Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | drbd_int.h |
| 3 | |
| 4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| 5 | |
| 6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
| 7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| 8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| 9 | |
| 10 | drbd is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
| 14 | |
| 15 | drbd is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with drbd; see the file COPYING. If not, write to |
| 22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | |
| 24 | */ |
| 25 | |
| 26 | #ifndef _DRBD_INT_H |
| 27 | #define _DRBD_INT_H |
| 28 | |
Herbert Xu | 9534d67 | 2016-01-24 21:19:21 +0800 | [diff] [blame] | 29 | #include <crypto/hash.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 30 | #include <linux/compiler.h> |
| 31 | #include <linux/types.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 32 | #include <linux/list.h> |
| 33 | #include <linux/sched.h> |
| 34 | #include <linux/bitops.h> |
| 35 | #include <linux/slab.h> |
Randy Dunlap | 132cc53 | 2009-10-07 19:26:00 +0200 | [diff] [blame] | 36 | #include <linux/ratelimit.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 37 | #include <linux/tcp.h> |
| 38 | #include <linux/mutex.h> |
| 39 | #include <linux/major.h> |
| 40 | #include <linux/blkdev.h> |
Tejun Heo | 66114ca | 2015-05-22 17:13:32 -0400 | [diff] [blame] | 41 | #include <linux/backing-dev.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 42 | #include <linux/genhd.h> |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 43 | #include <linux/idr.h> |
Luis de Bethencourt | 9d5059c | 2016-08-02 14:03:47 -0700 | [diff] [blame] | 44 | #include <linux/dynamic_debug.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 45 | #include <net/tcp.h> |
| 46 | #include <linux/lru_cache.h> |
Paul Gortmaker | 70c7160 | 2011-05-22 16:47:17 -0400 | [diff] [blame] | 47 | #include <linux/prefetch.h> |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 48 | #include <linux/drbd_genl_api.h> |
Philipp Reisner | b890733 | 2011-01-27 14:07:51 +0100 | [diff] [blame] | 49 | #include <linux/drbd.h> |
Andreas Gruenbacher | d9f6522 | 2011-09-01 13:18:31 +0200 | [diff] [blame] | 50 | #include "drbd_strings.h" |
Philipp Reisner | b890733 | 2011-01-27 14:07:51 +0100 | [diff] [blame] | 51 | #include "drbd_state.h" |
Andreas Gruenbacher | a3603a6 | 2011-05-30 11:47:37 +0200 | [diff] [blame] | 52 | #include "drbd_protocol.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 53 | |
| 54 | #ifdef __CHECKER__ |
| 55 | # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr"))) |
| 56 | # define __protected_read_by(x) __attribute__((require_context(x,1,999,"read"))) |
| 57 | # define __protected_write_by(x) __attribute__((require_context(x,1,999,"write"))) |
| 58 | # define __must_hold(x) __attribute__((context(x,1,1), require_context(x,1,999,"call"))) |
| 59 | #else |
| 60 | # define __protected_by(x) |
| 61 | # define __protected_read_by(x) |
| 62 | # define __protected_write_by(x) |
| 63 | # define __must_hold(x) |
| 64 | #endif |
| 65 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 66 | /* module parameter, defined in drbd_main.c */ |
| 67 | extern unsigned int minor_count; |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 68 | extern bool disable_sendpage; |
| 69 | extern bool allow_oos; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 70 | void tl_abort_disk_io(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 71 | |
| 72 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
| 73 | extern int enable_faults; |
| 74 | extern int fault_rate; |
| 75 | extern int fault_devs; |
| 76 | #endif |
| 77 | |
| 78 | extern char usermode_helper[]; |
| 79 | |
| 80 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 81 | /* This is used to stop/restart our threads. |
| 82 | * Cannot use SIGTERM nor SIGKILL, since these |
| 83 | * are sent out by init on runlevel changes |
| 84 | * I choose SIGHUP for now. |
| 85 | */ |
| 86 | #define DRBD_SIGKILL SIGHUP |
| 87 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 88 | #define ID_IN_SYNC (4711ULL) |
| 89 | #define ID_OUT_OF_SYNC (4712ULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 90 | #define ID_SYNCER (-1ULL) |
Andreas Gruenbacher | 579b57e | 2011-01-13 18:40:57 +0100 | [diff] [blame] | 91 | |
Philipp Reisner | 4a23f26 | 2011-01-11 17:42:17 +0100 | [diff] [blame] | 92 | #define UUID_NEW_BM_OFFSET ((u64)0x0001000000000000ULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 93 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 94 | struct drbd_device; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 95 | struct drbd_connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 96 | |
Andreas Gruenbacher | 3b52bef | 2011-07-06 10:57:39 +0200 | [diff] [blame] | 97 | #define __drbd_printk_device(level, device, fmt, args...) \ |
| 98 | dev_printk(level, disk_to_dev((device)->vdisk), fmt, ## args) |
| 99 | #define __drbd_printk_peer_device(level, peer_device, fmt, args...) \ |
| 100 | dev_printk(level, disk_to_dev((peer_device)->device->vdisk), fmt, ## args) |
| 101 | #define __drbd_printk_resource(level, resource, fmt, args...) \ |
| 102 | printk(level "drbd %s: " fmt, (resource)->name, ## args) |
| 103 | #define __drbd_printk_connection(level, connection, fmt, args...) \ |
| 104 | printk(level "drbd %s: " fmt, (connection)->resource->name, ## args) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 105 | |
Andreas Gruenbacher | 3b52bef | 2011-07-06 10:57:39 +0200 | [diff] [blame] | 106 | void drbd_printk_with_wrong_object_type(void); |
| 107 | |
| 108 | #define __drbd_printk_if_same_type(obj, type, func, level, fmt, args...) \ |
| 109 | (__builtin_types_compatible_p(typeof(obj), type) || \ |
| 110 | __builtin_types_compatible_p(typeof(obj), const type)), \ |
| 111 | func(level, (const type)(obj), fmt, ## args) |
| 112 | |
| 113 | #define drbd_printk(level, obj, fmt, args...) \ |
| 114 | __builtin_choose_expr( \ |
| 115 | __drbd_printk_if_same_type(obj, struct drbd_device *, \ |
| 116 | __drbd_printk_device, level, fmt, ## args), \ |
| 117 | __builtin_choose_expr( \ |
| 118 | __drbd_printk_if_same_type(obj, struct drbd_resource *, \ |
| 119 | __drbd_printk_resource, level, fmt, ## args), \ |
| 120 | __builtin_choose_expr( \ |
| 121 | __drbd_printk_if_same_type(obj, struct drbd_connection *, \ |
| 122 | __drbd_printk_connection, level, fmt, ## args), \ |
| 123 | __builtin_choose_expr( \ |
| 124 | __drbd_printk_if_same_type(obj, struct drbd_peer_device *, \ |
| 125 | __drbd_printk_peer_device, level, fmt, ## args), \ |
| 126 | drbd_printk_with_wrong_object_type())))) |
| 127 | |
| 128 | #define drbd_dbg(obj, fmt, args...) \ |
| 129 | drbd_printk(KERN_DEBUG, obj, fmt, ## args) |
| 130 | #define drbd_alert(obj, fmt, args...) \ |
| 131 | drbd_printk(KERN_ALERT, obj, fmt, ## args) |
| 132 | #define drbd_err(obj, fmt, args...) \ |
| 133 | drbd_printk(KERN_ERR, obj, fmt, ## args) |
| 134 | #define drbd_warn(obj, fmt, args...) \ |
| 135 | drbd_printk(KERN_WARNING, obj, fmt, ## args) |
| 136 | #define drbd_info(obj, fmt, args...) \ |
| 137 | drbd_printk(KERN_INFO, obj, fmt, ## args) |
| 138 | #define drbd_emerg(obj, fmt, args...) \ |
| 139 | drbd_printk(KERN_EMERG, obj, fmt, ## args) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 140 | |
| 141 | #define dynamic_drbd_dbg(device, fmt, args...) \ |
| 142 | dynamic_dev_dbg(disk_to_dev(device->vdisk), fmt, ## args) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 143 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 144 | #define D_ASSERT(device, exp) do { \ |
| 145 | if (!(exp)) \ |
| 146 | drbd_err(device, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__); \ |
| 147 | } while (0) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 148 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 149 | /** |
| 150 | * expect - Make an assertion |
| 151 | * |
| 152 | * Unlike the assert macro, this macro returns a boolean result. |
| 153 | */ |
| 154 | #define expect(exp) ({ \ |
| 155 | bool _bool = (exp); \ |
| 156 | if (!_bool) \ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 157 | drbd_err(device, "ASSERTION %s FAILED in %s\n", \ |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 158 | #exp, __func__); \ |
| 159 | _bool; \ |
| 160 | }) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 161 | |
| 162 | /* Defines to control fault insertion */ |
| 163 | enum { |
| 164 | DRBD_FAULT_MD_WR = 0, /* meta data write */ |
| 165 | DRBD_FAULT_MD_RD = 1, /* read */ |
| 166 | DRBD_FAULT_RS_WR = 2, /* resync */ |
| 167 | DRBD_FAULT_RS_RD = 3, |
| 168 | DRBD_FAULT_DT_WR = 4, /* data */ |
| 169 | DRBD_FAULT_DT_RD = 5, |
| 170 | DRBD_FAULT_DT_RA = 6, /* data read ahead */ |
| 171 | DRBD_FAULT_BM_ALLOC = 7, /* bitmap allocation */ |
| 172 | DRBD_FAULT_AL_EE = 8, /* alloc ee */ |
Philipp Reisner | 6b4388a | 2010-04-26 14:11:45 +0200 | [diff] [blame] | 173 | 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] | 174 | |
| 175 | DRBD_FAULT_MAX, |
| 176 | }; |
| 177 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 178 | extern unsigned int |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 179 | _drbd_insert_fault(struct drbd_device *device, unsigned int type); |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 180 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 181 | static inline int |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 182 | drbd_insert_fault(struct drbd_device *device, unsigned int type) { |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 183 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 184 | return fault_rate && |
| 185 | (enable_faults & (1<<type)) && |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 186 | _drbd_insert_fault(device, type); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 187 | #else |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 188 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 189 | #endif |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 190 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 191 | |
| 192 | /* integer division, round _UP_ to the next integer */ |
| 193 | #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0)) |
| 194 | /* usual integer division */ |
| 195 | #define div_floor(A, B) ((A)/(B)) |
| 196 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 197 | extern struct ratelimit_state drbd_ratelimit_state; |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 198 | extern struct idr drbd_devices; /* RCU, updates: genl_lock() */ |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 199 | extern struct list_head drbd_resources; /* RCU, updates: genl_lock() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 200 | |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 201 | extern const char *cmdname(enum drbd_packet cmd); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 202 | |
| 203 | /* for sending/receiving the bitmap, |
| 204 | * possibly in some encoding scheme */ |
| 205 | struct bm_xfer_ctx { |
| 206 | /* "const" |
| 207 | * stores total bits and long words |
| 208 | * of the bitmap, so we don't need to |
| 209 | * call the accessor functions over and again. */ |
| 210 | unsigned long bm_bits; |
| 211 | unsigned long bm_words; |
| 212 | /* during xfer, current position within the bitmap */ |
| 213 | unsigned long bit_offset; |
| 214 | unsigned long word_offset; |
| 215 | |
| 216 | /* statistics; index: (h->command == P_BITMAP) */ |
| 217 | unsigned packets[2]; |
| 218 | unsigned bytes[2]; |
| 219 | }; |
| 220 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 221 | extern void INFO_bm_xfer_stats(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 222 | const char *direction, struct bm_xfer_ctx *c); |
| 223 | |
| 224 | static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) |
| 225 | { |
| 226 | /* word_offset counts "native long words" (32 or 64 bit), |
| 227 | * aligned at 64 bit. |
| 228 | * Encoded packet may end at an unaligned bit offset. |
| 229 | * In case a fallback clear text packet is transmitted in |
| 230 | * between, we adjust this offset back to the last 64bit |
| 231 | * aligned "native long word", which makes coding and decoding |
| 232 | * the plain text bitmap much more convenient. */ |
| 233 | #if BITS_PER_LONG == 64 |
| 234 | c->word_offset = c->bit_offset >> 6; |
| 235 | #elif BITS_PER_LONG == 32 |
| 236 | c->word_offset = c->bit_offset >> 5; |
| 237 | c->word_offset &= ~(1UL); |
| 238 | #else |
| 239 | # error "unsupported BITS_PER_LONG" |
| 240 | #endif |
| 241 | } |
| 242 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 243 | extern unsigned int drbd_header_size(struct drbd_connection *connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 244 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 245 | /**********************************************************************/ |
| 246 | enum drbd_thread_state { |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 247 | NONE, |
| 248 | RUNNING, |
| 249 | EXITING, |
| 250 | RESTARTING |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 251 | }; |
| 252 | |
| 253 | struct drbd_thread { |
| 254 | spinlock_t t_lock; |
| 255 | struct task_struct *task; |
| 256 | struct completion stop; |
| 257 | enum drbd_thread_state t_state; |
| 258 | int (*function) (struct drbd_thread *); |
Andreas Gruenbacher | 2457b6d | 2011-07-21 13:45:21 +0200 | [diff] [blame] | 259 | struct drbd_resource *resource; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 260 | struct drbd_connection *connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 261 | int reset_cpu_mask; |
Andreas Gruenbacher | c60b025 | 2011-08-10 15:05:02 +0200 | [diff] [blame] | 262 | const char *name; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 263 | }; |
| 264 | |
| 265 | static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) |
| 266 | { |
| 267 | /* THINK testing the t_state seems to be uncritical in all cases |
| 268 | * (but thread_{start,stop}), so we can read it *without* the lock. |
| 269 | * --lge */ |
| 270 | |
| 271 | smp_rmb(); |
| 272 | return thi->t_state; |
| 273 | } |
| 274 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 275 | struct drbd_work { |
| 276 | struct list_head list; |
Andreas Gruenbacher | 309a834 | 2010-12-21 12:38:39 +0100 | [diff] [blame] | 277 | int (*cb)(struct drbd_work *, int cancel); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 278 | }; |
| 279 | |
| 280 | struct drbd_device_work { |
| 281 | struct drbd_work w; |
| 282 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 283 | }; |
| 284 | |
Andreas Gruenbacher | ace652a | 2011-01-03 17:09:58 +0100 | [diff] [blame] | 285 | #include "drbd_interval.h" |
| 286 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 287 | extern int drbd_wait_misc(struct drbd_device *, struct drbd_interval *); |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 288 | |
Andreas Gruenbacher | 28bc3b8 | 2014-08-14 18:33:30 +0200 | [diff] [blame] | 289 | extern void lock_all_resources(void); |
| 290 | extern void unlock_all_resources(void); |
| 291 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 292 | struct drbd_request { |
| 293 | struct drbd_work w; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 294 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 295 | |
| 296 | /* if local IO is not allowed, will be NULL. |
| 297 | * if local IO _is_ allowed, holds the locally submitted bio clone, |
| 298 | * or, after local IO completion, the ERR_PTR(error). |
Andreas Gruenbacher | fcefa62 | 2011-02-17 16:46:59 +0100 | [diff] [blame] | 299 | * see drbd_request_endio(). */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 300 | struct bio *private_bio; |
| 301 | |
Andreas Gruenbacher | ace652a | 2011-01-03 17:09:58 +0100 | [diff] [blame] | 302 | struct drbd_interval i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 303 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 304 | /* epoch: used to check on "completion" whether this req was in |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 305 | * the current epoch, and we therefore have to close it, |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 306 | * causing a p_barrier packet to be send, starting a new epoch. |
| 307 | * |
| 308 | * This corresponds to "barrier" in struct p_barrier[_ack], |
| 309 | * and to "barrier_nr" in struct drbd_epoch (and various |
| 310 | * comments/function parameters/local variable names). |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 311 | */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 312 | unsigned int epoch; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 313 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 314 | struct list_head tl_requests; /* ring list in the transfer log */ |
| 315 | struct bio *master_bio; /* master bio pointer */ |
Lars Ellenberg | e5f891b | 2013-11-22 12:32:01 +0100 | [diff] [blame] | 316 | |
Lars Ellenberg | 844a6ae | 2013-11-22 12:52:03 +0100 | [diff] [blame] | 317 | /* see struct drbd_device */ |
| 318 | struct list_head req_pending_master_completion; |
| 319 | struct list_head req_pending_local; |
| 320 | |
Lars Ellenberg | e5f891b | 2013-11-22 12:32:01 +0100 | [diff] [blame] | 321 | /* for generic IO accounting */ |
| 322 | unsigned long start_jif; |
| 323 | |
| 324 | /* for DRBD internal statistics */ |
| 325 | |
| 326 | /* Minimal set of time stamps to determine if we wait for activity log |
| 327 | * transactions, local disk or peer. 32 bit "jiffies" are good enough, |
| 328 | * we don't expect a DRBD request to be stalled for several month. |
| 329 | */ |
| 330 | |
| 331 | /* before actual request processing */ |
| 332 | unsigned long in_actlog_jif; |
| 333 | |
| 334 | /* local disk */ |
| 335 | unsigned long pre_submit_jif; |
| 336 | |
| 337 | /* per connection */ |
| 338 | unsigned long pre_send_jif; |
| 339 | unsigned long acked_jif; |
| 340 | unsigned long net_done_jif; |
| 341 | |
| 342 | /* Possibly even more detail to track each phase: |
| 343 | * master_completion_jif |
| 344 | * how long did it take to complete the master bio |
| 345 | * (application visible latency) |
| 346 | * allocated_jif |
| 347 | * how long the master bio was blocked until we finally allocated |
| 348 | * a tracking struct |
| 349 | * in_actlog_jif |
| 350 | * how long did we wait for activity log transactions |
| 351 | * |
