Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | drbd_worker.c |
| 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 | |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 24 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 25 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 26 | #include <linux/module.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 27 | #include <linux/drbd.h> |
| 28 | #include <linux/sched.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 29 | #include <linux/wait.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/memcontrol.h> |
| 32 | #include <linux/mm_inline.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/random.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 35 | #include <linux/string.h> |
| 36 | #include <linux/scatterlist.h> |
| 37 | |
| 38 | #include "drbd_int.h" |
Andreas Gruenbacher | a3603a6 | 2011-05-30 11:47:37 +0200 | [diff] [blame] | 39 | #include "drbd_protocol.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 40 | #include "drbd_req.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 41 | |
Andreas Gruenbacher | d448a2e | 2011-08-25 16:59:58 +0200 | [diff] [blame] | 42 | static int make_ov_request(struct drbd_device *, int); |
| 43 | static int make_resync_request(struct drbd_device *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 44 | |
Andreas Gruenbacher | c5a9161 | 2011-01-25 17:33:38 +0100 | [diff] [blame] | 45 | /* endio handlers: |
| 46 | * drbd_md_io_complete (defined here) |
Andreas Gruenbacher | fcefa62 | 2011-02-17 16:46:59 +0100 | [diff] [blame] | 47 | * drbd_request_endio (defined here) |
| 48 | * drbd_peer_request_endio (defined here) |
Andreas Gruenbacher | c5a9161 | 2011-01-25 17:33:38 +0100 | [diff] [blame] | 49 | * bm_async_io_complete (defined in drbd_bitmap.c) |
| 50 | * |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 51 | * For all these callbacks, note the following: |
| 52 | * The callbacks will be called in irq context by the IDE drivers, |
| 53 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. |
| 54 | * Try to get the locking right :) |
| 55 | * |
| 56 | */ |
| 57 | |
| 58 | |
| 59 | /* About the global_state_lock |
| 60 | Each state transition on an device holds a read lock. In case we have |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 61 | to evaluate the resync after dependencies, we grab a write lock, because |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 62 | we need stable states on all devices for that. */ |
| 63 | rwlock_t global_state_lock; |
| 64 | |
| 65 | /* used for synchronous meta data and bitmap IO |
| 66 | * submitted by drbd_md_sync_page_io() |
| 67 | */ |
| 68 | void drbd_md_io_complete(struct bio *bio, int error) |
| 69 | { |
| 70 | struct drbd_md_io *md_io; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 71 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 72 | |
| 73 | md_io = (struct drbd_md_io *)bio->bi_private; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 74 | device = container_of(md_io, struct drbd_device, md_io); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 75 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 76 | md_io->error = error; |
| 77 | |
Philipp Reisner | 0cfac5d | 2011-11-10 12:12:52 +0100 | [diff] [blame] | 78 | /* We grabbed an extra reference in _drbd_md_sync_page_io() to be able |
| 79 | * to timeout on the lower level device, and eventually detach from it. |
| 80 | * If this io completion runs after that timeout expired, this |
| 81 | * drbd_md_put_buffer() may allow us to finally try and re-attach. |
| 82 | * During normal operation, this only puts that extra reference |
| 83 | * down to 1 again. |
| 84 | * Make sure we first drop the reference, and only then signal |
| 85 | * completion, or we may (in drbd_al_read_log()) cycle so fast into the |
| 86 | * next drbd_md_sync_page_io(), that we trigger the |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 87 | * ASSERT(atomic_read(&device->md_io_in_use) == 1) there. |
Philipp Reisner | 0cfac5d | 2011-11-10 12:12:52 +0100 | [diff] [blame] | 88 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 89 | drbd_md_put_buffer(device); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 90 | md_io->done = 1; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 91 | wake_up(&device->misc_wait); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 92 | bio_put(bio); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 93 | if (device->ldev) /* special case: drbd_md_read() during drbd_adm_attach() */ |
| 94 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | /* reads on behalf of the partner, |
| 98 | * "submitted" by the receiver |
| 99 | */ |
Rashika Kheria | a186e47 | 2013-12-19 15:06:10 +0530 | [diff] [blame] | 100 | static void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 101 | { |
| 102 | unsigned long flags = 0; |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 103 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 104 | struct drbd_device *device = peer_device->device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 105 | |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 106 | spin_lock_irqsave(&device->resource->req_lock, flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 107 | device->read_cnt += peer_req->i.size >> 9; |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 108 | list_del(&peer_req->w.list); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 109 | if (list_empty(&device->read_ee)) |
| 110 | wake_up(&device->ee_wait); |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 111 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 112 | __drbd_chk_io_error(device, DRBD_READ_ERROR); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 113 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 114 | |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 115 | drbd_queue_work(&peer_device->connection->sender_work, &peer_req->w); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 116 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | /* writes on behalf of the partner, or resync writes, |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 120 | * "submitted" by the receiver, final stage. */ |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 121 | static void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 122 | { |
| 123 | unsigned long flags = 0; |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 124 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 125 | struct drbd_device *device = peer_device->device; |
Lars Ellenberg | 181286a | 2011-03-31 15:18:56 +0200 | [diff] [blame] | 126 | struct drbd_interval i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 127 | int do_wake; |
Andreas Gruenbacher | 579b57e | 2011-01-13 18:40:57 +0100 | [diff] [blame] | 128 | u64 block_id; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 129 | int do_al_complete_io; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 130 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 131 | /* after we moved peer_req to done_ee, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 132 | * we may no longer access it, |
| 133 | * it may be freed/reused already! |
| 134 | * (as soon as we release the req_lock) */ |
Lars Ellenberg | 181286a | 2011-03-31 15:18:56 +0200 | [diff] [blame] | 135 | i = peer_req->i; |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 136 | do_al_complete_io = peer_req->flags & EE_CALL_AL_COMPLETE_IO; |
| 137 | block_id = peer_req->block_id; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 138 | |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 139 | spin_lock_irqsave(&device->resource->req_lock, flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 140 | device->writ_cnt += peer_req->i.size >> 9; |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 141 | list_move_tail(&peer_req->w.list, &device->done_ee); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 142 | |
Andreas Gruenbacher | bb3bfe9 | 2011-01-21 15:59:23 +0100 | [diff] [blame] | 143 | /* |
Andreas Gruenbacher | 5e47226 | 2011-01-27 14:42:51 +0100 | [diff] [blame] | 144 | * Do not remove from the write_requests tree here: we did not send the |
Andreas Gruenbacher | bb3bfe9 | 2011-01-21 15:59:23 +0100 | [diff] [blame] | 145 | * Ack yet and did not wake possibly waiting conflicting requests. |
| 146 | * Removed from the tree from "drbd_process_done_ee" within the |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 147 | * appropriate dw.cb (e_end_block/e_end_resync_block) or from |
Andreas Gruenbacher | bb3bfe9 | 2011-01-21 15:59:23 +0100 | [diff] [blame] | 148 | * _drbd_clear_done_ee. |
| 149 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 150 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 151 | do_wake = list_empty(block_id == ID_SYNCER ? &device->sync_ee : &device->active_ee); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 152 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 153 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 154 | __drbd_chk_io_error(device, DRBD_WRITE_ERROR); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 155 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 156 | |
Andreas Gruenbacher | 579b57e | 2011-01-13 18:40:57 +0100 | [diff] [blame] | 157 | if (block_id == ID_SYNCER) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 158 | drbd_rs_complete_io(device, i.sector); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 159 | |
| 160 | if (do_wake) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 161 | wake_up(&device->ee_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 162 | |
| 163 | if (do_al_complete_io) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 164 | drbd_al_complete_io(device, &i); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 165 | |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 166 | wake_asender(peer_device->connection); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 167 | put_ldev(device); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 168 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 169 | |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 170 | /* writes on behalf of the partner, or resync writes, |
| 171 | * "submitted" by the receiver. |
| 172 | */ |
Andreas Gruenbacher | fcefa62 | 2011-02-17 16:46:59 +0100 | [diff] [blame] | 173 | void drbd_peer_request_endio(struct bio *bio, int error) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 174 | { |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 175 | struct drbd_peer_request *peer_req = bio->bi_private; |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 176 | struct drbd_device *device = peer_req->peer_device->device; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 177 | int uptodate = bio_flagged(bio, BIO_UPTODATE); |
| 178 | int is_write = bio_data_dir(bio) == WRITE; |
| 179 | |
Lars Ellenberg | 0719427 | 2010-12-20 15:38:07 +0100 | [diff] [blame] | 180 | if (error && __ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 181 | drbd_warn(device, "%s: error=%d s=%llus\n", |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 182 | is_write ? "write" : "read", error, |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 183 | (unsigned long long)peer_req->i.sector); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 184 | if (!error && !uptodate) { |
Lars Ellenberg | 0719427 | 2010-12-20 15:38:07 +0100 | [diff] [blame] | 185 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 186 | drbd_warn(device, "%s: setting error to -EIO s=%llus\n", |
Lars Ellenberg | 0719427 | 2010-12-20 15:38:07 +0100 | [diff] [blame] | 187 | is_write ? "write" : "read", |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 188 | (unsigned long long)peer_req->i.sector); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 189 | /* strange behavior of some lower level drivers... |
| 190 | * fail the request by clearing the uptodate flag, |
| 191 | * but do not return any error?! */ |
| 192 | error = -EIO; |
| 193 | } |
| 194 | |
| 195 | if (error) |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 196 | set_bit(__EE_WAS_ERROR, &peer_req->flags); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 197 | |
| 198 | bio_put(bio); /* no need for the bio anymore */ |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 199 | if (atomic_dec_and_test(&peer_req->pending_bios)) { |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 200 | if (is_write) |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 201 | drbd_endio_write_sec_final(peer_req); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 202 | else |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 203 | drbd_endio_read_sec_final(peer_req); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 204 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request |
| 208 | */ |
Andreas Gruenbacher | fcefa62 | 2011-02-17 16:46:59 +0100 | [diff] [blame] | 209 | void drbd_request_endio(struct bio *bio, int error) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 210 | { |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 211 | unsigned long flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 212 | struct drbd_request *req = bio->bi_private; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 213 | struct drbd_device *device = req->device; |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 214 | struct bio_and_error m; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 215 | enum drbd_req_event what; |
| 216 | int uptodate = bio_flagged(bio, BIO_UPTODATE); |
| 217 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 218 | if (!error && !uptodate) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 219 | drbd_warn(device, "p %s: setting error to -EIO\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 220 | bio_data_dir(bio) == WRITE ? "write" : "read"); |
| 221 | /* strange behavior of some lower level drivers... |
| 222 | * fail the request by clearing the uptodate flag, |
| 223 | * but do not return any error?! */ |
| 224 | error = -EIO; |
| 225 | } |
| 226 | |
Philipp Reisner | 1b6dd25 | 2012-09-04 15:16:20 +0200 | [diff] [blame] | 227 | |
| 228 | /* If this request was aborted locally before, |
| 229 | * but now was completed "successfully", |
| 230 | * chances are that this caused arbitrary data corruption. |
| 231 | * |
| 232 | * "aborting" requests, or force-detaching the disk, is intended for |
| 233 | * completely blocked/hung local backing devices which do no longer |
| 234 | * complete requests at all, not even do error completions. In this |
| 235 | * situation, usually a hard-reset and failover is the only way out. |
| 236 | * |
| 237 | * By "aborting", basically faking a local error-completion, |
| 238 | * we allow for a more graceful swichover by cleanly migrating services. |
| 239 | * Still the affected node has to be rebooted "soon". |
| 240 | * |
| 241 | * By completing these requests, we allow the upper layers to re-use |
| 242 | * the associated data pages. |
| 243 | * |
| 244 | * If later the local backing device "recovers", and now DMAs some data |
| 245 | * from disk into the original request pages, in the best case it will |
