forked from luck/tmp_suning_uos_patched
drbd: Removed the BIO_RW_BARRIER support form the receiver/epoch code
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
parent
8825f7c3e5
commit
2451fc3b2b
@ -749,17 +749,12 @@ struct drbd_epoch {
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/* drbd_epoch flag bits */
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enum {
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DE_BARRIER_IN_NEXT_EPOCH_ISSUED,
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DE_BARRIER_IN_NEXT_EPOCH_DONE,
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DE_CONTAINS_A_BARRIER,
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DE_HAVE_BARRIER_NUMBER,
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DE_IS_FINISHING,
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};
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enum epoch_event {
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EV_PUT,
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EV_GOT_BARRIER_NR,
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EV_BARRIER_DONE,
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EV_BECAME_LAST,
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EV_CLEANUP = 32, /* used as flag */
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};
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@ -801,11 +796,6 @@ enum {
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__EE_CALL_AL_COMPLETE_IO,
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__EE_MAY_SET_IN_SYNC,
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/* This epoch entry closes an epoch using a barrier.
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* On sucessful completion, the epoch is released,
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* and the P_BARRIER_ACK send. */
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__EE_IS_BARRIER,
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/* In case a barrier failed,
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* we need to resubmit without the barrier flag. */
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__EE_RESUBMITTED,
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@ -820,7 +810,6 @@ enum {
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};
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#define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO)
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#define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC)
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#define EE_IS_BARRIER (1<<__EE_IS_BARRIER)
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#define EE_RESUBMITTED (1<<__EE_RESUBMITTED)
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#define EE_WAS_ERROR (1<<__EE_WAS_ERROR)
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#define EE_HAS_DIGEST (1<<__EE_HAS_DIGEST)
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@ -948,7 +937,6 @@ enum write_ordering_e {
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WO_none,
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WO_drain_io,
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WO_bdev_flush,
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WO_bio_barrier
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};
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struct fifo_buffer {
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@ -2858,7 +2858,7 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
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drbd_thread_init(mdev, &mdev->asender, drbd_asender);
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mdev->agreed_pro_version = PRO_VERSION_MAX;
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mdev->write_ordering = WO_bio_barrier;
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mdev->write_ordering = WO_bdev_flush;
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mdev->resync_wenr = LC_FREE;
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}
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@ -1117,8 +1117,8 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
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nbc = NULL;
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resync_lru = NULL;
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mdev->write_ordering = WO_bio_barrier;
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drbd_bump_write_ordering(mdev, WO_bio_barrier);
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mdev->write_ordering = WO_bdev_flush;
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drbd_bump_write_ordering(mdev, WO_bdev_flush);
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if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
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set_bit(CRASHED_PRIMARY, &mdev->flags);
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@ -158,7 +158,6 @@ static int drbd_seq_show(struct seq_file *seq, void *v)
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[WO_none] = 'n',
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[WO_drain_io] = 'd',
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[WO_bdev_flush] = 'f',
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[WO_bio_barrier] = 'b',
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};
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seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
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@ -49,11 +49,6 @@
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#include "drbd_vli.h"
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struct flush_work {
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struct drbd_work w;
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struct drbd_epoch *epoch;
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};
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enum finish_epoch {
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FE_STILL_LIVE,
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FE_DESTROYED,
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@ -66,16 +61,6 @@ static int drbd_do_auth(struct drbd_conf *mdev);
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static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event);
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static int e_end_block(struct drbd_conf *, struct drbd_work *, int);
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static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
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{
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struct drbd_epoch *prev;
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spin_lock(&mdev->epoch_lock);
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prev = list_entry(epoch->list.prev, struct drbd_epoch, list);
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if (prev == epoch || prev == mdev->current_epoch)
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prev = NULL;
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spin_unlock(&mdev->epoch_lock);
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return prev;
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}
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#define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
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@ -981,7 +966,7 @@ static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsi
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return TRUE;
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}
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static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
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static void drbd_flush(struct drbd_conf *mdev)
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{
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int rv;
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@ -997,24 +982,6 @@ static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct d
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}
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put_ldev(mdev);
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}
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return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
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}
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static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
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{
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struct flush_work *fw = (struct flush_work *)w;
