On Tue, 12 Sep 2000, Daniel Phillips wrote:
> Alexander Viro wrote:
> >
> > On Tue, 12 Sep 2000, Daniel Phillips wrote:
> >
> > > This is getblk, except for pages. It finds or sets up a page in a
> > > mapping. It puts buffers on the page if necessary but doesn't cause
> > > any I/O action.
> >
> > ... and it is absolutely meaningless for many filesystems. Try to define
> > what it means for NFS, etc.
>
> Could you clarify, please? Does this mean that generic_file_read is
> also meaningless for nfs? (It's used in nfs.)
Erm? generic_file_read() is prefectly happy using ->readpage(). And
frankly, I see no point in "put buffers on page if it's a block-based fs
that uses buffer_heads, but don't map them" as a method. The rest of it
(find/create) is done by grab_cache_page() and is completely independent
from the fs type.
Again, comment stands - you are trying to shoehorn your problem into the
helper functions for different case. block_*_page() stuff is not used by
VFS/VM - they are just a bunch of helper functions that are useful for
many filesystems.
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