Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Jack Wang | 3493 | 90.68% | 5 | 16.13% |
Christoph Hellwig | 130 | 3.37% | 11 | 35.48% |
Lutz Pogrell | 61 | 1.58% | 1 | 3.23% |
Xiao Jiang | 53 | 1.38% | 2 | 6.45% |
Santosh kumar pradhan | 35 | 0.91% | 1 | 3.23% |
Md Haris Iqbal | 34 | 0.88% | 2 | 6.45% |
Gioh Kim | 29 | 0.75% | 2 | 6.45% |
Vaishali Thakkar | 9 | 0.23% | 2 | 6.45% |
Guoqing Jiang | 4 | 0.10% | 3 | 9.68% |
Nathan Chancellor | 2 | 0.05% | 1 | 3.23% |
Dima Stepanov | 2 | 0.05% | 1 | 3.23% |
Total | 3852 | 31 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * RDMA Network Block Driver * * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. */ #undef pr_fmt #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt #include <linux/module.h> #include <linux/blkdev.h> #include "rnbd-srv.h" #include "rnbd-srv-trace.h" MODULE_DESCRIPTION("RDMA Network Block Device Server"); MODULE_LICENSE("GPL"); static u16 port_nr = RTRS_PORT; module_param_named(port_nr, port_nr, ushort, 0444); MODULE_PARM_DESC(port_nr, "The port number the server is listening on (default: " __stringify(RTRS_PORT)")"); #define DEFAULT_DEV_SEARCH_PATH "/" static char dev_search_path[PATH_MAX] = DEFAULT_DEV_SEARCH_PATH; static int dev_search_path_set(const char *val, const struct kernel_param *kp) { const char *p = strrchr(val, '\n') ? : val + strlen(val); if (strlen(val) >= sizeof(dev_search_path)) return -EINVAL; snprintf(dev_search_path, sizeof(dev_search_path), "%.*s", (int)(p - val), val); pr_info("dev_search_path changed to '%s'\n", dev_search_path); return 0; } static struct kparam_string dev_search_path_kparam_str = { .maxlen = sizeof(dev_search_path), .string = dev_search_path }; static const struct kernel_param_ops dev_search_path_ops = { .set = dev_search_path_set, .get = param_get_string, }; module_param_cb(dev_search_path, &dev_search_path_ops, &dev_search_path_kparam_str, 0444); MODULE_PARM_DESC(dev_search_path, "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: " DEFAULT_DEV_SEARCH_PATH ")"); static DEFINE_MUTEX(sess_lock); static DEFINE_SPINLOCK(dev_lock); static LIST_HEAD(sess_list); static LIST_HEAD(dev_list); struct rnbd_io_private { struct rtrs_srv_op *id; struct rnbd_srv_sess_dev *sess_dev; }; static void rnbd_sess_dev_release(struct kref *kref) { struct rnbd_srv_sess_dev *sess_dev; sess_dev = container_of(kref, struct rnbd_srv_sess_dev, kref); complete(sess_dev->destroy_comp); } static inline void rnbd_put_sess_dev(struct rnbd_srv_sess_dev *sess_dev) { kref_put(&sess_dev->kref, rnbd_sess_dev_release); } static struct rnbd_srv_sess_dev * rnbd_get_sess_dev(int dev_id, struct rnbd_srv_session *srv_sess) { struct rnbd_srv_sess_dev *sess_dev; int ret = 0; rcu_read_lock(); sess_dev = xa_load(&srv_sess->index_idr, dev_id); if (sess_dev) ret = kref_get_unless_zero(&sess_dev->kref); rcu_read_unlock(); if (!sess_dev || !ret) return ERR_PTR(-ENXIO); return sess_dev; } static void rnbd_dev_bi_end_io(struct bio *bio) { struct rnbd_io_private *rnbd_priv = bio->bi_private; struct rnbd_srv_sess_dev *sess_dev = rnbd_priv->sess_dev; rnbd_put_sess_dev(sess_dev); rtrs_srv_resp_rdma(rnbd_priv->id, blk_status_to_errno(bio->bi_status)); kfree(rnbd_priv); bio_put(bio); } static int process_rdma(struct rnbd_srv_session *srv_sess, struct rtrs_srv_op *id, void *data, u32 datalen, const void *usr, size_t usrlen) { const struct rnbd_msg_io *msg = usr; struct rnbd_io_private *priv; struct rnbd_srv_sess_dev *sess_dev; u32 dev_id; int err; struct bio *bio; short prio; trace_process_rdma(srv_sess, msg, id, datalen, usrlen); priv = kmalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; dev_id = le32_to_cpu(msg->device_id); sess_dev = rnbd_get_sess_dev(dev_id, srv_sess); if (IS_ERR(sess_dev)) { pr_err_ratelimited("Got I/O request on session %s for unknown device id %d\n", srv_sess->sessname, dev_id); err = -ENOTCONN; goto err; } priv->sess_dev = sess_dev; priv->id = id; bio = bio_alloc(sess_dev->bdev, 1, rnbd_to_bio_flags(le32_to_cpu(msg->rw)), GFP_KERNEL); if (bio_add_page(bio, virt_to_page(data), datalen, offset_in_page(data)) != datalen) { rnbd_srv_err(sess_dev, "Failed to map data to bio\n"); err = -EINVAL; goto bio_put; } bio->bi_end_io = rnbd_dev_bi_end_io; bio->bi_private = priv; bio->bi_iter.bi_sector = le64_to_cpu(msg->sector); bio->bi_iter.bi_size = le32_to_cpu(msg->bi_size); prio = srv_sess->ver < RNBD_PROTO_VER_MAJOR || usrlen < sizeof(*msg) ? 0 : le16_to_cpu(msg->prio); bio_set_prio(bio, prio); submit_bio(bio); return 0; bio_put: bio_put(bio); rnbd_put_sess_dev(sess_dev); err: kfree(priv); return err; } static void destroy_device(struct kref *kref) { struct rnbd_srv_dev *dev = container_of(kref, struct rnbd_srv_dev, kref); WARN_ONCE(!list_empty(&dev->sess_dev_list), "Device %s is being destroyed but still in use!\n", dev->id); spin_lock(&dev_lock); list_del(&dev->list); spin_unlock(&dev_lock); mutex_destroy(&dev->lock); if (dev->dev_kobj.state_in_sysfs) /* * Destroy kobj only if it was really created. */ rnbd_srv_destroy_dev_sysfs(dev); else kfree(dev); } static void rnbd_put_srv_dev(struct rnbd_srv_dev *dev) { kref_put(&dev->kref, destroy_device); } void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id) { DECLARE_COMPLETION_ONSTACK(dc); if (keep_id) /* free the resources for the id but don't */ /* allow to re-use the id itself because it */ /* is still used by the client */ xa_cmpxchg(&sess_dev->sess->index_idr, sess_dev->device_id, sess_dev, NULL, 0); else xa_erase(&sess_dev->sess->index_idr, sess_dev->device_id); synchronize_rcu(); sess_dev->destroy_comp = &dc; rnbd_put_sess_dev(sess_dev); wait_for_completion(&dc); /* wait for inflights to drop to zero */ blkdev_put(sess_dev->bdev, sess_dev->open_flags); mutex_lock(&sess_dev->dev->lock); list_del(&sess_dev->dev_list); if (sess_dev->open_flags & FMODE_WRITE) sess_dev->dev->open_write_cnt--; mutex_unlock(&sess_dev->dev->lock); rnbd_put_srv_dev(sess_dev->dev); rnbd_srv_info(sess_dev, "Device closed\n"); kfree(sess_dev); } static void destroy_sess(struct rnbd_srv_session *srv_sess) { struct rnbd_srv_sess_dev *sess_dev; unsigned long index; if (xa_empty(&srv_sess->index_idr)) goto out; trace_destroy_sess(srv_sess); mutex_lock(&srv_sess->lock); xa_for_each(&srv_sess->index_idr, index, sess_dev) rnbd_srv_destroy_dev_session_sysfs(sess_dev); mutex_unlock(&srv_sess->lock); out: xa_destroy(&srv_sess->index_idr); pr_info("RTRS Session %s disconnected\n", srv_sess->sessname); mutex_lock(&sess_lock); list_del(&srv_sess->list); mutex_unlock(&sess_lock); mutex_destroy(&srv_sess->lock); kfree(srv_sess); } static int create_sess(struct rtrs_srv_sess *rtrs) { struct rnbd_srv_session *srv_sess; char pathname[NAME_MAX]; int err; err = rtrs_srv_get_path_name(rtrs, pathname, sizeof(pathname)); if (err) { pr_err("rtrs_srv_get_path_name(%s): %d\n", pathname, err); return err; } srv_sess = kzalloc(sizeof(*srv_sess), GFP_KERNEL); if (!srv_sess) return -ENOMEM; srv_sess->queue_depth = rtrs_srv_get_queue_depth(rtrs); xa_init_flags(&srv_sess->index_idr, XA_FLAGS_ALLOC); mutex_init(&srv_sess->lock); mutex_lock(&sess_lock); list_add(&srv_sess->list, &sess_list); mutex_unlock(&sess_lock); srv_sess->rtrs = rtrs; strscpy(srv_sess->sessname, pathname, sizeof(srv_sess->sessname)); rtrs_srv_set_sess_priv(rtrs, srv_sess); trace_create_sess(srv_sess); return 0; } static int rnbd_srv_link_ev(struct rtrs_srv_sess *rtrs, enum rtrs_srv_link_ev ev, void *priv) { struct rnbd_srv_session *srv_sess = priv; switch (ev) { case RTRS_SRV_LINK_EV_CONNECTED: return create_sess(rtrs); case RTRS_SRV_LINK_EV_DISCONNECTED: if (WARN_ON_ONCE(!srv_sess)) return -EINVAL; destroy_sess(srv_sess); return 0; default: pr_warn("Received unknown RTRS session event %d from session %s\n", ev, srv_sess->sessname); return -EINVAL; } } void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev, struct kobj_attribute *attr) { struct rnbd_srv_session *sess = sess_dev->sess; /* It is already started to close by client's close message. */ if (!mutex_trylock(&sess->lock)) return; sess_dev->keep_id = true; /* first remove sysfs itself to avoid deadlock */ sysfs_remove_file_self(&sess_dev->kobj, &attr->attr); rnbd_srv_destroy_dev_session_sysfs(sess_dev); mutex_unlock(&sess->lock); } static void process_msg_close(struct rnbd_srv_session *srv_sess, void *data, size_t datalen, const void *usr, size_t usrlen) { const struct rnbd_msg_close *close_msg = usr; struct rnbd_srv_sess_dev *sess_dev; trace_process_msg_close(srv_sess, close_msg); sess_dev = rnbd_get_sess_dev(le32_to_cpu(close_msg->device_id), srv_sess); if (IS_ERR(sess_dev)) return; rnbd_put_sess_dev(sess_dev); mutex_lock(&srv_sess->lock); rnbd_srv_destroy_dev_session_sysfs(sess_dev); mutex_unlock(&srv_sess->lock); } static int process_msg_open(struct rnbd_srv_session *srv_sess, const void *msg, size_t len, void *data, size_t datalen); static int process_msg_sess_info(struct rnbd_srv_session *srv_sess, const void *msg, size_t len, void *data, size_t datalen); static int rnbd_srv_rdma_ev(void *priv, struct rtrs_srv_op *id, void *data, size_t