Merge tag 'ceph-for-4.12-rc1' of git://github.com/ceph/ceph-client

Pull ceph updates from Ilya Dryomov:
 "The two main items are support for disabling automatic rbd exclusive
  lock transfers from myself and the long awaited -ENOSPC handling
  series from Jeff.

  The former will allow rbd users to take advantage of exclusive lock's
  built-in blacklist/break-lock functionality while staying in control
  of who owns the lock. With the latter in place, we will abort
  filesystem writes on -ENOSPC instead of having them block
  indefinitely.

  Beyond that we've got the usual pile of filesystem fixes from Zheng,
  some refcount_t conversion patches from Elena and a patch for an
  ancient open() flags handling bug from Alexander"

* tag 'ceph-for-4.12-rc1' of git://github.com/ceph/ceph-client: (31 commits)
  ceph: fix memory leak in __ceph_setxattr()
  ceph: fix file open flags on ppc64
  ceph: choose readdir frag based on previous readdir reply
  rbd: exclusive map option
  rbd: return ResponseMessage result from rbd_handle_request_lock()
  rbd: kill rbd_is_lock_supported()
  rbd: support updating the lock cookie without releasing the lock
  rbd: store lock cookie
  rbd: ignore unlock errors
  rbd: fix error handling around rbd_init_disk()
  rbd: move rbd_unregister_watch() call into rbd_dev_image_release()
  rbd: move rbd_dev_destroy() call out of rbd_dev_image_release()
  ceph: when seeing write errors on an inode, switch to sync writes
  Revert "ceph: SetPageError() for writeback pages if writepages fails"
  ceph: handle epoch barriers in cap messages
  libceph: add an epoch_barrier field to struct ceph_osd_client
  libceph: abort already submitted but abortable requests when map or pool goes full
  libceph: allow requests to return immediately on full conditions if caller wishes
  libceph: remove req->r_replay_version
  ceph: make seeky readdir more efficient
  ...

6 files changed, 198 insertions, 34 deletions

diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 4eb773ccce11..4fd02831beed 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -45,6 +45,17 @@ bool libceph_compatible(void *data)
 }
 EXPORT_SYMBOL(libceph_compatible);
 
+static int param_get_supported_features(char *buffer,
+					const struct kernel_param *kp)
+{
+	return sprintf(buffer, "0x%llx", CEPH_FEATURES_SUPPORTED_DEFAULT);
+}
+static const struct kernel_param_ops param_ops_supported_features = {
+	.get = param_get_supported_features,
+};
+module_param_cb(supported_features, &param_ops_supported_features, NULL,
+		S_IRUGO);
+
 /*
  * find filename portion of a path (/foo/bar/baz -> baz)
  */
@@ -596,9 +607,7 @@ EXPORT_SYMBOL(ceph_client_gid);
 /*
  * create a fresh client instance
  */
-struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private,
-				       u64 supported_features,
-				       u64 required_features)
+struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
 {
 	struct ceph_client *client;
 	struct ceph_entity_addr *myaddr = NULL;
@@ -615,14 +624,12 @@ struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private,
 	init_waitqueue_head(&client->auth_wq);
 	client->auth_err = 0;
 
-	if (!ceph_test_opt(client, NOMSGAUTH))
-		required_features |= CEPH_FEATURE_MSG_AUTH;
-
 	client->extra_mon_dispatch = NULL;
-	client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT |
-		supported_features;
-	client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT |
-		required_features;
+	client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT;
+	client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT;
+
+	if (!ceph_test_opt(client, NOMSGAUTH))
+		client->required_features |= CEPH_FEATURE_MSG_AUTH;
 
 	/* msgr */
 	if (ceph_test_opt(client, MYIP))
diff --git a/net/ceph/cls_lock_client.c b/net/ceph/cls_lock_client.c
index b9233b990399..08ada893f01e 100644
--- a/net/ceph/cls_lock_client.c
+++ b/net/ceph/cls_lock_client.c
@@ -179,6 +179,57 @@ int ceph_cls_break_lock(struct ceph_osd_client *osdc,
 }
 EXPORT_SYMBOL(ceph_cls_break_lock);
 
