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block/file-posix: add x-check-page-cache=on|off option

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mincore(2) checks whether pages are resident.  Use it to verify that
page cache has been dropped.

You can trigger a verification failure by mmapping the image file from
another process that loads a byte from a page, forcing it to become
resident.  bdrv_co_invalidate_cache() will fail while that process is
alive.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20180427162312.18583-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-04-27 17:23:12 +01:00
parent dd577a26ff
commit 31be8a2a97
2 changed files with 104 additions and 3 deletions
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7
qapi/block-core.json
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@ -2530,6 +2530,10 @@
# @locking: whether to enable file locking. If set to 'auto', only enable
# when Open File Descriptor (OFD) locking API is available
# (default: auto, since 2.10)
# @x-check-cache-dropped: whether to check that page cache was dropped on live
# migration. May cause noticeable delays if the image
# file is large, do not use in production.
# (default: off) (since: 2.13)
#
# Since: 2.9
##
@ -2537,7 +2541,8 @@
'data': { 'filename': 'str',
'*pr-manager': 'str',
'*locking': 'OnOffAuto',
'*aio': 'BlockdevAioOptions' } }
'*aio': 'BlockdevAioOptions',
'*x-check-cache-dropped': 'bool' } }
##
# @BlockdevOptionsNull: