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block/rnbd-clt: support mapping two devices with the same name from different servers
Previously, we can't map same device name from different sessions due to the limitation of sysfs naming mechanism. root@clt2:~# ls -l /sys/class/rnbd-client/ctl/devices/ total 0 lrwxrwxrwx 1 root 0 Sep 2 16:31 !dev!nullb1 -> ../../../block/rnbd0 We only use the device name in above, which caused device with the same name can't be mapped from another server. To address the issue, the sessname is appended to the node to differentiate where the device comes from. Also, we need to check if the pathname is existed in a specific session instead of search it in global sess_list. Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com> Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com> Reviewed-by: Md Haris Iqbal <haris.iqbal@cloud.ionos.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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parent
ce9fe18abb
commit
91f4acb280
2 changed files with 12 additions and 5 deletions
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@ -480,6 +480,10 @@ static int rnbd_clt_get_path_name(struct rnbd_clt_dev *dev, char *buf,
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if (ret >= len)
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return -ENAMETOOLONG;
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ret = snprintf(buf, len, "%s@%s", buf, dev->sess->sessname);
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if (ret >= len)
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return -ENAMETOOLONG;
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return 0;
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}
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@ -1410,13 +1410,16 @@ static struct rnbd_clt_dev *init_dev(struct rnbd_clt_session *sess,
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return ERR_PTR(ret);
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}
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static bool __exists_dev(const char *pathname)
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static bool __exists_dev(const char *pathname, const char *sessname)
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{
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struct rnbd_clt_session *sess;
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struct rnbd_clt_dev *dev;
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bool found = false;
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list_for_each_entry(sess, &sess_list, list) {
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if (sessname && strncmp(sess->sessname, sessname,
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sizeof(sess->sessname)))
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continue;
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mutex_lock(&sess->lock);
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list_for_each_entry(dev, &sess->devs_list, list) {
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if (!strncmp(dev->pathname, pathname,
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@ -1433,12 +1436,12 @@ static bool __exists_dev(const char *pathname)
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return found;
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}
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static bool exists_devpath(const char *pathname)
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static bool exists_devpath(const char *pathname, const char *sessname)
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{
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bool found;
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mutex_lock(&sess_lock);
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found = __exists_dev(pathname);
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found = __exists_dev(pathname, sessname);
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mutex_unlock(&sess_lock);
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return found;
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@ -1451,7 +1454,7 @@ static bool insert_dev_if_not_exists_devpath(const char *pathname,
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bool found;
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mutex_lock(&sess_lock);
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found = __exists_dev(pathname);
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found = __exists_dev(pathname, sess->sessname);
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if (!found) {
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mutex_lock(&sess->lock);
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list_add_tail(&dev->list, &sess->devs_list);
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@ -1481,7 +1484,7 @@ struct rnbd_clt_dev *rnbd_clt_map_device(const char *sessname,
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struct rnbd_clt_dev *dev;
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int ret;
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if (exists_devpath(pathname))
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if (unlikely(exists_devpath(pathname, sessname)))
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return ERR_PTR(-EEXIST);
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sess = find_and_get_or_create_sess(sessname, paths, path_cnt, port_nr);
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