[RFC PATCH 01/26] VFS: introduce writeback_inodes_sb()

[Artem Bityutskiy]

Let file systems to writeback their pages and inodes when needed. This
is needed for UBIFS budgeting sub-system because it has to force
write-back from time to time.

Note, it cannot be called if one of the dirty pages is locked by
the caller, otherwise it'll deadlock.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@xxxxxxxxx>
---
 fs/fs-writeback.c         |    8 ++++++++
 include/linux/writeback.h |    1 +
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index c007607..062aa4a 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -573,6 +573,14 @@ void sync_inodes_sb(struct super_block *sb, int wait)
 	spin_unlock(&inode_lock);
 }
 
+void writeback_inodes_sb(struct super_block *sb, struct writeback_control *wbc)
+{
+	spin_lock(&inode_lock);
+	sync_sb_inodes(sb, wbc);
+	spin_unlock(&inode_lock);
+}
+EXPORT_SYMBOL_GPL(writeback_inodes_sb);
+
 /*
  * Rather lame livelock avoidance.
  */
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index b7b3362..0083a0a 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -71,6 +71,7 @@ struct writeback_control {
 void writeback_inodes(struct writeback_control *wbc);
 int inode_wait(void *);
 void sync_inodes_sb(struct super_block *, int wait);
+void writeback_inodes_sb(struct super_block *sb, struct writeback_control *wbc);
 void sync_inodes(int wait);
 
 /* writeback.h requires fs.h; it, too, is not included from here. */
-- 
1.5.4.1

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