1b411b363SPhilipp Reisner /* 2b411b363SPhilipp Reisner drbd_worker.c 3b411b363SPhilipp Reisner 4b411b363SPhilipp Reisner This file is part of DRBD by Philipp Reisner and Lars Ellenberg. 5b411b363SPhilipp Reisner 6b411b363SPhilipp Reisner Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. 7b411b363SPhilipp Reisner Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. 8b411b363SPhilipp Reisner Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. 9b411b363SPhilipp Reisner 10b411b363SPhilipp Reisner drbd is free software; you can redistribute it and/or modify 11b411b363SPhilipp Reisner it under the terms of the GNU General Public License as published by 12b411b363SPhilipp Reisner the Free Software Foundation; either version 2, or (at your option) 13b411b363SPhilipp Reisner any later version. 14b411b363SPhilipp Reisner 15b411b363SPhilipp Reisner drbd is distributed in the hope that it will be useful, 16b411b363SPhilipp Reisner but WITHOUT ANY WARRANTY; without even the implied warranty of 17b411b363SPhilipp Reisner MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18b411b363SPhilipp Reisner GNU General Public License for more details. 19b411b363SPhilipp Reisner 20b411b363SPhilipp Reisner You should have received a copy of the GNU General Public License 21b411b363SPhilipp Reisner along with drbd; see the file COPYING. If not, write to 22b411b363SPhilipp Reisner the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 23b411b363SPhilipp Reisner 24b411b363SPhilipp Reisner */ 25b411b363SPhilipp Reisner 26b411b363SPhilipp Reisner #include <linux/module.h> 27b411b363SPhilipp Reisner #include <linux/drbd.h> 28b411b363SPhilipp Reisner #include <linux/sched.h> 29b411b363SPhilipp Reisner #include <linux/smp_lock.h> 30b411b363SPhilipp Reisner #include <linux/wait.h> 31b411b363SPhilipp Reisner #include <linux/mm.h> 32b411b363SPhilipp Reisner #include <linux/memcontrol.h> 33b411b363SPhilipp Reisner #include <linux/mm_inline.h> 34b411b363SPhilipp Reisner #include <linux/slab.h> 35b411b363SPhilipp Reisner #include <linux/random.h> 36b411b363SPhilipp Reisner #include <linux/string.h> 37b411b363SPhilipp Reisner #include <linux/scatterlist.h> 38b411b363SPhilipp Reisner 39b411b363SPhilipp Reisner #include "drbd_int.h" 40b411b363SPhilipp Reisner #include "drbd_req.h" 41b411b363SPhilipp Reisner 42b411b363SPhilipp Reisner static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel); 43b411b363SPhilipp Reisner 44b411b363SPhilipp Reisner 45b411b363SPhilipp Reisner 46b411b363SPhilipp Reisner /* defined here: 47b411b363SPhilipp Reisner drbd_md_io_complete 4845bb912bSLars Ellenberg drbd_endio_sec 49b411b363SPhilipp Reisner drbd_endio_pri 50b411b363SPhilipp Reisner 51b411b363SPhilipp Reisner * more endio handlers: 52b411b363SPhilipp Reisner atodb_endio in drbd_actlog.c 53b411b363SPhilipp Reisner drbd_bm_async_io_complete in drbd_bitmap.c 54b411b363SPhilipp Reisner 55b411b363SPhilipp Reisner * For all these callbacks, note the following: 56b411b363SPhilipp Reisner * The callbacks will be called in irq context by the IDE drivers, 57b411b363SPhilipp Reisner * and in Softirqs/Tasklets/BH context by the SCSI drivers. 58b411b363SPhilipp Reisner * Try to get the locking right :) 59b411b363SPhilipp Reisner * 60b411b363SPhilipp Reisner */ 61b411b363SPhilipp Reisner 62b411b363SPhilipp Reisner 63b411b363SPhilipp Reisner /* About the global_state_lock 64b411b363SPhilipp Reisner Each state transition on an device holds a read lock. In case we have 65b411b363SPhilipp Reisner to evaluate the sync after dependencies, we grab a write lock, because 66b411b363SPhilipp Reisner we need stable states on all devices for that. */ 67b411b363SPhilipp Reisner rwlock_t global_state_lock; 68b411b363SPhilipp Reisner 69b411b363SPhilipp Reisner /* used for synchronous meta data and bitmap IO 70b411b363SPhilipp Reisner * submitted by drbd_md_sync_page_io() 71b411b363SPhilipp Reisner */ 72b411b363SPhilipp Reisner void drbd_md_io_complete(struct bio *bio, int error) 73b411b363SPhilipp Reisner { 74b411b363SPhilipp Reisner struct drbd_md_io *md_io; 75b411b363SPhilipp Reisner 76b411b363SPhilipp Reisner md_io = (struct drbd_md_io *)bio->bi_private; 77b411b363SPhilipp Reisner md_io->error = error; 78b411b363SPhilipp Reisner 79b411b363SPhilipp Reisner complete(&md_io->event); 80b411b363SPhilipp Reisner } 81b411b363SPhilipp Reisner 82b411b363SPhilipp Reisner /* reads on behalf of the partner, 83b411b363SPhilipp Reisner * "submitted" by the receiver 84b411b363SPhilipp Reisner */ 8545bb912bSLars Ellenberg void drbd_endio_read_sec_final(struct drbd_epoch_entry *e) __releases(local) 86b411b363SPhilipp Reisner { 87b411b363SPhilipp Reisner unsigned long flags = 0; 8845bb912bSLars Ellenberg struct drbd_conf *mdev = e->mdev; 89b411b363SPhilipp Reisner 90b411b363SPhilipp Reisner D_ASSERT(e->block_id != ID_VACANT); 91b411b363SPhilipp Reisner 92b411b363SPhilipp Reisner spin_lock_irqsave(&mdev->req_lock, flags); 93b411b363SPhilipp Reisner mdev->read_cnt += e->size >> 9; 94b411b363SPhilipp Reisner list_del(&e->w.list); 95b411b363SPhilipp Reisner if (list_empty(&mdev->read_ee)) 96b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 9745bb912bSLars Ellenberg if (test_bit(__EE_WAS_ERROR, &e->flags)) 9845bb912bSLars Ellenberg __drbd_chk_io_error(mdev, FALSE); 99b411b363SPhilipp Reisner spin_unlock_irqrestore(&mdev->req_lock, flags); 100b411b363SPhilipp Reisner 101b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &e->w); 102b411b363SPhilipp Reisner put_ldev(mdev); 103b411b363SPhilipp Reisner } 104b411b363SPhilipp Reisner 10545bb912bSLars Ellenberg static int is_failed_barrier(int ee_flags) 10645bb912bSLars Ellenberg { 10745bb912bSLars Ellenberg return (ee_flags & (EE_IS_BARRIER|EE_WAS_ERROR|EE_RESUBMITTED)) 10845bb912bSLars Ellenberg == (EE_IS_BARRIER|EE_WAS_ERROR); 10945bb912bSLars Ellenberg } 11045bb912bSLars Ellenberg 111b411b363SPhilipp Reisner /* writes on behalf of the partner, or resync writes, 11245bb912bSLars Ellenberg * "submitted" by the receiver, final stage. */ 11345bb912bSLars Ellenberg static void drbd_endio_write_sec_final(struct drbd_epoch_entry *e) __releases(local) 114b411b363SPhilipp Reisner { 115b411b363SPhilipp Reisner unsigned long flags = 0; 11645bb912bSLars Ellenberg struct drbd_conf *mdev = e->mdev; 117b411b363SPhilipp Reisner sector_t e_sector; 118b411b363SPhilipp Reisner int do_wake; 119b411b363SPhilipp Reisner int is_syncer_req; 120b411b363SPhilipp Reisner int do_al_complete_io; 121b411b363SPhilipp Reisner 12245bb912bSLars Ellenberg /* if this is a failed barrier request, disable use of barriers, 12345bb912bSLars Ellenberg * and schedule for resubmission */ 12445bb912bSLars Ellenberg if (is_failed_barrier(e->flags)) { 125b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_bdev_flush); 126b411b363SPhilipp Reisner spin_lock_irqsave(&mdev->req_lock, flags); 127b411b363SPhilipp Reisner list_del(&e->w.list); 128fc8ce194SPhilipp Reisner e->flags = (e->flags & ~EE_WAS_ERROR) | EE_RESUBMITTED; 129b411b363SPhilipp Reisner e->w.cb = w_e_reissue; 130b411b363SPhilipp Reisner /* put_ldev actually happens below, once we come here again. */ 131b411b363SPhilipp Reisner __release(local); 132b411b363SPhilipp Reisner spin_unlock_irqrestore(&mdev->req_lock, flags); 133b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &e->w); 134b411b363SPhilipp Reisner return; 135b411b363SPhilipp Reisner } 136b411b363SPhilipp Reisner 137b411b363SPhilipp Reisner D_ASSERT(e->block_id != ID_VACANT); 138b411b363SPhilipp Reisner 139b411b363SPhilipp Reisner /* after we moved e to done_ee, 140b411b363SPhilipp Reisner * we may no longer access it, 141b411b363SPhilipp Reisner * it may be freed/reused already! 142b411b363SPhilipp Reisner * (as soon as we release the req_lock) */ 143b411b363SPhilipp Reisner e_sector = e->sector; 144b411b363SPhilipp Reisner do_al_complete_io = e->flags & EE_CALL_AL_COMPLETE_IO; 14545bb912bSLars Ellenberg is_syncer_req = is_syncer_block_id(e->block_id); 146b411b363SPhilipp Reisner 14745bb912bSLars Ellenberg spin_lock_irqsave(&mdev->req_lock, flags); 14845bb912bSLars Ellenberg mdev->writ_cnt += e->size >> 9; 149b411b363SPhilipp Reisner list_del(&e->w.list); /* has been on active_ee or sync_ee */ 150b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 151b411b363SPhilipp Reisner 152b411b363SPhilipp Reisner /* No hlist_del_init(&e->colision) here, we did not send the Ack yet, 153b411b363SPhilipp Reisner * neither did we wake possibly waiting conflicting requests. 154b411b363SPhilipp Reisner * done from "drbd_process_done_ee" within the appropriate w.cb 155b411b363SPhilipp Reisner * (e_end_block/e_end_resync_block) or from _drbd_clear_done_ee */ 156b411b363SPhilipp Reisner 157b411b363SPhilipp Reisner do_wake = is_syncer_req 158b411b363SPhilipp Reisner ? list_empty(&mdev->sync_ee) 159b411b363SPhilipp Reisner : list_empty(&mdev->active_ee); 160b411b363SPhilipp Reisner 16145bb912bSLars Ellenberg if (test_bit(__EE_WAS_ERROR, &e->flags)) 162b411b363SPhilipp Reisner __drbd_chk_io_error(mdev, FALSE); 163b411b363SPhilipp Reisner spin_unlock_irqrestore(&mdev->req_lock, flags); 164b411b363SPhilipp Reisner 165b411b363SPhilipp Reisner if (is_syncer_req) 166b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, e_sector); 167b411b363SPhilipp Reisner 168b411b363SPhilipp Reisner if (do_wake) 169b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 170b411b363SPhilipp Reisner 171b411b363SPhilipp Reisner if (do_al_complete_io) 172b411b363SPhilipp Reisner drbd_al_complete_io(mdev, e_sector); 173b411b363SPhilipp Reisner 174b411b363SPhilipp Reisner wake_asender(mdev); 175b411b363SPhilipp Reisner put_ldev(mdev); 17645bb912bSLars Ellenberg } 177b411b363SPhilipp Reisner 17845bb912bSLars Ellenberg /* writes on behalf of the partner, or resync writes, 17945bb912bSLars Ellenberg * "submitted" by the receiver. 18045bb912bSLars Ellenberg */ 18145bb912bSLars Ellenberg void drbd_endio_sec(struct bio *bio, int error) 18245bb912bSLars Ellenberg { 18345bb912bSLars Ellenberg struct drbd_epoch_entry *e = bio->bi_private; 18445bb912bSLars Ellenberg struct drbd_conf *mdev = e->mdev; 18545bb912bSLars Ellenberg int uptodate = bio_flagged(bio, BIO_UPTODATE); 18645bb912bSLars Ellenberg int is_write = bio_data_dir(bio) == WRITE; 18745bb912bSLars Ellenberg 18845bb912bSLars Ellenberg if (error) 18945bb912bSLars Ellenberg dev_warn(DEV, "%s: error=%d s=%llus\n", 19045bb912bSLars Ellenberg is_write ? "write" : "read", error, 19145bb912bSLars Ellenberg (unsigned long long)e->sector); 19245bb912bSLars Ellenberg if (!error && !uptodate) { 19345bb912bSLars Ellenberg dev_warn(DEV, "%s: setting error to -EIO s=%llus\n", 19445bb912bSLars Ellenberg is_write ? "write" : "read", 19545bb912bSLars Ellenberg (unsigned long long)e->sector); 19645bb912bSLars Ellenberg /* strange behavior of some lower level drivers... 