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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PSTORE_BLK_H_
#define __PSTORE_BLK_H_
#include <linux/types.h>
#include <linux/pstore.h>
#include <linux/pstore_zone.h>
/**
* typedef pstore_blk_panic_write_op - panic write operation to block device
*
* @buf: the data to write
* @start_sect: start sector to block device
* @sects: sectors count on buf
*
* Return: On success, zero should be returned. Others mean error.
*
* Panic write to block device must be aligned to SECTOR_SIZE.
*/
typedef int (*pstore_blk_panic_write_op)(const char *buf, sector_t start_sect,
sector_t sects);
/**
* struct pstore_blk_info - pstore/blk registration details
*
* @major: Which major device number to support with pstore/blk
* @flags: The supported PSTORE_FLAGS_* from linux/pstore.h.
* @panic_write:The write operation only used for the panic case.
* This can be NULL, but is recommended to avoid losing
* crash data if the kernel's IO path or work queues are
* broken during a panic.
* @devt: The dev_t that pstore/blk has attached to.
* @nr_sects: Number of sectors on @devt.
* @start_sect: Starting sector on @devt.
*/
struct pstore_blk_info {
unsigned int major;
unsigned int flags;
pstore_blk_panic_write_op panic_write;
/* Filled in by pstore/blk after registration. */
dev_t devt;
sector_t nr_sects;
sector_t start_sect;
};
int register_pstore_blk(struct pstore_blk_info *info);
void unregister_pstore_blk(unsigned int major);
#endif
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