Commit | Line | Data |
---|---|---|
b411b363 PR |
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> | |
b411b363 PR |
31 | #include <linux/list.h> |
32 | #include <linux/sched.h> | |
33 | #include <linux/bitops.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/crypto.h> | |
132cc538 | 36 | #include <linux/ratelimit.h> |
b411b363 PR |
37 | #include <linux/tcp.h> |
38 | #include <linux/mutex.h> | |
39 | #include <linux/major.h> | |
40 | #include <linux/blkdev.h> | |
66114cad | 41 | #include <linux/backing-dev.h> |
b411b363 | 42 | #include <linux/genhd.h> |
062e879c | 43 | #include <linux/idr.h> |
b411b363 PR |
44 | #include <net/tcp.h> |
45 | #include <linux/lru_cache.h> | |
70c71606 | 46 | #include <linux/prefetch.h> |
3b98c0c2 | 47 | #include <linux/drbd_genl_api.h> |
b8907339 | 48 | #include <linux/drbd.h> |
d9f65229 | 49 | #include "drbd_strings.h" |
b8907339 | 50 | #include "drbd_state.h" |
a3603a6e | 51 | #include "drbd_protocol.h" |
b411b363 PR |
52 | |
53 | #ifdef __CHECKER__ | |
54 | # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr"))) | |
55 | # define __protected_read_by(x) __attribute__((require_context(x,1,999,"read"))) | |
56 | # define __protected_write_by(x) __attribute__((require_context(x,1,999,"write"))) | |
57 | # define __must_hold(x) __attribute__((context(x,1,1), require_context(x,1,999,"call"))) | |
58 | #else | |
59 | # define __protected_by(x) | |
60 | # define __protected_read_by(x) | |
61 | # define __protected_write_by(x) | |
62 | # define __must_hold(x) | |
63 | #endif | |
64 | ||
b411b363 PR |
65 | /* module parameter, defined in drbd_main.c */ |
66 | extern unsigned int minor_count; | |
90ab5ee9 RR |
67 | extern bool disable_sendpage; |
68 | extern bool allow_oos; | |
b30ab791 | 69 | void tl_abort_disk_io(struct drbd_device *device); |
b411b363 PR |
70 | |
71 | #ifdef CONFIG_DRBD_FAULT_INJECTION | |
72 | extern int enable_faults; | |
73 | extern int fault_rate; | |
74 | extern int fault_devs; | |
75 | #endif | |
76 | ||
77 | extern char usermode_helper[]; | |
78 | ||
79 | ||
b411b363 PR |
80 | /* This is used to stop/restart our threads. |
81 | * Cannot use SIGTERM nor SIGKILL, since these | |
82 | * are sent out by init on runlevel changes | |
83 | * I choose SIGHUP for now. | |
84 | */ | |
85 | #define DRBD_SIGKILL SIGHUP | |
86 | ||
b411b363 PR |
87 | #define ID_IN_SYNC (4711ULL) |
88 | #define ID_OUT_OF_SYNC (4712ULL) | |
b411b363 | 89 | #define ID_SYNCER (-1ULL) |
579b57ed | 90 | |
4a23f264 | 91 | #define UUID_NEW_BM_OFFSET ((u64)0x0001000000000000ULL) |
b411b363 | 92 | |
54761697 | 93 | struct drbd_device; |
bde89a9e | 94 | struct drbd_connection; |
b411b363 | 95 | |
3b52beff AG |
96 | #define __drbd_printk_device(level, device, fmt, args...) \ |
97 | dev_printk(level, disk_to_dev((device)->vdisk), fmt, ## args) | |
98 | #define __drbd_printk_peer_device(level, peer_device, fmt, args...) \ | |
99 | dev_printk(level, disk_to_dev((peer_device)->device->vdisk), fmt, ## args) | |
100 | #define __drbd_printk_resource(level, resource, fmt, args...) \ | |
101 | printk(level "drbd %s: " fmt, (resource)->name, ## args) | |
102 | #define __drbd_printk_connection(level, connection, fmt, args...) \ | |
103 | printk(level "drbd %s: " fmt, (connection)->resource->name, ## args) | |
104 | ||
105 | void drbd_printk_with_wrong_object_type(void); | |
106 | ||
107 | #define __drbd_printk_if_same_type(obj, type, func, level, fmt, args...) \ | |
108 | (__builtin_types_compatible_p(typeof(obj), type) || \ | |
109 | __builtin_types_compatible_p(typeof(obj), const type)), \ | |
110 | func(level, (const type)(obj), fmt, ## args) | |
111 | ||
112 | #define drbd_printk(level, obj, fmt, args...) \ | |
113 | __builtin_choose_expr( \ | |
114 | __drbd_printk_if_same_type(obj, struct drbd_device *, \ | |
115 | __drbd_printk_device, level, fmt, ## args), \ | |
116 | __builtin_choose_expr( \ | |
117 | __drbd_printk_if_same_type(obj, struct drbd_resource *, \ | |
118 | __drbd_printk_resource, level, fmt, ## args), \ | |
119 | __builtin_choose_expr( \ | |
120 | __drbd_printk_if_same_type(obj, struct drbd_connection *, \ | |
121 | __drbd_printk_connection, level, fmt, ## args), \ | |
122 | __builtin_choose_expr( \ | |
123 | __drbd_printk_if_same_type(obj, struct drbd_peer_device *, \ | |
124 | __drbd_printk_peer_device, level, fmt, ## args), \ | |
125 | drbd_printk_with_wrong_object_type())))) | |
126 | ||
127 | #define drbd_dbg(obj, fmt, args...) \ | |
128 | drbd_printk(KERN_DEBUG, obj, fmt, ## args) | |
129 | #define drbd_alert(obj, fmt, args...) \ | |
130 | drbd_printk(KERN_ALERT, obj, fmt, ## args) | |
131 | #define drbd_err(obj, fmt, args...) \ | |
132 | drbd_printk(KERN_ERR, obj, fmt, ## args) | |
133 | #define drbd_warn(obj, fmt, args...) \ | |
134 | drbd_printk(KERN_WARNING, obj, fmt, ## args) | |
135 | #define drbd_info(obj, fmt, args...) \ | |
136 | drbd_printk(KERN_INFO, obj, fmt, ## args) | |
137 | #define drbd_emerg(obj, fmt, args...) \ | |
138 | drbd_printk(KERN_EMERG, obj, fmt, ## args) | |
d0180171 AG |
139 | |
140 | #define dynamic_drbd_dbg(device, fmt, args...) \ | |
141 | dynamic_dev_dbg(disk_to_dev(device->vdisk), fmt, ## args) | |
b411b363 | 142 | |
0b0ba1ef AG |
143 | #define D_ASSERT(device, exp) do { \ |
144 | if (!(exp)) \ | |
145 | drbd_err(device, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__); \ | |
146 | } while (0) | |
b411b363 | 147 | |
841ce241 AG |
148 | /** |
149 | * expect - Make an assertion | |
150 | * | |
151 | * Unlike the assert macro, this macro returns a boolean result. | |
152 | */ | |
153 | #define expect(exp) ({ \ | |
154 | bool _bool = (exp); \ | |
155 | if (!_bool) \ | |
d0180171 | 156 | drbd_err(device, "ASSERTION %s FAILED in %s\n", \ |
841ce241 AG |
157 | #exp, __func__); \ |
158 | _bool; \ | |
159 | }) | |
b411b363 PR |
160 | |
161 | /* Defines to control fault insertion */ | |
162 | enum { | |
163 | DRBD_FAULT_MD_WR = 0, /* meta data write */ | |
164 | DRBD_FAULT_MD_RD = 1, /* read */ | |
165 | DRBD_FAULT_RS_WR = 2, /* resync */ | |
166 | DRBD_FAULT_RS_RD = 3, | |
167 | DRBD_FAULT_DT_WR = 4, /* data */ | |
168 | DRBD_FAULT_DT_RD = 5, | |
169 | DRBD_FAULT_DT_RA = 6, /* data read ahead */ | |
170 | DRBD_FAULT_BM_ALLOC = 7, /* bitmap allocation */ | |
171 | DRBD_FAULT_AL_EE = 8, /* alloc ee */ | |
6b4388ac | 172 | DRBD_FAULT_RECEIVE = 9, /* Changes some bytes upon receiving a [rs]data block */ |
b411b363 PR |
173 | |
174 | DRBD_FAULT_MAX, | |
175 | }; | |
176 | ||
b411b363 | 177 | extern unsigned int |
b30ab791 | 178 | _drbd_insert_fault(struct drbd_device *device, unsigned int type); |
0cf9d27e | 179 | |
b411b363 | 180 | static inline int |
b30ab791 | 181 | drbd_insert_fault(struct drbd_device *device, unsigned int type) { |
0cf9d27e | 182 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
b411b363 PR |
183 | return fault_rate && |
184 | (enable_faults & (1<<type)) && | |
b30ab791 | 185 | _drbd_insert_fault(device, type); |
b411b363 | 186 | #else |
0cf9d27e | 187 | return 0; |
b411b363 | 188 | #endif |
0cf9d27e | 189 | } |
b411b363 PR |
190 | |
191 | /* integer division, round _UP_ to the next integer */ | |
192 | #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0)) | |
193 | /* usual integer division */ | |
194 | #define div_floor(A, B) ((A)/(B)) | |
195 | ||
b411b363 | 196 | extern struct ratelimit_state drbd_ratelimit_state; |
05a10ec7 | 197 | extern struct idr drbd_devices; /* RCU, updates: genl_lock() */ |
77c556f6 | 198 | extern struct list_head drbd_resources; /* RCU, updates: genl_lock() */ |
b411b363 | 199 | |
d8763023 | 200 | extern const char *cmdname(enum drbd_packet cmd); |
b411b363 PR |
201 | |
202 | /* for sending/receiving the bitmap, | |
203 | * possibly in some encoding scheme */ | |
204 | struct bm_xfer_ctx { | |
205 | /* "const" | |
206 | * stores total bits and long words | |
207 | * of the bitmap, so we don't need to | |
208 | * call the accessor functions over and again. */ | |
209 | unsigned long bm_bits; | |
210 | unsigned long bm_words; | |
211 | /* during xfer, current position within the bitmap */ | |
212 | unsigned long bit_offset; | |
213 | unsigned long word_offset; | |
214 | ||
215 | /* statistics; index: (h->command == P_BITMAP) */ | |
216 | unsigned packets[2]; | |
217 | unsigned bytes[2]; | |
218 | }; | |
219 | ||
b30ab791 | 220 | extern void INFO_bm_xfer_stats(struct drbd_device *device, |
b411b363 PR |
221 | const char *direction, struct bm_xfer_ctx *c); |
222 | ||
223 | static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) | |
224 | { | |
225 | /* word_offset counts "native long words" (32 or 64 bit), | |
226 | * aligned at 64 bit. | |
227 | * Encoded packet may end at an unaligned bit offset. | |
228 | * In case a fallback clear text packet is transmitted in | |
229 | * between, we adjust this offset back to the last 64bit | |
230 | * aligned "native long word", which makes coding and decoding | |
231 | * the plain text bitmap much more convenient. */ | |
232 | #if BITS_PER_LONG == 64 | |
233 | c->word_offset = c->bit_offset >> 6; | |
234 | #elif BITS_PER_LONG == 32 | |
235 | c->word_offset = c->bit_offset >> 5; | |
236 | c->word_offset &= ~(1UL); | |
237 | #else | |
238 | # error "unsupported BITS_PER_LONG" | |
239 | #endif | |
240 | } | |
241 | ||
bde89a9e | 242 | extern unsigned int drbd_header_size(struct drbd_connection *connection); |
b411b363 | 243 | |
b411b363 PR |
244 | /**********************************************************************/ |
245 | enum drbd_thread_state { | |
e77a0a5c AG |
246 | NONE, |
247 | RUNNING, | |
248 | EXITING, | |
249 | RESTARTING | |
b411b363 PR |
250 | }; |
251 | ||
252 | struct drbd_thread { | |
253 | spinlock_t t_lock; | |
254 | struct task_struct *task; | |
255 | struct completion stop; | |
256 | enum drbd_thread_state t_state; | |
257 | int (*function) (struct drbd_thread *); | |
2457b6d5 | 258 | struct drbd_resource *resource; |
bde89a9e | 259 | struct drbd_connection *connection; |
b411b363 | 260 | int reset_cpu_mask; |
c60b0251 | 261 | const char *name; |
b411b363 PR |
262 | }; |
263 | ||
264 | static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) | |
265 | { | |
266 | /* THINK testing the t_state seems to be uncritical in all cases | |
267 | * (but thread_{start,stop}), so we can read it *without* the lock. | |
268 | * --lge */ | |
269 | ||
270 | smp_rmb(); | |
271 | return thi->t_state; | |
272 | } | |
273 | ||
b411b363 PR |
274 | struct drbd_work { |
275 | struct list_head list; | |
309a8348 | 276 | int (*cb)(struct drbd_work *, int cancel); |
84b8c06b AG |
277 | }; |
278 | ||
279 | struct drbd_device_work { | |
280 | struct drbd_work w; | |
281 | struct drbd_device *device; | |
b411b363 PR |
282 | }; |
283 | ||
ace652ac AG |
284 | #include "drbd_interval.h" |
285 | ||
54761697 | 286 | extern int drbd_wait_misc(struct drbd_device *, struct drbd_interval *); |
7be8da07 | 287 | |
28bc3b8c AG |
288 | extern void lock_all_resources(void); |
289 | extern void unlock_all_resources(void); | |
290 | ||
b411b363 PR |
291 | struct drbd_request { |
292 | struct drbd_work w; | |
84b8c06b | 293 | struct drbd_device *device; |
b411b363 PR |
294 | |
295 | /* if local IO is not allowed, will be NULL. | |
296 | * if local IO _is_ allowed, holds the locally submitted bio clone, | |
297 | * or, after local IO completion, the ERR_PTR(error). | |
fcefa62e | 298 | * see drbd_request_endio(). */ |
b411b363 PR |
299 | struct bio *private_bio; |
300 | ||
ace652ac | 301 | struct drbd_interval i; |
b411b363 | 302 | |
b6dd1a89 | 303 | /* epoch: used to check on "completion" whether this req was in |
b411b363 | 304 | * the current epoch, and we therefore have to close it, |
b6dd1a89 LE |
305 | * causing a p_barrier packet to be send, starting a new epoch. |
306 | * | |
307 | * This corresponds to "barrier" in struct p_barrier[_ack], | |
308 | * and to "barrier_nr" in struct drbd_epoch (and various | |
309 | * comments/function parameters/local variable names). | |
b411b363 | 310 | */ |
b6dd1a89 | 311 | unsigned int epoch; |
b411b363 | 312 | |
b411b363 PR |
313 | struct list_head tl_requests; /* ring list in the transfer log */ |
314 | struct bio *master_bio; /* master bio pointer */ | |
e5f891b2 | 315 | |
844a6ae7 LE |
316 | /* see struct drbd_device */ |
317 | struct list_head req_pending_master_completion; | |
318 | struct list_head req_pending_local; | |
319 | ||
e5f891b2 LE |
320 | /* for generic IO accounting */ |
321 | unsigned long start_jif; | |
322 | ||
323 | /* for DRBD internal statistics */ | |
324 | ||
325 | /* Minimal set of time stamps to determine if we wait for activity log | |
326 | * transactions, local disk or peer. 32 bit "jiffies" are good enough, | |
327 | * we don't expect a DRBD request to be stalled for several month. | |
328 | */ | |
329 | ||
330 | /* before actual request processing */ | |
331 | unsigned long in_actlog_jif; | |
332 | ||
333 | /* local disk */ | |
334 | unsigned long pre_submit_jif; | |
335 | ||
336 | /* per connection */ | |
337 | unsigned long pre_send_jif; | |
338 | unsigned long acked_jif; | |
339 | unsigned long net_done_jif; | |
340 | ||
341 | /* Possibly even more detail to track each phase: | |
342 | * master_completion_jif | |
343 | * how long did it take to complete the master bio | |
344 | * (application visible latency) | |
345 | * allocated_jif | |
346 | * how long the master bio was blocked until we finally allocated | |
347 | * a tracking struct | |
348 | * in_actlog_jif | |
349 | * how long did we wait for activity log transactions | |
350 | * | |
351 | * net_queued_jif | |
352 | * when did we finally queue it for sending | |
353 | * pre_send_jif | |
354 | * when did we start sending it | |
355 | * post_send_jif | |
356 | * how long did we block in the network stack trying to send it | |
357 | * acked_jif | |
358 | * when did we receive (or fake, in protocol A) a remote ACK | |
359 | * net_done_jif | |
360 | * when did we receive final acknowledgement (P_BARRIER_ACK), | |
