![Huang Weiyi](/assets/img/avatar_default.png)
Remove unused #include <linux/version.h>('s) in drivers/block/drbd/drbd_main.c drivers/block/drbd/drbd_receiver.c drivers/block/drbd/drbd_worker.c Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com> Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
1511 lines
39 KiB
C
1511 lines
39 KiB
C
/*
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drbd_worker.c
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
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Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
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Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
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drbd is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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drbd is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with drbd; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/drbd.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/memcontrol.h>
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#include <linux/mm_inline.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/string.h>
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#include <linux/scatterlist.h>
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#include "drbd_int.h"
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#include "drbd_req.h"
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#define SLEEP_TIME (HZ/10)
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static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel);
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/* defined here:
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drbd_md_io_complete
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drbd_endio_write_sec
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drbd_endio_read_sec
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drbd_endio_pri
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* more endio handlers:
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atodb_endio in drbd_actlog.c
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drbd_bm_async_io_complete in drbd_bitmap.c
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* For all these callbacks, note the following:
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* The callbacks will be called in irq context by the IDE drivers,
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* and in Softirqs/Tasklets/BH context by the SCSI drivers.
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* Try to get the locking right :)
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*
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*/
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/* About the global_state_lock
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Each state transition on an device holds a read lock. In case we have
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to evaluate the sync after dependencies, we grab a write lock, because
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we need stable states on all devices for that. */
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rwlock_t global_state_lock;
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/* used for synchronous meta data and bitmap IO
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* submitted by drbd_md_sync_page_io()
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*/
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void drbd_md_io_complete(struct bio *bio, int error)
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{
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struct drbd_md_io *md_io;
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md_io = (struct drbd_md_io *)bio->bi_private;
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md_io->error = error;
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complete(&md_io->event);
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}
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/* reads on behalf of the partner,
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* "submitted" by the receiver
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*/
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void drbd_endio_read_sec(struct bio *bio, int error) __releases(local)
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{
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unsigned long flags = 0;
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struct drbd_epoch_entry *e = NULL;
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struct drbd_conf *mdev;
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int uptodate = bio_flagged(bio, BIO_UPTODATE);
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e = bio->bi_private;
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mdev = e->mdev;
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if (error)
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dev_warn(DEV, "read: error=%d s=%llus\n", error,
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(unsigned long long)e->sector);
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if (!error && !uptodate) {
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dev_warn(DEV, "read: setting error to -EIO s=%llus\n",
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(unsigned long long)e->sector);
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/* strange behavior of some lower level drivers...
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* fail the request by clearing the uptodate flag,
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* but do not return any error?! */
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error = -EIO;
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}
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D_ASSERT(e->block_id != ID_VACANT);
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spin_lock_irqsave(&mdev->req_lock, flags);
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mdev->read_cnt += e->size >> 9;
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list_del(&e->w.list);
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if (list_empty(&mdev->read_ee))
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wake_up(&mdev->ee_wait);
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spin_unlock_irqrestore(&mdev->req_lock, flags);
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drbd_chk_io_error(mdev, error, FALSE);
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drbd_queue_work(&mdev->data.work, &e->w);
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put_ldev(mdev);
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}
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/* writes on behalf of the partner, or resync writes,
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* "submitted" by the receiver.
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*/
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void drbd_endio_write_sec(struct bio *bio, int error) __releases(local)
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{
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unsigned long flags = 0;
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struct drbd_epoch_entry *e = NULL;
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struct drbd_conf *mdev;
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sector_t e_sector;
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int do_wake;
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int is_syncer_req;
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int do_al_complete_io;
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int uptodate = bio_flagged(bio, BIO_UPTODATE);
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int is_barrier = bio_rw_flagged(bio, BIO_RW_BARRIER);
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e = bio->bi_private;
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mdev = e->mdev;
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if (error)
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dev_warn(DEV, "write: error=%d s=%llus\n", error,
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(unsigned long long)e->sector);
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if (!error && !uptodate) {
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dev_warn(DEV, "write: setting error to -EIO s=%llus\n",
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(unsigned long long)e->sector);
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/* strange behavior of some lower level drivers...
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* fail the request by clearing the uptodate flag,
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* but do not return any error?! */
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error = -EIO;
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}
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/* error == -ENOTSUPP would be a better test,
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* alas it is not reliable */
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if (error && is_barrier && e->flags & EE_IS_BARRIER) {
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drbd_bump_write_ordering(mdev, WO_bdev_flush);
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spin_lock_irqsave(&mdev->req_lock, flags);
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list_del(&e->w.list);
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e->w.cb = w_e_reissue;
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/* put_ldev actually happens below, once we come here again. */
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__release(local);
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spin_unlock_irqrestore(&mdev->req_lock, flags);
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drbd_queue_work(&mdev->data.work, &e->w);
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return;
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}
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D_ASSERT(e->block_id != ID_VACANT);
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spin_lock_irqsave(&mdev->req_lock, flags);
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mdev->writ_cnt += e->size >> 9;
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is_syncer_req = is_syncer_block_id(e->block_id);
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/* after we moved e to done_ee,
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* we may no longer access it,
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* it may be freed/reused already!
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* (as soon as we release the req_lock) */
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e_sector = e->sector;
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do_al_complete_io = e->flags & EE_CALL_AL_COMPLETE_IO;
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list_del(&e->w.list); /* has been on active_ee or sync_ee */
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list_add_tail(&e->w.list, &mdev->done_ee);
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/* No hlist_del_init(&e->colision) here, we did not send the Ack yet,
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* neither did we wake possibly waiting conflicting requests.
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* done from "drbd_process_done_ee" within the appropriate w.cb
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* (e_end_block/e_end_resync_block) or from _drbd_clear_done_ee */
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do_wake = is_syncer_req
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? list_empty(&mdev->sync_ee)
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: list_empty(&mdev->active_ee);
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if (error)
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__drbd_chk_io_error(mdev, FALSE);
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spin_unlock_irqrestore(&mdev->req_lock, flags);
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if (is_syncer_req)
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drbd_rs_complete_io(mdev, e_sector);
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if (do_wake)
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wake_up(&mdev->ee_wait);
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if (do_al_complete_io)
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drbd_al_complete_io(mdev, e_sector);
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wake_asender(mdev);
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put_ldev(mdev);
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}
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/* read, readA or write requests on R_PRIMARY coming from drbd_make_request
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*/
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void drbd_endio_pri(struct bio *bio, int error)
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{
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unsigned long flags;
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struct drbd_request *req = bio->bi_private;
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struct drbd_conf *mdev = req->mdev;
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struct bio_and_error m;
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enum drbd_req_event what;
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int uptodate = bio_flagged(bio, BIO_UPTODATE);
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if (error)
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dev_warn(DEV, "p %s: error=%d\n",
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bio_data_dir(bio) == WRITE ? "write" : "read", error);
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if (!error && !uptodate) {
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dev_warn(DEV, "p %s: setting error to -EIO\n",
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bio_data_dir(bio) == WRITE ? "write" : "read");
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/* strange behavior of some lower level drivers...