| 246 | * just put random data into unused pages; but typically it will corrupt |
| 247 | * meanwhile completely unrelated data, causing all sorts of damage. |
| 248 | * |
| 249 | * Which means delayed successful completion, |
| 250 | * especially for READ requests, |
| 251 | * is a reason to panic(). |
| 252 | * |
| 253 | * We assume that a delayed *error* completion is OK, |
| 254 | * though we still will complain noisily about it. |
| 255 | */ |
| 256 | if (unlikely(req->rq_state & RQ_LOCAL_ABORTED)) { |
| 257 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 258 | drbd_emerg(device, "delayed completion of aborted local request; disk-timeout may be too aggressive\n"); |
Philipp Reisner | 1b6dd25 | 2012-09-04 15:16:20 +0200 | [diff] [blame] | 259 | |
| 260 | if (!error) |
| 261 | panic("possible random memory corruption caused by delayed completion of aborted local request\n"); |
| 262 | } |
| 263 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 264 | /* to avoid recursion in __req_mod */ |
| 265 | if (unlikely(error)) { |
| 266 | what = (bio_data_dir(bio) == WRITE) |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 267 | ? WRITE_COMPLETED_WITH_ERROR |
Lars Ellenberg | 5c3c7e6 | 2010-04-10 02:10:09 +0200 | [diff] [blame] | 268 | : (bio_rw(bio) == READ) |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 269 | ? READ_COMPLETED_WITH_ERROR |
| 270 | : READ_AHEAD_COMPLETED_WITH_ERROR; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 271 | } else |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 272 | what = COMPLETED_OK; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 273 | |
| 274 | bio_put(req->private_bio); |
| 275 | req->private_bio = ERR_PTR(error); |
| 276 | |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 277 | /* not req_mod(), we need irqsave here! */ |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 278 | spin_lock_irqsave(&device->resource->req_lock, flags); |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 279 | __req_mod(req, what, &m); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 280 | spin_unlock_irqrestore(&device->resource->req_lock, flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 281 | put_ldev(device); |
Lars Ellenberg | a115413 | 2010-11-13 20:42:29 +0100 | [diff] [blame] | 282 | |
| 283 | if (m.bio) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 284 | complete_master_bio(device, &m); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 285 | } |
| 286 | |
Andreas Gruenbacher | 79a3c8d | 2011-08-09 02:49:01 +0200 | [diff] [blame] | 287 | void drbd_csum_ee(struct crypto_hash *tfm, struct drbd_peer_request *peer_req, void *digest) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 288 | { |
| 289 | struct hash_desc desc; |
| 290 | struct scatterlist sg; |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 291 | struct page *page = peer_req->pages; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 292 | struct page *tmp; |
| 293 | unsigned len; |
| 294 | |
| 295 | desc.tfm = tfm; |
| 296 | desc.flags = 0; |
| 297 | |
| 298 | sg_init_table(&sg, 1); |
| 299 | crypto_hash_init(&desc); |
| 300 | |
| 301 | while ((tmp = page_chain_next(page))) { |
| 302 | /* all but the last page will be fully used */ |
| 303 | sg_set_page(&sg, page, PAGE_SIZE, 0); |
| 304 | crypto_hash_update(&desc, &sg, sg.length); |
| 305 | page = tmp; |
| 306 | } |
| 307 | /* and now the last, possibly only partially used page */ |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 308 | len = peer_req->i.size & (PAGE_SIZE - 1); |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 309 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); |
| 310 | crypto_hash_update(&desc, &sg, sg.length); |
| 311 | crypto_hash_final(&desc, digest); |
| 312 | } |
| 313 | |
Andreas Gruenbacher | 79a3c8d | 2011-08-09 02:49:01 +0200 | [diff] [blame] | 314 | void drbd_csum_bio(struct crypto_hash *tfm, struct bio *bio, void *digest) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 315 | { |
| 316 | struct hash_desc desc; |
| 317 | struct scatterlist sg; |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 318 | struct bio_vec bvec; |
| 319 | struct bvec_iter iter; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 320 | |
| 321 | desc.tfm = tfm; |
| 322 | desc.flags = 0; |
| 323 | |
| 324 | sg_init_table(&sg, 1); |
| 325 | crypto_hash_init(&desc); |
| 326 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 327 | bio_for_each_segment(bvec, bio, iter) { |
| 328 | sg_set_page(&sg, bvec.bv_page, bvec.bv_len, bvec.bv_offset); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 329 | crypto_hash_update(&desc, &sg, sg.length); |
| 330 | } |
| 331 | crypto_hash_final(&desc, digest); |
| 332 | } |
| 333 | |
Lars Ellenberg | 9676c76 | 2011-02-22 14:02:31 +0100 | [diff] [blame] | 334 | /* MAYBE merge common code with w_e_end_ov_req */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 335 | static int w_e_send_csum(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 336 | { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 337 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 338 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 339 | struct drbd_device *device = peer_device->device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 340 | int digest_size; |
| 341 | void *digest; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 342 | int err = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 343 | |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 344 | if (unlikely(cancel)) |
| 345 | goto out; |
| 346 | |
Lars Ellenberg | 9676c76 | 2011-02-22 14:02:31 +0100 | [diff] [blame] | 347 | if (unlikely((peer_req->flags & EE_WAS_ERROR) != 0)) |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 348 | goto out; |
| 349 | |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 350 | digest_size = crypto_hash_digestsize(peer_device->connection->csums_tfm); |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 351 | digest = kmalloc(digest_size, GFP_NOIO); |
| 352 | if (digest) { |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 353 | sector_t sector = peer_req->i.sector; |
| 354 | unsigned int size = peer_req->i.size; |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 355 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest); |
Lars Ellenberg | 9676c76 | 2011-02-22 14:02:31 +0100 | [diff] [blame] | 356 | /* Free peer_req and pages before send. |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 357 | * In case we block on congestion, we could otherwise run into |
| 358 | * some distributed deadlock, if the other side blocks on |
| 359 | * congestion as well, because our receiver blocks in |
Andreas Gruenbacher | c37c8ec | 2011-04-07 21:02:09 +0200 | [diff] [blame] | 360 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 361 | drbd_free_peer_req(device, peer_req); |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 362 | peer_req = NULL; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 363 | inc_rs_pending(device); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 364 | err = drbd_send_drequest_csum(peer_device, sector, size, |
Andreas Gruenbacher | db1b0b7 | 2011-03-16 01:37:21 +0100 | [diff] [blame] | 365 | digest, digest_size, |
| 366 | P_CSUM_RS_REQUEST); |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 367 | kfree(digest); |
| 368 | } else { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 369 | drbd_err(device, "kmalloc() of digest failed.\n"); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 370 | err = -ENOMEM; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 373 | out: |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 374 | if (peer_req) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 375 | drbd_free_peer_req(device, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 376 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 377 | if (unlikely(err)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 378 | drbd_err(device, "drbd_send_drequest(..., csum) failed\n"); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 379 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) |
| 383 | |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 384 | static int read_for_csum(struct drbd_peer_device *peer_device, sector_t sector, int size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 385 | { |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 386 | struct drbd_device *device = peer_device->device; |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 387 | struct drbd_peer_request *peer_req; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 388 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 389 | if (!get_ldev(device)) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 390 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 391 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 392 | if (drbd_rs_should_slow_down(device, sector)) |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 393 | goto defer; |
| 394 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 395 | /* GFP_TRY, because if there is no memory available right now, this may |
| 396 | * be rescheduled for later. It is "only" background resync, after all. */ |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 397 | peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER /* unused */, sector, |
Andreas Gruenbacher | 0db5536 | 2011-04-06 16:09:15 +0200 | [diff] [blame] | 398 | size, GFP_TRY); |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 399 | if (!peer_req) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 400 | goto defer; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 401 | |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 402 | peer_req->w.cb = w_e_send_csum; |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 403 | spin_lock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 404 | list_add(&peer_req->w.list, &device->read_ee); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 405 | spin_unlock_irq(&device->resource->req_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 406 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 407 | atomic_add(size >> 9, &device->rs_sect_ev); |
| 408 | if (drbd_submit_peer_request(device, peer_req, READ, DRBD_FAULT_RS_RD) == 0) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 409 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 410 | |
Lars Ellenberg | 10f6d992 | 2011-01-24 14:47:09 +0100 | [diff] [blame] | 411 | /* If it failed because of ENOMEM, retry should help. If it failed |
| 412 | * because bio_add_page failed (probably broken lower level driver), |
| 413 | * retry may or may not help. |
| 414 | * If it does not, you may need to force disconnect. */ |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 415 | spin_lock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 416 | list_del(&peer_req->w.list); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 417 | spin_unlock_irq(&device->resource->req_lock); |
Lars Ellenberg | 22cc37a | 2010-09-14 20:40:41 +0200 | [diff] [blame] | 418 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 419 | drbd_free_peer_req(device, peer_req); |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 420 | defer: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 421 | put_ldev(device); |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 422 | return -EAGAIN; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 423 | } |
| 424 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 425 | int w_resync_timer(struct drbd_work *w, int cancel) |
Philipp Reisner | 794abb7 | 2010-12-27 11:51:23 +0100 | [diff] [blame] | 426 | { |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 427 | struct drbd_device *device = |
| 428 | container_of(w, struct drbd_device, resync_work); |
| 429 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 430 | switch (device->state.conn) { |
Philipp Reisner | 794abb7 | 2010-12-27 11:51:23 +0100 | [diff] [blame] | 431 | case C_VERIFY_S: |
Andreas Gruenbacher | d448a2e | 2011-08-25 16:59:58 +0200 | [diff] [blame] | 432 | make_ov_request(device, cancel); |
Philipp Reisner | 794abb7 | 2010-12-27 11:51:23 +0100 | [diff] [blame] | 433 | break; |
| 434 | case C_SYNC_TARGET: |
Andreas Gruenbacher | d448a2e | 2011-08-25 16:59:58 +0200 | [diff] [blame] | 435 | make_resync_request(device, cancel); |
Philipp Reisner | 794abb7 | 2010-12-27 11:51:23 +0100 | [diff] [blame] | 436 | break; |
| 437 | } |
| 438 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 439 | return 0; |
Philipp Reisner | 794abb7 | 2010-12-27 11:51:23 +0100 | [diff] [blame] | 440 | } |
| 441 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 442 | void resync_timer_fn(unsigned long data) |
| 443 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 444 | struct drbd_device *device = (struct drbd_device *) data; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 445 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 446 | if (list_empty(&device->resync_work.list)) |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 447 | drbd_queue_work(&first_peer_device(device)->connection->sender_work, |
| 448 | &device->resync_work); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 451 | static void fifo_set(struct fifo_buffer *fb, int value) |
| 452 | { |
| 453 | int i; |
| 454 | |
| 455 | for (i = 0; i < fb->size; i++) |
Philipp Reisner | f10f262 | 2010-10-05 16:50:17 +0200 | [diff] [blame] | 456 | fb->values[i] = value; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | static int fifo_push(struct fifo_buffer *fb, int value) |
| 460 | { |
| 461 | int ov; |
| 462 | |
| 463 | ov = fb->values[fb->head_index]; |
| 464 | fb->values[fb->head_index++] = value; |
| 465 | |
| 466 | if (fb->head_index >= fb->size) |
| 467 | fb->head_index = 0; |
| 468 | |
| 469 | return ov; |
| 470 | } |
| 471 | |
| 472 | static void fifo_add_val(struct fifo_buffer *fb, int value) |
| 473 | { |
| 474 | int i; |
| 475 | |
| 476 | for (i = 0; i < fb->size; i++) |
| 477 | fb->values[i] += value; |
| 478 | } |
| 479 | |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 480 | struct fifo_buffer *fifo_alloc(int fifo_size) |
| 481 | { |
| 482 | struct fifo_buffer *fb; |
| 483 | |
Lars Ellenberg | 8747d30 | 2012-09-26 14:22:40 +0200 | [diff] [blame] | 484 | fb = kzalloc(sizeof(struct fifo_buffer) + sizeof(int) * fifo_size, GFP_NOIO); |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 485 | if (!fb) |
| 486 | return NULL; |
| 487 | |
| 488 | fb->head_index = 0; |
| 489 | fb->size = fifo_size; |
| 490 | fb->total = 0; |
| 491 | |
| 492 | return fb; |
| 493 | } |
| 494 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 495 | static int drbd_rs_controller(struct drbd_device *device) |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 496 | { |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 497 | struct disk_conf *dc; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 498 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ |
| 499 | unsigned int want; /* The number of sectors we want in the proxy */ |
| 500 | int req_sect; /* Number of sectors to request in this turn */ |
| 501 | int correction; /* Number of sectors more we need in the proxy*/ |
| 502 | int cps; /* correction per invocation of drbd_rs_controller() */ |