361 | * or decide, e.g. on connection loss, that we do no longer expect | |
362 | * anything from this peer for this request. | |
363 | * | |
364 | * pre_submit_jif | |
365 | * post_sub_jif | |
366 | * when did we start submiting to the lower level device, | |
367 | * and how long did we block in that submit function | |
368 | * local_completion_jif | |
369 | * how long did it take the lower level device to complete this request | |
370 | */ | |
371 | ||
b411b363 | 372 | |
b406777e LE |
373 | /* once it hits 0, we may complete the master_bio */ |
374 | atomic_t completion_ref; | |
375 | /* once it hits 0, we may destroy this drbd_request object */ | |
376 | struct kref kref; | |
b411b363 | 377 | |
a0d856df | 378 | unsigned rq_state; /* see comments above _req_mod() */ |
b411b363 | 379 | }; |
b411b363 PR |
380 | |
381 | struct drbd_epoch { | |
bde89a9e | 382 | struct drbd_connection *connection; |
b411b363 PR |
383 | struct list_head list; |
384 | unsigned int barrier_nr; | |
385 | atomic_t epoch_size; /* increased on every request added. */ | |
386 | atomic_t active; /* increased on every req. added, and dec on every finished. */ | |
387 | unsigned long flags; | |
388 | }; | |
389 | ||
de0b2e69 RK |
390 | /* Prototype declaration of function defined in drbd_receiver.c */ |
391 | int drbdd_init(struct drbd_thread *); | |
392 | int drbd_asender(struct drbd_thread *); | |
393 | ||
b411b363 PR |
394 | /* drbd_epoch flag bits */ |
395 | enum { | |
b411b363 | 396 | DE_HAVE_BARRIER_NUMBER, |
b411b363 PR |
397 | }; |
398 | ||
399 | enum epoch_event { | |
400 | EV_PUT, | |
401 | EV_GOT_BARRIER_NR, | |
b411b363 | 402 | EV_BECAME_LAST, |
b411b363 PR |
403 | EV_CLEANUP = 32, /* used as flag */ |
404 | }; | |
405 | ||
b411b363 PR |
406 | struct digest_info { |
407 | int digest_size; | |
408 | void *digest; | |
409 | }; | |
410 | ||
f6ffca9f | 411 | struct drbd_peer_request { |
a8cd15ba AG |
412 | struct drbd_work w; |
413 | struct drbd_peer_device *peer_device; | |
85719573 | 414 | struct drbd_epoch *epoch; /* for writes */ |
45bb912b LE |
415 | struct page *pages; |
416 | atomic_t pending_bios; | |
010f6e67 | 417 | struct drbd_interval i; |
45bb912b LE |
418 | /* see comments on ee flag bits below */ |
419 | unsigned long flags; | |
21ae5d7f | 420 | unsigned long submit_jif; |
85719573 PR |
421 | union { |
422 | u64 block_id; | |
423 | struct digest_info *digest; | |
424 | }; | |
45bb912b LE |
425 | }; |
426 | ||
427 | /* ee flag bits. | |
428 | * While corresponding bios are in flight, the only modification will be | |
429 | * set_bit WAS_ERROR, which has to be atomic. | |
430 | * If no bios are in flight yet, or all have been completed, | |
431 | * non-atomic modification to ee->flags is ok. | |
432 | */ | |
b411b363 PR |
433 | enum { |
434 | __EE_CALL_AL_COMPLETE_IO, | |
b411b363 | 435 | __EE_MAY_SET_IN_SYNC, |
45bb912b | 436 | |
a0fb3c47 LE |
437 | /* is this a TRIM aka REQ_DISCARD? */ |
438 | __EE_IS_TRIM, | |
439 | /* our lower level cannot handle trim, | |
440 | * and we want to fall back to zeroout instead */ | |
441 | __EE_IS_TRIM_USE_ZEROOUT, | |
442 | ||
45bb912b LE |
443 | /* In case a barrier failed, |
444 | * we need to resubmit without the barrier flag. */ | |
445 | __EE_RESUBMITTED, | |
446 | ||
6c852bec | 447 | /* we may have several bios per peer request. |
45bb912b LE |
448 | * if any of those fail, we set this flag atomically |
449 | * from the endio callback */ | |
450 | __EE_WAS_ERROR, | |
c36c3ced LE |
451 | |
452 | /* This ee has a pointer to a digest instead of a block id */ | |
453 | __EE_HAS_DIGEST, | |
7be8da07 AG |
454 | |
455 | /* Conflicting local requests need to be restarted after this request */ | |
456 | __EE_RESTART_REQUESTS, | |
303d1448 PR |
457 | |
458 | /* The peer wants a write ACK for this (wire proto C) */ | |
459 | __EE_SEND_WRITE_ACK, | |
302bdeae PR |
460 | |
461 | /* Is set when net_conf had two_primaries set while creating this peer_req */ | |
462 | __EE_IN_INTERVAL_TREE, | |
21ae5d7f LE |
463 | |
464 | /* for debugfs: */ | |
465 | /* has this been submitted, or does it still wait for something else? */ | |
466 | __EE_SUBMITTED, | |
467 | ||
468 | /* this is/was a write request */ | |
469 | __EE_WRITE, | |
470 | ||
471 | /* this originates from application on peer | |
472 | * (not some resync or verify or other DRBD internal request) */ | |
473 | __EE_APPLICATION, | |
b411b363 PR |
474 | }; |
475 | #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO) | |
b411b363 | 476 | #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC) |
a0fb3c47 LE |
477 | #define EE_IS_TRIM (1<<__EE_IS_TRIM) |
478 | #define EE_IS_TRIM_USE_ZEROOUT (1<<__EE_IS_TRIM_USE_ZEROOUT) | |
479 | #define EE_RESUBMITTED (1<<__EE_RESUBMITTED) | |
45bb912b | 480 | #define EE_WAS_ERROR (1<<__EE_WAS_ERROR) |
c36c3ced | 481 | #define EE_HAS_DIGEST (1<<__EE_HAS_DIGEST) |
7be8da07 | 482 | #define EE_RESTART_REQUESTS (1<<__EE_RESTART_REQUESTS) |
303d1448 | 483 | #define EE_SEND_WRITE_ACK (1<<__EE_SEND_WRITE_ACK) |
302bdeae | 484 | #define EE_IN_INTERVAL_TREE (1<<__EE_IN_INTERVAL_TREE) |
21ae5d7f LE |
485 | #define EE_SUBMITTED (1<<__EE_SUBMITTED) |
486 | #define EE_WRITE (1<<__EE_WRITE) | |
487 | #define EE_APPLICATION (1<<__EE_APPLICATION) | |
b411b363 | 488 | |
b30ab791 | 489 | /* flag bits per device */ |
b411b363 | 490 | enum { |
b411b363 PR |
491 | UNPLUG_REMOTE, /* sending a "UnplugRemote" could help */ |
492 | MD_DIRTY, /* current uuids and flags not yet on disk */ | |
b411b363 | 493 | USE_DEGR_WFC_T, /* degr-wfc-timeout instead of wfc-timeout. */ |
b411b363 PR |
494 | CL_ST_CHG_SUCCESS, |
495 | CL_ST_CHG_FAIL, | |
496 | CRASHED_PRIMARY, /* This node was a crashed primary. | |
497 | * Gets cleared when the state.conn | |
498 | * goes into C_CONNECTED state. */ | |
b411b363 PR |
499 | CONSIDER_RESYNC, |
500 | ||
a8a4e51e | 501 | MD_NO_FUA, /* Users wants us to not use FUA/FLUSH on meta data dev */ |
5ab7d2c0 | 502 | |
b411b363 PR |
503 | BITMAP_IO, /* suspend application io; |
504 | once no more io in flight, start bitmap io */ | |
505 | BITMAP_IO_QUEUED, /* Started bitmap IO */ | |
a2a3c74f LE |
506 | WAS_IO_ERROR, /* Local disk failed, returned IO error */ |
507 | WAS_READ_ERROR, /* Local disk READ failed (set additionally to the above) */ | |
383606e0 | 508 | FORCE_DETACH, /* Force-detach from local disk, aborting any pending local IO */ |
b411b363 | 509 | RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */ |
b411b363 PR |
510 | RESIZE_PENDING, /* Size change detected locally, waiting for the response from |
511 | * the peer, if it changed there as well. */ | |
43a5182c | 512 | NEW_CUR_UUID, /* Create new current UUID when thawing IO */ |
0778286a | 513 | AL_SUSPENDED, /* Activity logging is currently suspended. */ |
370a43e7 | 514 | AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */ |
e64a3294 | 515 | B_RS_H_DONE, /* Before resync handler done (already executed) */ |
08b165ba | 516 | DISCARD_MY_DATA, /* discard_my_data flag per volume */ |
380207d0 | 517 | READ_BALANCE_RR, |
e334f550 | 518 | |
f418815f LE |
519 | FLUSH_PENDING, /* if set, device->flush_jif is when we submitted that flush |
520 | * from drbd_flush_after_epoch() */ | |
521 | ||
e334f550 LE |
522 | /* cleared only after backing device related structures have been destroyed. */ |
523 | GOING_DISKLESS, /* Disk is being detached, because of io-error, or admin request. */ | |
524 | ||
525 | /* to be used in drbd_device_post_work() */ | |
526 | GO_DISKLESS, /* tell worker to schedule cleanup before detach */ | |
527 | DESTROY_DISK, /* tell worker to close backing devices and destroy related structures. */ | |
ac0acb9e LE |
528 | MD_SYNC, /* tell worker to call drbd_md_sync() */ |
529 | RS_START, /* tell worker to start resync/OV */ | |
e334f550 LE |
530 | RS_PROGRESS, /* tell worker that resync made significant progress */ |
531 | RS_DONE, /* tell worker that resync is done */ | |
b411b363 PR |
532 | }; |
533 | ||
54761697 | 534 | struct drbd_bitmap; /* opaque for drbd_device */ |
b411b363 | 535 | |
20ceb2b2 LE |
536 | /* definition of bits in bm_flags to be used in drbd_bm_lock |
537 | * and drbd_bitmap_io and friends. */ | |
538 | enum bm_flag { | |
20ceb2b2 | 539 | /* currently locked for bulk operation */ |
0e8488ad | 540 | BM_LOCKED_MASK = 0xf, |
20ceb2b2 LE |
541 | |
542 | /* in detail, that is: */ | |
543 | BM_DONT_CLEAR = 0x1, | |
544 | BM_DONT_SET = 0x2, | |
545 | BM_DONT_TEST = 0x4, | |
546 | ||
0e8488ad LE |
547 | /* so we can mark it locked for bulk operation, |
548 | * and still allow all non-bulk operations */ | |
549 | BM_IS_LOCKED = 0x8, | |
550 | ||
20ceb2b2 | 551 | /* (test bit, count bit) allowed (common case) */ |
0e8488ad | 552 | BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED, |
20ceb2b2 LE |
553 | |
554 | /* testing bits, as well as setting new bits allowed, but clearing bits | |
555 | * would be unexpected. Used during bitmap receive. Setting new bits | |
556 | * requires sending of "out-of-sync" information, though. */ | |
0e8488ad | 557 | BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED, |
20ceb2b2 | 558 | |
0e8488ad LE |
559 | /* for drbd_bm_write_copy_pages, everything is allowed, |
560 | * only concurrent bulk operations are locked out. */ | |
561 | BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED, | |
20ceb2b2 LE |
562 | }; |
563 | ||
b411b363 PR |
564 | struct drbd_work_queue { |
565 | struct list_head q; | |
b411b363 | 566 | spinlock_t q_lock; /* to protect the list. */ |
8c0785a5 | 567 | wait_queue_head_t q_wait; |
b411b363 PR |
568 | }; |
569 | ||
570 | struct drbd_socket { | |
b411b363 PR |
571 | struct mutex mutex; |
572 | struct socket *socket; | |
573 | /* this way we get our | |
574 | * send/receive buffers off the stack */ | |
5a87d920 | 575 | void *sbuf; |
e6ef8a5c | 576 | void *rbuf; |
b411b363 PR |
577 | }; |
578 | ||
579 | struct drbd_md { | |
580 | u64 md_offset; /* sector offset to 'super' block */ | |
581 | ||
582 | u64 la_size_sect; /* last agreed size, unit sectors */ | |
9f2247bb | 583 | spinlock_t uuid_lock; |
b411b363 PR |
584 | u64 uuid[UI_SIZE]; |
585 | u64 device_uuid; | |
586 | u32 flags; | |
587 | u32 md_size_sect; | |
588 | ||
ae8bf312 | 589 | s32 al_offset; /* signed relative sector offset to activity log */ |
b411b363 | 590 | s32 bm_offset; /* signed relative sector offset to bitmap */ |
3a4d4eb3 LE |
591 | |
592 | /* cached value of bdev->disk_conf->meta_dev_idx (see below) */ | |
593 | s32 meta_dev_idx; | |
594 | ||
595 | /* see al_tr_number_to_on_disk_sector() */ | |
596 | u32 al_stripes; | |
597 | u32 al_stripe_size_4k; | |
598 | u32 al_size_4k; /* cached product of the above */ | |
b411b363 PR |
599 | }; |
600 | ||
b411b363 PR |
601 | struct drbd_backing_dev { |
602 | struct block_device *backing_bdev; | |
603 | struct block_device *md_bdev; | |
b411b363 | 604 | struct drbd_md md; |
0500813f | 605 | struct disk_conf *disk_conf; /* RCU, for updates: resource->conf_update */ |
b411b363 PR |
606 | sector_t known_size; /* last known size of that backing device */ |
607 | }; | |
608 | ||
609 | struct drbd_md_io { | |
e37d2438 LE |
610 | struct page *page; |
611 | unsigned long start_jif; /* last call to drbd_md_get_buffer */ | |
612 | unsigned long submit_jif; /* last _drbd_md_sync_page_io() submit */ | |
613 | const char *current_use; | |
614 | atomic_t in_use; | |
0c464425 | 615 | unsigned int done; |
b411b363 PR |
616 | int error; |
617 | }; | |
618 | ||
619 | struct bm_io_work { | |
620 | struct drbd_work w; | |
621 | char *why; | |
20ceb2b2 | 622 | enum bm_flag flags; |
b30ab791 AG |
623 | int (*io_fn)(struct drbd_device *device); |
624 | void (*done)(struct drbd_device *device, int rv); | |
b411b363 PR |
625 | }; |
626 | ||
778f271d | 627 | struct fifo_buffer { |
778f271d PR |
628 | unsigned int head_index; |
629 | unsigned int size; | |
9958c857 PR |
630 | int total; /* sum of all values */ |
631 | int values[0]; | |
778f271d | 632 | }; |
9958c857 | 633 | extern struct fifo_buffer *fifo_alloc(int fifo_size); |
778f271d | 634 | |
bde89a9e | 635 | /* flag bits per connection */ |
01a311a5 PR |
636 | enum { |
637 | NET_CONGESTED, /* The data socket is congested */ | |
427c0434 | 638 | RESOLVE_CONFLICTS, /* Set on one node, cleared on the peer! */ |
668700b4 | 639 | SEND_PING, |
2a67d8b9 | 640 | GOT_PING_ACK, /* set when we receive a ping_ack packet, ping_wait gets woken */ |
4d0fc3fd | 641 | CONN_WD_ST_CHG_REQ, /* A cluster wide state change on the connection is active */ |
fc3b10a4 PR |
642 | CONN_WD_ST_CHG_OKAY, |
643 | CONN_WD_ST_CHG_FAIL, | |
8169e41b | 644 | CONN_DRY_RUN, /* Expect disconnect after resync handshake. */ |
6936fcb4 | 645 | CREATE_BARRIER, /* next P_DATA is preceded by a P_BARRIER */ |
a1096a6e | 646 | STATE_SENT, /* Do not change state/UUIDs while this is set */ |
6f3465ed LE |
647 | CALLBACK_PENDING, /* Whether we have a call_usermodehelper(, UMH_WAIT_PROC) |
648 | * pending, from drbd worker context. | |
649 | * If set, bdi_write_congested() returns true, | |
650 | * so shrink_page_list() would not recurse into, | |
651 | * and potentially deadlock on, this drbd worker. | |
652 | */ | |
b66623e3 | 653 | DISCONNECT_SENT, |
e334f550 LE |
654 | |
655 | DEVICE_WORK_PENDING, /* tell worker that some device has pending work */ | |
01a311a5 PR |
656 | }; |
657 | ||
a2972846 AG |
658 | enum which_state { NOW, OLD = NOW, NEW }; |
659 | ||
77c556f6 AG |
660 | struct drbd_resource { |
661 | char *name; | |
4d3d5aa8 LE |
662 | #ifdef CONFIG_DEBUG_FS |
663 | struct dentry *debugfs_res; | |
664 | struct dentry *debugfs_res_volumes; | |
665 | struct dentry *debugfs_res_connections; | |
666 | struct dentry *debugfs_res_in_flight_summary; | |
667 | #endif | |
77c556f6 | 668 | struct kref kref; |
803ea134 | 669 | struct idr devices; /* volume number to device mapping */ |
77c556f6 AG |
670 | struct list_head connections; |
671 | struct list_head resources; | |
eb6bea67 | 672 | struct res_opts res_opts; |