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* fail the request by clearing the uptodate flag,
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* but do not return any error?! */
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error = -EIO;
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}
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/* to avoid recursion in __req_mod */
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if (unlikely(error)) {
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what = (bio_data_dir(bio) == WRITE)
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? write_completed_with_error
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: (bio_rw(bio) == READA)
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? read_completed_with_error
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: read_ahead_completed_with_error;
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} else
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what = completed_ok;
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bio_put(req->private_bio);
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req->private_bio = ERR_PTR(error);
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spin_lock_irqsave(&mdev->req_lock, flags);
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__req_mod(req, what, &m);
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spin_unlock_irqrestore(&mdev->req_lock, flags);
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if (m.bio)
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complete_master_bio(mdev, &m);
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}
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int w_io_error(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
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{
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struct drbd_request *req = container_of(w, struct drbd_request, w);
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/* NOTE: mdev->ldev can be NULL by the time we get here! */
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/* D_ASSERT(mdev->ldev->dc.on_io_error != EP_PASS_ON); */
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/* the only way this callback is scheduled is from _req_may_be_done,
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* when it is done and had a local write error, see comments there */
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drbd_req_free(req);
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return TRUE;
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}
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int w_read_retry_remote(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
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{
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struct drbd_request *req = container_of(w, struct drbd_request, w);
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/* We should not detach for read io-error,
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* but try to WRITE the P_DATA_REPLY to the failed location,
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* to give the disk the chance to relocate that block */
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spin_lock_irq(&mdev->req_lock);
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if (cancel ||
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mdev->state.conn < C_CONNECTED ||
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mdev->state.pdsk <= D_INCONSISTENT) {
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_req_mod(req, send_canceled);
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spin_unlock_irq(&mdev->req_lock);
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dev_alert(DEV, "WE ARE LOST. Local IO failure, no peer.\n");
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return 1;
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}
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spin_unlock_irq(&mdev->req_lock);
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return w_send_read_req(mdev, w, 0);
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}
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int w_resync_inactive(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
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{
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ERR_IF(cancel) return 1;
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dev_err(DEV, "resync inactive, but callback triggered??\n");
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return 1; /* Simply ignore this! */
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}
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void drbd_csum(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest)
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{
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struct hash_desc desc;
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struct scatterlist sg;
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struct bio_vec *bvec;
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int i;
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desc.tfm = tfm;
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desc.flags = 0;
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sg_init_table(&sg, 1);
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crypto_hash_init(&desc);
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__bio_for_each_segment(bvec, bio, i, 0) {
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sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset);
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crypto_hash_update(&desc, &sg, sg.length);
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}
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crypto_hash_final(&desc, digest);
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}
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static int w_e_send_csum(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
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{
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struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w);
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int digest_size;
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void *digest;
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int ok;
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D_ASSERT(e->block_id == DRBD_MAGIC + 0xbeef);
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if (unlikely(cancel)) {
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drbd_free_ee(mdev, e);
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return 1;
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}
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if (likely(drbd_bio_uptodate(e->private_bio))) {
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digest_size = crypto_hash_digestsize(mdev->csums_tfm);
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digest = kmalloc(digest_size, GFP_NOIO);
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if (digest) {
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drbd_csum(mdev, mdev->csums_tfm, e->private_bio, digest);
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inc_rs_pending(mdev);
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ok = drbd_send_drequest_csum(mdev,
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e->sector,
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e->size,
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digest,
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digest_size,
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P_CSUM_RS_REQUEST);
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kfree(digest);
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} else {
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dev_err(DEV, "kmalloc() of digest failed.\n");
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ok = 0;
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}
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} else
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ok = 1;
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drbd_free_ee(mdev, e);
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if (unlikely(!ok))
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dev_err(DEV, "drbd_send_drequest(..., csum) failed\n");
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return ok;
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}
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#define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
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static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size)
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{
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struct drbd_epoch_entry *e;
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if (!get_ldev(mdev))
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return 0;
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/* GFP_TRY, because if there is no memory available right now, this may
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* be rescheduled for later. It is "only" background resync, after all. */
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e = drbd_alloc_ee(mdev, DRBD_MAGIC+0xbeef, sector, size, GFP_TRY);
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if (!e) {
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put_ldev(mdev);
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return 2;
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}
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spin_lock_irq(&mdev->req_lock);
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list_add(&e->w.list, &mdev->read_ee);
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spin_unlock_irq(&mdev->req_lock);