datalen, const void *usr, size_t usrlen) { struct rnbd_srv_session *srv_sess = priv; const struct rnbd_msg_hdr *hdr = usr; int ret = 0; u16 type; if (WARN_ON_ONCE(!srv_sess)) return -ENODEV; type = le16_to_cpu(hdr->type); switch (type) { case RNBD_MSG_IO: return process_rdma(srv_sess, id, data, datalen, usr, usrlen); case RNBD_MSG_CLOSE: process_msg_close(srv_sess, data, datalen, usr, usrlen); break; case RNBD_MSG_OPEN: ret = process_msg_open(srv_sess, usr, usrlen, data, datalen); break; case RNBD_MSG_SESS_INFO: ret = process_msg_sess_info(srv_sess, usr, usrlen, data, datalen); break; default: pr_warn("Received unexpected message type %d from session %s\n", type, srv_sess->sessname); return -EINVAL; } /* * Since ret is passed to rtrs to handle the failure case, we * just return 0 at the end otherwise callers in rtrs would call * send_io_resp_imm again to print redundant err message. */ rtrs_srv_resp_rdma(id, ret); return 0; } static struct rnbd_srv_sess_dev *rnbd_sess_dev_alloc(struct rnbd_srv_session *srv_sess) { struct rnbd_srv_sess_dev *sess_dev; int error; sess_dev = kzalloc(sizeof(*sess_dev), GFP_KERNEL); if (!sess_dev) return ERR_PTR(-ENOMEM); error = xa_alloc(&srv_sess->index_idr, &sess_dev->device_id, sess_dev, xa_limit_32b, GFP_NOWAIT); if (error < 0) { pr_warn("Allocating idr failed, err: %d\n", error); kfree(sess_dev); return ERR_PTR(error); } return sess_dev; } static struct rnbd_srv_dev *rnbd_srv_init_srv_dev(struct block_device *bdev) { struct rnbd_srv_dev *dev; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return ERR_PTR(-ENOMEM); snprintf(dev->id, sizeof(dev->id), "%pg", bdev); kref_init(&dev->kref); INIT_LIST_HEAD(&dev->sess_dev_list); mutex_init(&dev->lock); return dev; } static struct rnbd_srv_dev * rnbd_srv_find_or_add_srv_dev(struct rnbd_srv_dev *new_dev) { struct rnbd_srv_dev *dev; spin_lock(&dev_lock); list_for_each_entry(dev, &dev_list, list) { if (!strncmp(dev->id, new_dev->id, sizeof(dev->id))) { if (!kref_get_unless_zero(&dev->kref)) /* * We lost the race, device is almost dead. * Continue traversing to find a valid one. */ continue; spin_unlock(&dev_lock); return dev; } } list_add(&new_dev->list, &dev_list); spin_unlock(&dev_lock); return new_dev; } static int rnbd_srv_check_update_open_perm(struct rnbd_srv_dev *srv_dev, struct rnbd_srv_session *srv_sess, enum rnbd_access_mode access_mode) { int ret = -EPERM; mutex_lock(&srv_dev->lock); switch (access_mode) { case RNBD_ACCESS_RO: ret = 0; break; case RNBD_ACCESS_RW: if (srv_dev->open_write_cnt == 0) { srv_dev->open_write_cnt++; ret = 0; } else { 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", srv_dev->id, srv_sess->sessname, srv_dev->open_write_cnt, rnbd_access_mode_str(access_mode)); } break; case RNBD_ACCESS_MIGRATION: if (srv_dev->open_write_cnt < 2) { srv_dev->open_write_cnt++; ret = 0; } else { 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", srv_dev->id, srv_sess->sessname, srv_dev->open_write_cnt, rnbd_access_mode_str(access_mode)); } break; default: pr_err("Received mapping request for device '%s' on session %s with invalid access mode: %d\n", srv_dev->id, srv_sess->sessname, access_mode); ret = -EINVAL; } mutex_unlock(&srv_dev->lock); return ret; } static struct rnbd_srv_dev * rnbd_srv_get_or_create_srv_dev(struct block_device *bdev, struct rnbd_srv_session *srv_sess, enum rnbd_access_mode access_mode) { int ret; struct rnbd_srv_dev *new_dev, *dev; new_dev = rnbd_srv_init_srv_dev(bdev); if (IS_ERR(new_dev)) return new_dev; dev = rnbd_srv_find_or_add_srv_dev(new_dev); if (dev != new_dev) kfree(new_dev); ret = rnbd_srv_check_update_open_perm(dev, srv_sess, access_mode); if (ret) { rnbd_put_srv_dev(dev); return ERR_PTR(ret); } return dev; } static void rnbd_srv_fill_msg_open_rsp(struct rnbd_msg_open_rsp *rsp, struct rnbd_srv_sess_dev *sess_dev) { struct block_device *bdev = sess_dev->bdev; rsp->hdr.type = cpu_to_le16(RNBD_MSG_OPEN_RSP); rsp->device_id = cpu_to_le32(sess_dev->device_id); rsp->nsectors = cpu_to_le64(bdev_nr_sectors(bdev)); rsp->logical_block_size = cpu_to_le16(bdev_logical_block_size(bdev)); rsp->physical_block_size = cpu_to_le16(bdev_physical_block_size(bdev)); rsp->max_segments = cpu_to_le16(bdev_max_segments(bdev)); rsp->max_hw_sectors = cpu_to_le32(queue_max_hw_sectors(bdev_get_queue(bdev))); rsp->max_write_same_sectors = 0; rsp->max_discard_sectors = cpu_to_le32(bdev_max_discard_sectors(bdev)); rsp->discard_granularity = cpu_to_le32(bdev_discard_granularity(bdev)); rsp->discard_alignment = cpu_to_le32(bdev_discard_alignment(bdev)); rsp->secure_discard = cpu_to_le16(bdev_max_secure_erase_sectors(bdev)); rsp->cache_policy = 0; if (bdev_write_cache(bdev)) rsp->cache_policy |= RNBD_WRITEBACK; if (bdev_fua(bdev)) rsp->cache_policy |= RNBD_FUA; } static struct rnbd_srv_sess_dev * rnbd_srv_create_set_sess_dev(struct rnbd_srv_session *srv_sess, const struct rnbd_msg_open *open_msg, struct block_device *bdev, fmode_t open_flags, struct rnbd_srv_dev *srv_dev) { struct rnbd_srv_sess_dev *sdev = rnbd_sess_dev_alloc(srv_sess); if (IS_ERR(sdev)) return sdev; kref_init(&sdev->kref); strscpy(sdev->pathname, open_msg->dev_name, sizeof(sdev->pathname)); sdev->bdev = bdev; sdev->sess = srv_sess; sdev->dev = srv_dev; sdev->open_flags = open_flags; sdev->access_mode = open_msg->access_mode; return sdev; } static char *rnbd_srv_get_full_path(struct rnbd_srv_session *srv_sess, const char *dev_name) { char *full_path; char *a, *b; full_path = kmalloc(PATH_MAX, GFP_KERNEL); if (!full_path) return ERR_PTR(-ENOMEM); /* * Replace %SESSNAME% with a real session name in order to * create device namespace. */ a = strnstr(dev_search_path, "%SESSNAME%", sizeof(dev_search_path)); if (a) { int len = a - dev_search_path; len = snprintf(full_path, PATH_MAX, "%.