| 1 | |
| 2 | |
| 3 | drbd_worker.c
|
| 4 |
|
| 5 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
|
| 6 |
|
| 7 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
|
| 8 | Copyright (C) 1999-2008, Philipp Reisner <[email protected]>.
|
| 9 | Copyright (C) 2002-2008, Lars Ellenberg <[email protected]>.
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| 10 |
|
| 11 |
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| 12 |
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| 13 |
|
| 14 | #include <linux/module.h>
|
| 15 | #include <linux/drbd.h>
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| 16 | #include <linux/sched/signal.h>
|
| 17 | #include <linux/wait.h>
|
| 18 | #include <linux/mm.h>
|
| 19 | #include <linux/memcontrol.h>
|
| 20 | #include <linux/mm_inline.h>
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| 21 | #include <linux/slab.h>
|
| 22 | #include <linux/random.h>
|
| 23 | #include <linux/string.h>
|
| 24 | #include <linux/scatterlist.h>
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| 25 | #include <linux/part_stat.h>
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| 26 |
|
| 27 | #include "drbd_int.h"
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| 28 | #include "drbd_protocol.h"
|
| 29 | #include "drbd_req.h"
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| 30 |
|
| 31 | static int make_ov_request(struct drbd_peer_device *, int);
|
| 32 | static int make_resync_request(struct drbd_peer_device *, int);
|
| 33 |
|
| 34 | |
| 35 | * drbd_md_endio (defined here)
|
| 36 | * drbd_request_endio (defined here)
|
| 37 | * drbd_peer_request_endio (defined here)
|
| 38 | * drbd_bm_endio (defined in drbd_bitmap.c)
|
| 39 | *
|
| 40 | * For all these callbacks, note the following:
|
| 41 | * The callbacks will be called in irq context by the IDE drivers,
|
| 42 | * and in Softirqs/Tasklets/BH context by the SCSI drivers.
|
| 43 | * Try to get the locking right :)
|
| 44 | *
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| 45 |
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| 46 |
|
| 47 | |
| 48 | * submitted by drbd_md_sync_page_io()
|
| 49 |
|
| 50 | void drbd_md_endio(struct bio *bio)
|
| 51 | {
|
| 52 | struct drbd_device *device;
|
| 53 |
|
| 54 | device = bio->bi_private;
|
| 55 | device->md_io.error = blk_status_to_errno(bio->bi_status);
|
| 56 |
|
| 57 |
|
| 58 | if (device->ldev)
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| 59 | put_ldev(device);
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| 60 | bio_put(bio);
|
| 61 |
|
| 62 | |
| 63 | * to timeout on the lower level device, and eventually detach from it.
|
| 64 | * If this io completion runs after that timeout expired, this
|
| 65 | * drbd_md_put_buffer() may allow us to finally try and re-attach.
|
| 66 | * During normal operation, this only puts that extra reference
|
| 67 | * down to 1 again.
|
| 68 | * Make sure we first drop the reference, and only then signal
|
| 69 | * completion, or we may (in drbd_al_read_log()) cycle so fast into the
|
| 70 | * next drbd_md_sync_page_io(), that we trigger the
|
| 71 | * ASSERT(atomic_read(&device->md_io_in_use) == 1) there.
|
| 72 |
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| 73 | drbd_md_put_buffer(device);
|
| 74 | device->md_io.done = 1;
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| 75 | wake_up(&device->misc_wait);
|
| 76 | }
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| 77 |
|
| 78 | |
| 79 | * "submitted" by the receiver
|
| 80 |
|
| 81 | static void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __releases(local)
|
| 82 | {
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| 83 | unsigned long flags = 0;
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| 84 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 85 | struct drbd_device *device = peer_device->device;
|
| 86 |
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| 87 | spin_lock_irqsave(&device->resource->req_lock, flags);
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| 88 | device->read_cnt += peer_req->i.size >> 9;
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| 89 | list_del(&peer_req->w.list);
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| 90 | if (list_empty(&device->read_ee))
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| 91 | wake_up(&device->ee_wait);
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| 92 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags))
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| 93 | __drbd_chk_io_error(device, DRBD_READ_ERROR);
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| 94 | spin_unlock_irqrestore(&device->resource->req_lock, flags);
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| 95 |
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| 96 | drbd_queue_work(&peer_device->connection->sender_work, &peer_req->w);
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| 97 | put_ldev(device);
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| 98 | }
|
| 99 |
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| 100 | |
| 101 | * "submitted" by the receiver, final stage.
|
| 102 | void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local)
|
| 103 | {
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| 104 | unsigned long flags = 0;
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| 105 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 106 | struct drbd_device *device = peer_device->device;
|
| 107 | struct drbd_connection *connection = peer_device->connection;
|
| 108 | struct drbd_interval i;
|
| 109 | int do_wake;
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| 110 | u64 block_id;
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| 111 | int do_al_complete_io;
|
| 112 |
|
| 113 | |
| 114 | * we may no longer access it,
|
| 115 | * it may be freed/reused already!
|
| 116 | * (as soon as we release the req_lock)
|
| 117 | i = peer_req->i;
|
| 118 | do_al_complete_io = peer_req->flags & EE_CALL_AL_COMPLETE_IO;
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| 119 | block_id = peer_req->block_id;
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| 120 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO;
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| 121 |
|
| 122 | if (peer_req->flags & EE_WAS_ERROR) {
|
| 123 | |
| 124 | * In case of a write error, send the neg ack anyways.
|
| 125 | if (!__test_and_set_bit(__EE_SEND_WRITE_ACK, &peer_req->flags))
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| 126 | inc_unacked(device);
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| 127 | drbd_set_out_of_sync(peer_device, peer_req->i.sector, peer_req->i.size);
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| 128 | }
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| 129 |
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| 130 | spin_lock_irqsave(&device->resource->req_lock, flags);
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| 131 | device->writ_cnt += peer_req->i.size >> 9;
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| 132 | list_move_tail(&peer_req->w.list, &device->done_ee);
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| 133 |
|
| 134 | |
| 135 | * Do not remove from the write_requests tree here: we did not send the
|
| 136 | * Ack yet and did not wake possibly waiting conflicting requests.
|
| 137 | * Removed from the tree from "drbd_process_done_ee" within the
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| 138 | * appropriate dw.cb (e_end_block/e_end_resync_block) or from
|
| 139 | * _drbd_clear_done_ee.
|
| 140 |
|
| 141 |
|
| 142 | do_wake = list_empty(block_id == ID_SYNCER ? &device->sync_ee : &device->active_ee);
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| 143 |
|
| 144 | |
| 145 | * ((peer_req->flags & (EE_WAS_ERROR|EE_TRIM)) == EE_WAS_ERROR)
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| 146 | if (peer_req->flags & EE_WAS_ERROR)
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| 147 | __drbd_chk_io_error(device, DRBD_WRITE_ERROR);
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| 148 |
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| 149 | if (connection->cstate >= C_WF_REPORT_PARAMS) {
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| 150 | kref_get(&device->kref);
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| 151 | if (!queue_work(connection->ack_sender, &peer_device->send_acks_work))
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| 152 | kref_put(&device->kref, drbd_destroy_device);
|
| 153 | }
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| 154 | spin_unlock_irqrestore(&device->resource->req_lock, flags);
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| 155 |
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| 156 | if (block_id == ID_SYNCER)
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| 157 | drbd_rs_complete_io(device, i.sector);
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| 158 |
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| 159 | if (do_wake)
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| 160 | wake_up(&device->ee_wait);
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| 161 |
|
| 162 | if (do_al_complete_io)
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| 163 | drbd_al_complete_io(device, &i);
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| 164 |
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| 165 | put_ldev(device);
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| 166 | }
|
| 167 |
|
| 168 | |
| 169 | * "submitted" by the receiver.
|
| 170 |
|
| 171 | void drbd_peer_request_endio(struct bio *bio)
|
| 172 | {
|
| 173 | struct drbd_peer_request *peer_req = bio->bi_private;
|
| 174 | struct drbd_device *device = peer_req->peer_device->device;
|
| 175 | bool is_write = bio_data_dir(bio) == WRITE;
|
| 176 | bool is_discard = bio_op(bio) == REQ_OP_WRITE_ZEROES ||
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| 177 | bio_op(bio) == REQ_OP_DISCARD;
|
| 178 |
|
| 179 | if (bio->bi_status && drbd_ratelimit())
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| 180 | drbd_warn(device, "%s: error=%d s=%llus\n",
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| 181 | is_write ? (is_discard ? "discard" : "write")
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| 182 | : "read", bio->bi_status,
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| 183 | (unsigned long long)peer_req->i.sector);
|
| 184 |
|
| 185 | if (bio->bi_status)
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| 186 | set_bit(__EE_WAS_ERROR, &peer_req->flags);
|
| 187 |
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| 188 | bio_put(bio);
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| 189 | if (atomic_dec_and_test(&peer_req->pending_bios)) {
|
| 190 | if (is_write)
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| 191 | drbd_endio_write_sec_final(peer_req);
|
| 192 | else
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| 193 | drbd_endio_read_sec_final(peer_req);
|
| 194 | }
|
| 195 | }
|
| 196 |
|
| 197 | static void
|
| 198 | drbd_panic_after_delayed_completion_of_aborted_request(struct drbd_device *device)
|
| 199 | {
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| 200 | panic("drbd%u %s/%u potential random memory corruption caused by delayed completion of aborted local request\n",
|
| 201 | device->minor, device->resource->name, device->vnr);
|
| 202 | }
|
| 203 |
|
| 204 | |
| 205 |
|
| 206 | void drbd_request_endio(struct bio *bio)
|
| 207 | {
|
| 208 | unsigned long flags;
|
| 209 | struct drbd_request *req = bio->bi_private;
|
| 210 | struct drbd_device *device = req->device;
|
| 211 | struct bio_and_error m;
|
| 212 | enum drbd_req_event what;
|
| 213 |
|
| 214 | |
| 215 | * but now was completed "successfully",
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| 216 | * chances are that this caused arbitrary data corruption.
|
| 217 | *
|
| 218 | * "aborting" requests, or force-detaching the disk, is intended for
|
| 219 | * completely blocked/hung local backing devices which do no longer
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| 220 | * complete requests at all, not even do error completions. In this
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| 221 | * situation, usually a hard-reset and failover is the only way out.
|
| 222 | *
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| 223 | * By "aborting", basically faking a local error-completion,
|
| 224 | * we allow for a more graceful swichover by cleanly migrating services.
|
| 225 | * Still the affected node has to be rebooted "soon".
|
| 226 | *
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| 227 | * By completing these requests, we allow the upper layers to re-use
|
| 228 | * the associated data pages.
|
| 229 | *
|
| 230 | * If later the local backing device "recovers", and now DMAs some data
|
| 231 | * from disk into the original request pages, in the best case it will
|
| 232 | * just put random data into unused pages; but typically it will corrupt
|
| 233 | * meanwhile completely unrelated data, causing all sorts of damage.
|
| 234 | *
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| 235 | * Which means delayed successful completion,
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| 236 | * especially for READ requests,
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| 237 | * is a reason to panic().
|
| 238 | *
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| 239 | * We assume that a delayed *error* completion is OK,
|
| 240 | * though we still will complain noisily about it.
