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Kir Kolyshkin
0228226e6d
Move the functionality of opening a cgroup file into a separate function, OpenFile, which, similar to ReadFile and WriteFile, use separate dir and file arguments. Change ReadFile and WriteFile to rely on OpenFile, and use lower-level read and write instead of ones from ioutil. It changes the semantics of WriteFile a bit -- it no longer uses O_CREAT flag. This is good for real cgroup as there is no need to try creating the files in there, but can potentially break WriteFile users -- previously, EPERM error was returned for non-existing files, and now it's ENOENT. This also breaks the fs/fs2 unit tests since they write to pseudo-cgroup files inside a test directory (not to a real cgroup fs), and now fscommon.WriteFile do not create or truncate files, so we have to add a variable that is set by the unit tests. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>