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 | |
| 29 | #include <linux/compiler.h> |
| 30 | #include <linux/types.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 31 | #include <linux/list.h> |
| 32 | #include <linux/sched.h> |
| 33 | #include <linux/bitops.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/crypto.h> |
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> |
| 41 | #include <linux/genhd.h> |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 42 | #include <linux/idr.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 43 | #include <net/tcp.h> |
| 44 | #include <linux/lru_cache.h> |
Paul Gortmaker | 70c7160 | 2011-05-22 16:47:17 -0400 | [diff] [blame] | 45 | #include <linux/prefetch.h> |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 46 | #include <linux/drbd_genl_api.h> |
Philipp Reisner | b890733 | 2011-01-27 14:07:51 +0100 | [diff] [blame] | 47 | #include <linux/drbd.h> |
Andreas Gruenbacher | d9f6522 | 2011-09-01 13:18:31 +0200 | [diff] [blame] | 48 | #include "drbd_strings.h" |
Philipp Reisner | b890733 | 2011-01-27 14:07:51 +0100 | [diff] [blame] | 49 | #include "drbd_state.h" |
Andreas Gruenbacher | a3603a6 | 2011-05-30 11:47:37 +0200 | [diff] [blame] | 50 | #include "drbd_protocol.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 51 | |
| 52 | #ifdef __CHECKER__ |
| 53 | # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr"))) |
| 54 | # define __protected_read_by(x) __attribute__((require_context(x,1,999,"read"))) |
| 55 | # define __protected_write_by(x) __attribute__((require_context(x,1,999,"write"))) |
| 56 | # define __must_hold(x) __attribute__((context(x,1,1), require_context(x,1,999,"call"))) |
| 57 | #else |
| 58 | # define __protected_by(x) |
| 59 | # define __protected_read_by(x) |
| 60 | # define __protected_write_by(x) |
| 61 | # define __must_hold(x) |
| 62 | #endif |
| 63 | |
| 64 | #define __no_warn(lock, stmt) do { __acquire(lock); stmt; __release(lock); } while (0) |
| 65 | |
| 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 | /* I don't remember why XCPU ... |
| 82 | * This is used to wake the asender, |
| 83 | * and to interrupt sending the sending task |
| 84 | * on disconnect. |
| 85 | */ |
| 86 | #define DRBD_SIG SIGXCPU |
| 87 | |
| 88 | /* This is used to stop/restart our threads. |
| 89 | * Cannot use SIGTERM nor SIGKILL, since these |
| 90 | * are sent out by init on runlevel changes |
| 91 | * I choose SIGHUP for now. |
| 92 | */ |
| 93 | #define DRBD_SIGKILL SIGHUP |
| 94 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 95 | #define ID_IN_SYNC (4711ULL) |
| 96 | #define ID_OUT_OF_SYNC (4712ULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 97 | #define ID_SYNCER (-1ULL) |
Andreas Gruenbacher | 579b57e | 2011-01-13 18:40:57 +0100 | [diff] [blame] | 98 | |
Philipp Reisner | 4a23f26 | 2011-01-11 17:42:17 +0100 | [diff] [blame] | 99 | #define UUID_NEW_BM_OFFSET ((u64)0x0001000000000000ULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 100 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 101 | struct drbd_device; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 102 | struct drbd_connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 103 | |
Andreas Gruenbacher | 3b52bef | 2011-07-06 10:57:39 +0200 | [diff] [blame] | 104 | #define __drbd_printk_device(level, device, fmt, args...) \ |
| 105 | dev_printk(level, disk_to_dev((device)->vdisk), fmt, ## args) |
| 106 | #define __drbd_printk_peer_device(level, peer_device, fmt, args...) \ |
| 107 | dev_printk(level, disk_to_dev((peer_device)->device->vdisk), fmt, ## args) |
| 108 | #define __drbd_printk_resource(level, resource, fmt, args...) \ |
| 109 | printk(level "drbd %s: " fmt, (resource)->name, ## args) |
| 110 | #define __drbd_printk_connection(level, connection, fmt, args...) \ |
| 111 | printk(level "drbd %s: " fmt, (connection)->resource->name, ## args) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 112 | |
Andreas Gruenbacher | 3b52bef | 2011-07-06 10:57:39 +0200 | [diff] [blame] | 113 | void drbd_printk_with_wrong_object_type(void); |
| 114 | |
| 115 | #define __drbd_printk_if_same_type(obj, type, func, level, fmt, args...) \ |
| 116 | (__builtin_types_compatible_p(typeof(obj), type) || \ |
| 117 | __builtin_types_compatible_p(typeof(obj), const type)), \ |
| 118 | func(level, (const type)(obj), fmt, ## args) |
| 119 | |
| 120 | #define drbd_printk(level, obj, fmt, args...) \ |
| 121 | __builtin_choose_expr( \ |
| 122 | __drbd_printk_if_same_type(obj, struct drbd_device *, \ |
| 123 | __drbd_printk_device, level, fmt, ## args), \ |
| 124 | __builtin_choose_expr( \ |
| 125 | __drbd_printk_if_same_type(obj, struct drbd_resource *, \ |
| 126 | __drbd_printk_resource, level, fmt, ## args), \ |
| 127 | __builtin_choose_expr( \ |
| 128 | __drbd_printk_if_same_type(obj, struct drbd_connection *, \ |
| 129 | __drbd_printk_connection, level, fmt, ## args), \ |
| 130 | __builtin_choose_expr( \ |
| 131 | __drbd_printk_if_same_type(obj, struct drbd_peer_device *, \ |
| 132 | __drbd_printk_peer_device, level, fmt, ## args), \ |
| 133 | drbd_printk_with_wrong_object_type())))) |
| 134 | |
| 135 | #define drbd_dbg(obj, fmt, args...) \ |
| 136 | drbd_printk(KERN_DEBUG, obj, fmt, ## args) |
| 137 | #define drbd_alert(obj, fmt, args...) \ |
| 138 | drbd_printk(KERN_ALERT, obj, fmt, ## args) |
| 139 | #define drbd_err(obj, fmt, args...) \ |
| 140 | drbd_printk(KERN_ERR, obj, fmt, ## args) |
| 141 | #define drbd_warn(obj, fmt, args...) \ |
| 142 | drbd_printk(KERN_WARNING, obj, fmt, ## args) |
| 143 | #define drbd_info(obj, fmt, args...) \ |
| 144 | drbd_printk(KERN_INFO, obj, fmt, ## args) |
| 145 | #define drbd_emerg(obj, fmt, args...) \ |
| 146 | drbd_printk(KERN_EMERG, obj, fmt, ## args) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 147 | |
| 148 | #define dynamic_drbd_dbg(device, fmt, args...) \ |
| 149 | dynamic_dev_dbg(disk_to_dev(device->vdisk), fmt, ## args) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 150 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 151 | #define D_ASSERT(device, exp) do { \ |
| 152 | if (!(exp)) \ |
| 153 | drbd_err(device, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__); \ |
| 154 | } while (0) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 155 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 156 | /** |
| 157 | * expect - Make an assertion |
| 158 | * |
| 159 | * Unlike the assert macro, this macro returns a boolean result. |
| 160 | */ |
| 161 | #define expect(exp) ({ \ |
| 162 | bool _bool = (exp); \ |
| 163 | if (!_bool) \ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 164 | drbd_err(device, "ASSERTION %s FAILED in %s\n", \ |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 165 | #exp, __func__); \ |
| 166 | _bool; \ |
| 167 | }) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 168 | |
| 169 | /* Defines to control fault insertion */ |
| 170 | enum { |
| 171 | DRBD_FAULT_MD_WR = 0, /* meta data write */ |
| 172 | DRBD_FAULT_MD_RD = 1, /* read */ |
| 173 | DRBD_FAULT_RS_WR = 2, /* resync */ |
| 174 | DRBD_FAULT_RS_RD = 3, |
| 175 | DRBD_FAULT_DT_WR = 4, /* data */ |
| 176 | DRBD_FAULT_DT_RD = 5, |
| 177 | DRBD_FAULT_DT_RA = 6, /* data read ahead */ |
| 178 | DRBD_FAULT_BM_ALLOC = 7, /* bitmap allocation */ |
| 179 | DRBD_FAULT_AL_EE = 8, /* alloc ee */ |
Philipp Reisner | 6b4388a | 2010-04-26 14:11:45 +0200 | [diff] [blame] | 180 | 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] | 181 | |
| 182 | DRBD_FAULT_MAX, |
| 183 | }; |
| 184 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 185 | extern unsigned int |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 186 | _drbd_insert_fault(struct drbd_device *device, unsigned int type); |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 187 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 188 | static inline int |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 189 | drbd_insert_fault(struct drbd_device *device, unsigned int type) { |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 190 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 191 | return fault_rate && |
| 192 | (enable_faults & (1<<type)) && |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 193 | _drbd_insert_fault(device, type); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 194 | #else |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 195 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 196 | #endif |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 197 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 198 | |
| 199 | /* integer division, round _UP_ to the next integer */ |
| 200 | #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0)) |
| 201 | /* usual integer division */ |
| 202 | #define div_floor(A, B) ((A)/(B)) |
| 203 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 204 | extern struct ratelimit_state drbd_ratelimit_state; |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 205 | extern struct idr drbd_devices; /* RCU, updates: genl_lock() */ |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 206 | extern struct list_head drbd_resources; /* RCU, updates: genl_lock() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 207 | |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 208 | extern const char *cmdname(enum drbd_packet cmd); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 209 | |
| 210 | /* for sending/receiving the bitmap, |
| 211 | * possibly in some encoding scheme */ |
| 212 | struct bm_xfer_ctx { |
| 213 | /* "const" |
| 214 | * stores total bits and long words |
| 215 | * of the bitmap, so we don't need to |
| 216 | * call the accessor functions over and again. */ |
| 217 | unsigned long bm_bits; |
| 218 | unsigned long bm_words; |
| 219 | /* during xfer, current position within the bitmap */ |
| 220 | unsigned long bit_offset; |
| 221 | unsigned long word_offset; |
| 222 | |
| 223 | /* statistics; index: (h->command == P_BITMAP) */ |
| 224 | unsigned packets[2]; |
| 225 | unsigned bytes[2]; |
| 226 | }; |
| 227 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 228 | extern void INFO_bm_xfer_stats(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 229 | const char *direction, struct bm_xfer_ctx *c); |
| 230 | |
| 231 | static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) |
| 232 | { |
| 233 | /* word_offset counts "native long words" (32 or 64 bit), |
| 234 | * aligned at 64 bit. |
| 235 | * Encoded packet may end at an unaligned bit offset. |
| 236 | * In case a fallback clear text packet is transmitted in |
| 237 | * between, we adjust this offset back to the last 64bit |
| 238 | * aligned "native long word", which makes coding and decoding |
| 239 | * the plain text bitmap much more convenient. */ |
| 240 | #if BITS_PER_LONG == 64 |
| 241 | c->word_offset = c->bit_offset >> 6; |
| 242 | #elif BITS_PER_LONG == 32 |
| 243 | c->word_offset = c->bit_offset >> 5; |
| 244 | c->word_offset &= ~(1UL); |
| 245 | #else |
| 246 | # error "unsupported BITS_PER_LONG" |
| 247 | #endif |
| 248 | } |
| 249 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 250 | extern unsigned int drbd_header_size(struct drbd_connection *connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 251 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 252 | /**********************************************************************/ |
| 253 | enum drbd_thread_state { |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 254 | NONE, |
| 255 | RUNNING, |
| 256 | EXITING, |
| 257 | RESTARTING |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 258 | }; |
| 259 | |
| 260 | struct drbd_thread { |
| 261 | spinlock_t t_lock; |
| 262 | struct task_struct *task; |
| 263 | struct completion stop; |
| 264 | enum drbd_thread_state t_state; |
| 265 | int (*function) (struct drbd_thread *); |
Andreas Gruenbacher | 2457b6d | 2011-07-21 13:45:21 +0200 | [diff] [blame] | 266 | struct drbd_resource *resource; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 267 | struct drbd_connection *connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 268 | int reset_cpu_mask; |
Andreas Gruenbacher | c60b025 | 2011-08-10 15:05:02 +0200 | [diff] [blame] | 269 | const char *name; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 270 | }; |
| 271 | |
| 272 | static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) |
| 273 | { |
| 274 | /* THINK testing the t_state seems to be uncritical in all cases |
| 275 | * (but thread_{start,stop}), so we can read it *without* the lock. |
| 276 | * --lge */ |
| 277 | |
| 278 | smp_rmb(); |
| 279 | return thi->t_state; |
| 280 | } |
| 281 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 282 | struct drbd_work { |
| 283 | struct list_head list; |
Andreas Gruenbacher | 309a834 | 2010-12-21 12:38:39 +0100 | [diff] [blame] | 284 | int (*cb)(struct drbd_work *, int cancel); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 285 | }; |
| 286 | |
| 287 | struct drbd_device_work { |
| 288 | struct drbd_work w; |
| 289 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 290 | }; |
| 291 | |
Andreas Gruenbacher | ace652a | 2011-01-03 17:09:58 +0100 | [diff] [blame] | 292 | #include "drbd_interval.h" |
| 293 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 294 | extern int drbd_wait_misc(struct drbd_device *, struct drbd_interval *); |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 295 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 296 | struct drbd_request { |
| 297 | struct drbd_work w; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 298 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 299 | |
| 300 | /* if local IO is not allowed, will be NULL. |
| 301 | * if local IO _is_ allowed, holds the locally submitted bio clone, |
| 302 | * or, after local IO completion, the ERR_PTR(error). |
Andreas Gruenbacher | fcefa62 | 2011-02-17 16:46:59 +0100 | [diff] [blame] | 303 | * see drbd_request_endio(). */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 304 | struct bio *private_bio; |
| 305 | |
Andreas Gruenbacher | ace652a | 2011-01-03 17:09:58 +0100 | [diff] [blame] | 306 | struct drbd_interval i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 307 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 308 | /* epoch: used to check on "completion" whether this req was in |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 309 | * the current epoch, and we therefore have to close it, |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 310 | * causing a p_barrier packet to be send, starting a new epoch. |
| 311 | * |
| 312 | * This corresponds to "barrier" in struct p_barrier[_ack], |
| 313 | * and to "barrier_nr" in struct drbd_epoch (and various |
| 314 | * comments/function parameters/local variable names). |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 315 | */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 316 | unsigned int epoch; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 317 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 318 | struct list_head tl_requests; /* ring list in the transfer log */ |
| 319 | struct bio *master_bio; /* master bio pointer */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 320 | unsigned long start_time; |
Lars Ellenberg | b406777 | 2012-01-24 16:58:11 +0100 | [diff] [blame] | 321 | |
| 322 | /* once it hits 0, we may complete the master_bio */ |
| 323 | atomic_t completion_ref; |
| 324 | /* once it hits 0, we may destroy this drbd_request object */ |
| 325 | struct kref kref; |
Lars Ellenberg | a0d856d | 2012-01-24 17:19:42 +0100 | [diff] [blame] | 326 | |
| 327 | unsigned rq_state; /* see comments above _req_mod() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 328 | }; |
| 329 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 330 | struct drbd_epoch { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 331 | struct drbd_connection *connection; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 332 | struct list_head list; |
| 333 | unsigned int barrier_nr; |
| 334 | atomic_t epoch_size; /* increased on every request added. */ |
| 335 | atomic_t active; /* increased on every req. added, and dec on every finished. */ |
| 336 | unsigned long flags; |
| 337 | }; |
| 338 | |
Rashika Kheria | de0b2e6 | 2013-12-19 15:07:47 +0530 | [diff] [blame] | 339 | /* Prototype declaration of function defined in drbd_receiver.c */ |
| 340 | int drbdd_init(struct drbd_thread *); |
| 341 | int drbd_asender(struct drbd_thread *); |
