1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * RDMA Network Block Driver
5 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
6 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
7 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
10 #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
12 #include <linux/module.h>
13 #include <linux/blkdev.h>
16 #include "rnbd-srv-dev.h"
18 MODULE_DESCRIPTION("RDMA Network Block Device Server");
19 MODULE_LICENSE("GPL");
21 static u16 port_nr = RTRS_PORT;
23 module_param_named(port_nr, port_nr, ushort, 0444);
24 MODULE_PARM_DESC(port_nr,
25 "The port number the server is listening on (default: "
26 __stringify(RTRS_PORT)")");
28 #define DEFAULT_DEV_SEARCH_PATH "/"
30 static char dev_search_path[PATH_MAX] = DEFAULT_DEV_SEARCH_PATH;
32 static int dev_search_path_set(const char *val, const struct kernel_param *kp)
34 const char *p = strrchr(val, '\n') ? : val + strlen(val);
36 if (strlen(val) >= sizeof(dev_search_path))
39 snprintf(dev_search_path, sizeof(dev_search_path), "%.*s",
42 pr_info("dev_search_path changed to '%s'\n", dev_search_path);
47 static struct kparam_string dev_search_path_kparam_str = {
48 .maxlen = sizeof(dev_search_path),
49 .string = dev_search_path
52 static const struct kernel_param_ops dev_search_path_ops = {
53 .set = dev_search_path_set,
54 .get = param_get_string,
57 module_param_cb(dev_search_path, &dev_search_path_ops,
58 &dev_search_path_kparam_str, 0444);
59 MODULE_PARM_DESC(dev_search_path,
60 "Sets the dev_search_path. When a device is mapped this path is prepended to the device path from the map device operation. If %SESSNAME% is specified in a path, then device will be searched in a session namespace. (default: "
61 DEFAULT_DEV_SEARCH_PATH ")");
63 static DEFINE_MUTEX(sess_lock);
64 static DEFINE_SPINLOCK(dev_lock);
66 static LIST_HEAD(sess_list);
67 static LIST_HEAD(dev_list);
69 struct rnbd_io_private {
70 struct rtrs_srv_op *id;
71 struct rnbd_srv_sess_dev *sess_dev;
74 static void rnbd_sess_dev_release(struct kref *kref)
76 struct rnbd_srv_sess_dev *sess_dev;
78 sess_dev = container_of(kref, struct rnbd_srv_sess_dev, kref);
79 complete(sess_dev->destroy_comp);
82 static inline void rnbd_put_sess_dev(struct rnbd_srv_sess_dev *sess_dev)
84 kref_put(&sess_dev->kref, rnbd_sess_dev_release);
87 void rnbd_endio(void *priv, int error)
89 struct rnbd_io_private *rnbd_priv = priv;
90 struct rnbd_srv_sess_dev *sess_dev = rnbd_priv->sess_dev;
92 rnbd_put_sess_dev(sess_dev);
94 rtrs_srv_resp_rdma(rnbd_priv->id, error);
99 static struct rnbd_srv_sess_dev *
100 rnbd_get_sess_dev(int dev_id, struct rnbd_srv_session *srv_sess)
102 struct rnbd_srv_sess_dev *sess_dev;
106 sess_dev = xa_load(&srv_sess->index_idr, dev_id);
108 ret = kref_get_unless_zero(&sess_dev->kref);
111 if (!sess_dev || !ret)
112 return ERR_PTR(-ENXIO);
117 static int process_rdma(struct rnbd_srv_session *srv_sess,
118 struct rtrs_srv_op *id, void *data, u32 datalen,
119 const void *usr, size_t usrlen)
121 const struct rnbd_msg_io *msg = usr;
122 struct rnbd_io_private *priv;
123 struct rnbd_srv_sess_dev *sess_dev;
126 struct rnbd_dev_blk_io *io;
