916 | #define x(f, nr) BCH_SB_FIELD_##f = nr, | |
917 | BCH_SB_FIELDS() | |
918 | #undef x | |
919 | BCH_SB_FIELD_NR | |
920 | }; | |
921 | ||
922 | /* BCH_SB_FIELD_journal: */ | |
923 | ||
924 | struct bch_sb_field_journal { | |
925 | struct bch_sb_field field; | |
926 | __le64 buckets[0]; | |
927 | }; | |
928 | ||
929 | /* BCH_SB_FIELD_members: */ | |
930 | ||
8b335bae KO |
931 | #define BCH_MIN_NR_NBUCKETS (1 << 6) |
932 | ||
1c6fdbd8 KO |
933 | struct bch_member { |
934 | __uuid_t uuid; | |
935 | __le64 nbuckets; /* device size */ | |
936 | __le16 first_bucket; /* index of first bucket used */ | |
937 | __le16 bucket_size; /* sectors */ | |
938 | __le32 pad; | |
939 | __le64 last_mount; /* time_t */ | |
940 | ||
941 | __le64 flags[2]; | |
942 | }; | |
943 | ||
944 | LE64_BITMASK(BCH_MEMBER_STATE, struct bch_member, flags[0], 0, 4) | |
945 | /* 4-10 unused, was TIER, HAS_(META)DATA */ | |
946 | LE64_BITMASK(BCH_MEMBER_REPLACEMENT, struct bch_member, flags[0], 10, 14) | |
947 | LE64_BITMASK(BCH_MEMBER_DISCARD, struct bch_member, flags[0], 14, 15) | |
948 | LE64_BITMASK(BCH_MEMBER_DATA_ALLOWED, struct bch_member, flags[0], 15, 20) | |
949 | LE64_BITMASK(BCH_MEMBER_GROUP, struct bch_member, flags[0], 20, 28) | |
950 | LE64_BITMASK(BCH_MEMBER_DURABILITY, struct bch_member, flags[0], 28, 30) | |
951 | ||
952 | #define BCH_TIER_MAX 4U | |
953 | ||
954 | #if 0 | |
955 | LE64_BITMASK(BCH_MEMBER_NR_READ_ERRORS, struct bch_member, flags[1], 0, 20); | |
956 | LE64_BITMASK(BCH_MEMBER_NR_WRITE_ERRORS,struct bch_member, flags[1], 20, 40); | |
957 | #endif | |
958 | ||
959 | enum bch_member_state { | |
960 | BCH_MEMBER_STATE_RW = 0, | |
961 | BCH_MEMBER_STATE_RO = 1, | |
962 | BCH_MEMBER_STATE_FAILED = 2, | |
963 | BCH_MEMBER_STATE_SPARE = 3, | |
964 | BCH_MEMBER_STATE_NR = 4, | |
965 | }; | |
966 | ||
967 | enum cache_replacement { | |
968 | CACHE_REPLACEMENT_LRU = 0, | |
969 | CACHE_REPLACEMENT_FIFO = 1, | |
970 | CACHE_REPLACEMENT_RANDOM = 2, | |
971 | CACHE_REPLACEMENT_NR = 3, | |
972 | }; | |
973 | ||
974 | struct bch_sb_field_members { | |
975 | struct bch_sb_field field; | |
976 | struct bch_member members[0]; | |
977 | }; | |
978 | ||
979 | /* BCH_SB_FIELD_crypt: */ | |
980 | ||
981 | struct nonce { | |
982 | __le32 d[4]; | |
983 | }; | |
984 | ||
985 | struct bch_key { | |
986 | __le64 key[4]; | |
987 | }; | |
988 | ||
989 | #define BCH_KEY_MAGIC \ | |
990 | (((u64) 'b' << 0)|((u64) 'c' << 8)| \ | |
991 | ((u64) 'h' << 16)|((u64) '*' << 24)| \ | |
992 | ((u64) '*' << 32)|((u64) 'k' << 40)| \ | |
993 | ((u64) 'e' << 48)|((u64) 'y' << 56)) | |
994 | ||
995 | struct bch_encrypted_key { | |
996 | __le64 magic; | |
997 | struct bch_key key; | |
998 | }; | |
999 | ||
1000 | /* | |
1001 | * If this field is present in the superblock, it stores an encryption key which | |
1002 | * is used encrypt all other data/metadata. The key will normally be encrypted | |
