Commit 474b9370 authored by Richard Weinberger's avatar Richard Weinberger
Browse files

ubifs: Implement O_TMPFILE 



This patchs adds O_TMPFILE support to UBIFS.
A temp file is a reference to an unlinked inode, a user
holding the reference can use it. As soon it is being closed
all data vanishes.

Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent f7d11b33

fs/ubifs/dir.c

+71 −0
Original line number Diff line number Diff line
@@ -301,6 +301,76 @@ out_budg: 
	return err;

}



static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,

			 umode_t mode)

{

	struct inode *inode;

	struct ubifs_info *c = dir->i_sb->s_fs_info;

	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1};

	struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };

	struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);

	int err, instantiated = 0;



	/*

	 * Budget request settings: new dirty inode, new direntry,

	 * budget for dirtied inode will be released via writeback.

	 */



	dbg_gen("dent '%pd', mode %#hx in dir ino %lu",

		dentry, mode, dir->i_ino);



	err = ubifs_budget_space(c, &req);

	if (err)

		return err;



	err = ubifs_budget_space(c, &ino_req);

	if (err) {

		ubifs_release_budget(c, &req);

		return err;

	}



	inode = ubifs_new_inode(c, dir, mode);

	if (IS_ERR(inode)) {

		err = PTR_ERR(inode);

		goto out_budg;

	}

	ui = ubifs_inode(inode);



	err = ubifs_init_security(dir, inode, &dentry->d_name);

	if (err)

		goto out_inode;



	mutex_lock(&ui->ui_mutex);

	insert_inode_hash(inode);

	d_tmpfile(dentry, inode);

	ubifs_assert(ui->dirty);

	instantiated = 1;

	mutex_unlock(&ui->ui_mutex);



	mutex_lock(&dir_ui->ui_mutex);

	err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);

	if (err)

		goto out_cancel;

	mutex_unlock(&dir_ui->ui_mutex);



	ubifs_release_budget(c, &req);



	return 0;



out_cancel:

	mutex_unlock(&dir_ui->ui_mutex);

out_inode:

	make_bad_inode(inode);

	if (!instantiated)

		iput(inode);

out_budg:

	ubifs_release_budget(c, &req);

	if (!instantiated)

		ubifs_release_budget(c, &ino_req);

	ubifs_err(c, "cannot create temporary file, error %d", err);

	return err;

}



/**

 * vfs_dent_type - get VFS directory entry type.

 * @type: UBIFS directory entry type
@@ -1189,6 +1259,7 @@ const struct inode_operations ubifs_dir_inode_operations = { 
#ifdef CONFIG_UBIFS_ATIME_SUPPORT

	.update_time = ubifs_update_time,

#endif

	.tmpfile     = ubifs_tmpfile,

};



const struct file_operations ubifs_dir_operations = {

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