0500813f | 673 | struct mutex conf_update; /* mutex for ready-copy-update of net_conf and disk_conf */ |
9e276872 | 674 | struct mutex adm_mutex; /* mutex to serialize administrative requests */ |
0500813f | 675 | spinlock_t req_lock; |
6bbf53ca AG |
676 | |
677 | unsigned susp:1; /* IO suspended by user */ | |
678 | unsigned susp_nod:1; /* IO suspended because no data */ | |
679 | unsigned susp_fen:1; /* IO suspended because fence peer handler runs */ | |
625a6ba2 | 680 | |
e9526580 PR |
681 | enum write_ordering_e write_ordering; |
682 | ||
625a6ba2 | 683 | cpumask_var_t cpu_mask; |
77c556f6 AG |
684 | }; |
685 | ||
944410e9 LE |
686 | struct drbd_thread_timing_details |
687 | { | |
688 | unsigned long start_jif; | |
689 | void *cb_addr; | |
690 | const char *caller_fn; | |
691 | unsigned int line; | |
692 | unsigned int cb_nr; | |
693 | }; | |
694 | ||
77c556f6 AG |
695 | struct drbd_connection { |
696 | struct list_head connections; | |
697 | struct drbd_resource *resource; | |
4d3d5aa8 LE |
698 | #ifdef CONFIG_DEBUG_FS |
699 | struct dentry *debugfs_conn; | |
700 | struct dentry *debugfs_conn_callback_history; | |
701 | struct dentry *debugfs_conn_oldest_requests; | |
702 | #endif | |
9dc9fbb3 | 703 | struct kref kref; |
c06ece6b | 704 | struct idr peer_devices; /* volume number to peer device mapping */ |
8410da8f PR |
705 | enum drbd_conns cstate; /* Only C_STANDALONE to C_WF_REPORT_PARAMS */ |
706 | struct mutex cstate_mutex; /* Protects graceful disconnects */ | |
28e448bb | 707 | unsigned int connect_cnt; /* Inc each time a connection is established */ |
2111438b | 708 | |
062e879c | 709 | unsigned long flags; |
44ed167d | 710 | struct net_conf *net_conf; /* content protected by rcu */ |
91fd4dad | 711 | wait_queue_head_t ping_wait; /* Woken upon reception of a ping, and a state change */ |
e42325a5 | 712 | |
089c075d AG |
713 | struct sockaddr_storage my_addr; |
714 | int my_addr_len; | |
715 | struct sockaddr_storage peer_addr; | |
716 | int peer_addr_len; | |
717 | ||
e42325a5 PR |
718 | struct drbd_socket data; /* data/barrier/cstate/parameter packets */ |
719 | struct drbd_socket meta; /* ping/ack (metadata) packets */ | |
31890f4a | 720 | int agreed_pro_version; /* actually used protocol version */ |
20c68fde | 721 | u32 agreed_features; |
31890f4a PR |
722 | unsigned long last_received; /* in jiffies, either socket */ |
723 | unsigned int ko_count; | |
e6b3ea83 | 724 | |
b6dd1a89 | 725 | struct list_head transfer_log; /* all requests not yet fully processed */ |
87eeee41 | 726 | |
a0638456 | 727 | struct crypto_hash *cram_hmac_tfm; |
bde89a9e | 728 | struct crypto_hash *integrity_tfm; /* checksums we compute, updates protected by connection->data->mutex */ |
036b17ea | 729 | struct crypto_hash *peer_integrity_tfm; /* checksums we verify, only accessed from receiver thread */ |
f399002e LE |
730 | struct crypto_hash *csums_tfm; |
731 | struct crypto_hash *verify_tfm; | |
a0638456 PR |
732 | void *int_dig_in; |
733 | void *int_dig_vv; | |
734 | ||
b6dd1a89 | 735 | /* receiver side */ |
12038a3a PR |
736 | struct drbd_epoch *current_epoch; |
737 | spinlock_t epoch_lock; | |
738 | unsigned int epochs; | |
b379c41e | 739 | atomic_t current_tle_nr; /* transfer log epoch number */ |
b6dd1a89 | 740 | unsigned current_tle_writes; /* writes seen within this tl epoch */ |
4b0007c0 | 741 | |
07be15b1 | 742 | unsigned long last_reconnect_jif; |
e6b3ea83 PR |
743 | struct drbd_thread receiver; |
744 | struct drbd_thread worker; | |
1c03e520 | 745 | struct drbd_thread ack_receiver; |
668700b4 | 746 | struct workqueue_struct *ack_sender; |
b6dd1a89 | 747 | |
7753a4c1 LE |
748 | /* cached pointers, |
749 | * so we can look up the oldest pending requests more quickly. | |
750 | * protected by resource->req_lock */ | |
751 | struct drbd_request *req_next; /* DRBD 9: todo.req_next */ | |
752 | struct drbd_request *req_ack_pending; | |
753 | struct drbd_request *req_not_net_done; | |
754 | ||
b6dd1a89 | 755 | /* sender side */ |
d5b27b01 | 756 | struct drbd_work_queue sender_work; |
b6dd1a89 | 757 | |
944410e9 LE |
758 | #define DRBD_THREAD_DETAILS_HIST 16 |
759 | unsigned int w_cb_nr; /* keeps counting up */ | |
760 | unsigned int r_cb_nr; /* keeps counting up */ | |
761 | struct drbd_thread_timing_details w_timing_details[DRBD_THREAD_DETAILS_HIST]; | |
762 | struct drbd_thread_timing_details r_timing_details[DRBD_THREAD_DETAILS_HIST]; | |
763 | ||
b6dd1a89 | 764 | struct { |
84d34f2f LE |
765 | unsigned long last_sent_barrier_jif; |
766 | ||
b6dd1a89 LE |
767 | /* whether this sender thread |
768 | * has processed a single write yet. */ | |
769 | bool seen_any_write_yet; | |
770 | ||
771 | /* Which barrier number to send with the next P_BARRIER */ | |
772 | int current_epoch_nr; | |
773 | ||
774 | /* how many write requests have been sent | |
775 | * with req->epoch == current_epoch_nr. | |
776 | * If none, no P_BARRIER will be sent. */ | |
777 | unsigned current_epoch_writes; | |
778 | } send; | |
778f271d PR |
779 | }; |
780 | ||
a2972846 AG |
781 | static inline bool has_net_conf(struct drbd_connection *connection) |
782 | { | |
783 | bool has_net_conf; | |
784 | ||
785 | rcu_read_lock(); | |
786 | has_net_conf = rcu_dereference(connection->net_conf); | |
787 | rcu_read_unlock(); | |
788 | ||
789 | return has_net_conf; | |
790 | } | |
791 | ||
944410e9 LE |
792 | void __update_timing_details( |
793 | struct drbd_thread_timing_details *tdp, | |
794 | unsigned int *cb_nr, | |
795 | void *cb, | |
796 | const char *fn, const unsigned int line); | |
797 | ||
798 | #define update_worker_timing_details(c, cb) \ | |
799 | __update_timing_details(c->w_timing_details, &c->w_cb_nr, cb, __func__ , __LINE__ ) | |
800 | #define update_receiver_timing_details(c, cb) \ | |
801 | __update_timing_details(c->r_timing_details, &c->r_cb_nr, cb, __func__ , __LINE__ ) | |
802 | ||
113fef9e LE |
803 | struct submit_worker { |
804 | struct workqueue_struct *wq; | |
805 | struct work_struct worker; | |
806 | ||
844a6ae7 | 807 | /* protected by ..->resource->req_lock */ |
113fef9e LE |
808 | struct list_head writes; |
809 | }; | |
810 | ||
a6b32bc3 AG |
811 | struct drbd_peer_device { |
812 | struct list_head peer_devices; | |
813 | struct drbd_device *device; | |
bde89a9e | 814 | struct drbd_connection *connection; |
668700b4 | 815 | struct work_struct send_acks_work; |
4d3d5aa8 LE |
816 | #ifdef CONFIG_DEBUG_FS |
817 | struct dentry *debugfs_peer_dev; | |
818 | #endif | |
a6b32bc3 AG |
819 | }; |
820 | ||
821 | struct drbd_device { | |
d8628a86 | 822 | struct drbd_resource *resource; |
a6b32bc3 | 823 | struct list_head peer_devices; |
4ce49266 | 824 | struct list_head pending_bitmap_io; |
4d3d5aa8 LE |
825 | |
826 | unsigned long flush_jif; | |
827 | #ifdef CONFIG_DEBUG_FS | |
828 | struct dentry *debugfs_minor; | |
829 | struct dentry *debugfs_vol; | |
830 | struct dentry *debugfs_vol_oldest_requests; | |
831 | struct dentry *debugfs_vol_act_log_extents; | |
832 | struct dentry *debugfs_vol_resync_extents; | |
833 | struct dentry *debugfs_vol_data_gen_id; | |
f5ec0173 | 834 | struct dentry *debugfs_vol_ed_gen_id; |
4d3d5aa8 LE |
835 | #endif |
836 | ||
837 | unsigned int vnr; /* volume number within the connection */ | |
838 | unsigned int minor; /* device minor number */ | |
839 | ||
81fa2e67 | 840 | struct kref kref; |
2111438b | 841 | |
b411b363 PR |
842 | /* things that are stored as / read from meta data on disk */ |
843 | unsigned long flags; | |
844 | ||
845 | /* configured by drbdsetup */ | |
b411b363 PR |
846 | struct drbd_backing_dev *ldev __protected_by(local); |
847 | ||
848 | sector_t p_size; /* partner's disk size */ | |
849 | struct request_queue *rq_queue; | |
850 | struct block_device *this_bdev; | |
851 | struct gendisk *vdisk; | |
852 | ||
07be15b1 | 853 | unsigned long last_reattach_jif; |
84b8c06b AG |
854 | struct drbd_work resync_work; |
855 | struct drbd_work unplug_work; | |
b411b363 PR |
856 | struct timer_list resync_timer; |
857 | struct timer_list md_sync_timer; | |
370a43e7 | 858 | struct timer_list start_resync_timer; |
7fde2be9 | 859 | struct timer_list request_timer; |
b411b363 PR |
860 | |
861 | /* Used after attach while negotiating new disk state. */ | |
862 | union drbd_state new_state_tmp; | |
863 | ||
da9fbc27 | 864 | union drbd_dev_state state; |
b411b363 PR |
865 | wait_queue_head_t misc_wait; |
866 | wait_queue_head_t state_wait; /* upon each state change. */ | |
867 | unsigned int send_cnt; | |
868 | unsigned int recv_cnt; | |
869 | unsigned int read_cnt; | |
870 | unsigned int writ_cnt; | |
871 | unsigned int al_writ_cnt; | |
872 | unsigned int bm_writ_cnt; | |
873 | atomic_t ap_bio_cnt; /* Requests we need to complete */ | |
ad3fee79 | 874 | atomic_t ap_actlog_cnt; /* Requests waiting for activity log */ |
b411b363 PR |
875 | atomic_t ap_pending_cnt; /* AP data packets on the wire, ack expected */ |
876 | atomic_t rs_pending_cnt; /* RS request/data packets on the wire */ | |
d942ae44 | 877 | atomic_t unacked_cnt; /* Need to send replies for */ |
b411b363 | 878 | atomic_t local_cnt; /* Waiting for local completion */ |
7dbb4386 | 879 | atomic_t suspend_cnt; |
b2fb6dbe | 880 | |
dac1389c AG |
881 | /* Interval tree of pending local requests */ |
882 | struct rb_root read_requests; | |
de696716 | 883 | struct rb_root write_requests; |
b411b363 | 884 | |
844a6ae7 LE |
885 | /* for statistics and timeouts */ |
886 | /* [0] read, [1] write */ | |
887 | struct list_head pending_master_completion[2]; | |
888 | struct list_head pending_completion[2]; | |
889 | ||
aaaba345 LE |
890 | /* use checksums for *this* resync */ |
891 | bool use_csums; | |
4b0715f0 | 892 | /* blocks to resync in this run [unit BM_BLOCK_SIZE] */ |
b411b363 | 893 | unsigned long rs_total; |
4b0715f0 | 894 | /* number of resync blocks that failed in this run */ |
b411b363 PR |
895 | unsigned long rs_failed; |
896 | /* Syncer's start time [unit jiffies] */ | |
897 | unsigned long rs_start; | |
898 | /* cumulated time in PausedSyncX state [unit jiffies] */ | |
899 | unsigned long rs_paused; | |
1d7734a0 LE |
900 | /* skipped because csum was equal [unit BM_BLOCK_SIZE] */ |
901 | unsigned long rs_same_csum; | |
902 | #define DRBD_SYNC_MARKS 8 | |
903 | #define DRBD_SYNC_MARK_STEP (3*HZ) | |
b411b363 | 904 | /* block not up-to-date at mark [unit BM_BLOCK_SIZE] */ |
1d7734a0 | 905 | unsigned long rs_mark_left[DRBD_SYNC_MARKS]; |
b411b363 | 906 | /* marks's time [unit jiffies] */ |
1d7734a0 LE |
907 | unsigned long rs_mark_time[DRBD_SYNC_MARKS]; |
908 | /* current index into rs_mark_{left,time} */ | |
909 | int rs_last_mark; | |
328e0f12 | 910 | unsigned long rs_last_bcast; /* [unit jiffies] */ |
b411b363 PR |
911 | |
912 | /* where does the admin want us to start? (sector) */ | |
913 | sector_t ov_start_sector; | |
02b91b55 | 914 | sector_t ov_stop_sector; |
b411b363 PR |
915 | /* where are we now? (sector) */ |
916 | sector_t ov_position; | |
917 | /* Start sector of out of sync range (to merge printk reporting). */ | |
918 | sector_t ov_last_oos_start; | |
919 | /* size of out-of-sync range in sectors. */ | |
920 | sector_t ov_last_oos_size; | |
921 | unsigned long ov_left; /* in bits */ | |
b411b363 | 922 | |
b411b363 PR |
923 | struct drbd_bitmap *bitmap; |
924 | unsigned long bm_resync_fo; /* bit offset for drbd_bm_find_next */ | |
925 | ||
926 | /* Used to track operations of resync... */ | |
927 | struct lru_cache *resync; | |
928 | /* Number of locked elements in resync LRU */ | |
929 | unsigned int resync_locked; | |
930 | /* resync extent number waiting for application requests */ | |
931 | unsigned int resync_wenr; | |
932 | ||
933 | int open_cnt; | |
934 | u64 *p_uuid; | |
4b0007c0 | 935 | |
85719573 PR |
936 | struct list_head active_ee; /* IO in progress (P_DATA gets written to disk) */ |
937 | struct list_head sync_ee; /* IO in progress (P_RS_DATA_REPLY gets written to disk) */ | |
18b75d75 AG |
938 | struct list_head done_ee; /* need to send P_WRITE_ACK */ |
939 | struct list_head read_ee; /* [RS]P_DATA_REQUEST being read */ | |
b411b363 | 940 | struct list_head net_ee; /* zero-copy network send in progress */ |
b411b363 PR |
941 | |
942 | int next_barrier_nr; | |
b411b363 | 943 | struct list_head resync_reads; |
435f0740 LE |
944 | atomic_t pp_in_use; /* allocated from page pool */ |
945 | atomic_t pp_in_use_by_net; /* sendpage()d, still referenced by tcp */ | |
b411b363 | 946 | wait_queue_head_t ee_wait; |
cc94c650 | 947 | struct drbd_md_io md_io; |
b411b363 PR |
948 | spinlock_t al_lock; |
949 | wait_queue_head_t al_wait; | |
950 | struct lru_cache *act_log; /* activity log */ | |
951 | unsigned int al_tr_number; | |
952 | int al_tr_cycle; | |
b411b363 PR |
953 | wait_queue_head_t seq_wait; |
954 | atomic_t packet_seq; | |
955 | unsigned int peer_seq; | |
956 | spinlock_t peer_seq_lock; | |
b411b363 | 957 | unsigned long comm_bm_set; /* communicated number of set bits. */ |
b411b363 PR |
958 | struct bm_io_work bm_io_work; |
959 | u64 ed_uuid; /* UUID of the exposed data */ | |
8410da8f | 960 | struct mutex own_state_mutex; |
a6b32bc3 | 961 | struct mutex *state_mutex; /* either own_state_mutex or first_peer_device(device)->connection->cstate_mutex */ |
b411b363 | 962 | char congestion_reason; /* Why we where congested... */ |
1d7734a0 LE |
963 | atomic_t rs_sect_in; /* for incoming resync data rate, SyncTarget */ |
964 | atomic_t rs_sect_ev; /* for submitted resync data rate, both */ | |
965 | int rs_last_sect_ev; /* counter to compare with */ | |
966 | int rs_last_events; /* counter of read or write "events" (unit sectors) | |
967 | * on the lower level device when we last looked. */ | |
968 | int c_sync_rate; /* current resync rate after syncer throttle magic */ | |
bde89a9e | 969 | struct fifo_buffer *rs_plan_s; /* correction values of resync planer (RCU, connection->conn_update) */ |
778f271d | 970 | int rs_in_flight; /* resync sectors in flight (to proxy, in proxy and from proxy) */ |