1003 | * with the key userspace provides, but if encryption has been turned off we'll | |
1004 | * just store the master key unencrypted in the superblock so we can access the | |
1005 | * previously encrypted data. | |
1006 | */ | |
1007 | struct bch_sb_field_crypt { | |
1008 | struct bch_sb_field field; | |
1009 | ||
1010 | __le64 flags; | |
1011 | __le64 kdf_flags; | |
1012 | struct bch_encrypted_key key; | |
1013 | }; | |
1014 | ||
1015 | LE64_BITMASK(BCH_CRYPT_KDF_TYPE, struct bch_sb_field_crypt, flags, 0, 4); | |
1016 | ||
1017 | enum bch_kdf_types { | |
1018 | BCH_KDF_SCRYPT = 0, | |
1019 | BCH_KDF_NR = 1, | |
1020 | }; | |
1021 | ||
1022 | /* stored as base 2 log of scrypt params: */ | |
1023 | LE64_BITMASK(BCH_KDF_SCRYPT_N, struct bch_sb_field_crypt, kdf_flags, 0, 16); | |
1024 | LE64_BITMASK(BCH_KDF_SCRYPT_R, struct bch_sb_field_crypt, kdf_flags, 16, 32); | |
1025 | LE64_BITMASK(BCH_KDF_SCRYPT_P, struct bch_sb_field_crypt, kdf_flags, 32, 48); | |
1026 | ||
1027 | /* BCH_SB_FIELD_replicas: */ | |
1028 | ||
1029 | enum bch_data_type { | |
1030 | BCH_DATA_NONE = 0, | |
1031 | BCH_DATA_SB = 1, | |
1032 | BCH_DATA_JOURNAL = 2, | |
1033 | BCH_DATA_BTREE = 3, | |
1034 | BCH_DATA_USER = 4, | |
1035 | BCH_DATA_CACHED = 5, | |
1036 | BCH_DATA_NR = 6, | |
1037 | }; | |
1038 | ||
af9d3bc2 KO |
1039 | struct bch_replicas_entry_v0 { |
1040 | __u8 data_type; | |
1041 | __u8 nr_devs; | |
1042 | __u8 devs[]; | |
1043 | } __attribute__((packed)); | |
1044 | ||
1045 | struct bch_sb_field_replicas_v0 { | |
1046 | struct bch_sb_field field; | |
1047 | struct bch_replicas_entry_v0 entries[]; | |
1048 | } __attribute__((packed, aligned(8))); | |
1049 | ||
1c6fdbd8 | 1050 | struct bch_replicas_entry { |
7a920560 KO |
1051 | __u8 data_type; |
1052 | __u8 nr_devs; | |
af9d3bc2 | 1053 | __u8 nr_required; |
7a920560 | 1054 | __u8 devs[]; |
af9d3bc2 | 1055 | } __attribute__((packed)); |
1c6fdbd8 KO |
1056 | |
1057 | struct bch_sb_field_replicas { | |
1058 | struct bch_sb_field field; | |
1059 | struct bch_replicas_entry entries[]; | |
af9d3bc2 | 1060 | } __attribute__((packed, aligned(8))); |
1c6fdbd8 KO |
1061 | |
1062 | /* BCH_SB_FIELD_quota: */ | |
1063 | ||
1064 | struct bch_sb_quota_counter { | |
1065 | __le32 timelimit; | |
1066 | __le32 warnlimit; | |
1067 | }; | |
1068 | ||
1069 | struct bch_sb_quota_type { | |
1070 | __le64 flags; | |
1071 | struct bch_sb_quota_counter c[Q_COUNTERS]; | |
1072 | }; | |
1073 | ||
1074 | struct bch_sb_field_quota { | |
1075 | struct bch_sb_field field; | |
1076 | struct bch_sb_quota_type q[QTYP_NR]; | |
1077 | } __attribute__((packed, aligned(8))); | |
1078 | ||
1079 | /* BCH_SB_FIELD_disk_groups: */ | |
1080 | ||
1081 | #define BCH_SB_LABEL_SIZE 32 | |
1082 | ||
1083 | struct bch_disk_group { | |
1084 | __u8 label[BCH_SB_LABEL_SIZE]; | |
1085 | __le64 flags[2]; | |
cd575ddf | 1086 | } __attribute__((packed, aligned(8))); |
