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qemu-img: Saner printing of large file sizes

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Disk sizes close to INT64_MAX cause overflow, for some pretty
ridiculous output:

  $ ./nbdkit -U - memory size=$((2**63 - 512)) --run 'qemu-img info $nbd'
  image: nbd+unix://?socket=/tmp/nbdkitHSAzNz/socket
  file format: raw
  virtual size: -8388607T (9223372036854775296 bytes)
  disk size: unavailable

But there's no reason to have two separate implementations of integer
to human-readable abbreviation, where one has overflow and stops at
'T', while the other avoids overflow and goes all the way to 'E'. With
this patch, the output now claims 8EiB instead of -8388607T, which
really is the correct rounding of largest file size supported by qemu
(we could go 511 bytes larger if we used byte-accurate sizing instead
of rounding up to the next sector boundary, but that wouldn't change
the human-readable result).

Quite a few iotests need updates to expected output to match.

Reported-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Tested-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Eric Blake 2019-04-17 12:11:01 -05:00 • committed by Kevin Wolf
parent 754da86714
commit de38b5005e
29 changed files with 123 additions and 150 deletions
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8
tests/qemu-iotests/210.out
View file

@ -14,7 +14,7 @@
image: json:{"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_IMG"}, "key-secret": "keysec0"}
file format: IMGFMT
virtual size: 128M (134217728 bytes)
virtual size: 128 MiB (134217728 bytes)
encrypted: yes
Format specific information:
ivgen alg: plain64
@ -66,7 +66,7 @@ Format specific information:
image: json:{"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_IMG"}, "key-secret": "keysec0"}
file format: IMGFMT
virtual size: 64M (67108864 bytes)
virtual size: 64 MiB (67108864 bytes)
encrypted: yes
Format specific information:
ivgen alg: plain64
@ -121,7 +121,7 @@ Job failed: Cannot find device=this doesn't exist nor node_name=this doesn't exi
image: json:{"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_IMG"}, "key-secret": "keysec0"}
file format: IMGFMT
virtual size: 0 (0 bytes)
virtual size: 0 B (0 bytes)
encrypted: yes
Format specific information:
ivgen alg: plain64
@ -191,7 +191,7 @@ Job failed: The requested file size is too large
{"error": {"class": "GenericError", "desc": "Parameter 'size' expects a >0 size"}}
image: json:{"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_IMG"}, "key-secret": "keysec0"}
file format: IMGFMT
virtual size: 0 (0 bytes)
virtual size: 0 B (0 bytes)
encrypted: yes
Format specific information:
ivgen alg: plain64