759fbdfb | 971 | atomic_t ap_in_flight; /* App sectors in flight (waiting for ack) */ |
db141b2f LE |
972 | unsigned int peer_max_bio_size; |
973 | unsigned int local_max_bio_size; | |
113fef9e LE |
974 | |
975 | /* any requests that would block in drbd_make_request() | |
976 | * are deferred to this single-threaded work queue */ | |
977 | struct submit_worker submit; | |
b411b363 PR |
978 | }; |
979 | ||
4ce49266 LE |
980 | struct drbd_bm_aio_ctx { |
981 | struct drbd_device *device; | |
982 | struct list_head list; /* on device->pending_bitmap_io */; | |
983 | unsigned long start_jif; | |
984 | atomic_t in_flight; | |
985 | unsigned int done; | |
986 | unsigned flags; | |
987 | #define BM_AIO_COPY_PAGES 1 | |
988 | #define BM_AIO_WRITE_HINTED 2 | |
989 | #define BM_AIO_WRITE_ALL_PAGES 4 | |
990 | #define BM_AIO_READ 8 | |
991 | int error; | |
992 | struct kref kref; | |
993 | }; | |
994 | ||
a910b123 LE |
995 | struct drbd_config_context { |
996 | /* assigned from drbd_genlmsghdr */ | |
997 | unsigned int minor; | |
998 | /* assigned from request attributes, if present */ | |
999 | unsigned int volume; | |
1000 | #define VOLUME_UNSPECIFIED (-1U) | |
1001 | /* pointer into the request skb, | |
1002 | * limited lifetime! */ | |
1003 | char *resource_name; | |
1004 | struct nlattr *my_addr; | |
1005 | struct nlattr *peer_addr; | |
1006 | ||
1007 | /* reply buffer */ | |
1008 | struct sk_buff *reply_skb; | |
1009 | /* pointer into reply buffer */ | |
1010 | struct drbd_genlmsghdr *reply_dh; | |
1011 | /* resolved from attributes, if possible */ | |
1012 | struct drbd_device *device; | |
1013 | struct drbd_resource *resource; | |
1014 | struct drbd_connection *connection; | |
1015 | }; | |
1016 | ||
b30ab791 | 1017 | static inline struct drbd_device *minor_to_device(unsigned int minor) |
b411b363 | 1018 | { |
05a10ec7 | 1019 | return (struct drbd_device *)idr_find(&drbd_devices, minor); |
b411b363 PR |
1020 | } |
1021 | ||
a6b32bc3 AG |
1022 | static inline struct drbd_peer_device *first_peer_device(struct drbd_device *device) |
1023 | { | |
ec4a3407 | 1024 | return list_first_entry_or_null(&device->peer_devices, struct drbd_peer_device, peer_devices); |
a6b32bc3 AG |
1025 | } |
1026 | ||
a2972846 AG |
1027 | static inline struct drbd_peer_device * |
1028 | conn_peer_device(struct drbd_connection *connection, int volume_number) | |
1029 | { | |
1030 | return idr_find(&connection->peer_devices, volume_number); | |
1031 | } | |
1032 | ||
77c556f6 AG |
1033 | #define for_each_resource(resource, _resources) \ |
1034 | list_for_each_entry(resource, _resources, resources) | |
1035 | ||
1036 | #define for_each_resource_rcu(resource, _resources) \ | |
1037 | list_for_each_entry_rcu(resource, _resources, resources) | |
1038 | ||
1039 | #define for_each_resource_safe(resource, tmp, _resources) \ | |
1040 | list_for_each_entry_safe(resource, tmp, _resources, resources) | |
1041 | ||
1042 | #define for_each_connection(connection, resource) \ | |
1043 | list_for_each_entry(connection, &resource->connections, connections) | |
1044 | ||
1045 | #define for_each_connection_rcu(connection, resource) \ | |
1046 | list_for_each_entry_rcu(connection, &resource->connections, connections) | |
1047 | ||
1048 | #define for_each_connection_safe(connection, tmp, resource) \ | |
1049 | list_for_each_entry_safe(connection, tmp, &resource->connections, connections) | |
1050 | ||
a6b32bc3 AG |
1051 | #define for_each_peer_device(peer_device, device) \ |
1052 | list_for_each_entry(peer_device, &device->peer_devices, peer_devices) | |
1053 | ||
1054 | #define for_each_peer_device_rcu(peer_device, device) \ | |
1055 | list_for_each_entry_rcu(peer_device, &device->peer_devices, peer_devices) | |
1056 | ||
1057 | #define for_each_peer_device_safe(peer_device, tmp, device) \ | |
1058 | list_for_each_entry_safe(peer_device, tmp, &device->peer_devices, peer_devices) | |
1059 | ||
b30ab791 | 1060 | static inline unsigned int device_to_minor(struct drbd_device *device) |
b411b363 | 1061 | { |
b30ab791 | 1062 | return device->minor; |
b411b363 PR |
1063 | } |
1064 | ||
b411b363 PR |
1065 | /* |
1066 | * function declarations | |
1067 | *************************/ | |
1068 | ||
1069 | /* drbd_main.c */ | |
1070 | ||
e89b591c PR |
1071 | enum dds_flags { |
1072 | DDSF_FORCED = 1, | |
1073 | DDSF_NO_RESYNC = 2, /* Do not run a resync for the new space */ | |
1074 | }; | |
1075 | ||
b30ab791 | 1076 | extern void drbd_init_set_defaults(struct drbd_device *device); |
b411b363 PR |
1077 | extern int drbd_thread_start(struct drbd_thread *thi); |
1078 | extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait); | |
1079 | #ifdef CONFIG_SMP | |
80822284 | 1080 | extern void drbd_thread_current_set_cpu(struct drbd_thread *thi); |
b411b363 PR |
1081 | #else |
1082 | #define drbd_thread_current_set_cpu(A) ({}) | |
b411b363 | 1083 | #endif |
bde89a9e | 1084 | extern void tl_release(struct drbd_connection *, unsigned int barrier_nr, |
b411b363 | 1085 | unsigned int set_size); |
bde89a9e AG |
1086 | extern void tl_clear(struct drbd_connection *); |
1087 | extern void drbd_free_sock(struct drbd_connection *connection); | |
1088 | extern int drbd_send(struct drbd_connection *connection, struct socket *sock, | |
bedbd2a5 | 1089 | void *buf, size_t size, unsigned msg_flags); |
bde89a9e | 1090 | extern int drbd_send_all(struct drbd_connection *, struct socket *, void *, size_t, |
fb708e40 AG |
1091 | unsigned); |
1092 | ||
bde89a9e AG |
1093 | extern int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd); |
1094 | extern int drbd_send_protocol(struct drbd_connection *connection); | |
69a22773 AG |
1095 | extern int drbd_send_uuids(struct drbd_peer_device *); |
1096 | extern int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *); | |
1097 | extern void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *); | |
1098 | extern int drbd_send_sizes(struct drbd_peer_device *, int trigger_reply, enum dds_flags flags); | |
1099 | extern int drbd_send_state(struct drbd_peer_device *, union drbd_state s); | |
1100 | extern int drbd_send_current_state(struct drbd_peer_device *); | |
1101 | extern int drbd_send_sync_param(struct drbd_peer_device *); | |
bde89a9e | 1102 | extern void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, |
d4e67d7c | 1103 | u32 set_size); |
69a22773 | 1104 | extern int drbd_send_ack(struct drbd_peer_device *, enum drbd_packet, |
f6ffca9f | 1105 | struct drbd_peer_request *); |
69a22773 | 1106 | extern void drbd_send_ack_rp(struct drbd_peer_device *, enum drbd_packet, |
a9a9994d | 1107 | struct p_block_req *rp); |
69a22773 | 1108 | extern void drbd_send_ack_dp(struct drbd_peer_device *, enum drbd_packet, |
a9a9994d | 1109 | struct p_data *dp, int data_size); |
69a22773 | 1110 | extern int drbd_send_ack_ex(struct drbd_peer_device *, enum drbd_packet, |
b411b363 | 1111 | sector_t sector, int blksize, u64 block_id); |
69a22773 AG |
1112 | extern int drbd_send_out_of_sync(struct drbd_peer_device *, struct drbd_request *); |
1113 | extern int drbd_send_block(struct drbd_peer_device *, enum drbd_packet, | |
f6ffca9f | 1114 | struct drbd_peer_request *); |
69a22773 AG |
1115 | extern int drbd_send_dblock(struct drbd_peer_device *, struct drbd_request *req); |
1116 | extern int drbd_send_drequest(struct drbd_peer_device *, int cmd, | |
b411b363 | 1117 | sector_t sector, int size, u64 block_id); |
69a22773 | 1118 | extern int drbd_send_drequest_csum(struct drbd_peer_device *, sector_t sector, |
d8763023 AG |
1119 | int size, void *digest, int digest_size, |
1120 | enum drbd_packet cmd); | |
69a22773 | 1121 | extern int drbd_send_ov_request(struct drbd_peer_device *, sector_t sector, int size); |
b411b363 | 1122 | |
b30ab791 | 1123 | extern int drbd_send_bitmap(struct drbd_device *device); |
69a22773 | 1124 | extern void drbd_send_sr_reply(struct drbd_peer_device *, enum drbd_state_rv retcode); |
bde89a9e | 1125 | extern void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode); |
63a7c8ad | 1126 | extern void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev); |
b30ab791 AG |
1127 | extern void drbd_device_cleanup(struct drbd_device *device); |
1128 | void drbd_print_uuids(struct drbd_device *device, const char *text); | |
b411b363 | 1129 | |
bde89a9e | 1130 | extern void conn_md_sync(struct drbd_connection *connection); |
b30ab791 AG |
1131 | extern void drbd_md_write(struct drbd_device *device, void *buffer); |
1132 | extern void drbd_md_sync(struct drbd_device *device); | |
1133 | extern int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev); | |
1134 | extern void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); | |
1135 | extern void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); | |
1136 | extern void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local); | |
1137 | extern void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local); | |
1138 | extern void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local); | |
1139 | extern void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); | |
1140 | extern void drbd_md_set_flag(struct drbd_device *device, int flags) __must_hold(local); | |
1141 | extern void drbd_md_clear_flag(struct drbd_device *device, int flags)__must_hold(local); | |
b411b363 | 1142 | extern int drbd_md_test_flag(struct drbd_backing_dev *, int); |
b30ab791 | 1143 | extern void drbd_md_mark_dirty(struct drbd_device *device); |
b30ab791 | 1144 | extern void drbd_queue_bitmap_io(struct drbd_device *device, |
54761697 AG |
1145 | int (*io_fn)(struct drbd_device *), |
1146 | void (*done)(struct drbd_device *, int), | |
20ceb2b2 | 1147 | char *why, enum bm_flag flags); |
b30ab791 | 1148 | extern int drbd_bitmap_io(struct drbd_device *device, |
54761697 | 1149 | int (*io_fn)(struct drbd_device *), |
20ceb2b2 | 1150 | char *why, enum bm_flag flags); |
b30ab791 | 1151 | extern int drbd_bitmap_io_from_worker(struct drbd_device *device, |
54761697 | 1152 | int (*io_fn)(struct drbd_device *), |
edc9f5eb | 1153 | char *why, enum bm_flag flags); |
8fe39aac PR |
1154 | extern int drbd_bmio_set_n_write(struct drbd_device *device) __must_hold(local); |
1155 | extern int drbd_bmio_clear_n_write(struct drbd_device *device) __must_hold(local); | |
b411b363 | 1156 | |
b411b363 | 1157 | /* Meta data layout |
ae8bf312 LE |
1158 | * |
1159 | * We currently have two possible layouts. | |
1160 | * Offsets in (512 byte) sectors. | |
1161 | * external: | |
1162 | * |----------- md_size_sect ------------------| | |
1163 | * [ 4k superblock ][ activity log ][ Bitmap ] | |
1164 | * | al_offset == 8 | | |
1165 | * | bm_offset = al_offset + X | | |
1166 | * ==> bitmap sectors = md_size_sect - bm_offset | |
1167 | * | |
1168 | * Variants: | |
1169 | * old, indexed fixed size meta data: | |
1170 | * | |
1171 | * internal: | |
1172 | * |----------- md_size_sect ------------------| | |
1173 | * [data.....][ Bitmap ][ activity log ][ 4k superblock ][padding*] | |
1174 | * | al_offset < 0 | | |
1175 | * | bm_offset = al_offset - Y | | |
1176 | * ==> bitmap sectors = Y = al_offset - bm_offset | |
1177 | * | |
1178 | * [padding*] are zero or up to 7 unused 512 Byte sectors to the | |
1179 | * end of the device, so that the [4k superblock] will be 4k aligned. | |
1180 | * | |
1181 | * The activity log consists of 4k transaction blocks, | |
1182 | * which are written in a ring-buffer, or striped ring-buffer like fashion, | |
1183 | * which are writtensize used to be fixed 32kB, | |
1184 | * but is about to become configurable. | |
1185 | */ | |
b411b363 | 1186 | |
ae8bf312 LE |
1187 | /* Our old fixed size meta data layout |
1188 | * allows up to about 3.8TB, so if you want more, | |
7ad651b5 | 1189 | * you need to use the "flexible" meta data format. */ |
ae8bf312 LE |
1190 | #define MD_128MB_SECT (128LLU << 11) /* 128 MB, unit sectors */ |
1191 | #define MD_4kB_SECT 8 | |
1192 | #define MD_32kB_SECT 64 | |
7ad651b5 LE |
1193 | |
1194 | /* One activity log extent represents 4M of storage */ | |
1195 | #define AL_EXTENT_SHIFT 22 | |
b411b363 PR |
1196 | #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT) |
1197 | ||
7ad651b5 LE |
1198 | /* We could make these currently hardcoded constants configurable |
1199 | * variables at create-md time (or even re-configurable at runtime?). | |
1200 | * Which will require some more changes to the DRBD "super block" | |
1201 | * and attach code. | |
1202 | * | |
1203 | * updates per transaction: | |
1204 | * This many changes to the active set can be logged with one transaction. | |
1205 | * This number is arbitrary. | |
1206 | * context per transaction: | |
1207 | * This many context extent numbers are logged with each transaction. | |
1208 | * This number is resulting from the transaction block size (4k), the layout | |
1209 | * of the transaction header, and the number of updates per transaction. | |
1210 | * See drbd_actlog.c:struct al_transaction_on_disk | |
1211 | * */ | |
1212 | #define AL_UPDATES_PER_TRANSACTION 64 // arbitrary | |
1213 | #define AL_CONTEXT_PER_TRANSACTION 919 // (4096 - 36 - 6*64)/4 | |
1214 | ||
b411b363 PR |
1215 | #if BITS_PER_LONG == 32 |
1216 | #define LN2_BPL 5 | |
1217 | #define cpu_to_lel(A) cpu_to_le32(A) | |
1218 | #define lel_to_cpu(A) le32_to_cpu(A) | |
1219 | #elif BITS_PER_LONG == 64 | |
1220 | #define LN2_BPL 6 | |
1221 | #define cpu_to_lel(A) cpu_to_le64(A) | |
1222 | #define lel_to_cpu(A) le64_to_cpu(A) | |
1223 | #else | |
1224 | #error "LN2 of BITS_PER_LONG unknown!" | |
1225 | #endif | |
1226 | ||
1227 | /* resync bitmap */ | |
1228 | /* 16MB sized 'bitmap extent' to track syncer usage */ | |
1229 | struct bm_extent { | |
1230 | int rs_left; /* number of bits set (out of sync) in this extent. */ | |
1231 | int rs_failed; /* number of failed resync requests in this extent. */ | |
1232 | unsigned long flags; | |
1233 | struct lc_element lce; | |
1234 | }; | |
1235 | ||
1236 | #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */ | |
1237 | #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */ | |
