![Andreas Gruenbacher](/assets/img/avatar_default.png)
Now they follow the _endio naming sheme. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
1221 lines
36 KiB
C
1221 lines
36 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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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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void *drbd_md_get_buffer(struct drbd_device *device, const char *intent)
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{
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int r;
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wait_event(device->misc_wait,
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(r = atomic_cmpxchg(&device->md_io.in_use, 0, 1)) == 0 ||
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device->state.disk <= D_FAILED);
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if (r)
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return NULL;
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device->md_io.current_use = intent;
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device->md_io.start_jif = jiffies;
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device->md_io.submit_jif = device->md_io.start_jif - 1;
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return page_address(device->md_io.page);
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}
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void drbd_md_put_buffer(struct drbd_device *device)
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{
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if (atomic_dec_and_test(&device->md_io.in_use))
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wake_up(&device->misc_wait);
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}
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void wait_until_done_or_force_detached(struct drbd_device *device, 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(device->misc_wait,
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*done || test_bit(FORCE_DETACH, &device->flags), dt);
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if (dt == 0) {
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drbd_err(device, "meta-data IO operation timed out\n");
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drbd_chk_io_error(device, 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_device *device,
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struct drbd_backing_dev *bdev,
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sector_t sector, int rw)
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{
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struct bio *bio;
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/* we do all our meta data IO in aligned 4k blocks. */
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const int size = 4096;
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int err;
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device->md_io.done = 0;
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device->md_io.error = -ENODEV;
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if ((rw & WRITE) && !test_bit(MD_NO_FUA, &device->flags))
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rw |= REQ_FUA | REQ_FLUSH;
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rw |= REQ_SYNC | REQ_NOIDLE;
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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_iter.bi_sector = sector;
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err = -EIO;
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if (bio_add_page(bio, device->md_io.page, size, 0) != size)
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goto out;
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bio->bi_private = device;
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bio->bi_end_io = drbd_md_endio;
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bio->bi_rw = rw;
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if (!(rw & WRITE) && device->state.disk == D_DISKLESS && device->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(device, D_ATTACHING)) {
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/* Corresponding put_ldev in drbd_md_endio() */
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drbd_err(device, "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(&device->md_io.in_use); /* drbd_md_put_buffer() is in the completion handler */
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device->md_io.submit_jif = jiffies;
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if (drbd_insert_fault(device, (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(device, bdev, &device->md_io.done);
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if (bio_flagged(bio, BIO_UPTODATE))
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err = device->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_device *device, 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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D_ASSERT(device, atomic_read(&device->md_io.in_use) == 1);
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BUG_ON(!bdev->md_bdev);
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dynamic_drbd_dbg(device, "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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drbd_alert(device, "%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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err = _drbd_md_sync_page_io(device, bdev, sector, rw);
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if (err) {
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drbd_err(device, "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_device *device, unsigned int enr)
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{
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struct lc_element *tmp;
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tmp = lc_find(device->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_device *device, 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(&device->al_lock);
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bm_ext = find_active_resync_extent(device, 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(&device->al_lock);
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if (wake)
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wake_up(&device->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(device->act_log, enr);
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else
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al_ext = lc_get(device->act_log, enr);
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spin_unlock_irq(&device->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_device *device, 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(device, (unsigned)(last - first) <= 1);
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D_ASSERT(device, atomic_read(&device->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(device, first, true);
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}
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bool drbd_al_begin_io_prepare(struct drbd_device *device, 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(device, first <= last);
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D_ASSERT(device, atomic_read(&device->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(device->al_wait,
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(al_ext = _al_get(device, 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_device *device);
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void drbd_al_begin_io_commit(struct drbd_device *device)
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{
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bool locked = false;
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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(device->al_wait,
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device->act_log->pending_changes == 0 ||
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(locked = lc_try_lock_for_transaction(device->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 (device->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(device->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(device);
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spin_lock_irq(&device->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(device->act_log);
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spin_unlock_irq(&device->al_lock);
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}
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lc_unlock(device->act_log);
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wake_up(&device->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_device *device, struct drbd_interval *i)
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{
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if (drbd_al_begin_io_prepare(device, i))
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drbd_al_begin_io_commit(device);
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}
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int drbd_al_begin_io_nonblock(struct drbd_device *device, struct drbd_interval *i)
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{
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struct lru_cache *al = device->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(device, 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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/* Too many activity log extents are currently "hot".
