From: Jack Wang <jinpu.w...@profitbricks.com>
Process incoming IO from ibtrs server, and hands them down to
underlying block device.
Signed-off-by: Jack Wang <jinpu.w...@profitbricks.com>
Signed-off-by: Kleber Souza <kleber.so...@profitbricks.com>
Signed-off-by: Danil Kipnis <danil.kip...@profitbricks.com>
Signed-off-by: Roman Pen <roman.peny...@profitbricks.com>
---
drivers/block/ibnbd_server/ibnbd_srv.c | 1074 ++++++++++++++++++++++++++++++++
1 file changed, 1074 insertions(+)
create mode 100644 drivers/block/ibnbd_server/ibnbd_srv.c
diff --git a/drivers/block/ibnbd_server/ibnbd_srv.c
b/drivers/block/ibnbd_server/ibnbd_srv.c
new file mode 100644
index 0000000..13832b6
--- /dev/null
+++ b/drivers/block/ibnbd_server/ibnbd_srv.c
@@ -0,0 +1,1074 @@
+/*
+ * InfiniBand Network Block Driver
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler < m...@fholler.de>
+ * Jack Wang <jinpu.w...@profitbricks.com>
+ * Kleber Souza <kleber.so...@profitbricks.com>
+ * Danil Kipnis <danil.kip...@profitbricks.com>
+ * Roman Pen <roman.peny...@profitbricks.com>
+ * Milind Dumbare <milind.dumb...@gmail.com>
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/idr.h>
+#include <rdma/ibtrs.h>
+#include "../ibnbd_inc/ibnbd-proto.h"
+#include <rdma/ibtrs_srv.h>
+#include "../ibnbd_inc/ibnbd.h"
+#include "ibnbd_srv.h"
+#include "ibnbd_srv_log.h"
+#include "ibnbd_srv_sysfs.h"
+#include "ibnbd_dev.h"
+
+MODULE_AUTHOR("ib...@profitbricks.com");
+MODULE_VERSION(__stringify(IBNBD_VER));
+MODULE_DESCRIPTION("InfiniBand Network Block Device Server");
+MODULE_LICENSE("GPL");
+
+#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)
+{
+ char *dup;
+
+ if (strlen(val) >= sizeof(dev_search_path))
+ return -EINVAL;
+
+ dup = kstrdup(val, GFP_KERNEL);
+
+ if (dup[strlen(dup) - 1] == '\n')
+ dup[strlen(dup) - 1] = '\0';
+
+ strlcpy(dev_search_path, dup, sizeof(dev_search_path));
+
+ kfree(dup);
+ INFO_NP("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 device_search_path."
+ " When a device is mapped this path is prepended to the"
+ " device_path from the map_device operation."
+ " (default: " DEFAULT_DEV_SEARCH_PATH ")");
+
+static int def_io_mode = IBNBD_BLOCKIO;
+module_param(def_io_mode, int, 0444);
+MODULE_PARM_DESC(def_io_mode, "By default, export devices in"
+ " blockio(" __stringify(_IBNBD_BLOCKIO) ") or"
+ " fileio(" __stringify(_IBNBD_FILEIO) ") mode."
+ " (default: " __stringify(_IBNBD_BLOCKIO) " (blockio))");
+
+static DEFINE_MUTEX(sess_lock);
+static DEFINE_SPINLOCK(dev_lock);
+
+static LIST_HEAD(sess_list);
+static LIST_HEAD(dev_list);
+
+
+struct ibnbd_io_private {
+ struct ibtrs_ops_id *id;
+ struct ibnbd_srv_sess_dev *sess_dev;
+};
+
+static struct ibtrs_srv_ops ibnbd_srv_ops;
+
+static void ibnbd_sess_dev_release(struct kref *kref)
+{
+ struct ibnbd_srv_sess_dev *sess_dev;
+
+ sess_dev = container_of(kref, struct ibnbd_srv_sess_dev, kref);
+ complete(sess_dev->destroy_comp);
+}
+
+static inline void ibnbd_put_sess_dev(struct ibnbd_srv_sess_dev *sess_dev)
+{
+ kref_put(&sess_dev->kref, ibnbd_sess_dev_release);
+}
+
+static void ibnbd_endio(void *priv, int error)
+{
+ int ret;
+ struct ibnbd_io_private *ibnbd_priv = priv;
+ struct ibnbd_srv_sess_dev *sess_dev = ibnbd_priv->sess_dev;
+
+ ibnbd_put_sess_dev(sess_dev);
+
+ ret = ibtrs_srv_resp_rdma(ibnbd_priv->id, error);
