![Philipp Reisner](/assets/img/avatar_default.png)
Allow to change the AL layout with an resize operation. For that the reisze command gets two new fields: al_stripes and al_stripe_size. In order to make the operation crash save: 1) Lock out all IO and MD-IO 2) Write the super block with MDF_PRIMARY_IND clear 3) write the bitmap to the new location (all zeros, since we allow only while connected) 4) Initialize the new AL-area 5) Write the super block with the restored MDF_PRIMARY_IND. 6) Unfreeze all IO Since the AL-layout has no influence on the protocol, this operation needs to be beforemed on both sides of a resource (if intended). Signed-off-by: Andreas Gruenbacher <agruen@linbit.com> Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
1337 lines
38 KiB
C
1337 lines
38 KiB
C
/*
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drbd_actlog.c
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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Copyright (C) 2003-2008, LINBIT Information Technologies GmbH.
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Copyright (C) 2003-2008, Philipp Reisner <philipp.reisner@linbit.com>.
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Copyright (C) 2003-2008, 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/slab.h>
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#include <linux/crc32c.h>
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#include <linux/drbd.h>
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#include <linux/drbd_limits.h>
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#include <linux/dynamic_debug.h>
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#include "drbd_int.h"
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#include "drbd_wrappers.h"
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enum al_transaction_types {
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AL_TR_UPDATE = 0,
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AL_TR_INITIALIZED = 0xffff
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};
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/* all fields on disc in big endian */
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struct __packed al_transaction_on_disk {
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/* don't we all like magic */
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__be32 magic;
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/* to identify the most recent transaction block
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* in the on disk ring buffer */
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__be32 tr_number;
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/* checksum on the full 4k block, with this field set to 0. */
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__be32 crc32c;
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/* type of transaction, special transaction types like:
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* purge-all, set-all-idle, set-all-active, ... to-be-defined
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* see also enum al_transaction_types */
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__be16 transaction_type;
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/* we currently allow only a few thousand extents,
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* so 16bit will be enough for the slot number. */
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/* how many updates in this transaction */
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__be16 n_updates;
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/* maximum slot number, "al-extents" in drbd.conf speak.
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* Having this in each transaction should make reconfiguration
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* of that parameter easier. */
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__be16 context_size;
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/* slot number the context starts with */
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__be16 context_start_slot_nr;
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/* Some reserved bytes. Expected usage is a 64bit counter of
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* sectors-written since device creation, and other data generation tag
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* supporting usage */
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__be32 __reserved[4];
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/* --- 36 byte used --- */
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/* Reserve space for up to AL_UPDATES_PER_TRANSACTION changes
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* in one transaction, then use the remaining byte in the 4k block for
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* context information. "Flexible" number of updates per transaction
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* does not help, as we have to account for the case when all update
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* slots are used anyways, so it would only complicate code without
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* additional benefit.
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*/
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__be16 update_slot_nr[AL_UPDATES_PER_TRANSACTION];
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/* but the extent number is 32bit, which at an extent size of 4 MiB
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* allows to cover device sizes of up to 2**54 Byte (16 PiB) */
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__be32 update_extent_nr[AL_UPDATES_PER_TRANSACTION];
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/* --- 420 bytes used (36 + 64*6) --- */
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/* 4096 - 420 = 3676 = 919 * 4 */
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__be32 context[AL_CONTEXT_PER_TRANSACTION];
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};
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struct update_odbm_work {
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struct drbd_work w;
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unsigned int enr;
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};
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struct update_al_work {
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struct drbd_work w;
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struct completion event;
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int err;
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};
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void *drbd_md_get_buffer(struct drbd_conf *mdev)
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{
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int r;
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wait_event(mdev->misc_wait,
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(r = atomic_cmpxchg(&mdev->md_io_in_use, 0, 1)) == 0 ||
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mdev->state.disk <= D_FAILED);
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return r ? NULL : page_address(mdev->md_io_page);
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}
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void drbd_md_put_buffer(struct drbd_conf *mdev)
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{
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if (atomic_dec_and_test(&mdev->md_io_in_use))
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wake_up(&mdev->misc_wait);
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}
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void wait_until_done_or_force_detached(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
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unsigned int *done)
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{
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long dt;
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rcu_read_lock();
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dt = rcu_dereference(bdev->disk_conf)->disk_timeout;
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rcu_read_unlock();
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dt = dt * HZ / 10;
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if (dt == 0)
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dt = MAX_SCHEDULE_TIMEOUT;
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dt = wait_event_timeout(mdev->misc_wait,
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*done || test_bit(FORCE_DETACH, &mdev->flags), dt);
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if (dt == 0) {
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dev_err(DEV, "meta-data IO operation timed out\n");
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drbd_chk_io_error(mdev, 1, DRBD_FORCE_DETACH);
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}
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}
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static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
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struct drbd_backing_dev *bdev,
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struct page *page, sector_t sector,
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int rw, int size)
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{
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struct bio *bio;
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int err;
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mdev->md_io.done = 0;
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mdev->md_io.error = -ENODEV;
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if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))
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rw |= REQ_FUA | REQ_FLUSH;
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rw |= REQ_SYNC;
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bio = bio_alloc_drbd(GFP_NOIO);
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bio->bi_bdev = bdev->md_bdev;
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bio->bi_sector = sector;
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err = -EIO;
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if (bio_add_page(bio, page, size, 0) != size)
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goto out;
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bio->bi_private = &mdev->md_io;
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bio->bi_end_io = drbd_md_io_complete;
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bio->bi_rw = rw;
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if (!(rw & WRITE) && mdev->state.disk == D_DISKLESS && mdev->ldev == NULL)
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/* special case, drbd_md_read() during drbd_adm_attach(): no get_ldev */
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;
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else if (!get_ldev_if_state(mdev, D_ATTACHING)) {
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/* Corresponding put_ldev in drbd_md_io_complete() */
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dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in _drbd_md_sync_page_io()\n");
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err = -ENODEV;
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goto out;
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}
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bio_get(bio); /* one bio_put() is in the completion handler */
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atomic_inc(&mdev->md_io_in_use); /* drbd_md_put_buffer() is in the completion handler */
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if (drbd_insert_fault(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
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bio_endio(bio, -EIO);
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else
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submit_bio(rw, bio);
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wait_until_done_or_force_detached(mdev, bdev, &mdev->md_io.done);
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if (bio_flagged(bio, BIO_UPTODATE))
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err = mdev->md_io.error;
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out:
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bio_put(bio);
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return err;
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}
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int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
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sector_t sector, int rw)
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{
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int err;
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struct page *iop = mdev->md_io_page;
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D_ASSERT(atomic_read(&mdev->md_io_in_use) == 1);
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BUG_ON(!bdev->md_bdev);
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dev_dbg(DEV, "meta_data io: %s [%d]:%s(,%llus,%s) %pS\n",
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current->comm, current->pid, __func__,
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(unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ",
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(void*)_RET_IP_ );
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if (sector < drbd_md_first_sector(bdev) ||
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sector + 7 > drbd_md_last_sector(bdev))