| 503 | int steps; /* Number of time steps to plan ahead */ |
| 504 | int curr_corr; |
| 505 | int max_sect; |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 506 | struct fifo_buffer *plan; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 507 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 508 | sect_in = atomic_xchg(&device->rs_sect_in, 0); /* Number of sectors that came in */ |
| 509 | device->rs_in_flight -= sect_in; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 510 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 511 | dc = rcu_dereference(device->ldev->disk_conf); |
| 512 | plan = rcu_dereference(device->rs_plan_s); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 513 | |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 514 | steps = plan->size; /* (dc->c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 515 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 516 | if (device->rs_in_flight + sect_in == 0) { /* At start of resync */ |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 517 | want = ((dc->resync_rate * 2 * SLEEP_TIME) / HZ) * steps; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 518 | } else { /* normal path */ |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 519 | want = dc->c_fill_target ? dc->c_fill_target : |
| 520 | sect_in * dc->c_delay_target * HZ / (SLEEP_TIME * 10); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 521 | } |
| 522 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 523 | correction = want - device->rs_in_flight - plan->total; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 524 | |
| 525 | /* Plan ahead */ |
| 526 | cps = correction / steps; |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 527 | fifo_add_val(plan, cps); |
| 528 | plan->total += cps * steps; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 529 | |
| 530 | /* What we do in this step */ |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 531 | curr_corr = fifo_push(plan, 0); |
| 532 | plan->total -= curr_corr; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 533 | |
| 534 | req_sect = sect_in + curr_corr; |
| 535 | if (req_sect < 0) |
| 536 | req_sect = 0; |
| 537 | |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 538 | max_sect = (dc->c_max_rate * 2 * SLEEP_TIME) / HZ; |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 539 | if (req_sect > max_sect) |
| 540 | req_sect = max_sect; |
| 541 | |
| 542 | /* |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 543 | drbd_warn(device, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 544 | sect_in, device->rs_in_flight, want, correction, |
| 545 | steps, cps, device->rs_planed, curr_corr, req_sect); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 546 | */ |
| 547 | |
| 548 | return req_sect; |
| 549 | } |
| 550 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 551 | static int drbd_rs_number_requests(struct drbd_device *device) |
Lars Ellenberg | e65f440 | 2010-11-05 10:04:07 +0100 | [diff] [blame] | 552 | { |
| 553 | int number; |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 554 | |
| 555 | rcu_read_lock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 556 | if (rcu_dereference(device->rs_plan_s)->size) { |
| 557 | number = drbd_rs_controller(device) >> (BM_BLOCK_SHIFT - 9); |
| 558 | device->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; |
Lars Ellenberg | e65f440 | 2010-11-05 10:04:07 +0100 | [diff] [blame] | 559 | } else { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 560 | device->c_sync_rate = rcu_dereference(device->ldev->disk_conf)->resync_rate; |
| 561 | number = SLEEP_TIME * device->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); |
Lars Ellenberg | e65f440 | 2010-11-05 10:04:07 +0100 | [diff] [blame] | 562 | } |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 563 | rcu_read_unlock(); |
Lars Ellenberg | e65f440 | 2010-11-05 10:04:07 +0100 | [diff] [blame] | 564 | |
Lars Ellenberg | e65f440 | 2010-11-05 10:04:07 +0100 | [diff] [blame] | 565 | /* ignore the amount of pending requests, the resync controller should |
| 566 | * throttle down to incoming reply rate soon enough anyways. */ |
| 567 | return number; |
| 568 | } |
| 569 | |
Andreas Gruenbacher | d448a2e | 2011-08-25 16:59:58 +0200 | [diff] [blame] | 570 | static int make_resync_request(struct drbd_device *device, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 571 | { |
| 572 | unsigned long bit; |
| 573 | sector_t sector; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 574 | const sector_t capacity = drbd_get_capacity(device->this_bdev); |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 575 | int max_bio_size; |
Lars Ellenberg | e65f440 | 2010-11-05 10:04:07 +0100 | [diff] [blame] | 576 | int number, rollback_i, size; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 577 | int align, queued, sndbuf; |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 578 | int i = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 579 | |
| 580 | if (unlikely(cancel)) |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 581 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 582 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 583 | if (device->rs_total == 0) { |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 584 | /* empty resync? */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 585 | drbd_resync_finished(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 586 | return 0; |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 587 | } |
| 588 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 589 | if (!get_ldev(device)) { |
| 590 | /* Since we only need to access device->rsync a |
| 591 | get_ldev_if_state(device,D_FAILED) would be sufficient, but |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 592 | to continue resync with a broken disk makes no sense at |
| 593 | all */ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 594 | drbd_err(device, "Disk broke down during resync!\n"); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 595 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 596 | } |
| 597 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 598 | max_bio_size = queue_max_hw_sectors(device->rq_queue) << 9; |
| 599 | number = drbd_rs_number_requests(device); |
Lars Ellenberg | e65f440 | 2010-11-05 10:04:07 +0100 | [diff] [blame] | 600 | if (number == 0) |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 601 | goto requeue; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 602 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 603 | for (i = 0; i < number; i++) { |
| 604 | /* Stop generating RS requests, when half of the send buffer is filled */ |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 605 | mutex_lock(&first_peer_device(device)->connection->data.mutex); |
| 606 | if (first_peer_device(device)->connection->data.socket) { |
| 607 | queued = first_peer_device(device)->connection->data.socket->sk->sk_wmem_queued; |
| 608 | sndbuf = first_peer_device(device)->connection->data.socket->sk->sk_sndbuf; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 609 | } else { |
| 610 | queued = 1; |
| 611 | sndbuf = 0; |
| 612 | } |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 613 | mutex_unlock(&first_peer_device(device)->connection->data.mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 614 | if (queued > sndbuf / 2) |
| 615 | goto requeue; |
| 616 | |
| 617 | next_sector: |
| 618 | size = BM_BLOCK_SIZE; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 619 | bit = drbd_bm_find_next(device, device->bm_resync_fo); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 620 | |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 621 | if (bit == DRBD_END_OF_BITMAP) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 622 | device->bm_resync_fo = drbd_bm_bits(device); |
| 623 | put_ldev(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 624 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | sector = BM_BIT_TO_SECT(bit); |
| 628 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 629 | if (drbd_rs_should_slow_down(device, sector) || |
| 630 | drbd_try_rs_begin_io(device, sector)) { |
| 631 | device->bm_resync_fo = bit; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 632 | goto requeue; |
| 633 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 634 | device->bm_resync_fo = bit + 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 635 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 636 | if (unlikely(drbd_bm_test_bit(device, bit) == 0)) { |
| 637 | drbd_rs_complete_io(device, sector); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 638 | goto next_sector; |
| 639 | } |
| 640 | |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 641 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 642 | /* try to find some adjacent bits. |
| 643 | * we stop if we have already the maximum req size. |
| 644 | * |
| 645 | * Additionally always align bigger requests, in order to |
| 646 | * be prepared for all stripe sizes of software RAIDs. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 647 | */ |
| 648 | align = 1; |
Philipp Reisner | d207450 | 2010-07-22 15:27:27 +0200 | [diff] [blame] | 649 | rollback_i = i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 650 | for (;;) { |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 651 | if (size + BM_BLOCK_SIZE > max_bio_size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 652 | break; |
| 653 | |
| 654 | /* Be always aligned */ |
| 655 | if (sector & ((1<<(align+3))-1)) |
| 656 | break; |
| 657 | |
| 658 | /* do not cross extent boundaries */ |
| 659 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) |
| 660 | break; |
| 661 | /* now, is it actually dirty, after all? |
| 662 | * caution, drbd_bm_test_bit is tri-state for some |
| 663 | * obscure reason; ( b == 0 ) would get the out-of-band |
| 664 | * only accidentally right because of the "oddly sized" |
| 665 | * adjustment below */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 666 | if (drbd_bm_test_bit(device, bit+1) != 1) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 667 | break; |
| 668 | bit++; |
| 669 | size += BM_BLOCK_SIZE; |
| 670 | if ((BM_BLOCK_SIZE << align) <= size) |
| 671 | align++; |
| 672 | i++; |
| 673 | } |
| 674 | /* if we merged some, |
| 675 | * reset the offset to start the next drbd_bm_find_next from */ |
| 676 | if (size > BM_BLOCK_SIZE) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 677 | device->bm_resync_fo = bit + 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 678 | #endif |
| 679 | |
| 680 | /* adjust very last sectors, in case we are oddly sized */ |
| 681 | if (sector + (size>>9) > capacity) |
| 682 | size = (capacity-sector)<<9; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 683 | if (first_peer_device(device)->connection->agreed_pro_version >= 89 && |
| 684 | first_peer_device(device)->connection->csums_tfm) { |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 685 | switch (read_for_csum(first_peer_device(device), sector, size)) { |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 686 | case -EIO: /* Disk failure */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 687 | put_ldev(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 688 | return -EIO; |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 689 | case -EAGAIN: /* allocation failed, or ldev busy */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 690 | drbd_rs_complete_io(device, sector); |
| 691 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
Philipp Reisner | d207450 | 2010-07-22 15:27:27 +0200 | [diff] [blame] | 692 | i = rollback_i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 693 | goto requeue; |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 694 | case 0: |
| 695 | /* everything ok */ |
| 696 | break; |
| 697 | default: |
| 698 | BUG(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 699 | } |
| 700 | } else { |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 701 | int err; |
| 702 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 703 | inc_rs_pending(device); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 704 | err = drbd_send_drequest(first_peer_device(device), P_RS_DATA_REQUEST, |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 705 | sector, size, ID_SYNCER); |
| 706 | if (err) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 707 | drbd_err(device, "drbd_send_drequest() failed, aborting...\n"); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 708 | dec_rs_pending(device); |
| 709 | put_ldev(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 710 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 711 | } |
| 712 | } |
| 713 | } |
| 714 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 715 | if (device->bm_resync_fo >= drbd_bm_bits(device)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 716 | /* last syncer _request_ was sent, |
| 717 | * but the P_RS_DATA_REPLY not yet received. sync will end (and |
| 718 | * next sync group will resume), as soon as we receive the last |
| 719 | * resync data block, and the last bit is cleared. |
| 720 | * until then resync "work" is "inactive" ... |
| 721 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 722 | put_ldev(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 723 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 724 | } |
| 725 | |
| 726 | requeue: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 727 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
| 728 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME); |
| 729 | put_ldev(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 730 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 731 | } |
| 732 | |
Andreas Gruenbacher | d448a2e | 2011-08-25 16:59:58 +0200 | [diff] [blame] | 733 | static int make_ov_request(struct drbd_device *device, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 734 | { |
| 735 | int number, i, size; |
| 736 | sector_t sector; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 737 | const sector_t capacity = drbd_get_capacity(device->this_bdev); |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 738 | bool stop_sector_reached = false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 739 | |
| 740 | if (unlikely(cancel)) |
| 741 | return 1; |
| 742 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 743 | number = drbd_rs_number_requests(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 744 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 745 | sector = device->ov_position; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 746 | for (i = 0; i < number; i++) { |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 747 | if (sector >= capacity) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 748 | return 1; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 749 | |
| 750 | /* We check for "finished" only in the reply path: |
| 751 | * w_e_end_ov_reply(). |
| 752 | * We need to send at least one request out. */ |
| 753 | stop_sector_reached = i > 0 |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 754 | && verify_can_do_stop_sector(device) |