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struct drbd_epoch *epoch = fw->epoch;
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kfree(w);
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if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags))
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drbd_flush_after_epoch(mdev, epoch);
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drbd_may_finish_epoch(mdev, epoch, EV_PUT |
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(mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0));
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return 1;
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}
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/**
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@ -1027,15 +994,13 @@ static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
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struct drbd_epoch *epoch,
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enum epoch_event ev)
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{
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int finish, epoch_size;
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int epoch_size;
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struct drbd_epoch *next_epoch;
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int schedule_flush = 0;
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enum finish_epoch rv = FE_STILL_LIVE;
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spin_lock(&mdev->epoch_lock);
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do {
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next_epoch = NULL;
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finish = 0;
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epoch_size = atomic_read(&epoch->epoch_size);
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@ -1045,16 +1010,6 @@ static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
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break;
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case EV_GOT_BARRIER_NR:
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set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags);
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/* Special case: If we just switched from WO_bio_barrier to
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WO_bdev_flush we should not finish the current epoch */
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if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 &&
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mdev->write_ordering != WO_bio_barrier &&
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epoch == mdev->current_epoch)
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clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags);
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break;
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case EV_BARRIER_DONE:
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set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags);
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break;
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case EV_BECAME_LAST:
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/* nothing to do*/
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@ -1063,23 +1018,7 @@ static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
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if (epoch_size != 0 &&
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atomic_read(&epoch->active) == 0 &&
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test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) &&
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epoch->list.prev == &mdev->current_epoch->list &&
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!test_bit(DE_IS_FINISHING, &epoch->flags)) {
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/* Nearly all conditions are met to finish that epoch... */
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if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) ||
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mdev->write_ordering == WO_none ||
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(epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) ||
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ev & EV_CLEANUP) {
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finish = 1;
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set_bit(DE_IS_FINISHING, &epoch->flags);
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} else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) &&
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mdev->write_ordering == WO_bio_barrier) {
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atomic_inc(&epoch->active);
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schedule_flush = 1;
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}
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}
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if (finish) {
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test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) {
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if (!(ev & EV_CLEANUP)) {
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spin_unlock(&mdev->epoch_lock);
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drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size);
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@ -1102,6 +1041,7 @@ static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
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/* atomic_set(&epoch->active, 0); is already zero */
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if (rv == FE_STILL_LIVE)
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rv = FE_RECYCLED;
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wake_up(&mdev->ee_wait);
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}
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}
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@ -1113,22 +1053,6 @@ static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
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spin_unlock(&mdev->epoch_lock);
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if (schedule_flush) {
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struct flush_work *fw;
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fw = kmalloc(sizeof(*fw), GFP_ATOMIC);
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if (fw) {
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fw->w.cb = w_flush;
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fw->epoch = epoch;
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drbd_queue_work(&mdev->data.work, &fw->w);
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} else {
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dev_warn(DEV, "Could not kmalloc a flush_work obj\n");
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set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
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/* That is not a recursion, only one level */
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drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
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drbd_may_finish_epoch(mdev, epoch, EV_PUT);
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}
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}
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return rv;
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}
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@ -1144,19 +1068,16 @@ void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo)
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[WO_none] = "none",
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[WO_drain_io] = "drain",
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[WO_bdev_flush] = "flush",
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[WO_bio_barrier] = "barrier",
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};
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pwo = mdev->write_ordering;
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wo = min(pwo, wo);
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if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier)
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wo = WO_bdev_flush;
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if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush)
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wo = WO_drain_io;
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if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain)