| 342 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 343 | /* drbd_epoch flag bits */ |
| 344 | enum { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 345 | DE_HAVE_BARRIER_NUMBER, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 346 | }; |
| 347 | |
| 348 | enum epoch_event { |
| 349 | EV_PUT, |
| 350 | EV_GOT_BARRIER_NR, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 351 | EV_BECAME_LAST, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 352 | EV_CLEANUP = 32, /* used as flag */ |
| 353 | }; |
| 354 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 355 | struct digest_info { |
| 356 | int digest_size; |
| 357 | void *digest; |
| 358 | }; |
| 359 | |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 360 | struct drbd_peer_request { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 361 | struct drbd_work w; |
| 362 | struct drbd_peer_device *peer_device; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 363 | struct drbd_epoch *epoch; /* for writes */ |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 364 | struct page *pages; |
| 365 | atomic_t pending_bios; |
Andreas Gruenbacher | 010f6e6 | 2011-01-14 20:59:35 +0100 | [diff] [blame] | 366 | struct drbd_interval i; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 367 | /* see comments on ee flag bits below */ |
| 368 | unsigned long flags; |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 369 | union { |
| 370 | u64 block_id; |
| 371 | struct digest_info *digest; |
| 372 | }; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 373 | }; |
| 374 | |
| 375 | /* ee flag bits. |
| 376 | * While corresponding bios are in flight, the only modification will be |
| 377 | * set_bit WAS_ERROR, which has to be atomic. |
| 378 | * If no bios are in flight yet, or all have been completed, |
| 379 | * non-atomic modification to ee->flags is ok. |
| 380 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 381 | enum { |
| 382 | __EE_CALL_AL_COMPLETE_IO, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 383 | __EE_MAY_SET_IN_SYNC, |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 384 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 385 | /* In case a barrier failed, |
| 386 | * we need to resubmit without the barrier flag. */ |
| 387 | __EE_RESUBMITTED, |
| 388 | |
Andreas Gruenbacher | 6c852be | 2011-02-04 15:38:52 +0100 | [diff] [blame] | 389 | /* we may have several bios per peer request. |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 390 | * if any of those fail, we set this flag atomically |
| 391 | * from the endio callback */ |
| 392 | __EE_WAS_ERROR, |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 393 | |
| 394 | /* This ee has a pointer to a digest instead of a block id */ |
| 395 | __EE_HAS_DIGEST, |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 396 | |
| 397 | /* Conflicting local requests need to be restarted after this request */ |
| 398 | __EE_RESTART_REQUESTS, |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 399 | |
| 400 | /* The peer wants a write ACK for this (wire proto C) */ |
| 401 | __EE_SEND_WRITE_ACK, |
Philipp Reisner | 302bdea | 2011-04-21 11:36:49 +0200 | [diff] [blame] | 402 | |
| 403 | /* Is set when net_conf had two_primaries set while creating this peer_req */ |
| 404 | __EE_IN_INTERVAL_TREE, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 405 | }; |
| 406 | #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 407 | #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 408 | #define EE_RESUBMITTED (1<<__EE_RESUBMITTED) |
| 409 | #define EE_WAS_ERROR (1<<__EE_WAS_ERROR) |
Lars Ellenberg | c36c3ce | 2010-08-11 20:42:55 +0200 | [diff] [blame] | 410 | #define EE_HAS_DIGEST (1<<__EE_HAS_DIGEST) |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 411 | #define EE_RESTART_REQUESTS (1<<__EE_RESTART_REQUESTS) |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 412 | #define EE_SEND_WRITE_ACK (1<<__EE_SEND_WRITE_ACK) |
Philipp Reisner | 302bdea | 2011-04-21 11:36:49 +0200 | [diff] [blame] | 413 | #define EE_IN_INTERVAL_TREE (1<<__EE_IN_INTERVAL_TREE) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 414 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 415 | /* flag bits per device */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 416 | enum { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 417 | UNPLUG_REMOTE, /* sending a "UnplugRemote" could help */ |
| 418 | MD_DIRTY, /* current uuids and flags not yet on disk */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 419 | USE_DEGR_WFC_T, /* degr-wfc-timeout instead of wfc-timeout. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 420 | CL_ST_CHG_SUCCESS, |
| 421 | CL_ST_CHG_FAIL, |
| 422 | CRASHED_PRIMARY, /* This node was a crashed primary. |
| 423 | * Gets cleared when the state.conn |
| 424 | * goes into C_CONNECTED state. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 425 | CONSIDER_RESYNC, |
| 426 | |
Philipp Reisner | a8a4e51 | 2010-08-25 10:21:04 +0200 | [diff] [blame] | 427 | MD_NO_FUA, /* Users wants us to not use FUA/FLUSH on meta data dev */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 428 | SUSPEND_IO, /* suspend application io */ |
| 429 | BITMAP_IO, /* suspend application io; |
| 430 | once no more io in flight, start bitmap io */ |
| 431 | BITMAP_IO_QUEUED, /* Started bitmap IO */ |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 432 | GO_DISKLESS, /* Disk is being detached, on io-error or admin request. */ |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 433 | WAS_IO_ERROR, /* Local disk failed, returned IO error */ |
| 434 | WAS_READ_ERROR, /* Local disk READ failed (set additionally to the above) */ |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 435 | FORCE_DETACH, /* Force-detach from local disk, aborting any pending local IO */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 436 | RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 437 | RESIZE_PENDING, /* Size change detected locally, waiting for the response from |
| 438 | * the peer, if it changed there as well. */ |
Philipp Reisner | 43a5182 | 2010-06-11 11:26:34 +0200 | [diff] [blame] | 439 | NEW_CUR_UUID, /* Create new current UUID when thawing IO */ |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 440 | AL_SUSPENDED, /* Activity logging is currently suspended. */ |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 441 | AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */ |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 442 | B_RS_H_DONE, /* Before resync handler done (already executed) */ |
Philipp Reisner | 08b165b | 2011-09-05 16:22:33 +0200 | [diff] [blame] | 443 | DISCARD_MY_DATA, /* discard_my_data flag per volume */ |
Philipp Reisner | 380207d | 2011-11-11 12:31:20 +0100 | [diff] [blame] | 444 | READ_BALANCE_RR, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 445 | }; |
| 446 | |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 447 | struct drbd_bitmap; /* opaque for drbd_device */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 448 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 449 | /* definition of bits in bm_flags to be used in drbd_bm_lock |
| 450 | * and drbd_bitmap_io and friends. */ |
| 451 | enum bm_flag { |
| 452 | /* do we need to kfree, or vfree bm_pages? */ |
| 453 | BM_P_VMALLOCED = 0x10000, /* internal use only, will be masked out */ |
| 454 | |
| 455 | /* currently locked for bulk operation */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 456 | BM_LOCKED_MASK = 0xf, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 457 | |
| 458 | /* in detail, that is: */ |
| 459 | BM_DONT_CLEAR = 0x1, |
| 460 | BM_DONT_SET = 0x2, |
| 461 | BM_DONT_TEST = 0x4, |
| 462 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 463 | /* so we can mark it locked for bulk operation, |
| 464 | * and still allow all non-bulk operations */ |
| 465 | BM_IS_LOCKED = 0x8, |
| 466 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 467 | /* (test bit, count bit) allowed (common case) */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 468 | 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] | 469 | |
| 470 | /* testing bits, as well as setting new bits allowed, but clearing bits |
| 471 | * would be unexpected. Used during bitmap receive. Setting new bits |
| 472 | * requires sending of "out-of-sync" information, though. */ |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 473 | BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 474 | |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 475 | /* for drbd_bm_write_copy_pages, everything is allowed, |
| 476 | * only concurrent bulk operations are locked out. */ |
| 477 | BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED, |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 478 | }; |
| 479 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 480 | struct drbd_work_queue { |
| 481 | struct list_head q; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 482 | spinlock_t q_lock; /* to protect the list. */ |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 483 | wait_queue_head_t q_wait; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 484 | }; |
| 485 | |
| 486 | struct drbd_socket { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 487 | struct mutex mutex; |
| 488 | struct socket *socket; |
| 489 | /* this way we get our |
| 490 | * send/receive buffers off the stack */ |
Andreas Gruenbacher | 5a87d92 | 2011-03-24 21:17:52 +0100 | [diff] [blame] | 491 | void *sbuf; |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 492 | void *rbuf; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 493 | }; |
| 494 | |
| 495 | struct drbd_md { |
| 496 | u64 md_offset; /* sector offset to 'super' block */ |
| 497 | |
| 498 | u64 la_size_sect; /* last agreed size, unit sectors */ |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 499 | spinlock_t uuid_lock; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 500 | u64 uuid[UI_SIZE]; |
| 501 | u64 device_uuid; |
| 502 | u32 flags; |
| 503 | u32 md_size_sect; |
| 504 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 505 | s32 al_offset; /* signed relative sector offset to activity log */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 506 | s32 bm_offset; /* signed relative sector offset to bitmap */ |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 507 | |
| 508 | /* cached value of bdev->disk_conf->meta_dev_idx (see below) */ |
| 509 | s32 meta_dev_idx; |
| 510 | |
| 511 | /* see al_tr_number_to_on_disk_sector() */ |
| 512 | u32 al_stripes; |
| 513 | u32 al_stripe_size_4k; |
| 514 | u32 al_size_4k; /* cached product of the above */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 515 | }; |
| 516 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 517 | struct drbd_backing_dev { |
| 518 | struct block_device *backing_bdev; |
| 519 | struct block_device *md_bdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 520 | struct drbd_md md; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 521 | struct disk_conf *disk_conf; /* RCU, for updates: resource->conf_update */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 522 | sector_t known_size; /* last known size of that backing device */ |
| 523 | }; |
| 524 | |
| 525 | struct drbd_md_io { |
Philipp Reisner | 0c46442 | 2011-06-26 22:26:31 +0200 | [diff] [blame] | 526 | unsigned int done; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 527 | int error; |
| 528 | }; |
| 529 | |
| 530 | struct bm_io_work { |
| 531 | struct drbd_work w; |
| 532 | char *why; |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 533 | enum bm_flag flags; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 534 | int (*io_fn)(struct drbd_device *device); |
| 535 | void (*done)(struct drbd_device *device, int rv); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 536 | }; |
| 537 | |
| 538 | enum write_ordering_e { |
| 539 | WO_none, |
| 540 | WO_drain_io, |
| 541 | WO_bdev_flush, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 542 | }; |
| 543 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 544 | struct fifo_buffer { |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 545 | unsigned int head_index; |
| 546 | unsigned int size; |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 547 | int total; /* sum of all values */ |
| 548 | int values[0]; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 549 | }; |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 550 | extern struct fifo_buffer *fifo_alloc(int fifo_size); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 551 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 552 | /* flag bits per connection */ |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 553 | enum { |
| 554 | NET_CONGESTED, /* The data socket is congested */ |
Lars Ellenberg | 427c043 | 2012-08-01 12:43:01 +0200 | [diff] [blame] | 555 | RESOLVE_CONFLICTS, /* Set on one node, cleared on the peer! */ |
Philipp Reisner | e43ef19 | 2011-02-07 14:40:40 +0100 | [diff] [blame] | 556 | SEND_PING, /* whether asender should send a ping asap */ |
Philipp Reisner | 808e37b | 2011-02-07 14:44:14 +0100 | [diff] [blame] | 557 | SIGNAL_ASENDER, /* whether asender wants to be interrupted */ |
Philipp Reisner | 2a67d8b | 2011-02-09 14:10:32 +0100 | [diff] [blame] | 558 | 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] | 559 | 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] | 560 | CONN_WD_ST_CHG_OKAY, |
| 561 | CONN_WD_ST_CHG_FAIL, |
Philipp Reisner | 8169e41 | 2011-03-15 18:40:27 +0100 | [diff] [blame] | 562 | CONN_DRY_RUN, /* Expect disconnect after resync handshake. */ |
Philipp Reisner | 6936fcb | 2011-11-10 18:45:36 +0100 | [diff] [blame] | 563 | CREATE_BARRIER, /* next P_DATA is preceded by a P_BARRIER */ |
Philipp Reisner | a1096a6 | 2012-04-06 12:07:34 +0200 | [diff] [blame] | 564 | STATE_SENT, /* Do not change state/UUIDs while this is set */ |
Lars Ellenberg | 6f3465e | 2012-07-30 09:08:25 +0200 | [diff] [blame] | 565 | CALLBACK_PENDING, /* Whether we have a call_usermodehelper(, UMH_WAIT_PROC) |
| 566 | * pending, from drbd worker context. |
| 567 | * If set, bdi_write_congested() returns true, |
| 568 | * so shrink_page_list() would not recurse into, |
| 569 | * and potentially deadlock on, this drbd worker. |
| 570 | */ |
Philipp Reisner | b66623e | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 571 | DISCONNECT_SENT, |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 572 | }; |
| 573 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 574 | struct drbd_resource { |
| 575 | char *name; |
| 576 | struct kref kref; |
Andreas Gruenbacher | 803ea13 | 2011-06-09 01:40:48 +0200 | [diff] [blame] | 577 | struct idr devices; /* volume number to device mapping */ |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 578 | struct list_head connections; |
| 579 | struct list_head resources; |
Andreas Gruenbacher | eb6bea6 | 2011-06-21 16:11:28 +0200 | [diff] [blame] | 580 | struct res_opts res_opts; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 581 | struct mutex conf_update; /* mutex for ready-copy-update of net_conf and disk_conf */ |
| 582 | spinlock_t req_lock; |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 583 | |
| 584 | unsigned susp:1; /* IO suspended by user */ |
| 585 | unsigned susp_nod:1; /* IO suspended because no data */ |
| 586 | unsigned susp_fen:1; /* IO suspended because fence peer handler runs */ |
Andreas Gruenbacher | 625a6ba | 2011-07-22 14:29:02 +0200 | [diff] [blame] | 587 | |
| 588 | cpumask_var_t cpu_mask; |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 589 | }; |
| 590 | |
| 591 | struct drbd_connection { |
| 592 | struct list_head connections; |
| 593 | struct drbd_resource *resource; |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 594 | struct kref kref; |
Andreas Gruenbacher | c06ece6 | 2011-06-21 17:23:59 +0200 | [diff] [blame] | 595 | struct idr peer_devices; /* volume number to peer device mapping */ |
Philipp Reisner | 8410da8 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 596 | enum drbd_conns cstate; /* Only C_STANDALONE to C_WF_REPORT_PARAMS */ |
| 597 | struct mutex cstate_mutex; /* Protects graceful disconnects */ |