|
| 241 |
|
| 242 | if (unlikely(req->rq_state & RQ_LOCAL_ABORTED)) {
|
| 243 | if (drbd_ratelimit())
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| 244 | drbd_emerg(device, "delayed completion of aborted local request; disk-timeout may be too aggressive\n");
|
| 245 |
|
| 246 | if (!bio->bi_status)
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| 247 | drbd_panic_after_delayed_completion_of_aborted_request(device);
|
| 248 | }
|
| 249 |
|
| 250 |
|
| 251 | if (unlikely(bio->bi_status)) {
|
| 252 | switch (bio_op(bio)) {
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| 253 | case REQ_OP_WRITE_ZEROES:
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| 254 | case REQ_OP_DISCARD:
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| 255 | if (bio->bi_status == BLK_STS_NOTSUPP)
|
| 256 | what = DISCARD_COMPLETED_NOTSUPP;
|
| 257 | else
|
| 258 | what = DISCARD_COMPLETED_WITH_ERROR;
|
| 259 | break;
|
| 260 | case REQ_OP_READ:
|
| 261 | if (bio->bi_opf & REQ_RAHEAD)
|
| 262 | what = READ_AHEAD_COMPLETED_WITH_ERROR;
|
| 263 | else
|
| 264 | what = READ_COMPLETED_WITH_ERROR;
|
| 265 | break;
|
| 266 | default:
|
| 267 | what = WRITE_COMPLETED_WITH_ERROR;
|
| 268 | break;
|
| 269 | }
|
| 270 | } else {
|
| 271 | what = COMPLETED_OK;
|
| 272 | }
|
| 273 |
|
| 274 | req->private_bio = ERR_PTR(blk_status_to_errno(bio->bi_status));
|
| 275 | bio_put(bio);
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| 276 |
|
| 277 |
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| 278 | spin_lock_irqsave(&device->resource->req_lock, flags);
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| 279 | __req_mod(req, what, NULL, &m);
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| 280 | spin_unlock_irqrestore(&device->resource->req_lock, flags);
|
| 281 | put_ldev(device);
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| 282 |
|
| 283 | if (m.bio)
|
| 284 | complete_master_bio(device, &m);
|
| 285 | }
|
| 286 |
|
| 287 | void drbd_csum_ee(struct crypto_shash *tfm, struct drbd_peer_request *peer_req, void *digest)
|
| 288 | {
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| 289 | SHASH_DESC_ON_STACK(desc, tfm);
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| 290 | struct page *page = peer_req->pages;
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| 291 | struct page *tmp;
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| 292 | unsigned len;
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| 293 | void *src;
|
| 294 |
|
| 295 | desc->tfm = tfm;
|
| 296 |
|
| 297 | crypto_shash_init(desc);
|
| 298 |
|
| 299 | src = kmap_atomic(page);
|
| 300 | while ((tmp = page_chain_next(page))) {
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| 301 |
|
| 302 | crypto_shash_update(desc, src, PAGE_SIZE);
|
| 303 | kunmap_atomic(src);
|
| 304 | page = tmp;
|
| 305 | src = kmap_atomic(page);
|
| 306 | }
|
| 307 |
|
| 308 | len = peer_req->i.size & (PAGE_SIZE - 1);
|
| 309 | crypto_shash_update(desc, src, len ?: PAGE_SIZE);
|
| 310 | kunmap_atomic(src);
|
| 311 |
|
| 312 | crypto_shash_final(desc, digest);
|
| 313 | shash_desc_zero(desc);
|
| 314 | }
|
| 315 |
|
| 316 | void drbd_csum_bio(struct crypto_shash *tfm, struct bio *bio, void *digest)
|
| 317 | {
|
| 318 | SHASH_DESC_ON_STACK(desc, tfm);
|
| 319 | struct bio_vec bvec;
|
| 320 | struct bvec_iter iter;
|
| 321 |
|
| 322 | desc->tfm = tfm;
|
| 323 |
|
| 324 | crypto_shash_init(desc);
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| 325 |
|
| 326 | bio_for_each_segment(bvec, bio, iter) {
|
| 327 | u8 *src;
|
| 328 |
|
| 329 | src = bvec_kmap_local(&bvec);
|
| 330 | crypto_shash_update(desc, src, bvec.bv_len);
|
| 331 | kunmap_local(src);
|
| 332 | }
|
| 333 | crypto_shash_final(desc, digest);
|
| 334 | shash_desc_zero(desc);
|
| 335 | }
|
| 336 |
|
| 337 |
|
| 338 | static int w_e_send_csum(struct drbd_work *w, int cancel)
|
| 339 | {
|
| 340 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w);
|
| 341 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 342 | struct drbd_device *device = peer_device->device;
|
| 343 | int digest_size;
|
| 344 | void *digest;
|
| 345 | int err = 0;
|
| 346 |
|
| 347 | if (unlikely(cancel))
|
| 348 | goto out;
|
| 349 |
|
| 350 | if (unlikely((peer_req->flags & EE_WAS_ERROR) != 0))
|
| 351 | goto out;
|
| 352 |
|
| 353 | digest_size = crypto_shash_digestsize(peer_device->connection->csums_tfm);
|
| 354 | digest = kmalloc(digest_size, GFP_NOIO);
|
| 355 | if (digest) {
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| 356 | sector_t sector = peer_req->i.sector;
|
| 357 | unsigned int size = peer_req->i.size;
|
| 358 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest);
|
| 359 | |
| 360 | * In case we block on congestion, we could otherwise run into
|
| 361 | * some distributed deadlock, if the other side blocks on
|
| 362 | * congestion as well, because our receiver blocks in
|
| 363 | * drbd_alloc_pages due to pp_in_use > max_buffers.
|
| 364 | drbd_free_peer_req(device, peer_req);
|
| 365 | peer_req = NULL;
|
| 366 | inc_rs_pending(peer_device);
|
| 367 | err = drbd_send_drequest_csum(peer_device, sector, size,
|
| 368 | digest, digest_size,
|
| 369 | P_CSUM_RS_REQUEST);
|
| 370 | kfree(digest);
|
| 371 | } else {
|
| 372 | drbd_err(device, "kmalloc() of digest failed.\n");
|
| 373 | err = -ENOMEM;
|
| 374 | }
|
| 375 |
|
| 376 | out:
|
| 377 | if (peer_req)
|
| 378 | drbd_free_peer_req(device, peer_req);
|
| 379 |
|
| 380 | if (unlikely(err))
|
| 381 | drbd_err(device, "drbd_send_drequest(..., csum) failed\n");
|
| 382 | return err;
|
| 383 | }
|
| 384 |
|
| 385 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
|
| 386 |
|
| 387 | static int read_for_csum(struct drbd_peer_device *peer_device, sector_t sector, int size)
|
| 388 | {
|
| 389 | struct drbd_device *device = peer_device->device;
|
| 390 | struct drbd_peer_request *peer_req;
|
| 391 |
|
| 392 | if (!get_ldev(device))
|
| 393 | return -EIO;
|
| 394 |
|
| 395 | |
| 396 | * be rescheduled for later. It is "only" background resync, after all.
|
| 397 | peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER , sector,
|
| 398 | size, size, GFP_TRY);
|
| 399 | if (!peer_req)
|
| 400 | goto defer;
|
| 401 |
|
| 402 | peer_req->w.cb = w_e_send_csum;
|
| 403 | peer_req->opf = REQ_OP_READ;
|
| 404 | spin_lock_irq(&device->resource->req_lock);
|
| 405 | list_add_tail(&peer_req->w.list, &device->read_ee);
|
| 406 | spin_unlock_irq(&device->resource->req_lock);
|
| 407 |
|
| 408 | atomic_add(size >> 9, &device->rs_sect_ev);
|
| 409 | if (drbd_submit_peer_request(peer_req) == 0)
|
| 410 | return 0;
|
| 411 |
|
| 412 | |
| 413 | * because bio_add_page failed (probably broken lower level driver),
|
| 414 | * retry may or may not help.
|
| 415 | * If it does not, you may need to force disconnect.
|
| 416 | spin_lock_irq(&device->resource->req_lock);
|
| 417 | list_del(&peer_req->w.list);
|
| 418 | spin_unlock_irq(&device->resource->req_lock);
|
| 419 |
|
| 420 | drbd_free_peer_req(device, peer_req);
|
| 421 | defer:
|
| 422 | put_ldev(device);
|
| 423 | return -EAGAIN;
|
| 424 | }
|
| 425 |
|
| 426 | int w_resync_timer(struct drbd_work *w, int cancel)
|
| 427 | {
|
| 428 | struct drbd_device *device =
|
| 429 | container_of(w, struct drbd_device, resync_work);
|
| 430 |
|
| 431 | switch (device->state.conn) {
|
| 432 | case C_VERIFY_S:
|
| 433 | make_ov_request(first_peer_device(device), cancel);
|
| 434 | break;
|
| 435 | case C_SYNC_TARGET:
|
| 436 | make_resync_request(first_peer_device(device), cancel);
|
| 437 | break;
|
| 438 | }
|
| 439 |
|
| 440 | return 0;
|
| 441 | }
|
| 442 |
|
| 443 | void resync_timer_fn(struct timer_list *t)
|
| 444 | {
|
| 445 | struct drbd_device *device = timer_container_of(device, t,
|
| 446 | resync_timer);
|
| 447 |
|
| 448 | drbd_queue_work_if_unqueued(
|
| 449 | &first_peer_device(device)->connection->sender_work,
|
| 450 | &device->resync_work);
|
| 451 | }
|
| 452 |
|
| 453 | static void fifo_set(struct fifo_buffer *fb, int value)
|
| 454 | {
|
| 455 | int i;
|
| 456 |
|
| 457 | for (i = 0; i < fb->size; i++)
|
| 458 | fb->values[i] = value;
|
| 459 | }
|
| 460 |
|
| 461 | static int fifo_push(struct fifo_buffer *fb, int value)
|
| 462 | {
|
| 463 | int ov;
|
| 464 |
|
| 465 | ov = fb->values[fb->head_index];
|
| 466 | fb->values[fb->head_index++] = value;
|
| 467 |
|
| 468 | if (fb->head_index >= fb->size)
|
| 469 | fb->head_index = 0;
|
| 470 |
|
| 471 | return ov;
|
| 472 | }
|
| 473 |
|
| 474 | static void fifo_add_val(struct fifo_buffer *fb, int value)
|
| 475 | {
|
| 476 | int i;
|
| 477 |
|
| 478 | for (i = 0; i < fb->size; i++)
|
| 479 | fb->values[i] += value;
|
| 480 | }
|
| 481 |
|
| 482 | struct fifo_buffer *fifo_alloc(unsigned int fifo_size)
|
| 483 | {
|
| 484 | struct fifo_buffer *fb;
|
| 485 |
|
| 486 | fb = kzalloc_flex(*fb, values, fifo_size, GFP_NOIO);
|
| 487 | if (!fb)
|
| 488 | return NULL;
|
| 489 |
|
| 490 | fb->head_index = 0;
|
| 491 | fb->size = fifo_size;
|
| 492 | fb->total = 0;
|
| 493 |
|
| 494 | return fb;
|
| 495 | }
|
| 496 |
|
| 497 | static int drbd_rs_controller(struct drbd_peer_device *peer_device, unsigned int sect_in)
|
| 498 | {
|
| 499 | struct drbd_device *device = peer_device->device;
|
| 500 | struct disk_conf *dc;
|
| 501 | unsigned int want;
|
| 502 | int req_sect;
|
| 503 | int correction;
|
| 504 | int cps;
|
| 505 | int steps;
|
| 506 | int curr_corr;
|
| 507 | int max_sect;
|
| 508 | struct fifo_buffer *plan;
|
| 509 |
|
| 510 | dc = rcu_dereference(device->ldev->disk_conf);
|
| 511 | plan = rcu_dereference(device->rs_plan_s);
|
| 512 |
|
| 513 | steps = plan->size;
|
| 514 |
|
| 515 | if (device->rs_in_flight + sect_in == 0) {
|
| 516 | want = ((dc->resync_rate * 2 * SLEEP_TIME) / HZ) * steps;
|
| 517 | } else {
|
| 518 | want = dc->c_fill_target ? dc->c_fill_target :
|
| 519 | sect_in * dc->c_delay_target * HZ / (SLEEP_TIME * 10);
|
| 520 | }
|
| 521 |
|
| 522 | correction = want - device->rs_in_flight - plan->total;
|
| 523 |
|
| 524 |
|
| 525 | cps = correction / steps;
|
| 526 | fifo_add_val(plan, cps);
|
| 527 | plan->total += cps * steps;
|
| 528 |
|
| 529 |
|
| 530 | curr_corr = fifo_push(plan, 0);
|
| 531 | plan->total -= curr_corr;
|
| 532 |
|
| 533 | req_sect = sect_in + curr_corr;
|
| 534 | if (req_sect < 0)
|
| 535 | req_sect = 0;
|
| 536 |
|
| 537 | max_sect = (dc->c_max_rate * 2 * SLEEP_TIME) / HZ;
|
| 538 | if (req_sect > max_sect)
|
| 539 | req_sect = max_sect;
|
| 540 |
|
| 541 | |
| 542 | drbd_warn(device, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n",
|
| 543 | sect_in, device->rs_in_flight, want, correction,
|
| 544 | steps, cps, device->rs_planed, curr_corr, req_sect);
|
| 545 |
|
| 546 |
|
| 547 | return req_sect;
|
| 548 | }
|
| 549 |
|
| 550 | static int drbd_rs_number_requests(struct drbd_peer_device *peer_device)
|
| 551 | {
|
| 552 | struct drbd_device *device = peer_device->device;
|
| 553 | unsigned int sect_in;
|
| 554 | int number, mxb;
|
| 555 |
|
| 556 | sect_in = atomic_xchg(&device->rs_sect_in, 0);
|
| 557 | device->rs_in_flight -= sect_in;
|
| 558 |
|
| 559 | rcu_read_lock();
|
| 560 | mxb = drbd_get_max_buffers(device) / 2;
|
| 561 | if (rcu_dereference(device->rs_plan_s)->size) {
|
| 562 | number = drbd_rs_controller(peer_device, sect_in) >> (BM_BLOCK_SHIFT - 9);
|
| 563 | device->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME;
|
| 564 | } else {
|
| 565 | device->c_sync_rate = rcu_dereference(device->ldev->disk_conf)->resync_rate;
|
| 566 | number = SLEEP_TIME * device->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ);
|
| 567 | }
|
| 568 | rcu_read_unlock();
|
| 569 |
|
| 570 | |
| 571 | * Otherwise we may cause the remote site to stall on drbd_alloc_pages(),
|
| 572 | * potentially causing a distributed deadlock on congestion during
|
| 573 | * online-verify or (checksum-based) resync, if max-buffers,
|
| 574 | * socket buffer sizes and resync rate settings are mis-configured.
