> The attached patch adds a new VMA operation to notify a filesystem or other
> driver about the MMU generating a fault because userspace attempted to write
> to a page mapped through a read-only PTE.
>
> This facility permits the filesystem or driver to:
>
> (*) Implement storage allocation/reservation on attempted write, and so to
> deal with problems such as ENOSPC more gracefully (perhaps by generating
> SIGBUS).
>
> (*) Delay making the page writable until the contents have been written to a
> backing cache. This is useful for NFS/AFS when using FS-Cache/CacheFS.
> It permits the filesystem to have some guarantee about the state of the
> cache.
(*) account and limit number of dirty pages
This is one piece of the puzze needed to make shared writable mapping
work safely in FUSE.
> Updated to 2.6.14-git14.
But doesn't apply against 2.6.15-rc3 or -rc3-mm1.
Miklos
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