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e->private_bio->bi_end_io = drbd_endio_read_sec;
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e->private_bio->bi_rw = READ;
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e->w.cb = w_e_send_csum;
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mdev->read_cnt += size >> 9;
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drbd_generic_make_request(mdev, DRBD_FAULT_RS_RD, e->private_bio);
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return 1;
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}
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void resync_timer_fn(unsigned long data)
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{
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unsigned long flags;
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struct drbd_conf *mdev = (struct drbd_conf *) data;
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int queue;
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spin_lock_irqsave(&mdev->req_lock, flags);
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if (likely(!test_and_clear_bit(STOP_SYNC_TIMER, &mdev->flags))) {
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queue = 1;
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if (mdev->state.conn == C_VERIFY_S)
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mdev->resync_work.cb = w_make_ov_request;
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else
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mdev->resync_work.cb = w_make_resync_request;
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} else {
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queue = 0;
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mdev->resync_work.cb = w_resync_inactive;
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}
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spin_unlock_irqrestore(&mdev->req_lock, flags);
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/* harmless race: list_empty outside data.work.q_lock */
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if (list_empty(&mdev->resync_work.list) && queue)
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drbd_queue_work(&mdev->data.work, &mdev->resync_work);
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}
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int w_make_resync_request(struct drbd_conf *mdev,
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struct drbd_work *w, int cancel)
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{
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unsigned long bit;
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sector_t sector;
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const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
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int max_segment_size = queue_max_segment_size(mdev->rq_queue);
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int number, i, size, pe, mx;
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int align, queued, sndbuf;
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if (unlikely(cancel))
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return 1;
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if (unlikely(mdev->state.conn < C_CONNECTED)) {
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dev_err(DEV, "Confused in w_make_resync_request()! cstate < Connected");
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return 0;
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}
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if (mdev->state.conn != C_SYNC_TARGET)
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dev_err(DEV, "%s in w_make_resync_request\n",
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drbd_conn_str(mdev->state.conn));
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if (!get_ldev(mdev)) {
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/* Since we only need to access mdev->rsync a
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get_ldev_if_state(mdev,D_FAILED) would be sufficient, but
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to continue resync with a broken disk makes no sense at
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all */
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dev_err(DEV, "Disk broke down during resync!\n");
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mdev->resync_work.cb = w_resync_inactive;
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return 1;
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}
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number = SLEEP_TIME * mdev->sync_conf.rate / ((BM_BLOCK_SIZE/1024)*HZ);
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pe = atomic_read(&mdev->rs_pending_cnt);
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mutex_lock(&mdev->data.mutex);
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if (mdev->data.socket)
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mx = mdev->data.socket->sk->sk_rcvbuf / sizeof(struct p_block_req);
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else
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mx = 1;
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mutex_unlock(&mdev->data.mutex);
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/* For resync rates >160MB/sec, allow more pending RS requests */
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if (number > mx)
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mx = number;
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/* Limit the number of pending RS requests to no more than the peer's receive buffer */
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if ((pe + number) > mx) {
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number = mx - pe;
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}
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for (i = 0; i < number; i++) {
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/* Stop generating RS requests, when half of the send buffer is filled */
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mutex_lock(&mdev->data.mutex);
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if (mdev->data.socket) {
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queued = mdev->data.socket->sk->sk_wmem_queued;
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sndbuf = mdev->data.socket->sk->sk_sndbuf;
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} else {
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queued = 1;
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sndbuf = 0;
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}
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mutex_unlock(&mdev->data.mutex);
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if (queued > sndbuf / 2)
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goto requeue;
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|
|
next_sector:
|
|
size = BM_BLOCK_SIZE;
|
|
bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo);
|
|
|
|
if (bit == -1UL) {
|
|
mdev->bm_resync_fo = drbd_bm_bits(mdev);
|
|
mdev->resync_work.cb = w_resync_inactive;
|
|
put_ldev(mdev);
|
|
return 1;
|
|
}
|
|
|
|
sector = BM_BIT_TO_SECT(bit);
|
|
|
|
if (drbd_try_rs_begin_io(mdev, sector)) {
|
|
mdev->bm_resync_fo = bit;
|
|
goto requeue;
|
|
}
|
|
mdev->bm_resync_fo = bit + 1;
|
|
|
|
if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) {
|
|
drbd_rs_complete_io(mdev, sector);
|
|
goto next_sector;
|
|
}
|
|
|
|
#if DRBD_MAX_SEGMENT_SIZE > BM_BLOCK_SIZE
|
|
/* try to find some adjacent bits.
|
|
* we stop if we have already the maximum req size.
|
|
*
|
|
* Additionally always align bigger requests, in order to
|
|
* be prepared for all stripe sizes of software RAIDs.
|
|
*
|
|
* we _do_ care about the agreed-upon q->max_segment_size
|
|
* here, as splitting up the requests on the other side is more
|
|
* difficult. the consequence is, that on lvm and md and other
|
|
* "indirect" devices, this is dead code, since
|
|
* q->max_segment_size will be PAGE_SIZE.
|
|
*/
|
|
align = 1;
|
|
for (;;) {
|
|
if (size + BM_BLOCK_SIZE > max_segment_size)
|
|
break;
|
|
|
|
/* Be always aligned */
|
|
if (sector & ((1<<(align+3))-1))
|
|
break;
|
|
|
|
/* do not cross extent boundaries */
|
|
if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0)
|
|
break;
|
|
/* now, is it actually dirty, after all?
|
|
* caution, drbd_bm_test_bit is tri-state for some
|
|
* obscure reason; ( b == 0 ) would get the out-of-band
|
|
* only accidentally right because of the "oddly sized"
|
|
* adjustment below */
|
|
if (drbd_bm_test_bit(mdev, bit+1) != 1)
|
|
break;
|
|
bit++;
|
|
size += BM_BLOCK_SIZE;
|
|
if ((BM_BLOCK_SIZE << align) <= size)
|
|
align++;
|
|
i++;
|
|
}
|
|
/* if we merged some,
|
|
* reset the offset to start the next drbd_bm_find_next from */
|
|
if (size > BM_BLOCK_SIZE)
|
|
mdev->bm_resync_fo = bit + 1;
|
|
#endif
|
|
|
|
/* adjust very last sectors, in case we are oddly sized */
|
|
if (sector + (size>>9) > capacity)
|
|
size = (capacity-sector)<<9;
|
|
if (mdev->agreed_pro_version >= 89 && mdev->csums_tfm) {
|
|
switch (read_for_csum(mdev, sector, size)) {
|
|
case 0: /* Disk failure*/
|
|
put_ldev(mdev);
|
|
return 0;
|
|
case 2: /* Allocation failed */
|
|
drbd_rs_complete_io(mdev, sector);
|
|
mdev->bm_resync_fo = BM_SECT_TO_BIT(sector);
|
|
goto requeue;
|
|
/* case 1: everything ok */
|
|
}
|
|
} else {
|
|
inc_rs_pending(mdev);
|
|
if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST,
|
|
sector, size, ID_SYNCER)) {
|
|
dev_err(DEV, "drbd_send_drequest() failed, aborting...\n");
|
|
dec_rs_pending(mdev);
|
|
put_ldev(mdev);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) {
|
|
/* last syncer _request_ was sent,
|
|
* but the P_RS_DATA_REPLY not yet received. sync will end (and
|
|
* next sync group will resume), as soon as we receive the last
|
|
* resync data block, and the last bit is cleared.