Philipp Reisner | 28e448b | 2013-06-25 16:50:06 +0200 | [diff] [blame] | 598 | unsigned int connect_cnt; /* Inc each time a connection is established */ |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 599 | |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 600 | unsigned long flags; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 601 | struct net_conf *net_conf; /* content protected by rcu */ |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 602 | 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] | 603 | |
Andreas Gruenbacher | 089c075 | 2011-06-14 18:28:09 +0200 | [diff] [blame] | 604 | struct sockaddr_storage my_addr; |
| 605 | int my_addr_len; |
| 606 | struct sockaddr_storage peer_addr; |
| 607 | int peer_addr_len; |
| 608 | |
Philipp Reisner | e42325a | 2011-01-19 13:55:45 +0100 | [diff] [blame] | 609 | struct drbd_socket data; /* data/barrier/cstate/parameter packets */ |
| 610 | struct drbd_socket meta; /* ping/ack (metadata) packets */ |
Philipp Reisner | 31890f4 | 2011-01-19 14:12:51 +0100 | [diff] [blame] | 611 | int agreed_pro_version; /* actually used protocol version */ |
| 612 | unsigned long last_received; /* in jiffies, either socket */ |
| 613 | unsigned int ko_count; |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 614 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 615 | struct list_head transfer_log; /* all requests not yet fully processed */ |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 616 | |
Philipp Reisner | a063845 | 2011-01-19 14:31:32 +0100 | [diff] [blame] | 617 | struct crypto_hash *cram_hmac_tfm; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 618 | struct crypto_hash *integrity_tfm; /* checksums we compute, updates protected by connection->data->mutex */ |
Philipp Reisner | 036b17e | 2011-05-16 17:38:11 +0200 | [diff] [blame] | 619 | struct crypto_hash *peer_integrity_tfm; /* checksums we verify, only accessed from receiver thread */ |
Lars Ellenberg | f399002 | 2011-03-23 14:31:09 +0100 | [diff] [blame] | 620 | struct crypto_hash *csums_tfm; |
| 621 | struct crypto_hash *verify_tfm; |
Philipp Reisner | a063845 | 2011-01-19 14:31:32 +0100 | [diff] [blame] | 622 | void *int_dig_in; |
| 623 | void *int_dig_vv; |
| 624 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 625 | /* receiver side */ |
Philipp Reisner | 12038a3 | 2011-11-09 19:18:00 +0100 | [diff] [blame] | 626 | struct drbd_epoch *current_epoch; |
| 627 | spinlock_t epoch_lock; |
| 628 | unsigned int epochs; |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 629 | enum write_ordering_e write_ordering; |
Lars Ellenberg | b379c41 | 2011-11-17 11:49:46 +0100 | [diff] [blame] | 630 | atomic_t current_tle_nr; /* transfer log epoch number */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 631 | unsigned current_tle_writes; /* writes seen within this tl epoch */ |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 632 | |
Lars Ellenberg | 07be15b | 2012-05-07 11:53:08 +0200 | [diff] [blame] | 633 | unsigned long last_reconnect_jif; |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 634 | struct drbd_thread receiver; |
| 635 | struct drbd_thread worker; |
| 636 | struct drbd_thread asender; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 637 | |
| 638 | /* sender side */ |
Lars Ellenberg | d5b27b0 | 2011-11-14 15:42:37 +0100 | [diff] [blame] | 639 | struct drbd_work_queue sender_work; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 640 | |
| 641 | struct { |
| 642 | /* whether this sender thread |
| 643 | * has processed a single write yet. */ |
| 644 | bool seen_any_write_yet; |
| 645 | |
| 646 | /* Which barrier number to send with the next P_BARRIER */ |
| 647 | int current_epoch_nr; |
| 648 | |
| 649 | /* how many write requests have been sent |
| 650 | * with req->epoch == current_epoch_nr. |
| 651 | * If none, no P_BARRIER will be sent. */ |
| 652 | unsigned current_epoch_writes; |
| 653 | } send; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 654 | }; |
| 655 | |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 656 | struct submit_worker { |
| 657 | struct workqueue_struct *wq; |
| 658 | struct work_struct worker; |
| 659 | |
| 660 | spinlock_t lock; |
| 661 | struct list_head writes; |
| 662 | }; |
| 663 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 664 | struct drbd_peer_device { |
| 665 | struct list_head peer_devices; |
| 666 | struct drbd_device *device; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 667 | struct drbd_connection *connection; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 668 | }; |
| 669 | |
| 670 | struct drbd_device { |
Andreas Gruenbacher | d8628a8 | 2011-06-09 01:38:00 +0200 | [diff] [blame] | 671 | struct drbd_resource *resource; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 672 | struct list_head peer_devices; |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 673 | int vnr; /* volume number within the connection */ |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 674 | struct kref kref; |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 675 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 676 | /* things that are stored as / read from meta data on disk */ |
| 677 | unsigned long flags; |
| 678 | |
| 679 | /* configured by drbdsetup */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 680 | struct drbd_backing_dev *ldev __protected_by(local); |
| 681 | |
| 682 | sector_t p_size; /* partner's disk size */ |
| 683 | struct request_queue *rq_queue; |
| 684 | struct block_device *this_bdev; |
| 685 | struct gendisk *vdisk; |
| 686 | |
Lars Ellenberg | 07be15b | 2012-05-07 11:53:08 +0200 | [diff] [blame] | 687 | unsigned long last_reattach_jif; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 688 | struct drbd_work resync_work; |
| 689 | struct drbd_work unplug_work; |
| 690 | struct drbd_work go_diskless; |
| 691 | struct drbd_work md_sync_work; |
| 692 | struct drbd_work start_resync_work; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 693 | struct timer_list resync_timer; |
| 694 | struct timer_list md_sync_timer; |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 695 | struct timer_list start_resync_timer; |
Philipp Reisner | 7fde2be | 2011-03-01 11:08:28 +0100 | [diff] [blame] | 696 | struct timer_list request_timer; |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 697 | #ifdef DRBD_DEBUG_MD_SYNC |
| 698 | struct { |
| 699 | unsigned int line; |
| 700 | const char* func; |
| 701 | } last_md_mark_dirty; |
| 702 | #endif |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 703 | |
| 704 | /* Used after attach while negotiating new disk state. */ |
| 705 | union drbd_state new_state_tmp; |
| 706 | |
Philipp Reisner | da9fbc2 | 2011-03-29 10:52:01 +0200 | [diff] [blame] | 707 | union drbd_dev_state state; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 708 | wait_queue_head_t misc_wait; |
| 709 | wait_queue_head_t state_wait; /* upon each state change. */ |
| 710 | unsigned int send_cnt; |
| 711 | unsigned int recv_cnt; |
| 712 | unsigned int read_cnt; |
| 713 | unsigned int writ_cnt; |
| 714 | unsigned int al_writ_cnt; |
| 715 | unsigned int bm_writ_cnt; |
| 716 | atomic_t ap_bio_cnt; /* Requests we need to complete */ |
| 717 | atomic_t ap_pending_cnt; /* AP data packets on the wire, ack expected */ |
| 718 | atomic_t rs_pending_cnt; /* RS request/data packets on the wire */ |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 719 | atomic_t unacked_cnt; /* Need to send replies for */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 720 | atomic_t local_cnt; /* Waiting for local completion */ |
Philipp Reisner | b2fb6dbe | 2011-01-19 13:48:44 +0100 | [diff] [blame] | 721 | |
Andreas Gruenbacher | dac1389 | 2011-01-21 17:18:39 +0100 | [diff] [blame] | 722 | /* Interval tree of pending local requests */ |
| 723 | struct rb_root read_requests; |
Andreas Gruenbacher | de69671 | 2011-01-20 15:00:24 +0100 | [diff] [blame] | 724 | struct rb_root write_requests; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 725 | |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 726 | /* blocks to resync in this run [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 727 | unsigned long rs_total; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 728 | /* number of resync blocks that failed in this run */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 729 | unsigned long rs_failed; |
| 730 | /* Syncer's start time [unit jiffies] */ |
| 731 | unsigned long rs_start; |
| 732 | /* cumulated time in PausedSyncX state [unit jiffies] */ |
| 733 | unsigned long rs_paused; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 734 | /* skipped because csum was equal [unit BM_BLOCK_SIZE] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 735 | unsigned long rs_same_csum; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 736 | #define DRBD_SYNC_MARKS 8 |
| 737 | #define DRBD_SYNC_MARK_STEP (3*HZ) |
| 738 | /* block not up-to-date at mark [unit BM_BLOCK_SIZE] */ |
| 739 | unsigned long rs_mark_left[DRBD_SYNC_MARKS]; |
| 740 | /* marks's time [unit jiffies] */ |
| 741 | unsigned long rs_mark_time[DRBD_SYNC_MARKS]; |
| 742 | /* current index into rs_mark_{left,time} */ |
| 743 | int rs_last_mark; |
Philipp Reisner | 328e0f12 | 2012-10-19 14:37:47 +0200 | [diff] [blame] | 744 | unsigned long rs_last_bcast; /* [unit jiffies] */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 745 | |
| 746 | /* where does the admin want us to start? (sector) */ |
| 747 | sector_t ov_start_sector; |
Lars Ellenberg | 02b91b5 | 2012-06-28 18:26:52 +0200 | [diff] [blame] | 748 | sector_t ov_stop_sector; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 749 | /* where are we now? (sector) */ |
| 750 | sector_t ov_position; |
| 751 | /* Start sector of out of sync range (to merge printk reporting). */ |
| 752 | sector_t ov_last_oos_start; |
| 753 | /* size of out-of-sync range in sectors. */ |
| 754 | sector_t ov_last_oos_size; |
| 755 | unsigned long ov_left; /* in bits */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 756 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 757 | struct drbd_bitmap *bitmap; |
| 758 | unsigned long bm_resync_fo; /* bit offset for drbd_bm_find_next */ |
| 759 | |
| 760 | /* Used to track operations of resync... */ |
| 761 | struct lru_cache *resync; |
| 762 | /* Number of locked elements in resync LRU */ |
| 763 | unsigned int resync_locked; |
| 764 | /* resync extent number waiting for application requests */ |
| 765 | unsigned int resync_wenr; |
| 766 | |
| 767 | int open_cnt; |
| 768 | u64 *p_uuid; |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 769 | |
Philipp Reisner | 8571957 | 2010-07-21 10:20:17 +0200 | [diff] [blame] | 770 | struct list_head active_ee; /* IO in progress (P_DATA gets written to disk) */ |
| 771 | 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] | 772 | struct list_head done_ee; /* need to send P_WRITE_ACK */ |
| 773 | struct list_head read_ee; /* [RS]P_DATA_REQUEST being read */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 774 | struct list_head net_ee; /* zero-copy network send in progress */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 775 | |
| 776 | int next_barrier_nr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 777 | struct list_head resync_reads; |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 778 | atomic_t pp_in_use; /* allocated from page pool */ |
| 779 | 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] | 780 | wait_queue_head_t ee_wait; |
| 781 | struct page *md_io_page; /* one page buffer for md_io */ |
Philipp Reisner | cc94c65 | 2011-06-26 11:20:27 +0200 | [diff] [blame] | 782 | struct drbd_md_io md_io; |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 783 | atomic_t md_io_in_use; /* protects the md_io, md_io_page and md_io_tmpp */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 784 | spinlock_t al_lock; |
| 785 | wait_queue_head_t al_wait; |
| 786 | struct lru_cache *act_log; /* activity log */ |
| 787 | unsigned int al_tr_number; |
| 788 | int al_tr_cycle; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 789 | wait_queue_head_t seq_wait; |
| 790 | atomic_t packet_seq; |
| 791 | unsigned int peer_seq; |
| 792 | spinlock_t peer_seq_lock; |
| 793 | unsigned int minor; |
| 794 | unsigned long comm_bm_set; /* communicated number of set bits. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 795 | struct bm_io_work bm_io_work; |
| 796 | u64 ed_uuid; /* UUID of the exposed data */ |
Philipp Reisner | 8410da8 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 797 | struct mutex own_state_mutex; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 798 | 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] | 799 | char congestion_reason; /* Why we where congested... */ |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 800 | atomic_t rs_sect_in; /* for incoming resync data rate, SyncTarget */ |
| 801 | atomic_t rs_sect_ev; /* for submitted resync data rate, both */ |
| 802 | int rs_last_sect_ev; /* counter to compare with */ |
| 803 | int rs_last_events; /* counter of read or write "events" (unit sectors) |
| 804 | * on the lower level device when we last looked. */ |
| 805 | int c_sync_rate; /* current resync rate after syncer throttle magic */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 806 | 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] | 807 | 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] | 808 | atomic_t ap_in_flight; /* App sectors in flight (waiting for ack) */ |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 809 | unsigned int peer_max_bio_size; |
| 810 | unsigned int local_max_bio_size; |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 811 | |
| 812 | /* any requests that would block in drbd_make_request() |
| 813 | * are deferred to this single-threaded work queue */ |
| 814 | struct submit_worker submit; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 815 | }; |
| 816 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 817 | static inline struct drbd_device *minor_to_device(unsigned int minor) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 818 | { |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 819 | return (struct drbd_device *)idr_find(&drbd_devices, minor); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 820 | } |
| 821 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 822 | static inline struct drbd_peer_device *first_peer_device(struct drbd_device *device) |
| 823 | { |
| 824 | return list_first_entry(&device->peer_devices, struct drbd_peer_device, peer_devices); |
| 825 | } |
| 826 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 827 | #define for_each_resource(resource, _resources) \ |
| 828 | list_for_each_entry(resource, _resources, resources) |
| 829 | |
| 830 | #define for_each_resource_rcu(resource, _resources) \ |
| 831 | list_for_each_entry_rcu(resource, _resources, resources) |
| 832 | |
| 833 | #define for_each_resource_safe(resource, tmp, _resources) \ |
| 834 | list_for_each_entry_safe(resource, tmp, _resources, resources) |
| 835 | |
| 836 | #define for_each_connection(connection, resource) \ |
| 837 | list_for_each_entry(connection, &resource->connections, connections) |
| 838 | |
| 839 | #define for_each_connection_rcu(connection, resource) \ |
| 840 | list_for_each_entry_rcu(connection, &resource->connections, connections) |
| 841 | |
| 842 | #define for_each_connection_safe(connection, tmp, resource) \ |
| 843 | list_for_each_entry_safe(connection, tmp, &resource->connections, connections) |
| 844 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 845 | #define for_each_peer_device(peer_device, device) \ |
| 846 | list_for_each_entry(peer_device, &device->peer_devices, peer_devices) |
| 847 | |
| 848 | #define for_each_peer_device_rcu(peer_device, device) \ |
| 849 | list_for_each_entry_rcu(peer_device, &device->peer_devices, peer_devices) |
| 850 | |
| 851 | #define for_each_peer_device_safe(peer_device, tmp, device) \ |
| 852 | list_for_each_entry_safe(peer_device, tmp, &device->peer_devices, peer_devices) |
| 853 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 854 | static inline unsigned int device_to_minor(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 855 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 856 | return device->minor; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 857 | } |
| 858 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 859 | /* |
| 860 | * function declarations |
| 861 | *************************/ |
| 862 | |
| 863 | /* drbd_main.c */ |
| 864 | |
Philipp Reisner | e89b591 | 2010-03-24 17:11:33 +0100 | [diff] [blame] | 865 | enum dds_flags { |
| 866 | DDSF_FORCED = 1, |