*s/%s/%s", len, dev_search_path, srv_sess->sessname, dev_name); if (len >= PATH_MAX) { pr_err("Too long path: %s, %s, %s\n", dev_search_path, srv_sess->sessname, dev_name); kfree(full_path); return ERR_PTR(-EINVAL); } } else { snprintf(full_path, PATH_MAX, "%s/%s", dev_search_path, dev_name); } /* eliminitate duplicated slashes */ a = strchr(full_path, '/'); b = a; while (*b != '\0') { if (*b == '/' && *a == '/') { b++; } else { a++; *a = *b; b++; } } a++; *a = '\0'; return full_path; } static int process_msg_sess_info(struct rnbd_srv_session *srv_sess, const void *msg, size_t len, void *data, size_t datalen) { const struct rnbd_msg_sess_info *sess_info_msg = msg; struct rnbd_msg_sess_info_rsp *rsp = data; srv_sess->ver = min_t(u8, sess_info_msg->ver, RNBD_PROTO_VER_MAJOR); trace_process_msg_sess_info(srv_sess, sess_info_msg); rsp->hdr.type = cpu_to_le16(RNBD_MSG_SESS_INFO_RSP); rsp->ver = srv_sess->ver; return 0; } /** * find_srv_sess_dev() - a dev is already opened by this name * @srv_sess: the session to search. * @dev_name: string containing the name of the device. * * Return struct rnbd_srv_sess_dev if srv_sess already opened the dev_name * NULL if the session didn't open the device yet. */ static struct rnbd_srv_sess_dev * find_srv_sess_dev(struct rnbd_srv_session *srv_sess, const char *dev_name) { struct rnbd_srv_sess_dev *sess_dev; unsigned long index; if (xa_empty(&srv_sess->index_idr)) return NULL; xa_for_each(&srv_sess->index_idr, index, sess_dev) if (!strcmp(sess_dev->pathname, dev_name)) return sess_dev; return NULL; } static int process_msg_open(struct rnbd_srv_session *srv_sess, const void *msg, size_t len, void *data, size_t datalen) { int ret; struct rnbd_srv_dev *srv_dev; struct rnbd_srv_sess_dev *srv_sess_dev; const struct rnbd_msg_open *open_msg = msg; struct block_device *bdev; fmode_t open_flags; char *full_path; struct rnbd_msg_open_rsp *rsp = data; trace_process_msg_open(srv_sess, open_msg); open_flags = FMODE_READ; if (open_msg->access_mode != RNBD_ACCESS_RO) open_flags |= FMODE_WRITE; mutex_lock(&srv_sess->lock); srv_sess_dev = find_srv_sess_dev(srv_sess, open_msg->dev_name); if (srv_sess_dev) goto fill_response; if ((strlen(dev_search_path) + strlen(open_msg->dev_name)) >= PATH_MAX) { pr_err("Opening device for session %s failed, device path too long. '%s/%s' is longer than PATH_MAX (%d)\n", srv_sess->sessname, dev_search_path, open_msg->dev_name, PATH_MAX); ret = -EINVAL; goto reject; } if (strstr(open_msg->dev_name, "..")) { pr_err("Opening device for session %s failed, device path %s contains relative path ..\n", srv_sess->sessname, open_msg->dev_name); ret = -EINVAL; goto reject; } full_path = rnbd_srv_get_full_path(srv_sess, open_msg->dev_name); if (IS_ERR(full_path)) { ret = PTR_ERR(full_path); pr_err("Opening device '%s' for client %s failed, failed to get device full path, err: %d\n", open_msg->dev_name, srv_sess->sessname, ret); goto reject; } bdev = blkdev_get_by_path(full_path, open_flags, THIS_MODULE); if (IS_ERR(bdev)) { ret = PTR_ERR(bdev); pr_err("Opening device '%s' on session %s failed, failed to open the block device, err: %d\n", full_path, srv_sess->sessname, ret); goto free_path; } srv_dev = rnbd_srv_get_or_create_srv_dev(bdev, srv_sess, open_msg->access_mode); if (IS_ERR(srv_dev)) { pr_err("Opening