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Rosen Penev
e19eaffc52
A flex array can be used to reduce the allocation to 1. And actually mtdconcat was using the pointer + 1 trick to point to the overallocated area. Better alternatives exist. Signed-off-by: Rosen Penev <rosenp@gmail.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* MTD device concatenation layer definitions
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*
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* Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de>
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*/
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#ifndef MTD_CONCAT_H
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#define MTD_CONCAT_H
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/*
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* Our storage structure:
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* Subdev points to an array of pointers to struct mtd_info objects
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* which is allocated along with this structure
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*
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*/
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struct mtd_concat {
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struct mtd_info mtd;
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int num_subdev;
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struct mtd_info *subdev[];
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};
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struct mtd_info *mtd_concat_create(
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struct mtd_info *subdev[], /* subdevices to concatenate */
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int num_devs, /* number of subdevices */
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const char *name); /* name for the new device */
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void mtd_concat_destroy(struct mtd_info *mtd);
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/**
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* mtd_virt_concat_node_create - Create a component for concatenation
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*
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* Returns a positive number representing the no. of devices found for
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* concatenation, or a negative error code.
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*
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* List all the devices for concatenations found in DT and create a
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* component for concatenation.
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*/
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int mtd_virt_concat_node_create(void);
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/**
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* mtd_virt_concat_add - add mtd_info object to the list of subdevices for concatenation
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* @mtd: pointer to new MTD device info structure
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*
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* Returns true if the mtd_info object is added successfully else returns false.
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*
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* The mtd_info object is added to the list of subdevices for concatenation.
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* It returns true if a match is found, and false if all subdevices have
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* already been added or if the mtd_info object does not match any of the
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* intended MTD devices.
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*/
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bool mtd_virt_concat_add(struct mtd_info *mtd);
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/**
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* mtd_virt_concat_create_join - Create and register the concatenated MTD device
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*
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* Returns 0 on succes, or a negative error code.
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*
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* Creates and registers the concatenated MTD device
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*/
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int mtd_virt_concat_create_join(void);
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/**
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* mtd_virt_concat_destroy - Remove the concat that includes a specific mtd device
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* as one of its components.
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* @mtd: pointer to MTD device info structure.
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*
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* Returns 0 on succes, or a negative error code.
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*
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* If the mtd_info object is part of a concatenated device, all other MTD devices
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* within that concat are registered individually. The concatenated device is then
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* removed, along with its concatenation component.
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*
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*/
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int mtd_virt_concat_destroy(struct mtd_info *mtd);
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void mtd_virt_concat_destroy_joins(void);
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void mtd_virt_concat_destroy_items(void);
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#endif
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