Christoph Böhmwalder | 93c68cc | 2022-11-22 14:43:01 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2 | /* |
| 3 | drbd_int.h |
| 4 | |
| 5 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| 6 | |
| 7 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
| 8 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| 9 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| 10 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 11 | |
| 12 | */ |
| 13 | |
| 14 | #ifndef _DRBD_INT_H |
| 15 | #define _DRBD_INT_H |
| 16 | |
Herbert Xu | 9534d67 | 2016-01-24 21:19:21 +0800 | [diff] [blame] | 17 | #include <crypto/hash.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 18 | #include <linux/compiler.h> |
| 19 | #include <linux/types.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 20 | #include <linux/list.h> |
Ingo Molnar | 3f07c01 | 2017-02-08 18:51:30 +0100 | [diff] [blame] | 21 | #include <linux/sched/signal.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 22 | #include <linux/bitops.h> |
| 23 | #include <linux/slab.h> |
Randy Dunlap | 132cc53 | 2009-10-07 19:26:00 +0200 | [diff] [blame] | 24 | #include <linux/ratelimit.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 25 | #include <linux/tcp.h> |
| 26 | #include <linux/mutex.h> |
| 27 | #include <linux/major.h> |
| 28 | #include <linux/blkdev.h> |
Tejun Heo | 66114ca | 2015-05-22 17:13:32 -0400 | [diff] [blame] | 29 | #include <linux/backing-dev.h> |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 30 | #include <linux/idr.h> |
Luis de Bethencourt | 9d5059c | 2016-08-02 14:03:47 -0700 | [diff] [blame] | 31 | #include <linux/dynamic_debug.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 32 | #include <net/tcp.h> |
| 33 | #include <linux/lru_cache.h> |
Paul Gortmaker | 70c7160 | 2011-05-22 16:47:17 -0400 | [diff] [blame] | 34 | #include <linux/prefetch.h> |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 35 | #include <linux/drbd_genl_api.h> |
Philipp Reisner | b890733 | 2011-01-27 14:07:51 +0100 | [diff] [blame] | 36 | #include <linux/drbd.h> |
Christoph Böhmwalder | 20f2a34 | 2023-01-13 13:35:06 +0100 | [diff] [blame] | 37 | #include <linux/drbd_config.h> |
Andreas Gruenbacher | d9f6522 | 2011-09-01 13:18:31 +0200 | [diff] [blame] | 38 | #include "drbd_strings.h" |
Philipp Reisner | b890733 | 2011-01-27 14:07:51 +0100 | [diff] [blame] | 39 | #include "drbd_state.h" |
Andreas Gruenbacher | a3603a6 | 2011-05-30 11:47:37 +0200 | [diff] [blame] | 40 | #include "drbd_protocol.h" |
Christoph Böhmwalder | 136160c | 2022-12-01 12:03:47 +0100 | [diff] [blame] | 41 | #include "drbd_polymorph_printk.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 42 | |
Roland Kammerer | 183ece3 | 2017-08-29 10:20:46 +0200 | [diff] [blame] | 43 | /* shared module parameters, defined in drbd_main.c */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 44 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
Roland Kammerer | 183ece3 | 2017-08-29 10:20:46 +0200 | [diff] [blame] | 45 | extern int drbd_enable_faults; |
| 46 | extern int drbd_fault_rate; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 47 | #endif |
| 48 | |
Roland Kammerer | 183ece3 | 2017-08-29 10:20:46 +0200 | [diff] [blame] | 49 | extern unsigned int drbd_minor_count; |
Greg Kroah-Hartman | 8ab761e | 2017-08-29 10:20:45 +0200 | [diff] [blame] | 50 | extern char drbd_usermode_helper[]; |
Roland Kammerer | 183ece3 | 2017-08-29 10:20:46 +0200 | [diff] [blame] | 51 | extern int drbd_proc_details; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 52 | |
| 53 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 54 | /* This is used to stop/restart our threads. |
| 55 | * Cannot use SIGTERM nor SIGKILL, since these |
| 56 | * are sent out by init on runlevel changes |
| 57 | * I choose SIGHUP for now. |
| 58 | */ |
| 59 | #define DRBD_SIGKILL SIGHUP |
| 60 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 61 | #define ID_IN_SYNC (4711ULL) |
| 62 | #define ID_OUT_OF_SYNC (4712ULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 63 | #define ID_SYNCER (-1ULL) |
Andreas Gruenbacher | 579b57e | 2011-01-13 18:40:57 +0100 | [diff] [blame] | 64 | |
Philipp Reisner | 4a23f26 | 2011-01-11 17:42:17 +0100 | [diff] [blame] | 65 | #define UUID_NEW_BM_OFFSET ((u64)0x0001000000000000ULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 66 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 67 | struct drbd_device; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 68 | struct drbd_connection; |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 69 | struct drbd_peer_device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 70 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 71 | /* Defines to control fault insertion */ |
| 72 | enum { |
| 73 | DRBD_FAULT_MD_WR = 0, /* meta data write */ |
| 74 | DRBD_FAULT_MD_RD = 1, /* read */ |
| 75 | DRBD_FAULT_RS_WR = 2, /* resync */ |
| 76 | DRBD_FAULT_RS_RD = 3, |
| 77 | DRBD_FAULT_DT_WR = 4, /* data */ |
| 78 | DRBD_FAULT_DT_RD = 5, |
| 79 | DRBD_FAULT_DT_RA = 6, /* data read ahead */ |
| 80 | DRBD_FAULT_BM_ALLOC = 7, /* bitmap allocation */ |
| 81 | DRBD_FAULT_AL_EE = 8, /* alloc ee */ |
Philipp Reisner | 6b4388a | 2010-04-26 14:11:45 +0200 | [diff] [blame] | 82 | DRBD_FAULT_RECEIVE = 9, /* Changes some bytes upon receiving a [rs]data block */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 83 | |
| 84 | DRBD_FAULT_MAX, |
| 85 | }; |
| 86 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 87 | extern unsigned int |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 88 | _drbd_insert_fault(struct drbd_device *device, unsigned int type); |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 89 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 90 | static inline int |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 91 | drbd_insert_fault(struct drbd_device *device, unsigned int type) { |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 92 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
Roland Kammerer | 183ece3 | 2017-08-29 10:20:46 +0200 | [diff] [blame] | 93 | return drbd_fault_rate && |
| 94 | (drbd_enable_faults & (1<<type)) && |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 95 | _drbd_insert_fault(device, type); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 96 | #else |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 97 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 98 | #endif |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 99 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 100 | |
| 101 | /* integer division, round _UP_ to the next integer */ |
| 102 | #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0)) |
| 103 | /* usual integer division */ |
| 104 | #define div_floor(A, B) ((A)/(B)) |
| 105 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 106 | extern struct ratelimit_state drbd_ratelimit_state; |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 107 | extern struct idr drbd_devices; /* RCU, updates: genl_lock() */ |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 108 | extern struct list_head drbd_resources; /* RCU, updates: genl_lock() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 109 | |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 110 | extern const char *cmdname(enum drbd_packet cmd); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 111 | |
| 112 | /* for sending/receiving the bitmap, |
| 113 | * possibly in some encoding scheme */ |
| 114 | struct bm_xfer_ctx { |
| 115 | /* "const" |
| 116 | * stores total bits and long words |
| 117 | * of the bitmap, so we don't need to |
| 118 | * call the accessor functions over and again. */ |
| 119 | unsigned long bm_bits; |
| 120 | unsigned long bm_words; |
| 121 | /* during xfer, current position within the bitmap */ |
| 122 | unsigned long bit_offset; |
| 123 | unsigned long word_offset; |
| 124 | |
| 125 | /* statistics; index: (h->command == P_BITMAP) */ |
| 126 | unsigned packets[2]; |
| 127 | unsigned bytes[2]; |
| 128 | }; |
| 129 | |
Andreas Gruenbacher | 5e54c2a | 2023-03-30 12:27:41 +0200 | [diff] [blame] | 130 | extern void INFO_bm_xfer_stats(struct drbd_peer_device *peer_device, |
| 131 | const char *direction, struct bm_xfer_ctx *c); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 132 | |
| 133 | static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) |
| 134 | { |
| 135 | /* word_offset counts "native long words" (32 or 64 bit), |
| 136 | * aligned at 64 bit. |
| 137 | * Encoded packet may end at an unaligned bit offset. |
| 138 | * In case a fallback clear text packet is transmitted in |
| 139 | * between, we adjust this offset back to the last 64bit |
| 140 | * aligned "native long word", which makes coding and decoding |
| 141 | * the plain text bitmap much more convenient. */ |
| 142 | #if BITS_PER_LONG == 64 |
| 143 | c->word_offset = c->bit_offset >> 6; |
| 144 | #elif BITS_PER_LONG == 32 |
| 145 | c->word_offset = c->bit_offset >> 5; |
| 146 | c->word_offset &= ~(1UL); |
| 147 | #else |
| 148 | # error "unsupported BITS_PER_LONG" |
| 149 | #endif |
| 150 | } |
| 151 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 152 | extern unsigned int drbd_header_size(struct drbd_connection *connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 153 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 154 | /**********************************************************************/ |
| 155 | enum drbd_thread_state { |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 156 | NONE, |
| 157 | RUNNING, |
| 158 | EXITING, |
| 159 | RESTARTING |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 160 | }; |
| 161 | |
| 162 | struct drbd_thread { |
| 163 | spinlock_t t_lock; |
| 164 | struct task_struct *task; |
| 165 | struct completion stop; |
| 166 | enum drbd_thread_state t_state; |
| 167 | int (*function) (struct drbd_thread *); |
Andreas Gruenbacher | 2457b6d | 2011-07-21 13:45:21 +0200 | [diff] [blame] | 168 | struct drbd_resource *resource; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 169 | struct drbd_connection *connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 170 | int reset_cpu_mask; |
Andreas Gruenbacher | c60b025 | 2011-08-10 15:05:02 +0200 | [diff] [blame] | 171 | const char *name; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 172 | }; |
| 173 | |
| 174 | static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) |
| 175 | { |
| 176 | /* THINK testing the t_state seems to be uncritical in all cases |
| 177 | * (but thread_{start,stop}), so we can read it *without* the lock. |
| 178 | * --lge */ |
| 179 | |
| 180 | smp_rmb(); |
| 181 | return thi->t_state; |
| 182 | } |
| 183 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 184 | struct drbd_work { |
| 185 | struct list_head list; |
Andreas Gruenbacher | 309a834 | 2010-12-21 12:38:39 +0100 | [diff] [blame] | 186 | int (*cb)(struct drbd_work *, int cancel); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 187 | }; |
| 188 | |
| 189 | struct drbd_device_work { |
| 190 | struct drbd_work w; |
| 191 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 192 | }; |
| 193 | |
Andreas Gruenbacher | ace652a | 2011-01-03 17:09:58 +0100 | [diff] [blame] | 194 | #include "drbd_interval.h" |
| 195 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 196 | extern int drbd_wait_misc(struct drbd_device *, struct drbd_interval *); |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 197 | |
Andreas Gruenbacher | 28bc3b8 | 2014-08-14 18:33:30 +0200 | [diff] [blame] | 198 | extern void lock_all_resources(void); |
| 199 | extern void unlock_all_resources(void); |
| 200 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 201 | struct drbd_request { |
| 202 | struct drbd_work w; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 203 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 204 | |
| 205 | /* if local IO is not allowed, will be NULL. |
| 206 | * if local IO _is_ allowed, holds the locally submitted bio clone, |
| 207 | * or, after local IO completion, the ERR_PTR(error). |
Andreas Gruenbacher | fcefa62 | 2011-02-17 16:46:59 +0100 | [diff] [blame] | 208 | * see drbd_request_endio(). */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 209 | struct bio *private_bio; |
| 210 | |
Andreas Gruenbacher | ace652a | 2011-01-03 17:09:58 +0100 | [diff] [blame] | 211 | struct drbd_interval i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 212 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 213 | /* epoch: used to check on "completion" whether this req was in |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 214 | * the current epoch, and we therefore have to close it, |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 215 | * causing a p_barrier packet to be send, starting a new epoch. |
| 216 | * |
| 217 | * This corresponds to "barrier" in struct p_barrier[_ack], |
| 218 | * and to "barrier_nr" in struct drbd_epoch (and various |
| 219 | * comments/function parameters/local variable names). |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 220 | */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 221 | unsigned int epoch; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 222 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 223 | struct list_head tl_requests; /* ring list in the transfer log */ |
| 224 | struct bio *master_bio; /* master bio pointer */ |
Lars Ellenberg | e5f891b | 2013-11-22 12:32:01 +0100 | [diff] [blame] | 225 | |
Lars Ellenberg | 844a6ae7 | 2013-11-22 12:52:03 +0100 | [diff] [blame] | 226 | /* see struct drbd_device */ |
| 227 | struct list_head req_pending_master_completion; |
| 228 | struct list_head req_pending_local; |
| 229 | |
Lars Ellenberg | e5f891b | 2013-11-22 12:32:01 +0100 | [diff] [blame] | 230 | /* for generic IO accounting */ |
| 231 | unsigned long start_jif; |
| 232 | |
| 233 | /* for DRBD internal statistics */ |
| 234 | |
| 235 | /* Minimal set of time stamps to determine if we wait for activity log |
| 236 | * transactions, local disk or peer. 32 bit "jiffies" are good enough, |
| 237 | * we don't expect a DRBD request to be stalled for several month. |
| 238 | */ |
| 239 | |
| 240 | /* before actual request processing */ |
| 241 | unsigned long in_actlog_jif; |
| 242 | |
| 243 | /* local disk */ |
| 244 | unsigned long pre_submit_jif; |
| 245 | |
| 246 | /* per connection */ |
| 247 | unsigned long pre_send_jif; |
| 248 | unsigned long acked_jif; |
| 249 | unsigned long net_done_jif; |
| 250 | |
| 251 | /* Possibly even more detail to track each phase: |
| 252 | * master_completion_jif |
| 253 | * how long did it take to complete the master bio |
| 254 | * (application visible latency) |
| 255 | * allocated_jif |
| 256 | * how long the master bio was blocked until we finally allocated |
| 257 | * a tracking struct |
| 258 | * in_actlog_jif |
| 259 | * how long did we wait for activity log transactions |
| 260 | * |
| 261 | * net_queued_jif |
| 262 | * when did we finally queue it for sending |
| 263 | * pre_send_jif |
| 264 | * when did we start sending it |
| 265 | * post_send_jif |
| 266 | * how long did we block in the network stack trying to send it |
| 267 | * acked_jif |
| 268 | * when did we receive (or fake, in protocol A) a remote ACK |
| 269 | * net_done_jif |
| 270 | * when did we receive final acknowledgement (P_BARRIER_ACK), |
| 271 | * or decide, e.g. on connection loss, that we do no longer expect |
| 272 | * anything from this peer for this request. |
| 273 | * |
| 274 | * pre_submit_jif |
| 275 | * post_sub_jif |
| 276 | * when did we start submiting to the lower level device, |
| 277 | * and how long did we block in that submit function |
| 278 | * local_completion_jif |
| 279 | * how long did it take the lower level device to complete this request |
| 280 | */ |
| 281 | |
Lars Ellenberg | b406777 | 2012-01-24 16:58:11 +0100 | [diff] [blame] | 282 | |
| 283 | /* once it hits 0, we may complete the master_bio */ |
| 284 | atomic_t completion_ref; |
| 285 | /* once it hits 0, we may destroy this drbd_request object */ |
| 286 | struct kref kref; |
Lars Ellenberg | a0d856d | 2012-01-24 17:19:42 +0100 | [diff] [blame] | 287 | |
| 288 | unsigned rq_state; /* see comments above _req_mod() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 289 | }; |
| 290 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 291 | struct drbd_epoch { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 292 | struct drbd_connection *connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 293 | struct list_head list; |
| 294 | unsigned int barrier_nr; |
| 295 | atomic_t epoch_size; /* increased on every request added. */ |
| 296 | atomic_t active; /* increased on every req. added, and dec on every finished. */ |
| 297 | unsigned long flags; |
| 298 | }; |
| 299 | |
Rashika Kheria | de0b2e6 | 2013-12-19 15:07:47 +0530 | [diff] [blame] | 300 | /* Prototype declaration of function defined in drbd_receiver.c */ |
| 301 | int drbdd_init(struct drbd_thread *); |
| 302 | int drbd_asender(struct drbd_thread *); |
| 303 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 304 | /* drbd_epoch flag bits */ |
| 305 | enum { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 306 | DE_HAVE_BARRIER_NUMBER, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 307 | }; |
| 308 | |
| 309 | enum epoch_event { |
| 310 | EV_PUT, |
| 311 | EV_GOT_BARRIER_NR, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 312 | EV_BECAME_LAST, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 313 | EV_CLEANUP = 32, /* used as flag */ |
| 314 | }; |
| 315 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 316 | struct digest_info { |
| 317 | int digest_size; |
| 318 | void *digest; |
| 319 | }; |
| 320 | |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 321 | struct drbd_peer_request { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 322 | struct drbd_work w; |
| 323 | struct drbd_peer_device *peer_device; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 324 | struct drbd_epoch *epoch; /* for writes */ |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 325 | struct page *pages; |
Christoph Böhmwalder | ce668b6 | 2022-11-09 14:34:53 +0100 | [diff] [blame] | 326 | blk_opf_t opf; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 327 | atomic_t pending_bios; |
Andreas Gruenbacher | 010f6e6 | 2011-01-14 20:59:35 +0100 | [diff] [blame] | 328 | struct drbd_interval i; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 329 | /* see comments on ee flag bits below */ |
| 330 | unsigned long flags; |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 331 | unsigned long submit_jif; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 332 | union { |