1c6fdbd8 KO |
1087 | |
1088 | LE64_BITMASK(BCH_GROUP_DELETED, struct bch_disk_group, flags[0], 0, 1) | |
1089 | LE64_BITMASK(BCH_GROUP_DATA_ALLOWED, struct bch_disk_group, flags[0], 1, 6) | |
1090 | LE64_BITMASK(BCH_GROUP_PARENT, struct bch_disk_group, flags[0], 6, 24) | |
1091 | ||
1092 | struct bch_sb_field_disk_groups { | |
1093 | struct bch_sb_field field; | |
1094 | struct bch_disk_group entries[0]; | |
cd575ddf | 1095 | } __attribute__((packed, aligned(8))); |
1c6fdbd8 KO |
1096 | |
1097 | /* | |
1098 | * On clean shutdown, store btree roots and current journal sequence number in | |
1099 | * the superblock: | |
1100 | */ | |
1101 | struct jset_entry { | |
1102 | __le16 u64s; | |
1103 | __u8 btree_id; | |
1104 | __u8 level; | |
1105 | __u8 type; /* designates what this jset holds */ | |
1106 | __u8 pad[3]; | |
1107 | ||
1108 | union { | |
1109 | struct bkey_i start[0]; | |
1110 | __u64 _data[0]; | |
1111 | }; | |
1112 | }; | |
1113 | ||
1114 | struct bch_sb_field_clean { | |
1115 | struct bch_sb_field field; | |
1116 | ||
1117 | __le32 flags; | |
1118 | __le16 read_clock; | |
1119 | __le16 write_clock; | |
1120 | __le64 journal_seq; | |
1121 | ||
1122 | union { | |
1123 | struct jset_entry start[0]; | |
1124 | __u64 _data[0]; | |
1125 | }; | |
1126 | }; | |
1127 | ||
1dd7f9d9 KO |
1128 | struct journal_seq_blacklist_entry { |
1129 | __le64 start; | |
1130 | __le64 end; | |
1131 | }; | |
1132 | ||
1133 | struct bch_sb_field_journal_seq_blacklist { | |
1134 | struct bch_sb_field field; | |
1135 | ||
1136 | union { | |
1137 | struct journal_seq_blacklist_entry start[0]; | |
1138 | __u64 _data[0]; | |
1139 | }; | |
1140 | }; | |
1141 | ||
1c6fdbd8 KO |
1142 | /* Superblock: */ |
1143 | ||
1144 | /* | |
26609b61 KO |
1145 | * New versioning scheme: |
1146 | * One common version number for all on disk data structures - superblock, btree | |
1147 | * nodes, journal entries | |
1c6fdbd8 | 1148 | */ |
26609b61 KO |
1149 | #define BCH_JSET_VERSION_OLD 2 |
1150 | #define BCH_BSET_VERSION_OLD 3 | |
1151 | ||
1152 | enum bcachefs_metadata_version { | |
1153 | bcachefs_metadata_version_min = 9, | |
1154 | bcachefs_metadata_version_new_versioning = 10, | |
1155 | bcachefs_metadata_version_bkey_renumber = 10, | |
1156 | bcachefs_metadata_version_max = 11, | |
1157 | }; | |
1c6fdbd8 | 1158 | |
26609b61 | 1159 | #define bcachefs_metadata_version_current (bcachefs_metadata_version_max - 1) |
1c6fdbd8 KO |
1160 | |
1161 | #define BCH_SB_SECTOR 8 | |
1162 | #define BCH_SB_MEMBERS_MAX 64 /* XXX kill */ | |
1163 | ||
1164 | struct bch_sb_layout { | |
1165 | __uuid_t magic; /* bcachefs superblock UUID */ | |
1166 | __u8 layout_type; | |
1167 | __u8 sb_max_size_bits; /* base 2 of 512 byte sectors */ | |
1168 | __u8 nr_superblocks; | |
1169 | __u8 pad[5]; | |
1170 | __le64 sb_offset[61]; | |
1171 | } __attribute__((packed, aligned(8))); | |
1172 | ||
