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![Gioh Kim](/assets/img/avatar_default.png)
The IO performance test with fio after removing the likely and unlikely macros in all if-statement shows no performance drop. They do not help for the performance of rnbd. The fio test did random read on 32 rnbd devices and 64 processes. Test environment: - AMD Opteron(tm) Processor 6386 SE - 125G memory - kernel version: 5.4.86 - gcc version: gcc (Debian 8.3.0-6) 8.3.0 - Infiniband controller: InfiniBand: Mellanox Technologies MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB QDR / 10GigE] (rev b0) before read: IOPS=549k, BW=2146MiB/s read: IOPS=544k, BW=2125MiB/s read: IOPS=553k, BW=2158MiB/s read: IOPS=535k, BW=2089MiB/s read: IOPS=543k, BW=2122MiB/s read: IOPS=552k, BW=2154MiB/s average: IOPS=546k, BW=2132MiB/s after read: IOPS=556k, BW=2172MiB/s read: IOPS=561k, BW=2191MiB/s read: IOPS=552k, BW=2156MiB/s read: IOPS=551k, BW=2154MiB/s read: IOPS=562k, BW=2194MiB/s ----------- average: IOPS=556k, BW=2173MiB/s The IOPS and bandwidth got better slightly after removing likely/unlikely. (IOPS= +1.8% BW= +1.9%) But we cannot make sure that removing the likely/unlikely help the performance because it depends on various situations. We only make sure that removing the likely/unlikely does not drop the performance. Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com> Reviewed-by: Md Haris Iqbal <haris.iqbal@ionos.com> Link: https://lore.kernel.org/r/20210428061359.206794-5-gi-oh.kim@ionos.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
871 lines
23 KiB
C
871 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* RDMA Network Block Driver
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*
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* Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
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* Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
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* Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
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*/
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#undef pr_fmt
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#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include "rnbd-srv.h"
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#include "rnbd-srv-dev.h"
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MODULE_DESCRIPTION("RDMA Network Block Device Server");
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MODULE_LICENSE("GPL");
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static u16 port_nr = RTRS_PORT;
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module_param_named(port_nr, port_nr, ushort, 0444);
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MODULE_PARM_DESC(port_nr,
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"The port number the server is listening on (default: "
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__stringify(RTRS_PORT)")");
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#define DEFAULT_DEV_SEARCH_PATH "/"
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static char dev_search_path[PATH_MAX] = DEFAULT_DEV_SEARCH_PATH;
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static int dev_search_path_set(const char *val, const struct kernel_param *kp)
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{
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const char *p = strrchr(val, '\n') ? : val + strlen(val);
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if (strlen(val) >= sizeof(dev_search_path))
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return -EINVAL;
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snprintf(dev_search_path, sizeof(dev_search_path), "%.*s",
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(int)(p - val), val);
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pr_info("dev_search_path changed to '%s'\n", dev_search_path);
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return 0;
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}
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static struct kparam_string dev_search_path_kparam_str = {
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.maxlen = sizeof(dev_search_path),
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.string = dev_search_path
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};
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static const struct kernel_param_ops dev_search_path_ops = {
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.set = dev_search_path_set,
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.get = param_get_string,
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};
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module_param_cb(dev_search_path, &dev_search_path_ops,
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&dev_search_path_kparam_str, 0444);
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MODULE_PARM_DESC(dev_search_path,
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"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: "
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DEFAULT_DEV_SEARCH_PATH ")");
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static DEFINE_MUTEX(sess_lock);
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static DEFINE_SPINLOCK(dev_lock);
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static LIST_HEAD(sess_list);
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static LIST_HEAD(dev_list);
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struct rnbd_io_private {
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struct rtrs_srv_op *id;
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struct rnbd_srv_sess_dev *sess_dev;
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};
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static void rnbd_sess_dev_release(struct kref *kref)
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{
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struct rnbd_srv_sess_dev *sess_dev;
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sess_dev = container_of(kref, struct rnbd_srv_sess_dev, kref);
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complete(sess_dev->destroy_comp);
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}
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static inline void rnbd_put_sess_dev(struct rnbd_srv_sess_dev *sess_dev)
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{
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kref_put(&sess_dev->kref, rnbd_sess_dev_release);
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}
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void rnbd_endio(void *priv, int error)
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{