+int ceph_cls_set_cookie(struct ceph_osd_client *osdc,
+			struct ceph_object_id *oid,
+			struct ceph_object_locator *oloc,
+			char *lock_name, u8 type, char *old_cookie,
+			char *tag, char *new_cookie)
+{
+	int cookie_op_buf_size;
+	int name_len = strlen(lock_name);
+	int old_cookie_len = strlen(old_cookie);
+	int tag_len = strlen(tag);
+	int new_cookie_len = strlen(new_cookie);
+	void *p, *end;
+	struct page *cookie_op_page;
+	int ret;
+
+	cookie_op_buf_size = name_len + sizeof(__le32) +
+			     old_cookie_len + sizeof(__le32) +
+			     tag_len + sizeof(__le32) +
+			     new_cookie_len + sizeof(__le32) +
+			     sizeof(u8) + CEPH_ENCODING_START_BLK_LEN;
+	if (cookie_op_buf_size > PAGE_SIZE)
+		return -E2BIG;
+
+	cookie_op_page = alloc_page(GFP_NOIO);
+	if (!cookie_op_page)
+		return -ENOMEM;
+
+	p = page_address(cookie_op_page);
+	end = p + cookie_op_buf_size;
+
+	/* encode cls_lock_set_cookie_op struct */
+	ceph_start_encoding(&p, 1, 1,
+			    cookie_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
+	ceph_encode_string(&p, end, lock_name, name_len);
+	ceph_encode_8(&p, type);
+	ceph_encode_string(&p, end, old_cookie, old_cookie_len);
+	ceph_encode_string(&p, end, tag, tag_len);
+	ceph_encode_string(&p, end, new_cookie, new_cookie_len);
+
+	dout("%s lock_name %s type %d old_cookie %s tag %s new_cookie %s\n",
+	     __func__, lock_name, type, old_cookie, tag, new_cookie);
+	ret = ceph_osdc_call(osdc, oid, oloc, "lock", "set_cookie",
+			     CEPH_OSD_FLAG_WRITE, cookie_op_page,
+			     cookie_op_buf_size, NULL, NULL);
+
+	dout("%s: status %d\n", __func__, ret);
+	__free_page(cookie_op_page);
+	return ret;
+}
+EXPORT_SYMBOL(ceph_cls_set_cookie);
+
 void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers)
 {
 	int i;
diff --git a/net/ceph/debugfs.c b/net/ceph/debugfs.c
index c62b2b029a6e..71ba13927b3d 100644
--- a/net/ceph/debugfs.c
+++ b/net/ceph/debugfs.c
@@ -62,7 +62,8 @@ static int osdmap_show(struct seq_file *s, void *p)
 		return 0;
 
 	down_read(&osdc->lock);
-	seq_printf(s, "epoch %d flags 0x%x\n", map->epoch, map->flags);
+	seq_printf(s, "epoch %u barrier %u flags 0x%x\n", map->epoch,
+			osdc->epoch_barrier, map->flags);
 
 	for (n = rb_first(&map->pg_pools); n; n = rb_next(n)) {
 		struct ceph_pg_pool_info *pi =
@@ -177,9 +178,7 @@ static void dump_request(struct seq_file *s, struct ceph_osd_request *req)
 	seq_printf(s, "%llu\t", req->r_tid);
 	dump_target(s, &req->r_t);
 
-	seq_printf(s, "\t%d\t%u'%llu", req->r_attempts,
-		   le32_to_cpu(req->r_replay_version.epoch),
-		   le64_to_cpu(req->r_replay_version.version));
+	seq_printf(s, "\t%d", req->r_attempts);
 
 	for (i = 0; i < req->r_num_ops; i++) {
 		struct ceph_osd_req_op *op = &req->r_ops[i];
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 242d7c0d92f8..924f07c36ddb 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -961,6 +961,7 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 				       truncate_size, truncate_seq);
 	}
 
+	req->r_abort_on_full = true;
 	req->r_flags = flags;
 	req->r_base_oloc.pool = layout->pool_id;
 	req->r_base_oloc.pool_ns = ceph_try_get_string(layout->pool_ns);
@@ -1005,7 +1006,7 @@ static bool osd_registered(struct ceph_osd *osd)
  */
 static void osd_init(struct ceph_osd *osd)
 {
-	atomic_set(&osd->o_ref, 1);
+	refcount_set(&osd->o_ref, 1);
 	RB_CLEAR_NODE(&osd->o_node);
 	osd->o_requests = RB_ROOT;
 	osd->o_linger_requests = RB_ROOT;
@@ -1050,9 +1051,9 @@ static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
 
 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 {
-	if (atomic_inc_not_zero(&osd->o_ref)) {
-		dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
-		     atomic_read(&osd->o_ref));
+	if (refcount_inc_not_zero(&osd->o_ref)) {
+		dout("get_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref)-1,
+		     refcount_read(&osd->o_ref));
 		return osd;
 	} else {
 		dout("get_osd %p FAIL\n", osd);
@@ -1062,9 +1063,9 @@ static struct ceph_osd *get_osd(struct ceph_osd *osd)
 
 static void put_osd(struct ceph_osd *osd)
 {
-	dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
-	     atomic_read(&osd->o_ref) - 1);
-	if (atomic_dec_and_test(&osd->o_ref)) {
+	dout("put_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref),
+	     refcount_read(&osd->o_ref) - 1);
+	if (refcount_dec_and_test(&osd->o_ref)) {
 		osd_cleanup(osd);
 		kfree(osd);
 	}
@@ -1297,8 +1298,9 @@ static bool target_should_be_paused(struct ceph_osd_client *osdc,
 		       __pool_full(pi);
 
