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1 | /* |
2 | drbd_int.h | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
24 | */ | |
25 | ||
26 | #ifndef _DRBD_INT_H | |
27 | #define _DRBD_INT_H | |
28 | ||
29 | #include <linux/compiler.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/version.h> | |
32 | #include <linux/list.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/bitops.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/crypto.h> | |
37 | #include <linux/tcp.h> | |
38 | #include <linux/mutex.h> | |
39 | #include <linux/major.h> | |
40 | #include <linux/blkdev.h> | |
41 | #include <linux/genhd.h> | |
42 | #include <net/tcp.h> | |
43 | #include <linux/lru_cache.h> | |
44 | ||
45 | #ifdef __CHECKER__ | |
46 | # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr"))) | |
47 | # define __protected_read_by(x) __attribute__((require_context(x,1,999,"read"))) | |
48 | # define __protected_write_by(x) __attribute__((require_context(x,1,999,"write"))) | |
49 | # define __must_hold(x) __attribute__((context(x,1,1), require_context(x,1,999,"call"))) | |
50 | #else | |
51 | # define __protected_by(x) | |
52 | # define __protected_read_by(x) | |
53 | # define __protected_write_by(x) | |
54 | # define __must_hold(x) | |
55 | #endif | |
56 | ||
57 | #define __no_warn(lock, stmt) do { __acquire(lock); stmt; __release(lock); } while (0) | |
58 | ||
59 | /* module parameter, defined in drbd_main.c */ | |
60 | extern unsigned int minor_count; | |
61 | extern int disable_sendpage; | |
62 | extern int allow_oos; | |
63 | extern unsigned int cn_idx; | |
64 | ||
65 | #ifdef CONFIG_DRBD_FAULT_INJECTION | |
66 | extern int enable_faults; | |
67 | extern int fault_rate; | |
68 | extern int fault_devs; | |
69 | #endif | |
70 | ||
71 | extern char usermode_helper[]; | |
72 | ||
73 | ||
74 | #ifndef TRUE | |
75 | #define TRUE 1 | |
76 | #endif | |
77 | #ifndef FALSE | |
78 | #define FALSE 0 | |
79 | #endif | |
80 | ||
81 | /* I don't remember why XCPU ... | |
82 | * This is used to wake the asender, | |
83 | * and to interrupt sending the sending task | |
84 | * on disconnect. | |
85 | */ | |
86 | #define DRBD_SIG SIGXCPU | |
87 | ||
88 | /* This is used to stop/restart our threads. | |
89 | * Cannot use SIGTERM nor SIGKILL, since these | |
90 | * are sent out by init on runlevel changes | |
91 | * I choose SIGHUP for now. | |
92 | */ | |
93 | #define DRBD_SIGKILL SIGHUP | |
94 | ||
95 | /* All EEs on the free list should have ID_VACANT (== 0) | |
96 | * freshly allocated EEs get !ID_VACANT (== 1) | |
97 | * so if it says "cannot dereference null pointer at adress 0x00000001", | |
98 | * it is most likely one of these :( */ | |
99 | ||
100 | #define ID_IN_SYNC (4711ULL) | |
101 | #define ID_OUT_OF_SYNC (4712ULL) | |
102 | ||
103 | #define ID_SYNCER (-1ULL) | |
104 | #define ID_VACANT 0 | |
105 | #define is_syncer_block_id(id) ((id) == ID_SYNCER) | |
106 | ||
107 | struct drbd_conf; | |
108 | ||
109 | ||
110 | /* to shorten dev_warn(DEV, "msg"); and relatives statements */ | |
111 | #define DEV (disk_to_dev(mdev->vdisk)) | |
112 | ||
113 | #define D_ASSERT(exp) if (!(exp)) \ | |
114 | dev_err(DEV, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__) | |
115 | ||
116 | #define ERR_IF(exp) if (({ \ | |
117 | int _b = (exp) != 0; \ | |
118 | if (_b) dev_err(DEV, "%s: (%s) in %s:%d\n", \ | |
119 | __func__, #exp, __FILE__, __LINE__); \ | |
120 | _b; \ | |
121 | })) | |
122 | ||
123 | /* Defines to control fault insertion */ | |
124 | enum { | |
125 | DRBD_FAULT_MD_WR = 0, /* meta data write */ | |
126 | DRBD_FAULT_MD_RD = 1, /* read */ | |
127 | DRBD_FAULT_RS_WR = 2, /* resync */ | |
128 | DRBD_FAULT_RS_RD = 3, | |
129 | DRBD_FAULT_DT_WR = 4, /* data */ | |
130 | DRBD_FAULT_DT_RD = 5, | |
131 | DRBD_FAULT_DT_RA = 6, /* data read ahead */ | |
132 | DRBD_FAULT_BM_ALLOC = 7, /* bitmap allocation */ | |
133 | DRBD_FAULT_AL_EE = 8, /* alloc ee */ | |
134 | ||
135 | DRBD_FAULT_MAX, | |
136 | }; | |
137 | ||
138 | extern void trace_drbd_resync(struct drbd_conf *mdev, int level, const char *fmt, ...); | |
139 | ||
140 | #ifdef CONFIG_DRBD_FAULT_INJECTION | |
141 | extern unsigned int | |
142 | _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type); | |
143 | static inline int | |
144 | drbd_insert_fault(struct drbd_conf *mdev, unsigned int type) { | |
145 | return fault_rate && | |
146 | (enable_faults & (1<<type)) && | |
147 | _drbd_insert_fault(mdev, type); | |
148 | } | |
149 | #define FAULT_ACTIVE(_m, _t) (drbd_insert_fault((_m), (_t))) | |
150 | ||
151 | #else | |
152 | #define FAULT_ACTIVE(_m, _t) (0) | |
153 | #endif | |
154 | ||
155 | /* integer division, round _UP_ to the next integer */ | |
156 | #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0)) | |
157 | /* usual integer division */ | |
158 | #define div_floor(A, B) ((A)/(B)) | |
159 | ||
160 | /* drbd_meta-data.c (still in drbd_main.c) */ | |
161 | /* 4th incarnation of the disk layout. */ | |
162 | #define DRBD_MD_MAGIC (DRBD_MAGIC+4) | |
163 | ||
164 | extern struct drbd_conf **minor_table; | |
165 | extern struct ratelimit_state drbd_ratelimit_state; | |
166 | ||
167 | /* on the wire */ | |
168 | enum drbd_packets { | |
169 | /* receiver (data socket) */ | |
170 | P_DATA = 0x00, | |
171 | P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */ | |
172 | P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */ | |
173 | P_BARRIER = 0x03, | |
174 | P_BITMAP = 0x04, | |
175 | P_BECOME_SYNC_TARGET = 0x05, | |
176 | P_BECOME_SYNC_SOURCE = 0x06, | |
177 | P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */ | |
178 | P_DATA_REQUEST = 0x08, /* Used to ask for a data block */ | |
179 | P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */ | |
180 | P_SYNC_PARAM = 0x0a, | |
181 | P_PROTOCOL = 0x0b, | |
182 | P_UUIDS = 0x0c, | |
183 | P_SIZES = 0x0d, | |
184 | P_STATE = 0x0e, | |
185 | P_SYNC_UUID = 0x0f, | |
186 | P_AUTH_CHALLENGE = 0x10, | |
187 | P_AUTH_RESPONSE = 0x11, | |
188 | P_STATE_CHG_REQ = 0x12, | |
189 | ||
190 | /* asender (meta socket */ | |
191 | P_PING = 0x13, | |
192 | P_PING_ACK = 0x14, | |
193 | P_RECV_ACK = 0x15, /* Used in protocol B */ | |
194 | P_WRITE_ACK = 0x16, /* Used in protocol C */ | |
195 | P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */ | |
196 | P_DISCARD_ACK = 0x18, /* Used in proto C, two-primaries conflict detection */ | |
197 | P_NEG_ACK = 0x19, /* Sent if local disk is unusable */ | |
198 | P_NEG_DREPLY = 0x1a, /* Local disk is broken... */ | |
199 | P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */ | |
200 | P_BARRIER_ACK = 0x1c, | |
201 | P_STATE_CHG_REPLY = 0x1d, | |
202 | ||
203 | /* "new" commands, no longer fitting into the ordering scheme above */ | |
204 | ||
205 | P_OV_REQUEST = 0x1e, /* data socket */ | |
206 | P_OV_REPLY = 0x1f, | |
207 | P_OV_RESULT = 0x20, /* meta socket */ | |
208 | P_CSUM_RS_REQUEST = 0x21, /* data socket */ | |
209 | P_RS_IS_IN_SYNC = 0x22, /* meta socket */ | |
210 | P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */ | |
211 | P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */ | |
212 | ||
213 | P_MAX_CMD = 0x25, | |
214 | P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */ | |
215 | P_MAX_OPT_CMD = 0x101, | |
216 | ||
217 | /* special command ids for handshake */ | |
218 | ||
219 | P_HAND_SHAKE_M = 0xfff1, /* First Packet on the MetaSock */ | |
220 | P_HAND_SHAKE_S = 0xfff2, /* First Packet on the Socket */ | |
221 | ||
222 | P_HAND_SHAKE = 0xfffe /* FIXED for the next century! */ | |
223 | }; | |
224 | ||
225 | static inline const char *cmdname(enum drbd_packets cmd) | |
226 | { | |
227 | /* THINK may need to become several global tables | |
228 | * when we want to support more than | |
229 | * one PRO_VERSION */ | |
230 | static const char *cmdnames[] = { | |
231 | [P_DATA] = "Data", | |
232 | [P_DATA_REPLY] = "DataReply", | |
233 | [P_RS_DATA_REPLY] = "RSDataReply", | |
234 | [P_BARRIER] = "Barrier", | |
235 | [P_BITMAP] = "ReportBitMap", | |
236 | [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget", | |
237 | [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource", | |
238 | [P_UNPLUG_REMOTE] = "UnplugRemote", | |
239 | [P_DATA_REQUEST] = "DataRequest", | |
240 | [P_RS_DATA_REQUEST] = "RSDataRequest", | |
241 | [P_SYNC_PARAM] = "SyncParam", | |
242 | [P_SYNC_PARAM89] = "SyncParam89", | |
243 | [P_PROTOCOL] = "ReportProtocol", | |
244 | [P_UUIDS] = "ReportUUIDs", | |
245 | [P_SIZES] = "ReportSizes", | |
246 | [P_STATE] = "ReportState", | |
247 | [P_SYNC_UUID] = "ReportSyncUUID", | |
248 | [P_AUTH_CHALLENGE] = "AuthChallenge", | |
249 | [P_AUTH_RESPONSE] = "AuthResponse", | |
250 | [P_PING] = "Ping", | |
251 | [P_PING_ACK] = "PingAck", | |
252 | [P_RECV_ACK] = "RecvAck", | |
253 | [P_WRITE_ACK] = "WriteAck", | |
254 | [P_RS_WRITE_ACK] = "RSWriteAck", | |
255 | [P_DISCARD_ACK] = "DiscardAck", | |
256 | [P_NEG_ACK] = "NegAck", | |
257 | [P_NEG_DREPLY] = "NegDReply", | |
258 | [P_NEG_RS_DREPLY] = "NegRSDReply", | |
259 | [P_BARRIER_ACK] = "BarrierAck", | |
260 | [P_STATE_CHG_REQ] = "StateChgRequest", | |
261 | [P_STATE_CHG_REPLY] = "StateChgReply", | |
262 | [P_OV_REQUEST] = "OVRequest", | |
263 | [P_OV_REPLY] = "OVReply", | |
264 | [P_OV_RESULT] = "OVResult", | |
265 | [P_MAX_CMD] = NULL, | |
266 | }; | |
267 | ||
268 | if (cmd == P_HAND_SHAKE_M) | |
269 | return "HandShakeM"; | |
270 | if (cmd == P_HAND_SHAKE_S) | |
271 | return "HandShakeS"; | |
272 | if (cmd == P_HAND_SHAKE) | |
273 | return "HandShake"; | |
274 | if (cmd >= P_MAX_CMD) | |
275 | return "Unknown"; | |
276 | return cmdnames[cmd]; | |
277 | } | |
278 | ||
279 | /* for sending/receiving the bitmap, | |
280 | * possibly in some encoding scheme */ | |
281 | struct bm_xfer_ctx { | |
282 | /* "const" | |
283 | * stores total bits and long words | |
284 | * of the bitmap, so we don't need to | |
285 | * call the accessor functions over and again. */ | |
286 | unsigned long bm_bits; | |
287 | unsigned long bm_words; | |
288 | /* during xfer, current position within the bitmap */ | |
289 | unsigned long bit_offset; | |
290 | unsigned long word_offset; | |
291 | ||
292 | /* statistics; index: (h->command == P_BITMAP) */ | |
293 | unsigned packets[2]; | |
294 | unsigned bytes[2]; | |
295 | }; | |
296 | ||
297 | extern void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
298 | const char *direction, struct bm_xfer_ctx *c); | |
299 | ||
300 | static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) | |
301 | { | |
302 | /* word_offset counts "native long words" (32 or 64 bit), | |
303 | * aligned at 64 bit. | |
304 | * Encoded packet may end at an unaligned bit offset. | |
305 | * In case a fallback clear text packet is transmitted in | |
306 | * between, we adjust this offset back to the last 64bit | |
307 | * aligned "native long word", which makes coding and decoding | |
308 | * the plain text bitmap much more convenient. */ | |
309 | #if BITS_PER_LONG == 64 | |
310 | c->word_offset = c->bit_offset >> 6; | |
311 | #elif BITS_PER_LONG == 32 | |
312 | c->word_offset = c->bit_offset >> 5; | |
313 | c->word_offset &= ~(1UL); | |
314 | #else | |
315 | # error "unsupported BITS_PER_LONG" | |
316 | #endif | |
317 | } | |
318 | ||
319 | #ifndef __packed | |
320 | #define __packed __attribute__((packed)) | |
321 | #endif | |
322 | ||
323 | /* This is the layout for a packet on the wire. | |
