fs: use xarray for old mount id

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While the ida does use the xarray internally we can use it explicitly
which allows us to increment the unique mount id under the xa lock.
This allows us to remove the atomic as we're now allocating both ids in
one go.

Link: https://lore.kernel.org/r/20241217-erhielten-regung-44bb1604ca8f@brauner
Signed-off-by: Christian Brauner <brauner@kernel.org>

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Christian Brauner 2024-12-17 13:21:55 +01:00

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commit 7f9bfafc5f

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fs/namespace.c

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