Feel free to add whatever occurs to you by finishing the sentence '[VFS] needs ...'

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[tclVFS] needs a 'notifying fs' such that whenever modifications are made to a monitored directory a callback is made. -- [CMcC] 20040905
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[tclVFS] needs to support more of the core vfs functionality, specifically copy and rename.  They are currently lacking, and so tcl's vfs core falls back to open/read/write/close for copy and copy/delete for rename, which are ''far'' slower than they might be.

One difficulty with implementing this is that the tcl core implemented fallback only occurs if the [VFS] signals their lack with a NULL pointer.  It would be cleaner if tcl core exported those fallback routines, and the [tclvfs] could determine whether the optional facilities were supported by a given tclvfs implementation, and fall back otherwise, or if the vfs interface allowed some form of error to indictate the need to fall back.  Perhaps returning a break, or continue, or some other hack.

Upon closer inspection, it appears that some kinds of failure from the vfs copyfile proc will be interpreted as a requirement to fall back, specifically if the tcl core can be made to think that the source and destination filesystems are different.

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'''vfs composition:''' the ability to stack vfs on top of one another, ala [Plan 9].  It's got it, [Cache VFS] - complete with write-back.

A component of this is '''vfs::add'', which gives the ability to compose file systems functionally. -- 20040612 [CMcC]

A more featureful facility is offered by [SEH]'s [A collate/broadcast virtual filesystem]

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'''versioning vfs:''' write to a file, and the diffs are store and accessed by globbing the file as if it were a directory.  People have got to realise that the distinction between file and directory is a purely arbitrary and not particularly useful constraint.

Implementation ideas: use CVS or metakit as a backing store?  I'm tempted to use metakit with progressive diffs.  I guess it ought really to be backend agnostic, but I'm not sure I want to go to the trouble. -- 20040612 [CMcC]

[SEH] Try [a versioning virtual filesystem].
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[[ [Category VFS] | [Category Suggestions] ]]