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wo = WO_none;
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mdev->write_ordering = wo;
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if (pwo != mdev->write_ordering || wo == WO_bio_barrier)
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if (pwo != mdev->write_ordering || wo == WO_bdev_flush)
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dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]);
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}
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@ -1192,7 +1113,7 @@ int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
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bio->bi_sector = sector;
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bio->bi_bdev = mdev->ldev->backing_bdev;
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/* we special case some flags in the multi-bio case, see below
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* (REQ_UNPLUG, REQ_HARDBARRIER) */
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* (REQ_UNPLUG) */
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bio->bi_rw = rw;
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bio->bi_private = e;
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bio->bi_end_io = drbd_endio_sec;
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@ -1226,11 +1147,6 @@ int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
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bio->bi_rw &= ~REQ_UNPLUG;
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drbd_generic_make_request(mdev, fault_type, bio);
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/* strip off REQ_HARDBARRIER,
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* unless it is the first or last bio */
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if (bios && bios->bi_next)
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bios->bi_rw &= ~REQ_HARDBARRIER;
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} while (bios);
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maybe_kick_lo(mdev);
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return 0;
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@ -1244,45 +1160,9 @@ int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
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return -ENOMEM;
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}
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/**
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* w_e_reissue() - Worker callback; Resubmit a bio, without REQ_HARDBARRIER set
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* @mdev: DRBD device.
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* @w: work object.
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* @cancel: The connection will be closed anyways (unused in this callback)
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*/
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int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local)
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{
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struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
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/* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place,
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(and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch)
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so that we can finish that epoch in drbd_may_finish_epoch().
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That is necessary if we already have a long chain of Epochs, before
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we realize that REQ_HARDBARRIER is actually not supported */
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/* As long as the -ENOTSUPP on the barrier is reported immediately
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that will never trigger. If it is reported late, we will just
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print that warning and continue correctly for all future requests
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with WO_bdev_flush */
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if (previous_epoch(mdev, e->epoch))
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dev_warn(DEV, "Write ordering was not enforced (one time event)\n");
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/* we still have a local reference,
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* get_ldev was done in receive_Data. */
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e->w.cb = e_end_block;
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if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_DT_WR) != 0) {
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/* drbd_submit_ee fails for one reason only:
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* if was not able to allocate sufficient bios.
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* requeue, try again later. */
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e->w.cb = w_e_reissue;
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drbd_queue_work(&mdev->data.work, &e->w);
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}
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return 1;
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}
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static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
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{
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int rv, issue_flush;
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int rv;
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struct p_barrier *p = &mdev->data.rbuf.barrier;
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struct drbd_epoch *epoch;
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@ -1300,44 +1180,40 @@ static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsign
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* Therefore we must send the barrier_ack after the barrier request was
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* completed. */
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switch (mdev->write_ordering) {
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case WO_bio_barrier:
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case WO_none:
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if (rv == FE_RECYCLED)
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return TRUE;
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break;
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/* receiver context, in the writeout path of the other node.
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* avoid potential distributed deadlock */
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epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
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if (epoch)
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break;
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else
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dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
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/* Fall through */
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case WO_bdev_flush:
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case WO_drain_io:
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if (rv == FE_STILL_LIVE) {
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set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
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drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
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rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
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}
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if (rv == FE_RECYCLED)
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return TRUE;
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/* The asender will send all the ACKs and barrier ACKs out, since
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all EEs moved from the active_ee to the done_ee. We need to
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provide a new epoch object for the EEs that come in soon */
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break;
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}
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/* receiver context, in the writeout path of the other node.