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*
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* If we have accumulated pending changes already,
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* we made progress.
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*
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* If we cannot get even a single pending change through,
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* stop the fast path until we made some progress,
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* or requests to "cold" extents could be starved. */
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if (!al->pending_changes)
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__set_bit(__LC_STARVING, &device->act_log->flags);
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return -ENOBUFS;
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}
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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(device->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(device->act_log, enr);
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if (!al_ext)
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drbd_info(device, "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_device *device, 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(device, first <= last);
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spin_lock_irqsave(&device->al_lock, flags);
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for (enr = first; enr <= last; enr++) {
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extent = lc_find(device->act_log, enr);
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if (!extent) {
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drbd_err(device, "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(device->act_log, extent);
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}
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spin_unlock_irqrestore(&device->al_lock, flags);
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wake_up(&device->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 sector_t al_tr_number_to_on_disk_sector(struct drbd_device *device)
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{
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const unsigned int stripes = device->ldev->md.al_stripes;
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const unsigned int stripe_size_4kB = device->ldev->md.al_stripe_size_4k;
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/* transaction number, modulo on-disk ring buffer wrap around */
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unsigned int t = device->al_tr_number % (device->ldev->md.al_size_4k);
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/* ... to aligned 4k on disk block */
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t = ((t % stripes) * stripe_size_4kB) + t/stripes;
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/* ... to 512 byte sector in activity log */
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t *= 8;
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/* ... plus offset to the on disk position */
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return device->ldev->md.md_offset + device->ldev->md.al_offset + t;
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}
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int al_write_transaction(struct drbd_device *device)
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{
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struct al_transaction_on_disk *buffer;
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struct lc_element *e;
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sector_t sector;
|
|
int i, mx;
|
|
unsigned extent_nr;
|
|
unsigned crc = 0;
|
|
int err = 0;
|
|
|
|
if (!get_ldev(device)) {
|
|
drbd_err(device, "disk is %s, cannot start al transaction\n",
|
|
drbd_disk_str(device->state.disk));
|
|
return -EIO;
|
|
}
|
|
|
|
/* The bitmap write may have failed, causing a state change. */
|
|
if (device->state.disk < D_INCONSISTENT) {
|
|
drbd_err(device,
|
|
"disk is %s, cannot write al transaction\n",
|
|
drbd_disk_str(device->state.disk));
|
|
put_ldev(device);
|
|