324 | * The byteorder is the network byte order. | |
325 | * (except block_id and barrier fields. | |
326 | * these are pointers to local structs | |
327 | * and have no relevance for the partner, | |
328 | * which just echoes them as received.) | |
329 | * | |
330 | * NOTE that the payload starts at a long aligned offset, | |
331 | * regardless of 32 or 64 bit arch! | |
332 | */ | |
333 | struct p_header { | |
334 | u32 magic; | |
335 | u16 command; | |
336 | u16 length; /* bytes of data after this header */ | |
337 | u8 payload[0]; | |
338 | } __packed; | |
339 | /* 8 bytes. packet FIXED for the next century! */ | |
340 | ||
341 | /* | |
342 | * short commands, packets without payload, plain p_header: | |
343 | * P_PING | |
344 | * P_PING_ACK | |
345 | * P_BECOME_SYNC_TARGET | |
346 | * P_BECOME_SYNC_SOURCE | |
347 | * P_UNPLUG_REMOTE | |
348 | */ | |
349 | ||
350 | /* | |
351 | * commands with out-of-struct payload: | |
352 | * P_BITMAP (no additional fields) | |
353 | * P_DATA, P_DATA_REPLY (see p_data) | |
354 | * P_COMPRESSED_BITMAP (see receive_compressed_bitmap) | |
355 | */ | |
356 | ||
357 | /* these defines must not be changed without changing the protocol version */ | |
358 | #define DP_HARDBARRIER 1 | |
359 | #define DP_RW_SYNC 2 | |
360 | #define DP_MAY_SET_IN_SYNC 4 | |
361 | ||
362 | struct p_data { | |
363 | struct p_header head; | |
364 | u64 sector; /* 64 bits sector number */ | |
365 | u64 block_id; /* to identify the request in protocol B&C */ | |
366 | u32 seq_num; | |
367 | u32 dp_flags; | |
368 | } __packed; | |
369 | ||
370 | /* | |
371 | * commands which share a struct: | |
372 | * p_block_ack: | |
373 | * P_RECV_ACK (proto B), P_WRITE_ACK (proto C), | |
374 | * P_DISCARD_ACK (proto C, two-primaries conflict detection) | |
375 | * p_block_req: | |
376 | * P_DATA_REQUEST, P_RS_DATA_REQUEST | |
377 | */ | |
378 | struct p_block_ack { | |
379 | struct p_header head; | |
380 | u64 sector; | |
381 | u64 block_id; | |
382 | u32 blksize; | |
383 | u32 seq_num; | |
384 | } __packed; | |
385 | ||
386 | ||
387 | struct p_block_req { | |
388 | struct p_header head; | |
389 | u64 sector; | |
390 | u64 block_id; | |
391 | u32 blksize; | |
392 | u32 pad; /* to multiple of 8 Byte */ | |
393 | } __packed; | |
394 | ||
395 | /* | |
396 | * commands with their own struct for additional fields: | |
397 | * P_HAND_SHAKE | |
398 | * P_BARRIER | |
399 | * P_BARRIER_ACK | |
400 | * P_SYNC_PARAM | |
401 | * ReportParams | |
402 | */ | |
403 | ||
404 | struct p_handshake { | |
405 | struct p_header head; /* 8 bytes */ | |
406 | u32 protocol_min; | |
407 | u32 feature_flags; | |
408 | u32 protocol_max; | |
409 | ||
410 | /* should be more than enough for future enhancements | |
411 | * for now, feature_flags and the reserverd array shall be zero. | |
412 | */ | |
413 | ||
414 | u32 _pad; | |
415 | u64 reserverd[7]; | |
416 | } __packed; | |
417 | /* 80 bytes, FIXED for the next century */ | |
418 | ||
419 | struct p_barrier { | |
420 | struct p_header head; | |
421 | u32 barrier; /* barrier number _handle_ only */ | |
422 | u32 pad; /* to multiple of 8 Byte */ | |
423 | } __packed; | |
424 | ||
425 | struct p_barrier_ack { | |
426 | struct p_header head; | |
427 | u32 barrier; | |
428 | u32 set_size; | |
429 | } __packed; | |
430 | ||
431 | struct p_rs_param { | |
432 | struct p_header head; | |
433 | u32 rate; | |
434 | ||
435 | /* Since protocol version 88 and higher. */ | |
436 | char verify_alg[0]; | |
437 | } __packed; | |
438 | ||
439 | struct p_rs_param_89 { | |
440 | struct p_header head; | |
441 | u32 rate; | |
442 | /* protocol version 89: */ | |
443 | char verify_alg[SHARED_SECRET_MAX]; | |
444 | char csums_alg[SHARED_SECRET_MAX]; | |
445 | } __packed; | |
446 | ||
447 | struct p_protocol { | |
448 | struct p_header head; | |
449 | u32 protocol; | |
450 | u32 after_sb_0p; | |
451 | u32 after_sb_1p; | |
452 | u32 after_sb_2p; | |
453 | u32 want_lose; | |
454 | u32 two_primaries; | |
455 | ||
456 | /* Since protocol version 87 and higher. */ | |
457 | char integrity_alg[0]; | |
458 | ||
459 | } __packed; | |
460 | ||
461 | struct p_uuids { | |
462 | struct p_header head; | |
463 | u64 uuid[UI_EXTENDED_SIZE]; | |
464 | } __packed; | |
465 | ||
466 | struct p_rs_uuid { | |
467 | struct p_header head; | |
468 | u64 uuid; | |
469 | } __packed; | |
470 | ||
471 | struct p_sizes { | |
472 | struct p_header head; | |
473 | u64 d_size; /* size of disk */ | |
474 | u64 u_size; /* user requested size */ | |
475 | u64 c_size; /* current exported size */ | |
476 | u32 max_segment_size; /* Maximal size of a BIO */ | |
477 | u32 queue_order_type; | |
478 | } __packed; | |
479 | ||
480 | struct p_state { | |
481 | struct p_header head; | |
482 | u32 state; | |
483 | } __packed; | |
484 | ||
485 | struct p_req_state { | |
486 | struct p_header head; | |
487 | u32 mask; | |
488 | u32 val; | |
489 | } __packed; | |
490 | ||
491 | struct p_req_state_reply { | |
492 | struct p_header head; | |
493 | u32 retcode; | |
494 | } __packed; | |
495 | ||
496 | struct p_drbd06_param { | |
497 | u64 size; | |
498 | u32 state; | |
499 | u32 blksize; | |
500 | u32 protocol; | |
501 | u32 version; | |
502 | u32 gen_cnt[5]; | |
503 | u32 bit_map_gen[5]; | |
504 | } __packed; | |
505 | ||
506 | struct p_discard { | |
507 | struct p_header head; | |
508 | u64 block_id; | |
509 | u32 seq_num; | |
510 | u32 pad; | |
511 | } __packed; | |
512 | ||
513 | /* Valid values for the encoding field. | |
514 | * Bump proto version when changing this. */ | |
515 | enum drbd_bitmap_code { | |
516 | /* RLE_VLI_Bytes = 0, | |
517 | * and other bit variants had been defined during | |
518 | * algorithm evaluation. */ | |
519 | RLE_VLI_Bits = 2, | |
520 | }; | |
521 | ||
522 | struct p_compressed_bm { | |
523 | struct p_header head; | |
524 | /* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code | |
525 | * (encoding & 0x80): polarity (set/unset) of first runlength | |
526 | * ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits | |
527 | * used to pad up to head.length bytes | |
528 | */ | |
529 | u8 encoding; | |
530 | ||
531 | u8 code[0]; | |
532 | } __packed; | |
533 | ||
534 | /* DCBP: Drbd Compressed Bitmap Packet ... */ | |
535 | static inline enum drbd_bitmap_code | |
536 | DCBP_get_code(struct p_compressed_bm *p) | |
537 | { | |
538 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
539 | } | |
540 | ||
541 | static inline void | |
542 | DCBP_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) | |
543 | { | |
544 | BUG_ON(code & ~0xf); | |
545 | p->encoding = (p->encoding & ~0xf) | code; | |
546 | } | |
547 | ||
548 | static inline int | |
549 | DCBP_get_start(struct p_compressed_bm *p) | |
550 | { | |
551 | return (p->encoding & 0x80) != 0; | |
552 | } | |
553 | ||
554 | static inline void | |
555 | DCBP_set_start(struct p_compressed_bm *p, int set) | |
556 | { | |
557 | p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); | |
558 | } | |
559 | ||
560 | static inline int | |
561 | DCBP_get_pad_bits(struct p_compressed_bm *p) | |
562 | { | |
563 | return (p->encoding >> 4) & 0x7; | |
564 | } | |
565 | ||
566 | static inline void | |
567 | DCBP_set_pad_bits(struct p_compressed_bm *p, int n) | |
568 | { | |
569 | BUG_ON(n & ~0x7); | |
570 | p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); | |
571 | } | |
572 | ||
573 | /* one bitmap packet, including the p_header, | |
574 | * should fit within one _architecture independend_ page. | |
575 | * so we need to use the fixed size 4KiB page size | |
576 | * most architechtures have used for a long time. | |
577 | */ | |
578 | #define BM_PACKET_PAYLOAD_BYTES (4096 - sizeof(struct p_header)) | |
579 | #define BM_PACKET_WORDS (BM_PACKET_PAYLOAD_BYTES/sizeof(long)) | |
580 | #define BM_PACKET_VLI_BYTES_MAX (4096 - sizeof(struct p_compressed_bm)) | |
581 | #if (PAGE_SIZE < 4096) | |
582 | /* drbd_send_bitmap / receive_bitmap would break horribly */ | |
583 | #error "PAGE_SIZE too small" | |
584 | #endif | |
585 | ||
586 | union p_polymorph { | |
587 | struct p_header header; | |
588 | struct p_handshake handshake; | |
589 | struct p_data data; | |
590 | struct p_block_ack block_ack; | |
591 | struct p_barrier barrier; | |
592 | struct p_barrier_ack barrier_ack; | |
593 | struct p_rs_param_89 rs_param_89; | |
594 | struct p_protocol protocol; | |
595 | struct p_sizes sizes; | |
596 | struct p_uuids uuids; | |
597 | struct p_state state; | |
598 | struct p_req_state req_state; | |
599 | struct p_req_state_reply req_state_reply; | |
600 | struct p_block_req block_req; | |
601 | } __packed; | |
602 | ||
603 | /**********************************************************************/ | |
604 | enum drbd_thread_state { | |
605 | None, | |
606 | Running, | |
607 | Exiting, | |
608 | Restarting | |
609 | }; | |
610 | ||
611 | struct drbd_thread { | |
612 | spinlock_t t_lock; | |
613 | struct task_struct *task; | |
614 | struct completion stop; | |
615 | enum drbd_thread_state t_state; | |
616 | int (*function) (struct drbd_thread *); | |
617 | struct drbd_conf *mdev; | |
618 | int reset_cpu_mask; | |
619 | }; | |
620 | ||
621 | static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) | |
622 | { | |
623 | /* THINK testing the t_state seems to be uncritical in all cases | |
624 | * (but thread_{start,stop}), so we can read it *without* the lock. | |
625 | * --lge */ | |
626 | ||
627 | smp_rmb(); | |
628 | return thi->t_state; | |
629 | } | |
630 | ||
631 | ||
632 | /* | |
633 | * Having this as the first member of a struct provides sort of "inheritance". | |
634 | * "derived" structs can be "drbd_queue_work()"ed. | |
635 | * The callback should know and cast back to the descendant struct. | |
636 | * drbd_request and drbd_epoch_entry are descendants of drbd_work. | |
637 | */ | |
638 | struct drbd_work; | |
639 | typedef int (*drbd_work_cb)(struct drbd_conf *, struct drbd_work *, int cancel); | |
640 | struct drbd_work { | |
641 | struct list_head list; | |
642 | drbd_work_cb cb; | |
643 | }; | |
644 | ||
645 | struct drbd_tl_epoch; | |
646 | struct drbd_request { | |
647 | struct drbd_work w; | |
648 | struct drbd_conf *mdev; | |
649 | ||
650 | /* if local IO is not allowed, will be NULL. | |
651 | * if local IO _is_ allowed, holds the locally submitted bio clone, | |
652 | * or, after local IO completion, the ERR_PTR(error). | |
653 | * see drbd_endio_pri(). */ | |
654 | struct bio *private_bio; | |
655 | ||
656 | struct hlist_node colision; | |
657 | sector_t sector; | |
658 | unsigned int size; | |
659 | unsigned int epoch; /* barrier_nr */ | |
660 | ||
661 | /* barrier_nr: used to check on "completion" whether this req was in | |
662 | * the current epoch, and we therefore have to close it, | |
663 | * starting a new epoch... | |
664 | */ | |
665 | ||
666 | /* up to here, the struct layout is identical to drbd_epoch_entry; | |
667 | * we might be able to use that to our advantage... */ | |
668 | ||
669 | struct list_head tl_requests; /* ring list in the transfer log */ | |
670 | struct bio *master_bio; /* master bio pointer */ | |
671 | unsigned long rq_state; /* see comments above _req_mod() */ | |
672 | int seq_num; | |
673 | unsigned long start_time; | |
674 | }; | |
675 | ||
676 | struct drbd_tl_epoch { | |
677 | struct drbd_work w; | |
678 | struct list_head requests; /* requests before */ | |
679 | struct drbd_tl_epoch *next; /* pointer to the next barrier */ | |
