On Sat, Jul 30, 2011 at 12:32:04PM -0400, Ted Ts'o wrote:
> spin_lock(&inode->i_lock);
> if (!list_empty(&inode->i_dentry)) {
> dentry = list_first_entry(&inode->i_dentry,
> struct dentry, d_alias);
> dget(dentry);
> }
> spin_unlock(&inode->i_lock);
dentry = d_find_alias(inode);
actually...
> if (!dentry)
> break;
> next = igrab(dentry->d_parent->d_inode);
and that one needs dentry->d_lock around it, to stabilize ->d_parent.
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