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Date: Tue, 22 Jun 2010 20:53:48 +0530
From: Suresh Jayaraman <sjayaraman@...e.de>
To: Steve French <smfrench@...il.com>
Cc: linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [RFC][PATCH 07/10] cifs: FS-Cache page management
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@...e.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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