On Sat, Jun 23, 2007 at 11:07:54PM -0400, Jeff Garzik wrote:

quoted

- In line with the above item, filesystem block allocation is performed
 before a page is dirtied. In the buffer layer, mmap writes can dirty a
 page with no backing blocks which is a problem if the filesystem is
 ENOSPC (patches exist for buffer.c for this).

This raises an eyebrow...  The handling of ENOSPC prior to mmap write is 
more an ABI behavior, so I don't see how this can be fixed with internal 
changes, yet without changing behavior currently exported to userland 
(and thus affecting code based on such assumptions).

Not really, the current behaviour is a bug.  And it's not actually buffer
layer specific - XFS now has a fix for that bug and it's generic enough
that everyone could use it.

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