 	WARN_ON(pi->id != t->base_oloc.pool);
-	return (t->flags & CEPH_OSD_FLAG_READ && pauserd) ||
-	       (t->flags & CEPH_OSD_FLAG_WRITE && pausewr);
+	return ((t->flags & CEPH_OSD_FLAG_READ) && pauserd) ||
+	       ((t->flags & CEPH_OSD_FLAG_WRITE) && pausewr) ||
+	       (osdc->osdmap->epoch < osdc->epoch_barrier);
 }
 
 enum calc_target_result {
@@ -1503,9 +1505,10 @@ static void encode_request(struct ceph_osd_request *req, struct ceph_msg *msg)
 	ceph_encode_32(&p, req->r_flags);
 	ceph_encode_timespec(p, &req->r_mtime);
 	p += sizeof(struct ceph_timespec);
-	/* aka reassert_version */
-	memcpy(p, &req->r_replay_version, sizeof(req->r_replay_version));
-	p += sizeof(req->r_replay_version);
+
+	/* reassert_version */
+	memset(p, 0, sizeof(struct ceph_eversion));
+	p += sizeof(struct ceph_eversion);
 
 	/* oloc */
 	ceph_start_encoding(&p, 5, 4,
@@ -1626,6 +1629,7 @@ static void maybe_request_map(struct ceph_osd_client *osdc)
 		ceph_monc_renew_subs(&osdc->client->monc);
 }
 
+static void complete_request(struct ceph_osd_request *req, int err);
 static void send_map_check(struct ceph_osd_request *req);
 
 static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
@@ -1635,6 +1639,7 @@ static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
 	enum calc_target_result ct_res;
 	bool need_send = false;
 	bool promoted = false;
+	bool need_abort = false;
 
 	WARN_ON(req->r_tid);
 	dout("%s req %p wrlocked %d\n", __func__, req, wrlocked);
@@ -1650,8 +1655,13 @@ again:
 		goto promote;
 	}
 
-	if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
-	    ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
+	if (osdc->osdmap->epoch < osdc->epoch_barrier) {
+		dout("req %p epoch %u barrier %u\n", req, osdc->osdmap->epoch,
+		     osdc->epoch_barrier);
+		req->r_t.paused = true;
+		maybe_request_map(osdc);
+	} else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
+		   ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
 		dout("req %p pausewr\n", req);
 		req->r_t.paused = true;
 		maybe_request_map(osdc);
@@ -1669,6 +1679,8 @@ again:
 		pr_warn_ratelimited("FULL or reached pool quota\n");
 		req->r_t.paused = true;
 		maybe_request_map(osdc);
+		if (req->r_abort_on_full)
+			need_abort = true;
 	} else if (!osd_homeless(osd)) {
 		need_send = true;
 	} else {
@@ -1685,6 +1697,8 @@ again:
 	link_request(osd, req);
 	if (need_send)
 		send_request(req);
+	else if (need_abort)
+		complete_request(req, -ENOSPC);
 	mutex_unlock(&osd->lock);
 
 	if (ct_res == CALC_TARGET_POOL_DNE)
@@ -1799,6 +1813,97 @@ static void abort_request(struct ceph_osd_request *req, int err)
 	complete_request(req, err);
 }
 