|
| 575 |
|
| 576 | |
| 577 | * mxb (as used here, and in drbd_alloc_pages on the peer) is
|
| 578 | * "number of pages" (typically also 4k),
|
| 579 | * but "rs_in_flight" is in "sectors" (512 Byte).
|
| 580 | if (mxb - device->rs_in_flight/8 < number)
|
| 581 | number = mxb - device->rs_in_flight/8;
|
| 582 |
|
| 583 | return number;
|
| 584 | }
|
| 585 |
|
| 586 | static int make_resync_request(struct drbd_peer_device *const peer_device, int cancel)
|
| 587 | {
|
| 588 | struct drbd_device *const device = peer_device->device;
|
| 589 | struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
|
| 590 | unsigned long bit;
|
| 591 | sector_t sector;
|
| 592 | const sector_t capacity = get_capacity(device->vdisk);
|
| 593 | int max_bio_size;
|
| 594 | int number, rollback_i, size;
|
| 595 | int align, requeue = 0;
|
| 596 | int i = 0;
|
| 597 | int discard_granularity = 0;
|
| 598 |
|
| 599 | if (unlikely(cancel))
|
| 600 | return 0;
|
| 601 |
|
| 602 | if (device->rs_total == 0) {
|
| 603 |
|
| 604 | drbd_resync_finished(peer_device);
|
| 605 | return 0;
|
| 606 | }
|
| 607 |
|
| 608 | if (!get_ldev(device)) {
|
| 609 | |
| 610 | get_ldev_if_state(device,D_FAILED) would be sufficient, but
|
| 611 | to continue resync with a broken disk makes no sense at
|
| 612 | all
|
| 613 | drbd_err(device, "Disk broke down during resync!\n");
|
| 614 | return 0;
|
| 615 | }
|
| 616 |
|
| 617 | if (connection->agreed_features & DRBD_FF_THIN_RESYNC) {
|
| 618 | rcu_read_lock();
|
| 619 | discard_granularity = rcu_dereference(device->ldev->disk_conf)->rs_discard_granularity;
|
| 620 | rcu_read_unlock();
|
| 621 | }
|
| 622 |
|
| 623 | max_bio_size = queue_max_hw_sectors(device->rq_queue) << 9;
|
| 624 | number = drbd_rs_number_requests(peer_device);
|
| 625 | if (number <= 0)
|
| 626 | goto requeue;
|
| 627 |
|
| 628 | for (i = 0; i < number; i++) {
|
| 629 | |
| 630 | * but notify TCP that we'd like to have more space.
|
| 631 | mutex_lock(&connection->data.mutex);
|
| 632 | if (connection->data.socket) {
|
| 633 | struct sock *sk = connection->data.socket->sk;
|
| 634 | int queued = sk->sk_wmem_queued;
|
| 635 | int sndbuf = sk->sk_sndbuf;
|
| 636 | if (queued > sndbuf / 2) {
|
| 637 | requeue = 1;
|
| 638 | if (sk->sk_socket)
|
| 639 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
| 640 | }
|
| 641 | } else
|
| 642 | requeue = 1;
|
| 643 | mutex_unlock(&connection->data.mutex);
|
| 644 | if (requeue)
|
| 645 | goto requeue;
|
| 646 |
|
| 647 | next_sector:
|
| 648 | size = BM_BLOCK_SIZE;
|
| 649 | bit = drbd_bm_find_next(device, device->bm_resync_fo);
|
| 650 |
|
| 651 | if (bit == DRBD_END_OF_BITMAP) {
|
| 652 | device->bm_resync_fo = drbd_bm_bits(device);
|
| 653 | put_ldev(device);
|
| 654 | return 0;
|
| 655 | }
|
| 656 |
|
| 657 | sector = BM_BIT_TO_SECT(bit);
|
| 658 |
|
| 659 | if (drbd_try_rs_begin_io(peer_device, sector)) {
|
| 660 | device->bm_resync_fo = bit;
|
| 661 | goto requeue;
|
| 662 | }
|
| 663 | device->bm_resync_fo = bit + 1;
|
| 664 |
|
| 665 | if (unlikely(drbd_bm_test_bit(device, bit) == 0)) {
|
| 666 | drbd_rs_complete_io(device, sector);
|
| 667 | goto next_sector;
|
| 668 | }
|
| 669 |
|
| 670 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE
|
| 671 | |
| 672 | * we stop if we have already the maximum req size.
|
| 673 | *
|
| 674 | * Additionally always align bigger requests, in order to
|
| 675 | * be prepared for all stripe sizes of software RAIDs.
|
| 676 |
|
| 677 | align = 1;
|
| 678 | rollback_i = i;
|
| 679 | while (i < number) {
|
| 680 | if (size + BM_BLOCK_SIZE > max_bio_size)
|
| 681 | break;
|
| 682 |
|
| 683 |
|
| 684 | if (sector & ((1<<(align+3))-1))
|
| 685 | break;
|
| 686 |
|
| 687 | if (discard_granularity && size == discard_granularity)
|
| 688 | break;
|
| 689 |
|
| 690 |
|
| 691 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0)
|
| 692 | break;
|
| 693 | |
| 694 | * caution, drbd_bm_test_bit is tri-state for some
|
| 695 | * obscure reason; ( b == 0 ) would get the out-of-band
|
| 696 | * only accidentally right because of the "oddly sized"
|
| 697 | * adjustment below
|
| 698 | if (drbd_bm_test_bit(device, bit+1) != 1)
|
| 699 | break;
|
| 700 | bit++;
|
| 701 | size += BM_BLOCK_SIZE;
|
| 702 | if ((BM_BLOCK_SIZE << align) <= size)
|
| 703 | align++;
|
| 704 | i++;
|
| 705 | }
|
| 706 | |
| 707 | * reset the offset to start the next drbd_bm_find_next from
|
| 708 | if (size > BM_BLOCK_SIZE)
|
| 709 | device->bm_resync_fo = bit + 1;
|
| 710 | #endif
|
| 711 |
|
| 712 |
|
| 713 | if (sector + (size>>9) > capacity)
|
| 714 | size = (capacity-sector)<<9;
|
| 715 |
|
| 716 | if (device->use_csums) {
|
| 717 | switch (read_for_csum(peer_device, sector, size)) {
|
| 718 | case -EIO:
|
| 719 | put_ldev(device);
|
| 720 | return -EIO;
|
| 721 | case -EAGAIN:
|
| 722 | drbd_rs_complete_io(device, sector);
|
| 723 | device->bm_resync_fo = BM_SECT_TO_BIT(sector);
|
| 724 | i = rollback_i;
|
| 725 | goto requeue;
|
| 726 | case 0:
|
| 727 |
|
| 728 | break;
|
| 729 | default:
|
| 730 | BUG();
|
| 731 | }
|
| 732 | } else {
|
| 733 | int err;
|
| 734 |
|
| 735 | inc_rs_pending(peer_device);
|
| 736 | err = drbd_send_drequest(peer_device,
|
| 737 | size == discard_granularity ? P_RS_THIN_REQ : P_RS_DATA_REQUEST,
|
| 738 | sector, size, ID_SYNCER);
|
| 739 | if (err) {
|
| 740 | drbd_err(device, "drbd_send_drequest() failed, aborting...\n");
|
| 741 | dec_rs_pending(peer_device);
|
| 742 | put_ldev(device);
|
| 743 | return err;
|
| 744 | }
|
| 745 | }
|
| 746 | }
|
| 747 |
|
| 748 | if (device->bm_resync_fo >= drbd_bm_bits(device)) {
|
| 749 | |
| 750 | * but the P_RS_DATA_REPLY not yet received. sync will end (and
|
| 751 | * next sync group will resume), as soon as we receive the last
|
| 752 | * resync data block, and the last bit is cleared.
|
| 753 | * until then resync "work" is "inactive" ...
|
| 754 |
|
| 755 | put_ldev(device);
|
| 756 | return 0;
|
| 757 | }
|
| 758 |
|
| 759 | requeue:
|
| 760 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9));
|
| 761 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME);
|
| 762 | put_ldev(device);
|
| 763 | return 0;
|
| 764 | }
|
| 765 |
|
| 766 | static int make_ov_request(struct drbd_peer_device *peer_device, int cancel)
|
| 767 | {
|
| 768 | struct drbd_device *device = peer_device->device;
|
| 769 | int number, i, size;
|
| 770 | sector_t sector;
|
| 771 | const sector_t capacity = get_capacity(device->vdisk);
|
| 772 | bool stop_sector_reached = false;
|
| 773 |
|
| 774 | if (unlikely(cancel))
|
| 775 | return 1;
|
| 776 |
|
| 777 | number = drbd_rs_number_requests(peer_device);
|
| 778 |
|
| 779 | sector = device->ov_position;
|
| 780 | for (i = 0; i < number; i++) {
|
| 781 | if (sector >= capacity)
|
| 782 | return 1;
|
| 783 |
|
| 784 | |
| 785 | * w_e_end_ov_reply().
|
| 786 | * We need to send at least one request out.
|
| 787 | stop_sector_reached = i > 0
|
| 788 | && verify_can_do_stop_sector(device)
|
| 789 | && sector >= device->ov_stop_sector;
|
| 790 | if (stop_sector_reached)
|
| 791 | break;
|
| 792 |
|
| 793 | size = BM_BLOCK_SIZE;
|
| 794 |
|
| 795 | if (drbd_try_rs_begin_io(peer_device, sector)) {
|
| 796 | device->ov_position = sector;
|
| 797 | goto requeue;
|
| 798 | }
|
| 799 |
|
| 800 | if (sector + (size>>9) > capacity)
|
| 801 | size = (capacity-sector)<<9;
|
| 802 |
|
| 803 | inc_rs_pending(peer_device);
|
| 804 | if (drbd_send_ov_request(first_peer_device(device), sector, size)) {
|
| 805 | dec_rs_pending(peer_device);
|
| 806 | return 0;
|
| 807 | }
|
| 808 | sector += BM_SECT_PER_BIT;
|
| 809 | }
|
| 810 | device->ov_position = sector;
|
| 811 |
|
| 812 | requeue:
|
| 813 | device->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9));
|
| 814 | if (i == 0 || !stop_sector_reached)
|
| 815 | mod_timer(&device->resync_timer, jiffies + SLEEP_TIME);
|
| 816 | return 1;
|
| 817 | }
|
| 818 |
|
| 819 | int w_ov_finished(struct drbd_work *w, int cancel)
|
| 820 | {
|
| 821 | struct drbd_device_work *dw =
|
| 822 | container_of(w, struct drbd_device_work, w);
|
| 823 | struct drbd_device *device = dw->device;
|
| 824 | kfree(dw);
|
| 825 | ov_out_of_sync_print(first_peer_device(device));
|
| 826 | drbd_resync_finished(first_peer_device(device));
|
| 827 |
|
| 828 | return 0;
|
| 829 | }
|
| 830 |
|
| 831 | static int w_resync_finished(struct drbd_work *w, int cancel)
|
| 832 | {
|
| 833 | struct drbd_device_work *dw =
|
| 834 | container_of(w, struct drbd_device_work, w);
|
| 835 | struct drbd_device *device = dw->device;
|
| 836 | kfree(dw);
|
| 837 |
|
| 838 | drbd_resync_finished(first_peer_device(device));
|
| 839 |
|
| 840 | return 0;
|
| 841 | }
|
| 842 |
|
| 843 | static void ping_peer(struct drbd_device *device)
|
| 844 | {
|
| 845 | struct drbd_connection *connection = first_peer_device(device)->connection;
|
| 846 |
|
| 847 | clear_bit(GOT_PING_ACK, &connection->flags);
|
| 848 | request_ping(connection);
|
| 849 | wait_event(connection->ping_wait,
|
| 850 | test_bit(GOT_PING_ACK, &connection->flags) || device->state.conn < C_CONNECTED);
|
| 851 | }
|
| 852 |
|
| 853 | int drbd_resync_finished(struct drbd_peer_device *peer_device)
|
| 854 | {
|
| 855 | struct drbd_device *device = peer_device->device;
|
| 856 | struct drbd_connection *connection = peer_device->connection;
|
| 857 | unsigned long db, dt, dbdt;
|
| 858 | unsigned long n_oos;
|
| 859 | union drbd_state os, ns;
|
| 860 | struct drbd_device_work *dw;
|
| 861 | char *khelper_cmd = NULL;
|
| 862 | int verify_done = 0;
|
| 863 |
|
| 864 | |
| 865 | * might set bits in the (main) bitmap, then the entries in the
|
| 866 | * resync LRU would be wrong.