+ if (unlikely(ret))
+ ERR_RL(sess_dev, "Sending I/O response failed, errno: %d\n",
+ ret);
+
+ kfree(priv);
+}
+
+static struct ibnbd_srv_sess_dev *
+ibnbd_get_sess_dev(int dev_id, struct ibnbd_srv_session *srv_sess)
+{
+ struct ibnbd_srv_sess_dev *sess_dev;
+ int ret = 0;
+
+ read_lock(&srv_sess->index_lock);
+ sess_dev = idr_find(&srv_sess->index_idr, dev_id);
+ if (likely(sess_dev))
+ ret = kref_get_unless_zero(&sess_dev->kref);
+ read_unlock(&srv_sess->index_lock);
+
+ if (unlikely(!sess_dev || !ret))
+ return ERR_PTR(-ENXIO);
+
+ return sess_dev;
+}
+
+static int process_rdma(struct ibtrs_session *sess,
+ struct ibnbd_srv_session *srv_sess,
+ struct ibtrs_ops_id *id, void *data, u32 len)
+{
+ struct ibnbd_io_private *priv;
+ struct ibnbd_srv_sess_dev *sess_dev;
+ struct ibnbd_msg_io *msg;
+ size_t data_len;
+ int err;
+ u32 dev_id;
+
+ priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+ if (unlikely(!priv))
+ return -ENOMEM;
+
+ data_len = len - sizeof(*msg);
+ /* ibnbd message is after disk data */
+ msg = (struct ibnbd_msg_io *)(data + data_len);
+
+ dev_id = msg->device_id;
+
+ sess_dev = ibnbd_get_sess_dev(dev_id, srv_sess);
+ if (unlikely(IS_ERR(sess_dev))) {
+ ERR_NP_RL("Got I/O request from client %s for unknown device id"
+ " %d\n", srv_sess->str_addr, dev_id);
+ err = -ENOTCONN;
+ goto err;
+ }
+
+ priv->sess_dev = sess_dev;
+ priv->id = id;
+
+ err = ibnbd_dev_submit_io(sess_dev->ibnbd_dev, msg->sector, data,
+ data_len, msg->bi_size, msg->rw, priv);
+ if (unlikely(err)) {
+ ERR(sess_dev, "Submitting I/O to device failed, errno: %d\n",
+ err);
+ goto sess_dev_put;
+ }
+
+ return 0;
+
+sess_dev_put:
+ ibnbd_put_sess_dev(sess_dev);
+err:
+ kfree(priv);
+ return err;
+}
+
+static void destroy_device(struct ibnbd_srv_dev *dev)
+{
+ WARN(!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);
+
+ if (dev->dev_kobj.state_in_sysfs)
+ /*
+ * Destroy kobj only if it was really created.
+ * The following call should be sync, because
+ * we free the memory afterwards.
+ */
+ ibnbd_srv_destroy_dev_sysfs(dev);
+
+ kfree(dev);
+}
+
+static void destroy_device_cb(struct kref *kref)
+{
+ struct ibnbd_srv_dev *dev;
+
+ dev = container_of(kref, struct ibnbd_srv_dev, kref);
+
+ destroy_device(dev);
+}
+
+static void ibnbd_put_srv_dev(struct ibnbd_srv_dev *dev)
+{
+ kref_put(&dev->kref, destroy_device_cb);
+}
+
+static void ibnbd_destroy_sess_dev(struct ibnbd_srv_sess_dev *sess_dev,
+ bool locked)
+{
+ struct completion dc;
+
+ write_lock(&sess_dev->sess->index_lock);
+ idr_remove(&sess_dev->sess->index_idr, sess_dev->device_id);
+ write_unlock(&sess_dev->sess->index_lock);
+
+ init_completion(&dc);
+ sess_dev->destroy_comp = &dc;
+ ibnbd_put_sess_dev(sess_dev);
+ wait_for_completion(&dc);
+
+ ibnbd_dev_close(sess_dev->ibnbd_dev);
+ if (!locked)
+ mutex_lock(&sess_dev->sess->lock);
+ list_del(&sess_dev->sess_list);
+ if (!locked)
+ mutex_unlock(&sess_dev->sess->lock);
+
+ 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);
+
+ ibnbd_put_srv_dev(sess_dev->dev);
+
+ INFO(sess_dev, "Device closed\n");
+ kfree(sess_dev);
+}
+
+static void destroy_sess(struct ibnbd_srv_session *srv_sess)
+{
+ struct ibnbd_srv_sess_dev *sess_dev, *tmp;
+
+ srv_sess->state = SESS_STATE_DISCONNECTED;
+
+ if (list_empty(&srv_sess->sess_dev_list))