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dev_alert(DEV, "%s [%d]:%s(,%llus,%s) out of range md access!\n",
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current->comm, current->pid, __func__,
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(unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ");
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/* we do all our meta data IO in aligned 4k blocks. */
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err = _drbd_md_sync_page_io(mdev, bdev, iop, sector, rw, 4096);
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if (err) {
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dev_err(DEV, "drbd_md_sync_page_io(,%llus,%s) failed with error %d\n",
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(unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ", err);
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}
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return err;
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}
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static struct bm_extent *find_active_resync_extent(struct drbd_conf *mdev, unsigned int enr)
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{
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struct lc_element *tmp;
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tmp = lc_find(mdev->resync, enr/AL_EXT_PER_BM_SECT);
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if (unlikely(tmp != NULL)) {
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struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce);
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if (test_bit(BME_NO_WRITES, &bm_ext->flags))
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return bm_ext;
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}
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return NULL;
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}
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static struct lc_element *_al_get(struct drbd_conf *mdev, unsigned int enr, bool nonblock)
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{
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struct lc_element *al_ext;
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struct bm_extent *bm_ext;
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int wake;
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spin_lock_irq(&mdev->al_lock);
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bm_ext = find_active_resync_extent(mdev, enr);
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if (bm_ext) {
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wake = !test_and_set_bit(BME_PRIORITY, &bm_ext->flags);
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spin_unlock_irq(&mdev->al_lock);
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if (wake)
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wake_up(&mdev->al_wait);
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return NULL;
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}
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if (nonblock)
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al_ext = lc_try_get(mdev->act_log, enr);
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else
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al_ext = lc_get(mdev->act_log, enr);
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spin_unlock_irq(&mdev->al_lock);
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return al_ext;
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}
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bool drbd_al_begin_io_fastpath(struct drbd_conf *mdev, struct drbd_interval *i)
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{
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/* for bios crossing activity log extent boundaries,
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* we may need to activate two extents in one go */
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unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
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unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
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D_ASSERT((unsigned)(last - first) <= 1);
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D_ASSERT(atomic_read(&mdev->local_cnt) > 0);
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/* FIXME figure out a fast path for bios crossing AL extent boundaries */
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if (first != last)
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return false;
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return _al_get(mdev, first, true);
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}
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bool drbd_al_begin_io_prepare(struct drbd_conf *mdev, struct drbd_interval *i)
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{
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/* for bios crossing activity log extent boundaries,
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* we may need to activate two extents in one go */
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unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
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unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
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unsigned enr;
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bool need_transaction = false;
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D_ASSERT(first <= last);
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D_ASSERT(atomic_read(&mdev->local_cnt) > 0);
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for (enr = first; enr <= last; enr++) {
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struct lc_element *al_ext;
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wait_event(mdev->al_wait,
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(al_ext = _al_get(mdev, enr, false)) != NULL);
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if (al_ext->lc_number != enr)
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need_transaction = true;
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}
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return need_transaction;
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}
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static int al_write_transaction(struct drbd_conf *mdev, bool delegate);
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/* When called through generic_make_request(), we must delegate
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* activity log I/O to the worker thread: a further request
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* submitted via generic_make_request() within the same task
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* would be queued on current->bio_list, and would only start
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* after this function returns (see generic_make_request()).
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*
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* However, if we *are* the worker, we must not delegate to ourselves.
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*/
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/*
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* @delegate: delegate activity log I/O to the worker thread
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*/
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void drbd_al_begin_io_commit(struct drbd_conf *mdev, bool delegate)
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{
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bool locked = false;
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BUG_ON(delegate && current == mdev->tconn->worker.task);
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/* Serialize multiple transactions.
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* This uses test_and_set_bit, memory barrier is implicit.
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*/
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wait_event(mdev->al_wait,
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mdev->act_log->pending_changes == 0 ||
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(locked = lc_try_lock_for_transaction(mdev->act_log)));
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if (locked) {
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/* Double check: it may have been committed by someone else,
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* while we have been waiting for the lock. */
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if (mdev->act_log->pending_changes) {
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bool write_al_updates;
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rcu_read_lock();
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write_al_updates = rcu_dereference(mdev->ldev->disk_conf)->al_updates;
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rcu_read_unlock();
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if (write_al_updates)
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al_write_transaction(mdev, delegate);
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spin_lock_irq(&mdev->al_lock);
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/* FIXME
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if (err)
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we need an "lc_cancel" here;
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*/
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lc_committed(mdev->act_log);
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spin_unlock_irq(&mdev->al_lock);
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}
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lc_unlock(mdev->act_log);
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wake_up(&mdev->al_wait);
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}
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}
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/*
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* @delegate: delegate activity log I/O to the worker thread
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*/
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void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i, bool delegate)
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{
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BUG_ON(delegate && current == mdev->tconn->worker.task);
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if (drbd_al_begin_io_prepare(mdev, i))
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drbd_al_begin_io_commit(mdev, delegate);
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}
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int drbd_al_begin_io_nonblock(struct drbd_conf *mdev, struct drbd_interval *i)
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{
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struct lru_cache *al = mdev->act_log;
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/* for bios crossing activity log extent boundaries,
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* we may need to activate two extents in one go */
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unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
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unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
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unsigned nr_al_extents;
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unsigned available_update_slots;
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unsigned enr;
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D_ASSERT(first <= last);
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nr_al_extents = 1 + last - first; /* worst case: all touched extends are cold. */
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available_update_slots = min(al->nr_elements - al->used,
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al->max_pending_changes - al->pending_changes);
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/* We want all necessary updates for a given request within the same transaction
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* We could first check how many updates are *actually* needed,
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* and use that instead of the worst-case nr_al_extents */
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if (available_update_slots < nr_al_extents)
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return -EWOULDBLOCK;
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/* Is resync active in this area? */
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for (enr = first; enr <= last; enr++) {
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struct lc_element *tmp;
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tmp = lc_find(mdev->resync, enr/AL_EXT_PER_BM_SECT);
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if (unlikely(tmp != NULL)) {
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struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce);
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if (test_bit(BME_NO_WRITES, &bm_ext->flags)) {
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if (!test_and_set_bit(BME_PRIORITY, &bm_ext->flags))
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return -EBUSY;
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return -EWOULDBLOCK;
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}
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}
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}
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/* Checkout the refcounts.