| 755 | && sector >= device->ov_stop_sector; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 756 | if (stop_sector_reached) |
| 757 | break; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 758 | |
| 759 | size = BM_BLOCK_SIZE; |
| 760 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 761 | if (drbd_rs_should_slow_down(device, sector) || |
| 762 | drbd_try_rs_begin_io(device, sector)) { |
| 763 | device->ov_position = sector; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 764 | goto requeue; |
| 765 | } |
| 766 | |
| 767 | if (sector + (size>>9) > capacity) |
| 768 | size = (capacity-sector)<<9; |
| 769 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 770 | inc_rs_pending(device); |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 771 | if (drbd_send_ov_request(first_peer_device(device), sector, size)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 772 | dec_rs_pending(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 773 | return 0; |
| 774 | } |
| 775 | sector += BM_SECT_PER_BIT; |
| 776 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 777 | device->ov_position = sector; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 778 | |
| 779 | requeue: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 780 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 781 | if (i == 0 || !stop_sector_reached) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 782 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 783 | return 1; |
| 784 | } |
| 785 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 786 | int w_ov_finished(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 787 | { |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 788 | struct drbd_device_work *dw = |
| 789 | container_of(w, struct drbd_device_work, w); |
| 790 | struct drbd_device *device = dw->device; |
| 791 | kfree(dw); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 792 | ov_out_of_sync_print(device); |
| 793 | drbd_resync_finished(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 794 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 795 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 796 | } |
| 797 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 798 | static int w_resync_finished(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 799 | { |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 800 | struct drbd_device_work *dw = |
| 801 | container_of(w, struct drbd_device_work, w); |
| 802 | struct drbd_device *device = dw->device; |
| 803 | kfree(dw); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 804 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 805 | drbd_resync_finished(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 806 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 807 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 808 | } |
| 809 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 810 | static void ping_peer(struct drbd_device *device) |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 811 | { |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 812 | struct drbd_connection *connection = first_peer_device(device)->connection; |
Philipp Reisner | 2a67d8b | 2011-02-09 14:10:32 +0100 | [diff] [blame] | 813 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 814 | clear_bit(GOT_PING_ACK, &connection->flags); |
| 815 | request_ping(connection); |
| 816 | wait_event(connection->ping_wait, |
| 817 | test_bit(GOT_PING_ACK, &connection->flags) || device->state.conn < C_CONNECTED); |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 818 | } |
| 819 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 820 | int drbd_resync_finished(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 821 | { |
| 822 | unsigned long db, dt, dbdt; |
| 823 | unsigned long n_oos; |
| 824 | union drbd_state os, ns; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 825 | struct drbd_device_work *dw; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 826 | char *khelper_cmd = NULL; |
Lars Ellenberg | 2652561 | 2010-11-05 09:56:33 +0100 | [diff] [blame] | 827 | int verify_done = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 828 | |
| 829 | /* Remove all elements from the resync LRU. Since future actions |
| 830 | * might set bits in the (main) bitmap, then the entries in the |
| 831 | * resync LRU would be wrong. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 832 | if (drbd_rs_del_all(device)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 833 | /* In case this is not possible now, most probably because |
| 834 | * there are P_RS_DATA_REPLY Packets lingering on the worker's |
| 835 | * queue (or even the read operations for those packets |
| 836 | * is not finished by now). Retry in 100ms. */ |
| 837 | |
Philipp Reisner | 20ee639 | 2011-01-18 15:28:59 +0100 | [diff] [blame] | 838 | schedule_timeout_interruptible(HZ / 10); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 839 | dw = kmalloc(sizeof(struct drbd_device_work), GFP_ATOMIC); |
| 840 | if (dw) { |
| 841 | dw->w.cb = w_resync_finished; |
| 842 | dw->device = device; |
| 843 | drbd_queue_work(&first_peer_device(device)->connection->sender_work, |
| 844 | &dw->w); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 845 | return 1; |
| 846 | } |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 847 | drbd_err(device, "Warn failed to drbd_rs_del_all() and to kmalloc(dw).\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 848 | } |
| 849 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 850 | dt = (jiffies - device->rs_start - device->rs_paused) / HZ; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 851 | if (dt <= 0) |
| 852 | dt = 1; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 853 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 854 | db = device->rs_total; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 855 | /* adjust for verify start and stop sectors, respective reached position */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 856 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
| 857 | db -= device->ov_left; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 858 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 859 | dbdt = Bit2KB(db/dt); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 860 | device->rs_paused /= HZ; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 861 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 862 | if (!get_ldev(device)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 863 | goto out; |
| 864 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 865 | ping_peer(device); |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 866 | |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 867 | spin_lock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 868 | os = drbd_read_state(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 869 | |
Lars Ellenberg | 2652561 | 2010-11-05 09:56:33 +0100 | [diff] [blame] | 870 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
| 871 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 872 | /* This protects us against multiple calls (that can happen in the presence |
| 873 | of application IO), and against connectivity loss just before we arrive here. */ |
| 874 | if (os.conn <= C_CONNECTED) |
| 875 | goto out_unlock; |
| 876 | |
| 877 | ns = os; |
| 878 | ns.conn = C_CONNECTED; |
| 879 | |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 880 | drbd_info(device, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 881 | verify_done ? "Online verify" : "Resync", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 882 | dt + device->rs_paused, device->rs_paused, dbdt); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 883 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 884 | n_oos = drbd_bm_total_weight(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 885 | |
| 886 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { |
| 887 | if (n_oos) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 888 | drbd_alert(device, "Online verify found %lu %dk block out of sync!\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 889 | n_oos, Bit2KB(1)); |
| 890 | khelper_cmd = "out-of-sync"; |
| 891 | } |
| 892 | } else { |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 893 | D_ASSERT(device, (n_oos - device->rs_failed) == 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 894 | |
| 895 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) |
| 896 | khelper_cmd = "after-resync-target"; |
| 897 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 898 | if (first_peer_device(device)->connection->csums_tfm && device->rs_total) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 899 | const unsigned long s = device->rs_same_csum; |
| 900 | const unsigned long t = device->rs_total; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 901 | const int ratio = |
| 902 | (t == 0) ? 0 : |
| 903 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 904 | drbd_info(device, "%u %% had equal checksums, eliminated: %luK; " |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 905 | "transferred %luK total %luK\n", |
| 906 | ratio, |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 907 | Bit2KB(device->rs_same_csum), |
| 908 | Bit2KB(device->rs_total - device->rs_same_csum), |
| 909 | Bit2KB(device->rs_total)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 910 | } |
| 911 | } |
| 912 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 913 | if (device->rs_failed) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 914 | drbd_info(device, " %lu failed blocks\n", device->rs_failed); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 915 | |
| 916 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { |
| 917 | ns.disk = D_INCONSISTENT; |
| 918 | ns.pdsk = D_UP_TO_DATE; |
| 919 | } else { |
| 920 | ns.disk = D_UP_TO_DATE; |
| 921 | ns.pdsk = D_INCONSISTENT; |
| 922 | } |
| 923 | } else { |
| 924 | ns.disk = D_UP_TO_DATE; |
| 925 | ns.pdsk = D_UP_TO_DATE; |
| 926 | |
| 927 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 928 | if (device->p_uuid) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 929 | int i; |
| 930 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 931 | _drbd_uuid_set(device, i, device->p_uuid[i]); |
| 932 | drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_CURRENT]); |
| 933 | _drbd_uuid_set(device, UI_CURRENT, device->p_uuid[UI_CURRENT]); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 934 | } else { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 935 | drbd_err(device, "device->p_uuid is NULL! BUG\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 936 | } |
| 937 | } |
| 938 | |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 939 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
| 940 | /* for verify runs, we don't update uuids here, |
| 941 | * so there would be nothing to report. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 942 | drbd_uuid_set_bm(device, 0UL); |
| 943 | drbd_print_uuids(device, "updated UUIDs"); |
| 944 | if (device->p_uuid) { |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 945 | /* Now the two UUID sets are equal, update what we |
| 946 | * know of the peer. */ |
| 947 | int i; |
| 948 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 949 | device->p_uuid[i] = device->ldev->md.uuid[i]; |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 950 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 951 | } |
| 952 | } |
| 953 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 954 | _drbd_set_state(device, ns, CS_VERBOSE, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 955 | out_unlock: |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 956 | spin_unlock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 957 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 958 | out: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 959 | device->rs_total = 0; |
| 960 | device->rs_failed = 0; |
| 961 | device->rs_paused = 0; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 962 | |
| 963 | /* reset start sector, if we reached end of device */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 964 | if (verify_done && device->ov_left == 0) |
| 965 | device->ov_start_sector = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 966 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 967 | drbd_md_sync(device); |
Lars Ellenberg | 13d4268 | 2010-10-13 17:37:54 +0200 | [diff] [blame] | 968 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 969 | if (khelper_cmd) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 970 | drbd_khelper(device, khelper_cmd); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 971 | |
| 972 | return 1; |
| 973 | } |
| 974 | |
| 975 | /* helper */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 976 | static void move_to_net_ee_or_free(struct drbd_device *device, struct drbd_peer_request *peer_req) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 977 | { |
Andreas Gruenbacher | 045417f | 2011-04-07 21:34:24 +0200 | [diff] [blame] | 978 | if (drbd_peer_req_has_active_page(peer_req)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 979 | /* This might happen if sendpage() has not finished */ |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 980 | int i = (peer_req->i.size + PAGE_SIZE -1) >> PAGE_SHIFT; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 981 | atomic_add(i, &device->pp_in_use_by_net); |
| 982 | atomic_sub(i, &device->pp_in_use); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 983 | spin_lock_irq(&device->resource->req_lock); |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 984 | list_add_tail(&peer_req->w.list, &device->net_ee); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 985 | spin_unlock_irq(&device->resource->req_lock); |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 986 | wake_up(&drbd_pp_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 987 | } else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 988 | drbd_free_peer_req(device, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 989 | } |
| 990 | |
| 991 | /** |
| 992 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 993 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 994 | * @w: work object. |
| 995 | * @cancel: The connection will be closed anyways |
| 996 | */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 997 | int w_e_end_data_req(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 998 | { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 999 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1000 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 1001 | struct drbd_device *device = peer_device->device; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1002 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1003 | |
| 1004 | if (unlikely(cancel)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1005 | drbd_free_peer_req(device, peer_req); |
| 1006 | dec_unacked(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1007 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1008 | } |