return -EIO;
|
|
}
|
|
|
|
/* protects md_io_buffer, al_tr_cycle, ... */
|
|
buffer = drbd_md_get_buffer(device, __func__);
|
|
if (!buffer) {
|
|
drbd_err(device, "disk failed while waiting for md_io buffer\n");
|
|
put_ldev(device);
|
|
return -ENODEV;
|
|
}
|
|
|
|
memset(buffer, 0, sizeof(*buffer));
|
|
buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
|
|
buffer->tr_number = cpu_to_be32(device->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(&device->al_lock);
|
|
list_for_each_entry(e, &device->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(device,
|
|
al_extent_to_bm_page(e->lc_number));
|
|
i++;
|
|
}
|
|
spin_unlock_irq(&device->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(device->act_log->nr_elements);
|
|
buffer->context_start_slot_nr = cpu_to_be16(device->al_tr_cycle);
|
|
|
|
mx = min_t(int, AL_CONTEXT_PER_TRANSACTION,
|
|
device->act_log->nr_elements - device->al_tr_cycle);
|
|
for (i = 0; i < mx; i++) {
|
|
unsigned idx = device->al_tr_cycle + i;
|
|
extent_nr = lc_element_by_index(device->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);
|
|
|
|
device->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION;
|
|
if (device->al_tr_cycle >= device->act_log->nr_elements)
|
|
device->al_tr_cycle = 0;
|
|
|
|
sector = al_tr_number_to_on_disk_sector(device);
|
|
|
|
crc = crc32c(0, buffer, 4096);
|
|
buffer->crc32c = cpu_to_be32(crc);
|
|
|
|
if (drbd_bm_write_hinted(device))
|
|
err = -EIO;
|
|
else {
|
|
bool write_al_updates;
|
|
rcu_read_lock();
|
|
write_al_updates = rcu_dereference(device->ldev->disk_conf)->al_updates;
|
|
rcu_read_unlock();
|
|
if (write_al_updates) {
|
|
if (drbd_md_sync_page_io(device, device->ldev, sector, WRITE)) {
|
|
err = -EIO;
|
|
drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
|
|
} else {
|
|
device->al_tr_number++;
|
|
device->al_writ_cnt++;
|
|
}
|
|
}
|
|
}
|
|
|
|
drbd_md_put_buffer(device);
|
|
put_ldev(device);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int _try_lc_del(struct drbd_device *device, struct lc_element *al_ext)
|
|
{
|
|
int rv;
|
|
|
|
spin_lock_irq(&device->al_lock);
|
|
rv = (al_ext->refcnt == 0);
|
|
if (likely(rv))
|
|
lc_del(device->act_log, al_ext);
|
|
spin_unlock_irq(&device->al_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_al_shrink() - Removes all active extents form the activity log
|
|
* @device: 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 device->act_log with lc_try_lock() / lc_unlock()
|
|
*/
|
|
void drbd_al_shrink(struct drbd_device *device)
|
|
{
|
|
struct lc_element *al_ext;
|
|
int i;
|
|
|
|
D_ASSERT(device, test_bit(__LC_LOCKED, &device->act_log->flags));
|
|
|
|
for (i = 0; i < device->act_log->nr_elements; i++) {
|
|
al_ext = lc_element_by_index(device->act_log, i);
|
|
if (al_ext->lc_number == LC_FREE)
|
|
continue;
|
|
wait_event(device->al_wait, _try_lc_del(device, al_ext));
|
|
}
|
|
|
|
wake_up(&device->al_wait);
|
|
}
|
|
|
|
int drbd_initialize_al(struct drbd_device *device, void *buffer)
|
|
{
|
|
struct al_transaction_on_disk *al = buffer;
|
|
struct drbd_md *md = &device->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(device, device->ldev, al_base + i * 8, WRITE);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const char *drbd_change_sync_fname[] = {
|
|
[RECORD_RS_FAILED] = "drbd_rs_failed_io",
|
|
[SET_IN_SYNC] = "drbd_set_in_sync",
|
|
[SET_OUT_OF_SYNC] = "drbd_set_out_of_sync"
|
|
};
|
|
|
|
/* 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.
|
|
*
|
|
* Adjusts the caching members ->rs_left (success) or ->rs_failed (!success),
|
|
* potentially pulling in (and recounting the corresponding bits)
|
|
* this resync extent into the resync extent lru cache.
|
|
*
|
|
* Returns whether all bits have been cleared for this resync extent,
|
|
* precisely: (rs_left <= rs_failed)
|
|
*
|
|
* TODO will be obsoleted once we have a caching lru of the on disk bitmap
|
|
*/
|
|
static bool update_rs_extent(struct drbd_device *device,
|
|
unsigned int enr, int count,
|
|
enum update_sync_bits_mode mode)
|
|
{
|
|
struct lc_element *e;
|
|
|
|
D_ASSERT(device, atomic_read(&device->local_cnt));
|
|
|
|
/* When setting out-of-sync bits,
|
|
* we don't need it cached (lc_find).
|
|
* But if it is present in the cache,
|
|
* we should update the cached bit count.
