Documentation/ABI/testing/sysfs-block-rnbd
Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-block-rnbd
File Facts
- System
- Linux kernel
- Corpus path
Documentation/ABI/testing/sysfs-block-rnbd- Extension
[no extension]- Size
- 2773 bytes
- Lines
- 65
- Domain
- Support Tooling And Documentation
- Bucket
- Documentation
- Inferred role
- Support Tooling And Documentation: Documentation
- Status
- atlas-only
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
What: /sys/block/rnbd<N>/rnbd/unmap_device
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: To unmap a volume, "normal" or "force" has to be written to:
/sys/block/rnbd<N>/rnbd/unmap_device
When "normal" is used, the operation will fail with EBUSY if any process
is using the device. When "force" is used, the device is also unmapped
when device is in use. All I/Os that are in progress will fail.
Example::
# echo "normal" > /sys/block/rnbd0/rnbd/unmap_device
What: /sys/block/rnbd<N>/rnbd/state
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: The file contains the current state of the block device. The state file
returns "open" when the device is successfully mapped from the server
and accepting I/O requests. When the connection to the server gets
disconnected in case of an error (e.g. link failure), the state file
returns "closed" and all I/O requests submitted to it will fail with -EIO.
What: /sys/block/rnbd<N>/rnbd/session
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: RNBD uses RTRS session to transport the data between client and
server. The entry "session" contains the name of the session, that
was used to establish the RTRS session. It's the same name that
was passed as server parameter to the map_device entry.
What: /sys/block/rnbd<N>/rnbd/mapping_path
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: Contains the path that was passed as "device_path" to the map_device
operation.
What: /sys/block/rnbd<N>/rnbd/access_mode
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: Contains the device access mode: ro, rw or migration.
What: /sys/block/rnbd<N>/rnbd/resize
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: Write the number of sectors to change the size of the disk.
What: /sys/block/rnbd<N>/rnbd/remap_device
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: Remap the disconnected device if the session is not destroyed yet.
What: /sys/block/rnbd<N>/rnbd/nr_poll_queues
Date: Feb 2020
KernelVersion: 5.7
Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
Description: Contains the number of poll-mode queues
Annotation
- Atlas domain: Support Tooling And Documentation / Documentation.
- Implementation status: atlas-only.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.