| 333 | u64 block_id; |
| 334 | struct digest_info *digest; |
| 335 | }; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 336 | }; |
| 337 | |
Christoph Böhmwalder | ce668b6 | 2022-11-09 14:34:53 +0100 | [diff] [blame] | 338 | /* Equivalent to bio_op and req_op. */ |
| 339 | #define peer_req_op(peer_req) \ |
| 340 | ((peer_req)->opf & REQ_OP_MASK) |
| 341 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 342 | /* ee flag bits. |
| 343 | * While corresponding bios are in flight, the only modification will be |
| 344 | * set_bit WAS_ERROR, which has to be atomic. |
| 345 | * If no bios are in flight yet, or all have been completed, |
| 346 | * non-atomic modification to ee->flags is ok. |
| 347 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 348 | enum { |
| 349 | __EE_CALL_AL_COMPLETE_IO, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 350 | __EE_MAY_SET_IN_SYNC, |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 351 | |
Bart Van Assche | 9305455 | 2018-10-03 13:56:25 -0700 | [diff] [blame] | 352 | /* is this a TRIM aka REQ_OP_DISCARD? */ |
Lars Ellenberg | f31e583 | 2018-12-20 17:23:42 +0100 | [diff] [blame] | 353 | __EE_TRIM, |
| 354 | /* explicit zero-out requested, or |
| 355 | * our lower level cannot handle trim, |
| 356 | * and we want to fall back to zeroout instead */ |
| 357 | __EE_ZEROOUT, |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 358 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 359 | /* In case a barrier failed, |
| 360 | * we need to resubmit without the barrier flag. */ |
| 361 | __EE_RESUBMITTED, |
| 362 | |
Andreas Gruenbacher | 6c852be | 2011-02-04 15:38:52 +0100 | [diff] [blame] | 363 | /* we may have several bios per peer request. |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 364 | * if any of those fail, we set this flag atomically |
| 365 | * from the endio callback */ |
| 366 | __EE_WAS_ERROR, |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 367 | |
| 368 | /* This ee has a pointer to a digest instead of a block id */ |
| 369 | __EE_HAS_DIGEST, |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 370 | |
| 371 | /* Conflicting local requests need to be restarted after this request */ |
| 372 | __EE_RESTART_REQUESTS, |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 373 | |
| 374 | /* The peer wants a write ACK for this (wire proto C) */ |
| 375 | __EE_SEND_WRITE_ACK, |
Philipp Reisner | 302bdea | 2011-04-21 11:36:49 +0200 | [diff] [blame] | 376 | |
| 377 | /* Is set when net_conf had two_primaries set while creating this peer_req */ |
| 378 | __EE_IN_INTERVAL_TREE, |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 379 | |
| 380 | /* for debugfs: */ |
| 381 | /* has this been submitted, or does it still wait for something else? */ |
| 382 | __EE_SUBMITTED, |
| 383 | |
| 384 | /* this is/was a write request */ |
| 385 | __EE_WRITE, |
| 386 | |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 387 | /* this is/was a write same request */ |
| 388 | __EE_WRITE_SAME, |
| 389 | |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 390 | /* this originates from application on peer |
| 391 | * (not some resync or verify or other DRBD internal request) */ |
| 392 | __EE_APPLICATION, |
Philipp Reisner | 700ca8c | 2016-06-14 00:26:13 +0200 | [diff] [blame] | 393 | |
| 394 | /* If it contains only 0 bytes, send back P_RS_DEALLOCATED */ |
| 395 | __EE_RS_THIN_REQ, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 396 | }; |
| 397 | #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 398 | #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC) |
Lars Ellenberg | f31e583 | 2018-12-20 17:23:42 +0100 | [diff] [blame] | 399 | #define EE_TRIM (1<<__EE_TRIM) |
| 400 | #define EE_ZEROOUT (1<<__EE_ZEROOUT) |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 401 | #define EE_RESUBMITTED (1<<__EE_RESUBMITTED) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 402 | #define EE_WAS_ERROR (1<<__EE_WAS_ERROR) |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 403 | #define EE_HAS_DIGEST (1<<__EE_HAS_DIGEST) |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 404 | #define EE_RESTART_REQUESTS (1<<__EE_RESTART_REQUESTS) |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 405 | #define EE_SEND_WRITE_ACK (1<<__EE_SEND_WRITE_ACK) |
Philipp Reisner | 302bdea | 2011-04-21 11:36:49 +0200 | [diff] [blame] | 406 | #define EE_IN_INTERVAL_TREE (1<<__EE_IN_INTERVAL_TREE) |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 407 | #define EE_SUBMITTED (1<<__EE_SUBMITTED) |
| 408 | #define EE_WRITE (1<<__EE_WRITE) |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 409 | #define EE_WRITE_SAME (1<<__EE_WRITE_SAME) |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 410 | #define EE_APPLICATION (1<<__EE_APPLICATION) |
Philipp Reisner | 700ca8c | 2016-06-14 00:26:13 +0200 | [diff] [blame] | 411 | #define EE_RS_THIN_REQ (1<<__EE_RS_THIN_REQ) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 412 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 413 | /* flag bits per device */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 414 | enum { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 415 | UNPLUG_REMOTE, /* sending a "UnplugRemote" could help */ |
| 416 | MD_DIRTY, /* current uuids and flags not yet on disk */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 417 | USE_DEGR_WFC_T, /* degr-wfc-timeout instead of wfc-timeout. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 418 | CL_ST_CHG_SUCCESS, |
| 419 | CL_ST_CHG_FAIL, |
| 420 | CRASHED_PRIMARY, /* This node was a crashed primary. |
| 421 | * Gets cleared when the state.conn |
| 422 | * goes into C_CONNECTED state. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 423 | CONSIDER_RESYNC, |
| 424 | |
Philipp Reisner | a8a4e51 | 2010-08-25 10:21:04 +0200 | [diff] [blame] | 425 | MD_NO_FUA, /* Users wants us to not use FUA/FLUSH on meta data dev */ |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 426 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 427 | BITMAP_IO, /* suspend application io; |
| 428 | once no more io in flight, start bitmap io */ |
| 429 | BITMAP_IO_QUEUED, /* Started bitmap IO */ |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 430 | WAS_IO_ERROR, /* Local disk failed, returned IO error */ |
| 431 | WAS_READ_ERROR, /* Local disk READ failed (set additionally to the above) */ |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 432 | FORCE_DETACH, /* Force-detach from local disk, aborting any pending local IO */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 433 | RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 434 | RESIZE_PENDING, /* Size change detected locally, waiting for the response from |
| 435 | * the peer, if it changed there as well. */ |
Philipp Reisner | 43a5182 | 2010-06-11 11:26:34 +0200 | [diff] [blame] | 436 | NEW_CUR_UUID, /* Create new current UUID when thawing IO */ |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 437 | AL_SUSPENDED, /* Activity logging is currently suspended. */ |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 438 | AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */ |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 439 | B_RS_H_DONE, /* Before resync handler done (already executed) */ |
Philipp Reisner | 08b165b | 2011-09-05 16:22:33 +0200 | [diff] [blame] | 440 | DISCARD_MY_DATA, /* discard_my_data flag per volume */ |
Philipp Reisner | 380207d | 2011-11-11 12:31:20 +0100 | [diff] [blame] | 441 | READ_BALANCE_RR, |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 442 | |
Lars Ellenberg | f418815 | 2014-05-05 23:05:47 +0200 | [diff] [blame] | 443 | FLUSH_PENDING, /* if set, device->flush_jif is when we submitted that flush |
| 444 | * from drbd_flush_after_epoch() */ |
| 445 | |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 446 | /* cleared only after backing device related structures have been destroyed. */ |
| 447 | GOING_DISKLESS, /* Disk is being detached, because of io-error, or admin request. */ |
| 448 | |
| 449 | /* to be used in drbd_device_post_work() */ |
| 450 | GO_DISKLESS, /* tell worker to schedule cleanup before detach */ |
| 451 | DESTROY_DISK, /* tell worker to close backing devices and destroy related structures. */ |
Lars Ellenberg | ac0acb9 | 2014-02-11 09:47:58 +0100 | [diff] [blame] | 452 | MD_SYNC, /* tell worker to call drbd_md_sync() */ |
| 453 | RS_START, /* tell worker to start resync/OV */ |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 454 | RS_PROGRESS, /* tell worker that resync made significant progress */ |
| 455 | RS_DONE, /* tell worker that resync is done */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 456 | }; |
| 457 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 458 | struct drbd_bitmap; /* opaque for drbd_device */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 459 | |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 460 | /* definition of bits in bm_flags to be used in drbd_bm_lock |
| 461 | * and drbd_bitmap_io and friends. */ |
| 462 | enum bm_flag { |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 463 | /* currently locked for bulk operation */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 464 | BM_LOCKED_MASK = 0xf, |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 465 | |
| 466 | /* in detail, that is: */ |
| 467 | BM_DONT_CLEAR = 0x1, |
| 468 | BM_DONT_SET = 0x2, |
| 469 | BM_DONT_TEST = 0x4, |
| 470 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 471 | /* so we can mark it locked for bulk operation, |
| 472 | * and still allow all non-bulk operations */ |
| 473 | BM_IS_LOCKED = 0x8, |
| 474 | |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 475 | /* (test bit, count bit) allowed (common case) */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 476 | BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 477 | |
| 478 | /* testing bits, as well as setting new bits allowed, but clearing bits |
| 479 | * would be unexpected. Used during bitmap receive. Setting new bits |
| 480 | * requires sending of "out-of-sync" information, though. */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 481 | BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 482 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 483 | /* for drbd_bm_write_copy_pages, everything is allowed, |
| 484 | * only concurrent bulk operations are locked out. */ |
| 485 | BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 486 | }; |
| 487 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 488 | struct drbd_work_queue { |
| 489 | struct list_head q; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 490 | spinlock_t q_lock; /* to protect the list. */ |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 491 | wait_queue_head_t q_wait; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 492 | }; |
| 493 | |
| 494 | struct drbd_socket { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 495 | struct mutex mutex; |
| 496 | struct socket *socket; |
| 497 | /* this way we get our |
| 498 | * send/receive buffers off the stack */ |
Andreas Gruenbacher | 5a87d92 | 2011-03-24 21:17:52 +0100 | [diff] [blame] | 499 | void *sbuf; |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 500 | void *rbuf; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 501 | }; |
| 502 | |
| 503 | struct drbd_md { |
| 504 | u64 md_offset; /* sector offset to 'super' block */ |
| 505 | |
| 506 | u64 la_size_sect; /* last agreed size, unit sectors */ |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 507 | spinlock_t uuid_lock; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 508 | u64 uuid[UI_SIZE]; |
| 509 | u64 device_uuid; |
| 510 | u32 flags; |
| 511 | u32 md_size_sect; |
| 512 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 513 | s32 al_offset; /* signed relative sector offset to activity log */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 514 | s32 bm_offset; /* signed relative sector offset to bitmap */ |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 515 | |
| 516 | /* cached value of bdev->disk_conf->meta_dev_idx (see below) */ |
| 517 | s32 meta_dev_idx; |
| 518 | |
| 519 | /* see al_tr_number_to_on_disk_sector() */ |
| 520 | u32 al_stripes; |
| 521 | u32 al_stripe_size_4k; |
| 522 | u32 al_size_4k; /* cached product of the above */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 523 | }; |
| 524 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 525 | struct drbd_backing_dev { |
| 526 | struct block_device *backing_bdev; |
| 527 | struct block_device *md_bdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 528 | struct drbd_md md; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 529 | struct disk_conf *disk_conf; /* RCU, for updates: resource->conf_update */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 530 | sector_t known_size; /* last known size of that backing device */ |
| 531 | }; |
| 532 | |
| 533 | struct drbd_md_io { |
Lars Ellenberg | e37d243 | 2014-04-01 23:53:30 +0200 | [diff] [blame] | 534 | struct page *page; |
| 535 | unsigned long start_jif; /* last call to drbd_md_get_buffer */ |
| 536 | unsigned long submit_jif; /* last _drbd_md_sync_page_io() submit */ |
| 537 | const char *current_use; |
| 538 | atomic_t in_use; |
Philipp Reisner | 0c46442 | 2011-06-26 22:26:31 +0200 | [diff] [blame] | 539 | unsigned int done; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 540 | int error; |
| 541 | }; |
| 542 | |
| 543 | struct bm_io_work { |
| 544 | struct drbd_work w; |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 545 | struct drbd_peer_device *peer_device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 546 | char *why; |
Lars Ellenberg | 20ceb2b2 | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 547 | enum bm_flag flags; |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 548 | int (*io_fn)(struct drbd_device *device, struct drbd_peer_device *peer_device); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 549 | void (*done)(struct drbd_device *device, int rv); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 550 | }; |
| 551 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 552 | struct fifo_buffer { |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 553 | unsigned int head_index; |
| 554 | unsigned int size; |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 555 | int total; /* sum of all values */ |
Gustavo A. R. Silva | 1060bfc | 2020-05-28 09:35:11 -0500 | [diff] [blame] | 556 | int values[]; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 557 | }; |
Stephen Kitt | 6a36587 | 2020-01-24 21:03:07 +0100 | [diff] [blame] | 558 | extern struct fifo_buffer *fifo_alloc(unsigned int fifo_size); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 559 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 560 | /* flag bits per connection */ |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 561 | enum { |
| 562 | NET_CONGESTED, /* The data socket is congested */ |
Lars Ellenberg | 427c043 | 2012-08-01 12:43:01 +0200 | [diff] [blame] | 563 | RESOLVE_CONFLICTS, /* Set on one node, cleared on the peer! */ |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 564 | SEND_PING, |
Philipp Reisner | 2a67d8b | 2011-02-09 14:10:32 +0100 | [diff] [blame] | 565 | GOT_PING_ACK, /* set when we receive a ping_ack packet, ping_wait gets woken */ |
Philipp Reisner | 4d0fc3f | 2012-01-20 13:52:27 +0100 | [diff] [blame] | 566 | CONN_WD_ST_CHG_REQ, /* A cluster wide state change on the connection is active */ |
Philipp Reisner | fc3b10a | 2011-02-15 11:07:59 +0100 | [diff] [blame] | 567 | CONN_WD_ST_CHG_OKAY, |
| 568 | CONN_WD_ST_CHG_FAIL, |
Philipp Reisner | 8169e41 | 2011-03-15 18:40:27 +0100 | [diff] [blame] | 569 | CONN_DRY_RUN, /* Expect disconnect after resync handshake. */ |
Philipp Reisner | 6936fcb | 2011-11-10 18:45:36 +0100 | [diff] [blame] | 570 | CREATE_BARRIER, /* next P_DATA is preceded by a P_BARRIER */ |
Philipp Reisner | a1096a6 | 2012-04-06 12:07:34 +0200 | [diff] [blame] | 571 | STATE_SENT, /* Do not change state/UUIDs while this is set */ |
Lars Ellenberg | 6f3465e | 2012-07-30 09:08:25 +0200 | [diff] [blame] | 572 | CALLBACK_PENDING, /* Whether we have a call_usermodehelper(, UMH_WAIT_PROC) |
| 573 | * pending, from drbd worker context. |
Lars Ellenberg | 6f3465e | 2012-07-30 09:08:25 +0200 | [diff] [blame] | 574 | */ |
Philipp Reisner | b66623e | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 575 | DISCONNECT_SENT, |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 576 | |
| 577 | DEVICE_WORK_PENDING, /* tell worker that some device has pending work */ |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 578 | }; |
| 579 | |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 580 | enum which_state { NOW, OLD = NOW, NEW }; |
| 581 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 582 | struct drbd_resource { |
| 583 | char *name; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 584 | #ifdef CONFIG_DEBUG_FS |
| 585 | struct dentry *debugfs_res; |
| 586 | struct dentry *debugfs_res_volumes; |
| 587 | struct dentry *debugfs_res_connections; |
| 588 | struct dentry *debugfs_res_in_flight_summary; |
| 589 | #endif |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 590 | struct kref kref; |
Andreas Gruenbacher | 803ea13 | 2011-06-09 01:40:48 +0200 | [diff] [blame] | 591 | struct idr devices; /* volume number to device mapping */ |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 592 | struct list_head connections; |
| 593 | struct list_head resources; |
Andreas Gruenbacher | eb6bea6 | 2011-06-21 16:11:28 +0200 | [diff] [blame] | 594 | struct res_opts res_opts; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 595 | struct mutex conf_update; /* mutex for ready-copy-update of net_conf and disk_conf */ |
Lars Ellenberg | 9e27687 | 2014-04-28 18:43:22 +0200 | [diff] [blame] | 596 | struct mutex adm_mutex; /* mutex to serialize administrative requests */ |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 597 | spinlock_t req_lock; |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 598 | |
| 599 | unsigned susp:1; /* IO suspended by user */ |
| 600 | unsigned susp_nod:1; /* IO suspended because no data */ |
| 601 | unsigned susp_fen:1; /* IO suspended because fence peer handler runs */ |
Andreas Gruenbacher | 625a6ba | 2011-07-22 14:29:02 +0200 | [diff] [blame] | 602 | |
Philipp Reisner | e952658 | 2013-11-22 15:53:41 +0100 | [diff] [blame] | 603 | enum write_ordering_e write_ordering; |
| 604 | |
Andreas Gruenbacher | 625a6ba | 2011-07-22 14:29:02 +0200 | [diff] [blame] | 605 | cpumask_var_t cpu_mask; |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 606 | }; |