680 | unsigned int br_number; /* the barriers identifier. */ | |
681 | int n_req; /* number of requests attached before this barrier */ | |
682 | }; | |
683 | ||
684 | struct drbd_request; | |
685 | ||
686 | /* These Tl_epoch_entries may be in one of 6 lists: | |
687 | active_ee .. data packet being written | |
688 | sync_ee .. syncer block being written | |
689 | done_ee .. block written, need to send P_WRITE_ACK | |
690 | read_ee .. [RS]P_DATA_REQUEST being read | |
691 | */ | |
692 | ||
693 | struct drbd_epoch { | |
694 | struct list_head list; | |
695 | unsigned int barrier_nr; | |
696 | atomic_t epoch_size; /* increased on every request added. */ | |
697 | atomic_t active; /* increased on every req. added, and dec on every finished. */ | |
698 | unsigned long flags; | |
699 | }; | |
700 | ||
701 | /* drbd_epoch flag bits */ | |
702 | enum { | |
703 | DE_BARRIER_IN_NEXT_EPOCH_ISSUED, | |
704 | DE_BARRIER_IN_NEXT_EPOCH_DONE, | |
705 | DE_CONTAINS_A_BARRIER, | |
706 | DE_HAVE_BARRIER_NUMBER, | |
707 | DE_IS_FINISHING, | |
708 | }; | |
709 | ||
710 | enum epoch_event { | |
711 | EV_PUT, | |
712 | EV_GOT_BARRIER_NR, | |
713 | EV_BARRIER_DONE, | |
714 | EV_BECAME_LAST, | |
715 | EV_TRACE_FLUSH, /* TRACE_ are not real events, only used for tracing */ | |
716 | EV_TRACE_ADD_BARRIER, /* Doing the first write as a barrier write */ | |
717 | EV_TRACE_SETTING_BI, /* Barrier is expressed with the first write of the next epoch */ | |
718 | EV_TRACE_ALLOC, | |
719 | EV_TRACE_FREE, | |
720 | EV_CLEANUP = 32, /* used as flag */ | |
721 | }; | |
722 | ||
723 | struct drbd_epoch_entry { | |
724 | struct drbd_work w; | |
725 | struct drbd_conf *mdev; | |
726 | struct bio *private_bio; | |
727 | struct hlist_node colision; | |
728 | sector_t sector; | |
729 | unsigned int size; | |
730 | struct drbd_epoch *epoch; | |
731 | ||
732 | /* up to here, the struct layout is identical to drbd_request; | |
733 | * we might be able to use that to our advantage... */ | |
734 | ||
735 | unsigned int flags; | |
736 | u64 block_id; | |
737 | }; | |
738 | ||
739 | struct drbd_wq_barrier { | |
740 | struct drbd_work w; | |
741 | struct completion done; | |
742 | }; | |
743 | ||
744 | struct digest_info { | |
745 | int digest_size; | |
746 | void *digest; | |
747 | }; | |
748 | ||
749 | /* ee flag bits */ | |
750 | enum { | |
751 | __EE_CALL_AL_COMPLETE_IO, | |
752 | __EE_CONFLICT_PENDING, | |
753 | __EE_MAY_SET_IN_SYNC, | |
754 | __EE_IS_BARRIER, | |
755 | }; | |
756 | #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO) | |
757 | #define EE_CONFLICT_PENDING (1<<__EE_CONFLICT_PENDING) | |
758 | #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC) | |
759 | #define EE_IS_BARRIER (1<<__EE_IS_BARRIER) | |
760 | ||
761 | /* global flag bits */ | |
762 | enum { | |
763 | CREATE_BARRIER, /* next P_DATA is preceeded by a P_BARRIER */ | |
764 | SIGNAL_ASENDER, /* whether asender wants to be interrupted */ | |
765 | SEND_PING, /* whether asender should send a ping asap */ | |
766 | ||
767 | STOP_SYNC_TIMER, /* tell timer to cancel itself */ | |
768 | UNPLUG_QUEUED, /* only relevant with kernel 2.4 */ | |
769 | UNPLUG_REMOTE, /* sending a "UnplugRemote" could help */ | |
770 | MD_DIRTY, /* current uuids and flags not yet on disk */ | |
771 | DISCARD_CONCURRENT, /* Set on one node, cleared on the peer! */ | |
772 | USE_DEGR_WFC_T, /* degr-wfc-timeout instead of wfc-timeout. */ | |
773 | CLUSTER_ST_CHANGE, /* Cluster wide state change going on... */ | |
774 | CL_ST_CHG_SUCCESS, | |
775 | CL_ST_CHG_FAIL, | |
776 | CRASHED_PRIMARY, /* This node was a crashed primary. | |
777 | * Gets cleared when the state.conn | |
778 | * goes into C_CONNECTED state. */ | |
779 | WRITE_BM_AFTER_RESYNC, /* A kmalloc() during resync failed */ | |
780 | NO_BARRIER_SUPP, /* underlying block device doesn't implement barriers */ | |
781 | CONSIDER_RESYNC, | |
782 | ||
783 | MD_NO_BARRIER, /* meta data device does not support barriers, | |
784 | so don't even try */ | |
785 | SUSPEND_IO, /* suspend application io */ | |
786 | BITMAP_IO, /* suspend application io; | |
787 | once no more io in flight, start bitmap io */ | |
788 | BITMAP_IO_QUEUED, /* Started bitmap IO */ | |
789 | RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */ | |
790 | NET_CONGESTED, /* The data socket is congested */ | |
791 | ||
792 | CONFIG_PENDING, /* serialization of (re)configuration requests. | |
793 | * if set, also prevents the device from dying */ | |
794 | DEVICE_DYING, /* device became unconfigured, | |
795 | * but worker thread is still handling the cleanup. | |
796 | * reconfiguring (nl_disk_conf, nl_net_conf) is dissalowed, | |
797 | * while this is set. */ | |
798 | RESIZE_PENDING, /* Size change detected locally, waiting for the response from | |
799 | * the peer, if it changed there as well. */ | |
800 | }; | |
801 | ||
802 | struct drbd_bitmap; /* opaque for drbd_conf */ | |
803 | ||
804 | /* TODO sort members for performance | |
805 | * MAYBE group them further */ | |
806 | ||
807 | /* THINK maybe we actually want to use the default "event/%s" worker threads | |
808 | * or similar in linux 2.6, which uses per cpu data and threads. | |
809 | * | |
810 | * To be general, this might need a spin_lock member. | |
811 | * For now, please use the mdev->req_lock to protect list_head, | |
812 | * see drbd_queue_work below. | |
813 | */ | |
814 | struct drbd_work_queue { | |
815 | struct list_head q; | |
816 | struct semaphore s; /* producers up it, worker down()s it */ | |
817 | spinlock_t q_lock; /* to protect the list. */ | |
818 | }; | |
819 | ||
820 | struct drbd_socket { | |
821 | struct drbd_work_queue work; | |
822 | struct mutex mutex; | |
823 | struct socket *socket; | |
824 | /* this way we get our | |
825 | * send/receive buffers off the stack */ | |
826 | union p_polymorph sbuf; | |
827 | union p_polymorph rbuf; | |
828 | }; | |
829 | ||
830 | struct drbd_md { | |
831 | u64 md_offset; /* sector offset to 'super' block */ | |
832 | ||
833 | u64 la_size_sect; /* last agreed size, unit sectors */ | |
834 | u64 uuid[UI_SIZE]; | |
835 | u64 device_uuid; | |
836 | u32 flags; | |
837 | u32 md_size_sect; | |
838 | ||
839 | s32 al_offset; /* signed relative sector offset to al area */ | |
840 | s32 bm_offset; /* signed relative sector offset to bitmap */ | |
841 | ||
842 | /* u32 al_nr_extents; important for restoring the AL | |
843 | * is stored into sync_conf.al_extents, which in turn | |
844 | * gets applied to act_log->nr_elements | |
845 | */ | |
846 | }; | |
847 | ||
848 | /* for sync_conf and other types... */ | |
849 | #define NL_PACKET(name, number, fields) struct name { fields }; | |
850 | #define NL_INTEGER(pn,pr,member) int member; | |
851 | #define NL_INT64(pn,pr,member) __u64 member; | |
852 | #define NL_BIT(pn,pr,member) unsigned member:1; | |
853 | #define NL_STRING(pn,pr,member,len) unsigned char member[len]; int member ## _len; | |
854 | #include "linux/drbd_nl.h" | |
855 | ||
856 | struct drbd_backing_dev { | |
857 | struct block_device *backing_bdev; | |
858 | struct block_device *md_bdev; | |
859 | struct file *lo_file; | |
860 | struct file *md_file; | |
861 | struct drbd_md md; | |
862 | struct disk_conf dc; /* The user provided config... */ | |
863 | sector_t known_size; /* last known size of that backing device */ | |
864 | }; | |
865 | ||
866 | struct drbd_md_io { | |
867 | struct drbd_conf *mdev; | |
868 | struct completion event; | |
869 | int error; | |
870 | }; | |
871 | ||
872 | struct bm_io_work { | |
873 | struct drbd_work w; | |
874 | char *why; | |
875 | int (*io_fn)(struct drbd_conf *mdev); | |
876 | void (*done)(struct drbd_conf *mdev, int rv); | |
877 | }; | |
878 | ||
879 | enum write_ordering_e { | |
880 | WO_none, | |
881 | WO_drain_io, | |
882 | WO_bdev_flush, | |
883 | WO_bio_barrier | |
884 | }; | |
885 | ||
886 | struct drbd_conf { | |
887 | /* things that are stored as / read from meta data on disk */ | |
888 | unsigned long flags; | |
889 | ||
890 | /* configured by drbdsetup */ | |
891 | struct net_conf *net_conf; /* protected by get_net_conf() and put_net_conf() */ | |
892 | struct syncer_conf sync_conf; | |
893 | struct drbd_backing_dev *ldev __protected_by(local); | |
894 | ||
895 | sector_t p_size; /* partner's disk size */ | |
896 | struct request_queue *rq_queue; | |
897 | struct block_device *this_bdev; | |
898 | struct gendisk *vdisk; | |
899 | ||
900 | struct drbd_socket data; /* data/barrier/cstate/parameter packets */ | |
901 | struct drbd_socket meta; /* ping/ack (metadata) packets */ | |
902 | int agreed_pro_version; /* actually used protocol version */ | |
903 | unsigned long last_received; /* in jiffies, either socket */ | |
904 | unsigned int ko_count; | |
905 | struct drbd_work resync_work, | |
906 | unplug_work, | |
907 | md_sync_work; | |
908 | struct timer_list resync_timer; | |
909 | struct timer_list md_sync_timer; | |
910 | ||
911 | /* Used after attach while negotiating new disk state. */ | |
912 | union drbd_state new_state_tmp; | |
913 | ||
914 | union drbd_state state; | |
915 | wait_queue_head_t misc_wait; | |
916 | wait_queue_head_t state_wait; /* upon each state change. */ | |
917 | unsigned int send_cnt; | |
918 | unsigned int recv_cnt; | |
919 | unsigned int read_cnt; | |
920 | unsigned int writ_cnt; | |
921 | unsigned int al_writ_cnt; | |
922 | unsigned int bm_writ_cnt; | |
923 | atomic_t ap_bio_cnt; /* Requests we need to complete */ | |
924 | atomic_t ap_pending_cnt; /* AP data packets on the wire, ack expected */ | |
925 | atomic_t rs_pending_cnt; /* RS request/data packets on the wire */ | |
926 | atomic_t unacked_cnt; /* Need to send replys for */ | |
927 | atomic_t local_cnt; /* Waiting for local completion */ | |
928 | atomic_t net_cnt; /* Users of net_conf */ | |
929 | spinlock_t req_lock; | |
930 | struct drbd_tl_epoch *unused_spare_tle; /* for pre-allocation */ | |
931 | struct drbd_tl_epoch *newest_tle; | |
932 | struct drbd_tl_epoch *oldest_tle; | |
933 | struct list_head out_of_sequence_requests; | |
934 | struct hlist_head *tl_hash; | |
935 | unsigned int tl_hash_s; | |
936 | ||
937 | /* blocks to sync in this run [unit BM_BLOCK_SIZE] */ | |
938 | unsigned long rs_total; | |
939 | /* number of sync IOs that failed in this run */ | |
940 | unsigned long rs_failed; | |
941 | /* Syncer's start time [unit jiffies] */ | |
942 | unsigned long rs_start; | |
943 | /* cumulated time in PausedSyncX state [unit jiffies] */ | |
944 | unsigned long rs_paused; | |
945 | /* block not up-to-date at mark [unit BM_BLOCK_SIZE] */ | |
946 | unsigned long rs_mark_left; | |
947 | /* marks's time [unit jiffies] */ | |
948 | unsigned long rs_mark_time; | |
949 | /* skipped because csum was equeal [unit BM_BLOCK_SIZE] */ | |
950 | unsigned long rs_same_csum; | |
951 | ||
952 | /* where does the admin want us to start? (sector) */ | |
953 | sector_t ov_start_sector; | |
954 | /* where are we now? (sector) */ | |
955 | sector_t ov_position; | |
956 | /* Start sector of out of sync range (to merge printk reporting). */ | |
957 | sector_t ov_last_oos_start; | |
958 | /* size of out-of-sync range in sectors. */ | |
959 | sector_t ov_last_oos_size; | |
960 | unsigned long ov_left; /* in bits */ | |
961 | struct crypto_hash *csums_tfm; | |
962 | struct crypto_hash *verify_tfm; | |
963 | ||
964 | struct drbd_thread receiver; | |