|
|
* Otherwise, that extent should be in the resync extent lru cache
|
|
* already -- or we want to pull it in if necessary -- (lc_get),
|
|
* then update and check rs_left and rs_failed. */
|
|
if (mode == SET_OUT_OF_SYNC)
|
|
e = lc_find(device->resync, enr);
|
|
else
|
|
e = lc_get(device->resync, enr);
|
|
if (e) {
|
|
struct bm_extent *ext = lc_entry(e, struct bm_extent, lce);
|
|
if (ext->lce.lc_number == enr) {
|
|
if (mode == SET_IN_SYNC)
|
|
ext->rs_left -= count;
|
|
else if (mode == SET_OUT_OF_SYNC)
|
|
ext->rs_left += count;
|
|
else
|
|
ext->rs_failed += count;
|
|
if (ext->rs_left < ext->rs_failed) {
|
|
drbd_warn(device, "BAD! enr=%u rs_left=%d "
|
|
"rs_failed=%d count=%d cstate=%s\n",
|
|
ext->lce.lc_number, ext->rs_left,
|
|
ext->rs_failed, count,
|
|
drbd_conn_str(device->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(device, 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(device, enr);
|
|
if (ext->flags != 0) {
|
|
drbd_warn(device, "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) {
|
|
drbd_warn(device, "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 = (mode == RECORD_RS_FAILED) ? count : 0;
|
|
/* we don't keep a persistent log of the resync lru,
|
|
* we can commit any change right away. */
|
|
lc_committed(device->resync);
|
|
}
|
|
if (mode != SET_OUT_OF_SYNC)
|
|
lc_put(device->resync, &ext->lce);
|
|
/* no race, we are within the al_lock! */
|
|
|
|
if (ext->rs_left <= ext->rs_failed) {
|
|
ext->rs_failed = 0;
|
|
return true;
|
|
}
|
|
} else if (mode != SET_OUT_OF_SYNC) {
|
|
/* be quiet if lc_find() did not find it. */
|
|
drbd_err(device, "lc_get() failed! locked=%d/%d flags=%lu\n",
|
|
device->resync_locked,
|
|
device->resync->nr_elements,
|
|
device->resync->flags);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void drbd_advance_rs_marks(struct drbd_device *device, unsigned long still_to_go)
|
|
{
|
|
unsigned long now = jiffies;
|
|
unsigned long last = device->rs_mark_time[device->rs_last_mark];
|
|
int next = (device->rs_last_mark + 1) % DRBD_SYNC_MARKS;
|
|
if (time_after_eq(now, last + DRBD_SYNC_MARK_STEP)) {
|
|
if (device->rs_mark_left[device->rs_last_mark] != still_to_go &&
|
|
device->state.conn != C_PAUSED_SYNC_T &&
|
|
device->state.conn != C_PAUSED_SYNC_S) {
|
|
device->rs_mark_time[next] = now;
|
|
device->rs_mark_left[next] = still_to_go;
|
|
device->rs_last_mark = next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* It is called lazy update, so don't do write-out too often. */
|
|
static bool lazy_bitmap_update_due(struct drbd_device *device)
|
|
{
|
|
return time_after(jiffies, device->rs_last_bcast + 2*HZ);
|
|
}
|
|
|
|
static void maybe_schedule_on_disk_bitmap_update(struct drbd_device *device, bool rs_done)
|
|
{
|
|
if (rs_done)
|
|
set_bit(RS_DONE, &device->flags);
|
|
/* and also set RS_PROGRESS below */
|
|
else if (!lazy_bitmap_update_due(device))
|
|
return;
|
|
|
|
drbd_device_post_work(device, RS_PROGRESS);
|
|
}
|
|
|
|
static int update_sync_bits(struct drbd_device *device,
|
|
unsigned long sbnr, unsigned long ebnr,
|
|
enum update_sync_bits_mode mode)
|
|
{
|
|
/*
|
|
* We keep a count of set bits per resync-extent in the ->rs_left
|
|
* caching member, so we need to loop and work within the resync extent
|
|
* alignment. Typically this loop will execute exactly once.
|
|
*/
|
|
unsigned long flags;
|
|
unsigned long count = 0;
|
|
unsigned int cleared = 0;
|
|
while (sbnr <= ebnr) {
|
|
/* set temporary boundary bit number to last bit number within
|
|
* the resync extent of the current start bit number,
|
|
* but cap at provided end bit number */
|
|
unsigned long tbnr = min(ebnr, sbnr | BM_BLOCKS_PER_BM_EXT_MASK);
|
|
unsigned long c;
|
|
|
|
if (mode == RECORD_RS_FAILED)
|
|
/* Only called from drbd_rs_failed_io(), bits
|
|
* supposedly still set. Recount, maybe some
|
|
* of the bits have been successfully cleared
|
|
* by application IO meanwhile.
