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
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avl	Add script for builtin module building.	2012-07-26 13:45:09 -07:00
nvpair	Illumos #2619 and #2747	2013-01-08 10:35:35 -08:00
unicode	Add script for builtin module building.	2012-07-26 13:45:09 -07:00
zcommon	Illumos #3035 LZ4 compression support in ZFS and GRUB	2013-01-29 09:28:20 -08:00
zfs	Remove the bio_empty_barrier() check.	2013-02-24 10:22:34 -08:00
zpios	call_usermodehelper() should wait for process	2013-01-09 16:54:52 -08:00
.gitignore	Add .gitignore files to exclude build products	2010-01-08 11:35:17 -08:00
Makefile.in	Add script for builtin module building.	2012-07-26 13:45:09 -07:00