/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_BADBLOCKS_H
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#define _LINUX_BADBLOCKS_H
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#include <linux/seqlock.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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#define BB_LEN_MASK (0x00000000000001FFULL)
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#define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)
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#define BB_ACK_MASK (0x8000000000000000ULL)
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#define BB_MAX_LEN 512
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#define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
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#define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
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#define BB_ACK(x) (!!((x) & BB_ACK_MASK))
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#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
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/* Bad block numbers are stored sorted in a single page.
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* 64bits is used for each block or extent.
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* 54 bits are sector number, 9 bits are extent size,
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* 1 bit is an 'acknowledged' flag.
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*/
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#define MAX_BADBLOCKS (PAGE_SIZE/8)
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struct badblocks {
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struct device *dev; /* set by devm_init_badblocks */
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int count; /* count of bad blocks */
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int unacked_exist; /* there probably are unacknowledged
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* bad blocks. This is only cleared
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* when a read discovers none
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*/
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int shift; /* shift from sectors to block size
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* a -ve shift means badblocks are
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* disabled.*/
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u64 *page; /* badblock list */
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int changed;
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seqlock_t lock;
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sector_t sector;
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sector_t size; /* in sectors */
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};
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int badblocks_check(struct badblocks *bb, sector_t s, int sectors,
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sector_t *first_bad, int *bad_sectors);
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int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
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int acknowledged);
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int badblocks_clear(struct badblocks *bb, sector_t s, int sectors);
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void ack_all_badblocks(struct badblocks *bb);
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ssize_t badblocks_show(struct badblocks *bb, char *page, int unack);
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ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len,
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int unack);
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int badblocks_init(struct badblocks *bb, int enable);
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void badblocks_exit(struct badblocks *bb);
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struct device;
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int devm_init_badblocks(struct device *dev, struct badblocks *bb);
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static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb)
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{
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if (bb->dev != dev) {
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dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n",
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__func__);
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return;
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}
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badblocks_exit(bb);
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}
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#endif
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