--- /dev/null
+From: Suresh Jayaraman <sjayaraman-l3A5Bk7waGM@public.gmane.org>
+Subject: [RFC][PATCH 05/10] cifs: define superblock-level cache index objects and register them
+Date: Tue, 22 Jun 2010 20:53:26 +0530
+Lines: 177
+Message-ID: <1277220206-3559-1-git-send-email-sjayaraman@suse.de>
+References: <yes>
+Cc: linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
+ linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
+To: Steve French <smfrench-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+X-From: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Tue Jun 22 17:45:50 2010
+Return-path: <linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
+Envelope-to: glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org
+Received: from vger.kernel.org ([209.132.180.67])
+ by lo.gmane.org with esmtp (Exim 4.69)
+ (envelope-from <linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>)
+ id 1OR5fZ-0000Vj-Mj
+ for glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org; Tue, 22 Jun 2010 17:45:50 +0200
+Received: (majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org) by vger.kernel.org via listexpand
+ id S1752511Ab0FVPpJ (ORCPT <rfc822;glkc-linux-cifs@m.gmane.org>);
+ Tue, 22 Jun 2010 11:45:09 -0400
+Received: from victor.provo.novell.com ([137.65.250.26]:56189 "EHLO
+ victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
+ with ESMTP id S1752441Ab0FVPoA (ORCPT
+ <rfc822;groupwise-SJayaraman-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org:0:0>);
+ Tue, 22 Jun 2010 11:44:00 -0400
+Received: from localhost (prv-ext-foundry1int.gns.novell.com [137.65.251.240])
+ by victor.provo.novell.com with ESMTP; Tue, 22 Jun 2010 09:23:29 -0600
+X-Mailer: git-send-email 1.6.4.2
+In-Reply-To: <yes>
+Sender: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
+Precedence: bulk
+List-ID: <linux-cifs.vger.kernel.org>
+X-Mailing-List: linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
+Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1001766>
+
+Define superblock-level cache index objects (managed by cifsTconInfo structs).
+Each superblock object is created in a server-level index object and in itself
+an index into which inode-level objects are inserted.
+
+Currently, the superblock objects are keyed by sharename.
+
+Signed-off-by: Suresh Jayaraman <sjayaraman-l3A5Bk7waGM@public.gmane.org>
+---
+ fs/cifs/cache.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++
+ fs/cifs/cifsglob.h | 3 ++
+ fs/cifs/connect.c | 4 +++
+ fs/cifs/fscache.c | 17 ++++++++++++++
+ fs/cifs/fscache.h | 6 +++++
+ 5 files changed, 92 insertions(+)
+
+Index: cifs-2.6/fs/cifs/cache.c
+===================================================================
+--- cifs-2.6.orig/fs/cifs/cache.c
++++ cifs-2.6/fs/cifs/cache.c
+@@ -76,3 +76,65 @@ const struct fscache_cookie_def cifs_fsc
+ .type = FSCACHE_COOKIE_TYPE_INDEX,
+ .get_key = cifs_server_get_key,
+ };
++
++static char *extract_sharename(const char *treename)
++{
++ const char *src;
++ char *delim, *dst;
++ int len;
++
++ /* skip double chars at the beginning */
++ src = treename + 2;
++
++ /* share name is always preceded by '\\' now */
++ delim = strchr(src, '\\');
++ if (!delim)
++ return ERR_PTR(-EINVAL);
++ delim++;
++ len = strlen(delim);
++
++ /* caller has to free the memory */
++ dst = kstrndup(delim, len, GFP_KERNEL);
++ if (!dst)
++ return ERR_PTR(-ENOMEM);
++
++ return dst;
++}
++
++/*
++ * Superblock object currently keyed by share name
++ */
++static uint16_t cifs_super_get_key(const void *cookie_netfs_data, void *buffer,
++ uint16_t maxbuf)
++{
++ const struct cifsTconInfo *tcon = cookie_netfs_data;
