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author | Jack Wang <jinpu.wang@cloud.ionos.com> | 2020-05-11 16:51:28 +0300 |
---|---|---|
committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-05-18 00:57:17 +0300 |
commit | 8cee532f469bbcdb6ac0ab161ebff36fbc6439d7 (patch) | |
tree | 9df5159d400c22b8969a623492a7bba18a519888 /drivers/block/rnbd/rnbd-srv-sysfs.c | |
parent | f0aad9baadb5b2933e6f4fbb2fd3ffbdcc35b2cf (diff) | |
download | linux-8cee532f469bbcdb6ac0ab161ebff36fbc6439d7.tar.xz |
block/rnbd: server: sysfs interface functions
This is the sysfs interface to rnbd mapped devices on server side:
/sys/class/rnbd-server/ctl/devices/<device_name>/
|- block_dev
| *** link pointing to the corresponding block device sysfs entry
|
|- sessions/<session-name>/
| *** sessions directory
|
|- read_only
| *** is devices mapped as read only
|
|- mapping_path
*** relative device path provided by the client during mapping
Link: https://lore.kernel.org/r/20200511135131.27580-23-danil.kipnis@cloud.ionos.com
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/block/rnbd/rnbd-srv-sysfs.c')
-rw-r--r-- | drivers/block/rnbd/rnbd-srv-sysfs.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/drivers/block/rnbd/rnbd-srv-sysfs.c b/drivers/block/rnbd/rnbd-srv-sysfs.c new file mode 100644 index 000000000000..106775c074d1 --- /dev/null +++ b/drivers/block/rnbd/rnbd-srv-sysfs.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * RDMA Network Block Driver + * + * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. + * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. + * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. + */ +#undef pr_fmt +#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt + +#include <uapi/linux/limits.h> +#include <linux/kobject.h> +#include <linux/sysfs.h> +#include <linux/stat.h> +#include <linux/genhd.h> +#include <linux/list.h> +#include <linux/moduleparam.h> +#include <linux/device.h> + +#include "rnbd-srv.h" + +static struct device *rnbd_dev; +static struct class *rnbd_dev_class; +static struct kobject *rnbd_devs_kobj; + +static void rnbd_srv_dev_release(struct kobject *kobj) +{ + struct rnbd_srv_dev *dev; + + dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj); + + kfree(dev); +} + +static struct kobj_type dev_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = rnbd_srv_dev_release +}; + +int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev, + struct block_device *bdev, + const char *dev_name) +{ + struct kobject *bdev_kobj; + int ret; + + ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype, + rnbd_devs_kobj, dev_name); + if (ret) + return ret; + + dev->dev_sessions_kobj = kobject_create_and_add("sessions", + &dev->dev_kobj); + if (!dev->dev_sessions_kobj) + goto put_dev_kobj; + + bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj; + ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev"); + if (ret) + goto put_sess_kobj; + + return 0; + +put_sess_kobj: + kobject_put(dev->dev_sessions_kobj); +put_dev_kobj: + kobject_put(&dev->dev_kobj); + return ret; +} + +void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev) +{ + sysfs_remove_link(&dev->dev_kobj, "block_dev"); + kobject_del(dev->dev_sessions_kobj); + kobject_put(dev->dev_sessions_kobj); + kobject_del(&dev->dev_kobj); + kobject_put(&dev->dev_kobj); +} + +static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr, + char *page) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%d\n", + !(sess_dev->open_flags & FMODE_WRITE)); +} + +static struct kobj_attribute rnbd_srv_dev_session_ro_attr = + __ATTR_RO(read_only); + +static ssize_t access_mode_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *page) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%s\n", + rnbd_access_mode_str(sess_dev->access_mode)); +} + +static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr = + __ATTR_RO(access_mode); + +static ssize_t mapping_path_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%s\n", sess_dev->pathname); +} + +static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr = + __ATTR_RO(mapping_path); + +static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = { + &rnbd_srv_dev_session_access_mode_attr.attr, + &rnbd_srv_dev_session_ro_attr.attr, + &rnbd_srv_dev_session_mapping_path_attr.attr, + NULL, +}; + +static struct attribute_group rnbd_srv_default_dev_session_attr_group = { + .attrs = rnbd_srv_default_dev_sessions_attrs, +}; + +void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev) +{ + sysfs_remove_group(&sess_dev->kobj, + &rnbd_srv_default_dev_session_attr_group); + + kobject_del(&sess_dev->kobj); + kobject_put(&sess_dev->kobj); +} + +static void rnbd_srv_sess_dev_release(struct kobject *kobj) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + rnbd_destroy_sess_dev(sess_dev); +} + +static struct kobj_type rnbd_srv_sess_dev_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = rnbd_srv_sess_dev_release, +}; + +int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev) +{ + int ret; + + ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype, + sess_dev->dev->dev_sessions_kobj, "%s", + sess_dev->sess->sessname); + if (ret) + return ret; + + ret = sysfs_create_group(&sess_dev->kobj, + &rnbd_srv_default_dev_session_attr_group); + if (ret) + goto err; + + return 0; + +err: + kobject_put(&sess_dev->kobj); + + return ret; +} + +int rnbd_srv_create_sysfs_files(void) +{ + int err; + + rnbd_dev_class = class_create(THIS_MODULE, "rnbd-server"); + if (IS_ERR(rnbd_dev_class)) + return PTR_ERR(rnbd_dev_class); + + rnbd_dev = device_create(rnbd_dev_class, NULL, + MKDEV(0, 0), NULL, "ctl"); + if (IS_ERR(rnbd_dev)) { + err = PTR_ERR(rnbd_dev); + goto cls_destroy; + } + rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj); + if (!rnbd_devs_kobj) { + err = -ENOMEM; + goto dev_destroy; + } + + return 0; + +dev_destroy: + device_destroy(rnbd_dev_class, MKDEV(0, 0)); +cls_destroy: + class_destroy(rnbd_dev_class); + + return err; +} + +void rnbd_srv_destroy_sysfs_files(void) +{ + kobject_del(rnbd_devs_kobj); + kobject_put(rnbd_devs_kobj); + device_destroy(rnbd_dev_class, MKDEV(0, 0)); + class_destroy(rnbd_dev_class); +} |