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struct rnbd_io_private *rnbd_priv = priv;
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struct rnbd_srv_sess_dev *sess_dev = rnbd_priv->sess_dev;
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rnbd_put_sess_dev(sess_dev);
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rtrs_srv_resp_rdma(rnbd_priv->id, error);
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kfree(priv);
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}
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static struct rnbd_srv_sess_dev *
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rnbd_get_sess_dev(int dev_id, struct rnbd_srv_session *srv_sess)
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{
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struct rnbd_srv_sess_dev *sess_dev;
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int ret = 0;
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rcu_read_lock();
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sess_dev = xa_load(&srv_sess->index_idr, dev_id);
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if (sess_dev)
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ret = kref_get_unless_zero(&sess_dev->kref);
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rcu_read_unlock();
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if (!sess_dev || !ret)
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return ERR_PTR(-ENXIO);
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return sess_dev;
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}
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static int process_rdma(struct rnbd_srv_session *srv_sess,
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struct rtrs_srv_op *id, void *data, u32 datalen,
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const void *usr, size_t usrlen)
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{
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const struct rnbd_msg_io *msg = usr;
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struct rnbd_io_private *priv;
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struct rnbd_srv_sess_dev *sess_dev;
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u32 dev_id;
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int err;
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struct rnbd_dev_blk_io *io;
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struct bio *bio;
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short prio;
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priv = kmalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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dev_id = le32_to_cpu(msg->device_id);
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sess_dev = rnbd_get_sess_dev(dev_id, srv_sess);
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if (IS_ERR(sess_dev)) {
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pr_err_ratelimited("Got I/O request on session %s for unknown device id %d\n",
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srv_sess->sessname, dev_id);
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err = -ENOTCONN;
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goto err;
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}
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priv->sess_dev = sess_dev;
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priv->id = id;
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/* Generate bio with pages pointing to the rdma buffer */
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bio = rnbd_bio_map_kern(data, sess_dev->rnbd_dev->ibd_bio_set, datalen, GFP_KERNEL);
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if (IS_ERR(bio)) {
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err = PTR_ERR(bio);
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rnbd_srv_err(sess_dev, "Failed to generate bio, err: %d\n", err);
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goto sess_dev_put;
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}
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io = container_of(bio, struct rnbd_dev_blk_io, bio);
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io->dev = sess_dev->rnbd_dev;
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io->priv = priv;
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bio->bi_end_io = rnbd_dev_bi_end_io;
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bio->bi_private = io;
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bio->bi_opf = rnbd_to_bio_flags(le32_to_cpu(msg->rw));
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bio->bi_iter.bi_sector = le64_to_cpu(msg->sector);
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bio->bi_iter.bi_size = le32_to_cpu(msg->bi_size);
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prio = srv_sess->ver < RNBD_PROTO_VER_MAJOR ||
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usrlen < sizeof(*msg) ? 0 : le16_to_cpu(msg->prio);
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bio_set_prio(bio, prio);
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bio_set_dev(bio, sess_dev->rnbd_dev->bdev);
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submit_bio(bio);
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return 0;
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sess_dev_put:
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rnbd_put_sess_dev(sess_dev);
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err:
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kfree(priv);
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return err;
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}
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static void destroy_device(struct kref *kref)
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{
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struct rnbd_srv_dev *dev = container_of(kref, struct rnbd_srv_dev, kref);
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WARN_ONCE(!list_empty(&dev->sess_dev_list),
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"Device %s is being destroyed but still in use!\n",
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dev->id);
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spin_lock(&dev_lock);
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list_del(&dev->list);
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spin_unlock(&dev_lock);
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mutex_destroy(&dev->lock);
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if (dev->dev_kobj.state_in_sysfs)
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/*
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* Destroy kobj only if it was really created.
