12de6c8deSJack Wang // SPDX-License-Identifier: GPL-2.0-or-later 22de6c8deSJack Wang /* 32de6c8deSJack Wang * RDMA Network Block Driver 42de6c8deSJack Wang * 52de6c8deSJack Wang * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. 62de6c8deSJack Wang * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. 72de6c8deSJack Wang * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. 82de6c8deSJack Wang */ 92de6c8deSJack Wang #undef pr_fmt 102de6c8deSJack Wang #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt 112de6c8deSJack Wang 122de6c8deSJack Wang #include <linux/module.h> 132de6c8deSJack Wang #include <linux/blkdev.h> 142de6c8deSJack Wang 152de6c8deSJack Wang #include "rnbd-srv.h" 162de6c8deSJack Wang #include "rnbd-srv-dev.h" 172de6c8deSJack Wang 182de6c8deSJack Wang MODULE_DESCRIPTION("RDMA Network Block Device Server"); 192de6c8deSJack Wang MODULE_LICENSE("GPL"); 202de6c8deSJack Wang 212de6c8deSJack Wang static u16 port_nr = RTRS_PORT; 222de6c8deSJack Wang 232de6c8deSJack Wang module_param_named(port_nr, port_nr, ushort, 0444); 242de6c8deSJack Wang MODULE_PARM_DESC(port_nr, 252de6c8deSJack Wang "The port number the server is listening on (default: " 262de6c8deSJack Wang __stringify(RTRS_PORT)")"); 272de6c8deSJack Wang 282de6c8deSJack Wang #define DEFAULT_DEV_SEARCH_PATH "/" 292de6c8deSJack Wang 302de6c8deSJack Wang static char dev_search_path[PATH_MAX] = DEFAULT_DEV_SEARCH_PATH; 312de6c8deSJack Wang 322de6c8deSJack Wang static int dev_search_path_set(const char *val, const struct kernel_param *kp) 332de6c8deSJack Wang { 342de6c8deSJack Wang const char *p = strrchr(val, '\n') ? : val + strlen(val); 352de6c8deSJack Wang 362de6c8deSJack Wang if (strlen(val) >= sizeof(dev_search_path)) 372de6c8deSJack Wang return -EINVAL; 382de6c8deSJack Wang 392de6c8deSJack Wang snprintf(dev_search_path, sizeof(dev_search_path), "%.*s", 402de6c8deSJack Wang (int)(p - val), val); 412de6c8deSJack Wang 422de6c8deSJack Wang pr_info("dev_search_path changed to '%s'\n", dev_search_path); 432de6c8deSJack Wang 442de6c8deSJack Wang return 0; 452de6c8deSJack Wang } 462de6c8deSJack Wang 472de6c8deSJack Wang static struct kparam_string dev_search_path_kparam_str = { 482de6c8deSJack Wang .maxlen = sizeof(dev_search_path), 492de6c8deSJack Wang .string = dev_search_path 502de6c8deSJack Wang }; 512de6c8deSJack Wang 522de6c8deSJack Wang static const struct kernel_param_ops dev_search_path_ops = { 532de6c8deSJack Wang .set = dev_search_path_set, 542de6c8deSJack Wang .get = param_get_string, 552de6c8deSJack Wang }; 562de6c8deSJack Wang 572de6c8deSJack Wang module_param_cb(dev_search_path, &dev_search_path_ops, 582de6c8deSJack Wang &dev_search_path_kparam_str, 0444); 592de6c8deSJack Wang MODULE_PARM_DESC(dev_search_path, 602de6c8deSJack Wang "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: " 612de6c8deSJack Wang DEFAULT_DEV_SEARCH_PATH ")"); 622de6c8deSJack Wang 632de6c8deSJack Wang static DEFINE_MUTEX(sess_lock); 642de6c8deSJack Wang static DEFINE_SPINLOCK(dev_lock); 652de6c8deSJack Wang 662de6c8deSJack Wang static LIST_HEAD(sess_list); 672de6c8deSJack Wang static LIST_HEAD(dev_list); 682de6c8deSJack Wang 692de6c8deSJack Wang struct rnbd_io_private { 702de6c8deSJack Wang struct rtrs_srv_op *id; 712de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev; 722de6c8deSJack Wang }; 732de6c8deSJack Wang 742de6c8deSJack Wang static void rnbd_sess_dev_release(struct kref *kref) 752de6c8deSJack Wang { 762de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev; 772de6c8deSJack Wang 782de6c8deSJack Wang sess_dev = container_of(kref, struct rnbd_srv_sess_dev, kref); 792de6c8deSJack Wang complete(sess_dev->destroy_comp); 802de6c8deSJack Wang } 812de6c8deSJack Wang 822de6c8deSJack Wang static inline void rnbd_put_sess_dev(struct rnbd_srv_sess_dev *sess_dev) 832de6c8deSJack Wang { 842de6c8deSJack Wang kref_put(&sess_dev->kref, rnbd_sess_dev_release); 852de6c8deSJack Wang } 862de6c8deSJack Wang 872de6c8deSJack Wang void rnbd_endio(void *priv, int error) 882de6c8deSJack Wang { 892de6c8deSJack Wang struct rnbd_io_private *rnbd_priv = priv; 902de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev = rnbd_priv->sess_dev; 912de6c8deSJack Wang 922de6c8deSJack Wang rnbd_put_sess_dev(sess_dev); 932de6c8deSJack Wang 942de6c8deSJack Wang rtrs_srv_resp_rdma(rnbd_priv->id, error); 952de6c8deSJack Wang 962de6c8deSJack Wang kfree(priv); 972de6c8deSJack Wang } 982de6c8deSJack Wang 992de6c8deSJack Wang static struct rnbd_srv_sess_dev * 1002de6c8deSJack Wang rnbd_get_sess_dev(int dev_id, struct rnbd_srv_session *srv_sess) 1012de6c8deSJack Wang { 1022de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev; 1032de6c8deSJack Wang int ret = 0; 1042de6c8deSJack Wang 1052de6c8deSJack Wang rcu_read_lock(); 1062de6c8deSJack Wang sess_dev = xa_load(&srv_sess->index_idr, dev_id); 1071e31016bSGioh Kim if (sess_dev) 1082de6c8deSJack Wang ret = kref_get_unless_zero(&sess_dev->kref); 1092de6c8deSJack Wang rcu_read_unlock(); 1102de6c8deSJack Wang 1112de6c8deSJack Wang if (!sess_dev || !ret) 1122de6c8deSJack Wang return ERR_PTR(-ENXIO); 1132de6c8deSJack Wang 1142de6c8deSJack Wang return sess_dev; 1152de6c8deSJack