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btrfs: zoned: locate superblock position using zone capacity

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sb_write_pointer() returns the write position of next superblock. For READ,
we need a previous location. When the pointer is at the head, the previous
one is the last one of the other zone. Calculate the last one's position
from zone capacity.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2021-08-19 21:19:13 +09:00 committed by David Sterba
parent 5daaf552d1
commit 9658b72ef3
1 changed files with 13 additions and 2 deletions
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15
fs/btrfs/zoned.c
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@ -683,9 +683,20 @@ static int sb_log_location(struct block_device *bdev, struct blk_zone *zones,
reset->wp = reset->start;
}
} else if (ret != -ENOENT) {
/* For READ, we want the precious one */
/*
* For READ, we want the previous one. Move write pointer to
* the end of a zone, if it is at the head of a zone.
*/
u64 zone_end = 0;
if (wp == zones[0].start << SECTOR_SHIFT)
wp = (zones[1].start + zones[1].len) << SECTOR_SHIFT;
zone_end = zones[1].start + zones[1].capacity;
else if (wp == zones[1].start << SECTOR_SHIFT)
zone_end = zones[0].start + zones[0].capacity;
if (zone_end)
wp = ALIGN_DOWN(zone_end << SECTOR_SHIFT,
BTRFS_SUPER_INFO_SIZE);
wp -= BTRFS_SUPER_INFO_SIZE;
}