19745bb912bSLars Ellenberg * fail the request by clearing the uptodate flag, 19845bb912bSLars Ellenberg * but do not return any error?! */ 19945bb912bSLars Ellenberg error = -EIO; 20045bb912bSLars Ellenberg } 20145bb912bSLars Ellenberg 20245bb912bSLars Ellenberg if (error) 20345bb912bSLars Ellenberg set_bit(__EE_WAS_ERROR, &e->flags); 20445bb912bSLars Ellenberg 20545bb912bSLars Ellenberg bio_put(bio); /* no need for the bio anymore */ 20645bb912bSLars Ellenberg if (atomic_dec_and_test(&e->pending_bios)) { 20745bb912bSLars Ellenberg if (is_write) 20845bb912bSLars Ellenberg drbd_endio_write_sec_final(e); 20945bb912bSLars Ellenberg else 21045bb912bSLars Ellenberg drbd_endio_read_sec_final(e); 21145bb912bSLars Ellenberg } 212b411b363SPhilipp Reisner } 213b411b363SPhilipp Reisner 214b411b363SPhilipp Reisner /* read, readA or write requests on R_PRIMARY coming from drbd_make_request 215b411b363SPhilipp Reisner */ 216b411b363SPhilipp Reisner void drbd_endio_pri(struct bio *bio, int error) 217b411b363SPhilipp Reisner { 218b411b363SPhilipp Reisner unsigned long flags; 219b411b363SPhilipp Reisner struct drbd_request *req = bio->bi_private; 220b411b363SPhilipp Reisner struct drbd_conf *mdev = req->mdev; 221b411b363SPhilipp Reisner struct bio_and_error m; 222b411b363SPhilipp Reisner enum drbd_req_event what; 223b411b363SPhilipp Reisner int uptodate = bio_flagged(bio, BIO_UPTODATE); 224b411b363SPhilipp Reisner 225b411b363SPhilipp Reisner if (!error && !uptodate) { 226b411b363SPhilipp Reisner dev_warn(DEV, "p %s: setting error to -EIO\n", 227b411b363SPhilipp Reisner bio_data_dir(bio) == WRITE ? "write" : "read"); 228b411b363SPhilipp Reisner /* strange behavior of some lower level drivers... 229b411b363SPhilipp Reisner * fail the request by clearing the uptodate flag, 230b411b363SPhilipp Reisner * but do not return any error?! */ 231b411b363SPhilipp Reisner error = -EIO; 232b411b363SPhilipp Reisner } 233b411b363SPhilipp Reisner 234b411b363SPhilipp Reisner /* to avoid recursion in __req_mod */ 235b411b363SPhilipp Reisner if (unlikely(error)) { 236b411b363SPhilipp Reisner what = (bio_data_dir(bio) == WRITE) 237b411b363SPhilipp Reisner ? write_completed_with_error 2385c3c7e64SLars Ellenberg : (bio_rw(bio) == READ) 239b411b363SPhilipp Reisner ? read_completed_with_error 240b411b363SPhilipp Reisner : read_ahead_completed_with_error; 241b411b363SPhilipp Reisner } else 242b411b363SPhilipp Reisner what = completed_ok; 243b411b363SPhilipp Reisner 244b411b363SPhilipp Reisner bio_put(req->private_bio); 245b411b363SPhilipp Reisner req->private_bio = ERR_PTR(error); 246b411b363SPhilipp Reisner 247b411b363SPhilipp Reisner spin_lock_irqsave(&mdev->req_lock, flags); 248b411b363SPhilipp Reisner __req_mod(req, what, &m); 249b411b363SPhilipp Reisner spin_unlock_irqrestore(&mdev->req_lock, flags); 250b411b363SPhilipp Reisner 251b411b363SPhilipp Reisner if (m.bio) 252b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 253b411b363SPhilipp Reisner } 254b411b363SPhilipp Reisner 255b411b363SPhilipp Reisner int w_read_retry_remote(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 256b411b363SPhilipp Reisner { 257b411b363SPhilipp Reisner struct drbd_request *req = container_of(w, struct drbd_request, w); 258b411b363SPhilipp Reisner 259b411b363SPhilipp Reisner /* We should not detach for read io-error, 260b411b363SPhilipp Reisner * but try to WRITE the P_DATA_REPLY to the failed location, 261b411b363SPhilipp Reisner * to give the disk the chance to relocate that block */ 262b411b363SPhilipp Reisner 263b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 264d255e5ffSLars Ellenberg if (cancel || mdev->state.pdsk != D_UP_TO_DATE) { 265d255e5ffSLars Ellenberg _req_mod(req, read_retry_remote_canceled); 266b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 267b411b363SPhilipp Reisner return 1; 268b411b363SPhilipp Reisner } 269b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 270b411b363SPhilipp Reisner 271b411b363SPhilipp Reisner return w_send_read_req(mdev, w, 0); 272b411b363SPhilipp Reisner } 273b411b363SPhilipp Reisner 274b411b363SPhilipp Reisner int w_resync_inactive(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 275b411b363SPhilipp Reisner { 276b411b363SPhilipp Reisner ERR_IF(cancel) return 1; 277b411b363SPhilipp Reisner dev_err(DEV, "resync inactive, but callback triggered??\n"); 278b411b363SPhilipp Reisner return 1; /* Simply ignore this! */ 279b411b363SPhilipp Reisner } 280b411b363SPhilipp Reisner 28145bb912bSLars Ellenberg void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, struct drbd_epoch_entry *e, void *digest) 28245bb912bSLars Ellenberg { 28345bb912bSLars Ellenberg struct hash_desc desc; 28445bb912bSLars Ellenberg struct scatterlist sg; 28545bb912bSLars Ellenberg struct page *page = e->pages; 28645bb912bSLars Ellenberg struct page *tmp; 28745bb912bSLars Ellenberg unsigned len; 28845bb912bSLars Ellenberg 28945bb912bSLars Ellenberg desc.tfm = tfm; 29045bb912bSLars Ellenberg desc.flags = 0; 29145bb912bSLars Ellenberg 29245bb912bSLars Ellenberg sg_init_table(&sg, 1); 29345bb912bSLars Ellenberg crypto_hash_init(&desc); 29445bb912bSLars Ellenberg 29545bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) { 29645bb912bSLars Ellenberg /* all but the last page will be fully used */ 29745bb912bSLars Ellenberg sg_set_page(&sg, page, PAGE_SIZE, 0); 29845bb912bSLars Ellenberg crypto_hash_update(&desc, &sg, sg.length); 29945bb912bSLars Ellenberg page = tmp; 30045bb912bSLars Ellenberg } 30145bb912bSLars Ellenberg /* and now the last, possibly only partially used page */ 30245bb912bSLars Ellenberg len = e->size & (PAGE_SIZE - 1); 30345bb912bSLars Ellenberg sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); 30445bb912bSLars Ellenberg crypto_hash_update(&desc, &sg, sg.length); 30545bb912bSLars Ellenberg crypto_hash_final(&desc, digest); 30645bb912bSLars Ellenberg } 30745bb912bSLars Ellenberg 30845bb912bSLars Ellenberg void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) 309b411b363SPhilipp Reisner { 310b411b363SPhilipp Reisner struct hash_desc desc; 311b411b363SPhilipp Reisner struct scatterlist sg; 312b411b363SPhilipp Reisner struct bio_vec *bvec; 313b411b363SPhilipp Reisner int i; 314b411b363SPhilipp Reisner 315b411b363SPhilipp Reisner desc.tfm = tfm; 316b411b363SPhilipp Reisner desc.flags = 0; 317b411b363SPhilipp Reisner 318b411b363SPhilipp Reisner sg_init_table(&sg, 1); 319b411b363SPhilipp Reisner crypto_hash_init(&desc); 320b411b363SPhilipp Reisner 321b411b363SPhilipp Reisner __bio_for_each_segment(bvec, bio, i, 0) { 322b411b363SPhilipp Reisner sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); 323b411b363SPhilipp Reisner crypto_hash_update(&desc, &sg, sg.length); 324b411b363SPhilipp Reisner } 325b411b363SPhilipp Reisner crypto_hash_final(&desc, digest); 326b411b363SPhilipp Reisner } 327b411b363SPhilipp Reisner 328b411b363SPhilipp Reisner static int w_e_send_csum(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 329b411b363SPhilipp Reisner { 330b411b363SPhilipp Reisner struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); 331b411b363SPhilipp Reisner int digest_size; 332b411b363SPhilipp Reisner void *digest; 333b411b363SPhilipp Reisner int ok; 334b411b363SPhilipp Reisner 335b411b363SPhilipp Reisner D_ASSERT(e->block_id == DRBD_MAGIC + 0xbeef); 336b411b363SPhilipp Reisner 337b411b363SPhilipp Reisner if (unlikely(cancel)) { 338b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 339b411b363SPhilipp Reisner return 1; 340b411b363SPhilipp Reisner } 341b411b363SPhilipp Reisner 34245bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 343b411b363SPhilipp Reisner digest_size = crypto_hash_digestsize(mdev->csums_tfm); 344b411b363SPhilipp Reisner digest = kmalloc(digest_size, GFP_NOIO); 345b411b363SPhilipp Reisner if (digest) { 34645bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); 347b411b363SPhilipp Reisner 348b411b363SPhilipp Reisner inc_rs_pending(mdev); 349b411b363SPhilipp Reisner ok = drbd_send_drequest_csum(mdev, 350b411b363SPhilipp Reisner e->sector, 351b411b363SPhilipp Reisner e->size, 352b411b363SPhilipp Reisner digest, 353b411b363SPhilipp Reisner digest_size, 354b411b363SPhilipp Reisner P_CSUM_RS_REQUEST); 355b411b363SPhilipp Reisner kfree(digest); 356b411b363SPhilipp Reisner } else { 357b411b363SPhilipp Reisner dev_err(DEV, "kmalloc() of digest failed.\n"); 358b411b363SPhilipp Reisner ok = 0; 359b411b363SPhilipp Reisner } 360b411b363SPhilipp Reisner } else 361b411b363SPhilipp Reisner ok = 1; 362b411b363SPhilipp Reisner 363b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 364b411b363SPhilipp Reisner 365b411b363SPhilipp Reisner if (unlikely(!ok)) 366b411b363SPhilipp Reisner dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); 367b411b363SPhilipp Reisner return ok; 368b411b363SPhilipp Reisner } 369b411b363SPhilipp Reisner 370b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 371b411b363SPhilipp Reisner 372b411b363SPhilipp Reisner static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) 373b411b363SPhilipp Reisner { 374b411b363SPhilipp Reisner struct drbd_epoch_entry *e; 375b411b363SPhilipp Reisner 376b411b363SPhilipp Reisner if (!get_ldev(mdev)) 37780a40e43SLars Ellenberg return -EIO; 378b411b363SPhilipp Reisner 379b411b363SPhilipp Reisner /* GFP_TRY, because if there is no memory available right now, this may 380b411b363SPhilipp Reisner * be rescheduled for later. It is "only" background resync, after all. */ 381b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, DRBD_MAGIC+0xbeef, sector, size, GFP_TRY); 38245bb912bSLars Ellenberg if (!e) 38380a40e43SLars Ellenberg goto defer; 384b411b363SPhilipp Reisner 38580a40e43SLars Ellenberg e->w.cb = w_e_send_csum; 386b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 387b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->read_ee); 388b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 389b411b363SPhilipp Reisner 39045bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, READ, DRBD_FAULT_RS_RD) == 0) 39180a40e43SLars Ellenberg return 0; 39245bb912bSLars Ellenberg 39345bb912bSLars Ellenberg drbd_free_ee(mdev, e); 39480a40e43SLars Ellenberg defer: 39545bb912bSLars Ellenberg put_ldev(mdev); 39680a40e43SLars Ellenberg return -EAGAIN; 397b411b363SPhilipp Reisner } 398b411b363SPhilipp Reisner 399b411b363SPhilipp Reisner void resync_timer_fn(unsigned long data) 400b411b363SPhilipp Reisner { 401b411b363SPhilipp Reisner unsigned long flags; 402b411b363SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *) data; 403b411b363SPhilipp Reisner int queue; 404b411b363SPhilipp Reisner 405b411b363SPhilipp Reisner spin_lock_irqsave(&mdev->req_lock, flags); 406b411b363SPhilipp Reisner 407b411b363SPhilipp Reisner if (likely(!test_and_clear_bit(STOP_SYNC_TIMER, &mdev->flags))) { 408b411b363SPhilipp Reisner queue = 1; 409b411b363SPhilipp Reisner if (mdev->state.conn == C_VERIFY_S) 