130 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
134 dev_id = le32_to_cpu(msg->device_id);
136 sess_dev = rnbd_get_sess_dev(dev_id, srv_sess);
137 if (IS_ERR(sess_dev)) {
138 pr_err_ratelimited("Got I/O request on session %s for unknown device id %d\n",
139 srv_sess->sessname, dev_id);
144 priv->sess_dev = sess_dev;
147 /* Generate bio with pages pointing to the rdma buffer */
148 bio = rnbd_bio_map_kern(data, sess_dev->rnbd_dev->ibd_bio_set, datalen, GFP_KERNEL);
151 rnbd_srv_err(sess_dev, "Failed to generate bio, err: %d\n", err);
155 io = container_of(bio, struct rnbd_dev_blk_io, bio);
156 io->dev = sess_dev->rnbd_dev;
159 bio->bi_end_io = rnbd_dev_bi_end_io;
160 bio->bi_private = io;
161 bio->bi_opf = rnbd_to_bio_flags(le32_to_cpu(msg->rw));
162 bio->bi_iter.bi_sector = le64_to_cpu(msg->sector);
163 bio->bi_iter.bi_size = le32_to_cpu(msg->bi_size);
164 prio = srv_sess->ver < RNBD_PROTO_VER_MAJOR ||
165 usrlen < sizeof(*msg) ? 0 : le16_to_cpu(msg->prio);
166 bio_set_prio(bio, prio);
167 bio_set_dev(bio, sess_dev->rnbd_dev->bdev);
174 rnbd_put_sess_dev(sess_dev);
180 static void destroy_device(struct kref *kref)
182 struct rnbd_srv_dev *dev = container_of(kref, struct rnbd_srv_dev, kref);
184 WARN_ONCE(!list_empty(&dev->sess_dev_list),
185 "Device %s is being destroyed but still in use!\n",
188 spin_lock(&dev_lock);
189 list_del(&dev->list);
190 spin_unlock(&dev_lock);
192 mutex_destroy(&dev->lock);
193 if (dev->dev_kobj.state_in_sysfs)
195 * Destroy kobj only if it was really created.
197 rnbd_srv_destroy_dev_sysfs(dev);
202 static void rnbd_put_srv_dev(struct rnbd_srv_dev *dev)
204 kref_put(&dev->kref, destroy_device);
207 void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id)
209 DECLARE_COMPLETION_ONSTACK(dc);
212 /* free the resources for the id but don't */
213 /* allow to re-use the id itself because it */
214 /* is still used by the client */
215 xa_cmpxchg(&sess_dev->sess->index_idr, sess_dev->device_id,
218 xa_erase(&sess_dev->sess->index_idr, sess_dev->device_id);
221 sess_dev->destroy_comp = &dc;
222 rnbd_put_sess_dev(sess_dev);
223 wait_for_completion(&dc); /* wait for inflights to drop to zero */
225 rnbd_dev_close(sess_dev->rnbd_dev);
226 list_del(&sess_dev->sess_list);
227 mutex_lock(&sess_dev->dev->lock);
228 list_del(&sess_dev->dev_list);
229 if (sess_dev->open_flags & FMODE_WRITE)
230 sess_dev->dev->open_write_cnt--;
231 mutex_unlock(&sess_dev->dev->lock);
233 rnbd_put_srv_dev(sess_dev->dev);
235 rnbd_srv_info(sess_dev, "Device closed\n");
239 static void destroy_sess(struct rnbd_srv_session *srv_sess)
241 struct rnbd_srv_sess_dev *sess_dev, *tmp;
243 if (list_empty(&srv_sess->sess_dev_list))
246 mutex_lock(&srv_sess->lock);
247 list_for_each_entry_safe(sess_dev, tmp, &srv_sess->sess_dev_list,
249 rnbd_srv_destroy_dev_session_sysfs(sess_dev);
250 mutex_unlock(&srv_sess->lock);
253 xa_destroy(&srv_sess->index_idr);
254 bioset_exit(&srv_sess->sess_bio_set);
256 pr_info("RTRS Session %s disconnected\n", srv_sess->sessname);
258 mutex_lock(&sess_lock);
259 list_del(&srv_sess->list);
260 mutex_unlock(&sess_lock);
262 mutex_destroy(&srv_sess->lock);
