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Message-ID: <47444807.9050803@lougher.demon.co.uk> Date: Wed, 21 Nov 2007 15:00:23 +0000 From: Phillip Lougher <phillip@...gher.demon.co.uk> To: Christoph Hellwig <hch@...radead.org> CC: Dave Jones <davej@...hat.com>, maximilian attems <max@...o.at>, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: [ANN] Squashfs 3.3 released Christoph Hellwig wrote: > On Wed, Nov 21, 2007 at 02:02:43PM +0000, Phillip Lougher wrote: >> Unfortunately the move to fixed little endian filesystem will involve >> another filesystem layout change. The current filesystem layout still >> uses packed bitfield structures, and it is impossible to swap these >> using the standard kernel swap macros. Removal of my routines that can >> properly swap packed bitfield structures is another change demanded by >> the Linux kernel mailing list. > > The normal way to do it is to use shift and mask after doing the endian > conversion. But the problem with bitfields is that they can have different > kinds of layouts depending on the compiler or abi which is another reason > to avoid them in ondisk/wire formats. > Yes, the bitfields are packed differently on little and big endian architectures which mean they appear in different places in the structure. I want to move away from that mess when I move to little endian only. Phillip - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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