| 352 | * net_queued_jif |
| 353 | * when did we finally queue it for sending |
| 354 | * pre_send_jif |
| 355 | * when did we start sending it |
| 356 | * post_send_jif |
| 357 | * how long did we block in the network stack trying to send it |
| 358 | * acked_jif |
| 359 | * when did we receive (or fake, in protocol A) a remote ACK |
| 360 | * net_done_jif |
| 361 | * when did we receive final acknowledgement (P_BARRIER_ACK), |
| 362 | * or decide, e.g. on connection loss, that we do no longer expect |
| 363 | * anything from this peer for this request. |
| 364 | * |
| 365 | * pre_submit_jif |
| 366 | * post_sub_jif |
| 367 | * when did we start submiting to the lower level device, |
| 368 | * and how long did we block in that submit function |
| 369 | * local_completion_jif |
| 370 | * how long did it take the lower level device to complete this request |
| 371 | */ |
| 372 | |
Lars Ellenberg | b406777 | 2012-01-24 16:58:11 +0100 | [diff] [blame] | 373 | |
| 374 | /* once it hits 0, we may complete the master_bio */ |
| 375 | atomic_t completion_ref; |
| 376 | /* once it hits 0, we may destroy this drbd_request object */ |
| 377 | struct kref kref; |
Lars Ellenberg | a0d856d | 2012-01-24 17:19:42 +0100 | [diff] [blame] | 378 | |
| 379 | unsigned rq_state; /* see comments above _req_mod() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 380 | }; |
| 381 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 382 | struct drbd_epoch { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 383 | struct drbd_connection *connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 384 | struct list_head list; |
| 385 | unsigned int barrier_nr; |
| 386 | atomic_t epoch_size; /* increased on every request added. */ |
| 387 | atomic_t active; /* increased on every req. added, and dec on every finished. */ |
| 388 | unsigned long flags; |
| 389 | }; |
| 390 | |
Rashika Kheria | de0b2e6 | 2013-12-19 15:07:47 +0530 | [diff] [blame] | 391 | /* Prototype declaration of function defined in drbd_receiver.c */ |
| 392 | int drbdd_init(struct drbd_thread *); |
| 393 | int drbd_asender(struct drbd_thread *); |
| 394 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 395 | /* drbd_epoch flag bits */ |
| 396 | enum { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 397 | DE_HAVE_BARRIER_NUMBER, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 398 | }; |
| 399 | |
| 400 | enum epoch_event { |
| 401 | EV_PUT, |
| 402 | EV_GOT_BARRIER_NR, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 403 | EV_BECAME_LAST, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 404 | EV_CLEANUP = 32, /* used as flag */ |
| 405 | }; |
| 406 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 407 | struct digest_info { |
| 408 | int digest_size; |
| 409 | void *digest; |
| 410 | }; |
| 411 | |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 412 | struct drbd_peer_request { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 413 | struct drbd_work w; |
| 414 | struct drbd_peer_device *peer_device; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 415 | struct drbd_epoch *epoch; /* for writes */ |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 416 | struct page *pages; |
| 417 | atomic_t pending_bios; |
Andreas Gruenbacher | 010f6e6 | 2011-01-14 20:59:35 +0100 | [diff] [blame] | 418 | struct drbd_interval i; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 419 | /* see comments on ee flag bits below */ |
| 420 | unsigned long flags; |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 421 | unsigned long submit_jif; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 422 | union { |
| 423 | u64 block_id; |
| 424 | struct digest_info *digest; |
| 425 | }; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 426 | }; |
| 427 | |
| 428 | /* ee flag bits. |
| 429 | * While corresponding bios are in flight, the only modification will be |
| 430 | * set_bit WAS_ERROR, which has to be atomic. |
| 431 | * If no bios are in flight yet, or all have been completed, |
| 432 | * non-atomic modification to ee->flags is ok. |
| 433 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 434 | enum { |
| 435 | __EE_CALL_AL_COMPLETE_IO, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 436 | __EE_MAY_SET_IN_SYNC, |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 437 | |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 438 | /* is this a TRIM aka REQ_DISCARD? */ |
| 439 | __EE_IS_TRIM, |
| 440 | /* our lower level cannot handle trim, |
| 441 | * and we want to fall back to zeroout instead */ |
| 442 | __EE_IS_TRIM_USE_ZEROOUT, |
| 443 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 444 | /* In case a barrier failed, |
| 445 | * we need to resubmit without the barrier flag. */ |
| 446 | __EE_RESUBMITTED, |
| 447 | |
Andreas Gruenbacher | 6c852be | 2011-02-04 15:38:52 +0100 | [diff] [blame] | 448 | /* we may have several bios per peer request. |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 449 | * if any of those fail, we set this flag atomically |
| 450 | * from the endio callback */ |
| 451 | __EE_WAS_ERROR, |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 452 | |
| 453 | /* This ee has a pointer to a digest instead of a block id */ |
| 454 | __EE_HAS_DIGEST, |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 455 | |
| 456 | /* Conflicting local requests need to be restarted after this request */ |
| 457 | __EE_RESTART_REQUESTS, |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 458 | |
| 459 | /* The peer wants a write ACK for this (wire proto C) */ |
| 460 | __EE_SEND_WRITE_ACK, |
Philipp Reisner | 302bdea | 2011-04-21 11:36:49 +0200 | [diff] [blame] | 461 | |
| 462 | /* Is set when net_conf had two_primaries set while creating this peer_req */ |
| 463 | __EE_IN_INTERVAL_TREE, |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 464 | |
| 465 | /* for debugfs: */ |
| 466 | /* has this been submitted, or does it still wait for something else? */ |
| 467 | __EE_SUBMITTED, |
| 468 | |
| 469 | /* this is/was a write request */ |
| 470 | __EE_WRITE, |
| 471 | |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 472 | /* this is/was a write same request */ |
| 473 | __EE_WRITE_SAME, |
| 474 | |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 475 | /* this originates from application on peer |
| 476 | * (not some resync or verify or other DRBD internal request) */ |
| 477 | __EE_APPLICATION, |
Philipp Reisner | 700ca8c | 2016-06-14 00:26:13 +0200 | [diff] [blame] | 478 | |
| 479 | /* If it contains only 0 bytes, send back P_RS_DEALLOCATED */ |
| 480 | __EE_RS_THIN_REQ, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 481 | }; |
| 482 | #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 483 | #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC) |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 484 | #define EE_IS_TRIM (1<<__EE_IS_TRIM) |
| 485 | #define EE_IS_TRIM_USE_ZEROOUT (1<<__EE_IS_TRIM_USE_ZEROOUT) |
| 486 | #define EE_RESUBMITTED (1<<__EE_RESUBMITTED) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 487 | #define EE_WAS_ERROR (1<<__EE_WAS_ERROR) |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 488 | #define EE_HAS_DIGEST (1<<__EE_HAS_DIGEST) |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 489 | #define EE_RESTART_REQUESTS (1<<__EE_RESTART_REQUESTS) |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 490 | #define EE_SEND_WRITE_ACK (1<<__EE_SEND_WRITE_ACK) |
Philipp Reisner | 302bdea | 2011-04-21 11:36:49 +0200 | [diff] [blame] | 491 | #define EE_IN_INTERVAL_TREE (1<<__EE_IN_INTERVAL_TREE) |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 492 | #define EE_SUBMITTED (1<<__EE_SUBMITTED) |
| 493 | #define EE_WRITE (1<<__EE_WRITE) |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 494 | #define EE_WRITE_SAME (1<<__EE_WRITE_SAME) |
Lars Ellenberg | 21ae5d7 | 2014-05-05 23:42:24 +0200 | [diff] [blame] | 495 | #define EE_APPLICATION (1<<__EE_APPLICATION) |
Philipp Reisner | 700ca8c | 2016-06-14 00:26:13 +0200 | [diff] [blame] | 496 | #define EE_RS_THIN_REQ (1<<__EE_RS_THIN_REQ) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 497 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 498 | /* flag bits per device */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 499 | enum { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 500 | UNPLUG_REMOTE, /* sending a "UnplugRemote" could help */ |
| 501 | MD_DIRTY, /* current uuids and flags not yet on disk */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 502 | USE_DEGR_WFC_T, /* degr-wfc-timeout instead of wfc-timeout. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 503 | CL_ST_CHG_SUCCESS, |
| 504 | CL_ST_CHG_FAIL, |
| 505 | CRASHED_PRIMARY, /* This node was a crashed primary. |
| 506 | * Gets cleared when the state.conn |
| 507 | * goes into C_CONNECTED state. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 508 | CONSIDER_RESYNC, |
| 509 | |
Philipp Reisner | a8a4e51 | 2010-08-25 10:21:04 +0200 | [diff] [blame] | 510 | 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] | 511 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 512 | BITMAP_IO, /* suspend application io; |
| 513 | once no more io in flight, start bitmap io */ |
| 514 | BITMAP_IO_QUEUED, /* Started bitmap IO */ |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 515 | WAS_IO_ERROR, /* Local disk failed, returned IO error */ |
| 516 | WAS_READ_ERROR, /* Local disk READ failed (set additionally to the above) */ |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 517 | FORCE_DETACH, /* Force-detach from local disk, aborting any pending local IO */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 518 | RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 519 | RESIZE_PENDING, /* Size change detected locally, waiting for the response from |
| 520 | * the peer, if it changed there as well. */ |
Philipp Reisner | 43a5182 | 2010-06-11 11:26:34 +0200 | [diff] [blame] | 521 | NEW_CUR_UUID, /* Create new current UUID when thawing IO */ |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 522 | AL_SUSPENDED, /* Activity logging is currently suspended. */ |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 523 | AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */ |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 524 | B_RS_H_DONE, /* Before resync handler done (already executed) */ |
Philipp Reisner | 08b165b | 2011-09-05 16:22:33 +0200 | [diff] [blame] | 525 | DISCARD_MY_DATA, /* discard_my_data flag per volume */ |
Philipp Reisner | 380207d | 2011-11-11 12:31:20 +0100 | [diff] [blame] | 526 | READ_BALANCE_RR, |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 527 | |
Lars Ellenberg | f418815 | 2014-05-05 23:05:47 +0200 | [diff] [blame] | 528 | FLUSH_PENDING, /* if set, device->flush_jif is when we submitted that flush |
| 529 | * from drbd_flush_after_epoch() */ |
| 530 | |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 531 | /* cleared only after backing device related structures have been destroyed. */ |
| 532 | GOING_DISKLESS, /* Disk is being detached, because of io-error, or admin request. */ |
| 533 | |
| 534 | /* to be used in drbd_device_post_work() */ |
| 535 | GO_DISKLESS, /* tell worker to schedule cleanup before detach */ |
| 536 | DESTROY_DISK, /* tell worker to close backing devices and destroy related structures. */ |
Lars Ellenberg | ac0acb9 | 2014-02-11 09:47:58 +0100 | [diff] [blame] | 537 | MD_SYNC, /* tell worker to call drbd_md_sync() */ |
| 538 | RS_START, /* tell worker to start resync/OV */ |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 539 | RS_PROGRESS, /* tell worker that resync made significant progress */ |
| 540 | RS_DONE, /* tell worker that resync is done */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 541 | }; |
| 542 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 543 | struct drbd_bitmap; /* opaque for drbd_device */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 544 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 545 | /* definition of bits in bm_flags to be used in drbd_bm_lock |
| 546 | * and drbd_bitmap_io and friends. */ |
| 547 | enum bm_flag { |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 548 | /* currently locked for bulk operation */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 549 | BM_LOCKED_MASK = 0xf, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 550 | |
| 551 | /* in detail, that is: */ |
| 552 | BM_DONT_CLEAR = 0x1, |
| 553 | BM_DONT_SET = 0x2, |
| 554 | BM_DONT_TEST = 0x4, |
| 555 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 556 | /* so we can mark it locked for bulk operation, |
| 557 | * and still allow all non-bulk operations */ |
| 558 | BM_IS_LOCKED = 0x8, |
| 559 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 560 | /* (test bit, count bit) allowed (common case) */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 561 | BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 562 | |
| 563 | /* testing bits, as well as setting new bits allowed, but clearing bits |
| 564 | * would be unexpected. Used during bitmap receive. Setting new bits |
| 565 | * requires sending of "out-of-sync" information, though. */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 566 | BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 567 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 568 | /* for drbd_bm_write_copy_pages, everything is allowed, |
| 569 | * only concurrent bulk operations are locked out. */ |
| 570 | BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 571 | }; |
| 572 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 573 | struct drbd_work_queue { |
| 574 | struct list_head q; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 575 | spinlock_t q_lock; /* to protect the list. */ |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 576 | wait_queue_head_t q_wait; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 577 | }; |
| 578 | |
| 579 | struct drbd_socket { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 580 | struct mutex mutex; |
| 581 | struct socket *socket; |
| 582 | /* this way we get our |
| 583 | * send/receive buffers off the stack */ |
Andreas Gruenbacher | 5a87d92 | 2011-03-24 21:17:52 +0100 | [diff] [blame] | 584 | void *sbuf; |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 585 | void *rbuf; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 586 | }; |
| 587 | |
| 588 | struct drbd_md { |
| 589 | u64 md_offset; /* sector offset to 'super' block */ |
| 590 | |
| 591 | u64 la_size_sect; /* last agreed size, unit sectors */ |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 592 | spinlock_t uuid_lock; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 593 | u64 uuid[UI_SIZE]; |
| 594 | u64 device_uuid; |
| 595 | u32 flags; |
| 596 | u32 md_size_sect; |
| 597 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 598 | s32 al_offset; /* signed relative sector offset to activity log */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 599 | s32 bm_offset; /* signed relative sector offset to bitmap */ |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 600 | |
| 601 | /* cached value of bdev->disk_conf->meta_dev_idx (see below) */ |
| 602 | s32 meta_dev_idx; |
| 603 | |
| 604 | /* see al_tr_number_to_on_disk_sector() */ |
| 605 | u32 al_stripes; |
| 606 | u32 al_stripe_size_4k; |
| 607 | u32 al_size_4k; /* cached product of the above */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 608 | }; |
| 609 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 610 | struct drbd_backing_dev { |
| 611 | struct block_device *backing_bdev; |
| 612 | struct block_device *md_bdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 613 | struct drbd_md md; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 614 | struct disk_conf *disk_conf; /* RCU, for updates: resource->conf_update */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 615 | sector_t known_size; /* last known size of that backing device */ |
| 616 | }; |
| 617 | |
| 618 | struct drbd_md_io { |
Lars Ellenberg | e37d243 | 2014-04-01 23:53:30 +0200 | [diff] [blame] | 619 | struct page *page; |
| 620 | unsigned long start_jif; /* last call to drbd_md_get_buffer */ |
| 621 | unsigned long submit_jif; /* last _drbd_md_sync_page_io() submit */ |
| 622 | const char *current_use; |
| 623 | atomic_t in_use; |
Philipp Reisner | 0c46442 | 2011-06-26 22:26:31 +0200 | [diff] [blame] | 624 | unsigned int done; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 625 | int error; |
| 626 | }; |
| 627 | |
| 628 | struct bm_io_work { |
| 629 | struct drbd_work w; |
| 630 | char *why; |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 631 | enum bm_flag flags; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 632 | int (*io_fn)(struct drbd_device *device); |
| 633 | void (*done)(struct drbd_device *device, int rv); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 634 | }; |
| 635 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 636 | struct fifo_buffer { |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 637 | unsigned int head_index; |
| 638 | unsigned int size; |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 639 | int total; /* sum of all values */ |
| 640 | int values[0]; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 641 | }; |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 642 | extern struct fifo_buffer *fifo_alloc(int fifo_size); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 643 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 644 | /* flag bits per connection */ |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 645 | enum { |
| 646 | NET_CONGESTED, /* The data socket is congested */ |
Lars Ellenberg | 427c043 | 2012-08-01 12:43:01 +0200 | [diff] [blame] | 647 | RESOLVE_CONFLICTS, /* Set on one node, cleared on the peer! */ |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 648 | SEND_PING, |
Philipp Reisner | 2a67d8b | 2011-02-09 14:10:32 +0100 | [diff] [blame] | 649 | 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] | 650 | 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] | 651 | CONN_WD_ST_CHG_OKAY, |
| 652 | CONN_WD_ST_CHG_FAIL, |
Philipp Reisner | 8169e41 | 2011-03-15 18:40:27 +0100 | [diff] [blame] | 653 | CONN_DRY_RUN, /* Expect disconnect after resync handshake. */ |
