> > From: Miklos Szeredi <[email protected]>
> >
> > Allow the userspace filesystem to supply a blksize value to be
> > returned by stat() and friends. If the field is zero, it defaults to
> > the old PAGE_CACHE_SIZE value.
> >
>
> Why does fuse need this feature?
There are cases, when the filesystem will be passed the buffer from a
single read or write call, namely:
1) in 'direct-io' mode (not O_DIRECT), read/write requests don't go
through the page cache, but go directly to the userspace fs
2) currently buffered writes are done with single page requests, but
if Nick's ->perform_write() patch goes it, it will be possible to
do larger write requests. But only if the original write() was
also bigger than a page.
In these cases the filesystem might want to give a hint to the app
about the optimal I/O size.
Miklos
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