| 607 | |
Lars Ellenberg | 944410e | 2014-05-06 15:02:05 +0200 | [diff] [blame] | 608 | struct drbd_thread_timing_details |
| 609 | { |
| 610 | unsigned long start_jif; |
| 611 | void *cb_addr; |
| 612 | const char *caller_fn; |
| 613 | unsigned int line; |
| 614 | unsigned int cb_nr; |
| 615 | }; |
| 616 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 617 | struct drbd_connection { |
| 618 | struct list_head connections; |
| 619 | struct drbd_resource *resource; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 620 | #ifdef CONFIG_DEBUG_FS |
| 621 | struct dentry *debugfs_conn; |
| 622 | struct dentry *debugfs_conn_callback_history; |
| 623 | struct dentry *debugfs_conn_oldest_requests; |
| 624 | #endif |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 625 | struct kref kref; |
Andreas Gruenbacher | c06ece6 | 2011-06-21 17:23:59 +0200 | [diff] [blame] | 626 | struct idr peer_devices; /* volume number to peer device mapping */ |
Philipp Reisner | 8410da8f0 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 627 | enum drbd_conns cstate; /* Only C_STANDALONE to C_WF_REPORT_PARAMS */ |
| 628 | struct mutex cstate_mutex; /* Protects graceful disconnects */ |
Philipp Reisner | 28e448b | 2013-06-25 16:50:06 +0200 | [diff] [blame] | 629 | unsigned int connect_cnt; /* Inc each time a connection is established */ |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 630 | |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 631 | unsigned long flags; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 632 | struct net_conf *net_conf; /* content protected by rcu */ |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 633 | wait_queue_head_t ping_wait; /* Woken upon reception of a ping, and a state change */ |
Philipp Reisner | e42325a | 2011-01-19 13:55:45 +0100 | [diff] [blame] | 634 | |
Andreas Gruenbacher | 089c075 | 2011-06-14 18:28:09 +0200 | [diff] [blame] | 635 | struct sockaddr_storage my_addr; |
| 636 | int my_addr_len; |
| 637 | struct sockaddr_storage peer_addr; |
| 638 | int peer_addr_len; |
| 639 | |
Philipp Reisner | e42325a | 2011-01-19 13:55:45 +0100 | [diff] [blame] | 640 | struct drbd_socket data; /* data/barrier/cstate/parameter packets */ |
| 641 | struct drbd_socket meta; /* ping/ack (metadata) packets */ |
Philipp Reisner | 31890f4 | 2011-01-19 14:12:51 +0100 | [diff] [blame] | 642 | int agreed_pro_version; /* actually used protocol version */ |
Lars Ellenberg | 20c68fd | 2014-04-28 18:43:25 +0200 | [diff] [blame] | 643 | u32 agreed_features; |
Philipp Reisner | 31890f4 | 2011-01-19 14:12:51 +0100 | [diff] [blame] | 644 | unsigned long last_received; /* in jiffies, either socket */ |
| 645 | unsigned int ko_count; |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 646 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 647 | struct list_head transfer_log; /* all requests not yet fully processed */ |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 648 | |
Herbert Xu | 9534d67 | 2016-01-24 21:19:21 +0800 | [diff] [blame] | 649 | struct crypto_shash *cram_hmac_tfm; |
Kees Cook | 3d0e637 | 2018-08-06 16:32:16 -0700 | [diff] [blame] | 650 | struct crypto_shash *integrity_tfm; /* checksums we compute, updates protected by connection->data->mutex */ |
| 651 | struct crypto_shash *peer_integrity_tfm; /* checksums we verify, only accessed from receiver thread */ |
| 652 | struct crypto_shash *csums_tfm; |
| 653 | struct crypto_shash *verify_tfm; |
Philipp Reisner | a063845 | 2011-01-19 14:31:32 +0100 | [diff] [blame] | 654 | void *int_dig_in; |
| 655 | void *int_dig_vv; |
| 656 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 657 | /* receiver side */ |
Philipp Reisner | 12038a3 | 2011-11-09 19:18:00 +0100 | [diff] [blame] | 658 | struct drbd_epoch *current_epoch; |
| 659 | spinlock_t epoch_lock; |
| 660 | unsigned int epochs; |
Lars Ellenberg | b379c41 | 2011-11-17 11:49:46 +0100 | [diff] [blame] | 661 | atomic_t current_tle_nr; /* transfer log epoch number */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 662 | unsigned current_tle_writes; /* writes seen within this tl epoch */ |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 663 | |
Lars Ellenberg | 07be15b | 2012-05-07 11:53:08 +0200 | [diff] [blame] | 664 | unsigned long last_reconnect_jif; |
Lars Ellenberg | c51a0ef | 2017-08-29 10:20:32 +0200 | [diff] [blame] | 665 | /* empty member on older kernels without blk_start_plug() */ |
| 666 | struct blk_plug receiver_plug; |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 667 | struct drbd_thread receiver; |
| 668 | struct drbd_thread worker; |
Philipp Reisner | 1c03e52 | 2015-03-16 15:01:00 +0100 | [diff] [blame] | 669 | struct drbd_thread ack_receiver; |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 670 | struct workqueue_struct *ack_sender; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 671 | |
Lars Ellenberg | 7753a4c1 | 2013-11-22 13:00:12 +0100 | [diff] [blame] | 672 | /* cached pointers, |
| 673 | * so we can look up the oldest pending requests more quickly. |
| 674 | * protected by resource->req_lock */ |
| 675 | struct drbd_request *req_next; /* DRBD 9: todo.req_next */ |
| 676 | struct drbd_request *req_ack_pending; |
| 677 | struct drbd_request *req_not_net_done; |
| 678 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 679 | /* sender side */ |
Lars Ellenberg | d5b27b0 | 2011-11-14 15:42:37 +0100 | [diff] [blame] | 680 | struct drbd_work_queue sender_work; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 681 | |
Lars Ellenberg | 944410e | 2014-05-06 15:02:05 +0200 | [diff] [blame] | 682 | #define DRBD_THREAD_DETAILS_HIST 16 |
| 683 | unsigned int w_cb_nr; /* keeps counting up */ |
| 684 | unsigned int r_cb_nr; /* keeps counting up */ |
| 685 | struct drbd_thread_timing_details w_timing_details[DRBD_THREAD_DETAILS_HIST]; |
| 686 | struct drbd_thread_timing_details r_timing_details[DRBD_THREAD_DETAILS_HIST]; |
| 687 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 688 | struct { |
Lars Ellenberg | 84d34f2 | 2015-02-19 13:54:11 +0100 | [diff] [blame] | 689 | unsigned long last_sent_barrier_jif; |
| 690 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 691 | /* whether this sender thread |
| 692 | * has processed a single write yet. */ |
| 693 | bool seen_any_write_yet; |
| 694 | |
| 695 | /* Which barrier number to send with the next P_BARRIER */ |
| 696 | int current_epoch_nr; |
| 697 | |
| 698 | /* how many write requests have been sent |
| 699 | * with req->epoch == current_epoch_nr. |
| 700 | * If none, no P_BARRIER will be sent. */ |
| 701 | unsigned current_epoch_writes; |
| 702 | } send; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 703 | }; |
| 704 | |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 705 | static inline bool has_net_conf(struct drbd_connection *connection) |
| 706 | { |
| 707 | bool has_net_conf; |
| 708 | |
| 709 | rcu_read_lock(); |
| 710 | has_net_conf = rcu_dereference(connection->net_conf); |
| 711 | rcu_read_unlock(); |
| 712 | |
| 713 | return has_net_conf; |
| 714 | } |
| 715 | |
Lars Ellenberg | 944410e | 2014-05-06 15:02:05 +0200 | [diff] [blame] | 716 | void __update_timing_details( |
| 717 | struct drbd_thread_timing_details *tdp, |
| 718 | unsigned int *cb_nr, |
| 719 | void *cb, |
| 720 | const char *fn, const unsigned int line); |
| 721 | |
| 722 | #define update_worker_timing_details(c, cb) \ |
| 723 | __update_timing_details(c->w_timing_details, &c->w_cb_nr, cb, __func__ , __LINE__ ) |
| 724 | #define update_receiver_timing_details(c, cb) \ |
| 725 | __update_timing_details(c->r_timing_details, &c->r_cb_nr, cb, __func__ , __LINE__ ) |
| 726 | |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 727 | struct submit_worker { |
| 728 | struct workqueue_struct *wq; |
| 729 | struct work_struct worker; |
| 730 | |
Lars Ellenberg | 844a6ae7 | 2013-11-22 12:52:03 +0100 | [diff] [blame] | 731 | /* protected by ..->resource->req_lock */ |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 732 | struct list_head writes; |
| 733 | }; |
| 734 | |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 735 | struct drbd_peer_device { |
| 736 | struct list_head peer_devices; |
| 737 | struct drbd_device *device; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 738 | struct drbd_connection *connection; |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 739 | struct work_struct send_acks_work; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 740 | #ifdef CONFIG_DEBUG_FS |
| 741 | struct dentry *debugfs_peer_dev; |
| 742 | #endif |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 743 | }; |
| 744 | |
| 745 | struct drbd_device { |
Andreas Gruenbacher | d8628a8 | 2011-06-09 01:38:00 +0200 | [diff] [blame] | 746 | struct drbd_resource *resource; |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 747 | struct list_head peer_devices; |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 748 | struct list_head pending_bitmap_io; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 749 | |
| 750 | unsigned long flush_jif; |
| 751 | #ifdef CONFIG_DEBUG_FS |
| 752 | struct dentry *debugfs_minor; |
| 753 | struct dentry *debugfs_vol; |
| 754 | struct dentry *debugfs_vol_oldest_requests; |
| 755 | struct dentry *debugfs_vol_act_log_extents; |
| 756 | struct dentry *debugfs_vol_resync_extents; |
| 757 | struct dentry *debugfs_vol_data_gen_id; |
Lars Ellenberg | f5ec017 | 2015-03-18 17:19:10 +0100 | [diff] [blame] | 758 | struct dentry *debugfs_vol_ed_gen_id; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 759 | #endif |
| 760 | |
| 761 | unsigned int vnr; /* volume number within the connection */ |
| 762 | unsigned int minor; /* device minor number */ |
| 763 | |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 764 | struct kref kref; |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 765 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 766 | /* things that are stored as / read from meta data on disk */ |
| 767 | unsigned long flags; |
| 768 | |
| 769 | /* configured by drbdsetup */ |
Christoph Böhmwalder | 9cf766a | 2023-01-13 13:35:35 +0100 | [diff] [blame] | 770 | struct drbd_backing_dev *ldev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 771 | |
| 772 | sector_t p_size; /* partner's disk size */ |
| 773 | struct request_queue *rq_queue; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 774 | struct gendisk *vdisk; |
| 775 | |
Lars Ellenberg | 07be15b | 2012-05-07 11:53:08 +0200 | [diff] [blame] | 776 | unsigned long last_reattach_jif; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 777 | struct drbd_work resync_work; |
| 778 | struct drbd_work unplug_work; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 779 | struct timer_list resync_timer; |
| 780 | struct timer_list md_sync_timer; |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 781 | struct timer_list start_resync_timer; |
Philipp Reisner | 7fde2be | 2011-03-01 11:08:28 +0100 | [diff] [blame] | 782 | struct timer_list request_timer; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 783 | |
| 784 | /* Used after attach while negotiating new disk state. */ |
| 785 | union drbd_state new_state_tmp; |
| 786 | |
Philipp Reisner | da9fbc2 | 2011-03-29 10:52:01 +0200 | [diff] [blame] | 787 | union drbd_dev_state state; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 788 | wait_queue_head_t misc_wait; |
| 789 | wait_queue_head_t state_wait; /* upon each state change. */ |
| 790 | unsigned int send_cnt; |
| 791 | unsigned int recv_cnt; |
| 792 | unsigned int read_cnt; |
| 793 | unsigned int writ_cnt; |
| 794 | unsigned int al_writ_cnt; |
| 795 | unsigned int bm_writ_cnt; |
| 796 | atomic_t ap_bio_cnt; /* Requests we need to complete */ |
Lars Ellenberg | ad3fee7 | 2013-12-20 11:22:13 +0100 | [diff] [blame] | 797 | atomic_t ap_actlog_cnt; /* Requests waiting for activity log */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 798 | atomic_t ap_pending_cnt; /* AP data packets on the wire, ack expected */ |
| 799 | atomic_t rs_pending_cnt; /* RS request/data packets on the wire */ |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 800 | atomic_t unacked_cnt; /* Need to send replies for */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 801 | atomic_t local_cnt; /* Waiting for local completion */ |
Philipp Reisner | 7dbb438 | 2013-02-28 10:30:19 +0100 | [diff] [blame] | 802 | atomic_t suspend_cnt; |
Philipp Reisner | b2fb6dbe | 2011-01-19 13:48:44 +0100 | [diff] [blame] | 803 | |
Andreas Gruenbacher | dac1389 | 2011-01-21 17:18:39 +0100 | [diff] [blame] | 804 | /* Interval tree of pending local requests */ |
| 805 | struct rb_root read_requests; |
Andreas Gruenbacher | de69671 | 2011-01-20 15:00:24 +0100 | [diff] [blame] | 806 | struct rb_root write_requests; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 807 | |
Lars Ellenberg | 844a6ae7 | 2013-11-22 12:52:03 +0100 | [diff] [blame] | 808 | /* for statistics and timeouts */ |
| 809 | /* [0] read, [1] write */ |
| 810 | struct list_head pending_master_completion[2]; |
| 811 | struct list_head pending_completion[2]; |
| 812 | |
Lars Ellenberg | aaaba34 | 2014-03-18 12:30:09 +0100 | [diff] [blame] | 813 | /* use checksums for *this* resync */ |
| 814 | bool use_csums; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 815 | /* blocks to resync in this run [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 816 | unsigned long rs_total; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 817 | /* number of resync blocks that failed in this run */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 818 | unsigned long rs_failed; |
| 819 | /* Syncer's start time [unit jiffies] */ |
| 820 | unsigned long rs_start; |
| 821 | /* cumulated time in PausedSyncX state [unit jiffies] */ |
| 822 | unsigned long rs_paused; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 823 | /* skipped because csum was equal [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 824 | unsigned long rs_same_csum; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 825 | #define DRBD_SYNC_MARKS 8 |
| 826 | #define DRBD_SYNC_MARK_STEP (3*HZ) |
| 827 | /* block not up-to-date at mark [unit BM_BLOCK_SIZE] */ |
| 828 | unsigned long rs_mark_left[DRBD_SYNC_MARKS]; |
| 829 | /* marks's time [unit jiffies] */ |
| 830 | unsigned long rs_mark_time[DRBD_SYNC_MARKS]; |
| 831 | /* current index into rs_mark_{left,time} */ |
| 832 | int rs_last_mark; |
Philipp Reisner | 328e0f1 | 2012-10-19 14:37:47 +0200 | [diff] [blame] | 833 | unsigned long rs_last_bcast; /* [unit jiffies] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 834 | |
| 835 | /* where does the admin want us to start? (sector) */ |
| 836 | sector_t ov_start_sector; |
Lars Ellenberg | 02b91b5 | 2012-06-28 18:26:52 +0200 | [diff] [blame] | 837 | sector_t ov_stop_sector; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 838 | /* where are we now? (sector) */ |
| 839 | sector_t ov_position; |
| 840 | /* Start sector of out of sync range (to merge printk reporting). */ |
| 841 | sector_t ov_last_oos_start; |
| 842 | /* size of out-of-sync range in sectors. */ |
| 843 | sector_t ov_last_oos_size; |
| 844 | unsigned long ov_left; /* in bits */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 845 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 846 | struct drbd_bitmap *bitmap; |
| 847 | unsigned long bm_resync_fo; /* bit offset for drbd_bm_find_next */ |
| 848 | |
| 849 | /* Used to track operations of resync... */ |
| 850 | struct lru_cache *resync; |
| 851 | /* Number of locked elements in resync LRU */ |
| 852 | unsigned int resync_locked; |
| 853 | /* resync extent number waiting for application requests */ |
| 854 | unsigned int resync_wenr; |
| 855 | |
| 856 | int open_cnt; |
| 857 | u64 *p_uuid; |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 858 | |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 859 | struct list_head active_ee; /* IO in progress (P_DATA gets written to disk) */ |
| 860 | struct list_head sync_ee; /* IO in progress (P_RS_DATA_REPLY gets written to disk) */ |
Andreas Gruenbacher | 18b75d7 | 2011-02-04 15:36:22 +0100 | [diff] [blame] | 861 | struct list_head done_ee; /* need to send P_WRITE_ACK */ |
| 862 | struct list_head read_ee; /* [RS]P_DATA_REQUEST being read */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 863 | struct list_head net_ee; /* zero-copy network send in progress */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 864 | |
| 865 | int next_barrier_nr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 866 | struct list_head resync_reads; |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 867 | atomic_t pp_in_use; /* allocated from page pool */ |
| 868 | atomic_t pp_in_use_by_net; /* sendpage()d, still referenced by tcp */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 869 | wait_queue_head_t ee_wait; |
Philipp Reisner | cc94c65 | 2011-06-26 11:20:27 +0200 | [diff] [blame] | 870 | struct drbd_md_io md_io; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 871 | spinlock_t al_lock; |
| 872 | wait_queue_head_t al_wait; |
| 873 | struct lru_cache *act_log; /* activity log */ |
| 874 | unsigned int al_tr_number; |
| 875 | int al_tr_cycle; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 876 | wait_queue_head_t seq_wait; |
| 877 | atomic_t packet_seq; |
| 878 | unsigned int peer_seq; |
| 879 | spinlock_t peer_seq_lock; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 880 | unsigned long comm_bm_set; /* communicated number of set bits. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 881 | struct bm_io_work bm_io_work; |
| 882 | u64 ed_uuid; /* UUID of the exposed data */ |
Philipp Reisner | 8410da8f0 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 883 | struct mutex own_state_mutex; |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 884 | struct mutex *state_mutex; /* either own_state_mutex or first_peer_device(device)->connection->cstate_mutex */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 885 | char congestion_reason; /* Why we where congested... */ |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 886 | atomic_t rs_sect_in; /* for incoming resync data rate, SyncTarget */ |
| 887 | atomic_t rs_sect_ev; /* for submitted resync data rate, both */ |
| 888 | int rs_last_sect_ev; /* counter to compare with */ |
| 889 | int rs_last_events; /* counter of read or write "events" (unit sectors) |
| 890 | * on the lower level device when we last looked. */ |