| 1009 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1010 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1011 | err = drbd_send_block(peer_device, P_DATA_REPLY, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1012 | } else { |
| 1013 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1014 | drbd_err(device, "Sending NegDReply. sector=%llus.\n", |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1015 | (unsigned long long)peer_req->i.sector); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1016 | |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1017 | err = drbd_send_ack(peer_device, P_NEG_DREPLY, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1018 | } |
| 1019 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1020 | dec_unacked(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1021 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1022 | move_to_net_ee_or_free(device, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1023 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1024 | if (unlikely(err)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1025 | drbd_err(device, "drbd_send_block() failed\n"); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1026 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1027 | } |
| 1028 | |
| 1029 | /** |
Andreas Gruenbacher | a209b4a | 2011-08-17 12:43:25 +0200 | [diff] [blame] | 1030 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUEST |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1031 | * @w: work object. |
| 1032 | * @cancel: The connection will be closed anyways |
| 1033 | */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1034 | int w_e_end_rsdata_req(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1035 | { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 1036 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1037 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 1038 | struct drbd_device *device = peer_device->device; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1039 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1040 | |
| 1041 | if (unlikely(cancel)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1042 | drbd_free_peer_req(device, peer_req); |
| 1043 | dec_unacked(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1044 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1045 | } |
| 1046 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1047 | if (get_ldev_if_state(device, D_FAILED)) { |
| 1048 | drbd_rs_complete_io(device, peer_req->i.sector); |
| 1049 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1050 | } |
| 1051 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1052 | if (device->state.conn == C_AHEAD) { |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1053 | err = drbd_send_ack(peer_device, P_RS_CANCEL, peer_req); |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1054 | } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1055 | if (likely(device->state.pdsk >= D_INCONSISTENT)) { |
| 1056 | inc_rs_pending(device); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1057 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1058 | } else { |
| 1059 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1060 | drbd_err(device, "Not sending RSDataReply, " |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1061 | "partner DISKLESS!\n"); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1062 | err = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1063 | } |
| 1064 | } else { |
| 1065 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1066 | drbd_err(device, "Sending NegRSDReply. sector %llus.\n", |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1067 | (unsigned long long)peer_req->i.sector); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1068 | |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1069 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1070 | |
| 1071 | /* update resync data with failure */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1072 | drbd_rs_failed_io(device, peer_req->i.sector, peer_req->i.size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1073 | } |
| 1074 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1075 | dec_unacked(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1076 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1077 | move_to_net_ee_or_free(device, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1078 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1079 | if (unlikely(err)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1080 | drbd_err(device, "drbd_send_block() failed\n"); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1081 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1082 | } |
| 1083 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1084 | int w_e_end_csum_rs_req(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1085 | { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 1086 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1087 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 1088 | struct drbd_device *device = peer_device->device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1089 | struct digest_info *di; |
| 1090 | int digest_size; |
| 1091 | void *digest = NULL; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1092 | int err, eq = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1093 | |
| 1094 | if (unlikely(cancel)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1095 | drbd_free_peer_req(device, peer_req); |
| 1096 | dec_unacked(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1097 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1100 | if (get_ldev(device)) { |
| 1101 | drbd_rs_complete_io(device, peer_req->i.sector); |
| 1102 | put_ldev(device); |
Lars Ellenberg | 1d53f09 | 2010-09-05 01:13:24 +0200 | [diff] [blame] | 1103 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1104 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1105 | di = peer_req->digest; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1106 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1107 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1108 | /* quick hack to try to avoid a race against reconfiguration. |
| 1109 | * a real fix would be much more involved, |
| 1110 | * introducing more locking mechanisms */ |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1111 | if (peer_device->connection->csums_tfm) { |
| 1112 | digest_size = crypto_hash_digestsize(peer_device->connection->csums_tfm); |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1113 | D_ASSERT(device, digest_size == di->digest_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1114 | digest = kmalloc(digest_size, GFP_NOIO); |
| 1115 | } |
| 1116 | if (digest) { |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1117 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1118 | eq = !memcmp(digest, di->digest, digest_size); |
| 1119 | kfree(digest); |
| 1120 | } |
| 1121 | |
| 1122 | if (eq) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1123 | drbd_set_in_sync(device, peer_req->i.sector, peer_req->i.size); |
Lars Ellenberg | 676396d | 2010-03-03 02:08:22 +0100 | [diff] [blame] | 1124 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1125 | device->rs_same_csum += peer_req->i.size >> BM_BLOCK_SHIFT; |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1126 | err = drbd_send_ack(peer_device, P_RS_IS_IN_SYNC, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1127 | } else { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1128 | inc_rs_pending(device); |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1129 | peer_req->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
| 1130 | peer_req->flags &= ~EE_HAS_DIGEST; /* This peer request no longer has a digest pointer */ |
Philipp Reisner | 204bba9 | 2010-08-23 16:17:13 +0200 | [diff] [blame] | 1131 | kfree(di); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1132 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1133 | } |
| 1134 | } else { |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1135 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1136 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1137 | drbd_err(device, "Sending NegDReply. I guess it gets messy.\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1138 | } |
| 1139 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1140 | dec_unacked(device); |
| 1141 | move_to_net_ee_or_free(device, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1142 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1143 | if (unlikely(err)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1144 | drbd_err(device, "drbd_send_block/ack() failed\n"); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1145 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1146 | } |
| 1147 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1148 | int w_e_end_ov_req(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1149 | { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 1150 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1151 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 1152 | struct drbd_device *device = peer_device->device; |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1153 | sector_t sector = peer_req->i.sector; |
| 1154 | unsigned int size = peer_req->i.size; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1155 | int digest_size; |
| 1156 | void *digest; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1157 | int err = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1158 | |
| 1159 | if (unlikely(cancel)) |
| 1160 | goto out; |
| 1161 | |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1162 | digest_size = crypto_hash_digestsize(peer_device->connection->verify_tfm); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1163 | digest = kmalloc(digest_size, GFP_NOIO); |
Philipp Reisner | 8f21420 | 2011-03-01 15:52:35 +0100 | [diff] [blame] | 1164 | if (!digest) { |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1165 | err = 1; /* terminate the connection in case the allocation failed */ |
Philipp Reisner | 8f21420 | 2011-03-01 15:52:35 +0100 | [diff] [blame] | 1166 | goto out; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1167 | } |
| 1168 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1169 | if (likely(!(peer_req->flags & EE_WAS_ERROR))) |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1170 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest); |
Philipp Reisner | 8f21420 | 2011-03-01 15:52:35 +0100 | [diff] [blame] | 1171 | else |
| 1172 | memset(digest, 0, digest_size); |
| 1173 | |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 1174 | /* Free e and pages before send. |
| 1175 | * In case we block on congestion, we could otherwise run into |
| 1176 | * some distributed deadlock, if the other side blocks on |
| 1177 | * congestion as well, because our receiver blocks in |
Andreas Gruenbacher | c37c8ec | 2011-04-07 21:02:09 +0200 | [diff] [blame] | 1178 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1179 | drbd_free_peer_req(device, peer_req); |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1180 | peer_req = NULL; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1181 | inc_rs_pending(device); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1182 | err = drbd_send_drequest_csum(peer_device, sector, size, digest, digest_size, P_OV_REPLY); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1183 | if (err) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1184 | dec_rs_pending(device); |
Philipp Reisner | 8f21420 | 2011-03-01 15:52:35 +0100 | [diff] [blame] | 1185 | kfree(digest); |
| 1186 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1187 | out: |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1188 | if (peer_req) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1189 | drbd_free_peer_req(device, peer_req); |
| 1190 | dec_unacked(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1191 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1192 | } |
| 1193 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1194 | void drbd_ov_out_of_sync_found(struct drbd_device *device, sector_t sector, int size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1195 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1196 | if (device->ov_last_oos_start + device->ov_last_oos_size == sector) { |
| 1197 | device->ov_last_oos_size += size>>9; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1198 | } else { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1199 | device->ov_last_oos_start = sector; |
| 1200 | device->ov_last_oos_size = size>>9; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1201 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1202 | drbd_set_out_of_sync(device, sector, size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1203 | } |
| 1204 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1205 | int w_e_end_ov_reply(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1206 | { |
Andreas Gruenbacher | a8cd15b | 2011-08-25 15:49:40 +0200 | [diff] [blame] | 1207 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1208 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
| 1209 | struct drbd_device *device = peer_device->device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1210 | struct digest_info *di; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1211 | void *digest; |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1212 | sector_t sector = peer_req->i.sector; |
| 1213 | unsigned int size = peer_req->i.size; |
Lars Ellenberg | 53ea433 | 2011-03-08 17:11:40 +0100 | [diff] [blame] | 1214 | int digest_size; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1215 | int err, eq = 0; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 1216 | bool stop_sector_reached = false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1217 | |
| 1218 | if (unlikely(cancel)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1219 | drbd_free_peer_req(device, peer_req); |
| 1220 | dec_unacked(device); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1221 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1222 | } |
| 1223 | |
| 1224 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all |
| 1225 | * the resync lru has been cleaned up already */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1226 | if (get_ldev(device)) { |
| 1227 | drbd_rs_complete_io(device, peer_req->i.sector); |
| 1228 | put_ldev(device); |
Lars Ellenberg | 1d53f09 | 2010-09-05 01:13:24 +0200 | [diff] [blame] | 1229 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1230 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1231 | di = peer_req->digest; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1232 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1233 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1234 | digest_size = crypto_hash_digestsize(peer_device->connection->verify_tfm); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1235 | digest = kmalloc(digest_size, GFP_NOIO); |
| 1236 | if (digest) { |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1237 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1238 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1239 | D_ASSERT(device, digest_size == di->digest_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1240 | eq = !memcmp(digest, di->digest, digest_size); |