410b411b363SPhilipp Reisner mdev->resync_work.cb = w_make_ov_request; 411b411b363SPhilipp Reisner else 412b411b363SPhilipp Reisner mdev->resync_work.cb = w_make_resync_request; 413b411b363SPhilipp Reisner } else { 414b411b363SPhilipp Reisner queue = 0; 415b411b363SPhilipp Reisner mdev->resync_work.cb = w_resync_inactive; 416b411b363SPhilipp Reisner } 417b411b363SPhilipp Reisner 418b411b363SPhilipp Reisner spin_unlock_irqrestore(&mdev->req_lock, flags); 419b411b363SPhilipp Reisner 420b411b363SPhilipp Reisner /* harmless race: list_empty outside data.work.q_lock */ 421b411b363SPhilipp Reisner if (list_empty(&mdev->resync_work.list) && queue) 422b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, &mdev->resync_work); 423b411b363SPhilipp Reisner } 424b411b363SPhilipp Reisner 425778f271dSPhilipp Reisner static void fifo_set(struct fifo_buffer *fb, int value) 426778f271dSPhilipp Reisner { 427778f271dSPhilipp Reisner int i; 428778f271dSPhilipp Reisner 429778f271dSPhilipp Reisner for (i = 0; i < fb->size; i++) 430778f271dSPhilipp Reisner fb->values[i] += value; 431778f271dSPhilipp Reisner } 432778f271dSPhilipp Reisner 433778f271dSPhilipp Reisner static int fifo_push(struct fifo_buffer *fb, int value) 434778f271dSPhilipp Reisner { 435778f271dSPhilipp Reisner int ov; 436778f271dSPhilipp Reisner 437778f271dSPhilipp Reisner ov = fb->values[fb->head_index]; 438778f271dSPhilipp Reisner fb->values[fb->head_index++] = value; 439778f271dSPhilipp Reisner 440778f271dSPhilipp Reisner if (fb->head_index >= fb->size) 441778f271dSPhilipp Reisner fb->head_index = 0; 442778f271dSPhilipp Reisner 443778f271dSPhilipp Reisner return ov; 444778f271dSPhilipp Reisner } 445778f271dSPhilipp Reisner 446778f271dSPhilipp Reisner static void fifo_add_val(struct fifo_buffer *fb, int value) 447778f271dSPhilipp Reisner { 448778f271dSPhilipp Reisner int i; 449778f271dSPhilipp Reisner 450778f271dSPhilipp Reisner for (i = 0; i < fb->size; i++) 451778f271dSPhilipp Reisner fb->values[i] += value; 452778f271dSPhilipp Reisner } 453778f271dSPhilipp Reisner 454778f271dSPhilipp Reisner int drbd_rs_controller(struct drbd_conf *mdev) 455778f271dSPhilipp Reisner { 456778f271dSPhilipp Reisner unsigned int sect_in; /* Number of sectors that came in since the last turn */ 457778f271dSPhilipp Reisner unsigned int want; /* The number of sectors we want in the proxy */ 458778f271dSPhilipp Reisner int req_sect; /* Number of sectors to request in this turn */ 459778f271dSPhilipp Reisner int correction; /* Number of sectors more we need in the proxy*/ 460778f271dSPhilipp Reisner int cps; /* correction per invocation of drbd_rs_controller() */ 461778f271dSPhilipp Reisner int steps; /* Number of time steps to plan ahead */ 462778f271dSPhilipp Reisner int curr_corr; 463778f271dSPhilipp Reisner int max_sect; 464778f271dSPhilipp Reisner 465778f271dSPhilipp Reisner sect_in = atomic_xchg(&mdev->rs_sect_in, 0); /* Number of sectors that came in */ 466778f271dSPhilipp Reisner mdev->rs_in_flight -= sect_in; 467778f271dSPhilipp Reisner 468778f271dSPhilipp Reisner spin_lock(&mdev->peer_seq_lock); /* get an atomic view on mdev->rs_plan_s */ 469778f271dSPhilipp Reisner 470778f271dSPhilipp Reisner steps = mdev->rs_plan_s.size; /* (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ 471778f271dSPhilipp Reisner 472778f271dSPhilipp Reisner if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */ 473778f271dSPhilipp Reisner want = ((mdev->sync_conf.rate * 2 * SLEEP_TIME) / HZ) * steps; 474778f271dSPhilipp Reisner } else { /* normal path */ 475778f271dSPhilipp Reisner want = mdev->sync_conf.c_fill_target ? mdev->sync_conf.c_fill_target : 476778f271dSPhilipp Reisner sect_in * mdev->sync_conf.c_delay_target * HZ / (SLEEP_TIME * 10); 477778f271dSPhilipp Reisner } 478778f271dSPhilipp Reisner 479778f271dSPhilipp Reisner correction = want - mdev->rs_in_flight - mdev->rs_planed; 480778f271dSPhilipp Reisner 481778f271dSPhilipp Reisner /* Plan ahead */ 482778f271dSPhilipp Reisner cps = correction / steps; 483778f271dSPhilipp Reisner fifo_add_val(&mdev->rs_plan_s, cps); 484778f271dSPhilipp Reisner mdev->rs_planed += cps * steps; 485778f271dSPhilipp Reisner 486778f271dSPhilipp Reisner /* What we do in this step */ 487778f271dSPhilipp Reisner curr_corr = fifo_push(&mdev->rs_plan_s, 0); 488778f271dSPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 489778f271dSPhilipp Reisner mdev->rs_planed -= curr_corr; 490778f271dSPhilipp Reisner 491778f271dSPhilipp Reisner req_sect = sect_in + curr_corr; 492778f271dSPhilipp Reisner if (req_sect < 0) 493778f271dSPhilipp Reisner req_sect = 0; 494778f271dSPhilipp Reisner 495778f271dSPhilipp Reisner max_sect = (mdev->sync_conf.c_max_rate * 2 * SLEEP_TIME) / HZ; 496778f271dSPhilipp Reisner if (req_sect > max_sect) 497778f271dSPhilipp Reisner req_sect = max_sect; 498778f271dSPhilipp Reisner 499778f271dSPhilipp Reisner /* 500778f271dSPhilipp Reisner dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", 501778f271dSPhilipp Reisner sect_in, mdev->rs_in_flight, want, correction, 502778f271dSPhilipp Reisner steps, cps, mdev->rs_planed, curr_corr, req_sect); 503778f271dSPhilipp Reisner */ 504778f271dSPhilipp Reisner 505778f271dSPhilipp Reisner return req_sect; 506778f271dSPhilipp Reisner } 507778f271dSPhilipp Reisner 508b411b363SPhilipp Reisner int w_make_resync_request(struct drbd_conf *mdev, 509b411b363SPhilipp Reisner struct drbd_work *w, int cancel) 510b411b363SPhilipp Reisner { 511b411b363SPhilipp Reisner unsigned long bit; 512b411b363SPhilipp Reisner sector_t sector; 513b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 514bb3d000cSLars Ellenberg int max_segment_size; 515d207450cSPhilipp Reisner int number, i, rollback_i, size, pe, mx; 516b411b363SPhilipp Reisner int align, queued, sndbuf; 517b411b363SPhilipp Reisner 518b411b363SPhilipp Reisner if (unlikely(cancel)) 519b411b363SPhilipp Reisner return 1; 520b411b363SPhilipp Reisner 521b411b363SPhilipp Reisner if (unlikely(mdev->state.conn < C_CONNECTED)) { 522b411b363SPhilipp Reisner dev_err(DEV, "Confused in w_make_resync_request()! cstate < Connected"); 523b411b363SPhilipp Reisner return 0; 524b411b363SPhilipp Reisner } 525b411b363SPhilipp Reisner 526b411b363SPhilipp Reisner if (mdev->state.conn != C_SYNC_TARGET) 527b411b363SPhilipp Reisner dev_err(DEV, "%s in w_make_resync_request\n", 528b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 529b411b363SPhilipp Reisner 530b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 531b411b363SPhilipp Reisner /* Since we only need to access mdev->rsync a 532b411b363SPhilipp Reisner get_ldev_if_state(mdev,D_FAILED) would be sufficient, but 533b411b363SPhilipp Reisner to continue resync with a broken disk makes no sense at 534b411b363SPhilipp Reisner all */ 535b411b363SPhilipp Reisner dev_err(DEV, "Disk broke down during resync!\n"); 536b411b363SPhilipp Reisner mdev->resync_work.cb = w_resync_inactive; 537b411b363SPhilipp Reisner return 1; 538b411b363SPhilipp Reisner } 539b411b363SPhilipp Reisner 540bb3d000cSLars Ellenberg /* starting with drbd 8.3.8, we can handle multi-bio EEs, 541bb3d000cSLars Ellenberg * if it should be necessary */ 542bb3d000cSLars Ellenberg max_segment_size = mdev->agreed_pro_version < 94 ? 543bb3d000cSLars Ellenberg queue_max_segment_size(mdev->rq_queue) : DRBD_MAX_SEGMENT_SIZE; 544bb3d000cSLars Ellenberg 545778f271dSPhilipp Reisner if (mdev->rs_plan_s.size) { /* mdev->sync_conf.c_plan_ahead */ 546778f271dSPhilipp Reisner number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9); 547778f271dSPhilipp Reisner mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; 548778f271dSPhilipp Reisner } else { 549778f271dSPhilipp Reisner mdev->c_sync_rate = mdev->sync_conf.rate; 550778f271dSPhilipp Reisner number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); 551778f271dSPhilipp Reisner } 552b411b363SPhilipp Reisner pe = atomic_read(&mdev->rs_pending_cnt); 553b411b363SPhilipp Reisner 554b411b363SPhilipp Reisner mutex_lock(&mdev->data.mutex); 555b411b363SPhilipp Reisner if (mdev->data.socket) 556b411b363SPhilipp Reisner mx = mdev->data.socket->sk->sk_rcvbuf / sizeof(struct p_block_req); 557b411b363SPhilipp Reisner else 558b411b363SPhilipp Reisner mx = 1; 559b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 560b411b363SPhilipp Reisner 561b411b363SPhilipp Reisner /* For resync rates >160MB/sec, allow more pending RS requests */ 562b411b363SPhilipp Reisner if (number > mx) 563b411b363SPhilipp Reisner mx = number; 564b411b363SPhilipp Reisner 565b411b363SPhilipp Reisner /* Limit the number of pending RS requests to no more than the peer's receive buffer */ 566b411b363SPhilipp Reisner if ((pe + number) > mx) { 567b411b363SPhilipp Reisner number = mx - pe; 568b411b363SPhilipp Reisner } 569b411b363SPhilipp Reisner 570b411b363SPhilipp Reisner for (i = 0; i < number; i++) { 571b411b363SPhilipp Reisner /* Stop generating RS requests, when half of the send buffer is filled */ 572b411b363SPhilipp Reisner mutex_lock(&mdev->data.mutex); 573b411b363SPhilipp Reisner if (mdev->data.socket) { 574b411b363SPhilipp Reisner queued = mdev->data.socket->sk->sk_wmem_queued; 575b411b363SPhilipp Reisner sndbuf = mdev->data.socket->sk->sk_sndbuf; 576b411b363SPhilipp Reisner } else { 577b411b363SPhilipp Reisner queued = 1; 578b411b363SPhilipp Reisner sndbuf = 0; 579b411b363SPhilipp Reisner } 580b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 581b411b363SPhilipp Reisner if (queued > sndbuf / 2) 582b411b363SPhilipp Reisner goto requeue; 583b411b363SPhilipp Reisner 584b411b363SPhilipp Reisner next_sector: 585b411b363SPhilipp Reisner size = BM_BLOCK_SIZE; 586b411b363SPhilipp Reisner bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); 587b411b363SPhilipp Reisner 588b411b363SPhilipp Reisner if (bit == -1UL) { 589b411b363SPhilipp Reisner mdev->bm_resync_fo = drbd_bm_bits(mdev); 590b411b363SPhilipp Reisner mdev->resync_work.cb = w_resync_inactive; 591b411b363SPhilipp Reisner put_ldev(mdev); 592b411b363SPhilipp Reisner return 1; 593b411b363SPhilipp Reisner } 594b411b363SPhilipp Reisner 595b411b363SPhilipp Reisner sector = BM_BIT_TO_SECT(bit); 596b411b363SPhilipp Reisner 597b411b363SPhilipp Reisner if (drbd_try_rs_begin_io(mdev, sector)) { 598b411b363SPhilipp Reisner mdev->bm_resync_fo = bit; 599b411b363SPhilipp Reisner goto requeue; 600b411b363SPhilipp Reisner } 601b411b363SPhilipp Reisner mdev->bm_resync_fo = bit + 1; 602b411b363SPhilipp Reisner 603b411b363SPhilipp Reisner if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { 604b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 605b411b363SPhilipp Reisner goto next_sector; 606b411b363SPhilipp Reisner } 607b411b363SPhilipp Reisner 608b411b363SPhilipp Reisner #if DRBD_MAX_SEGMENT_SIZE > BM_BLOCK_SIZE 609b411b363SPhilipp Reisner /* try to find some adjacent bits. 610b411b363SPhilipp Reisner * we stop if we have already the maximum req size. 611b411b363SPhilipp Reisner * 612b411b363SPhilipp Reisner * Additionally always align bigger requests, in order to 613b411b363SPhilipp Reisner * be prepared for all stripe sizes of software RAIDs. 