+static void update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
+{
+	if (likely(eb > osdc->epoch_barrier)) {
+		dout("updating epoch_barrier from %u to %u\n",
+				osdc->epoch_barrier, eb);
+		osdc->epoch_barrier = eb;
+		/* Request map if we're not to the barrier yet */
+		if (eb > osdc->osdmap->epoch)
+			maybe_request_map(osdc);
+	}
+}
+
+void ceph_osdc_update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
+{
+	down_read(&osdc->lock);
+	if (unlikely(eb > osdc->epoch_barrier)) {
+		up_read(&osdc->lock);
+		down_write(&osdc->lock);
+		update_epoch_barrier(osdc, eb);
+		up_write(&osdc->lock);
+	} else {
+		up_read(&osdc->lock);
+	}
+}
+EXPORT_SYMBOL(ceph_osdc_update_epoch_barrier);
+
+/*
+ * Drop all pending requests that are stalled waiting on a full condition to
+ * clear, and complete them with ENOSPC as the return code. Set the
+ * osdc->epoch_barrier to the latest map epoch that we've seen if any were
+ * cancelled.
+ */
+static void ceph_osdc_abort_on_full(struct ceph_osd_client *osdc)
+{
+	struct rb_node *n;
+	bool victims = false;
+
+	dout("enter abort_on_full\n");
+
+	if (!ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && !have_pool_full(osdc))
+		goto out;
+
+	/* Scan list and see if there is anything to abort */
+	for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
+		struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
+		struct rb_node *m;
+
+		m = rb_first(&osd->o_requests);
+		while (m) {
+			struct ceph_osd_request *req = rb_entry(m,
+					struct ceph_osd_request, r_node);
+			m = rb_next(m);
+
+			if (req->r_abort_on_full) {
+				victims = true;
+				break;
+			}
+		}
+		if (victims)
+			break;
+	}
+
+	if (!victims)
+		goto out;
+
+	/*
+	 * Update the barrier to current epoch if it's behind that point,
+	 * since we know we have some calls to be aborted in the tree.
+	 */
+	update_epoch_barrier(osdc, osdc->osdmap->epoch);
+
+	for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
+		struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
+		struct rb_node *m;
+
+		m = rb_first(&osd->o_requests);
+		while (m) {
+			struct ceph_osd_request *req = rb_entry(m,
+					struct ceph_osd_request, r_node);
+			m = rb_next(m);
+
+			if (req->r_abort_on_full &&
+			    (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
+			     pool_full(osdc, req->r_t.target_oloc.pool)))
+				abort_request(req, -ENOSPC);
+		}
+	}
+out:
+	dout("return abort_on_full barrier=%u\n", osdc->epoch_barrier);
+}
+
 static void check_pool_dne(struct ceph_osd_request *req)
 {
 	struct ceph_osd_client *osdc = req->r_osdc;
@@ -3252,11 +3357,13 @@ done:
 	pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
 		  ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
 		  have_pool_full(osdc);
-	if (was_pauserd || was_pausewr || pauserd || pausewr)
+	if (was_pauserd || was_pausewr || pauserd || pausewr ||
+	    osdc->osdmap->epoch < osdc->epoch_barrier)
 		maybe_request_map(osdc);
 
 	kick_requests(osdc, &need_resend, &need_resend_linger);
 
+	ceph_osdc_abort_on_full(osdc);
 	ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
 			  osdc->osdmap->epoch);
 	up_write(&osdc->lock);
@@ -4126,7 +4233,7 @@ void ceph_osdc_stop(struct ceph_osd_client *osdc)
 		close_osd(osd);
 	}
 	up_write(&osdc->lock);
-	WARN_ON(atomic_read(&osdc->homeless_osd.o_ref) != 1);
+	WARN_ON(refcount_read(&osdc->homeless_osd.o_ref) != 1);
 	osd_cleanup(&osdc->homeless_osd);
 
 	WARN_ON(!list_empty(&osdc->osd_lru));
diff --git a/net/ceph/pagelist.c b/net/ceph/pagelist.c
index 6864007e64fc..ce09f73be759 100644
--- a/net/ceph/pagelist.c
+++ b/net/ceph/pagelist.c
@@ -16,7 +16,7 @@ static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl)
 
 void ceph_pagelist_release(struct ceph_pagelist *pl)
 {
-	if (!atomic_dec_and_test(&pl->refcnt))
+	if (!refcount_dec_and_test(&pl->refcnt))
 		return;
 	ceph_pagelist_unmap_tail(pl);
 	while (!list_empty(&pl->head)) {
diff --git a/net/ceph/snapshot.c b/net/ceph/snapshot.c
index 705414e78ae0..e14a5d038656 100644
--- a/net/ceph/snapshot.c
+++ b/net/ceph/snapshot.c
@@ -49,7 +49,7 @@ struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
 	if (!snapc)
 		return NULL;
 
-	atomic_set(&snapc->nref, 1);
+	refcount_set(&snapc->nref, 1);
 	snapc->num_snaps = snap_count;
 
 	return snapc;
@@ -59,7 +59,7 @@ EXPORT_SYMBOL(ceph_create_snap_context);
 struct ceph_snap_context *ceph_get_snap_context(struct ceph_snap_context *sc)
 {
 	if (sc)
-		atomic_inc(&sc->nref);
+		refcount_inc(&sc->nref);
 	return sc;
 }
 EXPORT_SYMBOL(ceph_get_snap_context);
@@ -68,7 +68,7 @@ void ceph_put_snap_context(struct ceph_snap_context *sc)
 {
 	if (!sc)
 		return;
-	if (atomic_dec_and_test(&sc->nref)) {
+	if (refcount_dec_and_test(&sc->nref)) {
 		/*printk(" deleting snap_context %p\n", sc);*/
 		kfree(sc);
 	}