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-rw-r--r--xlators/cluster/nsr-server/src/all-templates.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/xlators/cluster/nsr-server/src/all-templates.c b/xlators/cluster/nsr-server/src/all-templates.c
new file mode 100644
index 000000000..fa29de7b2
--- /dev/null
+++ b/xlators/cluster/nsr-server/src/all-templates.c
@@ -0,0 +1,345 @@
+/*
+ * You can put anything here - it doesn't even have to be a comment - and it
+ * will be ignored until we reach the first template-name comment.
+ */
+
+
+// template-name read-fop
+$TYPE$
+nsr_$NAME$ (call_frame_t *frame, xlator_t *this,
+ $ARGS_LONG$)
+{
+ nsr_private_t *priv = this->private;
+ gf_boolean_t in_recon = _gf_false;
+ int32_t recon_term, recon_index;
+
+ // allow reads during reconciliation
+ // TBD: allow "dirty" reads on non-leaders
+ if (xdata &&
+ (dict_get_int32(xdata, RECON_TERM_XATTR, &recon_term) == 0) &&
+ (dict_get_int32(xdata, RECON_INDEX_XATTR, &recon_index) == 0)) {
+ in_recon = _gf_true;
+ }
+
+ if ((!priv->leader) && (in_recon == _gf_false)) {
+ goto err;
+ }
+
+ STACK_WIND (frame, default_$NAME$_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->$NAME$,
+ $ARGS_SHORT$);
+ return 0;
+
+err:
+ STACK_UNWIND_STRICT ($NAME$, frame, -1, EREMOTE,
+ $DEFAULTS$);
+ return 0;
+}
+
+// template-name read-dispatch
+/* No "dispatch" function needed for $NAME$ */
+
+// template-name read-fan-in
+/* No "fan-in" function needed for $NAME$ */
+
+// template-name read-continue
+/* No "continue" function needed for $NAME$ */
+
+// template-name read-complete
+/* No "complete" function needed for $NAME$ */
+
+// template-name write-fop
+$TYPE$
+nsr_$NAME$ (call_frame_t *frame, xlator_t *this,
+ $ARGS_LONG$)
+{
+ nsr_local_t *local = NULL;
+ nsr_private_t *priv = this->private;
+ int op_errno = ENOMEM;
+ int from_leader;
+ int from_recon;
+ uint32_t ti = 0;
+ double must_be_up;
+ double are_up;
+
+ /*
+ * Our first goal here is to avoid "split brain surprise" for users who
+ * specify exactly 50% with two- or three-way replication. That means
+ * either a more-than check against half the total replicas or an
+ * at-least check against half of our peers (one less). Of the two,
+ * only an at-least check supports the intuitive use of 100% to mean
+ * all replicas must be present, because "more than 100%" will never
+ * succeed regardless of which count we use. This leaves us with a
+ * slightly non-traditional definition of quorum ("at least X% of peers
+ * not including ourselves") but one that's useful enough to be worth
+ * it.
+ *
+ * Note that n_children and up_children *do* include the local
+ * subvolume, so we need to subtract one in each case.
+ */
+ must_be_up = ((double)(priv->n_children - 1)) * priv->quorum_pct;
+ are_up = ((double)(priv->up_children - 1)) * 100.0;
+ if (are_up < must_be_up) {
+ /* Emulate the AFR client-side-quorum behavior. */
+ op_errno = EROFS;
+ goto err;
+ }
+
+ local = mem_get0(this->local_pool);
+ if (!local) {
+ goto err;
+ }
+#if defined(NSR_CG_NEED_FD)
+ local->fd = fd_ref(fd);
+#else
+ local->fd = NULL;
+#endif
+ INIT_LIST_HEAD(&local->qlinks);
+ frame->local = local;
+
+ if (xdata) {
+ from_leader = !!dict_get(xdata,NSR_TERM_XATTR);
+ from_recon = !!dict_get(xdata,RECON_TERM_XATTR)
+ && !!dict_get(xdata,RECON_INDEX_XATTR);
+ }
+ else {
+ from_leader = from_recon = _gf_false;
+ }
+
+ // follower/recon path
+ // just send it to local node
+ if (from_leader || from_recon) {
+ atomic_inc(&priv->ops_in_flight);
+ STACK_WIND (frame, nsr_$NAME$_complete,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->$NAME$,
+ $ARGS_SHORT$);
+ return 0;
+ }
+
+
+ if (!priv->leader/* || priv->fence_io*/) {
+ op_errno = EREMOTE;
+ goto err;
+ }
+
+
+ if (!xdata) {
+ xdata = dict_new();
+ if (!xdata) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "failed to allocate xdata");
+ goto err;
+ }
+ }
+
+ if (dict_set_int32(xdata,NSR_TERM_XATTR,priv->current_term) != 0) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "failed to set nsr-term");
+ goto err;
+ }
+
+ LOCK(&priv->index_lock);
+ ti = ++(priv->index);
+ UNLOCK(&priv->index_lock);
+ if (dict_set_int32(xdata,NSR_INDEX_XATTR,ti) != 0) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "failed to set index");
+ goto err;
+ }
+
+ local->stub = fop_$NAME$_stub (frame,nsr_$NAME$_continue,
+ $ARGS_SHORT$);
+ if (!local->stub) {
+ goto err;
+ }
+
+
+#if defined(NSR_CG_QUEUE)
+ nsr_inode_ctx_t *ictx = nsr_get_inode_ctx(this,fd->inode);
+ if (!ictx) {
+ op_errno = EIO;
+ goto err;
+ }
+ LOCK(&ictx->lock);
+ if (ictx->active) {
+ gf_log (this->name, GF_LOG_DEBUG,
+ "queuing request due to conflict");
+ /*
+ * TBD: enqueue only for real conflict
+ *
+ * Currently we just act like all writes are in
+ * conflict with one another. What we should really do
+ * is check the active/pending queues and defer only if
+ * there's a conflict there.
