From: Jeff Layton <jlay...@redhat.com>
We have this complex conditional copied to several places. Turn it into
a helper function.
Signed-off-by: Jeff Layton <jlay...@redhat.com>
---
mm/filemap.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index e1cca770688f..72e46e6f0d9a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -522,12 +522,17 @@ int filemap_fdatawait(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_fdatawait);
+static bool mapping_needs_writeback(struct address_space *mapping)
+{
+ return (!dax_mapping(mapping) && mapping->nrpages) ||
+ (dax_mapping(mapping) && mapping->nrexceptional);
+}
+
int filemap_write_and_wait(struct address_space *mapping)
{
int err = 0;
- if ((!dax_mapping(mapping) && mapping->nrpages) ||
- (dax_mapping(mapping) && mapping->nrexceptional)) {
+ if (mapping_needs_writeback(mapping)) {
err = filemap_fdatawrite(mapping);
/*
* Even if the above returned error, the pages may be
@@ -566,8 +571,7 @@ int filemap_write_and_wait_range(struct address_space
*mapping,
{
int err = 0;
- if ((!dax_mapping(mapping) && mapping->nrpages) ||
- (dax_mapping(mapping) && mapping->nrexceptional)) {
+ if (mapping_needs_writeback(mapping)) {
err = __filemap_fdatawrite_range(mapping, lstart, lend,
WB_SYNC_ALL);
/* See comment of filemap_write_and_wait() */
@@ -656,8 +660,7 @@ int file_write_and_wait_range(struct file *file, loff_t
lstart, loff_t lend)
int err = 0, err2;
struct address_space *mapping = file->f_mapping;
- if ((!dax_mapping(mapping) && mapping->nrpages) ||
- (dax_mapping(mapping) && mapping->nrexceptional)) {
+ if (mapping_needs_writeback(mapping)) {
err = __filemap_fdatawrite_range(mapping, lstart, lend,
WB_SYNC_ALL);
/* See comment of filemap_write_and_wait() */
--
2.13.3
