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btrfs: update stripe extents for existing logical addresses

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Update a stripe extent in case of an already existing logical address,
but with different physical addresses and/or device id instead of
bailing out with EEXIST.

This can happen i.e. in case of a device replace operation, where data
extents get rewritten to a new disk.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2024-07-08 13:24:08 +02:00 committed by David Sterba
parent da3ea35007
commit 8c4cba2adb
1 changed files with 33 additions and 0 deletions
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33
fs/btrfs/raid-stripe-tree.c
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@ -73,6 +73,36 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
return ret; return ret;
} }
static int update_raid_extent_item(struct btrfs_trans_handle *trans,
struct btrfs_key *key,
struct btrfs_stripe_extent *stripe_extent,
const size_t item_size)
{
struct btrfs_path *path;
struct extent_buffer *leaf;
int ret;
int slot;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, trans->fs_info->stripe_root, key, path,
0, 1);
if (ret)
return (ret == 1 ? ret : -EINVAL);
leaf = path->nodes[0];
slot = path->slots[0];
write_extent_buffer(leaf, stripe_extent, btrfs_item_ptr_offset(leaf, slot),
item_size);
btrfs_mark_buffer_dirty(trans, leaf);
btrfs_free_path(path);
return ret;
}
static int btrfs_insert_one_raid_extent(struct btrfs_trans_handle *trans, static int btrfs_insert_one_raid_extent(struct btrfs_trans_handle *trans,
struct btrfs_io_context *bioc) struct btrfs_io_context *bioc)
{ {
@ -112,6 +142,9 @@ static int btrfs_insert_one_raid_extent(struct btrfs_trans_handle *trans,
ret = btrfs_insert_item(trans, stripe_root, &stripe_key, stripe_extent, ret = btrfs_insert_item(trans, stripe_root, &stripe_key, stripe_extent,
item_size); item_size);
if (ret == -EEXIST)
ret = update_raid_extent_item(trans, &stripe_key, stripe_extent,
item_size);
if (ret) if (ret)
btrfs_abort_transaction(trans, ret); btrfs_abort_transaction(trans, ret);