Wang } 1162de6c8deSJack Wang 117*1fe0640fSChristoph Hellwig static void rnbd_dev_bi_end_io(struct bio *bio) 118*1fe0640fSChristoph Hellwig { 119*1fe0640fSChristoph Hellwig struct rnbd_dev_blk_io *io = bio->bi_private; 120*1fe0640fSChristoph Hellwig 121*1fe0640fSChristoph Hellwig rnbd_endio(io->priv, blk_status_to_errno(bio->bi_status)); 122*1fe0640fSChristoph Hellwig bio_put(bio); 123*1fe0640fSChristoph Hellwig } 124*1fe0640fSChristoph Hellwig 125c81cba85SGioh Kim static int process_rdma(struct rnbd_srv_session *srv_sess, 1262de6c8deSJack Wang struct rtrs_srv_op *id, void *data, u32 datalen, 1272de6c8deSJack Wang const void *usr, size_t usrlen) 1282de6c8deSJack Wang { 1292de6c8deSJack Wang const struct rnbd_msg_io *msg = usr; 1302de6c8deSJack Wang struct rnbd_io_private *priv; 1312de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev; 1322de6c8deSJack Wang u32 dev_id; 1332de6c8deSJack Wang int err; 134735d77d4SGuoqing Jiang struct rnbd_dev_blk_io *io; 135735d77d4SGuoqing Jiang struct bio *bio; 136735d77d4SGuoqing Jiang short prio; 1372de6c8deSJack Wang 1382de6c8deSJack Wang priv = kmalloc(sizeof(*priv), GFP_KERNEL); 1392de6c8deSJack Wang if (!priv) 1402de6c8deSJack Wang return -ENOMEM; 1412de6c8deSJack Wang 1422de6c8deSJack Wang dev_id = le32_to_cpu(msg->device_id); 1432de6c8deSJack Wang 1442de6c8deSJack Wang sess_dev = rnbd_get_sess_dev(dev_id, srv_sess); 1452de6c8deSJack Wang if (IS_ERR(sess_dev)) { 1462de6c8deSJack Wang pr_err_ratelimited("Got I/O request on session %s for unknown device id %d\n", 1472de6c8deSJack Wang srv_sess->sessname, dev_id); 1482de6c8deSJack Wang err = -ENOTCONN; 1492de6c8deSJack Wang goto err; 1502de6c8deSJack Wang } 1512de6c8deSJack Wang 1522de6c8deSJack Wang priv->sess_dev = sess_dev; 1532de6c8deSJack Wang priv->id = id; 1542de6c8deSJack Wang 155*1fe0640fSChristoph Hellwig bio = bio_alloc_bioset(GFP_KERNEL, 1, sess_dev->rnbd_dev->ibd_bio_set); 156*1fe0640fSChristoph Hellwig if (bio_add_page(bio, virt_to_page(data), datalen, 157*1fe0640fSChristoph Hellwig offset_in_page(data)) != datalen) { 158*1fe0640fSChristoph Hellwig rnbd_srv_err(sess_dev, "Failed to map data to bio\n"); 159*1fe0640fSChristoph Hellwig err = -EINVAL; 160*1fe0640fSChristoph Hellwig goto bio_put; 1612de6c8deSJack Wang } 1622de6c8deSJack Wang 163735d77d4SGuoqing Jiang io = container_of(bio, struct rnbd_dev_blk_io, bio); 164735d77d4SGuoqing Jiang io->dev = sess_dev->rnbd_dev; 165735d77d4SGuoqing Jiang io->priv = priv; 166735d77d4SGuoqing Jiang 167735d77d4SGuoqing Jiang bio->bi_end_io = rnbd_dev_bi_end_io; 168735d77d4SGuoqing Jiang bio->bi_private = io; 169735d77d4SGuoqing Jiang bio->bi_opf = rnbd_to_bio_flags(le32_to_cpu(msg->rw)); 170735d77d4SGuoqing Jiang bio->bi_iter.bi_sector = le64_to_cpu(msg->sector); 171735d77d4SGuoqing Jiang bio->bi_iter.bi_size = le32_to_cpu(msg->bi_size); 172735d77d4SGuoqing Jiang prio = srv_sess->ver < RNBD_PROTO_VER_MAJOR || 173735d77d4SGuoqing Jiang usrlen < sizeof(*msg) ? 0 : le16_to_cpu(msg->prio); 174735d77d4SGuoqing Jiang bio_set_prio(bio, prio); 175735d77d4SGuoqing Jiang bio_set_dev(bio, sess_dev->rnbd_dev->bdev); 176735d77d4SGuoqing Jiang 177735d77d4SGuoqing Jiang submit_bio(bio); 178735d77d4SGuoqing Jiang 1792de6c8deSJack Wang return 0; 1802de6c8deSJack Wang 181*1fe0640fSChristoph Hellwig bio_put: 182*1fe0640fSChristoph Hellwig bio_put(bio); 1832de6c8deSJack Wang rnbd_put_sess_dev(sess_dev); 1842de6c8deSJack Wang err: 1852de6c8deSJack Wang kfree(priv); 1862de6c8deSJack Wang return err; 1872de6c8deSJack Wang } 1882de6c8deSJack Wang 189d16b5ac8SGuoqing Jiang static void destroy_device(struct kref *kref) 1902de6c8deSJack Wang { 191d16b5ac8SGuoqing Jiang struct rnbd_srv_dev *dev = container_of(kref, struct rnbd_srv_dev, kref); 192d16b5ac8SGuoqing Jiang 1932de6c8deSJack Wang WARN_ONCE(!list_empty(&dev->sess_dev_list), 1942de6c8deSJack Wang "Device %s is being destroyed but still in use!\n", 1952de6c8deSJack Wang dev->id); 1962de6c8deSJack Wang 1972de6c8deSJack Wang spin_lock(&dev_lock); 1982de6c8deSJack Wang list_del(&dev->list); 1992de6c8deSJack Wang spin_unlock(&dev_lock); 2002de6c8deSJack Wang 2012de6c8deSJack Wang mutex_destroy(&dev->lock); 2022de6c8deSJack Wang if (dev->dev_kobj.state_in_sysfs) 2032de6c8deSJack Wang /* 2042de6c8deSJack Wang * Destroy kobj only if it was really created. 2052de6c8deSJack Wang */ 2062de6c8deSJack Wang rnbd_srv_destroy_dev_sysfs(dev); 2072de6c8deSJack Wang else 2082de6c8deSJack Wang kfree(dev); 2092de6c8deSJack Wang } 2102de6c8deSJack Wang 2112de6c8deSJack Wang static void rnbd_put_srv_dev(struct rnbd_srv_dev *dev) 2122de6c8deSJack Wang { 213d16b5ac8SGuoqing Jiang kref_put(&dev->kref, destroy_device); 2142de6c8deSJack Wang } 2152de6c8deSJack Wang 21678699805SLutz Pogrell void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id) 2172de6c8deSJack Wang { 2182de6c8deSJack Wang DECLARE_COMPLETION_ONSTACK(dc); 2192de6c8deSJack Wang 22078699805SLutz Pogrell if (keep_id) 22178699805SLutz Pogrell /* free the resources for the id but don't */ 22278699805SLutz Pogrell /* allow to re-use the id itself because it */ 22378699805SLutz Pogrell /* is still used by the client */ 22478699805SLutz