266 static int create_sess(struct rtrs_srv_sess *rtrs)
268 struct rnbd_srv_session *srv_sess;
269 char pathname[NAME_MAX];
272 err = rtrs_srv_get_path_name(rtrs, pathname, sizeof(pathname));
274 pr_err("rtrs_srv_get_path_name(%s): %d\n", pathname, err);
278 srv_sess = kzalloc(sizeof(*srv_sess), GFP_KERNEL);
282 srv_sess->queue_depth = rtrs_srv_get_queue_depth(rtrs);
283 err = bioset_init(&srv_sess->sess_bio_set, srv_sess->queue_depth,
284 offsetof(struct rnbd_dev_blk_io, bio),
287 pr_err("Allocating srv_session for path %s failed\n",
293 xa_init_flags(&srv_sess->index_idr, XA_FLAGS_ALLOC);
294 INIT_LIST_HEAD(&srv_sess->sess_dev_list);
295 mutex_init(&srv_sess->lock);
296 mutex_lock(&sess_lock);
297 list_add(&srv_sess->list, &sess_list);
298 mutex_unlock(&sess_lock);
300 srv_sess->rtrs = rtrs;
301 strscpy(srv_sess->sessname, pathname, sizeof(srv_sess->sessname));
303 rtrs_srv_set_sess_priv(rtrs, srv_sess);
308 static int rnbd_srv_link_ev(struct rtrs_srv_sess *rtrs,
309 enum rtrs_srv_link_ev ev, void *priv)
311 struct rnbd_srv_session *srv_sess = priv;
314 case RTRS_SRV_LINK_EV_CONNECTED:
315 return create_sess(rtrs);
317 case RTRS_SRV_LINK_EV_DISCONNECTED:
318 if (WARN_ON_ONCE(!srv_sess))
321 destroy_sess(srv_sess);
325 pr_warn("Received unknown RTRS session event %d from session %s\n",
326 ev, srv_sess->sessname);
331 void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev,
332 struct kobj_attribute *attr)
334 struct rnbd_srv_session *sess = sess_dev->sess;
336 sess_dev->keep_id = true;
337 /* It is already started to close by client's close message. */
338 if (!mutex_trylock(&sess->lock))
340 /* first remove sysfs itself to avoid deadlock */
341 sysfs_remove_file_self(&sess_dev->kobj, &attr->attr);
342 rnbd_srv_destroy_dev_session_sysfs(sess_dev);
343 mutex_unlock(&sess->lock);
346 static int process_msg_close(struct rnbd_srv_session *srv_sess,
347 void *data, size_t datalen, const void *usr,
350 const struct rnbd_msg_close *close_msg = usr;
351 struct rnbd_srv_sess_dev *sess_dev;
353 sess_dev = rnbd_get_sess_dev(le32_to_cpu(close_msg->device_id),
355 if (IS_ERR(sess_dev))
358 rnbd_put_sess_dev(sess_dev);
359 mutex_lock(&srv_sess->lock);
360 rnbd_srv_destroy_dev_session_sysfs(sess_dev);
361 mutex_unlock(&srv_sess->lock);
365 static int process_msg_open(struct rnbd_srv_session *srv_sess,
366 const void *msg, size_t len,
367 void *data, size_t datalen);
369 static int process_msg_sess_info(struct rnbd_srv_session *srv_sess,
370 const void *msg, size_t len,
371 void *data, size_t datalen);
373 static int rnbd_srv_rdma_ev(void *priv,
374 struct rtrs_srv_op *id, int dir,
375 void *data, size_t datalen, const void *usr,
378 struct rnbd_srv_session *srv_sess = priv;
379 const struct rnbd_msg_hdr *hdr = usr;
383 if (WARN_ON_ONCE(!srv_sess))
386 type = le16_to_cpu(hdr->type);
390 return process_rdma(srv_sess, id, data, datalen, usr, usrlen);
392 ret = process_msg_close(srv_sess, data, datalen, usr, usrlen);
395 ret = process_msg_open(srv_sess, usr, usrlen, data, datalen);
397 case RNBD_MSG_SESS_INFO:
398 ret = process_msg_sess_info(srv_sess, usr, usrlen, data,