1173 | #define BCH_SB_LAYOUT_SECTOR 7 | |
1174 | ||
1175 | /* | |
1176 | * @offset - sector where this sb was written | |
1177 | * @version - on disk format version | |
26609b61 KO |
1178 | * @version_min - Oldest metadata version this filesystem contains; so we can |
1179 | * safely drop compatibility code and refuse to mount filesystems | |
1180 | * we'd need it for | |
1c6fdbd8 KO |
1181 | * @magic - identifies as a bcachefs superblock (BCACHE_MAGIC) |
1182 | * @seq - incremented each time superblock is written | |
1183 | * @uuid - used for generating various magic numbers and identifying | |
1184 | * member devices, never changes | |
1185 | * @user_uuid - user visible UUID, may be changed | |
1186 | * @label - filesystem label | |
1187 | * @seq - identifies most recent superblock, incremented each time | |
1188 | * superblock is written | |
1189 | * @features - enabled incompatible features | |
1190 | */ | |
1191 | struct bch_sb { | |
1192 | struct bch_csum csum; | |
1193 | __le16 version; | |
1194 | __le16 version_min; | |
1195 | __le16 pad[2]; | |
1196 | __uuid_t magic; | |
1197 | __uuid_t uuid; | |
1198 | __uuid_t user_uuid; | |
1199 | __u8 label[BCH_SB_LABEL_SIZE]; | |
1200 | __le64 offset; | |
1201 | __le64 seq; | |
1202 | ||
1203 | __le16 block_size; | |
1204 | __u8 dev_idx; | |
1205 | __u8 nr_devices; | |
1206 | __le32 u64s; | |
1207 | ||
1208 | __le64 time_base_lo; | |
1209 | __le32 time_base_hi; | |
1210 | __le32 time_precision; | |
1211 | ||
1212 | __le64 flags[8]; | |
1213 | __le64 features[2]; | |
1214 | __le64 compat[2]; | |
1215 | ||
1216 | struct bch_sb_layout layout; | |
1217 | ||
1218 | union { | |
1219 | struct bch_sb_field start[0]; | |
1220 | __le64 _data[0]; | |
1221 | }; | |
1222 | } __attribute__((packed, aligned(8))); | |
1223 | ||
1224 | /* | |
1225 | * Flags: | |
1226 | * BCH_SB_INITALIZED - set on first mount | |
1227 | * BCH_SB_CLEAN - did we shut down cleanly? Just a hint, doesn't affect | |
1228 | * behaviour of mount/recovery path: | |
1229 | * BCH_SB_INODE_32BIT - limit inode numbers to 32 bits | |
1230 | * BCH_SB_128_BIT_MACS - 128 bit macs instead of 80 | |
1231 | * BCH_SB_ENCRYPTION_TYPE - if nonzero encryption is enabled; overrides | |
1232 | * DATA/META_CSUM_TYPE. Also indicates encryption | |
1233 | * algorithm in use, if/when we get more than one | |
1234 | */ | |
1235 | ||
1236 | LE16_BITMASK(BCH_SB_BLOCK_SIZE, struct bch_sb, block_size, 0, 16); | |
1237 | ||
1238 | LE64_BITMASK(BCH_SB_INITIALIZED, struct bch_sb, flags[0], 0, 1); | |
1239 | LE64_BITMASK(BCH_SB_CLEAN, struct bch_sb, flags[0], 1, 2); | |
1240 | LE64_BITMASK(BCH_SB_CSUM_TYPE, struct bch_sb, flags[0], 2, 8); | |
1241 | LE64_BITMASK(BCH_SB_ERROR_ACTION, struct bch_sb, flags[0], 8, 12); | |
1242 | ||
1243 | LE64_BITMASK(BCH_SB_BTREE_NODE_SIZE, struct bch_sb, flags[0], 12, 28); | |
1244 | ||
1245 | LE64_BITMASK(BCH_SB_GC_RESERVE, struct bch_sb, flags[0], 28, 33); | |