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* Given that we checked for available elements and update slots above,
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* this has to be successful. */
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for (enr = first; enr <= last; enr++) {
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struct lc_element *al_ext;
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al_ext = lc_get_cumulative(mdev->act_log, enr);
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if (!al_ext)
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dev_info(DEV, "LOGIC BUG for enr=%u\n", enr);
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}
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return 0;
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}
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void drbd_al_complete_io(struct drbd_conf *mdev, struct drbd_interval *i)
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{
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/* for bios crossing activity log extent boundaries,
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* we may need to activate two extents in one go */
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unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
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unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
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unsigned enr;
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struct lc_element *extent;
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unsigned long flags;
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D_ASSERT(first <= last);
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spin_lock_irqsave(&mdev->al_lock, flags);
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for (enr = first; enr <= last; enr++) {
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extent = lc_find(mdev->act_log, enr);
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if (!extent) {
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dev_err(DEV, "al_complete_io() called on inactive extent %u\n", enr);
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continue;
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}
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lc_put(mdev->act_log, extent);
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}
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spin_unlock_irqrestore(&mdev->al_lock, flags);
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wake_up(&mdev->al_wait);
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}
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#if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)
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/* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT
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* are still coupled, or assume too much about their relation.
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* Code below will not work if this is violated.
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* Will be cleaned up with some followup patch.
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*/
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# error FIXME
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#endif
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static unsigned int al_extent_to_bm_page(unsigned int al_enr)
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{
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return al_enr >>
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/* bit to page */
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((PAGE_SHIFT + 3) -
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/* al extent number to bit */
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(AL_EXTENT_SHIFT - BM_BLOCK_SHIFT));
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}
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static unsigned int rs_extent_to_bm_page(unsigned int rs_enr)
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{
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return rs_enr >>
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/* bit to page */
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((PAGE_SHIFT + 3) -
|
|
/* resync extent number to bit */
|
|
(BM_EXT_SHIFT - BM_BLOCK_SHIFT));
|
|
}
|
|
|
|
static sector_t al_tr_number_to_on_disk_sector(struct drbd_conf *mdev)
|
|
{
|
|
const unsigned int stripes = mdev->ldev->md.al_stripes;
|
|
const unsigned int stripe_size_4kB = mdev->ldev->md.al_stripe_size_4k;
|
|
|
|
/* transaction number, modulo on-disk ring buffer wrap around */
|
|
unsigned int t = mdev->al_tr_number % (mdev->ldev->md.al_size_4k);
|
|
|
|
/* ... to aligned 4k on disk block */
|
|
t = ((t % stripes) * stripe_size_4kB) + t/stripes;
|
|
|
|
/* ... to 512 byte sector in activity log */
|
|
t *= 8;
|
|
|
|
/* ... plus offset to the on disk position */
|
|
return mdev->ldev->md.md_offset + mdev->ldev->md.al_offset + t;
|
|
}
|
|
|
|
static int
|
|
_al_write_transaction(struct drbd_conf *mdev)
|
|
{
|
|
struct al_transaction_on_disk *buffer;
|
|
struct lc_element *e;
|
|
sector_t sector;
|
|
int i, mx;
|
|
unsigned extent_nr;
|
|
unsigned crc = 0;
|
|
int err = 0;
|
|
|
|
if (!get_ldev(mdev)) {
|
|
dev_err(DEV, "disk is %s, cannot start al transaction\n",
|
|
drbd_disk_str(mdev->state.disk));
|
|
return -EIO;
|
|
}
|
|
|
|
/* The bitmap write may have failed, causing a state change. */
|
|
if (mdev->state.disk < D_INCONSISTENT) {
|
|
dev_err(DEV,
|
|
"disk is %s, cannot write al transaction\n",
|
|
drbd_disk_str(mdev->state.disk));
|
|
put_ldev(mdev);
|
|
return -EIO;
|
|
}
|
|
|
|
buffer = drbd_md_get_buffer(mdev); /* protects md_io_buffer, al_tr_cycle, ... */
|
|
if (!buffer) {
|
|
dev_err(DEV, "disk failed while waiting for md_io buffer\n");
|
|
put_ldev(mdev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
memset(buffer, 0, sizeof(*buffer));
|
|
buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
|
|
buffer->tr_number = cpu_to_be32(mdev->al_tr_number);
|
|
|
|
i = 0;
|
|
|
|
/* Even though no one can start to change this list
|
|
* once we set the LC_LOCKED -- from drbd_al_begin_io(),
|
|
* lc_try_lock_for_transaction() --, someone may still
|
|
* be in the process of changing it. */
|
|
spin_lock_irq(&mdev->al_lock);
|
|
list_for_each_entry(e, &mdev->act_log->to_be_changed, list) {
|
|
if (i == AL_UPDATES_PER_TRANSACTION) {
|
|
i++;
|
|
break;
|
|
}
|
|
buffer->update_slot_nr[i] = cpu_to_be16(e->lc_index);
|
|
buffer->update_extent_nr[i] = cpu_to_be32(e->lc_new_number);
|
|
if (e->lc_number != LC_FREE)
|
|
drbd_bm_mark_for_writeout(mdev,
|
|
al_extent_to_bm_page(e->lc_number));
|
|
i++;
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
BUG_ON(i > AL_UPDATES_PER_TRANSACTION);
|
|
|
|
buffer->n_updates = cpu_to_be16(i);
|
|
for ( ; i < AL_UPDATES_PER_TRANSACTION; i++) {
|
|
buffer->update_slot_nr[i] = cpu_to_be16(-1);
|
|
buffer->update_extent_nr[i] = cpu_to_be32(LC_FREE);
|
|
}
|
|
|
|
buffer->context_size = cpu_to_be16(mdev->act_log->nr_elements);
|
|
buffer->context_start_slot_nr = cpu_to_be16(mdev->al_tr_cycle);
|
|
|
|
mx = min_t(int, AL_CONTEXT_PER_TRANSACTION,
|
|
mdev->act_log->nr_elements - mdev->al_tr_cycle);
|
|
for (i = 0; i < mx; i++) {
|
|
unsigned idx = mdev->al_tr_cycle + i;
|
|
extent_nr = lc_element_by_index(mdev->act_log, idx)->lc_number;
|
|
buffer->context[i] = cpu_to_be32(extent_nr);
|
|
}
|
|
for (; i < AL_CONTEXT_PER_TRANSACTION; i++)
|
|
buffer->context[i] = cpu_to_be32(LC_FREE);
|
|
|
|
mdev->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION;
|
|
if (mdev->al_tr_cycle >= mdev->act_log->nr_elements)
|
|
mdev->al_tr_cycle = 0;
|
|
|
|
sector = al_tr_number_to_on_disk_sector(mdev);
|
|
|
|
crc = crc32c(0, buffer, 4096);
|
|
buffer->crc32c = cpu_to_be32(crc);
|
|
|
|
if (drbd_bm_write_hinted(mdev))
|
|
err = -EIO;
|
|
else {
|
|
bool write_al_updates;
|
|
rcu_read_lock();
|
|
write_al_updates = rcu_dereference(mdev->ldev->disk_conf)->al_updates;
|
|
rcu_read_unlock();
|
|
if (write_al_updates) {
|
|
if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
|
|
err = -EIO;
|
|
drbd_chk_io_error(mdev, 1, DRBD_META_IO_ERROR);
|
|
} else {
|
|
mdev->al_tr_number++;
|
|
mdev->al_writ_cnt++;
|
|
}
|
|
}
|
|
}
|
|
|
|
drbd_md_put_buffer(mdev);
|
|
put_ldev(mdev);
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
static int w_al_write_transaction(struct drbd_work *w, int unused)
|
|
{
|
|
struct update_al_work *aw = container_of(w, struct update_al_work, w);
|
|
struct drbd_conf *mdev = w->mdev;
|
|
int err;
|
|
|
|
err = _al_write_transaction(mdev);
|
|
aw->err = err;
|
|
complete(&aw->event);
|
|
|
|
return err != -EIO ? err : 0;
|
|
}
|
|
|
|
/* Calls from worker context (see w_restart_disk_io()) need to write the
|
|
transaction directly. Others came through generic_make_request(),
|
|
those need to delegate it to the worker. */
|
|
static int al_write_transaction(struct drbd_conf *mdev, bool delegate)
|
|
{
|
|
if (delegate) {
|
|
struct update_al_work al_work;
|
|
init_completion(&al_work.event);
|
|
al_work.w.cb = w_al_write_transaction;
|
|
al_work.w.mdev = mdev;
|
|
drbd_queue_work_front(&mdev->tconn->sender_work, &al_work.w);
|
|
wait_for_completion(&al_work.event);
|
|
return al_work.err;
|
|
} else
|
|
return _al_write_transaction(mdev);
|
|
}
|
|
|
|
static int _try_lc_del(struct drbd_conf *mdev, struct lc_element *al_ext)
|
|
{
|
|
int rv;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
rv = (al_ext->refcnt == 0);
|
|
if (likely(rv))
|
|
lc_del(mdev->act_log, al_ext);
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_al_shrink() - Removes all active extents form the activity log
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Removes all active extents form the activity log, waiting until
|
|
* the reference count of each entry dropped to 0 first, of course.
|
|
*
|
|
* You need to lock mdev->act_log with lc_try_lock() / lc_unlock()
|
|
*/
|
|
void drbd_al_shrink(struct drbd_conf *mdev)
|
|
{
|
|
struct lc_element *al_ext;
|
|
int i;
|
|
|
|
D_ASSERT(test_bit(__LC_LOCKED, &mdev->act_log->flags));
|
|
|
|
for (i = 0; i < mdev->act_log->nr_elements; i++) {
|
|
al_ext = lc_element_by_index(mdev->act_log, i);
|
|
if (al_ext->lc_number == LC_FREE)
|
|
continue;
|
|
wait_event(mdev->al_wait, _try_lc_del(mdev, al_ext));
|
|
}
|
|
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
int drbd_initialize_al(struct drbd_conf *mdev, void *buffer)
|
|
{
|
|
struct al_transaction_on_disk *al = buffer;
|
|
struct drbd_md *md = &mdev->ldev->md;
|
|
sector_t al_base = md->md_offset + md->al_offset;
|
|
int al_size_4k = md->al_stripes * md->al_stripe_size_4k;
|
|
int i;
|
|
|
|
memset(al, 0, 4096);
|
|
al->magic = cpu_to_be32(DRBD_AL_MAGIC);
|
|
al->transaction_type = cpu_to_be16(AL_TR_INITIALIZED);
|
|
al->crc32c = cpu_to_be32(crc32c(0, al, 4096));
|
|
|
|
for (i = 0; i < al_size_4k; i++) {
|
|
int err = drbd_md_sync_page_io(mdev, mdev->ldev, al_base + i * 8, WRITE);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int w_update_odbm(struct drbd_work *w, int unused)
|
|
{
|
|
struct update_odbm_work *udw = container_of(w, struct update_odbm_work, w);
|
|
struct drbd_conf *mdev = w->mdev;
|
|
struct sib_info sib = { .sib_reason = SIB_SYNC_PROGRESS, };
|
|
|
|
if (!get_ldev(mdev)) {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_warn(DEV, "Can not update on disk bitmap, local IO disabled.\n");
|
|
kfree(udw);
|
|
return 0;
|
|
}
|
|
|
|
drbd_bm_write_page(mdev, rs_extent_to_bm_page(udw->enr));
|
|
put_ldev(mdev);
|
|
|
|
kfree(udw);
|
|
|
|
if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) {
|
|
switch (mdev->state.conn) {
|
|
case C_SYNC_SOURCE: case C_SYNC_TARGET:
|
|
case C_PAUSED_SYNC_S: case C_PAUSED_SYNC_T:
|
|
drbd_resync_finished(mdev);
|
|
default:
|
|
/* nothing to do */
|
|
break;
|
|
}
|
|
}
|
|
drbd_bcast_event(mdev, &sib);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* ATTENTION. The AL's extents are 4MB each, while the extents in the
|
|
* resync LRU-cache are 16MB each.
