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Commit 4453641f authored by Al Viro's avatar Al Viro
Browse files

__d_materialise_dentry(): flip the order of arguments 



... thus making it much closer to (now unreachable, BTW) IS_ROOT(dentry)
case in __d_move().  A bit more and it'll fold in.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 9d8cd306

fs/dcache.c

+20 −24
Original line number Diff line number Diff line
@@ -2635,38 +2635,34 @@ static struct dentry *__d_unalias(struct inode *inode, 
 * Prepare an anonymous dentry for life in the superblock's dentry tree as a

 * named dentry in place of the dentry to be replaced.

 */

static void __d_materialise_dentry(struct dentry *dentry, struct dentry *anon)

static void __d_materialise_dentry(struct dentry *dentry, struct dentry *target)

{

	struct dentry *dparent;



	dentry_lock_for_move(anon, dentry);

	dentry_lock_for_move(dentry, target);



	write_seqcount_begin(&dentry->d_seq);

	write_seqcount_begin_nested(&anon->d_seq, DENTRY_D_LOCK_NESTED);



	dparent = dentry->d_parent;

	write_seqcount_begin_nested(&target->d_seq, DENTRY_D_LOCK_NESTED);



	switch_names(dentry, anon);

	swap(dentry->d_name.hash, anon->d_name.hash);

	switch_names(dentry, target);

	swap(dentry->d_name.hash, target->d_name.hash);



	dentry->d_parent = dentry;

	list_del_init(&dentry->d_u.d_child);

	anon->d_parent = dparent;

	list_move(&anon->d_u.d_child, &dparent->d_subdirs);

	if (likely(!d_unhashed(anon))) {

		hlist_bl_lock(&anon->d_sb->s_anon);

		__hlist_bl_del(&anon->d_hash);

		anon->d_hash.pprev = NULL;

		hlist_bl_unlock(&anon->d_sb->s_anon);

	dentry->d_parent = target->d_parent;

	target->d_parent = target;

	list_del_init(&target->d_u.d_child);

	list_move(&dentry->d_u.d_child, &dentry->d_parent->d_subdirs);

	if (likely(!d_unhashed(dentry))) {

		hlist_bl_lock(&dentry->d_sb->s_anon);

		__hlist_bl_del(&dentry->d_hash);

		dentry->d_hash.pprev = NULL;

		hlist_bl_unlock(&dentry->d_sb->s_anon);

	}

	__d_rehash(anon, d_hash(anon->d_parent, anon->d_name.hash));

	__d_rehash(dentry, d_hash(dentry->d_parent, dentry->d_name.hash));



	write_seqcount_end(&target->d_seq);

	write_seqcount_end(&dentry->d_seq);

	write_seqcount_end(&anon->d_seq);



	dentry_unlock_parents_for_move(anon, dentry);

	dentry_unlock_parents_for_move(dentry, target);

	spin_unlock(&target->d_lock);

	spin_unlock(&dentry->d_lock);

	spin_unlock(&anon->d_lock);

}



/**
@@ -2714,7 +2710,7 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry) 
				return ERR_PTR(-EIO);

			}

			write_seqlock(&rename_lock);

			__d_materialise_dentry(dentry, new);

			__d_materialise_dentry(new, dentry);

			write_sequnlock(&rename_lock);

			spin_unlock(&inode->i_lock);

			security_d_instantiate(new, inode);
@@ -2775,7 +2771,7 @@ struct dentry *d_materialise_unique(struct dentry *dentry, struct inode *inode) 
			} else if (IS_ROOT(alias)) {

				/* Is this an anonymous mountpoint that we

				 * could splice into our tree? */

				__d_materialise_dentry(dentry, alias);

				__d_materialise_dentry(alias, dentry);

				write_sequnlock(&rename_lock);

				goto found;

			} else {