make sure data is on disk before calling ->write_inode

Similar to the fsync issue fixed a while ago in commit
2daea67e966dc0c42067ebea015ddac6834cef88 we need to write for data to
actually hit the disk before writing out the metadata to guarantee
data integrity for filesystems that modify the inode in the data I/O
completion path.  Currently XFS and NFS handle this manually, and AFS
has a write_inode method that does nothing but waiting for data, while
others are possibly missing out on this.

Fortunately this change has a lot less impact than the fsync change
as none of the write_inode methods starts data writeout of any form
by itself.

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

6 files changed, 11 insertions, 38 deletions

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 6ece2a1..c54dad4e60 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -733,7 +733,6 @@ extern int afs_write_end(struct file *file, struct address_space *mapping,
 			struct page *page, void *fsdata);
 extern int afs_writepage(struct page *, struct writeback_control *);
 extern int afs_writepages(struct address_space *, struct writeback_control *);
-extern int afs_write_inode(struct inode *, int);
 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
 			      unsigned long, loff_t);
diff --git a/fs/afs/super.c b/fs/afs/super.c
index e1ea1c2..14f6431 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -48,7 +48,6 @@ struct file_system_type afs_fs_type = {
 static const struct super_operations afs_super_ops = {
 	.statfs		= afs_statfs,
 	.alloc_inode	= afs_alloc_inode,
-	.write_inode	= afs_write_inode,
 	.destroy_inode	= afs_destroy_inode,
 	.clear_inode	= afs_clear_inode,
 	.put_super	= afs_put_super,
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 5e15a21..3bed54a 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -585,27 +585,6 @@ int afs_writepages(struct address_space *mapping,
 }
 
 /*
- * write an inode back
- */
-int afs_write_inode(struct inode *inode, int sync)
-{
-	struct afs_vnode *vnode = AFS_FS_I(inode);
-	int ret;
-
-	_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);
-
-	ret = 0;
-	if (sync) {
-		ret = filemap_fdatawait(inode->i_mapping);
-		if (ret < 0)
-			__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
-	}
-
-	_leave(" = %d", ret);
-	return ret;
-}
-
-/*
  * completion of write to server
  */
 void afs_pages_written_back(struct afs_vnode *vnode, struct afs_call *call)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 1a7c42c..5f2721b 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -461,15 +461,20 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
 
 	ret = do_writepages(mapping, wbc);
 
-	/* Don't write the inode if only I_DIRTY_PAGES was set */
-	if (dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) {
-		int err = write_inode(inode, wait);
+	/*
+	 * Make sure to wait on the data before writing out the metadata.
+	 * This is important for filesystems that modify metadata on data
+	 * I/O completion.
+	 */
+	if (wait) {
+		int err = filemap_fdatawait(mapping);
 		if (ret == 0)
 			ret = err;
 	}
 
-	if (wait) {
-		int err = filemap_fdatawait(mapping);
+	/* Don't write the inode if only I_DIRTY_PAGES was set */
+	if (dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) {
+		int err = write_inode(inode, wait);
 		if (ret == 0)
 			ret = err;
 	}
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 7570573..5ecd952 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -101,12 +101,7 @@ int nfs_write_inode(struct inode *inode, int sync)
 {
 	int ret;
 
-	if (sync) {
-		ret = filemap_fdatawait(inode->i_mapping);
-		if (ret == 0)
-			ret = nfs_commit_inode(inode, FLUSH_SYNC);
-	} else
-		ret = nfs_commit_inode(inode, 0);
+	ret = nfs_commit_inode(inode, sync ? FLUSH_SYNC : 0);
 	if (ret >= 0)
 		return 0;
 	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 25ea240..8f117db 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1075,10 +1075,6 @@ xfs_fs_write_inode(
 		return XFS_ERROR(EIO);
 
 	if (sync) {
-		error = xfs_wait_on_pages(ip, 0, -1);
-		if (error)
-			goto out;
-
 		/*
 		 * Make sure the inode has hit stable storage.  By using the
 		 * log and the fsync transactions we reduce the IOs we have