| 891 | int c_sync_rate; /* current resync rate after syncer throttle magic */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 892 | struct fifo_buffer *rs_plan_s; /* correction values of resync planer (RCU, connection->conn_update) */ |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 893 | int rs_in_flight; /* resync sectors in flight (to proxy, in proxy and from proxy) */ |
Philipp Reisner | 759fbdf | 2010-10-26 16:02:27 +0200 | [diff] [blame] | 894 | atomic_t ap_in_flight; /* App sectors in flight (waiting for ack) */ |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 895 | unsigned int peer_max_bio_size; |
| 896 | unsigned int local_max_bio_size; |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 897 | |
| 898 | /* any requests that would block in drbd_make_request() |
| 899 | * are deferred to this single-threaded work queue */ |
| 900 | struct submit_worker submit; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 901 | }; |
| 902 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 903 | struct drbd_bm_aio_ctx { |
| 904 | struct drbd_device *device; |
| 905 | struct list_head list; /* on device->pending_bitmap_io */; |
| 906 | unsigned long start_jif; |
| 907 | atomic_t in_flight; |
| 908 | unsigned int done; |
| 909 | unsigned flags; |
| 910 | #define BM_AIO_COPY_PAGES 1 |
| 911 | #define BM_AIO_WRITE_HINTED 2 |
| 912 | #define BM_AIO_WRITE_ALL_PAGES 4 |
| 913 | #define BM_AIO_READ 8 |
| 914 | int error; |
| 915 | struct kref kref; |
| 916 | }; |
| 917 | |
Lars Ellenberg | a910b12 | 2014-04-28 18:43:21 +0200 | [diff] [blame] | 918 | struct drbd_config_context { |
| 919 | /* assigned from drbd_genlmsghdr */ |
| 920 | unsigned int minor; |
| 921 | /* assigned from request attributes, if present */ |
| 922 | unsigned int volume; |
| 923 | #define VOLUME_UNSPECIFIED (-1U) |
| 924 | /* pointer into the request skb, |
| 925 | * limited lifetime! */ |
| 926 | char *resource_name; |
| 927 | struct nlattr *my_addr; |
| 928 | struct nlattr *peer_addr; |
| 929 | |
| 930 | /* reply buffer */ |
| 931 | struct sk_buff *reply_skb; |
| 932 | /* pointer into reply buffer */ |
| 933 | struct drbd_genlmsghdr *reply_dh; |
| 934 | /* resolved from attributes, if possible */ |
| 935 | struct drbd_device *device; |
| 936 | struct drbd_resource *resource; |
| 937 | struct drbd_connection *connection; |
| 938 | }; |
| 939 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 940 | static inline struct drbd_device *minor_to_device(unsigned int minor) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 941 | { |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 942 | return (struct drbd_device *)idr_find(&drbd_devices, minor); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 943 | } |
| 944 | |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 945 | static inline struct drbd_peer_device *first_peer_device(struct drbd_device *device) |
| 946 | { |
Lars Ellenberg | ec4a3407 | 2014-04-28 18:43:35 +0200 | [diff] [blame] | 947 | return list_first_entry_or_null(&device->peer_devices, struct drbd_peer_device, peer_devices); |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 948 | } |
| 949 | |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 950 | static inline struct drbd_peer_device * |
| 951 | conn_peer_device(struct drbd_connection *connection, int volume_number) |
| 952 | { |
| 953 | return idr_find(&connection->peer_devices, volume_number); |
| 954 | } |
| 955 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 956 | #define for_each_resource(resource, _resources) \ |
| 957 | list_for_each_entry(resource, _resources, resources) |
| 958 | |
| 959 | #define for_each_resource_rcu(resource, _resources) \ |
| 960 | list_for_each_entry_rcu(resource, _resources, resources) |
| 961 | |
| 962 | #define for_each_resource_safe(resource, tmp, _resources) \ |
| 963 | list_for_each_entry_safe(resource, tmp, _resources, resources) |
| 964 | |
| 965 | #define for_each_connection(connection, resource) \ |
| 966 | list_for_each_entry(connection, &resource->connections, connections) |
| 967 | |
| 968 | #define for_each_connection_rcu(connection, resource) \ |
| 969 | list_for_each_entry_rcu(connection, &resource->connections, connections) |
| 970 | |
| 971 | #define for_each_connection_safe(connection, tmp, resource) \ |
| 972 | list_for_each_entry_safe(connection, tmp, &resource->connections, connections) |
| 973 | |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 974 | #define for_each_peer_device(peer_device, device) \ |
| 975 | list_for_each_entry(peer_device, &device->peer_devices, peer_devices) |
| 976 | |
| 977 | #define for_each_peer_device_rcu(peer_device, device) \ |
| 978 | list_for_each_entry_rcu(peer_device, &device->peer_devices, peer_devices) |
| 979 | |
| 980 | #define for_each_peer_device_safe(peer_device, tmp, device) \ |
| 981 | list_for_each_entry_safe(peer_device, tmp, &device->peer_devices, peer_devices) |
| 982 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 983 | static inline unsigned int device_to_minor(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 984 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 985 | return device->minor; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 986 | } |
| 987 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 988 | /* |
| 989 | * function declarations |
| 990 | *************************/ |
| 991 | |
| 992 | /* drbd_main.c */ |
| 993 | |
Philipp Reisner | e89b591 | 2010-03-24 17:11:33 +0100 | [diff] [blame] | 994 | enum dds_flags { |
| 995 | DDSF_FORCED = 1, |
| 996 | DDSF_NO_RESYNC = 2, /* Do not run a resync for the new space */ |
| 997 | }; |
| 998 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 999 | extern void drbd_init_set_defaults(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1000 | extern int drbd_thread_start(struct drbd_thread *thi); |
| 1001 | extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait); |
| 1002 | #ifdef CONFIG_SMP |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 1003 | extern void drbd_thread_current_set_cpu(struct drbd_thread *thi); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1004 | #else |
| 1005 | #define drbd_thread_current_set_cpu(A) ({}) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1006 | #endif |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1007 | extern void tl_release(struct drbd_connection *, unsigned int barrier_nr, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1008 | unsigned int set_size); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1009 | extern void tl_clear(struct drbd_connection *); |
| 1010 | extern void drbd_free_sock(struct drbd_connection *connection); |
| 1011 | extern int drbd_send(struct drbd_connection *connection, struct socket *sock, |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1012 | void *buf, size_t size, unsigned msg_flags); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1013 | extern int drbd_send_all(struct drbd_connection *, struct socket *, void *, size_t, |
Andreas Gruenbacher | fb708e4 | 2010-12-15 17:04:36 +0100 | [diff] [blame] | 1014 | unsigned); |
| 1015 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1016 | extern int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd); |
| 1017 | extern int drbd_send_protocol(struct drbd_connection *connection); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1018 | extern int drbd_send_uuids(struct drbd_peer_device *); |
| 1019 | extern int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *); |
| 1020 | extern void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *); |
| 1021 | extern int drbd_send_sizes(struct drbd_peer_device *, int trigger_reply, enum dds_flags flags); |
| 1022 | extern int drbd_send_state(struct drbd_peer_device *, union drbd_state s); |
| 1023 | extern int drbd_send_current_state(struct drbd_peer_device *); |
| 1024 | extern int drbd_send_sync_param(struct drbd_peer_device *); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1025 | extern void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, |
Andreas Gruenbacher | d4e67d7 | 2011-03-16 01:25:28 +0100 | [diff] [blame] | 1026 | u32 set_size); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1027 | extern int drbd_send_ack(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 1028 | struct drbd_peer_request *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1029 | extern void drbd_send_ack_rp(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | a9a9994 | 2011-03-16 01:30:14 +0100 | [diff] [blame] | 1030 | struct p_block_req *rp); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1031 | extern void drbd_send_ack_dp(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | a9a9994 | 2011-03-16 01:30:14 +0100 | [diff] [blame] | 1032 | struct p_data *dp, int data_size); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1033 | extern int drbd_send_ack_ex(struct drbd_peer_device *, enum drbd_packet, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1034 | sector_t sector, int blksize, u64 block_id); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1035 | extern int drbd_send_out_of_sync(struct drbd_peer_device *, struct drbd_request *); |
| 1036 | extern int drbd_send_block(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 1037 | struct drbd_peer_request *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1038 | extern int drbd_send_dblock(struct drbd_peer_device *, struct drbd_request *req); |
| 1039 | extern int drbd_send_drequest(struct drbd_peer_device *, int cmd, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1040 | sector_t sector, int size, u64 block_id); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1041 | extern int drbd_send_drequest_csum(struct drbd_peer_device *, sector_t sector, |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 1042 | int size, void *digest, int digest_size, |
| 1043 | enum drbd_packet cmd); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1044 | extern int drbd_send_ov_request(struct drbd_peer_device *, sector_t sector, int size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1045 | |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1046 | extern int drbd_send_bitmap(struct drbd_device *device, struct drbd_peer_device *peer_device); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1047 | extern void drbd_send_sr_reply(struct drbd_peer_device *, enum drbd_state_rv retcode); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1048 | extern void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode); |
Philipp Reisner | 700ca8c | 2016-06-14 00:26:13 +0200 | [diff] [blame] | 1049 | extern int drbd_send_rs_deallocated(struct drbd_peer_device *, struct drbd_peer_request *); |
Lars Ellenberg | 63a7c8a | 2015-03-26 20:53:55 +0100 | [diff] [blame] | 1050 | extern void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1051 | extern void drbd_device_cleanup(struct drbd_device *device); |
Lars Ellenberg | c51a0ef | 2017-08-29 10:20:32 +0200 | [diff] [blame] | 1052 | extern void drbd_print_uuids(struct drbd_device *device, const char *text); |
| 1053 | extern void drbd_queue_unplug(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1054 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1055 | extern void conn_md_sync(struct drbd_connection *connection); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1056 | extern void drbd_md_write(struct drbd_device *device, void *buffer); |
| 1057 | extern void drbd_md_sync(struct drbd_device *device); |
| 1058 | extern int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev); |
| 1059 | extern void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 1060 | extern void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 1061 | extern void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local); |
| 1062 | extern void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local); |
| 1063 | extern void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local); |
| 1064 | extern void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 1065 | extern void drbd_md_set_flag(struct drbd_device *device, int flags) __must_hold(local); |
| 1066 | extern void drbd_md_clear_flag(struct drbd_device *device, int flags)__must_hold(local); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1067 | extern int drbd_md_test_flag(struct drbd_backing_dev *, int); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1068 | extern void drbd_md_mark_dirty(struct drbd_device *device); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1069 | extern void drbd_queue_bitmap_io(struct drbd_device *device, |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1070 | int (*io_fn)(struct drbd_device *, struct drbd_peer_device *), |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1071 | void (*done)(struct drbd_device *, int), |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1072 | char *why, enum bm_flag flags, |
| 1073 | struct drbd_peer_device *peer_device); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1074 | extern int drbd_bitmap_io(struct drbd_device *device, |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1075 | int (*io_fn)(struct drbd_device *, struct drbd_peer_device *), |
| 1076 | char *why, enum bm_flag flags, |
| 1077 | struct drbd_peer_device *peer_device); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1078 | extern int drbd_bitmap_io_from_worker(struct drbd_device *device, |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1079 | int (*io_fn)(struct drbd_device *, struct drbd_peer_device *), |
| 1080 | char *why, enum bm_flag flags, |
| 1081 | struct drbd_peer_device *peer_device); |
| 1082 | extern int drbd_bmio_set_n_write(struct drbd_device *device, |
| 1083 | struct drbd_peer_device *peer_device) __must_hold(local); |
| 1084 | extern int drbd_bmio_clear_n_write(struct drbd_device *device, |
| 1085 | struct drbd_peer_device *peer_device) __must_hold(local); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1086 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1087 | /* Meta data layout |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1088 | * |
| 1089 | * We currently have two possible layouts. |
| 1090 | * Offsets in (512 byte) sectors. |
| 1091 | * external: |
| 1092 | * |----------- md_size_sect ------------------| |
| 1093 | * [ 4k superblock ][ activity log ][ Bitmap ] |
| 1094 | * | al_offset == 8 | |
| 1095 | * | bm_offset = al_offset + X | |
| 1096 | * ==> bitmap sectors = md_size_sect - bm_offset |
| 1097 | * |
| 1098 | * Variants: |
| 1099 | * old, indexed fixed size meta data: |
| 1100 | * |
| 1101 | * internal: |
| 1102 | * |----------- md_size_sect ------------------| |
| 1103 | * [data.....][ Bitmap ][ activity log ][ 4k superblock ][padding*] |
| 1104 | * | al_offset < 0 | |
| 1105 | * | bm_offset = al_offset - Y | |
| 1106 | * ==> bitmap sectors = Y = al_offset - bm_offset |
| 1107 | * |
| 1108 | * [padding*] are zero or up to 7 unused 512 Byte sectors to the |
| 1109 | * end of the device, so that the [4k superblock] will be 4k aligned. |
| 1110 | * |
| 1111 | * The activity log consists of 4k transaction blocks, |
| 1112 | * which are written in a ring-buffer, or striped ring-buffer like fashion, |
| 1113 | * which are writtensize used to be fixed 32kB, |
| 1114 | * but is about to become configurable. |
| 1115 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1116 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1117 | /* Our old fixed size meta data layout |
| 1118 | * allows up to about 3.8TB, so if you want more, |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 1119 | * you need to use the "flexible" meta data format. */ |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1120 | #define MD_128MB_SECT (128LLU << 11) /* 128 MB, unit sectors */ |
| 1121 | #define MD_4kB_SECT 8 |
| 1122 | #define MD_32kB_SECT 64 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1123 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 1124 | /* One activity log extent represents 4M of storage */ |
| 1125 | #define AL_EXTENT_SHIFT 22 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1126 | #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT) |
| 1127 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 1128 | /* We could make these currently hardcoded constants configurable |
| 1129 | * variables at create-md time (or even re-configurable at runtime?). |
| 1130 | * Which will require some more changes to the DRBD "super block" |
| 1131 | * and attach code. |
| 1132 | * |
| 1133 | * updates per transaction: |
| 1134 | * This many changes to the active set can be logged with one transaction. |
| 1135 | * This number is arbitrary. |
| 1136 | * context per transaction: |
| 1137 | * This many context extent numbers are logged with each transaction. |
| 1138 | * This number is resulting from the transaction block size (4k), the layout |
| 1139 | * of the transaction header, and the number of updates per transaction. |
| 1140 | * See drbd_actlog.c:struct al_transaction_on_disk |
| 1141 | * */ |
| 1142 | #define AL_UPDATES_PER_TRANSACTION 64 // arbitrary |
| 1143 | #define AL_CONTEXT_PER_TRANSACTION 919 // (4096 - 36 - 6*64)/4 |
| 1144 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1145 | #if BITS_PER_LONG == 32 |
| 1146 | #define LN2_BPL 5 |
| 1147 | #define cpu_to_lel(A) cpu_to_le32(A) |
| 1148 | #define lel_to_cpu(A) le32_to_cpu(A) |
| 1149 | #elif BITS_PER_LONG == 64 |
| 1150 | #define LN2_BPL 6 |
| 1151 | #define cpu_to_lel(A) cpu_to_le64(A) |
| 1152 | #define lel_to_cpu(A) le64_to_cpu(A) |
| 1153 | #else |
| 1154 | #error "LN2 of BITS_PER_LONG unknown!" |
| 1155 | #endif |
| 1156 | |
| 1157 | /* resync bitmap */ |
| 1158 | /* 16MB sized 'bitmap extent' to track syncer usage */ |
| 1159 | struct bm_extent { |
| 1160 | int rs_left; /* number of bits set (out of sync) in this extent. */ |
| 1161 | int rs_failed; /* number of failed resync requests in this extent. */ |
| 1162 | unsigned long flags; |
| 1163 | struct lc_element lce; |
| 1164 | }; |
| 1165 | |
| 1166 | #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */ |
| 1167 | #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */ |
Philipp Reisner | e3555d8 | 2010-11-07 15:56:29 +0100 | [diff] [blame] | 1168 | #define BME_PRIORITY 2 /* finish resync IO on this extent ASAP! App IO waiting! */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1169 | |
| 1170 | /* drbd_bitmap.c */ |
| 1171 | /* |
| 1172 | * We need to store one bit for a block. |
| 1173 | * Example: 1GB disk @ 4096 byte blocks ==> we need 32 KB bitmap. |
| 1174 | * Bit 0 ==> local node thinks this block is binary identical on both nodes |
| 1175 | * Bit 1 ==> local node thinks this block needs to be synced. |
| 1176 | */ |
| 1177 | |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 1178 | #define SLEEP_TIME (HZ/10) |
