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-rw-r--r--fs/fscache/io.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
index 74cde7acf434..e9e5d6758ea8 100644
--- a/fs/fscache/io.c
+++ b/fs/fscache/io.c
@@ -150,6 +150,44 @@ int __fscache_begin_read_operation(struct netfs_cache_resources *cres,
}
EXPORT_SYMBOL(__fscache_begin_read_operation);
+/**
+ * fscache_set_page_dirty - Mark page dirty and pin a cache object for writeback
+ * @page: The page being dirtied
+ * @cookie: The cookie referring to the cache object
+ *
+ * Set the dirty flag on a page and pin an in-use cache object in memory when
+ * dirtying a page so that writeback can later write to it. This is intended
+ * to be called from the filesystem's ->set_page_dirty() method.
+ *
+ * Returns 1 if PG_dirty was set on the page, 0 otherwise.
+ */
+int fscache_set_page_dirty(struct page *page, struct fscache_cookie *cookie)
+{
+ struct inode *inode = page->mapping->host;
+ bool need_use = false;
+
+ _enter("");
+
+ if (!__set_page_dirty_nobuffers(page))
+ return 0;
+ if (!fscache_cookie_valid(cookie))
+ return 1;
+
+ if (!(inode->i_state & I_PINNING_FSCACHE_WB)) {
+ spin_lock(&inode->i_lock);
+ if (!(inode->i_state & I_PINNING_FSCACHE_WB)) {
+ inode->i_state |= I_PINNING_FSCACHE_WB;
+ need_use = true;
+ }
+ spin_unlock(&inode->i_lock);
+
+ if (need_use)
+ fscache_use_cookie(cookie, true);
+ }
+ return 1;
+}
+EXPORT_SYMBOL(fscache_set_page_dirty);
+
struct fscache_write_request {
struct netfs_cache_resources cache_resources;
struct address_space *mapping;