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Commit 35759521 authored by Al Viro's avatar Al Viro
Browse files

take unlazy_walk() into umount_lookup_last() 



... and massage it a bit to reduce nesting

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 4e10f3c9

fs/namei.c

+27 −33
Original line number Diff line number Diff line
@@ -2256,19 +2256,22 @@ umount_lookup_last(struct nameidata *nd, struct path *path) 
	struct dentry *dentry;

	struct dentry *dir = nd->path.dentry;



	if (unlikely(nd->flags & LOOKUP_RCU)) {

		WARN_ON_ONCE(1);

	/* If we're in rcuwalk, drop out of it to handle last component */

	if (nd->flags & LOOKUP_RCU) {

		if (unlazy_walk(nd, NULL)) {

			error = -ECHILD;

		goto error_check;

			goto out;

		}

	}



	nd->flags &= ~LOOKUP_PARENT;



	if (unlikely(nd->last_type != LAST_NORM)) {

		error = handle_dots(nd, nd->last_type);

		if (!error)

		if (error)

			goto out;

		dentry = dget(nd->path.dentry);

		goto error_check;

		goto done;

	}



	mutex_lock(&dir->d_inode->i_mutex);
@@ -2282,28 +2285,28 @@ umount_lookup_last(struct nameidata *nd, struct path *path) 
		dentry = d_alloc(dir, &nd->last);

		if (!dentry) {

			error = -ENOMEM;

		} else {

			goto out;

		}

		dentry = lookup_real(dir->d_inode, dentry, nd->flags);

			if (IS_ERR(dentry))

		error = PTR_ERR(dentry);

		}

		if (IS_ERR(dentry))

			goto out;

	}

	mutex_unlock(&dir->d_inode->i_mutex);



error_check:

	if (!error) {

done:

	if (!dentry->d_inode) {

		error = -ENOENT;

		dput(dentry);

		} else {

		goto out;

	}

	path->dentry = dentry;

	path->mnt = mntget(nd->path.mnt);

			if (should_follow_link(dentry->d_inode,

						nd->flags & LOOKUP_FOLLOW))

	if (should_follow_link(dentry->d_inode, nd->flags & LOOKUP_FOLLOW))

		return 1;

	follow_mount(path);

		}

	}

	error = 0;

out:

	terminate_walk(nd);

	return error;

}
@@ -2334,15 +2337,6 @@ path_umountat(int dfd, const char *name, struct path *path, unsigned int flags) 
	if (err)

		goto out;



	/* If we're in rcuwalk, drop out of it to handle last component */

	if (nd.flags & LOOKUP_RCU) {

		err = unlazy_walk(&nd, NULL);

		if (err) {

			terminate_walk(&nd);

			goto out;

		}

	}



	err = umount_lookup_last(&nd, path);

	while (err > 0) {

		void *cookie;