| 1179 | |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1180 | /* We do bitmap IO in units of 4k blocks. |
| 1181 | * We also still have a hardcoded 4k per bit relation. */ |
| 1182 | #define BM_BLOCK_SHIFT 12 /* 4k per bit */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1183 | #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT) |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1184 | /* mostly arbitrarily set the represented size of one bitmap extent, |
| 1185 | * aka resync extent, to 16 MiB (which is also 512 Byte worth of bitmap |
| 1186 | * at 4k per bit resolution) */ |
| 1187 | #define BM_EXT_SHIFT 24 /* 16 MiB per resync extent */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1188 | #define BM_EXT_SIZE (1<<BM_EXT_SHIFT) |
| 1189 | |
| 1190 | #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12) |
| 1191 | #error "HAVE YOU FIXED drbdmeta AS WELL??" |
| 1192 | #endif |
| 1193 | |
| 1194 | /* thus many _storage_ sectors are described by one bit */ |
| 1195 | #define BM_SECT_TO_BIT(x) ((x)>>(BM_BLOCK_SHIFT-9)) |
| 1196 | #define BM_BIT_TO_SECT(x) ((sector_t)(x)<<(BM_BLOCK_SHIFT-9)) |
| 1197 | #define BM_SECT_PER_BIT BM_BIT_TO_SECT(1) |
| 1198 | |
| 1199 | /* bit to represented kilo byte conversion */ |
| 1200 | #define Bit2KB(bits) ((bits)<<(BM_BLOCK_SHIFT-10)) |
| 1201 | |
| 1202 | /* in which _bitmap_ extent (resp. sector) the bit for a certain |
| 1203 | * _storage_ sector is located in */ |
| 1204 | #define BM_SECT_TO_EXT(x) ((x)>>(BM_EXT_SHIFT-9)) |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1205 | #define BM_BIT_TO_EXT(x) ((x) >> (BM_EXT_SHIFT - BM_BLOCK_SHIFT)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1206 | |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1207 | /* first storage sector a bitmap extent corresponds to */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1208 | #define BM_EXT_TO_SECT(x) ((sector_t)(x) << (BM_EXT_SHIFT-9)) |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1209 | /* how much _storage_ sectors we have per bitmap extent */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1210 | #define BM_SECT_PER_EXT BM_EXT_TO_SECT(1) |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1211 | /* how many bits are covered by one bitmap extent (resync extent) */ |
| 1212 | #define BM_BITS_PER_EXT (1UL << (BM_EXT_SHIFT - BM_BLOCK_SHIFT)) |
| 1213 | |
| 1214 | #define BM_BLOCKS_PER_BM_EXT_MASK (BM_BITS_PER_EXT - 1) |
| 1215 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1216 | |
| 1217 | /* in one sector of the bitmap, we have this many activity_log extents. */ |
| 1218 | #define AL_EXT_PER_BM_SECT (1 << (BM_EXT_SHIFT - AL_EXTENT_SHIFT)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1219 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1220 | /* the extent in "PER_EXTENT" below is an activity log extent |
| 1221 | * we need that many (long words/bytes) to store the bitmap |
| 1222 | * of one AL_EXTENT_SIZE chunk of storage. |
| 1223 | * we can store the bitmap for that many AL_EXTENTS within |
| 1224 | * one sector of the _on_disk_ bitmap: |
| 1225 | * bit 0 bit 37 bit 38 bit (512*8)-1 |
| 1226 | * ...|........|........|.. // ..|........| |
| 1227 | * sect. 0 `296 `304 ^(512*8*8)-1 |
| 1228 | * |
| 1229 | #define BM_WORDS_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / BITS_PER_LONG ) |
| 1230 | #define BM_BYTES_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / 8 ) // 128 |
| 1231 | #define BM_EXT_PER_SECT ( 512 / BM_BYTES_PER_EXTENT ) // 4 |
| 1232 | */ |
| 1233 | |
| 1234 | #define DRBD_MAX_SECTORS_32 (0xffffffffLU) |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1235 | /* we have a certain meta data variant that has a fixed on-disk size of 128 |
| 1236 | * MiB, of which 4k are our "superblock", and 32k are the fixed size activity |
| 1237 | * log, leaving this many sectors for the bitmap. |
| 1238 | */ |
| 1239 | |
| 1240 | #define DRBD_MAX_SECTORS_FIXED_BM \ |
| 1241 | ((MD_128MB_SECT - MD_32kB_SECT - MD_4kB_SECT) * (1LL<<(BM_EXT_SHIFT-9))) |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1242 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_FIXED_BM |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1243 | /* 16 TB in units of sectors */ |
| 1244 | #if BITS_PER_LONG == 32 |
| 1245 | /* adjust by one page worth of bitmap, |
| 1246 | * so we won't wrap around in drbd_bm_find_next_bit. |
| 1247 | * you should use 64bit OS for that much storage, anyways. */ |
| 1248 | #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) |
| 1249 | #else |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1250 | /* we allow up to 1 PiB now on 64bit architecture with "flexible" meta data */ |
| 1251 | #define DRBD_MAX_SECTORS_FLEX (1UL << 51) |
| 1252 | /* corresponds to (1UL << 38) bits right now. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1253 | #endif |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1254 | |
Ming Lei | 8bf223c | 2016-05-30 21:34:35 +0800 | [diff] [blame] | 1255 | /* Estimate max bio size as 256 * PAGE_SIZE, |
Kirill A. Shutemov | ea1754a | 2016-04-01 15:29:48 +0300 | [diff] [blame] | 1256 | * so for typical PAGE_SIZE of 4k, that is (1<<20) Byte. |
Lars Ellenberg | 23361cf | 2011-03-31 16:36:43 +0200 | [diff] [blame] | 1257 | * Since we may live in a mixed-platform cluster, |
| 1258 | * we limit us to a platform agnostic constant here for now. |
| 1259 | * A followup commit may allow even bigger BIO sizes, |
| 1260 | * once we thought that through. */ |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 1261 | #define DRBD_MAX_BIO_SIZE (1U << 20) |
Christoph Hellwig | a8affc0 | 2021-03-11 12:01:37 +0100 | [diff] [blame] | 1262 | #if DRBD_MAX_BIO_SIZE > (BIO_MAX_VECS << PAGE_SHIFT) |
Lars Ellenberg | 23361cf | 2011-03-31 16:36:43 +0200 | [diff] [blame] | 1263 | #error Architecture not supported: DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE |
| 1264 | #endif |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 1265 | #define DRBD_MAX_BIO_SIZE_SAFE (1U << 12) /* Works always = 4k */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1266 | |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 1267 | #define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* Header 80 only allows packets up to 32KiB data */ |
| 1268 | #define DRBD_MAX_BIO_SIZE_P95 (1U << 17) /* Protocol 95 to 99 allows bios up to 128KiB */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1269 | |
Lars Ellenberg | 505675f | 2016-06-14 00:26:23 +0200 | [diff] [blame] | 1270 | /* For now, don't allow more than half of what we can "activate" in one |
| 1271 | * activity log transaction to be discarded in one go. We may need to rework |
| 1272 | * drbd_al_begin_io() to allow for even larger discard ranges */ |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 1273 | #define DRBD_MAX_BATCH_BIO_SIZE (AL_UPDATES_PER_TRANSACTION/2*AL_EXTENT_SIZE) |
| 1274 | #define DRBD_MAX_BBIO_SECTORS (DRBD_MAX_BATCH_BIO_SIZE >> 9) |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 1275 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1276 | extern int drbd_bm_init(struct drbd_device *device); |
| 1277 | extern int drbd_bm_resize(struct drbd_device *device, sector_t sectors, int set_new_bits); |
| 1278 | extern void drbd_bm_cleanup(struct drbd_device *device); |
| 1279 | extern void drbd_bm_set_all(struct drbd_device *device); |
| 1280 | extern void drbd_bm_clear_all(struct drbd_device *device); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1281 | /* set/clear/test only a few bits at a time */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1282 | extern int drbd_bm_set_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1283 | struct drbd_device *device, unsigned long s, unsigned long e); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1284 | extern int drbd_bm_clear_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1285 | struct drbd_device *device, unsigned long s, unsigned long e); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1286 | extern int drbd_bm_count_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1287 | struct drbd_device *device, const unsigned long s, const unsigned long e); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1288 | /* bm_set_bits variant for use while holding drbd_bm_lock, |
| 1289 | * may process the whole bitmap in one go */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1290 | extern void _drbd_bm_set_bits(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1291 | const unsigned long s, const unsigned long e); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1292 | extern int drbd_bm_test_bit(struct drbd_device *device, unsigned long bitnr); |
| 1293 | extern int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr); |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1294 | extern int drbd_bm_read(struct drbd_device *device, |
| 1295 | struct drbd_peer_device *peer_device) __must_hold(local); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1296 | extern void drbd_bm_mark_for_writeout(struct drbd_device *device, int page_nr); |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1297 | extern int drbd_bm_write(struct drbd_device *device, |
| 1298 | struct drbd_peer_device *peer_device) __must_hold(local); |
Lars Ellenberg | 27ea1d8 | 2016-06-14 00:26:38 +0200 | [diff] [blame] | 1299 | extern void drbd_bm_reset_al_hints(struct drbd_device *device) __must_hold(local); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1300 | extern int drbd_bm_write_hinted(struct drbd_device *device) __must_hold(local); |
Lars Ellenberg | c7a58db | 2013-12-20 11:39:48 +0100 | [diff] [blame] | 1301 | extern int drbd_bm_write_lazy(struct drbd_device *device, unsigned upper_idx) __must_hold(local); |
Andreas Gruenbacher | 8164dd6 | 2023-03-30 12:27:40 +0200 | [diff] [blame] | 1302 | extern int drbd_bm_write_all(struct drbd_device *device, |
| 1303 | struct drbd_peer_device *peer_device) __must_hold(local); |
| 1304 | extern int drbd_bm_write_copy_pages(struct drbd_device *device, |
| 1305 | struct drbd_peer_device *peer_device) __must_hold(local); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1306 | extern size_t drbd_bm_words(struct drbd_device *device); |
| 1307 | extern unsigned long drbd_bm_bits(struct drbd_device *device); |
| 1308 | extern sector_t drbd_bm_capacity(struct drbd_device *device); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1309 | |
| 1310 | #define DRBD_END_OF_BITMAP (~(unsigned long)0) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1311 | extern unsigned long drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1312 | /* bm_find_next variants for use while you hold drbd_bm_lock() */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1313 | extern unsigned long _drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); |
| 1314 | extern unsigned long _drbd_bm_find_next_zero(struct drbd_device *device, unsigned long bm_fo); |
| 1315 | extern unsigned long _drbd_bm_total_weight(struct drbd_device *device); |
| 1316 | extern unsigned long drbd_bm_total_weight(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1317 | /* for receive_bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1318 | extern void drbd_bm_merge_lel(struct drbd_device *device, size_t offset, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1319 | size_t number, unsigned long *buffer); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1320 | /* for _drbd_send_bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1321 | extern void drbd_bm_get_lel(struct drbd_device *device, size_t offset, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1322 | size_t number, unsigned long *buffer); |
| 1323 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1324 | extern void drbd_bm_lock(struct drbd_device *device, char *why, enum bm_flag flags); |
| 1325 | extern void drbd_bm_unlock(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1326 | /* drbd_main.c */ |
| 1327 | |
| 1328 | extern struct kmem_cache *drbd_request_cache; |
Andreas Gruenbacher | 6c852be | 2011-02-04 15:38:52 +0100 | [diff] [blame] | 1329 | extern struct kmem_cache *drbd_ee_cache; /* peer requests */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1330 | extern struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
| 1331 | extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
Kent Overstreet | 0892fac | 2018-05-20 18:25:48 -0400 | [diff] [blame] | 1332 | extern mempool_t drbd_request_mempool; |
| 1333 | extern mempool_t drbd_ee_mempool; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1334 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1335 | /* drbd's page pool, used to buffer data received from the peer, |
| 1336 | * or data requested by the peer. |
| 1337 | * |
| 1338 | * This does not have an emergency reserve. |
| 1339 | * |
| 1340 | * When allocating from this pool, it first takes pages from the pool. |
| 1341 | * Only if the pool is depleted will try to allocate from the system. |
| 1342 | * |
| 1343 | * The assumption is that pages taken from this pool will be processed, |
| 1344 | * and given back, "quickly", and then can be recycled, so we can avoid |
| 1345 | * frequent calls to alloc_page(), and still will be able to make progress even |
| 1346 | * under memory pressure. |
| 1347 | */ |
| 1348 | extern struct page *drbd_pp_pool; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1349 | extern spinlock_t drbd_pp_lock; |
| 1350 | extern int drbd_pp_vacant; |
| 1351 | extern wait_queue_head_t drbd_pp_wait; |
| 1352 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1353 | /* We also need a standard (emergency-reserve backed) page pool |
| 1354 | * for meta data IO (activity log, bitmap). |
| 1355 | * We can keep it global, as long as it is used as "N pages at a time". |
| 1356 | * 128 should be plenty, currently we probably can get away with as few as 1. |
| 1357 | */ |
| 1358 | #define DRBD_MIN_POOL_PAGES 128 |
Kent Overstreet | 0892fac | 2018-05-20 18:25:48 -0400 | [diff] [blame] | 1359 | extern mempool_t drbd_md_io_page_pool; |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1360 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 1361 | /* We also need to make sure we get a bio |
| 1362 | * when we need it for housekeeping purposes */ |
Kent Overstreet | 0892fac | 2018-05-20 18:25:48 -0400 | [diff] [blame] | 1363 | extern struct bio_set drbd_md_io_bio_set; |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 1364 | |
NeilBrown | 8cb0def | 2017-06-18 14:38:58 +1000 | [diff] [blame] | 1365 | /* And a bio_set for cloning */ |
Kent Overstreet | 0892fac | 2018-05-20 18:25:48 -0400 | [diff] [blame] | 1366 | extern struct bio_set drbd_io_bio_set; |
NeilBrown | 8cb0def | 2017-06-18 14:38:58 +1000 | [diff] [blame] | 1367 | |
Andreas Gruenbacher | 28bc3b8 | 2014-08-14 18:33:30 +0200 | [diff] [blame] | 1368 | extern struct mutex resources_mutex; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1369 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1370 | extern int conn_lowest_minor(struct drbd_connection *connection); |
Lars Ellenberg | a910b12 | 2014-04-28 18:43:21 +0200 | [diff] [blame] | 1371 | extern enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor); |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 1372 | extern void drbd_destroy_device(struct kref *kref); |
Lars Ellenberg | a910b12 | 2014-04-28 18:43:21 +0200 | [diff] [blame] | 1373 | extern void drbd_delete_device(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1374 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 1375 | extern struct drbd_resource *drbd_create_resource(const char *name); |
| 1376 | extern void drbd_free_resource(struct drbd_resource *resource); |
| 1377 | |
Andreas Gruenbacher | eb6bea6 | 2011-06-21 16:11:28 +0200 | [diff] [blame] | 1378 | extern int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1379 | extern struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts); |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 1380 | extern void drbd_destroy_connection(struct kref *kref); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1381 | extern struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len, |
Andreas Gruenbacher | 089c075 | 2011-06-14 18:28:09 +0200 | [diff] [blame] | 1382 | void *peer_addr, int peer_addr_len); |
Andreas Gruenbacher | 4bc7604 | 2011-06-13 14:27:45 +0200 | [diff] [blame] | 1383 | extern struct drbd_resource *drbd_find_resource(const char *name); |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 1384 | extern void drbd_destroy_resource(struct kref *kref); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1385 | extern void conn_free_crypto(struct drbd_connection *connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1386 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1387 | /* drbd_req */ |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 1388 | extern void do_submit(struct work_struct *ws); |
Guoqing Jiang | 370276b | 2021-01-21 15:21:50 +0100 | [diff] [blame] | 1389 | extern void __drbd_make_request(struct drbd_device *, struct bio *); |
Christoph Hellwig | 3e08773 | 2021-10-12 13:12:24 +0200 | [diff] [blame] | 1390 | void drbd_submit_bio(struct bio *bio); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1391 | extern int drbd_read_remote(struct drbd_device *device, struct drbd_request *req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1392 | extern int is_valid_ar_handle(struct drbd_request *, sector_t); |
| 1393 | |
| 1394 | |
| 1395 | /* drbd_nl.c */ |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1396 | |
| 1397 | extern struct mutex notification_mutex; |
| 1398 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1399 | extern void drbd_suspend_io(struct drbd_device *device); |
| 1400 | extern void drbd_resume_io(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1401 | extern char *ppsize(char *buf, unsigned long long size); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1402 | extern sector_t drbd_new_dev_size(struct drbd_device *, struct drbd_backing_dev *, sector_t, int); |
Philipp Reisner | e96c963 | 2013-06-25 16:50:07 +0200 | [diff] [blame] | 1403 | enum determine_dev_size { |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 1404 | DS_ERROR_SHRINK = -3, |
| 1405 | DS_ERROR_SPACE_MD = -2, |
Philipp Reisner | e96c963 | 2013-06-25 16:50:07 +0200 | [diff] [blame] | 1406 | DS_ERROR = -1, |
| 1407 | DS_UNCHANGED = 0, |
| 1408 | DS_SHRUNK = 1, |
Philipp Reisner | 57737ad | 2013-10-23 10:59:17 +0200 | [diff] [blame] | 1409 | DS_GREW = 2, |
| 1410 | DS_GREW_FROM_ZERO = 3, |