+ goto out;
+
+ mutex_lock(&srv_sess->lock);
+ list_for_each_entry_safe(sess_dev, tmp, &srv_sess->sess_dev_list,
+ sess_list) {
+ ibnbd_srv_destroy_dev_client_sysfs(sess_dev);
+ ibnbd_destroy_sess_dev(sess_dev, true);
+ }
+ mutex_unlock(&srv_sess->lock);
+
+out:
+ idr_destroy(&srv_sess->index_idr);
+ bioset_free(srv_sess->sess_bio_set);
+
+ INFO_NP("IBTRS Session to %s disconnected\n", srv_sess->str_addr);
+
+ mutex_lock(&sess_lock);
+ list_del(&srv_sess->list);
+ mutex_unlock(&sess_lock);
+
+ kfree(srv_sess);
+}
+
+static int create_sess(struct ibtrs_session *sess)
+{
+ struct ibnbd_srv_session *srv_sess;
+
+ srv_sess = kzalloc(sizeof(*srv_sess), GFP_KERNEL);
+ if (!srv_sess) {
+ ERR_NP("Allocating srv_session for client %s failed\n",
+ ibtrs_srv_get_sess_addr(sess));
+ return -ENOMEM;
+ }
+ srv_sess->queue_depth = ibtrs_srv_get_sess_qdepth(sess);
+ srv_sess->sess_bio_set = bioset_create(srv_sess->queue_depth, 0);
+ if (!srv_sess->sess_bio_set) {
+ ERR_NP("Allocating srv_session for client %s failed\n",
+ ibtrs_srv_get_sess_addr(sess));
+ kfree(srv_sess);
+ return -ENOMEM;
+ }
+
+ idr_init(&srv_sess->index_idr);
+ rwlock_init(&srv_sess->index_lock);
+ INIT_LIST_HEAD(&srv_sess->sess_dev_list);
+ mutex_init(&srv_sess->lock);
+ srv_sess->state = SESS_STATE_CONNECTED;
+ mutex_lock(&sess_lock);
+ list_add(&srv_sess->list, &sess_list);
+ mutex_unlock(&sess_lock);
+
+ srv_sess->ibtrs_sess = sess;
+ srv_sess->queue_depth = ibtrs_srv_get_sess_qdepth(sess);
+ strlcpy(srv_sess->str_addr, ibtrs_srv_get_sess_addr(sess),
+ sizeof(srv_sess->str_addr));
+
+ ibtrs_srv_set_sess_priv(sess, srv_sess);
+
+ return 0;
+}
+
+static int ibnbd_srv_sess_ev(struct ibtrs_session *sess,
+ enum ibtrs_srv_sess_ev ev, void *priv)
+{
+ struct ibnbd_srv_session *srv_sess = priv;
+
+ switch (ev) {
+ case IBTRS_SRV_SESS_EV_CONNECTED:
+ INFO_NP("IBTRS session to %s established\n",
+ ibtrs_srv_get_sess_addr(sess));
+ return create_sess(sess);
+
+ case IBTRS_SRV_SESS_EV_DISCONNECTING:
+ if (WARN_ON(!priv ||
+ srv_sess->state != SESS_STATE_CONNECTED))
+ return -EINVAL;
+
+ INFO_NP("IBTRS Session to %s will be disconnected.\n",
+ srv_sess->str_addr);
+ srv_sess->state = SESS_STATE_DISCONNECTED;
+
+ return 0;
+
+ case IBTRS_SRV_SESS_EV_DISCONNECTED:
+ if (WARN_ON(!priv))
+ return -EINVAL;
+
+ destroy_sess(srv_sess);
+ return 0;
+
+ default:
+ WRN_NP("Received unknown IBTRS session event %d from session"
+ " %s\n", ev, srv_sess->str_addr);
+ return -EINVAL;
+ }
+}
+
+static int ibnbd_srv_rdma_ev(struct ibtrs_session *sess, void *priv,
+ struct ibtrs_ops_id *id, enum ibtrs_srv_rdma_ev ev,
+ void *data, size_t len)
+{
+ struct ibnbd_srv_session *srv_sess = priv;
+
+ if (unlikely(WARN_ON(!srv_sess) ||
+ srv_sess->state == SESS_STATE_DISCONNECTED))
+ return -ENODEV;
+
+ switch (ev) {
+ case IBTRS_SRV_RDMA_EV_RECV:
+ case IBTRS_SRV_RDMA_EV_WRITE_REQ:
+ return process_rdma(sess, srv_sess, id, data, len);
+
+ default:
+ WRN_NP("Received unexpected RDMA event %d from session %s\n",
+ ev, srv_sess->str_addr);
+ return -EINVAL;
+ }
+}
+
+static struct ibnbd_srv_sess_dev
+*ibnbd_sess_dev_alloc(struct ibnbd_srv_session *srv_sess)
+{
+ struct ibnbd_srv_sess_dev *sess_dev;
+ int error;
+
+ sess_dev = kzalloc(sizeof(*sess_dev), GFP_KERNEL);
+ if (!sess_dev)
+ return ERR_PTR(-ENOMEM);
+
+ idr_preload(GFP_KERNEL);
+ write_lock(&srv_sess->index_lock);
+
+ error = idr_alloc(&srv_sess->index_idr, sess_dev, 0, -1, GFP_NOWAIT);
+ if (error < 0) {
+ WRN_NP("Allocating idr failed, errno: %d\n", error);
+ goto out_unlock;
+ }
+
+ sess_dev->device_id = error;
+ error = 0;
+
+out_unlock:
+ write_unlock(&srv_sess->index_lock);
+ idr_preload_end();
+ if (error) {
+ kfree(sess_dev);
+ return ERR_PTR(error);
+ }
+
+ return sess_dev;
+}
+
+static struct ibnbd_srv_dev *ibnbd_srv_init_srv_dev(const char *id,
+ enum ibnbd_io_mode mode)
+{
+ struct ibnbd_srv_dev *dev;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ strlcpy(dev->id, id, sizeof(dev->id));
+ dev->mode = mode;
+ kref_init(&dev->kref);
+ INIT_LIST_HEAD(&dev->sess_dev_list);
+ mutex_init(&dev->lock);
+
+ return dev;
+}
+
+static struct ibnbd_srv_dev *
+ibnbd_srv_find_or_add_srv_dev(struct ibnbd_srv_dev *new_dev)
+{
+ struct ibnbd_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 ibnbd_srv_check_update_open_perm(struct ibnbd_srv_dev *srv_dev,
+ struct ibnbd_srv_session *srv_sess,
+ enum ibnbd_io_mode io_mode,
+ enum ibnbd_access_mode access_mode)
+{
+ int ret = -EPERM;
+
+ mutex_lock(&srv_dev->lock);
+
+ if (srv_dev->mode != io_mode) {
+ ERR_NP("Mapping device '%s' for client %s in %s mode forbidden,"
+ " device is already mapped from other client(s) in"
+ " %s mode\n", srv_dev->id, srv_sess->str_addr,
+ ibnbd_io_mode_str(io_mode),
+ ibnbd_io_mode_str(srv_dev->mode));
+ goto out;
+ }
+
+ switch (access_mode) {
+ case IBNBD_ACCESS_RO:
+ ret = 0;
+ break;
+ case IBNBD_ACCESS_RW:
+ if (srv_dev->open_write_cnt == 0) {
+ srv_dev->open_write_cnt++;
+ ret = 0;
+ } else {
+ ERR_NP("Mapping device '%s' for client %s with"
+ " RW permissions failed. Device already opened"
+ " as 'RW' by %d client(s) in %s mode.\n",
+ srv_dev->id, srv_sess->str_addr,
+ srv_dev->open_write_cnt,
+ ibnbd_io_mode_str(srv_dev->mode));
+ }
+ break;
+ case IBNBD_ACCESS_MIGRATION:
+ if (srv_dev->open_write_cnt < 2) {
+ srv_dev->open_write_cnt++;
+ ret = 0;
+ } else {
+ ERR_NP("Mapping device '%s' for client %s with"
+ " migration permissions failed. Device already"
+ " opened as 'RW' by %d client(s) in %s mode.\n",
+ srv_dev->id, srv_sess->str_addr,
+ srv_dev->open_write_cnt,
+ ibnbd_io_mode_str(srv_dev->mode));
+ }
+ break;
+ default:
+ ERR_NP("Received mapping request for device '%s' from client %s"
+ " with invalid access mode: %d\n", srv_dev->id,
+ srv_sess->str_addr, access_mode);
+ ret = -EINVAL;
+ }
+
+out:
+ mutex_unlock(&srv_dev->lock);
+
+ return ret;
+}
+
+static struct ibnbd_srv_dev *
+ibnbd_srv_get_or_create_srv_dev(struct ibnbd_dev *ibnbd_dev,
+ struct ibnbd_srv_session *srv_sess,
+ enum ibnbd_io_mode io_mode,
+ enum ibnbd_access_mode access_mode)
+{
+ int ret;
+ struct ibnbd_srv_dev *new_dev, *dev;
+ const char *dev_name = ibnbd_dev_get_name(ibnbd_dev);
+
+ new_dev = ibnbd_srv_init_srv_dev(dev_name, io_mode);
+ if (IS_ERR(new_dev))
+ return new_dev;
+
+ dev = ibnbd_srv_find_or_add_srv_dev(new_dev);
+ if (dev != new_dev)
+ kfree(new_dev);
+
+ ret = ibnbd_srv_check_update_open_perm(dev, srv_sess, io_mode,
+ access_mode);
+ if (ret) {
+ ibnbd_put_srv_dev(dev);
+ return ERR_PTR(ret);
+ }
+
+ return dev;
+}
+
+static inline void
+ibnbd_srv_fill_msg_open_rsp_header(struct ibnbd_msg_open_rsp *rsp,
