New helper - simple_fsync()

writes associated buffers, then does sync_inode() to write
the inode itself (and to make it clean).  Depends on
->write_inode() honouring the second argument.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 27 insertions, 0 deletions

diff --git a/fs/libfs.c b/fs/libfs.c
index 80046ddf5063..ddfa89948c3f 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -9,6 +9,8 @@
 #include <linux/vfs.h>
 #include <linux/mutex.h>
 #include <linux/exportfs.h>
+#include <linux/writeback.h>
+#include <linux/buffer_head.h>
 
 #include <asm/uaccess.h>
 
@@ -807,6 +809,29 @@ struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid,
 }
 EXPORT_SYMBOL_GPL(generic_fh_to_parent);
 
+int simple_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+        struct writeback_control wbc = {
+                .sync_mode = WB_SYNC_ALL,
+                .nr_to_write = 0, /* metadata-only; caller takes care of data */
+        };
+        struct inode *inode = dentry->d_inode;
+        int err;
+        int ret;
+
+        ret = sync_mapping_buffers(inode->i_mapping);
+        if (!(inode->i_state & I_DIRTY))
+                return ret;
+        if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
+                return ret;
+
+        err = sync_inode(inode, &wbc);
+        if (ret == 0)
+                ret = err;
+        return ret;
+}
+EXPORT_SYMBOL(simple_fsync);
+
 EXPORT_SYMBOL(dcache_dir_close);
 EXPORT_SYMBOL(dcache_dir_lseek);
 EXPORT_SYMBOL(dcache_dir_open);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d883aa1fc2eb..ede84fa7da5d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2345,6 +2345,8 @@ extern void simple_release_fs(struct vfsmount **mount, int *count);
 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
                         loff_t *ppos, const void *from, size_t available);
 
+extern int simple_fsync(struct file *, struct dentry *, int);
+
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,
                                 struct page *, struct page *);