Philipp Reisner | e96c963 | 2013-06-25 16:50:07 +0200 | [diff] [blame] | 1411 | }; |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 1412 | extern enum determine_dev_size |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1413 | drbd_determine_dev_size(struct drbd_device *, enum dds_flags, struct resize_parms *) __must_hold(local); |
| 1414 | extern void resync_after_online_grow(struct drbd_device *); |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 1415 | extern void drbd_reconsider_queue_parameters(struct drbd_device *device, |
| 1416 | struct drbd_backing_dev *bdev, struct o_qlim *o); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1417 | extern enum drbd_state_rv drbd_set_role(struct drbd_device *device, |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1418 | enum drbd_role new_role, |
| 1419 | int force); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1420 | extern bool conn_try_outdate_peer(struct drbd_connection *connection); |
| 1421 | extern void conn_try_outdate_peer_async(struct drbd_connection *connection); |
Fabian Frederick | 7e5fec3 | 2016-06-14 00:26:35 +0200 | [diff] [blame] | 1422 | extern enum drbd_peer_state conn_khelper(struct drbd_connection *connection, char *cmd); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1423 | extern int drbd_khelper(struct drbd_device *device, char *cmd); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1424 | |
| 1425 | /* drbd_worker.c */ |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1426 | /* bi_end_io handlers */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1427 | extern void drbd_md_endio(struct bio *bio); |
| 1428 | extern void drbd_peer_request_endio(struct bio *bio); |
| 1429 | extern void drbd_request_endio(struct bio *bio); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1430 | extern int drbd_worker(struct drbd_thread *thi); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1431 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor); |
| 1432 | void drbd_resync_after_changed(struct drbd_device *device); |
| 1433 | extern void drbd_start_resync(struct drbd_device *device, enum drbd_conns side); |
| 1434 | extern void resume_next_sg(struct drbd_device *device); |
| 1435 | extern void suspend_other_sg(struct drbd_device *device); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1436 | extern int drbd_resync_finished(struct drbd_peer_device *peer_device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1437 | /* maybe rather drbd_main.c ? */ |
Lars Ellenberg | e37d243 | 2014-04-01 23:53:30 +0200 | [diff] [blame] | 1438 | extern void *drbd_md_get_buffer(struct drbd_device *device, const char *intent); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1439 | extern void drbd_md_put_buffer(struct drbd_device *device); |
| 1440 | extern int drbd_md_sync_page_io(struct drbd_device *device, |
Bart Van Assche | 9945172 | 2022-07-14 11:06:39 -0700 | [diff] [blame] | 1441 | struct drbd_backing_dev *bdev, sector_t sector, enum req_op op); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1442 | extern void drbd_ov_out_of_sync_found(struct drbd_peer_device *peer_device, |
| 1443 | sector_t sector, int size); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1444 | extern void wait_until_done_or_force_detached(struct drbd_device *device, |
Lars Ellenberg | 44edfb0 | 2012-09-27 13:03:45 +0200 | [diff] [blame] | 1445 | struct drbd_backing_dev *bdev, unsigned int *done); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1446 | extern void drbd_rs_controller_reset(struct drbd_peer_device *peer_device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1447 | |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1448 | static inline void ov_out_of_sync_print(struct drbd_peer_device *peer_device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1449 | { |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1450 | struct drbd_device *device = peer_device->device; |
| 1451 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1452 | if (device->ov_last_oos_size) { |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1453 | drbd_err(peer_device, "Out of sync: start=%llu, size=%lu (sectors)\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1454 | (unsigned long long)device->ov_last_oos_start, |
| 1455 | (unsigned long)device->ov_last_oos_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1456 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1457 | device->ov_last_oos_size = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1458 | } |
| 1459 | |
| 1460 | |
Kees Cook | 3d0e637 | 2018-08-06 16:32:16 -0700 | [diff] [blame] | 1461 | extern void drbd_csum_bio(struct crypto_shash *, struct bio *, void *); |
| 1462 | extern void drbd_csum_ee(struct crypto_shash *, struct drbd_peer_request *, |
| 1463 | void *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1464 | /* worker callbacks */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1465 | extern int w_e_end_data_req(struct drbd_work *, int); |
| 1466 | extern int w_e_end_rsdata_req(struct drbd_work *, int); |
| 1467 | extern int w_e_end_csum_rs_req(struct drbd_work *, int); |
| 1468 | extern int w_e_end_ov_reply(struct drbd_work *, int); |
| 1469 | extern int w_e_end_ov_req(struct drbd_work *, int); |
| 1470 | extern int w_ov_finished(struct drbd_work *, int); |
| 1471 | extern int w_resync_timer(struct drbd_work *, int); |
| 1472 | extern int w_send_write_hint(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1473 | extern int w_send_dblock(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1474 | extern int w_send_read_req(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1475 | extern int w_e_reissue(struct drbd_work *, int); |
| 1476 | extern int w_restart_disk_io(struct drbd_work *, int); |
Andreas Gruenbacher | 8f7bed7 | 2010-12-19 23:53:14 +0100 | [diff] [blame] | 1477 | extern int w_send_out_of_sync(struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1478 | |
Kees Cook | 2bccef3 | 2017-10-17 20:33:01 -0700 | [diff] [blame] | 1479 | extern void resync_timer_fn(struct timer_list *t); |
| 1480 | extern void start_resync_timer_fn(struct timer_list *t); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1481 | |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 1482 | extern void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req); |
| 1483 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1484 | /* drbd_receiver.c */ |
Lars Ellenberg | f31e583 | 2018-12-20 17:23:42 +0100 | [diff] [blame] | 1485 | extern int drbd_issue_discard_or_zero_out(struct drbd_device *device, |
| 1486 | sector_t start, unsigned int nr_sectors, int flags); |
Andreas Gruenbacher | 753c6191 | 2011-07-22 11:14:41 +0200 | [diff] [blame] | 1487 | extern int drbd_receiver(struct drbd_thread *thi); |
Philipp Reisner | 1c03e52 | 2015-03-16 15:01:00 +0100 | [diff] [blame] | 1488 | extern int drbd_ack_receiver(struct drbd_thread *thi); |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1489 | extern void drbd_send_ping_wf(struct work_struct *ws); |
| 1490 | extern void drbd_send_acks_wf(struct work_struct *ws); |
Lars Ellenberg | e829987 | 2014-04-28 18:43:19 +0200 | [diff] [blame] | 1491 | extern bool drbd_rs_c_min_rate_throttle(struct drbd_device *device); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1492 | extern bool drbd_rs_should_slow_down(struct drbd_peer_device *peer_device, sector_t sector, |
Lars Ellenberg | ad3fee7 | 2013-12-20 11:22:13 +0100 | [diff] [blame] | 1493 | bool throttle_if_app_is_waiting); |
Christoph Böhmwalder | ce668b6 | 2022-11-09 14:34:53 +0100 | [diff] [blame] | 1494 | extern int drbd_submit_peer_request(struct drbd_peer_request *peer_req); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1495 | extern int drbd_free_peer_reqs(struct drbd_device *, struct list_head *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1496 | extern struct drbd_peer_request *drbd_alloc_peer_req(struct drbd_peer_device *, u64, |
Andreas Gruenbacher | 0db5536 | 2011-04-06 16:09:15 +0200 | [diff] [blame] | 1497 | sector_t, unsigned int, |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 1498 | unsigned int, |
Andreas Gruenbacher | 0db5536 | 2011-04-06 16:09:15 +0200 | [diff] [blame] | 1499 | gfp_t) __must_hold(local); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1500 | extern void __drbd_free_peer_req(struct drbd_device *, struct drbd_peer_request *, |
Andreas Gruenbacher | 3967deb | 2011-04-06 16:16:56 +0200 | [diff] [blame] | 1501 | int); |
| 1502 | #define drbd_free_peer_req(m,e) __drbd_free_peer_req(m, e, 0) |
| 1503 | #define drbd_free_net_peer_req(m,e) __drbd_free_peer_req(m, e, 1) |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1504 | extern struct page *drbd_alloc_pages(struct drbd_peer_device *, unsigned int, bool); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1505 | extern void drbd_set_recv_tcq(struct drbd_device *device, int tcq_enabled); |
| 1506 | extern void _drbd_clear_done_ee(struct drbd_device *device, struct list_head *to_be_freed); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1507 | extern int drbd_connected(struct drbd_peer_device *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1508 | |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1509 | /* sets the number of 512 byte sectors of our virtual device */ |
Lars Ellenberg | d5412e8 | 2018-12-20 17:23:30 +0100 | [diff] [blame] | 1510 | void drbd_set_my_capacity(struct drbd_device *device, sector_t size); |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1511 | |
| 1512 | /* |
| 1513 | * used to submit our private bio |
| 1514 | */ |
Christoph Hellwig | ed00aab | 2020-07-01 10:59:44 +0200 | [diff] [blame] | 1515 | static inline void drbd_submit_bio_noacct(struct drbd_device *device, |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1516 | int fault_type, struct bio *bio) |
| 1517 | { |
| 1518 | __release(local); |
Christoph Hellwig | 309dca30 | 2021-01-24 11:02:34 +0100 | [diff] [blame] | 1519 | if (!bio->bi_bdev) { |
| 1520 | drbd_err(device, "drbd_submit_bio_noacct: bio->bi_bdev == NULL\n"); |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 1521 | bio->bi_status = BLK_STS_IOERR; |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1522 | bio_endio(bio); |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1523 | return; |
| 1524 | } |
| 1525 | |
| 1526 | if (drbd_insert_fault(device, fault_type)) |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1527 | bio_io_error(bio); |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1528 | else |
Christoph Hellwig | ed00aab | 2020-07-01 10:59:44 +0200 | [diff] [blame] | 1529 | submit_bio_noacct(bio); |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1530 | } |
| 1531 | |
Philipp Reisner | 8fe39aa | 2013-11-22 13:22:13 +0100 | [diff] [blame] | 1532 | void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
| 1533 | enum write_ordering_e wo); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1534 | |
| 1535 | /* drbd_proc.c */ |
| 1536 | extern struct proc_dir_entry *drbd_proc; |
Christoph Hellwig | 004fd11 | 2018-04-11 16:46:11 +0200 | [diff] [blame] | 1537 | int drbd_seq_show(struct seq_file *seq, void *v); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1538 | |
| 1539 | /* drbd_actlog.c */ |
Lars Ellenberg | e4d7d6f | 2014-04-28 18:43:28 +0200 | [diff] [blame] | 1540 | extern bool drbd_al_begin_io_prepare(struct drbd_device *device, struct drbd_interval *i); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1541 | extern int drbd_al_begin_io_nonblock(struct drbd_device *device, struct drbd_interval *i); |
Lars Ellenberg | 4dd726f | 2014-02-11 11:15:36 +0100 | [diff] [blame] | 1542 | extern void drbd_al_begin_io_commit(struct drbd_device *device); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1543 | extern bool drbd_al_begin_io_fastpath(struct drbd_device *device, struct drbd_interval *i); |
Lars Ellenberg | 4dd726f | 2014-02-11 11:15:36 +0100 | [diff] [blame] | 1544 | extern void drbd_al_begin_io(struct drbd_device *device, struct drbd_interval *i); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1545 | extern void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i); |
| 1546 | extern void drbd_rs_complete_io(struct drbd_device *device, sector_t sector); |
| 1547 | extern int drbd_rs_begin_io(struct drbd_device *device, sector_t sector); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1548 | extern int drbd_try_rs_begin_io(struct drbd_peer_device *peer_device, sector_t sector); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1549 | extern void drbd_rs_cancel_all(struct drbd_device *device); |
| 1550 | extern int drbd_rs_del_all(struct drbd_device *device); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1551 | extern void drbd_rs_failed_io(struct drbd_peer_device *peer_device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1552 | sector_t sector, int size); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1553 | extern void drbd_advance_rs_marks(struct drbd_peer_device *peer_device, unsigned long still_to_go); |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1554 | |
| 1555 | enum update_sync_bits_mode { RECORD_RS_FAILED, SET_OUT_OF_SYNC, SET_IN_SYNC }; |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1556 | extern int __drbd_change_sync(struct drbd_peer_device *peer_device, sector_t sector, int size, |
Andreas Gruenbacher | 179e20b8 | 2014-11-10 17:21:09 +0100 | [diff] [blame] | 1557 | enum update_sync_bits_mode mode); |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1558 | #define drbd_set_in_sync(peer_device, sector, size) \ |
| 1559 | __drbd_change_sync(peer_device, sector, size, SET_IN_SYNC) |
| 1560 | #define drbd_set_out_of_sync(peer_device, sector, size) \ |
| 1561 | __drbd_change_sync(peer_device, sector, size, SET_OUT_OF_SYNC) |
| 1562 | #define drbd_rs_failed_io(peer_device, sector, size) \ |
| 1563 | __drbd_change_sync(peer_device, sector, size, RECORD_RS_FAILED) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1564 | extern void drbd_al_shrink(struct drbd_device *device); |
Lars Ellenberg | 5f7c012 | 2015-06-08 15:18:45 +0200 | [diff] [blame] | 1565 | extern int drbd_al_initialize(struct drbd_device *, void *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1566 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1567 | /* drbd_nl.c */ |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 1568 | /* state info broadcast */ |
| 1569 | struct sib_info { |
| 1570 | enum drbd_state_info_bcast_reason sib_reason; |
| 1571 | union { |
| 1572 | struct { |
| 1573 | char *helper_name; |
| 1574 | unsigned helper_exit_code; |
| 1575 | }; |
| 1576 | struct { |
| 1577 | union drbd_state os; |
| 1578 | union drbd_state ns; |
| 1579 | }; |
| 1580 | }; |
| 1581 | }; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1582 | void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1583 | |
Lv Yunlong | aadb22b | 2022-04-06 21:04:43 +0200 | [diff] [blame] | 1584 | extern int notify_resource_state(struct sk_buff *, |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1585 | unsigned int, |
| 1586 | struct drbd_resource *, |
| 1587 | struct resource_info *, |
| 1588 | enum drbd_notification_type); |
Lv Yunlong | aadb22b | 2022-04-06 21:04:43 +0200 | [diff] [blame] | 1589 | extern int notify_device_state(struct sk_buff *, |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1590 | unsigned int, |
| 1591 | struct drbd_device *, |
| 1592 | struct device_info *, |
| 1593 | enum drbd_notification_type); |
Lv Yunlong | aadb22b | 2022-04-06 21:04:43 +0200 | [diff] [blame] | 1594 | extern int notify_connection_state(struct sk_buff *, |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1595 | unsigned int, |
| 1596 | struct drbd_connection *, |
| 1597 | struct connection_info *, |
| 1598 | enum drbd_notification_type); |
Lv Yunlong | aadb22b | 2022-04-06 21:04:43 +0200 | [diff] [blame] | 1599 | extern int notify_peer_device_state(struct sk_buff *, |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1600 | unsigned int, |
| 1601 | struct drbd_peer_device *, |
| 1602 | struct peer_device_info *, |
| 1603 | enum drbd_notification_type); |
| 1604 | extern void notify_helper(enum drbd_notification_type, struct drbd_device *, |
| 1605 | struct drbd_connection *, const char *, int); |
| 1606 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1607 | /* |
| 1608 | * inline helper functions |
| 1609 | *************************/ |
| 1610 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1611 | /* see also page_chain_add and friends in drbd_receiver.c */ |
| 1612 | static inline struct page *page_chain_next(struct page *page) |
| 1613 | { |
| 1614 | return (struct page *)page_private(page); |
| 1615 | } |
| 1616 | #define page_chain_for_each(page) \ |
| 1617 | for (; page && ({ prefetch(page_chain_next(page)); 1; }); \ |
| 1618 | page = page_chain_next(page)) |
| 1619 | #define page_chain_for_each_safe(page, n) \ |
| 1620 | for (; page && ({ n = page_chain_next(page); 1; }); page = n) |
| 1621 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1622 | |
Andreas Gruenbacher | 045417f | 2011-04-07 21:34:24 +0200 | [diff] [blame] | 1623 | static inline int drbd_peer_req_has_active_page(struct drbd_peer_request *peer_req) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1624 | { |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1625 | struct page *page = peer_req->pages; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1626 | page_chain_for_each(page) { |
| 1627 | if (page_count(page) > 1) |
| 1628 | return 1; |
| 1629 | } |
| 1630 | return 0; |
| 1631 | } |
| 1632 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1633 | static inline union drbd_state drbd_read_state(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1634 | { |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 1635 | struct drbd_resource *resource = device->resource; |
Philipp Reisner | 78bae59 | 2011-03-28 15:40:12 +0200 | [diff] [blame] | 1636 | union drbd_state rv; |
| 1637 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1638 | rv.i = device->state.i; |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 1639 | rv.susp = resource->susp; |
| 1640 | rv.susp_nod = resource->susp_nod; |
| 1641 | rv.susp_fen = resource->susp_fen; |
Philipp Reisner | 78bae59 | 2011-03-28 15:40:12 +0200 | [diff] [blame] | 1642 | |
| 1643 | return rv; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1644 | } |
| 1645 | |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1646 | enum drbd_force_detach_flags { |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1647 | DRBD_READ_ERROR, |
| 1648 | DRBD_WRITE_ERROR, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1649 | DRBD_META_IO_ERROR, |
| 1650 | DRBD_FORCE_DETACH, |
