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btrfs: implement hole punching for RAID stripe extents

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If the stripe extent we want to delete starts before the range we want to
delete and ends after the range we want to delete we're punching a
hole in the stripe extent:

  |--- RAID Stripe Extent ---|
  | keep |--- drop ---| keep |

This means we need to a) truncate the existing item and b)
create a second item for the remaining range.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2025-01-13 20:31:48 +01:00 committed by David Sterba
parent 7664311904
commit 6aa0e7cc56
2 changed files with 49 additions and 0 deletions
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1
fs/btrfs/ctree.c
View File

@ -3833,6 +3833,7 @@ static noinline int setup_leaf_for_split(struct btrfs_trans_handle *trans,
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
BUG_ON(key.type != BTRFS_EXTENT_DATA_KEY &&
key.type != BTRFS_RAID_STRIPE_KEY &&
key.type != BTRFS_EXTENT_CSUM_KEY);
if (btrfs_leaf_free_space(leaf) >= ins_len)

48
fs/btrfs/raid-stripe-tree.c
View File

@ -140,6 +140,54 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
trace_btrfs_raid_extent_delete(fs_info, start, end,
found_start, found_end);
/*
* The stripe extent starts before the range we want to delete
* and ends after the range we want to delete, i.e. we're
* punching a hole in the stripe extent:
*
* |--- RAID Stripe Extent ---|
* | keep |--- drop ---| keep |
*
* This means we need to a) truncate the existing item and b)
* create a second item for the remaining range.
*/
if (found_start < start && found_end > end) {
size_t item_size;
u64 diff_start = start - found_start;
u64 diff_end = found_end - end;
struct btrfs_stripe_extent *extent;
struct btrfs_key newkey = {
.objectid = end,
.type = BTRFS_RAID_STRIPE_KEY,
.offset = diff_end,
};
/* The "right" item. */
ret = btrfs_duplicate_item(trans, stripe_root, path, &newkey);
if (ret)
break;
item_size = btrfs_item_size(leaf, path->slots[0]);
extent = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_stripe_extent);
for (int i = 0; i < btrfs_num_raid_stripes(item_size); i++) {
struct btrfs_raid_stride *stride = &extent->strides[i];
u64 phys;
phys = btrfs_raid_stride_physical(leaf, stride);
phys += diff_start + length;
btrfs_set_raid_stride_physical(leaf, stride, phys);
}
/* The "left" item. */
path->slots[0]--;
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
btrfs_partially_delete_raid_extent(trans, path, &key,
diff_start, 0);
break;
}
/*
* The stripe extent starts before the range we want to delete:
*