On Wed, Oct 27, 2010 at 03:23:01PM +1100, Dave Chinner wrote:
> spin_lock(&inode_lock);
> list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
> - if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW))
> + spin_lock(&inode->i_lock);
> + if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) {
> + spin_unlock(&inode->i_lock);
> continue;
> + }
> + spin_unlock(&inode->i_lock);
> if (inode->i_mapping->nrpages == 0)
> continue;
> __iget(inode);
If you want to remove inode_lock from the lru scanning later you already
need to extend i_lock coverage to include __iget here. Otherwise we
could race to mark the inode as I_FREEING or I_WILL_FREE before we
grabbed a reference after your patchset.
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