e3555d85 | 1238 | #define BME_PRIORITY 2 /* finish resync IO on this extent ASAP! App IO waiting! */ |
b411b363 PR |
1239 | |
1240 | /* drbd_bitmap.c */ | |
1241 | /* | |
1242 | * We need to store one bit for a block. | |
1243 | * Example: 1GB disk @ 4096 byte blocks ==> we need 32 KB bitmap. | |
1244 | * Bit 0 ==> local node thinks this block is binary identical on both nodes | |
1245 | * Bit 1 ==> local node thinks this block needs to be synced. | |
1246 | */ | |
1247 | ||
8e26f9cc PR |
1248 | #define SLEEP_TIME (HZ/10) |
1249 | ||
45dfffeb LE |
1250 | /* We do bitmap IO in units of 4k blocks. |
1251 | * We also still have a hardcoded 4k per bit relation. */ | |
1252 | #define BM_BLOCK_SHIFT 12 /* 4k per bit */ | |
b411b363 | 1253 | #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT) |
45dfffeb LE |
1254 | /* mostly arbitrarily set the represented size of one bitmap extent, |
1255 | * aka resync extent, to 16 MiB (which is also 512 Byte worth of bitmap | |
1256 | * at 4k per bit resolution) */ | |
1257 | #define BM_EXT_SHIFT 24 /* 16 MiB per resync extent */ | |
b411b363 PR |
1258 | #define BM_EXT_SIZE (1<<BM_EXT_SHIFT) |
1259 | ||
1260 | #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12) | |
1261 | #error "HAVE YOU FIXED drbdmeta AS WELL??" | |
1262 | #endif | |
1263 | ||
1264 | /* thus many _storage_ sectors are described by one bit */ | |
1265 | #define BM_SECT_TO_BIT(x) ((x)>>(BM_BLOCK_SHIFT-9)) | |
1266 | #define BM_BIT_TO_SECT(x) ((sector_t)(x)<<(BM_BLOCK_SHIFT-9)) | |
1267 | #define BM_SECT_PER_BIT BM_BIT_TO_SECT(1) | |
1268 | ||
1269 | /* bit to represented kilo byte conversion */ | |
1270 | #define Bit2KB(bits) ((bits)<<(BM_BLOCK_SHIFT-10)) | |
1271 | ||
1272 | /* in which _bitmap_ extent (resp. sector) the bit for a certain | |
1273 | * _storage_ sector is located in */ | |
1274 | #define BM_SECT_TO_EXT(x) ((x)>>(BM_EXT_SHIFT-9)) | |
5ab7d2c0 | 1275 | #define BM_BIT_TO_EXT(x) ((x) >> (BM_EXT_SHIFT - BM_BLOCK_SHIFT)) |
b411b363 | 1276 | |
5ab7d2c0 | 1277 | /* first storage sector a bitmap extent corresponds to */ |
b411b363 | 1278 | #define BM_EXT_TO_SECT(x) ((sector_t)(x) << (BM_EXT_SHIFT-9)) |
5ab7d2c0 | 1279 | /* how much _storage_ sectors we have per bitmap extent */ |
b411b363 | 1280 | #define BM_SECT_PER_EXT BM_EXT_TO_SECT(1) |
5ab7d2c0 LE |
1281 | /* how many bits are covered by one bitmap extent (resync extent) */ |
1282 | #define BM_BITS_PER_EXT (1UL << (BM_EXT_SHIFT - BM_BLOCK_SHIFT)) | |
1283 | ||
1284 | #define BM_BLOCKS_PER_BM_EXT_MASK (BM_BITS_PER_EXT - 1) | |
1285 | ||
b411b363 PR |
1286 | |
1287 | /* in one sector of the bitmap, we have this many activity_log extents. */ | |
1288 | #define AL_EXT_PER_BM_SECT (1 << (BM_EXT_SHIFT - AL_EXTENT_SHIFT)) | |
b411b363 | 1289 | |
b411b363 PR |
1290 | /* the extent in "PER_EXTENT" below is an activity log extent |
1291 | * we need that many (long words/bytes) to store the bitmap | |
1292 | * of one AL_EXTENT_SIZE chunk of storage. | |
1293 | * we can store the bitmap for that many AL_EXTENTS within | |
1294 | * one sector of the _on_disk_ bitmap: | |
1295 | * bit 0 bit 37 bit 38 bit (512*8)-1 | |
1296 | * ...|........|........|.. // ..|........| | |
1297 | * sect. 0 `296 `304 ^(512*8*8)-1 | |
1298 | * | |
1299 | #define BM_WORDS_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / BITS_PER_LONG ) | |
1300 | #define BM_BYTES_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / 8 ) // 128 | |
1301 | #define BM_EXT_PER_SECT ( 512 / BM_BYTES_PER_EXTENT ) // 4 | |
1302 | */ | |
1303 | ||
1304 | #define DRBD_MAX_SECTORS_32 (0xffffffffLU) | |
ae8bf312 LE |
1305 | /* we have a certain meta data variant that has a fixed on-disk size of 128 |
1306 | * MiB, of which 4k are our "superblock", and 32k are the fixed size activity | |
1307 | * log, leaving this many sectors for the bitmap. | |
1308 | */ | |
1309 | ||
1310 | #define DRBD_MAX_SECTORS_FIXED_BM \ | |
1311 | ((MD_128MB_SECT - MD_32kB_SECT - MD_4kB_SECT) * (1LL<<(BM_EXT_SHIFT-9))) | |
1312 | #if !defined(CONFIG_LBDAF) && BITS_PER_LONG == 32 | |
b411b363 PR |
1313 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_32 |
1314 | #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_32 | |
1315 | #else | |
ae8bf312 | 1316 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_FIXED_BM |
b411b363 PR |
1317 | /* 16 TB in units of sectors */ |
1318 | #if BITS_PER_LONG == 32 | |
1319 | /* adjust by one page worth of bitmap, | |
1320 | * so we won't wrap around in drbd_bm_find_next_bit. | |
1321 | * you should use 64bit OS for that much storage, anyways. */ | |
1322 | #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) | |
1323 | #else | |
4b0715f0 LE |
1324 | /* we allow up to 1 PiB now on 64bit architecture with "flexible" meta data */ |
1325 | #define DRBD_MAX_SECTORS_FLEX (1UL << 51) | |
1326 | /* corresponds to (1UL << 38) bits right now. */ | |
b411b363 PR |
1327 | #endif |
1328 | #endif | |
1329 | ||
23361cf3 LE |
1330 | /* BIO_MAX_SIZE is 256 * PAGE_CACHE_SIZE, |
1331 | * so for typical PAGE_CACHE_SIZE of 4k, that is (1<<20) Byte. | |
1332 | * Since we may live in a mixed-platform cluster, | |
1333 | * we limit us to a platform agnostic constant here for now. | |
1334 | * A followup commit may allow even bigger BIO sizes, | |
1335 | * once we thought that through. */ | |
98683650 | 1336 | #define DRBD_MAX_BIO_SIZE (1U << 20) |
23361cf3 LE |
1337 | #if DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE |
1338 | #error Architecture not supported: DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE | |
1339 | #endif | |
db141b2f | 1340 | #define DRBD_MAX_BIO_SIZE_SAFE (1U << 12) /* Works always = 4k */ |
b411b363 | 1341 | |
98683650 PR |
1342 | #define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* Header 80 only allows packets up to 32KiB data */ |
1343 | #define DRBD_MAX_BIO_SIZE_P95 (1U << 17) /* Protocol 95 to 99 allows bios up to 128KiB */ | |
b411b363 | 1344 | |
a0fb3c47 LE |
1345 | /* For now, don't allow more than one activity log extent worth of data |
1346 | * to be discarded in one go. We may need to rework drbd_al_begin_io() | |
1347 | * to allow for even larger discard ranges */ | |
1348 | #define DRBD_MAX_DISCARD_SIZE AL_EXTENT_SIZE | |
1349 | #define DRBD_MAX_DISCARD_SECTORS (DRBD_MAX_DISCARD_SIZE >> 9) | |
1350 | ||
b30ab791 AG |
1351 | extern int drbd_bm_init(struct drbd_device *device); |
1352 | extern int drbd_bm_resize(struct drbd_device *device, sector_t sectors, int set_new_bits); | |
1353 | extern void drbd_bm_cleanup(struct drbd_device *device); | |
1354 | extern void drbd_bm_set_all(struct drbd_device *device); | |
1355 | extern void drbd_bm_clear_all(struct drbd_device *device); | |
4b0715f0 | 1356 | /* set/clear/test only a few bits at a time */ |
b411b363 | 1357 | extern int drbd_bm_set_bits( |
b30ab791 | 1358 | struct drbd_device *device, unsigned long s, unsigned long e); |
b411b363 | 1359 | extern int drbd_bm_clear_bits( |
b30ab791 | 1360 | struct drbd_device *device, unsigned long s, unsigned long e); |
4b0715f0 | 1361 | extern int drbd_bm_count_bits( |
b30ab791 | 1362 | struct drbd_device *device, const unsigned long s, const unsigned long e); |
4b0715f0 LE |
1363 | /* bm_set_bits variant for use while holding drbd_bm_lock, |
1364 | * may process the whole bitmap in one go */ | |
b30ab791 | 1365 | extern void _drbd_bm_set_bits(struct drbd_device *device, |
b411b363 | 1366 | const unsigned long s, const unsigned long e); |
b30ab791 AG |
1367 | extern int drbd_bm_test_bit(struct drbd_device *device, unsigned long bitnr); |
1368 | extern int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr); | |
b30ab791 AG |
1369 | extern int drbd_bm_read(struct drbd_device *device) __must_hold(local); |
1370 | extern void drbd_bm_mark_for_writeout(struct drbd_device *device, int page_nr); | |
1371 | extern int drbd_bm_write(struct drbd_device *device) __must_hold(local); | |
1372 | extern int drbd_bm_write_hinted(struct drbd_device *device) __must_hold(local); | |
c7a58db4 | 1373 | extern int drbd_bm_write_lazy(struct drbd_device *device, unsigned upper_idx) __must_hold(local); |
b30ab791 AG |
1374 | extern int drbd_bm_write_all(struct drbd_device *device) __must_hold(local); |
1375 | extern int drbd_bm_write_copy_pages(struct drbd_device *device) __must_hold(local); | |
1376 | extern size_t drbd_bm_words(struct drbd_device *device); | |
1377 | extern unsigned long drbd_bm_bits(struct drbd_device *device); | |
1378 | extern sector_t drbd_bm_capacity(struct drbd_device *device); | |
4b0715f0 LE |
1379 | |
1380 | #define DRBD_END_OF_BITMAP (~(unsigned long)0) | |
b30ab791 | 1381 | extern unsigned long drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); |
b411b363 | 1382 | /* bm_find_next variants for use while you hold drbd_bm_lock() */ |
b30ab791 AG |
1383 | extern unsigned long _drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); |
1384 | extern unsigned long _drbd_bm_find_next_zero(struct drbd_device *device, unsigned long bm_fo); | |
1385 | extern unsigned long _drbd_bm_total_weight(struct drbd_device *device); | |
1386 | extern unsigned long drbd_bm_total_weight(struct drbd_device *device); | |
b411b363 | 1387 | /* for receive_bitmap */ |
b30ab791 | 1388 | extern void drbd_bm_merge_lel(struct drbd_device *device, size_t offset, |
b411b363 | 1389 | size_t number, unsigned long *buffer); |
19f843aa | 1390 | /* for _drbd_send_bitmap */ |
b30ab791 | 1391 | extern void drbd_bm_get_lel(struct drbd_device *device, size_t offset, |
b411b363 PR |
1392 | size_t number, unsigned long *buffer); |
1393 | ||
b30ab791 AG |
1394 | extern void drbd_bm_lock(struct drbd_device *device, char *why, enum bm_flag flags); |
1395 | extern void drbd_bm_unlock(struct drbd_device *device); | |
b411b363 PR |
1396 | /* drbd_main.c */ |
1397 | ||
1398 | extern struct kmem_cache *drbd_request_cache; | |
6c852bec | 1399 | extern struct kmem_cache *drbd_ee_cache; /* peer requests */ |
b411b363 PR |
1400 | extern struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
1401 | extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ | |
1402 | extern mempool_t *drbd_request_mempool; | |
1403 | extern mempool_t *drbd_ee_mempool; | |
1404 | ||
4281808f LE |
1405 | /* drbd's page pool, used to buffer data received from the peer, |
1406 | * or data requested by the peer. | |
1407 | * | |
1408 | * This does not have an emergency reserve. | |
1409 | * | |
1410 | * When allocating from this pool, it first takes pages from the pool. | |
1411 | * Only if the pool is depleted will try to allocate from the system. | |
1412 | * | |
1413 | * The assumption is that pages taken from this pool will be processed, | |
1414 | * and given back, "quickly", and then can be recycled, so we can avoid | |
1415 | * frequent calls to alloc_page(), and still will be able to make progress even | |
1416 | * under memory pressure. | |
1417 | */ | |
1418 | extern struct page *drbd_pp_pool; | |
b411b363 PR |
1419 | extern spinlock_t drbd_pp_lock; |
1420 | extern int drbd_pp_vacant; | |
1421 | extern wait_queue_head_t drbd_pp_wait; | |
1422 | ||
4281808f LE |
1423 | /* We also need a standard (emergency-reserve backed) page pool |
1424 | * for meta data IO (activity log, bitmap). | |
1425 | * We can keep it global, as long as it is used as "N pages at a time". | |
1426 | * 128 should be plenty, currently we probably can get away with as few as 1. | |
1427 | */ | |
1428 | #define DRBD_MIN_POOL_PAGES 128 | |
1429 | extern mempool_t *drbd_md_io_page_pool; | |
1430 | ||
9476f39d LE |
1431 | /* We also need to make sure we get a bio |
1432 | * when we need it for housekeeping purposes */ | |
1433 | extern struct bio_set *drbd_md_io_bio_set; | |
1434 | /* to allocate from that set */ | |
1435 | extern struct bio *bio_alloc_drbd(gfp_t gfp_mask); | |
1436 | ||
28bc3b8c | 1437 | extern struct mutex resources_mutex; |
b411b363 | 1438 | |
bde89a9e | 1439 | extern int conn_lowest_minor(struct drbd_connection *connection); |
a910b123 | 1440 | extern enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor); |
05a10ec7 | 1441 | extern void drbd_destroy_device(struct kref *kref); |
a910b123 | 1442 | extern void drbd_delete_device(struct drbd_device *device); |
b411b363 | 1443 | |
77c556f6 AG |
1444 | extern struct drbd_resource *drbd_create_resource(const char *name); |
1445 | extern void drbd_free_resource(struct drbd_resource *resource); | |
1446 | ||
eb6bea67 | 1447 | extern int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts); |
bde89a9e | 1448 | extern struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts); |
05a10ec7 | 1449 | extern void drbd_destroy_connection(struct kref *kref); |
bde89a9e | 1450 | extern struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len, |
089c075d | 1451 | void *peer_addr, int peer_addr_len); |
4bc76048 | 1452 | extern struct drbd_resource *drbd_find_resource(const char *name); |
77c556f6 | 1453 | extern void drbd_destroy_resource(struct kref *kref); |
bde89a9e | 1454 | extern void conn_free_crypto(struct drbd_connection *connection); |
b411b363 PR |
1455 | |
1456 | extern int proc_details; | |
1457 | ||
1458 | /* drbd_req */ | |
113fef9e | 1459 | extern void do_submit(struct work_struct *ws); |
54761697 | 1460 | extern void __drbd_make_request(struct drbd_device *, struct bio *, unsigned long); |
dece1635 | 1461 | extern blk_qc_t drbd_make_request(struct request_queue *q, struct bio *bio); |
b30ab791 | 1462 | extern int drbd_read_remote(struct drbd_device *device, struct drbd_request *req); |
b411b363 PR |
1463 | extern int is_valid_ar_handle(struct drbd_request *, sector_t); |
1464 | ||
1465 | ||
1466 | /* drbd_nl.c */ | |
a2972846 AG |
1467 | |
1468 | extern struct mutex notification_mutex; | |
1469 | ||
b30ab791 AG |
1470 | extern void drbd_suspend_io(struct drbd_device *device); |
1471 | extern void drbd_resume_io(struct drbd_device *device); | |
b411b363 | 1472 | extern char *ppsize(char *buf, unsigned long long size); |
