Feature #18335: rbd-nbd: check /sys/block/nbdX/size to ensure kernel mapped correctly - rbd - Ceph

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Feature #18335

closed

rbd-nbd: check /sys/block/nbdX/size to ensure kernel mapped correctly

Added by Jason Dillaman over 7 years ago. Updated almost 7 years ago.

Status:

Resolved

Priority:

Low

Assignee:

Mykola Golub

Target version:

% Done:

Source:

Tags:

Backport:

kraken,jewel

Reviewed:

Affected Versions:

Pull request ID:

Description

There are bugs with some kernel versions that result in large image sizes resulting in an overflow:

# rbd info large
rbd image 'large':
size 3072 GB in 786432 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.103774b0dc51
format: 2
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
flags:

# rbd nbd map large # patched to allow large images
/dev/nbd0

# blockdev --getsize64 /dev/nbd0
18446742974197923840  # 16777215 TB!

# blockdev --getpbsz /dev/nbd0
512

# blockdev --getsz /dev/nbd0
36028794871480320 # nope!

After mapping the image, verify that the kernel agrees with the image size. Know to not work properly on Fedora 24.

Related issues 2 (0 open — 2 closed)