fs: add sync_inode_metadata

Add a new helper to write out the inode using the writeback code,
that is including the correct dirty bit and list manipulation.  A few
of filesystems already opencode this, and a lot of others should be
using it instead of using write_inode_now which also writes out the
data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 5 deletions

diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index 68cb23e3bb98..b905c79b4f0a 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -46,10 +46,6 @@ static int exofs_file_fsync(struct file *filp, int datasync)
 {
         int ret;
         struct inode *inode = filp->f_mapping->host;
-        struct writeback_control wbc = {
-                .sync_mode = WB_SYNC_ALL,
-                .nr_to_write = 0, /* metadata-only; caller takes care of data */
-        };
         struct super_block *sb;
 
         if (!(inode->i_state & I_DIRTY))
@@ -57,7 +53,7 @@ static int exofs_file_fsync(struct file *filp, int datasync)
         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
                 return 0;
 
-        ret = sync_inode(inode, &wbc);
+        ret = sync_inode_metadata(inode, 1);
 
         /* This is a good place to write the sb */
         /* TODO: Sechedule an sb-sync on create */