[Bugs] [Bug 1700295] New: The data couldn't be flushed immediately even with O_SYNC in glfs_create or with glfs_fsync/glfs_fdatasync after glfs_write.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1700295

            Bug ID: 1700295
           Summary: The data couldn't be flushed immediately even with
                    O_SYNC in glfs_create or with
                    glfs_fsync/glfs_fdatasync after glfs_write.
           Product: GlusterFS
           Version: 6
            Status: NEW
         Component: core
          Assignee: bugs at gluster.org
          Reporter: xiubli at redhat.com
                CC: bugs at gluster.org
  Target Milestone: ---
    Classification: Community



Description of problem:

In gluster-block project we had hit a case where we will sometimes get old
block metadata with blockGetMetaInfo(), which will glfs_read from the block
file, after updating the block metadata with GB_METAUPDATE_OR_GOTO(), which
will glfs_write the block file.

In GB_METAUPDATE_OR_GOTO, it basically open the metafile with the O_SYNC, write
the new details and close it in-place, which should flush the data to metafile.
But looks like in glusterfs-api-devel-6.0-0.4.rc1.fc29.x86_64 it will not be
flushed in time.

Version-Release number of selected component (if applicable):




How reproducible:
In RHEL 7 by using the gluster-blocl/tests/basic.t script with
glusterfs-api-devel-6.0-0.4.rc1.fc29.x86_64 it is very easy to reproduce, in my
setups almost 40%.

Steps to Reproduce:
1. git clone https://github.com/gluster/gluster-block.git
2. build it from source and install it
3. install the tcmu-runner package or use the upstream code
4. $ ./tests/basic.t



Actual results:
Delete will fail sometimes

Expected results:
Delete should be success

Additional info:

More detail please see
https://github.com/gluster/gluster-block/issues/204
https://github.com/gluster/gluster-block/pull/209

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