+ u32 clt_device_id)
+{
+ rsp->hdr.type = IBNBD_MSG_OPEN_RSP;
+ rsp->clt_device_id = clt_device_id;
+}
+
+static void ibnbd_srv_fill_msg_open_rsp(struct ibnbd_msg_open_rsp *rsp,
+ u32 device_id, u32 clt_device_id,
+ size_t nsectors,
+ const struct ibnbd_dev *ibnbd_dev)
+{
+ struct block_device *bdev;
+
+ ibnbd_srv_fill_msg_open_rsp_header(rsp, clt_device_id);
+
+ rsp->result = 0;
+ rsp->device_id = device_id;
+ rsp->nsectors = nsectors;
+ rsp->logical_block_size =
+ ibnbd_dev_get_logical_bsize(ibnbd_dev);
+ rsp->physical_block_size = ibnbd_dev_get_phys_bsize(ibnbd_dev);
+ rsp->max_segments = ibnbd_dev_get_max_segs(ibnbd_dev);
+ rsp->max_hw_sectors = ibnbd_dev_get_max_hw_sects(ibnbd_dev);
+ rsp->max_write_same_sectors =
+ ibnbd_dev_get_max_write_same_sects(ibnbd_dev);
+
+ rsp->max_discard_sectors =
+ ibnbd_dev_get_max_discard_sects(ibnbd_dev);
+ rsp->discard_zeroes_data =
+ ibnbd_dev_get_discard_zeroes_data(ibnbd_dev);
+ rsp->discard_granularity =
+ ibnbd_dev_get_discard_granularity(ibnbd_dev);
+
+ rsp->discard_alignment = ibnbd_dev_get_discard_alignment(ibnbd_dev);
+ rsp->secure_discard = ibnbd_dev_get_secure_discard(ibnbd_dev);
+
+ bdev = ibnbd_dev_get_bdev(ibnbd_dev);
+ rsp->rotational = !blk_queue_nonrot(bdev_get_queue(bdev));
+ rsp->io_mode = ibnbd_dev->mode;
+
+ DEB("nsectors = %llu, logical_block_size = %d, "
+ "physical_block_size = %d, max_segments = %d, "
+ "max_hw_sectors = %d, max_write_same_sects = %d, "
+ "max_discard_sectors = %d, rotational = %d, io_mode = %d\n",
+ rsp->nsectors, rsp->logical_block_size, rsp->physical_block_size,
+ rsp->max_segments, rsp->max_hw_sectors, rsp->max_write_same_sectors,
+ rsp->max_discard_sectors, rsp->rotational, rsp->io_mode);
+}
+
+static struct ibnbd_srv_sess_dev *
+ibnbd_srv_create_set_sess_dev(struct ibnbd_srv_session *srv_sess,
+ const struct ibnbd_msg_open *open_msg,
+ struct ibnbd_dev *ibnbd_dev, fmode_t open_flags,
+ struct ibnbd_srv_dev *srv_dev)
+{
+ struct ibnbd_srv_sess_dev *sdev = ibnbd_sess_dev_alloc(srv_sess);
+
+ if (IS_ERR(sdev))
+ return sdev;
+
+ kref_init(&sdev->kref);
+
+ strlcpy(sdev->pathname, open_msg->dev_name, sizeof(sdev->pathname));
+
+ sdev->ibnbd_dev = ibnbd_dev;
+ sdev->sess = srv_sess;
+ sdev->dev = srv_dev;
+ sdev->open_flags = open_flags;
+ sdev->clt_device_id = open_msg->clt_device_id;
+
+ return sdev;
+}
+
+static char *ibnbd_srv_get_full_path(const char *dev_name)
+{
+ char *full_path;
+ char *a, *b;
+
+ full_path = kmalloc(PATH_MAX, GFP_KERNEL);
+ if (!full_path)
+ return ERR_PTR(-ENOMEM);
+
+ 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 void process_msg_sess_info(struct ibtrs_session *s,
+ struct ibnbd_srv_session *srv_sess,
+ const void *msg, size_t len)
+{
+ int err;
+ const struct ibnbd_msg_sess_info *sess_info_msg = msg;
+ struct ibnbd_msg_sess_info_rsp rsp;
+ struct kvec vec = {
+ .iov_base = &rsp,
+ .iov_len = sizeof(rsp)
+ };
+
+ if (srv_sess->hostname[0] == '\0')
+ strlcpy(srv_sess->hostname, ibtrs_srv_get_sess_hostname(s),
+ sizeof(srv_sess->hostname));
+
+ srv_sess->ver = min_t(u8, sess_info_msg->ver, IBNBD_VERSION);
+ DEB("Session to %s (%s) using protocol version %d (client version: %d,"
+ " server version: %d)\n", srv_sess->str_addr, srv_sess->hostname,
+ srv_sess->ver, sess_info_msg->ver, IBNBD_VERSION);
+
+ rsp.hdr.type = IBNBD_MSG_SESS_INFO_RSP;