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*/
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rnbd_srv_destroy_dev_sysfs(dev);
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else
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kfree(dev);
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}
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static void rnbd_put_srv_dev(struct rnbd_srv_dev *dev)
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{
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kref_put(&dev->kref, destroy_device);
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}
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void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id)
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{
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DECLARE_COMPLETION_ONSTACK(dc);
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if (keep_id)
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/* free the resources for the id but don't */
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/* allow to re-use the id itself because it */
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/* is still used by the client */
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xa_cmpxchg(&sess_dev->sess->index_idr, sess_dev->device_id,
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sess_dev, NULL, 0);
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else
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xa_erase(&sess_dev->sess->index_idr, sess_dev->device_id);
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synchronize_rcu();
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sess_dev->destroy_comp = &dc;
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rnbd_put_sess_dev(sess_dev);
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wait_for_completion(&dc); /* wait for inflights to drop to zero */
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rnbd_dev_close(sess_dev->rnbd_dev);
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list_del(&sess_dev->sess_list);
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mutex_lock(&sess_dev->dev->lock);
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list_del(&sess_dev->dev_list);
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if (sess_dev->open_flags & FMODE_WRITE)
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sess_dev->dev->open_write_cnt--;
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mutex_unlock(&sess_dev->dev->lock);
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rnbd_put_srv_dev(sess_dev->dev);
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rnbd_srv_info(sess_dev, "Device closed\n");
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kfree(sess_dev);
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}
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static void destroy_sess(struct rnbd_srv_session *srv_sess)
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{
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struct rnbd_srv_sess_dev *sess_dev, *tmp;
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if (list_empty(&srv_sess->sess_dev_list))
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goto out;
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mutex_lock(&srv_sess->lock);
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list_for_each_entry_safe(sess_dev, tmp, &srv_sess->sess_dev_list,
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sess_list)
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rnbd_srv_destroy_dev_session_sysfs(sess_dev);
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mutex_unlock(&srv_sess->lock);
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out:
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xa_destroy(&srv_sess->index_idr);
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bioset_exit(&srv_sess->sess_bio_set);
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pr_info("RTRS Session %s disconnected\n", srv_sess->sessname);
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mutex_lock(&sess_lock);
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list_del(&srv_sess->list);
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mutex_unlock(&sess_lock);
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mutex_destroy(&srv_sess->lock);
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kfree(srv_sess);
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}
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static int create_sess(struct rtrs_srv *rtrs)
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{
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struct rnbd_srv_session *srv_sess;
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char sessname[NAME_MAX];
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int err;
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err = rtrs_srv_get_sess_name(rtrs, sessname, sizeof(sessname));
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if (err) {
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pr_err("rtrs_srv_get_sess_name(%s): %d\n", sessname, err);
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return err;
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}
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srv_sess = kzalloc(sizeof(*srv_sess), GFP_KERNEL);
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if (!srv_sess)
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return -ENOMEM;
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srv_sess->queue_depth = rtrs_srv_get_queue_depth(rtrs);
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err = bioset_init(&srv_sess->sess_bio_set, srv_sess->queue_depth,
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offsetof(struct rnbd_dev_blk_io, bio),
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BIOSET_NEED_BVECS);
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if (err) {
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pr_err("Allocating srv_session for session %s failed\n",
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sessname);
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kfree(srv_sess);
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return err;
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}
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xa_init_flags(&srv_sess->index_idr, XA_FLAGS_ALLOC);