| 1241 | kfree(digest); |
| 1242 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1243 | } |
| 1244 | |
Lars Ellenberg | 9676c76 | 2011-02-22 14:02:31 +0100 | [diff] [blame] | 1245 | /* Free peer_req and pages before send. |
| 1246 | * In case we block on congestion, we could otherwise run into |
| 1247 | * some distributed deadlock, if the other side blocks on |
| 1248 | * congestion as well, because our receiver blocks in |
Andreas Gruenbacher | c37c8ec | 2011-04-07 21:02:09 +0200 | [diff] [blame] | 1249 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1250 | drbd_free_peer_req(device, peer_req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1251 | if (!eq) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1252 | drbd_ov_out_of_sync_found(device, sector, size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1253 | else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1254 | ov_out_of_sync_print(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1255 | |
Andreas Gruenbacher | 6780139 | 2011-09-13 10:39:41 +0200 | [diff] [blame] | 1256 | err = drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, |
Andreas Gruenbacher | fa79abd | 2011-03-16 01:31:39 +0100 | [diff] [blame] | 1257 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1258 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1259 | dec_unacked(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1260 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1261 | --device->ov_left; |
Lars Ellenberg | ea5442a | 2010-11-05 09:48:01 +0100 | [diff] [blame] | 1262 | |
| 1263 | /* let's advance progress step marks only for every other megabyte */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1264 | if ((device->ov_left & 0x200) == 0x200) |
| 1265 | drbd_advance_rs_marks(device, device->ov_left); |
Lars Ellenberg | ea5442a | 2010-11-05 09:48:01 +0100 | [diff] [blame] | 1266 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1267 | stop_sector_reached = verify_can_do_stop_sector(device) && |
| 1268 | (sector + (size>>9)) >= device->ov_stop_sector; |
Lars Ellenberg | 58ffa58 | 2012-07-26 14:09:49 +0200 | [diff] [blame] | 1269 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1270 | if (device->ov_left == 0 || stop_sector_reached) { |
| 1271 | ov_out_of_sync_print(device); |
| 1272 | drbd_resync_finished(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1273 | } |
| 1274 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1275 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1276 | } |
| 1277 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1278 | /* FIXME |
| 1279 | * We need to track the number of pending barrier acks, |
| 1280 | * and to be able to wait for them. |
| 1281 | * See also comment in drbd_adm_attach before drbd_suspend_io. |
| 1282 | */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1283 | static int drbd_send_barrier(struct drbd_connection *connection) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1284 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1285 | struct p_barrier *p; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1286 | struct drbd_socket *sock; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1287 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1288 | sock = &connection->data; |
| 1289 | p = conn_prepare_command(connection, sock); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1290 | if (!p) |
| 1291 | return -EIO; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1292 | p->barrier = connection->send.current_epoch_nr; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1293 | p->pad = 0; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1294 | connection->send.current_epoch_writes = 0; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1295 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1296 | return conn_send_command(connection, sock, P_BARRIER, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1297 | } |
| 1298 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1299 | int w_send_write_hint(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1300 | { |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1301 | struct drbd_device *device = |
| 1302 | container_of(w, struct drbd_device, unplug_work); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1303 | struct drbd_socket *sock; |
| 1304 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1305 | if (cancel) |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1306 | return 0; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1307 | sock = &first_peer_device(device)->connection->data; |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1308 | if (!drbd_prepare_command(first_peer_device(device), sock)) |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1309 | return -EIO; |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1310 | return drbd_send_command(first_peer_device(device), sock, P_UNPLUG_REMOTE, 0, NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1311 | } |
| 1312 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1313 | static void re_init_if_first_write(struct drbd_connection *connection, unsigned int epoch) |
Lars Ellenberg | 4eb9b3c | 2012-08-20 11:05:23 +0200 | [diff] [blame] | 1314 | { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1315 | if (!connection->send.seen_any_write_yet) { |
| 1316 | connection->send.seen_any_write_yet = true; |
| 1317 | connection->send.current_epoch_nr = epoch; |
| 1318 | connection->send.current_epoch_writes = 0; |
Lars Ellenberg | 4eb9b3c | 2012-08-20 11:05:23 +0200 | [diff] [blame] | 1319 | } |
| 1320 | } |
| 1321 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1322 | static void maybe_send_barrier(struct drbd_connection *connection, unsigned int epoch) |
Lars Ellenberg | 4eb9b3c | 2012-08-20 11:05:23 +0200 | [diff] [blame] | 1323 | { |
| 1324 | /* re-init if first write on this connection */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1325 | if (!connection->send.seen_any_write_yet) |
Lars Ellenberg | 4eb9b3c | 2012-08-20 11:05:23 +0200 | [diff] [blame] | 1326 | return; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1327 | if (connection->send.current_epoch_nr != epoch) { |
| 1328 | if (connection->send.current_epoch_writes) |
| 1329 | drbd_send_barrier(connection); |
| 1330 | connection->send.current_epoch_nr = epoch; |
Lars Ellenberg | 4eb9b3c | 2012-08-20 11:05:23 +0200 | [diff] [blame] | 1331 | } |
| 1332 | } |
| 1333 | |
Andreas Gruenbacher | 8f7bed7 | 2010-12-19 23:53:14 +0100 | [diff] [blame] | 1334 | int w_send_out_of_sync(struct drbd_work *w, int cancel) |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1335 | { |
| 1336 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1337 | struct drbd_device *device = req->device; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1338 | struct drbd_connection *connection = first_peer_device(device)->connection; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1339 | int err; |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1340 | |
| 1341 | if (unlikely(cancel)) { |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1342 | req_mod(req, SEND_CANCELED); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1343 | return 0; |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1344 | } |
| 1345 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1346 | /* this time, no connection->send.current_epoch_writes++; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1347 | * If it was sent, it was the closing barrier for the last |
| 1348 | * replicated epoch, before we went into AHEAD mode. |
| 1349 | * No more barriers will be sent, until we leave AHEAD mode again. */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1350 | maybe_send_barrier(connection, req->epoch); |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1351 | |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1352 | err = drbd_send_out_of_sync(first_peer_device(device), req); |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1353 | req_mod(req, OOS_HANDED_TO_NETWORK); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1354 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1355 | return err; |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1356 | } |
| 1357 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1358 | /** |
| 1359 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1360 | * @w: work object. |
| 1361 | * @cancel: The connection will be closed anyways |
| 1362 | */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1363 | int w_send_dblock(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1364 | { |
| 1365 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1366 | struct drbd_device *device = req->device; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1367 | struct drbd_connection *connection = first_peer_device(device)->connection; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1368 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1369 | |
| 1370 | if (unlikely(cancel)) { |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1371 | req_mod(req, SEND_CANCELED); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1372 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1373 | } |
| 1374 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1375 | re_init_if_first_write(connection, req->epoch); |
| 1376 | maybe_send_barrier(connection, req->epoch); |
| 1377 | connection->send.current_epoch_writes++; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1378 | |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1379 | err = drbd_send_dblock(first_peer_device(device), req); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1380 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1381 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1382 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1383 | } |
| 1384 | |
| 1385 | /** |
| 1386 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1387 | * @w: work object. |
| 1388 | * @cancel: The connection will be closed anyways |
| 1389 | */ |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1390 | int w_send_read_req(struct drbd_work *w, int cancel) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1391 | { |
| 1392 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1393 | struct drbd_device *device = req->device; |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1394 | struct drbd_connection *connection = first_peer_device(device)->connection; |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1395 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1396 | |
| 1397 | if (unlikely(cancel)) { |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 1398 | req_mod(req, SEND_CANCELED); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1399 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1400 | } |
| 1401 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1402 | /* Even read requests may close a write epoch, |
| 1403 | * if there was any yet. */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1404 | maybe_send_barrier(connection, req->epoch); |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1405 | |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1406 | err = drbd_send_drequest(first_peer_device(device), P_DATA_REQUEST, req->i.sector, req->i.size, |
Andreas Gruenbacher | 6c1005e | 2011-03-16 01:34:24 +0100 | [diff] [blame] | 1407 | (unsigned long)req); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1408 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1409 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1410 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1411 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1412 | } |
| 1413 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1414 | int w_restart_disk_io(struct drbd_work *w, int cancel) |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1415 | { |
| 1416 | struct drbd_request *req = container_of(w, struct drbd_request, w); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1417 | struct drbd_device *device = req->device; |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1418 | |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 1419 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1420 | drbd_al_begin_io(device, &req->i, false); |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1421 | |
| 1422 | drbd_req_make_private_bio(req, req->master_bio); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1423 | req->private_bio->bi_bdev = device->ldev->backing_bdev; |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1424 | generic_make_request(req->private_bio); |
| 1425 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1426 | return 0; |
Philipp Reisner | 265be2d | 2010-05-31 10:14:17 +0200 | [diff] [blame] | 1427 | } |
| 1428 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1429 | static int _drbd_may_sync_now(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1430 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1431 | struct drbd_device *odev = device; |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1432 | int resync_after; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1433 | |
| 1434 | while (1) { |
Lars Ellenberg | a3f8f7d | 2013-03-27 14:08:43 +0100 | [diff] [blame] | 1435 | if (!odev->ldev || odev->state.disk == D_DISKLESS) |
Philipp Reisner | 438c837 | 2011-03-28 14:48:01 +0200 | [diff] [blame] | 1436 | return 1; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1437 | rcu_read_lock(); |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1438 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1439 | rcu_read_unlock(); |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1440 | if (resync_after == -1) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1441 | return 1; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1442 | odev = minor_to_device(resync_after); |
Lars Ellenberg | a3f8f7d | 2013-03-27 14:08:43 +0100 | [diff] [blame] | 1443 | if (!odev) |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1444 | return 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1445 | if ((odev->state.conn >= C_SYNC_SOURCE && |
| 1446 | odev->state.conn <= C_PAUSED_SYNC_T) || |
| 1447 | odev->state.aftr_isp || odev->state.peer_isp || |
| 1448 | odev->state.user_isp) |
| 1449 | return 0; |
| 1450 | } |
| 1451 | } |
| 1452 | |
| 1453 | /** |
| 1454 | * _drbd_pause_after() - Pause resync on all devices that may not resync now |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1455 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1456 | * |
| 1457 | * Called from process context only (admin command and after_state_ch). |
| 1458 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1459 | static int _drbd_pause_after(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1460 | { |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1461 | struct drbd_device *odev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1462 | int i, rv = 0; |
| 1463 | |
