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104 lines
4.4 KiB
Text
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From: Suresh Jayaraman <sjayaraman-l3A5Bk7waGM@public.gmane.org>
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Subject: [RFC][PATCH 00/10] cifs: local caching support using FS-Cache
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Date: Tue, 22 Jun 2010 20:50:05 +0530
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Lines: 66
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Message-ID: <1277220005-3322-1-git-send-email-sjayaraman@suse.de>
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References: <yes>
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Cc: linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
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linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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To: Steve French <smfrench-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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X-From: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Tue Jun 22 17:40:38 2010
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Return-path: <linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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Envelope-to: glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org
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Received: from vger.kernel.org ([209.132.180.67])
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by lo.gmane.org with esmtp (Exim 4.69)
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(envelope-from <linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>)
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id 1OR5aY-00055O-BD
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for glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org; Tue, 22 Jun 2010 17:40:38 +0200
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Received: (majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org) by vger.kernel.org via listexpand
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id S1751889Ab0FVPkf (ORCPT <rfc822;glkc-linux-cifs@m.gmane.org>);
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Tue, 22 Jun 2010 11:40:35 -0400
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Received: from victor.provo.novell.com ([137.65.250.26]:50040 "EHLO
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victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
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with ESMTP id S1751554Ab0FVPkf (ORCPT
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<rfc822;groupwise-SJayaraman-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org:0:0>);
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Tue, 22 Jun 2010 11:40:35 -0400
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Received: from localhost (prv-ext-foundry1int.gns.novell.com [137.65.251.240])
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by victor.provo.novell.com with ESMTP; Tue, 22 Jun 2010 09:20:07 -0600
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X-Mailer: git-send-email 1.6.4.2
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In-Reply-To: <yes>
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Sender: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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Precedence: bulk
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List-ID: <linux-cifs.vger.kernel.org>
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X-Mailing-List: linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1001756>
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This patchset is a first stab at adding persistent, local caching facility for
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CIFS using the FS-Cache interface.
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The index hierarchy which is mainly used to locate a file object or discard
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a certain subset of the files cached, currently has three levels:
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- Server
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- Share
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- File
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The server index object is keyed by hostname of the server. The superblock
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index object is keyed by the sharename and the inode object is keyed by the
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UniqueId. The cache coherency is ensured by checking the 'LastWriteTime' and
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size of file.
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To use this, apply this patchset in order, mount the share with rsize=4096 and
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try copying a huge file (say few hundred MBs) from mount point to local
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filesystem. During the first time, the cache will be initialized. When you copy
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the second time, it should read from the local cache.
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To reduce the impact of page cache and see the local caching in action
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readily, try doing a sync and drop the caches by doing:
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sync; echo 3 > /proc/sys/vm/drop_caches
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Known issues
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-------------
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- the cache coherency check may not be reliable always as some
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CIFS servers are known not to update mtime until the filehandle is
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closed.
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- not all the Servers under all circumstances provide a unique
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'UniqueId'.
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Todo's
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-------
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- improvements to avoid potential key collisions
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- address the above known issues
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This set is lightly tested and all the bugs seen during my testing have been
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fixed. However, this can be considered as an RFC for now.
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Any Comments or Suggestions are welcome.
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Suresh Jayaraman (10)
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cifs: add kernel config option for CIFS Client caching support
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cifs: guard cifsglob.h against multiple inclusion
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cifs: register CIFS for caching
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cifs: define server-level cache index objects and register them with FS-Cache
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cifs: define superblock-level cache index objects and register them
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cifs: define inode-level cache object and register them
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cifs: FS-Cache page management
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cifs: store pages into local cache
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cifs: read pages from FS-Cache
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cifs: add mount option to enable local caching
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Kconfig | 9 ++
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Makefile | 2
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cache.c | 251 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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cifs_fs_sb.h | 1
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cifsfs.c | 15 +++
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cifsglob.h | 14 +++
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connect.c | 16 +++
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file.c | 51 +++++++++++
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fscache.c | 244 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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fscache.h | 135 +++++++++++++++++++++++++++++++
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inode.c | 4
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11 files changed, 742 insertions(+)
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