Philipp Reisner | 6936fcb | 2011-11-10 18:45:36 +0100 | [diff] [blame] | 654 | CREATE_BARRIER, /* next P_DATA is preceded by a P_BARRIER */ |
Philipp Reisner | a1096a6 | 2012-04-06 12:07:34 +0200 | [diff] [blame] | 655 | STATE_SENT, /* Do not change state/UUIDs while this is set */ |
Lars Ellenberg | 6f3465e | 2012-07-30 09:08:25 +0200 | [diff] [blame] | 656 | CALLBACK_PENDING, /* Whether we have a call_usermodehelper(, UMH_WAIT_PROC) |
| 657 | * pending, from drbd worker context. |
| 658 | * If set, bdi_write_congested() returns true, |
| 659 | * so shrink_page_list() would not recurse into, |
| 660 | * and potentially deadlock on, this drbd worker. |
| 661 | */ |
Philipp Reisner | b66623e | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 662 | DISCONNECT_SENT, |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 663 | |
| 664 | DEVICE_WORK_PENDING, /* tell worker that some device has pending work */ |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 665 | }; |
| 666 | |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 667 | enum which_state { NOW, OLD = NOW, NEW }; |
| 668 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 669 | struct drbd_resource { |
| 670 | char *name; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 671 | #ifdef CONFIG_DEBUG_FS |
| 672 | struct dentry *debugfs_res; |
| 673 | struct dentry *debugfs_res_volumes; |
| 674 | struct dentry *debugfs_res_connections; |
| 675 | struct dentry *debugfs_res_in_flight_summary; |
| 676 | #endif |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 677 | struct kref kref; |
Andreas Gruenbacher | 803ea13 | 2011-06-09 01:40:48 +0200 | [diff] [blame] | 678 | struct idr devices; /* volume number to device mapping */ |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 679 | struct list_head connections; |
| 680 | struct list_head resources; |
Andreas Gruenbacher | eb6bea6 | 2011-06-21 16:11:28 +0200 | [diff] [blame] | 681 | struct res_opts res_opts; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 682 | 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] | 683 | struct mutex adm_mutex; /* mutex to serialize administrative requests */ |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 684 | spinlock_t req_lock; |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 685 | |
| 686 | unsigned susp:1; /* IO suspended by user */ |
| 687 | unsigned susp_nod:1; /* IO suspended because no data */ |
| 688 | unsigned susp_fen:1; /* IO suspended because fence peer handler runs */ |
Andreas Gruenbacher | 625a6ba | 2011-07-22 14:29:02 +0200 | [diff] [blame] | 689 | |
Philipp Reisner | e952658 | 2013-11-22 15:53:41 +0100 | [diff] [blame] | 690 | enum write_ordering_e write_ordering; |
| 691 | |
Andreas Gruenbacher | 625a6ba | 2011-07-22 14:29:02 +0200 | [diff] [blame] | 692 | cpumask_var_t cpu_mask; |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 693 | }; |
| 694 | |
Lars Ellenberg | 944410e | 2014-05-06 15:02:05 +0200 | [diff] [blame] | 695 | struct drbd_thread_timing_details |
| 696 | { |
| 697 | unsigned long start_jif; |
| 698 | void *cb_addr; |
| 699 | const char *caller_fn; |
| 700 | unsigned int line; |
| 701 | unsigned int cb_nr; |
| 702 | }; |
| 703 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 704 | struct drbd_connection { |
| 705 | struct list_head connections; |
| 706 | struct drbd_resource *resource; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 707 | #ifdef CONFIG_DEBUG_FS |
| 708 | struct dentry *debugfs_conn; |
| 709 | struct dentry *debugfs_conn_callback_history; |
| 710 | struct dentry *debugfs_conn_oldest_requests; |
| 711 | #endif |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 712 | struct kref kref; |
Andreas Gruenbacher | c06ece6 | 2011-06-21 17:23:59 +0200 | [diff] [blame] | 713 | struct idr peer_devices; /* volume number to peer device mapping */ |
Philipp Reisner | 8410da8 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 714 | enum drbd_conns cstate; /* Only C_STANDALONE to C_WF_REPORT_PARAMS */ |
| 715 | struct mutex cstate_mutex; /* Protects graceful disconnects */ |
Philipp Reisner | 28e448b | 2013-06-25 16:50:06 +0200 | [diff] [blame] | 716 | unsigned int connect_cnt; /* Inc each time a connection is established */ |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 717 | |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 718 | unsigned long flags; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 719 | struct net_conf *net_conf; /* content protected by rcu */ |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 720 | 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] | 721 | |
Andreas Gruenbacher | 089c075 | 2011-06-14 18:28:09 +0200 | [diff] [blame] | 722 | struct sockaddr_storage my_addr; |
| 723 | int my_addr_len; |
| 724 | struct sockaddr_storage peer_addr; |
| 725 | int peer_addr_len; |
| 726 | |
Philipp Reisner | e42325a | 2011-01-19 13:55:45 +0100 | [diff] [blame] | 727 | struct drbd_socket data; /* data/barrier/cstate/parameter packets */ |
| 728 | struct drbd_socket meta; /* ping/ack (metadata) packets */ |
Philipp Reisner | 31890f4 | 2011-01-19 14:12:51 +0100 | [diff] [blame] | 729 | int agreed_pro_version; /* actually used protocol version */ |
Lars Ellenberg | 20c68fd | 2014-04-28 18:43:25 +0200 | [diff] [blame] | 730 | u32 agreed_features; |
Philipp Reisner | 31890f4 | 2011-01-19 14:12:51 +0100 | [diff] [blame] | 731 | unsigned long last_received; /* in jiffies, either socket */ |
| 732 | unsigned int ko_count; |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 733 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 734 | struct list_head transfer_log; /* all requests not yet fully processed */ |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 735 | |
Herbert Xu | 9534d67 | 2016-01-24 21:19:21 +0800 | [diff] [blame] | 736 | struct crypto_shash *cram_hmac_tfm; |
| 737 | struct crypto_ahash *integrity_tfm; /* checksums we compute, updates protected by connection->data->mutex */ |
| 738 | struct crypto_ahash *peer_integrity_tfm; /* checksums we verify, only accessed from receiver thread */ |
| 739 | struct crypto_ahash *csums_tfm; |
| 740 | struct crypto_ahash *verify_tfm; |
Philipp Reisner | a063845 | 2011-01-19 14:31:32 +0100 | [diff] [blame] | 741 | void *int_dig_in; |
| 742 | void *int_dig_vv; |
| 743 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 744 | /* receiver side */ |
Philipp Reisner | 12038a3 | 2011-11-09 19:18:00 +0100 | [diff] [blame] | 745 | struct drbd_epoch *current_epoch; |
| 746 | spinlock_t epoch_lock; |
| 747 | unsigned int epochs; |
Lars Ellenberg | b379c41 | 2011-11-17 11:49:46 +0100 | [diff] [blame] | 748 | atomic_t current_tle_nr; /* transfer log epoch number */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 749 | unsigned current_tle_writes; /* writes seen within this tl epoch */ |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 750 | |
Lars Ellenberg | 07be15b | 2012-05-07 11:53:08 +0200 | [diff] [blame] | 751 | unsigned long last_reconnect_jif; |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 752 | struct drbd_thread receiver; |
| 753 | struct drbd_thread worker; |
Philipp Reisner | 1c03e52 | 2015-03-16 15:01:00 +0100 | [diff] [blame] | 754 | struct drbd_thread ack_receiver; |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 755 | struct workqueue_struct *ack_sender; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 756 | |
Lars Ellenberg | 7753a4c1 | 2013-11-22 13:00:12 +0100 | [diff] [blame] | 757 | /* cached pointers, |
| 758 | * so we can look up the oldest pending requests more quickly. |
| 759 | * protected by resource->req_lock */ |
| 760 | struct drbd_request *req_next; /* DRBD 9: todo.req_next */ |
| 761 | struct drbd_request *req_ack_pending; |
| 762 | struct drbd_request *req_not_net_done; |
| 763 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 764 | /* sender side */ |
Lars Ellenberg | d5b27b0 | 2011-11-14 15:42:37 +0100 | [diff] [blame] | 765 | struct drbd_work_queue sender_work; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 766 | |
Lars Ellenberg | 944410e | 2014-05-06 15:02:05 +0200 | [diff] [blame] | 767 | #define DRBD_THREAD_DETAILS_HIST 16 |
| 768 | unsigned int w_cb_nr; /* keeps counting up */ |
| 769 | unsigned int r_cb_nr; /* keeps counting up */ |
| 770 | struct drbd_thread_timing_details w_timing_details[DRBD_THREAD_DETAILS_HIST]; |
| 771 | struct drbd_thread_timing_details r_timing_details[DRBD_THREAD_DETAILS_HIST]; |
| 772 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 773 | struct { |
Lars Ellenberg | 84d34f2 | 2015-02-19 13:54:11 +0100 | [diff] [blame] | 774 | unsigned long last_sent_barrier_jif; |
| 775 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 776 | /* whether this sender thread |
| 777 | * has processed a single write yet. */ |
| 778 | bool seen_any_write_yet; |
| 779 | |
| 780 | /* Which barrier number to send with the next P_BARRIER */ |
| 781 | int current_epoch_nr; |
| 782 | |
| 783 | /* how many write requests have been sent |
| 784 | * with req->epoch == current_epoch_nr. |
| 785 | * If none, no P_BARRIER will be sent. */ |
| 786 | unsigned current_epoch_writes; |
| 787 | } send; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 788 | }; |
| 789 | |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 790 | static inline bool has_net_conf(struct drbd_connection *connection) |
| 791 | { |
| 792 | bool has_net_conf; |
| 793 | |
| 794 | rcu_read_lock(); |
| 795 | has_net_conf = rcu_dereference(connection->net_conf); |
| 796 | rcu_read_unlock(); |
| 797 | |
| 798 | return has_net_conf; |
| 799 | } |
| 800 | |
Lars Ellenberg | 944410e | 2014-05-06 15:02:05 +0200 | [diff] [blame] | 801 | void __update_timing_details( |
| 802 | struct drbd_thread_timing_details *tdp, |
| 803 | unsigned int *cb_nr, |
| 804 | void *cb, |
| 805 | const char *fn, const unsigned int line); |
| 806 | |
| 807 | #define update_worker_timing_details(c, cb) \ |
| 808 | __update_timing_details(c->w_timing_details, &c->w_cb_nr, cb, __func__ , __LINE__ ) |
| 809 | #define update_receiver_timing_details(c, cb) \ |
| 810 | __update_timing_details(c->r_timing_details, &c->r_cb_nr, cb, __func__ , __LINE__ ) |
| 811 | |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 812 | struct submit_worker { |
| 813 | struct workqueue_struct *wq; |
| 814 | struct work_struct worker; |
| 815 | |
Lars Ellenberg | 844a6ae | 2013-11-22 12:52:03 +0100 | [diff] [blame] | 816 | /* protected by ..->resource->req_lock */ |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 817 | struct list_head writes; |
| 818 | }; |
| 819 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 820 | struct drbd_peer_device { |
| 821 | struct list_head peer_devices; |
| 822 | struct drbd_device *device; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 823 | struct drbd_connection *connection; |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 824 | struct work_struct send_acks_work; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 825 | #ifdef CONFIG_DEBUG_FS |
| 826 | struct dentry *debugfs_peer_dev; |
| 827 | #endif |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 828 | }; |
| 829 | |
| 830 | struct drbd_device { |
Andreas Gruenbacher | d8628a8 | 2011-06-09 01:38:00 +0200 | [diff] [blame] | 831 | struct drbd_resource *resource; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 832 | struct list_head peer_devices; |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 833 | struct list_head pending_bitmap_io; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 834 | |
| 835 | unsigned long flush_jif; |
| 836 | #ifdef CONFIG_DEBUG_FS |
| 837 | struct dentry *debugfs_minor; |
| 838 | struct dentry *debugfs_vol; |
| 839 | struct dentry *debugfs_vol_oldest_requests; |
| 840 | struct dentry *debugfs_vol_act_log_extents; |
| 841 | struct dentry *debugfs_vol_resync_extents; |
| 842 | struct dentry *debugfs_vol_data_gen_id; |
Lars Ellenberg | f5ec017 | 2015-03-18 17:19:10 +0100 | [diff] [blame] | 843 | struct dentry *debugfs_vol_ed_gen_id; |
Lars Ellenberg | 4d3d5aa | 2014-05-02 13:19:51 +0200 | [diff] [blame] | 844 | #endif |
| 845 | |
| 846 | unsigned int vnr; /* volume number within the connection */ |
| 847 | unsigned int minor; /* device minor number */ |
| 848 | |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 849 | struct kref kref; |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 850 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 851 | /* things that are stored as / read from meta data on disk */ |
| 852 | unsigned long flags; |
| 853 | |
| 854 | /* configured by drbdsetup */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 855 | struct drbd_backing_dev *ldev __protected_by(local); |
| 856 | |
| 857 | sector_t p_size; /* partner's disk size */ |
| 858 | struct request_queue *rq_queue; |
| 859 | struct block_device *this_bdev; |
| 860 | struct gendisk *vdisk; |
| 861 | |
Lars Ellenberg | 07be15b | 2012-05-07 11:53:08 +0200 | [diff] [blame] | 862 | unsigned long last_reattach_jif; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 863 | struct drbd_work resync_work; |
| 864 | struct drbd_work unplug_work; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 865 | struct timer_list resync_timer; |
| 866 | struct timer_list md_sync_timer; |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 867 | struct timer_list start_resync_timer; |
Philipp Reisner | 7fde2be | 2011-03-01 11:08:28 +0100 | [diff] [blame] | 868 | struct timer_list request_timer; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 869 | |
| 870 | /* Used after attach while negotiating new disk state. */ |
| 871 | union drbd_state new_state_tmp; |
| 872 | |
Philipp Reisner | da9fbc2 | 2011-03-29 10:52:01 +0200 | [diff] [blame] | 873 | union drbd_dev_state state; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 874 | wait_queue_head_t misc_wait; |
| 875 | wait_queue_head_t state_wait; /* upon each state change. */ |
| 876 | unsigned int send_cnt; |
| 877 | unsigned int recv_cnt; |
| 878 | unsigned int read_cnt; |
| 879 | unsigned int writ_cnt; |
| 880 | unsigned int al_writ_cnt; |
| 881 | unsigned int bm_writ_cnt; |
| 882 | atomic_t ap_bio_cnt; /* Requests we need to complete */ |
Lars Ellenberg | ad3fee7 | 2013-12-20 11:22:13 +0100 | [diff] [blame] | 883 | atomic_t ap_actlog_cnt; /* Requests waiting for activity log */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 884 | atomic_t ap_pending_cnt; /* AP data packets on the wire, ack expected */ |
| 885 | atomic_t rs_pending_cnt; /* RS request/data packets on the wire */ |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 886 | atomic_t unacked_cnt; /* Need to send replies for */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 887 | atomic_t local_cnt; /* Waiting for local completion */ |
Philipp Reisner | 7dbb438 | 2013-02-28 10:30:19 +0100 | [diff] [blame] | 888 | atomic_t suspend_cnt; |
Philipp Reisner | b2fb6dbe | 2011-01-19 13:48:44 +0100 | [diff] [blame] | 889 | |
Andreas Gruenbacher | dac1389 | 2011-01-21 17:18:39 +0100 | [diff] [blame] | 890 | /* Interval tree of pending local requests */ |
| 891 | struct rb_root read_requests; |
Andreas Gruenbacher | de69671 | 2011-01-20 15:00:24 +0100 | [diff] [blame] | 892 | struct rb_root write_requests; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 893 | |
Lars Ellenberg | 844a6ae | 2013-11-22 12:52:03 +0100 | [diff] [blame] | 894 | /* for statistics and timeouts */ |
| 895 | /* [0] read, [1] write */ |
| 896 | struct list_head pending_master_completion[2]; |
| 897 | struct list_head pending_completion[2]; |
| 898 | |
Lars Ellenberg | aaaba34 | 2014-03-18 12:30:09 +0100 | [diff] [blame] | 899 | /* use checksums for *this* resync */ |
| 900 | bool use_csums; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 901 | /* blocks to resync in this run [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 902 | unsigned long rs_total; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 903 | /* number of resync blocks that failed in this run */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 904 | unsigned long rs_failed; |
| 905 | /* Syncer's start time [unit jiffies] */ |
| 906 | unsigned long rs_start; |
| 907 | /* cumulated time in PausedSyncX state [unit jiffies] */ |
| 908 | unsigned long rs_paused; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 909 | /* skipped because csum was equal [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 910 | unsigned long rs_same_csum; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 911 | #define DRBD_SYNC_MARKS 8 |
| 912 | #define DRBD_SYNC_MARK_STEP (3*HZ) |
| 913 | /* block not up-to-date at mark [unit BM_BLOCK_SIZE] */ |
| 914 | unsigned long rs_mark_left[DRBD_SYNC_MARKS]; |
| 915 | /* marks's time [unit jiffies] */ |
| 916 | unsigned long rs_mark_time[DRBD_SYNC_MARKS]; |
| 917 | /* current index into rs_mark_{left,time} */ |
| 918 | int rs_last_mark; |
Philipp Reisner | 328e0f12 | 2012-10-19 14:37:47 +0200 | [diff] [blame] | 919 | unsigned long rs_last_bcast; /* [unit jiffies] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 920 | |
| 921 | /* where does the admin want us to start? (sector) */ |
| 922 | sector_t ov_start_sector; |
Lars Ellenberg | 02b91b5 | 2012-06-28 18:26:52 +0200 | [diff] [blame] | 923 | sector_t ov_stop_sector; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 924 | /* where are we now? (sector) */ |
| 925 | sector_t ov_position; |
| 926 | /* Start sector of out of sync range (to merge printk reporting). */ |
| 927 | sector_t ov_last_oos_start; |
| 928 | /* size of out-of-sync range in sectors. */ |
| 929 | sector_t ov_last_oos_size; |
| 930 | unsigned long ov_left; /* in bits */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 931 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 932 | struct drbd_bitmap *bitmap; |
| 933 | unsigned long bm_resync_fo; /* bit offset for drbd_bm_find_next */ |
| 934 | |
| 935 | /* Used to track operations of resync... */ |
| 936 | struct lru_cache *resync; |
| 937 | /* Number of locked elements in resync LRU */ |
| 938 | unsigned int resync_locked; |
| 939 | /* resync extent number waiting for application requests */ |
| 940 | unsigned int resync_wenr; |
| 941 | |
| 942 | int open_cnt; |
| 943 | u64 *p_uuid; |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 944 | |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 945 | struct list_head active_ee; /* IO in progress (P_DATA gets written to disk) */ |