|
| 867 | if (drbd_rs_del_all(device)) {
|
| 868 | |
| 869 | * there are P_RS_DATA_REPLY Packets lingering on the worker's
|
| 870 | * queue (or even the read operations for those packets
|
| 871 | * is not finished by now). Retry in 100ms.
|
| 872 |
|
| 873 | schedule_timeout_interruptible(HZ / 10);
|
| 874 | dw = kmalloc_obj(struct drbd_device_work, GFP_ATOMIC);
|
| 875 | if (dw) {
|
| 876 | dw->w.cb = w_resync_finished;
|
| 877 | dw->device = device;
|
| 878 | drbd_queue_work(&connection->sender_work, &dw->w);
|
| 879 | return 1;
|
| 880 | }
|
| 881 | drbd_err(device, "Warn failed to drbd_rs_del_all() and to kmalloc(dw).\n");
|
| 882 | }
|
| 883 |
|
| 884 | dt = (jiffies - device->rs_start - device->rs_paused) / HZ;
|
| 885 | if (dt <= 0)
|
| 886 | dt = 1;
|
| 887 |
|
| 888 | db = device->rs_total;
|
| 889 |
|
| 890 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T)
|
| 891 | db -= device->ov_left;
|
| 892 |
|
| 893 | dbdt = Bit2KB(db/dt);
|
| 894 | device->rs_paused /= HZ;
|
| 895 |
|
| 896 | if (!get_ldev(device))
|
| 897 | goto out;
|
| 898 |
|
| 899 | ping_peer(device);
|
| 900 |
|
| 901 | spin_lock_irq(&device->resource->req_lock);
|
| 902 | os = drbd_read_state(device);
|
| 903 |
|
| 904 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T);
|
| 905 |
|
| 906 | |
| 907 | of application IO), and against connectivity loss just before we arrive here.
|
| 908 | if (os.conn <= C_CONNECTED)
|
| 909 | goto out_unlock;
|
| 910 |
|
| 911 | ns = os;
|
| 912 | ns.conn = C_CONNECTED;
|
| 913 |
|
| 914 | drbd_info(device, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n",
|
| 915 | verify_done ? "Online verify" : "Resync",
|
| 916 | dt + device->rs_paused, device->rs_paused, dbdt);
|
| 917 |
|
| 918 | n_oos = drbd_bm_total_weight(device);
|
| 919 |
|
| 920 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) {
|
| 921 | if (n_oos) {
|
| 922 | drbd_alert(device, "Online verify found %lu %dk block out of sync!\n",
|
| 923 | n_oos, Bit2KB(1));
|
| 924 | khelper_cmd = "out-of-sync";
|
| 925 | }
|
| 926 | } else {
|
| 927 | D_ASSERT(device, (n_oos - device->rs_failed) == 0);
|
| 928 |
|
| 929 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T)
|
| 930 | khelper_cmd = "after-resync-target";
|
| 931 |
|
| 932 | if (device->use_csums && device->rs_total) {
|
| 933 | const unsigned long s = device->rs_same_csum;
|
| 934 | const unsigned long t = device->rs_total;
|
| 935 | const int ratio =
|
| 936 | (t == 0) ? 0 :
|
| 937 | (t < 100000) ? ((s*100)/t) : (s/(t/100));
|
| 938 | drbd_info(device, "%u %% had equal checksums, eliminated: %luK; "
|
| 939 | "transferred %luK total %luK\n",
|
| 940 | ratio,
|
| 941 | Bit2KB(device->rs_same_csum),
|
| 942 | Bit2KB(device->rs_total - device->rs_same_csum),
|
| 943 | Bit2KB(device->rs_total));
|
| 944 | }
|
| 945 | }
|
| 946 |
|
| 947 | if (device->rs_failed) {
|
| 948 | drbd_info(device, " %lu failed blocks\n", device->rs_failed);
|
| 949 |
|
| 950 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) {
|
| 951 | ns.disk = D_INCONSISTENT;
|
| 952 | ns.pdsk = D_UP_TO_DATE;
|
| 953 | } else {
|
| 954 | ns.disk = D_UP_TO_DATE;
|
| 955 | ns.pdsk = D_INCONSISTENT;
|
| 956 | }
|
| 957 | } else {
|
| 958 | ns.disk = D_UP_TO_DATE;
|
| 959 | ns.pdsk = D_UP_TO_DATE;
|
| 960 |
|
| 961 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) {
|
| 962 | if (device->p_uuid) {
|
| 963 | int i;
|
| 964 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++)
|
| 965 | _drbd_uuid_set(device, i, device->p_uuid[i]);
|
| 966 | drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_CURRENT]);
|
| 967 | _drbd_uuid_set(device, UI_CURRENT, device->p_uuid[UI_CURRENT]);
|
| 968 | } else {
|
| 969 | drbd_err(device, "device->p_uuid is NULL! BUG\n");
|
| 970 | }
|
| 971 | }
|
| 972 |
|
| 973 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) {
|
| 974 | |
| 975 | * so there would be nothing to report.
|
| 976 | drbd_uuid_set_bm(device, 0UL);
|
| 977 | drbd_print_uuids(device, "updated UUIDs");
|
| 978 | if (device->p_uuid) {
|
| 979 | |
| 980 | * know of the peer.
|
| 981 | int i;
|
| 982 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++)
|
| 983 | device->p_uuid[i] = device->ldev->md.uuid[i];
|
| 984 | }
|
| 985 | }
|
| 986 | }
|
| 987 |
|
| 988 | _drbd_set_state(device, ns, CS_VERBOSE, NULL);
|
| 989 | out_unlock:
|
| 990 | spin_unlock_irq(&device->resource->req_lock);
|
| 991 |
|
| 992 | |
| 993 | * once *all* volumes are back in sync, call "unfence".
|
| 994 | if (os.conn == C_SYNC_SOURCE) {
|
| 995 | enum drbd_disk_state disk_state = D_MASK;
|
| 996 | enum drbd_disk_state pdsk_state = D_MASK;
|
| 997 | enum drbd_fencing_p fp = FP_DONT_CARE;
|
| 998 |
|
| 999 | rcu_read_lock();
|
| 1000 | fp = rcu_dereference(device->ldev->disk_conf)->fencing;
|
| 1001 | if (fp != FP_DONT_CARE) {
|
| 1002 | struct drbd_peer_device *peer_device;
|
| 1003 | int vnr;
|
| 1004 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
|
| 1005 | struct drbd_device *device = peer_device->device;
|
| 1006 | disk_state = min_t(enum drbd_disk_state, disk_state, device->state.disk);
|
| 1007 | pdsk_state = min_t(enum drbd_disk_state, pdsk_state, device->state.pdsk);
|
| 1008 | }
|
| 1009 | }
|
| 1010 | rcu_read_unlock();
|
| 1011 | if (disk_state == D_UP_TO_DATE && pdsk_state == D_UP_TO_DATE)
|
| 1012 | conn_khelper(connection, "unfence-peer");
|
| 1013 | }
|
| 1014 |
|
| 1015 | put_ldev(device);
|
| 1016 | out:
|
| 1017 | device->rs_total = 0;
|
| 1018 | device->rs_failed = 0;
|
| 1019 | device->rs_paused = 0;
|
| 1020 |
|
| 1021 |
|
| 1022 | if (verify_done && device->ov_left == 0)
|
| 1023 | device->ov_start_sector = 0;
|
| 1024 |
|
| 1025 | drbd_md_sync(device);
|
| 1026 |
|
| 1027 | if (khelper_cmd)
|
| 1028 | drbd_khelper(device, khelper_cmd);
|
| 1029 |
|
| 1030 | return 1;
|
| 1031 | }
|
| 1032 |
|
| 1033 | |
| 1034 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST
|
| 1035 | * @w: work object.
|
| 1036 | * @cancel: The connection will be closed anyways
|
| 1037 |
|
| 1038 | int w_e_end_data_req(struct drbd_work *w, int cancel)
|
| 1039 | {
|
| 1040 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w);
|
| 1041 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 1042 | struct drbd_device *device = peer_device->device;
|
| 1043 | int err;
|
| 1044 |
|
| 1045 | if (unlikely(cancel)) {
|
| 1046 | err = 0;
|
| 1047 | goto out;
|
| 1048 | }
|
| 1049 |
|
| 1050 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) {
|
| 1051 | err = drbd_send_block(peer_device, P_DATA_REPLY, peer_req);
|
| 1052 | } else {
|
| 1053 | if (drbd_ratelimit())
|
| 1054 | drbd_err(device, "Sending NegDReply. sector=%llus.\n",
|
| 1055 | (unsigned long long)peer_req->i.sector);
|
| 1056 |
|
| 1057 | err = drbd_send_ack(peer_device, P_NEG_DREPLY, peer_req);
|
| 1058 | }
|
| 1059 |
|
| 1060 | if (unlikely(err))
|
| 1061 | drbd_err(device, "drbd_send_block() failed\n");
|
| 1062 | out:
|
| 1063 | dec_unacked(device);
|
| 1064 | drbd_free_peer_req(device, peer_req);
|
| 1065 |
|
| 1066 | return err;
|
| 1067 | }
|
| 1068 |
|
| 1069 | static bool all_zero(struct drbd_peer_request *peer_req)
|
| 1070 | {
|
| 1071 | struct page *page = peer_req->pages;
|
| 1072 | unsigned int len = peer_req->i.size;
|
| 1073 |
|
| 1074 | page_chain_for_each(page) {
|
| 1075 | unsigned int l = min_t(unsigned int, len, PAGE_SIZE);
|
| 1076 | unsigned int i, words = l / sizeof(long);
|
| 1077 | unsigned long *d;
|
| 1078 |
|
| 1079 | d = kmap_atomic(page);
|
| 1080 | for (i = 0; i < words; i++) {
|
| 1081 | if (d[i]) {
|
| 1082 | kunmap_atomic(d);
|
| 1083 | return false;
|
| 1084 | }
|
| 1085 | }
|
| 1086 | kunmap_atomic(d);
|
| 1087 | len -= l;
|
| 1088 | }
|
| 1089 |
|
| 1090 | return true;
|
| 1091 | }
|
| 1092 |
|
| 1093 | |
| 1094 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUEST
|
| 1095 | * @w: work object.
