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btrfs: zoned: reset zones of unused block groups

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We must reset the zones of a deleted unused block group to rewind the
zones' write pointers to the zones' start.

To do this, we can use the DISCARD_SYNC code to do the reset when the
filesystem is running on zoned devices.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota
2021-02-04 19:21:56 +09:00
committed by David Sterba
parent 011b41bffa
commit dcba6e48b5
3 changed files with 33 additions and 7 deletions
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17
fs/btrfs/extent-tree.c
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@@ -1298,6 +1298,9 @@ int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
stripe = bbio->stripes;
for (i = 0; i < bbio->num_stripes; i++, stripe++) {
struct btrfs_device *dev = stripe->dev;
u64 physical = stripe->physical;
u64 length = stripe->length;
u64 bytes;
struct request_queue *req_q;
@@ -1305,14 +1308,18 @@ int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
ASSERT(btrfs_test_opt(fs_info, DEGRADED));
continue;
}
req_q = bdev_get_queue(stripe->dev->bdev);
if (!blk_queue_discard(req_q))
/* Zone reset on zoned filesystems */
if (btrfs_can_zone_reset(dev, physical, length))
ret = btrfs_reset_device_zone(dev, physical,
length, &bytes);
else if (blk_queue_discard(req_q))
ret = btrfs_issue_discard(dev->bdev, physical,
length, &bytes);
else
continue;
ret = btrfs_issue_discard(stripe->dev->bdev,
stripe->physical,
stripe->length,
&bytes);
if (!ret) {
discarded_bytes += bytes;
} else if (ret != -EOPNOTSUPP) {