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Etienne Dechamps
d9b0ebbe82
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
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