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INIT_LIST_HEAD(&srv_sess->sess_dev_list);
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mutex_init(&srv_sess->lock);
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mutex_lock(&sess_lock);
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list_add(&srv_sess->list, &sess_list);
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mutex_unlock(&sess_lock);
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srv_sess->rtrs = rtrs;
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strscpy(srv_sess->sessname, sessname, sizeof(srv_sess->sessname));
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rtrs_srv_set_sess_priv(rtrs, srv_sess);
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return 0;
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}
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static int rnbd_srv_link_ev(struct rtrs_srv *rtrs,
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enum rtrs_srv_link_ev ev, void *priv)
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{
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struct rnbd_srv_session *srv_sess = priv;
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switch (ev) {
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case RTRS_SRV_LINK_EV_CONNECTED:
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return create_sess(rtrs);
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case RTRS_SRV_LINK_EV_DISCONNECTED:
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if (WARN_ON_ONCE(!srv_sess))
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return -EINVAL;
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destroy_sess(srv_sess);
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return 0;
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default:
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pr_warn("Received unknown RTRS session event %d from session %s\n",
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ev, srv_sess->sessname);
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return -EINVAL;
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}
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}
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void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev,
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struct kobj_attribute *attr)
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{
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struct rnbd_srv_session *sess = sess_dev->sess;
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sess_dev->keep_id = true;
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/* It is already started to close by client's close message. */
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if (!mutex_trylock(&sess->lock))
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return;
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/* first remove sysfs itself to avoid deadlock */
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sysfs_remove_file_self(&sess_dev->kobj, &attr->attr);
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rnbd_srv_destroy_dev_session_sysfs(sess_dev);
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mutex_unlock(&sess->lock);
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}
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static int process_msg_close(struct rnbd_srv_session *srv_sess,
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void *data, size_t datalen, const void *usr,
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size_t usrlen)
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{
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const struct rnbd_msg_close *close_msg = usr;
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struct rnbd_srv_sess_dev *sess_dev;
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sess_dev = rnbd_get_sess_dev(le32_to_cpu(close_msg->device_id),
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srv_sess);
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if (IS_ERR(sess_dev))
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return 0;
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rnbd_put_sess_dev(sess_dev);
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mutex_lock(&srv_sess->lock);
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rnbd_srv_destroy_dev_session_sysfs(sess_dev);
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mutex_unlock(&srv_sess->lock);
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return 0;
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}
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static int process_msg_open(struct rnbd_srv_session *srv_sess,
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const void *msg, size_t len,
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void *data, size_t datalen);
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static int process_msg_sess_info(struct rnbd_srv_session *srv_sess,
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const void *msg, size_t len,
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void *data, size_t datalen);
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static int rnbd_srv_rdma_ev(void *priv,
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struct rtrs_srv_op *id, int dir,
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void *data, size_t datalen, const void *usr,
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size_t usrlen)
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{
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struct rnbd_srv_session *srv_sess = priv;
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const struct rnbd_msg_hdr *hdr = usr;
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int ret = 0;
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u16 type;
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if (WARN_ON_ONCE(!srv_sess))
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return -ENODEV;
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type = le16_to_cpu(hdr->type);
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switch (type) {
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case RNBD_MSG_IO:
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return process_rdma(srv_sess, id, data, datalen, usr, usrlen);