|
|
* The caller of this function has to hold an get_ldev() reference.
|
|
*
|
|
* TODO will be obsoleted once we have a caching lru of the on disk bitmap
|
|
*/
|
|
static void drbd_try_clear_on_disk_bm(struct drbd_conf *mdev, sector_t sector,
|
|
int count, int success)
|
|
{
|
|
struct lc_element *e;
|
|
struct update_odbm_work *udw;
|
|
|
|
unsigned int enr;
|
|
|
|
D_ASSERT(atomic_read(&mdev->local_cnt));
|
|
|
|
/* I simply assume that a sector/size pair never crosses
|
|
* a 16 MB extent border. (Currently this is true...) */
|
|
enr = BM_SECT_TO_EXT(sector);
|
|
|
|
e = lc_get(mdev->resync, enr);
|
|
if (e) {
|
|
struct bm_extent *ext = lc_entry(e, struct bm_extent, lce);
|
|
if (ext->lce.lc_number == enr) {
|
|
if (success)
|
|
ext->rs_left -= count;
|
|
else
|
|
ext->rs_failed += count;
|
|
if (ext->rs_left < ext->rs_failed) {
|
|
dev_warn(DEV, "BAD! sector=%llus enr=%u rs_left=%d "
|
|
"rs_failed=%d count=%d cstate=%s\n",
|
|
(unsigned long long)sector,
|
|
ext->lce.lc_number, ext->rs_left,
|
|
ext->rs_failed, count,
|
|
drbd_conn_str(mdev->state.conn));
|
|
|
|
/* We don't expect to be able to clear more bits
|
|
* than have been set when we originally counted
|
|
* the set bits to cache that value in ext->rs_left.
|
|
* Whatever the reason (disconnect during resync,
|
|
* delayed local completion of an application write),
|
|
* try to fix it up by recounting here. */
|
|
ext->rs_left = drbd_bm_e_weight(mdev, enr);
|
|
}
|
|
} else {
|
|
/* Normally this element should be in the cache,
|
|
* since drbd_rs_begin_io() pulled it already in.
|
|
*
|
|
* But maybe an application write finished, and we set
|
|
* something outside the resync lru_cache in sync.
|
|
*/
|
|
int rs_left = drbd_bm_e_weight(mdev, enr);
|
|
if (ext->flags != 0) {
|
|
dev_warn(DEV, "changing resync lce: %d[%u;%02lx]"
|
|
" -> %d[%u;00]\n",
|
|
ext->lce.lc_number, ext->rs_left,
|
|
ext->flags, enr, rs_left);
|
|
ext->flags = 0;
|
|
}
|
|
if (ext->rs_failed) {
|
|
dev_warn(DEV, "Kicking resync_lru element enr=%u "
|
|
"out with rs_failed=%d\n",
|
|
ext->lce.lc_number, ext->rs_failed);
|
|
}
|
|
ext->rs_left = rs_left;
|
|
ext->rs_failed = success ? 0 : count;
|
|
/* we don't keep a persistent log of the resync lru,
|
|
* we can commit any change right away. */
|
|
lc_committed(mdev->resync);
|
|
}
|
|
lc_put(mdev->resync, &ext->lce);
|
|
/* no race, we are within the al_lock! */
|
|
|
|
if (ext->rs_left == ext->rs_failed) {
|
|
ext->rs_failed = 0;
|
|
|
|
udw = kmalloc(sizeof(*udw), GFP_ATOMIC);
|
|
if (udw) {
|
|
udw->enr = ext->lce.lc_number;
|
|
udw->w.cb = w_update_odbm;
|
|
udw->w.mdev = mdev;
|
|
drbd_queue_work_front(&mdev->tconn->sender_work, &udw->w);
|
|
} else {
|
|
dev_warn(DEV, "Could not kmalloc an udw\n");
|
|
}
|
|
}
|
|
} else {
|
|
dev_err(DEV, "lc_get() failed! locked=%d/%d flags=%lu\n",
|
|
mdev->resync_locked,
|
|
mdev->resync->nr_elements,
|
|
mdev->resync->flags);
|
|
}
|
|
}
|
|
|
|
void drbd_advance_rs_marks(struct drbd_conf *mdev, unsigned long still_to_go)
|
|
{
|
|
unsigned long now = jiffies;
|
|
unsigned long last = mdev->rs_mark_time[mdev->rs_last_mark];
|
|
int next = (mdev->rs_last_mark + 1) % DRBD_SYNC_MARKS;
|
|
if (time_after_eq(now, last + DRBD_SYNC_MARK_STEP)) {
|
|
if (mdev->rs_mark_left[mdev->rs_last_mark] != still_to_go &&
|
|
mdev->state.conn != C_PAUSED_SYNC_T &&
|
|
mdev->state.conn != C_PAUSED_SYNC_S) {
|
|
mdev->rs_mark_time[next] = now;
|
|
mdev->rs_mark_left[next] = still_to_go;
|
|
mdev->rs_last_mark = next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* clear the bit corresponding to the piece of storage in question:
|
|
* size byte of data starting from sector. Only clear a bits of the affected
|
|
* one ore more _aligned_ BM_BLOCK_SIZE blocks.
