Re: [BUGFIX][PATCH 1/3] configfs: Fix symlink() to a removing item

Joel Becker
2008-06-17T22:21:42Z

On Tue, Jun 17, 2008 at 07:37:21PM +0200, Louis Rilling wrote:
> This patch makes configfs_symlink() fail whenever the target is being removed,
> using the CONFIGFS_USET_DROPPING flag set by configfs_detach_prep() and
> protected by configfs_dirent_lock.
> diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
> index faeb441..58722a9 100644
> --- a/fs/configfs/symlink.c
> +++ b/fs/configfs/symlink.c
> @@ -78,6 +78,12 @@ static int create_link(struct config_item *parent_item,
> if (sl) {
> sl->sl_target = config_item_get(item);
> spin_lock(&configfs_dirent_lock);
> + if (target_sd->s_type & CONFIGFS_USET_DROPPING) {
> + spin_unlock(&configfs_dirent_lock);
> + config_item_put(item);
> + kfree(sl);
> + return -EPERM;

This needs to be -ENOENT. If rmdir set DROPPING and then
released dirent_lock, it's going to remove the target. That's ENOENT.

Joel

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"Sometimes when reading Goethe I have the paralyzing suspicion
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Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127