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Hai Zhang f592aa85c9 Rewrite AtomicDirectory.

The previous version didn't close its FDs for directories, and called
fsync() on the wrong FDs. To make sure a rename() is persisted, we
need to call fsync() on the FD of the parent directory, because file
names are stored in directory entries instead of inodes.

Also removed the need for dedicated native code by calling the Os
class directly.

Fixes: 139302541
Bug: 138866253
Test: presubmit
Change-Id: I67fe98811814acba5158d760766a2ef3b121225a

2019-08-12 23:49:07 +00:00