fs/9p: Writeback dirty data before setattr

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>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 2555776920ad..8a2c232f708a 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -999,6 +999,10 @@ 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 bcd0ee2e549a..67c138e94feb 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -459,6 +459,10 @@ 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;