|
|
*
|
|
* called by worker on C_SYNC_TARGET and receiver on SyncSource.
|
|
*
|
|
*/
|
|
void __drbd_set_in_sync(struct drbd_conf *mdev, sector_t sector, int size,
|
|
const char *file, const unsigned int line)
|
|
{
|
|
/* Is called from worker and receiver context _only_ */
|
|
unsigned long sbnr, ebnr, lbnr;
|
|
unsigned long count = 0;
|
|
sector_t esector, nr_sectors;
|
|
int wake_up = 0;
|
|
unsigned long flags;
|
|
|
|
if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) {
|
|
dev_err(DEV, "drbd_set_in_sync: sector=%llus size=%d nonsense!\n",
|
|
(unsigned long long)sector, size);
|
|
return;
|
|
}
|
|
|
|
if (!get_ldev(mdev))
|
|
return; /* no disk, no metadata, no bitmap to clear bits in */
|
|
|
|
nr_sectors = drbd_get_capacity(mdev->this_bdev);
|
|
esector = sector + (size >> 9) - 1;
|
|
|
|
if (!expect(sector < nr_sectors))
|
|
goto out;
|
|
if (!expect(esector < nr_sectors))
|
|
esector = nr_sectors - 1;
|
|
|
|
lbnr = BM_SECT_TO_BIT(nr_sectors-1);
|
|
|
|
/* we clear it (in sync).
|
|
* round up start sector, round down end sector. we make sure we only
|
|
* clear full, aligned, BM_BLOCK_SIZE (4K) blocks */
|
|
if (unlikely(esector < BM_SECT_PER_BIT-1))
|
|
goto out;
|
|
if (unlikely(esector == (nr_sectors-1)))
|
|
ebnr = lbnr;
|
|
else
|
|
ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1));
|
|
sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1);
|
|
|
|
if (sbnr > ebnr)
|
|
goto out;
|
|
|
|
/*
|
|
* ok, (capacity & 7) != 0 sometimes, but who cares...
|
|
* we count rs_{total,left} in bits, not sectors.
|
|
*/
|
|
count = drbd_bm_clear_bits(mdev, sbnr, ebnr);
|
|
if (count) {
|
|
drbd_advance_rs_marks(mdev, drbd_bm_total_weight(mdev));
|
|
spin_lock_irqsave(&mdev->al_lock, flags);
|
|
drbd_try_clear_on_disk_bm(mdev, sector, count, true);
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
|
|
/* just wake_up unconditional now, various lc_chaged(),
|
|
* lc_put() in drbd_try_clear_on_disk_bm(). */
|
|
wake_up = 1;
|
|
}
|
|
out:
|
|
put_ldev(mdev);
|
|
if (wake_up)
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
/*
|
|
* this is intended to set one request worth of data out of sync.
|
|
* affects at least 1 bit,
|
|
* and at most 1+DRBD_MAX_BIO_SIZE/BM_BLOCK_SIZE bits.
|
|
*
|
|
* called by tl_clear and drbd_send_dblock (==drbd_make_request).
|
|
* so this can be _any_ process.
|
|
*/
|
|
int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, int size,
|
|
const char *file, const unsigned int line)
|
|
{
|
|
unsigned long sbnr, ebnr, flags;
|
|
sector_t esector, nr_sectors;
|
|
unsigned int enr, count = 0;
|
|
struct lc_element *e;
|
|
|
|
/* this should be an empty REQ_FLUSH */
|
|
if (size == 0)
|
|
return 0;
|
|
|
|
if (size < 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) {
|
|
dev_err(DEV, "sector: %llus, size: %d\n",
|
|
(unsigned long long)sector, size);
|
|
return 0;
|
|
}
|
|
|
|
if (!get_ldev(mdev))
|
|
return 0; /* no disk, no metadata, no bitmap to set bits in */
|
|
|
|
nr_sectors = drbd_get_capacity(mdev->this_bdev);
|
|
esector = sector + (size >> 9) - 1;
|
|
|
|
if (!expect(sector < nr_sectors))
|
|
goto out;
|
|
if (!expect(esector < nr_sectors))
|
|
esector = nr_sectors - 1;
|
|
|
|
/* we set it out of sync,
|
|
* we do not need to round anything here */
|
|
sbnr = BM_SECT_TO_BIT(sector);
|
|
ebnr = BM_SECT_TO_BIT(esector);
|
|
|
|
/* ok, (capacity & 7) != 0 sometimes, but who cares...
|
|
* we count rs_{total,left} in bits, not sectors. */
|
|
spin_lock_irqsave(&mdev->al_lock, flags);
|
|
count = drbd_bm_set_bits(mdev, sbnr, ebnr);
|
|
|
|
enr = BM_SECT_TO_EXT(sector);
|
|
e = lc_find(mdev->resync, enr);
|
|
if (e)
|
|
lc_entry(e, struct bm_extent, lce)->rs_left += count;
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
|
|
out:
|
|
put_ldev(mdev);
|
|
|
|
return count;
|
|
}
|
|
|
|
static
|
|
struct bm_extent *_bme_get(struct drbd_conf *mdev, unsigned int enr)
|
|
{
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int wakeup = 0;
|
|
unsigned long rs_flags;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
if (mdev->resync_locked > mdev->resync->nr_elements/2) {
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return NULL;
|
|
}
|
|
e = lc_get(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (bm_ext) {
|
|
if (bm_ext->lce.lc_number != enr) {
|
|
bm_ext->rs_left = drbd_bm_e_weight(mdev, enr);
|
|
bm_ext->rs_failed = 0;
|
|
lc_committed(mdev->resync);
|
|
wakeup = 1;
|
|
}
|
|
if (bm_ext->lce.refcnt == 1)
|
|
mdev->resync_locked++;
|
|
set_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
}
|
|
rs_flags = mdev->resync->flags;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
if (wakeup)
|
|
wake_up(&mdev->al_wait);
|
|
|
|
if (!bm_ext) {
|
|
if (rs_flags & LC_STARVING)
|
|
dev_warn(DEV, "Have to wait for element"
|
|
" (resync LRU too small?)\n");
|
|
BUG_ON(rs_flags & LC_LOCKED);
|
|
}
|
|
|
|
return bm_ext;
|
|
}
|
|
|
|
static int _is_in_al(struct drbd_conf *mdev, unsigned int enr)
|
|
{
|
|
int rv;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
rv = lc_is_used(mdev->act_log, enr);
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_begin_io() - Gets an extent in the resync LRU cache and sets it to BME_LOCKED
|
|
* @mdev: DRBD device.