|
| 1096 | * @cancel: The connection will be closed anyways
|
| 1097 |
|
| 1098 | int w_e_end_rsdata_req(struct drbd_work *w, int cancel)
|
| 1099 | {
|
| 1100 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w);
|
| 1101 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 1102 | struct drbd_device *device = peer_device->device;
|
| 1103 | int err;
|
| 1104 |
|
| 1105 | if (unlikely(cancel)) {
|
| 1106 | err = 0;
|
| 1107 | goto out;
|
| 1108 | }
|
| 1109 |
|
| 1110 | if (get_ldev_if_state(device, D_FAILED)) {
|
| 1111 | drbd_rs_complete_io(device, peer_req->i.sector);
|
| 1112 | put_ldev(device);
|
| 1113 | }
|
| 1114 |
|
| 1115 | if (device->state.conn == C_AHEAD) {
|
| 1116 | err = drbd_send_ack(peer_device, P_RS_CANCEL, peer_req);
|
| 1117 | } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) {
|
| 1118 | if (likely(device->state.pdsk >= D_INCONSISTENT)) {
|
| 1119 | inc_rs_pending(peer_device);
|
| 1120 | if (peer_req->flags & EE_RS_THIN_REQ && all_zero(peer_req))
|
| 1121 | err = drbd_send_rs_deallocated(peer_device, peer_req);
|
| 1122 | else
|
| 1123 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req);
|
| 1124 | } else {
|
| 1125 | if (drbd_ratelimit())
|
| 1126 | drbd_err(device, "Not sending RSDataReply, "
|
| 1127 | "partner DISKLESS!\n");
|
| 1128 | err = 0;
|
| 1129 | }
|
| 1130 | } else {
|
| 1131 | if (drbd_ratelimit())
|
| 1132 | drbd_err(device, "Sending NegRSDReply. sector %llus.\n",
|
| 1133 | (unsigned long long)peer_req->i.sector);
|
| 1134 |
|
| 1135 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req);
|
| 1136 |
|
| 1137 |
|
| 1138 | drbd_rs_failed_io(peer_device, peer_req->i.sector, peer_req->i.size);
|
| 1139 | }
|
| 1140 | if (unlikely(err))
|
| 1141 | drbd_err(device, "drbd_send_block() failed\n");
|
| 1142 | out:
|
| 1143 | dec_unacked(device);
|
| 1144 | drbd_free_peer_req(device, peer_req);
|
| 1145 |
|
| 1146 | return err;
|
| 1147 | }
|
| 1148 |
|
| 1149 | int w_e_end_csum_rs_req(struct drbd_work *w, int cancel)
|
| 1150 | {
|
| 1151 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w);
|
| 1152 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 1153 | struct drbd_device *device = peer_device->device;
|
| 1154 | struct digest_info *di;
|
| 1155 | int digest_size;
|
| 1156 | void *digest = NULL;
|
| 1157 | int err, eq = 0;
|
| 1158 |
|
| 1159 | if (unlikely(cancel)) {
|
| 1160 | err = 0;
|
| 1161 | goto out;
|
| 1162 | }
|
| 1163 |
|
| 1164 | if (get_ldev(device)) {
|
| 1165 | drbd_rs_complete_io(device, peer_req->i.sector);
|
| 1166 | put_ldev(device);
|
| 1167 | }
|
| 1168 |
|
| 1169 | di = peer_req->digest;
|
| 1170 |
|
| 1171 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) {
|
| 1172 | |
| 1173 | * a real fix would be much more involved,
|
| 1174 | * introducing more locking mechanisms
|
| 1175 | if (peer_device->connection->csums_tfm) {
|
| 1176 | digest_size = crypto_shash_digestsize(peer_device->connection->csums_tfm);
|
| 1177 | D_ASSERT(device, digest_size == di->digest_size);
|
| 1178 | digest = kmalloc(digest_size, GFP_NOIO);
|
| 1179 | }
|
| 1180 | if (digest) {
|
| 1181 | drbd_csum_ee(peer_device->connection->csums_tfm, peer_req, digest);
|
| 1182 | eq = !memcmp(digest, di->digest, digest_size);
|
| 1183 | kfree(digest);
|
| 1184 | }
|
| 1185 |
|
| 1186 | if (eq) {
|
| 1187 | drbd_set_in_sync(peer_device, peer_req->i.sector, peer_req->i.size);
|
| 1188 |
|
| 1189 | device->rs_same_csum += peer_req->i.size >> BM_BLOCK_SHIFT;
|
| 1190 | err = drbd_send_ack(peer_device, P_RS_IS_IN_SYNC, peer_req);
|
| 1191 | } else {
|
| 1192 | inc_rs_pending(peer_device);
|
| 1193 | peer_req->block_id = ID_SYNCER;
|
| 1194 | peer_req->flags &= ~EE_HAS_DIGEST;
|
| 1195 | kfree(di);
|
| 1196 | err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req);
|
| 1197 | }
|
| 1198 | } else {
|
| 1199 | err = drbd_send_ack(peer_device, P_NEG_RS_DREPLY, peer_req);
|
| 1200 | if (drbd_ratelimit())
|
| 1201 | drbd_err(device, "Sending NegDReply. I guess it gets messy.\n");
|
| 1202 | }
|
| 1203 | if (unlikely(err))
|
| 1204 | drbd_err(device, "drbd_send_block/ack() failed\n");
|
| 1205 | out:
|
| 1206 | dec_unacked(device);
|
| 1207 | drbd_free_peer_req(device, peer_req);
|
| 1208 |
|
| 1209 | return err;
|
| 1210 | }
|
| 1211 |
|
| 1212 | int w_e_end_ov_req(struct drbd_work *w, int cancel)
|
| 1213 | {
|
| 1214 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w);
|
| 1215 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 1216 | struct drbd_device *device = peer_device->device;
|
| 1217 | sector_t sector = peer_req->i.sector;
|
| 1218 | unsigned int size = peer_req->i.size;
|
| 1219 | int digest_size;
|
| 1220 | void *digest;
|
| 1221 | int err = 0;
|
| 1222 |
|
| 1223 | if (unlikely(cancel))
|
| 1224 | goto out;
|
| 1225 |
|
| 1226 | digest_size = crypto_shash_digestsize(peer_device->connection->verify_tfm);
|
| 1227 | digest = kmalloc(digest_size, GFP_NOIO);
|
| 1228 | if (!digest) {
|
| 1229 | err = 1;
|
| 1230 | goto out;
|
| 1231 | }
|
| 1232 |
|
| 1233 | if (likely(!(peer_req->flags & EE_WAS_ERROR)))
|
| 1234 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest);
|
| 1235 | else
|
| 1236 | memset(digest, 0, digest_size);
|
| 1237 |
|
| 1238 | |
| 1239 | * In case we block on congestion, we could otherwise run into
|
| 1240 | * some distributed deadlock, if the other side blocks on
|
| 1241 | * congestion as well, because our receiver blocks in
|
| 1242 | * drbd_alloc_pages due to pp_in_use > max_buffers.
|
| 1243 | drbd_free_peer_req(device, peer_req);
|
| 1244 | peer_req = NULL;
|
| 1245 | inc_rs_pending(peer_device);
|
| 1246 | err = drbd_send_drequest_csum(peer_device, sector, size, digest, digest_size, P_OV_REPLY);
|
| 1247 | if (err)
|
| 1248 | dec_rs_pending(peer_device);
|
| 1249 | kfree(digest);
|
| 1250 |
|
| 1251 | out:
|
| 1252 | if (peer_req)
|
| 1253 | drbd_free_peer_req(device, peer_req);
|
| 1254 | dec_unacked(device);
|
| 1255 | return err;
|
| 1256 | }
|
| 1257 |
|
| 1258 | void drbd_ov_out_of_sync_found(struct drbd_peer_device *peer_device, sector_t sector, int size)
|
| 1259 | {
|
| 1260 | struct drbd_device *device = peer_device->device;
|
| 1261 | if (device->ov_last_oos_start + device->ov_last_oos_size == sector) {
|
| 1262 | device->ov_last_oos_size += size>>9;
|
| 1263 | } else {
|
| 1264 | device->ov_last_oos_start = sector;
|
| 1265 | device->ov_last_oos_size = size>>9;
|
| 1266 | }
|
| 1267 | drbd_set_out_of_sync(peer_device, sector, size);
|
| 1268 | }
|
| 1269 |
|
| 1270 | int w_e_end_ov_reply(struct drbd_work *w, int cancel)
|
| 1271 | {
|
| 1272 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w);
|
| 1273 | struct drbd_peer_device *peer_device = peer_req->peer_device;
|
| 1274 | struct drbd_device *device = peer_device->device;
|
| 1275 | struct digest_info *di;
|
| 1276 | void *digest;
|
| 1277 | sector_t sector = peer_req->i.sector;
|
| 1278 | unsigned int size = peer_req->i.size;
|
| 1279 | int digest_size;
|
| 1280 | int err, eq = 0;
|
| 1281 | bool stop_sector_reached = false;
|
| 1282 |
|
| 1283 | if (unlikely(cancel)) {
|
| 1284 | drbd_free_peer_req(device, peer_req);
|
| 1285 | dec_unacked(device);
|
| 1286 | return 0;
|
| 1287 | }
|
| 1288 |
|
| 1289 | |
| 1290 | * the resync lru has been cleaned up already
|
| 1291 | if (get_ldev(device)) {
|
| 1292 | drbd_rs_complete_io(device, peer_req->i.sector);
|
| 1293 | put_ldev(device);
|
| 1294 | }
|
| 1295 |
|
| 1296 | di = peer_req->digest;
|
| 1297 |
|
| 1298 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) {
|
| 1299 | digest_size = crypto_shash_digestsize(peer_device->connection->verify_tfm);
|
| 1300 | digest = kmalloc(digest_size, GFP_NOIO);
|
| 1301 | if (digest) {
|
| 1302 | drbd_csum_ee(peer_device->connection->verify_tfm, peer_req, digest);
|
| 1303 |
|
| 1304 | D_ASSERT(device, digest_size == di->digest_size);
|
| 1305 | eq = !memcmp(digest, di->digest, digest_size);
|
| 1306 | kfree(digest);
|
| 1307 | }
|
| 1308 | }
|
| 1309 |
|
| 1310 | |
| 1311 | * In case we block on congestion, we could otherwise run into
|
| 1312 | * some distributed deadlock, if the other side blocks on
|
| 1313 | * congestion as well, because our receiver blocks in
|
| 1314 | * drbd_alloc_pages due to pp_in_use > max_buffers.
|
| 1315 | drbd_free_peer_req(device, peer_req);
|
| 1316 | if (!eq)
|
| 1317 | drbd_ov_out_of_sync_found(peer_device, sector, size);
|
| 1318 | else
|
| 1319 | ov_out_of_sync_print(peer_device);
|
| 1320 |
|
| 1321 | err = drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size,
|
| 1322 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC);
|
| 1323 |
|
| 1324 | dec_unacked(device);
|
| 1325 |
|
| 1326 | --device->ov_left;
|
| 1327 |
|
| 1328 |
|
| 1329 | if ((device->ov_left & 0x200) == 0x200)
|
| 1330 | drbd_advance_rs_marks(peer_device, device->ov_left);
|
| 1331 |
|
| 1332 | stop_sector_reached = verify_can_do_stop_sector(device) &&
|
| 1333 | (sector + (size>>9)) >= device->ov_stop_sector;
|
| 1334 |
|
| 1335 | if (device->ov_left == 0 || stop_sector_reached) {
|
| 1336 | ov_out_of_sync_print(peer_device);
|
| 1337 | drbd_resync_finished(peer_device);
|
| 1338 | }
|
| 1339 |
|
| 1340 | return err;
|
| 1341 | }
|
| 1342 |
|
| 1343 | |
| 1344 | * We need to track the number of pending barrier acks,
|
| 1345 | * and to be able to wait for them.
|
| 1346 | * See also comment in drbd_adm_attach before drbd_suspend_io.
|
| 1347 |
|
| 1348 | static int drbd_send_barrier(struct drbd_connection *connection)
|
| 1349 | {
|
| 1350 | struct p_barrier *p;
|
| 1351 | struct drbd_socket *sock;
|
| 1352 |
|
| 1353 | sock = &connection->data;
|
| 1354 | p = conn_prepare_command(connection, sock);
|
| 1355 | if (!p)
|
| 1356 | return -EIO;
|
| 1357 | p->barrier = connection->send.current_epoch_nr;
|
| 1358 | p->pad = 0;
|
| 1359 | connection->send.current_epoch_writes = 0;
|
| 1360 | connection->send.last_sent_barrier_jif = jiffies;
|
| 1361 |
|
| 1362 | return conn_send_command(connection, sock, P_BARRIER, sizeof(*p), NULL, 0);
|
| 1363 | }
|
| 1364 |
|
| 1365 | static int pd_send_unplug_remote(struct drbd_peer_device *pd)
|
| 1366 | {
|
| 1367 | struct drbd_socket *sock = &pd->connection->data;
|
| 1368 | if (!drbd_prepare_command(pd, sock))
|
| 1369 | return -EIO;
|
| 1370 | return drbd_send_command(pd, sock, P_UNPLUG_REMOTE, 0, NULL, 0);
|
| 1371 | }
|
| 1372 |
|
| 1373 | int w_send_write_hint(struct drbd_work *w, int cancel)
|
| 1374 | {
|
| 1375 | struct drbd_device *device =
|
| 1376 | container_of(w, struct drbd_device, unplug_work);
|
| 1377 |
|
| 1378 | if (cancel)
|
| 1379 | return 0;
|
| 1380 | return pd_send_unplug_remote(first_peer_device(device));
|
| 1381 | }
|
| 1382 |
|
| 1383 | static void re_init_if_first_write(struct drbd_connection *connection, unsigned int epoch)
|
| 1384 | {
|
| 1385 | if (!connection->send.seen_any_write_yet) {
|
| 1386 | connection->send.seen_any_write_yet = true;
|
| 1387 | connection->send.current_epoch_nr = epoch;
|
| 1388 | connection->send.current_epoch_writes = 0;
|
| 1389 | connection->send.last_sent_barrier_jif = jiffies;
|
| 1390 | }
|
| 1391 | }
|
| 1392 |
|
| 1393 | static void maybe_send_barrier(struct drbd_connection *connection, unsigned int epoch)
|
| 1394 | {
|
| 1395 |
|
| 1396 | if (!connection->send.seen_any_write_yet)
|
| 1397 | return;
|
| 1398 | if (connection->send.current_epoch_nr != epoch) {
|
| 1399 | if (connection->send.current_epoch_writes)
|
| 1400 | drbd_send_barrier(connection);
|
| 1401 | connection->send.current_epoch_nr = epoch;
|
| 1402 | }
|
| 1403 | }
|
| 1404 |
|
| 1405 | int w_send_out_of_sync(struct drbd_work *w, int cancel)
|
| 1406 | {
|
| 1407 | struct drbd_request *req = container_of(w, struct drbd_request, w);
|
| 1408 | struct drbd_device *device = req->device;
|
| 1409 | struct drbd_peer_device *const peer_device = first_peer_device(device);
|
| 1410 | struct drbd_connection *const connection = peer_device->connection;
|
| 1411 | int err;
|
| 1412 |
|
| 1413 | if (unlikely(cancel)) {
|
| 1414 | req_mod(req, SEND_CANCELED, peer_device);
|
| 1415 | return 0;
|
| 1416 | }
|
| 1417 | req->pre_send_jif = jiffies;
|
| 1418 |
|
| 1419 | |
| 1420 | * If it was sent, it was the closing barrier for the last
|
| 1421 | * replicated epoch, before we went into AHEAD mode.