device '%s' on session %s failed, creating srv_dev failed, err: %ld\n", full_path, srv_sess->sessname, PTR_ERR(srv_dev)); ret = PTR_ERR(srv_dev); goto blkdev_put; } srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg, bdev, open_flags, srv_dev); if (IS_ERR(srv_sess_dev)) { pr_err("Opening device '%s' on session %s failed, creating sess_dev failed, err: %ld\n", full_path, srv_sess->sessname, PTR_ERR(srv_sess_dev)); ret = PTR_ERR(srv_sess_dev); goto srv_dev_put; } /* Create the srv_dev sysfs files if they haven't been created yet. The * reason to delay the creation is not to create the sysfs files before * we are sure the device can be opened. */ mutex_lock(&srv_dev->lock); if (!srv_dev->dev_kobj.state_in_sysfs) { ret = rnbd_srv_create_dev_sysfs(srv_dev, bdev); if (ret) { mutex_unlock(&srv_dev->lock); rnbd_srv_err(srv_sess_dev, "Opening device failed, failed to create device sysfs files, err: %d\n", ret); goto free_srv_sess_dev; } } ret = rnbd_srv_create_dev_session_sysfs(srv_sess_dev); if (ret) { mutex_unlock(&srv_dev->lock); rnbd_srv_err(srv_sess_dev, "Opening device failed, failed to create dev client sysfs files, err: %d\n", ret); goto free_srv_sess_dev; } list_add(&srv_sess_dev->dev_list, &srv_dev->sess_dev_list); mutex_unlock(&srv_dev->lock); rnbd_srv_info(srv_sess_dev, "Opened device '%s'\n", srv_dev->id); kfree(full_path); fill_response: rnbd_srv_fill_msg_open_rsp(rsp, srv_sess_dev); mutex_unlock(&srv_sess->lock); return 0; free_srv_sess_dev: xa_erase(&srv_sess->index_idr, srv_sess_dev->device_id); synchronize_rcu(); kfree(srv_sess_dev); srv_dev_put: if (open_msg->access_mode != RNBD_ACCESS_RO) { mutex_lock(&srv_dev->lock); srv_dev->open_write_cnt--; mutex_unlock(&srv_dev->lock); } rnbd_put_srv_dev(srv_dev); blkdev_put: blkdev_put(bdev, open_flags); free_path: kfree(full_path); reject: mutex_unlock(&srv_sess->lock); return ret; } static struct rtrs_srv_ctx *rtrs_ctx; static struct rtrs_srv_ops rtrs_ops; static int __init rnbd_srv_init_module(void) { int err; BUILD_BUG_ON(sizeof(struct rnbd_msg_hdr) != 4); BUILD_BUG_ON(sizeof(struct rnbd_msg_sess_info) != 36); BUILD_BUG_ON(sizeof(struct rnbd_msg_sess_info_rsp) != 36); BUILD_BUG_ON(sizeof(struct rnbd_msg_open) != 264); BUILD_BUG_ON(sizeof(struct rnbd_msg_close) != 8); BUILD_BUG_ON(sizeof(struct rnbd_msg_open_rsp) != 56); rtrs_ops = (struct rtrs_srv_ops) { .rdma_ev = rnbd_srv_rdma_ev, .link_ev = rnbd_srv_link_ev, }; rtrs_ctx = rtrs_srv_open(&rtrs_ops, port_nr); if (IS_ERR(rtrs_ctx)) { err = PTR_ERR(rtrs_ctx); pr_err("rtrs_srv_open(), err: %d\n", err); return err; } err = rnbd_srv_create_sysfs_files(); if (err) { pr_err("rnbd_srv_create_sysfs_files(), err: %d\n", err); rtrs_srv_close(rtrs_ctx); return err; } return 0; } static void __exit rnbd_srv_cleanup_module(void) { rtrs_srv_close(rtrs_ctx); WARN_ON(!list_empty(&sess_list)); rnbd_srv_destroy_sysfs_files(); } module_init(rnbd_srv_init_module); module_exit(rnbd_srv_cleanup_module);
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1