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-rw-r--r--fs/fs-writeback.c6
-rw-r--r--fs/internal.h2
2 files changed, 5 insertions, 3 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 0639024d83a..c403b66ec83 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -319,7 +319,7 @@ sync_sb_inodes(struct super_block *sb, struct writeback_control *wbc)
if (!bdi_cap_writeback_dirty(bdi)) {
list_move(&inode->i_list, &sb->s_dirty);
- if (sb == blockdev_superblock) {
+ if (sb_is_blkdev_sb(sb)) {
/*
* Dirty memory-backed blockdev: the ramdisk
* driver does this. Skip just this inode
@@ -336,14 +336,14 @@ sync_sb_inodes(struct super_block *sb, struct writeback_control *wbc)
if (wbc->nonblocking && bdi_write_congested(bdi)) {
wbc->encountered_congestion = 1;
- if (sb != blockdev_superblock)
+ if (!sb_is_blkdev_sb(sb))
break; /* Skip a congested fs */
list_move(&inode->i_list, &sb->s_dirty);
continue; /* Skip a congested blockdev */
}
if (wbc->bdi && bdi != wbc->bdi) {
- if (sb != blockdev_superblock)
+ if (!sb_is_blkdev_sb(sb))
break; /* fs has the wrong queue */
list_move(&inode->i_list, &sb->s_dirty);
continue; /* blockdev has wrong queue */
diff --git a/fs/internal.h b/fs/internal.h
index c21ecd37b1e..f662b703bb9 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -17,6 +17,8 @@
extern struct super_block *blockdev_superblock;
extern void __init bdev_cache_init(void);
+#define sb_is_blkdev_sb(sb) ((sb) == blockdev_superblock)
+
/*
* char_dev.c
*/