54761697 | 1473 | extern sector_t drbd_new_dev_size(struct drbd_device *, struct drbd_backing_dev *, sector_t, int); |
e96c9633 | 1474 | enum determine_dev_size { |
d752b269 PR |
1475 | DS_ERROR_SHRINK = -3, |
1476 | DS_ERROR_SPACE_MD = -2, | |
e96c9633 PR |
1477 | DS_ERROR = -1, |
1478 | DS_UNCHANGED = 0, | |
1479 | DS_SHRUNK = 1, | |
57737adc PR |
1480 | DS_GREW = 2, |
1481 | DS_GREW_FROM_ZERO = 3, | |
e96c9633 | 1482 | }; |
d752b269 | 1483 | extern enum determine_dev_size |
54761697 AG |
1484 | drbd_determine_dev_size(struct drbd_device *, enum dds_flags, struct resize_parms *) __must_hold(local); |
1485 | extern void resync_after_online_grow(struct drbd_device *); | |
8fe39aac | 1486 | extern void drbd_reconsider_max_bio_size(struct drbd_device *device, struct drbd_backing_dev *bdev); |
b30ab791 | 1487 | extern enum drbd_state_rv drbd_set_role(struct drbd_device *device, |
bf885f8a AG |
1488 | enum drbd_role new_role, |
1489 | int force); | |
bde89a9e AG |
1490 | extern bool conn_try_outdate_peer(struct drbd_connection *connection); |
1491 | extern void conn_try_outdate_peer_async(struct drbd_connection *connection); | |
b30ab791 | 1492 | extern int drbd_khelper(struct drbd_device *device, char *cmd); |
b411b363 PR |
1493 | |
1494 | /* drbd_worker.c */ | |
d40e5671 | 1495 | /* bi_end_io handlers */ |
4246a0b6 CH |
1496 | extern void drbd_md_endio(struct bio *bio); |
1497 | extern void drbd_peer_request_endio(struct bio *bio); | |
1498 | extern void drbd_request_endio(struct bio *bio); | |
b411b363 | 1499 | extern int drbd_worker(struct drbd_thread *thi); |
b30ab791 AG |
1500 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor); |
1501 | void drbd_resync_after_changed(struct drbd_device *device); | |
1502 | extern void drbd_start_resync(struct drbd_device *device, enum drbd_conns side); | |
1503 | extern void resume_next_sg(struct drbd_device *device); | |
1504 | extern void suspend_other_sg(struct drbd_device *device); | |
1505 | extern int drbd_resync_finished(struct drbd_device *device); | |
b411b363 | 1506 | /* maybe rather drbd_main.c ? */ |
e37d2438 | 1507 | extern void *drbd_md_get_buffer(struct drbd_device *device, const char *intent); |
b30ab791 AG |
1508 | extern void drbd_md_put_buffer(struct drbd_device *device); |
1509 | extern int drbd_md_sync_page_io(struct drbd_device *device, | |
b411b363 | 1510 | struct drbd_backing_dev *bdev, sector_t sector, int rw); |
54761697 | 1511 | extern void drbd_ov_out_of_sync_found(struct drbd_device *, sector_t, int); |
b30ab791 | 1512 | extern void wait_until_done_or_force_detached(struct drbd_device *device, |
44edfb0d | 1513 | struct drbd_backing_dev *bdev, unsigned int *done); |
b30ab791 | 1514 | extern void drbd_rs_controller_reset(struct drbd_device *device); |
b411b363 | 1515 | |
b30ab791 | 1516 | static inline void ov_out_of_sync_print(struct drbd_device *device) |
b411b363 | 1517 | { |
b30ab791 | 1518 | if (device->ov_last_oos_size) { |
d0180171 | 1519 | drbd_err(device, "Out of sync: start=%llu, size=%lu (sectors)\n", |
b30ab791 AG |
1520 | (unsigned long long)device->ov_last_oos_start, |
1521 | (unsigned long)device->ov_last_oos_size); | |
b411b363 | 1522 | } |
b30ab791 | 1523 | device->ov_last_oos_size = 0; |
b411b363 PR |
1524 | } |
1525 | ||
1526 | ||
79a3c8d3 AG |
1527 | extern void drbd_csum_bio(struct crypto_hash *, struct bio *, void *); |
1528 | extern void drbd_csum_ee(struct crypto_hash *, struct drbd_peer_request *, void *); | |
b411b363 | 1529 | /* worker callbacks */ |
99920dc5 AG |
1530 | extern int w_e_end_data_req(struct drbd_work *, int); |
1531 | extern int w_e_end_rsdata_req(struct drbd_work *, int); | |
1532 | extern int w_e_end_csum_rs_req(struct drbd_work *, int); | |
1533 | extern int w_e_end_ov_reply(struct drbd_work *, int); | |
1534 | extern int w_e_end_ov_req(struct drbd_work *, int); | |
1535 | extern int w_ov_finished(struct drbd_work *, int); | |
1536 | extern int w_resync_timer(struct drbd_work *, int); | |
1537 | extern int w_send_write_hint(struct drbd_work *, int); | |
99920dc5 | 1538 | extern int w_send_dblock(struct drbd_work *, int); |
99920dc5 | 1539 | extern int w_send_read_req(struct drbd_work *, int); |
99920dc5 AG |
1540 | extern int w_e_reissue(struct drbd_work *, int); |
1541 | extern int w_restart_disk_io(struct drbd_work *, int); | |
8f7bed77 | 1542 | extern int w_send_out_of_sync(struct drbd_work *, int); |
99920dc5 | 1543 | extern int w_start_resync(struct drbd_work *, int); |
b411b363 PR |
1544 | |
1545 | extern void resync_timer_fn(unsigned long data); | |
370a43e7 | 1546 | extern void start_resync_timer_fn(unsigned long data); |
b411b363 | 1547 | |
a0fb3c47 LE |
1548 | extern void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req); |
1549 | ||
b411b363 | 1550 | /* drbd_receiver.c */ |
753c6191 | 1551 | extern int drbd_receiver(struct drbd_thread *thi); |
1c03e520 | 1552 | extern int drbd_ack_receiver(struct drbd_thread *thi); |
668700b4 PR |
1553 | extern void drbd_send_ping_wf(struct work_struct *ws); |
1554 | extern void drbd_send_acks_wf(struct work_struct *ws); | |
e8299874 | 1555 | extern bool drbd_rs_c_min_rate_throttle(struct drbd_device *device); |
ad3fee79 LE |
1556 | extern bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, |
1557 | bool throttle_if_app_is_waiting); | |
54761697 | 1558 | extern int drbd_submit_peer_request(struct drbd_device *, |
fbe29dec AG |
1559 | struct drbd_peer_request *, const unsigned, |
1560 | const int); | |
54761697 | 1561 | extern int drbd_free_peer_reqs(struct drbd_device *, struct list_head *); |
69a22773 | 1562 | extern struct drbd_peer_request *drbd_alloc_peer_req(struct drbd_peer_device *, u64, |
0db55363 | 1563 | sector_t, unsigned int, |
a0fb3c47 | 1564 | bool, |
0db55363 | 1565 | gfp_t) __must_hold(local); |
54761697 | 1566 | extern void __drbd_free_peer_req(struct drbd_device *, struct drbd_peer_request *, |
3967deb1 AG |
1567 | int); |
1568 | #define drbd_free_peer_req(m,e) __drbd_free_peer_req(m, e, 0) | |
1569 | #define drbd_free_net_peer_req(m,e) __drbd_free_peer_req(m, e, 1) | |
69a22773 | 1570 | extern struct page *drbd_alloc_pages(struct drbd_peer_device *, unsigned int, bool); |
b30ab791 AG |
1571 | extern void drbd_set_recv_tcq(struct drbd_device *device, int tcq_enabled); |
1572 | extern void _drbd_clear_done_ee(struct drbd_device *device, struct list_head *to_be_freed); | |
69a22773 | 1573 | extern int drbd_connected(struct drbd_peer_device *); |
b411b363 | 1574 | |
b411b363 PR |
1575 | static inline void drbd_tcp_cork(struct socket *sock) |
1576 | { | |
ed439848 | 1577 | int val = 1; |
e805b983 | 1578 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_CORK, |
ed439848 | 1579 | (char*)&val, sizeof(val)); |
b411b363 PR |
1580 | } |
1581 | ||
1582 | static inline void drbd_tcp_uncork(struct socket *sock) | |
1583 | { | |
ed439848 | 1584 | int val = 0; |
e805b983 | 1585 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_CORK, |
ed439848 | 1586 | (char*)&val, sizeof(val)); |
b411b363 PR |
1587 | } |
1588 | ||
1589 | static inline void drbd_tcp_nodelay(struct socket *sock) | |
1590 | { | |
ed439848 | 1591 | int val = 1; |
e805b983 | 1592 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, |
ed439848 | 1593 | (char*)&val, sizeof(val)); |
b411b363 PR |
1594 | } |
1595 | ||
1596 | static inline void drbd_tcp_quickack(struct socket *sock) | |
1597 | { | |
ed439848 | 1598 | int val = 2; |
e805b983 | 1599 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_QUICKACK, |
ed439848 | 1600 | (char*)&val, sizeof(val)); |
b411b363 PR |
1601 | } |
1602 | ||
d40e5671 PR |
1603 | /* sets the number of 512 byte sectors of our virtual device */ |
1604 | static inline void drbd_set_my_capacity(struct drbd_device *device, | |
1605 | sector_t size) | |
1606 | { | |
1607 | /* set_capacity(device->this_bdev->bd_disk, size); */ | |
1608 | set_capacity(device->vdisk, size); | |
1609 | device->this_bdev->bd_inode->i_size = (loff_t)size << 9; | |
1610 | } | |
1611 | ||
1612 | /* | |
1613 | * used to submit our private bio | |
1614 | */ | |
1615 | static inline void drbd_generic_make_request(struct drbd_device *device, | |
1616 | int fault_type, struct bio *bio) | |
1617 | { | |
1618 | __release(local); | |
1619 | if (!bio->bi_bdev) { | |
f88c5d90 | 1620 | drbd_err(device, "drbd_generic_make_request: bio->bi_bdev == NULL\n"); |
4246a0b6 CH |
1621 | bio->bi_error = -ENODEV; |
1622 | bio_endio(bio); | |
d40e5671 PR |
1623 | return; |
1624 | } | |
1625 | ||
1626 | if (drbd_insert_fault(device, fault_type)) | |
4246a0b6 | 1627 | bio_io_error(bio); |
d40e5671 PR |
1628 | else |
1629 | generic_make_request(bio); | |
1630 | } | |
1631 | ||
8fe39aac PR |
1632 | void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
1633 | enum write_ordering_e wo); | |
b411b363 PR |
1634 | |
1635 | /* drbd_proc.c */ | |
1636 | extern struct proc_dir_entry *drbd_proc; | |
7d4e9d09 | 1637 | extern const struct file_operations drbd_proc_fops; |
b411b363 PR |
1638 | extern const char *drbd_conn_str(enum drbd_conns s); |
1639 | extern const char *drbd_role_str(enum drbd_role s); | |
1640 | ||
1641 | /* drbd_actlog.c */ | |
e4d7d6f4 | 1642 | extern bool drbd_al_begin_io_prepare(struct drbd_device *device, struct drbd_interval *i); |
b30ab791 | 1643 | extern int drbd_al_begin_io_nonblock(struct drbd_device *device, struct drbd_interval *i); |
4dd726f0 | 1644 | extern void drbd_al_begin_io_commit(struct drbd_device *device); |
b30ab791 | 1645 | extern bool drbd_al_begin_io_fastpath(struct drbd_device *device, struct drbd_interval *i); |
4dd726f0 | 1646 | extern void drbd_al_begin_io(struct drbd_device *device, struct drbd_interval *i); |
b30ab791 AG |
1647 | extern void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i); |
1648 | extern void drbd_rs_complete_io(struct drbd_device *device, sector_t sector); | |
1649 | extern int drbd_rs_begin_io(struct drbd_device *device, sector_t sector); | |
1650 | extern int drbd_try_rs_begin_io(struct drbd_device *device, sector_t sector); | |
1651 | extern void drbd_rs_cancel_all(struct drbd_device *device); | |
1652 | extern int drbd_rs_del_all(struct drbd_device *device); | |
1653 | extern void drbd_rs_failed_io(struct drbd_device *device, | |
b411b363 | 1654 | sector_t sector, int size); |
b30ab791 | 1655 | extern void drbd_advance_rs_marks(struct drbd_device *device, unsigned long still_to_go); |
5ab7d2c0 LE |
1656 | |
1657 | enum update_sync_bits_mode { RECORD_RS_FAILED, SET_OUT_OF_SYNC, SET_IN_SYNC }; | |
1658 | extern int __drbd_change_sync(struct drbd_device *device, sector_t sector, int size, | |
179e20b8 | 1659 | enum update_sync_bits_mode mode); |
b30ab791 | 1660 | #define drbd_set_in_sync(device, sector, size) \ |
179e20b8 | 1661 | __drbd_change_sync(device, sector, size, SET_IN_SYNC) |
b30ab791 | 1662 | #define drbd_set_out_of_sync(device, sector, size) \ |
179e20b8 | 1663 | __drbd_change_sync(device, sector, size, SET_OUT_OF_SYNC) |
5ab7d2c0 | 1664 | #define drbd_rs_failed_io(device, sector, size) \ |
179e20b8 | 1665 | __drbd_change_sync(device, sector, size, RECORD_RS_FAILED) |
b30ab791 | 1666 | extern void drbd_al_shrink(struct drbd_device *device); |
5f7c0124 | 1667 | extern int drbd_al_initialize(struct drbd_device *, void *); |
b411b363 | 1668 | |
b411b363 | 1669 | /* drbd_nl.c */ |
3b98c0c2 LE |
1670 | /* state info broadcast */ |
1671 | struct sib_info { | |
1672 | enum drbd_state_info_bcast_reason sib_reason; | |
1673 | union { | |
1674 | struct { | |
1675 | char *helper_name; | |
1676 | unsigned helper_exit_code; | |
1677 | }; | |
1678 | struct { | |
1679 | union drbd_state os; | |
1680 | union drbd_state ns; | |
1681 | }; | |
1682 | }; | |
1683 | }; | |
b30ab791 | 1684 | void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib); |
b411b363 | 1685 | |
a2972846 AG |
1686 | extern void notify_resource_state(struct sk_buff *, |
1687 | unsigned int, | |
1688 | struct drbd_resource *, | |
1689 | struct resource_info *, | |
1690 | enum drbd_notification_type); | |
1691 | extern void notify_device_state(struct sk_buff *, | |
1692 | unsigned int, | |
1693 | struct drbd_device *, | |
1694 | struct device_info *, | |
1695 | enum drbd_notification_type); | |
1696 | extern void notify_connection_state(struct sk_buff *, | |
1697 | unsigned int, | |
1698 | struct drbd_connection *, | |
1699 | struct connection_info *, | |
1700 | enum drbd_notification_type); | |
1701 | extern void notify_peer_device_state(struct sk_buff *, | |
1702 | unsigned int, | |
1703 | struct drbd_peer_device *, | |
1704 | struct peer_device_info *, | |
1705 | enum drbd_notification_type); | |
1706 | extern void notify_helper(enum drbd_notification_type, struct drbd_device *, | |
1707 | struct drbd_connection *, const char *, int); | |
1708 | ||
b411b363 PR |
1709 | /* |
1710 | * inline helper functions | |
1711 | *************************/ | |
1712 | ||
45bb912b LE |
1713 | /* see also page_chain_add and friends in drbd_receiver.c */ |
1714 | static inline struct page *page_chain_next(struct page *page) | |
1715 | { | |
1716 | return (struct page *)page_private(page); | |
1717 | } | |
1718 | #define page_chain_for_each(page) \ | |
1719 | for (; page && ({ prefetch(page_chain_next(page)); 1; }); \ | |
1720 | page = page_chain_next(page)) | |
1721 | #define page_chain_for_each_safe(page, n) \ | |
1722 | for (; page && ({ n = page_chain_next(page); 1; }); page = n) | |
1723 | ||
45bb912b | 1724 | |
045417f7 | 1725 | static inline int drbd_peer_req_has_active_page(struct drbd_peer_request *peer_req) |
45bb912b | 1726 | { |
db830c46 | 1727 | struct page *page = peer_req->pages; |
45bb912b LE |
1728 | page_chain_for_each(page) { |
1729 | if (page_count(page) > 1) | |
1730 | return 1; | |
1731 | } | |
1732 | return 0; | |
1733 | } | |
1734 | ||
b30ab791 | 1735 | static inline union drbd_state drbd_read_state(struct drbd_device *device) |
b411b363 | 1736 | { |
6bbf53ca | 1737 | struct drbd_resource *resource = device->resource; |