965 | struct drbd_thread worker; | |
966 | struct drbd_thread asender; | |
967 | struct drbd_bitmap *bitmap; | |
968 | unsigned long bm_resync_fo; /* bit offset for drbd_bm_find_next */ | |
969 | ||
970 | /* Used to track operations of resync... */ | |
971 | struct lru_cache *resync; | |
972 | /* Number of locked elements in resync LRU */ | |
973 | unsigned int resync_locked; | |
974 | /* resync extent number waiting for application requests */ | |
975 | unsigned int resync_wenr; | |
976 | ||
977 | int open_cnt; | |
978 | u64 *p_uuid; | |
979 | struct drbd_epoch *current_epoch; | |
980 | spinlock_t epoch_lock; | |
981 | unsigned int epochs; | |
982 | enum write_ordering_e write_ordering; | |
983 | struct list_head active_ee; /* IO in progress */ | |
984 | struct list_head sync_ee; /* IO in progress */ | |
985 | struct list_head done_ee; /* send ack */ | |
986 | struct list_head read_ee; /* IO in progress */ | |
987 | struct list_head net_ee; /* zero-copy network send in progress */ | |
988 | struct hlist_head *ee_hash; /* is proteced by req_lock! */ | |
989 | unsigned int ee_hash_s; | |
990 | ||
991 | /* this one is protected by ee_lock, single thread */ | |
992 | struct drbd_epoch_entry *last_write_w_barrier; | |
993 | ||
994 | int next_barrier_nr; | |
995 | struct hlist_head *app_reads_hash; /* is proteced by req_lock */ | |
996 | struct list_head resync_reads; | |
997 | atomic_t pp_in_use; | |
998 | wait_queue_head_t ee_wait; | |
999 | struct page *md_io_page; /* one page buffer for md_io */ | |
1000 | struct page *md_io_tmpp; /* for logical_block_size != 512 */ | |
1001 | struct mutex md_io_mutex; /* protects the md_io_buffer */ | |
1002 | spinlock_t al_lock; | |
1003 | wait_queue_head_t al_wait; | |
1004 | struct lru_cache *act_log; /* activity log */ | |
1005 | unsigned int al_tr_number; | |
1006 | int al_tr_cycle; | |
1007 | int al_tr_pos; /* position of the next transaction in the journal */ | |
1008 | struct crypto_hash *cram_hmac_tfm; | |
1009 | struct crypto_hash *integrity_w_tfm; /* to be used by the worker thread */ | |
1010 | struct crypto_hash *integrity_r_tfm; /* to be used by the receiver thread */ | |
1011 | void *int_dig_out; | |
1012 | void *int_dig_in; | |
1013 | void *int_dig_vv; | |
1014 | wait_queue_head_t seq_wait; | |
1015 | atomic_t packet_seq; | |
1016 | unsigned int peer_seq; | |
1017 | spinlock_t peer_seq_lock; | |
1018 | unsigned int minor; | |
1019 | unsigned long comm_bm_set; /* communicated number of set bits. */ | |
1020 | cpumask_var_t cpu_mask; | |
1021 | struct bm_io_work bm_io_work; | |
1022 | u64 ed_uuid; /* UUID of the exposed data */ | |
1023 | struct mutex state_mutex; | |
1024 | char congestion_reason; /* Why we where congested... */ | |
1025 | }; | |
1026 | ||
1027 | static inline struct drbd_conf *minor_to_mdev(unsigned int minor) | |
1028 | { | |
1029 | struct drbd_conf *mdev; | |
1030 | ||
1031 | mdev = minor < minor_count ? minor_table[minor] : NULL; | |
1032 | ||
1033 | return mdev; | |
1034 | } | |
1035 | ||
1036 | static inline unsigned int mdev_to_minor(struct drbd_conf *mdev) | |
1037 | { | |
1038 | return mdev->minor; | |
1039 | } | |
1040 | ||
1041 | /* returns 1 if it was successfull, | |
1042 | * returns 0 if there was no data socket. | |
1043 | * so wherever you are going to use the data.socket, e.g. do | |
1044 | * if (!drbd_get_data_sock(mdev)) | |
1045 | * return 0; | |
1046 | * CODE(); | |
1047 | * drbd_put_data_sock(mdev); | |
1048 | */ | |
1049 | static inline int drbd_get_data_sock(struct drbd_conf *mdev) | |
1050 | { | |
1051 | mutex_lock(&mdev->data.mutex); | |
1052 | /* drbd_disconnect() could have called drbd_free_sock() | |
1053 | * while we were waiting in down()... */ | |
1054 | if (unlikely(mdev->data.socket == NULL)) { | |
1055 | mutex_unlock(&mdev->data.mutex); | |
1056 | return 0; | |
1057 | } | |
1058 | return 1; | |
1059 | } | |
1060 | ||
1061 | static inline void drbd_put_data_sock(struct drbd_conf *mdev) | |
1062 | { | |
1063 | mutex_unlock(&mdev->data.mutex); | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * function declarations | |
1068 | *************************/ | |
1069 | ||
1070 | /* drbd_main.c */ | |
1071 | ||
1072 | enum chg_state_flags { | |
1073 | CS_HARD = 1, | |
1074 | CS_VERBOSE = 2, | |
1075 | CS_WAIT_COMPLETE = 4, | |
1076 | CS_SERIALIZE = 8, | |
1077 | CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE, | |
1078 | }; | |
1079 | ||
1080 | extern void drbd_init_set_defaults(struct drbd_conf *mdev); | |
1081 | extern int drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, | |
1082 | union drbd_state mask, union drbd_state val); | |
1083 | extern void drbd_force_state(struct drbd_conf *, union drbd_state, | |
1084 | union drbd_state); | |
1085 | extern int _drbd_request_state(struct drbd_conf *, union drbd_state, | |
1086 | union drbd_state, enum chg_state_flags); | |
1087 | extern int __drbd_set_state(struct drbd_conf *, union drbd_state, | |
1088 | enum chg_state_flags, struct completion *done); | |
1089 | extern void print_st_err(struct drbd_conf *, union drbd_state, | |
1090 | union drbd_state, int); | |
1091 | extern int drbd_thread_start(struct drbd_thread *thi); | |
1092 | extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait); | |
1093 | #ifdef CONFIG_SMP | |
1094 | extern void drbd_thread_current_set_cpu(struct drbd_conf *mdev); | |
1095 | extern void drbd_calc_cpu_mask(struct drbd_conf *mdev); | |
1096 | #else | |
1097 | #define drbd_thread_current_set_cpu(A) ({}) | |
1098 | #define drbd_calc_cpu_mask(A) ({}) | |
1099 | #endif | |
1100 | extern void drbd_free_resources(struct drbd_conf *mdev); | |
1101 | extern void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr, | |
1102 | unsigned int set_size); | |
1103 | extern void tl_clear(struct drbd_conf *mdev); | |
1104 | extern void _tl_add_barrier(struct drbd_conf *, struct drbd_tl_epoch *); | |
1105 | extern void drbd_free_sock(struct drbd_conf *mdev); | |
1106 | extern int drbd_send(struct drbd_conf *mdev, struct socket *sock, | |
1107 | void *buf, size_t size, unsigned msg_flags); | |
1108 | extern int drbd_send_protocol(struct drbd_conf *mdev); | |
1109 | extern int drbd_send_uuids(struct drbd_conf *mdev); | |
1110 | extern int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev); | |
1111 | extern int drbd_send_sync_uuid(struct drbd_conf *mdev, u64 val); | |
1112 | extern int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply); | |
1113 | extern int _drbd_send_state(struct drbd_conf *mdev); | |
1114 | extern int drbd_send_state(struct drbd_conf *mdev); | |
1115 | extern int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock, | |
1116 | enum drbd_packets cmd, struct p_header *h, | |
1117 | size_t size, unsigned msg_flags); | |
1118 | #define USE_DATA_SOCKET 1 | |
1119 | #define USE_META_SOCKET 0 | |
1120 | extern int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket, | |
1121 | enum drbd_packets cmd, struct p_header *h, | |
1122 | size_t size); | |
1123 | extern int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, | |
1124 | char *data, size_t size); | |
1125 | extern int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc); | |
1126 | extern int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, | |
1127 | u32 set_size); | |
1128 | extern int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd, | |
1129 | struct drbd_epoch_entry *e); | |
1130 | extern int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd, | |
1131 | struct p_block_req *rp); | |
1132 | extern int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd, | |
1133 | struct p_data *dp); | |
1134 | extern int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd, | |
1135 | sector_t sector, int blksize, u64 block_id); | |
1136 | extern int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd, | |
1137 | struct drbd_epoch_entry *e); | |
1138 | extern int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req); | |
1139 | extern int _drbd_send_barrier(struct drbd_conf *mdev, | |
1140 | struct drbd_tl_epoch *barrier); | |
1141 | extern int drbd_send_drequest(struct drbd_conf *mdev, int cmd, | |
1142 | sector_t sector, int size, u64 block_id); | |
1143 | extern int drbd_send_drequest_csum(struct drbd_conf *mdev, | |
1144 | sector_t sector,int size, | |
1145 | void *digest, int digest_size, | |
1146 | enum drbd_packets cmd); | |
1147 | extern int drbd_send_ov_request(struct drbd_conf *mdev,sector_t sector,int size); | |
1148 | ||
1149 | extern int drbd_send_bitmap(struct drbd_conf *mdev); | |
1150 | extern int _drbd_send_bitmap(struct drbd_conf *mdev); | |
1151 | extern int drbd_send_sr_reply(struct drbd_conf *mdev, int retcode); | |
1152 | extern void drbd_free_bc(struct drbd_backing_dev *ldev); | |
1153 | extern void drbd_mdev_cleanup(struct drbd_conf *mdev); | |
1154 | ||
1155 | /* drbd_meta-data.c (still in drbd_main.c) */ | |
1156 | extern void drbd_md_sync(struct drbd_conf *mdev); | |
1157 | extern int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev); | |
1158 | /* maybe define them below as inline? */ | |
1159 | extern void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local); | |
1160 | extern void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local); | |
1161 | extern void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local); | |
1162 | extern void _drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local); | |
1163 | extern void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local); | |
1164 | extern void drbd_md_set_flag(struct drbd_conf *mdev, int flags) __must_hold(local); | |
1165 | extern void drbd_md_clear_flag(struct drbd_conf *mdev, int flags)__must_hold(local); | |
1166 | extern int drbd_md_test_flag(struct drbd_backing_dev *, int); | |
1167 | extern void drbd_md_mark_dirty(struct drbd_conf *mdev); | |
1168 | extern void drbd_queue_bitmap_io(struct drbd_conf *mdev, | |
1169 | int (*io_fn)(struct drbd_conf *), | |
1170 | void (*done)(struct drbd_conf *, int), | |
1171 | char *why); | |
1172 | extern int drbd_bmio_set_n_write(struct drbd_conf *mdev); | |
1173 | extern int drbd_bmio_clear_n_write(struct drbd_conf *mdev); | |
1174 | extern int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why); | |
1175 | ||
1176 | ||
1177 | /* Meta data layout | |
1178 | We reserve a 128MB Block (4k aligned) | |
1179 | * either at the end of the backing device | |
1180 | * or on a seperate meta data device. */ | |
1181 | ||
1182 | #define MD_RESERVED_SECT (128LU << 11) /* 128 MB, unit sectors */ | |
1183 | /* The following numbers are sectors */ | |
1184 | #define MD_AL_OFFSET 8 /* 8 Sectors after start of meta area */ | |
1185 | #define MD_AL_MAX_SIZE 64 /* = 32 kb LOG ~ 3776 extents ~ 14 GB Storage */ | |
1186 | /* Allows up to about 3.8TB */ | |
1187 | #define MD_BM_OFFSET (MD_AL_OFFSET + MD_AL_MAX_SIZE) | |
1188 | ||
1189 | /* Since the smalles IO unit is usually 512 byte */ | |
1190 | #define MD_SECTOR_SHIFT 9 | |
1191 | #define MD_SECTOR_SIZE (1<<MD_SECTOR_SHIFT) | |
1192 | ||
1193 | /* activity log */ | |
1194 | #define AL_EXTENTS_PT ((MD_SECTOR_SIZE-12)/8-1) /* 61 ; Extents per 512B sector */ | |
1195 | #define AL_EXTENT_SHIFT 22 /* One extent represents 4M Storage */ | |
1196 | #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT) | |
1197 | ||
1198 | #if BITS_PER_LONG == 32 | |
1199 | #define LN2_BPL 5 | |