| 867 | DDSF_NO_RESYNC = 2, /* Do not run a resync for the new space */ |
| 868 | }; |
| 869 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 870 | extern void drbd_init_set_defaults(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 871 | extern int drbd_thread_start(struct drbd_thread *thi); |
| 872 | extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait); |
| 873 | #ifdef CONFIG_SMP |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 874 | extern void drbd_thread_current_set_cpu(struct drbd_thread *thi); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 875 | #else |
| 876 | #define drbd_thread_current_set_cpu(A) ({}) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 877 | #endif |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 878 | extern void tl_release(struct drbd_connection *, unsigned int barrier_nr, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 879 | unsigned int set_size); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 880 | extern void tl_clear(struct drbd_connection *); |
| 881 | extern void drbd_free_sock(struct drbd_connection *connection); |
| 882 | extern int drbd_send(struct drbd_connection *connection, struct socket *sock, |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 883 | void *buf, size_t size, unsigned msg_flags); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 884 | 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] | 885 | unsigned); |
| 886 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 887 | extern int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd); |
| 888 | extern int drbd_send_protocol(struct drbd_connection *connection); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 889 | extern int drbd_send_uuids(struct drbd_peer_device *); |
| 890 | extern int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *); |
| 891 | extern void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *); |
| 892 | extern int drbd_send_sizes(struct drbd_peer_device *, int trigger_reply, enum dds_flags flags); |
| 893 | extern int drbd_send_state(struct drbd_peer_device *, union drbd_state s); |
| 894 | extern int drbd_send_current_state(struct drbd_peer_device *); |
| 895 | extern int drbd_send_sync_param(struct drbd_peer_device *); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 896 | 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] | 897 | u32 set_size); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 898 | extern int drbd_send_ack(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 899 | struct drbd_peer_request *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 900 | 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] | 901 | struct p_block_req *rp); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 902 | 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] | 903 | struct p_data *dp, int data_size); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 904 | 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] | 905 | sector_t sector, int blksize, u64 block_id); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 906 | extern int drbd_send_out_of_sync(struct drbd_peer_device *, struct drbd_request *); |
| 907 | extern int drbd_send_block(struct drbd_peer_device *, enum drbd_packet, |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 908 | struct drbd_peer_request *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 909 | extern int drbd_send_dblock(struct drbd_peer_device *, struct drbd_request *req); |
| 910 | extern int drbd_send_drequest(struct drbd_peer_device *, int cmd, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 911 | sector_t sector, int size, u64 block_id); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 912 | 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] | 913 | int size, void *digest, int digest_size, |
| 914 | enum drbd_packet cmd); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 915 | 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] | 916 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 917 | extern int drbd_send_bitmap(struct drbd_device *device); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 918 | 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] | 919 | extern void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 920 | extern void drbd_free_bc(struct drbd_backing_dev *ldev); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 921 | extern void drbd_device_cleanup(struct drbd_device *device); |
| 922 | void drbd_print_uuids(struct drbd_device *device, const char *text); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 923 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 924 | extern void conn_md_sync(struct drbd_connection *connection); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 925 | extern void drbd_md_write(struct drbd_device *device, void *buffer); |
| 926 | extern void drbd_md_sync(struct drbd_device *device); |
| 927 | extern int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev); |
| 928 | extern void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 929 | extern void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 930 | extern void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local); |
| 931 | extern void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local); |
| 932 | extern void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local); |
| 933 | extern void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); |
| 934 | extern void drbd_md_set_flag(struct drbd_device *device, int flags) __must_hold(local); |
| 935 | 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] | 936 | extern int drbd_md_test_flag(struct drbd_backing_dev *, int); |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 937 | #ifndef DRBD_DEBUG_MD_SYNC |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 938 | extern void drbd_md_mark_dirty(struct drbd_device *device); |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 939 | #else |
| 940 | #define drbd_md_mark_dirty(m) drbd_md_mark_dirty_(m, __LINE__ , __func__ ) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 941 | extern void drbd_md_mark_dirty_(struct drbd_device *device, |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 942 | unsigned int line, const char *func); |
| 943 | #endif |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 944 | extern void drbd_queue_bitmap_io(struct drbd_device *device, |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 945 | int (*io_fn)(struct drbd_device *), |
| 946 | void (*done)(struct drbd_device *, int), |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 947 | char *why, enum bm_flag flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 948 | extern int drbd_bitmap_io(struct drbd_device *device, |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 949 | int (*io_fn)(struct drbd_device *), |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 950 | char *why, enum bm_flag flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 951 | extern int drbd_bitmap_io_from_worker(struct drbd_device *device, |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 952 | int (*io_fn)(struct drbd_device *), |
Lars Ellenberg | edc9f5e | 2012-09-27 15:18:21 +0200 | [diff] [blame] | 953 | char *why, enum bm_flag flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 954 | extern int drbd_bmio_set_n_write(struct drbd_device *device); |
| 955 | extern int drbd_bmio_clear_n_write(struct drbd_device *device); |
| 956 | extern void drbd_ldev_destroy(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 957 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 958 | /* Meta data layout |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 959 | * |
| 960 | * We currently have two possible layouts. |
| 961 | * Offsets in (512 byte) sectors. |
| 962 | * external: |
| 963 | * |----------- md_size_sect ------------------| |
| 964 | * [ 4k superblock ][ activity log ][ Bitmap ] |
| 965 | * | al_offset == 8 | |
| 966 | * | bm_offset = al_offset + X | |
| 967 | * ==> bitmap sectors = md_size_sect - bm_offset |
| 968 | * |
| 969 | * Variants: |
| 970 | * old, indexed fixed size meta data: |
| 971 | * |
| 972 | * internal: |
| 973 | * |----------- md_size_sect ------------------| |
| 974 | * [data.....][ Bitmap ][ activity log ][ 4k superblock ][padding*] |
| 975 | * | al_offset < 0 | |
| 976 | * | bm_offset = al_offset - Y | |
| 977 | * ==> bitmap sectors = Y = al_offset - bm_offset |
| 978 | * |
| 979 | * [padding*] are zero or up to 7 unused 512 Byte sectors to the |
| 980 | * end of the device, so that the [4k superblock] will be 4k aligned. |
| 981 | * |
| 982 | * The activity log consists of 4k transaction blocks, |
| 983 | * which are written in a ring-buffer, or striped ring-buffer like fashion, |
| 984 | * which are writtensize used to be fixed 32kB, |
| 985 | * but is about to become configurable. |
| 986 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 987 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 988 | /* Our old fixed size meta data layout |
| 989 | * allows up to about 3.8TB, so if you want more, |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 990 | * you need to use the "flexible" meta data format. */ |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 991 | #define MD_128MB_SECT (128LLU << 11) /* 128 MB, unit sectors */ |
| 992 | #define MD_4kB_SECT 8 |
| 993 | #define MD_32kB_SECT 64 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 994 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 995 | /* One activity log extent represents 4M of storage */ |
| 996 | #define AL_EXTENT_SHIFT 22 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 997 | #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT) |
| 998 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 999 | /* We could make these currently hardcoded constants configurable |
| 1000 | * variables at create-md time (or even re-configurable at runtime?). |
| 1001 | * Which will require some more changes to the DRBD "super block" |
| 1002 | * and attach code. |
| 1003 | * |
| 1004 | * updates per transaction: |
| 1005 | * This many changes to the active set can be logged with one transaction. |
| 1006 | * This number is arbitrary. |
| 1007 | * context per transaction: |
| 1008 | * This many context extent numbers are logged with each transaction. |
| 1009 | * This number is resulting from the transaction block size (4k), the layout |
| 1010 | * of the transaction header, and the number of updates per transaction. |
| 1011 | * See drbd_actlog.c:struct al_transaction_on_disk |
| 1012 | * */ |
| 1013 | #define AL_UPDATES_PER_TRANSACTION 64 // arbitrary |
| 1014 | #define AL_CONTEXT_PER_TRANSACTION 919 // (4096 - 36 - 6*64)/4 |
| 1015 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1016 | #if BITS_PER_LONG == 32 |
| 1017 | #define LN2_BPL 5 |
| 1018 | #define cpu_to_lel(A) cpu_to_le32(A) |
| 1019 | #define lel_to_cpu(A) le32_to_cpu(A) |
| 1020 | #elif BITS_PER_LONG == 64 |
| 1021 | #define LN2_BPL 6 |
| 1022 | #define cpu_to_lel(A) cpu_to_le64(A) |
| 1023 | #define lel_to_cpu(A) le64_to_cpu(A) |
| 1024 | #else |
| 1025 | #error "LN2 of BITS_PER_LONG unknown!" |
| 1026 | #endif |
| 1027 | |
| 1028 | /* resync bitmap */ |
| 1029 | /* 16MB sized 'bitmap extent' to track syncer usage */ |
| 1030 | struct bm_extent { |
| 1031 | int rs_left; /* number of bits set (out of sync) in this extent. */ |
| 1032 | int rs_failed; /* number of failed resync requests in this extent. */ |
| 1033 | unsigned long flags; |
| 1034 | struct lc_element lce; |
| 1035 | }; |
| 1036 | |
| 1037 | #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */ |
| 1038 | #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */ |
Philipp Reisner | e3555d8 | 2010-11-07 15:56:29 +0100 | [diff] [blame] | 1039 | #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] | 1040 | |
| 1041 | /* drbd_bitmap.c */ |
| 1042 | /* |
| 1043 | * We need to store one bit for a block. |
| 1044 | * Example: 1GB disk @ 4096 byte blocks ==> we need 32 KB bitmap. |
| 1045 | * Bit 0 ==> local node thinks this block is binary identical on both nodes |
| 1046 | * Bit 1 ==> local node thinks this block needs to be synced. |
| 1047 | */ |
| 1048 | |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 1049 | #define SLEEP_TIME (HZ/10) |
| 1050 | |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1051 | /* We do bitmap IO in units of 4k blocks. |
| 1052 | * We also still have a hardcoded 4k per bit relation. */ |
| 1053 | #define BM_BLOCK_SHIFT 12 /* 4k per bit */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1054 | #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT) |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1055 | /* mostly arbitrarily set the represented size of one bitmap extent, |
| 1056 | * aka resync extent, to 16 MiB (which is also 512 Byte worth of bitmap |
| 1057 | * at 4k per bit resolution) */ |
| 1058 | #define BM_EXT_SHIFT 24 /* 16 MiB per resync extent */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1059 | #define BM_EXT_SIZE (1<<BM_EXT_SHIFT) |
| 1060 | |
| 1061 | #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12) |
| 1062 | #error "HAVE YOU FIXED drbdmeta AS WELL??" |
| 1063 | #endif |
| 1064 | |
| 1065 | /* thus many _storage_ sectors are described by one bit */ |
| 1066 | #define BM_SECT_TO_BIT(x) ((x)>>(BM_BLOCK_SHIFT-9)) |
| 1067 | #define BM_BIT_TO_SECT(x) ((sector_t)(x)<<(BM_BLOCK_SHIFT-9)) |
| 1068 | #define BM_SECT_PER_BIT BM_BIT_TO_SECT(1) |
| 1069 | |
| 1070 | /* bit to represented kilo byte conversion */ |
| 1071 | #define Bit2KB(bits) ((bits)<<(BM_BLOCK_SHIFT-10)) |
| 1072 | |
| 1073 | /* in which _bitmap_ extent (resp. sector) the bit for a certain |
| 1074 | * _storage_ sector is located in */ |
| 1075 | #define BM_SECT_TO_EXT(x) ((x)>>(BM_EXT_SHIFT-9)) |
| 1076 | |
| 1077 | /* how much _storage_ sectors we have per bitmap sector */ |
| 1078 | #define BM_EXT_TO_SECT(x) ((sector_t)(x) << (BM_EXT_SHIFT-9)) |
| 1079 | #define BM_SECT_PER_EXT BM_EXT_TO_SECT(1) |
| 1080 | |
| 1081 | /* in one sector of the bitmap, we have this many activity_log extents. */ |
| 1082 | #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] | 1083 | |
| 1084 | #define BM_BLOCKS_PER_BM_EXT_B (BM_EXT_SHIFT - BM_BLOCK_SHIFT) |
| 1085 | #define BM_BLOCKS_PER_BM_EXT_MASK ((1<<BM_BLOCKS_PER_BM_EXT_B) - 1) |
| 1086 | |
| 1087 | /* the extent in "PER_EXTENT" below is an activity log extent |
| 1088 | * we need that many (long words/bytes) to store the bitmap |
| 1089 | * of one AL_EXTENT_SIZE chunk of storage. |
| 1090 | * we can store the bitmap for that many AL_EXTENTS within |
| 1091 | * one sector of the _on_disk_ bitmap: |
| 1092 | * bit 0 bit 37 bit 38 bit (512*8)-1 |
| 1093 | * ...|........|........|.. // ..|........| |
| 1094 | * sect. 0 `296 `304 ^(512*8*8)-1 |
| 1095 | * |
| 1096 | #define BM_WORDS_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / BITS_PER_LONG ) |
| 1097 | #define BM_BYTES_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / 8 ) // 128 |
| 1098 | #define BM_EXT_PER_SECT ( 512 / BM_BYTES_PER_EXTENT ) // 4 |
| 1099 | */ |
| 1100 | |
| 1101 | #define DRBD_MAX_SECTORS_32 (0xffffffffLU) |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1102 | /* we have a certain meta data variant that has a fixed on-disk size of 128 |
| 1103 | * MiB, of which 4k are our "superblock", and 32k are the fixed size activity |
| 1104 | * log, leaving this many sectors for the bitmap. |
| 1105 | */ |
| 1106 | |
| 1107 | #define DRBD_MAX_SECTORS_FIXED_BM \ |
| 1108 | ((MD_128MB_SECT - MD_32kB_SECT - MD_4kB_SECT) * (1LL<<(BM_EXT_SHIFT-9))) |
| 1109 | #if !defined(CONFIG_LBDAF) && BITS_PER_LONG == 32 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1110 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_32 |
| 1111 | #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_32 |
| 1112 | #else |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1113 | #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_FIXED_BM |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1114 | /* 16 TB in units of sectors */ |
| 1115 | #if BITS_PER_LONG == 32 |
| 1116 | /* adjust by one page worth of bitmap, |
| 1117 | * so we won't wrap around in drbd_bm_find_next_bit. |
| 1118 | * you should use 64bit OS for that much storage, anyways. */ |
| 1119 | #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) |
| 1120 | #else |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1121 | /* we allow up to 1 PiB now on 64bit architecture with "flexible" meta data */ |