|
|
* @sector: The sector number.
|
|
*
|
|
* This functions sleeps on al_wait. Returns 0 on success, -EINTR if interrupted.
|
|
*/
|
|
int drbd_rs_begin_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = BM_SECT_TO_EXT(sector);
|
|
struct bm_extent *bm_ext;
|
|
int i, sig;
|
|
int sa = 200; /* Step aside 200 times, then grab the extent and let app-IO wait.
|
|
200 times -> 20 seconds. */
|
|
|
|
retry:
|
|
sig = wait_event_interruptible(mdev->al_wait,
|
|
(bm_ext = _bme_get(mdev, enr)));
|
|
if (sig)
|
|
return -EINTR;
|
|
|
|
if (test_bit(BME_LOCKED, &bm_ext->flags))
|
|
return 0;
|
|
|
|
for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
|
|
sig = wait_event_interruptible(mdev->al_wait,
|
|
!_is_in_al(mdev, enr * AL_EXT_PER_BM_SECT + i) ||
|
|
test_bit(BME_PRIORITY, &bm_ext->flags));
|
|
|
|
if (sig || (test_bit(BME_PRIORITY, &bm_ext->flags) && sa)) {
|
|
spin_lock_irq(&mdev->al_lock);
|
|
if (lc_put(mdev->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0; /* clears BME_NO_WRITES and eventually BME_PRIORITY */
|
|
mdev->resync_locked--;
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
if (sig)
|
|
return -EINTR;
|
|
if (schedule_timeout_interruptible(HZ/10))
|
|
return -EINTR;
|
|
if (sa && --sa == 0)
|
|
dev_warn(DEV,"drbd_rs_begin_io() stepped aside for 20sec."
|
|
"Resync stalled?\n");
|
|
goto retry;
|
|
}
|
|
}
|
|
set_bit(BME_LOCKED, &bm_ext->flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drbd_try_rs_begin_io() - Gets an extent in the resync LRU cache, does not sleep
|
|
* @mdev: DRBD device.
|
|
* @sector: The sector number.
|
|
*
|
|
* Gets an extent in the resync LRU cache, sets it to BME_NO_WRITES, then
|
|
* tries to set it to BME_LOCKED. Returns 0 upon success, and -EAGAIN
|
|
* if there is still application IO going on in this area.
|
|
*/
|
|
int drbd_try_rs_begin_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = BM_SECT_TO_EXT(sector);
|
|
const unsigned int al_enr = enr*AL_EXT_PER_BM_SECT;
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int i;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
if (mdev->resync_wenr != LC_FREE && mdev->resync_wenr != enr) {
|
|
/* in case you have very heavy scattered io, it may
|
|
* stall the syncer undefined if we give up the ref count
|
|
* when we try again and requeue.
|
|
*
|
|
* if we don't give up the refcount, but the next time
|
|
* we are scheduled this extent has been "synced" by new
|
|
* application writes, we'd miss the lc_put on the
|
|
* extent we keep the refcount on.
|
|
* so we remembered which extent we had to try again, and
|
|
* if the next requested one is something else, we do
|
|
* the lc_put here...
|
|
* we also have to wake_up
|
|
*/
|
|
e = lc_find(mdev->resync, mdev->resync_wenr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (bm_ext) {
|
|
D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
clear_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
mdev->resync_wenr = LC_FREE;
|
|
if (lc_put(mdev->resync, &bm_ext->lce) == 0)
|
|
mdev->resync_locked--;
|
|
wake_up(&mdev->al_wait);
|
|
} else {
|
|
dev_alert(DEV, "LOGIC BUG\n");
|
|
}
|
|
}
|
|
/* TRY. */
|
|
e = lc_try_get(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (bm_ext) {
|
|
if (test_bit(BME_LOCKED, &bm_ext->flags))
|
|
goto proceed;
|
|
if (!test_and_set_bit(BME_NO_WRITES, &bm_ext->flags)) {
|
|
mdev->resync_locked++;
|
|
} else {
|
|
/* we did set the BME_NO_WRITES,
|
|
* but then could not set BME_LOCKED,
|
|
* so we tried again.