Pogrell xa_cmpxchg(&sess_dev->sess->index_idr, sess_dev->device_id, 22578699805SLutz Pogrell sess_dev, NULL, 0); 22678699805SLutz Pogrell else 2272de6c8deSJack Wang xa_erase(&sess_dev->sess->index_idr, sess_dev->device_id); 2282de6c8deSJack Wang synchronize_rcu(); 22978699805SLutz Pogrell 2302de6c8deSJack Wang sess_dev->destroy_comp = &dc; 2312de6c8deSJack Wang rnbd_put_sess_dev(sess_dev); 2322de6c8deSJack Wang wait_for_completion(&dc); /* wait for inflights to drop to zero */ 2332de6c8deSJack Wang 2342de6c8deSJack Wang rnbd_dev_close(sess_dev->rnbd_dev); 2352de6c8deSJack Wang list_del(&sess_dev->sess_list); 2362de6c8deSJack Wang mutex_lock(&sess_dev->dev->lock); 2372de6c8deSJack Wang list_del(&sess_dev->dev_list); 2382de6c8deSJack Wang if (sess_dev->open_flags & FMODE_WRITE) 2392de6c8deSJack Wang sess_dev->dev->open_write_cnt--; 2402de6c8deSJack Wang mutex_unlock(&sess_dev->dev->lock); 2412de6c8deSJack Wang 2422de6c8deSJack Wang rnbd_put_srv_dev(sess_dev->dev); 2432de6c8deSJack Wang 2442de6c8deSJack Wang rnbd_srv_info(sess_dev, "Device closed\n"); 2452de6c8deSJack Wang kfree(sess_dev); 2462de6c8deSJack Wang } 2472de6c8deSJack Wang 2482de6c8deSJack Wang static void destroy_sess(struct rnbd_srv_session *srv_sess) 2492de6c8deSJack Wang { 2502de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev, *tmp; 2512de6c8deSJack Wang 2522de6c8deSJack Wang if (list_empty(&srv_sess->sess_dev_list)) 2532de6c8deSJack Wang goto out; 2542de6c8deSJack Wang 2552de6c8deSJack Wang mutex_lock(&srv_sess->lock); 2562de6c8deSJack Wang list_for_each_entry_safe(sess_dev, tmp, &srv_sess->sess_dev_list, 2572de6c8deSJack Wang sess_list) 2582de6c8deSJack Wang rnbd_srv_destroy_dev_session_sysfs(sess_dev); 2592de6c8deSJack Wang mutex_unlock(&srv_sess->lock); 2602de6c8deSJack Wang 2612de6c8deSJack Wang out: 2622de6c8deSJack Wang xa_destroy(&srv_sess->index_idr); 2632de6c8deSJack Wang bioset_exit(&srv_sess->sess_bio_set); 2642de6c8deSJack Wang 2652de6c8deSJack Wang pr_info("RTRS Session %s disconnected\n", srv_sess->sessname); 2662de6c8deSJack Wang 2672de6c8deSJack Wang mutex_lock(&sess_lock); 2682de6c8deSJack Wang list_del(&srv_sess->list); 2692de6c8deSJack Wang mutex_unlock(&sess_lock); 2702de6c8deSJack Wang 2712de6c8deSJack Wang mutex_destroy(&srv_sess->lock); 2722de6c8deSJack Wang kfree(srv_sess); 2732de6c8deSJack Wang } 2742de6c8deSJack Wang 275f7ecac6aSVaishali Thakkar static int create_sess(struct rtrs_srv_sess *rtrs) 2762de6c8deSJack Wang { 2772de6c8deSJack Wang struct rnbd_srv_session *srv_sess; 278ae4c8164SVaishali Thakkar char pathname[NAME_MAX]; 2792de6c8deSJack Wang int err; 2802de6c8deSJack Wang 281ae4c8164SVaishali Thakkar err = rtrs_srv_get_path_name(rtrs, pathname, sizeof(pathname)); 2822de6c8deSJack Wang if (err) { 283ae4c8164SVaishali Thakkar pr_err("rtrs_srv_get_path_name(%s): %d\n", pathname, err); 2842de6c8deSJack Wang 2852de6c8deSJack Wang return err; 2862de6c8deSJack Wang } 2872de6c8deSJack Wang srv_sess = kzalloc(sizeof(*srv_sess), GFP_KERNEL); 2882de6c8deSJack Wang if (!srv_sess) 2892de6c8deSJack Wang return -ENOMEM; 2902de6c8deSJack Wang 2912de6c8deSJack Wang srv_sess->queue_depth = rtrs_srv_get_queue_depth(rtrs); 2922de6c8deSJack Wang err = bioset_init(&srv_sess->sess_bio_set, srv_sess->queue_depth, 2932de6c8deSJack Wang offsetof(struct rnbd_dev_blk_io, bio), 2942de6c8deSJack Wang BIOSET_NEED_BVECS); 2952de6c8deSJack Wang if (err) { 296ae4c8164SVaishali Thakkar pr_err("Allocating srv_session for path %s failed\n", 297ae4c8164SVaishali Thakkar pathname); 2982de6c8deSJack Wang kfree(srv_sess); 2992de6c8deSJack Wang return err; 3002de6c8deSJack Wang } 3012de6c8deSJack Wang 3022de6c8deSJack Wang xa_init_flags(&srv_sess->index_idr, XA_FLAGS_ALLOC); 3032de6c8deSJack Wang INIT_LIST_HEAD(&srv_sess->sess_dev_list); 3042de6c8deSJack Wang mutex_init(&srv_sess->lock); 3052de6c8deSJack Wang mutex_lock(&sess_lock); 3062de6c8deSJack Wang list_add(&srv_sess->list, &sess_list); 3072de6c8deSJack Wang mutex_unlock(&sess_lock); 3082de6c8deSJack Wang 3092de6c8deSJack Wang srv_sess->rtrs = rtrs; 310ae4c8164SVaishali Thakkar strscpy(srv_sess->sessname, pathname, sizeof(srv_sess->sessname)); 3112de6c8deSJack Wang 3122de6c8deSJack Wang rtrs_srv_set_sess_priv(rtrs, srv_sess); 3132de6c8deSJack Wang 3142de6c8deSJack Wang return 0; 3152de6c8deSJack Wang } 3162de6c8deSJack Wang 317f7ecac6aSVaishali Thakkar static int rnbd_srv_link_ev(struct rtrs_srv_sess *rtrs, 3182de6c8deSJack Wang enum rtrs_srv_link_ev ev, void *priv) 3192de6c8deSJack Wang { 3202de6c8deSJack Wang struct rnbd_srv_session *srv_sess = priv; 3212de6c8deSJack Wang 3222de6c8deSJack Wang switch (ev) { 3232de6c8deSJack Wang case RTRS_SRV_LINK_EV_CONNECTED: 3242de6c8deSJack Wang return create_sess(rtrs); 3252de6c8deSJack Wang 3262de6c8deSJack Wang case RTRS_SRV_LINK_EV_DISCONNECTED: 3272de6c8deSJack Wang if (WARN_ON_ONCE(!srv_sess)) 3282de6c8deSJack Wang return -EINVAL; 3292de6c8deSJack Wang 3302de6c8deSJack Wang destroy_sess(srv_sess); 3312de6c8deSJack Wang return 0; 3322de6c8deSJack Wang 3332de6c8deSJack Wang default: 3342de6c8deSJack Wang pr_warn("Received unknown RTRS session event %d from session %s\n", 3352de6c8deSJack