Bug #3765: rbd cp of a zero sized image succeeds with error - rbd - Ceph

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Bug #3765

closed

rbd cp of a zero sized image succeeds with error

Added by Tamilarasi muthamizhan over 11 years ago. Updated over 11 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Dan Mick

Target version:

% Done:

Source:

Q/A

Tags:

Backport:

Regression:

Severity:

Reviewed:

Affected Versions:

ceph-qa-suite:

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Crash signature (v2):

Description

ceph version 0.56-131-gd283abd (d283abdf50b1e4429b775680bfae1bb20c75306b)

while am still surprised about why we need a rbd image of size zero, it allows me to copy the image but throws an inappropriate message "rbd: copy failed: (22) Invalid argument".

Please find below the CLI screenshot,

ubuntu@burnupi24:/var/log/ceph$ rbd create tam --size 0
ubuntu@burnupi24:/var/log/ceph$ rbd ls
tam

ubuntu@burnupi24:/var/log/ceph$ rbd cp tam tamm
Image copy: 100% complete...done.
rbd: copy failed: (22) Invalid argument

ubuntu@burnupi24:/var/log/ceph$ rbd ls
tam
tamm

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Updated by Dan Mick over 11 years ago

I looked into this; it happens because clip_io() (called from read_iterate()) tries to validate
that writing at offset 0 is not beyond the image size of 0. Doh. I suppose we could
special-case "len == 0".

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