[PATCH 3/6] fs/9p: Writeback dirty data before setattr

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

change file attribute can result in making the file readonly.
So flush the dirty pages before that.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 fs/9p/vfs_inode.c      |    4 ++++
 fs/9p/vfs_inode_dotl.c |    4 ++++
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 7c60011..e49c592 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1002,6 +1002,10 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
 		if (retval)
 			return retval;
 	}
+	/* Write all dirty data */
+	if (S_ISREG(dentry->d_inode->i_mode))
+		filemap_write_and_wait(dentry->d_inode->i_mapping);
+
 	retval = p9_client_wstat(fid, &wstat);
 	if (retval < 0)
 		return retval;
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index b14d740..327c578 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -462,6 +462,10 @@ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 		if (retval)
 			return retval;
 	}
+	/* Write all dirty data */
+	if (S_ISREG(dentry->d_inode->i_mode))
+		filemap_write_and_wait(dentry->d_inode->i_mapping);
+
 	retval = p9_client_setattr(fid, &p9attr);
 	if (retval < 0)
 		return retval;
-- 
1.7.1