Wang ev, srv_sess->sessname); 3362de6c8deSJack Wang return -EINVAL; 3372de6c8deSJack Wang } 3382de6c8deSJack Wang } 3392de6c8deSJack Wang 340c77bfa8fSGioh Kim void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev, 341c77bfa8fSGioh Kim struct kobj_attribute *attr) 34278699805SLutz Pogrell { 3431a84e7c6SJack Wang struct rnbd_srv_session *sess = sess_dev->sess; 3441a84e7c6SJack Wang 34578699805SLutz Pogrell sess_dev->keep_id = true; 346b168e1d8SGioh Kim /* It is already started to close by client's close message. */ 347b168e1d8SGioh Kim if (!mutex_trylock(&sess->lock)) 348b168e1d8SGioh Kim return; 349c77bfa8fSGioh Kim /* first remove sysfs itself to avoid deadlock */ 350c77bfa8fSGioh Kim sysfs_remove_file_self(&sess_dev->kobj, &attr->attr); 3511a84e7c6SJack Wang rnbd_srv_destroy_dev_session_sysfs(sess_dev); 3521a84e7c6SJack Wang mutex_unlock(&sess->lock); 35378699805SLutz Pogrell } 35478699805SLutz Pogrell 355c81cba85SGioh Kim static int process_msg_close(struct rnbd_srv_session *srv_sess, 3562de6c8deSJack Wang void *data, size_t datalen, const void *usr, 3572de6c8deSJack Wang size_t usrlen) 3582de6c8deSJack Wang { 3592de6c8deSJack Wang const struct rnbd_msg_close *close_msg = usr; 3602de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev; 3612de6c8deSJack Wang 3622de6c8deSJack Wang sess_dev = rnbd_get_sess_dev(le32_to_cpu(close_msg->device_id), 3632de6c8deSJack Wang srv_sess); 3642de6c8deSJack Wang if (IS_ERR(sess_dev)) 3652de6c8deSJack Wang return 0; 3662de6c8deSJack Wang 3672de6c8deSJack Wang rnbd_put_sess_dev(sess_dev); 3682de6c8deSJack Wang mutex_lock(&srv_sess->lock); 3692de6c8deSJack Wang rnbd_srv_destroy_dev_session_sysfs(sess_dev); 3702de6c8deSJack Wang mutex_unlock(&srv_sess->lock); 3712de6c8deSJack Wang return 0; 3722de6c8deSJack Wang } 3732de6c8deSJack Wang 374c81cba85SGioh Kim static int process_msg_open(struct rnbd_srv_session *srv_sess, 3752de6c8deSJack Wang const void *msg, size_t len, 3762de6c8deSJack Wang void *data, size_t datalen); 3772de6c8deSJack Wang 378c81cba85SGioh Kim static int process_msg_sess_info(struct rnbd_srv_session *srv_sess, 3792de6c8deSJack Wang const void *msg, size_t len, 3802de6c8deSJack Wang void *data, size_t datalen); 3812de6c8deSJack Wang 382c81cba85SGioh Kim static int rnbd_srv_rdma_ev(void *priv, 3832de6c8deSJack Wang struct rtrs_srv_op *id, int dir, 3842de6c8deSJack Wang void *data, size_t datalen, const void *usr, 3852de6c8deSJack Wang size_t usrlen) 3862de6c8deSJack Wang { 3872de6c8deSJack Wang struct rnbd_srv_session *srv_sess = priv; 3882de6c8deSJack Wang const struct rnbd_msg_hdr *hdr = usr; 3892de6c8deSJack Wang int ret = 0; 3902de6c8deSJack Wang u16 type; 3912de6c8deSJack Wang 3922de6c8deSJack Wang if (WARN_ON_ONCE(!srv_sess)) 3932de6c8deSJack Wang return -ENODEV; 3942de6c8deSJack Wang 3952de6c8deSJack Wang type = le16_to_cpu(hdr->type); 3962de6c8deSJack Wang 3972de6c8deSJack Wang switch (type) { 3982de6c8deSJack Wang case RNBD_MSG_IO: 399c81cba85SGioh Kim return process_rdma(srv_sess, id, data, datalen, usr, usrlen); 4002de6c8deSJack Wang case RNBD_MSG_CLOSE: 401c81cba85SGioh Kim ret = process_msg_close(srv_sess, data, datalen, usr, usrlen); 4022de6c8deSJack Wang break; 4032de6c8deSJack Wang case RNBD_MSG_OPEN: 404c81cba85SGioh Kim ret = process_msg_open(srv_sess, usr, usrlen, data, datalen); 4052de6c8deSJack Wang break; 4062de6c8deSJack Wang case RNBD_MSG_SESS_INFO: 407c81cba85SGioh Kim ret = process_msg_sess_info(srv_sess, usr, usrlen, data, 408c81cba85SGioh Kim datalen); 4092de6c8deSJack Wang break; 4102de6c8deSJack Wang default: 4112de6c8deSJack Wang pr_warn("Received unexpected message type %d with dir %d from session %s\n", 4122de6c8deSJack Wang type, dir, srv_sess->sessname); 4132de6c8deSJack Wang return -EINVAL; 4142de6c8deSJack Wang } 4152de6c8deSJack Wang 4162de6c8deSJack Wang rtrs_srv_resp_rdma(id, ret); 4172de6c8deSJack Wang return 0; 4182de6c8deSJack Wang } 4192de6c8deSJack Wang 4202de6c8deSJack Wang static struct rnbd_srv_sess_dev 4212de6c8deSJack Wang *rnbd_sess_dev_alloc(struct rnbd_srv_session *srv_sess) 4222de6c8deSJack Wang { 4232de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev; 4242de6c8deSJack Wang int error; 4252de6c8deSJack Wang 4262de6c8deSJack Wang sess_dev = kzalloc(sizeof(*sess_dev), GFP_KERNEL); 4272de6c8deSJack Wang if (!sess_dev) 4282de6c8deSJack Wang return ERR_PTR(-ENOMEM); 4292de6c8deSJack Wang 4302de6c8deSJack Wang error = xa_alloc(&srv_sess->index_idr, &sess_dev->device_id, sess_dev, 4312de6c8deSJack Wang xa_limit_32b, GFP_NOWAIT); 4322de6c8deSJack Wang if (error < 0) { 4332de6c8deSJack Wang pr_warn("Allocating idr failed, err: %d\n", error); 4342de6c8deSJack Wang kfree(sess_dev); 4352de6c8deSJack Wang return ERR_PTR(error); 4362de6c8deSJack Wang } 4372de6c8deSJack Wang 4382de6c8deSJack Wang return sess_dev; 4392de6c8deSJack Wang } 4402de6c8deSJack Wang 4412de6c8deSJack Wang static struct rnbd_srv_dev *rnbd_srv_init_srv_dev(const char *id) 4422de6c8deSJack Wang { 4432de6c8deSJack Wang struct rnbd_srv_dev *dev; 4442de6c8deSJack Wang 4452de6c8deSJack Wang dev = kzalloc(sizeof(*dev), GFP_KERNEL); 4462de6c8deSJack Wang if (!dev) 4472de6c8deSJack Wang