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904abff4b1
Fix netfslib's read-retry to only call ->prepare_read() in the backing
filesystem such a function is provided. We can get to this point if a
there's an active cache as failed reads from the cache need negotiating
with the server instead.
Fixes: ee4cdf7ba8 ("netfs: Speed up buffered reading")
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/529329.1736261010@warthog.procyon.org.uk
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Linux kernel
============
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