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authorAl Viro <viro@zeniv.linux.org.uk>2009-06-07 14:56:44 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2009-06-11 21:36:11 -0400
commitd5aacad548db1ff547adf35d0a77eb2a8ed4fe14 (patch)
treefbdf12dbacde76a1bb57738f1f67b87a673ddff2 /fs/libfs.c
parent337eb00a2c3a421999c39c94ce7e33545ee8baa7 (diff)
downloadlinux-linaro-stable-d5aacad548db1ff547adf35d0a77eb2a8ed4fe14.tar.gz
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>
Diffstat (limited to 'fs/libfs.c')
-rw-r--r--fs/libfs.c25
1 files changed, 25 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);