78bae59b PR |
1738 | union drbd_state rv; |
1739 | ||
b30ab791 | 1740 | rv.i = device->state.i; |
6bbf53ca AG |
1741 | rv.susp = resource->susp; |
1742 | rv.susp_nod = resource->susp_nod; | |
1743 | rv.susp_fen = resource->susp_fen; | |
78bae59b PR |
1744 | |
1745 | return rv; | |
b411b363 PR |
1746 | } |
1747 | ||
383606e0 | 1748 | enum drbd_force_detach_flags { |
a2a3c74f LE |
1749 | DRBD_READ_ERROR, |
1750 | DRBD_WRITE_ERROR, | |
383606e0 LE |
1751 | DRBD_META_IO_ERROR, |
1752 | DRBD_FORCE_DETACH, | |
1753 | }; | |
1754 | ||
b411b363 | 1755 | #define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__) |
b30ab791 | 1756 | static inline void __drbd_chk_io_error_(struct drbd_device *device, |
a2a3c74f | 1757 | enum drbd_force_detach_flags df, |
383606e0 | 1758 | const char *where) |
b411b363 | 1759 | { |
daeda1cc PR |
1760 | enum drbd_io_error_p ep; |
1761 | ||
1762 | rcu_read_lock(); | |
b30ab791 | 1763 | ep = rcu_dereference(device->ldev->disk_conf)->on_io_error; |
daeda1cc PR |
1764 | rcu_read_unlock(); |
1765 | switch (ep) { | |
1766 | case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */ | |
a2a3c74f | 1767 | if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) { |
7383506c | 1768 | if (__ratelimit(&drbd_ratelimit_state)) |
d0180171 | 1769 | drbd_err(device, "Local IO failed in %s.\n", where); |
b30ab791 AG |
1770 | if (device->state.disk > D_INCONSISTENT) |
1771 | _drbd_set_state(_NS(device, disk, D_INCONSISTENT), CS_HARD, NULL); | |
b411b363 PR |
1772 | break; |
1773 | } | |
a2a3c74f | 1774 | /* NOTE fall through for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */ |
b411b363 PR |
1775 | case EP_DETACH: |
1776 | case EP_CALL_HELPER: | |
a2a3c74f LE |
1777 | /* Remember whether we saw a READ or WRITE error. |
1778 | * | |
1779 | * Recovery of the affected area for WRITE failure is covered | |
1780 | * by the activity log. | |
1781 | * READ errors may fall outside that area though. Certain READ | |
1782 | * errors can be "healed" by writing good data to the affected | |
1783 | * blocks, which triggers block re-allocation in lower layers. | |
1784 | * | |
1785 | * If we can not write the bitmap after a READ error, | |
1786 | * we may need to trigger a full sync (see w_go_diskless()). | |
1787 | * | |
1788 | * Force-detach is not really an IO error, but rather a | |
1789 | * desperate measure to try to deal with a completely | |
1790 | * unresponsive lower level IO stack. | |
1791 | * Still it should be treated as a WRITE error. | |
1792 | * | |
1793 | * Meta IO error is always WRITE error: | |
1794 | * we read meta data only once during attach, | |
1795 | * which will fail in case of errors. | |
1796 | */ | |
b30ab791 | 1797 | set_bit(WAS_IO_ERROR, &device->flags); |
a2a3c74f | 1798 | if (df == DRBD_READ_ERROR) |
b30ab791 | 1799 | set_bit(WAS_READ_ERROR, &device->flags); |
a2a3c74f | 1800 | if (df == DRBD_FORCE_DETACH) |
b30ab791 AG |
1801 | set_bit(FORCE_DETACH, &device->flags); |
1802 | if (device->state.disk > D_FAILED) { | |
1803 | _drbd_set_state(_NS(device, disk, D_FAILED), CS_HARD, NULL); | |
d0180171 | 1804 | drbd_err(device, |
82f59cc6 | 1805 | "Local IO failed in %s. Detaching...\n", where); |
b411b363 PR |
1806 | } |
1807 | break; | |
1808 | } | |
1809 | } | |
1810 | ||
1811 | /** | |
1812 | * drbd_chk_io_error: Handle the on_io_error setting, should be called from all io completion handlers | |
b30ab791 | 1813 | * @device: DRBD device. |
b411b363 PR |
1814 | * @error: Error code passed to the IO completion callback |
1815 | * @forcedetach: Force detach. I.e. the error happened while accessing the meta data | |
1816 | * | |
1817 | * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED) | |
1818 | */ | |
1819 | #define drbd_chk_io_error(m,e,f) drbd_chk_io_error_(m,e,f, __func__) | |
b30ab791 | 1820 | static inline void drbd_chk_io_error_(struct drbd_device *device, |
383606e0 | 1821 | int error, enum drbd_force_detach_flags forcedetach, const char *where) |
b411b363 PR |
1822 | { |
1823 | if (error) { | |
1824 | unsigned long flags; | |
0500813f | 1825 | spin_lock_irqsave(&device->resource->req_lock, flags); |
b30ab791 | 1826 | __drbd_chk_io_error_(device, forcedetach, where); |
0500813f | 1827 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
b411b363 PR |
1828 | } |
1829 | } | |
1830 | ||
1831 | ||
1832 | /** | |
1833 | * drbd_md_first_sector() - Returns the first sector number of the meta data area | |
1834 | * @bdev: Meta data block device. | |
1835 | * | |
1836 | * BTW, for internal meta data, this happens to be the maximum capacity | |
1837 | * we could agree upon with our peer node. | |
1838 | */ | |
68e41a43 | 1839 | static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev) |
b411b363 | 1840 | { |
68e41a43 | 1841 | switch (bdev->md.meta_dev_idx) { |
b411b363 PR |
1842 | case DRBD_MD_INDEX_INTERNAL: |
1843 | case DRBD_MD_INDEX_FLEX_INT: | |
1844 | return bdev->md.md_offset + bdev->md.bm_offset; | |
1845 | case DRBD_MD_INDEX_FLEX_EXT: | |
1846 | default: | |
1847 | return bdev->md.md_offset; | |
1848 | } | |
1849 | } | |
1850 | ||
1851 | /** | |
1852 | * drbd_md_last_sector() - Return the last sector number of the meta data area | |
1853 | * @bdev: Meta data block device. | |
1854 | */ | |
1855 | static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev) | |
1856 | { | |
68e41a43 | 1857 | switch (bdev->md.meta_dev_idx) { |
b411b363 PR |
1858 | case DRBD_MD_INDEX_INTERNAL: |
1859 | case DRBD_MD_INDEX_FLEX_INT: | |
ae8bf312 | 1860 | return bdev->md.md_offset + MD_4kB_SECT -1; |
b411b363 PR |
1861 | case DRBD_MD_INDEX_FLEX_EXT: |
1862 | default: | |
ae8bf312 | 1863 | return bdev->md.md_offset + bdev->md.md_size_sect -1; |
b411b363 PR |
1864 | } |
1865 | } | |
1866 | ||
1867 | /* Returns the number of 512 byte sectors of the device */ | |
1868 | static inline sector_t drbd_get_capacity(struct block_device *bdev) | |
1869 | { | |
1870 | /* return bdev ? get_capacity(bdev->bd_disk) : 0; */ | |
77304d2a | 1871 | return bdev ? i_size_read(bdev->bd_inode) >> 9 : 0; |
b411b363 PR |
1872 | } |
1873 | ||
1874 | /** | |
1875 | * drbd_get_max_capacity() - Returns the capacity we announce to out peer | |
1876 | * @bdev: Meta data block device. | |
1877 | * | |
1878 | * returns the capacity we announce to out peer. we clip ourselves at the | |
1879 | * various MAX_SECTORS, because if we don't, current implementation will | |
1880 | * oops sooner or later | |
1881 | */ | |
1882 | static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) | |
1883 | { | |
1884 | sector_t s; | |
daeda1cc | 1885 | |
68e41a43 | 1886 | switch (bdev->md.meta_dev_idx) { |
b411b363 PR |
1887 | case DRBD_MD_INDEX_INTERNAL: |
1888 | case DRBD_MD_INDEX_FLEX_INT: | |
1889 | s = drbd_get_capacity(bdev->backing_bdev) | |
1890 | ? min_t(sector_t, DRBD_MAX_SECTORS_FLEX, | |
68e41a43 | 1891 | drbd_md_first_sector(bdev)) |
b411b363 PR |
1892 | : 0; |
1893 | break; | |
1894 | case DRBD_MD_INDEX_FLEX_EXT: | |
1895 | s = min_t(sector_t, DRBD_MAX_SECTORS_FLEX, | |
1896 | drbd_get_capacity(bdev->backing_bdev)); | |
1897 | /* clip at maximum size the meta device can support */ | |
1898 | s = min_t(sector_t, s, | |
1899 | BM_EXT_TO_SECT(bdev->md.md_size_sect | |
1900 | - bdev->md.bm_offset)); | |
1901 | break; | |
1902 | default: | |
1903 | s = min_t(sector_t, DRBD_MAX_SECTORS, | |
1904 | drbd_get_capacity(bdev->backing_bdev)); | |
1905 | } | |
1906 | return s; | |
1907 | } | |
1908 | ||
1909 | /** | |
3a4d4eb3 | 1910 | * drbd_md_ss() - Return the sector number of our meta data super block |
b411b363 PR |
1911 | * @bdev: Meta data block device. |
1912 | */ | |
3a4d4eb3 | 1913 | static inline sector_t drbd_md_ss(struct drbd_backing_dev *bdev) |
b411b363 | 1914 | { |
3a4d4eb3 | 1915 | const int meta_dev_idx = bdev->md.meta_dev_idx; |
daeda1cc | 1916 | |
3a4d4eb3 LE |
1917 | if (meta_dev_idx == DRBD_MD_INDEX_FLEX_EXT) |
1918 | return 0; | |
daeda1cc | 1919 | |
3a4d4eb3 LE |
1920 | /* Since drbd08, internal meta data is always "flexible". |
1921 | * position: last 4k aligned block of 4k size */ | |
1922 | if (meta_dev_idx == DRBD_MD_INDEX_INTERNAL || | |
1923 | meta_dev_idx == DRBD_MD_INDEX_FLEX_INT) | |
ae8bf312 | 1924 | return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) - 8; |
3a4d4eb3 LE |
1925 | |
1926 | /* external, some index; this is the old fixed size layout */ | |
1927 | return MD_128MB_SECT * bdev->md.meta_dev_idx; | |
b411b363 PR |
1928 | } |
1929 | ||
b411b363 PR |
1930 | static inline void |
1931 | drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) | |
1932 | { | |
1933 | unsigned long flags; | |
1934 | spin_lock_irqsave(&q->q_lock, flags); | |
1935 | list_add_tail(&w->list, &q->q); | |
b411b363 | 1936 | spin_unlock_irqrestore(&q->q_lock, flags); |
8c0785a5 | 1937 | wake_up(&q->q_wait); |
b411b363 PR |
1938 | } |
1939 | ||
15e26f6a LE |
1940 | static inline void |
1941 | drbd_queue_work_if_unqueued(struct drbd_work_queue *q, struct drbd_work *w) | |
1942 | { | |
1943 | unsigned long flags; | |
1944 | spin_lock_irqsave(&q->q_lock, flags); | |
1945 | if (list_empty_careful(&w->list)) | |
1946 | list_add_tail(&w->list, &q->q); | |
1947 | spin_unlock_irqrestore(&q->q_lock, flags); | |
1948 | wake_up(&q->q_wait); | |
1949 | } | |
1950 | ||
e334f550 LE |
1951 | static inline void |
1952 | drbd_device_post_work(struct drbd_device *device, int work_bit) | |
1953 | { | |
1954 | if (!test_and_set_bit(work_bit, &device->flags)) { | |
1955 | struct drbd_connection *connection = | |
1956 | first_peer_device(device)->connection; | |
1957 | struct drbd_work_queue *q = &connection->sender_work; | |
1958 | if (!test_and_set_bit(DEVICE_WORK_PENDING, &connection->flags)) | |
1959 | wake_up(&q->q_wait); | |
1960 | } | |
1961 | } | |
1962 | ||
b5043c5e AG |
1963 | extern void drbd_flush_workqueue(struct drbd_work_queue *work_queue); |
1964 | ||
668700b4 PR |
1965 | /* To get the ack_receiver out of the blocking network stack, |
1966 | * so it can change its sk_rcvtimeo from idle- to ping-timeout, | |
1967 | * and send a ping, we need to send a signal. | |
1968 | * Which signal we send is irrelevant. */ | |
1969 | static inline void wake_ack_receiver(struct drbd_connection *connection) | |
b411b363 | 1970 | { |
668700b4 PR |
1971 | struct task_struct *task = connection->ack_receiver.task; |
1972 | if (task && get_t_state(&connection->ack_receiver) == RUNNING) | |
1973 | force_sig(SIGXCPU, task); | |
b411b363 PR |
1974 | } |
1975 | ||
bde89a9e | 1976 | static inline void request_ping(struct drbd_connection *connection) |
b411b363 | 1977 | { |
bde89a9e | 1978 | set_bit(SEND_PING, &connection->flags); |
668700b4 | 1979 | wake_ack_receiver(connection); |
b411b363 PR |
1980 | } |
1981 | ||
bde89a9e | 1982 | extern void *conn_prepare_command(struct drbd_connection *, struct drbd_socket *); |
69a22773 | 1983 | extern void *drbd_prepare_command(struct drbd_peer_device *, struct drbd_socket *); |
bde89a9e | 1984 | extern int conn_send_command(struct drbd_connection *, struct drbd_socket *, |
dba58587 AG |
1985 | enum drbd_packet, unsigned int, void *, |
1986 | unsigned int); | |
69a22773 | 1987 | extern int drbd_send_command(struct drbd_peer_device *, struct drbd_socket *, |
dba58587 AG |
1988 | enum drbd_packet, unsigned int, void *, |
1989 | unsigned int); | |
b411b363 | 1990 | |
bde89a9e AG |
1991 | extern int drbd_send_ping(struct drbd_connection *connection); |
1992 | extern int drbd_send_ping_ack(struct drbd_connection *connection); | |
69a22773 | 1993 | extern int drbd_send_state_req(struct drbd_peer_device *, union drbd_state, union drbd_state); |
bde89a9e | 1994 | extern int conn_send_state_req(struct drbd_connection *, union drbd_state, union drbd_state); |
b411b363 PR |
1995 | |
1996 | static inline void drbd_thread_stop(struct drbd_thread *thi) | |
1997 | { | |
81e84650 | 1998 | _drbd_thread_stop(thi, false, true); |
b411b363 PR |
1999 | } |
2000 | ||
2001 | static inline void drbd_thread_stop_nowait(struct drbd_thread *thi) | |
2002 | { | |
81e84650 | 2003 | _drbd_thread_stop(thi, false, false); |
b411b363 PR |
2004 | } |
2005 | ||
2006 | static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) | |
2007 | { | |
81e84650 | 2008 | _drbd_thread_stop(thi, true, false); |
b411b363 PR |
2009 | } |
2010 | ||
2011 | /* counts how many answer packets packets we expect from our peer, | |
2012 | * for either explicit application requests, | |
2013 | * or implicit barrier packets as necessary. | |
2014 | * increased: | |
2015 | * w_send_barrier | |
8554df1c | 2016 | * _req_mod(req, QUEUE_FOR_NET_WRITE or QUEUE_FOR_NET_READ); |
b411b363 PR |
2017 | * it is much easier and equally valid to count what we queue for the |
2018 | * worker, even before it actually was queued or send. | |
2019 | * (drbd_make_request_common; recovery path on read io-error) | |
2020 | * decreased: | |
2021 | * got_BarrierAck (respective tl_clear, tl_clear_barrier) | |
8554df1c | 2022 | * _req_mod(req, DATA_RECEIVED) |
b411b363 | 2023 | * [from receive_DataReply] |
8554df1c | 2024 | * _req_mod(req, WRITE_ACKED_BY_PEER or RECV_ACKED_BY_PEER or NEG_ACKED) |
b411b363 PR |
2025 | * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)] |
2026 | * for some reason it is NOT decreased in got_NegAck, | |
2027 | * but in the resulting cleanup code from report_params. | |
2028 | * we should try to remember the reason for that... | |
8554df1c AG |
2029 | * _req_mod(req, SEND_FAILED or SEND_CANCELED) |
2030 | * _req_mod(req, CONNECTION_LOST_WHILE_PENDING) | |
b411b363 PR |
2031 | * [from tl_clear_barrier] |
2032 | */ | |
b30ab791 | 2033 | static inline void inc_ap_pending(struct drbd_device *device) |
b411b363 | 2034 | { |
b30ab791 | 2035 | atomic_inc(&device->ap_pending_cnt); |
b411b363 PR |
2036 | } |
2037 | ||
49559d87 | 2038 | #define ERR_IF_CNT_IS_NEGATIVE(which, func, line) \ |
b30ab791 | 2039 | if (atomic_read(&device->which) < 0) \ |
d0180171 | 2040 | drbd_err(device, "in %s:%d: " #which " = %d < 0 !\n", \ |
49559d87 | 2041 | func, line, \ |