Philipp Reisner | 695d08f | 2011-04-11 22:53:32 -0700 | [diff] [blame] | 1464 | rcu_read_lock(); |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 1465 | idr_for_each_entry(&drbd_devices, odev, i) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1466 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
| 1467 | continue; |
| 1468 | if (!_drbd_may_sync_now(odev)) |
| 1469 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) |
| 1470 | != SS_NOTHING_TO_DO); |
| 1471 | } |
Philipp Reisner | 695d08f | 2011-04-11 22:53:32 -0700 | [diff] [blame] | 1472 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1473 | |
| 1474 | return rv; |
| 1475 | } |
| 1476 | |
| 1477 | /** |
| 1478 | * _drbd_resume_next() - Resume resync on all devices that may resync now |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1479 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1480 | * |
| 1481 | * Called from process context only (admin command and worker). |
| 1482 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1483 | static int _drbd_resume_next(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1484 | { |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1485 | struct drbd_device *odev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1486 | int i, rv = 0; |
| 1487 | |
Philipp Reisner | 695d08f | 2011-04-11 22:53:32 -0700 | [diff] [blame] | 1488 | rcu_read_lock(); |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 1489 | idr_for_each_entry(&drbd_devices, odev, i) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1490 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
| 1491 | continue; |
| 1492 | if (odev->state.aftr_isp) { |
| 1493 | if (_drbd_may_sync_now(odev)) |
| 1494 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), |
| 1495 | CS_HARD, NULL) |
| 1496 | != SS_NOTHING_TO_DO) ; |
| 1497 | } |
| 1498 | } |
Philipp Reisner | 695d08f | 2011-04-11 22:53:32 -0700 | [diff] [blame] | 1499 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1500 | return rv; |
| 1501 | } |
| 1502 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1503 | void resume_next_sg(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1504 | { |
| 1505 | write_lock_irq(&global_state_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1506 | _drbd_resume_next(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1507 | write_unlock_irq(&global_state_lock); |
| 1508 | } |
| 1509 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1510 | void suspend_other_sg(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1511 | { |
| 1512 | write_lock_irq(&global_state_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1513 | _drbd_pause_after(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1514 | write_unlock_irq(&global_state_lock); |
| 1515 | } |
| 1516 | |
Philipp Reisner | dc97b70 | 2011-05-03 14:27:15 +0200 | [diff] [blame] | 1517 | /* caller must hold global_state_lock */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1518 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1519 | { |
Andreas Gruenbacher | 5476169 | 2011-05-30 16:15:21 +0200 | [diff] [blame] | 1520 | struct drbd_device *odev; |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1521 | int resync_after; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1522 | |
| 1523 | if (o_minor == -1) |
| 1524 | return NO_ERROR; |
Lars Ellenberg | a3f8f7d | 2013-03-27 14:08:43 +0100 | [diff] [blame] | 1525 | if (o_minor < -1 || o_minor > MINORMASK) |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1526 | return ERR_RESYNC_AFTER; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1527 | |
| 1528 | /* check for loops */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1529 | odev = minor_to_device(o_minor); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1530 | while (1) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1531 | if (odev == device) |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1532 | return ERR_RESYNC_AFTER_CYCLE; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1533 | |
Lars Ellenberg | a3f8f7d | 2013-03-27 14:08:43 +0100 | [diff] [blame] | 1534 | /* You are free to depend on diskless, non-existing, |
| 1535 | * or not yet/no longer existing minors. |
| 1536 | * We only reject dependency loops. |
| 1537 | * We cannot follow the dependency chain beyond a detached or |
| 1538 | * missing minor. |
| 1539 | */ |
| 1540 | if (!odev || !odev->ldev || odev->state.disk == D_DISKLESS) |
| 1541 | return NO_ERROR; |
| 1542 | |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1543 | rcu_read_lock(); |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1544 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 1545 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1546 | /* dependency chain ends here, no cycles. */ |
Andreas Gruenbacher | 95f8efd | 2011-05-12 11:15:34 +0200 | [diff] [blame] | 1547 | if (resync_after == -1) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1548 | return NO_ERROR; |
| 1549 | |
| 1550 | /* follow the dependency chain */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1551 | odev = minor_to_device(resync_after); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1552 | } |
| 1553 | } |
| 1554 | |
Philipp Reisner | dc97b70 | 2011-05-03 14:27:15 +0200 | [diff] [blame] | 1555 | /* caller must hold global_state_lock */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1556 | void drbd_resync_after_changed(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1557 | { |
| 1558 | int changes; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1559 | |
Philipp Reisner | dc97b70 | 2011-05-03 14:27:15 +0200 | [diff] [blame] | 1560 | do { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1561 | changes = _drbd_pause_after(device); |
| 1562 | changes |= _drbd_resume_next(device); |
Philipp Reisner | dc97b70 | 2011-05-03 14:27:15 +0200 | [diff] [blame] | 1563 | } while (changes); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1564 | } |
| 1565 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1566 | void drbd_rs_controller_reset(struct drbd_device *device) |
Lars Ellenberg | 9bd28d3 | 2010-11-05 09:55:18 +0100 | [diff] [blame] | 1567 | { |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 1568 | struct fifo_buffer *plan; |
| 1569 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1570 | atomic_set(&device->rs_sect_in, 0); |
| 1571 | atomic_set(&device->rs_sect_ev, 0); |
| 1572 | device->rs_in_flight = 0; |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 1573 | |
| 1574 | /* Updating the RCU protected object in place is necessary since |
| 1575 | this function gets called from atomic context. |
| 1576 | It is valid since all other updates also lead to an completely |
| 1577 | empty fifo */ |
| 1578 | rcu_read_lock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1579 | plan = rcu_dereference(device->rs_plan_s); |
Philipp Reisner | 813472c | 2011-05-03 16:47:02 +0200 | [diff] [blame] | 1580 | plan->total = 0; |
| 1581 | fifo_set(plan, 0); |
| 1582 | rcu_read_unlock(); |
Lars Ellenberg | 9bd28d3 | 2010-11-05 09:55:18 +0100 | [diff] [blame] | 1583 | } |
| 1584 | |
Philipp Reisner | 1f04af3 | 2011-02-07 11:33:59 +0100 | [diff] [blame] | 1585 | void start_resync_timer_fn(unsigned long data) |
| 1586 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1587 | struct drbd_device *device = (struct drbd_device *) data; |
Philipp Reisner | 1f04af3 | 2011-02-07 11:33:59 +0100 | [diff] [blame] | 1588 | |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1589 | drbd_queue_work(&first_peer_device(device)->connection->sender_work, |
| 1590 | &device->start_resync_work); |
Philipp Reisner | 1f04af3 | 2011-02-07 11:33:59 +0100 | [diff] [blame] | 1591 | } |
| 1592 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1593 | int w_start_resync(struct drbd_work *w, int cancel) |
Philipp Reisner | 1f04af3 | 2011-02-07 11:33:59 +0100 | [diff] [blame] | 1594 | { |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 1595 | struct drbd_device *device = |
| 1596 | container_of(w, struct drbd_device, start_resync_work); |
Philipp Reisner | 00d5694 | 2011-02-09 18:09:48 +0100 | [diff] [blame] | 1597 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1598 | if (atomic_read(&device->unacked_cnt) || atomic_read(&device->rs_pending_cnt)) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1599 | drbd_warn(device, "w_start_resync later...\n"); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1600 | device->start_resync_timer.expires = jiffies + HZ/10; |
| 1601 | add_timer(&device->start_resync_timer); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1602 | return 0; |
Philipp Reisner | 1f04af3 | 2011-02-07 11:33:59 +0100 | [diff] [blame] | 1603 | } |
| 1604 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1605 | drbd_start_resync(device, C_SYNC_SOURCE); |
| 1606 | clear_bit(AHEAD_TO_SYNC_SOURCE, &device->flags); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 1607 | return 0; |
Philipp Reisner | 1f04af3 | 2011-02-07 11:33:59 +0100 | [diff] [blame] | 1608 | } |
| 1609 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1610 | /** |
| 1611 | * drbd_start_resync() - Start the resync process |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1612 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1613 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET |
| 1614 | * |
| 1615 | * This function might bring you directly into one of the |
| 1616 | * C_PAUSED_SYNC_* states. |
| 1617 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1618 | void drbd_start_resync(struct drbd_device *device, enum drbd_conns side) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1619 | { |
| 1620 | union drbd_state ns; |
| 1621 | int r; |
| 1622 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1623 | if (device->state.conn >= C_SYNC_SOURCE && device->state.conn < C_AHEAD) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1624 | drbd_err(device, "Resync already running!\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1625 | return; |
| 1626 | } |
| 1627 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1628 | if (!test_bit(B_RS_H_DONE, &device->flags)) { |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1629 | if (side == C_SYNC_TARGET) { |
| 1630 | /* Since application IO was locked out during C_WF_BITMAP_T and |
| 1631 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET |
| 1632 | we check that we might make the data inconsistent. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1633 | r = drbd_khelper(device, "before-resync-target"); |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1634 | r = (r >> 8) & 0xff; |
| 1635 | if (r > 0) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1636 | drbd_info(device, "before-resync-target handler returned %d, " |
Philipp Reisner | 09b9e79 | 2010-12-03 16:04:24 +0100 | [diff] [blame] | 1637 | "dropping connection.\n", r); |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1638 | conn_request_state(first_peer_device(device)->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
Philipp Reisner | 09b9e79 | 2010-12-03 16:04:24 +0100 | [diff] [blame] | 1639 | return; |
| 1640 | } |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1641 | } else /* C_SYNC_SOURCE */ { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1642 | r = drbd_khelper(device, "before-resync-source"); |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1643 | r = (r >> 8) & 0xff; |
| 1644 | if (r > 0) { |
| 1645 | if (r == 3) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1646 | drbd_info(device, "before-resync-source handler returned %d, " |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1647 | "ignoring. Old userland tools?", r); |
| 1648 | } else { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1649 | drbd_info(device, "before-resync-source handler returned %d, " |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1650 | "dropping connection.\n", r); |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1651 | conn_request_state(first_peer_device(device)->connection, |
| 1652 | NS(conn, C_DISCONNECTING), CS_HARD); |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1653 | return; |
| 1654 | } |
| 1655 | } |
Philipp Reisner | 09b9e79 | 2010-12-03 16:04:24 +0100 | [diff] [blame] | 1656 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1657 | } |
| 1658 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1659 | if (current == first_peer_device(device)->connection->worker.task) { |
Philipp Reisner | dad2055 | 2011-02-11 19:43:55 +0100 | [diff] [blame] | 1660 | /* The worker should not sleep waiting for state_mutex, |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1661 | that can take long */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1662 | if (!mutex_trylock(device->state_mutex)) { |
| 1663 | set_bit(B_RS_H_DONE, &device->flags); |
| 1664 | device->start_resync_timer.expires = jiffies + HZ/5; |
| 1665 | add_timer(&device->start_resync_timer); |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1666 | return; |
| 1667 | } |
| 1668 | } else { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1669 | mutex_lock(device->state_mutex); |
Philipp Reisner | e64a329 | 2011-02-05 17:34:11 +0100 | [diff] [blame] | 1670 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1671 | clear_bit(B_RS_H_DONE, &device->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1672 | |
Philipp Reisner | 0cfac5d | 2011-11-10 12:12:52 +0100 | [diff] [blame] | 1673 | write_lock_irq(&global_state_lock); |
Philipp Reisner | a700471 | 2013-03-27 14:08:35 +0100 | [diff] [blame] | 1674 | /* Did some connection breakage or IO error race with us? */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1675 | if (device->state.conn < C_CONNECTED |
| 1676 | || !get_ldev_if_state(device, D_NEGOTIATING)) { |
Philipp Reisner | 0cfac5d | 2011-11-10 12:12:52 +0100 | [diff] [blame] | 1677 | write_unlock_irq(&global_state_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1678 | mutex_unlock(device->state_mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1679 | return; |
| 1680 | } |
| 1681 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1682 | ns = drbd_read_state(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1683 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1684 | ns.aftr_isp = !_drbd_may_sync_now(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1685 | |
| 1686 | ns.conn = side; |
| 1687 | |
| 1688 | if (side == C_SYNC_TARGET) |
| 1689 | ns.disk = D_INCONSISTENT; |
| 1690 | else /* side == C_SYNC_SOURCE */ |
| 1691 | ns.pdsk = D_INCONSISTENT; |
| 1692 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1693 | r = __drbd_set_state(device, ns, CS_VERBOSE, NULL); |
| 1694 | ns = drbd_read_state(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1695 | |
| 1696 | if (ns.conn < C_CONNECTED) |
| 1697 | r = SS_UNKNOWN_ERROR; |
| 1698 | |
| 1699 | if (r == SS_SUCCESS) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1700 | unsigned long tw = drbd_bm_total_weight(device); |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1701 | unsigned long now = jiffies; |
| 1702 | int i; |
| 1703 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1704 | device->rs_failed = 0; |
| 1705 | device->rs_paused = 0; |
| 1706 | device->rs_same_csum = 0; |
| 1707 | device->rs_last_events = 0; |
| 1708 | device->rs_last_sect_ev = 0; |
