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e850d9a52f
This patch adds the following helper structure and routines into badblocks.h, - struct badblocks_context This structure is used in improved badblocks code for bad table iteration. - BB_END() The macro to calculate end LBA of a bad range record from bad table. - badblocks_full() and badblocks_empty() The inline routines to check whether bad table is full or empty. - set_changed() and clear_changed() The inline routines to set and clear 'changed' tag from struct badblocks. These new helper structure and routines can help to make the code more clear, they will be used in the improved badblocks code in following patches. Signed-off-by: Coly Li <colyli@suse.de> Reviewed-by: Xiao Ni <xni@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Geliang Tang <geliang.tang@suse.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: NeilBrown <neilb@suse.de> Cc: Vishal L Verma <vishal.l.verma@intel.com> Acked-by: Geliang Tang <geliang.tang@suse.com> Link: https://lore.kernel.org/r/20230811170513.2300-2-colyli@suse.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/* 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_END(x) (BB_OFFSET(x) + BB_LEN(x))
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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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struct badblocks_context {
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sector_t start;
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sector_t len;
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int ack;
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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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static inline int badblocks_full(struct badblocks *bb)
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{
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return (bb->count >= MAX_BADBLOCKS);
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}
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static inline int badblocks_empty(struct badblocks *bb)
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{
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return (bb->count == 0);
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}
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static inline void set_changed(struct badblocks *bb)
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{
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if (bb->changed != 1)
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bb->changed = 1;
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}
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static inline void clear_changed(struct badblocks *bb)
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{
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if (bb->changed != 0)
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bb->changed = 0;
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}
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#endif
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