| 1122 | #define DRBD_MAX_SECTORS_FLEX (1UL << 51) |
| 1123 | /* corresponds to (1UL << 38) bits right now. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1124 | #endif |
| 1125 | #endif |
| 1126 | |
Lars Ellenberg | 23361cf | 2011-03-31 16:36:43 +0200 | [diff] [blame] | 1127 | /* BIO_MAX_SIZE is 256 * PAGE_CACHE_SIZE, |
| 1128 | * so for typical PAGE_CACHE_SIZE of 4k, that is (1<<20) Byte. |
| 1129 | * Since we may live in a mixed-platform cluster, |
| 1130 | * we limit us to a platform agnostic constant here for now. |
| 1131 | * A followup commit may allow even bigger BIO sizes, |
| 1132 | * once we thought that through. */ |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 1133 | #define DRBD_MAX_BIO_SIZE (1U << 20) |
Lars Ellenberg | 23361cf | 2011-03-31 16:36:43 +0200 | [diff] [blame] | 1134 | #if DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE |
| 1135 | #error Architecture not supported: DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE |
| 1136 | #endif |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 1137 | #define DRBD_MAX_BIO_SIZE_SAFE (1U << 12) /* Works always = 4k */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1138 | |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 1139 | #define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* Header 80 only allows packets up to 32KiB data */ |
| 1140 | #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] | 1141 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1142 | extern int drbd_bm_init(struct drbd_device *device); |
| 1143 | extern int drbd_bm_resize(struct drbd_device *device, sector_t sectors, int set_new_bits); |
| 1144 | extern void drbd_bm_cleanup(struct drbd_device *device); |
| 1145 | extern void drbd_bm_set_all(struct drbd_device *device); |
| 1146 | extern void drbd_bm_clear_all(struct drbd_device *device); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1147 | /* set/clear/test only a few bits at a time */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1148 | extern int drbd_bm_set_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1149 | struct drbd_device *device, unsigned long s, unsigned long e); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1150 | extern int drbd_bm_clear_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1151 | struct drbd_device *device, unsigned long s, unsigned long e); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1152 | extern int drbd_bm_count_bits( |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1153 | struct drbd_device *device, const unsigned long s, const unsigned long e); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1154 | /* bm_set_bits variant for use while holding drbd_bm_lock, |
| 1155 | * may process the whole bitmap in one go */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1156 | extern void _drbd_bm_set_bits(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1157 | const unsigned long s, const unsigned long e); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1158 | extern int drbd_bm_test_bit(struct drbd_device *device, unsigned long bitnr); |
| 1159 | extern int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr); |
| 1160 | extern int drbd_bm_write_page(struct drbd_device *device, unsigned int idx) __must_hold(local); |
| 1161 | extern int drbd_bm_read(struct drbd_device *device) __must_hold(local); |
| 1162 | extern void drbd_bm_mark_for_writeout(struct drbd_device *device, int page_nr); |
| 1163 | extern int drbd_bm_write(struct drbd_device *device) __must_hold(local); |
| 1164 | extern int drbd_bm_write_hinted(struct drbd_device *device) __must_hold(local); |
| 1165 | extern int drbd_bm_write_all(struct drbd_device *device) __must_hold(local); |
| 1166 | extern int drbd_bm_write_copy_pages(struct drbd_device *device) __must_hold(local); |
| 1167 | extern size_t drbd_bm_words(struct drbd_device *device); |
| 1168 | extern unsigned long drbd_bm_bits(struct drbd_device *device); |
| 1169 | extern sector_t drbd_bm_capacity(struct drbd_device *device); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1170 | |
| 1171 | #define DRBD_END_OF_BITMAP (~(unsigned long)0) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1172 | 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] | 1173 | /* bm_find_next variants for use while you hold drbd_bm_lock() */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1174 | extern unsigned long _drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); |
| 1175 | extern unsigned long _drbd_bm_find_next_zero(struct drbd_device *device, unsigned long bm_fo); |
| 1176 | extern unsigned long _drbd_bm_total_weight(struct drbd_device *device); |
| 1177 | extern unsigned long drbd_bm_total_weight(struct drbd_device *device); |
| 1178 | extern int drbd_bm_rs_done(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1179 | /* for receive_bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1180 | 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] | 1181 | size_t number, unsigned long *buffer); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1182 | /* for _drbd_send_bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1183 | 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] | 1184 | size_t number, unsigned long *buffer); |
| 1185 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1186 | extern void drbd_bm_lock(struct drbd_device *device, char *why, enum bm_flag flags); |
| 1187 | extern void drbd_bm_unlock(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1188 | /* drbd_main.c */ |
| 1189 | |
| 1190 | extern struct kmem_cache *drbd_request_cache; |
Andreas Gruenbacher | 6c852be | 2011-02-04 15:38:52 +0100 | [diff] [blame] | 1191 | extern struct kmem_cache *drbd_ee_cache; /* peer requests */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1192 | extern struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
| 1193 | extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
| 1194 | extern mempool_t *drbd_request_mempool; |
| 1195 | extern mempool_t *drbd_ee_mempool; |
| 1196 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1197 | /* drbd's page pool, used to buffer data received from the peer, |
| 1198 | * or data requested by the peer. |
| 1199 | * |
| 1200 | * This does not have an emergency reserve. |
| 1201 | * |
| 1202 | * When allocating from this pool, it first takes pages from the pool. |
| 1203 | * Only if the pool is depleted will try to allocate from the system. |
| 1204 | * |
| 1205 | * The assumption is that pages taken from this pool will be processed, |
| 1206 | * and given back, "quickly", and then can be recycled, so we can avoid |
| 1207 | * frequent calls to alloc_page(), and still will be able to make progress even |
| 1208 | * under memory pressure. |
| 1209 | */ |
| 1210 | extern struct page *drbd_pp_pool; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1211 | extern spinlock_t drbd_pp_lock; |
| 1212 | extern int drbd_pp_vacant; |
| 1213 | extern wait_queue_head_t drbd_pp_wait; |
| 1214 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 1215 | /* We also need a standard (emergency-reserve backed) page pool |
| 1216 | * for meta data IO (activity log, bitmap). |
| 1217 | * We can keep it global, as long as it is used as "N pages at a time". |
| 1218 | * 128 should be plenty, currently we probably can get away with as few as 1. |
| 1219 | */ |
| 1220 | #define DRBD_MIN_POOL_PAGES 128 |
| 1221 | extern mempool_t *drbd_md_io_page_pool; |
| 1222 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 1223 | /* We also need to make sure we get a bio |
| 1224 | * when we need it for housekeeping purposes */ |
| 1225 | extern struct bio_set *drbd_md_io_bio_set; |
| 1226 | /* to allocate from that set */ |
| 1227 | extern struct bio *bio_alloc_drbd(gfp_t gfp_mask); |
| 1228 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1229 | extern rwlock_t global_state_lock; |
| 1230 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1231 | extern int conn_lowest_minor(struct drbd_connection *connection); |
Andreas Gruenbacher | 59515a2 | 2011-07-06 14:20:49 +0200 | [diff] [blame] | 1232 | enum drbd_ret_code drbd_create_device(struct drbd_resource *resource, unsigned int minor, int vnr); |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 1233 | extern void drbd_destroy_device(struct kref *kref); |
Andreas Gruenbacher | f82795d | 2011-07-03 23:32:26 +0200 | [diff] [blame] | 1234 | extern void drbd_delete_device(struct drbd_device *mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1235 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 1236 | extern struct drbd_resource *drbd_create_resource(const char *name); |
| 1237 | extern void drbd_free_resource(struct drbd_resource *resource); |
| 1238 | |
Andreas Gruenbacher | eb6bea6 | 2011-06-21 16:11:28 +0200 | [diff] [blame] | 1239 | 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] | 1240 | 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] | 1241 | extern void drbd_destroy_connection(struct kref *kref); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1242 | 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] | 1243 | void *peer_addr, int peer_addr_len); |
Andreas Gruenbacher | 4bc7604 | 2011-06-13 14:27:45 +0200 | [diff] [blame] | 1244 | extern struct drbd_resource *drbd_find_resource(const char *name); |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 1245 | extern void drbd_destroy_resource(struct kref *kref); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1246 | extern void conn_free_crypto(struct drbd_connection *connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1247 | |
| 1248 | extern int proc_details; |
| 1249 | |
| 1250 | /* drbd_req */ |
Lars Ellenberg | 113fef9 | 2013-03-22 18:14:40 -0600 | [diff] [blame] | 1251 | extern void do_submit(struct work_struct *ws); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1252 | extern void __drbd_make_request(struct drbd_device *, struct bio *, unsigned long); |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 1253 | extern void drbd_make_request(struct request_queue *q, struct bio *bio); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1254 | 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] | 1255 | extern int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *bvec); |
| 1256 | extern int is_valid_ar_handle(struct drbd_request *, sector_t); |
| 1257 | |
| 1258 | |
| 1259 | /* drbd_nl.c */ |
Lars Ellenberg | 8432b31 | 2011-03-08 16:11:16 +0100 | [diff] [blame] | 1260 | extern int drbd_msg_put_info(const char *info); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1261 | extern void drbd_suspend_io(struct drbd_device *device); |
| 1262 | extern void drbd_resume_io(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1263 | extern char *ppsize(char *buf, unsigned long long size); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1264 | 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] | 1265 | enum determine_dev_size { |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 1266 | DS_ERROR_SHRINK = -3, |
| 1267 | DS_ERROR_SPACE_MD = -2, |
Philipp Reisner | e96c963 | 2013-06-25 16:50:07 +0200 | [diff] [blame] | 1268 | DS_ERROR = -1, |
| 1269 | DS_UNCHANGED = 0, |
| 1270 | DS_SHRUNK = 1, |
Philipp Reisner | 57737ad | 2013-10-23 10:59:17 +0200 | [diff] [blame] | 1271 | DS_GREW = 2, |
| 1272 | DS_GREW_FROM_ZERO = 3, |
Philipp Reisner | e96c963 | 2013-06-25 16:50:07 +0200 | [diff] [blame] | 1273 | }; |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 1274 | extern enum determine_dev_size |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1275 | drbd_determine_dev_size(struct drbd_device *, enum dds_flags, struct resize_parms *) __must_hold(local); |
| 1276 | extern void resync_after_online_grow(struct drbd_device *); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1277 | extern void drbd_reconsider_max_bio_size(struct drbd_device *device); |
| 1278 | extern enum drbd_state_rv drbd_set_role(struct drbd_device *device, |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1279 | enum drbd_role new_role, |
| 1280 | int force); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1281 | extern bool conn_try_outdate_peer(struct drbd_connection *connection); |
| 1282 | extern void conn_try_outdate_peer_async(struct drbd_connection *connection); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1283 | extern int drbd_khelper(struct drbd_device *device, char *cmd); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1284 | |
| 1285 | /* drbd_worker.c */ |
| 1286 | extern int drbd_worker(struct drbd_thread *thi); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1287 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor); |
| 1288 | void drbd_resync_after_changed(struct drbd_device *device); |
| 1289 | extern void drbd_start_resync(struct drbd_device *device, enum drbd_conns side); |
| 1290 | extern void resume_next_sg(struct drbd_device *device); |
| 1291 | extern void suspend_other_sg(struct drbd_device *device); |
| 1292 | extern int drbd_resync_finished(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1293 | /* maybe rather drbd_main.c ? */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1294 | extern void *drbd_md_get_buffer(struct drbd_device *device); |
| 1295 | extern void drbd_md_put_buffer(struct drbd_device *device); |
| 1296 | extern int drbd_md_sync_page_io(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1297 | struct drbd_backing_dev *bdev, sector_t sector, int rw); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1298 | 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] | 1299 | extern void wait_until_done_or_force_detached(struct drbd_device *device, |
Lars Ellenberg | 44edfb0 | 2012-09-27 13:03:45 +0200 | [diff] [blame] | 1300 | struct drbd_backing_dev *bdev, unsigned int *done); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1301 | extern void drbd_rs_controller_reset(struct drbd_device *device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1302 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1303 | static inline void ov_out_of_sync_print(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1304 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1305 | if (device->ov_last_oos_size) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1306 | drbd_err(device, "Out of sync: start=%llu, size=%lu (sectors)\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1307 | (unsigned long long)device->ov_last_oos_start, |
| 1308 | (unsigned long)device->ov_last_oos_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1309 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1310 | device->ov_last_oos_size = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1311 | } |
| 1312 | |
| 1313 | |
Andreas Gruenbacher | 79a3c8d | 2011-08-09 02:49:01 +0200 | [diff] [blame] | 1314 | extern void drbd_csum_bio(struct crypto_hash *, struct bio *, void *); |
| 1315 | extern void drbd_csum_ee(struct crypto_hash *, struct drbd_peer_request *, void *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1316 | /* worker callbacks */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1317 | extern int w_e_end_data_req(struct drbd_work *, int); |
| 1318 | extern int w_e_end_rsdata_req(struct drbd_work *, int); |
| 1319 | extern int w_e_end_csum_rs_req(struct drbd_work *, int); |
| 1320 | extern int w_e_end_ov_reply(struct drbd_work *, int); |
| 1321 | extern int w_e_end_ov_req(struct drbd_work *, int); |
| 1322 | extern int w_ov_finished(struct drbd_work *, int); |
| 1323 | extern int w_resync_timer(struct drbd_work *, int); |
| 1324 | extern int w_send_write_hint(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1325 | extern int w_send_dblock(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1326 | extern int w_send_read_req(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1327 | extern int w_e_reissue(struct drbd_work *, int); |
| 1328 | extern int w_restart_disk_io(struct drbd_work *, int); |
Andreas Gruenbacher | 8f7bed7 | 2010-12-19 23:53:14 +0100 | [diff] [blame] | 1329 | extern int w_send_out_of_sync(struct drbd_work *, int); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1330 | extern int w_start_resync(struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1331 | |
| 1332 | extern void resync_timer_fn(unsigned long data); |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 1333 | extern void start_resync_timer_fn(unsigned long data); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1334 | |