| 1709 | device->rs_total = tw; |
| 1710 | device->rs_start = now; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1711 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1712 | device->rs_mark_left[i] = tw; |
| 1713 | device->rs_mark_time[i] = now; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1714 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1715 | _drbd_pause_after(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1716 | } |
| 1717 | write_unlock_irq(&global_state_lock); |
Lars Ellenberg | 5a22db8 | 2010-12-17 21:14:23 +0100 | [diff] [blame] | 1718 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1719 | if (r == SS_SUCCESS) { |
Philipp Reisner | 328e0f12 | 2012-10-19 14:37:47 +0200 | [diff] [blame] | 1720 | /* reset rs_last_bcast when a resync or verify is started, |
| 1721 | * to deal with potential jiffies wrap. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1722 | device->rs_last_bcast = jiffies - HZ; |
Philipp Reisner | 328e0f12 | 2012-10-19 14:37:47 +0200 | [diff] [blame] | 1723 | |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1724 | drbd_info(device, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1725 | drbd_conn_str(ns.conn), |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1726 | (unsigned long) device->rs_total << (BM_BLOCK_SHIFT-10), |
| 1727 | (unsigned long) device->rs_total); |
Lars Ellenberg | 6c922ed | 2011-01-12 11:51:13 +0100 | [diff] [blame] | 1728 | if (side == C_SYNC_TARGET) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1729 | device->bm_resync_fo = 0; |
Lars Ellenberg | 6c922ed | 2011-01-12 11:51:13 +0100 | [diff] [blame] | 1730 | |
| 1731 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid |
| 1732 | * with w_send_oos, or the sync target will get confused as to |
| 1733 | * how much bits to resync. We cannot do that always, because for an |
| 1734 | * empty resync and protocol < 95, we need to do it here, as we call |
| 1735 | * drbd_resync_finished from here in that case. |
| 1736 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, |
| 1737 | * and from after_state_ch otherwise. */ |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1738 | if (side == C_SYNC_SOURCE && |
| 1739 | first_peer_device(device)->connection->agreed_pro_version < 96) |
Andreas Gruenbacher | 69a2277 | 2011-08-09 00:47:13 +0200 | [diff] [blame] | 1740 | drbd_gen_and_send_sync_uuid(first_peer_device(device)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1741 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1742 | if (first_peer_device(device)->connection->agreed_pro_version < 95 && |
| 1743 | device->rs_total == 0) { |
Lars Ellenberg | af85e8e | 2010-10-07 16:07:55 +0200 | [diff] [blame] | 1744 | /* This still has a race (about when exactly the peers |
| 1745 | * detect connection loss) that can lead to a full sync |
| 1746 | * on next handshake. In 8.3.9 we fixed this with explicit |
| 1747 | * resync-finished notifications, but the fix |
| 1748 | * introduces a protocol change. Sleeping for some |
| 1749 | * time longer than the ping interval + timeout on the |
| 1750 | * SyncSource, to give the SyncTarget the chance to |
| 1751 | * detect connection loss, then waiting for a ping |
| 1752 | * response (implicit in drbd_resync_finished) reduces |
| 1753 | * the race considerably, but does not solve it. */ |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 1754 | if (side == C_SYNC_SOURCE) { |
| 1755 | struct net_conf *nc; |
| 1756 | int timeo; |
| 1757 | |
| 1758 | rcu_read_lock(); |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 1759 | nc = rcu_dereference(first_peer_device(device)->connection->net_conf); |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 1760 | timeo = nc->ping_int * HZ + nc->ping_timeo * HZ / 9; |
| 1761 | rcu_read_unlock(); |
| 1762 | schedule_timeout_interruptible(timeo); |
| 1763 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1764 | drbd_resync_finished(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1765 | } |
| 1766 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1767 | drbd_rs_controller_reset(device); |
| 1768 | /* ns.conn may already be != device->state.conn, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1769 | * we may have been paused in between, or become paused until |
| 1770 | * the timer triggers. |
| 1771 | * No matter, that is handled in resync_timer_fn() */ |
| 1772 | if (ns.conn == C_SYNC_TARGET) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1773 | mod_timer(&device->resync_timer, jiffies); |
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 | drbd_md_sync(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1776 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1777 | put_ldev(device); |
| 1778 | mutex_unlock(device->state_mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1779 | } |
| 1780 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1781 | /* If the resource already closed the current epoch, but we did not |
| 1782 | * (because we have not yet seen new requests), we should send the |
| 1783 | * corresponding barrier now. Must be checked within the same spinlock |
| 1784 | * that is used to check for new requests. */ |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1785 | static bool need_to_send_barrier(struct drbd_connection *connection) |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1786 | { |
| 1787 | if (!connection->send.seen_any_write_yet) |
| 1788 | return false; |
| 1789 | |
| 1790 | /* Skip barriers that do not contain any writes. |
| 1791 | * This may happen during AHEAD mode. */ |
| 1792 | if (!connection->send.current_epoch_writes) |
| 1793 | return false; |
| 1794 | |
| 1795 | /* ->req_lock is held when requests are queued on |
| 1796 | * connection->sender_work, and put into ->transfer_log. |
| 1797 | * It is also held when ->current_tle_nr is increased. |
| 1798 | * So either there are already new requests queued, |
| 1799 | * and corresponding barriers will be send there. |
| 1800 | * Or nothing new is queued yet, so the difference will be 1. |
| 1801 | */ |
| 1802 | if (atomic_read(&connection->current_tle_nr) != |
| 1803 | connection->send.current_epoch_nr + 1) |
| 1804 | return false; |
| 1805 | |
| 1806 | return true; |
| 1807 | } |
| 1808 | |
Rashika Kheria | a186e47 | 2013-12-19 15:06:10 +0530 | [diff] [blame] | 1809 | static bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *work_list) |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1810 | { |
| 1811 | spin_lock_irq(&queue->q_lock); |
| 1812 | list_splice_init(&queue->q, work_list); |
| 1813 | spin_unlock_irq(&queue->q_lock); |
| 1814 | return !list_empty(work_list); |
| 1815 | } |
| 1816 | |
Rashika Kheria | a186e47 | 2013-12-19 15:06:10 +0530 | [diff] [blame] | 1817 | static bool dequeue_work_item(struct drbd_work_queue *queue, struct list_head *work_list) |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1818 | { |
| 1819 | spin_lock_irq(&queue->q_lock); |
| 1820 | if (!list_empty(&queue->q)) |
| 1821 | list_move(queue->q.next, work_list); |
| 1822 | spin_unlock_irq(&queue->q_lock); |
| 1823 | return !list_empty(work_list); |
| 1824 | } |
| 1825 | |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1826 | static void wait_for_work(struct drbd_connection *connection, struct list_head *work_list) |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1827 | { |
| 1828 | DEFINE_WAIT(wait); |
| 1829 | struct net_conf *nc; |
| 1830 | int uncork, cork; |
| 1831 | |
| 1832 | dequeue_work_item(&connection->sender_work, work_list); |
| 1833 | if (!list_empty(work_list)) |
| 1834 | return; |
| 1835 | |
| 1836 | /* Still nothing to do? |
| 1837 | * Maybe we still need to close the current epoch, |
| 1838 | * even if no new requests are queued yet. |
| 1839 | * |
| 1840 | * Also, poke TCP, just in case. |
| 1841 | * Then wait for new work (or signal). */ |
| 1842 | rcu_read_lock(); |
| 1843 | nc = rcu_dereference(connection->net_conf); |
| 1844 | uncork = nc ? nc->tcp_cork : 0; |
| 1845 | rcu_read_unlock(); |
| 1846 | if (uncork) { |
| 1847 | mutex_lock(&connection->data.mutex); |
| 1848 | if (connection->data.socket) |
| 1849 | drbd_tcp_uncork(connection->data.socket); |
| 1850 | mutex_unlock(&connection->data.mutex); |
| 1851 | } |
| 1852 | |
| 1853 | for (;;) { |
| 1854 | int send_barrier; |
| 1855 | prepare_to_wait(&connection->sender_work.q_wait, &wait, TASK_INTERRUPTIBLE); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1856 | spin_lock_irq(&connection->resource->req_lock); |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1857 | spin_lock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ |
Lars Ellenberg | bc317a9 | 2012-08-22 11:47:14 +0200 | [diff] [blame] | 1858 | /* dequeue single item only, |
| 1859 | * we still use drbd_queue_work_front() in some places */ |
| 1860 | if (!list_empty(&connection->sender_work.q)) |
| 1861 | list_move(connection->sender_work.q.next, work_list); |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1862 | spin_unlock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ |
| 1863 | if (!list_empty(work_list) || signal_pending(current)) { |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1864 | spin_unlock_irq(&connection->resource->req_lock); |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1865 | break; |
| 1866 | } |
| 1867 | send_barrier = need_to_send_barrier(connection); |
Andreas Gruenbacher | 0500813 | 2011-07-07 14:19:42 +0200 | [diff] [blame] | 1868 | spin_unlock_irq(&connection->resource->req_lock); |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 1869 | if (send_barrier) { |
| 1870 | drbd_send_barrier(connection); |
| 1871 | connection->send.current_epoch_nr++; |
| 1872 | } |
| 1873 | schedule(); |
| 1874 | /* may be woken up for other things but new work, too, |
| 1875 | * e.g. if the current epoch got closed. |
| 1876 | * In which case we send the barrier above. */ |
| 1877 | } |
| 1878 | finish_wait(&connection->sender_work.q_wait, &wait); |
| 1879 | |
| 1880 | /* someone may have changed the config while we have been waiting above. */ |
| 1881 | rcu_read_lock(); |
| 1882 | nc = rcu_dereference(connection->net_conf); |
| 1883 | cork = nc ? nc->tcp_cork : 0; |
| 1884 | rcu_read_unlock(); |
| 1885 | mutex_lock(&connection->data.mutex); |
| 1886 | if (connection->data.socket) { |
| 1887 | if (cork) |
| 1888 | drbd_tcp_cork(connection->data.socket); |
| 1889 | else if (!uncork) |
| 1890 | drbd_tcp_uncork(connection->data.socket); |
| 1891 | } |
| 1892 | mutex_unlock(&connection->data.mutex); |
| 1893 | } |
| 1894 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1895 | int drbd_worker(struct drbd_thread *thi) |
| 1896 | { |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1897 | struct drbd_connection *connection = thi->connection; |
Andreas Gruenbacher | 6db7e50 | 2011-08-26 23:50:08 +0200 | [diff] [blame] | 1898 | struct drbd_work *w = NULL; |
Andreas Gruenbacher | c06ece6 | 2011-06-21 17:23:59 +0200 | [diff] [blame] | 1899 | struct drbd_peer_device *peer_device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1900 | LIST_HEAD(work_list); |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1901 | int vnr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1902 | |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 1903 | while (get_t_state(thi) == RUNNING) { |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 1904 | drbd_thread_current_set_cpu(thi); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1905 | |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1906 | /* as long as we use drbd_queue_work_front(), |
| 1907 | * we may only dequeue single work items here, not batches. */ |
| 1908 | if (list_empty(&work_list)) |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1909 | wait_for_work(connection, &work_list); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1910 | |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1911 | if (signal_pending(current)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1912 | flush_signals(current); |
Philipp Reisner | 19393e1 | 2011-02-09 10:09:07 +0100 | [diff] [blame] | 1913 | if (get_t_state(thi) == RUNNING) { |
Andreas Gruenbacher | 1ec861e | 2011-07-06 11:01:44 +0200 | [diff] [blame] | 1914 | drbd_warn(connection, "Worker got an unexpected signal\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1915 | continue; |
Philipp Reisner | 19393e1 | 2011-02-09 10:09:07 +0100 | [diff] [blame] | 1916 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1917 | break; |
| 1918 | } |
| 1919 | |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 1920 | if (get_t_state(thi) != RUNNING) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1921 | break; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1922 | |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1923 | while (!list_empty(&work_list)) { |
Andreas Gruenbacher | 6db7e50 | 2011-08-26 23:50:08 +0200 | [diff] [blame] | 1924 | w = list_first_entry(&work_list, struct drbd_work, list); |
| 1925 | list_del_init(&w->list); |
| 1926 | if (w->cb(w, connection->cstate < C_WF_REPORT_PARAMS) == 0) |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1927 | continue; |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1928 | if (connection->cstate >= C_WF_REPORT_PARAMS) |
| 1929 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1930 | } |
| 1931 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1932 | |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1933 | do { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1934 | while (!list_empty(&work_list)) { |
Andreas Gruenbacher | 6db7e50 | 2011-08-26 23:50:08 +0200 | [diff] [blame] | 1935 | w = list_first_entry(&work_list, struct drbd_work, list); |
| 1936 | list_del_init(&w->list); |
| 1937 | w->cb(w, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1938 | } |
Andreas Gruenbacher | bde89a9 | 2011-05-30 16:32:41 +0200 | [diff] [blame] | 1939 | dequeue_work_batch(&connection->sender_work, &work_list); |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 1940 | } while (!list_empty(&work_list)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1941 | |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 1942 | rcu_read_lock(); |
Andreas Gruenbacher | c06ece6 | 2011-06-21 17:23:59 +0200 | [diff] [blame] | 1943 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| 1944 | struct drbd_device *device = peer_device->device; |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1945 | D_ASSERT(device, device->state.disk == D_DISKLESS && device->state.conn == C_STANDALONE); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1946 | kref_get(&device->kref); |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 1947 | rcu_read_unlock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1948 | drbd_device_cleanup(device); |
Andreas Gruenbacher | 05a10ec | 2011-06-07 22:54:17 +0200 | [diff] [blame] | 1949 | kref_put(&device->kref, drbd_destroy_device); |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 1950 | rcu_read_lock(); |
Philipp Reisner | 0e29d16 | 2011-02-18 14:23:11 +0100 | [diff] [blame] | 1951 | } |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 1952 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1953 | |
| 1954 | return 0; |
| 1955 | } |