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qemu-img.1: Image invalidation on qemu-img commit

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qemu-img commit invalidates all images between base and top.  This
should be mentioned in the man page.

Suggested-by: Ping Li <pingl@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2017-10-26 09:59:47 +02:00 committed by Kevin Wolf
parent f0a9c18f9e
commit 67e56472a5
1 changed files with 4 additions and 5 deletions
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9
qemu-img.texi
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@ -274,11 +274,10 @@ If the backing chain of the given image file @var{filename} has more than one
layer, the backing file into which the changes will be committed may be
specified as @var{base} (which has to be part of @var{filename}'s backing
chain). If @var{base} is not specified, the immediate backing file of the top
image (which is @var{filename}) will be used. For reasons of consistency,
explicitly specifying @var{base} will always imply @code{-d} (since emptying an
image after committing to an indirect backing file would lead to different data
being read from the image due to content in the intermediate backing chain
overruling the commit target).
image (which is @var{filename}) will be used. Note that after a commit operation
all images between @var{base} and the top image will be invalid and may return
garbage data when read. For this reason, @code{-b} implies @code{-d} (so that
the top image stays valid).
@item compare [-f @var{fmt}] [-F @var{fmt}] [-T @var{src_cache}] [-p] [-s] [-q] @var{filename1} @var{filename2}