|
|
* drop the extra reference. */
|
|
bm_ext->lce.refcnt--;
|
|
D_ASSERT(bm_ext->lce.refcnt > 0);
|
|
}
|
|
goto check_al;
|
|
} else {
|
|
/* do we rather want to try later? */
|
|
if (mdev->resync_locked > mdev->resync->nr_elements-3)
|
|
goto try_again;
|
|
/* Do or do not. There is no try. -- Yoda */
|
|
e = lc_get(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (!bm_ext) {
|
|
const unsigned long rs_flags = mdev->resync->flags;
|
|
if (rs_flags & LC_STARVING)
|
|
dev_warn(DEV, "Have to wait for element"
|
|
" (resync LRU too small?)\n");
|
|
BUG_ON(rs_flags & LC_LOCKED);
|
|
goto try_again;
|
|
}
|
|
if (bm_ext->lce.lc_number != enr) {
|
|
bm_ext->rs_left = drbd_bm_e_weight(mdev, enr);
|
|
bm_ext->rs_failed = 0;
|
|
lc_committed(mdev->resync);
|
|
wake_up(&mdev->al_wait);
|
|
D_ASSERT(test_bit(BME_LOCKED, &bm_ext->flags) == 0);
|
|
}
|
|
set_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
D_ASSERT(bm_ext->lce.refcnt == 1);
|
|
mdev->resync_locked++;
|
|
goto check_al;
|
|
}
|
|
check_al:
|
|
for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
|
|
if (lc_is_used(mdev->act_log, al_enr+i))
|
|
goto try_again;
|
|
}
|
|
set_bit(BME_LOCKED, &bm_ext->flags);
|
|
proceed:
|
|
mdev->resync_wenr = LC_FREE;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return 0;
|
|
|
|
try_again:
|
|
if (bm_ext)
|
|
mdev->resync_wenr = enr;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = BM_SECT_TO_EXT(sector);
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mdev->al_lock, flags);
|
|
e = lc_find(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (!bm_ext) {
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "drbd_rs_complete_io() called, but extent not found\n");
|
|
return;
|
|
}
|
|
|
|
if (bm_ext->lce.refcnt == 0) {
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
dev_err(DEV, "drbd_rs_complete_io(,%llu [=%u]) called, "
|
|
"but refcnt is 0!?\n",
|
|
(unsigned long long)sector, enr);
|
|
return;
|
|
}
|
|
|
|
if (lc_put(mdev->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0; /* clear BME_LOCKED, BME_NO_WRITES and BME_PRIORITY */
|
|
mdev->resync_locked--;
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_cancel_all() - Removes all extents from the resync LRU (even BME_LOCKED)
|
|
* @mdev: DRBD device.
|
|
*/
|
|
void drbd_rs_cancel_all(struct drbd_conf *mdev)
|
|
{
|
|
spin_lock_irq(&mdev->al_lock);
|
|
|
|
if (get_ldev_if_state(mdev, D_FAILED)) { /* Makes sure ->resync is there. */
|
|
lc_reset(mdev->resync);
|
|
put_ldev(mdev);
|
|
}
|
|
mdev->resync_locked = 0;
|
|
mdev->resync_wenr = LC_FREE;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_del_all() - Gracefully remove all extents from the resync LRU
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Returns 0 upon success, -EAGAIN if at least one reference count was
|
|
* not zero.
|
|
*/
|
|
int drbd_rs_del_all(struct drbd_conf *mdev)
|
|
{
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int i;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
|
|
if (get_ldev_if_state(mdev, D_FAILED)) {
|
|
/* ok, ->resync is there. */
|
|
for (i = 0; i < mdev->resync->nr_elements; i++) {
|
|
e = lc_element_by_index(mdev->resync, i);
|
|
bm_ext = lc_entry(e, struct bm_extent, lce);
|
|
if (bm_ext->lce.lc_number == LC_FREE)
|
|
continue;
|
|
if (bm_ext->lce.lc_number == mdev->resync_wenr) {
|
|
dev_info(DEV, "dropping %u in drbd_rs_del_all, apparently"
|
|
" got 'synced' by application io\n",
|
|
mdev->resync_wenr);
|
|
D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
clear_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
mdev->resync_wenr = LC_FREE;
|
|
lc_put(mdev->resync, &bm_ext->lce);
|
|
}
|
|
if (bm_ext->lce.refcnt != 0) {
|
|
dev_info(DEV, "Retrying drbd_rs_del_all() later. "
|
|
"refcnt=%d\n", bm_ext->lce.refcnt);
|
|
put_ldev(mdev);
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return -EAGAIN;
|
|
}
|
|
D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(!test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
lc_del(mdev->resync, &bm_ext->lce);
|
|
}
|
|
D_ASSERT(mdev->resync->used == 0);
|
|
put_ldev(mdev);
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
wake_up(&mdev->al_wait);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_failed_io() - Record information on a failure to resync the specified blocks
|
|
* @mdev: DRBD device.
|
|
* @sector: The sector number.
|
|
* @size: Size of failed IO operation, in byte.
|
|
*/
|
|
void drbd_rs_failed_io(struct drbd_conf *mdev, sector_t sector, int size)
|
|
{
|
|
/* Is called from worker and receiver context _only_ */
|
|
unsigned long sbnr, ebnr, lbnr;
|
|
unsigned long count;
|
|
sector_t esector, nr_sectors;
|
|
int wake_up = 0;
|
|
|
|
if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) {
|
|
dev_err(DEV, "drbd_rs_failed_io: sector=%llus size=%d nonsense!\n",
|
|
(unsigned long long)sector, size);
|
|
return;
|
|
}
|
|
nr_sectors = drbd_get_capacity(mdev->this_bdev);
|
|
esector = sector + (size >> 9) - 1;
|
|
|
|
if (!expect(sector < nr_sectors))
|
|
return;
|
|
if (!expect(esector < nr_sectors))
|
|
esector = nr_sectors - 1;
|
|
|
|
lbnr = BM_SECT_TO_BIT(nr_sectors-1);
|
|
|
|
/*
|
|
* round up start sector, round down end sector. we make sure we only
|
|
* handle full, aligned, BM_BLOCK_SIZE (4K) blocks */
|
|
if (unlikely(esector < BM_SECT_PER_BIT-1))
|
|
return;
|
|
if (unlikely(esector == (nr_sectors-1)))
|
|
ebnr = lbnr;
|
|
else
|
|
ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1));
|
|
sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1);
|
|
|
|
if (sbnr > ebnr)
|
|
return;
|
|
|
|
/*
|
|
* ok, (capacity & 7) != 0 sometimes, but who cares...
|
|
* we count rs_{total,left} in bits, not sectors.
|
|
*/
|
|
spin_lock_irq(&mdev->al_lock);
|
|
count = drbd_bm_count_bits(mdev, sbnr, ebnr);
|
|
if (count) {
|
|
mdev->rs_failed += count;
|
|
|
|
if (get_ldev(mdev)) {
|
|
drbd_try_clear_on_disk_bm(mdev, sector, count, false);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/* just wake_up unconditional now, various lc_chaged(),
|
|
* lc_put() in drbd_try_clear_on_disk_bm(). */
|
|
wake_up = 1;
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
if (wake_up)
|
|
wake_up(&mdev->al_wait);
|
|
}
|