btrfs: use super write guard in sb_start_write()

Link: https://patch.msgid.link/20251104-work-guards-v1-4-5108ac78a171@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2025-11-04 13:12:33 +01:00
commit 6e5b78cb17
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