402 pr_warn("Received unexpected message type %d with dir %d from session %s\n",
403 type, dir, srv_sess->sessname);
407 rtrs_srv_resp_rdma(id, ret);
411 static struct rnbd_srv_sess_dev
412 *rnbd_sess_dev_alloc(struct rnbd_srv_session *srv_sess)
414 struct rnbd_srv_sess_dev *sess_dev;
417 sess_dev = kzalloc(sizeof(*sess_dev), GFP_KERNEL);
419 return ERR_PTR(-ENOMEM);
421 error = xa_alloc(&srv_sess->index_idr, &sess_dev->device_id, sess_dev,
422 xa_limit_32b, GFP_NOWAIT);
424 pr_warn("Allocating idr failed, err: %d\n", error);
426 return ERR_PTR(error);
432 static struct rnbd_srv_dev *rnbd_srv_init_srv_dev(const char *id)
434 struct rnbd_srv_dev *dev;
436 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
438 return ERR_PTR(-ENOMEM);
440 strscpy(dev->id, id, sizeof(dev->id));
441 kref_init(&dev->kref);
442 INIT_LIST_HEAD(&dev->sess_dev_list);
443 mutex_init(&dev->lock);
448 static struct rnbd_srv_dev *
449 rnbd_srv_find_or_add_srv_dev(struct rnbd_srv_dev *new_dev)
451 struct rnbd_srv_dev *dev;
453 spin_lock(&dev_lock);
454 list_for_each_entry(dev, &dev_list, list) {
455 if (!strncmp(dev->id, new_dev->id, sizeof(dev->id))) {
456 if (!kref_get_unless_zero(&dev->kref))
458 * We lost the race, device is almost dead.
459 * Continue traversing to find a valid one.
462 spin_unlock(&dev_lock);
466 list_add(&new_dev->list, &dev_list);
467 spin_unlock(&dev_lock);
472 static int rnbd_srv_check_update_open_perm(struct rnbd_srv_dev *srv_dev,
473 struct rnbd_srv_session *srv_sess,
474 enum rnbd_access_mode access_mode)
478 mutex_lock(&srv_dev->lock);
480 switch (access_mode) {
485 if (srv_dev->open_write_cnt == 0) {
486 srv_dev->open_write_cnt++;
489 pr_err("Mapping device '%s' for session %s with RW permissions failed. Device already opened as 'RW' by %d client(s), access mode %s.\n",
490 srv_dev->id, srv_sess->sessname,
491 srv_dev->open_write_cnt,
492 rnbd_access_mode_str(access_mode));
495 case RNBD_ACCESS_MIGRATION:
496 if (srv_dev->open_write_cnt < 2) {
497 srv_dev->open_write_cnt++;
500 pr_err("Mapping device '%s' for session %s with migration permissions failed. Device already opened as 'RW' by %d client(s), access mode %s.\n",
501 srv_dev->id, srv_sess->sessname,
502 srv_dev->open_write_cnt,
503 rnbd_access_mode_str(access_mode));
507 pr_err("Received mapping request for device '%s' on session %s with invalid access mode: %d\n",
508 srv_dev->id, srv_sess->sessname, access_mode);
512 mutex_unlock(&srv_dev->lock);
517 static struct rnbd_srv_dev *
518 rnbd_srv_get_or_create_srv_dev(struct rnbd_dev *rnbd_dev,
519 struct rnbd_srv_session *srv_sess,
520 enum rnbd_access_mode access_mode)
523 struct rnbd_srv_dev *new_dev, *dev;
525 new_dev = rnbd_srv_init_srv_dev(rnbd_dev->name);
529 dev = rnbd_srv_find_or_add_srv_dev(new_dev);
533 ret = rnbd_srv_check_update_open_perm(dev, srv_sess, access_mode);
535 rnbd_put_srv_dev(dev);
542 static void rnbd_srv_fill_msg_open_rsp(struct rnbd_msg_open_rsp *rsp,
543 struct rnbd_srv_sess_dev *sess_dev)
545 struct rnbd_dev *rnbd_dev = sess_dev->rnbd_dev;
546 struct request_queue *q = bdev_get_queue(rnbd_dev->bdev);
548 rsp->hdr.type = cpu_to_le16(RNBD_MSG_OPEN_RSP);
