The function btree_migratepage will be extended from the baseclass
only when CONFIG_MIGRATION option is enabled. So, it''s useful to
define/build this function only when that config option is enabled.
Fixes an "unused function" compiler warning when CONFIG_MIGRATION
is not enabled and also removes an return -ENOSYS statement,
whose scenario will not happen.
Signed-off-by: Sankar P <sankar.curiosity@gmail.com>
---
fs/btrfs/disk-io.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c547cca..7199239 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -696,6 +696,7 @@ static int btree_submit_bio_hook(struct inode *inode, int
rw, struct bio *bio,
__btree_submit_bio_done);
}
+#ifdef CONFIG_MIGRATION
static int btree_migratepage(struct address_space *mapping,
struct page *newpage, struct page *page)
{
@@ -712,12 +713,9 @@ static int btree_migratepage(struct address_space *mapping,
if (page_has_private(page) &&
!try_to_release_page(page, GFP_KERNEL))
return -EAGAIN;
-#ifdef CONFIG_MIGRATION
return migrate_page(mapping, newpage, page);
-#else
- return -ENOSYS;
-#endif
}
+#endif
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
--
1.7.1