[PATCH 15/24] ibnbd: client: private header with client structs and functions

Roman Pen
2018-02-02T14:08:55Z

This header describes main structs and functions used by ibnbd-client
module, mainly for managing IBNBD sessions and mapped block devices,
creating and destroying sysfs entries.

Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Signed-off-by: Danil Kipnis <danil.kipnis@profitbricks.com>
Cc: Jack Wang <jinpu.wang@profitbricks.com>
---
drivers/block/ibnbd/ibnbd-clt.h | 193 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 193 insertions(+)

diff --git a/drivers/block/ibnbd/ibnbd-clt.h b/drivers/block/ibnbd/ibnbd-clt.h
new file mode 100644
index 000000000000..b3d72b2962dd
--- /dev/null
+++ b/drivers/block/ibnbd/ibnbd-clt.h
@@ -0,0 +1,193 @@
+/*
+ * InfiniBand Network Block Driver
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler <mail@fholler.de>
+ * Jack Wang <jinpu.wang@profitbricks.com>
+ * Kleber Souza <kleber.souza@profitbricks.com>
+ * Danil Kipnis <danil.kipnis@profitbricks.com>
+ * Roman Penyaev <roman.penyaev@profitbricks.com>
+ * Milind Dumbare <Milind.dumbare@gmail.com>
+ *
+ * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Authors: Danil Kipnis <danil.kipnis@profitbricks.com>
+ * Roman Penyaev <roman.penyaev@profitbricks.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef IBNBD_CLT_H
+#define IBNBD_CLT_H
+
+#include <linux/wait.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/blk-mq.h>
+#include <linux/refcount.h>
+
+#include "ibtrs.h"
+#include "ibnbd-proto.h"
+#include "ibnbd-log.h"
+
+#define BMAX_SEGMENTS 31
+#define RECONNECT_DELAY 30
+#define MAX_RECONNECTS -1
+
+enum ibnbd_clt_dev_state {
+ DEV_STATE_INIT,
+ DEV_STATE_MAPPED,
+ DEV_STATE_MAPPED_DISCONNECTED,
+ DEV_STATE_UNMAPPED,
+};
+
+enum ibnbd_queue_mode {
+ BLK_MQ,
+ BLK_RQ
+};
+
+struct ibnbd_iu_comp {
+ wait_queue_head_t wait;
+ int errno;
+};
+
+struct ibnbd_iu {
+ union {
+ struct request *rq; /* for block io */
+ void *buf; /* for user messages */
+ };
+ struct ibtrs_tag *tag;
+ union {
+ /* use to send msg associated with a dev */
+ struct ibnbd_clt_dev *dev;
+ /* use to send msg associated with a sess */
+ struct ibnbd_clt_session *sess;
+ };
+ blk_status_t status;
+ struct scatterlist sglist[BMAX_SEGMENTS];
+ struct work_struct work;
+ int errno;
+ struct ibnbd_iu_comp *comp;
+};
+
+struct ibnbd_cpu_qlist {
+ struct list_head requeue_list;
+ spinlock_t requeue_lock;
+ unsigned int cpu;
+};
+
+struct ibnbd_clt_session {
+ struct list_head list;
+ struct ibtrs_clt *ibtrs;
+ wait_queue_head_t ibtrs_waitq;
+ bool ibtrs_ready;
+ struct ibnbd_cpu_qlist __percpu
+ *cpu_queues;
+ DECLARE_BITMAP(cpu_queues_bm, NR_CPUS);
+ int __percpu *cpu_rr; /* per-cpu var for CPU round-robin */
+ atomic_t busy;
+ int queue_depth;
+ u32 max_io_size;
+ struct blk_mq_tag_set tag_set;
+ struct mutex lock; /* protects state and devs_list */
+ struct list_head devs_list; /* list of struct ibnbd_clt_dev */
+ refcount_t refcount;
+ char sessname[NAME_MAX];
+ u8 ver; /* protocol version */
+};
+
+/**
+ * Submission queues.
+ */
+struct ibnbd_queue {
+ struct list_head requeue_list;
+ unsigned long in_list;
+ struct ibnbd_clt_dev *dev;
+ struct blk_mq_hw_ctx *hctx;
+};
+
+struct ibnbd_clt_dev {
+ struct ibnbd_clt_session *sess;
+ struct request_queue *queue;
+ struct ibnbd_queue *hw_queues;
+ struct delayed_work rq_delay_work;
+ u32 device_id;
+ /* local Idr index - used to track minor number allocations. */
+ u32 clt_device_id;
+ struct mutex lock;
+ enum ibnbd_clt_dev_state dev_state;
+ enum ibnbd_queue_mode queue_mode;
+ enum ibnbd_io_mode io_mode; /* user requested */
+ enum ibnbd_io_mode remote_io_mode; /* server really used */
+ char pathname[NAME_MAX];
+ enum ibnbd_access_mode access_mode;
+ bool read_only;
+ bool rotational;
+ u32 max_hw_sectors;
+ u32 max_write_same_sectors;
+ u32 max_discard_sectors;
+ u32 discard_granularity;
+ u32 discard_alignment;
+ u16 secure_discard;
+ u16 physical_block_size;
+ u16 logical_block_size;
+ u16 max_segments;
+ size_t nsectors;
+ u64 size; /* device size in bytes */
+ struct list_head list;
+ struct gendisk *gd;
+ struct kobject kobj;
+ char blk_symlink_name[NAME_MAX];
+ refcount_t refcount;
+ struct work_struct unmap_on_rmmod_work;
+};
+
+static inline const char *ibnbd_queue_mode_str(enum ibnbd_queue_mode mode)
+{
+ switch (mode) {
+ case BLK_RQ:
+ return "rq";
+ case BLK_MQ:
+ return "mq";
+ default:
+ return "unknown";
+ }
+}
+
+/* ibnbd-clt.c */
+
+struct ibnbd_clt_dev *ibnbd_clt_map_device(const char *sessname,
+ struct ibtrs_addr *paths,
+ size_t path_cnt,
+ const char *pathname,
+ enum ibnbd_access_mode access_mode,
+ enum ibnbd_queue_mode queue_mode,
+ enum ibnbd_io_mode io_mode);
+int ibnbd_clt_unmap_device(struct ibnbd_clt_dev *dev, bool force,
+ const struct attribute *sysfs_self);
+
+int ibnbd_clt_remap_device(struct ibnbd_clt_dev *dev);
+int ibnbd_clt_resize_disk(struct ibnbd_clt_dev *dev, size_t newsize);
+
+/* ibnbd-clt-sysfs.c */
+
+int ibnbd_clt_create_sysfs_files(void);
+
+void ibnbd_clt_destroy_sysfs_files(void);
+void ibnbd_clt_destroy_default_group(void);
+
+void ibnbd_clt_remove_dev_symlink(struct ibnbd_clt_dev *dev);
+void ibnbd_sysfs_remove_file_self(struct kobject *kobj,
+ const struct attribute *attr);
+
+#endif /* IBNBD_CLT_H */
--
2.13.1