| 946 | 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] | 947 | struct list_head done_ee; /* need to send P_WRITE_ACK */ |
| 948 | struct list_head read_ee; /* [RS]P_DATA_REQUEST being read */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 949 | struct list_head net_ee; /* zero-copy network send in progress */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 950 | |
| 951 | int next_barrier_nr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 952 | struct list_head resync_reads; |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 953 | atomic_t pp_in_use; /* allocated from page pool */ |
| 954 | 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] | 955 | wait_queue_head_t ee_wait; |
Philipp Reisner | cc94c65 | 2011-06-26 11:20:27 +0200 | [diff] [blame] | 956 | struct drbd_md_io md_io; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 957 | spinlock_t al_lock; |
| 958 | wait_queue_head_t al_wait; |
| 959 | struct lru_cache *act_log; /* activity log */ |
| 960 | unsigned int al_tr_number; |
| 961 | int al_tr_cycle; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 962 | wait_queue_head_t seq_wait; |
| 963 | atomic_t packet_seq; |
| 964 | unsigned int peer_seq; |
| 965 | spinlock_t peer_seq_lock; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 966 | unsigned long comm_bm_set; /* communicated number of set bits. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 967 | struct bm_io_work bm_io_work; |
| 968 | u64 ed_uuid; /* UUID of the exposed data */ |
Philipp Reisner | 8410da8 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 969 | struct mutex own_state_mutex; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 970 | 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] | 971 | char congestion_reason; /* Why we where congested... */ |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 972 | atomic_t rs_sect_in; /* for incoming resync data rate, SyncTarget */ |
| 973 | atomic_t rs_sect_ev; /* for submitted resync data rate, both */ |
| 974 | int rs_last_sect_ev; /* counter to compare with */ |
| 975 | int rs_last_events; /* counter of read or write "events" (unit sectors) |
| 976 | * on the lower level device when we last looked. */ |
| 977 | int c_sync_rate; /* current resync rate after syncer throttle magic */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 978 | 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] | 979 | 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] | 980 | atomic_t ap_in_flight; /* App sectors in flight (waiting for ack) */ |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 981 | unsigned int peer_max_bio_size; |
| 982 | unsigned int local_max_bio_size; |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 983 | |
| 984 | /* any requests that would block in drbd_make_request() |
| 985 | * are deferred to this single-threaded work queue */ |
| 986 | struct submit_worker submit; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 987 | }; |
| 988 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 989 | struct drbd_bm_aio_ctx { |
| 990 | struct drbd_device *device; |
| 991 | struct list_head list; /* on device->pending_bitmap_io */; |
| 992 | unsigned long start_jif; |
| 993 | atomic_t in_flight; |
| 994 | unsigned int done; |
| 995 | unsigned flags; |
| 996 | #define BM_AIO_COPY_PAGES 1 |
| 997 | #define BM_AIO_WRITE_HINTED 2 |
| 998 | #define BM_AIO_WRITE_ALL_PAGES 4 |
| 999 | #define BM_AIO_READ 8 |
| 1000 | int error; |
| 1001 | struct kref kref; |
| 1002 | }; |
| 1003 | |
Lars Ellenberg | a910b12 | 2014-04-28 18:43:21 +0200 | [diff] [blame] | 1004 | struct drbd_config_context { |
| 1005 | /* assigned from drbd_genlmsghdr */ |
| 1006 | unsigned int minor; |
| 1007 | /* assigned from request attributes, if present */ |
| 1008 | unsigned int volume; |
| 1009 | #define VOLUME_UNSPECIFIED (-1U) |
| 1010 | /* pointer into the request skb, |
| 1011 | * limited lifetime! */ |
| 1012 | char *resource_name; |
| 1013 | struct nlattr *my_addr; |
| 1014 | struct nlattr *peer_addr; |
| 1015 | |
| 1016 | /* reply buffer */ |
| 1017 | struct sk_buff *reply_skb; |
| 1018 | /* pointer into reply buffer */ |
| 1019 | struct drbd_genlmsghdr *reply_dh; |
| 1020 | /* resolved from attributes, if possible */ |
| 1021 | struct drbd_device *device; |
| 1022 | struct drbd_resource *resource; |
| 1023 | struct drbd_connection *connection; |
| 1024 | }; |
| 1025 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1026 | static inline struct drbd_device *minor_to_device(unsigned int minor) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1027 | { |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 1028 | return (struct drbd_device *)idr_find(&drbd_devices, minor); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1031 | static inline struct drbd_peer_device *first_peer_device(struct drbd_device *device) |
| 1032 | { |
Lars Ellenberg | ec4a340 | 2014-04-28 18:43:35 +0200 | [diff] [blame] | 1033 | return list_first_entry_or_null(&device->peer_devices, struct drbd_peer_device, peer_devices); |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1034 | } |
| 1035 | |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1036 | static inline struct drbd_peer_device * |
| 1037 | conn_peer_device(struct drbd_connection *connection, int volume_number) |
| 1038 | { |
| 1039 | return idr_find(&connection->peer_devices, volume_number); |
| 1040 | } |
| 1041 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 1042 | #define for_each_resource(resource, _resources) \ |
| 1043 | list_for_each_entry(resource, _resources, resources) |
| 1044 | |
| 1045 | #define for_each_resource_rcu(resource, _resources) \ |
| 1046 | list_for_each_entry_rcu(resource, _resources, resources) |
| 1047 | |
| 1048 | #define for_each_resource_safe(resource, tmp, _resources) \ |
| 1049 | list_for_each_entry_safe(resource, tmp, _resources, resources) |
| 1050 | |
| 1051 | #define for_each_connection(connection, resource) \ |
| 1052 | list_for_each_entry(connection, &resource->connections, connections) |
| 1053 | |
| 1054 | #define for_each_connection_rcu(connection, resource) \ |
| 1055 | list_for_each_entry_rcu(connection, &resource->connections, connections) |
| 1056 | |
| 1057 | #define for_each_connection_safe(connection, tmp, resource) \ |
| 1058 | list_for_each_entry_safe(connection, tmp, &resource->connections, connections) |
| 1059 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1060 | #define for_each_peer_device(peer_device, device) \ |
| 1061 | list_for_each_entry(peer_device, &device->peer_devices, peer_devices) |
| 1062 | |
| 1063 | #define for_each_peer_device_rcu(peer_device, device) \ |
| 1064 | list_for_each_entry_rcu(peer_device, &device->peer_devices, peer_devices) |
| 1065 | |
| 1066 | #define for_each_peer_device_safe(peer_device, tmp, device) \ |
| 1067 | list_for_each_entry_safe(peer_device, tmp, &device->peer_devices, peer_devices) |
| 1068 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1069 | static inline unsigned int device_to_minor(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1070 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1071 | return device->minor; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1072 | } |
| 1073 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1074 | /* |
| 1075 | * function declarations |
| 1076 | *************************/ |
| 1077 | |
| 1078 | /* drbd_main.c */ |
| 1079 | |
Philipp Reisner | e89b591 | 2010-03-24 17:11:33 +0100 | [diff] [blame] | 1080 | enum dds_flags { |
| 1081 | DDSF_FORCED = 1, |
| 1082 | DDSF_NO_RESYNC = 2, /* Do not run a resync for the new space */ |
| 1083 | }; |
| 1084 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1085 | extern void drbd_init_set_defaults(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1086 | extern int drbd_thread_start(struct drbd_thread *thi); |
| 1087 | extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait); |
| 1088 | #ifdef CONFIG_SMP |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 1089 | extern void drbd_thread_current_set_cpu(struct drbd_thread *thi); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1090 | #else |
| 1091 | #define drbd_thread_current_set_cpu(A) ({}) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1092 | #endif |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1093 | extern void tl_release(struct drbd_connection *, unsigned int barrier_nr, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1094 | unsigned int set_size); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1095 | extern void tl_clear(struct drbd_connection *); |
| 1096 | extern void drbd_free_sock(struct drbd_connection *connection); |
| 1097 | extern int drbd_send(struct drbd_connection *connection, struct socket *sock, |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1098 | void *buf, size_t size, unsigned msg_flags); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1099 | 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] | 1100 | unsigned); |
| 1101 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1102 | extern int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd); |
| 1103 | extern int drbd_send_protocol(struct drbd_connection *connection); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1104 | extern int drbd_send_uuids(struct drbd_peer_device *); |
| 1105 | extern int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *); |
| 1106 | extern void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *); |
| 1107 | extern int drbd_send_sizes(struct drbd_peer_device *, int trigger_reply, enum dds_flags flags); |
| 1108 | extern int drbd_send_state(struct drbd_peer_device *, union drbd_state s); |
| 1109 | extern int drbd_send_current_state(struct drbd_peer_device *); |
| 1110 | extern int drbd_send_sync_param(struct drbd_peer_device *); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1111 | 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] | 1112 | u32 set_size); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1113 | extern int drbd_send_ack(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 1114 | struct drbd_peer_request *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1115 | 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] | 1116 | struct p_block_req *rp); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1117 | 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] | 1118 | struct p_data *dp, int data_size); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1119 | 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] | 1120 | sector_t sector, int blksize, u64 block_id); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1121 | extern int drbd_send_out_of_sync(struct drbd_peer_device *, struct drbd_request *); |
| 1122 | extern int drbd_send_block(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 1123 | struct drbd_peer_request *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1124 | extern int drbd_send_dblock(struct drbd_peer_device *, struct drbd_request *req); |
| 1125 | extern int drbd_send_drequest(struct drbd_peer_device *, int cmd, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1126 | sector_t sector, int size, u64 block_id); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1127 | 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] | 1128 | int size, void *digest, int digest_size, |
| 1129 | enum drbd_packet cmd); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1130 | 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] | 1131 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1132 | extern int drbd_send_bitmap(struct drbd_device *device); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1133 | 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] | 1134 | 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] | 1135 | 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] | 1136 | 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] | 1137 | extern void drbd_device_cleanup(struct drbd_device *device); |
| 1138 | void drbd_print_uuids(struct drbd_device *device, const char *text); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1139 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1140 | extern void conn_md_sync(struct drbd_connection *connection); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1141 | extern void drbd_md_write(struct drbd_device *device, void *buffer); |
| 1142 | extern void drbd_md_sync(struct drbd_device *device); |
| 1143 | extern int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev); |
| 1144 | extern void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 1145 | extern void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 1146 | extern void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local); |
| 1147 | extern void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local); |
| 1148 | extern void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local); |
| 1149 | extern void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 1150 | extern void drbd_md_set_flag(struct drbd_device *device, int flags) __must_hold(local); |
| 1151 | 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] | 1152 | extern int drbd_md_test_flag(struct drbd_backing_dev *, int); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1153 | extern void drbd_md_mark_dirty(struct drbd_device *device); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1154 | extern void drbd_queue_bitmap_io(struct drbd_device *device, |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1155 | int (*io_fn)(struct drbd_device *), |
| 1156 | void (*done)(struct drbd_device *, int), |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1157 | char *why, enum bm_flag flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1158 | extern int drbd_bitmap_io(struct drbd_device *device, |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1159 | int (*io_fn)(struct drbd_device *), |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1160 | char *why, enum bm_flag flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1161 | extern int drbd_bitmap_io_from_worker(struct drbd_device *device, |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1162 | int (*io_fn)(struct drbd_device *), |
Lars Ellenberg | edc9f5e | 2012-09-27 15:18:21 +0200 | [diff] [blame] | 1163 | char *why, enum bm_flag flags); |
Philipp Reisner | 8fe39aa | 2013-11-22 13:22:13 +0100 | [diff] [blame] | 1164 | extern int drbd_bmio_set_n_write(struct drbd_device *device) __must_hold(local); |
| 1165 | extern int drbd_bmio_clear_n_write(struct drbd_device *device) __must_hold(local); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1166 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1167 | /* Meta data layout |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1168 | * |
| 1169 | * We currently have two possible layouts. |
| 1170 | * Offsets in (512 byte) sectors. |
| 1171 | * external: |
| 1172 | * |----------- md_size_sect ------------------| |
| 1173 | * [ 4k superblock ][ activity log ][ Bitmap ] |
| 1174 | * | al_offset == 8 | |
| 1175 | * | bm_offset = al_offset + X | |
| 1176 | * ==> bitmap sectors = md_size_sect - bm_offset |
| 1177 | * |
| 1178 | * Variants: |
| 1179 | * old, indexed fixed size meta data: |
| 1180 | * |
| 1181 | * internal: |
| 1182 | * |----------- md_size_sect ------------------| |
| 1183 | * [data.....][ Bitmap ][ activity log ][ 4k superblock ][padding*] |
| 1184 | * | al_offset < 0 | |
| 1185 | * | bm_offset = al_offset - Y | |
| 1186 | * ==> bitmap sectors = Y = al_offset - bm_offset |
| 1187 | * |
| 1188 | * [padding*] are zero or up to 7 unused 512 Byte sectors to the |
| 1189 | * end of the device, so that the [4k superblock] will be 4k aligned. |
| 1190 | * |
| 1191 | * The activity log consists of 4k transaction blocks, |
| 1192 | * which are written in a ring-buffer, or striped ring-buffer like fashion, |
| 1193 | * which are writtensize used to be fixed 32kB, |
| 1194 | * but is about to become configurable. |
| 1195 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1196 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1197 | /* Our old fixed size meta data layout |
| 1198 | * allows up to about 3.8TB, so if you want more, |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 1199 | * you need to use the "flexible" meta data format. */ |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1200 | #define MD_128MB_SECT (128LLU << 11) /* 128 MB, unit sectors */ |
| 1201 | #define MD_4kB_SECT 8 |
| 1202 | #define MD_32kB_SECT 64 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1203 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 1204 | /* One activity log extent represents 4M of storage */ |
| 1205 | #define AL_EXTENT_SHIFT 22 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1206 | #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT) |
| 1207 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 1208 | /* We could make these currently hardcoded constants configurable |
| 1209 | * variables at create-md time (or even re-configurable at runtime?). |
| 1210 | * Which will require some more changes to the DRBD "super block" |
| 1211 | * and attach code. |
| 1212 | * |
| 1213 | * updates per transaction: |
| 1214 | * This many changes to the active set can be logged with one transaction. |
| 1215 | * This number is arbitrary. |
| 1216 | * context per transaction: |
| 1217 | * This many context extent numbers are logged with each transaction. |
| 1218 | * This number is resulting from the transaction block size (4k), the layout |
| 1219 | * of the transaction header, and the number of updates per transaction. |
| 1220 | * See drbd_actlog.c:struct al_transaction_on_disk |
| 1221 | * */ |
| 1222 | #define AL_UPDATES_PER_TRANSACTION 64 // arbitrary |
| 1223 | #define AL_CONTEXT_PER_TRANSACTION 919 // (4096 - 36 - 6*64)/4 |
| 1224 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1225 | #if BITS_PER_LONG == 32 |
| 1226 | #define LN2_BPL 5 |
| 1227 | #define cpu_to_lel(A) cpu_to_le32(A) |
| 1228 | #define lel_to_cpu(A) le32_to_cpu(A) |
| 1229 | #elif BITS_PER_LONG == 64 |
| 1230 | #define LN2_BPL 6 |
| 1231 | #define cpu_to_lel(A) cpu_to_le64(A) |
| 1232 | #define lel_to_cpu(A) le64_to_cpu(A) |
| 1233 | #else |
| 1234 | #error "LN2 of BITS_PER_LONG unknown!" |
| 1235 | #endif |
| 1236 | |
| 1237 | /* resync bitmap */ |
| 1238 | /* 16MB sized 'bitmap extent' to track syncer usage */ |
| 1239 | struct bm_extent { |