|
|
* until then resync "work" is "inactive" ...
|
|
*/
|
|
mdev->resync_work.cb = w_resync_inactive;
|
|
put_ldev(mdev);
|
|
return 1;
|
|
}
|
|
|
|
requeue:
|
|
mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME);
|
|
put_ldev(mdev);
|
|
return 1;
|
|
}
|
|
|
|
static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
int number, i, size;
|
|
sector_t sector;
|
|
const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
|
|
|
|
if (unlikely(cancel))
|
|
return 1;
|
|
|
|
if (unlikely(mdev->state.conn < C_CONNECTED)) {
|
|
dev_err(DEV, "Confused in w_make_ov_request()! cstate < Connected");
|
|
return 0;
|
|
}
|
|
|
|
number = SLEEP_TIME*mdev->sync_conf.rate / ((BM_BLOCK_SIZE/1024)*HZ);
|
|
if (atomic_read(&mdev->rs_pending_cnt) > number)
|
|
goto requeue;
|
|
|
|
number -= atomic_read(&mdev->rs_pending_cnt);
|
|
|
|
sector = mdev->ov_position;
|
|
for (i = 0; i < number; i++) {
|
|
if (sector >= capacity) {
|
|
mdev->resync_work.cb = w_resync_inactive;
|
|
return 1;
|
|
}
|
|
|
|
size = BM_BLOCK_SIZE;
|
|
|
|
if (drbd_try_rs_begin_io(mdev, sector)) {
|
|
mdev->ov_position = sector;
|
|
goto requeue;
|
|
}
|
|
|
|
if (sector + (size>>9) > capacity)
|
|
size = (capacity-sector)<<9;
|
|
|
|
inc_rs_pending(mdev);
|
|
if (!drbd_send_ov_request(mdev, sector, size)) {
|
|
dec_rs_pending(mdev);
|
|
return 0;
|
|
}
|
|
sector += BM_SECT_PER_BIT;
|
|
}
|
|
mdev->ov_position = sector;
|
|
|
|
requeue:
|
|
mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME);
|
|
return 1;
|
|
}
|
|
|
|
|
|
int w_ov_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
kfree(w);
|
|
ov_oos_print(mdev);
|
|
drbd_resync_finished(mdev);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int w_resync_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
kfree(w);
|
|
|
|
drbd_resync_finished(mdev);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int drbd_resync_finished(struct drbd_conf *mdev)
|
|
{
|
|
unsigned long db, dt, dbdt;
|
|
unsigned long n_oos;
|
|
union drbd_state os, ns;
|
|
struct drbd_work *w;
|
|
char *khelper_cmd = NULL;
|
|
|
|
/* Remove all elements from the resync LRU. Since future actions
|
|
* might set bits in the (main) bitmap, then the entries in the
|
|
* resync LRU would be wrong. */
|
|
if (drbd_rs_del_all(mdev)) {
|
|
/* In case this is not possible now, most probably because
|
|
* there are P_RS_DATA_REPLY Packets lingering on the worker's
|
|
* queue (or even the read operations for those packets
|
|
* is not finished by now). Retry in 100ms. */
|
|
|
|
drbd_kick_lo(mdev);
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(HZ / 10);
|
|
w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC);
|
|
if (w) {
|
|
w->cb = w_resync_finished;
|
|
drbd_queue_work(&mdev->data.work, w);
|
|
return 1;
|
|
}
|
|
dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n");
|
|
}
|
|
|
|
dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ;
|
|
if (dt <= 0)
|
|
dt = 1;
|
|
db = mdev->rs_total;
|
|
dbdt = Bit2KB(db/dt);
|
|
mdev->rs_paused /= HZ;
|
|
|
|
if (!get_ldev(mdev))
|
|
goto out;
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
os = mdev->state;
|
|
|
|
/* This protects us against multiple calls (that can happen in the presence
|
|
of application IO), and against connectivity loss just before we arrive here. */
|
|
if (os.conn <= C_CONNECTED)
|
|
goto out_unlock;
|
|
|
|
ns = os;
|
|
ns.conn = C_CONNECTED;
|
|
|
|
dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n",
|
|
(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) ?
|
|
"Online verify " : "Resync",
|
|
dt + mdev->rs_paused, mdev->rs_paused, dbdt);
|
|
|
|
n_oos = drbd_bm_total_weight(mdev);
|
|
|
|
if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) {
|
|
if (n_oos) {
|
|
dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n",
|
|
n_oos, Bit2KB(1));
|
|
khelper_cmd = "out-of-sync";
|
|
}
|
|
} else {
|
|
D_ASSERT((n_oos - mdev->rs_failed) == 0);
|
|
|
|
if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T)
|
|
khelper_cmd = "after-resync-target";
|
|
|
|
if (mdev->csums_tfm && mdev->rs_total) {
|
|
const unsigned long s = mdev->rs_same_csum;
|
|
const unsigned long t = mdev->rs_total;
|
|
const int ratio =
|
|
(t == 0) ? 0 :
|
|
(t < 100000) ? ((s*100)/t) : (s/(t/100));
|
|
dev_info(DEV, "%u %% had equal check sums, eliminated: %luK; "
|
|
"transferred %luK total %luK\n",
|
|
ratio,
|
|
Bit2KB(mdev->rs_same_csum),
|
|
Bit2KB(mdev->rs_total - mdev->rs_same_csum),
|
|
Bit2KB(mdev->rs_total));
|
|
}
|
|
}
|
|
|
|
if (mdev->rs_failed) {
|
|
dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed);
|
|
|
|
if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) {
|
|
ns.disk = D_INCONSISTENT;
|
|
ns.pdsk = D_UP_TO_DATE;
|
|
} else {
|
|
ns.disk = D_UP_TO_DATE;
|
|
ns.pdsk = D_INCONSISTENT;
|
|
}
|
|
} else {
|
|
ns.disk = D_UP_TO_DATE;
|
|
ns.pdsk = D_UP_TO_DATE;
|
|
|
|
if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) {
|
|
if (mdev->p_uuid) {
|
|
int i;
|
|
for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++)
|
|
_drbd_uuid_set(mdev, i, mdev->p_uuid[i]);
|
|
drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]);
|
|
_drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]);
|
|
} else {
|
|
dev_err(DEV, "mdev->p_uuid is NULL! BUG\n");
|
|
}
|
|
}
|
|
|
|
drbd_uuid_set_bm(mdev, 0UL);
|
|
|
|
if (mdev->p_uuid) {
|
|
/* Now the two UUID sets are equal, update what we
|
|
* know of the peer. */
|
|
int i;
|
|
for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++)
|
|
mdev->p_uuid[i] = mdev->ldev->md.uuid[i];
|
|
}
|
|
}
|
|
|
|
_drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
|
|
out_unlock:
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
put_ldev(mdev);
|
|
out:
|
|
mdev->rs_total = 0;
|
|
mdev->rs_failed = 0;
|
|
mdev->rs_paused = 0;
|
|
mdev->ov_start_sector = 0;
|
|
|
|
if (test_and_clear_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags)) {
|
|
dev_warn(DEV, "Writing the whole bitmap, due to failed kmalloc\n");
|
|
drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished");
|
|
}
|
|
|
|
if (khelper_cmd)
|
|
drbd_khelper(mdev, khelper_cmd);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* helper */
|
|
static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
|
|
{
|
|
if (drbd_bio_has_active_page(e->private_bio)) {
|
|
/* This might happen if sendpage() has not finished */
|
|
spin_lock_irq(&mdev->req_lock);
|
|
list_add_tail(&e->w.list, &mdev->net_ee);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
} else
|
|
drbd_free_ee(mdev, e);
|
|
}
|
|
|
|
/**
|
|
* w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST
|
|
* @mdev: DRBD device.
