File System Questions Medium
File system file locking is a mechanism used to control access to files in a file system, ensuring that only one process or user can modify a file at a time. It prevents concurrent access to a file by multiple processes, which could lead to data corruption or inconsistencies.
File locking is essential in multi-user or multi-process environments where multiple entities may attempt to access and modify the same file simultaneously. It helps maintain data integrity and prevents conflicts that may arise when multiple processes try to write to or modify a file concurrently.
There are two types of file locking mechanisms: advisory locking and mandatory locking. Advisory locking allows processes to voluntarily request and release locks on files, while mandatory locking enforces locks on files, preventing any process from accessing a locked file.
In advisory locking, a process can request a lock on a file before performing any modifications. Other processes can check if a file is locked and choose to wait or proceed accordingly. Advisory locking relies on the cooperation of all processes to honor the locks and is commonly used in Unix-like systems.
On the other hand, mandatory locking is a stricter form of file locking where the operating system enforces the locks. When a process locks a file, the operating system prevents any other process from accessing or modifying the locked file until the lock is released. Mandatory locking is typically used in systems where data integrity is critical, such as database management systems.
File system file locking plays a crucial role in ensuring data consistency and preventing conflicts in shared file systems. It allows for controlled access to files, preventing simultaneous modifications that could lead to data corruption or loss.