+ rsp.ver = srv_sess->ver;
+
+ err = ibtrs_srv_send(s, &vec, 1);
+ if (unlikely(err))
+ ERR_NP("Failed to send session info response to client"
+ "%s (%s)\n", srv_sess->str_addr, srv_sess->hostname);
+}
+
+static void process_msg_open(struct ibtrs_session *s,
+ struct ibnbd_srv_session *srv_sess,
+ const void *msg, size_t len)
+{
+ int ret;
+ struct ibnbd_srv_dev *srv_dev;
+ struct ibnbd_srv_sess_dev *srv_sess_dev;
+ const struct ibnbd_msg_open *open_msg = msg;
+ fmode_t open_flags;
+ char *full_path;
+ struct ibnbd_dev *ibnbd_dev;
+ enum ibnbd_io_mode io_mode;
+ struct ibnbd_msg_open_rsp rsp;
+ struct kvec vec = {
+ .iov_base = &rsp,
+ .iov_len = sizeof(rsp)
+ };
+
+ DEB("Open message received: client='%s' path='%s' access_mode=%d"
+ " io_mode=%d\n", srv_sess->str_addr, open_msg->dev_name,
+ open_msg->access_mode, open_msg->io_mode);
+ open_flags = FMODE_READ;
+ if (open_msg->access_mode != IBNBD_ACCESS_RO)
+ open_flags |= FMODE_WRITE;
+
+ if ((strlen(dev_search_path) + strlen(open_msg->dev_name))
+ >= PATH_MAX) {
+ ERR_NP("Opening device for client %s failed, device path too"
+ " long. '%s/%s' is longer than PATH_MAX (%d)\n",
+ srv_sess->str_addr, dev_search_path, open_msg->dev_name,
+ PATH_MAX);
+ ret = -EINVAL;
+ goto reject;
+ }
+ full_path = ibnbd_srv_get_full_path(open_msg->dev_name);
+ if (IS_ERR(full_path)) {
+ ret = PTR_ERR(full_path);
+ ERR_NP("Opening device '%s' for client %s failed,"
+ " failed to get device full path, errno: %d\n",
+ open_msg->dev_name, srv_sess->str_addr, ret);
+ goto reject;
+ }
+
+ if (open_msg->io_mode == IBNBD_BLOCKIO)
+ io_mode = IBNBD_BLOCKIO;
+ else if (open_msg->io_mode == IBNBD_FILEIO)
+ io_mode = IBNBD_FILEIO;
+ else
+ io_mode = def_io_mode;
+
+ ibnbd_dev = ibnbd_dev_open(full_path, open_flags, io_mode,
+ srv_sess->sess_bio_set, ibnbd_endio);
+ if (IS_ERR(ibnbd_dev)) {
+ ERR_NP("Opening device '%s' for client %s failed,"
+ " failed to open the block device, errno:"
+ " %ld\n", full_path, srv_sess->str_addr,
+ PTR_ERR(ibnbd_dev));
+ ret = PTR_ERR(ibnbd_dev);
+ goto free_path;
+ }
+
+ srv_dev = ibnbd_srv_get_or_create_srv_dev(ibnbd_dev, srv_sess, io_mode,
+ open_msg->access_mode);
+ if (IS_ERR(srv_dev)) {
+ ERR_NP("Opening device '%s' for client %s failed,"
+ " creating srv_dev failed, errno: %ld\n", full_path,
+ srv_sess->str_addr, PTR_ERR(srv_dev));
+ ret = PTR_ERR(srv_dev);
+ goto ibnbd_dev_close;
+ }
+
+ srv_sess_dev = ibnbd_srv_create_set_sess_dev(srv_sess, open_msg,
+ ibnbd_dev, open_flags,
+ srv_dev);
+ if (IS_ERR(srv_sess_dev)) {
+ ERR_NP("Opening device '%s' for client %s failed,"
+ " creating sess_dev failed, errno: %ld\n", full_path,
+ srv_sess->str_addr, 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 = ibnbd_srv_create_dev_sysfs(srv_dev,
+ ibnbd_dev_get_bdev(ibnbd_dev),
+ ibnbd_dev_get_name(ibnbd_dev));
+ if (ret) {
+ mutex_unlock(&srv_dev->lock);
+ ERR(srv_sess_dev, "Opening device failed, failed to"
+ " create device sysfs files, errno: %d\n", ret);
+ goto free_srv_sess_dev;
+ }
+ }
+
+ ret = ibnbd_srv_create_dev_client_sysfs(srv_sess_dev);
+ if (ret) {
+ mutex_unlock(&srv_dev->lock);
+ ERR(srv_sess_dev, "Opening device failed, failed to create"
+ " dev client sysfs files, errno: %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);
+
+ mutex_lock(&srv_sess->lock);
