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Kernel: Implement flock downgrading
This commit makes it possible for a process to downgrade a file lock it holds from a write (exclusive) lock to a read (shared) lock. For this, the process must point to the exact range of the flock, and must be the owner of the lock.
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9b425b860c
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2 changed files with 39 additions and 19 deletions
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@ -104,7 +104,7 @@ public:
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ErrorOr<NonnullLockRefPtr<FIFO>> fifo();
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bool can_apply_flock(flock const&) const;
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bool can_apply_flock(flock const&, Optional<OpenFileDescription const&> = {}) const;
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ErrorOr<void> apply_flock(Process const&, OpenFileDescription const&, Userspace<flock const*>, ShouldBlock);
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ErrorOr<void> get_flock(OpenFileDescription const&, Userspace<flock*>) const;
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void remove_flocks_for_description(OpenFileDescription const&);
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