tree 00d84a2406137aab5cc4b8ed290f962608558d70
parent fe032c422c5ba562ba9c2d316f55e258e03259c6
author Theodore Ts'o <tytso@mit.edu> 1422855422 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1423122300 -0500

ext4: add optimization for the lazytime mount option

Add an optimization for the MS_LAZYTIME mount option so that we will
opportunistically write out any inodes with the I_DIRTY_TIME flag set
in a particular inode table block when we need to update some inode in
that inode table block anyway.

Also add some temporary code so that we can set the lazytime mount
option without needing a modified /sbin/mount program which can set
MS_LAZYTIME.  We can eventually make this go away once util-linux has
added support.

Google-Bug-Id: 18297052

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>