|
|
* @w: work object.
|
|
* @cancel: The connection will be closed anyways
|
|
*/
|
|
int w_e_end_data_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w);
|
|
int ok;
|
|
|
|
if (unlikely(cancel)) {
|
|
drbd_free_ee(mdev, e);
|
|
dec_unacked(mdev);
|
|
return 1;
|
|
}
|
|
|
|
if (likely(drbd_bio_uptodate(e->private_bio))) {
|
|
ok = drbd_send_block(mdev, P_DATA_REPLY, e);
|
|
} else {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Sending NegDReply. sector=%llus.\n",
|
|
(unsigned long long)e->sector);
|
|
|
|
ok = drbd_send_ack(mdev, P_NEG_DREPLY, e);
|
|
}
|
|
|
|
dec_unacked(mdev);
|
|
|
|
move_to_net_ee_or_free(mdev, e);
|
|
|
|
if (unlikely(!ok))
|
|
dev_err(DEV, "drbd_send_block() failed\n");
|
|
return ok;
|
|
}
|
|
|
|
/**
|
|
* w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS
|
|
* @mdev: DRBD device.
|
|
* @w: work object.
|
|
* @cancel: The connection will be closed anyways
|
|
*/
|
|
int w_e_end_rsdata_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w);
|
|
int ok;
|
|
|
|
if (unlikely(cancel)) {
|
|
drbd_free_ee(mdev, e);
|
|
dec_unacked(mdev);
|
|
return 1;
|
|
}
|
|
|
|
if (get_ldev_if_state(mdev, D_FAILED)) {
|
|
drbd_rs_complete_io(mdev, e->sector);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
if (likely(drbd_bio_uptodate(e->private_bio))) {
|
|
if (likely(mdev->state.pdsk >= D_INCONSISTENT)) {
|
|
inc_rs_pending(mdev);
|
|
ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e);
|
|
} else {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Not sending RSDataReply, "
|
|
"partner DISKLESS!\n");
|
|
ok = 1;
|
|
}
|
|
} else {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Sending NegRSDReply. sector %llus.\n",
|
|
(unsigned long long)e->sector);
|
|
|
|
ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e);
|
|
|
|
/* update resync data with failure */
|
|
drbd_rs_failed_io(mdev, e->sector, e->size);
|
|
}
|
|
|
|
dec_unacked(mdev);
|
|
|
|
move_to_net_ee_or_free(mdev, e);
|
|
|
|
if (unlikely(!ok))
|
|
dev_err(DEV, "drbd_send_block() failed\n");
|
|
return ok;
|
|
}
|
|
|
|
int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w);
|
|
struct digest_info *di;
|
|
int digest_size;
|
|
void *digest = NULL;
|
|
int ok, eq = 0;
|
|
|
|
if (unlikely(cancel)) {
|
|
drbd_free_ee(mdev, e);
|
|
dec_unacked(mdev);
|
|
return 1;
|
|
}
|
|
|
|
drbd_rs_complete_io(mdev, e->sector);
|
|
|
|
di = (struct digest_info *)(unsigned long)e->block_id;
|
|
|
|
if (likely(drbd_bio_uptodate(e->private_bio))) {
|
|
/* quick hack to try to avoid a race against reconfiguration.
