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Chunwei Chen 704cd0758a Enable lazytime semantic for atime 
Linux 4.0 introduces lazytime. The idea is that when we update the atime, we
delay writing it to disk for as long as it is reasonably possible.

When lazytime is enabled, dirty_inode will be called with only I_DIRTY_TIME
flag whenever i_atime is updated. So under such condition, we will set
z_atime_dirty. We will only write it to disk if file is closed, inode is
evicted or setattr is called. Ideally, we should also write it whenever SA
is going to be updated, but it is left for future improvement.

There's one thing that we should take care of now that we allow i_atime to be
dirty. In original implementation, whenever SA is modified, zfs_inode_update
will be called to overwrite every thing in inode. This will cause dirty
i_atime to be discarded. We fix this by don't overwrite i_atime in
zfs_inode_update. We only overwrite i_atime when allocating new inode or doing
zfs_rezget with zfs_inode_update_new.

Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4482
2016-04-05 18:55:51 -07:00
cmd Add support for devid and phys_path keys in vdev disk labels 2016-03-31 13:45:53 -07:00
config Fix WANT_DEVNAME2DEVID configure error 2016-04-01 09:06:54 -07:00
contrib Activate LVM volume groups before looking for zpools. 2015-12-18 13:46:23 -08:00
etc Add support for alpine linux 2016-03-08 13:19:53 -08:00
include Fix atime handling and relatime 2016-04-05 18:54:55 -07:00
lib Add support for devid and phys_path keys in vdev disk labels 2016-03-31 13:45:53 -07:00
man Add support for devid and phys_path keys in vdev disk labels 2016-03-31 13:45:53 -07:00
module Enable lazytime semantic for atime 2016-04-05 18:55:51 -07:00
rpm Add the ZFS Test Suite 2016-03-16 13:46:16 -07:00
scripts Fix zpool_scrub_* test cases 2016-03-30 09:30:34 -07:00
tests Only build devname2devid when libudev headers are available 2016-03-31 14:54:47 -07:00
udev Support parallel build trees (VPATH builds) 2015-07-17 13:42:51 -07:00
.gitignore Ignore *.{deb,rpm,tar.gz} files in the top directory. 2013-04-24 16:18:59 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add a missing > to AUTHORS 2014-09-02 14:18:53 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac Add the ZFS Test Suite 2016-03-16 13:46:16 -07:00
copy-builtin Fix --enable-linux-builtin 2015-12-02 07:54:32 -08:00
COPYRIGHT Update ZED copyright boilerplate 2015-05-11 15:07:00 -07:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Add the ZFS Test Suite 2016-03-16 13:46:16 -07:00
META Tag zfs-0.6.5 2015-09-11 11:16:38 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
TEST Add the ZFS Test Suite 2016-03-16 13:46:16 -07:00
zfs-script-config.sh.in Add zloop.sh test script 2016-03-23 16:12:25 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

Native ZFS for Linux!

ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org