550 cpu_to_le32(sess_dev->device_id);
552 cpu_to_le64(get_capacity(rnbd_dev->bdev->bd_disk));
553 rsp->logical_block_size =
554 cpu_to_le16(bdev_logical_block_size(rnbd_dev->bdev));
555 rsp->physical_block_size =
556 cpu_to_le16(bdev_physical_block_size(rnbd_dev->bdev));
558 cpu_to_le16(rnbd_dev_get_max_segs(rnbd_dev));
559 rsp->max_hw_sectors =
560 cpu_to_le32(rnbd_dev_get_max_hw_sects(rnbd_dev));
561 rsp->max_write_same_sectors =
562 cpu_to_le32(bdev_write_same(rnbd_dev->bdev));
563 rsp->max_discard_sectors =
564 cpu_to_le32(rnbd_dev_get_max_discard_sects(rnbd_dev));
565 rsp->discard_granularity =
566 cpu_to_le32(rnbd_dev_get_discard_granularity(rnbd_dev));
567 rsp->discard_alignment =
568 cpu_to_le32(rnbd_dev_get_discard_alignment(rnbd_dev));
569 rsp->secure_discard =
570 cpu_to_le16(rnbd_dev_get_secure_discard(rnbd_dev));
571 rsp->rotational = !blk_queue_nonrot(q);
572 rsp->cache_policy = 0;
573 if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
574 rsp->cache_policy |= RNBD_WRITEBACK;
575 if (blk_queue_fua(q))
576 rsp->cache_policy |= RNBD_FUA;
579 static struct rnbd_srv_sess_dev *
580 rnbd_srv_create_set_sess_dev(struct rnbd_srv_session *srv_sess,
581 const struct rnbd_msg_open *open_msg,
582 struct rnbd_dev *rnbd_dev, fmode_t open_flags,
583 struct rnbd_srv_dev *srv_dev)
585 struct rnbd_srv_sess_dev *sdev = rnbd_sess_dev_alloc(srv_sess);
590 kref_init(&sdev->kref);
592 strscpy(sdev->pathname, open_msg->dev_name, sizeof(sdev->pathname));
594 sdev->rnbd_dev = rnbd_dev;
595 sdev->sess = srv_sess;
597 sdev->open_flags = open_flags;
598 sdev->access_mode = open_msg->access_mode;
603 static char *rnbd_srv_get_full_path(struct rnbd_srv_session *srv_sess,
604 const char *dev_name)
609 full_path = kmalloc(PATH_MAX, GFP_KERNEL);
611 return ERR_PTR(-ENOMEM);
614 * Replace %SESSNAME% with a real session name in order to
615 * create device namespace.
617 a = strnstr(dev_search_path, "%SESSNAME%", sizeof(dev_search_path));
619 int len = a - dev_search_path;
621 len = snprintf(full_path, PATH_MAX, "%.*s/%s/%s", len,
622 dev_search_path, srv_sess->sessname, dev_name);
623 if (len >= PATH_MAX) {
624 pr_err("Too long path: %s, %s, %s\n",
625 dev_search_path, srv_sess->sessname, dev_name);
627 return ERR_PTR(-EINVAL);
630 snprintf(full_path, PATH_MAX, "%s/%s",
631 dev_search_path, dev_name);
634 /* eliminitate duplicated slashes */
635 a = strchr(full_path, '/');
638 if (*b == '/' && *a == '/') {
652 static int process_msg_sess_info(struct rnbd_srv_session *srv_sess,
653 const void *msg, size_t len,
654 void *data, size_t datalen)
656 const struct rnbd_msg_sess_info *sess_info_msg = msg;
657 struct rnbd_msg_sess_info_rsp *rsp = data;
659 srv_sess->ver = min_t(u8, sess_info_msg->ver, RNBD_PROTO_VER_MAJOR);
660 pr_debug("Session %s using protocol version %d (client version: %d, server version: %d)\n",
661 srv_sess->sessname, srv_sess->ver,
662 sess_info_msg->ver, RNBD_PROTO_VER_MAJOR);
664 rsp->hdr.type = cpu_to_le16(RNBD_MSG_SESS_INFO_RSP);
665 rsp->ver = srv_sess->ver;
671 * find_srv_sess_dev() - a dev is already opened by this name
672 * @srv_sess: the session to search.