1246 | LE64_BITMASK(BCH_SB_ROOT_RESERVE, struct bch_sb, flags[0], 33, 40); | |
1247 | ||
1248 | LE64_BITMASK(BCH_SB_META_CSUM_TYPE, struct bch_sb, flags[0], 40, 44); | |
1249 | LE64_BITMASK(BCH_SB_DATA_CSUM_TYPE, struct bch_sb, flags[0], 44, 48); | |
1250 | ||
1251 | LE64_BITMASK(BCH_SB_META_REPLICAS_WANT, struct bch_sb, flags[0], 48, 52); | |
1252 | LE64_BITMASK(BCH_SB_DATA_REPLICAS_WANT, struct bch_sb, flags[0], 52, 56); | |
1253 | ||
1254 | LE64_BITMASK(BCH_SB_POSIX_ACL, struct bch_sb, flags[0], 56, 57); | |
1255 | LE64_BITMASK(BCH_SB_USRQUOTA, struct bch_sb, flags[0], 57, 58); | |
1256 | LE64_BITMASK(BCH_SB_GRPQUOTA, struct bch_sb, flags[0], 58, 59); | |
1257 | LE64_BITMASK(BCH_SB_PRJQUOTA, struct bch_sb, flags[0], 59, 60); | |
1258 | ||
0bc166ff KO |
1259 | LE64_BITMASK(BCH_SB_HAS_ERRORS, struct bch_sb, flags[0], 60, 61); |
1260 | ||
1261 | /* 61-64 unused */ | |
1c6fdbd8 KO |
1262 | |
1263 | LE64_BITMASK(BCH_SB_STR_HASH_TYPE, struct bch_sb, flags[1], 0, 4); | |
1264 | LE64_BITMASK(BCH_SB_COMPRESSION_TYPE, struct bch_sb, flags[1], 4, 8); | |
1265 | LE64_BITMASK(BCH_SB_INODE_32BIT, struct bch_sb, flags[1], 8, 9); | |
1266 | ||
1267 | LE64_BITMASK(BCH_SB_128_BIT_MACS, struct bch_sb, flags[1], 9, 10); | |
1268 | LE64_BITMASK(BCH_SB_ENCRYPTION_TYPE, struct bch_sb, flags[1], 10, 14); | |
1269 | ||
1270 | /* | |
1271 | * Max size of an extent that may require bouncing to read or write | |
1272 | * (checksummed, compressed): 64k | |
1273 | */ | |
1274 | LE64_BITMASK(BCH_SB_ENCODED_EXTENT_MAX_BITS, | |
1275 | struct bch_sb, flags[1], 14, 20); | |
1276 | ||
1277 | LE64_BITMASK(BCH_SB_META_REPLICAS_REQ, struct bch_sb, flags[1], 20, 24); | |
1278 | LE64_BITMASK(BCH_SB_DATA_REPLICAS_REQ, struct bch_sb, flags[1], 24, 28); | |
1279 | ||
1280 | LE64_BITMASK(BCH_SB_PROMOTE_TARGET, struct bch_sb, flags[1], 28, 40); | |
1281 | LE64_BITMASK(BCH_SB_FOREGROUND_TARGET, struct bch_sb, flags[1], 40, 52); | |
1282 | LE64_BITMASK(BCH_SB_BACKGROUND_TARGET, struct bch_sb, flags[1], 52, 64); | |
1283 | ||
1284 | LE64_BITMASK(BCH_SB_BACKGROUND_COMPRESSION_TYPE, | |
1285 | struct bch_sb, flags[2], 0, 4); | |
a50ed7c8 | 1286 | LE64_BITMASK(BCH_SB_GC_RESERVE_BYTES, struct bch_sb, flags[2], 4, 64); |
1c6fdbd8 | 1287 | |
cd575ddf KO |
1288 | LE64_BITMASK(BCH_SB_ERASURE_CODE, struct bch_sb, flags[3], 0, 16); |
1289 | ||
1c6fdbd8 KO |
1290 | /* Features: */ |
1291 | enum bch_sb_features { | |
1292 | BCH_FEATURE_LZ4 = 0, | |
1293 | BCH_FEATURE_GZIP = 1, | |
1294 | BCH_FEATURE_ZSTD = 2, | |
c258f28e | 1295 | BCH_FEATURE_ATOMIC_NLINK = 3, /* should have gone under compat */ |
cd575ddf | 1296 | BCH_FEATURE_EC = 4, |
1dd7f9d9 | 1297 | BCH_FEATURE_JOURNAL_SEQ_BLACKLIST_V3 = 5, |
c258f28e | 1298 | BCH_FEATURE_NR, |
1c6fdbd8 KO |
1299 | }; |
1300 | ||
1df42b57 KO |
1301 | enum bch_sb_compat { |
1302 | BCH_COMPAT_FEAT_ALLOC_INFO = 0, | |
1303 | }; | |
1304 | ||
