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Thu, 11 Jan 2007

Filesystem corruption bug recently found in Linux kernel.


LWN.net article about it clearly shows how complex VFS is, but its conclusion and Linus words about buffer heads are interesting. Conclusion is basically 'do not use buffer heads'. Indeed, all the time I worked with VFS ( kevent and AIO, receiving zero-copy, test block device for acrypto) I never ever tried to use buffer heads - why is it needed, when this days we operate with pages already - and eventually filesystems operate with pages too - they have special set of callbacks to write page, read them and so on.
So, filesystem must be simple in that regard - do not split page into buffer heads, always work with pages and provide appropriate callbacks where they are needed (inode operations at least), and that is how my FS will work.

/devel/fs :: Link / Comments ()