673 * @dev_name: string containing the name of the device.
675 * Return struct rnbd_srv_sess_dev if srv_sess already opened the dev_name
676 * NULL if the session didn't open the device yet.
678 static struct rnbd_srv_sess_dev *
679 find_srv_sess_dev(struct rnbd_srv_session *srv_sess, const char *dev_name)
681 struct rnbd_srv_sess_dev *sess_dev;
683 if (list_empty(&srv_sess->sess_dev_list))
686 list_for_each_entry(sess_dev, &srv_sess->sess_dev_list, sess_list)
687 if (!strcmp(sess_dev->pathname, dev_name))
693 static int process_msg_open(struct rnbd_srv_session *srv_sess,
694 const void *msg, size_t len,
695 void *data, size_t datalen)
698 struct rnbd_srv_dev *srv_dev;
699 struct rnbd_srv_sess_dev *srv_sess_dev;
700 const struct rnbd_msg_open *open_msg = msg;
703 struct rnbd_dev *rnbd_dev;
704 struct rnbd_msg_open_rsp *rsp = data;
706 pr_debug("Open message received: session='%s' path='%s' access_mode=%d\n",
707 srv_sess->sessname, open_msg->dev_name,
708 open_msg->access_mode);
709 open_flags = FMODE_READ;
710 if (open_msg->access_mode != RNBD_ACCESS_RO)
711 open_flags |= FMODE_WRITE;
713 mutex_lock(&srv_sess->lock);
715 srv_sess_dev = find_srv_sess_dev(srv_sess, open_msg->dev_name);
719 if ((strlen(dev_search_path) + strlen(open_msg->dev_name))
721 pr_err("Opening device for session %s failed, device path too long. '%s/%s' is longer than PATH_MAX (%d)\n",
722 srv_sess->sessname, dev_search_path, open_msg->dev_name,
727 if (strstr(open_msg->dev_name, "..")) {
728 pr_err("Opening device for session %s failed, device path %s contains relative path ..\n",
729 srv_sess->sessname, open_msg->dev_name);
733 full_path = rnbd_srv_get_full_path(srv_sess, open_msg->dev_name);
734 if (IS_ERR(full_path)) {
735 ret = PTR_ERR(full_path);
736 pr_err("Opening device '%s' for client %s failed, failed to get device full path, err: %d\n",
737 open_msg->dev_name, srv_sess->sessname, ret);
741 rnbd_dev = rnbd_dev_open(full_path, open_flags,
742 &srv_sess->sess_bio_set);
743 if (IS_ERR(rnbd_dev)) {
744 pr_err("Opening device '%s' on session %s failed, failed to open the block device, err: %ld\n",
745 full_path, srv_sess->sessname, PTR_ERR(rnbd_dev));
746 ret = PTR_ERR(rnbd_dev);
750 srv_dev = rnbd_srv_get_or_create_srv_dev(rnbd_dev, srv_sess,
751 open_msg->access_mode);
752 if (IS_ERR(srv_dev)) {
753 pr_err("Opening device '%s' on session %s failed, creating srv_dev failed, err: %ld\n",
754 full_path, srv_sess->sessname, PTR_ERR(srv_dev));
755 ret = PTR_ERR(srv_dev);
759 srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg,
760 rnbd_dev, open_flags,
762 if (IS_ERR(srv_sess_dev)) {
763 pr_err("Opening device '%s' on session %s failed, creating sess_dev failed, err: %ld\n",
764 full_path, srv_sess->sessname, PTR_ERR(srv_sess_dev));
765 ret = PTR_ERR(srv_sess_dev);
769 /* Create the srv_dev sysfs files if they haven't been created yet. The
770 * reason to delay the creation is not to create the sysfs files before
771 * we are sure the device can be opened.
