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Etienne Dechamps d9b0ebbe82 Remove the bio_empty_barrier() check. 
To determine whether the kernel is capable of handling empty barrier
BIOs, we check for the presence of the bio_empty_barrier() macro,
which was introduced in 2.6.24. If this macro is defined, then we can
flush disk vdevs; if it isn't, then flushing is disabled.

Unfortunately, the bio_empty_barrier() macro was removed in 2.6.37,
even though the kernel is still capable of handling empty barrier BIOs.

As a result, flushing is effectively disabled on kernels >= 2.6.37,
meaning that starting from this kernel version, zfs doesn't use
barriers to guarantee on-disk data consistency. This is quite bad and
can lead to potential data corruption on power failures.

This patch fixes the issue by removing the configure check for
bio_empty_barrier(), as we don't support kernels <= 2.6.24 anymore.

Thanks to Richard Kojedzinszky for catching this nasty bug.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1318
2013-02-24 10:22:34 -08:00
cmd Honor 80 character limit in 'zpool status' 2013-01-31 11:06:57 -08:00
config Remove the bio_empty_barrier() check. 2013-02-24 10:22:34 -08:00
dracut Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
etc Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
include Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
lib Remove unused machelf.h header 2013-02-05 15:34:50 -08:00
man Update the zfs.8 "ZFS Volumes as Swap" section 2013-02-07 14:19:40 -08:00
module Remove the bio_empty_barrier() check. 2013-02-24 10:22:34 -08:00
patches Adding grub2 mkconfig support patch 2012-07-30 16:17:23 -07:00
scripts Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
udev Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
.gitignore Remove autotools products 2012-09-11 10:15:13 -07:00
AUTHORS Refresh AUTHORS 2012-12-19 09:47:25 -08:00
autogen.sh Remove autotools products 2012-08-27 11:47:44 -07:00
configure.ac Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
copy-builtin Consistent menuconfig name 2012-08-26 13:49:37 -07:00
COPYING Relocate COPYING+COPYRIGHT, remove README cruft 2008-12-01 15:34:53 -08:00
COPYRIGHT Update COPYRIGHT to reference zpios CDDL exceptions. 2010-05-18 14:25:28 -07:00
DISCLAIMER Update COPYRIGHT and DISCLAIMER. 2010-05-18 10:32:23 -07:00
dkms.conf.in Support building a zfs-modules-dkms sub package 2012-08-08 15:21:01 -07:00
dkms.postinst Support building a zfs-modules-dkms sub package 2012-08-08 15:21:01 -07:00
Makefile.am Do not use KERNEL_DIR env var in Makefile.am 2012-12-17 09:45:47 -08:00
META ZFS 0.6.0-rc14 2013-02-01 11:26:55 -08:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
PKGBUILD-zfs-modules.in Add make rule for building Arch Linux packages 2011-12-14 19:14:23 -08:00
PKGBUILD-zfs.in Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
README.markdown Add script for builtin module building. 2012-07-26 13:45:09 -07:00
zfs-modules.spec.in Cleanly remove zfs-modules-devel headers 2012-08-13 16:35:26 -07:00
zfs-script-config.sh.in Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
ZFS.RELEASE Update to onnv_147 2010-08-26 14:24:34 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00
zfs.spec.in Fix broken RPATH in spec file 2013-02-12 13:59:09 -08:00

README.markdown

Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!

$ ./configure
$ make pkg

To copy the kernel code inside your kernel source tree for builtin compilation:

$ ./configure --enable-linux-builtin --with-linux=/usr/src/linux-...
$ ./copy-builtin /usr/src/linux-...

Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org