Kazunori INOUE comments

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                                            Kazunori INOUE

storage_mon: Use the O_DIRECT flag in open() to eliminate cache effects

- https://github.com/ClusterLabs/resource-agents/pull/1797/commits/ce4e632f29ed6b86b82a959eac5844655baed153 - According to https://ci.kronosnet.org/job/resource-agents-build-all-voting/1530/, build targets are FreeBSD and RHEL etc., so I deleted ```#if defined(__linux__) || defined(__FreeBSD__)```. - Fixed FreeBSD build failure. - The open() manual says...

storage_mon: Use the O_DIRECT flag in open() to eliminate cache effects

- https://github.com/ClusterLabs/resource-agents/pull/1797/commits/7a0aaa0dfdebeab3fae9fe9ddc412c3d1f610273 - reflected the https://github.com/ClusterLabs/resource-agents/pull/1797#pullrequestreview-1080084034.

storage-mon: storage_mon updates attribute, waits for child to finish

If an I/O unresponsive failure occurs with the following settings: ``` pcs property set node-health-strategy=only-green pcs resource create storage-mon ocf:heartbeat:storage-mon drives="/dev/mapper/mpathc" pcs resource clone storage-mon storage-mon-clone pcs resource meta storage-mon-clone...

storage-mon: storage_mon updates attribute, waits for child to finish

> Things I was thinking of would be to return (with a negative monitor result or not) before a timeout but keeping > the process ids of still running processes...