|
|
*/
|
|
c = drbd_bm_count_bits(device, sbnr, tbnr);
|
|
else if (mode == SET_IN_SYNC)
|
|
c = drbd_bm_clear_bits(device, sbnr, tbnr);
|
|
else /* if (mode == SET_OUT_OF_SYNC) */
|
|
c = drbd_bm_set_bits(device, sbnr, tbnr);
|
|
|
|
if (c) {
|
|
spin_lock_irqsave(&device->al_lock, flags);
|
|
cleared += update_rs_extent(device, BM_BIT_TO_EXT(sbnr), c, mode);
|
|
spin_unlock_irqrestore(&device->al_lock, flags);
|
|
count += c;
|
|
}
|
|
sbnr = tbnr + 1;
|
|
}
|
|
if (count) {
|
|
if (mode == SET_IN_SYNC) {
|
|
unsigned long still_to_go = drbd_bm_total_weight(device);
|
|
bool rs_is_done = (still_to_go <= device->rs_failed);
|
|
drbd_advance_rs_marks(device, still_to_go);
|
|
if (cleared || rs_is_done)
|
|
maybe_schedule_on_disk_bitmap_update(device, rs_is_done);
|
|
} else if (mode == RECORD_RS_FAILED)
|
|
device->rs_failed += count;
|
|
wake_up(&device->al_wait);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/* 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.
|
|
*
|
|
*/
|
|
int __drbd_change_sync(struct drbd_device *device, sector_t sector, int size,
|
|
enum update_sync_bits_mode mode,
|
|
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;
|
|
|
|
/* This would be an empty REQ_FLUSH, be silent. */
|
|
if ((mode == SET_OUT_OF_SYNC) && size == 0)
|
|
return 0;
|
|
|
|
if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_DISCARD_SIZE) {
|
|
drbd_err(device, "%s: sector=%llus size=%d nonsense!\n",
|
|
drbd_change_sync_fname[mode],
|
|
(unsigned long long)sector, size);
|
|
return 0;
|
|
}
|
|
|
|
if (!get_ldev(device))
|
|
return 0; /* no disk, no metadata, no bitmap to manipulate bits in */
|
|
|
|
nr_sectors = drbd_get_capacity(device->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);
|
|
|
|
if (mode == SET_IN_SYNC) {
|
|
/* Round up start sector, round down end sector. We make sure
|
|
* we only clear full, aligned, BM_BLOCK_SIZE 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);
|
|
} else {
|
|
/* We set it out of sync, or record resync failure.
|
|
* Should not round anything here. */
|
|
sbnr = BM_SECT_TO_BIT(sector);
|
|
ebnr = BM_SECT_TO_BIT(esector);
|
|
}
|
|
|
|
count = update_sync_bits(device, sbnr, ebnr, mode);
|
|
out:
|
|
put_ldev(device);
|
|
return count;
|
|
}
|
|
|
|
static
|
|
struct bm_extent *_bme_get(struct drbd_device *device, unsigned int enr)
|
|
{
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int wakeup = 0;
|
|
unsigned long rs_flags;
|
|
|
|
spin_lock_irq(&device->al_lock);
|
|
if (device->resync_locked > device->resync->nr_elements/2) {
|
|
spin_unlock_irq(&device->al_lock);
|
|
return NULL;
|
|
}
|
|
e = lc_get(device->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(device, enr);
|
|
bm_ext->rs_failed = 0;
|
|
lc_committed(device->resync);
|
|
wakeup = 1;
|
|
}
|
|
if (bm_ext->lce.refcnt == 1)
|
|
device->resync_locked++;
|
|
set_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
}
|
|
rs_flags = device->resync->flags;
|
|
spin_unlock_irq(&device->al_lock);
|
|
if (wakeup)
|
|
wake_up(&device->al_wait);
|
|
|
|
if (!bm_ext) {
|
|
if (rs_flags & LC_STARVING)
|
|
drbd_warn(device, "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_device *device, unsigned int enr)
|
|
{
|
|
int rv;
|
|
|
|
spin_lock_irq(&device->al_lock);
|
|
rv = lc_is_used(device->act_log, enr);
|
|
spin_unlock_irq(&device->al_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_begin_io() - Gets an extent in the resync LRU cache and sets it to BME_LOCKED
|
|
* @device: 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_device *device, sector_t sector)
|
|
{
|
|
unsigned int enr = BM_SECT_TO_EXT(sector);
|
|
struct bm_extent *bm_ext;
|
|
int i, sig;
|
|
bool sa;
|
|
|
|
retry:
|
|
sig = wait_event_interruptible(device->al_wait,
|
|
(bm_ext = _bme_get(device, enr)));
|
|
if (sig)
|
|
return -EINTR;
|
|
|
|
if (test_bit(BME_LOCKED, &bm_ext->flags))
|
|
return 0;
|
|
|
|
/* step aside only while we are above c-min-rate; unless disabled. */
|
|
sa = drbd_rs_c_min_rate_throttle(device);
|
|
|
|
for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
|
|
sig = wait_event_interruptible(device->al_wait,
|
|
!_is_in_al(device, enr * AL_EXT_PER_BM_SECT + i) ||
|
|
(sa && test_bit(BME_PRIORITY, &bm_ext->flags)));
|
|
|
|
if (sig || (sa && test_bit(BME_PRIORITY, &bm_ext->flags))) {
|
|
spin_lock_irq(&device->al_lock);
|
|
if (lc_put(device->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0; /* clears BME_NO_WRITES and eventually BME_PRIORITY */
|
|
device->resync_locked--;
|
|
wake_up(&device->al_wait);
|
|
}
|
|
spin_unlock_irq(&device->al_lock);
|
|
if (sig)
|
|
return -EINTR;
|
|
if (schedule_timeout_interruptible(HZ/10))
|
|
return -EINTR;
|
|
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
|
|
* @device: 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_device *device, 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;
|
|
bool throttle = drbd_rs_should_slow_down(device, sector, true);
|
|
|
|
/* If we need to throttle, a half-locked (only marked BME_NO_WRITES,
|
|
* not yet BME_LOCKED) extent needs to be kicked out explicitly if we
|
|
* need to throttle. There is at most one such half-locked extent,
|
|
* which is remembered in resync_wenr. */
|
|
|
|
if (throttle && device->resync_wenr != enr)
|
|
return -EAGAIN;
|
|
|
|
spin_lock_irq(&device->al_lock);
|
|
if (device->resync_wenr != LC_FREE && device->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(device->resync, device->resync_wenr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (bm_ext) {
|
|
D_ASSERT(device, !test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(device, test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
clear_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
device->resync_wenr = LC_FREE;
|
|
if (lc_put(device->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0;
|
|
device->resync_locked--;
|
|
}
|
|
wake_up(&device->al_wait);
|
|
} else {
|
|
drbd_alert(device, "LOGIC BUG\n");
|
|
}
|
|
}
|
|
/* TRY. */
|
|
e = lc_try_get(device->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)) {
|
|
device->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(device, bm_ext->lce.refcnt > 0);
|
|
}
|
|
goto check_al;
|
|
} else {
|
|
/* do we rather want to try later? */
|
|
if (device->resync_locked > device->resync->nr_elements-3)
|
|
goto try_again;
|
|
/* Do or do not. There is no try. -- Yoda */
|
|
e = lc_get(device->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (!bm_ext) {
|
|
const unsigned long rs_flags = device->resync->flags;
|
|
if (rs_flags & LC_STARVING)
|
|
drbd_warn(device, "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(device, enr);
|
|
bm_ext->rs_failed = 0;
|
|
lc_committed(device->resync);
|
|
wake_up(&device->al_wait);
|
|
D_ASSERT(device, test_bit(BME_LOCKED, &bm_ext->flags) == 0);
|
|
}
|
|
set_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
D_ASSERT(device, bm_ext->lce.refcnt == 1);
|
|
device->resync_locked++;
|
|
goto check_al;
|
|
}
|
|
check_al:
|
|
for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
|
|
if (lc_is_used(device->act_log, al_enr+i))
|
|
goto try_again;
|
|
}
|
|
set_bit(BME_LOCKED, &bm_ext->flags);
|
|
proceed:
|
|
device->resync_wenr = LC_FREE;
|
|
spin_unlock_irq(&device->al_lock);
|
|
return 0;
|
|
|
|
try_again:
|
|
if (bm_ext) {
|
|