| 1240 | int rs_left; /* number of bits set (out of sync) in this extent. */ |
| 1241 | int rs_failed; /* number of failed resync requests in this extent. */ |
| 1242 | unsigned long flags; |
| 1243 | struct lc_element lce; |
| 1244 | }; |
| 1245 | |
| 1246 | #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */ |
| 1247 | #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */ |
Philipp Reisner | e3555d8 | 2010-11-07 15:56:29 +0100 | [diff] [blame] | 1248 | #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] | 1249 | |
| 1250 | /* drbd_bitmap.c */ |
| 1251 | /* |
| 1252 | * We need to store one bit for a block. |
| 1253 | * Example: 1GB disk @ 4096 byte blocks ==> we need 32 KB bitmap. |
| 1254 | * Bit 0 ==> local node thinks this block is binary identical on both nodes |
| 1255 | * Bit 1 ==> local node thinks this block needs to be synced. |
| 1256 | */ |
| 1257 | |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 1258 | #define SLEEP_TIME (HZ/10) |
| 1259 | |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1260 | /* We do bitmap IO in units of 4k blocks. |
| 1261 | * We also still have a hardcoded 4k per bit relation. */ |
| 1262 | #define BM_BLOCK_SHIFT 12 /* 4k per bit */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1263 | #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT) |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1264 | /* mostly arbitrarily set the represented size of one bitmap extent, |
| 1265 | * aka resync extent, to 16 MiB (which is also 512 Byte worth of bitmap |
| 1266 | * at 4k per bit resolution) */ |
| 1267 | #define BM_EXT_SHIFT 24 /* 16 MiB per resync extent */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1268 | #define BM_EXT_SIZE (1<<BM_EXT_SHIFT) |
| 1269 | |
| 1270 | #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12) |
| 1271 | #error "HAVE YOU FIXED drbdmeta AS WELL??" |
| 1272 | #endif |
| 1273 | |
| 1274 | /* thus many _storage_ sectors are described by one bit */ |
| 1275 | #define BM_SECT_TO_BIT(x) ((x)>>(BM_BLOCK_SHIFT-9)) |
| 1276 | #define BM_BIT_TO_SECT(x) ((sector_t)(x)<<(BM_BLOCK_SHIFT-9)) |
| 1277 | #define BM_SECT_PER_BIT BM_BIT_TO_SECT(1) |
| 1278 | |
| 1279 | /* bit to represented kilo byte conversion */ |
| 1280 | #define Bit2KB(bits) ((bits)<<(BM_BLOCK_SHIFT-10)) |
| 1281 | |
| 1282 | /* in which _bitmap_ extent (resp. sector) the bit for a certain |
| 1283 | * _storage_ sector is located in */ |
| 1284 | #define BM_SECT_TO_EXT(x) ((x)>>(BM_EXT_SHIFT-9)) |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1285 | #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] | 1286 | |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1287 | /* first storage sector a bitmap extent corresponds to */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1288 | #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] | 1289 | /* how much _storage_ sectors we have per bitmap extent */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1290 | #define BM_SECT_PER_EXT BM_EXT_TO_SECT(1) |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1291 | /* how many bits are covered by one bitmap extent (resync extent) */ |
| 1292 | #define BM_BITS_PER_EXT (1UL << (BM_EXT_SHIFT - BM_BLOCK_SHIFT)) |
| 1293 | |
| 1294 | #define BM_BLOCKS_PER_BM_EXT_MASK (BM_BITS_PER_EXT - 1) |
| 1295 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1296 | |
| 1297 | /* in one sector of the bitmap, we have this many activity_log extents. */ |
| 1298 | #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] | 1299 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1300 | /* the extent in "PER_EXTENT" below is an activity log extent |
| 1301 | * we need that many (long words/bytes) to store the bitmap |
| 1302 | * of one AL_EXTENT_SIZE chunk of storage. |
| 1303 | * we can store the bitmap for that many AL_EXTENTS within |
| 1304 | * one sector of the _on_disk_ bitmap: |
| 1305 | * bit 0 bit 37 bit 38 bit (512*8)-1 |
| 1306 | * ...|........|........|.. // ..|........| |
| 1307 | * sect. 0 `296 `304 ^(512*8*8)-1 |
| 1308 | * |
| 1309 | #define BM_WORDS_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / BITS_PER_LONG ) |
| 1310 | #define BM_BYTES_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / 8 ) // 128 |
| 1311 | #define BM_EXT_PER_SECT ( 512 / BM_BYTES_PER_EXTENT ) // 4 |
| 1312 | */ |
| 1313 | |
| 1314 | #define DRBD_MAX_SECTORS_32 (0xffffffffLU) |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1315 | /* we have a certain meta data variant that has a fixed on-disk size of 128 |
| 1316 | * MiB, of which 4k are our "superblock", and 32k are the fixed size activity |
| 1317 | * log, leaving this many sectors for the bitmap. |
| 1318 | */ |
| 1319 | |
| 1320 | #define DRBD_MAX_SECTORS_FIXED_BM \ |
| 1321 | ((MD_128MB_SECT - MD_32kB_SECT - MD_4kB_SECT) * (1LL<<(BM_EXT_SHIFT-9))) |
| 1322 | #if !defined(CONFIG_LBDAF) && BITS_PER_LONG == 32 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1323 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_32 |
| 1324 | #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_32 |
| 1325 | #else |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1326 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_FIXED_BM |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1327 | /* 16 TB in units of sectors */ |
| 1328 | #if BITS_PER_LONG == 32 |
| 1329 | /* adjust by one page worth of bitmap, |
| 1330 | * so we won't wrap around in drbd_bm_find_next_bit. |
| 1331 | * you should use 64bit OS for that much storage, anyways. */ |
| 1332 | #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) |
| 1333 | #else |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1334 | /* we allow up to 1 PiB now on 64bit architecture with "flexible" meta data */ |
| 1335 | #define DRBD_MAX_SECTORS_FLEX (1UL << 51) |
| 1336 | /* corresponds to (1UL << 38) bits right now. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1337 | #endif |
| 1338 | #endif |
| 1339 | |
Ming Lei | 8bf223c | 2016-05-30 21:34:35 +0800 | [diff] [blame] | 1340 | /* Estimate max bio size as 256 * PAGE_SIZE, |
Kirill A. Shutemov | ea1754a | 2016-04-01 15:29:48 +0300 | [diff] [blame] | 1341 | * so for typical PAGE_SIZE of 4k, that is (1<<20) Byte. |
Lars Ellenberg | 23361cf | 2011-03-31 16:36:43 +0200 | [diff] [blame] | 1342 | * Since we may live in a mixed-platform cluster, |
| 1343 | * we limit us to a platform agnostic constant here for now. |
| 1344 | * A followup commit may allow even bigger BIO sizes, |
| 1345 | * once we thought that through. */ |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 1346 | #define DRBD_MAX_BIO_SIZE (1U << 20) |
Ming Lei | 8bf223c | 2016-05-30 21:34:35 +0800 | [diff] [blame] | 1347 | #if DRBD_MAX_BIO_SIZE > (BIO_MAX_PAGES << PAGE_SHIFT) |
Lars Ellenberg | 23361cf | 2011-03-31 16:36:43 +0200 | [diff] [blame] | 1348 | #error Architecture not supported: DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE |
| 1349 | #endif |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 1350 | #define DRBD_MAX_BIO_SIZE_SAFE (1U << 12) /* Works always = 4k */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1351 | |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 1352 | #define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* Header 80 only allows packets up to 32KiB data */ |
| 1353 | #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] | 1354 | |
Lars Ellenberg | 505675f | 2016-06-14 00:26:23 +0200 | [diff] [blame] | 1355 | /* For now, don't allow more than half of what we can "activate" in one |
| 1356 | * activity log transaction to be discarded in one go. We may need to rework |
| 1357 | * drbd_al_begin_io() to allow for even larger discard ranges */ |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 1358 | #define DRBD_MAX_BATCH_BIO_SIZE (AL_UPDATES_PER_TRANSACTION/2*AL_EXTENT_SIZE) |
| 1359 | #define DRBD_MAX_BBIO_SECTORS (DRBD_MAX_BATCH_BIO_SIZE >> 9) |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 1360 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1361 | extern int drbd_bm_init(struct drbd_device *device); |
| 1362 | extern int drbd_bm_resize(struct drbd_device *device, sector_t sectors, int set_new_bits); |
| 1363 | extern void drbd_bm_cleanup(struct drbd_device *device); |
| 1364 | extern void drbd_bm_set_all(struct drbd_device *device); |
| 1365 | extern void drbd_bm_clear_all(struct drbd_device *device); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1366 | /* set/clear/test only a few bits at a time */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1367 | extern int drbd_bm_set_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1368 | struct drbd_device *device, unsigned long s, unsigned long e); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1369 | extern int drbd_bm_clear_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1370 | struct drbd_device *device, unsigned long s, unsigned long e); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1371 | extern int drbd_bm_count_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1372 | struct drbd_device *device, const unsigned long s, const unsigned long e); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1373 | /* bm_set_bits variant for use while holding drbd_bm_lock, |
| 1374 | * may process the whole bitmap in one go */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1375 | extern void _drbd_bm_set_bits(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1376 | const unsigned long s, const unsigned long e); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1377 | extern int drbd_bm_test_bit(struct drbd_device *device, unsigned long bitnr); |
| 1378 | extern int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1379 | extern int drbd_bm_read(struct drbd_device *device) __must_hold(local); |
| 1380 | extern void drbd_bm_mark_for_writeout(struct drbd_device *device, int page_nr); |
| 1381 | extern int drbd_bm_write(struct drbd_device *device) __must_hold(local); |
Lars Ellenberg | 27ea1d8 | 2016-06-14 00:26:38 +0200 | [diff] [blame] | 1382 | 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] | 1383 | 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] | 1384 | extern int drbd_bm_write_lazy(struct drbd_device *device, unsigned upper_idx) __must_hold(local); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1385 | extern int drbd_bm_write_all(struct drbd_device *device) __must_hold(local); |
| 1386 | extern int drbd_bm_write_copy_pages(struct drbd_device *device) __must_hold(local); |
| 1387 | extern size_t drbd_bm_words(struct drbd_device *device); |
| 1388 | extern unsigned long drbd_bm_bits(struct drbd_device *device); |
| 1389 | extern sector_t drbd_bm_capacity(struct drbd_device *device); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1390 | |
| 1391 | #define DRBD_END_OF_BITMAP (~(unsigned long)0) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1392 | 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] | 1393 | /* bm_find_next variants for use while you hold drbd_bm_lock() */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1394 | extern unsigned long _drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); |
| 1395 | extern unsigned long _drbd_bm_find_next_zero(struct drbd_device *device, unsigned long bm_fo); |
| 1396 | extern unsigned long _drbd_bm_total_weight(struct drbd_device *device); |
| 1397 | extern unsigned long drbd_bm_total_weight(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1398 | /* for receive_bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1399 | 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] | 1400 | size_t number, unsigned long *buffer); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1401 | /* for _drbd_send_bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1402 | 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] | 1403 | size_t number, unsigned long *buffer); |
| 1404 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1405 | extern void drbd_bm_lock(struct drbd_device *device, char *why, enum bm_flag flags); |
| 1406 | extern void drbd_bm_unlock(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1407 | /* drbd_main.c */ |
| 1408 | |
| 1409 | extern struct kmem_cache *drbd_request_cache; |
Andreas Gruenbacher | 6c852be | 2011-02-04 15:38:52 +0100 | [diff] [blame] | 1410 | extern struct kmem_cache *drbd_ee_cache; /* peer requests */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1411 | extern struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
| 1412 | extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
| 1413 | extern mempool_t *drbd_request_mempool; |
| 1414 | extern mempool_t *drbd_ee_mempool; |
| 1415 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1416 | /* drbd's page pool, used to buffer data received from the peer, |
| 1417 | * or data requested by the peer. |
| 1418 | * |
| 1419 | * This does not have an emergency reserve. |
| 1420 | * |
| 1421 | * When allocating from this pool, it first takes pages from the pool. |
| 1422 | * Only if the pool is depleted will try to allocate from the system. |
| 1423 | * |
| 1424 | * The assumption is that pages taken from this pool will be processed, |
| 1425 | * and given back, "quickly", and then can be recycled, so we can avoid |
| 1426 | * frequent calls to alloc_page(), and still will be able to make progress even |
| 1427 | * under memory pressure. |
| 1428 | */ |
| 1429 | extern struct page *drbd_pp_pool; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1430 | extern spinlock_t drbd_pp_lock; |
| 1431 | extern int drbd_pp_vacant; |
| 1432 | extern wait_queue_head_t drbd_pp_wait; |
| 1433 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1434 | /* We also need a standard (emergency-reserve backed) page pool |
| 1435 | * for meta data IO (activity log, bitmap). |
| 1436 | * We can keep it global, as long as it is used as "N pages at a time". |
| 1437 | * 128 should be plenty, currently we probably can get away with as few as 1. |
| 1438 | */ |
| 1439 | #define DRBD_MIN_POOL_PAGES 128 |
| 1440 | extern mempool_t *drbd_md_io_page_pool; |
| 1441 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 1442 | /* We also need to make sure we get a bio |
| 1443 | * when we need it for housekeeping purposes */ |
| 1444 | extern struct bio_set *drbd_md_io_bio_set; |
| 1445 | /* to allocate from that set */ |
| 1446 | extern struct bio *bio_alloc_drbd(gfp_t gfp_mask); |
| 1447 | |
Andreas Gruenbacher | 28bc3b8 | 2014-08-14 18:33:30 +0200 | [diff] [blame] | 1448 | extern struct mutex resources_mutex; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1449 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1450 | extern int conn_lowest_minor(struct drbd_connection *connection); |
Lars Ellenberg | a910b12 | 2014-04-28 18:43:21 +0200 | [diff] [blame] | 1451 | 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] | 1452 | extern void drbd_destroy_device(struct kref *kref); |
Lars Ellenberg | a910b12 | 2014-04-28 18:43:21 +0200 | [diff] [blame] | 1453 | extern void drbd_delete_device(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1454 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 1455 | extern struct drbd_resource *drbd_create_resource(const char *name); |
| 1456 | extern void drbd_free_resource(struct drbd_resource *resource); |
| 1457 | |
Andreas Gruenbacher | eb6bea6 | 2011-06-21 16:11:28 +0200 | [diff] [blame] | 1458 | 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] | 1459 | 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] | 1460 | extern void drbd_destroy_connection(struct kref *kref); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1461 | 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] | 1462 | void *peer_addr, int peer_addr_len); |
Andreas Gruenbacher | 4bc7604 | 2011-06-13 14:27:45 +0200 | [diff] [blame] | 1463 | extern struct drbd_resource *drbd_find_resource(const char *name); |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 1464 | extern void drbd_destroy_resource(struct kref *kref); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1465 | extern void conn_free_crypto(struct drbd_connection *connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1466 | |
| 1467 | extern int proc_details; |
| 1468 | |
| 1469 | /* drbd_req */ |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 1470 | extern void do_submit(struct work_struct *ws); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1471 | extern void __drbd_make_request(struct drbd_device *, struct bio *, unsigned long); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1472 | extern blk_qc_t drbd_make_request(struct request_queue *q, struct bio *bio); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1473 | 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] | 1474 | extern int is_valid_ar_handle(struct drbd_request *, sector_t); |
| 1475 | |
| 1476 | |
| 1477 | /* drbd_nl.c */ |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1478 | |
| 1479 | extern struct mutex notification_mutex; |
| 1480 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1481 | extern void drbd_suspend_io(struct drbd_device *device); |
| 1482 | extern void drbd_resume_io(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1483 | extern char *ppsize(char *buf, unsigned long long size); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1484 | 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] | 1485 | enum determine_dev_size { |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 1486 | DS_ERROR_SHRINK = -3, |
| 1487 | DS_ERROR_SPACE_MD = -2, |
Philipp Reisner | e96c963 | 2013-06-25 16:50:07 +0200 | [diff] [blame] | 1488 | DS_ERROR = -1, |
| 1489 | DS_UNCHANGED = 0, |
| 1490 | DS_SHRUNK = 1, |
Philipp Reisner | 57737ad | 2013-10-23 10:59:17 +0200 | [diff] [blame] | 1491 | DS_GREW = 2, |
| 1492 | DS_GREW_FROM_ZERO = 3, |
Philipp Reisner | e96c963 | 2013-06-25 16:50:07 +0200 | [diff] [blame] | 1493 | }; |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 1494 | extern enum determine_dev_size |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1495 | drbd_determine_dev_size(struct drbd_device *, enum dds_flags, struct resize_parms *) __must_hold(local); |
| 1496 | extern void resync_after_online_grow(struct drbd_device *); |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 1497 | extern void drbd_reconsider_queue_parameters(struct drbd_device *device, |