return ERR_PTR(-ENOMEM); 4482de6c8deSJack Wang 44957b93ed4SDima Stepanov strscpy(dev->id, id, sizeof(dev->id)); 4502de6c8deSJack Wang kref_init(&dev->kref); 4512de6c8deSJack Wang INIT_LIST_HEAD(&dev->sess_dev_list); 4522de6c8deSJack Wang mutex_init(&dev->lock); 4532de6c8deSJack Wang 4542de6c8deSJack Wang return dev; 4552de6c8deSJack Wang } 4562de6c8deSJack Wang 4572de6c8deSJack Wang static struct rnbd_srv_dev * 4582de6c8deSJack Wang rnbd_srv_find_or_add_srv_dev(struct rnbd_srv_dev *new_dev) 4592de6c8deSJack Wang { 4602de6c8deSJack Wang struct rnbd_srv_dev *dev; 4612de6c8deSJack Wang 4622de6c8deSJack Wang spin_lock(&dev_lock); 4632de6c8deSJack Wang list_for_each_entry(dev, &dev_list, list) { 4642de6c8deSJack Wang if (!strncmp(dev->id, new_dev->id, sizeof(dev->id))) { 4652de6c8deSJack Wang if (!kref_get_unless_zero(&dev->kref)) 4662de6c8deSJack Wang /* 4672de6c8deSJack Wang * We lost the race, device is almost dead. 4682de6c8deSJack Wang * Continue traversing to find a valid one. 4692de6c8deSJack Wang */ 4702de6c8deSJack Wang continue; 4712de6c8deSJack Wang spin_unlock(&dev_lock); 4722de6c8deSJack Wang return dev; 4732de6c8deSJack Wang } 4742de6c8deSJack Wang } 4752de6c8deSJack Wang list_add(&new_dev->list, &dev_list); 4762de6c8deSJack Wang spin_unlock(&dev_lock); 4772de6c8deSJack Wang 4782de6c8deSJack Wang return new_dev; 4792de6c8deSJack Wang } 4802de6c8deSJack Wang 4812de6c8deSJack Wang static int rnbd_srv_check_update_open_perm(struct rnbd_srv_dev *srv_dev, 4822de6c8deSJack Wang struct rnbd_srv_session *srv_sess, 4832de6c8deSJack Wang enum rnbd_access_mode access_mode) 4842de6c8deSJack Wang { 4852de6c8deSJack Wang int ret = -EPERM; 4862de6c8deSJack Wang 4872de6c8deSJack Wang mutex_lock(&srv_dev->lock); 4882de6c8deSJack Wang 4892de6c8deSJack Wang switch (access_mode) { 4902de6c8deSJack Wang case RNBD_ACCESS_RO: 4912de6c8deSJack Wang ret = 0; 4922de6c8deSJack Wang break; 4932de6c8deSJack Wang case RNBD_ACCESS_RW: 4942de6c8deSJack Wang if (srv_dev->open_write_cnt == 0) { 4952de6c8deSJack Wang srv_dev->open_write_cnt++; 4962de6c8deSJack Wang ret = 0; 4972de6c8deSJack Wang } else { 4982de6c8deSJack Wang 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", 4992de6c8deSJack Wang srv_dev->id, srv_sess->sessname, 5002de6c8deSJack Wang srv_dev->open_write_cnt, 5012de6c8deSJack Wang rnbd_access_mode_str(access_mode)); 5022de6c8deSJack Wang } 5032de6c8deSJack Wang break; 5042de6c8deSJack Wang case RNBD_ACCESS_MIGRATION: 5052de6c8deSJack Wang if (srv_dev->open_write_cnt < 2) { 5062de6c8deSJack Wang srv_dev->open_write_cnt++; 5072de6c8deSJack Wang ret = 0; 5082de6c8deSJack Wang } else { 5092de6c8deSJack Wang 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", 5102de6c8deSJack Wang srv_dev->id, srv_sess->sessname, 5112de6c8deSJack Wang srv_dev->open_write_cnt, 5122de6c8deSJack Wang rnbd_access_mode_str(access_mode)); 5132de6c8deSJack Wang } 5142de6c8deSJack Wang break; 5152de6c8deSJack Wang default: 5162de6c8deSJack Wang pr_err("Received mapping request for device '%s' on session %s with invalid access mode: %d\n", 5172de6c8deSJack Wang srv_dev->id, srv_sess->sessname, access_mode); 5182de6c8deSJack Wang ret = -EINVAL; 5192de6c8deSJack Wang } 5202de6c8deSJack Wang 5212de6c8deSJack Wang mutex_unlock(&srv_dev->lock); 5222de6c8deSJack Wang 5232de6c8deSJack Wang return ret; 5242de6c8deSJack Wang } 5252de6c8deSJack Wang 5262de6c8deSJack Wang static struct rnbd_srv_dev * 5272de6c8deSJack Wang rnbd_srv_get_or_create_srv_dev(struct rnbd_dev *rnbd_dev, 5282de6c8deSJack Wang struct rnbd_srv_session *srv_sess, 5292de6c8deSJack Wang enum rnbd_access_mode access_mode) 5302de6c8deSJack Wang { 5312de6c8deSJack Wang int ret; 5322de6c8deSJack Wang struct rnbd_srv_dev *new_dev, *dev; 5332de6c8deSJack Wang 5342de6c8deSJack Wang new_dev = rnbd_srv_init_srv_dev(rnbd_dev->name); 5352de6c8deSJack Wang if (IS_ERR(new_dev)) 5362de6c8deSJack Wang return new_dev; 5372de6c8deSJack Wang 5382de6c8deSJack Wang dev = rnbd_srv_find_or_add_srv_dev(new_dev); 5392de6c8deSJack Wang if (dev != new_dev) 5402de6c8deSJack Wang kfree(new_dev); 5412de6c8deSJack Wang 5422de6c8deSJack Wang ret = rnbd_srv_check_update_open_perm(dev, srv_sess, access_mode); 5432de6c8deSJack Wang if (ret) { 5442de6c8deSJack Wang rnbd_put_srv_dev(dev); 5452de6c8deSJack Wang return ERR_PTR(ret); 5462de6c8deSJack Wang } 5472de6c8deSJack Wang 5482de6c8deSJack Wang return dev; 5492de6c8deSJack Wang } 5502de6c8deSJack Wang 5512de6c8deSJack Wang static void rnbd_srv_fill_msg_open_rsp(struct rnbd_msg_open_rsp *rsp, 5522de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev) 5532de6c8deSJack Wang { 5542de6c8deSJack Wang struct rnbd_dev *rnbd_dev = sess_dev->rnbd_dev; 555512c781fSGioh Kim struct request_queue *q = bdev_get_queue(rnbd_dev->bdev); 5562de6c8deSJack Wang 5572de6c8deSJack Wang rsp->hdr.type = cpu_to_le16(RNBD_MSG_OPEN_RSP); 5582de6c8deSJack Wang rsp->device_id = 5592de6c8deSJack Wang cpu_to_le32(sess_dev->device_id); 5602de6c8deSJack Wang rsp->nsectors = 5612de6c8deSJack Wang cpu_to_le64(get_capacity(rnbd_dev->bdev->bd_disk)); 5622de6c8deSJack Wang rsp->logical_block_size = 5632de6c8deSJack Wang