614b411b363SPhilipp Reisner */ 615b411b363SPhilipp Reisner align = 1; 616d207450cSPhilipp Reisner rollback_i = i; 617b411b363SPhilipp Reisner for (;;) { 618b411b363SPhilipp Reisner if (size + BM_BLOCK_SIZE > max_segment_size) 619b411b363SPhilipp Reisner break; 620b411b363SPhilipp Reisner 621b411b363SPhilipp Reisner /* Be always aligned */ 622b411b363SPhilipp Reisner if (sector & ((1<<(align+3))-1)) 623b411b363SPhilipp Reisner break; 624b411b363SPhilipp Reisner 625b411b363SPhilipp Reisner /* do not cross extent boundaries */ 626b411b363SPhilipp Reisner if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) 627b411b363SPhilipp Reisner break; 628b411b363SPhilipp Reisner /* now, is it actually dirty, after all? 629b411b363SPhilipp Reisner * caution, drbd_bm_test_bit is tri-state for some 630b411b363SPhilipp Reisner * obscure reason; ( b == 0 ) would get the out-of-band 631b411b363SPhilipp Reisner * only accidentally right because of the "oddly sized" 632b411b363SPhilipp Reisner * adjustment below */ 633b411b363SPhilipp Reisner if (drbd_bm_test_bit(mdev, bit+1) != 1) 634b411b363SPhilipp Reisner break; 635b411b363SPhilipp Reisner bit++; 636b411b363SPhilipp Reisner size += BM_BLOCK_SIZE; 637b411b363SPhilipp Reisner if ((BM_BLOCK_SIZE << align) <= size) 638b411b363SPhilipp Reisner align++; 639b411b363SPhilipp Reisner i++; 640b411b363SPhilipp Reisner } 641b411b363SPhilipp Reisner /* if we merged some, 642b411b363SPhilipp Reisner * reset the offset to start the next drbd_bm_find_next from */ 643b411b363SPhilipp Reisner if (size > BM_BLOCK_SIZE) 644b411b363SPhilipp Reisner mdev->bm_resync_fo = bit + 1; 645b411b363SPhilipp Reisner #endif 646b411b363SPhilipp Reisner 647b411b363SPhilipp Reisner /* adjust very last sectors, in case we are oddly sized */ 648b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) 649b411b363SPhilipp Reisner size = (capacity-sector)<<9; 650b411b363SPhilipp Reisner if (mdev->agreed_pro_version >= 89 && mdev->csums_tfm) { 651b411b363SPhilipp Reisner switch (read_for_csum(mdev, sector, size)) { 65280a40e43SLars Ellenberg case -EIO: /* Disk failure */ 653b411b363SPhilipp Reisner put_ldev(mdev); 654b411b363SPhilipp Reisner return 0; 65580a40e43SLars Ellenberg case -EAGAIN: /* allocation failed, or ldev busy */ 656b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 657b411b363SPhilipp Reisner mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 658d207450cSPhilipp Reisner i = rollback_i; 659b411b363SPhilipp Reisner goto requeue; 66080a40e43SLars Ellenberg case 0: 66180a40e43SLars Ellenberg /* everything ok */ 66280a40e43SLars Ellenberg break; 66380a40e43SLars Ellenberg default: 66480a40e43SLars Ellenberg BUG(); 665b411b363SPhilipp Reisner } 666b411b363SPhilipp Reisner } else { 667b411b363SPhilipp Reisner inc_rs_pending(mdev); 668b411b363SPhilipp Reisner if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST, 669b411b363SPhilipp Reisner sector, size, ID_SYNCER)) { 670b411b363SPhilipp Reisner dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); 671b411b363SPhilipp Reisner dec_rs_pending(mdev); 672b411b363SPhilipp Reisner put_ldev(mdev); 673b411b363SPhilipp Reisner return 0; 674b411b363SPhilipp Reisner } 675b411b363SPhilipp Reisner } 676b411b363SPhilipp Reisner } 677b411b363SPhilipp Reisner 678b411b363SPhilipp Reisner if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { 679b411b363SPhilipp Reisner /* last syncer _request_ was sent, 680b411b363SPhilipp Reisner * but the P_RS_DATA_REPLY not yet received. sync will end (and 681b411b363SPhilipp Reisner * next sync group will resume), as soon as we receive the last 682b411b363SPhilipp Reisner * resync data block, and the last bit is cleared. 683b411b363SPhilipp Reisner * until then resync "work" is "inactive" ... 684b411b363SPhilipp Reisner */ 685b411b363SPhilipp Reisner mdev->resync_work.cb = w_resync_inactive; 686b411b363SPhilipp Reisner put_ldev(mdev); 687b411b363SPhilipp Reisner return 1; 688b411b363SPhilipp Reisner } 689b411b363SPhilipp Reisner 690b411b363SPhilipp Reisner requeue: 691778f271dSPhilipp Reisner mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); 692b411b363SPhilipp Reisner mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); 693b411b363SPhilipp Reisner put_ldev(mdev); 694b411b363SPhilipp Reisner return 1; 695b411b363SPhilipp Reisner } 696b411b363SPhilipp Reisner 697b411b363SPhilipp Reisner static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 698b411b363SPhilipp Reisner { 699b411b363SPhilipp Reisner int number, i, size; 700b411b363SPhilipp Reisner sector_t sector; 701b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 702b411b363SPhilipp Reisner 703b411b363SPhilipp Reisner if (unlikely(cancel)) 704b411b363SPhilipp Reisner return 1; 705b411b363SPhilipp Reisner 706b411b363SPhilipp Reisner if (unlikely(mdev->state.conn < C_CONNECTED)) { 707b411b363SPhilipp Reisner dev_err(DEV, "Confused in w_make_ov_request()! cstate < Connected"); 708b411b363SPhilipp Reisner return 0; 709b411b363SPhilipp Reisner } 710b411b363SPhilipp Reisner 711b411b363SPhilipp Reisner number = SLEEP_TIME*mdev->sync_conf.rate / ((BM_BLOCK_SIZE/1024)*HZ); 712b411b363SPhilipp Reisner if (atomic_read(&mdev->rs_pending_cnt) > number) 713b411b363SPhilipp Reisner goto requeue; 714b411b363SPhilipp Reisner 715b411b363SPhilipp Reisner number -= atomic_read(&mdev->rs_pending_cnt); 716b411b363SPhilipp Reisner 717b411b363SPhilipp Reisner sector = mdev->ov_position; 718b411b363SPhilipp Reisner for (i = 0; i < number; i++) { 719b411b363SPhilipp Reisner if (sector >= capacity) { 720b411b363SPhilipp Reisner mdev->resync_work.cb = w_resync_inactive; 721b411b363SPhilipp Reisner return 1; 722b411b363SPhilipp Reisner } 723b411b363SPhilipp Reisner 724b411b363SPhilipp Reisner size = BM_BLOCK_SIZE; 725b411b363SPhilipp Reisner 726b411b363SPhilipp Reisner if (drbd_try_rs_begin_io(mdev, sector)) { 727b411b363SPhilipp Reisner mdev->ov_position = sector; 728b411b363SPhilipp Reisner goto requeue; 729b411b363SPhilipp Reisner } 730b411b363SPhilipp Reisner 731b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) 732b411b363SPhilipp Reisner size = (capacity-sector)<<9; 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner inc_rs_pending(mdev); 735b411b363SPhilipp Reisner if (!drbd_send_ov_request(mdev, sector, size)) { 736b411b363SPhilipp Reisner dec_rs_pending(mdev); 737b411b363SPhilipp Reisner return 0; 738b411b363SPhilipp Reisner } 739b411b363SPhilipp Reisner sector += BM_SECT_PER_BIT; 740b411b363SPhilipp Reisner } 741b411b363SPhilipp Reisner mdev->ov_position = sector; 742b411b363SPhilipp Reisner 743b411b363SPhilipp Reisner requeue: 744b411b363SPhilipp Reisner mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); 745b411b363SPhilipp Reisner return 1; 746b411b363SPhilipp Reisner } 747b411b363SPhilipp Reisner 748b411b363SPhilipp Reisner 749b411b363SPhilipp Reisner int w_ov_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 750b411b363SPhilipp Reisner { 751b411b363SPhilipp Reisner kfree(w); 752b411b363SPhilipp Reisner ov_oos_print(mdev); 753b411b363SPhilipp Reisner drbd_resync_finished(mdev); 754b411b363SPhilipp Reisner 755b411b363SPhilipp Reisner return 1; 756b411b363SPhilipp Reisner } 757b411b363SPhilipp Reisner 758b411b363SPhilipp Reisner static int w_resync_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 759b411b363SPhilipp Reisner { 760b411b363SPhilipp Reisner kfree(w); 761b411b363SPhilipp Reisner 762b411b363SPhilipp Reisner drbd_resync_finished(mdev); 763b411b363SPhilipp Reisner 764b411b363SPhilipp Reisner return 1; 765b411b363SPhilipp Reisner } 766b411b363SPhilipp Reisner 767b411b363SPhilipp Reisner int drbd_resync_finished(struct drbd_conf *mdev) 768b411b363SPhilipp Reisner { 769b411b363SPhilipp Reisner unsigned long db, dt, dbdt; 770b411b363SPhilipp Reisner unsigned long n_oos; 771b411b363SPhilipp Reisner union drbd_state os, ns; 772b411b363SPhilipp Reisner struct drbd_work *w; 773b411b363SPhilipp Reisner char *khelper_cmd = NULL; 774b411b363SPhilipp Reisner 775b411b363SPhilipp Reisner /* Remove all elements from the resync LRU. Since future actions 776b411b363SPhilipp Reisner * might set bits in the (main) bitmap, then the entries in the 777b411b363SPhilipp Reisner * resync LRU would be wrong. */ 778b411b363SPhilipp Reisner if (drbd_rs_del_all(mdev)) { 779b411b363SPhilipp Reisner /* In case this is not possible now, most probably because 780b411b363SPhilipp Reisner * there are P_RS_DATA_REPLY Packets lingering on the worker's 781b411b363SPhilipp Reisner * queue (or even the read operations for those packets 782b411b363SPhilipp Reisner * is not finished by now). Retry in 100ms. */ 783b411b363SPhilipp Reisner 784b411b363SPhilipp Reisner drbd_kick_lo(mdev); 785b411b363SPhilipp Reisner __set_current_state(TASK_INTERRUPTIBLE); 786b411b363SPhilipp Reisner schedule_timeout(HZ / 10); 787b411b363SPhilipp Reisner w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); 788b411b363SPhilipp Reisner if (w) { 789b411b363SPhilipp Reisner w->cb = w_resync_finished; 790b411b363SPhilipp Reisner drbd_queue_work(&mdev->data.work, w); 791b411b363SPhilipp Reisner return 1; 792b411b363SPhilipp Reisner } 793b411b363SPhilipp Reisner dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); 794b411b363SPhilipp Reisner } 795b411b363SPhilipp Reisner 796b411b363SPhilipp Reisner dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; 797b411b363SPhilipp Reisner if (dt <= 0) 798b411b363SPhilipp Reisner dt = 1; 799b411b363SPhilipp Reisner db = mdev->rs_total; 800b411b363SPhilipp Reisner dbdt = Bit2KB(db/dt); 801b411b363SPhilipp Reisner mdev->rs_paused /= HZ; 802b411b363SPhilipp Reisner 803b411b363SPhilipp Reisner if (!get_ldev(mdev)) 804b411b363SPhilipp Reisner goto out; 805b411b363SPhilipp Reisner 806b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 807b411b363SPhilipp Reisner os = mdev->state; 808b411b363SPhilipp Reisner 809b411b363SPhilipp Reisner /* This protects us against multiple calls (that can happen in the presence 810b411b363SPhilipp Reisner of application IO), and against connectivity loss just before we arrive here. */ 811b411b363SPhilipp Reisner if (os.conn <= C_CONNECTED) 812b411b363SPhilipp Reisner goto out_unlock; 813b411b363SPhilipp Reisner 814b411b363SPhilipp Reisner ns = os; 815b411b363SPhilipp Reisner ns.conn = C_CONNECTED; 816b411b363SPhilipp Reisner 817b411b363SPhilipp Reisner dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", 818b411b363SPhilipp Reisner (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) ? 