1c6fdbd8 KO |
1305 | /* options: */ |
1306 | ||
1307 | #define BCH_REPLICAS_MAX 4U | |
1308 | ||
1309 | enum bch_error_actions { | |
1310 | BCH_ON_ERROR_CONTINUE = 0, | |
1311 | BCH_ON_ERROR_RO = 1, | |
1312 | BCH_ON_ERROR_PANIC = 2, | |
1313 | BCH_NR_ERROR_ACTIONS = 3, | |
1314 | }; | |
1315 | ||
1316 | enum bch_csum_opts { | |
1317 | BCH_CSUM_OPT_NONE = 0, | |
1318 | BCH_CSUM_OPT_CRC32C = 1, | |
1319 | BCH_CSUM_OPT_CRC64 = 2, | |
1320 | BCH_CSUM_OPT_NR = 3, | |
1321 | }; | |
1322 | ||
1323 | enum bch_str_hash_opts { | |
1324 | BCH_STR_HASH_CRC32C = 0, | |
1325 | BCH_STR_HASH_CRC64 = 1, | |
1326 | BCH_STR_HASH_SIPHASH = 2, | |
1327 | BCH_STR_HASH_NR = 3, | |
1328 | }; | |
1329 | ||
1330 | #define BCH_COMPRESSION_TYPES() \ | |
1331 | x(NONE) \ | |
1332 | x(LZ4) \ | |
1333 | x(GZIP) \ | |
1334 | x(ZSTD) | |
1335 | ||
1336 | enum bch_compression_opts { | |
1337 | #define x(t) BCH_COMPRESSION_OPT_##t, | |
1338 | BCH_COMPRESSION_TYPES() | |
1339 | #undef x | |
1340 | BCH_COMPRESSION_OPT_NR | |
1341 | }; | |
1342 | ||
1343 | /* | |
1344 | * Magic numbers | |
1345 | * | |
1346 | * The various other data structures have their own magic numbers, which are | |
1347 | * xored with the first part of the cache set's UUID | |
1348 | */ | |
1349 | ||
1350 | #define BCACHE_MAGIC \ | |
1351 | UUID_INIT(0xc68573f6, 0x4e1a, 0x45ca, \ | |
1352 | 0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81) | |
1353 | #define BCHFS_MAGIC \ | |
1354 | UUID_INIT(0xc68573f6, 0x66ce, 0x90a9, \ | |
1355 | 0xd9, 0x6a, 0x60, 0xcf, 0x80, 0x3d, 0xf7, 0xef) | |
1356 | ||
1357 | #define BCACHEFS_STATFS_MAGIC 0xca451a4e | |
1358 | ||
1359 | #define JSET_MAGIC __cpu_to_le64(0x245235c1a3625032ULL) | |
1360 | #define BSET_MAGIC __cpu_to_le64(0x90135c78b99e07f5ULL) | |
1361 | ||
1362 | static inline __le64 __bch2_sb_magic(struct bch_sb *sb) | |
1363 | { | |
1364 | __le64 ret; | |
1365 | memcpy(&ret, &sb->uuid, sizeof(ret)); | |
1366 | return ret; | |
1367 | } | |
1368 | ||
1369 | static inline __u64 __jset_magic(struct bch_sb *sb) | |
1370 | { | |
1371 | return __le64_to_cpu(__bch2_sb_magic(sb) ^ JSET_MAGIC); | |
1372 | } | |
1373 | ||
1374 | static inline __u64 __bset_magic(struct bch_sb *sb) | |
1375 | { | |
1376 | return __le64_to_cpu(__bch2_sb_magic(sb) ^ BSET_MAGIC); | |
1377 | } | |
1378 | ||
1379 | /* Journal */ | |
1380 | ||
1c6fdbd8 KO |
1381 | #define JSET_KEYS_U64s (sizeof(struct jset_entry) / sizeof(__u64)) |
1382 | ||
1383 | #define BCH_JSET_ENTRY_TYPES() \ | |
1384 | x(btree_keys, 0) \ | |
1385 | x(btree_root, 1) \ | |
1386 | x(prio_ptrs, 2) \ | |
1387 | x(blacklist, 3) \ | |
2c5af169 | 1388 | x(blacklist_v2, 4) \ |
3577df5f KO |
1389 | x(usage, 5) \ |
1390 | x(data_usage, 6) | |
1c6fdbd8 KO |
1391 | |
1392 | enum { | |
1393 | #define x(f, nr) BCH_JSET_ENTRY_##f = nr, | |
1394 | BCH_JSET_ENTRY_TYPES() | |
1395 | #undef x | |
1396 | BCH_JSET_ENTRY_NR | |
1397 | }; | |
1398 | ||