cpu_to_le16(bdev_logical_block_size(rnbd_dev->bdev)); 5642de6c8deSJack Wang rsp->physical_block_size = 5652de6c8deSJack Wang cpu_to_le16(bdev_physical_block_size(rnbd_dev->bdev)); 5662de6c8deSJack Wang rsp->max_segments = 5672de6c8deSJack Wang cpu_to_le16(rnbd_dev_get_max_segs(rnbd_dev)); 5682de6c8deSJack Wang rsp->max_hw_sectors = 5692de6c8deSJack Wang cpu_to_le32(rnbd_dev_get_max_hw_sects(rnbd_dev)); 5702de6c8deSJack Wang rsp->max_write_same_sectors = 5712de6c8deSJack Wang cpu_to_le32(bdev_write_same(rnbd_dev->bdev)); 5722de6c8deSJack Wang rsp->max_discard_sectors = 5732de6c8deSJack Wang cpu_to_le32(rnbd_dev_get_max_discard_sects(rnbd_dev)); 5742de6c8deSJack Wang rsp->discard_granularity = 5752de6c8deSJack Wang cpu_to_le32(rnbd_dev_get_discard_granularity(rnbd_dev)); 5762de6c8deSJack Wang rsp->discard_alignment = 5772de6c8deSJack Wang cpu_to_le32(rnbd_dev_get_discard_alignment(rnbd_dev)); 5782de6c8deSJack Wang rsp->secure_discard = 5792de6c8deSJack Wang cpu_to_le16(rnbd_dev_get_secure_discard(rnbd_dev)); 580512c781fSGioh Kim rsp->rotational = !blk_queue_nonrot(q); 581512c781fSGioh Kim rsp->cache_policy = 0; 582512c781fSGioh Kim if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) 583512c781fSGioh Kim rsp->cache_policy |= RNBD_WRITEBACK; 584512c781fSGioh Kim if (blk_queue_fua(q)) 585512c781fSGioh Kim rsp->cache_policy |= RNBD_FUA; 5862de6c8deSJack Wang } 5872de6c8deSJack Wang 5882de6c8deSJack Wang static struct rnbd_srv_sess_dev * 5892de6c8deSJack Wang rnbd_srv_create_set_sess_dev(struct rnbd_srv_session *srv_sess, 5902de6c8deSJack Wang const struct rnbd_msg_open *open_msg, 5912de6c8deSJack Wang struct rnbd_dev *rnbd_dev, fmode_t open_flags, 5922de6c8deSJack Wang struct rnbd_srv_dev *srv_dev) 5932de6c8deSJack Wang { 5942de6c8deSJack Wang struct rnbd_srv_sess_dev *sdev = rnbd_sess_dev_alloc(srv_sess); 5952de6c8deSJack Wang 5962de6c8deSJack Wang if (IS_ERR(sdev)) 5972de6c8deSJack Wang return sdev; 5982de6c8deSJack Wang 5992de6c8deSJack Wang kref_init(&sdev->kref); 6002de6c8deSJack Wang 60157b93ed4SDima Stepanov strscpy(sdev->pathname, open_msg->dev_name, sizeof(sdev->pathname)); 6022de6c8deSJack Wang 6032de6c8deSJack Wang sdev->rnbd_dev = rnbd_dev; 6042de6c8deSJack Wang sdev->sess = srv_sess; 6052de6c8deSJack Wang sdev->dev = srv_dev; 6062de6c8deSJack Wang sdev->open_flags = open_flags; 6072de6c8deSJack Wang sdev->access_mode = open_msg->access_mode; 6082de6c8deSJack Wang 6092de6c8deSJack Wang return sdev; 6102de6c8deSJack Wang } 6112de6c8deSJack Wang 6122de6c8deSJack Wang static char *rnbd_srv_get_full_path(struct rnbd_srv_session *srv_sess, 6132de6c8deSJack Wang const char *dev_name) 6142de6c8deSJack Wang { 6152de6c8deSJack Wang char *full_path; 6162de6c8deSJack Wang char *a, *b; 6172de6c8deSJack Wang 6182de6c8deSJack Wang full_path = kmalloc(PATH_MAX, GFP_KERNEL); 6192de6c8deSJack Wang if (!full_path) 6202de6c8deSJack Wang return ERR_PTR(-ENOMEM); 6212de6c8deSJack Wang 6222de6c8deSJack Wang /* 6232de6c8deSJack Wang * Replace %SESSNAME% with a real session name in order to 6242de6c8deSJack Wang * create device namespace. 6252de6c8deSJack Wang */ 6262de6c8deSJack Wang a = strnstr(dev_search_path, "%SESSNAME%", sizeof(dev_search_path)); 6272de6c8deSJack Wang if (a) { 6282de6c8deSJack Wang int len = a - dev_search_path; 6292de6c8deSJack Wang 6302de6c8deSJack Wang len = snprintf(full_path, PATH_MAX, "%.*s/%s/%s", len, 6312de6c8deSJack Wang dev_search_path, srv_sess->sessname, dev_name); 6322de6c8deSJack Wang if (len >= PATH_MAX) { 6332de6c8deSJack Wang pr_err("Too long path: %s, %s, %s\n", 6342de6c8deSJack Wang dev_search_path, srv_sess->sessname, dev_name); 6352de6c8deSJack Wang kfree(full_path); 6362de6c8deSJack Wang return ERR_PTR(-EINVAL); 6372de6c8deSJack Wang } 6382de6c8deSJack Wang } else { 6392de6c8deSJack Wang snprintf(full_path, PATH_MAX, "%s/%s", 6402de6c8deSJack Wang dev_search_path, dev_name); 6412de6c8deSJack Wang } 6422de6c8deSJack Wang 6432de6c8deSJack Wang /* eliminitate duplicated slashes */ 6442de6c8deSJack Wang a = strchr(full_path, '/'); 6452de6c8deSJack Wang b = a; 6462de6c8deSJack Wang while (*b != '\0') { 6472de6c8deSJack Wang if (*b == '/' && *a == '/') { 6482de6c8deSJack Wang b++; 6492de6c8deSJack Wang } else { 6502de6c8deSJack Wang a++; 6512de6c8deSJack Wang *a = *b; 6522de6c8deSJack Wang b++; 6532de6c8deSJack Wang } 6542de6c8deSJack Wang } 6552de6c8deSJack Wang a++; 6562de6c8deSJack Wang *a = '\0'; 6572de6c8deSJack Wang 6582de6c8deSJack Wang return full_path; 6592de6c8deSJack Wang } 6602de6c8deSJack Wang 661c81cba85SGioh Kim static int process_msg_sess_info(struct rnbd_srv_session *srv_sess, 6622de6c8deSJack Wang const void *msg, size_t len, 6632de6c8deSJack Wang void *data, size_t datalen) 6642de6c8deSJack Wang { 6652de6c8deSJack Wang const struct rnbd_msg_sess_info *sess_info_msg = msg; 6662de6c8deSJack Wang struct rnbd_msg_sess_info_rsp *rsp = data; 6672de6c8deSJack Wang 6682de6c8deSJack Wang srv_sess->ver = min_t(u8, sess_info_msg->ver, RNBD_PROTO_VER_MAJOR); 6692de6c8deSJack Wang pr_debug("Session %s using protocol version %d (client version: %d, server version: %d)\n", 6702de6c8deSJack Wang srv_sess->sessname, srv_sess->ver, 6712de6c8deSJack Wang sess_info_msg->ver, RNBD_PROTO_VER_MAJOR); 6722de6c8deSJack Wang 6732de6c8deSJack Wang rsp->hdr.type = cpu_to_le16(RNBD_MSG_SESS_INFO_RSP); 6742de6c8deSJack Wang rsp->ver = srv_sess->ver; 6752de6c8deSJack Wang 6762de6c8deSJack Wang return 0; 6772de6c8deSJack Wang } 6782de6c8deSJack Wang 6792de6c8deSJack Wang /** 6802de6c8deSJack Wang * find_srv_sess_dev() - a dev is already opened by this name 6812de6c8deSJack Wang * @srv_sess: the session to search. 