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-rw-r--r--mm/filemap.c36
1 files changed, 27 insertions, 9 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 0fad08331cf4..920e8dc03251 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -380,6 +380,32 @@ static int filemap_check_and_keep_errors(struct address_space *mapping)
}
/**
+ * filemap_fdatawrite_wbc - start writeback on mapping dirty pages in range
+ * @mapping: address space structure to write
+ * @wbc: the writeback_control controlling the writeout
+ *
+ * Call writepages on the mapping using the provided wbc to control the
+ * writeout.
+ *
+ * Return: %0 on success, negative error code otherwise.
+ */
+int filemap_fdatawrite_wbc(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ int ret;
+
+ if (!mapping_can_writeback(mapping) ||
+ !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
+ return 0;
+
+ wbc_attach_fdatawrite_inode(wbc, mapping->host);
+ ret = do_writepages(mapping, wbc);
+ wbc_detach_inode(wbc);
+ return ret;
+}
+EXPORT_SYMBOL(filemap_fdatawrite_wbc);
+
+/**
* __filemap_fdatawrite_range - start writeback on mapping dirty pages in range
* @mapping: address space structure to write
* @start: offset in bytes where the range starts
@@ -399,7 +425,6 @@ static int filemap_check_and_keep_errors(struct address_space *mapping)
int __filemap_fdatawrite_range(struct address_space *mapping, loff_t start,
loff_t end, int sync_mode)
{
- int ret;
struct writeback_control wbc = {
.sync_mode = sync_mode,
.nr_to_write = LONG_MAX,
@@ -407,14 +432,7 @@ int __filemap_fdatawrite_range(struct address_space *mapping, loff_t start,
.range_end = end,
};
- if (!mapping_can_writeback(mapping) ||
- !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
- return 0;
-
- wbc_attach_fdatawrite_inode(&wbc, mapping->host);
- ret = do_writepages(mapping, &wbc);
- wbc_detach_inode(&wbc);
- return ret;
+ return filemap_fdatawrite_wbc(mapping, &wbc);
}
static inline int __filemap_fdatawrite(struct address_space *mapping,