tree e20344e3d296d2271eea093c76fa728e1c341510
parent a1d494495c69ef0810cd008f59310d2b9db28e36
author Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1338506771 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1338511767 -0700

nilfs2: flush disk caches in syncing

There are two cases that the cache flush is needed to avoid data loss
against unexpected hang or power failure.  One is sync file function (i.e.
 nilfs_sync_file) and another is checkpointing ioctl.

This issues a cache flush request to device for such cases if barrier
mount option is enabled, and makes sure data really is on persistent
storage on their completion.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>