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md/raid1-10: add a helper raid1_check_read_range()

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The checking and handler of bad blocks appear many timers during
read_balance() in raid1 and raid10. This helper will be used in later
patches to simplify read_balance() a lot.

Co-developed-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240229095714.926789-6-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2024-02-29 17:57:08 +08:00 committed by Song Liu
parent 257ac239ff
commit f29841ff3b
1 changed files with 49 additions and 0 deletions
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49
drivers/md/raid1-10.c
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@ -227,3 +227,52 @@ static inline bool exceed_read_errors(struct mddev *mddev, struct md_rdev *rdev)
return false;
}
/**
* raid1_check_read_range() - check a given read range for bad blocks,
* available read length is returned;
* @rdev: the rdev to read;
* @this_sector: read position;
* @len: read length;
*
* helper function for read_balance()
*
* 1) If there are no bad blocks in the range, @len is returned;
* 2) If the range are all bad blocks, 0 is returned;
* 3) If there are partial bad blocks:
* - If the bad block range starts after @this_sector, the length of first
* good region is returned;
* - If the bad block range starts before @this_sector, 0 is returned and
* the @len is updated to the offset into the region before we get to the
* good blocks;
*/
static inline int raid1_check_read_range(struct md_rdev *rdev,
sector_t this_sector, int *len)
{
sector_t first_bad;
int bad_sectors;
/* no bad block overlap */
if (!is_badblock(rdev, this_sector, *len, &first_bad, &bad_sectors))
return *len;
/*
* bad block range starts offset into our range so we can return the
* number of sectors before the bad blocks start.
*/
if (first_bad > this_sector)
return first_bad - this_sector;
/* read range is fully consumed by bad blocks. */
if (this_sector + *len <= first_bad + bad_sectors)
return 0;
/*
* final case, bad block range starts before or at the start of our
* range but does not cover our entire range so we still return 0 but
* update the length with the number of sectors before we get to the
* good ones.
*/
*len = first_bad + bad_sectors - this_sector;
return 0;
}