1399 | /* | |
1400 | * Journal sequence numbers can be blacklisted: bsets record the max sequence | |
1401 | * number of all the journal entries they contain updates for, so that on | |
1402 | * recovery we can ignore those bsets that contain index updates newer that what | |
1403 | * made it into the journal. | |
1404 | * | |
1405 | * This means that we can't reuse that journal_seq - we have to skip it, and | |
1406 | * then record that we skipped it so that the next time we crash and recover we | |
1407 | * don't think there was a missing journal entry. | |
1408 | */ | |
1409 | struct jset_entry_blacklist { | |
1410 | struct jset_entry entry; | |
1411 | __le64 seq; | |
1412 | }; | |
1413 | ||
1414 | struct jset_entry_blacklist_v2 { | |
1415 | struct jset_entry entry; | |
1416 | __le64 start; | |
1417 | __le64 end; | |
1418 | }; | |
1419 | ||
2c5af169 | 1420 | enum { |
3577df5f | 1421 | FS_USAGE_RESERVED = 0, |
2c5af169 KO |
1422 | FS_USAGE_INODES = 1, |
1423 | FS_USAGE_KEY_VERSION = 2, | |
1424 | FS_USAGE_NR = 3 | |
1425 | }; | |
1426 | ||
1427 | struct jset_entry_usage { | |
1428 | struct jset_entry entry; | |
3577df5f KO |
1429 | __le64 v; |
1430 | } __attribute__((packed)); | |
1431 | ||
1432 | struct jset_entry_data_usage { | |
1433 | struct jset_entry entry; | |
1434 | __le64 v; | |
2c5af169 KO |
1435 | struct bch_replicas_entry r; |
1436 | } __attribute__((packed)); | |
1437 | ||
1c6fdbd8 KO |
1438 | /* |
1439 | * On disk format for a journal entry: | |
1440 | * seq is monotonically increasing; every journal entry has its own unique | |
1441 | * sequence number. | |
1442 | * | |
1443 | * last_seq is the oldest journal entry that still has keys the btree hasn't | |
1444 | * flushed to disk yet. | |
1445 | * | |
1446 | * version is for on disk format changes. | |
1447 | */ | |
1448 | struct jset { | |
1449 | struct bch_csum csum; | |
1450 | ||
1451 | __le64 magic; | |
1452 | __le64 seq; | |
1453 | __le32 version; | |
1454 | __le32 flags; | |
1455 | ||
1456 | __le32 u64s; /* size of d[] in u64s */ | |
1457 | ||
1458 | __u8 encrypted_start[0]; | |
1459 | ||
1460 | __le16 read_clock; | |
1461 | __le16 write_clock; | |
1462 | ||
1463 | /* Sequence number of oldest dirty journal entry */ | |
1464 | __le64 last_seq; | |
1465 | ||
1466 | ||
1467 | union { | |
1468 | struct jset_entry start[0]; | |
1469 | __u64 _data[0]; | |
1470 | }; | |
1471 | } __attribute__((packed, aligned(8))); | |
1472 | ||
1473 | LE32_BITMASK(JSET_CSUM_TYPE, struct jset, flags, 0, 4); | |
1474 | LE32_BITMASK(JSET_BIG_ENDIAN, struct jset, flags, 4, 5); | |
1475 | ||
8b335bae | 1476 | #define BCH_JOURNAL_BUCKETS_MIN 8 |
1c6fdbd8 KO |
1477 | |
1478 | /* Btree: */ | |
1479 | ||
26609b61 KO |
1480 | #define BCH_BTREE_IDS() \ |
1481 | x(EXTENTS, 0, "extents") \ | |
1482 | x(INODES, 1, "inodes") \ | |
1483 | x(DIRENTS, 2, "dirents") \ | |
1484 | x(XATTRS, 3, "xattrs") \ | |