819b411b363SPhilipp Reisner "Online verify " : "Resync", 820b411b363SPhilipp Reisner dt + mdev->rs_paused, mdev->rs_paused, dbdt); 821b411b363SPhilipp Reisner 822b411b363SPhilipp Reisner n_oos = drbd_bm_total_weight(mdev); 823b411b363SPhilipp Reisner 824b411b363SPhilipp Reisner if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { 825b411b363SPhilipp Reisner if (n_oos) { 826b411b363SPhilipp Reisner dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", 827b411b363SPhilipp Reisner n_oos, Bit2KB(1)); 828b411b363SPhilipp Reisner khelper_cmd = "out-of-sync"; 829b411b363SPhilipp Reisner } 830b411b363SPhilipp Reisner } else { 831b411b363SPhilipp Reisner D_ASSERT((n_oos - mdev->rs_failed) == 0); 832b411b363SPhilipp Reisner 833b411b363SPhilipp Reisner if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) 834b411b363SPhilipp Reisner khelper_cmd = "after-resync-target"; 835b411b363SPhilipp Reisner 836b411b363SPhilipp Reisner if (mdev->csums_tfm && mdev->rs_total) { 837b411b363SPhilipp Reisner const unsigned long s = mdev->rs_same_csum; 838b411b363SPhilipp Reisner const unsigned long t = mdev->rs_total; 839b411b363SPhilipp Reisner const int ratio = 840b411b363SPhilipp Reisner (t == 0) ? 0 : 841b411b363SPhilipp Reisner (t < 100000) ? ((s*100)/t) : (s/(t/100)); 842b411b363SPhilipp Reisner dev_info(DEV, "%u %% had equal check sums, eliminated: %luK; " 843b411b363SPhilipp Reisner "transferred %luK total %luK\n", 844b411b363SPhilipp Reisner ratio, 845b411b363SPhilipp Reisner Bit2KB(mdev->rs_same_csum), 846b411b363SPhilipp Reisner Bit2KB(mdev->rs_total - mdev->rs_same_csum), 847b411b363SPhilipp Reisner Bit2KB(mdev->rs_total)); 848b411b363SPhilipp Reisner } 849b411b363SPhilipp Reisner } 850b411b363SPhilipp Reisner 851b411b363SPhilipp Reisner if (mdev->rs_failed) { 852b411b363SPhilipp Reisner dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); 853b411b363SPhilipp Reisner 854b411b363SPhilipp Reisner if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { 855b411b363SPhilipp Reisner ns.disk = D_INCONSISTENT; 856b411b363SPhilipp Reisner ns.pdsk = D_UP_TO_DATE; 857b411b363SPhilipp Reisner } else { 858b411b363SPhilipp Reisner ns.disk = D_UP_TO_DATE; 859b411b363SPhilipp Reisner ns.pdsk = D_INCONSISTENT; 860b411b363SPhilipp Reisner } 861b411b363SPhilipp Reisner } else { 862b411b363SPhilipp Reisner ns.disk = D_UP_TO_DATE; 863b411b363SPhilipp Reisner ns.pdsk = D_UP_TO_DATE; 864b411b363SPhilipp Reisner 865b411b363SPhilipp Reisner if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { 866b411b363SPhilipp Reisner if (mdev->p_uuid) { 867b411b363SPhilipp Reisner int i; 868b411b363SPhilipp Reisner for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) 869b411b363SPhilipp Reisner _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); 870b411b363SPhilipp Reisner drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); 871b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); 872b411b363SPhilipp Reisner } else { 873b411b363SPhilipp Reisner dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); 874b411b363SPhilipp Reisner } 875b411b363SPhilipp Reisner } 876b411b363SPhilipp Reisner 877b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 878b411b363SPhilipp Reisner 879b411b363SPhilipp Reisner if (mdev->p_uuid) { 880b411b363SPhilipp Reisner /* Now the two UUID sets are equal, update what we 881b411b363SPhilipp Reisner * know of the peer. */ 882b411b363SPhilipp Reisner int i; 883b411b363SPhilipp Reisner for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) 884b411b363SPhilipp Reisner mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; 885b411b363SPhilipp Reisner } 886b411b363SPhilipp Reisner } 887b411b363SPhilipp Reisner 888b411b363SPhilipp Reisner _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 889b411b363SPhilipp Reisner out_unlock: 890b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 891b411b363SPhilipp Reisner put_ldev(mdev); 892b411b363SPhilipp Reisner out: 893b411b363SPhilipp Reisner mdev->rs_total = 0; 894b411b363SPhilipp Reisner mdev->rs_failed = 0; 895b411b363SPhilipp Reisner mdev->rs_paused = 0; 896b411b363SPhilipp Reisner mdev->ov_start_sector = 0; 897b411b363SPhilipp Reisner 898b411b363SPhilipp Reisner if (test_and_clear_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags)) { 899b411b363SPhilipp Reisner dev_warn(DEV, "Writing the whole bitmap, due to failed kmalloc\n"); 900b411b363SPhilipp Reisner drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished"); 901b411b363SPhilipp Reisner } 902b411b363SPhilipp Reisner 903b411b363SPhilipp Reisner if (khelper_cmd) 904b411b363SPhilipp Reisner drbd_khelper(mdev, khelper_cmd); 905b411b363SPhilipp Reisner 906b411b363SPhilipp Reisner return 1; 907b411b363SPhilipp Reisner } 908b411b363SPhilipp Reisner 909b411b363SPhilipp Reisner /* helper */ 910b411b363SPhilipp Reisner static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_epoch_entry *e) 911b411b363SPhilipp Reisner { 91245bb912bSLars Ellenberg if (drbd_ee_has_active_page(e)) { 913b411b363SPhilipp Reisner /* This might happen if sendpage() has not finished */ 914b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 915b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->net_ee); 916b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 917b411b363SPhilipp Reisner } else 918b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 919b411b363SPhilipp Reisner } 920b411b363SPhilipp Reisner 921b411b363SPhilipp Reisner /** 922b411b363SPhilipp Reisner * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST 923b411b363SPhilipp Reisner * @mdev: DRBD device. 924b411b363SPhilipp Reisner * @w: work object. 925b411b363SPhilipp Reisner * @cancel: The connection will be closed anyways 926b411b363SPhilipp Reisner */ 927b411b363SPhilipp Reisner int w_e_end_data_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 928b411b363SPhilipp Reisner { 929b411b363SPhilipp Reisner struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); 930b411b363SPhilipp Reisner int ok; 931b411b363SPhilipp Reisner 932b411b363SPhilipp Reisner if (unlikely(cancel)) { 933b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 934b411b363SPhilipp Reisner dec_unacked(mdev); 935b411b363SPhilipp Reisner return 1; 936b411b363SPhilipp Reisner } 937b411b363SPhilipp Reisner 93845bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 939b411b363SPhilipp Reisner ok = drbd_send_block(mdev, P_DATA_REPLY, e); 940b411b363SPhilipp Reisner } else { 941b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 942b411b363SPhilipp Reisner dev_err(DEV, "Sending NegDReply. sector=%llus.\n", 943b411b363SPhilipp Reisner (unsigned long long)e->sector); 944b411b363SPhilipp Reisner 945b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_DREPLY, e); 946b411b363SPhilipp Reisner } 947b411b363SPhilipp Reisner 948b411b363SPhilipp Reisner dec_unacked(mdev); 949b411b363SPhilipp Reisner 950b411b363SPhilipp Reisner move_to_net_ee_or_free(mdev, e); 951b411b363SPhilipp Reisner 952b411b363SPhilipp Reisner if (unlikely(!ok)) 953b411b363SPhilipp Reisner dev_err(DEV, "drbd_send_block() failed\n"); 954b411b363SPhilipp Reisner return ok; 955b411b363SPhilipp Reisner } 956b411b363SPhilipp Reisner 957b411b363SPhilipp Reisner /** 958b411b363SPhilipp Reisner * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS 959b411b363SPhilipp Reisner * @mdev: DRBD device. 960b411b363SPhilipp Reisner * @w: work object. 961b411b363SPhilipp Reisner * @cancel: The connection will be closed anyways 962b411b363SPhilipp Reisner */ 963b411b363SPhilipp Reisner int w_e_end_rsdata_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 964b411b363SPhilipp Reisner { 965b411b363SPhilipp Reisner struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); 966b411b363SPhilipp Reisner int ok; 967b411b363SPhilipp Reisner 968b411b363SPhilipp Reisner if (unlikely(cancel)) { 969b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 970b411b363SPhilipp Reisner dec_unacked(mdev); 971b411b363SPhilipp Reisner return 1; 972b411b363SPhilipp Reisner } 973b411b363SPhilipp Reisner 974b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 975b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, e->sector); 976b411b363SPhilipp Reisner put_ldev(mdev); 977b411b363SPhilipp Reisner } 978b411b363SPhilipp Reisner 97945bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 980b411b363SPhilipp Reisner if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { 981b411b363SPhilipp Reisner inc_rs_pending(mdev); 982b411b363SPhilipp Reisner ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); 983b411b363SPhilipp Reisner } else { 984b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 985b411b363SPhilipp Reisner dev_err(DEV, "Not sending RSDataReply, " 986b411b363SPhilipp Reisner "partner DISKLESS!\n"); 987b411b363SPhilipp Reisner ok = 1; 988b411b363SPhilipp Reisner } 989b411b363SPhilipp Reisner } else { 990b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 991b411b363SPhilipp Reisner dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", 992b411b363SPhilipp Reisner (unsigned long long)e->sector); 993b411b363SPhilipp Reisner 994b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); 995b411b363SPhilipp Reisner 996b411b363SPhilipp Reisner /* update resync data with failure */ 997b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, e->sector, e->size); 998b411b363SPhilipp Reisner } 999b411b363SPhilipp Reisner 1000b411b363SPhilipp Reisner dec_unacked(mdev); 1001b411b363SPhilipp Reisner 1002b411b363SPhilipp Reisner move_to_net_ee_or_free(mdev, e); 1003b411b363SPhilipp Reisner 1004b411b363SPhilipp Reisner if (unlikely(!ok)) 1005b411b363SPhilipp Reisner dev_err(DEV, "drbd_send_block() failed\n"); 1006b411b363SPhilipp Reisner return ok; 1007b411b363SPhilipp Reisner } 1008b411b363SPhilipp Reisner 1009b411b363SPhilipp Reisner int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1010b411b363SPhilipp Reisner { 1011b411b363SPhilipp Reisner struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); 1012b411b363SPhilipp Reisner struct digest_info *di; 1013b411b363SPhilipp Reisner int digest_size; 1014b411b363SPhilipp Reisner void *digest = NULL; 1015b411b363SPhilipp Reisner int ok, eq = 0; 1016b411b363SPhilipp Reisner 1017b411b363SPhilipp Reisner if (unlikely(cancel)) { 1018b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1019b411b363SPhilipp Reisner dec_unacked(mdev); 1020b411b363SPhilipp Reisner return 1; 1021b411b363SPhilipp Reisner } 1022b411b363SPhilipp Reisner 1023b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, e->sector); 1024b411b363SPhilipp Reisner 102585719573SPhilipp Reisner di = e->digest; 1026b411b363SPhilipp Reisner 102745bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1028b411b363SPhilipp Reisner /* quick hack to try to avoid a race against reconfiguration. 