| 1651 | }; |
| 1652 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1653 | #define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1654 | static inline void __drbd_chk_io_error_(struct drbd_device *device, |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1655 | enum drbd_force_detach_flags df, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1656 | const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1657 | { |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1658 | enum drbd_io_error_p ep; |
| 1659 | |
| 1660 | rcu_read_lock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1661 | ep = rcu_dereference(device->ldev->disk_conf)->on_io_error; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1662 | rcu_read_unlock(); |
| 1663 | switch (ep) { |
| 1664 | case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */ |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1665 | if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) { |
Christoph Böhmwalder | e3fa02d | 2022-12-01 12:03:49 +0100 | [diff] [blame] | 1666 | if (drbd_ratelimit()) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1667 | drbd_err(device, "Local IO failed in %s.\n", where); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1668 | if (device->state.disk > D_INCONSISTENT) |
| 1669 | _drbd_set_state(_NS(device, disk, D_INCONSISTENT), CS_HARD, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1670 | break; |
| 1671 | } |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 1672 | fallthrough; /* for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1673 | case EP_DETACH: |
| 1674 | case EP_CALL_HELPER: |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1675 | /* Remember whether we saw a READ or WRITE error. |
| 1676 | * |
| 1677 | * Recovery of the affected area for WRITE failure is covered |
| 1678 | * by the activity log. |
| 1679 | * READ errors may fall outside that area though. Certain READ |
| 1680 | * errors can be "healed" by writing good data to the affected |
| 1681 | * blocks, which triggers block re-allocation in lower layers. |
| 1682 | * |
| 1683 | * If we can not write the bitmap after a READ error, |
| 1684 | * we may need to trigger a full sync (see w_go_diskless()). |
| 1685 | * |
| 1686 | * Force-detach is not really an IO error, but rather a |
| 1687 | * desperate measure to try to deal with a completely |
| 1688 | * unresponsive lower level IO stack. |
| 1689 | * Still it should be treated as a WRITE error. |
| 1690 | * |
| 1691 | * Meta IO error is always WRITE error: |
| 1692 | * we read meta data only once during attach, |
| 1693 | * which will fail in case of errors. |
| 1694 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1695 | set_bit(WAS_IO_ERROR, &device->flags); |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1696 | if (df == DRBD_READ_ERROR) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1697 | set_bit(WAS_READ_ERROR, &device->flags); |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1698 | if (df == DRBD_FORCE_DETACH) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1699 | set_bit(FORCE_DETACH, &device->flags); |
| 1700 | if (device->state.disk > D_FAILED) { |
| 1701 | _drbd_set_state(_NS(device, disk, D_FAILED), CS_HARD, NULL); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1702 | drbd_err(device, |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1703 | "Local IO failed in %s. Detaching...\n", where); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1704 | } |
| 1705 | break; |
| 1706 | } |
| 1707 | } |
| 1708 | |
| 1709 | /** |
| 1710 | * drbd_chk_io_error: Handle the on_io_error setting, should be called from all io completion handlers |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1711 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1712 | * @error: Error code passed to the IO completion callback |
| 1713 | * @forcedetach: Force detach. I.e. the error happened while accessing the meta data |
| 1714 | * |
| 1715 | * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED) |
| 1716 | */ |
| 1717 | #define drbd_chk_io_error(m,e,f) drbd_chk_io_error_(m,e,f, __func__) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1718 | static inline void drbd_chk_io_error_(struct drbd_device *device, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1719 | int error, enum drbd_force_detach_flags forcedetach, const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1720 | { |
| 1721 | if (error) { |
| 1722 | unsigned long flags; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1723 | spin_lock_irqsave(&device->resource->req_lock, flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1724 | __drbd_chk_io_error_(device, forcedetach, where); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1725 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1726 | } |
| 1727 | } |
| 1728 | |
| 1729 | |
| 1730 | /** |
| 1731 | * drbd_md_first_sector() - Returns the first sector number of the meta data area |
| 1732 | * @bdev: Meta data block device. |
| 1733 | * |
| 1734 | * BTW, for internal meta data, this happens to be the maximum capacity |
| 1735 | * we could agree upon with our peer node. |
| 1736 | */ |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1737 | static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1738 | { |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1739 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1740 | case DRBD_MD_INDEX_INTERNAL: |
| 1741 | case DRBD_MD_INDEX_FLEX_INT: |
| 1742 | return bdev->md.md_offset + bdev->md.bm_offset; |
| 1743 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1744 | default: |
| 1745 | return bdev->md.md_offset; |
| 1746 | } |
| 1747 | } |
| 1748 | |
| 1749 | /** |
| 1750 | * drbd_md_last_sector() - Return the last sector number of the meta data area |
| 1751 | * @bdev: Meta data block device. |
| 1752 | */ |
| 1753 | static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev) |
| 1754 | { |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1755 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1756 | case DRBD_MD_INDEX_INTERNAL: |
| 1757 | case DRBD_MD_INDEX_FLEX_INT: |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1758 | return bdev->md.md_offset + MD_4kB_SECT -1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1759 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1760 | default: |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1761 | return bdev->md.md_offset + bdev->md.md_size_sect -1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1762 | } |
| 1763 | } |
| 1764 | |
| 1765 | /* Returns the number of 512 byte sectors of the device */ |
| 1766 | static inline sector_t drbd_get_capacity(struct block_device *bdev) |
| 1767 | { |
Christoph Hellwig | da7b392 | 2021-10-18 12:11:04 +0200 | [diff] [blame] | 1768 | return bdev ? bdev_nr_sectors(bdev) : 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1769 | } |
| 1770 | |
| 1771 | /** |
| 1772 | * drbd_get_max_capacity() - Returns the capacity we announce to out peer |
| 1773 | * @bdev: Meta data block device. |
| 1774 | * |
| 1775 | * returns the capacity we announce to out peer. we clip ourselves at the |
| 1776 | * various MAX_SECTORS, because if we don't, current implementation will |
| 1777 | * oops sooner or later |
| 1778 | */ |
| 1779 | static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) |
| 1780 | { |
| 1781 | sector_t s; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1782 | |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1783 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1784 | case DRBD_MD_INDEX_INTERNAL: |
| 1785 | case DRBD_MD_INDEX_FLEX_INT: |
| 1786 | s = drbd_get_capacity(bdev->backing_bdev) |
| 1787 | ? min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1788 | drbd_md_first_sector(bdev)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1789 | : 0; |
| 1790 | break; |
| 1791 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1792 | s = min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
| 1793 | drbd_get_capacity(bdev->backing_bdev)); |
| 1794 | /* clip at maximum size the meta device can support */ |
| 1795 | s = min_t(sector_t, s, |
| 1796 | BM_EXT_TO_SECT(bdev->md.md_size_sect |
| 1797 | - bdev->md.bm_offset)); |
| 1798 | break; |
| 1799 | default: |
| 1800 | s = min_t(sector_t, DRBD_MAX_SECTORS, |
| 1801 | drbd_get_capacity(bdev->backing_bdev)); |
| 1802 | } |
| 1803 | return s; |
| 1804 | } |
| 1805 | |
| 1806 | /** |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1807 | * drbd_md_ss() - Return the sector number of our meta data super block |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1808 | * @bdev: Meta data block device. |
| 1809 | */ |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1810 | static inline sector_t drbd_md_ss(struct drbd_backing_dev *bdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1811 | { |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1812 | const int meta_dev_idx = bdev->md.meta_dev_idx; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1813 | |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1814 | if (meta_dev_idx == DRBD_MD_INDEX_FLEX_EXT) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1815 | return 0; |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1816 | |
| 1817 | /* Since drbd08, internal meta data is always "flexible". |
| 1818 | * position: last 4k aligned block of 4k size */ |
| 1819 | if (meta_dev_idx == DRBD_MD_INDEX_INTERNAL || |
| 1820 | meta_dev_idx == DRBD_MD_INDEX_FLEX_INT) |
| 1821 | return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) - 8; |
| 1822 | |
| 1823 | /* external, some index; this is the old fixed size layout */ |
| 1824 | return MD_128MB_SECT * bdev->md.meta_dev_idx; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1825 | } |
| 1826 | |
| 1827 | static inline void |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1828 | drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) |
| 1829 | { |
| 1830 | unsigned long flags; |
| 1831 | spin_lock_irqsave(&q->q_lock, flags); |
| 1832 | list_add_tail(&w->list, &q->q); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1833 | spin_unlock_irqrestore(&q->q_lock, flags); |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1834 | wake_up(&q->q_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1835 | } |
| 1836 | |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 1837 | static inline void |
Lars Ellenberg | 15e26f6a | 2014-04-28 11:43:21 +0200 | [diff] [blame] | 1838 | drbd_queue_work_if_unqueued(struct drbd_work_queue *q, struct drbd_work *w) |
| 1839 | { |
| 1840 | unsigned long flags; |
| 1841 | spin_lock_irqsave(&q->q_lock, flags); |
| 1842 | if (list_empty_careful(&w->list)) |
| 1843 | list_add_tail(&w->list, &q->q); |
| 1844 | spin_unlock_irqrestore(&q->q_lock, flags); |
| 1845 | wake_up(&q->q_wait); |
| 1846 | } |
| 1847 | |
| 1848 | static inline void |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 1849 | drbd_device_post_work(struct drbd_device *device, int work_bit) |
| 1850 | { |
| 1851 | if (!test_and_set_bit(work_bit, &device->flags)) { |
| 1852 | struct drbd_connection *connection = |
| 1853 | first_peer_device(device)->connection; |
| 1854 | struct drbd_work_queue *q = &connection->sender_work; |
| 1855 | if (!test_and_set_bit(DEVICE_WORK_PENDING, &connection->flags)) |
| 1856 | wake_up(&q->q_wait); |
| 1857 | } |
| 1858 | } |
| 1859 | |
Andreas Gruenbacher | b5043c5 | 2011-07-28 15:56:02 +0200 | [diff] [blame] | 1860 | extern void drbd_flush_workqueue(struct drbd_work_queue *work_queue); |
| 1861 | |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1862 | /* To get the ack_receiver out of the blocking network stack, |
| 1863 | * so it can change its sk_rcvtimeo from idle- to ping-timeout, |
| 1864 | * and send a ping, we need to send a signal. |
| 1865 | * Which signal we send is irrelevant. */ |
| 1866 | static inline void wake_ack_receiver(struct drbd_connection *connection) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1867 | { |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1868 | struct task_struct *task = connection->ack_receiver.task; |
| 1869 | if (task && get_t_state(&connection->ack_receiver) == RUNNING) |
Eric W. Biederman | fee1099 | 2019-02-05 17:25:02 -0600 | [diff] [blame] | 1870 | send_sig(SIGXCPU, task, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1871 | } |
| 1872 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1873 | static inline void request_ping(struct drbd_connection *connection) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1874 | { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1875 | set_bit(SEND_PING, &connection->flags); |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1876 | wake_ack_receiver(connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1877 | } |
| 1878 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1879 | extern void *conn_prepare_command(struct drbd_connection *, struct drbd_socket *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1880 | extern void *drbd_prepare_command(struct drbd_peer_device *, struct drbd_socket *); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1881 | extern int conn_send_command(struct drbd_connection *, struct drbd_socket *, |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 1882 | enum drbd_packet, unsigned int, void *, |
| 1883 | unsigned int); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1884 | extern int drbd_send_command(struct drbd_peer_device *, struct drbd_socket *, |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 1885 | enum drbd_packet, unsigned int, void *, |
| 1886 | unsigned int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1887 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1888 | extern int drbd_send_ping(struct drbd_connection *connection); |
| 1889 | extern int drbd_send_ping_ack(struct drbd_connection *connection); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1890 | extern int drbd_send_state_req(struct drbd_peer_device *, union drbd_state, union drbd_state); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1891 | extern int conn_send_state_req(struct drbd_connection *, union drbd_state, union drbd_state); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1892 | |
| 1893 | static inline void drbd_thread_stop(struct drbd_thread *thi) |
| 1894 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1895 | _drbd_thread_stop(thi, false, true); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1896 | } |
| 1897 | |
| 1898 | static inline void drbd_thread_stop_nowait(struct drbd_thread *thi) |
| 1899 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1900 | _drbd_thread_stop(thi, false, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1901 | } |
| 1902 | |
| 1903 | static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) |
| 1904 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1905 | _drbd_thread_stop(thi, true, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1906 | } |
| 1907 | |
| 1908 | /* counts how many answer packets packets we expect from our peer, |
| 1909 | * for either explicit application requests, |
| 1910 | * or implicit barrier packets as necessary. |
| 1911 | * increased: |
| 1912 | * w_send_barrier |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1913 | * _req_mod(req, QUEUE_FOR_NET_WRITE or QUEUE_FOR_NET_READ); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1914 | * it is much easier and equally valid to count what we queue for the |
| 1915 | * worker, even before it actually was queued or send. |
| 1916 | * (drbd_make_request_common; recovery path on read io-error) |
| 1917 | * decreased: |
| 1918 | * got_BarrierAck (respective tl_clear, tl_clear_barrier) |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1919 | * _req_mod(req, DATA_RECEIVED) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1920 | * [from receive_DataReply] |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1921 | * _req_mod(req, WRITE_ACKED_BY_PEER or RECV_ACKED_BY_PEER or NEG_ACKED) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1922 | * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)] |
| 1923 | * for some reason it is NOT decreased in got_NegAck, |
| 1924 | * but in the resulting cleanup code from report_params. |
| 1925 | * we should try to remember the reason for that... |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1926 | * _req_mod(req, SEND_FAILED or SEND_CANCELED) |
| 1927 | * _req_mod(req, CONNECTION_LOST_WHILE_PENDING) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1928 | * [from tl_clear_barrier] |
| 1929 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1930 | static inline void inc_ap_pending(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1931 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1932 | atomic_inc(&device->ap_pending_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1933 | } |
| 1934 | |
Andreas Gruenbacher | 33f7d31 | 2023-03-30 12:27:39 +0200 | [diff] [blame] | 1935 | #define dec_ap_pending(device) ((void)expect((device), __dec_ap_pending(device) >= 0)) |
| 1936 | static inline int __dec_ap_pending(struct drbd_device *device) |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1937 | { |
Andreas Gruenbacher | 33f7d31 | 2023-03-30 12:27:39 +0200 | [diff] [blame] | 1938 | int ap_pending_cnt = atomic_dec_return(&device->ap_pending_cnt); |
| 1939 | |
| 1940 | if (ap_pending_cnt == 0) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1941 | wake_up(&device->misc_wait); |
Andreas Gruenbacher | 33f7d31 | 2023-03-30 12:27:39 +0200 | [diff] [blame] | 1942 | return ap_pending_cnt; |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1943 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1944 | |
| 1945 | /* counts how many resync-related answers we still expect from the peer |
| 1946 | * increase decrease |
| 1947 | * C_SYNC_TARGET sends P_RS_DATA_REQUEST (and expects P_RS_DATA_REPLY) |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1948 | * C_SYNC_SOURCE sends P_RS_DATA_REPLY (and expects P_WRITE_ACK with ID_SYNCER) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1949 | * (or P_NEG_ACK with ID_SYNCER) |
| 1950 | */ |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1951 | static inline void inc_rs_pending(struct drbd_peer_device *peer_device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1952 | { |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1953 | atomic_inc(&peer_device->device->rs_pending_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1954 | } |
| 1955 | |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1956 | #define dec_rs_pending(peer_device) \ |