| 1498 | struct drbd_backing_dev *bdev, struct o_qlim *o); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1499 | extern enum drbd_state_rv drbd_set_role(struct drbd_device *device, |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1500 | enum drbd_role new_role, |
| 1501 | int force); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1502 | extern bool conn_try_outdate_peer(struct drbd_connection *connection); |
| 1503 | extern void conn_try_outdate_peer_async(struct drbd_connection *connection); |
Fabian Frederick | 7e5fec3 | 2016-06-14 00:26:35 +0200 | [diff] [blame] | 1504 | 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] | 1505 | extern int drbd_khelper(struct drbd_device *device, char *cmd); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1506 | |
| 1507 | /* drbd_worker.c */ |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1508 | /* bi_end_io handlers */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1509 | extern void drbd_md_endio(struct bio *bio); |
| 1510 | extern void drbd_peer_request_endio(struct bio *bio); |
| 1511 | extern void drbd_request_endio(struct bio *bio); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1512 | extern int drbd_worker(struct drbd_thread *thi); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1513 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor); |
| 1514 | void drbd_resync_after_changed(struct drbd_device *device); |
| 1515 | extern void drbd_start_resync(struct drbd_device *device, enum drbd_conns side); |
| 1516 | extern void resume_next_sg(struct drbd_device *device); |
| 1517 | extern void suspend_other_sg(struct drbd_device *device); |
| 1518 | extern int drbd_resync_finished(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1519 | /* maybe rather drbd_main.c ? */ |
Lars Ellenberg | e37d243 | 2014-04-01 23:53:30 +0200 | [diff] [blame] | 1520 | 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] | 1521 | extern void drbd_md_put_buffer(struct drbd_device *device); |
| 1522 | extern int drbd_md_sync_page_io(struct drbd_device *device, |
Mike Christie | bb3cc85 | 2016-06-05 14:32:06 -0500 | [diff] [blame] | 1523 | struct drbd_backing_dev *bdev, sector_t sector, int op); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1524 | extern void drbd_ov_out_of_sync_found(struct drbd_device *, sector_t, int); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1525 | extern void wait_until_done_or_force_detached(struct drbd_device *device, |
Lars Ellenberg | 44edfb0 | 2012-09-27 13:03:45 +0200 | [diff] [blame] | 1526 | struct drbd_backing_dev *bdev, unsigned int *done); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1527 | extern void drbd_rs_controller_reset(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1528 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1529 | static inline void ov_out_of_sync_print(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1530 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1531 | if (device->ov_last_oos_size) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1532 | drbd_err(device, "Out of sync: start=%llu, size=%lu (sectors)\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1533 | (unsigned long long)device->ov_last_oos_start, |
| 1534 | (unsigned long)device->ov_last_oos_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1535 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1536 | device->ov_last_oos_size = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1537 | } |
| 1538 | |
| 1539 | |
Herbert Xu | 9534d67 | 2016-01-24 21:19:21 +0800 | [diff] [blame] | 1540 | extern void drbd_csum_bio(struct crypto_ahash *, struct bio *, void *); |
| 1541 | extern void drbd_csum_ee(struct crypto_ahash *, struct drbd_peer_request *, void *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1542 | /* worker callbacks */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1543 | extern int w_e_end_data_req(struct drbd_work *, int); |
| 1544 | extern int w_e_end_rsdata_req(struct drbd_work *, int); |
| 1545 | extern int w_e_end_csum_rs_req(struct drbd_work *, int); |
| 1546 | extern int w_e_end_ov_reply(struct drbd_work *, int); |
| 1547 | extern int w_e_end_ov_req(struct drbd_work *, int); |
| 1548 | extern int w_ov_finished(struct drbd_work *, int); |
| 1549 | extern int w_resync_timer(struct drbd_work *, int); |
| 1550 | extern int w_send_write_hint(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1551 | extern int w_send_dblock(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1552 | extern int w_send_read_req(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1553 | extern int w_e_reissue(struct drbd_work *, int); |
| 1554 | extern int w_restart_disk_io(struct drbd_work *, int); |
Andreas Gruenbacher | 8f7bed7 | 2010-12-19 23:53:14 +0100 | [diff] [blame] | 1555 | extern int w_send_out_of_sync(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1556 | extern int w_start_resync(struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1557 | |
| 1558 | extern void resync_timer_fn(unsigned long data); |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 1559 | extern void start_resync_timer_fn(unsigned long data); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1560 | |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 1561 | extern void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req); |
| 1562 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1563 | /* drbd_receiver.c */ |
Lars Ellenberg | 7435e90 | 2016-06-14 00:26:22 +0200 | [diff] [blame] | 1564 | extern int drbd_issue_discard_or_zero_out(struct drbd_device *device, |
| 1565 | sector_t start, unsigned int nr_sectors, bool discard); |
Andreas Gruenbacher | 753c6191 | 2011-07-22 11:14:41 +0200 | [diff] [blame] | 1566 | extern int drbd_receiver(struct drbd_thread *thi); |
Philipp Reisner | 1c03e52 | 2015-03-16 15:01:00 +0100 | [diff] [blame] | 1567 | extern int drbd_ack_receiver(struct drbd_thread *thi); |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1568 | extern void drbd_send_ping_wf(struct work_struct *ws); |
| 1569 | extern void drbd_send_acks_wf(struct work_struct *ws); |
Lars Ellenberg | e829987 | 2014-04-28 18:43:19 +0200 | [diff] [blame] | 1570 | extern bool drbd_rs_c_min_rate_throttle(struct drbd_device *device); |
Lars Ellenberg | ad3fee7 | 2013-12-20 11:22:13 +0100 | [diff] [blame] | 1571 | extern bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, |
| 1572 | bool throttle_if_app_is_waiting); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1573 | extern int drbd_submit_peer_request(struct drbd_device *, |
Andreas Gruenbacher | fbe29de | 2011-02-17 16:38:35 +0100 | [diff] [blame] | 1574 | struct drbd_peer_request *, const unsigned, |
Mike Christie | bb3cc85 | 2016-06-05 14:32:06 -0500 | [diff] [blame] | 1575 | const unsigned, const int); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1576 | extern int drbd_free_peer_reqs(struct drbd_device *, struct list_head *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1577 | 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] | 1578 | sector_t, unsigned int, |
Lars Ellenberg | 9104d31 | 2016-06-14 00:26:31 +0200 | [diff] [blame] | 1579 | unsigned int, |
Andreas Gruenbacher | 0db5536 | 2011-04-06 16:09:15 +0200 | [diff] [blame] | 1580 | gfp_t) __must_hold(local); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1581 | 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] | 1582 | int); |
| 1583 | #define drbd_free_peer_req(m,e) __drbd_free_peer_req(m, e, 0) |
| 1584 | #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] | 1585 | 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] | 1586 | extern void drbd_set_recv_tcq(struct drbd_device *device, int tcq_enabled); |
| 1587 | 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] | 1588 | extern int drbd_connected(struct drbd_peer_device *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1589 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1590 | static inline void drbd_tcp_cork(struct socket *sock) |
| 1591 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1592 | int val = 1; |
Philipp Reisner | e805b98 | 2014-11-10 17:21:15 +0100 | [diff] [blame] | 1593 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_CORK, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1594 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1595 | } |
| 1596 | |
| 1597 | static inline void drbd_tcp_uncork(struct socket *sock) |
| 1598 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1599 | int val = 0; |
Philipp Reisner | e805b98 | 2014-11-10 17:21:15 +0100 | [diff] [blame] | 1600 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_CORK, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1601 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1602 | } |
| 1603 | |
| 1604 | static inline void drbd_tcp_nodelay(struct socket *sock) |
| 1605 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1606 | int val = 1; |
Philipp Reisner | e805b98 | 2014-11-10 17:21:15 +0100 | [diff] [blame] | 1607 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1608 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1609 | } |
| 1610 | |
| 1611 | static inline void drbd_tcp_quickack(struct socket *sock) |
| 1612 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1613 | int val = 2; |
Philipp Reisner | e805b98 | 2014-11-10 17:21:15 +0100 | [diff] [blame] | 1614 | (void) kernel_setsockopt(sock, SOL_TCP, TCP_QUICKACK, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1615 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1616 | } |
| 1617 | |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1618 | /* sets the number of 512 byte sectors of our virtual device */ |
| 1619 | static inline void drbd_set_my_capacity(struct drbd_device *device, |
| 1620 | sector_t size) |
| 1621 | { |
| 1622 | /* set_capacity(device->this_bdev->bd_disk, size); */ |
| 1623 | set_capacity(device->vdisk, size); |
| 1624 | device->this_bdev->bd_inode->i_size = (loff_t)size << 9; |
| 1625 | } |
| 1626 | |
| 1627 | /* |
| 1628 | * used to submit our private bio |
| 1629 | */ |
| 1630 | static inline void drbd_generic_make_request(struct drbd_device *device, |
| 1631 | int fault_type, struct bio *bio) |
| 1632 | { |
| 1633 | __release(local); |
| 1634 | if (!bio->bi_bdev) { |
Lars Ellenberg | f88c5d9 | 2014-03-27 14:10:55 +0100 | [diff] [blame] | 1635 | drbd_err(device, "drbd_generic_make_request: bio->bi_bdev == NULL\n"); |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1636 | bio->bi_error = -ENODEV; |
| 1637 | bio_endio(bio); |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1638 | return; |
| 1639 | } |
| 1640 | |
| 1641 | if (drbd_insert_fault(device, fault_type)) |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1642 | bio_io_error(bio); |
Philipp Reisner | d40e567 | 2014-04-28 18:43:14 +0200 | [diff] [blame] | 1643 | else |
| 1644 | generic_make_request(bio); |
| 1645 | } |
| 1646 | |
Philipp Reisner | 8fe39aa | 2013-11-22 13:22:13 +0100 | [diff] [blame] | 1647 | void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
| 1648 | enum write_ordering_e wo); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1649 | |
| 1650 | /* drbd_proc.c */ |
| 1651 | extern struct proc_dir_entry *drbd_proc; |
Emese Revfy | 7d4e9d0 | 2009-12-14 00:59:30 +0100 | [diff] [blame] | 1652 | extern const struct file_operations drbd_proc_fops; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1653 | |
| 1654 | /* drbd_actlog.c */ |
Lars Ellenberg | e4d7d6f | 2014-04-28 18:43:28 +0200 | [diff] [blame] | 1655 | 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] | 1656 | 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] | 1657 | extern void drbd_al_begin_io_commit(struct drbd_device *device); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1658 | 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] | 1659 | 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] | 1660 | extern void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i); |
| 1661 | extern void drbd_rs_complete_io(struct drbd_device *device, sector_t sector); |
| 1662 | extern int drbd_rs_begin_io(struct drbd_device *device, sector_t sector); |
| 1663 | extern int drbd_try_rs_begin_io(struct drbd_device *device, sector_t sector); |
| 1664 | extern void drbd_rs_cancel_all(struct drbd_device *device); |
| 1665 | extern int drbd_rs_del_all(struct drbd_device *device); |
| 1666 | extern void drbd_rs_failed_io(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1667 | sector_t sector, int size); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1668 | extern void drbd_advance_rs_marks(struct drbd_device *device, unsigned long still_to_go); |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1669 | |
| 1670 | enum update_sync_bits_mode { RECORD_RS_FAILED, SET_OUT_OF_SYNC, SET_IN_SYNC }; |
| 1671 | extern int __drbd_change_sync(struct drbd_device *device, sector_t sector, int size, |
Andreas Gruenbacher | 179e20b8 | 2014-11-10 17:21:09 +0100 | [diff] [blame] | 1672 | enum update_sync_bits_mode mode); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1673 | #define drbd_set_in_sync(device, sector, size) \ |
Andreas Gruenbacher | 179e20b8 | 2014-11-10 17:21:09 +0100 | [diff] [blame] | 1674 | __drbd_change_sync(device, sector, size, SET_IN_SYNC) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1675 | #define drbd_set_out_of_sync(device, sector, size) \ |
Andreas Gruenbacher | 179e20b8 | 2014-11-10 17:21:09 +0100 | [diff] [blame] | 1676 | __drbd_change_sync(device, sector, size, SET_OUT_OF_SYNC) |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 1677 | #define drbd_rs_failed_io(device, sector, size) \ |
Andreas Gruenbacher | 179e20b8 | 2014-11-10 17:21:09 +0100 | [diff] [blame] | 1678 | __drbd_change_sync(device, sector, size, RECORD_RS_FAILED) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1679 | extern void drbd_al_shrink(struct drbd_device *device); |
Lars Ellenberg | 5f7c012 | 2015-06-08 15:18:45 +0200 | [diff] [blame] | 1680 | extern int drbd_al_initialize(struct drbd_device *, void *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1681 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1682 | /* drbd_nl.c */ |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 1683 | /* state info broadcast */ |
| 1684 | struct sib_info { |
| 1685 | enum drbd_state_info_bcast_reason sib_reason; |
| 1686 | union { |
| 1687 | struct { |
| 1688 | char *helper_name; |
| 1689 | unsigned helper_exit_code; |
| 1690 | }; |
| 1691 | struct { |
| 1692 | union drbd_state os; |
| 1693 | union drbd_state ns; |
| 1694 | }; |
| 1695 | }; |
| 1696 | }; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1697 | 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] | 1698 | |
Andreas Gruenbacher | a297284 | 2014-07-31 17:41:33 +0200 | [diff] [blame] | 1699 | extern void notify_resource_state(struct sk_buff *, |
| 1700 | unsigned int, |
| 1701 | struct drbd_resource *, |
| 1702 | struct resource_info *, |
| 1703 | enum drbd_notification_type); |
| 1704 | extern void notify_device_state(struct sk_buff *, |
| 1705 | unsigned int, |
| 1706 | struct drbd_device *, |
| 1707 | struct device_info *, |
| 1708 | enum drbd_notification_type); |
| 1709 | extern void notify_connection_state(struct sk_buff *, |
| 1710 | unsigned int, |
| 1711 | struct drbd_connection *, |
| 1712 | struct connection_info *, |
| 1713 | enum drbd_notification_type); |
| 1714 | extern void notify_peer_device_state(struct sk_buff *, |
| 1715 | unsigned int, |
| 1716 | struct drbd_peer_device *, |
| 1717 | struct peer_device_info *, |
| 1718 | enum drbd_notification_type); |
| 1719 | extern void notify_helper(enum drbd_notification_type, struct drbd_device *, |
| 1720 | struct drbd_connection *, const char *, int); |
| 1721 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1722 | /* |
| 1723 | * inline helper functions |
| 1724 | *************************/ |
| 1725 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1726 | /* see also page_chain_add and friends in drbd_receiver.c */ |
| 1727 | static inline struct page *page_chain_next(struct page *page) |
| 1728 | { |
| 1729 | return (struct page *)page_private(page); |
| 1730 | } |
| 1731 | #define page_chain_for_each(page) \ |
| 1732 | for (; page && ({ prefetch(page_chain_next(page)); 1; }); \ |
| 1733 | page = page_chain_next(page)) |
| 1734 | #define page_chain_for_each_safe(page, n) \ |
| 1735 | for (; page && ({ n = page_chain_next(page); 1; }); page = n) |
| 1736 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1737 | |
Andreas Gruenbacher | 045417f | 2011-04-07 21:34:24 +0200 | [diff] [blame] | 1738 | 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] | 1739 | { |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1740 | struct page *page = peer_req->pages; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1741 | page_chain_for_each(page) { |
| 1742 | if (page_count(page) > 1) |
| 1743 | return 1; |
| 1744 | } |
| 1745 | return 0; |
| 1746 | } |
| 1747 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1748 | static inline union drbd_state drbd_read_state(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1749 | { |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 1750 | struct drbd_resource *resource = device->resource; |
Philipp Reisner | 78bae59 | 2011-03-28 15:40:12 +0200 | [diff] [blame] | 1751 | union drbd_state rv; |
| 1752 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1753 | rv.i = device->state.i; |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 1754 | rv.susp = resource->susp; |
| 1755 | rv.susp_nod = resource->susp_nod; |
| 1756 | rv.susp_fen = resource->susp_fen; |
Philipp Reisner | 78bae59 | 2011-03-28 15:40:12 +0200 | [diff] [blame] | 1757 | |
| 1758 | return rv; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1759 | } |
| 1760 | |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1761 | enum drbd_force_detach_flags { |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1762 | DRBD_READ_ERROR, |
| 1763 | DRBD_WRITE_ERROR, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1764 | DRBD_META_IO_ERROR, |
| 1765 | DRBD_FORCE_DETACH, |
| 1766 | }; |
| 1767 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1768 | #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] | 1769 | static inline void __drbd_chk_io_error_(struct drbd_device *device, |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1770 | enum drbd_force_detach_flags df, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1771 | const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1772 | { |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1773 | enum drbd_io_error_p ep; |