1200 | #define cpu_to_lel(A) cpu_to_le32(A) | |
1201 | #define lel_to_cpu(A) le32_to_cpu(A) | |
1202 | #elif BITS_PER_LONG == 64 | |
1203 | #define LN2_BPL 6 | |
1204 | #define cpu_to_lel(A) cpu_to_le64(A) | |
1205 | #define lel_to_cpu(A) le64_to_cpu(A) | |
1206 | #else | |
1207 | #error "LN2 of BITS_PER_LONG unknown!" | |
1208 | #endif | |
1209 | ||
1210 | /* resync bitmap */ | |
1211 | /* 16MB sized 'bitmap extent' to track syncer usage */ | |
1212 | struct bm_extent { | |
1213 | int rs_left; /* number of bits set (out of sync) in this extent. */ | |
1214 | int rs_failed; /* number of failed resync requests in this extent. */ | |
1215 | unsigned long flags; | |
1216 | struct lc_element lce; | |
1217 | }; | |
1218 | ||
1219 | #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */ | |
1220 | #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */ | |
1221 | ||
1222 | /* drbd_bitmap.c */ | |
1223 | /* | |
1224 | * We need to store one bit for a block. | |
1225 | * Example: 1GB disk @ 4096 byte blocks ==> we need 32 KB bitmap. | |
1226 | * Bit 0 ==> local node thinks this block is binary identical on both nodes | |
1227 | * Bit 1 ==> local node thinks this block needs to be synced. | |
1228 | */ | |
1229 | ||
1230 | #define BM_BLOCK_SHIFT 12 /* 4k per bit */ | |
1231 | #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT) | |
1232 | /* (9+3) : 512 bytes @ 8 bits; representing 16M storage | |
1233 | * per sector of on disk bitmap */ | |
1234 | #define BM_EXT_SHIFT (BM_BLOCK_SHIFT + MD_SECTOR_SHIFT + 3) /* = 24 */ | |
1235 | #define BM_EXT_SIZE (1<<BM_EXT_SHIFT) | |
1236 | ||
1237 | #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12) | |
1238 | #error "HAVE YOU FIXED drbdmeta AS WELL??" | |
1239 | #endif | |
1240 | ||
1241 | /* thus many _storage_ sectors are described by one bit */ | |
1242 | #define BM_SECT_TO_BIT(x) ((x)>>(BM_BLOCK_SHIFT-9)) | |
1243 | #define BM_BIT_TO_SECT(x) ((sector_t)(x)<<(BM_BLOCK_SHIFT-9)) | |
1244 | #define BM_SECT_PER_BIT BM_BIT_TO_SECT(1) | |
1245 | ||
1246 | /* bit to represented kilo byte conversion */ | |
1247 | #define Bit2KB(bits) ((bits)<<(BM_BLOCK_SHIFT-10)) | |
1248 | ||
1249 | /* in which _bitmap_ extent (resp. sector) the bit for a certain | |
1250 | * _storage_ sector is located in */ | |
1251 | #define BM_SECT_TO_EXT(x) ((x)>>(BM_EXT_SHIFT-9)) | |
1252 | ||
1253 | /* how much _storage_ sectors we have per bitmap sector */ | |
1254 | #define BM_EXT_TO_SECT(x) ((sector_t)(x) << (BM_EXT_SHIFT-9)) | |
1255 | #define BM_SECT_PER_EXT BM_EXT_TO_SECT(1) | |
1256 | ||
1257 | /* in one sector of the bitmap, we have this many activity_log extents. */ | |
1258 | #define AL_EXT_PER_BM_SECT (1 << (BM_EXT_SHIFT - AL_EXTENT_SHIFT)) | |
1259 | #define BM_WORDS_PER_AL_EXT (1 << (AL_EXTENT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL)) | |
1260 | ||
1261 | #define BM_BLOCKS_PER_BM_EXT_B (BM_EXT_SHIFT - BM_BLOCK_SHIFT) | |
1262 | #define BM_BLOCKS_PER_BM_EXT_MASK ((1<<BM_BLOCKS_PER_BM_EXT_B) - 1) | |
1263 | ||
1264 | /* the extent in "PER_EXTENT" below is an activity log extent | |
1265 | * we need that many (long words/bytes) to store the bitmap | |
1266 | * of one AL_EXTENT_SIZE chunk of storage. | |
1267 | * we can store the bitmap for that many AL_EXTENTS within | |
1268 | * one sector of the _on_disk_ bitmap: | |
1269 | * bit 0 bit 37 bit 38 bit (512*8)-1 | |
1270 | * ...|........|........|.. // ..|........| | |
1271 | * sect. 0 `296 `304 ^(512*8*8)-1 | |
1272 | * | |
1273 | #define BM_WORDS_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / BITS_PER_LONG ) | |
1274 | #define BM_BYTES_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / 8 ) // 128 | |
1275 | #define BM_EXT_PER_SECT ( 512 / BM_BYTES_PER_EXTENT ) // 4 | |
1276 | */ | |
1277 | ||
1278 | #define DRBD_MAX_SECTORS_32 (0xffffffffLU) | |
1279 | #define DRBD_MAX_SECTORS_BM \ | |
1280 | ((MD_RESERVED_SECT - MD_BM_OFFSET) * (1LL<<(BM_EXT_SHIFT-9))) | |
1281 | #if DRBD_MAX_SECTORS_BM < DRBD_MAX_SECTORS_32 | |
1282 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM | |
1283 | #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_BM | |
1284 | #elif !defined(CONFIG_LBD) && BITS_PER_LONG == 32 | |
1285 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_32 | |
1286 | #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_32 | |
1287 | #else | |
1288 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM | |
1289 | /* 16 TB in units of sectors */ | |
1290 | #if BITS_PER_LONG == 32 | |
1291 | /* adjust by one page worth of bitmap, | |
1292 | * so we won't wrap around in drbd_bm_find_next_bit. | |
1293 | * you should use 64bit OS for that much storage, anyways. */ | |
1294 | #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) | |
1295 | #else | |
1296 | #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0x1LU << 32) | |
1297 | #endif | |
1298 | #endif | |
1299 | ||
1300 | /* Sector shift value for the "hash" functions of tl_hash and ee_hash tables. | |
1301 | * With a value of 6 all IO in one 32K block make it to the same slot of the | |
1302 | * hash table. */ | |
1303 | #define HT_SHIFT 6 | |
1304 | #define DRBD_MAX_SEGMENT_SIZE (1U<<(9+HT_SHIFT)) | |
1305 | ||
1306 | /* Number of elements in the app_reads_hash */ | |
1307 | #define APP_R_HSIZE 15 | |
1308 | ||
1309 | extern int drbd_bm_init(struct drbd_conf *mdev); | |
1310 | extern int drbd_bm_resize(struct drbd_conf *mdev, sector_t sectors); | |
1311 | extern void drbd_bm_cleanup(struct drbd_conf *mdev); | |
1312 | extern void drbd_bm_set_all(struct drbd_conf *mdev); | |
1313 | extern void drbd_bm_clear_all(struct drbd_conf *mdev); | |
1314 | extern int drbd_bm_set_bits( | |
1315 | struct drbd_conf *mdev, unsigned long s, unsigned long e); | |
1316 | extern int drbd_bm_clear_bits( | |
1317 | struct drbd_conf *mdev, unsigned long s, unsigned long e); | |
1318 | /* bm_set_bits variant for use while holding drbd_bm_lock */ | |
1319 | extern void _drbd_bm_set_bits(struct drbd_conf *mdev, | |
1320 | const unsigned long s, const unsigned long e); | |
1321 | extern int drbd_bm_test_bit(struct drbd_conf *mdev, unsigned long bitnr); | |
1322 | extern int drbd_bm_e_weight(struct drbd_conf *mdev, unsigned long enr); | |
1323 | extern int drbd_bm_write_sect(struct drbd_conf *mdev, unsigned long enr) __must_hold(local); | |
1324 | extern int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local); | |
1325 | extern int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local); | |
1326 | extern unsigned long drbd_bm_ALe_set_all(struct drbd_conf *mdev, | |
1327 | unsigned long al_enr); | |
1328 | extern size_t drbd_bm_words(struct drbd_conf *mdev); | |
1329 | extern unsigned long drbd_bm_bits(struct drbd_conf *mdev); | |
1330 | extern sector_t drbd_bm_capacity(struct drbd_conf *mdev); | |
1331 | extern unsigned long drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); | |
1332 | /* bm_find_next variants for use while you hold drbd_bm_lock() */ | |
1333 | extern unsigned long _drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); | |
1334 | extern unsigned long _drbd_bm_find_next_zero(struct drbd_conf *mdev, unsigned long bm_fo); | |
1335 | extern unsigned long drbd_bm_total_weight(struct drbd_conf *mdev); | |
1336 | extern int drbd_bm_rs_done(struct drbd_conf *mdev); | |
1337 | /* for receive_bitmap */ | |
1338 | extern void drbd_bm_merge_lel(struct drbd_conf *mdev, size_t offset, | |
1339 | size_t number, unsigned long *buffer); | |
1340 | /* for _drbd_send_bitmap and drbd_bm_write_sect */ | |
1341 | extern void drbd_bm_get_lel(struct drbd_conf *mdev, size_t offset, | |
1342 | size_t number, unsigned long *buffer); | |
1343 | ||
1344 | extern void drbd_bm_lock(struct drbd_conf *mdev, char *why); | |
1345 | extern void drbd_bm_unlock(struct drbd_conf *mdev); | |
1346 | ||
1347 | extern int drbd_bm_count_bits(struct drbd_conf *mdev, const unsigned long s, const unsigned long e); | |
1348 | /* drbd_main.c */ | |
1349 | ||
1350 | extern struct kmem_cache *drbd_request_cache; | |
1351 | extern struct kmem_cache *drbd_ee_cache; /* epoch entries */ | |
1352 | extern struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ | |
1353 | extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ | |
1354 | extern mempool_t *drbd_request_mempool; | |
1355 | extern mempool_t *drbd_ee_mempool; | |
1356 | ||
1357 | extern struct page *drbd_pp_pool; /* drbd's page pool */ | |
1358 | extern spinlock_t drbd_pp_lock; | |
1359 | extern int drbd_pp_vacant; | |
1360 | extern wait_queue_head_t drbd_pp_wait; | |
1361 | ||
1362 | extern rwlock_t global_state_lock; | |
1363 | ||
1364 | extern struct drbd_conf *drbd_new_device(unsigned int minor); | |
1365 | extern void drbd_free_mdev(struct drbd_conf *mdev); | |
1366 | ||
1367 | extern int proc_details; | |
1368 | ||
1369 | /* drbd_req */ | |
1370 | extern int drbd_make_request_26(struct request_queue *q, struct bio *bio); | |
1371 | extern int drbd_read_remote(struct drbd_conf *mdev, struct drbd_request *req); | |
1372 | extern int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *bvec); | |
1373 | extern int is_valid_ar_handle(struct drbd_request *, sector_t); | |
1374 | ||
1375 | ||
1376 | /* drbd_nl.c */ | |
1377 | extern void drbd_suspend_io(struct drbd_conf *mdev); | |
1378 | extern void drbd_resume_io(struct drbd_conf *mdev); | |
1379 | extern char *ppsize(char *buf, unsigned long long size); | |
1380 | extern sector_t drbd_new_dev_size(struct drbd_conf *, | |
1381 | struct drbd_backing_dev *); | |
1382 | enum determine_dev_size { dev_size_error = -1, unchanged = 0, shrunk = 1, grew = 2 }; | |
1383 | extern enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *) __must_hold(local); | |
1384 | extern void resync_after_online_grow(struct drbd_conf *); | |
1385 | extern void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int) __must_hold(local); | |
1386 | extern int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, | |
1387 | int force); | |
1388 | enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev); | |
1389 | extern int drbd_khelper(struct drbd_conf *mdev, char *cmd); | |
1390 | ||
1391 | /* drbd_worker.c */ | |
1392 | extern int drbd_worker(struct drbd_thread *thi); | |
1393 | extern int drbd_alter_sa(struct drbd_conf *mdev, int na); | |
1394 | extern void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side); | |
1395 | extern void resume_next_sg(struct drbd_conf *mdev); | |
1396 | extern void suspend_other_sg(struct drbd_conf *mdev); | |
1397 | extern int drbd_resync_finished(struct drbd_conf *mdev); | |
1398 | /* maybe rather drbd_main.c ? */ | |
1399 | extern int drbd_md_sync_page_io(struct drbd_conf *mdev, | |
1400 | struct drbd_backing_dev *bdev, sector_t sector, int rw); | |
1401 | extern void drbd_ov_oos_found(struct drbd_conf*, sector_t, int); | |
1402 | ||
1403 | static inline void ov_oos_print(struct drbd_conf *mdev) | |
1404 | { | |
1405 | if (mdev->ov_last_oos_size) { | |
1406 | dev_err(DEV, "Out of sync: start=%llu, size=%lu (sectors)\n", | |
1407 | (unsigned long long)mdev->ov_last_oos_start, | |
1408 | (unsigned long)mdev->ov_last_oos_size); | |
1409 | } | |
1410 | mdev->ov_last_oos_size=0; | |
1411 | } | |
1412 | ||
1413 | ||
1414 | extern void drbd_csum(struct drbd_conf *, struct crypto_hash *, struct bio *, void *); | |
1415 | /* worker callbacks */ | |
1416 | extern int w_req_cancel_conflict(struct drbd_conf *, struct drbd_work *, int); | |