6822de6c8deSJack Wang * @dev_name: string containing the name of the device. 6832de6c8deSJack Wang * 6842de6c8deSJack Wang * Return struct rnbd_srv_sess_dev if srv_sess already opened the dev_name 6852de6c8deSJack Wang * NULL if the session didn't open the device yet. 6862de6c8deSJack Wang */ 6872de6c8deSJack Wang static struct rnbd_srv_sess_dev * 6882de6c8deSJack Wang find_srv_sess_dev(struct rnbd_srv_session *srv_sess, const char *dev_name) 6892de6c8deSJack Wang { 6902de6c8deSJack Wang struct rnbd_srv_sess_dev *sess_dev; 6912de6c8deSJack Wang 6922de6c8deSJack Wang if (list_empty(&srv_sess->sess_dev_list)) 6932de6c8deSJack Wang return NULL; 6942de6c8deSJack Wang 6952de6c8deSJack Wang list_for_each_entry(sess_dev, &srv_sess->sess_dev_list, sess_list) 6962de6c8deSJack Wang if (!strcmp(sess_dev->pathname, dev_name)) 6972de6c8deSJack Wang return sess_dev; 6982de6c8deSJack Wang 6992de6c8deSJack Wang return NULL; 7002de6c8deSJack Wang } 7012de6c8deSJack Wang 702c81cba85SGioh Kim static int process_msg_open(struct rnbd_srv_session *srv_sess, 7032de6c8deSJack Wang const void *msg, size_t len, 7042de6c8deSJack Wang void *data, size_t datalen) 7052de6c8deSJack Wang { 7062de6c8deSJack Wang int ret; 7072de6c8deSJack Wang struct rnbd_srv_dev *srv_dev; 7082de6c8deSJack Wang struct rnbd_srv_sess_dev *srv_sess_dev; 7092de6c8deSJack Wang const struct rnbd_msg_open *open_msg = msg; 7102de6c8deSJack Wang fmode_t open_flags; 7112de6c8deSJack Wang char *full_path; 7122de6c8deSJack Wang struct rnbd_dev *rnbd_dev; 7132de6c8deSJack Wang struct rnbd_msg_open_rsp *rsp = data; 7142de6c8deSJack Wang 7152de6c8deSJack Wang pr_debug("Open message received: session='%s' path='%s' access_mode=%d\n", 7162de6c8deSJack Wang srv_sess->sessname, open_msg->dev_name, 7172de6c8deSJack Wang open_msg->access_mode); 7182de6c8deSJack Wang open_flags = FMODE_READ; 7192de6c8deSJack Wang if (open_msg->access_mode != RNBD_ACCESS_RO) 7202de6c8deSJack Wang open_flags |= FMODE_WRITE; 7212de6c8deSJack Wang 7222de6c8deSJack Wang mutex_lock(&srv_sess->lock); 7232de6c8deSJack Wang 7242de6c8deSJack Wang srv_sess_dev = find_srv_sess_dev(srv_sess, open_msg->dev_name); 7252de6c8deSJack Wang if (srv_sess_dev) 7262de6c8deSJack Wang goto fill_response; 7272de6c8deSJack Wang 7282de6c8deSJack Wang if ((strlen(dev_search_path) + strlen(open_msg->dev_name)) 7292de6c8deSJack Wang >= PATH_MAX) { 7302de6c8deSJack Wang pr_err("Opening device for session %s failed, device path too long. '%s/%s' is longer than PATH_MAX (%d)\n", 7312de6c8deSJack Wang srv_sess->sessname, dev_search_path, open_msg->dev_name, 7322de6c8deSJack Wang PATH_MAX); 7332de6c8deSJack Wang ret = -EINVAL; 7342de6c8deSJack Wang goto reject; 7352de6c8deSJack Wang } 7362de6c8deSJack Wang if (strstr(open_msg->dev_name, "..")) { 7372de6c8deSJack Wang pr_err("Opening device for session %s failed, device path %s contains relative path ..\n", 7382de6c8deSJack Wang srv_sess->sessname, open_msg->dev_name); 7392de6c8deSJack Wang ret = -EINVAL; 7402de6c8deSJack Wang goto reject; 7412de6c8deSJack Wang } 7422de6c8deSJack Wang full_path = rnbd_srv_get_full_path(srv_sess, open_msg->dev_name); 7432de6c8deSJack Wang if (IS_ERR(full_path)) { 7442de6c8deSJack Wang ret = PTR_ERR(full_path); 7452de6c8deSJack Wang pr_err("Opening device '%s' for client %s failed, failed to get device full path, err: %d\n", 7462de6c8deSJack Wang open_msg->dev_name, srv_sess->sessname, ret); 7472de6c8deSJack Wang goto reject; 7482de6c8deSJack Wang } 7492de6c8deSJack Wang 7502de6c8deSJack Wang rnbd_dev = rnbd_dev_open(full_path, open_flags, 7512de6c8deSJack Wang &srv_sess->sess_bio_set); 7522de6c8deSJack Wang if (IS_ERR(rnbd_dev)) { 7532de6c8deSJack Wang pr_err("Opening device '%s' on session %s failed, failed to open the block device, err: %ld\n", 7542de6c8deSJack Wang full_path, srv_sess->sessname, PTR_ERR(rnbd_dev)); 7552de6c8deSJack Wang ret = PTR_ERR(rnbd_dev); 7562de6c8deSJack Wang goto free_path; 7572de6c8deSJack Wang } 7582de6c8deSJack Wang 7592de6c8deSJack Wang srv_dev = rnbd_srv_get_or_create_srv_dev(rnbd_dev, srv_sess, 7602de6c8deSJack Wang open_msg->access_mode); 7612de6c8deSJack Wang if (IS_ERR(srv_dev)) { 7622de6c8deSJack Wang pr_err("Opening device '%s' on session %s failed, creating srv_dev failed, err: %ld\n", 7632de6c8deSJack Wang full_path, srv_sess->sessname, PTR_ERR(srv_dev)); 7642de6c8deSJack Wang ret = PTR_ERR(srv_dev); 7652de6c8deSJack Wang goto rnbd_dev_close; 7662de6c8deSJack Wang } 7672de6c8deSJack Wang 7682de6c8deSJack Wang srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg, 7692de6c8deSJack Wang rnbd_dev, open_flags, 7702de6c8deSJack Wang srv_dev); 7712de6c8deSJack Wang if (IS_ERR(srv_sess_dev)) { 7722de6c8deSJack Wang pr_err("Opening device '%s' on session %s failed, creating sess_dev failed, err: %ld\n", 7732de6c8deSJack Wang full_path, srv_sess->sessname, PTR_ERR(srv_sess_dev)); 7742de6c8deSJack Wang ret = PTR_ERR(srv_sess_dev); 7752de6c8deSJack Wang goto srv_dev_put; 7762de6c8deSJack Wang } 7772de6c8deSJack Wang 7782de6c8deSJack Wang /* Create the srv_dev sysfs files if they haven't been created yet. The 7792de6c8deSJack Wang * reason to delay the creation is not to create the sysfs files before 7802de6c8deSJack Wang * we are sure the device can be opened. 