--- /dev/null
+From: Suresh Jayaraman <sjayaraman@suse.de>
+Subject: [RFC][PATCH 07/10] cifs: FS-Cache page management
+Date: Tue, 22 Jun 2010 20:53:48 +0530
+Lines: 175
+Message-ID: <1277220228-3635-1-git-send-email-sjayaraman@suse.de>
+References: <yes>
+Cc: linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
+ linux-kernel@vger.kernel.org, David Howells <dhowells@redhat.com>
+To: Steve French <smfrench@gmail.com>
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+
+Takes care of invalidation and release of FS-Cache marked pages and also
+invalidation of the FsCache page flag when the inode is removed.
+
+Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
+---
+ fs/cifs/cache.c | 31 +++++++++++++++++++++++++++++++
+ fs/cifs/file.c | 20 ++++++++++++++++++++
+ fs/cifs/fscache.c | 26 ++++++++++++++++++++++++++
+ fs/cifs/fscache.h | 16 ++++++++++++++++
+ 4 files changed, 93 insertions(+), 0 deletions(-)
+
+diff --git a/fs/cifs/cache.c b/fs/cifs/cache.c
+index b205424..3a733c1 100644
+--- a/fs/cifs/cache.c
++++ b/fs/cifs/cache.c
+@@ -210,6 +210,36 @@ fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
+ return FSCACHE_CHECKAUX_OKAY;
+ }
+
++static void cifs_fscache_inode_now_uncached(void *cookie_netfs_data)
++{
++ struct cifsInodeInfo *cifsi = cookie_netfs_data;
++ struct pagevec pvec;
++ pgoff_t first;
++ int loop, nr_pages;
++
++ pagevec_init(&pvec, 0);
++ first = 0;
++
++ cFYI(1, "cifs inode 0x%p now uncached\n", cifsi);
++
++ for (;;) {
++ nr_pages = pagevec_lookup(&pvec,
++ cifsi->vfs_inode.i_mapping, first,
++ PAGEVEC_SIZE - pagevec_count(&pvec));
++ if (!nr_pages)
++ break;
++
++ for (loop = 0; loop < nr_pages; loop++)
++ ClearPageFsCache(pvec.pages[loop]);
++
++ first = pvec.pages[nr_pages - 1]->index + 1;
++
++ pvec.nr = nr_pages;
++ pagevec_release(&pvec);
++ cond_resched();
++ }
++}
++
+ const struct fscache_cookie_def cifs_fscache_inode_object_def = {
+ .name = "CIFS.uniqueid",
+ .type = FSCACHE_COOKIE_TYPE_DATAFILE,
+@@ -217,4 +247,5 @@ const struct fscache_cookie_def cifs_fscache_inode_object_def = {
+ .get_attr = cifs_fscache_inode_get_attr,
+ .get_aux = cifs_fscache_inode_get_aux,
+ .check_aux = cifs_fscache_inode_check_aux,
++ .now_uncached = cifs_fscache_inode_now_uncached,
+ };
+diff --git a/fs/cifs/file.c b/fs/cifs/file.c
+index 55ecb55..786ec04 100644
+--- a/fs/cifs/file.c
++++ b/fs/cifs/file.c
+@@ -2271,6 +2271,22 @@ out:
+ return rc;
+ }
+
++static int cifs_release_page(struct page *page, gfp_t gfp)
++{
++ if (PagePrivate(page))
++ return 0;
++
++ return cifs_fscache_release_page(page, gfp);
++}
++
++static void cifs_invalidate_page(struct page *page, unsigned long offset)
++{
++ struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
++
++ if (offset == 0)
++ cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
++}
++
+ static void
+ cifs_oplock_break(struct slow_work *work)
+ {
+@@ -2344,6 +2360,8 @@ const struct address_space_operations cifs_addr_ops = {
+ .write_begin = cifs_write_begin,
+ .write_end = cifs_write_end,
+ .set_page_dirty = __set_page_dirty_nobuffers,
++ .releasepage = cifs_release_page,
++ .invalidatepage = cifs_invalidate_page,
+ /* .sync_page = cifs_sync_page, */
+ /* .direct_IO = */
+ };
+@@ -2360,6 +2378,8 @@ const struct address_space_operations cifs_addr_ops_smallbuf = {
+ .write_begin = cifs_write_begin,
+ .write_end = cifs_write_end,
+ .set_page_dirty = __set_page_dirty_nobuffers,
++ .releasepage = cifs_release_page,
++ .invalidatepage = cifs_invalidate_page,
+ /* .sync_page = cifs_sync_page, */
+ /* .direct_IO = */
+ };
+diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
+index ddfd355..c09d3b8 100644
+--- a/fs/cifs/fscache.c
++++ b/fs/cifs/fscache.c
+@@ -130,3 +130,29 @@ void cifs_fscache_reset_inode_cookie(struct inode *inode)
+ }
+ }
+
++int cifs_fscache_release_page(struct page *page, gfp_t gfp)
++{
++ if (PageFsCache(page)) {
++ struct inode *inode = page->mapping->host;
++ struct cifsInodeInfo *cifsi = CIFS_I(inode);
++
++ cFYI(1, "CIFS: fscache release page (0x%p/0x%p)\n",
++ cifsi->fscache, page);
++ if (!fscache_maybe_release_page(cifsi->fscache, page, gfp))
++ return 0;
++ }
++
++ return 1;
++}
++
++void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
++{
++ struct cifsInodeInfo *cifsi = CIFS_I(inode);
++ struct fscache_cookie *cookie = cifsi->fscache;
++
++ cFYI(1, "CIFS: fscache invalidatepage (0x%p/0x%p/0x%p)\n",
++ cookie, page, cifsi);
++ fscache_wait_on_page_write(cookie, page);
++ fscache_uncache_page(cookie, page);
++}
++
+diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h
+index 836bb02..127cb0a 100644
+--- a/fs/cifs/fscache.h
++++ b/fs/cifs/fscache.h
+@@ -47,6 +47,16 @@ extern void cifs_fscache_release_inode_cookie(struct inode *);
+ extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
+ extern void cifs_fscache_reset_inode_cookie(struct inode *);
+
++extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
++extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
++
++static inline void cifs_fscache_invalidate_page(struct page *page,
++ struct inode *inode)
++{
++ if (PageFsCache(page))
++ __cifs_fscache_invalidate_page(page, inode);
++}
++
+ #else /* CONFIG_CIFS_FSCACHE */
+ static inline int cifs_fscache_register(void) { return 0; }
+ static inline void cifs_fscache_unregister(void) {}
+@@ -63,7 +73,13 @@ static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
+ static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
+ struct file *filp) {}
+ static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
++static inline void cifs_fscache_release_page(struct page *page, gfp_t gfp)
++{
++ return 1; /* May release page */
++}
+
++static inline int cifs_fscache_invalidate_page(struct page *page,
++ struct inode *) {}
+
+ #endif /* CONFIG_CIFS_FSCACHE */
+
+--
+1.6.4.2
+
+
+
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