| 1335 | /* drbd_receiver.c */ |
Andreas Gruenbacher | 753c6191 | 2011-07-22 11:14:41 +0200 | [diff] [blame] | 1336 | extern int drbd_receiver(struct drbd_thread *thi); |
| 1337 | extern int drbd_asender(struct drbd_thread *thi); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1338 | extern int drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1339 | extern int drbd_submit_peer_request(struct drbd_device *, |
Andreas Gruenbacher | fbe29de | 2011-02-17 16:38:35 +0100 | [diff] [blame] | 1340 | struct drbd_peer_request *, const unsigned, |
| 1341 | const int); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1342 | extern int drbd_free_peer_reqs(struct drbd_device *, struct list_head *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1343 | 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] | 1344 | sector_t, unsigned int, |
| 1345 | gfp_t) __must_hold(local); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1346 | 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] | 1347 | int); |
| 1348 | #define drbd_free_peer_req(m,e) __drbd_free_peer_req(m, e, 0) |
| 1349 | #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] | 1350 | 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] | 1351 | extern void drbd_set_recv_tcq(struct drbd_device *device, int tcq_enabled); |
| 1352 | 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] | 1353 | extern int drbd_connected(struct drbd_peer_device *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1354 | |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1355 | /* Yes, there is kernel_setsockopt, but only since 2.6.18. |
| 1356 | * So we have our own copy of it here. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1357 | static inline int drbd_setsockopt(struct socket *sock, int level, int optname, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1358 | char *optval, int optlen) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1359 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1360 | mm_segment_t oldfs = get_fs(); |
| 1361 | char __user *uoptval; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1362 | int err; |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1363 | |
| 1364 | uoptval = (char __user __force *)optval; |
| 1365 | |
| 1366 | set_fs(KERNEL_DS); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1367 | if (level == SOL_SOCKET) |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1368 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1369 | else |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1370 | err = sock->ops->setsockopt(sock, level, optname, uoptval, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1371 | optlen); |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1372 | set_fs(oldfs); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1373 | return err; |
| 1374 | } |
| 1375 | |
| 1376 | static inline void drbd_tcp_cork(struct socket *sock) |
| 1377 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1378 | int val = 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1379 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1380 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1381 | } |
| 1382 | |
| 1383 | static inline void drbd_tcp_uncork(struct socket *sock) |
| 1384 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1385 | int val = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1386 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1387 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1388 | } |
| 1389 | |
| 1390 | static inline void drbd_tcp_nodelay(struct socket *sock) |
| 1391 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1392 | int val = 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1393 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_NODELAY, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1394 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1395 | } |
| 1396 | |
| 1397 | static inline void drbd_tcp_quickack(struct socket *sock) |
| 1398 | { |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1399 | int val = 2; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1400 | (void) drbd_setsockopt(sock, SOL_TCP, TCP_QUICKACK, |
Lars Ellenberg | ed43984 | 2011-04-23 14:45:14 +0200 | [diff] [blame] | 1401 | (char*)&val, sizeof(val)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1402 | } |
| 1403 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1404 | void drbd_bump_write_ordering(struct drbd_connection *connection, enum write_ordering_e wo); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1405 | |
| 1406 | /* drbd_proc.c */ |
| 1407 | extern struct proc_dir_entry *drbd_proc; |
Emese Revfy | 7d4e9d0 | 2009-12-14 00:59:30 +0100 | [diff] [blame] | 1408 | extern const struct file_operations drbd_proc_fops; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1409 | extern const char *drbd_conn_str(enum drbd_conns s); |
| 1410 | extern const char *drbd_role_str(enum drbd_role s); |
| 1411 | |
| 1412 | /* drbd_actlog.c */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1413 | extern int drbd_al_begin_io_nonblock(struct drbd_device *device, struct drbd_interval *i); |
| 1414 | extern void drbd_al_begin_io_commit(struct drbd_device *device, bool delegate); |
| 1415 | extern bool drbd_al_begin_io_fastpath(struct drbd_device *device, struct drbd_interval *i); |
| 1416 | extern void drbd_al_begin_io(struct drbd_device *device, struct drbd_interval *i, bool delegate); |
| 1417 | extern void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i); |
| 1418 | extern void drbd_rs_complete_io(struct drbd_device *device, sector_t sector); |
| 1419 | extern int drbd_rs_begin_io(struct drbd_device *device, sector_t sector); |
| 1420 | extern int drbd_try_rs_begin_io(struct drbd_device *device, sector_t sector); |
| 1421 | extern void drbd_rs_cancel_all(struct drbd_device *device); |
| 1422 | extern int drbd_rs_del_all(struct drbd_device *device); |
| 1423 | extern void drbd_rs_failed_io(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1424 | sector_t sector, int size); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1425 | extern void drbd_advance_rs_marks(struct drbd_device *device, unsigned long still_to_go); |
| 1426 | extern void __drbd_set_in_sync(struct drbd_device *device, sector_t sector, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1427 | int size, const char *file, const unsigned int line); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1428 | #define drbd_set_in_sync(device, sector, size) \ |
| 1429 | __drbd_set_in_sync(device, sector, size, __FILE__, __LINE__) |
| 1430 | extern int __drbd_set_out_of_sync(struct drbd_device *device, sector_t sector, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1431 | int size, const char *file, const unsigned int line); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1432 | #define drbd_set_out_of_sync(device, sector, size) \ |
| 1433 | __drbd_set_out_of_sync(device, sector, size, __FILE__, __LINE__) |
| 1434 | extern void drbd_al_shrink(struct drbd_device *device); |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1435 | extern int drbd_initialize_al(struct drbd_device *, void *); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1436 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1437 | /* drbd_nl.c */ |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 1438 | /* state info broadcast */ |
| 1439 | struct sib_info { |
| 1440 | enum drbd_state_info_bcast_reason sib_reason; |
| 1441 | union { |
| 1442 | struct { |
| 1443 | char *helper_name; |
| 1444 | unsigned helper_exit_code; |
| 1445 | }; |
| 1446 | struct { |
| 1447 | union drbd_state os; |
| 1448 | union drbd_state ns; |
| 1449 | }; |
| 1450 | }; |
| 1451 | }; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1452 | 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] | 1453 | |
| 1454 | /* |
| 1455 | * inline helper functions |
| 1456 | *************************/ |
| 1457 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1458 | /* see also page_chain_add and friends in drbd_receiver.c */ |
| 1459 | static inline struct page *page_chain_next(struct page *page) |
| 1460 | { |
| 1461 | return (struct page *)page_private(page); |
| 1462 | } |
| 1463 | #define page_chain_for_each(page) \ |
| 1464 | for (; page && ({ prefetch(page_chain_next(page)); 1; }); \ |
| 1465 | page = page_chain_next(page)) |
| 1466 | #define page_chain_for_each_safe(page, n) \ |
| 1467 | for (; page && ({ n = page_chain_next(page); 1; }); page = n) |
| 1468 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1469 | |
Andreas Gruenbacher | 045417f | 2011-04-07 21:34:24 +0200 | [diff] [blame] | 1470 | 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] | 1471 | { |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1472 | struct page *page = peer_req->pages; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1473 | page_chain_for_each(page) { |
| 1474 | if (page_count(page) > 1) |
| 1475 | return 1; |
| 1476 | } |
| 1477 | return 0; |
| 1478 | } |
| 1479 | |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1480 | static inline enum drbd_state_rv |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1481 | _drbd_set_state(struct drbd_device *device, union drbd_state ns, |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1482 | enum chg_state_flags flags, struct completion *done) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1483 | { |
Andreas Gruenbacher | bf885f8 | 2010-12-08 00:39:32 +0100 | [diff] [blame] | 1484 | enum drbd_state_rv rv; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1485 | |
| 1486 | read_lock(&global_state_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1487 | rv = __drbd_set_state(device, ns, flags, done); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1488 | read_unlock(&global_state_lock); |
| 1489 | |
| 1490 | return rv; |
| 1491 | } |
| 1492 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1493 | static inline union drbd_state drbd_read_state(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1494 | { |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 1495 | struct drbd_resource *resource = device->resource; |
Philipp Reisner | 78bae59 | 2011-03-28 15:40:12 +0200 | [diff] [blame] | 1496 | union drbd_state rv; |
| 1497 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1498 | rv.i = device->state.i; |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 1499 | rv.susp = resource->susp; |
| 1500 | rv.susp_nod = resource->susp_nod; |
| 1501 | rv.susp_fen = resource->susp_fen; |
Philipp Reisner | 78bae59 | 2011-03-28 15:40:12 +0200 | [diff] [blame] | 1502 | |
| 1503 | return rv; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1504 | } |
| 1505 | |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1506 | enum drbd_force_detach_flags { |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1507 | DRBD_READ_ERROR, |
| 1508 | DRBD_WRITE_ERROR, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1509 | DRBD_META_IO_ERROR, |
| 1510 | DRBD_FORCE_DETACH, |
| 1511 | }; |
| 1512 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1513 | #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] | 1514 | static inline void __drbd_chk_io_error_(struct drbd_device *device, |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1515 | enum drbd_force_detach_flags df, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1516 | const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1517 | { |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1518 | enum drbd_io_error_p ep; |
| 1519 | |
| 1520 | rcu_read_lock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1521 | ep = rcu_dereference(device->ldev->disk_conf)->on_io_error; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1522 | rcu_read_unlock(); |
| 1523 | switch (ep) { |
| 1524 | case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */ |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1525 | if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) { |
Lars Ellenberg | 7383506 | 2010-05-27 11:51:56 +0200 | [diff] [blame] | 1526 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1527 | drbd_err(device, "Local IO failed in %s.\n", where); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1528 | if (device->state.disk > D_INCONSISTENT) |
| 1529 | _drbd_set_state(_NS(device, disk, D_INCONSISTENT), CS_HARD, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1530 | break; |
| 1531 | } |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1532 | /* NOTE fall through for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1533 | case EP_DETACH: |
| 1534 | case EP_CALL_HELPER: |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1535 | /* Remember whether we saw a READ or WRITE error. |
| 1536 | * |
| 1537 | * Recovery of the affected area for WRITE failure is covered |
| 1538 | * by the activity log. |
| 1539 | * READ errors may fall outside that area though. Certain READ |
| 1540 | * errors can be "healed" by writing good data to the affected |
| 1541 | * blocks, which triggers block re-allocation in lower layers. |
| 1542 | * |
| 1543 | * If we can not write the bitmap after a READ error, |
| 1544 | * we may need to trigger a full sync (see w_go_diskless()). |
| 1545 | * |
| 1546 | * Force-detach is not really an IO error, but rather a |
| 1547 | * desperate measure to try to deal with a completely |
| 1548 | * unresponsive lower level IO stack. |
| 1549 | * Still it should be treated as a WRITE error. |
| 1550 | * |
| 1551 | * Meta IO error is always WRITE error: |
| 1552 | * we read meta data only once during attach, |
| 1553 | * which will fail in case of errors. |
| 1554 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1555 | set_bit(WAS_IO_ERROR, &device->flags); |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1556 | if (df == DRBD_READ_ERROR) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1557 | set_bit(WAS_READ_ERROR, &device->flags); |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 1558 | if (df == DRBD_FORCE_DETACH) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1559 | set_bit(FORCE_DETACH, &device->flags); |
| 1560 | if (device->state.disk > D_FAILED) { |
| 1561 | _drbd_set_state(_NS(device, disk, D_FAILED), CS_HARD, NULL); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1562 | drbd_err(device, |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1563 | "Local IO failed in %s. Detaching...\n", where); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1564 | } |
| 1565 | break; |
| 1566 | } |
| 1567 | } |
| 1568 | |
| 1569 | /** |
| 1570 | * 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] | 1571 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1572 | * @error: Error code passed to the IO completion callback |
| 1573 | * @forcedetach: Force detach. I.e. the error happened while accessing the meta data |
| 1574 | * |
| 1575 | * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED) |
| 1576 | */ |
| 1577 | #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] | 1578 | static inline void drbd_chk_io_error_(struct drbd_device *device, |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 1579 | int error, enum drbd_force_detach_flags forcedetach, const char *where) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1580 | { |
| 1581 | if (error) { |
| 1582 | unsigned long flags; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1583 | spin_lock_irqsave(&device->resource->req_lock, flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1584 | __drbd_chk_io_error_(device, forcedetach, where); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1585 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1586 | } |
| 1587 | } |
| 1588 | |
| 1589 | |
| 1590 | /** |
| 1591 | * drbd_md_first_sector() - Returns the first sector number of the meta data area |
| 1592 | * @bdev: Meta data block device. |
| 1593 | * |
| 1594 | * BTW, for internal meta data, this happens to be the maximum capacity |
| 1595 | * we could agree upon with our peer node. |
| 1596 | */ |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1597 | 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] | 1598 | { |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1599 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1600 | case DRBD_MD_INDEX_INTERNAL: |
| 1601 | case DRBD_MD_INDEX_FLEX_INT: |
| 1602 | return bdev->md.md_offset + bdev->md.bm_offset; |
| 1603 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1604 | default: |
