add two more might_sleep() checks: to sync_inode() and
generic_osync_inode().

Signed-off-by: Ingo Molnar <mingo@elte.hu>

--- linux/fs/fs-writeback.c.orig	
+++ linux/fs/fs-writeback.c	
@@ -578,6 +578,7 @@ int sync_inode(struct inode *inode, stru
 {
 	int ret;
 
+	might_sleep();
 	spin_lock(&inode_lock);
 	ret = __writeback_single_inode(inode, wbc);
 	spin_unlock(&inode_lock);
@@ -622,6 +623,7 @@ int generic_osync_inode(struct inode *in
 	}
 	current->flags &= ~PF_SYNCWRITE;
 
+	might_sleep();
 	spin_lock(&inode_lock);
 	if ((inode->i_state & I_DIRTY) &&
 	    ((what & OSYNC_INODE) || (inode->i_state & I_DIRTY_DATASYNC)))