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case RNBD_MSG_CLOSE:
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ret = process_msg_close(srv_sess, data, datalen, usr, usrlen);
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break;
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case RNBD_MSG_OPEN:
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ret = process_msg_open(srv_sess, usr, usrlen, data, datalen);
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break;
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case RNBD_MSG_SESS_INFO:
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ret = process_msg_sess_info(srv_sess, usr, usrlen, data,
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datalen);
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break;
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default:
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pr_warn("Received unexpected message type %d with dir %d from session %s\n",
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type, dir, srv_sess->sessname);
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return -EINVAL;
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}
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rtrs_srv_resp_rdma(id, ret);
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return 0;
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}
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static struct rnbd_srv_sess_dev
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*rnbd_sess_dev_alloc(struct rnbd_srv_session *srv_sess)
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{
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struct rnbd_srv_sess_dev *sess_dev;
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int error;
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sess_dev = kzalloc(sizeof(*sess_dev), GFP_KERNEL);
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if (!sess_dev)
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return ERR_PTR(-ENOMEM);
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error = xa_alloc(&srv_sess->index_idr, &sess_dev->device_id, sess_dev,
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xa_limit_32b, GFP_NOWAIT);
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if (error < 0) {
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pr_warn("Allocating idr failed, err: %d\n", error);
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kfree(sess_dev);
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return ERR_PTR(error);
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}
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return sess_dev;
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}
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static struct rnbd_srv_dev *rnbd_srv_init_srv_dev(const char *id)
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{
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struct rnbd_srv_dev *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return ERR_PTR(-ENOMEM);
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|
|
strscpy(dev->id, id, sizeof(dev->id));
|
|
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 rnbd_dev *rnbd_dev,
|
|
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(rnbd_dev->name);
|
|
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 rnbd_dev *rnbd_dev = sess_dev->rnbd_dev;
|
|
struct request_queue *q = bdev_get_queue(rnbd_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(get_capacity(rnbd_dev->bdev->bd_disk));
|
|
rsp->logical_block_size =
|
|
cpu_to_le16(bdev_logical_block_size(rnbd_dev->bdev));
|
|
rsp->physical_block_size =
|
|
cpu_to_le16(bdev_physical_block_size(rnbd_dev->bdev));
|
|
rsp->max_segments =
|
|
cpu_to_le16(rnbd_dev_get_max_segs(rnbd_dev));
|
|
rsp->max_hw_sectors =
|
|
cpu_to_le32(rnbd_dev_get_max_hw_sects(rnbd_dev));
|
|
rsp->max_write_same_sectors =
|
|
cpu_to_le32(bdev_write_same(rnbd_dev->bdev));
|
|
rsp->max_discard_sectors =
|
|
cpu_to_le32(rnbd_dev_get_max_discard_sects(rnbd_dev));
|
|
rsp->discard_granularity =
|
|
cpu_to_le32(rnbd_dev_get_discard_granularity(rnbd_dev));
|
|
rsp->discard_alignment =
|
|
cpu_to_le32(rnbd_dev_get_discard_alignment(rnbd_dev));
|
|
rsp->secure_discard =
|
|
cpu_to_le16(rnbd_dev_get_secure_discard(rnbd_dev));
|
|
rsp->rotational = !blk_queue_nonrot(q);
|
|
rsp->cache_policy = 0;
|
|
if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
|
|
rsp->cache_policy |= RNBD_WRITEBACK;
|
|
if (blk_queue_fua(q))
|
|
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 rnbd_dev *rnbd_dev, 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->rnbd_dev = rnbd_dev;
|
|
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);
|
|
pr_debug("Session %s using protocol version %d (client version: %d, server version: %d)\n",
|
|
srv_sess->sessname, srv_sess->ver,
|
|
sess_info_msg->ver, RNBD_PROTO_VER_MAJOR);
|
|
|
|
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;
|
|
|
|
if (list_empty(&srv_sess->sess_dev_list))
|
|
return NULL;
|
|
|
|
list_for_each_entry(sess_dev, &srv_sess->sess_dev_list, sess_list)
|
|
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;
|
|
fmode_t open_flags;
|
|
char *full_path;
|
|
struct rnbd_dev *rnbd_dev;
|
|
struct rnbd_msg_open_rsp *rsp = data;
|
|
|
|
pr_debug("Open message received: session='%s' path='%s' access_mode=%d\n",
|
|
srv_sess->sessname, open_msg->dev_name,
|
|
open_msg->access_mode);
|
|
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;
|
|
}
|
|
|
|
rnbd_dev = rnbd_dev_open(full_path, open_flags,
|
|
&srv_sess->sess_bio_set);
|
|
if (IS_ERR(rnbd_dev)) {
|
|
pr_err("Opening device '%s' on session %s failed, failed to open the block device, err: %ld\n",
|
|
full_path, srv_sess->sessname, PTR_ERR(rnbd_dev));
|
|
ret = PTR_ERR(rnbd_dev);
|
|
goto free_path;
|
|
}
|
|
|
|
srv_dev = rnbd_srv_get_or_create_srv_dev(rnbd_dev, 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 rnbd_dev_close;
|
|
}
|
|
|
|
srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg,
|
|
rnbd_dev, 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, rnbd_dev->bdev,
|
|
rnbd_dev->name);
|
|
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);
|
|
|
|
list_add(&srv_sess_dev->sess_list, &srv_sess->sess_dev_list);
|
|
|
|
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);
|
|
rnbd_dev_close:
|
|
rnbd_dev_close(rnbd_dev);
|
|
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);
|