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[linux.git] / Documentation / ABI / testing / sysfs-block-rnbd
1 What:           /sys/block/rnbd<N>/rnbd/unmap_device
2 Date:           Feb 2020
3 KernelVersion:  5.7
4 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
5 Description:    To unmap a volume, "normal" or "force" has to be written to:
6                 /sys/block/rnbd<N>/rnbd/unmap_device
7
8                 When "normal" is used, the operation will fail with EBUSY if any process
9                 is using the device.  When "force" is used, the device is also unmapped
10                 when device is in use.  All I/Os that are in progress will fail.
11
12                 Example::
13
14                   # echo "normal" > /sys/block/rnbd0/rnbd/unmap_device
15
16 What:           /sys/block/rnbd<N>/rnbd/state
17 Date:           Feb 2020
18 KernelVersion:  5.7
19 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
20 Description:    The file contains the current state of the block device. The state file
21                 returns "open" when the device is successfully mapped from the server
22                 and accepting I/O requests. When the connection to the server gets
23                 disconnected in case of an error (e.g. link failure), the state file
24                 returns "closed" and all I/O requests submitted to it will fail with -EIO.
25
26 What:           /sys/block/rnbd<N>/rnbd/session
27 Date:           Feb 2020
28 KernelVersion:  5.7
29 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
30 Description:    RNBD uses RTRS session to transport the data between client and
31                 server.  The entry "session" contains the name of the session, that
32                 was used to establish the RTRS session.  It's the same name that
33                 was passed as server parameter to the map_device entry.
34
35 What:           /sys/block/rnbd<N>/rnbd/mapping_path
36 Date:           Feb 2020
37 KernelVersion:  5.7
38 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
39 Description:    Contains the path that was passed as "device_path" to the map_device
40                 operation.
41
42 What:           /sys/block/rnbd<N>/rnbd/access_mode
43 Date:           Feb 2020
44 KernelVersion:  5.7
45 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
46 Description:    Contains the device access mode: ro, rw or migration.
47
48 What:           /sys/block/rnbd<N>/rnbd/resize
49 Date:           Feb 2020
50 KernelVersion:  5.7
51 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
52 Description:    Write the number of sectors to change the size of the disk.
53
54 What:           /sys/block/rnbd<N>/rnbd/remap_device
55 Date:           Feb 2020
56 KernelVersion:  5.7
57 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
58 Description:    Remap the disconnected device if the session is not destroyed yet.
59
60 What:           /sys/block/rnbd<N>/rnbd/nr_poll_queues
61 Date:           Feb 2020
62 KernelVersion:  5.7
63 Contact:        Jack Wang <[email protected]> Danil Kipnis <[email protected]>
64 Description:    Contains the number of poll-mode queues
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