|
|
* a real fix would be much more involved,
|
|
* introducing more locking mechanisms */
|
|
if (mdev->csums_tfm) {
|
|
digest_size = crypto_hash_digestsize(mdev->csums_tfm);
|
|
D_ASSERT(digest_size == di->digest_size);
|
|
digest = kmalloc(digest_size, GFP_NOIO);
|
|
}
|
|
if (digest) {
|
|
drbd_csum(mdev, mdev->csums_tfm, e->private_bio, digest);
|
|
eq = !memcmp(digest, di->digest, digest_size);
|
|
kfree(digest);
|
|
}
|
|
|
|
if (eq) {
|
|
drbd_set_in_sync(mdev, e->sector, e->size);
|
|
mdev->rs_same_csum++;
|
|
ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, e);
|
|
} else {
|
|
inc_rs_pending(mdev);
|
|
e->block_id = ID_SYNCER;
|
|
ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e);
|
|
}
|
|
} else {
|
|
ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e);
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n");
|
|
}
|
|
|
|
dec_unacked(mdev);
|
|
|
|
kfree(di);
|
|
|
|
move_to_net_ee_or_free(mdev, e);
|
|
|
|
if (unlikely(!ok))
|
|
dev_err(DEV, "drbd_send_block/ack() failed\n");
|
|
return ok;
|
|
}
|
|
|
|
int w_e_end_ov_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w);
|
|
int digest_size;
|
|
void *digest;
|
|
int ok = 1;
|
|
|
|
if (unlikely(cancel))
|
|
goto out;
|
|
|
|
if (unlikely(!drbd_bio_uptodate(e->private_bio)))
|
|
goto out;
|
|
|
|
digest_size = crypto_hash_digestsize(mdev->verify_tfm);
|
|
/* FIXME if this allocation fails, online verify will not terminate! */
|
|
digest = kmalloc(digest_size, GFP_NOIO);
|
|
if (digest) {
|
|
drbd_csum(mdev, mdev->verify_tfm, e->private_bio, digest);
|
|
inc_rs_pending(mdev);
|
|
ok = drbd_send_drequest_csum(mdev, e->sector, e->size,
|
|
digest, digest_size, P_OV_REPLY);
|
|
if (!ok)
|
|
dec_rs_pending(mdev);
|
|
kfree(digest);
|
|
}
|
|
|
|
out:
|
|
drbd_free_ee(mdev, e);
|
|
|
|
dec_unacked(mdev);
|
|
|
|
return ok;
|
|
}
|
|
|
|
void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size)
|
|
{
|
|
if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) {
|
|
mdev->ov_last_oos_size += size>>9;
|
|
} else {
|
|
mdev->ov_last_oos_start = sector;
|
|
mdev->ov_last_oos_size = size>>9;
|
|
}
|
|
drbd_set_out_of_sync(mdev, sector, size);
|
|
set_bit(WRITE_BM_AFTER_RESYNC, &mdev->flags);
|
|
}
|
|
|
|
int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w);
|
|
struct digest_info *di;
|
|
int digest_size;
|
|
void *digest;
|
|
int ok, eq = 0;
|
|
|
|
if (unlikely(cancel)) {
|
|
drbd_free_ee(mdev, e);
|
|
dec_unacked(mdev);
|
|
return 1;
|
|
}
|
|
|
|
/* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all
|
|
* the resync lru has been cleaned up already */
|
|
drbd_rs_complete_io(mdev, e->sector);
|
|
|
|
di = (struct digest_info *)(unsigned long)e->block_id;
|
|
|
|
if (likely(drbd_bio_uptodate(e->private_bio))) {
|
|
digest_size = crypto_hash_digestsize(mdev->verify_tfm);
|
|
digest = kmalloc(digest_size, GFP_NOIO);
|
|
if (digest) {
|
|
drbd_csum(mdev, mdev->verify_tfm, e->private_bio, digest);
|
|
|
|
D_ASSERT(digest_size == di->digest_size);
|
|
eq = !memcmp(digest, di->digest, digest_size);
|
|
kfree(digest);
|
|
}
|
|
} else {
|
|
ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e);
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n");
|
|
}
|
|
|
|
dec_unacked(mdev);
|
|
|
|
kfree(di);
|
|
|
|
if (!eq)
|
|
drbd_ov_oos_found(mdev, e->sector, e->size);
|
|
else
|
|
ov_oos_print(mdev);
|
|
|
|
ok = drbd_send_ack_ex(mdev, P_OV_RESULT, e->sector, e->size,
|
|
eq ? ID_IN_SYNC : ID_OUT_OF_SYNC);
|
|
|
|
drbd_free_ee(mdev, e);
|
|
|
|
if (--mdev->ov_left == 0) {
|
|
ov_oos_print(mdev);
|
|
drbd_resync_finished(mdev);
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
int w_prev_work_done(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w);
|
|
complete(&b->done);
|
|
return 1;
|
|
}
|
|
|
|
int w_send_barrier(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w);
|
|
struct p_barrier *p = &mdev->data.sbuf.barrier;
|
|
int ok = 1;
|
|
|
|
/* really avoid racing with tl_clear. w.cb may have been referenced
|
|
* just before it was reassigned and re-queued, so double check that.
|
|
* actually, this race was harmless, since we only try to send the
|
|
* barrier packet here, and otherwise do nothing with the object.
|
|
* but compare with the head of w_clear_epoch */
|
|
spin_lock_irq(&mdev->req_lock);
|
|
if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED)
|
|
cancel = 1;
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
if (cancel)
|
|
return 1;
|
|
|
|
if (!drbd_get_data_sock(mdev))
|
|
return 0;
|
|
p->barrier = b->br_number;
|
|
/* inc_ap_pending was done where this was queued.
|
|
* dec_ap_pending will be done in got_BarrierAck
|
|
* or (on connection loss) in w_clear_epoch. */
|
|
ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BARRIER,
|
|
(struct p_header *)p, sizeof(*p), 0);
|
|
drbd_put_data_sock(mdev);
|
|
|
|
return ok;
|
|
}
|
|
|
|
int w_send_write_hint(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
if (cancel)
|
|
return 1;
|
|
return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE);
|
|
}
|
|
|
|
/**
|
|
* w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request
|
|
* @mdev: DRBD device.
|
|
* @w: work object.
|
|
* @cancel: The connection will be closed anyways
|
|
*/
|
|
int w_send_dblock(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_request *req = container_of(w, struct drbd_request, w);
|
|
int ok;
|
|
|
|
if (unlikely(cancel)) {
|
|
req_mod(req, send_canceled);
|
|
return 1;
|
|
}
|
|
|
|
ok = drbd_send_dblock(mdev, req);
|
|
req_mod(req, ok ? handed_over_to_network : send_failed);
|
|
|
|
return ok;
|
|
}
|
|
|
|
/**
|
|
* w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet
|
|
* @mdev: DRBD device.
|
|
* @w: work object.
|
|
* @cancel: The connection will be closed anyways
|
|
*/
|
|
int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_request *req = container_of(w, struct drbd_request, w);
|
|
int ok;
|
|
|
|
if (unlikely(cancel)) {
|
|
req_mod(req, send_canceled);
|
|
return 1;
|
|
}
|
|
|
|
ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->sector, req->size,
|
|
(unsigned long)req);
|
|
|
|
if (!ok) {
|
|
/* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send();
|
|
* so this is probably redundant */
|
|
if (mdev->state.conn >= C_CONNECTED)
|
|
drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE));
|
|
}
|
|
req_mod(req, ok ? handed_over_to_network : send_failed);
|
|
|
|
return ok;
|
|
}
|
|
|
|
static int _drbd_may_sync_now(struct drbd_conf *mdev)
|
|
{
|
|
struct drbd_conf *odev = mdev;
|
|
|
|
while (1) {
|
|
if (odev->sync_conf.after == -1)
|
|
return 1;
|
|
odev = minor_to_mdev(odev->sync_conf.after);
|
|
ERR_IF(!odev) return 1;
|
|
if ((odev->state.conn >= C_SYNC_SOURCE &&
|
|
odev->state.conn <= C_PAUSED_SYNC_T) ||
|
|
odev->state.aftr_isp || odev->state.peer_isp ||
|
|
odev->state.user_isp)
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* _drbd_pause_after() - Pause resync on all devices that may not resync now
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Called from process context only (admin command and after_state_ch).