| 1774 | |
| 1775 | rcu_read_lock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1776 | ep = rcu_dereference(device->ldev->disk_conf)->on_io_error; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1777 | rcu_read_unlock(); |
| 1778 | switch (ep) { |
| 1779 | case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */ |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1780 | if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) { |
Lars Ellenberg | 7383506 | 2010-05-27 11:51:56 +0200 | [diff] [blame] | 1781 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1782 | drbd_err(device, "Local IO failed in %s.\n", where); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1783 | if (device->state.disk > D_INCONSISTENT) |
| 1784 | _drbd_set_state(_NS(device, disk, D_INCONSISTENT), CS_HARD, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1785 | break; |
| 1786 | } |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1787 | /* NOTE fall through for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1788 | case EP_DETACH: |
| 1789 | case EP_CALL_HELPER: |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1790 | /* Remember whether we saw a READ or WRITE error. |
| 1791 | * |
| 1792 | * Recovery of the affected area for WRITE failure is covered |
| 1793 | * by the activity log. |
| 1794 | * READ errors may fall outside that area though. Certain READ |
| 1795 | * errors can be "healed" by writing good data to the affected |
| 1796 | * blocks, which triggers block re-allocation in lower layers. |
| 1797 | * |
| 1798 | * If we can not write the bitmap after a READ error, |
| 1799 | * we may need to trigger a full sync (see w_go_diskless()). |
| 1800 | * |
| 1801 | * Force-detach is not really an IO error, but rather a |
| 1802 | * desperate measure to try to deal with a completely |
| 1803 | * unresponsive lower level IO stack. |
| 1804 | * Still it should be treated as a WRITE error. |
| 1805 | * |
| 1806 | * Meta IO error is always WRITE error: |
| 1807 | * we read meta data only once during attach, |
| 1808 | * which will fail in case of errors. |
| 1809 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1810 | set_bit(WAS_IO_ERROR, &device->flags); |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1811 | if (df == DRBD_READ_ERROR) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1812 | set_bit(WAS_READ_ERROR, &device->flags); |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1813 | if (df == DRBD_FORCE_DETACH) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1814 | set_bit(FORCE_DETACH, &device->flags); |
| 1815 | if (device->state.disk > D_FAILED) { |
| 1816 | _drbd_set_state(_NS(device, disk, D_FAILED), CS_HARD, NULL); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1817 | drbd_err(device, |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1818 | "Local IO failed in %s. Detaching...\n", where); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1819 | } |
| 1820 | break; |
| 1821 | } |
| 1822 | } |
| 1823 | |
| 1824 | /** |
| 1825 | * 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] | 1826 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1827 | * @error: Error code passed to the IO completion callback |
| 1828 | * @forcedetach: Force detach. I.e. the error happened while accessing the meta data |
| 1829 | * |
| 1830 | * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED) |
| 1831 | */ |
| 1832 | #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] | 1833 | static inline void drbd_chk_io_error_(struct drbd_device *device, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1834 | int error, enum drbd_force_detach_flags forcedetach, const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1835 | { |
| 1836 | if (error) { |
| 1837 | unsigned long flags; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1838 | spin_lock_irqsave(&device->resource->req_lock, flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1839 | __drbd_chk_io_error_(device, forcedetach, where); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1840 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1841 | } |
| 1842 | } |
| 1843 | |
| 1844 | |
| 1845 | /** |
| 1846 | * drbd_md_first_sector() - Returns the first sector number of the meta data area |
| 1847 | * @bdev: Meta data block device. |
| 1848 | * |
| 1849 | * BTW, for internal meta data, this happens to be the maximum capacity |
| 1850 | * we could agree upon with our peer node. |
| 1851 | */ |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1852 | 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] | 1853 | { |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1854 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1855 | case DRBD_MD_INDEX_INTERNAL: |
| 1856 | case DRBD_MD_INDEX_FLEX_INT: |
| 1857 | return bdev->md.md_offset + bdev->md.bm_offset; |
| 1858 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1859 | default: |
| 1860 | return bdev->md.md_offset; |
| 1861 | } |
| 1862 | } |
| 1863 | |
| 1864 | /** |
| 1865 | * drbd_md_last_sector() - Return the last sector number of the meta data area |
| 1866 | * @bdev: Meta data block device. |
| 1867 | */ |
| 1868 | static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev) |
| 1869 | { |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1870 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1871 | case DRBD_MD_INDEX_INTERNAL: |
| 1872 | case DRBD_MD_INDEX_FLEX_INT: |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1873 | return bdev->md.md_offset + MD_4kB_SECT -1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1874 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1875 | default: |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1876 | return bdev->md.md_offset + bdev->md.md_size_sect -1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1877 | } |
| 1878 | } |
| 1879 | |
| 1880 | /* Returns the number of 512 byte sectors of the device */ |
| 1881 | static inline sector_t drbd_get_capacity(struct block_device *bdev) |
| 1882 | { |
| 1883 | /* return bdev ? get_capacity(bdev->bd_disk) : 0; */ |
Mike Snitzer | 77304d2 | 2010-11-08 14:39:12 +0100 | [diff] [blame] | 1884 | return bdev ? i_size_read(bdev->bd_inode) >> 9 : 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1885 | } |
| 1886 | |
| 1887 | /** |
| 1888 | * drbd_get_max_capacity() - Returns the capacity we announce to out peer |
| 1889 | * @bdev: Meta data block device. |
| 1890 | * |
| 1891 | * returns the capacity we announce to out peer. we clip ourselves at the |
| 1892 | * various MAX_SECTORS, because if we don't, current implementation will |
| 1893 | * oops sooner or later |
| 1894 | */ |
| 1895 | static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) |
| 1896 | { |
| 1897 | sector_t s; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1898 | |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1899 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1900 | case DRBD_MD_INDEX_INTERNAL: |
| 1901 | case DRBD_MD_INDEX_FLEX_INT: |
| 1902 | s = drbd_get_capacity(bdev->backing_bdev) |
| 1903 | ? min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1904 | drbd_md_first_sector(bdev)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1905 | : 0; |
| 1906 | break; |
| 1907 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1908 | s = min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
| 1909 | drbd_get_capacity(bdev->backing_bdev)); |
| 1910 | /* clip at maximum size the meta device can support */ |
| 1911 | s = min_t(sector_t, s, |
| 1912 | BM_EXT_TO_SECT(bdev->md.md_size_sect |
| 1913 | - bdev->md.bm_offset)); |
| 1914 | break; |
| 1915 | default: |
| 1916 | s = min_t(sector_t, DRBD_MAX_SECTORS, |
| 1917 | drbd_get_capacity(bdev->backing_bdev)); |
| 1918 | } |
| 1919 | return s; |
| 1920 | } |
| 1921 | |
| 1922 | /** |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1923 | * 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] | 1924 | * @bdev: Meta data block device. |
| 1925 | */ |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1926 | static inline sector_t drbd_md_ss(struct drbd_backing_dev *bdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1927 | { |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1928 | const int meta_dev_idx = bdev->md.meta_dev_idx; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1929 | |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1930 | if (meta_dev_idx == DRBD_MD_INDEX_FLEX_EXT) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1931 | return 0; |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1932 | |
| 1933 | /* Since drbd08, internal meta data is always "flexible". |
| 1934 | * position: last 4k aligned block of 4k size */ |
| 1935 | if (meta_dev_idx == DRBD_MD_INDEX_INTERNAL || |
| 1936 | meta_dev_idx == DRBD_MD_INDEX_FLEX_INT) |
| 1937 | return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) - 8; |
| 1938 | |
| 1939 | /* external, some index; this is the old fixed size layout */ |
| 1940 | return MD_128MB_SECT * bdev->md.meta_dev_idx; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1941 | } |
| 1942 | |
| 1943 | static inline void |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1944 | drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) |
| 1945 | { |
| 1946 | unsigned long flags; |
| 1947 | spin_lock_irqsave(&q->q_lock, flags); |
| 1948 | list_add_tail(&w->list, &q->q); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1949 | spin_unlock_irqrestore(&q->q_lock, flags); |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1950 | wake_up(&q->q_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1951 | } |
| 1952 | |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 1953 | static inline void |
Lars Ellenberg | 15e26f6 | 2014-04-28 11:43:21 +0200 | [diff] [blame] | 1954 | drbd_queue_work_if_unqueued(struct drbd_work_queue *q, struct drbd_work *w) |
| 1955 | { |
| 1956 | unsigned long flags; |
| 1957 | spin_lock_irqsave(&q->q_lock, flags); |
| 1958 | if (list_empty_careful(&w->list)) |
| 1959 | list_add_tail(&w->list, &q->q); |
| 1960 | spin_unlock_irqrestore(&q->q_lock, flags); |
| 1961 | wake_up(&q->q_wait); |
| 1962 | } |
| 1963 | |
| 1964 | static inline void |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 1965 | drbd_device_post_work(struct drbd_device *device, int work_bit) |
| 1966 | { |
| 1967 | if (!test_and_set_bit(work_bit, &device->flags)) { |
| 1968 | struct drbd_connection *connection = |
| 1969 | first_peer_device(device)->connection; |
| 1970 | struct drbd_work_queue *q = &connection->sender_work; |
| 1971 | if (!test_and_set_bit(DEVICE_WORK_PENDING, &connection->flags)) |
| 1972 | wake_up(&q->q_wait); |
| 1973 | } |
| 1974 | } |
| 1975 | |
Andreas Gruenbacher | b5043c5 | 2011-07-28 15:56:02 +0200 | [diff] [blame] | 1976 | extern void drbd_flush_workqueue(struct drbd_work_queue *work_queue); |
| 1977 | |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1978 | /* To get the ack_receiver out of the blocking network stack, |
| 1979 | * so it can change its sk_rcvtimeo from idle- to ping-timeout, |
| 1980 | * and send a ping, we need to send a signal. |
| 1981 | * Which signal we send is irrelevant. */ |
| 1982 | static inline void wake_ack_receiver(struct drbd_connection *connection) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1983 | { |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1984 | struct task_struct *task = connection->ack_receiver.task; |
| 1985 | if (task && get_t_state(&connection->ack_receiver) == RUNNING) |
| 1986 | force_sig(SIGXCPU, task); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1987 | } |
| 1988 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1989 | static inline void request_ping(struct drbd_connection *connection) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1990 | { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1991 | set_bit(SEND_PING, &connection->flags); |
Philipp Reisner | 668700b | 2015-03-16 16:08:29 +0100 | [diff] [blame] | 1992 | wake_ack_receiver(connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1993 | } |
| 1994 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1995 | extern void *conn_prepare_command(struct drbd_connection *, struct drbd_socket *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1996 | extern void *drbd_prepare_command(struct drbd_peer_device *, struct drbd_socket *); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1997 | extern int conn_send_command(struct drbd_connection *, struct drbd_socket *, |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 1998 | enum drbd_packet, unsigned int, void *, |
| 1999 | unsigned int); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 2000 | extern int drbd_send_command(struct drbd_peer_device *, struct drbd_socket *, |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 2001 | enum drbd_packet, unsigned int, void *, |
| 2002 | unsigned int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2003 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 2004 | extern int drbd_send_ping(struct drbd_connection *connection); |
| 2005 | extern int drbd_send_ping_ack(struct drbd_connection *connection); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 2006 | 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] | 2007 | 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] | 2008 | |
| 2009 | static inline void drbd_thread_stop(struct drbd_thread *thi) |
| 2010 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 2011 | _drbd_thread_stop(thi, false, true); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2012 | } |
| 2013 | |
| 2014 | static inline void drbd_thread_stop_nowait(struct drbd_thread *thi) |
| 2015 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 2016 | _drbd_thread_stop(thi, false, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2017 | } |
| 2018 | |
| 2019 | static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) |
| 2020 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 2021 | _drbd_thread_stop(thi, true, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2022 | } |
| 2023 | |
| 2024 | /* counts how many answer packets packets we expect from our peer, |
| 2025 | * for either explicit application requests, |
| 2026 | * or implicit barrier packets as necessary. |
| 2027 | * increased: |
| 2028 | * w_send_barrier |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 2029 | * _req_mod(req, QUEUE_FOR_NET_WRITE or QUEUE_FOR_NET_READ); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2030 | * it is much easier and equally valid to count what we queue for the |
| 2031 | * worker, even before it actually was queued or send. |
| 2032 | * (drbd_make_request_common; recovery path on read io-error) |
| 2033 | * decreased: |
| 2034 | * got_BarrierAck (respective tl_clear, tl_clear_barrier) |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 2035 | * _req_mod(req, DATA_RECEIVED) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2036 | * [from receive_DataReply] |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 2037 | * _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] | 2038 | * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)] |
| 2039 | * for some reason it is NOT decreased in got_NegAck, |
| 2040 | * but in the resulting cleanup code from report_params. |
| 2041 | * we should try to remember the reason for that... |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 2042 | * _req_mod(req, SEND_FAILED or SEND_CANCELED) |
| 2043 | * _req_mod(req, CONNECTION_LOST_WHILE_PENDING) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2044 | * [from tl_clear_barrier] |
| 2045 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2046 | static inline void inc_ap_pending(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2047 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2048 | atomic_inc(&device->ap_pending_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2049 | } |
| 2050 | |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2051 | #define ERR_IF_CNT_IS_NEGATIVE(which, func, line) \ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2052 | if (atomic_read(&device->which) < 0) \ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 2053 | drbd_err(device, "in %s:%d: " #which " = %d < 0 !\n", \ |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2054 | func, line, \ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2055 | atomic_read(&device->which)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2056 | |
Joe Perches | 659b2e3 | 2014-03-25 12:35:05 -0700 | [diff] [blame] | 2057 | #define dec_ap_pending(device) _dec_ap_pending(device, __func__, __LINE__) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2058 | static inline void _dec_ap_pending(struct drbd_device *device, const char *func, int line) |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2059 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2060 | if (atomic_dec_and_test(&device->ap_pending_cnt)) |
| 2061 | wake_up(&device->misc_wait); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2062 | ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt, func, line); |
| 2063 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2064 | |
| 2065 | /* counts how many resync-related answers we still expect from the peer |
| 2066 | * increase decrease |
| 2067 | * 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] | 2068 | * 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] | 2069 | * (or P_NEG_ACK with ID_SYNCER) |
| 2070 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2071 | static inline void inc_rs_pending(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2072 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2073 | atomic_inc(&device->rs_pending_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2074 | } |
| 2075 | |
Joe Perches | 659b2e3 | 2014-03-25 12:35:05 -0700 | [diff] [blame] | 2076 | #define dec_rs_pending(device) _dec_rs_pending(device, __func__, __LINE__) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2077 | static inline void _dec_rs_pending(struct drbd_device *device, const char *func, int line) |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2078 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2079 | atomic_dec(&device->rs_pending_cnt); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2080 | ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt, func, line); |