| 1605 | return bdev->md.md_offset; |
| 1606 | } |
| 1607 | } |
| 1608 | |
| 1609 | /** |
| 1610 | * drbd_md_last_sector() - Return the last sector number of the meta data area |
| 1611 | * @bdev: Meta data block device. |
| 1612 | */ |
| 1613 | static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev) |
| 1614 | { |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1615 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1616 | case DRBD_MD_INDEX_INTERNAL: |
| 1617 | case DRBD_MD_INDEX_FLEX_INT: |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1618 | return bdev->md.md_offset + MD_4kB_SECT -1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1619 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1620 | default: |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 1621 | return bdev->md.md_offset + bdev->md.md_size_sect -1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1622 | } |
| 1623 | } |
| 1624 | |
| 1625 | /* Returns the number of 512 byte sectors of the device */ |
| 1626 | static inline sector_t drbd_get_capacity(struct block_device *bdev) |
| 1627 | { |
| 1628 | /* return bdev ? get_capacity(bdev->bd_disk) : 0; */ |
Mike Snitzer | 77304d2 | 2010-11-08 14:39:12 +0100 | [diff] [blame] | 1629 | return bdev ? i_size_read(bdev->bd_inode) >> 9 : 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1630 | } |
| 1631 | |
| 1632 | /** |
| 1633 | * drbd_get_max_capacity() - Returns the capacity we announce to out peer |
| 1634 | * @bdev: Meta data block device. |
| 1635 | * |
| 1636 | * returns the capacity we announce to out peer. we clip ourselves at the |
| 1637 | * various MAX_SECTORS, because if we don't, current implementation will |
| 1638 | * oops sooner or later |
| 1639 | */ |
| 1640 | static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) |
| 1641 | { |
| 1642 | sector_t s; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1643 | |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1644 | switch (bdev->md.meta_dev_idx) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1645 | case DRBD_MD_INDEX_INTERNAL: |
| 1646 | case DRBD_MD_INDEX_FLEX_INT: |
| 1647 | s = drbd_get_capacity(bdev->backing_bdev) |
| 1648 | ? min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
Lars Ellenberg | 68e41a4 | 2013-03-19 18:16:45 +0100 | [diff] [blame] | 1649 | drbd_md_first_sector(bdev)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1650 | : 0; |
| 1651 | break; |
| 1652 | case DRBD_MD_INDEX_FLEX_EXT: |
| 1653 | s = min_t(sector_t, DRBD_MAX_SECTORS_FLEX, |
| 1654 | drbd_get_capacity(bdev->backing_bdev)); |
| 1655 | /* clip at maximum size the meta device can support */ |
| 1656 | s = min_t(sector_t, s, |
| 1657 | BM_EXT_TO_SECT(bdev->md.md_size_sect |
| 1658 | - bdev->md.bm_offset)); |
| 1659 | break; |
| 1660 | default: |
| 1661 | s = min_t(sector_t, DRBD_MAX_SECTORS, |
| 1662 | drbd_get_capacity(bdev->backing_bdev)); |
| 1663 | } |
| 1664 | return s; |
| 1665 | } |
| 1666 | |
| 1667 | /** |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1668 | * 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] | 1669 | * @bdev: Meta data block device. |
| 1670 | */ |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1671 | static inline sector_t drbd_md_ss(struct drbd_backing_dev *bdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1672 | { |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1673 | const int meta_dev_idx = bdev->md.meta_dev_idx; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1674 | |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1675 | if (meta_dev_idx == DRBD_MD_INDEX_FLEX_EXT) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1676 | return 0; |
Lars Ellenberg | 3a4d4eb | 2013-03-19 18:16:44 +0100 | [diff] [blame] | 1677 | |
| 1678 | /* Since drbd08, internal meta data is always "flexible". |
| 1679 | * position: last 4k aligned block of 4k size */ |
| 1680 | if (meta_dev_idx == DRBD_MD_INDEX_INTERNAL || |
| 1681 | meta_dev_idx == DRBD_MD_INDEX_FLEX_INT) |
| 1682 | return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) - 8; |
| 1683 | |
| 1684 | /* external, some index; this is the old fixed size layout */ |
| 1685 | return MD_128MB_SECT * bdev->md.meta_dev_idx; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1686 | } |
| 1687 | |
| 1688 | static inline void |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1689 | drbd_queue_work_front(struct drbd_work_queue *q, struct drbd_work *w) |
| 1690 | { |
| 1691 | unsigned long flags; |
| 1692 | spin_lock_irqsave(&q->q_lock, flags); |
| 1693 | list_add(&w->list, &q->q); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1694 | spin_unlock_irqrestore(&q->q_lock, flags); |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1695 | wake_up(&q->q_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1696 | } |
| 1697 | |
| 1698 | static inline void |
| 1699 | drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) |
| 1700 | { |
| 1701 | unsigned long flags; |
| 1702 | spin_lock_irqsave(&q->q_lock, flags); |
| 1703 | list_add_tail(&w->list, &q->q); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1704 | spin_unlock_irqrestore(&q->q_lock, flags); |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1705 | wake_up(&q->q_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1706 | } |
| 1707 | |
Andreas Gruenbacher | b5043c5 | 2011-07-28 15:56:02 +0200 | [diff] [blame] | 1708 | extern void drbd_flush_workqueue(struct drbd_work_queue *work_queue); |
| 1709 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1710 | static inline void wake_asender(struct drbd_connection *connection) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1711 | { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1712 | if (test_bit(SIGNAL_ASENDER, &connection->flags)) |
| 1713 | force_sig(DRBD_SIG, connection->asender.task); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1714 | } |
| 1715 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1716 | static inline void request_ping(struct drbd_connection *connection) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1717 | { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1718 | set_bit(SEND_PING, &connection->flags); |
| 1719 | wake_asender(connection); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1720 | } |
| 1721 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1722 | extern void *conn_prepare_command(struct drbd_connection *, struct drbd_socket *); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1723 | extern void *drbd_prepare_command(struct drbd_peer_device *, struct drbd_socket *); |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1724 | extern int conn_send_command(struct drbd_connection *, struct drbd_socket *, |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 1725 | enum drbd_packet, unsigned int, void *, |
| 1726 | unsigned int); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1727 | extern int drbd_send_command(struct drbd_peer_device *, struct drbd_socket *, |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 1728 | enum drbd_packet, unsigned int, void *, |
| 1729 | unsigned int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1730 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1731 | extern int drbd_send_ping(struct drbd_connection *connection); |
| 1732 | extern int drbd_send_ping_ack(struct drbd_connection *connection); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1733 | 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] | 1734 | 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] | 1735 | |
| 1736 | static inline void drbd_thread_stop(struct drbd_thread *thi) |
| 1737 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1738 | _drbd_thread_stop(thi, false, true); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1739 | } |
| 1740 | |
| 1741 | static inline void drbd_thread_stop_nowait(struct drbd_thread *thi) |
| 1742 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1743 | _drbd_thread_stop(thi, false, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1744 | } |
| 1745 | |
| 1746 | static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) |
| 1747 | { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1748 | _drbd_thread_stop(thi, true, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1749 | } |
| 1750 | |
| 1751 | /* counts how many answer packets packets we expect from our peer, |
| 1752 | * for either explicit application requests, |
| 1753 | * or implicit barrier packets as necessary. |
| 1754 | * increased: |
| 1755 | * w_send_barrier |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1756 | * _req_mod(req, QUEUE_FOR_NET_WRITE or QUEUE_FOR_NET_READ); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1757 | * it is much easier and equally valid to count what we queue for the |
| 1758 | * worker, even before it actually was queued or send. |
| 1759 | * (drbd_make_request_common; recovery path on read io-error) |
| 1760 | * decreased: |
| 1761 | * got_BarrierAck (respective tl_clear, tl_clear_barrier) |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1762 | * _req_mod(req, DATA_RECEIVED) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1763 | * [from receive_DataReply] |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1764 | * _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] | 1765 | * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)] |
| 1766 | * for some reason it is NOT decreased in got_NegAck, |
| 1767 | * but in the resulting cleanup code from report_params. |
| 1768 | * we should try to remember the reason for that... |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1769 | * _req_mod(req, SEND_FAILED or SEND_CANCELED) |
| 1770 | * _req_mod(req, CONNECTION_LOST_WHILE_PENDING) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1771 | * [from tl_clear_barrier] |
| 1772 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1773 | static inline void inc_ap_pending(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1774 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1775 | atomic_inc(&device->ap_pending_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1776 | } |
| 1777 | |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1778 | #define ERR_IF_CNT_IS_NEGATIVE(which, func, line) \ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1779 | if (atomic_read(&device->which) < 0) \ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1780 | drbd_err(device, "in %s:%d: " #which " = %d < 0 !\n", \ |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1781 | func, line, \ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1782 | atomic_read(&device->which)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1783 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1784 | #define dec_ap_pending(device) _dec_ap_pending(device, __FUNCTION__, __LINE__) |
| 1785 | 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] | 1786 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1787 | if (atomic_dec_and_test(&device->ap_pending_cnt)) |
| 1788 | wake_up(&device->misc_wait); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1789 | ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt, func, line); |
| 1790 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1791 | |
| 1792 | /* counts how many resync-related answers we still expect from the peer |
| 1793 | * increase decrease |
| 1794 | * 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] | 1795 | * 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] | 1796 | * (or P_NEG_ACK with ID_SYNCER) |
| 1797 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1798 | static inline void inc_rs_pending(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1799 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1800 | atomic_inc(&device->rs_pending_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1801 | } |
| 1802 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1803 | #define dec_rs_pending(device) _dec_rs_pending(device, __FUNCTION__, __LINE__) |
| 1804 | 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] | 1805 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1806 | atomic_dec(&device->rs_pending_cnt); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1807 | ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt, func, line); |
| 1808 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1809 | |
| 1810 | /* counts how many answers we still need to send to the peer. |
| 1811 | * increased on |
| 1812 | * receive_Data unless protocol A; |
| 1813 | * we need to send a P_RECV_ACK (proto B) |
| 1814 | * or P_WRITE_ACK (proto C) |
| 1815 | * receive_RSDataReply (recv_resync_read) we need to send a P_WRITE_ACK |
| 1816 | * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA |
| 1817 | * receive_Barrier_* we need to send a P_BARRIER_ACK |
| 1818 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1819 | static inline void inc_unacked(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1820 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1821 | atomic_inc(&device->unacked_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1822 | } |
| 1823 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1824 | #define dec_unacked(device) _dec_unacked(device, __FUNCTION__, __LINE__) |
| 1825 | 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] | 1826 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1827 | atomic_dec(&device->unacked_cnt); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1828 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1829 | } |
| 1830 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1831 | #define sub_unacked(device, n) _sub_unacked(device, n, __FUNCTION__, __LINE__) |
| 1832 | 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] | 1833 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1834 | atomic_sub(n, &device->unacked_cnt); |
Philipp Reisner | 49559d8 | 2011-02-21 14:19:44 +0100 | [diff] [blame] | 1835 | ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1836 | } |
| 1837 | |
| 1838 | /** |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1839 | * get_ldev() - Increase the ref count on device->ldev. Returns 0 if there is no ldev |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1840 | * @M: DRBD device. |
| 1841 | * |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1842 | * You have to call put_ldev() when finished working with device->ldev. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1843 | */ |
| 1844 | #define get_ldev(M) __cond_lock(local, _get_ldev_if_state(M,D_INCONSISTENT)) |
| 1845 | #define get_ldev_if_state(M,MINS) __cond_lock(local, _get_ldev_if_state(M,MINS)) |
| 1846 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1847 | static inline void put_ldev(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1848 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1849 | int i = atomic_dec_return(&device->local_cnt); |
Lars Ellenberg | 9a0d9d0 | 2011-05-02 11:51:31 +0200 | [diff] [blame] | 1850 | |
| 1851 | /* This may be called from some endio handler, |
| 1852 | * so we must not sleep here. */ |
| 1853 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1854 | __release(local); |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1855 | D_ASSERT(device, i >= 0); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 1856 | if (i == 0) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1857 | if (device->state.disk == D_DISKLESS) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1858 | /* even internal references gone, safe to destroy */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1859 | drbd_ldev_destroy(device); |
| 1860 | if (device->state.disk == D_FAILED) { |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1861 | /* all application IO references gone. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1862 | if (!test_and_set_bit(GO_DISKLESS, &device->flags)) |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1863 | drbd_queue_work(&first_peer_device(device)->connection->sender_work, |
| 1864 | &device->go_diskless); |
Lars Ellenberg | 9114d795 | 2013-03-19 18:16:42 +0100 | [diff] [blame] | 1865 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1866 | wake_up(&device->misc_wait); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 1867 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1868 | } |
| 1869 | |
| 1870 | #ifndef __CHECKER__ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1871 | 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] | 1872 | { |