1417 | extern int w_read_retry_remote(struct drbd_conf *, struct drbd_work *, int); | |
1418 | extern int w_e_end_data_req(struct drbd_conf *, struct drbd_work *, int); | |
1419 | extern int w_e_end_rsdata_req(struct drbd_conf *, struct drbd_work *, int); | |
1420 | extern int w_e_end_csum_rs_req(struct drbd_conf *, struct drbd_work *, int); | |
1421 | extern int w_e_end_ov_reply(struct drbd_conf *, struct drbd_work *, int); | |
1422 | extern int w_e_end_ov_req(struct drbd_conf *, struct drbd_work *, int); | |
1423 | extern int w_ov_finished(struct drbd_conf *, struct drbd_work *, int); | |
1424 | extern int w_resync_inactive(struct drbd_conf *, struct drbd_work *, int); | |
1425 | extern int w_resume_next_sg(struct drbd_conf *, struct drbd_work *, int); | |
1426 | extern int w_io_error(struct drbd_conf *, struct drbd_work *, int); | |
1427 | extern int w_send_write_hint(struct drbd_conf *, struct drbd_work *, int); | |
1428 | extern int w_make_resync_request(struct drbd_conf *, struct drbd_work *, int); | |
1429 | extern int w_send_dblock(struct drbd_conf *, struct drbd_work *, int); | |
1430 | extern int w_send_barrier(struct drbd_conf *, struct drbd_work *, int); | |
1431 | extern int w_send_read_req(struct drbd_conf *, struct drbd_work *, int); | |
1432 | extern int w_prev_work_done(struct drbd_conf *, struct drbd_work *, int); | |
1433 | extern int w_e_reissue(struct drbd_conf *, struct drbd_work *, int); | |
1434 | ||
1435 | extern void resync_timer_fn(unsigned long data); | |
1436 | ||
1437 | /* drbd_receiver.c */ | |
1438 | extern int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list); | |
1439 | extern struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, | |
1440 | u64 id, | |
1441 | sector_t sector, | |
1442 | unsigned int data_size, | |
1443 | gfp_t gfp_mask) __must_hold(local); | |
1444 | extern void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e); | |
1445 | extern void drbd_wait_ee_list_empty(struct drbd_conf *mdev, | |
1446 | struct list_head *head); | |
1447 | extern void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, | |
1448 | struct list_head *head); | |
1449 | extern void drbd_set_recv_tcq(struct drbd_conf *mdev, int tcq_enabled); | |
1450 | extern void _drbd_clear_done_ee(struct drbd_conf *mdev, struct list_head *to_be_freed); | |
1451 | extern void drbd_flush_workqueue(struct drbd_conf *mdev); | |
1452 | ||
1453 | /* yes, there is kernel_setsockopt, but only since 2.6.18. we don't need to | |
1454 | * mess with get_fs/set_fs, we know we are KERNEL_DS always. */ | |
1455 | static inline int drbd_setsockopt(struct socket *sock, int level, int optname, | |
1456 | char __user *optval, int optlen) | |
1457 | { | |
1458 | int err; | |
1459 | if (level == SOL_SOCKET) | |
1460 | err = sock_setsockopt(sock, level, optname, optval, optlen); | |
1461 | else | |
1462 | err = sock->ops->setsockopt(sock, level, optname, optval, | |
1463 | optlen); | |
1464 | return err; | |
1465 | } | |
1466 | ||
1467 | static inline void drbd_tcp_cork(struct socket *sock) | |
1468 | { | |
1469 | int __user val = 1; | |
1470 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, | |
1471 | (char __user *)&val, sizeof(val)); | |
1472 | } | |
1473 | ||
1474 | static inline void drbd_tcp_uncork(struct socket *sock) | |
1475 | { | |
1476 | int __user val = 0; | |
1477 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, | |
1478 | (char __user *)&val, sizeof(val)); | |
1479 | } | |
1480 | ||
1481 | static inline void drbd_tcp_nodelay(struct socket *sock) | |
1482 | { | |
1483 | int __user val = 1; | |
1484 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_NODELAY, | |
1485 | (char __user *)&val, sizeof(val)); | |
1486 | } | |
1487 | ||
1488 | static inline void drbd_tcp_quickack(struct socket *sock) | |
1489 | { | |
1490 | int __user val = 1; | |
1491 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_QUICKACK, | |
1492 | (char __user *)&val, sizeof(val)); | |
1493 | } | |
1494 | ||
1495 | void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo); | |
1496 | ||
1497 | /* drbd_proc.c */ | |
1498 | extern struct proc_dir_entry *drbd_proc; | |
1499 | extern struct file_operations drbd_proc_fops; | |
1500 | extern const char *drbd_conn_str(enum drbd_conns s); | |
1501 | extern const char *drbd_role_str(enum drbd_role s); | |
1502 | ||
1503 | /* drbd_actlog.c */ | |
1504 | extern void drbd_al_begin_io(struct drbd_conf *mdev, sector_t sector); | |
1505 | extern void drbd_al_complete_io(struct drbd_conf *mdev, sector_t sector); | |
1506 | extern void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector); | |
1507 | extern int drbd_rs_begin_io(struct drbd_conf *mdev, sector_t sector); | |
1508 | extern int drbd_try_rs_begin_io(struct drbd_conf *mdev, sector_t sector); | |
1509 | extern void drbd_rs_cancel_all(struct drbd_conf *mdev); | |
1510 | extern int drbd_rs_del_all(struct drbd_conf *mdev); | |
1511 | extern void drbd_rs_failed_io(struct drbd_conf *mdev, | |
1512 | sector_t sector, int size); | |
1513 | extern int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *); | |
1514 | extern void __drbd_set_in_sync(struct drbd_conf *mdev, sector_t sector, | |
1515 | int size, const char *file, const unsigned int line); | |
1516 | #define drbd_set_in_sync(mdev, sector, size) \ | |
1517 | __drbd_set_in_sync(mdev, sector, size, __FILE__, __LINE__) | |
1518 | extern void __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, | |
1519 | int size, const char *file, const unsigned int line); | |
1520 | #define drbd_set_out_of_sync(mdev, sector, size) \ | |
1521 | __drbd_set_out_of_sync(mdev, sector, size, __FILE__, __LINE__) | |
1522 | extern void drbd_al_apply_to_bm(struct drbd_conf *mdev); | |
1523 | extern void drbd_al_to_on_disk_bm(struct drbd_conf *mdev); | |
1524 | extern void drbd_al_shrink(struct drbd_conf *mdev); | |
1525 | ||
1526 | ||
1527 | /* drbd_nl.c */ | |
1528 | ||
1529 | void drbd_nl_cleanup(void); | |
1530 | int __init drbd_nl_init(void); | |
1531 | void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state); | |
1532 | void drbd_bcast_sync_progress(struct drbd_conf *mdev); | |
1533 | void drbd_bcast_ee(struct drbd_conf *mdev, | |
1534 | const char *reason, const int dgs, | |
1535 | const char* seen_hash, const char* calc_hash, | |
1536 | const struct drbd_epoch_entry* e); | |
1537 | ||
1538 | ||
1539 | /** | |
1540 | * DOC: DRBD State macros | |
1541 | * | |
1542 | * These macros are used to express state changes in easily readable form. | |
1543 | * | |
1544 | * The NS macros expand to a mask and a value, that can be bit ored onto the | |
1545 | * current state as soon as the spinlock (req_lock) was taken. | |
1546 | * | |
1547 | * The _NS macros are used for state functions that get called with the | |
1548 | * spinlock. These macros expand directly to the new state value. | |
1549 | * | |
1550 | * Besides the basic forms NS() and _NS() additional _?NS[23] are defined | |
1551 | * to express state changes that affect more than one aspect of the state. | |
1552 | * | |
1553 | * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY) | |
1554 | * Means that the network connection was established and that the peer | |
1555 | * is in secondary role. | |
1556 | */ | |
1557 | #define role_MASK R_MASK | |
1558 | #define peer_MASK R_MASK | |
1559 | #define disk_MASK D_MASK | |
1560 | #define pdsk_MASK D_MASK | |
1561 | #define conn_MASK C_MASK | |
1562 | #define susp_MASK 1 | |
1563 | #define user_isp_MASK 1 | |
1564 | #define aftr_isp_MASK 1 | |
1565 | ||
1566 | #define NS(T, S) \ | |
1567 | ({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \ | |
1568 | ({ union drbd_state val; val.i = 0; val.T = (S); val; }) | |
1569 | #define NS2(T1, S1, T2, S2) \ | |
1570 | ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ | |
1571 | mask.T2 = T2##_MASK; mask; }), \ | |
1572 | ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ | |
1573 | val.T2 = (S2); val; }) | |
1574 | #define NS3(T1, S1, T2, S2, T3, S3) \ | |
1575 | ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ | |
1576 | mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \ | |
1577 | ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ | |
1578 | val.T2 = (S2); val.T3 = (S3); val; }) | |
1579 | ||
1580 | #define _NS(D, T, S) \ | |
1581 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T = (S); __ns; }) | |
1582 | #define _NS2(D, T1, S1, T2, S2) \ | |
1583 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ | |
1584 | __ns.T2 = (S2); __ns; }) | |
1585 | #define _NS3(D, T1, S1, T2, S2, T3, S3) \ | |
1586 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ | |
1587 | __ns.T2 = (S2); __ns.T3 = (S3); __ns; }) | |
1588 | ||
1589 | /* | |
1590 | * inline helper functions | |
1591 | *************************/ | |
1592 | ||
1593 | static inline void drbd_state_lock(struct drbd_conf *mdev) | |
1594 | { | |
1595 | wait_event(mdev->misc_wait, | |
1596 | !test_and_set_bit(CLUSTER_ST_CHANGE, &mdev->flags)); | |
1597 | } | |
1598 | ||
1599 | static inline void drbd_state_unlock(struct drbd_conf *mdev) | |
1600 | { | |
1601 | clear_bit(CLUSTER_ST_CHANGE, &mdev->flags); | |
1602 | wake_up(&mdev->misc_wait); | |
1603 | } | |
1604 | ||
1605 | static inline int _drbd_set_state(struct drbd_conf *mdev, | |
1606 | union drbd_state ns, enum chg_state_flags flags, | |
1607 | struct completion *done) | |
1608 | { | |
1609 | int rv; | |
1610 | ||
1611 | read_lock(&global_state_lock); | |
1612 | rv = __drbd_set_state(mdev, ns, flags, done); | |
1613 | read_unlock(&global_state_lock); | |
1614 | ||
1615 | return rv; | |
1616 | } | |
1617 | ||
1618 | /** | |
1619 | * drbd_request_state() - Reqest a state change | |
1620 | * @mdev: DRBD device. | |
1621 | * @mask: mask of state bits to change. | |
1622 | * @val: value of new state bits. | |
1623 | * | |
1624 | * This is the most graceful way of requesting a state change. It is verbose | |
1625 | * quite verbose in case the state change is not possible, and all those | |
1626 | * state changes are globally serialized. | |
1627 | */ | |
1628 | static inline int drbd_request_state(struct drbd_conf *mdev, | |
1629 | union drbd_state mask, | |
1630 | union drbd_state val) | |
1631 | { | |
1632 | return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED); | |
1633 | } | |
1634 | ||
1635 | #define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__) | |
1636 | static inline void __drbd_chk_io_error_(struct drbd_conf *mdev, int forcedetach, const char *where) | |
1637 | { | |
1638 | switch (mdev->ldev->dc.on_io_error) { | |
1639 | case EP_PASS_ON: | |
1640 | if (!forcedetach) { | |
1641 | if (printk_ratelimit()) | |
1642 | dev_err(DEV, "Local IO failed in %s." | |
1643 | "Passing error on...\n", where); | |
1644 | break; | |
1645 | } | |
1646 | /* NOTE fall through to detach case if forcedetach set */ | |
1647 | case EP_DETACH: | |
1648 | case EP_CALL_HELPER: | |
1649 | if (mdev->state.disk > D_FAILED) { | |
1650 | _drbd_set_state(_NS(mdev, disk, D_FAILED), CS_HARD, NULL); | |
1651 | dev_err(DEV, "Local IO failed in %s." | |
1652 | "Detaching...\n", where); | |
1653 | } | |
1654 | break; | |
1655 | } | |
1656 | } | |
1657 | ||
1658 | /** | |
1659 | * drbd_chk_io_error: Handle the on_io_error setting, should be called from all io completion handlers | |
1660 | * @mdev: DRBD device. | |
