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Message-Id: <20240712-b4-rst-updates-v3-2-5cf27dac98a7@kernel.org>
Date: Fri, 12 Jul 2024 09:48:37 +0200
From: Johannes Thumshirn <jth@...nel.org>
To: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
David Sterba <dsterba@...e.com>
Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
Qu Wenru <wqu@...e.com>, Filipe Manana <fdmanana@...e.com>,
Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v3 2/3] btrfs: replace stripe extents
From: Johannes Thumshirn <johannes.thumshirn@....com>
Update stripe extents in case a write to an already existing address
incoming.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
fs/btrfs/raid-stripe-tree.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/fs/btrfs/raid-stripe-tree.c b/fs/btrfs/raid-stripe-tree.c
index e6f7a234b8f6..53ca2c1a32ac 100644
--- a/fs/btrfs/raid-stripe-tree.c
+++ b/fs/btrfs/raid-stripe-tree.c
@@ -73,6 +73,36 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
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,
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,
item_size);
+ if (ret == -EEXIST)
+ ret = update_raid_extent_item(trans, &stripe_key, stripe_extent,
+ item_size);
if (ret)
btrfs_abort_transaction(trans, ret);
--
2.43.0
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