|
|
*/
|
|
static int _drbd_pause_after(struct drbd_conf *mdev)
|
|
{
|
|
struct drbd_conf *odev;
|
|
int i, rv = 0;
|
|
|
|
for (i = 0; i < minor_count; i++) {
|
|
odev = minor_to_mdev(i);
|
|
if (!odev)
|
|
continue;
|
|
if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS)
|
|
continue;
|
|
if (!_drbd_may_sync_now(odev))
|
|
rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL)
|
|
!= SS_NOTHING_TO_DO);
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* _drbd_resume_next() - Resume resync on all devices that may resync now
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Called from process context only (admin command and worker).
|
|
*/
|
|
static int _drbd_resume_next(struct drbd_conf *mdev)
|
|
{
|
|
struct drbd_conf *odev;
|
|
int i, rv = 0;
|
|
|
|
for (i = 0; i < minor_count; i++) {
|
|
odev = minor_to_mdev(i);
|
|
if (!odev)
|
|
continue;
|
|
if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS)
|
|
continue;
|
|
if (odev->state.aftr_isp) {
|
|
if (_drbd_may_sync_now(odev))
|
|
rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0),
|
|
CS_HARD, NULL)
|
|
!= SS_NOTHING_TO_DO) ;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
void resume_next_sg(struct drbd_conf *mdev)
|
|
{
|
|
write_lock_irq(&global_state_lock);
|
|
_drbd_resume_next(mdev);
|
|
write_unlock_irq(&global_state_lock);
|
|
}
|
|
|
|
void suspend_other_sg(struct drbd_conf *mdev)
|
|
{
|
|
write_lock_irq(&global_state_lock);
|
|
_drbd_pause_after(mdev);
|
|
write_unlock_irq(&global_state_lock);
|
|
}
|
|
|
|
static int sync_after_error(struct drbd_conf *mdev, int o_minor)
|
|
{
|
|
struct drbd_conf *odev;
|
|
|
|
if (o_minor == -1)
|
|
return NO_ERROR;
|
|
if (o_minor < -1 || minor_to_mdev(o_minor) == NULL)
|
|
return ERR_SYNC_AFTER;
|
|
|
|
/* check for loops */
|
|
odev = minor_to_mdev(o_minor);
|
|
while (1) {
|
|
if (odev == mdev)
|
|
return ERR_SYNC_AFTER_CYCLE;
|
|
|
|
/* dependency chain ends here, no cycles. */
|
|
if (odev->sync_conf.after == -1)
|
|
return NO_ERROR;
|
|
|
|
/* follow the dependency chain */
|
|
odev = minor_to_mdev(odev->sync_conf.after);
|
|
}
|
|
}
|
|
|
|
int drbd_alter_sa(struct drbd_conf *mdev, int na)
|
|
{
|
|
int changes;
|
|
int retcode;
|
|
|
|
write_lock_irq(&global_state_lock);
|
|
retcode = sync_after_error(mdev, na);
|
|
if (retcode == NO_ERROR) {
|
|
mdev->sync_conf.after = na;
|
|
do {
|
|
changes = _drbd_pause_after(mdev);
|
|
changes |= _drbd_resume_next(mdev);
|
|
} while (changes);
|
|
}
|
|
write_unlock_irq(&global_state_lock);
|
|
return retcode;
|
|
}
|
|
|
|
/**
|
|
* drbd_start_resync() - Start the resync process
|
|
* @mdev: DRBD device.
|
|
* @side: Either C_SYNC_SOURCE or C_SYNC_TARGET
|
|
*
|
|
* This function might bring you directly into one of the
|
|
* C_PAUSED_SYNC_* states.
|
|
*/
|
|
void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
|
|
{
|
|
union drbd_state ns;
|
|
int r;
|
|
|
|
if (mdev->state.conn >= C_SYNC_SOURCE) {
|
|
dev_err(DEV, "Resync already running!\n");
|
|
return;
|
|
}
|
|
|
|
/* In case a previous resync run was aborted by an IO error/detach on the peer. */
|
|
drbd_rs_cancel_all(mdev);
|
|
|
|
if (side == C_SYNC_TARGET) {
|
|
/* Since application IO was locked out during C_WF_BITMAP_T and
|
|
C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET
|
|
we check that we might make the data inconsistent. */
|
|
r = drbd_khelper(mdev, "before-resync-target");
|
|
r = (r >> 8) & 0xff;
|
|
if (r > 0) {
|
|
dev_info(DEV, "before-resync-target handler returned %d, "
|
|
"dropping connection.\n", r);
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return;
|
|
}
|
|
}
|
|
|
|
drbd_state_lock(mdev);
|
|
|
|
if (!get_ldev_if_state(mdev, D_NEGOTIATING)) {
|
|
drbd_state_unlock(mdev);
|
|
return;
|
|
}
|
|
|
|
if (side == C_SYNC_TARGET) {
|
|
mdev->bm_resync_fo = 0;
|
|
} else /* side == C_SYNC_SOURCE */ {
|
|
u64 uuid;
|
|
|
|
get_random_bytes(&uuid, sizeof(u64));
|
|
drbd_uuid_set(mdev, UI_BITMAP, uuid);
|
|
drbd_send_sync_uuid(mdev, uuid);
|
|
|
|
D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
|
|
}
|
|
|
|
write_lock_irq(&global_state_lock);
|
|
ns = mdev->state;
|
|
|
|
ns.aftr_isp = !_drbd_may_sync_now(mdev);
|
|
|
|
ns.conn = side;
|
|
|
|
if (side == C_SYNC_TARGET)
|
|
ns.disk = D_INCONSISTENT;
|
|
else /* side == C_SYNC_SOURCE */
|
|
ns.pdsk = D_INCONSISTENT;
|
|
|
|
r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
|
|
ns = mdev->state;
|
|
|
|
if (ns.conn < C_CONNECTED)
|
|
r = SS_UNKNOWN_ERROR;
|
|
|
|
if (r == SS_SUCCESS) {
|
|
mdev->rs_total =
|
|
mdev->rs_mark_left = drbd_bm_total_weight(mdev);
|
|
mdev->rs_failed = 0;
|
|
mdev->rs_paused = 0;
|
|
mdev->rs_start =
|
|
mdev->rs_mark_time = jiffies;
|
|
mdev->rs_same_csum = 0;
|
|
_drbd_pause_after(mdev);
|
|
}
|
|
write_unlock_irq(&global_state_lock);
|
|
drbd_state_unlock(mdev);
|
|
put_ldev(mdev);
|
|
|
|
if (r == SS_SUCCESS) {
|
|
dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n",
|
|
drbd_conn_str(ns.conn),
|
|
(unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10),
|
|
(unsigned long) mdev->rs_total);
|
|
|
|
if (mdev->rs_total == 0) {
|
|
/* Peer still reachable? Beware of failing before-resync-target handlers! */
|
|
request_ping(mdev);
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(mdev->net_conf->ping_timeo*HZ/9); /* 9 instead 10 */
|
|
drbd_resync_finished(mdev);
|
|
return;
|
|
}
|
|
|
|
/* ns.conn may already be != mdev->state.conn,
|
|
* we may have been paused in between, or become paused until
|
|
* the timer triggers.