if (throttle) {
|
|
D_ASSERT(device, !test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(device, test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
clear_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
device->resync_wenr = LC_FREE;
|
|
if (lc_put(device->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0;
|
|
device->resync_locked--;
|
|
}
|
|
wake_up(&device->al_wait);
|
|
} else
|
|
device->resync_wenr = enr;
|
|
}
|
|
spin_unlock_irq(&device->al_lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
void drbd_rs_complete_io(struct drbd_device *device, 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(&device->al_lock, flags);
|
|
e = lc_find(device->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (!bm_ext) {
|
|
spin_unlock_irqrestore(&device->al_lock, flags);
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
drbd_err(device, "drbd_rs_complete_io() called, but extent not found\n");
|
|
return;
|
|
}
|
|
|
|
if (bm_ext->lce.refcnt == 0) {
|
|
spin_unlock_irqrestore(&device->al_lock, flags);
|
|
drbd_err(device, "drbd_rs_complete_io(,%llu [=%u]) called, "
|
|
"but refcnt is 0!?\n",
|
|
(unsigned long long)sector, enr);
|
|
return;
|
|
}
|
|
|
|
if (lc_put(device->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0; /* clear BME_LOCKED, BME_NO_WRITES and BME_PRIORITY */
|
|
device->resync_locked--;
|
|
wake_up(&device->al_wait);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&device->al_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_cancel_all() - Removes all extents from the resync LRU (even BME_LOCKED)
|
|
* @device: DRBD device.
|
|
*/
|
|
void drbd_rs_cancel_all(struct drbd_device *device)
|
|
{
|
|
spin_lock_irq(&device->al_lock);
|
|
|
|
if (get_ldev_if_state(device, D_FAILED)) { /* Makes sure ->resync is there. */
|
|
lc_reset(device->resync);
|
|
put_ldev(device);
|
|
}
|
|
device->resync_locked = 0;
|
|
device->resync_wenr = LC_FREE;
|
|
spin_unlock_irq(&device->al_lock);
|
|
wake_up(&device->al_wait);
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_del_all() - Gracefully remove all extents from the resync LRU
|
|
* @device: DRBD device.
|
|
*
|
|
* Returns 0 upon success, -EAGAIN if at least one reference count was
|
|
* not zero.
|
|
*/
|
|
int drbd_rs_del_all(struct drbd_device *device)
|
|
{
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int i;
|
|
|
|
spin_lock_irq(&device->al_lock);
|
|
|
|
if (get_ldev_if_state(device, D_FAILED)) {
|
|
/* ok, ->resync is there. */
|
|
for (i = 0; i < device->resync->nr_elements; i++) {
|
|
e = lc_element_by_index(device->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 == device->resync_wenr) {
|
|
drbd_info(device, "dropping %u in drbd_rs_del_all, apparently"
|
|
" got 'synced' by application io\n",
|
|
device->resync_wenr);
|
|
D_ASSERT(device, !test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(device, test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
clear_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
device->resync_wenr = LC_FREE;
|
|
lc_put(device->resync, &bm_ext->lce);
|
|
}
|
|
if (bm_ext->lce.refcnt != 0) {
|
|
drbd_info(device, "Retrying drbd_rs_del_all() later. "
|
|
"refcnt=%d\n", bm_ext->lce.refcnt);
|
|
put_ldev(device);
|
|
spin_unlock_irq(&device->al_lock);
|
|
return -EAGAIN;
|
|
}
|
|
D_ASSERT(device, !test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(device, !test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
lc_del(device->resync, &bm_ext->lce);
|
|
}
|
|
D_ASSERT(device, device->resync->used == 0);
|
|
put_ldev(device);
|
|
}
|
|
spin_unlock_irq(&device->al_lock);
|
|
wake_up(&device->al_wait);
|
|
|
|
return 0;
|
|
}
|