1661 | * @error: Error code passed to the IO completion callback | |
1662 | * @forcedetach: Force detach. I.e. the error happened while accessing the meta data | |
1663 | * | |
1664 | * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED) | |
1665 | */ | |
1666 | #define drbd_chk_io_error(m,e,f) drbd_chk_io_error_(m,e,f, __func__) | |
1667 | static inline void drbd_chk_io_error_(struct drbd_conf *mdev, | |
1668 | int error, int forcedetach, const char *where) | |
1669 | { | |
1670 | if (error) { | |
1671 | unsigned long flags; | |
1672 | spin_lock_irqsave(&mdev->req_lock, flags); | |
1673 | __drbd_chk_io_error_(mdev, forcedetach, where); | |
1674 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
1675 | } | |
1676 | } | |
1677 | ||
1678 | ||
1679 | /** | |
1680 | * drbd_md_first_sector() - Returns the first sector number of the meta data area | |
1681 | * @bdev: Meta data block device. | |
1682 | * | |
1683 | * BTW, for internal meta data, this happens to be the maximum capacity | |
1684 | * we could agree upon with our peer node. | |
1685 | */ | |
1686 | static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev) | |
1687 | { | |
1688 | switch (bdev->dc.meta_dev_idx) { | |
1689 | case DRBD_MD_INDEX_INTERNAL: | |
1690 | case DRBD_MD_INDEX_FLEX_INT: | |
1691 | return bdev->md.md_offset + bdev->md.bm_offset; | |
1692 | case DRBD_MD_INDEX_FLEX_EXT: | |
1693 | default: | |
1694 | return bdev->md.md_offset; | |
1695 | } | |
1696 | } | |
1697 | ||
1698 | /** | |
1699 | * drbd_md_last_sector() - Return the last sector number of the meta data area | |
1700 | * @bdev: Meta data block device. | |
1701 | */ | |
1702 | static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev) | |
1703 | { | |
1704 | switch (bdev->dc.meta_dev_idx) { | |
1705 | case DRBD_MD_INDEX_INTERNAL: | |
1706 | case DRBD_MD_INDEX_FLEX_INT: | |
1707 | return bdev->md.md_offset + MD_AL_OFFSET - 1; | |
1708 | case DRBD_MD_INDEX_FLEX_EXT: | |
1709 | default: | |
1710 | return bdev->md.md_offset + bdev->md.md_size_sect; | |
1711 | } | |
1712 | } | |
1713 | ||
1714 | /* Returns the number of 512 byte sectors of the device */ | |
1715 | static inline sector_t drbd_get_capacity(struct block_device *bdev) | |
1716 | { | |
1717 | /* return bdev ? get_capacity(bdev->bd_disk) : 0; */ | |
1718 | return bdev ? bdev->bd_inode->i_size >> 9 : 0; | |
1719 | } | |
1720 | ||
1721 | /** | |
1722 | * drbd_get_max_capacity() - Returns the capacity we announce to out peer | |
1723 | * @bdev: Meta data block device. | |
1724 | * | |
1725 | * returns the capacity we announce to out peer. we clip ourselves at the | |
1726 | * various MAX_SECTORS, because if we don't, current implementation will | |
1727 | * oops sooner or later | |
1728 | */ | |
1729 | static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) | |
1730 | { | |
1731 | sector_t s; | |
1732 | switch (bdev->dc.meta_dev_idx) { | |
1733 | case DRBD_MD_INDEX_INTERNAL: | |
1734 | case DRBD_MD_INDEX_FLEX_INT: | |
1735 | s = drbd_get_capacity(bdev->backing_bdev) | |
1736 | ? min_t(sector_t, DRBD_MAX_SECTORS_FLEX, | |
1737 | drbd_md_first_sector(bdev)) | |
1738 | : 0; | |
1739 | break; | |
1740 | case DRBD_MD_INDEX_FLEX_EXT: | |
1741 | s = min_t(sector_t, DRBD_MAX_SECTORS_FLEX, | |
1742 | drbd_get_capacity(bdev->backing_bdev)); | |
1743 | /* clip at maximum size the meta device can support */ | |
1744 | s = min_t(sector_t, s, | |
1745 | BM_EXT_TO_SECT(bdev->md.md_size_sect | |
1746 | - bdev->md.bm_offset)); | |
1747 | break; | |
1748 | default: | |
1749 | s = min_t(sector_t, DRBD_MAX_SECTORS, | |
1750 | drbd_get_capacity(bdev->backing_bdev)); | |
1751 | } | |
1752 | return s; | |
1753 | } | |
1754 | ||
1755 | /** | |
1756 | * drbd_md_ss__() - Return the sector number of our meta data super block | |
1757 | * @mdev: DRBD device. | |
1758 | * @bdev: Meta data block device. | |
1759 | */ | |
1760 | static inline sector_t drbd_md_ss__(struct drbd_conf *mdev, | |
1761 | struct drbd_backing_dev *bdev) | |
1762 | { | |
1763 | switch (bdev->dc.meta_dev_idx) { | |
1764 | default: /* external, some index */ | |
1765 | return MD_RESERVED_SECT * bdev->dc.meta_dev_idx; | |
1766 | case DRBD_MD_INDEX_INTERNAL: | |
1767 | /* with drbd08, internal meta data is always "flexible" */ | |
1768 | case DRBD_MD_INDEX_FLEX_INT: | |
1769 | /* sizeof(struct md_on_disk_07) == 4k | |
1770 | * position: last 4k aligned block of 4k size */ | |
1771 | if (!bdev->backing_bdev) { | |
1772 | if (__ratelimit(&drbd_ratelimit_state)) { | |
1773 | dev_err(DEV, "bdev->backing_bdev==NULL\n"); | |
1774 | dump_stack(); | |
1775 | } | |
1776 | return 0; | |
1777 | } | |
1778 | return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) | |
1779 | - MD_AL_OFFSET; | |
1780 | case DRBD_MD_INDEX_FLEX_EXT: | |
1781 | return 0; | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | static inline void | |
1786 | _drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) | |
1787 | { | |
1788 | list_add_tail(&w->list, &q->q); | |
1789 | up(&q->s); | |
1790 | } | |
1791 | ||
1792 | static inline void | |
1793 | drbd_queue_work_front(struct drbd_work_queue *q, struct drbd_work *w) | |
1794 | { | |
1795 | unsigned long flags; | |
1796 | spin_lock_irqsave(&q->q_lock, flags); | |
1797 | list_add(&w->list, &q->q); | |
1798 | up(&q->s); /* within the spinlock, | |
1799 | see comment near end of drbd_worker() */ | |
1800 | spin_unlock_irqrestore(&q->q_lock, flags); | |
1801 | } | |
1802 | ||
1803 | static inline void | |
1804 | drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) | |
1805 | { | |
1806 | unsigned long flags; | |
1807 | spin_lock_irqsave(&q->q_lock, flags); | |
1808 | list_add_tail(&w->list, &q->q); | |
1809 | up(&q->s); /* within the spinlock, | |
1810 | see comment near end of drbd_worker() */ | |
1811 | spin_unlock_irqrestore(&q->q_lock, flags); | |
1812 | } | |
1813 | ||
1814 | static inline void wake_asender(struct drbd_conf *mdev) | |
1815 | { | |
1816 | if (test_bit(SIGNAL_ASENDER, &mdev->flags)) | |
1817 | force_sig(DRBD_SIG, mdev->asender.task); | |
1818 | } | |
1819 | ||
1820 | static inline void request_ping(struct drbd_conf *mdev) | |
1821 | { | |
1822 | set_bit(SEND_PING, &mdev->flags); | |
1823 | wake_asender(mdev); | |
1824 | } | |
1825 | ||
1826 | static inline int drbd_send_short_cmd(struct drbd_conf *mdev, | |
1827 | enum drbd_packets cmd) | |
1828 | { | |
1829 | struct p_header h; | |
1830 | return drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd, &h, sizeof(h)); | |
1831 | } | |
1832 | ||
1833 | static inline int drbd_send_ping(struct drbd_conf *mdev) | |
1834 | { | |
1835 | struct p_header h; | |
1836 | return drbd_send_cmd(mdev, USE_META_SOCKET, P_PING, &h, sizeof(h)); | |
1837 | } | |
1838 | ||
1839 | static inline int drbd_send_ping_ack(struct drbd_conf *mdev) | |
1840 | { | |
1841 | struct p_header h; | |
1842 | return drbd_send_cmd(mdev, USE_META_SOCKET, P_PING_ACK, &h, sizeof(h)); | |
1843 | } | |
1844 | ||
1845 | static inline void drbd_thread_stop(struct drbd_thread *thi) | |
1846 | { | |
1847 | _drbd_thread_stop(thi, FALSE, TRUE); | |
1848 | } | |
1849 | ||
1850 | static inline void drbd_thread_stop_nowait(struct drbd_thread *thi) | |
1851 | { | |
1852 | _drbd_thread_stop(thi, FALSE, FALSE); | |
1853 | } | |
1854 | ||
1855 | static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) | |
1856 | { | |
1857 | _drbd_thread_stop(thi, TRUE, FALSE); | |
1858 | } | |
1859 | ||
1860 | /* counts how many answer packets packets we expect from our peer, | |
1861 | * for either explicit application requests, | |
1862 | * or implicit barrier packets as necessary. | |
1863 | * increased: | |
1864 | * w_send_barrier | |
1865 | * _req_mod(req, queue_for_net_write or queue_for_net_read); | |
1866 | * it is much easier and equally valid to count what we queue for the | |
1867 | * worker, even before it actually was queued or send. | |
1868 | * (drbd_make_request_common; recovery path on read io-error) | |
1869 | * decreased: | |
1870 | * got_BarrierAck (respective tl_clear, tl_clear_barrier) | |
1871 | * _req_mod(req, data_received) | |
1872 | * [from receive_DataReply] | |
1873 | * _req_mod(req, write_acked_by_peer or recv_acked_by_peer or neg_acked) | |
1874 | * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)] | |
1875 | * for some reason it is NOT decreased in got_NegAck, | |
1876 | * but in the resulting cleanup code from report_params. | |
1877 | * we should try to remember the reason for that... | |
1878 | * _req_mod(req, send_failed or send_canceled) | |
1879 | * _req_mod(req, connection_lost_while_pending) | |
1880 | * [from tl_clear_barrier] | |
1881 | */ | |
1882 | static inline void inc_ap_pending(struct drbd_conf *mdev) | |
1883 | { | |
1884 | atomic_inc(&mdev->ap_pending_cnt); | |
1885 | } | |
1886 | ||
1887 | #define ERR_IF_CNT_IS_NEGATIVE(which) \ | |
1888 | if (atomic_read(&mdev->which) < 0) \ | |
1889 | dev_err(DEV, "in %s:%d: " #which " = %d < 0 !\n", \ | |
1890 | __func__ , __LINE__ , \ | |
1891 | atomic_read(&mdev->which)) | |
1892 | ||
1893 | #define dec_ap_pending(mdev) do { \ | |
1894 | typecheck(struct drbd_conf *, mdev); \ | |
1895 | if (atomic_dec_and_test(&mdev->ap_pending_cnt)) \ | |
1896 | wake_up(&mdev->misc_wait); \ | |
1897 | ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt); } while (0) | |
1898 | ||
1899 | /* counts how many resync-related answers we still expect from the peer | |
1900 | * increase decrease | |
1901 | * C_SYNC_TARGET sends P_RS_DATA_REQUEST (and expects P_RS_DATA_REPLY) | |
1902 | * C_SYNC_SOURCE sends P_RS_DATA_REPLY (and expects P_WRITE_ACK whith ID_SYNCER) | |
1903 | * (or P_NEG_ACK with ID_SYNCER) | |
1904 | */ | |
1905 | static inline void inc_rs_pending(struct drbd_conf *mdev) | |
1906 | { | |
1907 | atomic_inc(&mdev->rs_pending_cnt); | |
1908 | } | |
1909 | ||
1910 | #define dec_rs_pending(mdev) do { \ | |
1911 | typecheck(struct drbd_conf *, mdev); \ | |
1912 | atomic_dec(&mdev->rs_pending_cnt); \ | |
1913 | ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt); } while (0) | |
1914 | ||
1915 | /* counts how many answers we still need to send to the peer. | |
1916 | * increased on | |
1917 | * receive_Data unless protocol A; | |
1918 | * we need to send a P_RECV_ACK (proto B) | |
1919 | * or P_WRITE_ACK (proto C) | |
1920 | * receive_RSDataReply (recv_resync_read) we need to send a P_WRITE_ACK | |
1921 | * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA | |
1922 | * receive_Barrier_* we need to send a P_BARRIER_ACK | |
1923 | */ | |
1924 | static inline void inc_unacked(struct drbd_conf *mdev) | |
1925 | { | |
1926 | atomic_inc(&mdev->unacked_cnt); | |
1927 | } | |
1928 | ||
1929 | #define dec_unacked(mdev) do { \ | |
1930 | typecheck(struct drbd_conf *, mdev); \ | |
1931 | atomic_dec(&mdev->unacked_cnt); \ | |
1932 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0) | |
1933 | ||
1934 | #define sub_unacked(mdev, n) do { \ | |
1935 | typecheck(struct drbd_conf *, mdev); \ | |
1936 | atomic_sub(n, &mdev->unacked_cnt); \ | |
1937 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0) | |
1938 | ||
1939 | ||
1940 | static inline void put_net_conf(struct drbd_conf *mdev) | |
1941 | { | |
1942 | if (atomic_dec_and_test(&mdev->net_cnt)) | |
1943 | wake_up(&mdev->misc_wait); | |
1944 | } | |
1945 | ||
1946 | /** | |
1947 | * get_net_conf() - Increase ref count on mdev->net_conf; Returns 0 if nothing there | |
