Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / ceph / cache.h

diff --git a/kernel/fs/ceph/cache.h b/kernel/fs/ceph/cache.h
new file mode 100644 (file)
index 0000000..5ac591b
--- /dev/null
+++ b/kernel/fs/ceph/cache.h
@@ -0,0 +1,182 @@
+/*
+ * Ceph cache definitions.
+ *
+ *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
+ *  Written by Milosz Tanski (milosz@adfin.com)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#ifndef _CEPH_CACHE_H
+#define _CEPH_CACHE_H
+
+#ifdef CONFIG_CEPH_FSCACHE
+
+extern struct fscache_netfs ceph_cache_netfs;
+
+int ceph_fscache_register(void);
+void ceph_fscache_unregister(void);
+
+int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
+void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
+
+void ceph_fscache_inode_init(struct ceph_inode_info *ci);
+void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
+                                       struct ceph_inode_info* ci);
+void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
+
+int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
+int ceph_readpages_from_fscache(struct inode *inode,
+                               struct address_space *mapping,
+                               struct list_head *pages,
+                               unsigned *nr_pages);
+void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
+void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
+void ceph_queue_revalidate(struct inode *inode);
+
+static inline void ceph_fscache_update_objectsize(struct inode *inode)
+{
+       struct ceph_inode_info *ci = ceph_inode(inode);
+       fscache_attr_changed(ci->fscache);
+}
+
+static inline void ceph_fscache_invalidate(struct inode *inode)
+{
+       fscache_invalidate(ceph_inode(inode)->fscache);
+}
+
+static inline void ceph_fscache_uncache_page(struct inode *inode,
+                                            struct page *page)
+{
+       struct ceph_inode_info *ci = ceph_inode(inode);
+       return fscache_uncache_page(ci->fscache, page);
+}
+
+static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
+{
+       struct inode* inode = page->mapping->host;
+       struct ceph_inode_info *ci = ceph_inode(inode);
+       return fscache_maybe_release_page(ci->fscache, page, gfp);
+}
+
+static inline void ceph_fscache_readpage_cancel(struct inode *inode,
+                                               struct page *page)
+{
+       struct ceph_inode_info *ci = ceph_inode(inode);
+       if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
+               __fscache_uncache_page(ci->fscache, page);
+}
+
+static inline void ceph_fscache_readpages_cancel(struct inode *inode,
+                                                struct list_head *pages)
+{
+       struct ceph_inode_info *ci = ceph_inode(inode);
+       return fscache_readpages_cancel(ci->fscache, pages);
+}
+
+#else
+
+static inline int ceph_fscache_register(void)
+{
+       return 0;
+}
+
+static inline void ceph_fscache_unregister(void)
+{
+}
+
+static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
+{
+       return 0;
+}
+
+static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
+{
+}
+
+static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
+{
+}
+
+static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
+                                                     struct ceph_inode_info* ci)
+{
+}
+
+static inline void ceph_fscache_uncache_page(struct inode *inode,
+                                            struct page *pages)
+{
+}
+
+static inline int ceph_readpage_from_fscache(struct inode* inode,
+                                            struct page *page)
+{
+       return -ENOBUFS;
+}
+
+static inline int ceph_readpages_from_fscache(struct inode *inode,
+                                             struct address_space *mapping,
+                                             struct list_head *pages,
+                                             unsigned *nr_pages)
+{
+       return -ENOBUFS;
+}
+
+static inline void ceph_readpage_to_fscache(struct inode *inode,
+                                           struct page *page)
+{
+}
+
+static inline void ceph_fscache_update_objectsize(struct inode *inode)
+{
+}
+
+static inline void ceph_fscache_invalidate(struct inode *inode)
+{
+}
+
+static inline void ceph_invalidate_fscache_page(struct inode *inode,
+                                               struct page *page)
+{
+}
+
+static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
+{
+}
+
+static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
+{
+       return 1;
+}
+
+static inline void ceph_fscache_readpage_cancel(struct inode *inode,
+                                               struct page *page)
+{
+}
+
+static inline void ceph_fscache_readpages_cancel(struct inode *inode,
+                                                struct list_head *pages)
+{
+}
+
+static inline void ceph_queue_revalidate(struct inode *inode)
+{
+}
+
+#endif
+
+#endif