++ char *sharename;
++ uint16_t len;
++
++ sharename = extract_sharename(tcon->treeName);
++ if (IS_ERR(sharename)) {
++ cFYI(1, "CIFS: couldn't extract sharename\n");
++ sharename = NULL;
++ return 0;
++ }
++
++ len = strlen(sharename);
++ if (len > maxbuf)
++ return 0;
++
++ memcpy(buffer, sharename, len);
++
++ kfree(sharename);
++
++ return len;
++}
++
++/*
++ * Superblock object for FS-Cache
++ */
++const struct fscache_cookie_def cifs_fscache_super_index_def = {
++ .name = "CIFS.super",
++ .type = FSCACHE_COOKIE_TYPE_INDEX,
++ .get_key = cifs_super_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
+@@ -317,6 +317,9 @@ struct cifsTconInfo {
+ bool local_lease:1; /* check leases (only) on local system not remote */
+ bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
+ bool need_reconnect:1; /* connection reset, tid now invalid */
++#ifdef CONFIG_CIFS_FSCACHE
++ struct fscache_cookie *fscache; /* cookie for share */
++#endif
+ /* BB add field for back pointer to sb struct(s)? */
+ };
+
+Index: cifs-2.6/fs/cifs/connect.c
+===================================================================
+--- cifs-2.6.orig/fs/cifs/connect.c
++++ cifs-2.6/fs/cifs/connect.c
+@@ -1773,6 +1773,8 @@ cifs_put_tcon(struct cifsTconInfo *tcon)
+ list_del_init(&tcon->tcon_list);
+ write_unlock(&cifs_tcp_ses_lock);
+
++ cifs_fscache_release_super_cookie(tcon);
++
+ xid = GetXid();
+ CIFSSMBTDis(xid, tcon);
+ _FreeXid(xid);
+@@ -1843,6 +1845,8 @@ cifs_get_tcon(struct cifsSesInfo *ses, s
+ tcon->nocase = volume_info->nocase;
+ tcon->local_lease = volume_info->local_lease;
+
++ cifs_fscache_get_super_cookie(tcon);
++
+ write_lock(&cifs_tcp_ses_lock);
+ list_add(&tcon->tcon_list, &ses->tcon_list);
+ write_unlock(&cifs_tcp_ses_lock);
+Index: cifs-2.6/fs/cifs/fscache.c
+===================================================================
+--- cifs-2.6.orig/fs/cifs/fscache.c
++++ cifs-2.6/fs/cifs/fscache.c
+@@ -45,3 +45,20 @@ void cifs_fscache_release_client_cookie(
+ server->fscache = NULL;
+ }
+
++void cifs_fscache_get_super_cookie(struct cifsTconInfo *tcon)
++{
++ tcon->fscache =
++ fscache_acquire_cookie(tcon->ses->server->fscache,
++ &cifs_fscache_super_index_def, tcon);
++ cFYI(1, "CIFS: get superblock cookie (0x%p/0x%p)\n",
++ tcon, tcon->fscache);
++}
++
++void cifs_fscache_release_super_cookie(struct cifsTconInfo *tcon)
++{
++ cFYI(1, "CIFS: releasing superblock cookie (0x%p/0x%p)\n",
++ tcon, tcon->fscache);
++ fscache_relinquish_cookie(tcon->fscache, 0);
++ tcon->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
+@@ -28,6 +28,7 @@
+
+ extern struct fscache_netfs cifs_fscache_netfs;
+ extern const struct fscache_cookie_def cifs_fscache_server_index_def;
++extern const struct fscache_cookie_def cifs_fscache_super_index_def;
+
+ extern int cifs_fscache_register(void);
+ extern void cifs_fscache_unregister(void);
+@@ -37,6 +38,8 @@ extern void cifs_fscache_unregister(void
+ */
+ extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
+ extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
++extern void cifs_fscache_get_super_cookie(struct cifsTconInfo *);
++extern void cifs_fscache_release_super_cookie(struct cifsTconInfo *);
+
+ #else /* CONFIG_CIFS_FSCACHE */
+ static inline int cifs_fscache_register(void) { return 0; }
+@@ -46,6 +49,9 @@ 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); {}
++static inline void cifs_fscache_get_super_cookie(struct cifsTconInfo *tcon) {}
++static inline void
++cifs_fscache_release_super_cookie(struct cifsTconInfo *tcon) {}
+
+ #endif /* CONFIG_CIFS_FSCACHE */
+
+
+
projects / notmuch / blobdiff