1029b411b363SPhilipp Reisner * a real fix would be much more involved, 1030b411b363SPhilipp Reisner * introducing more locking mechanisms */ 1031b411b363SPhilipp Reisner if (mdev->csums_tfm) { 1032b411b363SPhilipp Reisner digest_size = crypto_hash_digestsize(mdev->csums_tfm); 1033b411b363SPhilipp Reisner D_ASSERT(digest_size == di->digest_size); 1034b411b363SPhilipp Reisner digest = kmalloc(digest_size, GFP_NOIO); 1035b411b363SPhilipp Reisner } 1036b411b363SPhilipp Reisner if (digest) { 103745bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); 1038b411b363SPhilipp Reisner eq = !memcmp(digest, di->digest, digest_size); 1039b411b363SPhilipp Reisner kfree(digest); 1040b411b363SPhilipp Reisner } 1041b411b363SPhilipp Reisner 1042b411b363SPhilipp Reisner if (eq) { 1043b411b363SPhilipp Reisner drbd_set_in_sync(mdev, e->sector, e->size); 1044676396d5SLars Ellenberg /* rs_same_csums unit is BM_BLOCK_SIZE */ 1045676396d5SLars Ellenberg mdev->rs_same_csum += e->size >> BM_BLOCK_SHIFT; 1046b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, e); 1047b411b363SPhilipp Reisner } else { 1048b411b363SPhilipp Reisner inc_rs_pending(mdev); 1049b411b363SPhilipp Reisner e->block_id = ID_SYNCER; 1050b411b363SPhilipp Reisner ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); 1051b411b363SPhilipp Reisner } 1052b411b363SPhilipp Reisner } else { 1053b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); 1054b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1055b411b363SPhilipp Reisner dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); 1056b411b363SPhilipp Reisner } 1057b411b363SPhilipp Reisner 1058b411b363SPhilipp Reisner dec_unacked(mdev); 1059b411b363SPhilipp Reisner move_to_net_ee_or_free(mdev, e); 1060b411b363SPhilipp Reisner 1061b411b363SPhilipp Reisner if (unlikely(!ok)) 1062b411b363SPhilipp Reisner dev_err(DEV, "drbd_send_block/ack() failed\n"); 1063b411b363SPhilipp Reisner return ok; 1064b411b363SPhilipp Reisner } 1065b411b363SPhilipp Reisner 1066b411b363SPhilipp Reisner int w_e_end_ov_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1067b411b363SPhilipp Reisner { 1068b411b363SPhilipp Reisner struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); 1069b411b363SPhilipp Reisner int digest_size; 1070b411b363SPhilipp Reisner void *digest; 1071b411b363SPhilipp Reisner int ok = 1; 1072b411b363SPhilipp Reisner 1073b411b363SPhilipp Reisner if (unlikely(cancel)) 1074b411b363SPhilipp Reisner goto out; 1075b411b363SPhilipp Reisner 107645bb912bSLars Ellenberg if (unlikely((e->flags & EE_WAS_ERROR) != 0)) 1077b411b363SPhilipp Reisner goto out; 1078b411b363SPhilipp Reisner 1079b411b363SPhilipp Reisner digest_size = crypto_hash_digestsize(mdev->verify_tfm); 1080b411b363SPhilipp Reisner /* FIXME if this allocation fails, online verify will not terminate! */ 1081b411b363SPhilipp Reisner digest = kmalloc(digest_size, GFP_NOIO); 1082b411b363SPhilipp Reisner if (digest) { 108345bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); 1084b411b363SPhilipp Reisner inc_rs_pending(mdev); 1085b411b363SPhilipp Reisner ok = drbd_send_drequest_csum(mdev, e->sector, e->size, 1086b411b363SPhilipp Reisner digest, digest_size, P_OV_REPLY); 1087b411b363SPhilipp Reisner if (!ok) 1088b411b363SPhilipp Reisner dec_rs_pending(mdev); 1089b411b363SPhilipp Reisner kfree(digest); 1090b411b363SPhilipp Reisner } 1091b411b363SPhilipp Reisner 1092b411b363SPhilipp Reisner out: 1093b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1094b411b363SPhilipp Reisner 1095b411b363SPhilipp Reisner dec_unacked(mdev); 1096b411b363SPhilipp Reisner 1097b411b363SPhilipp Reisner return ok; 1098b411b363SPhilipp Reisner } 1099b411b363SPhilipp Reisner 1100b411b363SPhilipp Reisner void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size) 1101b411b363SPhilipp Reisner { 1102b411b363SPhilipp Reisner if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { 1103b411b363SPhilipp Reisner mdev->ov_last_oos_size += size>>9; 1104b411b363SPhilipp Reisner } else { 1105b411b363SPhilipp Reisner mdev->ov_last_oos_start = sector; 1106b411b363SPhilipp Reisner mdev->ov_last_oos_size = size>>9; 1107b411b363SPhilipp Reisner } 1108b411b363SPhilipp Reisner drbd_set_out_of_sync(mdev, sector, size); 1109b411b363SPhilipp Reisner set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags); 1110b411b363SPhilipp Reisner } 1111b411b363SPhilipp Reisner 1112b411b363SPhilipp Reisner int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1113b411b363SPhilipp Reisner { 1114b411b363SPhilipp Reisner struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); 1115b411b363SPhilipp Reisner struct digest_info *di; 1116b411b363SPhilipp Reisner int digest_size; 1117b411b363SPhilipp Reisner void *digest; 1118b411b363SPhilipp Reisner int ok, eq = 0; 1119b411b363SPhilipp Reisner 1120b411b363SPhilipp Reisner if (unlikely(cancel)) { 1121b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1122b411b363SPhilipp Reisner dec_unacked(mdev); 1123b411b363SPhilipp Reisner return 1; 1124b411b363SPhilipp Reisner } 1125b411b363SPhilipp Reisner 1126b411b363SPhilipp Reisner /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all 1127b411b363SPhilipp Reisner * the resync lru has been cleaned up already */ 1128b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, e->sector); 1129b411b363SPhilipp Reisner 113085719573SPhilipp Reisner di = e->digest; 1131b411b363SPhilipp Reisner 113245bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1133b411b363SPhilipp Reisner digest_size = crypto_hash_digestsize(mdev->verify_tfm); 1134b411b363SPhilipp Reisner digest = kmalloc(digest_size, GFP_NOIO); 1135b411b363SPhilipp Reisner if (digest) { 113645bb912bSLars Ellenberg drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); 1137b411b363SPhilipp Reisner 1138b411b363SPhilipp Reisner D_ASSERT(digest_size == di->digest_size); 1139b411b363SPhilipp Reisner eq = !memcmp(digest, di->digest, digest_size); 1140b411b363SPhilipp Reisner kfree(digest); 1141b411b363SPhilipp Reisner } 1142b411b363SPhilipp Reisner } else { 1143b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); 1144b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1145b411b363SPhilipp Reisner dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); 1146b411b363SPhilipp Reisner } 1147b411b363SPhilipp Reisner 1148b411b363SPhilipp Reisner dec_unacked(mdev); 1149b411b363SPhilipp Reisner if (!eq) 1150b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, e->sector, e->size); 1151b411b363SPhilipp Reisner else 1152b411b363SPhilipp Reisner ov_oos_print(mdev); 1153b411b363SPhilipp Reisner 1154b411b363SPhilipp Reisner ok = drbd_send_ack_ex(mdev, P_OV_RESULT, e->sector, e->size, 1155b411b363SPhilipp Reisner eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); 1156b411b363SPhilipp Reisner 1157b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1158b411b363SPhilipp Reisner 1159b411b363SPhilipp Reisner if (--mdev->ov_left == 0) { 1160b411b363SPhilipp Reisner ov_oos_print(mdev); 1161b411b363SPhilipp Reisner drbd_resync_finished(mdev); 1162b411b363SPhilipp Reisner } 1163b411b363SPhilipp Reisner 1164b411b363SPhilipp Reisner return ok; 1165b411b363SPhilipp Reisner } 1166b411b363SPhilipp Reisner 1167b411b363SPhilipp Reisner int w_prev_work_done(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1168b411b363SPhilipp Reisner { 1169b411b363SPhilipp Reisner struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); 1170b411b363SPhilipp Reisner complete(&b->done); 1171b411b363SPhilipp Reisner return 1; 1172b411b363SPhilipp Reisner } 1173b411b363SPhilipp Reisner 1174b411b363SPhilipp Reisner int w_send_barrier(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1175b411b363SPhilipp Reisner { 1176b411b363SPhilipp Reisner struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); 1177b411b363SPhilipp Reisner struct p_barrier *p = &mdev->data.sbuf.barrier; 1178b411b363SPhilipp Reisner int ok = 1; 1179b411b363SPhilipp Reisner 1180b411b363SPhilipp Reisner /* really avoid racing with tl_clear. w.cb may have been referenced 1181b411b363SPhilipp Reisner * just before it was reassigned and re-queued, so double check that. 1182b411b363SPhilipp Reisner * actually, this race was harmless, since we only try to send the 1183b411b363SPhilipp Reisner * barrier packet here, and otherwise do nothing with the object. 1184b411b363SPhilipp Reisner * but compare with the head of w_clear_epoch */ 1185b411b363SPhilipp Reisner spin_lock_irq(&mdev->req_lock); 1186b411b363SPhilipp Reisner if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) 1187b411b363SPhilipp Reisner cancel = 1; 1188b411b363SPhilipp Reisner spin_unlock_irq(&mdev->req_lock); 1189b411b363SPhilipp Reisner if (cancel) 1190b411b363SPhilipp Reisner return 1; 1191b411b363SPhilipp Reisner 1192b411b363SPhilipp Reisner if (!drbd_get_data_sock(mdev)) 1193b411b363SPhilipp Reisner return 0; 1194b411b363SPhilipp Reisner p->barrier = b->br_number; 1195b411b363SPhilipp Reisner /* inc_ap_pending was done where this was queued. 1196b411b363SPhilipp Reisner * dec_ap_pending will be done in got_BarrierAck 1197b411b363SPhilipp Reisner * or (on connection loss) in w_clear_epoch. */ 1198b411b363SPhilipp Reisner ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BARRIER, 1199b411b363SPhilipp Reisner (struct p_header *)p, sizeof(*p), 0); 1200b411b363SPhilipp Reisner drbd_put_data_sock(mdev); 1201b411b363SPhilipp Reisner 1202b411b363SPhilipp Reisner return ok; 1203b411b363SPhilipp Reisner } 1204b411b363SPhilipp Reisner 1205b411b363SPhilipp Reisner int w_send_write_hint(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1206b411b363SPhilipp Reisner { 1207b411b363SPhilipp Reisner if (cancel) 1208b411b363SPhilipp Reisner return 1; 1209b411b363SPhilipp Reisner return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE); 1210b411b363SPhilipp Reisner } 1211b411b363SPhilipp Reisner 1212b411b363SPhilipp Reisner /** 1213b411b363SPhilipp Reisner * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request 1214b411b363SPhilipp Reisner * @mdev: DRBD device. 1215b411b363SPhilipp Reisner * @w: work object. 1216b411b363SPhilipp Reisner * @cancel: The connection will be closed anyways 1217b411b363SPhilipp Reisner */ 1218b411b363SPhilipp Reisner int w_send_dblock(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1219b411b363SPhilipp Reisner { 1220b411b363SPhilipp Reisner struct drbd_request *req = container_of(w, struct drbd_request, w); 1221b411b363SPhilipp Reisner int ok; 1222b411b363SPhilipp Reisner 1223b411b363SPhilipp Reisner if (unlikely(cancel)) { 1224b411b363SPhilipp Reisner req_mod(req, send_canceled); 1225b411b363SPhilipp Reisner return 1; 1226b411b363SPhilipp Reisner } 1227b411b363SPhilipp Reisner 1228b411b363SPhilipp Reisner ok = drbd_send_dblock(mdev, req); 1229b411b363SPhilipp Reisner req_mod(req, ok ? handed_over_to_network : send_failed); 1230b411b363SPhilipp Reisner 1231b411b363SPhilipp Reisner return ok; 1232b411b363SPhilipp Reisner } 1233b411b363SPhilipp Reisner 1234b411b363SPhilipp Reisner /** 1235b411b363SPhilipp Reisner * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet 1236b411b363SPhilipp Reisner * @mdev: DRBD device. 