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authorMax Reitz <mreitz@redhat.com>2017-10-26 09:59:47 +0200
committerKevin Wolf <kwolf@redhat.com>2017-10-26 14:59:18 +0200
commit67e56472a503f94a3950bad85a57fb99706cf1d8 (patch)
tree5b4b797ca2276d9d2e5295f2fdefb9d259002a5c /qemu-img.texi
parentf0a9c18f9e72ab66d3c57c5c3a43137deb534076 (diff)
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qemu-img.1: Image invalidation on qemu-img commit
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>
Diffstat (limited to 'qemu-img.texi')
-rw-r--r--qemu-img.texi9
1 files changed, 4 insertions, 5 deletions
diff --git a/qemu-img.texi b/qemu-img.texi
index ee5c594..fdcf120 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -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}