b30ab791 | 2042 | atomic_read(&device->which)) |
b411b363 | 2043 | |
659b2e3b | 2044 | #define dec_ap_pending(device) _dec_ap_pending(device, __func__, __LINE__) |
b30ab791 | 2045 | static inline void _dec_ap_pending(struct drbd_device *device, const char *func, int line) |
49559d87 | 2046 | { |
b30ab791 AG |
2047 | if (atomic_dec_and_test(&device->ap_pending_cnt)) |
2048 | wake_up(&device->misc_wait); | |
49559d87 PR |
2049 | ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt, func, line); |
2050 | } | |
b411b363 PR |
2051 | |
2052 | /* counts how many resync-related answers we still expect from the peer | |
2053 | * increase decrease | |
2054 | * C_SYNC_TARGET sends P_RS_DATA_REQUEST (and expects P_RS_DATA_REPLY) | |
25985edc | 2055 | * C_SYNC_SOURCE sends P_RS_DATA_REPLY (and expects P_WRITE_ACK with ID_SYNCER) |
b411b363 PR |
2056 | * (or P_NEG_ACK with ID_SYNCER) |
2057 | */ | |
b30ab791 | 2058 | static inline void inc_rs_pending(struct drbd_device *device) |
b411b363 | 2059 | { |
b30ab791 | 2060 | atomic_inc(&device->rs_pending_cnt); |
b411b363 PR |
2061 | } |
2062 | ||
659b2e3b | 2063 | #define dec_rs_pending(device) _dec_rs_pending(device, __func__, __LINE__) |
b30ab791 | 2064 | static inline void _dec_rs_pending(struct drbd_device *device, const char *func, int line) |
49559d87 | 2065 | { |
b30ab791 | 2066 | atomic_dec(&device->rs_pending_cnt); |
49559d87 PR |
2067 | ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt, func, line); |
2068 | } | |
b411b363 PR |
2069 | |
2070 | /* counts how many answers we still need to send to the peer. | |
2071 | * increased on | |
2072 | * receive_Data unless protocol A; | |
2073 | * we need to send a P_RECV_ACK (proto B) | |
2074 | * or P_WRITE_ACK (proto C) | |
2075 | * receive_RSDataReply (recv_resync_read) we need to send a P_WRITE_ACK | |
2076 | * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA | |
2077 | * receive_Barrier_* we need to send a P_BARRIER_ACK | |
2078 | */ | |
b30ab791 | 2079 | static inline void inc_unacked(struct drbd_device *device) |
b411b363 | 2080 | { |
b30ab791 | 2081 | atomic_inc(&device->unacked_cnt); |
b411b363 PR |
2082 | } |
2083 | ||
659b2e3b | 2084 | #define dec_unacked(device) _dec_unacked(device, __func__, __LINE__) |
b30ab791 | 2085 | static inline void _dec_unacked(struct drbd_device *device, const char *func, int line) |
b411b363 | 2086 | { |
b30ab791 | 2087 | atomic_dec(&device->unacked_cnt); |
49559d87 | 2088 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); |
b411b363 PR |
2089 | } |
2090 | ||
659b2e3b | 2091 | #define sub_unacked(device, n) _sub_unacked(device, n, __func__, __LINE__) |
b30ab791 | 2092 | static inline void _sub_unacked(struct drbd_device *device, int n, const char *func, int line) |
b411b363 | 2093 | { |
b30ab791 | 2094 | atomic_sub(n, &device->unacked_cnt); |
49559d87 | 2095 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); |
b411b363 PR |
2096 | } |
2097 | ||
5ab7d2c0 LE |
2098 | static inline bool is_sync_state(enum drbd_conns connection_state) |
2099 | { | |
2100 | return | |
2101 | (connection_state == C_SYNC_SOURCE | |
2102 | || connection_state == C_SYNC_TARGET | |
2103 | || connection_state == C_PAUSED_SYNC_S | |
2104 | || connection_state == C_PAUSED_SYNC_T); | |
2105 | } | |
2106 | ||
b411b363 | 2107 | /** |
b30ab791 | 2108 | * get_ldev() - Increase the ref count on device->ldev. Returns 0 if there is no ldev |
d1b80853 AG |
2109 | * @_device: DRBD device. |
2110 | * @_min_state: Minimum device state required for success. | |
b411b363 | 2111 | * |
b30ab791 | 2112 | * You have to call put_ldev() when finished working with device->ldev. |
b411b363 | 2113 | */ |
d1b80853 AG |
2114 | #define get_ldev_if_state(_device, _min_state) \ |
2115 | (_get_ldev_if_state((_device), (_min_state)) ? \ | |
2116 | ({ __acquire(x); true; }) : false) | |
2117 | #define get_ldev(_device) get_ldev_if_state(_device, D_INCONSISTENT) | |
b411b363 | 2118 | |
b30ab791 | 2119 | static inline void put_ldev(struct drbd_device *device) |
b411b363 | 2120 | { |
11f8b2b6 | 2121 | enum drbd_disk_state disk_state = device->state.disk; |
ba3c6fb8 LE |
2122 | /* We must check the state *before* the atomic_dec becomes visible, |
2123 | * or we have a theoretical race where someone hitting zero, | |
2124 | * while state still D_FAILED, will then see D_DISKLESS in the | |
2125 | * condition below and calling into destroy, where he must not, yet. */ | |
b30ab791 | 2126 | int i = atomic_dec_return(&device->local_cnt); |
9a0d9d03 LE |
2127 | |
2128 | /* This may be called from some endio handler, | |
2129 | * so we must not sleep here. */ | |
2130 | ||
b411b363 | 2131 | __release(local); |
0b0ba1ef | 2132 | D_ASSERT(device, i >= 0); |
e9e6f3ec | 2133 | if (i == 0) { |
11f8b2b6 | 2134 | if (disk_state == D_DISKLESS) |
82f59cc6 | 2135 | /* even internal references gone, safe to destroy */ |
e334f550 | 2136 | drbd_device_post_work(device, DESTROY_DISK); |
11f8b2b6 | 2137 | if (disk_state == D_FAILED) |
82f59cc6 | 2138 | /* all application IO references gone. */ |
e334f550 LE |
2139 | if (!test_and_set_bit(GOING_DISKLESS, &device->flags)) |
2140 | drbd_device_post_work(device, GO_DISKLESS); | |
b30ab791 | 2141 | wake_up(&device->misc_wait); |
e9e6f3ec | 2142 | } |
b411b363 PR |
2143 | } |
2144 | ||
2145 | #ifndef __CHECKER__ | |
b30ab791 | 2146 | static inline int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins) |
b411b363 PR |
2147 | { |
2148 | int io_allowed; | |
2149 | ||
82f59cc6 | 2150 | /* never get a reference while D_DISKLESS */ |
b30ab791 | 2151 | if (device->state.disk == D_DISKLESS) |
82f59cc6 LE |
2152 | return 0; |
2153 | ||
b30ab791 AG |
2154 | atomic_inc(&device->local_cnt); |
2155 | io_allowed = (device->state.disk >= mins); | |
b411b363 | 2156 | if (!io_allowed) |
b30ab791 | 2157 | put_ldev(device); |
b411b363 PR |
2158 | return io_allowed; |
2159 | } | |
2160 | #else | |
b30ab791 | 2161 | extern int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins); |
b411b363 PR |
2162 | #endif |
2163 | ||
b411b363 PR |
2164 | /* this throttles on-the-fly application requests |
2165 | * according to max_buffers settings; | |
2166 | * maybe re-implement using semaphores? */ | |
b30ab791 | 2167 | static inline int drbd_get_max_buffers(struct drbd_device *device) |
b411b363 | 2168 | { |
44ed167d PR |
2169 | struct net_conf *nc; |
2170 | int mxb; | |
2171 | ||
2172 | rcu_read_lock(); | |
a6b32bc3 | 2173 | nc = rcu_dereference(first_peer_device(device)->connection->net_conf); |
44ed167d PR |
2174 | mxb = nc ? nc->max_buffers : 1000000; /* arbitrary limit on open requests */ |
2175 | rcu_read_unlock(); | |
2176 | ||
b411b363 PR |
2177 | return mxb; |
2178 | } | |
2179 | ||
b30ab791 | 2180 | static inline int drbd_state_is_stable(struct drbd_device *device) |
b411b363 | 2181 | { |
b30ab791 | 2182 | union drbd_dev_state s = device->state; |
b411b363 PR |
2183 | |
2184 | /* DO NOT add a default clause, we want the compiler to warn us | |
2185 | * for any newly introduced state we may have forgotten to add here */ | |
2186 | ||
2187 | switch ((enum drbd_conns)s.conn) { | |
2188 | /* new io only accepted when there is no connection, ... */ | |
2189 | case C_STANDALONE: | |
2190 | case C_WF_CONNECTION: | |
2191 | /* ... or there is a well established connection. */ | |
2192 | case C_CONNECTED: | |
2193 | case C_SYNC_SOURCE: | |
2194 | case C_SYNC_TARGET: | |
2195 | case C_VERIFY_S: | |
2196 | case C_VERIFY_T: | |
2197 | case C_PAUSED_SYNC_S: | |
2198 | case C_PAUSED_SYNC_T: | |
67531718 PR |
2199 | case C_AHEAD: |
2200 | case C_BEHIND: | |
3719094e | 2201 | /* transitional states, IO allowed */ |
b411b363 PR |
2202 | case C_DISCONNECTING: |
2203 | case C_UNCONNECTED: | |
2204 | case C_TIMEOUT: | |
2205 | case C_BROKEN_PIPE: | |
2206 | case C_NETWORK_FAILURE: | |
2207 | case C_PROTOCOL_ERROR: | |
2208 | case C_TEAR_DOWN: | |
2209 | case C_WF_REPORT_PARAMS: | |
2210 | case C_STARTING_SYNC_S: | |
2211 | case C_STARTING_SYNC_T: | |
3719094e PR |
2212 | break; |
2213 | ||
2214 | /* Allow IO in BM exchange states with new protocols */ | |
b411b363 | 2215 | case C_WF_BITMAP_S: |
a6b32bc3 | 2216 | if (first_peer_device(device)->connection->agreed_pro_version < 96) |
3719094e PR |
2217 | return 0; |
2218 | break; | |
2219 | ||
2220 | /* no new io accepted in these states */ | |
b411b363 PR |
2221 | case C_WF_BITMAP_T: |
2222 | case C_WF_SYNC_UUID: | |
2223 | case C_MASK: | |
2224 | /* not "stable" */ | |
2225 | return 0; | |
2226 | } | |
2227 | ||
2228 | switch ((enum drbd_disk_state)s.disk) { | |
2229 | case D_DISKLESS: | |
2230 | case D_INCONSISTENT: | |
2231 | case D_OUTDATED: | |
2232 | case D_CONSISTENT: | |
2233 | case D_UP_TO_DATE: | |
5ca1de03 | 2234 | case D_FAILED: |
b411b363 PR |
2235 | /* disk state is stable as well. */ |
2236 | break; | |
2237 | ||
d942ae44 | 2238 | /* no new io accepted during transitional states */ |
b411b363 | 2239 | case D_ATTACHING: |
b411b363 PR |
2240 | case D_NEGOTIATING: |
2241 | case D_UNKNOWN: | |
2242 | case D_MASK: | |
2243 | /* not "stable" */ | |
2244 | return 0; | |
2245 | } | |
2246 | ||
2247 | return 1; | |
2248 | } | |
2249 | ||
b30ab791 | 2250 | static inline int drbd_suspended(struct drbd_device *device) |
fb22c402 | 2251 | { |
6bbf53ca | 2252 | struct drbd_resource *resource = device->resource; |
8e0af25f | 2253 | |
6bbf53ca | 2254 | return resource->susp || resource->susp_fen || resource->susp_nod; |
fb22c402 PR |
2255 | } |
2256 | ||
b30ab791 | 2257 | static inline bool may_inc_ap_bio(struct drbd_device *device) |
b411b363 | 2258 | { |
b30ab791 | 2259 | int mxb = drbd_get_max_buffers(device); |
b411b363 | 2260 | |
b30ab791 | 2261 | if (drbd_suspended(device)) |
1b881ef7 | 2262 | return false; |
7dbb4386 | 2263 | if (atomic_read(&device->suspend_cnt)) |
1b881ef7 | 2264 | return false; |
b411b363 PR |
2265 | |
2266 | /* to avoid potential deadlock or bitmap corruption, | |
2267 | * in various places, we only allow new application io | |
2268 | * to start during "stable" states. */ | |
2269 | ||
2270 | /* no new io accepted when attaching or detaching the disk */ | |
b30ab791 | 2271 | if (!drbd_state_is_stable(device)) |
1b881ef7 | 2272 | return false; |
b411b363 PR |
2273 | |
2274 | /* since some older kernels don't have atomic_add_unless, | |
2275 | * and we are within the spinlock anyways, we have this workaround. */ | |
b30ab791 | 2276 | if (atomic_read(&device->ap_bio_cnt) > mxb) |
1b881ef7 | 2277 | return false; |
b30ab791 | 2278 | if (test_bit(BITMAP_IO, &device->flags)) |
1b881ef7 AG |
2279 | return false; |
2280 | return true; | |
b411b363 PR |
2281 | } |
2282 | ||
b30ab791 | 2283 | static inline bool inc_ap_bio_cond(struct drbd_device *device) |
b411b363 | 2284 | { |
1b881ef7 | 2285 | bool rv = false; |
8869d683 | 2286 | |
0500813f | 2287 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 2288 | rv = may_inc_ap_bio(device); |
8869d683 | 2289 | if (rv) |
b30ab791 | 2290 | atomic_inc(&device->ap_bio_cnt); |
0500813f | 2291 | spin_unlock_irq(&device->resource->req_lock); |
8869d683 PR |
2292 | |
2293 | return rv; | |
2294 | } | |
b411b363 | 2295 | |
b30ab791 | 2296 | static inline void inc_ap_bio(struct drbd_device *device) |
8869d683 | 2297 | { |
b411b363 PR |
2298 | /* we wait here |
2299 | * as long as the device is suspended | |
2300 | * until the bitmap is no longer on the fly during connection | |
d942ae44 | 2301 | * handshake as long as we would exceed the max_buffer limit. |
b411b363 PR |
2302 | * |
2303 | * to avoid races with the reconnect code, | |
2304 | * we need to atomic_inc within the spinlock. */ | |
2305 | ||
b30ab791 | 2306 | wait_event(device->misc_wait, inc_ap_bio_cond(device)); |
b411b363 PR |
2307 | } |
2308 | ||
b30ab791 | 2309 | static inline void dec_ap_bio(struct drbd_device *device) |
b411b363 | 2310 | { |
b30ab791 AG |
2311 | int mxb = drbd_get_max_buffers(device); |
2312 | int ap_bio = atomic_dec_return(&device->ap_bio_cnt); | |
b411b363 | 2313 | |
0b0ba1ef | 2314 | D_ASSERT(device, ap_bio >= 0); |
7ee1fb93 | 2315 | |
b30ab791 AG |
2316 | if (ap_bio == 0 && test_bit(BITMAP_IO, &device->flags)) { |
2317 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags)) | |
84b8c06b AG |
2318 | drbd_queue_work(&first_peer_device(device)-> |
2319 | connection->sender_work, | |
2320 | &device->bm_io_work.w); | |
7ee1fb93 LE |
2321 | } |
2322 | ||
b411b363 PR |
2323 | /* this currently does wake_up for every dec_ap_bio! |
2324 | * maybe rather introduce some type of hysteresis? | |
2325 | * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ | |
2326 | if (ap_bio < mxb) | |
b30ab791 | 2327 | wake_up(&device->misc_wait); |
b411b363 PR |
2328 | } |
2329 | ||
b30ab791 | 2330 | static inline bool verify_can_do_stop_sector(struct drbd_device *device) |
58ffa580 | 2331 | { |
a6b32bc3 AG |
2332 | return first_peer_device(device)->connection->agreed_pro_version >= 97 && |
2333 | first_peer_device(device)->connection->agreed_pro_version != 100; | |
58ffa580 LE |
2334 | } |
2335 | ||
b30ab791 | 2336 | static inline int drbd_set_ed_uuid(struct drbd_device *device, u64 val) |
b411b363 | 2337 | { |
b30ab791 AG |
2338 | int changed = device->ed_uuid != val; |
2339 | device->ed_uuid = val; | |
62b0da3a | 2340 | return changed; |
b411b363 PR |
2341 | } |
2342 | ||
b30ab791 | 2343 | static inline int drbd_queue_order_type(struct drbd_device *device) |
b411b363 PR |
2344 | { |
2345 | /* sorry, we currently have no working implementation | |
2346 | * of distributed TCQ stuff */ | |
2347 | #ifndef QUEUE_ORDERED_NONE | |
2348 | #define QUEUE_ORDERED_NONE 0 | |
2349 | #endif | |
2350 | return QUEUE_ORDERED_NONE; | |
2351 | } | |
2352 | ||
77c556f6 AG |
2353 | static inline struct drbd_connection *first_connection(struct drbd_resource *resource) |
2354 | { | |
ec4a3407 | 2355 | return list_first_entry_or_null(&resource->connections, |
77c556f6 AG |
2356 | struct drbd_connection, connections); |
2357 | } | |
2358 | ||
b411b363 | 2359 | #endif |