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* avoid potential distributed deadlock */
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epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
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if (!epoch) {
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dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
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issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
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drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
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if (issue_flush) {
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rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
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if (rv == FE_RECYCLED)
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return TRUE;
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drbd_flush(mdev);
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if (atomic_read(&mdev->current_epoch->epoch_size)) {
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epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
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if (epoch)
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break;
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}
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drbd_wait_ee_list_empty(mdev, &mdev->done_ee);
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epoch = mdev->current_epoch;
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wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0);
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D_ASSERT(atomic_read(&epoch->active) == 0);
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D_ASSERT(epoch->flags == 0);
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return TRUE;
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default:
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dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering);
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return FALSE;
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}
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epoch->flags = 0;
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@ -1652,15 +1528,8 @@ static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
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{
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struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
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sector_t sector = e->sector;
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struct drbd_epoch *epoch;
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int ok = 1, pcmd;
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if (e->flags & EE_IS_BARRIER) {
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epoch = previous_epoch(mdev, e->epoch);
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if (epoch)
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drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0));
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}
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if (mdev->net_conf->wire_protocol == DRBD_PROT_C) {
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if (likely((e->flags & EE_WAS_ERROR) == 0)) {
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pcmd = (mdev->state.conn >= C_SYNC_SOURCE &&
|
||||
@ -1817,27 +1686,6 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
|
||||
e->epoch = mdev->current_epoch;
|
||||
atomic_inc(&e->epoch->epoch_size);
|
||||
atomic_inc(&e->epoch->active);
|
||||
|
||||
if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) {
|
||||
struct drbd_epoch *epoch;
|
||||
/* Issue a barrier if we start a new epoch, and the previous epoch
|
||||
was not a epoch containing a single request which already was
|
||||
a Barrier. */
|
||||
epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list);
|
||||
if (epoch == e->epoch) {
|
||||
set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
|
||||
rw |= REQ_HARDBARRIER;
|
||||
e->flags |= EE_IS_BARRIER;
|
||||
} else {
|
||||
if (atomic_read(&epoch->epoch_size) > 1 ||
|
||||
!test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) {
|
||||
set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
|
||||
set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
|
||||
rw |= REQ_HARDBARRIER;
|
||||
e->flags |= EE_IS_BARRIER;
|
||||
}
|
||||
}
|
||||
}
|
||||
spin_unlock(&mdev->epoch_lock);
|
||||
|
||||
dp_flags = be32_to_cpu(p->dp_flags);
|
||||
|
@ -102,12 +102,6 @@ void drbd_endio_read_sec_final(struct drbd_epoch_entry *e) __releases(local)
|
||||
put_ldev(mdev);
|
||||
}
|
||||
|
||||
static int is_failed_barrier(int ee_flags)
|
||||
{
|
||||
return (ee_flags & (EE_IS_BARRIER|EE_WAS_ERROR|EE_RESUBMITTED))
|
||||
== (EE_IS_BARRIER|EE_WAS_ERROR);
|
||||
}
|
||||
|
||||
/* writes on behalf of the partner, or resync writes,
|
||||
* "submitted" by the receiver, final stage. */
|
||||
static void drbd_endio_write_sec_final(struct drbd_epoch_entry *e) __releases(local)
|
||||
@ -119,21 +113,6 @@ static void drbd_endio_write_sec_final(struct drbd_epoch_entry *e) __releases(lo
|
||||
int is_syncer_req;
|
||||
int do_al_complete_io;
|
||||
|
||||
/* if this is a failed barrier request, disable use of barriers,
|
||||
* and schedule for resubmission */
|
||||
if (is_failed_barrier(e->flags)) {
|
||||
drbd_bump_write_ordering(mdev, WO_bdev_flush);
|
||||
spin_lock_irqsave(&mdev->req_lock, flags);
|
||||
list_del(&e->w.list);
|
||||
e->flags = (e->flags & ~EE_WAS_ERROR) | EE_RESUBMITTED;
|
||||
e->w.cb = w_e_reissue;
|
||||
/* put_ldev actually happens below, once we come here again. */
|
||||
__release(local);
|
||||
spin_unlock_irqrestore(&mdev->req_lock, flags);
|
||||
drbd_queue_work(&mdev->data.work, &e->w);
|
||||
return;
|
||||
}
|
||||
|
||||
D_ASSERT(e->block_id != ID_VACANT);
|
||||
|
||||
/* after we moved e to done_ee,
|
||||
|
Loading…
Reference in New Issue
Block a user