| 2081 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2082 | |
| 2083 | /* counts how many answers we still need to send to the peer. |
| 2084 | * increased on |
| 2085 | * receive_Data unless protocol A; |
| 2086 | * we need to send a P_RECV_ACK (proto B) |
| 2087 | * or P_WRITE_ACK (proto C) |
| 2088 | * receive_RSDataReply (recv_resync_read) we need to send a P_WRITE_ACK |
| 2089 | * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA |
| 2090 | * receive_Barrier_* we need to send a P_BARRIER_ACK |
| 2091 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2092 | static inline void inc_unacked(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2093 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2094 | atomic_inc(&device->unacked_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2095 | } |
| 2096 | |
Joe Perches | 659b2e3 | 2014-03-25 12:35:05 -0700 | [diff] [blame] | 2097 | #define dec_unacked(device) _dec_unacked(device, __func__, __LINE__) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2098 | static inline void _dec_unacked(struct drbd_device *device, const char *func, int line) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2099 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2100 | atomic_dec(&device->unacked_cnt); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2101 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2102 | } |
| 2103 | |
Joe Perches | 659b2e3 | 2014-03-25 12:35:05 -0700 | [diff] [blame] | 2104 | #define sub_unacked(device, n) _sub_unacked(device, n, __func__, __LINE__) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2105 | static inline void _sub_unacked(struct drbd_device *device, int n, const char *func, int line) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2106 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2107 | atomic_sub(n, &device->unacked_cnt); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 2108 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2109 | } |
| 2110 | |
Lars Ellenberg | 5052fee | 2016-06-14 00:26:24 +0200 | [diff] [blame] | 2111 | static inline bool is_sync_target_state(enum drbd_conns connection_state) |
| 2112 | { |
| 2113 | return connection_state == C_SYNC_TARGET || |
| 2114 | connection_state == C_PAUSED_SYNC_T; |
| 2115 | } |
| 2116 | |
| 2117 | static inline bool is_sync_source_state(enum drbd_conns connection_state) |
| 2118 | { |
| 2119 | return connection_state == C_SYNC_SOURCE || |
| 2120 | connection_state == C_PAUSED_SYNC_S; |
| 2121 | } |
| 2122 | |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 2123 | static inline bool is_sync_state(enum drbd_conns connection_state) |
| 2124 | { |
Lars Ellenberg | 5052fee | 2016-06-14 00:26:24 +0200 | [diff] [blame] | 2125 | return is_sync_source_state(connection_state) || |
| 2126 | is_sync_target_state(connection_state); |
Lars Ellenberg | 5ab7d2c | 2014-01-27 15:58:22 +0100 | [diff] [blame] | 2127 | } |
| 2128 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2129 | /** |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2130 | * 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] | 2131 | * @_device: DRBD device. |
| 2132 | * @_min_state: Minimum device state required for success. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2133 | * |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2134 | * You have to call put_ldev() when finished working with device->ldev. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2135 | */ |
Andreas Gruenbacher | d1b8085 | 2014-09-11 14:29:09 +0200 | [diff] [blame] | 2136 | #define get_ldev_if_state(_device, _min_state) \ |
| 2137 | (_get_ldev_if_state((_device), (_min_state)) ? \ |
| 2138 | ({ __acquire(x); true; }) : false) |
| 2139 | #define get_ldev(_device) get_ldev_if_state(_device, D_INCONSISTENT) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2140 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2141 | static inline void put_ldev(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2142 | { |
Andreas Gruenbacher | 11f8b2b | 2014-09-11 14:29:05 +0200 | [diff] [blame] | 2143 | enum drbd_disk_state disk_state = device->state.disk; |
Lars Ellenberg | ba3c6fb | 2014-02-11 08:57:18 +0100 | [diff] [blame] | 2144 | /* We must check the state *before* the atomic_dec becomes visible, |
| 2145 | * or we have a theoretical race where someone hitting zero, |
| 2146 | * while state still D_FAILED, will then see D_DISKLESS in the |
| 2147 | * condition below and calling into destroy, where he must not, yet. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2148 | int i = atomic_dec_return(&device->local_cnt); |
Lars Ellenberg | 9a0d9d0 | 2011-05-02 11:51:31 +0200 | [diff] [blame] | 2149 | |
| 2150 | /* This may be called from some endio handler, |
| 2151 | * so we must not sleep here. */ |
| 2152 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2153 | __release(local); |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 2154 | D_ASSERT(device, i >= 0); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2155 | if (i == 0) { |
Andreas Gruenbacher | 11f8b2b | 2014-09-11 14:29:05 +0200 | [diff] [blame] | 2156 | if (disk_state == D_DISKLESS) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2157 | /* even internal references gone, safe to destroy */ |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 2158 | drbd_device_post_work(device, DESTROY_DISK); |
Andreas Gruenbacher | 11f8b2b | 2014-09-11 14:29:05 +0200 | [diff] [blame] | 2159 | if (disk_state == D_FAILED) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2160 | /* all application IO references gone. */ |
Lars Ellenberg | e334f55 | 2014-02-11 09:30:49 +0100 | [diff] [blame] | 2161 | if (!test_and_set_bit(GOING_DISKLESS, &device->flags)) |
| 2162 | drbd_device_post_work(device, GO_DISKLESS); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2163 | wake_up(&device->misc_wait); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 2164 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2165 | } |
| 2166 | |
| 2167 | #ifndef __CHECKER__ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2168 | 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] | 2169 | { |
| 2170 | int io_allowed; |
| 2171 | |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2172 | /* never get a reference while D_DISKLESS */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2173 | if (device->state.disk == D_DISKLESS) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 2174 | return 0; |
| 2175 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2176 | atomic_inc(&device->local_cnt); |
| 2177 | io_allowed = (device->state.disk >= mins); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2178 | if (!io_allowed) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2179 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2180 | return io_allowed; |
| 2181 | } |
| 2182 | #else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2183 | 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] | 2184 | #endif |
| 2185 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2186 | /* this throttles on-the-fly application requests |
| 2187 | * according to max_buffers settings; |
| 2188 | * maybe re-implement using semaphores? */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2189 | static inline int drbd_get_max_buffers(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2190 | { |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 2191 | struct net_conf *nc; |
| 2192 | int mxb; |
| 2193 | |
| 2194 | rcu_read_lock(); |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 2195 | nc = rcu_dereference(first_peer_device(device)->connection->net_conf); |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 2196 | mxb = nc ? nc->max_buffers : 1000000; /* arbitrary limit on open requests */ |
| 2197 | rcu_read_unlock(); |
| 2198 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2199 | return mxb; |
| 2200 | } |
| 2201 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2202 | static inline int drbd_state_is_stable(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2203 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2204 | union drbd_dev_state s = device->state; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2205 | |
| 2206 | /* DO NOT add a default clause, we want the compiler to warn us |
| 2207 | * for any newly introduced state we may have forgotten to add here */ |
| 2208 | |
| 2209 | switch ((enum drbd_conns)s.conn) { |
| 2210 | /* new io only accepted when there is no connection, ... */ |
| 2211 | case C_STANDALONE: |
| 2212 | case C_WF_CONNECTION: |
| 2213 | /* ... or there is a well established connection. */ |
| 2214 | case C_CONNECTED: |
| 2215 | case C_SYNC_SOURCE: |
| 2216 | case C_SYNC_TARGET: |
| 2217 | case C_VERIFY_S: |
| 2218 | case C_VERIFY_T: |
| 2219 | case C_PAUSED_SYNC_S: |
| 2220 | case C_PAUSED_SYNC_T: |
Philipp Reisner | 6753171 | 2010-10-27 12:21:30 +0200 | [diff] [blame] | 2221 | case C_AHEAD: |
| 2222 | case C_BEHIND: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2223 | /* transitional states, IO allowed */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2224 | case C_DISCONNECTING: |
| 2225 | case C_UNCONNECTED: |
| 2226 | case C_TIMEOUT: |
| 2227 | case C_BROKEN_PIPE: |
| 2228 | case C_NETWORK_FAILURE: |
| 2229 | case C_PROTOCOL_ERROR: |
| 2230 | case C_TEAR_DOWN: |
| 2231 | case C_WF_REPORT_PARAMS: |
| 2232 | case C_STARTING_SYNC_S: |
| 2233 | case C_STARTING_SYNC_T: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2234 | break; |
| 2235 | |
| 2236 | /* Allow IO in BM exchange states with new protocols */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2237 | case C_WF_BITMAP_S: |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 2238 | if (first_peer_device(device)->connection->agreed_pro_version < 96) |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 2239 | return 0; |
| 2240 | break; |
| 2241 | |
| 2242 | /* no new io accepted in these states */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2243 | case C_WF_BITMAP_T: |
| 2244 | case C_WF_SYNC_UUID: |
| 2245 | case C_MASK: |
| 2246 | /* not "stable" */ |
| 2247 | return 0; |
| 2248 | } |
| 2249 | |
| 2250 | switch ((enum drbd_disk_state)s.disk) { |
| 2251 | case D_DISKLESS: |
| 2252 | case D_INCONSISTENT: |
| 2253 | case D_OUTDATED: |
| 2254 | case D_CONSISTENT: |
| 2255 | case D_UP_TO_DATE: |
Philipp Reisner | 5ca1de0 | 2011-06-28 17:01:19 +0200 | [diff] [blame] | 2256 | case D_FAILED: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2257 | /* disk state is stable as well. */ |
| 2258 | break; |
| 2259 | |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 2260 | /* no new io accepted during transitional states */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2261 | case D_ATTACHING: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2262 | case D_NEGOTIATING: |
| 2263 | case D_UNKNOWN: |
| 2264 | case D_MASK: |
| 2265 | /* not "stable" */ |
| 2266 | return 0; |
| 2267 | } |
| 2268 | |
| 2269 | return 1; |
| 2270 | } |
| 2271 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2272 | static inline int drbd_suspended(struct drbd_device *device) |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2273 | { |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 2274 | struct drbd_resource *resource = device->resource; |
Philipp Reisner | 8e0af25 | 2011-03-28 16:18:39 +0200 | [diff] [blame] | 2275 | |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 2276 | return resource->susp || resource->susp_fen || resource->susp_nod; |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2277 | } |
| 2278 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2279 | static inline bool may_inc_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2280 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2281 | int mxb = drbd_get_max_buffers(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2282 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2283 | if (drbd_suspended(device)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2284 | return false; |
Philipp Reisner | 7dbb438 | 2013-02-28 10:30:19 +0100 | [diff] [blame] | 2285 | if (atomic_read(&device->suspend_cnt)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2286 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2287 | |
| 2288 | /* to avoid potential deadlock or bitmap corruption, |
| 2289 | * in various places, we only allow new application io |
| 2290 | * to start during "stable" states. */ |
| 2291 | |
| 2292 | /* no new io accepted when attaching or detaching the disk */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2293 | if (!drbd_state_is_stable(device)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2294 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2295 | |
| 2296 | /* since some older kernels don't have atomic_add_unless, |
| 2297 | * and we are within the spinlock anyways, we have this workaround. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2298 | if (atomic_read(&device->ap_bio_cnt) > mxb) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2299 | return false; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2300 | if (test_bit(BITMAP_IO, &device->flags)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2301 | return false; |
| 2302 | return true; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2303 | } |
| 2304 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2305 | static inline bool inc_ap_bio_cond(struct drbd_device *device) |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2306 | { |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2307 | bool rv = false; |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2308 | |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 2309 | spin_lock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2310 | rv = may_inc_ap_bio(device); |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2311 | if (rv) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2312 | atomic_inc(&device->ap_bio_cnt); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 2313 | spin_unlock_irq(&device->resource->req_lock); |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2314 | |
| 2315 | return rv; |
| 2316 | } |
| 2317 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2318 | static inline void inc_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2319 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2320 | /* we wait here |
| 2321 | * as long as the device is suspended |
| 2322 | * until the bitmap is no longer on the fly during connection |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 2323 | * handshake as long as we would exceed the max_buffer limit. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2324 | * |
| 2325 | * to avoid races with the reconnect code, |
| 2326 | * we need to atomic_inc within the spinlock. */ |
| 2327 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2328 | wait_event(device->misc_wait, inc_ap_bio_cond(device)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2329 | } |
| 2330 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2331 | static inline void dec_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2332 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2333 | int mxb = drbd_get_max_buffers(device); |
| 2334 | int ap_bio = atomic_dec_return(&device->ap_bio_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2335 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 2336 | D_ASSERT(device, ap_bio >= 0); |
Lars Ellenberg | 7ee1fb9 | 2012-06-19 10:27:58 +0200 | [diff] [blame] | 2337 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2338 | if (ap_bio == 0 && test_bit(BITMAP_IO, &device->flags)) { |
| 2339 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags)) |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 2340 | drbd_queue_work(&first_peer_device(device)-> |
| 2341 | connection->sender_work, |
| 2342 | &device->bm_io_work.w); |
Lars Ellenberg | 7ee1fb9 | 2012-06-19 10:27:58 +0200 | [diff] [blame] | 2343 | } |
| 2344 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2345 | /* this currently does wake_up for every dec_ap_bio! |
| 2346 | * maybe rather introduce some type of hysteresis? |
| 2347 | * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ |
| 2348 | if (ap_bio < mxb) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2349 | wake_up(&device->misc_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2350 | } |
| 2351 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2352 | static inline bool verify_can_do_stop_sector(struct drbd_device *device) |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 2353 | { |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 2354 | return first_peer_device(device)->connection->agreed_pro_version >= 97 && |
| 2355 | first_peer_device(device)->connection->agreed_pro_version != 100; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 2356 | } |
| 2357 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2358 | 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] | 2359 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2360 | int changed = device->ed_uuid != val; |
| 2361 | device->ed_uuid = val; |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 2362 | return changed; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2363 | } |
| 2364 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2365 | static inline int drbd_queue_order_type(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2366 | { |
| 2367 | /* sorry, we currently have no working implementation |
| 2368 | * of distributed TCQ stuff */ |
| 2369 | #ifndef QUEUE_ORDERED_NONE |
| 2370 | #define QUEUE_ORDERED_NONE 0 |
| 2371 | #endif |
| 2372 | return QUEUE_ORDERED_NONE; |
| 2373 | } |
| 2374 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 2375 | static inline struct drbd_connection *first_connection(struct drbd_resource *resource) |
| 2376 | { |
Lars Ellenberg | ec4a340 | 2014-04-28 18:43:35 +0200 | [diff] [blame] | 2377 | return list_first_entry_or_null(&resource->connections, |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 2378 | struct drbd_connection, connections); |
| 2379 | } |
| 2380 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2381 | #endif |