+ list_add(&srv_sess_dev->sess_list, &srv_sess->sess_dev_list);
+ mutex_unlock(&srv_sess->lock);
+
+ srv_sess_dev->nsectors = ibnbd_dev_get_capacity(ibnbd_dev);
+
+ ibnbd_srv_fill_msg_open_rsp(&rsp, srv_sess_dev->device_id,
+ open_msg->clt_device_id,
+ srv_sess_dev->nsectors, ibnbd_dev);
+
+ if (unlikely(srv_sess->state == SESS_STATE_DISCONNECTED)) {
+ ret = -ENODEV;
+ ERR(srv_sess_dev, "Opening device failed, session"
+ " is disconnected, errno: %d\n", ret);
+ goto remove_srv_sess_dev;
+ }
+
+ ret = ibtrs_srv_send(s, &vec, 1);
+ if (unlikely(ret)) {
+ ERR(srv_sess_dev, "Opening device failed, sending open"
+ " response msg failed, errno: %d\n", ret);
+ goto remove_srv_sess_dev;
+ }
+ srv_sess_dev->is_visible = true;
+ INFO(srv_sess_dev, "Opened device '%s' in %s mode\n",
+ srv_dev->id, ibnbd_io_mode_str(io_mode));
+
+ kfree(full_path);
+ return;
+
+remove_srv_sess_dev:
+ ibnbd_srv_destroy_dev_client_sysfs(srv_sess_dev);
+ mutex_lock(&srv_sess->lock);
+ list_del(&srv_sess_dev->sess_list);
+ mutex_unlock(&srv_sess->lock);
+
+ mutex_lock(&srv_dev->lock);
+ list_del(&srv_sess_dev->dev_list);
+ mutex_unlock(&srv_dev->lock);
+free_srv_sess_dev:
+ write_lock(&srv_sess->index_lock);
+ idr_remove(&srv_sess->index_idr, srv_sess_dev->device_id);
+ write_unlock(&srv_sess->index_lock);
+ kfree(srv_sess_dev);
+srv_dev_put:
+ if (open_msg->access_mode != IBNBD_ACCESS_RO) {
+ mutex_lock(&srv_dev->lock);
+ srv_dev->open_write_cnt--;
+ mutex_unlock(&srv_dev->lock);
+ }
+ ibnbd_put_srv_dev(srv_dev);
+ibnbd_dev_close:
+ ibnbd_dev_close(ibnbd_dev);
+free_path:
+ kfree(full_path);
+reject:
+ DEB("Sending negative response to client %s for device '%s': %d\n",
+ srv_sess->str_addr, open_msg->dev_name, ret);
+ ibnbd_srv_fill_msg_open_rsp_header(&rsp, open_msg->clt_device_id);
+ rsp.result = ret;
+ if (unlikely(srv_sess->state == SESS_STATE_DISCONNECTED))
+ return;
+ ret = ibtrs_srv_send(s, &vec, 1);
+ if (ret)
+ ERR_NP("Rejecting mapping request of device '%s' from client %s"
+ " failed, errno: %d\n", open_msg->dev_name,
+ srv_sess->str_addr, ret);
+}
+
+static int send_msg_close_rsp(struct ibtrs_session *sess, u32 clt_device_id)
+{
+ struct ibnbd_msg_close_rsp msg;
+ struct kvec vec = {
+ .iov_base = &msg,
+ .iov_len = sizeof(msg)
+ };
+
+ msg.hdr.type = IBNBD_MSG_CLOSE_RSP;
+ msg.clt_device_id = clt_device_id;
+
+ return ibtrs_srv_send(sess, &vec, 1);
+}
+
+static void process_msg_close(struct ibtrs_session *s,
+ struct ibnbd_srv_session *srv_sess,
+ const void *msg, size_t len)
+{
+ const struct ibnbd_msg_close *close_msg = msg;
+ struct ibnbd_srv_sess_dev *sess_dev;
+ u32 dev_id;
+
+ dev_id = close_msg->device_id;
+
+ sess_dev = ibnbd_get_sess_dev(dev_id, srv_sess);
+ if (likely(!IS_ERR(sess_dev))) {
+ u32 clt_device_id = sess_dev->clt_device_id;
+
+ ibnbd_srv_destroy_dev_client_sysfs(sess_dev);
+ ibnbd_put_sess_dev(sess_dev);
+ ibnbd_destroy_sess_dev(sess_dev, false);
+ send_msg_close_rsp(s, clt_device_id);
+ } else {
+ ERR_NP("Destroying device id %d from client %s failed,"
+ " device not open\n", dev_id, srv_sess->str_addr);
+ }
+}
+
+static void ibnbd_srv_recv(struct ibtrs_session *sess, void *priv,
+ const void *msg, size_t len)
+{
+ struct ibnbd_msg_hdr *hdr;
+ struct ibnbd_srv_session *srv_sess;
+
+ hdr = (struct ibnbd_msg_hdr *)msg;
+ srv_sess = priv;
+