| 1873 | int io_allowed; |
| 1874 | |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1875 | /* never get a reference while D_DISKLESS */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1876 | if (device->state.disk == D_DISKLESS) |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 1877 | return 0; |
| 1878 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1879 | atomic_inc(&device->local_cnt); |
| 1880 | io_allowed = (device->state.disk >= mins); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1881 | if (!io_allowed) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1882 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1883 | return io_allowed; |
| 1884 | } |
| 1885 | #else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1886 | 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] | 1887 | #endif |
| 1888 | |
| 1889 | /* you must have an "get_ldev" reference */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1890 | static inline void drbd_get_syncer_progress(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1891 | unsigned long *bits_left, unsigned int *per_mil_done) |
| 1892 | { |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1893 | /* this is to break it at compile time when we change that, in case we |
| 1894 | * want to support more than (1<<32) bits on a 32bit arch. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1895 | typecheck(unsigned long, device->rs_total); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1896 | |
| 1897 | /* note: both rs_total and rs_left are in bits, i.e. in |
| 1898 | * units of BM_BLOCK_SIZE. |
| 1899 | * for the percentage, we don't care. */ |
| 1900 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1901 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
| 1902 | *bits_left = device->ov_left; |
Lars Ellenberg | 439d595 | 2010-11-05 09:52:46 +0100 | [diff] [blame] | 1903 | else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1904 | *bits_left = drbd_bm_total_weight(device) - device->rs_failed; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1905 | /* >> 10 to prevent overflow, |
| 1906 | * +1 to prevent division by zero */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1907 | if (*bits_left > device->rs_total) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1908 | /* doh. maybe a logic bug somewhere. |
| 1909 | * may also be just a race condition |
| 1910 | * between this and a disconnect during sync. |
| 1911 | * for now, just prevent in-kernel buffer overflow. |
| 1912 | */ |
| 1913 | smp_rmb(); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1914 | drbd_warn(device, "cs:%s rs_left=%lu > rs_total=%lu (rs_failed %lu)\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1915 | drbd_conn_str(device->state.conn), |
| 1916 | *bits_left, device->rs_total, device->rs_failed); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1917 | *per_mil_done = 0; |
| 1918 | } else { |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1919 | /* Make sure the division happens in long context. |
| 1920 | * We allow up to one petabyte storage right now, |
| 1921 | * at a granularity of 4k per bit that is 2**38 bits. |
| 1922 | * After shift right and multiplication by 1000, |
| 1923 | * this should still fit easily into a 32bit long, |
| 1924 | * so we don't need a 64bit division on 32bit arch. |
| 1925 | * Note: currently we don't support such large bitmaps on 32bit |
| 1926 | * arch anyways, but no harm done to be prepared for it here. |
| 1927 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1928 | unsigned int shift = device->rs_total > UINT_MAX ? 16 : 10; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1929 | unsigned long left = *bits_left >> shift; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1930 | unsigned long total = 1UL + (device->rs_total >> shift); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1931 | unsigned long tmp = 1000UL - left * 1000UL/total; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1932 | *per_mil_done = tmp; |
| 1933 | } |
| 1934 | } |
| 1935 | |
| 1936 | |
| 1937 | /* this throttles on-the-fly application requests |
| 1938 | * according to max_buffers settings; |
| 1939 | * maybe re-implement using semaphores? */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1940 | static inline int drbd_get_max_buffers(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1941 | { |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 1942 | struct net_conf *nc; |
| 1943 | int mxb; |
| 1944 | |
| 1945 | rcu_read_lock(); |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1946 | nc = rcu_dereference(first_peer_device(device)->connection->net_conf); |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 1947 | mxb = nc ? nc->max_buffers : 1000000; /* arbitrary limit on open requests */ |
| 1948 | rcu_read_unlock(); |
| 1949 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1950 | return mxb; |
| 1951 | } |
| 1952 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1953 | static inline int drbd_state_is_stable(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1954 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1955 | union drbd_dev_state s = device->state; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1956 | |
| 1957 | /* DO NOT add a default clause, we want the compiler to warn us |
| 1958 | * for any newly introduced state we may have forgotten to add here */ |
| 1959 | |
| 1960 | switch ((enum drbd_conns)s.conn) { |
| 1961 | /* new io only accepted when there is no connection, ... */ |
| 1962 | case C_STANDALONE: |
| 1963 | case C_WF_CONNECTION: |
| 1964 | /* ... or there is a well established connection. */ |
| 1965 | case C_CONNECTED: |
| 1966 | case C_SYNC_SOURCE: |
| 1967 | case C_SYNC_TARGET: |
| 1968 | case C_VERIFY_S: |
| 1969 | case C_VERIFY_T: |
| 1970 | case C_PAUSED_SYNC_S: |
| 1971 | case C_PAUSED_SYNC_T: |
Philipp Reisner | 6753171 | 2010-10-27 12:21:30 +0200 | [diff] [blame] | 1972 | case C_AHEAD: |
| 1973 | case C_BEHIND: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 1974 | /* transitional states, IO allowed */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1975 | case C_DISCONNECTING: |
| 1976 | case C_UNCONNECTED: |
| 1977 | case C_TIMEOUT: |
| 1978 | case C_BROKEN_PIPE: |
| 1979 | case C_NETWORK_FAILURE: |
| 1980 | case C_PROTOCOL_ERROR: |
| 1981 | case C_TEAR_DOWN: |
| 1982 | case C_WF_REPORT_PARAMS: |
| 1983 | case C_STARTING_SYNC_S: |
| 1984 | case C_STARTING_SYNC_T: |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 1985 | break; |
| 1986 | |
| 1987 | /* Allow IO in BM exchange states with new protocols */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1988 | case C_WF_BITMAP_S: |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1989 | if (first_peer_device(device)->connection->agreed_pro_version < 96) |
Philipp Reisner | 3719094 | 2010-11-10 12:08:37 +0100 | [diff] [blame] | 1990 | return 0; |
| 1991 | break; |
| 1992 | |
| 1993 | /* no new io accepted in these states */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1994 | case C_WF_BITMAP_T: |
| 1995 | case C_WF_SYNC_UUID: |
| 1996 | case C_MASK: |
| 1997 | /* not "stable" */ |
| 1998 | return 0; |
| 1999 | } |
| 2000 | |
| 2001 | switch ((enum drbd_disk_state)s.disk) { |
| 2002 | case D_DISKLESS: |
| 2003 | case D_INCONSISTENT: |
| 2004 | case D_OUTDATED: |
| 2005 | case D_CONSISTENT: |
| 2006 | case D_UP_TO_DATE: |
Philipp Reisner | 5ca1de0 | 2011-06-28 17:01:19 +0200 | [diff] [blame] | 2007 | case D_FAILED: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2008 | /* disk state is stable as well. */ |
| 2009 | break; |
| 2010 | |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 2011 | /* no new io accepted during transitional states */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2012 | case D_ATTACHING: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2013 | case D_NEGOTIATING: |
| 2014 | case D_UNKNOWN: |
| 2015 | case D_MASK: |
| 2016 | /* not "stable" */ |
| 2017 | return 0; |
| 2018 | } |
| 2019 | |
| 2020 | return 1; |
| 2021 | } |
| 2022 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2023 | static inline int drbd_suspended(struct drbd_device *device) |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2024 | { |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 2025 | struct drbd_resource *resource = device->resource; |
Philipp Reisner | 8e0af25 | 2011-03-28 16:18:39 +0200 | [diff] [blame] | 2026 | |
Andreas Gruenbacher | 6bbf53c | 2011-07-08 01:19:44 +0200 | [diff] [blame] | 2027 | return resource->susp || resource->susp_fen || resource->susp_nod; |
Philipp Reisner | fb22c40 | 2010-09-08 23:20:21 +0200 | [diff] [blame] | 2028 | } |
| 2029 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2030 | static inline bool may_inc_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2031 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2032 | int mxb = drbd_get_max_buffers(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2033 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2034 | if (drbd_suspended(device)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2035 | return false; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2036 | if (test_bit(SUSPEND_IO, &device->flags)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2037 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2038 | |
| 2039 | /* to avoid potential deadlock or bitmap corruption, |
| 2040 | * in various places, we only allow new application io |
| 2041 | * to start during "stable" states. */ |
| 2042 | |
| 2043 | /* no new io accepted when attaching or detaching the disk */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2044 | if (!drbd_state_is_stable(device)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2045 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2046 | |
| 2047 | /* since some older kernels don't have atomic_add_unless, |
| 2048 | * and we are within the spinlock anyways, we have this workaround. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2049 | if (atomic_read(&device->ap_bio_cnt) > mxb) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2050 | return false; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2051 | if (test_bit(BITMAP_IO, &device->flags)) |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2052 | return false; |
| 2053 | return true; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2054 | } |
| 2055 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2056 | static inline bool inc_ap_bio_cond(struct drbd_device *device) |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2057 | { |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2058 | bool rv = false; |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2059 | |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 2060 | spin_lock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2061 | rv = may_inc_ap_bio(device); |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2062 | if (rv) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2063 | atomic_inc(&device->ap_bio_cnt); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 2064 | spin_unlock_irq(&device->resource->req_lock); |
Philipp Reisner | 8869d68 | 2010-11-17 18:24:19 +0100 | [diff] [blame] | 2065 | |
| 2066 | return rv; |
| 2067 | } |
| 2068 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2069 | static inline void inc_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2070 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2071 | /* we wait here |
| 2072 | * as long as the device is suspended |
| 2073 | * until the bitmap is no longer on the fly during connection |
Philipp Reisner | d942ae4 | 2011-05-31 13:07:24 +0200 | [diff] [blame] | 2074 | * handshake as long as we would exceed the max_buffer limit. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2075 | * |
| 2076 | * to avoid races with the reconnect code, |
| 2077 | * we need to atomic_inc within the spinlock. */ |
| 2078 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2079 | wait_event(device->misc_wait, inc_ap_bio_cond(device)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2080 | } |
| 2081 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2082 | static inline void dec_ap_bio(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2083 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2084 | int mxb = drbd_get_max_buffers(device); |
| 2085 | int ap_bio = atomic_dec_return(&device->ap_bio_cnt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2086 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 2087 | D_ASSERT(device, ap_bio >= 0); |
Lars Ellenberg | 7ee1fb9 | 2012-06-19 10:27:58 +0200 | [diff] [blame] | 2088 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2089 | if (ap_bio == 0 && test_bit(BITMAP_IO, &device->flags)) { |
| 2090 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags)) |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 2091 | drbd_queue_work(&first_peer_device(device)-> |
| 2092 | connection->sender_work, |
| 2093 | &device->bm_io_work.w); |
Lars Ellenberg | 7ee1fb9 | 2012-06-19 10:27:58 +0200 | [diff] [blame] | 2094 | } |
| 2095 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2096 | /* this currently does wake_up for every dec_ap_bio! |
| 2097 | * maybe rather introduce some type of hysteresis? |
| 2098 | * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ |
| 2099 | if (ap_bio < mxb) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2100 | wake_up(&device->misc_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2101 | } |
| 2102 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2103 | static inline bool verify_can_do_stop_sector(struct drbd_device *device) |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 2104 | { |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 2105 | return first_peer_device(device)->connection->agreed_pro_version >= 97 && |
| 2106 | first_peer_device(device)->connection->agreed_pro_version != 100; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 2107 | } |
| 2108 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2109 | 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] | 2110 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2111 | int changed = device->ed_uuid != val; |
| 2112 | device->ed_uuid = val; |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 2113 | return changed; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2114 | } |
| 2115 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2116 | static inline int drbd_queue_order_type(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2117 | { |
| 2118 | /* sorry, we currently have no working implementation |
| 2119 | * of distributed TCQ stuff */ |
| 2120 | #ifndef QUEUE_ORDERED_NONE |
| 2121 | #define QUEUE_ORDERED_NONE 0 |
| 2122 | #endif |
| 2123 | return QUEUE_ORDERED_NONE; |
| 2124 | } |
| 2125 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2126 | static inline void drbd_md_flush(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2127 | { |
| 2128 | int r; |
| 2129 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2130 | if (device->ldev == NULL) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 2131 | drbd_warn(device, "device->ldev == NULL in drbd_md_flush\n"); |
Philipp Reisner | fd0017c | 2012-10-19 14:19:23 +0200 | [diff] [blame] | 2132 | return; |
| 2133 | } |
| 2134 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2135 | if (test_bit(MD_NO_FUA, &device->flags)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2136 | return; |
| 2137 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2138 | r = blkdev_issue_flush(device->ldev->md_bdev, GFP_NOIO, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2139 | if (r) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 2140 | set_bit(MD_NO_FUA, &device->flags); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 2141 | drbd_err(device, "meta data flush failed with status %d, disabling md-flushes\n", r); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2142 | } |
| 2143 | } |
| 2144 | |
Andreas Gruenbacher | 77c556f | 2011-06-08 22:17:38 +0200 | [diff] [blame] | 2145 | static inline struct drbd_connection *first_connection(struct drbd_resource *resource) |
| 2146 | { |
| 2147 | return list_first_entry(&resource->connections, |
| 2148 | struct drbd_connection, connections); |
| 2149 | } |
| 2150 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2151 | #endif |