7812de6c8deSJack Wang */ 7822de6c8deSJack Wang mutex_lock(&srv_dev->lock); 7832de6c8deSJack Wang if (!srv_dev->dev_kobj.state_in_sysfs) { 7842de6c8deSJack Wang ret = rnbd_srv_create_dev_sysfs(srv_dev, rnbd_dev->bdev, 7852de6c8deSJack Wang rnbd_dev->name); 7862de6c8deSJack Wang if (ret) { 7872de6c8deSJack Wang mutex_unlock(&srv_dev->lock); 7882de6c8deSJack Wang rnbd_srv_err(srv_sess_dev, 7892de6c8deSJack Wang "Opening device failed, failed to create device sysfs files, err: %d\n", 7902de6c8deSJack Wang ret); 7912de6c8deSJack Wang goto free_srv_sess_dev; 7922de6c8deSJack Wang } 7932de6c8deSJack Wang } 7942de6c8deSJack Wang 7952de6c8deSJack Wang ret = rnbd_srv_create_dev_session_sysfs(srv_sess_dev); 7962de6c8deSJack Wang if (ret) { 7972de6c8deSJack Wang mutex_unlock(&srv_dev->lock); 7982de6c8deSJack Wang rnbd_srv_err(srv_sess_dev, 7992de6c8deSJack Wang "Opening device failed, failed to create dev client sysfs files, err: %d\n", 8002de6c8deSJack Wang ret); 8012de6c8deSJack Wang goto free_srv_sess_dev; 8022de6c8deSJack Wang } 8032de6c8deSJack Wang 8042de6c8deSJack Wang list_add(&srv_sess_dev->dev_list, &srv_dev->sess_dev_list); 8052de6c8deSJack Wang mutex_unlock(&srv_dev->lock); 8062de6c8deSJack Wang 8072de6c8deSJack Wang list_add(&srv_sess_dev->sess_list, &srv_sess->sess_dev_list); 8082de6c8deSJack Wang 8092de6c8deSJack Wang rnbd_srv_info(srv_sess_dev, "Opened device '%s'\n", srv_dev->id); 8102de6c8deSJack Wang 8112de6c8deSJack Wang kfree(full_path); 8122de6c8deSJack Wang 8132de6c8deSJack Wang fill_response: 8142de6c8deSJack Wang rnbd_srv_fill_msg_open_rsp(rsp, srv_sess_dev); 8152de6c8deSJack Wang mutex_unlock(&srv_sess->lock); 8162de6c8deSJack Wang return 0; 8172de6c8deSJack Wang 8182de6c8deSJack Wang free_srv_sess_dev: 8192de6c8deSJack Wang xa_erase(&srv_sess->index_idr, srv_sess_dev->device_id); 8202de6c8deSJack Wang synchronize_rcu(); 8212de6c8deSJack Wang kfree(srv_sess_dev); 8222de6c8deSJack Wang srv_dev_put: 8232de6c8deSJack Wang if (open_msg->access_mode != RNBD_ACCESS_RO) { 8242de6c8deSJack Wang mutex_lock(&srv_dev->lock); 8252de6c8deSJack Wang srv_dev->open_write_cnt--; 8262de6c8deSJack Wang mutex_unlock(&srv_dev->lock); 8272de6c8deSJack Wang } 8282de6c8deSJack Wang rnbd_put_srv_dev(srv_dev); 8292de6c8deSJack Wang rnbd_dev_close: 8302de6c8deSJack Wang rnbd_dev_close(rnbd_dev); 8312de6c8deSJack Wang free_path: 8322de6c8deSJack Wang kfree(full_path); 8332de6c8deSJack Wang reject: 8342de6c8deSJack Wang mutex_unlock(&srv_sess->lock); 8352de6c8deSJack Wang return ret; 8362de6c8deSJack Wang } 8372de6c8deSJack Wang 8382de6c8deSJack Wang static struct rtrs_srv_ctx *rtrs_ctx; 8392de6c8deSJack Wang 8402de6c8deSJack Wang static struct rtrs_srv_ops rtrs_ops; 8412de6c8deSJack Wang static int __init rnbd_srv_init_module(void) 8422de6c8deSJack Wang { 8432de6c8deSJack Wang int err; 8442de6c8deSJack Wang 8452de6c8deSJack Wang BUILD_BUG_ON(sizeof(struct rnbd_msg_hdr) != 4); 8462de6c8deSJack Wang BUILD_BUG_ON(sizeof(struct rnbd_msg_sess_info) != 36); 8472de6c8deSJack Wang BUILD_BUG_ON(sizeof(struct rnbd_msg_sess_info_rsp) != 36); 8482de6c8deSJack Wang BUILD_BUG_ON(sizeof(struct rnbd_msg_open) != 264); 8492de6c8deSJack Wang BUILD_BUG_ON(sizeof(struct rnbd_msg_close) != 8); 8502de6c8deSJack Wang BUILD_BUG_ON(sizeof(struct rnbd_msg_open_rsp) != 56); 8512de6c8deSJack Wang rtrs_ops = (struct rtrs_srv_ops) { 8522de6c8deSJack Wang .rdma_ev = rnbd_srv_rdma_ev, 8532de6c8deSJack Wang .link_ev = rnbd_srv_link_ev, 8542de6c8deSJack Wang }; 8552de6c8deSJack Wang rtrs_ctx = rtrs_srv_open(&rtrs_ops, port_nr); 8562de6c8deSJack Wang if (IS_ERR(rtrs_ctx)) { 8572de6c8deSJack Wang err = PTR_ERR(rtrs_ctx); 8582de6c8deSJack Wang pr_err("rtrs_srv_open(), err: %d\n", err); 8592de6c8deSJack Wang return err; 8602de6c8deSJack Wang } 8612de6c8deSJack Wang 8622de6c8deSJack Wang err = rnbd_srv_create_sysfs_files(); 8632de6c8deSJack Wang if (err) { 8642de6c8deSJack Wang pr_err("rnbd_srv_create_sysfs_files(), err: %d\n", err); 8652de6c8deSJack Wang rtrs_srv_close(rtrs_ctx); 8662de6c8deSJack Wang return err; 8672de6c8deSJack Wang } 8682de6c8deSJack Wang 8692de6c8deSJack Wang return 0; 8702de6c8deSJack Wang } 8712de6c8deSJack Wang 8722de6c8deSJack Wang static void __exit rnbd_srv_cleanup_module(void) 8732de6c8deSJack Wang { 8742de6c8deSJack Wang rtrs_srv_close(rtrs_ctx); 8752de6c8deSJack Wang WARN_ON(!list_empty(&sess_list)); 8762de6c8deSJack Wang rnbd_srv_destroy_sysfs_files(); 8772de6c8deSJack Wang } 8782de6c8deSJack Wang 8792de6c8deSJack Wang module_init(rnbd_srv_init_module); 8802de6c8deSJack Wang module_exit(rnbd_srv_cleanup_module); 881