1237b411b363SPhilipp Reisner * @w: work object. 1238b411b363SPhilipp Reisner * @cancel: The connection will be closed anyways 1239b411b363SPhilipp Reisner */ 1240b411b363SPhilipp Reisner int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1241b411b363SPhilipp Reisner { 1242b411b363SPhilipp Reisner struct drbd_request *req = container_of(w, struct drbd_request, w); 1243b411b363SPhilipp Reisner int ok; 1244b411b363SPhilipp Reisner 1245b411b363SPhilipp Reisner if (unlikely(cancel)) { 1246b411b363SPhilipp Reisner req_mod(req, send_canceled); 1247b411b363SPhilipp Reisner return 1; 1248b411b363SPhilipp Reisner } 1249b411b363SPhilipp Reisner 1250b411b363SPhilipp Reisner ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->sector, req->size, 1251b411b363SPhilipp Reisner (unsigned long)req); 1252b411b363SPhilipp Reisner 1253b411b363SPhilipp Reisner if (!ok) { 1254b411b363SPhilipp Reisner /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send(); 1255b411b363SPhilipp Reisner * so this is probably redundant */ 1256b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED) 1257b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 1258b411b363SPhilipp Reisner } 1259b411b363SPhilipp Reisner req_mod(req, ok ? handed_over_to_network : send_failed); 1260b411b363SPhilipp Reisner 1261b411b363SPhilipp Reisner return ok; 1262b411b363SPhilipp Reisner } 1263b411b363SPhilipp Reisner 1264265be2d0SPhilipp Reisner int w_restart_disk_io(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1265265be2d0SPhilipp Reisner { 1266265be2d0SPhilipp Reisner struct drbd_request *req = container_of(w, struct drbd_request, w); 1267265be2d0SPhilipp Reisner 1268265be2d0SPhilipp Reisner if (bio_data_dir(req->master_bio) == WRITE) 1269265be2d0SPhilipp Reisner drbd_al_begin_io(mdev, req->sector); 1270265be2d0SPhilipp Reisner /* Calling drbd_al_begin_io() out of the worker might deadlocks 1271265be2d0SPhilipp Reisner theoretically. Practically it can not deadlock, since this is 1272265be2d0SPhilipp Reisner only used when unfreezing IOs. All the extents of the requests 1273265be2d0SPhilipp Reisner that made it into the TL are already active */ 1274265be2d0SPhilipp Reisner 1275265be2d0SPhilipp Reisner drbd_req_make_private_bio(req, req->master_bio); 1276265be2d0SPhilipp Reisner req->private_bio->bi_bdev = mdev->ldev->backing_bdev; 1277265be2d0SPhilipp Reisner generic_make_request(req->private_bio); 1278265be2d0SPhilipp Reisner 1279265be2d0SPhilipp Reisner return 1; 1280265be2d0SPhilipp Reisner } 1281265be2d0SPhilipp Reisner 1282b411b363SPhilipp Reisner static int _drbd_may_sync_now(struct drbd_conf *mdev) 1283b411b363SPhilipp Reisner { 1284b411b363SPhilipp Reisner struct drbd_conf *odev = mdev; 1285b411b363SPhilipp Reisner 1286b411b363SPhilipp Reisner while (1) { 1287b411b363SPhilipp Reisner if (odev->sync_conf.after == -1) 1288b411b363SPhilipp Reisner return 1; 1289b411b363SPhilipp Reisner odev = minor_to_mdev(odev->sync_conf.after); 1290b411b363SPhilipp Reisner ERR_IF(!odev) return 1; 1291b411b363SPhilipp Reisner if ((odev->state.conn >= C_SYNC_SOURCE && 1292b411b363SPhilipp Reisner odev->state.conn <= C_PAUSED_SYNC_T) || 1293b411b363SPhilipp Reisner odev->state.aftr_isp || odev->state.peer_isp || 1294b411b363SPhilipp Reisner odev->state.user_isp) 1295b411b363SPhilipp Reisner return 0; 1296b411b363SPhilipp Reisner } 1297b411b363SPhilipp Reisner } 1298b411b363SPhilipp Reisner 1299b411b363SPhilipp Reisner /** 1300b411b363SPhilipp Reisner * _drbd_pause_after() - Pause resync on all devices that may not resync now 1301b411b363SPhilipp Reisner * @mdev: DRBD device. 1302b411b363SPhilipp Reisner * 1303b411b363SPhilipp Reisner * Called from process context only (admin command and after_state_ch). 1304b411b363SPhilipp Reisner */ 1305b411b363SPhilipp Reisner static int _drbd_pause_after(struct drbd_conf *mdev) 1306b411b363SPhilipp Reisner { 1307b411b363SPhilipp Reisner struct drbd_conf *odev; 1308b411b363SPhilipp Reisner int i, rv = 0; 1309b411b363SPhilipp Reisner 1310b411b363SPhilipp Reisner for (i = 0; i < minor_count; i++) { 1311b411b363SPhilipp Reisner odev = minor_to_mdev(i); 1312b411b363SPhilipp Reisner if (!odev) 1313b411b363SPhilipp Reisner continue; 1314b411b363SPhilipp Reisner if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) 1315b411b363SPhilipp Reisner continue; 1316b411b363SPhilipp Reisner if (!_drbd_may_sync_now(odev)) 1317b411b363SPhilipp Reisner rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) 1318b411b363SPhilipp Reisner != SS_NOTHING_TO_DO); 1319b411b363SPhilipp Reisner } 1320b411b363SPhilipp Reisner 1321b411b363SPhilipp Reisner return rv; 1322b411b363SPhilipp Reisner } 1323b411b363SPhilipp Reisner 1324b411b363SPhilipp Reisner /** 1325b411b363SPhilipp Reisner * _drbd_resume_next() - Resume resync on all devices that may resync now 1326b411b363SPhilipp Reisner * @mdev: DRBD device. 1327b411b363SPhilipp Reisner * 1328b411b363SPhilipp Reisner * Called from process context only (admin command and worker). 1329b411b363SPhilipp Reisner */ 1330b411b363SPhilipp Reisner static int _drbd_resume_next(struct drbd_conf *mdev) 1331b411b363SPhilipp Reisner { 1332b411b363SPhilipp Reisner struct drbd_conf *odev; 1333b411b363SPhilipp Reisner int i, rv = 0; 1334b411b363SPhilipp Reisner 1335b411b363SPhilipp Reisner for (i = 0; i < minor_count; i++) { 1336b411b363SPhilipp Reisner odev = minor_to_mdev(i); 1337b411b363SPhilipp Reisner if (!odev) 1338b411b363SPhilipp Reisner continue; 1339b411b363SPhilipp Reisner if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) 1340b411b363SPhilipp Reisner continue; 1341b411b363SPhilipp Reisner if (odev->state.aftr_isp) { 1342b411b363SPhilipp Reisner if (_drbd_may_sync_now(odev)) 1343b411b363SPhilipp Reisner rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), 1344b411b363SPhilipp Reisner CS_HARD, NULL) 1345b411b363SPhilipp Reisner != SS_NOTHING_TO_DO) ; 1346b411b363SPhilipp Reisner } 1347b411b363SPhilipp Reisner } 1348b411b363SPhilipp Reisner return rv; 1349b411b363SPhilipp Reisner } 1350b411b363SPhilipp Reisner 1351b411b363SPhilipp Reisner void resume_next_sg(struct drbd_conf *mdev) 1352b411b363SPhilipp Reisner { 1353b411b363SPhilipp Reisner write_lock_irq(&global_state_lock); 1354b411b363SPhilipp Reisner _drbd_resume_next(mdev); 1355b411b363SPhilipp Reisner write_unlock_irq(&global_state_lock); 1356b411b363SPhilipp Reisner } 1357b411b363SPhilipp Reisner 1358b411b363SPhilipp Reisner void suspend_other_sg(struct drbd_conf *mdev) 1359b411b363SPhilipp Reisner { 1360b411b363SPhilipp Reisner write_lock_irq(&global_state_lock); 1361b411b363SPhilipp Reisner _drbd_pause_after(mdev); 1362b411b363SPhilipp Reisner write_unlock_irq(&global_state_lock); 1363b411b363SPhilipp Reisner } 1364b411b363SPhilipp Reisner 1365b411b363SPhilipp Reisner static int sync_after_error(struct drbd_conf *mdev, int o_minor) 1366b411b363SPhilipp Reisner { 1367b411b363SPhilipp Reisner struct drbd_conf *odev; 1368b411b363SPhilipp Reisner 1369b411b363SPhilipp Reisner if (o_minor == -1) 1370b411b363SPhilipp Reisner return NO_ERROR; 1371b411b363SPhilipp Reisner if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) 1372b411b363SPhilipp Reisner return ERR_SYNC_AFTER; 1373b411b363SPhilipp Reisner 1374b411b363SPhilipp Reisner /* check for loops */ 1375b411b363SPhilipp Reisner odev = minor_to_mdev(o_minor); 1376b411b363SPhilipp Reisner while (1) { 1377b411b363SPhilipp Reisner if (odev == mdev) 1378b411b363SPhilipp Reisner return ERR_SYNC_AFTER_CYCLE; 1379b411b363SPhilipp Reisner 1380b411b363SPhilipp Reisner /* dependency chain ends here, no cycles. */ 1381b411b363SPhilipp Reisner if (odev->sync_conf.after == -1) 1382b411b363SPhilipp Reisner return NO_ERROR; 1383b411b363SPhilipp Reisner 1384b411b363SPhilipp Reisner /* follow the dependency chain */ 1385b411b363SPhilipp Reisner odev = minor_to_mdev(odev->sync_conf.after); 1386b411b363SPhilipp Reisner } 1387b411b363SPhilipp Reisner } 1388b411b363SPhilipp Reisner 1389b411b363SPhilipp Reisner int drbd_alter_sa(struct drbd_conf *mdev, int na) 1390b411b363SPhilipp Reisner { 1391b411b363SPhilipp Reisner int changes; 1392b411b363SPhilipp Reisner int retcode; 1393b411b363SPhilipp Reisner 1394b411b363SPhilipp Reisner write_lock_irq(&global_state_lock); 1395b411b363SPhilipp Reisner retcode = sync_after_error(mdev, na); 1396b411b363SPhilipp Reisner if (retcode == NO_ERROR) { 1397b411b363SPhilipp Reisner mdev->sync_conf.after = na; 1398b411b363SPhilipp Reisner do { 1399b411b363SPhilipp Reisner changes = _drbd_pause_after(mdev); 1400b411b363SPhilipp Reisner changes |= _drbd_resume_next(mdev); 1401b411b363SPhilipp Reisner } while (changes); 1402b411b363SPhilipp Reisner } 1403b411b363SPhilipp Reisner write_unlock_irq(&global_state_lock); 1404b411b363SPhilipp Reisner return retcode; 1405b411b363SPhilipp Reisner } 1406b411b363SPhilipp Reisner 1407309d1608SPhilipp Reisner static void ping_peer(struct drbd_conf *mdev) 1408309d1608SPhilipp Reisner { 1409309d1608SPhilipp Reisner clear_bit(GOT_PING_ACK, &mdev->flags); 1410309d1608SPhilipp Reisner request_ping(mdev); 1411309d1608SPhilipp Reisner wait_event(mdev->misc_wait, 1412309d1608SPhilipp Reisner test_bit(GOT_PING_ACK, &mdev->flags) || mdev->state.conn < C_CONNECTED); 1413309d1608SPhilipp Reisner } 1414309d1608SPhilipp Reisner 1415b411b363SPhilipp Reisner /** 1416b411b363SPhilipp Reisner * drbd_start_resync() - Start the resync process 1417b411b363SPhilipp Reisner * @mdev: DRBD device. 1418b411b363SPhilipp Reisner * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET 1419b411b363SPhilipp Reisner * 1420b411b363SPhilipp Reisner * This function might bring you directly into one of the 1421b411b363SPhilipp Reisner * C_PAUSED_SYNC_* states. 1422b411b363SPhilipp Reisner */ 1423b411b363SPhilipp Reisner void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) 1424b411b363SPhilipp Reisner { 1425b411b363SPhilipp Reisner union drbd_state ns; 1426b411b363SPhilipp Reisner int r; 1427b411b363SPhilipp Reisner 1428b411b363SPhilipp Reisner if (mdev->state.conn >= C_SYNC_SOURCE) { 1429b411b363SPhilipp Reisner dev_err(DEV, "Resync already running!\n"); 1430b411b363SPhilipp Reisner return; 1431b411b363SPhilipp Reisner } 1432b411b363SPhilipp Reisner 1433b411b363SPhilipp Reisner /* In case a previous resync run was aborted by an IO error/detach on the peer. */ 1434b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 1435b411b363SPhilipp Reisner 1436b411b363SPhilipp Reisner if (side == C_SYNC_TARGET) { 1437b411b363SPhilipp Reisner /* Since application IO was locked out during C_WF_BITMAP_T and 1438b411b363SPhilipp Reisner C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET 1439b411b363SPhilipp Reisner we check that we might make the data inconsistent. */ 1440b411b363SPhilipp Reisner r = drbd_khelper(mdev, "before-resync-target"); 1441b411b363SPhilipp Reisner r = (r >> 8) & 0xff; 1442b411b363SPhilipp Reisner if (r > 0) { 1443b411b363SPhilipp Reisner dev_info(DEV, "before-resync-target handler returned %d, " 1444b411b363SPhilipp Reisner "dropping connection.