RBD image name constraints

["Bartłomiej Święcki" <bartlomiej.swiecki@corp.ovh.com>]

Hi,

What are constraints regarding names of RBD images? I tried to look it 
up but without success.

My tests show that maximum length is about 4089 bytes and the only 
forbidden characters are '\0' and '@' but didn't get deep enough into 
the code to figure out the length limit. Are my findings correct?

I also think I've found a regression introduced in v10.0.1 regarding 
pool / image name constraints (introduced in 
fa4e00f8c85603ed202bfef2f3be6086482fbbb2).

In newer versions there's regex that's parsing image name passed to rbd 
command (in src/tools/rbd/Utils.cc, function: extract_spec):

     "^(?:([^/@]+)/)?([^/@]+)(?:@([^/@]+))?$"

It won't parse pool name with '@', image name with '/' nor snapshot name 
with '/', which was allowed in previous implementation based on strchr.

Kind regards
Bartłomiej Święcki
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