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Date: Tue, 22 Jun 2010 17:52:14 -0400
From: Jeff Layton <jlayton@...chiereds.net>
To: Suresh Jayaraman <sjayaraman@...e.de>
Cc: Steve French <smfrench@...il.com>, linux-cifs@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
David Howells <dhowells@...hat.com>
Subject: Re: [RFC][PATCH 04/10] cifs: define server-level cache index
objects and register them with FS-Cache
On Tue, 22 Jun 2010 20:53:18 +0530
Suresh Jayaraman <sjayaraman@...e.de> wrote:
> Define server-level cache index objects (as managed by TCP_ServerInfo structs).
> Each server object is created in the CIFS top-level index object and is itself
> an index into which superblock-level objects are inserted.
>
> Currently, the server objects are keyed by hostname.
>
> Signed-off-by: Suresh Jayaraman <sjayaraman@...e.de>
> ---
> fs/cifs/Makefile | 2 +-
> fs/cifs/cache.c | 25 +++++++++++++++++++++++++
> fs/cifs/cifsglob.h | 3 +++
> fs/cifs/connect.c | 4 ++++
> fs/cifs/fscache.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
> fs/cifs/fscache.h | 12 ++++++++++++
> 6 files changed, 92 insertions(+), 1 deletion(-)
> create mode 100644 fs/cifs/fscache.c
>
> Index: cifs-2.6/fs/cifs/Makefile
> ===================================================================
> --- cifs-2.6.orig/fs/cifs/Makefile
> +++ cifs-2.6/fs/cifs/Makefile
> @@ -12,4 +12,4 @@ cifs-$(CONFIG_CIFS_UPCALL) += cifs_spneg
>
> cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o
>
> -cifs-$(CONFIG_CIFS_FSCACHE) += cache.o
> +cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
> Index: cifs-2.6/fs/cifs/cache.c
> ===================================================================
> --- cifs-2.6.orig/fs/cifs/cache.c
> +++ cifs-2.6/fs/cifs/cache.c
> @@ -51,3 +51,28 @@ void cifs_fscache_unregister(void)
> fscache_unregister_netfs(&cifs_fscache_netfs);
> }
>
> +/*
> + * Server object currently keyed by hostname
> + */
> +static uint16_t cifs_server_get_key(const void *cookie_netfs_data,
> + void *buffer, uint16_t maxbuf)
> +{
> + const struct TCP_Server_Info *server = cookie_netfs_data;
> + uint16_t len = strnlen(server->hostname, sizeof(server->hostname));
> +
Would a tuple of address/family/port be a better choice here? Imagine I
mount "foo" and then later mount "foor.bar.baz". If they are the same
address and only the UNC differs, then you won't get the benefit of
the cache, right?
> + if (len > maxbuf)
> + return 0;
> +
> + memcpy(buffer, server->hostname, len);
> +
> + return len;
> +}
> +
> +/*
> + * Server object for FS-Cache
> + */
> +const struct fscache_cookie_def cifs_fscache_server_index_def = {
> + .name = "CIFS.server",
> + .type = FSCACHE_COOKIE_TYPE_INDEX,
> + .get_key = cifs_server_get_key,
> +};
> Index: cifs-2.6/fs/cifs/cifsglob.h
> ===================================================================
> --- cifs-2.6.orig/fs/cifs/cifsglob.h
> +++ cifs-2.6/fs/cifs/cifsglob.h
> @@ -193,6 +193,9 @@ struct TCP_Server_Info {
> bool sec_mskerberos; /* supports legacy MS Kerberos */
> bool sec_kerberosu2u; /* supports U2U Kerberos */
> bool sec_ntlmssp; /* supports NTLMSSP */
> +#ifdef CONFIG_CIFS_FSCACHE
> + struct fscache_cookie *fscache; /* client index cache cookie */
> +#endif
> };
>
> /*
> Index: cifs-2.6/fs/cifs/connect.c
> ===================================================================
> --- cifs-2.6.orig/fs/cifs/connect.c
> +++ cifs-2.6/fs/cifs/connect.c
> @@ -48,6 +48,7 @@
> #include "nterr.h"
> #include "rfc1002pdu.h"
> #include "cn_cifs.h"
> +#include "fscache.h"
>
> #define CIFS_PORT 445
> #define RFC1001_PORT 139
> @@ -1453,6 +1454,8 @@ cifs_put_tcp_session(struct TCP_Server_I
> return;
> }
>
> + cifs_fscache_release_client_cookie(server);
> +
> list_del_init(&server->tcp_ses_list);
> write_unlock(&cifs_tcp_ses_lock);
>
> @@ -1572,6 +1575,7 @@ cifs_get_tcp_session(struct smb_vol *vol
> goto out_err;
> }
>
> + cifs_fscache_get_client_cookie(tcp_ses);
> /* thread spawned, put it on the list */
> write_lock(&cifs_tcp_ses_lock);
> list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
> Index: cifs-2.6/fs/cifs/fscache.c
> ===================================================================
> --- /dev/null
> +++ cifs-2.6/fs/cifs/fscache.c
> @@ -0,0 +1,47 @@
> +/*
> + * fs/cifs/fscache.c - CIFS filesystem cache interface
> + *
> + * Copyright (c) 2010 Novell, Inc.
> + * Authors(s): Suresh Jayaraman (sjayaraman@...e.de>
> + *
> + * This library is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU Lesser General Public License as published
> + * by the Free Software Foundation; either version 2.1 of the License, or
> + * (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
> + * the GNU Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public License
> + * along with this library; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + */
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/sched.h>
> +#include <linux/mm.h>
> +#include <linux/in6.h>
> +
> +#include "fscache.h"
> +#include "cifsglob.h"
> +#include "cifs_debug.h"
> +
> +void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
> +{
> + server->fscache =
> + fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
> + &cifs_fscache_server_index_def, server);
> + cFYI(1, "CIFS: get client cookie (0x%p/0x%p)\n",
> + server, server->fscache);
> +}
> +
> +void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
> +{
> + cFYI(1, "CIFS: release client cookie (0x%p/0x%p)\n",
> + server, server->fscache);
> + fscache_relinquish_cookie(server->fscache, 0);
> + server->fscache = NULL;
> +}
> +
> Index: cifs-2.6/fs/cifs/fscache.h
> ===================================================================
> --- cifs-2.6.orig/fs/cifs/fscache.h
> +++ cifs-2.6/fs/cifs/fscache.h
> @@ -27,14 +27,26 @@
> #ifdef CONFIG_CIFS_FSCACHE
>
> extern struct fscache_netfs cifs_fscache_netfs;
> +extern const struct fscache_cookie_def cifs_fscache_server_index_def;
>
> extern int cifs_fscache_register(void);
> extern void cifs_fscache_unregister(void);
>
> +/*
> + * fscache.c
> + */
> +extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
> +extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
> +
> #else /* CONFIG_CIFS_FSCACHE */
> static inline int cifs_fscache_register(void) { return 0; }
> static inline void cifs_fscache_unregister(void) {}
>
> +static inline void
> +cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
> +static inline void
> +cifs_fscache_get_client_cookie(struct TCP_Server_Info *server); {}
> +
> #endif /* CONFIG_CIFS_FSCACHE */
>
> #endif /* _CIFS_FSCACHE_H */
> --
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--
Jeff Layton <jlayton@...chiereds.net>
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