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83e57e4790
fscrypt_initialize() is a "one-time init" function that is called whenever the key is set up for any inode on any filesystem. Make it implement "one-time init" more efficiently by not taking a global mutex in the "already initialized case" and doing fewer pointer dereferences. Link: https://lore.kernel.org/r/20230406181245.36091-1-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>