fs: add fastpath for dissolve_on_fput()

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Instead of acquiring the namespace semaphore and the mount lock
everytime we close a file with FMODE_NEED_UNMOUNT set add a fastpath
that checks whether we need to at all. Most of the time the caller will
have attached the mount to the filesystem hierarchy and there's nothing
to do.

Link: https://lore.kernel.org/r/20250221-brauner-open_tree-v1-4-dbcfcb98c676@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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Christian Brauner 2025-02-21 14:13:03 +01:00

parent 043bc81efb

commit b73ec10a45

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1 changed files with 47 additions and 12 deletions

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fs/namespace.c

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