diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-rnbd-client')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-rnbd-client | 93 |
1 files changed, 51 insertions, 42 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-rnbd-client b/Documentation/ABI/testing/sysfs-class-rnbd-client index c084f203b41e..00c0286733d4 100644 --- a/Documentation/ABI/testing/sysfs-class-rnbd-client +++ b/Documentation/ABI/testing/sysfs-class-rnbd-client @@ -5,62 +5,70 @@ Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud Description: Provide information about RNBD-client. All sysfs files that are not read-only provide the usage information on read: - Example: - # cat /sys/class/rnbd-client/ctl/map_device + Example:: - > Usage: echo "sessname=<name of the rtrs session> path=<[srcaddr,]dstaddr> - > [path=<[srcaddr,]dstaddr>] device_path=<full path on remote side> - > [access_mode=<ro|rw|migration>] > map_device - > - > addr ::= [ ip:<ipv4> | ip:<ipv6> | gid:<gid> ] + # cat /sys/class/rnbd-client/ctl/map_device + + > Usage: echo "sessname=<name of the rtrs session> path=<[srcaddr,]dstaddr> + > [path=<[srcaddr,]dstaddr>] device_path=<full path on remote side> + > [access_mode=<ro|rw|migration>] > map_device + > + > addr ::= [ ip:<ipv4> | ip:<ipv6> | gid:<gid> ] What: /sys/class/rnbd-client/ctl/map_device Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> -Description: Expected format is the following: +Description: Expected format is the following:: - sessname=<name of the rtrs session> - path=<[srcaddr,]dstaddr> [path=<[srcaddr,]dstaddr> ...] - device_path=<full path on remote side> - [access_mode=<ro|rw|migration>] + sessname=<name of the rtrs session> + path=<[srcaddr,]dstaddr> [path=<[srcaddr,]dstaddr> ...] + device_path=<full path on remote side> + [access_mode=<ro|rw|migration>] Where: - sessname: accepts a string not bigger than 256 chars, which identifies - a given session on the client and on the server. - I.e. "clt_hostname-srv_hostname" could be a natural choice. + sessname: + accepts a string not bigger than 256 chars, which identifies + a given session on the client and on the server. + I.e. "clt_hostname-srv_hostname" could be a natural choice. + + path: + describes a connection between the client and the server by + specifying destination and, when required, the source address. + The addresses are to be provided in the following format:: - path: describes a connection between the client and the server by - specifying destination and, when required, the source address. - The addresses are to be provided in the following format: + ip:<IPv6> + ip:<IPv4> + gid:<GID> - ip:<IPv6> - ip:<IPv4> - gid:<GID> + for example:: - for example: + path=ip:10.0.0.66 - path=ip:10.0.0.66 The single addr is treated as the destination. The connection will be established to this server from any client IP address. - path=ip:10.0.0.66,ip:10.0.1.66 + :: + + path=ip:10.0.0.66,ip:10.0.1.66 + First addr is the source address and the second is the destination. If multiple "path=" options are specified multiple connection will be established and data will be sent according to the selected multipath policy (see RTRS mp_policy sysfs entry description). - device_path: Path to the block device on the server side. Path is specified - relative to the directory on server side configured in the - 'dev_search_path' module parameter of the rnbd_server. - The rnbd_server prepends the <device_path> received from client - with <dev_search_path> and tries to open the - <dev_search_path>/<device_path> block device. On success, - a /dev/rnbd<N> device file, a /sys/block/rnbd_client/rnbd<N>/ - directory and an entry in /sys/class/rnbd-client/ctl/devices - will be created. + device_path: + Path to the block device on the server side. Path is specified + relative to the directory on server side configured in the + 'dev_search_path' module parameter of the rnbd_server. + The rnbd_server prepends the <device_path> received from client + with <dev_search_path> and tries to open the + <dev_search_path>/<device_path> block device. On success, + a /dev/rnbd<N> device file, a /sys/block/rnbd_client/rnbd<N>/ + directory and an entry in /sys/class/rnbd-client/ctl/devices + will be created. If 'dev_search_path' contains '%SESSNAME%', then each session can have different devices namespace, e.g. server was configured with @@ -68,11 +76,12 @@ Description: Expected format is the following: client has this string "sessname=blya device_path=sda", then server will try to open: /run/rnbd-devs/blya/sda. - access_mode: the access_mode parameter specifies if the device is to be - mapped as "ro" read-only or "rw" read-write. The server allows - a device to be exported in rw mode only once. The "migration" - access mode has to be specified if a second mapping in read-write - mode is desired. + access_mode: + the access_mode parameter specifies if the device is to be + mapped as "ro" read-only or "rw" read-write. The server allows + a device to be exported in rw mode only once. The "migration" + access mode has to be specified if a second mapping in read-write + mode is desired. By default "rw" is used. @@ -91,7 +100,7 @@ Description: Expected format is the following: is the same as the device name. By extracting the last part of the path the path to the device /dev/<dev-name> can be build. - o /dev/block/$(cat /sys/class/rnbd-client/ctl/devices/<device_id>/dev) + * /dev/block/$(cat /sys/class/rnbd-client/ctl/devices/<device_id>/dev) How to find the <device_id> of the device is described on the next section. @@ -106,6 +115,6 @@ Description: For each device mapped on the client a new symbolic link is created The <device_id> of each device is created as follows: - If the 'device_path' provided during mapping contains slashes ("/"), - they are replaced by exclamation mark ("!") and used as as the - <device_id>. Otherwise, the <device_id> will be the same as the - "device_path" provided. + they are replaced by exclamation mark ("!") and used as as the + <device_id>. Otherwise, the <device_id> will be the same as the + "device_path" provided. |