|
| 1422 | * No more barriers will be sent, until we leave AHEAD mode again.
|
| 1423 | maybe_send_barrier(connection, req->epoch);
|
| 1424 |
|
| 1425 | err = drbd_send_out_of_sync(peer_device, req);
|
| 1426 | req_mod(req, OOS_HANDED_TO_NETWORK, peer_device);
|
| 1427 |
|
| 1428 | return err;
|
| 1429 | }
|
| 1430 |
|
| 1431 | |
| 1432 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request
|
| 1433 | * @w: work object.
|
| 1434 | * @cancel: The connection will be closed anyways
|
| 1435 |
|
| 1436 | int w_send_dblock(struct drbd_work *w, int cancel)
|
| 1437 | {
|
| 1438 | struct drbd_request *req = container_of(w, struct drbd_request, w);
|
| 1439 | struct drbd_device *device = req->device;
|
| 1440 | struct drbd_peer_device *const peer_device = first_peer_device(device);
|
| 1441 | struct drbd_connection *connection = peer_device->connection;
|
| 1442 | bool do_send_unplug = req->rq_state & RQ_UNPLUG;
|
| 1443 | int err;
|
| 1444 |
|
| 1445 | if (unlikely(cancel)) {
|
| 1446 | req_mod(req, SEND_CANCELED, peer_device);
|
| 1447 | return 0;
|
| 1448 | }
|
| 1449 | req->pre_send_jif = jiffies;
|
| 1450 |
|
| 1451 | re_init_if_first_write(connection, req->epoch);
|
| 1452 | maybe_send_barrier(connection, req->epoch);
|
| 1453 | connection->send.current_epoch_writes++;
|
| 1454 |
|
| 1455 | err = drbd_send_dblock(peer_device, req);
|
| 1456 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK, peer_device);
|
| 1457 |
|
| 1458 | if (do_send_unplug && !err)
|
| 1459 | pd_send_unplug_remote(peer_device);
|
| 1460 |
|
| 1461 | return err;
|
| 1462 | }
|
| 1463 |
|
| 1464 | |
| 1465 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet
|
| 1466 | * @w: work object.
|
| 1467 | * @cancel: The connection will be closed anyways
|
| 1468 |
|
| 1469 | int w_send_read_req(struct drbd_work *w, int cancel)
|
| 1470 | {
|
| 1471 | struct drbd_request *req = container_of(w, struct drbd_request, w);
|
| 1472 | struct drbd_device *device = req->device;
|
| 1473 | struct drbd_peer_device *const peer_device = first_peer_device(device);
|
| 1474 | struct drbd_connection *connection = peer_device->connection;
|
| 1475 | bool do_send_unplug = req->rq_state & RQ_UNPLUG;
|
| 1476 | int err;
|
| 1477 |
|
| 1478 | if (unlikely(cancel)) {
|
| 1479 | req_mod(req, SEND_CANCELED, peer_device);
|
| 1480 | return 0;
|
| 1481 | }
|
| 1482 | req->pre_send_jif = jiffies;
|
| 1483 |
|
| 1484 | |
| 1485 | * if there was any yet.
|
| 1486 | maybe_send_barrier(connection, req->epoch);
|
| 1487 |
|
| 1488 | err = drbd_send_drequest(peer_device, P_DATA_REQUEST, req->i.sector, req->i.size,
|
| 1489 | (unsigned long)req);
|
| 1490 |
|
| 1491 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK, peer_device);
|
| 1492 |
|
| 1493 | if (do_send_unplug && !err)
|
| 1494 | pd_send_unplug_remote(peer_device);
|
| 1495 |
|
| 1496 | return err;
|
| 1497 | }
|
| 1498 |
|
| 1499 | int w_restart_disk_io(struct drbd_work *w, int cancel)
|
| 1500 | {
|
| 1501 | struct drbd_request *req = container_of(w, struct drbd_request, w);
|
| 1502 | struct drbd_device *device = req->device;
|
| 1503 |
|
| 1504 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG)
|
| 1505 | drbd_al_begin_io(device, &req->i);
|
| 1506 |
|
| 1507 | req->private_bio = bio_alloc_clone(device->ldev->backing_bdev,
|
| 1508 | req->master_bio, GFP_NOIO,
|
| 1509 | &drbd_io_bio_set);
|
| 1510 | req->private_bio->bi_private = req;
|
| 1511 | req->private_bio->bi_end_io = drbd_request_endio;
|
| 1512 | submit_bio_noacct(req->private_bio);
|
| 1513 |
|
| 1514 | return 0;
|
| 1515 | }
|
| 1516 |
|
| 1517 | static int _drbd_may_sync_now(struct drbd_device *device)
|
| 1518 | {
|
| 1519 | struct drbd_device *odev = device;
|
| 1520 | int resync_after;
|
| 1521 |
|
| 1522 | while (1) {
|
| 1523 | if (!odev->ldev || odev->state.disk == D_DISKLESS)
|
| 1524 | return 1;
|
| 1525 | rcu_read_lock();
|
| 1526 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after;
|
| 1527 | rcu_read_unlock();
|
| 1528 | if (resync_after == -1)
|
| 1529 | return 1;
|
| 1530 | odev = minor_to_device(resync_after);
|
| 1531 | if (!odev)
|
| 1532 | return 1;
|
| 1533 | if ((odev->state.conn >= C_SYNC_SOURCE &&
|
| 1534 | odev->state.conn <= C_PAUSED_SYNC_T) ||
|
| 1535 | odev->state.aftr_isp || odev->state.peer_isp ||
|
| 1536 | odev->state.user_isp)
|
| 1537 | return 0;
|
| 1538 | }
|
| 1539 | }
|
| 1540 |
|
| 1541 | |
| 1542 | * drbd_pause_after() - Pause resync on all devices that may not resync now
|
| 1543 | * @device: DRBD device.
|
| 1544 | *
|
| 1545 | * Called from process context only (admin command and after_state_ch).
|
| 1546 |
|
| 1547 | static bool drbd_pause_after(struct drbd_device *device)
|
| 1548 | {
|
| 1549 | bool changed = false;
|
| 1550 | struct drbd_device *odev;
|
| 1551 | int i;
|
| 1552 |
|
| 1553 | rcu_read_lock();
|
| 1554 | idr_for_each_entry(&drbd_devices, odev, i) {
|
| 1555 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS)
|
| 1556 | continue;
|
| 1557 | if (!_drbd_may_sync_now(odev) &&
|
| 1558 | _drbd_set_state(_NS(odev, aftr_isp, 1),
|
| 1559 | CS_HARD, NULL) != SS_NOTHING_TO_DO)
|
| 1560 | changed = true;
|
| 1561 | }
|
| 1562 | rcu_read_unlock();
|
| 1563 |
|
| 1564 | return changed;
|
| 1565 | }
|
| 1566 |
|
| 1567 | |
| 1568 | * drbd_resume_next() - Resume resync on all devices that may resync now
|
| 1569 | * @device: DRBD device.
|
| 1570 | *
|
| 1571 | * Called from process context only (admin command and worker).
|
| 1572 |
|
| 1573 | static bool drbd_resume_next(struct drbd_device *device)
|
| 1574 | {
|
| 1575 | bool changed = false;
|
| 1576 | struct drbd_device *odev;
|
| 1577 | int i;
|
| 1578 |
|
| 1579 | rcu_read_lock();
|
| 1580 | idr_for_each_entry(&drbd_devices, odev, i) {
|
| 1581 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS)
|
| 1582 | continue;
|
| 1583 | if (odev->state.aftr_isp) {
|
| 1584 | if (_drbd_may_sync_now(odev) &&
|
| 1585 | _drbd_set_state(_NS(odev, aftr_isp, 0),
|
| 1586 | CS_HARD, NULL) != SS_NOTHING_TO_DO)
|
| 1587 | changed = true;
|
| 1588 | }
|
| 1589 | }
|
| 1590 | rcu_read_unlock();
|
| 1591 | return changed;
|
| 1592 | }
|
| 1593 |
|
| 1594 | void resume_next_sg(struct drbd_device *device)
|
| 1595 | {
|
| 1596 | lock_all_resources();
|
| 1597 | drbd_resume_next(device);
|
| 1598 | unlock_all_resources();
|
| 1599 | }
|
| 1600 |
|
| 1601 | void suspend_other_sg(struct drbd_device *device)
|
| 1602 | {
|
| 1603 | lock_all_resources();
|
| 1604 | drbd_pause_after(device);
|
| 1605 | unlock_all_resources();
|
| 1606 | }
|
| 1607 |
|
| 1608 |
|
| 1609 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor)
|
| 1610 | {
|
| 1611 | struct drbd_device *odev;
|
| 1612 | int resync_after;
|
| 1613 |
|
| 1614 | if (o_minor == -1)
|
| 1615 | return NO_ERROR;
|
| 1616 | if (o_minor < -1 || o_minor > MINORMASK)
|
| 1617 | return ERR_RESYNC_AFTER;
|
| 1618 |
|
| 1619 |
|
| 1620 | odev = minor_to_device(o_minor);
|
| 1621 | while (1) {
|
| 1622 | if (odev == device)
|
| 1623 | return ERR_RESYNC_AFTER_CYCLE;
|
| 1624 |
|
| 1625 | |
| 1626 | * or not yet/no longer existing minors.
|
| 1627 | * We only reject dependency loops.
|
| 1628 | * We cannot follow the dependency chain beyond a detached or
|
| 1629 | * missing minor.
|
| 1630 |
|
| 1631 | if (!odev || !odev->ldev || odev->state.disk == D_DISKLESS)
|
| 1632 | return NO_ERROR;
|
| 1633 |
|
| 1634 | rcu_read_lock();
|
| 1635 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after;
|
| 1636 | rcu_read_unlock();
|
| 1637 |
|
| 1638 | if (resync_after == -1)
|
| 1639 | return NO_ERROR;
|
| 1640 |
|
| 1641 |
|
| 1642 | odev = minor_to_device(resync_after);
|
| 1643 | }
|
| 1644 | }
|
| 1645 |
|
| 1646 |
|
| 1647 | void drbd_resync_after_changed(struct drbd_device *device)
|
| 1648 | {
|
| 1649 | int changed;
|
| 1650 |
|
| 1651 | do {
|
| 1652 | changed = drbd_pause_after(device);
|
| 1653 | changed |= drbd_resume_next(device);
|
| 1654 | } while (changed);
|
| 1655 | }
|
| 1656 |
|
| 1657 | void drbd_rs_controller_reset(struct drbd_peer_device *peer_device)
|
| 1658 | {
|
| 1659 | struct drbd_device *device = peer_device->device;
|
| 1660 | struct gendisk *disk = device->ldev->backing_bdev->bd_disk;
|
| 1661 | struct fifo_buffer *plan;
|
| 1662 |
|
| 1663 | atomic_set(&device->rs_sect_in, 0);
|
| 1664 | atomic_set(&device->rs_sect_ev, 0);
|
| 1665 | device->rs_in_flight = 0;
|
| 1666 | device->rs_last_events =
|
| 1667 | (int)part_stat_read_accum(disk->part0, sectors);
|
| 1668 |
|
| 1669 | |
| 1670 | this function gets called from atomic context.
|
| 1671 | It is valid since all other updates also lead to an completely
|
| 1672 | empty fifo
|
| 1673 | rcu_read_lock();
|
| 1674 | plan = rcu_dereference(device->rs_plan_s);
|
| 1675 | plan->total = 0;
|
| 1676 | fifo_set(plan, 0);
|
| 1677 | rcu_read_unlock();
|
| 1678 | }
|
| 1679 |
|
| 1680 | void start_resync_timer_fn(struct timer_list *t)
|
| 1681 | {
|
| 1682 | struct drbd_device *device = timer_container_of(device, t,
|
| 1683 | start_resync_timer);
|
| 1684 | drbd_device_post_work(device, RS_START);
|
| 1685 | }
|
| 1686 |
|
| 1687 | static void do_start_resync(struct drbd_device *device)
|
| 1688 | {
|
| 1689 | if (atomic_read(&device->unacked_cnt) || atomic_read(&device->rs_pending_cnt)) {
|
| 1690 | drbd_warn(device, "postponing start_resync ...\n");
|
| 1691 | device->start_resync_timer.expires = jiffies + HZ/10;
|
| 1692 | add_timer(&device->start_resync_timer);
|
| 1693 | return;
|
| 1694 | }
|
| 1695 |
|
| 1696 | drbd_start_resync(device, C_SYNC_SOURCE);
|
| 1697 | clear_bit(AHEAD_TO_SYNC_SOURCE, &device->flags);
|
| 1698 | }
|
| 1699 |
|
| 1700 | static bool use_checksum_based_resync(struct drbd_connection *connection, struct drbd_device *device)
|
| 1701 | {
|
| 1702 | bool csums_after_crash_only;
|
| 1703 | rcu_read_lock();
|
| 1704 | csums_after_crash_only = rcu_dereference(connection->net_conf)->csums_after_crash_only;
|
| 1705 | rcu_read_unlock();
|
| 1706 | return connection->agreed_pro_version >= 89 &&
|
| 1707 | connection->csums_tfm &&
|
| 1708 | (csums_after_crash_only == false
|
| 1709 | || test_bit(CRASHED_PRIMARY, &device->flags));
|
| 1710 | }
|
| 1711 |
|
| 1712 | |
| 1713 | * drbd_start_resync() - Start the resync process
|
| 1714 | * @device: DRBD device.
