[Bug 548924] Re: aufs broken in ti-omap kernel

[Amit Kucheria]

This[1] is not an oops, but a BUG_ON() called on purpose inside the aufs
code. The function follows:

static int do_open_nondir(struct file *file, int flags)
{
	int err;
	aufs_bindex_t bindex;
	struct file *h_file;
	struct dentry *dentry;
	struct au_finfo *finfo;

        FiMustWriteLock(file);

	err = 0;
	dentry = file->f_dentry;
	finfo = au_fi(file);
	finfo->fi_h_vm_ops = NULL;
	finfo->fi_vm_ops = NULL;
	bindex = au_dbstart(dentry);
	/* O_TRUNC is processed already */
	BUG_ON(au_test_ro(dentry->d_sb, bindex, dentry->d_inode)
	       && (flags & O_TRUNC));

	h_file = au_h_open(dentry, bindex, flags, file);
	if (IS_ERR(h_file))
		err = PTR_ERR(h_file);
	else {
		au_set_fbstart(file, bindex);
		au_set_fbend(file, bindex);
		au_set_h_fptr(file, bindex, h_file);
		au_update_figen(file);
		/* todo: necessary? */
		/* file->f_ra = h_file->f_ra; */
	}
	return err;
}

>From the fragment, triggering the BUG_ON(), it seems to check if the
aufs file/branch is readonly and if a truncate flag is set on the file.

So my question then is, are we doing something illegal according to aufs
expectations?

[1] kernel BUG at /build/buildd/linux-ti-
omap-2.6.33/ubuntu/aufs/f_op.c:84!


** Changed in: linux-ti-omap (Ubuntu Lucid)
       Status: Triaged => In Progress

-- 
aufs broken in ti-omap kernel
https://bugs.launchpad.net/bugs/548924
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