| 1957 | ((void)expect((peer_device), __dec_rs_pending(peer_device) >= 0)) |
| 1958 | static inline int __dec_rs_pending(struct drbd_peer_device *peer_device) |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1959 | { |
Christoph Böhmwalder | 0d11f3c | 2023-03-30 12:27:44 +0200 | [diff] [blame] | 1960 | return atomic_dec_return(&peer_device->device->rs_pending_cnt); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1961 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1962 | |
| 1963 | /* counts how many answers we still need to send to the peer. |
| 1964 | * increased on |
| 1965 | * receive_Data unless protocol A; |
| 1966 | * we need to send a P_RECV_ACK (proto B) |
| 1967 | * or P_WRITE_ACK (proto C) |
| 1968 | * receive_RSDataReply (recv_resync_read) we need to send a P_WRITE_ACK |
| 1969 | * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA |
| 1970 | * receive_Barrier_* we need to send a P_BARRIER_ACK |
| 1971 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1972 | static inline void inc_unacked(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1973 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1974 | atomic_inc(&device->unacked_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1975 | } |
| 1976 | |
Andreas Gruenbacher | 33f7d31 | 2023-03-30 12:27:39 +0200 | [diff] [blame] | 1977 | #define dec_unacked(device) ((void)expect(device, __dec_unacked(device) >= 0)) |
| 1978 | static inline int __dec_unacked(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1979 | { |
Andreas Gruenbacher | 33f7d31 | 2023-03-30 12:27:39 +0200 | [diff] [blame] | 1980 | return atomic_dec_return(&device->unacked_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1981 | } |
| 1982 | |
Andreas Gruenbacher | 33f7d31 | 2023-03-30 12:27:39 +0200 | [diff] [blame] | 1983 | #define sub_unacked(device, n) ((void)expect(device, __sub_unacked(device) >= 0)) |
| 1984 | static inline int __sub_unacked(struct drbd_device *device, int n) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1985 | { |
Andreas Gruenbacher | 33f7d31 | 2023-03-30 12:27:39 +0200 | [diff] [blame] | 1986 | return atomic_sub_return(n, &device->unacked_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1987 | } |
| 1988 | |
Lars Ellenberg | 5052fee | 2016-06-14 00:26:24 +0200 | [diff] [blame] | 1989 | static inline bool is_sync_target_state(enum drbd_conns connection_state) |
| 1990 | { |
| 1991 | return connection_state == C_SYNC_TARGET || |
| 1992 | connection_state == C_PAUSED_SYNC_T; |
| 1993 | } |
| 1994 | |
| 1995 | static inline bool is_sync_source_state(enum drbd_conns connection_state) |
| 1996 | { |
| 1997 | return connection_state == C_SYNC_SOURCE || |
| 1998 | connection_state == C_PAUSED_SYNC_S; |
| 1999 | } |
| 2000 | |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 2001 | static inline bool is_sync_state(enum drbd_conns connection_state) |
| 2002 | { |
Lars Ellenberg | 5052fee | 2016-06-14 00:26:24 +0200 | [diff] [blame] | 2003 | return is_sync_source_state(connection_state) || |
| 2004 | is_sync_target_state(connection_state); |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 2005 | } |
| 2006 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2007 | /** |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2008 | * get_ldev() - Increase the ref count on device->ldev. Returns 0 if there is no ldev |
Andreas Gruenbacher | d1b8085 | 2014-09-11 14:29:09 +0200 | [diff] [blame] | 2009 | * @_device: DRBD device. |
| 2010 | * @_min_state: Minimum device state required for success. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2011 | * |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2012 | * You have to call put_ldev() when finished working with device->ldev. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2013 | */ |
Andreas Gruenbacher | d1b8085 | 2014-09-11 14:29:09 +0200 | [diff] [blame] | 2014 | #define get_ldev_if_state(_device, _min_state) \ |
| 2015 | (_get_ldev_if_state((_device), (_min_state)) ? \ |
| 2016 | ({ __acquire(x); true; }) : false) |
| 2017 | #define get_ldev(_device) get_ldev_if_state(_device, D_INCONSISTENT) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2018 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2019 | static inline void put_ldev(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2020 | { |
Andreas Gruenbacher | 11f8b2b | 2014-09-11 14:29:05 +0200 | [diff] [blame] | 2021 | enum drbd_disk_state disk_state = device->state.disk; |
Lars Ellenberg | ba3c6fb | 2014-02-11 08:57:18 +0100 | [diff] [blame] | 2022 | /* We must check the state *before* the atomic_dec becomes visible, |
| 2023 | * or we have a theoretical race where someone hitting zero, |
| 2024 | * while state still D_FAILED, will then see D_DISKLESS in the |
| 2025 | * condition below and calling into destroy, where he must not, yet. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2026 | int i = atomic_dec_return(&device->local_cnt); |
Lars Ellenberg | 9a0d9d03 | 2011-05-02 11:51:31 +0200 | [diff] [blame] | 2027 | |
| 2028 | /* This may be called from some endio handler, |
| 2029 | * so we must not sleep here. */ |
| 2030 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2031 | __release(local); |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 2032 | D_ASSERT(device, i >= 0); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2033 | if (i == 0) { |
Andreas Gruenbacher | 11f8b2b | 2014-09-11 14:29:05 +0200 | [diff] [blame] | 2034 | if (disk_state == D_DISKLESS) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2035 | /* even internal references gone, safe to destroy */ |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 2036 | drbd_device_post_work(device, DESTROY_DISK); |
Andreas Gruenbacher | 11f8b2b | 2014-09-11 14:29:05 +0200 | [diff] [blame] | 2037 | if (disk_state == D_FAILED) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2038 | /* all application IO references gone. */ |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 2039 | if (!test_and_set_bit(GOING_DISKLESS, &device->flags)) |
| 2040 | drbd_device_post_work(device, GO_DISKLESS); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2041 | wake_up(&device->misc_wait); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2042 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2043 | } |
| 2044 | |
| 2045 | #ifndef __CHECKER__ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2046 | static inline int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2047 | { |
| 2048 | int io_allowed; |
| 2049 | |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2050 | /* never get a reference while D_DISKLESS */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2051 | if (device->state.disk == D_DISKLESS) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2052 | return 0; |
| 2053 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2054 | atomic_inc(&device->local_cnt); |
| 2055 | io_allowed = (device->state.disk >= mins); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2056 | if (!io_allowed) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2057 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2058 | return io_allowed; |
| 2059 | } |
| 2060 | #else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2061 | extern int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2062 | #endif |
| 2063 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2064 | /* this throttles on-the-fly application requests |
| 2065 | * according to max_buffers settings; |
| 2066 | * maybe re-implement using semaphores? */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2067 | static inline int drbd_get_max_buffers(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2068 | { |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 2069 | struct net_conf *nc; |
| 2070 | int mxb; |
| 2071 | |
| 2072 | rcu_read_lock(); |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 2073 | nc = rcu_dereference(first_peer_device(device)->connection->net_conf); |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 2074 | mxb = nc ? nc->max_buffers : 1000000; /* arbitrary limit on open requests */ |
| 2075 | rcu_read_unlock(); |
| 2076 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2077 | return mxb; |
| 2078 | } |
| 2079 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2080 | static inline int drbd_state_is_stable(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2081 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2082 | union drbd_dev_state s = device->state; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2083 | |
| 2084 | /* DO NOT add a default clause, we want the compiler to warn us |
| 2085 | * for any newly introduced state we may have forgotten to add here */ |
| 2086 | |
| 2087 | switch ((enum drbd_conns)s.conn) { |
| 2088 | /* new io only accepted when there is no connection, ... */ |
| 2089 | case C_STANDALONE: |
| 2090 | case C_WF_CONNECTION: |
| 2091 | /* ... or there is a well established connection. */ |
| 2092 | case C_CONNECTED: |
| 2093 | case C_SYNC_SOURCE: |
| 2094 | case C_SYNC_TARGET: |
| 2095 | case C_VERIFY_S: |
| 2096 | case C_VERIFY_T: |
| 2097 | case C_PAUSED_SYNC_S: |
| 2098 | case C_PAUSED_SYNC_T: |
Philipp Reisner | 6753171 | 2010-10-27 12:21:30 +0200 | [diff] [blame] | 2099 | case C_AHEAD: |
| 2100 | case C_BEHIND: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2101 | /* transitional states, IO allowed */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2102 | case C_DISCONNECTING: |
| 2103 | case C_UNCONNECTED: |
| 2104 | case C_TIMEOUT: |
| 2105 | case C_BROKEN_PIPE: |
| 2106 | case C_NETWORK_FAILURE: |
| 2107 | case C_PROTOCOL_ERROR: |
| 2108 | case C_TEAR_DOWN: |
| 2109 | case C_WF_REPORT_PARAMS: |
| 2110 | case C_STARTING_SYNC_S: |
| 2111 | case C_STARTING_SYNC_T: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2112 | break; |
| 2113 | |
| 2114 | /* Allow IO in BM exchange states with new protocols */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2115 | case C_WF_BITMAP_S: |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 2116 | if (first_peer_device(device)->connection->agreed_pro_version < 96) |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2117 | return 0; |
| 2118 | break; |
| 2119 | |
| 2120 | /* no new io accepted in these states */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2121 | case C_WF_BITMAP_T: |
| 2122 | case C_WF_SYNC_UUID: |
| 2123 | case C_MASK: |
| 2124 | /* not "stable" */ |
| 2125 | return 0; |
| 2126 | } |
| 2127 | |
| 2128 | switch ((enum drbd_disk_state)s.disk) { |
| 2129 | case D_DISKLESS: |
| 2130 | case D_INCONSISTENT: |
| 2131 | case D_OUTDATED: |
| 2132 | case D_CONSISTENT: |
| 2133 | case D_UP_TO_DATE: |
Philipp Reisner | 5ca1de0 | 2011-06-28 17:01:19 +0200 | [diff] [blame] | 2134 | case D_FAILED: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2135 | /* disk state is stable as well. */ |
| 2136 | break; |
| 2137 | |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 2138 | /* no new io accepted during transitional states */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2139 | case D_ATTACHING: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2140 | case D_NEGOTIATING: |
| 2141 | case D_UNKNOWN: |
| 2142 | case D_MASK: |
| 2143 | /* not "stable" */ |
| 2144 | return 0; |
| 2145 | } |
| 2146 | |
| 2147 | return 1; |
| 2148 | } |
| 2149 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2150 | static inline int drbd_suspended(struct drbd_device *device) |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2151 | { |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 2152 | struct drbd_resource *resource = device->resource; |
Philipp Reisner | 8e0af25 | 2011-03-28 16:18:39 +0200 | [diff] [blame] | 2153 | |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 2154 | return resource->susp || resource->susp_fen || resource->susp_nod; |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2155 | } |
| 2156 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2157 | static inline bool may_inc_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2158 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2159 | int mxb = drbd_get_max_buffers(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2160 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2161 | if (drbd_suspended(device)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2162 | return false; |
Philipp Reisner | 7dbb438 | 2013-02-28 10:30:19 +0100 | [diff] [blame] | 2163 | if (atomic_read(&device->suspend_cnt)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2164 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2165 | |
| 2166 | /* to avoid potential deadlock or bitmap corruption, |
| 2167 | * in various places, we only allow new application io |
| 2168 | * to start during "stable" states. */ |
| 2169 | |
| 2170 | /* no new io accepted when attaching or detaching the disk */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2171 | if (!drbd_state_is_stable(device)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2172 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2173 | |
| 2174 | /* since some older kernels don't have atomic_add_unless, |
| 2175 | * and we are within the spinlock anyways, we have this workaround. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2176 | if (atomic_read(&device->ap_bio_cnt) > mxb) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2177 | return false; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2178 | if (test_bit(BITMAP_IO, &device->flags)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2179 | return false; |
| 2180 | return true; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2181 | } |
| 2182 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2183 | static inline bool inc_ap_bio_cond(struct drbd_device *device) |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2184 | { |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2185 | bool rv = false; |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2186 | |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 2187 | spin_lock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2188 | rv = may_inc_ap_bio(device); |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2189 | if (rv) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2190 | atomic_inc(&device->ap_bio_cnt); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 2191 | spin_unlock_irq(&device->resource->req_lock); |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2192 | |
| 2193 | return rv; |
| 2194 | } |
| 2195 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2196 | static inline void inc_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2197 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2198 | /* we wait here |
| 2199 | * as long as the device is suspended |
| 2200 | * until the bitmap is no longer on the fly during connection |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 2201 | * handshake as long as we would exceed the max_buffer limit. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2202 | * |
| 2203 | * to avoid races with the reconnect code, |
| 2204 | * we need to atomic_inc within the spinlock. */ |
| 2205 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2206 | wait_event(device->misc_wait, inc_ap_bio_cond(device)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2207 | } |
| 2208 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2209 | static inline void dec_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2210 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2211 | int mxb = drbd_get_max_buffers(device); |
| 2212 | int ap_bio = atomic_dec_return(&device->ap_bio_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2213 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 2214 | D_ASSERT(device, ap_bio >= 0); |
Lars Ellenberg | 7ee1fb9 | 2012-06-19 10:27:58 +0200 | [diff] [blame] | 2215 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2216 | if (ap_bio == 0 && test_bit(BITMAP_IO, &device->flags)) { |
| 2217 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags)) |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 2218 | drbd_queue_work(&first_peer_device(device)-> |
| 2219 | connection->sender_work, |
| 2220 | &device->bm_io_work.w); |
Lars Ellenberg | 7ee1fb9 | 2012-06-19 10:27:58 +0200 | [diff] [blame] | 2221 | } |
| 2222 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2223 | /* this currently does wake_up for every dec_ap_bio! |
| 2224 | * maybe rather introduce some type of hysteresis? |
| 2225 | * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ |
| 2226 | if (ap_bio < mxb) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2227 | wake_up(&device->misc_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2228 | } |
| 2229 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2230 | static inline bool verify_can_do_stop_sector(struct drbd_device *device) |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 2231 | { |
Andreas Gruenbacher | a6b32bc3 | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 2232 | return first_peer_device(device)->connection->agreed_pro_version >= 97 && |
| 2233 | first_peer_device(device)->connection->agreed_pro_version != 100; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 2234 | } |
| 2235 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2236 | static inline int drbd_set_ed_uuid(struct drbd_device *device, u64 val) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2237 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2238 | int changed = device->ed_uuid != val; |
| 2239 | device->ed_uuid = val; |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 2240 | return changed; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2241 | } |
| 2242 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2243 | static inline int drbd_queue_order_type(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2244 | { |
| 2245 | /* sorry, we currently have no working implementation |
| 2246 | * of distributed TCQ stuff */ |
| 2247 | #ifndef QUEUE_ORDERED_NONE |
| 2248 | #define QUEUE_ORDERED_NONE 0 |
| 2249 | #endif |
| 2250 | return QUEUE_ORDERED_NONE; |
| 2251 | } |
| 2252 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 2253 | static inline struct drbd_connection *first_connection(struct drbd_resource *resource) |
| 2254 | { |
Lars Ellenberg | ec4a3407 | 2014-04-28 18:43:35 +0200 | [diff] [blame] | 2255 | return list_first_entry_or_null(&resource->connections, |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 2256 | struct drbd_connection, connections); |
| 2257 | } |
| 2258 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2259 | #endif |