|
| 1715 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET
|
| 1716 | *
|
| 1717 | * This function might bring you directly into one of the
|
| 1718 | * C_PAUSED_SYNC_* states.
|
| 1719 |
|
| 1720 | void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
|
| 1721 | {
|
| 1722 | struct drbd_peer_device *peer_device = first_peer_device(device);
|
| 1723 | struct drbd_connection *connection = peer_device ? peer_device->connection : NULL;
|
| 1724 | union drbd_state ns;
|
| 1725 | int r;
|
| 1726 |
|
| 1727 | if (device->state.conn >= C_SYNC_SOURCE && device->state.conn < C_AHEAD) {
|
| 1728 | drbd_err(device, "Resync already running!\n");
|
| 1729 | return;
|
| 1730 | }
|
| 1731 |
|
| 1732 | if (!connection) {
|
| 1733 | drbd_err(device, "No connection to peer, aborting!\n");
|
| 1734 | return;
|
| 1735 | }
|
| 1736 |
|
| 1737 | if (!test_bit(B_RS_H_DONE, &device->flags)) {
|
| 1738 | if (side == C_SYNC_TARGET) {
|
| 1739 | |
| 1740 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET
|
| 1741 | we check that we might make the data inconsistent.
|
| 1742 | r = drbd_khelper(device, "before-resync-target");
|
| 1743 | r = (r >> 8) & 0xff;
|
| 1744 | if (r > 0) {
|
| 1745 | drbd_info(device, "before-resync-target handler returned %d, "
|
| 1746 | "dropping connection.\n", r);
|
| 1747 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
|
| 1748 | return;
|
| 1749 | }
|
| 1750 | } else {
|
| 1751 | r = drbd_khelper(device, "before-resync-source");
|
| 1752 | r = (r >> 8) & 0xff;
|
| 1753 | if (r > 0) {
|
| 1754 | if (r == 3) {
|
| 1755 | drbd_info(device, "before-resync-source handler returned %d, "
|
| 1756 | "ignoring. Old userland tools?", r);
|
| 1757 | } else {
|
| 1758 | drbd_info(device, "before-resync-source handler returned %d, "
|
| 1759 | "dropping connection.\n", r);
|
| 1760 | conn_request_state(connection,
|
| 1761 | NS(conn, C_DISCONNECTING), CS_HARD);
|
| 1762 | return;
|
| 1763 | }
|
| 1764 | }
|
| 1765 | }
|
| 1766 | }
|
| 1767 |
|
| 1768 | if (current == connection->worker.task) {
|
| 1769 | |
| 1770 | that can take long
|
| 1771 | if (!mutex_trylock(device->state_mutex)) {
|
| 1772 | set_bit(B_RS_H_DONE, &device->flags);
|
| 1773 | device->start_resync_timer.expires = jiffies + HZ/5;
|
| 1774 | add_timer(&device->start_resync_timer);
|
| 1775 | return;
|
| 1776 | }
|
| 1777 | } else {
|
| 1778 | mutex_lock(device->state_mutex);
|
| 1779 | }
|
| 1780 |
|
| 1781 | lock_all_resources();
|
| 1782 | clear_bit(B_RS_H_DONE, &device->flags);
|
| 1783 |
|
| 1784 | if (device->state.conn < C_CONNECTED
|
| 1785 | || !get_ldev_if_state(device, D_NEGOTIATING)) {
|
| 1786 | unlock_all_resources();
|
| 1787 | goto out;
|
| 1788 | }
|
| 1789 |
|
| 1790 | ns = drbd_read_state(device);
|
| 1791 |
|
| 1792 | ns.aftr_isp = !_drbd_may_sync_now(device);
|
| 1793 |
|
| 1794 | ns.conn = side;
|
| 1795 |
|
| 1796 | if (side == C_SYNC_TARGET)
|
| 1797 | ns.disk = D_INCONSISTENT;
|
| 1798 | else
|
| 1799 | ns.pdsk = D_INCONSISTENT;
|
| 1800 |
|
| 1801 | r = _drbd_set_state(device, ns, CS_VERBOSE, NULL);
|
| 1802 | ns = drbd_read_state(device);
|
| 1803 |
|
| 1804 | if (ns.conn < C_CONNECTED)
|
| 1805 | r = SS_UNKNOWN_ERROR;
|
| 1806 |
|
| 1807 | if (r == SS_SUCCESS) {
|
| 1808 | unsigned long tw = drbd_bm_total_weight(device);
|
| 1809 | unsigned long now = jiffies;
|
| 1810 | int i;
|
| 1811 |
|
| 1812 | device->rs_failed = 0;
|
| 1813 | device->rs_paused = 0;
|
| 1814 | device->rs_same_csum = 0;
|
| 1815 | device->rs_last_sect_ev = 0;
|
| 1816 | device->rs_total = tw;
|
| 1817 | device->rs_start = now;
|
| 1818 | for (i = 0; i < DRBD_SYNC_MARKS; i++) {
|
| 1819 | device->rs_mark_left[i] = tw;
|
| 1820 | device->rs_mark_time[i] = now;
|
| 1821 | }
|
| 1822 | drbd_pause_after(device);
|
| 1823 | |
| 1824 | * Open coded drbd_rs_cancel_all(device), we already have IRQs
|
| 1825 | * disabled, and know the disk state is ok.
|
| 1826 | spin_lock(&device->al_lock);
|
| 1827 | lc_reset(device->resync);
|
| 1828 | device->resync_locked = 0;
|
| 1829 | device->resync_wenr = LC_FREE;
|
| 1830 | spin_unlock(&device->al_lock);
|
| 1831 | }
|
| 1832 | unlock_all_resources();
|
| 1833 |
|
| 1834 | if (r == SS_SUCCESS) {
|
| 1835 | wake_up(&device->al_wait);
|
| 1836 | |
| 1837 | * to deal with potential jiffies wrap.
|
| 1838 | device->rs_last_bcast = jiffies - HZ;
|
| 1839 |
|
| 1840 | drbd_info(device, "Began resync as %s (will sync %lu KB [%lu bits set]).\n",
|
| 1841 | drbd_conn_str(ns.conn),
|
| 1842 | (unsigned long) device->rs_total << (BM_BLOCK_SHIFT-10),
|
| 1843 | (unsigned long) device->rs_total);
|
| 1844 | if (side == C_SYNC_TARGET) {
|
| 1845 | device->bm_resync_fo = 0;
|
| 1846 | device->use_csums = use_checksum_based_resync(connection, device);
|
| 1847 | } else {
|
| 1848 | device->use_csums = false;
|
| 1849 | }
|
| 1850 |
|
| 1851 | |
| 1852 | * with w_send_oos, or the sync target will get confused as to
|
| 1853 | * how much bits to resync. We cannot do that always, because for an
|
| 1854 | * empty resync and protocol < 95, we need to do it here, as we call
|
| 1855 | * drbd_resync_finished from here in that case.
|
| 1856 | * We drbd_gen_and_send_sync_uuid here for protocol < 96,
|
| 1857 | * and from after_state_ch otherwise.
|
| 1858 | if (side == C_SYNC_SOURCE && connection->agreed_pro_version < 96)
|
| 1859 | drbd_gen_and_send_sync_uuid(peer_device);
|
| 1860 |
|
| 1861 | if (connection->agreed_pro_version < 95 && device->rs_total == 0) {
|
| 1862 | |
| 1863 | * detect connection loss) that can lead to a full sync
|
| 1864 | * on next handshake. In 8.3.9 we fixed this with explicit
|
| 1865 | * resync-finished notifications, but the fix
|
| 1866 | * introduces a protocol change. Sleeping for some
|
| 1867 | * time longer than the ping interval + timeout on the
|
| 1868 | * SyncSource, to give the SyncTarget the chance to
|
| 1869 | * detect connection loss, then waiting for a ping
|
| 1870 | * response (implicit in drbd_resync_finished) reduces
|
| 1871 | * the race considerably, but does not solve it.
|
| 1872 | if (side == C_SYNC_SOURCE) {
|
| 1873 | struct net_conf *nc;
|
| 1874 | int timeo;
|
| 1875 |
|
| 1876 | rcu_read_lock();
|
| 1877 | nc = rcu_dereference(connection->net_conf);
|
| 1878 | timeo = nc->ping_int * HZ + nc->ping_timeo * HZ / 9;
|
| 1879 | rcu_read_unlock();
|
| 1880 | schedule_timeout_interruptible(timeo);
|
| 1881 | }
|
| 1882 | drbd_resync_finished(peer_device);
|
| 1883 | }
|
| 1884 |
|
| 1885 | drbd_rs_controller_reset(peer_device);
|
| 1886 | |
| 1887 | * we may have been paused in between, or become paused until
|
| 1888 | * the timer triggers.
|
| 1889 | * No matter, that is handled in resync_timer_fn()
|
| 1890 | if (ns.conn == C_SYNC_TARGET)
|
| 1891 | mod_timer(&device->resync_timer, jiffies);
|
| 1892 |
|
| 1893 | drbd_md_sync(device);
|
| 1894 | }
|
| 1895 | put_ldev(device);
|
| 1896 | out:
|
| 1897 | mutex_unlock(device->state_mutex);
|
| 1898 | }
|
| 1899 |
|
| 1900 | static void update_on_disk_bitmap(struct drbd_peer_device *peer_device, bool resync_done)
|
| 1901 | {
|
| 1902 | struct drbd_device *device = peer_device->device;
|
| 1903 | struct sib_info sib = { .sib_reason = SIB_SYNC_PROGRESS, };
|
| 1904 | device->rs_last_bcast = jiffies;
|
| 1905 |
|
| 1906 | if (!get_ldev(device))
|
| 1907 | return;
|
| 1908 |
|
| 1909 | drbd_bm_write_lazy(device, 0);
|
| 1910 | if (resync_done && is_sync_state(device->state.conn))
|
| 1911 | drbd_resync_finished(peer_device);
|
| 1912 |
|
| 1913 | drbd_bcast_event(device, &sib);
|
| 1914 |
|
| 1915 | device->rs_last_bcast = jiffies;
|
| 1916 | put_ldev(device);
|
| 1917 | }
|
| 1918 |
|
| 1919 | static void drbd_ldev_destroy(struct drbd_device *device)
|
| 1920 | {
|
| 1921 | lc_destroy(device->resync);
|
| 1922 | device->resync = NULL;
|
| 1923 | lc_destroy(device->act_log);
|
| 1924 | device->act_log = NULL;
|
| 1925 |
|
| 1926 | __acquire(local);
|
| 1927 | drbd_backing_dev_free(device, device->ldev);
|
| 1928 | device->ldev = NULL;
|
| 1929 | __release(local);
|
| 1930 |
|
| 1931 | clear_bit(GOING_DISKLESS, &device->flags);
|
| 1932 | wake_up(&device->misc_wait);
|
| 1933 | }
|
| 1934 |
|
| 1935 | static void go_diskless(struct drbd_device *device)
|
| 1936 | {
|
| 1937 | struct drbd_peer_device *peer_device = first_peer_device(device);
|
| 1938 | D_ASSERT(device, device->state.disk == D_FAILED);
|
| 1939 | |
| 1940 | * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
|
| 1941 | * the protected members anymore, though, so once put_ldev reaches zero
|
| 1942 | * again, it will be safe to free them.
|
| 1943 |
|
| 1944 | |
| 1945 | * set some bits outside the area covered by the activity log.
|
| 1946 | *
|
| 1947 | * If we have an IO error during the bitmap writeout,
|
| 1948 | * we will want a full sync next time, just in case.
|
| 1949 | * (Do we want a specific meta data flag for this?)
|
| 1950 | *
|
| 1951 | * If that does not make it to stable storage either,
|
| 1952 | * we cannot do anything about that anymore.
|
| 1953 | *
|
| 1954 | * We still need to check if both bitmap and ldev are present, we may
|
| 1955 | * end up here after a failed attach, before ldev was even assigned.
|
| 1956 |
|
| 1957 | if (device->bitmap && device->ldev) {
|
| 1958 | |
| 1959 | * while we detach.
|
| 1960 | * Any modifications would not be expected anymore, though.