1485 | x(ALLOC, 4, "alloc") \ | |
1486 | x(QUOTAS, 5, "quotas") \ | |
1487 | x(EC, 6, "erasure_coding") | |
1c6fdbd8 KO |
1488 | |
1489 | enum btree_id { | |
26609b61 KO |
1490 | #define x(kwd, val, name) BTREE_ID_##kwd = val, |
1491 | BCH_BTREE_IDS() | |
1492 | #undef x | |
1c6fdbd8 KO |
1493 | BTREE_ID_NR |
1494 | }; | |
1495 | ||
1c6fdbd8 KO |
1496 | #define BTREE_MAX_DEPTH 4U |
1497 | ||
1498 | /* Btree nodes */ | |
1499 | ||
1c6fdbd8 KO |
1500 | /* |
1501 | * Btree nodes | |
1502 | * | |
1503 | * On disk a btree node is a list/log of these; within each set the keys are | |
1504 | * sorted | |
1505 | */ | |
1506 | struct bset { | |
1507 | __le64 seq; | |
1508 | ||
1509 | /* | |
1510 | * Highest journal entry this bset contains keys for. | |
1511 | * If on recovery we don't see that journal entry, this bset is ignored: | |
1512 | * this allows us to preserve the order of all index updates after a | |
1513 | * crash, since the journal records a total order of all index updates | |
1514 | * and anything that didn't make it to the journal doesn't get used. | |
1515 | */ | |
1516 | __le64 journal_seq; | |
1517 | ||
1518 | __le32 flags; | |
1519 | __le16 version; | |
1520 | __le16 u64s; /* count of d[] in u64s */ | |
1521 | ||
1522 | union { | |
1523 | struct bkey_packed start[0]; | |
1524 | __u64 _data[0]; | |
1525 | }; | |
1526 | } __attribute__((packed, aligned(8))); | |
1527 | ||
1528 | LE32_BITMASK(BSET_CSUM_TYPE, struct bset, flags, 0, 4); | |
1529 | ||
1530 | LE32_BITMASK(BSET_BIG_ENDIAN, struct bset, flags, 4, 5); | |
1531 | LE32_BITMASK(BSET_SEPARATE_WHITEOUTS, | |
1532 | struct bset, flags, 5, 6); | |
1533 | ||
1534 | struct btree_node { | |
1535 | struct bch_csum csum; | |
1536 | __le64 magic; | |
1537 | ||
1538 | /* this flags field is encrypted, unlike bset->flags: */ | |
1539 | __le64 flags; | |
1540 | ||
1541 | /* Closed interval: */ | |
1542 | struct bpos min_key; | |
1543 | struct bpos max_key; | |
1544 | struct bch_extent_ptr ptr; | |
1545 | struct bkey_format format; | |
1546 | ||
1547 | union { | |
1548 | struct bset keys; | |
1549 | struct { | |
1550 | __u8 pad[22]; | |
1551 | __le16 u64s; | |
1552 | __u64 _data[0]; | |
1553 | ||
1554 | }; | |
1555 | }; | |
1556 | } __attribute__((packed, aligned(8))); | |
1557 | ||
1558 | LE64_BITMASK(BTREE_NODE_ID, struct btree_node, flags, 0, 4); | |
1559 | LE64_BITMASK(BTREE_NODE_LEVEL, struct btree_node, flags, 4, 8); | |
1560 | /* 8-32 unused */ | |
1561 | LE64_BITMASK(BTREE_NODE_SEQ, struct btree_node, flags, 32, 64); | |
1562 | ||
1563 | struct btree_node_entry { | |
1564 | struct bch_csum csum; | |
1565 | ||
1566 | union { | |
1567 | struct bset keys; | |
1568 | struct { | |
1569 | __u8 pad[22]; | |
1570 | __le16 u64s; | |
1571 | __u64 _data[0]; | |
1572 | ||
1573 | }; | |
1574 | }; | |
1575 | } __attribute__((packed, aligned(8))); | |
1576 | ||
1577 | #endif /* _BCACHEFS_FORMAT_H */ |