+ if (unlikely(WARN_ON(!srv_sess)))
+ return;
+ if (unlikely(WARN_ON(!hdr) || ibnbd_validate_message(msg, len)))
+ return;
+
+ print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 8, 1, msg, len, true);
+
+ switch (hdr->type) {
+ case IBNBD_MSG_SESS_INFO:
+ process_msg_sess_info(sess, srv_sess, msg, len);
+ break;
+ case IBNBD_MSG_OPEN:
+ process_msg_open(sess, srv_sess, msg, len);
+ break;
+ case IBNBD_MSG_CLOSE:
+ process_msg_close(sess, srv_sess, msg, len);
+ break;
+ default:
+ WRN_NP("Message with unexpected type %d received from client"
+ " %s\n", hdr->type, srv_sess->str_addr);
+ break;
+ }
+}
+
+static int ibnbd_srv_revalidate_sess_dev(struct ibnbd_srv_sess_dev *sess_dev)
+{
+ int ret;
+ size_t nsectors;
+ struct ibnbd_msg_revalidate msg;
+ struct kvec vec = {
+ .iov_base = &msg,
+ .iov_len = sizeof(msg)
+ };
+
+ nsectors = ibnbd_dev_get_capacity(sess_dev->ibnbd_dev);
+
+ msg.hdr.type = IBNBD_MSG_REVAL;
+ msg.clt_device_id = sess_dev->clt_device_id;
+ msg.nsectors = nsectors;
+
+ if (unlikely(sess_dev->sess->state == SESS_STATE_DISCONNECTED))
+ return -ENODEV;
+
+ if (!sess_dev->is_visible) {
+ INFO(sess_dev, "revalidate device failed, wait for sending "
+ "open reply first\n");
+ return -EAGAIN;
+ }
+
+ ret = ibtrs_srv_send(sess_dev->sess->ibtrs_sess, &vec, 1);
+ if (unlikely(ret)) {
+ ERR(sess_dev, "revalidate: Sending new device size"
+ " to client failed, errno: %d\n", ret);
+ } else {
+ INFO(sess_dev, "notified client about device size change"
+ " (old nsectors: %lu, new nsectors: %lu)\n",
+ sess_dev->nsectors, nsectors);
+ sess_dev->nsectors = nsectors;
+ }
+
+ return ret;
+}
+
+int ibnbd_srv_revalidate_dev(struct ibnbd_srv_dev *dev)
+{
+ struct ibnbd_srv_sess_dev *sess_dev;
+ int ret = 0;
+
+ mutex_lock(&dev->lock);
+ list_for_each_entry(sess_dev, &dev->sess_dev_list, dev_list)
+ ret += ibnbd_srv_revalidate_sess_dev(sess_dev);
+ mutex_unlock(&dev->lock);
+
+ if (ret)
+ return -EIO;
+
+ return 0;
+}
+
+static int __init ibnbd_srv_init_module(void)
+{
+ int err;
+
+ INFO_NP("Loading module ibnbd_server, version: %s (dev_search_path: "
+ "'%s', def_io_mode: '%s')\n", __stringify(IBNBD_VER),
+ dev_search_path, ibnbd_io_mode_str(def_io_mode));
+
+ ibnbd_srv_ops.owner = THIS_MODULE;
+ ibnbd_srv_ops.recv = ibnbd_srv_recv;
+ ibnbd_srv_ops.rdma_ev = ibnbd_srv_rdma_ev;
+ ibnbd_srv_ops.sess_ev = ibnbd_srv_sess_ev;
+
+ err = ibtrs_srv_register(&ibnbd_srv_ops);
+ if (err) {
+ ERR_NP("Failed to load module, IBTRS registration failed,"
+ " errno: %d\n", err);
+ goto out;
+ }
+
+ err = ibnbd_dev_init();
+ if (err) {
+ ERR_NP("Failed to load module, init device resources failed,"
+ " errno: %d\n", err);
+ goto unreg;
+ }
+
+ err = ibnbd_srv_create_sysfs_files();
+ if (err) {
+ ERR_NP("Failed to load module, create sysfs files failed,"
+ " errno: %d\n", err);
+ goto dev_destroy;
+ }
+
+ return 0;
+
+dev_destroy:
+ ibnbd_dev_destroy();
+unreg:
+ ibtrs_srv_unregister(&ibnbd_srv_ops);
+out:
+ return err;
+}
+
+static void __exit ibnbd_srv_cleanup_module(void)
+{
+ INFO_NP("Unloading module\n");
+ ibtrs_srv_unregister(&ibnbd_srv_ops);
+ WARN_ON(!list_empty(&sess_list));
+ ibnbd_srv_destroy_sysfs_files();
+ ibnbd_dev_destroy();
+ INFO_NP("Module unloaded\n");
+}
+
+module_init(ibnbd_srv_init_module);
+module_exit(ibnbd_srv_cleanup_module);
--
2.7.4
