From: Sage Weil <sage@newdream.net>
Date: Tue, 6 Oct 2009 18:31:08 +0000 (-0700)
Subject: ceph: file operations
X-Git-Tag: v2.6.34-rc2~9^2~197
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=124e68e74099090e28da5518f73fda878e7e8232;p=pandora-kernel.git

ceph: file operations

File open and close operations, and read and write methods that ensure
we have obtained the proper capabilities from the MDS cluster before
performing IO on a file.  We take references on held capabilities for
the duration of the read/write to avoid prematurely releasing them
back to the MDS.

We implement two main paths for read and write: one that is buffered
(and uses generic_aio_{read,write}), and one that is fully synchronous
and blocking (operating either on a __user pointer or, if O_DIRECT,
directly on user pages).

Signed-off-by: Sage Weil <sage@newdream.net>
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