J. Bruce Fields wrote:
> > J. Bruce Fields wrote:
> > > So, I'm still confused: there must be some case where we know fscache
> > > actually works reliably and doesn't corrupt your data, right?
> >
> > Using ext2/3, for example. I don't know under what circumstances xfs, ext4
> > and btrfs mig
On Thu, Jan 21, 2021 at 08:08:24PM +, David Howells wrote:
> J. Bruce Fields wrote:
> > So, I'm still confused: there must be some case where we know fscache
> > actually works reliably and doesn't corrupt your data, right?
>
> Using ext2/3, for example. I don't know under what circumstances
On Thu, Jan 21, 2021 at 06:55:13PM +, David Howells wrote:
> > Is it that those "bridging" blocks only show up in certain corner cases
> > that users can arrange to avoid? Or that it's OK as long as you use
> > certain specific file systems whose behavior goes beyond what's
> > technically req
J. Bruce Fields wrote:
> > J. Bruce Fields wrote:
> >
> > > > Fixing this requires a much bigger overhaul of cachefiles than this
> > > > patchset
> > > > performs.
> > >
> > > That sounds like "sometimes you may get file corruption and there's
> > > nothing you can do about it". But I know
J. Bruce Fields wrote:
> > Fixing this requires a much bigger overhaul of cachefiles than this patchset
> > performs.
>
> That sounds like "sometimes you may get file corruption and there's
> nothing you can do about it". But I know people actually use fscache,
> so it must be reliable at least
On Thu, Jan 21, 2021 at 06:55:13PM +, David Howells wrote:
> J. Bruce Fields wrote:
>
> > > Fixing this requires a much bigger overhaul of cachefiles than this
> > > patchset
> > > performs.
> >
> > That sounds like "sometimes you may get file corruption and there's
> > nothing you can do a
On Thu, Jan 21, 2021 at 05:02:57PM +, David Howells wrote:
> J. Bruce Fields wrote:
>
> > On Wed, Jan 20, 2021 at 10:21:24PM +, David Howells wrote:
> > > Note that this uses SEEK_HOLE/SEEK_DATA to locate the data available
> > > to be read from the cache. Whilst this is an imp
J. Bruce Fields wrote:
> On Wed, Jan 20, 2021 at 10:21:24PM +, David Howells wrote:
> > Note that this uses SEEK_HOLE/SEEK_DATA to locate the data available
> > to be read from the cache. Whilst this is an improvement from the
> > bmap interface, it still has a problem with re
On Wed, Jan 20, 2021 at 10:21:24PM +, David Howells wrote:
> Note that this uses SEEK_HOLE/SEEK_DATA to locate the data available
> to be read from the cache. Whilst this is an improvement from the
> bmap interface, it still has a problem with regard to a modern
> extent-ba
Here's a set of patches to do two things:
(1) Add a helper library to handle the new VM readahead interface. This
is intended to be used unconditionally by the filesystem (whether or
not caching is enabled) and provides a common framework for doing
caching, transparent huge page
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