\n", r); 1445b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 1446b411b363SPhilipp Reisner return; 1447b411b363SPhilipp Reisner } 1448b411b363SPhilipp Reisner } 1449b411b363SPhilipp Reisner 1450b411b363SPhilipp Reisner drbd_state_lock(mdev); 1451b411b363SPhilipp Reisner 1452b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { 1453b411b363SPhilipp Reisner drbd_state_unlock(mdev); 1454b411b363SPhilipp Reisner return; 1455b411b363SPhilipp Reisner } 1456b411b363SPhilipp Reisner 1457b411b363SPhilipp Reisner if (side == C_SYNC_TARGET) { 1458b411b363SPhilipp Reisner mdev->bm_resync_fo = 0; 1459b411b363SPhilipp Reisner } else /* side == C_SYNC_SOURCE */ { 1460b411b363SPhilipp Reisner u64 uuid; 1461b411b363SPhilipp Reisner 1462b411b363SPhilipp Reisner get_random_bytes(&uuid, sizeof(u64)); 1463b411b363SPhilipp Reisner drbd_uuid_set(mdev, UI_BITMAP, uuid); 1464b411b363SPhilipp Reisner drbd_send_sync_uuid(mdev, uuid); 1465b411b363SPhilipp Reisner 1466b411b363SPhilipp Reisner D_ASSERT(mdev->state.disk == D_UP_TO_DATE); 1467b411b363SPhilipp Reisner } 1468b411b363SPhilipp Reisner 1469b411b363SPhilipp Reisner write_lock_irq(&global_state_lock); 1470b411b363SPhilipp Reisner ns = mdev->state; 1471b411b363SPhilipp Reisner 1472b411b363SPhilipp Reisner ns.aftr_isp = !_drbd_may_sync_now(mdev); 1473b411b363SPhilipp Reisner 1474b411b363SPhilipp Reisner ns.conn = side; 1475b411b363SPhilipp Reisner 1476b411b363SPhilipp Reisner if (side == C_SYNC_TARGET) 1477b411b363SPhilipp Reisner ns.disk = D_INCONSISTENT; 1478b411b363SPhilipp Reisner else /* side == C_SYNC_SOURCE */ 1479b411b363SPhilipp Reisner ns.pdsk = D_INCONSISTENT; 1480b411b363SPhilipp Reisner 1481b411b363SPhilipp Reisner r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 1482b411b363SPhilipp Reisner ns = mdev->state; 1483b411b363SPhilipp Reisner 1484b411b363SPhilipp Reisner if (ns.conn < C_CONNECTED) 1485b411b363SPhilipp Reisner r = SS_UNKNOWN_ERROR; 1486b411b363SPhilipp Reisner 1487b411b363SPhilipp Reisner if (r == SS_SUCCESS) { 14881d7734a0SLars Ellenberg unsigned long tw = drbd_bm_total_weight(mdev); 14891d7734a0SLars Ellenberg unsigned long now = jiffies; 14901d7734a0SLars Ellenberg int i; 14911d7734a0SLars Ellenberg 1492b411b363SPhilipp Reisner mdev->rs_failed = 0; 1493b411b363SPhilipp Reisner mdev->rs_paused = 0; 1494b411b363SPhilipp Reisner mdev->rs_same_csum = 0; 14951d7734a0SLars Ellenberg mdev->rs_total = tw; 14961d7734a0SLars Ellenberg mdev->rs_start = now; 14971d7734a0SLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 14981d7734a0SLars Ellenberg mdev->rs_mark_left[i] = tw; 14991d7734a0SLars Ellenberg mdev->rs_mark_time[i] = now; 15001d7734a0SLars Ellenberg } 1501b411b363SPhilipp Reisner _drbd_pause_after(mdev); 1502b411b363SPhilipp Reisner } 1503b411b363SPhilipp Reisner write_unlock_irq(&global_state_lock); 1504b411b363SPhilipp Reisner put_ldev(mdev); 1505b411b363SPhilipp Reisner 1506b411b363SPhilipp Reisner if (r == SS_SUCCESS) { 1507b411b363SPhilipp Reisner dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", 1508b411b363SPhilipp Reisner drbd_conn_str(ns.conn), 1509b411b363SPhilipp Reisner (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), 1510b411b363SPhilipp Reisner (unsigned long) mdev->rs_total); 1511b411b363SPhilipp Reisner 1512b411b363SPhilipp Reisner if (mdev->rs_total == 0) { 1513b411b363SPhilipp Reisner /* Peer still reachable? Beware of failing before-resync-target handlers! */ 1514309d1608SPhilipp Reisner ping_peer(mdev); 1515b411b363SPhilipp Reisner drbd_resync_finished(mdev); 1516b411b363SPhilipp Reisner } 1517b411b363SPhilipp Reisner 1518778f271dSPhilipp Reisner atomic_set(&mdev->rs_sect_in, 0); 1519778f271dSPhilipp Reisner mdev->rs_in_flight = 0; 1520778f271dSPhilipp Reisner mdev->rs_planed = 0; 1521778f271dSPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1522778f271dSPhilipp Reisner fifo_set(&mdev->rs_plan_s, 0); 1523778f271dSPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1524b411b363SPhilipp Reisner /* ns.conn may already be != mdev->state.conn, 1525b411b363SPhilipp Reisner * we may have been paused in between, or become paused until 1526b411b363SPhilipp Reisner * the timer triggers. 1527b411b363SPhilipp Reisner * No matter, that is handled in resync_timer_fn() */ 1528b411b363SPhilipp Reisner if (ns.conn == C_SYNC_TARGET) 1529b411b363SPhilipp Reisner mod_timer(&mdev->resync_timer, jiffies); 1530b411b363SPhilipp Reisner 1531b411b363SPhilipp Reisner drbd_md_sync(mdev); 1532b411b363SPhilipp Reisner } 1533d0c3f60fSPhilipp Reisner drbd_state_unlock(mdev); 1534b411b363SPhilipp Reisner } 1535b411b363SPhilipp Reisner 1536b411b363SPhilipp Reisner int drbd_worker(struct drbd_thread *thi) 1537b411b363SPhilipp Reisner { 1538b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 1539b411b363SPhilipp Reisner struct drbd_work *w = NULL; 1540b411b363SPhilipp Reisner LIST_HEAD(work_list); 1541b411b363SPhilipp Reisner int intr = 0, i; 1542b411b363SPhilipp Reisner 1543b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_worker", mdev_to_minor(mdev)); 1544b411b363SPhilipp Reisner 1545b411b363SPhilipp Reisner while (get_t_state(thi) == Running) { 1546b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 1547b411b363SPhilipp Reisner 1548b411b363SPhilipp Reisner if (down_trylock(&mdev->data.work.s)) { 1549b411b363SPhilipp Reisner mutex_lock(&mdev->data.mutex); 1550b411b363SPhilipp Reisner if (mdev->data.socket && !mdev->net_conf->no_cork) 1551b411b363SPhilipp Reisner drbd_tcp_uncork(mdev->data.socket); 1552b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 1553b411b363SPhilipp Reisner 1554b411b363SPhilipp Reisner intr = down_interruptible(&mdev->data.work.s); 1555b411b363SPhilipp Reisner 1556b411b363SPhilipp Reisner mutex_lock(&mdev->data.mutex); 1557b411b363SPhilipp Reisner if (mdev->data.socket && !mdev->net_conf->no_cork) 1558b411b363SPhilipp Reisner drbd_tcp_cork(mdev->data.socket); 1559b411b363SPhilipp Reisner mutex_unlock(&mdev->data.mutex); 1560b411b363SPhilipp Reisner } 1561b411b363SPhilipp Reisner 1562b411b363SPhilipp Reisner if (intr) { 1563b411b363SPhilipp Reisner D_ASSERT(intr == -EINTR); 1564b411b363SPhilipp Reisner flush_signals(current); 1565b411b363SPhilipp Reisner ERR_IF (get_t_state(thi) == Running) 1566b411b363SPhilipp Reisner continue; 1567b411b363SPhilipp Reisner break; 1568b411b363SPhilipp Reisner } 1569b411b363SPhilipp Reisner 1570b411b363SPhilipp Reisner if (get_t_state(thi) != Running) 1571b411b363SPhilipp Reisner break; 1572b411b363SPhilipp Reisner /* With this break, we have done a down() but not consumed 1573b411b363SPhilipp Reisner the entry from the list. The cleanup code takes care of 1574b411b363SPhilipp Reisner this... */ 1575b411b363SPhilipp Reisner 1576b411b363SPhilipp Reisner w = NULL; 1577b411b363SPhilipp Reisner spin_lock_irq(&mdev->data.work.q_lock); 1578b411b363SPhilipp Reisner ERR_IF(list_empty(&mdev->data.work.q)) { 1579b411b363SPhilipp Reisner /* something terribly wrong in our logic. 1580b411b363SPhilipp Reisner * we were able to down() the semaphore, 1581b411b363SPhilipp Reisner * but the list is empty... doh. 1582b411b363SPhilipp Reisner * 1583b411b363SPhilipp Reisner * what is the best thing to do now? 1584b411b363SPhilipp Reisner * try again from scratch, restarting the receiver, 1585b411b363SPhilipp Reisner * asender, whatnot? could break even more ugly, 1586b411b363SPhilipp Reisner * e.g. when we are primary, but no good local data. 1587b411b363SPhilipp Reisner * 1588b411b363SPhilipp Reisner * I'll try to get away just starting over this loop. 1589b411b363SPhilipp Reisner */ 1590b411b363SPhilipp Reisner spin_unlock_irq(&mdev->data.work.q_lock); 1591b411b363SPhilipp Reisner continue; 1592b411b363SPhilipp Reisner } 1593b411b363SPhilipp Reisner w = list_entry(mdev->data.work.q.next, struct drbd_work, list); 1594b411b363SPhilipp Reisner list_del_init(&w->list); 1595b411b363SPhilipp Reisner spin_unlock_irq(&mdev->data.work.q_lock); 1596b411b363SPhilipp Reisner 1597b411b363SPhilipp Reisner if (!w->cb(mdev, w, mdev->state.conn < C_CONNECTED)) { 1598b411b363SPhilipp Reisner /* dev_warn(DEV, "worker: a callback failed! \n"); */ 1599b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED) 1600b411b363SPhilipp Reisner drbd_force_state(mdev, 1601b411b363SPhilipp Reisner NS(conn, C_NETWORK_FAILURE)); 1602b411b363SPhilipp Reisner } 1603b411b363SPhilipp Reisner } 1604b411b363SPhilipp Reisner D_ASSERT(test_bit(DEVICE_DYING, &mdev->flags)); 1605b411b363SPhilipp Reisner D_ASSERT(test_bit(CONFIG_PENDING, &mdev->flags)); 1606b411b363SPhilipp Reisner 1607b411b363SPhilipp Reisner spin_lock_irq(&mdev->data.work.q_lock); 1608b411b363SPhilipp Reisner i = 0; 1609b411b363SPhilipp Reisner while (!list_empty(&mdev->data.work.q)) { 1610b411b363SPhilipp Reisner list_splice_init(&mdev->data.work.q, &work_list); 1611b411b363SPhilipp Reisner spin_unlock_irq(&mdev->data.work.q_lock); 1612b411b363SPhilipp Reisner 1613b411b363SPhilipp Reisner while (!list_empty(&work_list)) { 1614b411b363SPhilipp Reisner w = list_entry(work_list.next, struct drbd_work, list); 1615b411b363SPhilipp Reisner list_del_init(&w->list); 1616b411b363SPhilipp Reisner w->cb(mdev, w, 1); 1617b411b363SPhilipp Reisner i++; /* dead debugging code */ 1618b411b363SPhilipp Reisner } 1619b411b363SPhilipp Reisner 1620b411b363SPhilipp Reisner spin_lock_irq(&mdev->data.work.q_lock); 1621b411b363SPhilipp Reisner } 1622b411b363SPhilipp Reisner sema_init(&mdev->data.work.s, 0); 1623b411b363SPhilipp Reisner /* DANGEROUS race: if someone did queue his work within the spinlock, 1624b411b363SPhilipp Reisner * but up() ed outside the spinlock, we could get an up() on the 1625b411b363SPhilipp Reisner * semaphore without corresponding list entry. 1626b411b363SPhilipp Reisner * So don't do that. 1627b411b363SPhilipp Reisner */ 1628b411b363SPhilipp Reisner spin_unlock_irq(&mdev->data.work.q_lock); 1629b411b363SPhilipp Reisner 1630b411b363SPhilipp Reisner D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); 1631b411b363SPhilipp Reisner /* _drbd_set_state only uses stop_nowait. 1632b411b363SPhilipp Reisner * wait here for the Exiting receiver. */ 1633b411b363SPhilipp Reisner drbd_thread_stop(&mdev->receiver); 1634b411b363SPhilipp Reisner drbd_mdev_cleanup(mdev); 1635b411b363SPhilipp Reisner 1636b411b363SPhilipp Reisner dev_info(DEV, "worker terminated\n"); 1637b411b363SPhilipp Reisner 1638b411b363SPhilipp Reisner clear_bit(DEVICE_DYING, &mdev->flags); 1639b411b363SPhilipp Reisner clear_bit(CONFIG_PENDING, &mdev->flags); 1640b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 1641b411b363SPhilipp Reisner 1642b411b363SPhilipp Reisner return 0; 1643b411b363SPhilipp Reisner } 1644