+ *
+ * It's important to check the pending queue because we
+ * might have an active request X which conflicts with
+ * a pending request Y, and this request Z might
+ * conflict with Y but not X. If we checked only the
+ * active queue then Z could jump ahead of Y, which
+ * would be incorrect.
+ */
+ local->qstub = fop_$NAME$_stub (frame,
+ nsr_$NAME$_dispatch,
+ $ARGS_SHORT$);
+ if (!local->qstub) {
+ UNLOCK(&ictx->lock);
+ goto err;
+ }
+ list_add_tail(&local->qlinks,&ictx->pqueue);
+ ++(ictx->pending);
+ UNLOCK(&ictx->lock);
+ return 0;
+ }
+ else {
+ list_add_tail(&local->qlinks,&ictx->aqueue);
+ ++(ictx->active);
+ }
+ UNLOCK(&ictx->lock);
+#endif
+
+ return nsr_$NAME$_dispatch (frame, this, $ARGS_SHORT$);
+
+err:
+ if (local) {
+ if (local->stub) {
+ call_stub_destroy(local->stub);
+ }
+ if (local->qstub) {
+ call_stub_destroy(local->qstub);
+ }
+ if (local->fd) {
+ fd_unref(local->fd);
+ }
+ mem_put(local);
+ }
+ STACK_UNWIND_STRICT ($NAME$, frame, -1, op_errno,
+ $DEFAULTS$);
+ return 0;
+}
+
+// template-name write-dispatch
+$TYPE$
+nsr_$NAME$_dispatch (call_frame_t *frame, xlator_t *this,
+ $ARGS_LONG$)
+{
+ nsr_local_t *local = frame->local;
+ nsr_private_t *priv = this->private;
+ xlator_list_t *trav;
+
+ atomic_inc(&priv->ops_in_flight);
+
+ /*
+ * TBD: unblock pending request(s) if we fail after this point but
+ * before we get to nsr_$NAME$_complete (where that code currently
+ * resides).
+ */
+
+ local->call_count = priv->n_children - 1;
+ for (trav = this->children->next; trav; trav = trav->next) {
+ STACK_WIND (frame, nsr_$NAME$_fan_in,
+ trav->xlator, trav->xlator->fops->$NAME$,
+ $ARGS_SHORT$);
+ }
+
+ // TBD: variable Issue count
+ return 0;
+}
+
+// template-name write-fan-in
+$TYPE$
+nsr_$NAME$_fan_in (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ $ARGS_LONG$)
+{
+ nsr_local_t *local = frame->local;
+ uint8_t call_count;
+
+ gf_log (this->name, GF_LOG_TRACE,
+ "op_ret = %d, op_errno = %d\n", op_ret, op_errno);
+
+ LOCK(&frame->lock);
+ call_count = --(local->call_count);
+ UNLOCK(&frame->lock);
+
+ // TBD: variable Completion count
+ if (call_count == 0) {
+ call_resume(local->stub);
+ }
+
+ return 0;
+}
+
+// template-name write-continue
+$TYPE$
+nsr_$NAME$_continue (call_frame_t *frame, xlator_t *this,
+ $ARGS_LONG$)
+{
+ STACK_WIND (frame, nsr_$NAME$_complete,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->$NAME$,
+ $ARGS_SHORT$);
+ return 0;
+}
+
+// template-name write-complete
+$TYPE$
+nsr_$NAME$_complete (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ $ARGS_LONG$)
+{
+ nsr_private_t *priv = this->private;
+#if defined(NSR_CG_NEED_FD)
+ nsr_local_t *local = frame->local;
+#endif
+
+#if defined(NSR_CG_QUEUE)
+ nsr_inode_ctx_t *ictx;
+ nsr_local_t *next;
+ if (local->qlinks.next != &local->qlinks) {
+ list_del(&local->qlinks);
+ ictx = nsr_get_inode_ctx(this,local->fd->inode);
+ if (ictx) {
+ LOCK(&ictx->lock);
+ if (ictx->pending) {
+ /*
+ * TBD: dequeue *all* non-conflicting reqs
+ *
+ * With the stub implementation there can only
+ * be one request active at a time (zero here)
+ * so it's not an issue. In a real
+ * implementation there might still be other
+ * active requests to check against, and
+ * multiple pending requests that could
+ * continue.
+ */
+ gf_log (this->name, GF_LOG_DEBUG,
+ "unblocking next request");
+ --(ictx->pending);
+ next = list_entry (ictx->pqueue.next,
+ nsr_local_t, qlinks);
+ list_del(&next->qlinks);
+ list_add_tail(&next->qlinks,&ictx->aqueue);
+ call_resume(next->qstub);
+ }
+ else {
+ --(ictx->active);
+ }
+ UNLOCK(&ictx->lock);
+ }
+ }
+#endif
+
+#if defined(NSR_CG_FSYNC)
+ nsr_mark_fd_dirty(this,local);
+#endif
+
+#if defined(NSR_CG_NEED_FD)
+ fd_unref(local->fd);
+#endif
+
+ STACK_UNWIND_STRICT ($NAME$, frame, op_ret, op_errno,
+ $ARGS_SHORT$);
+ atomic_dec(&priv->ops_in_flight);
+ return 0;
+
+}
generated by cgit (git 2.34.1) at 2024-04-16 21:55:16 +0000