File Locks
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## File Locks

posix_lock_file — Apply a POSIX-style lock to a file
posix_lock_file_wait — Apply a POSIX-style lock to a file
locks_mandatory_area — Check for a conflicting lock
__break_lease — revoke all outstanding leases on file
lease_get_mtime —
generic_setlease — sets a lease on an open file
flock_lock_file_wait — Apply a FLOCK-style lock to a file
vfs_test_lock — test file byte range lock
vfs_lock_file — file byte range lock
posix_unblock_lock — stop waiting for a file lock
vfs_cancel_lock — file byte range unblock lock
lock_may_read — checks that the region is free of locks
lock_may_write — checks that the region is free of locks
locks_mandatory_locked — Check for an active lock
fcntl_getlease — Enquire what lease is currently active
fcntl_setlease — sets a lease on an open file
sys_flock — `flock` system call.

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