POSIX_LOCK_FILE(9)                        The Linux VFS                        POSIX_LOCK_FILE(9)



NAME
       posix_lock_file - Apply a POSIX-style lock to a file

SYNOPSIS
       int posix_lock_file(struct file * filp, struct file_lock * fl,
                           struct file_lock * conflock);

ARGUMENTS
       filp
           The file to apply the lock to

       fl
           The lock to be applied

       conflock
           Place to return a copy of the conflicting lock, if found.

DESCRIPTION
       Add a POSIX style lock to a file. We merge adjacent & overlapping locks whenever possible.
       POSIX locks are sorted by owner task, then by starting address

       Note that if called with an FL_EXISTS argument, the caller may determine whether or not a
       lock was successfully freed by testing the return value for -ENOENT.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                        POSIX_LOCK_FILE(9)