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335426c6dc
One requirement to support MTD devices in pstore/zone is having a way to declare certain regions as broken. Add this support to pstore/zone. The MTD driver should return -ENOMSG when encountering a bad region, which tells pstore/zone to skip and try the next one. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-8-keescook@chromium.org/ Co-developed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: //lore.kernel.org/lkml/20200512173801.222666-1-colin.king@canonical.com Signed-off-by: Kees Cook <keescook@chromium.org>
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PSTORE_BLK_H_
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#define __PSTORE_BLK_H_
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#include <linux/types.h>
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#include <linux/pstore.h>
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#include <linux/pstore_zone.h>
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/**
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* typedef pstore_blk_panic_write_op - panic write operation to block device
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*
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* @buf: the data to write
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* @start_sect: start sector to block device
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* @sects: sectors count on buf
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*
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* Return: On success, zero should be returned. Others excluding -ENOMSG
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* mean error. -ENOMSG means to try next zone.
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*
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* Panic write to block device must be aligned to SECTOR_SIZE.
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*/
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typedef int (*pstore_blk_panic_write_op)(const char *buf, sector_t start_sect,
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sector_t sects);
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/**
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* struct pstore_blk_info - pstore/blk registration details
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*
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* @major: Which major device number to support with pstore/blk
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* @flags: The supported PSTORE_FLAGS_* from linux/pstore.h.
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* @panic_write:The write operation only used for the panic case.
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* This can be NULL, but is recommended to avoid losing
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* crash data if the kernel's IO path or work queues are
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* broken during a panic.
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* @devt: The dev_t that pstore/blk has attached to.
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* @nr_sects: Number of sectors on @devt.
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* @start_sect: Starting sector on @devt.
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*/
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struct pstore_blk_info {
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unsigned int major;
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unsigned int flags;
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pstore_blk_panic_write_op panic_write;
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/* Filled in by pstore/blk after registration. */
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dev_t devt;
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sector_t nr_sects;
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sector_t start_sect;
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};
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int register_pstore_blk(struct pstore_blk_info *info);
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void unregister_pstore_blk(unsigned int major);
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#endif
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