773 mutex_lock(&srv_dev->lock);
774 if (!srv_dev->dev_kobj.state_in_sysfs) {
775 ret = rnbd_srv_create_dev_sysfs(srv_dev, rnbd_dev->bdev,
778 mutex_unlock(&srv_dev->lock);
779 rnbd_srv_err(srv_sess_dev,
780 "Opening device failed, failed to create device sysfs files, err: %d\n",
782 goto free_srv_sess_dev;
786 ret = rnbd_srv_create_dev_session_sysfs(srv_sess_dev);
788 mutex_unlock(&srv_dev->lock);
789 rnbd_srv_err(srv_sess_dev,
790 "Opening device failed, failed to create dev client sysfs files, err: %d\n",
792 goto free_srv_sess_dev;
795 list_add(&srv_sess_dev->dev_list, &srv_dev->sess_dev_list);
796 mutex_unlock(&srv_dev->lock);
798 list_add(&srv_sess_dev->sess_list, &srv_sess->sess_dev_list);
800 rnbd_srv_info(srv_sess_dev, "Opened device '%s'\n", srv_dev->id);
805 rnbd_srv_fill_msg_open_rsp(rsp, srv_sess_dev);
806 mutex_unlock(&srv_sess->lock);
810 xa_erase(&srv_sess->index_idr, srv_sess_dev->device_id);
814 if (open_msg->access_mode != RNBD_ACCESS_RO) {
815 mutex_lock(&srv_dev->lock);
816 srv_dev->open_write_cnt--;
817 mutex_unlock(&srv_dev->lock);
819 rnbd_put_srv_dev(srv_dev);
821 rnbd_dev_close(rnbd_dev);
825 mutex_unlock(&srv_sess->lock);
829 static struct rtrs_srv_ctx *rtrs_ctx;
831 static struct rtrs_srv_ops rtrs_ops;
832 static int __init rnbd_srv_init_module(void)
836 BUILD_BUG_ON(sizeof(struct rnbd_msg_hdr) != 4);
837 BUILD_BUG_ON(sizeof(struct rnbd_msg_sess_info) != 36);
838 BUILD_BUG_ON(sizeof(struct rnbd_msg_sess_info_rsp) != 36);
839 BUILD_BUG_ON(sizeof(struct rnbd_msg_open) != 264);
840 BUILD_BUG_ON(sizeof(struct rnbd_msg_close) != 8);
841 BUILD_BUG_ON(sizeof(struct rnbd_msg_open_rsp) != 56);
842 rtrs_ops = (struct rtrs_srv_ops) {
843 .rdma_ev = rnbd_srv_rdma_ev,
844 .link_ev = rnbd_srv_link_ev,
846 rtrs_ctx = rtrs_srv_open(&rtrs_ops, port_nr);
847 if (IS_ERR(rtrs_ctx)) {
848 err = PTR_ERR(rtrs_ctx);
849 pr_err("rtrs_srv_open(), err: %d\n", err);
853 err = rnbd_srv_create_sysfs_files();
855 pr_err("rnbd_srv_create_sysfs_files(), err: %d\n", err);
856 rtrs_srv_close(rtrs_ctx);
863 static void __exit rnbd_srv_cleanup_module(void)
865 rtrs_srv_close(rtrs_ctx);
866 WARN_ON(!list_empty(&sess_list));
867 rnbd_srv_destroy_sysfs_files();
870 module_init(rnbd_srv_init_module);
871 module_exit(rnbd_srv_cleanup_module);