btrfs: use READA_FORWARD_ALWAYS for device extent verification

btrfs_verify_dev_extents() iterates through the entire device tree
during mount to verify dev extents against chunks. Since this function
scans the whole tree, READA_FORWARD_ALWAYS is more appropriate than
READA_FORWARD.

While the device tree is typically small (a few hundred KB even for
multi-TB filesystems), using the correct readahead mode for full-tree
iteration is more consistent with the intended usage.

Signed-off-by: robbieko <robbieko@synology.com>
Signed-off-by: jinbaohong <jinbaohong@synology.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
jinbaohong 2026-01-14 01:18:15 +00:00 committed by David Sterba
parent 4681dbcfdc
commit 23d4f616cb

View File

@ -8026,7 +8026,7 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info)
if (!path)
return -ENOMEM;
path->reada = READA_FORWARD;
path->reada = READA_FORWARD_ALWAYS;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
return ret;