lookup_open(): put the dentry fed to ->lookup() or ->atomic_open() into in-lookup hash (6fbd0714) · Commits · e / devices / android_kernel_teracube_2e

fs/namei.c

+26 −11

Original line number	Diff line number	Diff line
		@@ -2842,6 +2842,7 @@ static int atomic_open(struct nameidata nd, struct dentry dentry,
		error = dir->i_op->atomic_open(dir, dentry, file,
		open_to_namei_flags(open_flag),
		mode, opened);
		d_lookup_done(dentry);
		if (!error) {
		/*
		* We didn't have the inode before the open, so check open
		@@ -2903,23 +2904,36 @@ static int lookup_open(struct nameidata nd, struct path path,
		int open_flag = op->open_flag;
		struct dentry *dentry;
		int error, create_error = 0;
		bool need_lookup = false;
		umode_t mode = op->mode;
		DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);

		if (unlikely(IS_DEADDIR(dir_inode)))
		return -ENOENT;

		*opened &= ~FILE_CREATED;
		dentry = lookup_dcache(&nd->last, dir, nd->flags);
		dentry = d_lookup(dir, &nd->last);
		for (;;) {
		if (!dentry) {
		dentry = d_alloc_parallel(dir, &nd->last, &wq);
		if (IS_ERR(dentry))
		return PTR_ERR(dentry);
		}
		if (d_in_lookup(dentry))
		break;

		if (!dentry) {
		dentry = d_alloc(dir, &nd->last);
		if (unlikely(!dentry))
		return -ENOMEM;
		need_lookup = true;
		} else if (dentry->d_inode) {
		if (!(dentry->d_flags & DCACHE_OP_REVALIDATE))
		break;

		error = d_revalidate(dentry, nd->flags);
		if (likely(error > 0))
		break;
		if (error)
		goto out_dput;
		d_invalidate(dentry);
		dput(dentry);
		dentry = NULL;
		}
		if (dentry->d_inode) {
		/* Cached positive dentry: will open in f_op->open */
		goto out_no_open;
		}
		@@ -2968,9 +2982,10 @@ static int lookup_open(struct nameidata nd, struct path path,
		}

		no_open:
		if (need_lookup) {
		if (d_in_lookup(dentry)) {
		struct dentry *res = dir_inode->i_op->lookup(dir_inode, dentry,
		nd->flags);
		d_lookup_done(dentry);
		if (unlikely(res)) {
		if (IS_ERR(res)) {
		error = PTR_ERR(res);