|
| 1961 |
|
| 1962 | if (drbd_bitmap_io_from_worker(device, drbd_bm_write,
|
| 1963 | "detach", BM_LOCKED_TEST_ALLOWED, peer_device)) {
|
| 1964 | if (test_bit(WAS_READ_ERROR, &device->flags)) {
|
| 1965 | drbd_md_set_flag(device, MDF_FULL_SYNC);
|
| 1966 | drbd_md_sync(device);
|
| 1967 | }
|
| 1968 | }
|
| 1969 | }
|
| 1970 |
|
| 1971 | drbd_force_state(device, NS(disk, D_DISKLESS));
|
| 1972 | }
|
| 1973 |
|
| 1974 | static int do_md_sync(struct drbd_device *device)
|
| 1975 | {
|
| 1976 | drbd_warn(device, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
|
| 1977 | drbd_md_sync(device);
|
| 1978 | return 0;
|
| 1979 | }
|
| 1980 |
|
| 1981 |
|
| 1982 | void __update_timing_details(
|
| 1983 | struct drbd_thread_timing_details *tdp,
|
| 1984 | unsigned int *cb_nr,
|
| 1985 | void *cb,
|
| 1986 | const char *fn, const unsigned int line)
|
| 1987 | {
|
| 1988 | unsigned int i = *cb_nr % DRBD_THREAD_DETAILS_HIST;
|
| 1989 | struct drbd_thread_timing_details *td = tdp + i;
|
| 1990 |
|
| 1991 | td->start_jif = jiffies;
|
| 1992 | td->cb_addr = cb;
|
| 1993 | td->caller_fn = fn;
|
| 1994 | td->line = line;
|
| 1995 | td->cb_nr = *cb_nr;
|
| 1996 |
|
| 1997 | i = (i+1) % DRBD_THREAD_DETAILS_HIST;
|
| 1998 | td = tdp + i;
|
| 1999 | memset(td, 0, sizeof(*td));
|
| 2000 |
|
| 2001 | ++(*cb_nr);
|
| 2002 | }
|
| 2003 |
|
| 2004 | static void do_device_work(struct drbd_device *device, const unsigned long todo)
|
| 2005 | {
|
| 2006 | if (test_bit(MD_SYNC, &todo))
|
| 2007 | do_md_sync(device);
|
| 2008 | if (test_bit(RS_DONE, &todo) ||
|
| 2009 | test_bit(RS_PROGRESS, &todo))
|
| 2010 | update_on_disk_bitmap(first_peer_device(device), test_bit(RS_DONE, &todo));
|
| 2011 | if (test_bit(GO_DISKLESS, &todo))
|
| 2012 | go_diskless(device);
|
| 2013 | if (test_bit(DESTROY_DISK, &todo))
|
| 2014 | drbd_ldev_destroy(device);
|
| 2015 | if (test_bit(RS_START, &todo))
|
| 2016 | do_start_resync(device);
|
| 2017 | }
|
| 2018 |
|
| 2019 | #define DRBD_DEVICE_WORK_MASK \
|
| 2020 | ((1UL << GO_DISKLESS) \
|
| 2021 | |(1UL << DESTROY_DISK) \
|
| 2022 | |(1UL << MD_SYNC) \
|
| 2023 | |(1UL << RS_START) \
|
| 2024 | |(1UL << RS_PROGRESS) \
|
| 2025 | |(1UL << RS_DONE) \
|
| 2026 | )
|
| 2027 |
|
| 2028 | static unsigned long get_work_bits(unsigned long *flags)
|
| 2029 | {
|
| 2030 | unsigned long old, new;
|
| 2031 | do {
|
| 2032 | old = *flags;
|
| 2033 | new = old & ~DRBD_DEVICE_WORK_MASK;
|
| 2034 | } while (cmpxchg(flags, old, new) != old);
|
| 2035 | return old & DRBD_DEVICE_WORK_MASK;
|
| 2036 | }
|
| 2037 |
|
| 2038 | static void do_unqueued_work(struct drbd_connection *connection)
|
| 2039 | {
|
| 2040 | struct drbd_peer_device *peer_device;
|
| 2041 | int vnr;
|
| 2042 |
|
| 2043 | rcu_read_lock();
|
| 2044 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
|
| 2045 | struct drbd_device *device = peer_device->device;
|
| 2046 | unsigned long todo = get_work_bits(&device->flags);
|
| 2047 | if (!todo)
|
| 2048 | continue;
|
| 2049 |
|
| 2050 | kref_get(&device->kref);
|
| 2051 | rcu_read_unlock();
|
| 2052 | do_device_work(device, todo);
|
| 2053 | kref_put(&device->kref, drbd_destroy_device);
|
| 2054 | rcu_read_lock();
|
| 2055 | }
|
| 2056 | rcu_read_unlock();
|
| 2057 | }
|
| 2058 |
|
| 2059 | static bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *work_list)
|
| 2060 | {
|
| 2061 | spin_lock_irq(&queue->q_lock);
|
| 2062 | list_splice_tail_init(&queue->q, work_list);
|
| 2063 | spin_unlock_irq(&queue->q_lock);
|
| 2064 | return !list_empty(work_list);
|
| 2065 | }
|
| 2066 |
|
| 2067 | static void wait_for_work(struct drbd_connection *connection, struct list_head *work_list)
|
| 2068 | {
|
| 2069 | DEFINE_WAIT(wait);
|
| 2070 | struct net_conf *nc;
|
| 2071 | int uncork, cork;
|
| 2072 |
|
| 2073 | dequeue_work_batch(&connection->sender_work, work_list);
|
| 2074 | if (!list_empty(work_list))
|
| 2075 | return;
|
| 2076 |
|
| 2077 | |
| 2078 | * Maybe we still need to close the current epoch,
|
| 2079 | * even if no new requests are queued yet.
|
| 2080 | *
|
| 2081 | * Also, poke TCP, just in case.
|
| 2082 | * Then wait for new work (or signal).
|
| 2083 | rcu_read_lock();
|
| 2084 | nc = rcu_dereference(connection->net_conf);
|
| 2085 | uncork = nc ? nc->tcp_cork : 0;
|
| 2086 | rcu_read_unlock();
|
| 2087 | if (uncork) {
|
| 2088 | mutex_lock(&connection->data.mutex);
|
| 2089 | if (connection->data.socket)
|
| 2090 | tcp_sock_set_cork(connection->data.socket->sk, false);
|
| 2091 | mutex_unlock(&connection->data.mutex);
|
| 2092 | }
|
| 2093 |
|
| 2094 | for (;;) {
|
| 2095 | int send_barrier;
|
| 2096 | prepare_to_wait(&connection->sender_work.q_wait, &wait, TASK_INTERRUPTIBLE);
|
| 2097 | spin_lock_irq(&connection->resource->req_lock);
|
| 2098 | spin_lock(&connection->sender_work.q_lock);
|
| 2099 | if (!list_empty(&connection->sender_work.q))
|
| 2100 | list_splice_tail_init(&connection->sender_work.q, work_list);
|
| 2101 | spin_unlock(&connection->sender_work.q_lock);
|
| 2102 | if (!list_empty(work_list) || signal_pending(current)) {
|
| 2103 | spin_unlock_irq(&connection->resource->req_lock);
|
| 2104 | break;
|
| 2105 | }
|
| 2106 |
|
| 2107 | |
| 2108 | * no other work item. We may still need to close the last
|
| 2109 | * epoch. Next incoming request epoch will be connection ->
|
| 2110 | * current transfer log epoch number. If that is different
|
| 2111 | * from the epoch of the last request we communicated, it is
|
| 2112 | * safe to send the epoch separating barrier now.
|
| 2113 |
|
| 2114 | send_barrier =
|
| 2115 | atomic_read(&connection->current_tle_nr) !=
|
| 2116 | connection->send.current_epoch_nr;
|
| 2117 | spin_unlock_irq(&connection->resource->req_lock);
|
| 2118 |
|
| 2119 | if (send_barrier)
|
| 2120 | maybe_send_barrier(connection,
|
| 2121 | connection->send.current_epoch_nr + 1);
|
| 2122 |
|
| 2123 | if (test_bit(DEVICE_WORK_PENDING, &connection->flags))
|
| 2124 | break;
|
| 2125 |
|
| 2126 |
|
| 2127 | if (get_t_state(&connection->worker) != RUNNING)
|
| 2128 | break;
|
| 2129 |
|
| 2130 | schedule();
|
| 2131 | |
| 2132 | * e.g. if the current epoch got closed.
|
| 2133 | * In which case we send the barrier above.
|
| 2134 | }
|
| 2135 | finish_wait(&connection->sender_work.q_wait, &wait);
|
| 2136 |
|
| 2137 |
|
| 2138 | rcu_read_lock();
|
| 2139 | nc = rcu_dereference(connection->net_conf);
|
| 2140 | cork = nc ? nc->tcp_cork : 0;
|
| 2141 | rcu_read_unlock();
|
| 2142 | mutex_lock(&connection->data.mutex);
|
| 2143 | if (connection->data.socket) {
|
| 2144 | if (cork)
|
| 2145 | tcp_sock_set_cork(connection->data.socket->sk, true);
|
| 2146 | else if (!uncork)
|
| 2147 | tcp_sock_set_cork(connection->data.socket->sk, false);
|
| 2148 | }
|
| 2149 | mutex_unlock(&connection->data.mutex);
|
| 2150 | }
|
| 2151 |
|
| 2152 | int drbd_worker(struct drbd_thread *thi)
|
| 2153 | {
|
| 2154 | struct drbd_connection *connection = thi->connection;
|
| 2155 | struct drbd_work *w = NULL;
|
| 2156 | struct drbd_peer_device *peer_device;
|
| 2157 | LIST_HEAD(work_list);
|
| 2158 | int vnr;
|
| 2159 |
|
| 2160 | while (get_t_state(thi) == RUNNING) {
|
| 2161 | drbd_thread_current_set_cpu(thi);
|
| 2162 |
|
| 2163 | if (list_empty(&work_list)) {
|
| 2164 | update_worker_timing_details(connection, wait_for_work);
|
| 2165 | wait_for_work(connection, &work_list);
|
| 2166 | }
|
| 2167 |
|
| 2168 | if (test_and_clear_bit(DEVICE_WORK_PENDING, &connection->flags)) {
|
| 2169 | update_worker_timing_details(connection, do_unqueued_work);
|
| 2170 | do_unqueued_work(connection);
|
| 2171 | }
|
| 2172 |
|
| 2173 | if (signal_pending(current)) {
|
| 2174 | flush_signals(current);
|
| 2175 | if (get_t_state(thi) == RUNNING) {
|
| 2176 | drbd_warn(connection, "Worker got an unexpected signal\n");
|
| 2177 | continue;
|
| 2178 | }
|
| 2179 | break;
|
| 2180 | }
|
| 2181 |
|
| 2182 | if (get_t_state(thi) != RUNNING)
|
| 2183 | break;
|
| 2184 |
|
| 2185 | if (!list_empty(&work_list)) {
|
| 2186 | w = list_first_entry(&work_list, struct drbd_work, list);
|
| 2187 | list_del_init(&w->list);
|
| 2188 | update_worker_timing_details(connection, w->cb);
|
| 2189 | if (w->cb(w, connection->cstate < C_WF_REPORT_PARAMS) == 0)
|
| 2190 | continue;
|
| 2191 | if (connection->cstate >= C_WF_REPORT_PARAMS)
|
| 2192 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD);
|
| 2193 | }
|
| 2194 | }
|
| 2195 |
|
| 2196 | do {
|
| 2197 | if (test_and_clear_bit(DEVICE_WORK_PENDING, &connection->flags)) {
|
| 2198 | update_worker_timing_details(connection, do_unqueued_work);
|
| 2199 | do_unqueued_work(connection);
|
| 2200 | }
|
| 2201 | if (!list_empty(&work_list)) {
|
| 2202 | w = list_first_entry(&work_list, struct drbd_work, list);
|
| 2203 | list_del_init(&w->list);
|
| 2204 | update_worker_timing_details(connection, w->cb);
|
| 2205 | w->cb(w, 1);
|
| 2206 | } else
|
| 2207 | dequeue_work_batch(&connection->sender_work, &work_list);
|
| 2208 | } while (!list_empty(&work_list) || test_bit(DEVICE_WORK_PENDING, &connection->flags));
|
| 2209 |
|
| 2210 | rcu_read_lock();
|
| 2211 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
|
| 2212 | struct drbd_device *device = peer_device->device;
|
| 2213 | D_ASSERT(device, device->state.disk == D_DISKLESS && device->state.conn == C_STANDALONE);
|
| 2214 | kref_get(&device->kref);
|
| 2215 | rcu_read_unlock();
|
| 2216 | drbd_device_cleanup(device);
|
| 2217 | kref_put(&device->kref, drbd_destroy_device);
|
| 2218 | rcu_read_lock();
|
| 2219 | }
|
| 2220 | rcu_read_unlock();
|
| 2221 |
|
| 2222 | return 0;
|
| 2223 | }
|