Reiser4, the successor to the popular Reiserfs by Hans Reiser, has been in development for a number of years now and, for almost as long, Reiser has been pushing for inclusion of the filesystem in mainline — that is, to make it into the official kernel release. While reiserfs has been part of the kernel since 2.4.1, Reiser4 remains a feature offered only in third party kernel patchsets.
While still in development, the core inhibitors for Reiser4’s inclusion have possibly been more political than technical. Reiser is a passionate and outspoken developer who has, at times, rubbed some of the most respected kernel developers the wrong way. Still, he has listened to criticism and slowly but surely Reiser4 has been prepared to merge into mainline, thanks to reviews of the code and feedback by kernel developers.
So it was with interest that rumours recently spread on news and mailing lists that, finally, an inclusion of Reiser4 into mainline was imminent in the upcoming 2.6.19 or 2.6.20 kernels.
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