tree 59c44acad8dfb0b1bd5281f11dfbdd85eb15255f
parent 981222f500baffae98bfd5949de41257a8238074
author Zim <zezeozue@google.com> 1569510365 +0100
committer Zim <zezeozue@google.com> 1569510696 +0100

Lazily write inode timestamps to FUSE

Before this, the FUSE daemon receives a setattr inode timestamp
request for every write request. This can be crippling for write
performance or read performance during writes especially random
writes where the write back cache does not effectively coagulate
requests.

We now add the MS_LAZYTIME mount flag
(http://man7.org/linux/man-pages/man2/mount.2.html) to lazily flush
the timestamp updates from memory to disk

Test: m
Bug: 135341433
Change-Id: I95a467d5682a325b4099f32634d93ed2921f815e