1948 | * @mdev: DRBD device. | |
1949 | * | |
1950 | * You have to call put_net_conf() when finished working with mdev->net_conf. | |
1951 | */ | |
1952 | static inline int get_net_conf(struct drbd_conf *mdev) | |
1953 | { | |
1954 | int have_net_conf; | |
1955 | ||
1956 | atomic_inc(&mdev->net_cnt); | |
1957 | have_net_conf = mdev->state.conn >= C_UNCONNECTED; | |
1958 | if (!have_net_conf) | |
1959 | put_net_conf(mdev); | |
1960 | return have_net_conf; | |
1961 | } | |
1962 | ||
1963 | /** | |
1964 | * get_ldev() - Increase the ref count on mdev->ldev. Returns 0 if there is no ldev | |
1965 | * @M: DRBD device. | |
1966 | * | |
1967 | * You have to call put_ldev() when finished working with mdev->ldev. | |
1968 | */ | |
1969 | #define get_ldev(M) __cond_lock(local, _get_ldev_if_state(M,D_INCONSISTENT)) | |
1970 | #define get_ldev_if_state(M,MINS) __cond_lock(local, _get_ldev_if_state(M,MINS)) | |
1971 | ||
1972 | static inline void put_ldev(struct drbd_conf *mdev) | |
1973 | { | |
1974 | __release(local); | |
1975 | if (atomic_dec_and_test(&mdev->local_cnt)) | |
1976 | wake_up(&mdev->misc_wait); | |
1977 | D_ASSERT(atomic_read(&mdev->local_cnt) >= 0); | |
1978 | } | |
1979 | ||
1980 | #ifndef __CHECKER__ | |
1981 | static inline int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) | |
1982 | { | |
1983 | int io_allowed; | |
1984 | ||
1985 | atomic_inc(&mdev->local_cnt); | |
1986 | io_allowed = (mdev->state.disk >= mins); | |
1987 | if (!io_allowed) | |
1988 | put_ldev(mdev); | |
1989 | return io_allowed; | |
1990 | } | |
1991 | #else | |
1992 | extern int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins); | |
1993 | #endif | |
1994 | ||
1995 | /* you must have an "get_ldev" reference */ | |
1996 | static inline void drbd_get_syncer_progress(struct drbd_conf *mdev, | |
1997 | unsigned long *bits_left, unsigned int *per_mil_done) | |
1998 | { | |
1999 | /* | |
2000 | * this is to break it at compile time when we change that | |
2001 | * (we may feel 4TB maximum storage per drbd is not enough) | |
2002 | */ | |
2003 | typecheck(unsigned long, mdev->rs_total); | |
2004 | ||
2005 | /* note: both rs_total and rs_left are in bits, i.e. in | |
2006 | * units of BM_BLOCK_SIZE. | |
2007 | * for the percentage, we don't care. */ | |
2008 | ||
2009 | *bits_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; | |
2010 | /* >> 10 to prevent overflow, | |
2011 | * +1 to prevent division by zero */ | |
2012 | if (*bits_left > mdev->rs_total) { | |
2013 | /* doh. maybe a logic bug somewhere. | |
2014 | * may also be just a race condition | |
2015 | * between this and a disconnect during sync. | |
2016 | * for now, just prevent in-kernel buffer overflow. | |
2017 | */ | |
2018 | smp_rmb(); | |
2019 | dev_warn(DEV, "cs:%s rs_left=%lu > rs_total=%lu (rs_failed %lu)\n", | |
2020 | drbd_conn_str(mdev->state.conn), | |
2021 | *bits_left, mdev->rs_total, mdev->rs_failed); | |
2022 | *per_mil_done = 0; | |
2023 | } else { | |
2024 | /* make sure the calculation happens in long context */ | |
2025 | unsigned long tmp = 1000UL - | |
2026 | (*bits_left >> 10)*1000UL | |
2027 | / ((mdev->rs_total >> 10) + 1UL); | |
2028 | *per_mil_done = tmp; | |
2029 | } | |
2030 | } | |
2031 | ||
2032 | ||
2033 | /* this throttles on-the-fly application requests | |
2034 | * according to max_buffers settings; | |
2035 | * maybe re-implement using semaphores? */ | |
2036 | static inline int drbd_get_max_buffers(struct drbd_conf *mdev) | |
2037 | { | |
2038 | int mxb = 1000000; /* arbitrary limit on open requests */ | |
2039 | if (get_net_conf(mdev)) { | |
2040 | mxb = mdev->net_conf->max_buffers; | |
2041 | put_net_conf(mdev); | |
2042 | } | |
2043 | return mxb; | |
2044 | } | |
2045 | ||
2046 | static inline int drbd_state_is_stable(union drbd_state s) | |
2047 | { | |
2048 | ||
2049 | /* DO NOT add a default clause, we want the compiler to warn us | |
2050 | * for any newly introduced state we may have forgotten to add here */ | |
2051 | ||
2052 | switch ((enum drbd_conns)s.conn) { | |
2053 | /* new io only accepted when there is no connection, ... */ | |
2054 | case C_STANDALONE: | |
2055 | case C_WF_CONNECTION: | |
2056 | /* ... or there is a well established connection. */ | |
2057 | case C_CONNECTED: | |
2058 | case C_SYNC_SOURCE: | |
2059 | case C_SYNC_TARGET: | |
2060 | case C_VERIFY_S: | |
2061 | case C_VERIFY_T: | |
2062 | case C_PAUSED_SYNC_S: | |
2063 | case C_PAUSED_SYNC_T: | |
2064 | /* maybe stable, look at the disk state */ | |
2065 | break; | |
2066 | ||
2067 | /* no new io accepted during tansitional states | |
2068 | * like handshake or teardown */ | |
2069 | case C_DISCONNECTING: | |
2070 | case C_UNCONNECTED: | |
2071 | case C_TIMEOUT: | |
2072 | case C_BROKEN_PIPE: | |
2073 | case C_NETWORK_FAILURE: | |
2074 | case C_PROTOCOL_ERROR: | |
2075 | case C_TEAR_DOWN: | |
2076 | case C_WF_REPORT_PARAMS: | |
2077 | case C_STARTING_SYNC_S: | |
2078 | case C_STARTING_SYNC_T: | |
2079 | case C_WF_BITMAP_S: | |
2080 | case C_WF_BITMAP_T: | |
2081 | case C_WF_SYNC_UUID: | |
2082 | case C_MASK: | |
2083 | /* not "stable" */ | |
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | switch ((enum drbd_disk_state)s.disk) { | |
2088 | case D_DISKLESS: | |
2089 | case D_INCONSISTENT: | |
2090 | case D_OUTDATED: | |
2091 | case D_CONSISTENT: | |
2092 | case D_UP_TO_DATE: | |
2093 | /* disk state is stable as well. */ | |
2094 | break; | |
2095 | ||
2096 | /* no new io accepted during tansitional states */ | |
2097 | case D_ATTACHING: | |
2098 | case D_FAILED: | |
2099 | case D_NEGOTIATING: | |
2100 | case D_UNKNOWN: | |
2101 | case D_MASK: | |
2102 | /* not "stable" */ | |
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | return 1; | |
2107 | } | |
2108 | ||
2109 | static inline int __inc_ap_bio_cond(struct drbd_conf *mdev) | |
2110 | { | |
2111 | int mxb = drbd_get_max_buffers(mdev); | |
2112 | ||
2113 | if (mdev->state.susp) | |
2114 | return 0; | |
2115 | if (test_bit(SUSPEND_IO, &mdev->flags)) | |
2116 | return 0; | |
2117 | ||
2118 | /* to avoid potential deadlock or bitmap corruption, | |
2119 | * in various places, we only allow new application io | |
2120 | * to start during "stable" states. */ | |
2121 | ||
2122 | /* no new io accepted when attaching or detaching the disk */ | |
2123 | if (!drbd_state_is_stable(mdev->state)) | |
2124 | return 0; | |
2125 | ||
2126 | /* since some older kernels don't have atomic_add_unless, | |
2127 | * and we are within the spinlock anyways, we have this workaround. */ | |
2128 | if (atomic_read(&mdev->ap_bio_cnt) > mxb) | |
2129 | return 0; | |
2130 | if (test_bit(BITMAP_IO, &mdev->flags)) | |
2131 | return 0; | |
2132 | return 1; | |
2133 | } | |
2134 | ||
2135 | /* I'd like to use wait_event_lock_irq, | |
2136 | * but I'm not sure when it got introduced, | |
2137 | * and not sure when it has 3 or 4 arguments */ | |
2138 | static inline void inc_ap_bio(struct drbd_conf *mdev, int one_or_two) | |
2139 | { | |
2140 | /* compare with after_state_ch, | |
2141 | * os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S */ | |
2142 | DEFINE_WAIT(wait); | |
2143 | ||
2144 | /* we wait here | |
2145 | * as long as the device is suspended | |
2146 | * until the bitmap is no longer on the fly during connection | |
2147 | * handshake as long as we would exeed the max_buffer limit. | |
2148 | * | |
2149 | * to avoid races with the reconnect code, | |
2150 | * we need to atomic_inc within the spinlock. */ | |
2151 | ||
2152 | spin_lock_irq(&mdev->req_lock); | |
2153 | while (!__inc_ap_bio_cond(mdev)) { | |
2154 | prepare_to_wait(&mdev->misc_wait, &wait, TASK_UNINTERRUPTIBLE); | |
2155 | spin_unlock_irq(&mdev->req_lock); | |
2156 | schedule(); | |
2157 | finish_wait(&mdev->misc_wait, &wait); | |
2158 | spin_lock_irq(&mdev->req_lock); | |
2159 | } | |
2160 | atomic_add(one_or_two, &mdev->ap_bio_cnt); | |
2161 | spin_unlock_irq(&mdev->req_lock); | |
2162 | } | |
2163 | ||
2164 | static inline void dec_ap_bio(struct drbd_conf *mdev) | |
2165 | { | |
2166 | int mxb = drbd_get_max_buffers(mdev); | |
2167 | int ap_bio = atomic_dec_return(&mdev->ap_bio_cnt); | |
2168 | ||
2169 | D_ASSERT(ap_bio >= 0); | |
2170 | /* this currently does wake_up for every dec_ap_bio! | |
2171 | * maybe rather introduce some type of hysteresis? | |
2172 | * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ | |
2173 | if (ap_bio < mxb) | |
2174 | wake_up(&mdev->misc_wait); | |
2175 | if (ap_bio == 0 && test_bit(BITMAP_IO, &mdev->flags)) { | |
2176 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) | |
2177 | drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); | |
2178 | } | |
2179 | } | |
2180 | ||
2181 | static inline void drbd_set_ed_uuid(struct drbd_conf *mdev, u64 val) | |
2182 | { | |
2183 | mdev->ed_uuid = val; | |
2184 | } | |
2185 | ||
2186 | static inline int seq_cmp(u32 a, u32 b) | |
2187 | { | |
2188 | /* we assume wrap around at 32bit. | |
2189 | * for wrap around at 24bit (old atomic_t), | |
2190 | * we'd have to | |
2191 | * a <<= 8; b <<= 8; | |
2192 | */ | |
2193 | return (s32)(a) - (s32)(b); | |
2194 | } | |
2195 | #define seq_lt(a, b) (seq_cmp((a), (b)) < 0) | |
2196 | #define seq_gt(a, b) (seq_cmp((a), (b)) > 0) | |
2197 | #define seq_ge(a, b) (seq_cmp((a), (b)) >= 0) | |
2198 | #define seq_le(a, b) (seq_cmp((a), (b)) <= 0) | |
2199 | /* CAUTION: please no side effects in arguments! */ | |
2200 | #define seq_max(a, b) ((u32)(seq_gt((a), (b)) ? (a) : (b))) | |
2201 | ||
2202 | static inline void update_peer_seq(struct drbd_conf *mdev, unsigned int new_seq) | |
2203 | { | |
2204 | unsigned int m; | |
2205 | spin_lock(&mdev->peer_seq_lock); | |
2206 | m = seq_max(mdev->peer_seq, new_seq); | |
2207 | mdev->peer_seq = m; | |
2208 | spin_unlock(&mdev->peer_seq_lock); | |
2209 | if (m == new_seq) | |
2210 | wake_up(&mdev->seq_wait); | |
2211 | } | |
2212 | ||
2213 | static inline void drbd_update_congested(struct drbd_conf *mdev) | |
2214 | { | |
2215 | struct sock *sk = mdev->data.socket->sk; | |
2216 | if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) | |
2217 | set_bit(NET_CONGESTED, &mdev->flags); | |
2218 | } | |
2219 | ||
2220 | static inline int drbd_queue_order_type(struct drbd_conf *mdev) | |
2221 | { | |
2222 | /* sorry, we currently have no working implementation | |
2223 | * of distributed TCQ stuff */ | |
2224 | #ifndef QUEUE_ORDERED_NONE | |
2225 | #define QUEUE_ORDERED_NONE 0 | |
2226 | #endif | |
2227 | return QUEUE_ORDERED_NONE; | |
2228 | } | |
2229 | ||
2230 | static inline void drbd_blk_run_queue(struct request_queue *q) | |
2231 | { | |
2232 | if (q && q->unplug_fn) | |
2233 | q->unplug_fn(q); | |
2234 | } | |
2235 | ||
2236 | static inline void drbd_kick_lo(struct drbd_conf *mdev) | |
2237 | { | |
2238 | if (get_ldev(mdev)) { | |
2239 | drbd_blk_run_queue(bdev_get_queue(mdev->ldev->backing_bdev)); | |
2240 | put_ldev(mdev); | |
2241 | } | |
2242 | } | |
2243 | ||
2244 | static inline void drbd_md_flush(struct drbd_conf *mdev) | |
2245 | { | |
2246 | int r; | |
2247 | ||
2248 | if (test_bit(MD_NO_BARRIER, &mdev->flags)) | |
2249 | return; | |
2250 | ||
2251 | r = blkdev_issue_flush(mdev->ldev->md_bdev, NULL); | |
2252 | if (r) { | |
2253 | set_bit(MD_NO_BARRIER, &mdev->flags); | |
2254 | dev_err(DEV, "meta data flush failed with status %d, disabling md-flushes\n", r); | |
2255 | } | |
2256 | } | |
2257 | ||
2258 | #endif |