|
|
* No matter, that is handled in resync_timer_fn() */
|
|
if (ns.conn == C_SYNC_TARGET)
|
|
mod_timer(&mdev->resync_timer, jiffies);
|
|
|
|
drbd_md_sync(mdev);
|
|
}
|
|
}
|
|
|
|
int drbd_worker(struct drbd_thread *thi)
|
|
{
|
|
struct drbd_conf *mdev = thi->mdev;
|
|
struct drbd_work *w = NULL;
|
|
LIST_HEAD(work_list);
|
|
int intr = 0, i;
|
|
|
|
sprintf(current->comm, "drbd%d_worker", mdev_to_minor(mdev));
|
|
|
|
while (get_t_state(thi) == Running) {
|
|
drbd_thread_current_set_cpu(mdev);
|
|
|
|
if (down_trylock(&mdev->data.work.s)) {
|
|
mutex_lock(&mdev->data.mutex);
|
|
if (mdev->data.socket && !mdev->net_conf->no_cork)
|
|
drbd_tcp_uncork(mdev->data.socket);
|
|
mutex_unlock(&mdev->data.mutex);
|
|
|
|
intr = down_interruptible(&mdev->data.work.s);
|
|
|
|
mutex_lock(&mdev->data.mutex);
|
|
if (mdev->data.socket && !mdev->net_conf->no_cork)
|
|
drbd_tcp_cork(mdev->data.socket);
|
|
mutex_unlock(&mdev->data.mutex);
|
|
}
|
|
|
|
if (intr) {
|
|
D_ASSERT(intr == -EINTR);
|
|
flush_signals(current);
|
|
ERR_IF (get_t_state(thi) == Running)
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
if (get_t_state(thi) != Running)
|
|
break;
|
|
/* With this break, we have done a down() but not consumed
|
|
the entry from the list. The cleanup code takes care of
|
|
this... */
|
|
|
|
w = NULL;
|
|
spin_lock_irq(&mdev->data.work.q_lock);
|
|
ERR_IF(list_empty(&mdev->data.work.q)) {
|
|
/* something terribly wrong in our logic.
|
|
* we were able to down() the semaphore,
|
|
* but the list is empty... doh.
|
|
*
|
|
* what is the best thing to do now?
|
|
* try again from scratch, restarting the receiver,
|
|
* asender, whatnot? could break even more ugly,
|
|
* e.g. when we are primary, but no good local data.
|
|
*
|
|
* I'll try to get away just starting over this loop.
|
|
*/
|
|
spin_unlock_irq(&mdev->data.work.q_lock);
|
|
continue;
|
|
}
|
|
w = list_entry(mdev->data.work.q.next, struct drbd_work, list);
|
|
list_del_init(&w->list);
|
|
spin_unlock_irq(&mdev->data.work.q_lock);
|
|
|
|
if (!w->cb(mdev, w, mdev->state.conn < C_CONNECTED)) {
|
|
/* dev_warn(DEV, "worker: a callback failed! \n"); */
|
|
if (mdev->state.conn >= C_CONNECTED)
|
|
drbd_force_state(mdev,
|
|
NS(conn, C_NETWORK_FAILURE));
|
|
}
|
|
}
|
|
D_ASSERT(test_bit(DEVICE_DYING, &mdev->flags));
|
|
D_ASSERT(test_bit(CONFIG_PENDING, &mdev->flags));
|
|
|
|
spin_lock_irq(&mdev->data.work.q_lock);
|
|
i = 0;
|
|
while (!list_empty(&mdev->data.work.q)) {
|
|
list_splice_init(&mdev->data.work.q, &work_list);
|
|
spin_unlock_irq(&mdev->data.work.q_lock);
|
|
|
|
while (!list_empty(&work_list)) {
|
|
w = list_entry(work_list.next, struct drbd_work, list);
|
|
list_del_init(&w->list);
|
|
w->cb(mdev, w, 1);
|
|
i++; /* dead debugging code */
|
|
}
|
|
|
|
spin_lock_irq(&mdev->data.work.q_lock);
|
|
}
|
|
sema_init(&mdev->data.work.s, 0);
|
|
/* DANGEROUS race: if someone did queue his work within the spinlock,
|
|
* but up() ed outside the spinlock, we could get an up() on the
|
|
* semaphore without corresponding list entry.
|
|
* So don't do that.
|
|
*/
|
|
spin_unlock_irq(&mdev->data.work.q_lock);
|
|
|
|
D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE);
|
|
/* _drbd_set_state only uses stop_nowait.
|
|
* wait here for the Exiting receiver. */
|
|
drbd_thread_stop(&mdev->receiver);
|
|
drbd_mdev_cleanup(mdev);
|
|
|
|
dev_info(DEV, "worker terminated\n");
|
|
|
|
clear_bit(DEVICE_DYING, &mdev->flags);
|
|
clear_bit(CONFIG_PENDING, &mdev->flags);
|
|
wake_up(&mdev->state_wait);
|
|
|
|
return 0;
|
|
}
|