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.